Update Linux to v5.10.109
Sourced from [1]
[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.10.109.tar.xz
Change-Id: I19bca9fc6762d4e63bcf3e4cba88bbe560d9c76c
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/drivers/most/Kconfig b/drivers/most/Kconfig
new file mode 100644
index 0000000..ebfe84e
--- /dev/null
+++ b/drivers/most/Kconfig
@@ -0,0 +1,35 @@
+# SPDX-License-Identifier: GPL-2.0
+menuconfig MOST
+ tristate "MOST support"
+ depends on HAS_DMA && CONFIGFS_FS
+ default n
+ help
+ Say Y here if you want to enable MOST support.
+ This driver needs at least one additional component to enable the
+ desired access from userspace (e.g. character devices) and one that
+ matches the network controller's hardware interface (e.g. USB).
+
+ To compile this driver as a module, choose M here: the
+ module will be called most_core.
+
+ If in doubt, say N here.
+
+if MOST
+config MOST_USB_HDM
+ tristate "USB"
+ depends on USB
+ help
+ Say Y here if you want to connect via USB to network transceiver.
+
+ To compile this driver as a module, choose M here: the
+ module will be called most_usb.
+
+config MOST_CDEV
+ tristate "Cdev"
+
+ help
+ Say Y here if you want to commumicate via character devices.
+
+ To compile this driver as a module, choose M here: the
+ module will be called most_cdev.
+endif
diff --git a/drivers/most/Makefile b/drivers/most/Makefile
new file mode 100644
index 0000000..8b53ca4
--- /dev/null
+++ b/drivers/most/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_MOST) += most_core.o
+most_core-y := core.o \
+ configfs.o
+
+obj-$(CONFIG_MOST_USB_HDM) += most_usb.o
+obj-$(CONFIG_MOST_CDEV) += most_cdev.o
diff --git a/drivers/most/configfs.c b/drivers/most/configfs.c
new file mode 100644
index 0000000..27b0c92
--- /dev/null
+++ b/drivers/most/configfs.c
@@ -0,0 +1,724 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * configfs.c - Implementation of configfs interface to the driver stack
+ *
+ * Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/configfs.h>
+#include <linux/most.h>
+
+#define MAX_STRING_SIZE 80
+
+struct mdev_link {
+ struct config_item item;
+ struct list_head list;
+ bool create_link;
+ bool destroy_link;
+ u16 num_buffers;
+ u16 buffer_size;
+ u16 subbuffer_size;
+ u16 packets_per_xact;
+ u16 dbr_size;
+ char datatype[MAX_STRING_SIZE];
+ char direction[MAX_STRING_SIZE];
+ char name[MAX_STRING_SIZE];
+ char device[MAX_STRING_SIZE];
+ char channel[MAX_STRING_SIZE];
+ char comp[MAX_STRING_SIZE];
+ char comp_params[MAX_STRING_SIZE];
+};
+
+static struct list_head mdev_link_list;
+
+static int set_cfg_buffer_size(struct mdev_link *link)
+{
+ return most_set_cfg_buffer_size(link->device, link->channel,
+ link->buffer_size);
+}
+
+static int set_cfg_subbuffer_size(struct mdev_link *link)
+{
+ return most_set_cfg_subbuffer_size(link->device, link->channel,
+ link->subbuffer_size);
+}
+
+static int set_cfg_dbr_size(struct mdev_link *link)
+{
+ return most_set_cfg_dbr_size(link->device, link->channel,
+ link->dbr_size);
+}
+
+static int set_cfg_num_buffers(struct mdev_link *link)
+{
+ return most_set_cfg_num_buffers(link->device, link->channel,
+ link->num_buffers);
+}
+
+static int set_cfg_packets_xact(struct mdev_link *link)
+{
+ return most_set_cfg_packets_xact(link->device, link->channel,
+ link->packets_per_xact);
+}
+
+static int set_cfg_direction(struct mdev_link *link)
+{
+ return most_set_cfg_direction(link->device, link->channel,
+ link->direction);
+}
+
+static int set_cfg_datatype(struct mdev_link *link)
+{
+ return most_set_cfg_datatype(link->device, link->channel,
+ link->datatype);
+}
+
+static int (*set_config_val[])(struct mdev_link *link) = {
+ set_cfg_buffer_size,
+ set_cfg_subbuffer_size,
+ set_cfg_dbr_size,
+ set_cfg_num_buffers,
+ set_cfg_packets_xact,
+ set_cfg_direction,
+ set_cfg_datatype,
+};
+
+static struct mdev_link *to_mdev_link(struct config_item *item)
+{
+ return container_of(item, struct mdev_link, item);
+}
+
+static int set_config_and_add_link(struct mdev_link *mdev_link)
+{
+ int i;
+ int ret;
+
+ for (i = 0; i < ARRAY_SIZE(set_config_val); i++) {
+ ret = set_config_val[i](mdev_link);
+ if (ret < 0 && ret != -ENODEV) {
+ pr_err("Config failed\n");
+ return ret;
+ }
+ }
+
+ return most_add_link(mdev_link->device, mdev_link->channel,
+ mdev_link->comp, mdev_link->name,
+ mdev_link->comp_params);
+}
+
+static ssize_t mdev_link_create_link_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+ bool tmp;
+ int ret;
+
+ ret = kstrtobool(page, &tmp);
+ if (ret)
+ return ret;
+ if (!tmp)
+ return count;
+ ret = set_config_and_add_link(mdev_link);
+ if (ret && ret != -ENODEV)
+ return ret;
+ list_add_tail(&mdev_link->list, &mdev_link_list);
+ mdev_link->create_link = tmp;
+ mdev_link->destroy_link = false;
+
+ return count;
+}
+
+static ssize_t mdev_link_destroy_link_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+ bool tmp;
+ int ret;
+
+ ret = kstrtobool(page, &tmp);
+ if (ret)
+ return ret;
+ if (!tmp)
+ return count;
+
+ ret = most_remove_link(mdev_link->device, mdev_link->channel,
+ mdev_link->comp);
+ if (ret)
+ return ret;
+ if (!list_empty(&mdev_link_list))
+ list_del(&mdev_link->list);
+
+ mdev_link->destroy_link = tmp;
+
+ return count;
+}
+
+static ssize_t mdev_link_direction_show(struct config_item *item, char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->direction);
+}
+
+static ssize_t mdev_link_direction_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+
+ if (!sysfs_streq(page, "dir_rx") && !sysfs_streq(page, "rx") &&
+ !sysfs_streq(page, "dir_tx") && !sysfs_streq(page, "tx"))
+ return -EINVAL;
+ strcpy(mdev_link->direction, page);
+ strim(mdev_link->direction);
+ return count;
+}
+
+static ssize_t mdev_link_datatype_show(struct config_item *item, char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->datatype);
+}
+
+static ssize_t mdev_link_datatype_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+
+ if (!sysfs_streq(page, "control") && !sysfs_streq(page, "async") &&
+ !sysfs_streq(page, "sync") && !sysfs_streq(page, "isoc") &&
+ !sysfs_streq(page, "isoc_avp"))
+ return -EINVAL;
+ strcpy(mdev_link->datatype, page);
+ strim(mdev_link->datatype);
+ return count;
+}
+
+static ssize_t mdev_link_device_show(struct config_item *item, char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->device);
+}
+
+static ssize_t mdev_link_device_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+
+ strlcpy(mdev_link->device, page, sizeof(mdev_link->device));
+ strim(mdev_link->device);
+ return count;
+}
+
+static ssize_t mdev_link_channel_show(struct config_item *item, char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->channel);
+}
+
+static ssize_t mdev_link_channel_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+
+ strlcpy(mdev_link->channel, page, sizeof(mdev_link->channel));
+ strim(mdev_link->channel);
+ return count;
+}
+
+static ssize_t mdev_link_comp_show(struct config_item *item, char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->comp);
+}
+
+static ssize_t mdev_link_comp_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+
+ strlcpy(mdev_link->comp, page, sizeof(mdev_link->comp));
+ strim(mdev_link->comp);
+ return count;
+}
+
+static ssize_t mdev_link_comp_params_show(struct config_item *item, char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%s\n",
+ to_mdev_link(item)->comp_params);
+}
+
+static ssize_t mdev_link_comp_params_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+
+ strlcpy(mdev_link->comp_params, page, sizeof(mdev_link->comp_params));
+ strim(mdev_link->comp_params);
+ return count;
+}
+
+static ssize_t mdev_link_num_buffers_show(struct config_item *item, char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%d\n",
+ to_mdev_link(item)->num_buffers);
+}
+
+static ssize_t mdev_link_num_buffers_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+ int ret;
+
+ ret = kstrtou16(page, 0, &mdev_link->num_buffers);
+ if (ret)
+ return ret;
+ return count;
+}
+
+static ssize_t mdev_link_buffer_size_show(struct config_item *item, char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%d\n",
+ to_mdev_link(item)->buffer_size);
+}
+
+static ssize_t mdev_link_buffer_size_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+ int ret;
+
+ ret = kstrtou16(page, 0, &mdev_link->buffer_size);
+ if (ret)
+ return ret;
+ return count;
+}
+
+static ssize_t mdev_link_subbuffer_size_show(struct config_item *item,
+ char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%d\n",
+ to_mdev_link(item)->subbuffer_size);
+}
+
+static ssize_t mdev_link_subbuffer_size_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+ int ret;
+
+ ret = kstrtou16(page, 0, &mdev_link->subbuffer_size);
+ if (ret)
+ return ret;
+ return count;
+}
+
+static ssize_t mdev_link_packets_per_xact_show(struct config_item *item,
+ char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%d\n",
+ to_mdev_link(item)->packets_per_xact);
+}
+
+static ssize_t mdev_link_packets_per_xact_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+ int ret;
+
+ ret = kstrtou16(page, 0, &mdev_link->packets_per_xact);
+ if (ret)
+ return ret;
+ return count;
+}
+
+static ssize_t mdev_link_dbr_size_show(struct config_item *item, char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%d\n", to_mdev_link(item)->dbr_size);
+}
+
+static ssize_t mdev_link_dbr_size_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+ int ret;
+
+ ret = kstrtou16(page, 0, &mdev_link->dbr_size);
+ if (ret)
+ return ret;
+ return count;
+}
+
+CONFIGFS_ATTR_WO(mdev_link_, create_link);
+CONFIGFS_ATTR_WO(mdev_link_, destroy_link);
+CONFIGFS_ATTR(mdev_link_, device);
+CONFIGFS_ATTR(mdev_link_, channel);
+CONFIGFS_ATTR(mdev_link_, comp);
+CONFIGFS_ATTR(mdev_link_, comp_params);
+CONFIGFS_ATTR(mdev_link_, num_buffers);
+CONFIGFS_ATTR(mdev_link_, buffer_size);
+CONFIGFS_ATTR(mdev_link_, subbuffer_size);
+CONFIGFS_ATTR(mdev_link_, packets_per_xact);
+CONFIGFS_ATTR(mdev_link_, datatype);
+CONFIGFS_ATTR(mdev_link_, direction);
+CONFIGFS_ATTR(mdev_link_, dbr_size);
+
+static struct configfs_attribute *mdev_link_attrs[] = {
+ &mdev_link_attr_create_link,
+ &mdev_link_attr_destroy_link,
+ &mdev_link_attr_device,
+ &mdev_link_attr_channel,
+ &mdev_link_attr_comp,
+ &mdev_link_attr_comp_params,
+ &mdev_link_attr_num_buffers,
+ &mdev_link_attr_buffer_size,
+ &mdev_link_attr_subbuffer_size,
+ &mdev_link_attr_packets_per_xact,
+ &mdev_link_attr_datatype,
+ &mdev_link_attr_direction,
+ &mdev_link_attr_dbr_size,
+ NULL,
+};
+
+static void mdev_link_release(struct config_item *item)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+ int ret;
+
+ if (mdev_link->destroy_link)
+ goto free_item;
+
+ ret = most_remove_link(mdev_link->device, mdev_link->channel,
+ mdev_link->comp);
+ if (ret) {
+ pr_err("Removing link failed.\n");
+ goto free_item;
+ }
+
+ if (!list_empty(&mdev_link_list))
+ list_del(&mdev_link->list);
+
+free_item:
+ kfree(to_mdev_link(item));
+}
+
+static struct configfs_item_operations mdev_link_item_ops = {
+ .release = mdev_link_release,
+};
+
+static const struct config_item_type mdev_link_type = {
+ .ct_item_ops = &mdev_link_item_ops,
+ .ct_attrs = mdev_link_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
+struct most_common {
+ struct config_group group;
+ struct module *mod;
+ struct configfs_subsystem subsys;
+};
+
+static struct most_common *to_most_common(struct configfs_subsystem *subsys)
+{
+ return container_of(subsys, struct most_common, subsys);
+}
+
+static struct config_item *most_common_make_item(struct config_group *group,
+ const char *name)
+{
+ struct mdev_link *mdev_link;
+ struct most_common *mc = to_most_common(group->cg_subsys);
+
+ mdev_link = kzalloc(sizeof(*mdev_link), GFP_KERNEL);
+ if (!mdev_link)
+ return ERR_PTR(-ENOMEM);
+
+ if (!try_module_get(mc->mod)) {
+ kfree(mdev_link);
+ return ERR_PTR(-ENOLCK);
+ }
+ config_item_init_type_name(&mdev_link->item, name,
+ &mdev_link_type);
+
+ if (!strcmp(group->cg_item.ci_namebuf, "most_cdev"))
+ strcpy(mdev_link->comp, "cdev");
+ else if (!strcmp(group->cg_item.ci_namebuf, "most_net"))
+ strcpy(mdev_link->comp, "net");
+ else if (!strcmp(group->cg_item.ci_namebuf, "most_video"))
+ strcpy(mdev_link->comp, "video");
+ strcpy(mdev_link->name, name);
+ return &mdev_link->item;
+}
+
+static void most_common_release(struct config_item *item)
+{
+ struct config_group *group = to_config_group(item);
+
+ kfree(to_most_common(group->cg_subsys));
+}
+
+static struct configfs_item_operations most_common_item_ops = {
+ .release = most_common_release,
+};
+
+static void most_common_disconnect(struct config_group *group,
+ struct config_item *item)
+{
+ struct most_common *mc = to_most_common(group->cg_subsys);
+
+ module_put(mc->mod);
+}
+
+static struct configfs_group_operations most_common_group_ops = {
+ .make_item = most_common_make_item,
+ .disconnect_notify = most_common_disconnect,
+};
+
+static const struct config_item_type most_common_type = {
+ .ct_item_ops = &most_common_item_ops,
+ .ct_group_ops = &most_common_group_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct most_common most_cdev = {
+ .subsys = {
+ .su_group = {
+ .cg_item = {
+ .ci_namebuf = "most_cdev",
+ .ci_type = &most_common_type,
+ },
+ },
+ },
+};
+
+static struct most_common most_net = {
+ .subsys = {
+ .su_group = {
+ .cg_item = {
+ .ci_namebuf = "most_net",
+ .ci_type = &most_common_type,
+ },
+ },
+ },
+};
+
+static struct most_common most_video = {
+ .subsys = {
+ .su_group = {
+ .cg_item = {
+ .ci_namebuf = "most_video",
+ .ci_type = &most_common_type,
+ },
+ },
+ },
+};
+
+struct most_snd_grp {
+ struct config_group group;
+ bool create_card;
+ struct list_head list;
+};
+
+static struct most_snd_grp *to_most_snd_grp(struct config_item *item)
+{
+ return container_of(to_config_group(item), struct most_snd_grp, group);
+}
+
+static struct config_item *most_snd_grp_make_item(struct config_group *group,
+ const char *name)
+{
+ struct mdev_link *mdev_link;
+
+ mdev_link = kzalloc(sizeof(*mdev_link), GFP_KERNEL);
+ if (!mdev_link)
+ return ERR_PTR(-ENOMEM);
+
+ config_item_init_type_name(&mdev_link->item, name, &mdev_link_type);
+ mdev_link->create_link = false;
+ strcpy(mdev_link->name, name);
+ strcpy(mdev_link->comp, "sound");
+ return &mdev_link->item;
+}
+
+static ssize_t most_snd_grp_create_card_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct most_snd_grp *snd_grp = to_most_snd_grp(item);
+ int ret;
+ bool tmp;
+
+ ret = kstrtobool(page, &tmp);
+ if (ret)
+ return ret;
+ if (tmp) {
+ ret = most_cfg_complete("sound");
+ if (ret)
+ return ret;
+ }
+ snd_grp->create_card = tmp;
+ return count;
+}
+
+CONFIGFS_ATTR_WO(most_snd_grp_, create_card);
+
+static struct configfs_attribute *most_snd_grp_attrs[] = {
+ &most_snd_grp_attr_create_card,
+ NULL,
+};
+
+static void most_snd_grp_release(struct config_item *item)
+{
+ struct most_snd_grp *group = to_most_snd_grp(item);
+
+ list_del(&group->list);
+ kfree(group);
+}
+
+static struct configfs_item_operations most_snd_grp_item_ops = {
+ .release = most_snd_grp_release,
+};
+
+static struct configfs_group_operations most_snd_grp_group_ops = {
+ .make_item = most_snd_grp_make_item,
+};
+
+static const struct config_item_type most_snd_grp_type = {
+ .ct_item_ops = &most_snd_grp_item_ops,
+ .ct_group_ops = &most_snd_grp_group_ops,
+ .ct_attrs = most_snd_grp_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
+struct most_sound {
+ struct configfs_subsystem subsys;
+ struct list_head soundcard_list;
+ struct module *mod;
+};
+
+static struct config_group *most_sound_make_group(struct config_group *group,
+ const char *name)
+{
+ struct most_snd_grp *most;
+ struct most_sound *ms = container_of(group->cg_subsys,
+ struct most_sound, subsys);
+
+ list_for_each_entry(most, &ms->soundcard_list, list) {
+ if (!most->create_card) {
+ pr_info("adapter configuration still in progress.\n");
+ return ERR_PTR(-EPROTO);
+ }
+ }
+ if (!try_module_get(ms->mod))
+ return ERR_PTR(-ENOLCK);
+ most = kzalloc(sizeof(*most), GFP_KERNEL);
+ if (!most) {
+ module_put(ms->mod);
+ return ERR_PTR(-ENOMEM);
+ }
+ config_group_init_type_name(&most->group, name, &most_snd_grp_type);
+ list_add_tail(&most->list, &ms->soundcard_list);
+ return &most->group;
+}
+
+static void most_sound_disconnect(struct config_group *group,
+ struct config_item *item)
+{
+ struct most_sound *ms = container_of(group->cg_subsys,
+ struct most_sound, subsys);
+ module_put(ms->mod);
+}
+
+static struct configfs_group_operations most_sound_group_ops = {
+ .make_group = most_sound_make_group,
+ .disconnect_notify = most_sound_disconnect,
+};
+
+static const struct config_item_type most_sound_type = {
+ .ct_group_ops = &most_sound_group_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct most_sound most_sound_subsys = {
+ .subsys = {
+ .su_group = {
+ .cg_item = {
+ .ci_namebuf = "most_sound",
+ .ci_type = &most_sound_type,
+ },
+ },
+ },
+};
+
+int most_register_configfs_subsys(struct most_component *c)
+{
+ int ret;
+
+ if (!strcmp(c->name, "cdev")) {
+ most_cdev.mod = c->mod;
+ ret = configfs_register_subsystem(&most_cdev.subsys);
+ } else if (!strcmp(c->name, "net")) {
+ most_net.mod = c->mod;
+ ret = configfs_register_subsystem(&most_net.subsys);
+ } else if (!strcmp(c->name, "video")) {
+ most_video.mod = c->mod;
+ ret = configfs_register_subsystem(&most_video.subsys);
+ } else if (!strcmp(c->name, "sound")) {
+ most_sound_subsys.mod = c->mod;
+ ret = configfs_register_subsystem(&most_sound_subsys.subsys);
+ } else {
+ return -ENODEV;
+ }
+
+ if (ret) {
+ pr_err("Error %d while registering subsystem %s\n",
+ ret, c->name);
+ }
+ return ret;
+}
+EXPORT_SYMBOL_GPL(most_register_configfs_subsys);
+
+void most_interface_register_notify(const char *mdev)
+{
+ bool register_snd_card = false;
+ struct mdev_link *mdev_link;
+
+ list_for_each_entry(mdev_link, &mdev_link_list, list) {
+ if (!strcmp(mdev_link->device, mdev)) {
+ set_config_and_add_link(mdev_link);
+ if (!strcmp(mdev_link->comp, "sound"))
+ register_snd_card = true;
+ }
+ }
+ if (register_snd_card)
+ most_cfg_complete("sound");
+}
+
+void most_deregister_configfs_subsys(struct most_component *c)
+{
+ if (!strcmp(c->name, "cdev"))
+ configfs_unregister_subsystem(&most_cdev.subsys);
+ else if (!strcmp(c->name, "net"))
+ configfs_unregister_subsystem(&most_net.subsys);
+ else if (!strcmp(c->name, "video"))
+ configfs_unregister_subsystem(&most_video.subsys);
+ else if (!strcmp(c->name, "sound"))
+ configfs_unregister_subsystem(&most_sound_subsys.subsys);
+}
+EXPORT_SYMBOL_GPL(most_deregister_configfs_subsys);
+
+int __init configfs_init(void)
+{
+ config_group_init(&most_cdev.subsys.su_group);
+ mutex_init(&most_cdev.subsys.su_mutex);
+
+ config_group_init(&most_net.subsys.su_group);
+ mutex_init(&most_net.subsys.su_mutex);
+
+ config_group_init(&most_video.subsys.su_group);
+ mutex_init(&most_video.subsys.su_mutex);
+
+ config_group_init(&most_sound_subsys.subsys.su_group);
+ mutex_init(&most_sound_subsys.subsys.su_mutex);
+
+ INIT_LIST_HEAD(&most_sound_subsys.soundcard_list);
+ INIT_LIST_HEAD(&mdev_link_list);
+
+ return 0;
+}
diff --git a/drivers/most/core.c b/drivers/most/core.c
new file mode 100644
index 0000000..353ab27
--- /dev/null
+++ b/drivers/most/core.c
@@ -0,0 +1,1488 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * core.c - Implementation of core module of MOST Linux driver stack
+ *
+ * Copyright (C) 2013-2020 Microchip Technology Germany II GmbH & Co. KG
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/poll.h>
+#include <linux/wait.h>
+#include <linux/kobject.h>
+#include <linux/mutex.h>
+#include <linux/completion.h>
+#include <linux/sysfs.h>
+#include <linux/kthread.h>
+#include <linux/dma-mapping.h>
+#include <linux/idr.h>
+#include <linux/most.h>
+
+#define MAX_CHANNELS 64
+#define STRING_SIZE 80
+
+static struct ida mdev_id;
+static int dummy_num_buffers;
+static struct list_head comp_list;
+
+struct pipe {
+ struct most_component *comp;
+ int refs;
+ int num_buffers;
+};
+
+struct most_channel {
+ struct device dev;
+ struct completion cleanup;
+ atomic_t mbo_ref;
+ atomic_t mbo_nq_level;
+ u16 channel_id;
+ char name[STRING_SIZE];
+ bool is_poisoned;
+ struct mutex start_mutex; /* channel activation synchronization */
+ struct mutex nq_mutex; /* nq thread synchronization */
+ int is_starving;
+ struct most_interface *iface;
+ struct most_channel_config cfg;
+ bool keep_mbo;
+ bool enqueue_halt;
+ struct list_head fifo;
+ spinlock_t fifo_lock; /* fifo access synchronization */
+ struct list_head halt_fifo;
+ struct list_head list;
+ struct pipe pipe0;
+ struct pipe pipe1;
+ struct list_head trash_fifo;
+ struct task_struct *hdm_enqueue_task;
+ wait_queue_head_t hdm_fifo_wq;
+
+};
+
+#define to_channel(d) container_of(d, struct most_channel, dev)
+
+struct interface_private {
+ int dev_id;
+ char name[STRING_SIZE];
+ struct most_channel *channel[MAX_CHANNELS];
+ struct list_head channel_list;
+};
+
+static const struct {
+ int most_ch_data_type;
+ const char *name;
+} ch_data_type[] = {
+ { MOST_CH_CONTROL, "control" },
+ { MOST_CH_ASYNC, "async" },
+ { MOST_CH_SYNC, "sync" },
+ { MOST_CH_ISOC, "isoc"},
+ { MOST_CH_ISOC, "isoc_avp"},
+};
+
+/**
+ * list_pop_mbo - retrieves the first MBO of the list and removes it
+ * @ptr: the list head to grab the MBO from.
+ */
+#define list_pop_mbo(ptr) \
+({ \
+ struct mbo *_mbo = list_first_entry(ptr, struct mbo, list); \
+ list_del(&_mbo->list); \
+ _mbo; \
+})
+
+/**
+ * most_free_mbo_coherent - free an MBO and its coherent buffer
+ * @mbo: most buffer
+ */
+static void most_free_mbo_coherent(struct mbo *mbo)
+{
+ struct most_channel *c = mbo->context;
+ u16 const coherent_buf_size = c->cfg.buffer_size + c->cfg.extra_len;
+
+ if (c->iface->dma_free)
+ c->iface->dma_free(mbo, coherent_buf_size);
+ else
+ kfree(mbo->virt_address);
+ kfree(mbo);
+ if (atomic_sub_and_test(1, &c->mbo_ref))
+ complete(&c->cleanup);
+}
+
+/**
+ * flush_channel_fifos - clear the channel fifos
+ * @c: pointer to channel object
+ */
+static void flush_channel_fifos(struct most_channel *c)
+{
+ unsigned long flags, hf_flags;
+ struct mbo *mbo, *tmp;
+
+ if (list_empty(&c->fifo) && list_empty(&c->halt_fifo))
+ return;
+
+ spin_lock_irqsave(&c->fifo_lock, flags);
+ list_for_each_entry_safe(mbo, tmp, &c->fifo, list) {
+ list_del(&mbo->list);
+ spin_unlock_irqrestore(&c->fifo_lock, flags);
+ most_free_mbo_coherent(mbo);
+ spin_lock_irqsave(&c->fifo_lock, flags);
+ }
+ spin_unlock_irqrestore(&c->fifo_lock, flags);
+
+ spin_lock_irqsave(&c->fifo_lock, hf_flags);
+ list_for_each_entry_safe(mbo, tmp, &c->halt_fifo, list) {
+ list_del(&mbo->list);
+ spin_unlock_irqrestore(&c->fifo_lock, hf_flags);
+ most_free_mbo_coherent(mbo);
+ spin_lock_irqsave(&c->fifo_lock, hf_flags);
+ }
+ spin_unlock_irqrestore(&c->fifo_lock, hf_flags);
+
+ if (unlikely((!list_empty(&c->fifo) || !list_empty(&c->halt_fifo))))
+ dev_warn(&c->dev, "Channel or trash fifo not empty\n");
+}
+
+/**
+ * flush_trash_fifo - clear the trash fifo
+ * @c: pointer to channel object
+ */
+static int flush_trash_fifo(struct most_channel *c)
+{
+ struct mbo *mbo, *tmp;
+ unsigned long flags;
+
+ spin_lock_irqsave(&c->fifo_lock, flags);
+ list_for_each_entry_safe(mbo, tmp, &c->trash_fifo, list) {
+ list_del(&mbo->list);
+ spin_unlock_irqrestore(&c->fifo_lock, flags);
+ most_free_mbo_coherent(mbo);
+ spin_lock_irqsave(&c->fifo_lock, flags);
+ }
+ spin_unlock_irqrestore(&c->fifo_lock, flags);
+ return 0;
+}
+
+static ssize_t available_directions_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+ unsigned int i = c->channel_id;
+
+ strcpy(buf, "");
+ if (c->iface->channel_vector[i].direction & MOST_CH_RX)
+ strcat(buf, "rx ");
+ if (c->iface->channel_vector[i].direction & MOST_CH_TX)
+ strcat(buf, "tx ");
+ strcat(buf, "\n");
+ return strlen(buf);
+}
+
+static ssize_t available_datatypes_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+ unsigned int i = c->channel_id;
+
+ strcpy(buf, "");
+ if (c->iface->channel_vector[i].data_type & MOST_CH_CONTROL)
+ strcat(buf, "control ");
+ if (c->iface->channel_vector[i].data_type & MOST_CH_ASYNC)
+ strcat(buf, "async ");
+ if (c->iface->channel_vector[i].data_type & MOST_CH_SYNC)
+ strcat(buf, "sync ");
+ if (c->iface->channel_vector[i].data_type & MOST_CH_ISOC)
+ strcat(buf, "isoc ");
+ strcat(buf, "\n");
+ return strlen(buf);
+}
+
+static ssize_t number_of_packet_buffers_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+ unsigned int i = c->channel_id;
+
+ return snprintf(buf, PAGE_SIZE, "%d\n",
+ c->iface->channel_vector[i].num_buffers_packet);
+}
+
+static ssize_t number_of_stream_buffers_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+ unsigned int i = c->channel_id;
+
+ return snprintf(buf, PAGE_SIZE, "%d\n",
+ c->iface->channel_vector[i].num_buffers_streaming);
+}
+
+static ssize_t size_of_packet_buffer_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+ unsigned int i = c->channel_id;
+
+ return snprintf(buf, PAGE_SIZE, "%d\n",
+ c->iface->channel_vector[i].buffer_size_packet);
+}
+
+static ssize_t size_of_stream_buffer_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+ unsigned int i = c->channel_id;
+
+ return snprintf(buf, PAGE_SIZE, "%d\n",
+ c->iface->channel_vector[i].buffer_size_streaming);
+}
+
+static ssize_t channel_starving_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", c->is_starving);
+}
+
+static ssize_t set_number_of_buffers_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.num_buffers);
+}
+
+static ssize_t set_buffer_size_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.buffer_size);
+}
+
+static ssize_t set_direction_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+
+ if (c->cfg.direction & MOST_CH_TX)
+ return snprintf(buf, PAGE_SIZE, "tx\n");
+ else if (c->cfg.direction & MOST_CH_RX)
+ return snprintf(buf, PAGE_SIZE, "rx\n");
+ return snprintf(buf, PAGE_SIZE, "unconfigured\n");
+}
+
+static ssize_t set_datatype_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int i;
+ struct most_channel *c = to_channel(dev);
+
+ for (i = 0; i < ARRAY_SIZE(ch_data_type); i++) {
+ if (c->cfg.data_type & ch_data_type[i].most_ch_data_type)
+ return snprintf(buf, PAGE_SIZE, "%s",
+ ch_data_type[i].name);
+ }
+ return snprintf(buf, PAGE_SIZE, "unconfigured\n");
+}
+
+static ssize_t set_subbuffer_size_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.subbuffer_size);
+}
+
+static ssize_t set_packets_per_xact_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.packets_per_xact);
+}
+
+static ssize_t set_dbr_size_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.dbr_size);
+}
+
+#define to_dev_attr(a) container_of(a, struct device_attribute, attr)
+static umode_t channel_attr_is_visible(struct kobject *kobj,
+ struct attribute *attr, int index)
+{
+ struct device_attribute *dev_attr = to_dev_attr(attr);
+ struct device *dev = kobj_to_dev(kobj);
+ struct most_channel *c = to_channel(dev);
+
+ if (!strcmp(dev_attr->attr.name, "set_dbr_size") &&
+ (c->iface->interface != ITYPE_MEDIALB_DIM2))
+ return 0;
+ if (!strcmp(dev_attr->attr.name, "set_packets_per_xact") &&
+ (c->iface->interface != ITYPE_USB))
+ return 0;
+
+ return attr->mode;
+}
+
+#define DEV_ATTR(_name) (&dev_attr_##_name.attr)
+
+static DEVICE_ATTR_RO(available_directions);
+static DEVICE_ATTR_RO(available_datatypes);
+static DEVICE_ATTR_RO(number_of_packet_buffers);
+static DEVICE_ATTR_RO(number_of_stream_buffers);
+static DEVICE_ATTR_RO(size_of_stream_buffer);
+static DEVICE_ATTR_RO(size_of_packet_buffer);
+static DEVICE_ATTR_RO(channel_starving);
+static DEVICE_ATTR_RO(set_buffer_size);
+static DEVICE_ATTR_RO(set_number_of_buffers);
+static DEVICE_ATTR_RO(set_direction);
+static DEVICE_ATTR_RO(set_datatype);
+static DEVICE_ATTR_RO(set_subbuffer_size);
+static DEVICE_ATTR_RO(set_packets_per_xact);
+static DEVICE_ATTR_RO(set_dbr_size);
+
+static struct attribute *channel_attrs[] = {
+ DEV_ATTR(available_directions),
+ DEV_ATTR(available_datatypes),
+ DEV_ATTR(number_of_packet_buffers),
+ DEV_ATTR(number_of_stream_buffers),
+ DEV_ATTR(size_of_stream_buffer),
+ DEV_ATTR(size_of_packet_buffer),
+ DEV_ATTR(channel_starving),
+ DEV_ATTR(set_buffer_size),
+ DEV_ATTR(set_number_of_buffers),
+ DEV_ATTR(set_direction),
+ DEV_ATTR(set_datatype),
+ DEV_ATTR(set_subbuffer_size),
+ DEV_ATTR(set_packets_per_xact),
+ DEV_ATTR(set_dbr_size),
+ NULL,
+};
+
+static struct attribute_group channel_attr_group = {
+ .attrs = channel_attrs,
+ .is_visible = channel_attr_is_visible,
+};
+
+static const struct attribute_group *channel_attr_groups[] = {
+ &channel_attr_group,
+ NULL,
+};
+
+static ssize_t description_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_interface *iface = dev_get_drvdata(dev);
+
+ return snprintf(buf, PAGE_SIZE, "%s\n", iface->description);
+}
+
+static ssize_t interface_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_interface *iface = dev_get_drvdata(dev);
+
+ switch (iface->interface) {
+ case ITYPE_LOOPBACK:
+ return snprintf(buf, PAGE_SIZE, "loopback\n");
+ case ITYPE_I2C:
+ return snprintf(buf, PAGE_SIZE, "i2c\n");
+ case ITYPE_I2S:
+ return snprintf(buf, PAGE_SIZE, "i2s\n");
+ case ITYPE_TSI:
+ return snprintf(buf, PAGE_SIZE, "tsi\n");
+ case ITYPE_HBI:
+ return snprintf(buf, PAGE_SIZE, "hbi\n");
+ case ITYPE_MEDIALB_DIM:
+ return snprintf(buf, PAGE_SIZE, "mlb_dim\n");
+ case ITYPE_MEDIALB_DIM2:
+ return snprintf(buf, PAGE_SIZE, "mlb_dim2\n");
+ case ITYPE_USB:
+ return snprintf(buf, PAGE_SIZE, "usb\n");
+ case ITYPE_PCIE:
+ return snprintf(buf, PAGE_SIZE, "pcie\n");
+ }
+ return snprintf(buf, PAGE_SIZE, "unknown\n");
+}
+
+static DEVICE_ATTR_RO(description);
+static DEVICE_ATTR_RO(interface);
+
+static struct attribute *interface_attrs[] = {
+ DEV_ATTR(description),
+ DEV_ATTR(interface),
+ NULL,
+};
+
+static struct attribute_group interface_attr_group = {
+ .attrs = interface_attrs,
+};
+
+static const struct attribute_group *interface_attr_groups[] = {
+ &interface_attr_group,
+ NULL,
+};
+
+static struct most_component *match_component(char *name)
+{
+ struct most_component *comp;
+
+ list_for_each_entry(comp, &comp_list, list) {
+ if (!strcmp(comp->name, name))
+ return comp;
+ }
+ return NULL;
+}
+
+struct show_links_data {
+ int offs;
+ char *buf;
+};
+
+static int print_links(struct device *dev, void *data)
+{
+ struct show_links_data *d = data;
+ int offs = d->offs;
+ char *buf = d->buf;
+ struct most_channel *c;
+ struct most_interface *iface = dev_get_drvdata(dev);
+
+ list_for_each_entry(c, &iface->p->channel_list, list) {
+ if (c->pipe0.comp) {
+ offs += scnprintf(buf + offs,
+ PAGE_SIZE - offs,
+ "%s:%s:%s\n",
+ c->pipe0.comp->name,
+ dev_name(iface->dev),
+ dev_name(&c->dev));
+ }
+ if (c->pipe1.comp) {
+ offs += scnprintf(buf + offs,
+ PAGE_SIZE - offs,
+ "%s:%s:%s\n",
+ c->pipe1.comp->name,
+ dev_name(iface->dev),
+ dev_name(&c->dev));
+ }
+ }
+ d->offs = offs;
+ return 0;
+}
+
+static int most_match(struct device *dev, struct device_driver *drv)
+{
+ if (!strcmp(dev_name(dev), "most"))
+ return 0;
+ else
+ return 1;
+}
+
+static struct bus_type mostbus = {
+ .name = "most",
+ .match = most_match,
+};
+
+static ssize_t links_show(struct device_driver *drv, char *buf)
+{
+ struct show_links_data d = { .buf = buf };
+
+ bus_for_each_dev(&mostbus, NULL, &d, print_links);
+ return d.offs;
+}
+
+static ssize_t components_show(struct device_driver *drv, char *buf)
+{
+ struct most_component *comp;
+ int offs = 0;
+
+ list_for_each_entry(comp, &comp_list, list) {
+ offs += scnprintf(buf + offs, PAGE_SIZE - offs, "%s\n",
+ comp->name);
+ }
+ return offs;
+}
+
+/**
+ * get_channel - get pointer to channel
+ * @mdev: name of the device interface
+ * @mdev_ch: name of channel
+ */
+static struct most_channel *get_channel(char *mdev, char *mdev_ch)
+{
+ struct device *dev = NULL;
+ struct most_interface *iface;
+ struct most_channel *c, *tmp;
+
+ dev = bus_find_device_by_name(&mostbus, NULL, mdev);
+ if (!dev)
+ return NULL;
+ put_device(dev);
+ iface = dev_get_drvdata(dev);
+ list_for_each_entry_safe(c, tmp, &iface->p->channel_list, list) {
+ if (!strcmp(dev_name(&c->dev), mdev_ch))
+ return c;
+ }
+ return NULL;
+}
+
+static
+inline int link_channel_to_component(struct most_channel *c,
+ struct most_component *comp,
+ char *name,
+ char *comp_param)
+{
+ int ret;
+ struct most_component **comp_ptr;
+
+ if (!c->pipe0.comp)
+ comp_ptr = &c->pipe0.comp;
+ else if (!c->pipe1.comp)
+ comp_ptr = &c->pipe1.comp;
+ else
+ return -ENOSPC;
+
+ *comp_ptr = comp;
+ ret = comp->probe_channel(c->iface, c->channel_id, &c->cfg, name,
+ comp_param);
+ if (ret) {
+ *comp_ptr = NULL;
+ return ret;
+ }
+ return 0;
+}
+
+int most_set_cfg_buffer_size(char *mdev, char *mdev_ch, u16 val)
+{
+ struct most_channel *c = get_channel(mdev, mdev_ch);
+
+ if (!c)
+ return -ENODEV;
+ c->cfg.buffer_size = val;
+ return 0;
+}
+
+int most_set_cfg_subbuffer_size(char *mdev, char *mdev_ch, u16 val)
+{
+ struct most_channel *c = get_channel(mdev, mdev_ch);
+
+ if (!c)
+ return -ENODEV;
+ c->cfg.subbuffer_size = val;
+ return 0;
+}
+
+int most_set_cfg_dbr_size(char *mdev, char *mdev_ch, u16 val)
+{
+ struct most_channel *c = get_channel(mdev, mdev_ch);
+
+ if (!c)
+ return -ENODEV;
+ c->cfg.dbr_size = val;
+ return 0;
+}
+
+int most_set_cfg_num_buffers(char *mdev, char *mdev_ch, u16 val)
+{
+ struct most_channel *c = get_channel(mdev, mdev_ch);
+
+ if (!c)
+ return -ENODEV;
+ c->cfg.num_buffers = val;
+ return 0;
+}
+
+int most_set_cfg_datatype(char *mdev, char *mdev_ch, char *buf)
+{
+ int i;
+ struct most_channel *c = get_channel(mdev, mdev_ch);
+
+ if (!c)
+ return -ENODEV;
+ for (i = 0; i < ARRAY_SIZE(ch_data_type); i++) {
+ if (!strcmp(buf, ch_data_type[i].name)) {
+ c->cfg.data_type = ch_data_type[i].most_ch_data_type;
+ break;
+ }
+ }
+
+ if (i == ARRAY_SIZE(ch_data_type))
+ dev_warn(&c->dev, "Invalid attribute settings\n");
+ return 0;
+}
+
+int most_set_cfg_direction(char *mdev, char *mdev_ch, char *buf)
+{
+ struct most_channel *c = get_channel(mdev, mdev_ch);
+
+ if (!c)
+ return -ENODEV;
+ if (!strcmp(buf, "dir_rx")) {
+ c->cfg.direction = MOST_CH_RX;
+ } else if (!strcmp(buf, "rx")) {
+ c->cfg.direction = MOST_CH_RX;
+ } else if (!strcmp(buf, "dir_tx")) {
+ c->cfg.direction = MOST_CH_TX;
+ } else if (!strcmp(buf, "tx")) {
+ c->cfg.direction = MOST_CH_TX;
+ } else {
+ dev_err(&c->dev, "Invalid direction\n");
+ return -ENODATA;
+ }
+ return 0;
+}
+
+int most_set_cfg_packets_xact(char *mdev, char *mdev_ch, u16 val)
+{
+ struct most_channel *c = get_channel(mdev, mdev_ch);
+
+ if (!c)
+ return -ENODEV;
+ c->cfg.packets_per_xact = val;
+ return 0;
+}
+
+int most_cfg_complete(char *comp_name)
+{
+ struct most_component *comp;
+
+ comp = match_component(comp_name);
+ if (!comp)
+ return -ENODEV;
+
+ return comp->cfg_complete();
+}
+
+int most_add_link(char *mdev, char *mdev_ch, char *comp_name, char *link_name,
+ char *comp_param)
+{
+ struct most_channel *c = get_channel(mdev, mdev_ch);
+ struct most_component *comp = match_component(comp_name);
+
+ if (!c || !comp)
+ return -ENODEV;
+
+ return link_channel_to_component(c, comp, link_name, comp_param);
+}
+
+int most_remove_link(char *mdev, char *mdev_ch, char *comp_name)
+{
+ struct most_channel *c;
+ struct most_component *comp;
+
+ comp = match_component(comp_name);
+ if (!comp)
+ return -ENODEV;
+ c = get_channel(mdev, mdev_ch);
+ if (!c)
+ return -ENODEV;
+
+ if (comp->disconnect_channel(c->iface, c->channel_id))
+ return -EIO;
+ if (c->pipe0.comp == comp)
+ c->pipe0.comp = NULL;
+ if (c->pipe1.comp == comp)
+ c->pipe1.comp = NULL;
+ return 0;
+}
+
+#define DRV_ATTR(_name) (&driver_attr_##_name.attr)
+
+static DRIVER_ATTR_RO(links);
+static DRIVER_ATTR_RO(components);
+
+static struct attribute *mc_attrs[] = {
+ DRV_ATTR(links),
+ DRV_ATTR(components),
+ NULL,
+};
+
+static struct attribute_group mc_attr_group = {
+ .attrs = mc_attrs,
+};
+
+static const struct attribute_group *mc_attr_groups[] = {
+ &mc_attr_group,
+ NULL,
+};
+
+static struct device_driver mostbus_driver = {
+ .name = "most_core",
+ .bus = &mostbus,
+ .groups = mc_attr_groups,
+};
+
+static inline void trash_mbo(struct mbo *mbo)
+{
+ unsigned long flags;
+ struct most_channel *c = mbo->context;
+
+ spin_lock_irqsave(&c->fifo_lock, flags);
+ list_add(&mbo->list, &c->trash_fifo);
+ spin_unlock_irqrestore(&c->fifo_lock, flags);
+}
+
+static bool hdm_mbo_ready(struct most_channel *c)
+{
+ bool empty;
+
+ if (c->enqueue_halt)
+ return false;
+
+ spin_lock_irq(&c->fifo_lock);
+ empty = list_empty(&c->halt_fifo);
+ spin_unlock_irq(&c->fifo_lock);
+
+ return !empty;
+}
+
+static void nq_hdm_mbo(struct mbo *mbo)
+{
+ unsigned long flags;
+ struct most_channel *c = mbo->context;
+
+ spin_lock_irqsave(&c->fifo_lock, flags);
+ list_add_tail(&mbo->list, &c->halt_fifo);
+ spin_unlock_irqrestore(&c->fifo_lock, flags);
+ wake_up_interruptible(&c->hdm_fifo_wq);
+}
+
+static int hdm_enqueue_thread(void *data)
+{
+ struct most_channel *c = data;
+ struct mbo *mbo;
+ int ret;
+ typeof(c->iface->enqueue) enqueue = c->iface->enqueue;
+
+ while (likely(!kthread_should_stop())) {
+ wait_event_interruptible(c->hdm_fifo_wq,
+ hdm_mbo_ready(c) ||
+ kthread_should_stop());
+
+ mutex_lock(&c->nq_mutex);
+ spin_lock_irq(&c->fifo_lock);
+ if (unlikely(c->enqueue_halt || list_empty(&c->halt_fifo))) {
+ spin_unlock_irq(&c->fifo_lock);
+ mutex_unlock(&c->nq_mutex);
+ continue;
+ }
+
+ mbo = list_pop_mbo(&c->halt_fifo);
+ spin_unlock_irq(&c->fifo_lock);
+
+ if (c->cfg.direction == MOST_CH_RX)
+ mbo->buffer_length = c->cfg.buffer_size;
+
+ ret = enqueue(mbo->ifp, mbo->hdm_channel_id, mbo);
+ mutex_unlock(&c->nq_mutex);
+
+ if (unlikely(ret)) {
+ dev_err(&c->dev, "Buffer enqueue failed\n");
+ nq_hdm_mbo(mbo);
+ c->hdm_enqueue_task = NULL;
+ return 0;
+ }
+ }
+
+ return 0;
+}
+
+static int run_enqueue_thread(struct most_channel *c, int channel_id)
+{
+ struct task_struct *task =
+ kthread_run(hdm_enqueue_thread, c, "hdm_fifo_%d",
+ channel_id);
+
+ if (IS_ERR(task))
+ return PTR_ERR(task);
+
+ c->hdm_enqueue_task = task;
+ return 0;
+}
+
+/**
+ * arm_mbo - recycle MBO for further usage
+ * @mbo: most buffer
+ *
+ * This puts an MBO back to the list to have it ready for up coming
+ * tx transactions.
+ *
+ * In case the MBO belongs to a channel that recently has been
+ * poisoned, the MBO is scheduled to be trashed.
+ * Calls the completion handler of an attached component.
+ */
+static void arm_mbo(struct mbo *mbo)
+{
+ unsigned long flags;
+ struct most_channel *c;
+
+ c = mbo->context;
+
+ if (c->is_poisoned) {
+ trash_mbo(mbo);
+ return;
+ }
+
+ spin_lock_irqsave(&c->fifo_lock, flags);
+ ++*mbo->num_buffers_ptr;
+ list_add_tail(&mbo->list, &c->fifo);
+ spin_unlock_irqrestore(&c->fifo_lock, flags);
+
+ if (c->pipe0.refs && c->pipe0.comp->tx_completion)
+ c->pipe0.comp->tx_completion(c->iface, c->channel_id);
+
+ if (c->pipe1.refs && c->pipe1.comp->tx_completion)
+ c->pipe1.comp->tx_completion(c->iface, c->channel_id);
+}
+
+/**
+ * arm_mbo_chain - helper function that arms an MBO chain for the HDM
+ * @c: pointer to interface channel
+ * @dir: direction of the channel
+ * @compl: pointer to completion function
+ *
+ * This allocates buffer objects including the containing DMA coherent
+ * buffer and puts them in the fifo.
+ * Buffers of Rx channels are put in the kthread fifo, hence immediately
+ * submitted to the HDM.
+ *
+ * Returns the number of allocated and enqueued MBOs.
+ */
+static int arm_mbo_chain(struct most_channel *c, int dir,
+ void (*compl)(struct mbo *))
+{
+ unsigned int i;
+ struct mbo *mbo;
+ unsigned long flags;
+ u32 coherent_buf_size = c->cfg.buffer_size + c->cfg.extra_len;
+
+ atomic_set(&c->mbo_nq_level, 0);
+
+ for (i = 0; i < c->cfg.num_buffers; i++) {
+ mbo = kzalloc(sizeof(*mbo), GFP_KERNEL);
+ if (!mbo)
+ goto flush_fifos;
+
+ mbo->context = c;
+ mbo->ifp = c->iface;
+ mbo->hdm_channel_id = c->channel_id;
+ if (c->iface->dma_alloc) {
+ mbo->virt_address =
+ c->iface->dma_alloc(mbo, coherent_buf_size);
+ } else {
+ mbo->virt_address =
+ kzalloc(coherent_buf_size, GFP_KERNEL);
+ }
+ if (!mbo->virt_address)
+ goto release_mbo;
+
+ mbo->complete = compl;
+ mbo->num_buffers_ptr = &dummy_num_buffers;
+ if (dir == MOST_CH_RX) {
+ nq_hdm_mbo(mbo);
+ atomic_inc(&c->mbo_nq_level);
+ } else {
+ spin_lock_irqsave(&c->fifo_lock, flags);
+ list_add_tail(&mbo->list, &c->fifo);
+ spin_unlock_irqrestore(&c->fifo_lock, flags);
+ }
+ }
+ return c->cfg.num_buffers;
+
+release_mbo:
+ kfree(mbo);
+
+flush_fifos:
+ flush_channel_fifos(c);
+ return 0;
+}
+
+/**
+ * most_submit_mbo - submits an MBO to fifo
+ * @mbo: most buffer
+ */
+void most_submit_mbo(struct mbo *mbo)
+{
+ if (WARN_ONCE(!mbo || !mbo->context,
+ "Bad buffer or missing channel reference\n"))
+ return;
+
+ nq_hdm_mbo(mbo);
+}
+EXPORT_SYMBOL_GPL(most_submit_mbo);
+
+/**
+ * most_write_completion - write completion handler
+ * @mbo: most buffer
+ *
+ * This recycles the MBO for further usage. In case the channel has been
+ * poisoned, the MBO is scheduled to be trashed.
+ */
+static void most_write_completion(struct mbo *mbo)
+{
+ struct most_channel *c;
+
+ c = mbo->context;
+ if (unlikely(c->is_poisoned || (mbo->status == MBO_E_CLOSE)))
+ trash_mbo(mbo);
+ else
+ arm_mbo(mbo);
+}
+
+int channel_has_mbo(struct most_interface *iface, int id,
+ struct most_component *comp)
+{
+ struct most_channel *c = iface->p->channel[id];
+ unsigned long flags;
+ int empty;
+
+ if (unlikely(!c))
+ return -EINVAL;
+
+ if (c->pipe0.refs && c->pipe1.refs &&
+ ((comp == c->pipe0.comp && c->pipe0.num_buffers <= 0) ||
+ (comp == c->pipe1.comp && c->pipe1.num_buffers <= 0)))
+ return 0;
+
+ spin_lock_irqsave(&c->fifo_lock, flags);
+ empty = list_empty(&c->fifo);
+ spin_unlock_irqrestore(&c->fifo_lock, flags);
+ return !empty;
+}
+EXPORT_SYMBOL_GPL(channel_has_mbo);
+
+/**
+ * most_get_mbo - get pointer to an MBO of pool
+ * @iface: pointer to interface instance
+ * @id: channel ID
+ * @comp: driver component
+ *
+ * This attempts to get a free buffer out of the channel fifo.
+ * Returns a pointer to MBO on success or NULL otherwise.
+ */
+struct mbo *most_get_mbo(struct most_interface *iface, int id,
+ struct most_component *comp)
+{
+ struct mbo *mbo;
+ struct most_channel *c;
+ unsigned long flags;
+ int *num_buffers_ptr;
+
+ c = iface->p->channel[id];
+ if (unlikely(!c))
+ return NULL;
+
+ if (c->pipe0.refs && c->pipe1.refs &&
+ ((comp == c->pipe0.comp && c->pipe0.num_buffers <= 0) ||
+ (comp == c->pipe1.comp && c->pipe1.num_buffers <= 0)))
+ return NULL;
+
+ if (comp == c->pipe0.comp)
+ num_buffers_ptr = &c->pipe0.num_buffers;
+ else if (comp == c->pipe1.comp)
+ num_buffers_ptr = &c->pipe1.num_buffers;
+ else
+ num_buffers_ptr = &dummy_num_buffers;
+
+ spin_lock_irqsave(&c->fifo_lock, flags);
+ if (list_empty(&c->fifo)) {
+ spin_unlock_irqrestore(&c->fifo_lock, flags);
+ return NULL;
+ }
+ mbo = list_pop_mbo(&c->fifo);
+ --*num_buffers_ptr;
+ spin_unlock_irqrestore(&c->fifo_lock, flags);
+
+ mbo->num_buffers_ptr = num_buffers_ptr;
+ mbo->buffer_length = c->cfg.buffer_size;
+ return mbo;
+}
+EXPORT_SYMBOL_GPL(most_get_mbo);
+
+/**
+ * most_put_mbo - return buffer to pool
+ * @mbo: most buffer
+ */
+void most_put_mbo(struct mbo *mbo)
+{
+ struct most_channel *c = mbo->context;
+
+ if (c->cfg.direction == MOST_CH_TX) {
+ arm_mbo(mbo);
+ return;
+ }
+ nq_hdm_mbo(mbo);
+ atomic_inc(&c->mbo_nq_level);
+}
+EXPORT_SYMBOL_GPL(most_put_mbo);
+
+/**
+ * most_read_completion - read completion handler
+ * @mbo: most buffer
+ *
+ * This function is called by the HDM when data has been received from the
+ * hardware and copied to the buffer of the MBO.
+ *
+ * In case the channel has been poisoned it puts the buffer in the trash queue.
+ * Otherwise, it passes the buffer to an component for further processing.
+ */
+static void most_read_completion(struct mbo *mbo)
+{
+ struct most_channel *c = mbo->context;
+
+ if (unlikely(c->is_poisoned || (mbo->status == MBO_E_CLOSE))) {
+ trash_mbo(mbo);
+ return;
+ }
+
+ if (mbo->status == MBO_E_INVAL) {
+ nq_hdm_mbo(mbo);
+ atomic_inc(&c->mbo_nq_level);
+ return;
+ }
+
+ if (atomic_sub_and_test(1, &c->mbo_nq_level))
+ c->is_starving = 1;
+
+ if (c->pipe0.refs && c->pipe0.comp->rx_completion &&
+ c->pipe0.comp->rx_completion(mbo) == 0)
+ return;
+
+ if (c->pipe1.refs && c->pipe1.comp->rx_completion &&
+ c->pipe1.comp->rx_completion(mbo) == 0)
+ return;
+
+ most_put_mbo(mbo);
+}
+
+/**
+ * most_start_channel - prepares a channel for communication
+ * @iface: pointer to interface instance
+ * @id: channel ID
+ * @comp: driver component
+ *
+ * This prepares the channel for usage. Cross-checks whether the
+ * channel's been properly configured.
+ *
+ * Returns 0 on success or error code otherwise.
+ */
+int most_start_channel(struct most_interface *iface, int id,
+ struct most_component *comp)
+{
+ int num_buffer;
+ int ret;
+ struct most_channel *c = iface->p->channel[id];
+
+ if (unlikely(!c))
+ return -EINVAL;
+
+ mutex_lock(&c->start_mutex);
+ if (c->pipe0.refs + c->pipe1.refs > 0)
+ goto out; /* already started by another component */
+
+ if (!try_module_get(iface->mod)) {
+ dev_err(&c->dev, "Failed to acquire HDM lock\n");
+ mutex_unlock(&c->start_mutex);
+ return -ENOLCK;
+ }
+
+ c->cfg.extra_len = 0;
+ if (c->iface->configure(c->iface, c->channel_id, &c->cfg)) {
+ dev_err(&c->dev, "Channel configuration failed. Go check settings...\n");
+ ret = -EINVAL;
+ goto err_put_module;
+ }
+
+ init_waitqueue_head(&c->hdm_fifo_wq);
+
+ if (c->cfg.direction == MOST_CH_RX)
+ num_buffer = arm_mbo_chain(c, c->cfg.direction,
+ most_read_completion);
+ else
+ num_buffer = arm_mbo_chain(c, c->cfg.direction,
+ most_write_completion);
+ if (unlikely(!num_buffer)) {
+ ret = -ENOMEM;
+ goto err_put_module;
+ }
+
+ ret = run_enqueue_thread(c, id);
+ if (ret)
+ goto err_put_module;
+
+ c->is_starving = 0;
+ c->pipe0.num_buffers = c->cfg.num_buffers / 2;
+ c->pipe1.num_buffers = c->cfg.num_buffers - c->pipe0.num_buffers;
+ atomic_set(&c->mbo_ref, num_buffer);
+
+out:
+ if (comp == c->pipe0.comp)
+ c->pipe0.refs++;
+ if (comp == c->pipe1.comp)
+ c->pipe1.refs++;
+ mutex_unlock(&c->start_mutex);
+ return 0;
+
+err_put_module:
+ module_put(iface->mod);
+ mutex_unlock(&c->start_mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(most_start_channel);
+
+/**
+ * most_stop_channel - stops a running channel
+ * @iface: pointer to interface instance
+ * @id: channel ID
+ * @comp: driver component
+ */
+int most_stop_channel(struct most_interface *iface, int id,
+ struct most_component *comp)
+{
+ struct most_channel *c;
+
+ if (unlikely((!iface) || (id >= iface->num_channels) || (id < 0))) {
+ pr_err("Bad interface or index out of range\n");
+ return -EINVAL;
+ }
+ c = iface->p->channel[id];
+ if (unlikely(!c))
+ return -EINVAL;
+
+ mutex_lock(&c->start_mutex);
+ if (c->pipe0.refs + c->pipe1.refs >= 2)
+ goto out;
+
+ if (c->hdm_enqueue_task)
+ kthread_stop(c->hdm_enqueue_task);
+ c->hdm_enqueue_task = NULL;
+
+ if (iface->mod)
+ module_put(iface->mod);
+
+ c->is_poisoned = true;
+ if (c->iface->poison_channel(c->iface, c->channel_id)) {
+ dev_err(&c->dev, "Failed to stop channel %d of interface %s\n", c->channel_id,
+ c->iface->description);
+ mutex_unlock(&c->start_mutex);
+ return -EAGAIN;
+ }
+ flush_trash_fifo(c);
+ flush_channel_fifos(c);
+
+#ifdef CMPL_INTERRUPTIBLE
+ if (wait_for_completion_interruptible(&c->cleanup)) {
+ dev_err(&c->dev, "Interrupted while cleaning up channel %d\n", c->channel_id);
+ mutex_unlock(&c->start_mutex);
+ return -EINTR;
+ }
+#else
+ wait_for_completion(&c->cleanup);
+#endif
+ c->is_poisoned = false;
+
+out:
+ if (comp == c->pipe0.comp)
+ c->pipe0.refs--;
+ if (comp == c->pipe1.comp)
+ c->pipe1.refs--;
+ mutex_unlock(&c->start_mutex);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(most_stop_channel);
+
+/**
+ * most_register_component - registers a driver component with the core
+ * @comp: driver component
+ */
+int most_register_component(struct most_component *comp)
+{
+ if (!comp) {
+ pr_err("Bad component\n");
+ return -EINVAL;
+ }
+ list_add_tail(&comp->list, &comp_list);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(most_register_component);
+
+static int disconnect_channels(struct device *dev, void *data)
+{
+ struct most_interface *iface;
+ struct most_channel *c, *tmp;
+ struct most_component *comp = data;
+
+ iface = dev_get_drvdata(dev);
+ list_for_each_entry_safe(c, tmp, &iface->p->channel_list, list) {
+ if (c->pipe0.comp == comp || c->pipe1.comp == comp)
+ comp->disconnect_channel(c->iface, c->channel_id);
+ if (c->pipe0.comp == comp)
+ c->pipe0.comp = NULL;
+ if (c->pipe1.comp == comp)
+ c->pipe1.comp = NULL;
+ }
+ return 0;
+}
+
+/**
+ * most_deregister_component - deregisters a driver component with the core
+ * @comp: driver component
+ */
+int most_deregister_component(struct most_component *comp)
+{
+ if (!comp) {
+ pr_err("Bad component\n");
+ return -EINVAL;
+ }
+
+ bus_for_each_dev(&mostbus, NULL, comp, disconnect_channels);
+ list_del(&comp->list);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(most_deregister_component);
+
+static void release_channel(struct device *dev)
+{
+ struct most_channel *c = to_channel(dev);
+
+ kfree(c);
+}
+
+/**
+ * most_register_interface - registers an interface with core
+ * @iface: device interface
+ *
+ * Allocates and initializes a new interface instance and all of its channels.
+ * Returns a pointer to kobject or an error pointer.
+ */
+int most_register_interface(struct most_interface *iface)
+{
+ unsigned int i;
+ int id;
+ struct most_channel *c;
+
+ if (!iface || !iface->enqueue || !iface->configure ||
+ !iface->poison_channel || (iface->num_channels > MAX_CHANNELS))
+ return -EINVAL;
+
+ id = ida_simple_get(&mdev_id, 0, 0, GFP_KERNEL);
+ if (id < 0) {
+ dev_err(iface->dev, "Failed to allocate device ID\n");
+ return id;
+ }
+
+ iface->p = kzalloc(sizeof(*iface->p), GFP_KERNEL);
+ if (!iface->p) {
+ ida_simple_remove(&mdev_id, id);
+ return -ENOMEM;
+ }
+
+ INIT_LIST_HEAD(&iface->p->channel_list);
+ iface->p->dev_id = id;
+ strscpy(iface->p->name, iface->description, sizeof(iface->p->name));
+ iface->dev->bus = &mostbus;
+ iface->dev->groups = interface_attr_groups;
+ dev_set_drvdata(iface->dev, iface);
+ if (device_register(iface->dev)) {
+ dev_err(iface->dev, "Failed to register interface device\n");
+ kfree(iface->p);
+ put_device(iface->dev);
+ ida_simple_remove(&mdev_id, id);
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < iface->num_channels; i++) {
+ const char *name_suffix = iface->channel_vector[i].name_suffix;
+
+ c = kzalloc(sizeof(*c), GFP_KERNEL);
+ if (!c)
+ goto err_free_resources;
+ if (!name_suffix)
+ snprintf(c->name, STRING_SIZE, "ch%d", i);
+ else
+ snprintf(c->name, STRING_SIZE, "%s", name_suffix);
+ c->dev.init_name = c->name;
+ c->dev.parent = iface->dev;
+ c->dev.groups = channel_attr_groups;
+ c->dev.release = release_channel;
+ iface->p->channel[i] = c;
+ c->is_starving = 0;
+ c->iface = iface;
+ c->channel_id = i;
+ c->keep_mbo = false;
+ c->enqueue_halt = false;
+ c->is_poisoned = false;
+ c->cfg.direction = 0;
+ c->cfg.data_type = 0;
+ c->cfg.num_buffers = 0;
+ c->cfg.buffer_size = 0;
+ c->cfg.subbuffer_size = 0;
+ c->cfg.packets_per_xact = 0;
+ spin_lock_init(&c->fifo_lock);
+ INIT_LIST_HEAD(&c->fifo);
+ INIT_LIST_HEAD(&c->trash_fifo);
+ INIT_LIST_HEAD(&c->halt_fifo);
+ init_completion(&c->cleanup);
+ atomic_set(&c->mbo_ref, 0);
+ mutex_init(&c->start_mutex);
+ mutex_init(&c->nq_mutex);
+ list_add_tail(&c->list, &iface->p->channel_list);
+ if (device_register(&c->dev)) {
+ dev_err(&c->dev, "Failed to register channel device\n");
+ goto err_free_most_channel;
+ }
+ }
+ most_interface_register_notify(iface->description);
+ return 0;
+
+err_free_most_channel:
+ put_device(&c->dev);
+
+err_free_resources:
+ while (i > 0) {
+ c = iface->p->channel[--i];
+ device_unregister(&c->dev);
+ }
+ kfree(iface->p);
+ device_unregister(iface->dev);
+ ida_simple_remove(&mdev_id, id);
+ return -ENOMEM;
+}
+EXPORT_SYMBOL_GPL(most_register_interface);
+
+/**
+ * most_deregister_interface - deregisters an interface with core
+ * @iface: device interface
+ *
+ * Before removing an interface instance from the list, all running
+ * channels are stopped and poisoned.
+ */
+void most_deregister_interface(struct most_interface *iface)
+{
+ int i;
+ struct most_channel *c;
+
+ for (i = 0; i < iface->num_channels; i++) {
+ c = iface->p->channel[i];
+ if (c->pipe0.comp)
+ c->pipe0.comp->disconnect_channel(c->iface,
+ c->channel_id);
+ if (c->pipe1.comp)
+ c->pipe1.comp->disconnect_channel(c->iface,
+ c->channel_id);
+ c->pipe0.comp = NULL;
+ c->pipe1.comp = NULL;
+ list_del(&c->list);
+ device_unregister(&c->dev);
+ }
+
+ ida_simple_remove(&mdev_id, iface->p->dev_id);
+ kfree(iface->p);
+ device_unregister(iface->dev);
+}
+EXPORT_SYMBOL_GPL(most_deregister_interface);
+
+/**
+ * most_stop_enqueue - prevents core from enqueueing MBOs
+ * @iface: pointer to interface
+ * @id: channel id
+ *
+ * This is called by an HDM that _cannot_ attend to its duties and
+ * is imminent to get run over by the core. The core is not going to
+ * enqueue any further packets unless the flagging HDM calls
+ * most_resume enqueue().
+ */
+void most_stop_enqueue(struct most_interface *iface, int id)
+{
+ struct most_channel *c = iface->p->channel[id];
+
+ if (!c)
+ return;
+
+ mutex_lock(&c->nq_mutex);
+ c->enqueue_halt = true;
+ mutex_unlock(&c->nq_mutex);
+}
+EXPORT_SYMBOL_GPL(most_stop_enqueue);
+
+/**
+ * most_resume_enqueue - allow core to enqueue MBOs again
+ * @iface: pointer to interface
+ * @id: channel id
+ *
+ * This clears the enqueue halt flag and enqueues all MBOs currently
+ * sitting in the wait fifo.
+ */
+void most_resume_enqueue(struct most_interface *iface, int id)
+{
+ struct most_channel *c = iface->p->channel[id];
+
+ if (!c)
+ return;
+
+ mutex_lock(&c->nq_mutex);
+ c->enqueue_halt = false;
+ mutex_unlock(&c->nq_mutex);
+
+ wake_up_interruptible(&c->hdm_fifo_wq);
+}
+EXPORT_SYMBOL_GPL(most_resume_enqueue);
+
+static int __init most_init(void)
+{
+ int err;
+
+ INIT_LIST_HEAD(&comp_list);
+ ida_init(&mdev_id);
+
+ err = bus_register(&mostbus);
+ if (err) {
+ pr_err("Failed to register most bus\n");
+ return err;
+ }
+ err = driver_register(&mostbus_driver);
+ if (err) {
+ pr_err("Failed to register core driver\n");
+ goto err_unregister_bus;
+ }
+ configfs_init();
+ return 0;
+
+err_unregister_bus:
+ bus_unregister(&mostbus);
+ return err;
+}
+
+static void __exit most_exit(void)
+{
+ driver_unregister(&mostbus_driver);
+ bus_unregister(&mostbus);
+ ida_destroy(&mdev_id);
+}
+
+subsys_initcall(most_init);
+module_exit(most_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>");
+MODULE_DESCRIPTION("Core module of stacked MOST Linux driver");
diff --git a/drivers/most/most_cdev.c b/drivers/most/most_cdev.c
new file mode 100644
index 0000000..0448807
--- /dev/null
+++ b/drivers/most/most_cdev.c
@@ -0,0 +1,543 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * cdev.c - Character device component for Mostcore
+ *
+ * Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG
+ */
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/cdev.h>
+#include <linux/poll.h>
+#include <linux/kfifo.h>
+#include <linux/uaccess.h>
+#include <linux/idr.h>
+#include <linux/most.h>
+
+#define CHRDEV_REGION_SIZE 50
+
+static struct cdev_component {
+ dev_t devno;
+ struct ida minor_id;
+ unsigned int major;
+ struct class *class;
+ struct most_component cc;
+} comp;
+
+struct comp_channel {
+ wait_queue_head_t wq;
+ spinlock_t unlink; /* synchronization lock to unlink channels */
+ struct cdev cdev;
+ struct device *dev;
+ struct mutex io_mutex;
+ struct most_interface *iface;
+ struct most_channel_config *cfg;
+ unsigned int channel_id;
+ dev_t devno;
+ size_t mbo_offs;
+ DECLARE_KFIFO_PTR(fifo, typeof(struct mbo *));
+ int access_ref;
+ struct list_head list;
+};
+
+#define to_channel(d) container_of(d, struct comp_channel, cdev)
+static struct list_head channel_list;
+static spinlock_t ch_list_lock;
+
+static inline bool ch_has_mbo(struct comp_channel *c)
+{
+ return channel_has_mbo(c->iface, c->channel_id, &comp.cc) > 0;
+}
+
+static inline struct mbo *ch_get_mbo(struct comp_channel *c, struct mbo **mbo)
+{
+ if (!kfifo_peek(&c->fifo, mbo)) {
+ *mbo = most_get_mbo(c->iface, c->channel_id, &comp.cc);
+ if (*mbo)
+ kfifo_in(&c->fifo, mbo, 1);
+ }
+ return *mbo;
+}
+
+static struct comp_channel *get_channel(struct most_interface *iface, int id)
+{
+ struct comp_channel *c, *tmp;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ch_list_lock, flags);
+ list_for_each_entry_safe(c, tmp, &channel_list, list) {
+ if ((c->iface == iface) && (c->channel_id == id)) {
+ spin_unlock_irqrestore(&ch_list_lock, flags);
+ return c;
+ }
+ }
+ spin_unlock_irqrestore(&ch_list_lock, flags);
+ return NULL;
+}
+
+static void stop_channel(struct comp_channel *c)
+{
+ struct mbo *mbo;
+
+ while (kfifo_out((struct kfifo *)&c->fifo, &mbo, 1))
+ most_put_mbo(mbo);
+ most_stop_channel(c->iface, c->channel_id, &comp.cc);
+}
+
+static void destroy_cdev(struct comp_channel *c)
+{
+ unsigned long flags;
+
+ device_destroy(comp.class, c->devno);
+ cdev_del(&c->cdev);
+ spin_lock_irqsave(&ch_list_lock, flags);
+ list_del(&c->list);
+ spin_unlock_irqrestore(&ch_list_lock, flags);
+}
+
+static void destroy_channel(struct comp_channel *c)
+{
+ ida_simple_remove(&comp.minor_id, MINOR(c->devno));
+ kfifo_free(&c->fifo);
+ kfree(c);
+}
+
+/**
+ * comp_open - implements the syscall to open the device
+ * @inode: inode pointer
+ * @filp: file pointer
+ *
+ * This stores the channel pointer in the private data field of
+ * the file structure and activates the channel within the core.
+ */
+static int comp_open(struct inode *inode, struct file *filp)
+{
+ struct comp_channel *c;
+ int ret;
+
+ c = to_channel(inode->i_cdev);
+ filp->private_data = c;
+
+ if (((c->cfg->direction == MOST_CH_RX) &&
+ ((filp->f_flags & O_ACCMODE) != O_RDONLY)) ||
+ ((c->cfg->direction == MOST_CH_TX) &&
+ ((filp->f_flags & O_ACCMODE) != O_WRONLY))) {
+ return -EACCES;
+ }
+
+ mutex_lock(&c->io_mutex);
+ if (!c->dev) {
+ mutex_unlock(&c->io_mutex);
+ return -ENODEV;
+ }
+
+ if (c->access_ref) {
+ mutex_unlock(&c->io_mutex);
+ return -EBUSY;
+ }
+
+ c->mbo_offs = 0;
+ ret = most_start_channel(c->iface, c->channel_id, &comp.cc);
+ if (!ret)
+ c->access_ref = 1;
+ mutex_unlock(&c->io_mutex);
+ return ret;
+}
+
+/**
+ * comp_close - implements the syscall to close the device
+ * @inode: inode pointer
+ * @filp: file pointer
+ *
+ * This stops the channel within the core.
+ */
+static int comp_close(struct inode *inode, struct file *filp)
+{
+ struct comp_channel *c = to_channel(inode->i_cdev);
+
+ mutex_lock(&c->io_mutex);
+ spin_lock(&c->unlink);
+ c->access_ref = 0;
+ spin_unlock(&c->unlink);
+ if (c->dev) {
+ stop_channel(c);
+ mutex_unlock(&c->io_mutex);
+ } else {
+ mutex_unlock(&c->io_mutex);
+ destroy_channel(c);
+ }
+ return 0;
+}
+
+/**
+ * comp_write - implements the syscall to write to the device
+ * @filp: file pointer
+ * @buf: pointer to user buffer
+ * @count: number of bytes to write
+ * @offset: offset from where to start writing
+ */
+static ssize_t comp_write(struct file *filp, const char __user *buf,
+ size_t count, loff_t *offset)
+{
+ int ret;
+ size_t to_copy, left;
+ struct mbo *mbo = NULL;
+ struct comp_channel *c = filp->private_data;
+
+ mutex_lock(&c->io_mutex);
+ while (c->dev && !ch_get_mbo(c, &mbo)) {
+ mutex_unlock(&c->io_mutex);
+
+ if ((filp->f_flags & O_NONBLOCK))
+ return -EAGAIN;
+ if (wait_event_interruptible(c->wq, ch_has_mbo(c) || !c->dev))
+ return -ERESTARTSYS;
+ mutex_lock(&c->io_mutex);
+ }
+
+ if (unlikely(!c->dev)) {
+ ret = -ENODEV;
+ goto unlock;
+ }
+
+ to_copy = min(count, c->cfg->buffer_size - c->mbo_offs);
+ left = copy_from_user(mbo->virt_address + c->mbo_offs, buf, to_copy);
+ if (left == to_copy) {
+ ret = -EFAULT;
+ goto unlock;
+ }
+
+ c->mbo_offs += to_copy - left;
+ if (c->mbo_offs >= c->cfg->buffer_size ||
+ c->cfg->data_type == MOST_CH_CONTROL ||
+ c->cfg->data_type == MOST_CH_ASYNC) {
+ kfifo_skip(&c->fifo);
+ mbo->buffer_length = c->mbo_offs;
+ c->mbo_offs = 0;
+ most_submit_mbo(mbo);
+ }
+
+ ret = to_copy - left;
+unlock:
+ mutex_unlock(&c->io_mutex);
+ return ret;
+}
+
+/**
+ * comp_read - implements the syscall to read from the device
+ * @filp: file pointer
+ * @buf: pointer to user buffer
+ * @count: number of bytes to read
+ * @offset: offset from where to start reading
+ */
+static ssize_t
+comp_read(struct file *filp, char __user *buf, size_t count, loff_t *offset)
+{
+ size_t to_copy, not_copied, copied;
+ struct mbo *mbo = NULL;
+ struct comp_channel *c = filp->private_data;
+
+ mutex_lock(&c->io_mutex);
+ while (c->dev && !kfifo_peek(&c->fifo, &mbo)) {
+ mutex_unlock(&c->io_mutex);
+ if (filp->f_flags & O_NONBLOCK)
+ return -EAGAIN;
+ if (wait_event_interruptible(c->wq,
+ (!kfifo_is_empty(&c->fifo) ||
+ (!c->dev))))
+ return -ERESTARTSYS;
+ mutex_lock(&c->io_mutex);
+ }
+
+ /* make sure we don't submit to gone devices */
+ if (unlikely(!c->dev)) {
+ mutex_unlock(&c->io_mutex);
+ return -ENODEV;
+ }
+
+ to_copy = min_t(size_t,
+ count,
+ mbo->processed_length - c->mbo_offs);
+
+ not_copied = copy_to_user(buf,
+ mbo->virt_address + c->mbo_offs,
+ to_copy);
+
+ copied = to_copy - not_copied;
+
+ c->mbo_offs += copied;
+ if (c->mbo_offs >= mbo->processed_length) {
+ kfifo_skip(&c->fifo);
+ most_put_mbo(mbo);
+ c->mbo_offs = 0;
+ }
+ mutex_unlock(&c->io_mutex);
+ return copied;
+}
+
+static __poll_t comp_poll(struct file *filp, poll_table *wait)
+{
+ struct comp_channel *c = filp->private_data;
+ __poll_t mask = 0;
+
+ poll_wait(filp, &c->wq, wait);
+
+ mutex_lock(&c->io_mutex);
+ if (c->cfg->direction == MOST_CH_RX) {
+ if (!c->dev || !kfifo_is_empty(&c->fifo))
+ mask |= EPOLLIN | EPOLLRDNORM;
+ } else {
+ if (!c->dev || !kfifo_is_empty(&c->fifo) || ch_has_mbo(c))
+ mask |= EPOLLOUT | EPOLLWRNORM;
+ }
+ mutex_unlock(&c->io_mutex);
+ return mask;
+}
+
+/**
+ * Initialization of struct file_operations
+ */
+static const struct file_operations channel_fops = {
+ .owner = THIS_MODULE,
+ .read = comp_read,
+ .write = comp_write,
+ .open = comp_open,
+ .release = comp_close,
+ .poll = comp_poll,
+};
+
+/**
+ * comp_disconnect_channel - disconnect a channel
+ * @iface: pointer to interface instance
+ * @channel_id: channel index
+ *
+ * This frees allocated memory and removes the cdev that represents this
+ * channel in user space.
+ */
+static int comp_disconnect_channel(struct most_interface *iface, int channel_id)
+{
+ struct comp_channel *c;
+
+ c = get_channel(iface, channel_id);
+ if (!c)
+ return -EINVAL;
+
+ mutex_lock(&c->io_mutex);
+ spin_lock(&c->unlink);
+ c->dev = NULL;
+ spin_unlock(&c->unlink);
+ destroy_cdev(c);
+ if (c->access_ref) {
+ stop_channel(c);
+ wake_up_interruptible(&c->wq);
+ mutex_unlock(&c->io_mutex);
+ } else {
+ mutex_unlock(&c->io_mutex);
+ destroy_channel(c);
+ }
+ return 0;
+}
+
+/**
+ * comp_rx_completion - completion handler for rx channels
+ * @mbo: pointer to buffer object that has completed
+ *
+ * This searches for the channel linked to this MBO and stores it in the local
+ * fifo buffer.
+ */
+static int comp_rx_completion(struct mbo *mbo)
+{
+ struct comp_channel *c;
+
+ if (!mbo)
+ return -EINVAL;
+
+ c = get_channel(mbo->ifp, mbo->hdm_channel_id);
+ if (!c)
+ return -EINVAL;
+
+ spin_lock(&c->unlink);
+ if (!c->access_ref || !c->dev) {
+ spin_unlock(&c->unlink);
+ return -ENODEV;
+ }
+ kfifo_in(&c->fifo, &mbo, 1);
+ spin_unlock(&c->unlink);
+#ifdef DEBUG_MESG
+ if (kfifo_is_full(&c->fifo))
+ dev_warn(c->dev, "Fifo is full\n");
+#endif
+ wake_up_interruptible(&c->wq);
+ return 0;
+}
+
+/**
+ * comp_tx_completion - completion handler for tx channels
+ * @iface: pointer to interface instance
+ * @channel_id: channel index/ID
+ *
+ * This wakes sleeping processes in the wait-queue.
+ */
+static int comp_tx_completion(struct most_interface *iface, int channel_id)
+{
+ struct comp_channel *c;
+
+ c = get_channel(iface, channel_id);
+ if (!c)
+ return -EINVAL;
+
+ if ((channel_id < 0) || (channel_id >= iface->num_channels)) {
+ dev_warn(c->dev, "Channel ID out of range\n");
+ return -EINVAL;
+ }
+
+ wake_up_interruptible(&c->wq);
+ return 0;
+}
+
+/**
+ * comp_probe - probe function of the driver module
+ * @iface: pointer to interface instance
+ * @channel_id: channel index/ID
+ * @cfg: pointer to actual channel configuration
+ * @name: name of the device to be created
+ *
+ * This allocates achannel object and creates the device node in /dev
+ *
+ * Returns 0 on success or error code otherwise.
+ */
+static int comp_probe(struct most_interface *iface, int channel_id,
+ struct most_channel_config *cfg, char *name, char *args)
+{
+ struct comp_channel *c;
+ unsigned long cl_flags;
+ int retval;
+ int current_minor;
+
+ if (!cfg || !name)
+ return -EINVAL;
+
+ c = get_channel(iface, channel_id);
+ if (c)
+ return -EEXIST;
+
+ current_minor = ida_simple_get(&comp.minor_id, 0, 0, GFP_KERNEL);
+ if (current_minor < 0)
+ return current_minor;
+
+ c = kzalloc(sizeof(*c), GFP_KERNEL);
+ if (!c) {
+ retval = -ENOMEM;
+ goto err_remove_ida;
+ }
+
+ c->devno = MKDEV(comp.major, current_minor);
+ cdev_init(&c->cdev, &channel_fops);
+ c->cdev.owner = THIS_MODULE;
+ retval = cdev_add(&c->cdev, c->devno, 1);
+ if (retval < 0)
+ goto err_free_c;
+ c->iface = iface;
+ c->cfg = cfg;
+ c->channel_id = channel_id;
+ c->access_ref = 0;
+ spin_lock_init(&c->unlink);
+ INIT_KFIFO(c->fifo);
+ retval = kfifo_alloc(&c->fifo, cfg->num_buffers, GFP_KERNEL);
+ if (retval)
+ goto err_del_cdev_and_free_channel;
+ init_waitqueue_head(&c->wq);
+ mutex_init(&c->io_mutex);
+ spin_lock_irqsave(&ch_list_lock, cl_flags);
+ list_add_tail(&c->list, &channel_list);
+ spin_unlock_irqrestore(&ch_list_lock, cl_flags);
+ c->dev = device_create(comp.class, NULL, c->devno, NULL, "%s", name);
+
+ if (IS_ERR(c->dev)) {
+ retval = PTR_ERR(c->dev);
+ goto err_free_kfifo_and_del_list;
+ }
+ kobject_uevent(&c->dev->kobj, KOBJ_ADD);
+ return 0;
+
+err_free_kfifo_and_del_list:
+ kfifo_free(&c->fifo);
+ list_del(&c->list);
+err_del_cdev_and_free_channel:
+ cdev_del(&c->cdev);
+err_free_c:
+ kfree(c);
+err_remove_ida:
+ ida_simple_remove(&comp.minor_id, current_minor);
+ return retval;
+}
+
+static struct cdev_component comp = {
+ .cc = {
+ .mod = THIS_MODULE,
+ .name = "cdev",
+ .probe_channel = comp_probe,
+ .disconnect_channel = comp_disconnect_channel,
+ .rx_completion = comp_rx_completion,
+ .tx_completion = comp_tx_completion,
+ },
+};
+
+static int __init mod_init(void)
+{
+ int err;
+
+ comp.class = class_create(THIS_MODULE, "most_cdev");
+ if (IS_ERR(comp.class))
+ return PTR_ERR(comp.class);
+
+ INIT_LIST_HEAD(&channel_list);
+ spin_lock_init(&ch_list_lock);
+ ida_init(&comp.minor_id);
+
+ err = alloc_chrdev_region(&comp.devno, 0, CHRDEV_REGION_SIZE, "cdev");
+ if (err < 0)
+ goto dest_ida;
+ comp.major = MAJOR(comp.devno);
+ err = most_register_component(&comp.cc);
+ if (err)
+ goto free_cdev;
+ err = most_register_configfs_subsys(&comp.cc);
+ if (err)
+ goto deregister_comp;
+ return 0;
+
+deregister_comp:
+ most_deregister_component(&comp.cc);
+free_cdev:
+ unregister_chrdev_region(comp.devno, CHRDEV_REGION_SIZE);
+dest_ida:
+ ida_destroy(&comp.minor_id);
+ class_destroy(comp.class);
+ return err;
+}
+
+static void __exit mod_exit(void)
+{
+ struct comp_channel *c, *tmp;
+
+ most_deregister_configfs_subsys(&comp.cc);
+ most_deregister_component(&comp.cc);
+
+ list_for_each_entry_safe(c, tmp, &channel_list, list) {
+ destroy_cdev(c);
+ destroy_channel(c);
+ }
+ unregister_chrdev_region(comp.devno, CHRDEV_REGION_SIZE);
+ ida_destroy(&comp.minor_id);
+ class_destroy(comp.class);
+}
+
+module_init(mod_init);
+module_exit(mod_exit);
+MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("character device component for mostcore");
diff --git a/drivers/most/most_usb.c b/drivers/most/most_usb.c
new file mode 100644
index 0000000..acabb77
--- /dev/null
+++ b/drivers/most/most_usb.c
@@ -0,0 +1,1171 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * usb.c - Hardware dependent module for USB
+ *
+ * Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/usb.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/cdev.h>
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/completion.h>
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/sysfs.h>
+#include <linux/dma-mapping.h>
+#include <linux/etherdevice.h>
+#include <linux/uaccess.h>
+#include <linux/most.h>
+
+#define USB_MTU 512
+#define NO_ISOCHRONOUS_URB 0
+#define AV_PACKETS_PER_XACT 2
+#define BUF_CHAIN_SIZE 0xFFFF
+#define MAX_NUM_ENDPOINTS 30
+#define MAX_SUFFIX_LEN 10
+#define MAX_STRING_LEN 80
+#define MAX_BUF_SIZE 0xFFFF
+
+#define USB_VENDOR_ID_SMSC 0x0424 /* VID: SMSC */
+#define USB_DEV_ID_BRDG 0xC001 /* PID: USB Bridge */
+#define USB_DEV_ID_OS81118 0xCF18 /* PID: USB OS81118 */
+#define USB_DEV_ID_OS81119 0xCF19 /* PID: USB OS81119 */
+#define USB_DEV_ID_OS81210 0xCF30 /* PID: USB OS81210 */
+/* DRCI Addresses */
+#define DRCI_REG_NI_STATE 0x0100
+#define DRCI_REG_PACKET_BW 0x0101
+#define DRCI_REG_NODE_ADDR 0x0102
+#define DRCI_REG_NODE_POS 0x0103
+#define DRCI_REG_MEP_FILTER 0x0140
+#define DRCI_REG_HASH_TBL0 0x0141
+#define DRCI_REG_HASH_TBL1 0x0142
+#define DRCI_REG_HASH_TBL2 0x0143
+#define DRCI_REG_HASH_TBL3 0x0144
+#define DRCI_REG_HW_ADDR_HI 0x0145
+#define DRCI_REG_HW_ADDR_MI 0x0146
+#define DRCI_REG_HW_ADDR_LO 0x0147
+#define DRCI_REG_BASE 0x1100
+#define DRCI_COMMAND 0x02
+#define DRCI_READ_REQ 0xA0
+#define DRCI_WRITE_REQ 0xA1
+
+/**
+ * struct most_dci_obj - Direct Communication Interface
+ * @kobj:position in sysfs
+ * @usb_device: pointer to the usb device
+ * @reg_addr: register address for arbitrary DCI access
+ */
+struct most_dci_obj {
+ struct device dev;
+ struct usb_device *usb_device;
+ u16 reg_addr;
+};
+
+#define to_dci_obj(p) container_of(p, struct most_dci_obj, dev)
+
+struct most_dev;
+
+struct clear_hold_work {
+ struct work_struct ws;
+ struct most_dev *mdev;
+ unsigned int channel;
+ int pipe;
+};
+
+#define to_clear_hold_work(w) container_of(w, struct clear_hold_work, ws)
+
+/**
+ * struct most_dev - holds all usb interface specific stuff
+ * @usb_device: pointer to usb device
+ * @iface: hardware interface
+ * @cap: channel capabilities
+ * @conf: channel configuration
+ * @dci: direct communication interface of hardware
+ * @ep_address: endpoint address table
+ * @description: device description
+ * @suffix: suffix for channel name
+ * @channel_lock: synchronize channel access
+ * @padding_active: indicates channel uses padding
+ * @is_channel_healthy: health status table of each channel
+ * @busy_urbs: list of anchored items
+ * @io_mutex: synchronize I/O with disconnect
+ * @link_stat_timer: timer for link status reports
+ * @poll_work_obj: work for polling link status
+ */
+struct most_dev {
+ struct device dev;
+ struct usb_device *usb_device;
+ struct most_interface iface;
+ struct most_channel_capability *cap;
+ struct most_channel_config *conf;
+ struct most_dci_obj *dci;
+ u8 *ep_address;
+ char description[MAX_STRING_LEN];
+ char suffix[MAX_NUM_ENDPOINTS][MAX_SUFFIX_LEN];
+ spinlock_t channel_lock[MAX_NUM_ENDPOINTS]; /* sync channel access */
+ bool padding_active[MAX_NUM_ENDPOINTS];
+ bool is_channel_healthy[MAX_NUM_ENDPOINTS];
+ struct clear_hold_work clear_work[MAX_NUM_ENDPOINTS];
+ struct usb_anchor *busy_urbs;
+ struct mutex io_mutex;
+ struct timer_list link_stat_timer;
+ struct work_struct poll_work_obj;
+ void (*on_netinfo)(struct most_interface *most_iface,
+ unsigned char link_state, unsigned char *addrs);
+};
+
+#define to_mdev(d) container_of(d, struct most_dev, iface)
+#define to_mdev_from_dev(d) container_of(d, struct most_dev, dev)
+#define to_mdev_from_work(w) container_of(w, struct most_dev, poll_work_obj)
+
+static void wq_clear_halt(struct work_struct *wq_obj);
+static void wq_netinfo(struct work_struct *wq_obj);
+
+/**
+ * drci_rd_reg - read a DCI register
+ * @dev: usb device
+ * @reg: register address
+ * @buf: buffer to store data
+ *
+ * This is reads data from INIC's direct register communication interface
+ */
+static inline int drci_rd_reg(struct usb_device *dev, u16 reg, u16 *buf)
+{
+ int retval;
+ __le16 *dma_buf;
+ u8 req_type = USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE;
+
+ dma_buf = kzalloc(sizeof(*dma_buf), GFP_KERNEL);
+ if (!dma_buf)
+ return -ENOMEM;
+
+ retval = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+ DRCI_READ_REQ, req_type,
+ 0x0000,
+ reg, dma_buf, sizeof(*dma_buf),
+ USB_CTRL_GET_TIMEOUT);
+ *buf = le16_to_cpu(*dma_buf);
+ kfree(dma_buf);
+
+ if (retval < 0)
+ return retval;
+ return 0;
+}
+
+/**
+ * drci_wr_reg - write a DCI register
+ * @dev: usb device
+ * @reg: register address
+ * @data: data to write
+ *
+ * This is writes data to INIC's direct register communication interface
+ */
+static inline int drci_wr_reg(struct usb_device *dev, u16 reg, u16 data)
+{
+ return usb_control_msg(dev,
+ usb_sndctrlpipe(dev, 0),
+ DRCI_WRITE_REQ,
+ USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+ data,
+ reg,
+ NULL,
+ 0,
+ USB_CTRL_SET_TIMEOUT);
+}
+
+static inline int start_sync_ep(struct usb_device *usb_dev, u16 ep)
+{
+ return drci_wr_reg(usb_dev, DRCI_REG_BASE + DRCI_COMMAND + ep * 16, 1);
+}
+
+/**
+ * get_stream_frame_size - calculate frame size of current configuration
+ * @dev: device structure
+ * @cfg: channel configuration
+ */
+static unsigned int get_stream_frame_size(struct device *dev,
+ struct most_channel_config *cfg)
+{
+ unsigned int frame_size;
+ unsigned int sub_size = cfg->subbuffer_size;
+
+ if (!sub_size) {
+ dev_warn(dev, "Misconfig: Subbuffer size zero.\n");
+ return 0;
+ }
+ switch (cfg->data_type) {
+ case MOST_CH_ISOC:
+ frame_size = AV_PACKETS_PER_XACT * sub_size;
+ break;
+ case MOST_CH_SYNC:
+ if (cfg->packets_per_xact == 0) {
+ dev_warn(dev, "Misconfig: Packets per XACT zero\n");
+ frame_size = 0;
+ } else if (cfg->packets_per_xact == 0xFF) {
+ frame_size = (USB_MTU / sub_size) * sub_size;
+ } else {
+ frame_size = cfg->packets_per_xact * sub_size;
+ }
+ break;
+ default:
+ dev_warn(dev, "Query frame size of non-streaming channel\n");
+ frame_size = 0;
+ break;
+ }
+ return frame_size;
+}
+
+/**
+ * hdm_poison_channel - mark buffers of this channel as invalid
+ * @iface: pointer to the interface
+ * @channel: channel ID
+ *
+ * This unlinks all URBs submitted to the HCD,
+ * calls the associated completion function of the core and removes
+ * them from the list.
+ *
+ * Returns 0 on success or error code otherwise.
+ */
+static int hdm_poison_channel(struct most_interface *iface, int channel)
+{
+ struct most_dev *mdev = to_mdev(iface);
+ unsigned long flags;
+ spinlock_t *lock; /* temp. lock */
+
+ if (channel < 0 || channel >= iface->num_channels) {
+ dev_warn(&mdev->usb_device->dev, "Channel ID out of range.\n");
+ return -ECHRNG;
+ }
+
+ lock = mdev->channel_lock + channel;
+ spin_lock_irqsave(lock, flags);
+ mdev->is_channel_healthy[channel] = false;
+ spin_unlock_irqrestore(lock, flags);
+
+ cancel_work_sync(&mdev->clear_work[channel].ws);
+
+ mutex_lock(&mdev->io_mutex);
+ usb_kill_anchored_urbs(&mdev->busy_urbs[channel]);
+ if (mdev->padding_active[channel])
+ mdev->padding_active[channel] = false;
+
+ if (mdev->conf[channel].data_type == MOST_CH_ASYNC) {
+ del_timer_sync(&mdev->link_stat_timer);
+ cancel_work_sync(&mdev->poll_work_obj);
+ }
+ mutex_unlock(&mdev->io_mutex);
+ return 0;
+}
+
+/**
+ * hdm_add_padding - add padding bytes
+ * @mdev: most device
+ * @channel: channel ID
+ * @mbo: buffer object
+ *
+ * This inserts the INIC hardware specific padding bytes into a streaming
+ * channel's buffer
+ */
+static int hdm_add_padding(struct most_dev *mdev, int channel, struct mbo *mbo)
+{
+ struct most_channel_config *conf = &mdev->conf[channel];
+ unsigned int frame_size = get_stream_frame_size(&mdev->dev, conf);
+ unsigned int j, num_frames;
+
+ if (!frame_size)
+ return -EINVAL;
+ num_frames = mbo->buffer_length / frame_size;
+
+ if (num_frames < 1) {
+ dev_err(&mdev->usb_device->dev,
+ "Missed minimal transfer unit.\n");
+ return -EINVAL;
+ }
+
+ for (j = num_frames - 1; j > 0; j--)
+ memmove(mbo->virt_address + j * USB_MTU,
+ mbo->virt_address + j * frame_size,
+ frame_size);
+ mbo->buffer_length = num_frames * USB_MTU;
+ return 0;
+}
+
+/**
+ * hdm_remove_padding - remove padding bytes
+ * @mdev: most device
+ * @channel: channel ID
+ * @mbo: buffer object
+ *
+ * This takes the INIC hardware specific padding bytes off a streaming
+ * channel's buffer.
+ */
+static int hdm_remove_padding(struct most_dev *mdev, int channel,
+ struct mbo *mbo)
+{
+ struct most_channel_config *const conf = &mdev->conf[channel];
+ unsigned int frame_size = get_stream_frame_size(&mdev->dev, conf);
+ unsigned int j, num_frames;
+
+ if (!frame_size)
+ return -EINVAL;
+ num_frames = mbo->processed_length / USB_MTU;
+
+ for (j = 1; j < num_frames; j++)
+ memmove(mbo->virt_address + frame_size * j,
+ mbo->virt_address + USB_MTU * j,
+ frame_size);
+
+ mbo->processed_length = frame_size * num_frames;
+ return 0;
+}
+
+/**
+ * hdm_write_completion - completion function for submitted Tx URBs
+ * @urb: the URB that has been completed
+ *
+ * This checks the status of the completed URB. In case the URB has been
+ * unlinked before, it is immediately freed. On any other error the MBO
+ * transfer flag is set. On success it frees allocated resources and calls
+ * the completion function.
+ *
+ * Context: interrupt!
+ */
+static void hdm_write_completion(struct urb *urb)
+{
+ struct mbo *mbo = urb->context;
+ struct most_dev *mdev = to_mdev(mbo->ifp);
+ unsigned int channel = mbo->hdm_channel_id;
+ spinlock_t *lock = mdev->channel_lock + channel;
+ unsigned long flags;
+
+ spin_lock_irqsave(lock, flags);
+
+ mbo->processed_length = 0;
+ mbo->status = MBO_E_INVAL;
+ if (likely(mdev->is_channel_healthy[channel])) {
+ switch (urb->status) {
+ case 0:
+ case -ESHUTDOWN:
+ mbo->processed_length = urb->actual_length;
+ mbo->status = MBO_SUCCESS;
+ break;
+ case -EPIPE:
+ dev_warn(&mdev->usb_device->dev,
+ "Broken pipe on ep%02x\n",
+ mdev->ep_address[channel]);
+ mdev->is_channel_healthy[channel] = false;
+ mdev->clear_work[channel].pipe = urb->pipe;
+ schedule_work(&mdev->clear_work[channel].ws);
+ break;
+ case -ENODEV:
+ case -EPROTO:
+ mbo->status = MBO_E_CLOSE;
+ break;
+ }
+ }
+
+ spin_unlock_irqrestore(lock, flags);
+
+ if (likely(mbo->complete))
+ mbo->complete(mbo);
+ usb_free_urb(urb);
+}
+
+/**
+ * hdm_read_completion - completion function for submitted Rx URBs
+ * @urb: the URB that has been completed
+ *
+ * This checks the status of the completed URB. In case the URB has been
+ * unlinked before it is immediately freed. On any other error the MBO transfer
+ * flag is set. On success it frees allocated resources, removes
+ * padding bytes -if necessary- and calls the completion function.
+ *
+ * Context: interrupt!
+ */
+static void hdm_read_completion(struct urb *urb)
+{
+ struct mbo *mbo = urb->context;
+ struct most_dev *mdev = to_mdev(mbo->ifp);
+ unsigned int channel = mbo->hdm_channel_id;
+ struct device *dev = &mdev->usb_device->dev;
+ spinlock_t *lock = mdev->channel_lock + channel;
+ unsigned long flags;
+
+ spin_lock_irqsave(lock, flags);
+
+ mbo->processed_length = 0;
+ mbo->status = MBO_E_INVAL;
+ if (likely(mdev->is_channel_healthy[channel])) {
+ switch (urb->status) {
+ case 0:
+ case -ESHUTDOWN:
+ mbo->processed_length = urb->actual_length;
+ mbo->status = MBO_SUCCESS;
+ if (mdev->padding_active[channel] &&
+ hdm_remove_padding(mdev, channel, mbo)) {
+ mbo->processed_length = 0;
+ mbo->status = MBO_E_INVAL;
+ }
+ break;
+ case -EPIPE:
+ dev_warn(dev, "Broken pipe on ep%02x\n",
+ mdev->ep_address[channel]);
+ mdev->is_channel_healthy[channel] = false;
+ mdev->clear_work[channel].pipe = urb->pipe;
+ schedule_work(&mdev->clear_work[channel].ws);
+ break;
+ case -ENODEV:
+ case -EPROTO:
+ mbo->status = MBO_E_CLOSE;
+ break;
+ case -EOVERFLOW:
+ dev_warn(dev, "Babble on ep%02x\n",
+ mdev->ep_address[channel]);
+ break;
+ }
+ }
+
+ spin_unlock_irqrestore(lock, flags);
+
+ if (likely(mbo->complete))
+ mbo->complete(mbo);
+ usb_free_urb(urb);
+}
+
+/**
+ * hdm_enqueue - receive a buffer to be used for data transfer
+ * @iface: interface to enqueue to
+ * @channel: ID of the channel
+ * @mbo: pointer to the buffer object
+ *
+ * This allocates a new URB and fills it according to the channel
+ * that is being used for transmission of data. Before the URB is
+ * submitted it is stored in the private anchor list.
+ *
+ * Returns 0 on success. On any error the URB is freed and a error code
+ * is returned.
+ *
+ * Context: Could in _some_ cases be interrupt!
+ */
+static int hdm_enqueue(struct most_interface *iface, int channel,
+ struct mbo *mbo)
+{
+ struct most_dev *mdev = to_mdev(iface);
+ struct most_channel_config *conf;
+ int retval = 0;
+ struct urb *urb;
+ unsigned long length;
+ void *virt_address;
+
+ if (!mbo)
+ return -EINVAL;
+ if (iface->num_channels <= channel || channel < 0)
+ return -ECHRNG;
+
+ urb = usb_alloc_urb(NO_ISOCHRONOUS_URB, GFP_KERNEL);
+ if (!urb)
+ return -ENOMEM;
+
+ conf = &mdev->conf[channel];
+
+ mutex_lock(&mdev->io_mutex);
+ if (!mdev->usb_device) {
+ retval = -ENODEV;
+ goto err_free_urb;
+ }
+
+ if ((conf->direction & MOST_CH_TX) && mdev->padding_active[channel] &&
+ hdm_add_padding(mdev, channel, mbo)) {
+ retval = -EINVAL;
+ goto err_free_urb;
+ }
+
+ urb->transfer_dma = mbo->bus_address;
+ virt_address = mbo->virt_address;
+ length = mbo->buffer_length;
+
+ if (conf->direction & MOST_CH_TX) {
+ usb_fill_bulk_urb(urb, mdev->usb_device,
+ usb_sndbulkpipe(mdev->usb_device,
+ mdev->ep_address[channel]),
+ virt_address,
+ length,
+ hdm_write_completion,
+ mbo);
+ if (conf->data_type != MOST_CH_ISOC &&
+ conf->data_type != MOST_CH_SYNC)
+ urb->transfer_flags |= URB_ZERO_PACKET;
+ } else {
+ usb_fill_bulk_urb(urb, mdev->usb_device,
+ usb_rcvbulkpipe(mdev->usb_device,
+ mdev->ep_address[channel]),
+ virt_address,
+ length + conf->extra_len,
+ hdm_read_completion,
+ mbo);
+ }
+ urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+
+ usb_anchor_urb(urb, &mdev->busy_urbs[channel]);
+
+ retval = usb_submit_urb(urb, GFP_KERNEL);
+ if (retval) {
+ dev_err(&mdev->usb_device->dev,
+ "URB submit failed with error %d.\n", retval);
+ goto err_unanchor_urb;
+ }
+ mutex_unlock(&mdev->io_mutex);
+ return 0;
+
+err_unanchor_urb:
+ usb_unanchor_urb(urb);
+err_free_urb:
+ usb_free_urb(urb);
+ mutex_unlock(&mdev->io_mutex);
+ return retval;
+}
+
+static void *hdm_dma_alloc(struct mbo *mbo, u32 size)
+{
+ struct most_dev *mdev = to_mdev(mbo->ifp);
+
+ return usb_alloc_coherent(mdev->usb_device, size, GFP_KERNEL,
+ &mbo->bus_address);
+}
+
+static void hdm_dma_free(struct mbo *mbo, u32 size)
+{
+ struct most_dev *mdev = to_mdev(mbo->ifp);
+
+ usb_free_coherent(mdev->usb_device, size, mbo->virt_address,
+ mbo->bus_address);
+}
+
+/**
+ * hdm_configure_channel - receive channel configuration from core
+ * @iface: interface
+ * @channel: channel ID
+ * @conf: structure that holds the configuration information
+ *
+ * The attached network interface controller (NIC) supports a padding mode
+ * to avoid short packets on USB, hence increasing the performance due to a
+ * lower interrupt load. This mode is default for synchronous data and can
+ * be switched on for isochronous data. In case padding is active the
+ * driver needs to know the frame size of the payload in order to calculate
+ * the number of bytes it needs to pad when transmitting or to cut off when
+ * receiving data.
+ *
+ */
+static int hdm_configure_channel(struct most_interface *iface, int channel,
+ struct most_channel_config *conf)
+{
+ unsigned int num_frames;
+ unsigned int frame_size;
+ struct most_dev *mdev = to_mdev(iface);
+ struct device *dev = &mdev->usb_device->dev;
+
+ if (!conf) {
+ dev_err(dev, "Bad config pointer.\n");
+ return -EINVAL;
+ }
+ if (channel < 0 || channel >= iface->num_channels) {
+ dev_err(dev, "Channel ID out of range.\n");
+ return -EINVAL;
+ }
+
+ mdev->is_channel_healthy[channel] = true;
+ mdev->clear_work[channel].channel = channel;
+ mdev->clear_work[channel].mdev = mdev;
+ INIT_WORK(&mdev->clear_work[channel].ws, wq_clear_halt);
+
+ if (!conf->num_buffers || !conf->buffer_size) {
+ dev_err(dev, "Misconfig: buffer size or #buffers zero.\n");
+ return -EINVAL;
+ }
+
+ if (conf->data_type != MOST_CH_SYNC &&
+ !(conf->data_type == MOST_CH_ISOC &&
+ conf->packets_per_xact != 0xFF)) {
+ mdev->padding_active[channel] = false;
+ /*
+ * Since the NIC's padding mode is not going to be
+ * used, we can skip the frame size calculations and
+ * move directly on to exit.
+ */
+ goto exit;
+ }
+
+ mdev->padding_active[channel] = true;
+
+ frame_size = get_stream_frame_size(&mdev->dev, conf);
+ if (frame_size == 0 || frame_size > USB_MTU) {
+ dev_warn(dev, "Misconfig: frame size wrong\n");
+ return -EINVAL;
+ }
+
+ num_frames = conf->buffer_size / frame_size;
+
+ if (conf->buffer_size % frame_size) {
+ u16 old_size = conf->buffer_size;
+
+ conf->buffer_size = num_frames * frame_size;
+ dev_warn(dev, "%s: fixed buffer size (%d -> %d)\n",
+ mdev->suffix[channel], old_size, conf->buffer_size);
+ }
+
+ /* calculate extra length to comply w/ HW padding */
+ conf->extra_len = num_frames * (USB_MTU - frame_size);
+
+exit:
+ mdev->conf[channel] = *conf;
+ if (conf->data_type == MOST_CH_ASYNC) {
+ u16 ep = mdev->ep_address[channel];
+
+ if (start_sync_ep(mdev->usb_device, ep) < 0)
+ dev_warn(dev, "sync for ep%02x failed", ep);
+ }
+ return 0;
+}
+
+/**
+ * hdm_request_netinfo - request network information
+ * @iface: pointer to interface
+ * @channel: channel ID
+ *
+ * This is used as trigger to set up the link status timer that
+ * polls for the NI state of the INIC every 2 seconds.
+ *
+ */
+static void hdm_request_netinfo(struct most_interface *iface, int channel,
+ void (*on_netinfo)(struct most_interface *,
+ unsigned char,
+ unsigned char *))
+{
+ struct most_dev *mdev = to_mdev(iface);
+
+ mdev->on_netinfo = on_netinfo;
+ if (!on_netinfo)
+ return;
+
+ mdev->link_stat_timer.expires = jiffies + HZ;
+ mod_timer(&mdev->link_stat_timer, mdev->link_stat_timer.expires);
+}
+
+/**
+ * link_stat_timer_handler - schedule work obtaining mac address and link status
+ * @data: pointer to USB device instance
+ *
+ * The handler runs in interrupt context. That's why we need to defer the
+ * tasks to a work queue.
+ */
+static void link_stat_timer_handler(struct timer_list *t)
+{
+ struct most_dev *mdev = from_timer(mdev, t, link_stat_timer);
+
+ schedule_work(&mdev->poll_work_obj);
+ mdev->link_stat_timer.expires = jiffies + (2 * HZ);
+ add_timer(&mdev->link_stat_timer);
+}
+
+/**
+ * wq_netinfo - work queue function to deliver latest networking information
+ * @wq_obj: object that holds data for our deferred work to do
+ *
+ * This retrieves the network interface status of the USB INIC
+ */
+static void wq_netinfo(struct work_struct *wq_obj)
+{
+ struct most_dev *mdev = to_mdev_from_work(wq_obj);
+ struct usb_device *usb_device = mdev->usb_device;
+ struct device *dev = &usb_device->dev;
+ u16 hi, mi, lo, link;
+ u8 hw_addr[6];
+
+ if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_HI, &hi)) {
+ dev_err(dev, "Vendor request 'hw_addr_hi' failed\n");
+ return;
+ }
+
+ if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_MI, &mi)) {
+ dev_err(dev, "Vendor request 'hw_addr_mid' failed\n");
+ return;
+ }
+
+ if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_LO, &lo)) {
+ dev_err(dev, "Vendor request 'hw_addr_low' failed\n");
+ return;
+ }
+
+ if (drci_rd_reg(usb_device, DRCI_REG_NI_STATE, &link)) {
+ dev_err(dev, "Vendor request 'link status' failed\n");
+ return;
+ }
+
+ hw_addr[0] = hi >> 8;
+ hw_addr[1] = hi;
+ hw_addr[2] = mi >> 8;
+ hw_addr[3] = mi;
+ hw_addr[4] = lo >> 8;
+ hw_addr[5] = lo;
+
+ if (mdev->on_netinfo)
+ mdev->on_netinfo(&mdev->iface, link, hw_addr);
+}
+
+/**
+ * wq_clear_halt - work queue function
+ * @wq_obj: work_struct object to execute
+ *
+ * This sends a clear_halt to the given USB pipe.
+ */
+static void wq_clear_halt(struct work_struct *wq_obj)
+{
+ struct clear_hold_work *clear_work = to_clear_hold_work(wq_obj);
+ struct most_dev *mdev = clear_work->mdev;
+ unsigned int channel = clear_work->channel;
+ int pipe = clear_work->pipe;
+ int snd_pipe;
+ int peer;
+
+ mutex_lock(&mdev->io_mutex);
+ most_stop_enqueue(&mdev->iface, channel);
+ usb_kill_anchored_urbs(&mdev->busy_urbs[channel]);
+ if (usb_clear_halt(mdev->usb_device, pipe))
+ dev_warn(&mdev->usb_device->dev, "Failed to reset endpoint.\n");
+
+ /* If the functional Stall condition has been set on an
+ * asynchronous rx channel, we need to clear the tx channel
+ * too, since the hardware runs its clean-up sequence on both
+ * channels, as they are physically one on the network.
+ *
+ * The USB interface that exposes the asynchronous channels
+ * contains always two endpoints, and two only.
+ */
+ if (mdev->conf[channel].data_type == MOST_CH_ASYNC &&
+ mdev->conf[channel].direction == MOST_CH_RX) {
+ if (channel == 0)
+ peer = 1;
+ else
+ peer = 0;
+ snd_pipe = usb_sndbulkpipe(mdev->usb_device,
+ mdev->ep_address[peer]);
+ usb_clear_halt(mdev->usb_device, snd_pipe);
+ }
+ mdev->is_channel_healthy[channel] = true;
+ most_resume_enqueue(&mdev->iface, channel);
+ mutex_unlock(&mdev->io_mutex);
+}
+
+/**
+ * hdm_usb_fops - file operation table for USB driver
+ */
+static const struct file_operations hdm_usb_fops = {
+ .owner = THIS_MODULE,
+};
+
+/**
+ * usb_device_id - ID table for HCD device probing
+ */
+static const struct usb_device_id usbid[] = {
+ { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_BRDG), },
+ { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81118), },
+ { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81119), },
+ { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81210), },
+ { } /* Terminating entry */
+};
+
+struct regs {
+ const char *name;
+ u16 reg;
+};
+
+static const struct regs ro_regs[] = {
+ { "ni_state", DRCI_REG_NI_STATE },
+ { "packet_bandwidth", DRCI_REG_PACKET_BW },
+ { "node_address", DRCI_REG_NODE_ADDR },
+ { "node_position", DRCI_REG_NODE_POS },
+};
+
+static const struct regs rw_regs[] = {
+ { "mep_filter", DRCI_REG_MEP_FILTER },
+ { "mep_hash0", DRCI_REG_HASH_TBL0 },
+ { "mep_hash1", DRCI_REG_HASH_TBL1 },
+ { "mep_hash2", DRCI_REG_HASH_TBL2 },
+ { "mep_hash3", DRCI_REG_HASH_TBL3 },
+ { "mep_eui48_hi", DRCI_REG_HW_ADDR_HI },
+ { "mep_eui48_mi", DRCI_REG_HW_ADDR_MI },
+ { "mep_eui48_lo", DRCI_REG_HW_ADDR_LO },
+};
+
+static int get_stat_reg_addr(const struct regs *regs, int size,
+ const char *name, u16 *reg_addr)
+{
+ int i;
+
+ for (i = 0; i < size; i++) {
+ if (sysfs_streq(name, regs[i].name)) {
+ *reg_addr = regs[i].reg;
+ return 0;
+ }
+ }
+ return -EINVAL;
+}
+
+#define get_static_reg_addr(regs, name, reg_addr) \
+ get_stat_reg_addr(regs, ARRAY_SIZE(regs), name, reg_addr)
+
+static ssize_t value_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ const char *name = attr->attr.name;
+ struct most_dci_obj *dci_obj = to_dci_obj(dev);
+ u16 val;
+ u16 reg_addr;
+ int err;
+
+ if (sysfs_streq(name, "arb_address"))
+ return snprintf(buf, PAGE_SIZE, "%04x\n", dci_obj->reg_addr);
+
+ if (sysfs_streq(name, "arb_value"))
+ reg_addr = dci_obj->reg_addr;
+ else if (get_static_reg_addr(ro_regs, name, ®_addr) &&
+ get_static_reg_addr(rw_regs, name, ®_addr))
+ return -EINVAL;
+
+ err = drci_rd_reg(dci_obj->usb_device, reg_addr, &val);
+ if (err < 0)
+ return err;
+
+ return snprintf(buf, PAGE_SIZE, "%04x\n", val);
+}
+
+static ssize_t value_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ u16 val;
+ u16 reg_addr;
+ const char *name = attr->attr.name;
+ struct most_dci_obj *dci_obj = to_dci_obj(dev);
+ struct usb_device *usb_dev = dci_obj->usb_device;
+ int err;
+
+ err = kstrtou16(buf, 16, &val);
+ if (err)
+ return err;
+
+ if (sysfs_streq(name, "arb_address")) {
+ dci_obj->reg_addr = val;
+ return count;
+ }
+
+ if (sysfs_streq(name, "arb_value"))
+ err = drci_wr_reg(usb_dev, dci_obj->reg_addr, val);
+ else if (sysfs_streq(name, "sync_ep"))
+ err = start_sync_ep(usb_dev, val);
+ else if (!get_static_reg_addr(rw_regs, name, ®_addr))
+ err = drci_wr_reg(usb_dev, reg_addr, val);
+ else
+ return -EINVAL;
+
+ if (err < 0)
+ return err;
+
+ return count;
+}
+
+static DEVICE_ATTR(ni_state, 0444, value_show, NULL);
+static DEVICE_ATTR(packet_bandwidth, 0444, value_show, NULL);
+static DEVICE_ATTR(node_address, 0444, value_show, NULL);
+static DEVICE_ATTR(node_position, 0444, value_show, NULL);
+static DEVICE_ATTR(sync_ep, 0200, NULL, value_store);
+static DEVICE_ATTR(mep_filter, 0644, value_show, value_store);
+static DEVICE_ATTR(mep_hash0, 0644, value_show, value_store);
+static DEVICE_ATTR(mep_hash1, 0644, value_show, value_store);
+static DEVICE_ATTR(mep_hash2, 0644, value_show, value_store);
+static DEVICE_ATTR(mep_hash3, 0644, value_show, value_store);
+static DEVICE_ATTR(mep_eui48_hi, 0644, value_show, value_store);
+static DEVICE_ATTR(mep_eui48_mi, 0644, value_show, value_store);
+static DEVICE_ATTR(mep_eui48_lo, 0644, value_show, value_store);
+static DEVICE_ATTR(arb_address, 0644, value_show, value_store);
+static DEVICE_ATTR(arb_value, 0644, value_show, value_store);
+
+static struct attribute *dci_attrs[] = {
+ &dev_attr_ni_state.attr,
+ &dev_attr_packet_bandwidth.attr,
+ &dev_attr_node_address.attr,
+ &dev_attr_node_position.attr,
+ &dev_attr_sync_ep.attr,
+ &dev_attr_mep_filter.attr,
+ &dev_attr_mep_hash0.attr,
+ &dev_attr_mep_hash1.attr,
+ &dev_attr_mep_hash2.attr,
+ &dev_attr_mep_hash3.attr,
+ &dev_attr_mep_eui48_hi.attr,
+ &dev_attr_mep_eui48_mi.attr,
+ &dev_attr_mep_eui48_lo.attr,
+ &dev_attr_arb_address.attr,
+ &dev_attr_arb_value.attr,
+ NULL,
+};
+
+ATTRIBUTE_GROUPS(dci);
+
+static void release_dci(struct device *dev)
+{
+ struct most_dci_obj *dci = to_dci_obj(dev);
+
+ put_device(dev->parent);
+ kfree(dci);
+}
+
+static void release_mdev(struct device *dev)
+{
+ struct most_dev *mdev = to_mdev_from_dev(dev);
+
+ kfree(mdev);
+}
+/**
+ * hdm_probe - probe function of USB device driver
+ * @interface: Interface of the attached USB device
+ * @id: Pointer to the USB ID table.
+ *
+ * This allocates and initializes the device instance, adds the new
+ * entry to the internal list, scans the USB descriptors and registers
+ * the interface with the core.
+ * Additionally, the DCI objects are created and the hardware is sync'd.
+ *
+ * Return 0 on success. In case of an error a negative number is returned.
+ */
+static int
+hdm_probe(struct usb_interface *interface, const struct usb_device_id *id)
+{
+ struct usb_host_interface *usb_iface_desc = interface->cur_altsetting;
+ struct usb_device *usb_dev = interface_to_usbdev(interface);
+ struct device *dev = &usb_dev->dev;
+ struct most_dev *mdev;
+ unsigned int i;
+ unsigned int num_endpoints;
+ struct most_channel_capability *tmp_cap;
+ struct usb_endpoint_descriptor *ep_desc;
+ int ret = -ENOMEM;
+
+ mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
+ if (!mdev)
+ return -ENOMEM;
+
+ usb_set_intfdata(interface, mdev);
+ num_endpoints = usb_iface_desc->desc.bNumEndpoints;
+ if (num_endpoints > MAX_NUM_ENDPOINTS) {
+ kfree(mdev);
+ return -EINVAL;
+ }
+ mutex_init(&mdev->io_mutex);
+ INIT_WORK(&mdev->poll_work_obj, wq_netinfo);
+ timer_setup(&mdev->link_stat_timer, link_stat_timer_handler, 0);
+
+ mdev->usb_device = usb_dev;
+ mdev->link_stat_timer.expires = jiffies + (2 * HZ);
+
+ mdev->iface.mod = hdm_usb_fops.owner;
+ mdev->iface.dev = &mdev->dev;
+ mdev->iface.driver_dev = &interface->dev;
+ mdev->iface.interface = ITYPE_USB;
+ mdev->iface.configure = hdm_configure_channel;
+ mdev->iface.request_netinfo = hdm_request_netinfo;
+ mdev->iface.enqueue = hdm_enqueue;
+ mdev->iface.poison_channel = hdm_poison_channel;
+ mdev->iface.dma_alloc = hdm_dma_alloc;
+ mdev->iface.dma_free = hdm_dma_free;
+ mdev->iface.description = mdev->description;
+ mdev->iface.num_channels = num_endpoints;
+
+ snprintf(mdev->description, sizeof(mdev->description),
+ "%d-%s:%d.%d",
+ usb_dev->bus->busnum,
+ usb_dev->devpath,
+ usb_dev->config->desc.bConfigurationValue,
+ usb_iface_desc->desc.bInterfaceNumber);
+
+ mdev->dev.init_name = mdev->description;
+ mdev->dev.parent = &interface->dev;
+ mdev->dev.release = release_mdev;
+ mdev->conf = kcalloc(num_endpoints, sizeof(*mdev->conf), GFP_KERNEL);
+ if (!mdev->conf)
+ goto err_free_mdev;
+
+ mdev->cap = kcalloc(num_endpoints, sizeof(*mdev->cap), GFP_KERNEL);
+ if (!mdev->cap)
+ goto err_free_conf;
+
+ mdev->iface.channel_vector = mdev->cap;
+ mdev->ep_address =
+ kcalloc(num_endpoints, sizeof(*mdev->ep_address), GFP_KERNEL);
+ if (!mdev->ep_address)
+ goto err_free_cap;
+
+ mdev->busy_urbs =
+ kcalloc(num_endpoints, sizeof(*mdev->busy_urbs), GFP_KERNEL);
+ if (!mdev->busy_urbs)
+ goto err_free_ep_address;
+
+ tmp_cap = mdev->cap;
+ for (i = 0; i < num_endpoints; i++) {
+ ep_desc = &usb_iface_desc->endpoint[i].desc;
+ mdev->ep_address[i] = ep_desc->bEndpointAddress;
+ mdev->padding_active[i] = false;
+ mdev->is_channel_healthy[i] = true;
+
+ snprintf(&mdev->suffix[i][0], MAX_SUFFIX_LEN, "ep%02x",
+ mdev->ep_address[i]);
+
+ tmp_cap->name_suffix = &mdev->suffix[i][0];
+ tmp_cap->buffer_size_packet = MAX_BUF_SIZE;
+ tmp_cap->buffer_size_streaming = MAX_BUF_SIZE;
+ tmp_cap->num_buffers_packet = BUF_CHAIN_SIZE;
+ tmp_cap->num_buffers_streaming = BUF_CHAIN_SIZE;
+ tmp_cap->data_type = MOST_CH_CONTROL | MOST_CH_ASYNC |
+ MOST_CH_ISOC | MOST_CH_SYNC;
+ if (usb_endpoint_dir_in(ep_desc))
+ tmp_cap->direction = MOST_CH_RX;
+ else
+ tmp_cap->direction = MOST_CH_TX;
+ tmp_cap++;
+ init_usb_anchor(&mdev->busy_urbs[i]);
+ spin_lock_init(&mdev->channel_lock[i]);
+ }
+ dev_dbg(dev, "claimed gadget: Vendor=%4.4x ProdID=%4.4x Bus=%02x Device=%02x\n",
+ le16_to_cpu(usb_dev->descriptor.idVendor),
+ le16_to_cpu(usb_dev->descriptor.idProduct),
+ usb_dev->bus->busnum,
+ usb_dev->devnum);
+
+ dev_dbg(dev, "device path: /sys/bus/usb/devices/%d-%s:%d.%d\n",
+ usb_dev->bus->busnum,
+ usb_dev->devpath,
+ usb_dev->config->desc.bConfigurationValue,
+ usb_iface_desc->desc.bInterfaceNumber);
+
+ ret = most_register_interface(&mdev->iface);
+ if (ret)
+ goto err_free_busy_urbs;
+
+ mutex_lock(&mdev->io_mutex);
+ if (le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81118 ||
+ le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81119 ||
+ le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81210) {
+ mdev->dci = kzalloc(sizeof(*mdev->dci), GFP_KERNEL);
+ if (!mdev->dci) {
+ mutex_unlock(&mdev->io_mutex);
+ most_deregister_interface(&mdev->iface);
+ ret = -ENOMEM;
+ goto err_free_busy_urbs;
+ }
+
+ mdev->dci->dev.init_name = "dci";
+ mdev->dci->dev.parent = get_device(mdev->iface.dev);
+ mdev->dci->dev.groups = dci_groups;
+ mdev->dci->dev.release = release_dci;
+ if (device_register(&mdev->dci->dev)) {
+ mutex_unlock(&mdev->io_mutex);
+ most_deregister_interface(&mdev->iface);
+ ret = -ENOMEM;
+ goto err_free_dci;
+ }
+ mdev->dci->usb_device = mdev->usb_device;
+ }
+ mutex_unlock(&mdev->io_mutex);
+ return 0;
+err_free_dci:
+ put_device(&mdev->dci->dev);
+err_free_busy_urbs:
+ kfree(mdev->busy_urbs);
+err_free_ep_address:
+ kfree(mdev->ep_address);
+err_free_cap:
+ kfree(mdev->cap);
+err_free_conf:
+ kfree(mdev->conf);
+err_free_mdev:
+ put_device(&mdev->dev);
+ return ret;
+}
+
+/**
+ * hdm_disconnect - disconnect function of USB device driver
+ * @interface: Interface of the attached USB device
+ *
+ * This deregisters the interface with the core, removes the kernel timer
+ * and frees resources.
+ *
+ * Context: hub kernel thread
+ */
+static void hdm_disconnect(struct usb_interface *interface)
+{
+ struct most_dev *mdev = usb_get_intfdata(interface);
+
+ mutex_lock(&mdev->io_mutex);
+ usb_set_intfdata(interface, NULL);
+ mdev->usb_device = NULL;
+ mutex_unlock(&mdev->io_mutex);
+
+ del_timer_sync(&mdev->link_stat_timer);
+ cancel_work_sync(&mdev->poll_work_obj);
+
+ if (mdev->dci)
+ device_unregister(&mdev->dci->dev);
+ most_deregister_interface(&mdev->iface);
+
+ kfree(mdev->busy_urbs);
+ kfree(mdev->cap);
+ kfree(mdev->conf);
+ kfree(mdev->ep_address);
+ put_device(&mdev->dci->dev);
+ put_device(&mdev->dev);
+}
+
+static int hdm_suspend(struct usb_interface *interface, pm_message_t message)
+{
+ struct most_dev *mdev = usb_get_intfdata(interface);
+ int i;
+
+ mutex_lock(&mdev->io_mutex);
+ for (i = 0; i < mdev->iface.num_channels; i++) {
+ most_stop_enqueue(&mdev->iface, i);
+ usb_kill_anchored_urbs(&mdev->busy_urbs[i]);
+ }
+ mutex_unlock(&mdev->io_mutex);
+ return 0;
+}
+
+static int hdm_resume(struct usb_interface *interface)
+{
+ struct most_dev *mdev = usb_get_intfdata(interface);
+ int i;
+
+ mutex_lock(&mdev->io_mutex);
+ for (i = 0; i < mdev->iface.num_channels; i++)
+ most_resume_enqueue(&mdev->iface, i);
+ mutex_unlock(&mdev->io_mutex);
+ return 0;
+}
+
+static struct usb_driver hdm_usb = {
+ .name = "hdm_usb",
+ .id_table = usbid,
+ .probe = hdm_probe,
+ .disconnect = hdm_disconnect,
+ .resume = hdm_resume,
+ .suspend = hdm_suspend,
+};
+
+module_usb_driver(hdm_usb);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>");
+MODULE_DESCRIPTION("HDM_4_USB");