v4.19.13 snapshot.
diff --git a/drivers/hsi/clients/Kconfig b/drivers/hsi/clients/Kconfig
new file mode 100644
index 0000000..d612620
--- /dev/null
+++ b/drivers/hsi/clients/Kconfig
@@ -0,0 +1,40 @@
+#
+# HSI clients configuration
+#
+
+comment "HSI clients"
+
+config NOKIA_MODEM
+ tristate "Nokia Modem"
+ depends on HSI && SSI_PROTOCOL && CMT_SPEECH
+ help
+ Say Y here if you want to add support for the modem on Nokia
+ N900 (Nokia RX-51) hardware.
+
+ If unsure, say N.
+
+config CMT_SPEECH
+ tristate "CMT speech"
+ depends on HSI && SSI_PROTOCOL
+ help
+ If you say Y here, you will enable the CMT speech protocol used
+ by Nokia modems. If you say M the protocol will be available as
+ module named cmt_speech.
+
+ If unsure, say N.
+
+config SSI_PROTOCOL
+ tristate "SSI protocol"
+ depends on HSI && PHONET && OMAP_SSI
+ help
+ If you say Y here, you will enable the SSI protocol aka McSAAB.
+
+ If unsure, say N.
+
+config HSI_CHAR
+ tristate "HSI/SSI character driver"
+ depends on HSI
+ ---help---
+ If you say Y here, you will enable the HSI/SSI character driver.
+ This driver provides a simple character device interface for
+ serial communication with the cellular modem over HSI/SSI bus.
diff --git a/drivers/hsi/clients/Makefile b/drivers/hsi/clients/Makefile
new file mode 100644
index 0000000..2607232
--- /dev/null
+++ b/drivers/hsi/clients/Makefile
@@ -0,0 +1,8 @@
+#
+# Makefile for HSI clients
+#
+
+obj-$(CONFIG_NOKIA_MODEM) += nokia-modem.o
+obj-$(CONFIG_SSI_PROTOCOL) += ssi_protocol.o
+obj-$(CONFIG_CMT_SPEECH) += cmt_speech.o
+obj-$(CONFIG_HSI_CHAR) += hsi_char.o
diff --git a/drivers/hsi/clients/cmt_speech.c b/drivers/hsi/clients/cmt_speech.c
new file mode 100644
index 0000000..a1d4b93
--- /dev/null
+++ b/drivers/hsi/clients/cmt_speech.c
@@ -0,0 +1,1462 @@
+/*
+ * cmt_speech.c - HSI CMT speech driver
+ *
+ * Copyright (C) 2008,2009,2010 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Kai Vehmanen <kai.vehmanen@nokia.com>
+ * Original author: Peter Ujfalusi <peter.ujfalusi@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/miscdevice.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/poll.h>
+#include <linux/sched/signal.h>
+#include <linux/ioctl.h>
+#include <linux/uaccess.h>
+#include <linux/pm_qos.h>
+#include <linux/hsi/hsi.h>
+#include <linux/hsi/ssi_protocol.h>
+#include <linux/hsi/cs-protocol.h>
+
+#define CS_MMAP_SIZE PAGE_SIZE
+
+struct char_queue {
+ struct list_head list;
+ u32 msg;
+};
+
+struct cs_char {
+ unsigned int opened;
+ struct hsi_client *cl;
+ struct cs_hsi_iface *hi;
+ struct list_head chardev_queue;
+ struct list_head dataind_queue;
+ int dataind_pending;
+ /* mmap things */
+ unsigned long mmap_base;
+ unsigned long mmap_size;
+ spinlock_t lock;
+ struct fasync_struct *async_queue;
+ wait_queue_head_t wait;
+ /* hsi channel ids */
+ int channel_id_cmd;
+ int channel_id_data;
+};
+
+#define SSI_CHANNEL_STATE_READING 1
+#define SSI_CHANNEL_STATE_WRITING (1 << 1)
+#define SSI_CHANNEL_STATE_POLL (1 << 2)
+#define SSI_CHANNEL_STATE_ERROR (1 << 3)
+
+#define TARGET_MASK 0xf000000
+#define TARGET_REMOTE (1 << CS_DOMAIN_SHIFT)
+#define TARGET_LOCAL 0
+
+/* Number of pre-allocated commands buffers */
+#define CS_MAX_CMDS 4
+
+/*
+ * During data transfers, transactions must be handled
+ * within 20ms (fixed value in cmtspeech HSI protocol)
+ */
+#define CS_QOS_LATENCY_FOR_DATA_USEC 20000
+
+/* Timeout to wait for pending HSI transfers to complete */
+#define CS_HSI_TRANSFER_TIMEOUT_MS 500
+
+
+#define RX_PTR_BOUNDARY_SHIFT 8
+#define RX_PTR_MAX_SHIFT (RX_PTR_BOUNDARY_SHIFT + \
+ CS_MAX_BUFFERS_SHIFT)
+struct cs_hsi_iface {
+ struct hsi_client *cl;
+ struct hsi_client *master;
+
+ unsigned int iface_state;
+ unsigned int wakeline_state;
+ unsigned int control_state;
+ unsigned int data_state;
+
+ /* state exposed to application */
+ struct cs_mmap_config_block *mmap_cfg;
+
+ unsigned long mmap_base;
+ unsigned long mmap_size;
+
+ unsigned int rx_slot;
+ unsigned int tx_slot;
+
+ /* note: for security reasons, we do not trust the contents of
+ * mmap_cfg, but instead duplicate the variables here */
+ unsigned int buf_size;
+ unsigned int rx_bufs;
+ unsigned int tx_bufs;
+ unsigned int rx_ptr_boundary;
+ unsigned int rx_offsets[CS_MAX_BUFFERS];
+ unsigned int tx_offsets[CS_MAX_BUFFERS];
+
+ /* size of aligned memory blocks */
+ unsigned int slot_size;
+ unsigned int flags;
+
+ struct list_head cmdqueue;
+
+ struct hsi_msg *data_rx_msg;
+ struct hsi_msg *data_tx_msg;
+ wait_queue_head_t datawait;
+
+ struct pm_qos_request pm_qos_req;
+
+ spinlock_t lock;
+};
+
+static struct cs_char cs_char_data;
+
+static void cs_hsi_read_on_control(struct cs_hsi_iface *hi);
+static void cs_hsi_read_on_data(struct cs_hsi_iface *hi);
+
+static inline void rx_ptr_shift_too_big(void)
+{
+ BUILD_BUG_ON((1LLU << RX_PTR_MAX_SHIFT) > UINT_MAX);
+}
+
+static void cs_notify(u32 message, struct list_head *head)
+{
+ struct char_queue *entry;
+
+ spin_lock(&cs_char_data.lock);
+
+ if (!cs_char_data.opened) {
+ spin_unlock(&cs_char_data.lock);
+ goto out;
+ }
+
+ entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
+ if (!entry) {
+ dev_err(&cs_char_data.cl->device,
+ "Can't allocate new entry for the queue.\n");
+ spin_unlock(&cs_char_data.lock);
+ goto out;
+ }
+
+ entry->msg = message;
+ list_add_tail(&entry->list, head);
+
+ spin_unlock(&cs_char_data.lock);
+
+ wake_up_interruptible(&cs_char_data.wait);
+ kill_fasync(&cs_char_data.async_queue, SIGIO, POLL_IN);
+
+out:
+ return;
+}
+
+static u32 cs_pop_entry(struct list_head *head)
+{
+ struct char_queue *entry;
+ u32 data;
+
+ entry = list_entry(head->next, struct char_queue, list);
+ data = entry->msg;
+ list_del(&entry->list);
+ kfree(entry);
+
+ return data;
+}
+
+static void cs_notify_control(u32 message)
+{
+ cs_notify(message, &cs_char_data.chardev_queue);
+}
+
+static void cs_notify_data(u32 message, int maxlength)
+{
+ cs_notify(message, &cs_char_data.dataind_queue);
+
+ spin_lock(&cs_char_data.lock);
+ cs_char_data.dataind_pending++;
+ while (cs_char_data.dataind_pending > maxlength &&
+ !list_empty(&cs_char_data.dataind_queue)) {
+ dev_dbg(&cs_char_data.cl->device, "data notification "
+ "queue overrun (%u entries)\n", cs_char_data.dataind_pending);
+
+ cs_pop_entry(&cs_char_data.dataind_queue);
+ cs_char_data.dataind_pending--;
+ }
+ spin_unlock(&cs_char_data.lock);
+}
+
+static inline void cs_set_cmd(struct hsi_msg *msg, u32 cmd)
+{
+ u32 *data = sg_virt(msg->sgt.sgl);
+ *data = cmd;
+}
+
+static inline u32 cs_get_cmd(struct hsi_msg *msg)
+{
+ u32 *data = sg_virt(msg->sgt.sgl);
+ return *data;
+}
+
+static void cs_release_cmd(struct hsi_msg *msg)
+{
+ struct cs_hsi_iface *hi = msg->context;
+
+ list_add_tail(&msg->link, &hi->cmdqueue);
+}
+
+static void cs_cmd_destructor(struct hsi_msg *msg)
+{
+ struct cs_hsi_iface *hi = msg->context;
+
+ spin_lock(&hi->lock);
+
+ dev_dbg(&cs_char_data.cl->device, "control cmd destructor\n");
+
+ if (hi->iface_state != CS_STATE_CLOSED)
+ dev_err(&hi->cl->device, "Cmd flushed while driver active\n");
+
+ if (msg->ttype == HSI_MSG_READ)
+ hi->control_state &=
+ ~(SSI_CHANNEL_STATE_POLL | SSI_CHANNEL_STATE_READING);
+ else if (msg->ttype == HSI_MSG_WRITE &&
+ hi->control_state & SSI_CHANNEL_STATE_WRITING)
+ hi->control_state &= ~SSI_CHANNEL_STATE_WRITING;
+
+ cs_release_cmd(msg);
+
+ spin_unlock(&hi->lock);
+}
+
+static struct hsi_msg *cs_claim_cmd(struct cs_hsi_iface* ssi)
+{
+ struct hsi_msg *msg;
+
+ BUG_ON(list_empty(&ssi->cmdqueue));
+
+ msg = list_first_entry(&ssi->cmdqueue, struct hsi_msg, link);
+ list_del(&msg->link);
+ msg->destructor = cs_cmd_destructor;
+
+ return msg;
+}
+
+static void cs_free_cmds(struct cs_hsi_iface *ssi)
+{
+ struct hsi_msg *msg, *tmp;
+
+ list_for_each_entry_safe(msg, tmp, &ssi->cmdqueue, link) {
+ list_del(&msg->link);
+ msg->destructor = NULL;
+ kfree(sg_virt(msg->sgt.sgl));
+ hsi_free_msg(msg);
+ }
+}
+
+static int cs_alloc_cmds(struct cs_hsi_iface *hi)
+{
+ struct hsi_msg *msg;
+ u32 *buf;
+ unsigned int i;
+
+ INIT_LIST_HEAD(&hi->cmdqueue);
+
+ for (i = 0; i < CS_MAX_CMDS; i++) {
+ msg = hsi_alloc_msg(1, GFP_KERNEL);
+ if (!msg)
+ goto out;
+ buf = kmalloc(sizeof(*buf), GFP_KERNEL);
+ if (!buf) {
+ hsi_free_msg(msg);
+ goto out;
+ }
+ sg_init_one(msg->sgt.sgl, buf, sizeof(*buf));
+ msg->channel = cs_char_data.channel_id_cmd;
+ msg->context = hi;
+ list_add_tail(&msg->link, &hi->cmdqueue);
+ }
+
+ return 0;
+
+out:
+ cs_free_cmds(hi);
+ return -ENOMEM;
+}
+
+static void cs_hsi_data_destructor(struct hsi_msg *msg)
+{
+ struct cs_hsi_iface *hi = msg->context;
+ const char *dir = (msg->ttype == HSI_MSG_READ) ? "TX" : "RX";
+
+ dev_dbg(&cs_char_data.cl->device, "Freeing data %s message\n", dir);
+
+ spin_lock(&hi->lock);
+ if (hi->iface_state != CS_STATE_CLOSED)
+ dev_err(&cs_char_data.cl->device,
+ "Data %s flush while device active\n", dir);
+ if (msg->ttype == HSI_MSG_READ)
+ hi->data_state &=
+ ~(SSI_CHANNEL_STATE_POLL | SSI_CHANNEL_STATE_READING);
+ else
+ hi->data_state &= ~SSI_CHANNEL_STATE_WRITING;
+
+ msg->status = HSI_STATUS_COMPLETED;
+ if (unlikely(waitqueue_active(&hi->datawait)))
+ wake_up_interruptible(&hi->datawait);
+
+ spin_unlock(&hi->lock);
+}
+
+static int cs_hsi_alloc_data(struct cs_hsi_iface *hi)
+{
+ struct hsi_msg *txmsg, *rxmsg;
+ int res = 0;
+
+ rxmsg = hsi_alloc_msg(1, GFP_KERNEL);
+ if (!rxmsg) {
+ res = -ENOMEM;
+ goto out1;
+ }
+ rxmsg->channel = cs_char_data.channel_id_data;
+ rxmsg->destructor = cs_hsi_data_destructor;
+ rxmsg->context = hi;
+
+ txmsg = hsi_alloc_msg(1, GFP_KERNEL);
+ if (!txmsg) {
+ res = -ENOMEM;
+ goto out2;
+ }
+ txmsg->channel = cs_char_data.channel_id_data;
+ txmsg->destructor = cs_hsi_data_destructor;
+ txmsg->context = hi;
+
+ hi->data_rx_msg = rxmsg;
+ hi->data_tx_msg = txmsg;
+
+ return 0;
+
+out2:
+ hsi_free_msg(rxmsg);
+out1:
+ return res;
+}
+
+static void cs_hsi_free_data_msg(struct hsi_msg *msg)
+{
+ WARN_ON(msg->status != HSI_STATUS_COMPLETED &&
+ msg->status != HSI_STATUS_ERROR);
+ hsi_free_msg(msg);
+}
+
+static void cs_hsi_free_data(struct cs_hsi_iface *hi)
+{
+ cs_hsi_free_data_msg(hi->data_rx_msg);
+ cs_hsi_free_data_msg(hi->data_tx_msg);
+}
+
+static inline void __cs_hsi_error_pre(struct cs_hsi_iface *hi,
+ struct hsi_msg *msg, const char *info,
+ unsigned int *state)
+{
+ spin_lock(&hi->lock);
+ dev_err(&hi->cl->device, "HSI %s error, msg %d, state %u\n",
+ info, msg->status, *state);
+}
+
+static inline void __cs_hsi_error_post(struct cs_hsi_iface *hi)
+{
+ spin_unlock(&hi->lock);
+}
+
+static inline void __cs_hsi_error_read_bits(unsigned int *state)
+{
+ *state |= SSI_CHANNEL_STATE_ERROR;
+ *state &= ~(SSI_CHANNEL_STATE_READING | SSI_CHANNEL_STATE_POLL);
+}
+
+static inline void __cs_hsi_error_write_bits(unsigned int *state)
+{
+ *state |= SSI_CHANNEL_STATE_ERROR;
+ *state &= ~SSI_CHANNEL_STATE_WRITING;
+}
+
+static void cs_hsi_control_read_error(struct cs_hsi_iface *hi,
+ struct hsi_msg *msg)
+{
+ __cs_hsi_error_pre(hi, msg, "control read", &hi->control_state);
+ cs_release_cmd(msg);
+ __cs_hsi_error_read_bits(&hi->control_state);
+ __cs_hsi_error_post(hi);
+}
+
+static void cs_hsi_control_write_error(struct cs_hsi_iface *hi,
+ struct hsi_msg *msg)
+{
+ __cs_hsi_error_pre(hi, msg, "control write", &hi->control_state);
+ cs_release_cmd(msg);
+ __cs_hsi_error_write_bits(&hi->control_state);
+ __cs_hsi_error_post(hi);
+
+}
+
+static void cs_hsi_data_read_error(struct cs_hsi_iface *hi, struct hsi_msg *msg)
+{
+ __cs_hsi_error_pre(hi, msg, "data read", &hi->data_state);
+ __cs_hsi_error_read_bits(&hi->data_state);
+ __cs_hsi_error_post(hi);
+}
+
+static void cs_hsi_data_write_error(struct cs_hsi_iface *hi,
+ struct hsi_msg *msg)
+{
+ __cs_hsi_error_pre(hi, msg, "data write", &hi->data_state);
+ __cs_hsi_error_write_bits(&hi->data_state);
+ __cs_hsi_error_post(hi);
+}
+
+static void cs_hsi_read_on_control_complete(struct hsi_msg *msg)
+{
+ u32 cmd = cs_get_cmd(msg);
+ struct cs_hsi_iface *hi = msg->context;
+
+ spin_lock(&hi->lock);
+ hi->control_state &= ~SSI_CHANNEL_STATE_READING;
+ if (msg->status == HSI_STATUS_ERROR) {
+ dev_err(&hi->cl->device, "Control RX error detected\n");
+ spin_unlock(&hi->lock);
+ cs_hsi_control_read_error(hi, msg);
+ goto out;
+ }
+ dev_dbg(&hi->cl->device, "Read on control: %08X\n", cmd);
+ cs_release_cmd(msg);
+ if (hi->flags & CS_FEAT_TSTAMP_RX_CTRL) {
+ struct timespec64 tspec;
+ struct cs_timestamp *tstamp =
+ &hi->mmap_cfg->tstamp_rx_ctrl;
+
+ ktime_get_ts64(&tspec);
+
+ tstamp->tv_sec = (__u32) tspec.tv_sec;
+ tstamp->tv_nsec = (__u32) tspec.tv_nsec;
+ }
+ spin_unlock(&hi->lock);
+
+ cs_notify_control(cmd);
+
+out:
+ cs_hsi_read_on_control(hi);
+}
+
+static void cs_hsi_peek_on_control_complete(struct hsi_msg *msg)
+{
+ struct cs_hsi_iface *hi = msg->context;
+ int ret;
+
+ if (msg->status == HSI_STATUS_ERROR) {
+ dev_err(&hi->cl->device, "Control peek RX error detected\n");
+ cs_hsi_control_read_error(hi, msg);
+ return;
+ }
+
+ WARN_ON(!(hi->control_state & SSI_CHANNEL_STATE_READING));
+
+ dev_dbg(&hi->cl->device, "Peek on control complete, reading\n");
+ msg->sgt.nents = 1;
+ msg->complete = cs_hsi_read_on_control_complete;
+ ret = hsi_async_read(hi->cl, msg);
+ if (ret)
+ cs_hsi_control_read_error(hi, msg);
+}
+
+static void cs_hsi_read_on_control(struct cs_hsi_iface *hi)
+{
+ struct hsi_msg *msg;
+ int ret;
+
+ spin_lock(&hi->lock);
+ if (hi->control_state & SSI_CHANNEL_STATE_READING) {
+ dev_err(&hi->cl->device, "Control read already pending (%d)\n",
+ hi->control_state);
+ spin_unlock(&hi->lock);
+ return;
+ }
+ if (hi->control_state & SSI_CHANNEL_STATE_ERROR) {
+ dev_err(&hi->cl->device, "Control read error (%d)\n",
+ hi->control_state);
+ spin_unlock(&hi->lock);
+ return;
+ }
+ hi->control_state |= SSI_CHANNEL_STATE_READING;
+ dev_dbg(&hi->cl->device, "Issuing RX on control\n");
+ msg = cs_claim_cmd(hi);
+ spin_unlock(&hi->lock);
+
+ msg->sgt.nents = 0;
+ msg->complete = cs_hsi_peek_on_control_complete;
+ ret = hsi_async_read(hi->cl, msg);
+ if (ret)
+ cs_hsi_control_read_error(hi, msg);
+}
+
+static void cs_hsi_write_on_control_complete(struct hsi_msg *msg)
+{
+ struct cs_hsi_iface *hi = msg->context;
+ if (msg->status == HSI_STATUS_COMPLETED) {
+ spin_lock(&hi->lock);
+ hi->control_state &= ~SSI_CHANNEL_STATE_WRITING;
+ cs_release_cmd(msg);
+ spin_unlock(&hi->lock);
+ } else if (msg->status == HSI_STATUS_ERROR) {
+ cs_hsi_control_write_error(hi, msg);
+ } else {
+ dev_err(&hi->cl->device,
+ "unexpected status in control write callback %d\n",
+ msg->status);
+ }
+}
+
+static int cs_hsi_write_on_control(struct cs_hsi_iface *hi, u32 message)
+{
+ struct hsi_msg *msg;
+ int ret;
+
+ spin_lock(&hi->lock);
+ if (hi->control_state & SSI_CHANNEL_STATE_ERROR) {
+ spin_unlock(&hi->lock);
+ return -EIO;
+ }
+ if (hi->control_state & SSI_CHANNEL_STATE_WRITING) {
+ dev_err(&hi->cl->device,
+ "Write still pending on control channel.\n");
+ spin_unlock(&hi->lock);
+ return -EBUSY;
+ }
+ hi->control_state |= SSI_CHANNEL_STATE_WRITING;
+ msg = cs_claim_cmd(hi);
+ spin_unlock(&hi->lock);
+
+ cs_set_cmd(msg, message);
+ msg->sgt.nents = 1;
+ msg->complete = cs_hsi_write_on_control_complete;
+ dev_dbg(&hi->cl->device,
+ "Sending control message %08X\n", message);
+ ret = hsi_async_write(hi->cl, msg);
+ if (ret) {
+ dev_err(&hi->cl->device,
+ "async_write failed with %d\n", ret);
+ cs_hsi_control_write_error(hi, msg);
+ }
+
+ /*
+ * Make sure control read is always pending when issuing
+ * new control writes. This is needed as the controller
+ * may flush our messages if e.g. the peer device reboots
+ * unexpectedly (and we cannot directly resubmit a new read from
+ * the message destructor; see cs_cmd_destructor()).
+ */
+ if (!(hi->control_state & SSI_CHANNEL_STATE_READING)) {
+ dev_err(&hi->cl->device, "Restarting control reads\n");
+ cs_hsi_read_on_control(hi);
+ }
+
+ return 0;
+}
+
+static void cs_hsi_read_on_data_complete(struct hsi_msg *msg)
+{
+ struct cs_hsi_iface *hi = msg->context;
+ u32 payload;
+
+ if (unlikely(msg->status == HSI_STATUS_ERROR)) {
+ cs_hsi_data_read_error(hi, msg);
+ return;
+ }
+
+ spin_lock(&hi->lock);
+ WARN_ON(!(hi->data_state & SSI_CHANNEL_STATE_READING));
+ hi->data_state &= ~SSI_CHANNEL_STATE_READING;
+ payload = CS_RX_DATA_RECEIVED;
+ payload |= hi->rx_slot;
+ hi->rx_slot++;
+ hi->rx_slot %= hi->rx_ptr_boundary;
+ /* expose current rx ptr in mmap area */
+ hi->mmap_cfg->rx_ptr = hi->rx_slot;
+ if (unlikely(waitqueue_active(&hi->datawait)))
+ wake_up_interruptible(&hi->datawait);
+ spin_unlock(&hi->lock);
+
+ cs_notify_data(payload, hi->rx_bufs);
+ cs_hsi_read_on_data(hi);
+}
+
+static void cs_hsi_peek_on_data_complete(struct hsi_msg *msg)
+{
+ struct cs_hsi_iface *hi = msg->context;
+ u32 *address;
+ int ret;
+
+ if (unlikely(msg->status == HSI_STATUS_ERROR)) {
+ cs_hsi_data_read_error(hi, msg);
+ return;
+ }
+ if (unlikely(hi->iface_state != CS_STATE_CONFIGURED)) {
+ dev_err(&hi->cl->device, "Data received in invalid state\n");
+ cs_hsi_data_read_error(hi, msg);
+ return;
+ }
+
+ spin_lock(&hi->lock);
+ WARN_ON(!(hi->data_state & SSI_CHANNEL_STATE_POLL));
+ hi->data_state &= ~SSI_CHANNEL_STATE_POLL;
+ hi->data_state |= SSI_CHANNEL_STATE_READING;
+ spin_unlock(&hi->lock);
+
+ address = (u32 *)(hi->mmap_base +
+ hi->rx_offsets[hi->rx_slot % hi->rx_bufs]);
+ sg_init_one(msg->sgt.sgl, address, hi->buf_size);
+ msg->sgt.nents = 1;
+ msg->complete = cs_hsi_read_on_data_complete;
+ ret = hsi_async_read(hi->cl, msg);
+ if (ret)
+ cs_hsi_data_read_error(hi, msg);
+}
+
+/*
+ * Read/write transaction is ongoing. Returns false if in
+ * SSI_CHANNEL_STATE_POLL state.
+ */
+static inline int cs_state_xfer_active(unsigned int state)
+{
+ return (state & SSI_CHANNEL_STATE_WRITING) ||
+ (state & SSI_CHANNEL_STATE_READING);
+}
+
+/*
+ * No pending read/writes
+ */
+static inline int cs_state_idle(unsigned int state)
+{
+ return !(state & ~SSI_CHANNEL_STATE_ERROR);
+}
+
+static void cs_hsi_read_on_data(struct cs_hsi_iface *hi)
+{
+ struct hsi_msg *rxmsg;
+ int ret;
+
+ spin_lock(&hi->lock);
+ if (hi->data_state &
+ (SSI_CHANNEL_STATE_READING | SSI_CHANNEL_STATE_POLL)) {
+ dev_dbg(&hi->cl->device, "Data read already pending (%u)\n",
+ hi->data_state);
+ spin_unlock(&hi->lock);
+ return;
+ }
+ hi->data_state |= SSI_CHANNEL_STATE_POLL;
+ spin_unlock(&hi->lock);
+
+ rxmsg = hi->data_rx_msg;
+ sg_init_one(rxmsg->sgt.sgl, (void *)hi->mmap_base, 0);
+ rxmsg->sgt.nents = 0;
+ rxmsg->complete = cs_hsi_peek_on_data_complete;
+
+ ret = hsi_async_read(hi->cl, rxmsg);
+ if (ret)
+ cs_hsi_data_read_error(hi, rxmsg);
+}
+
+static void cs_hsi_write_on_data_complete(struct hsi_msg *msg)
+{
+ struct cs_hsi_iface *hi = msg->context;
+
+ if (msg->status == HSI_STATUS_COMPLETED) {
+ spin_lock(&hi->lock);
+ hi->data_state &= ~SSI_CHANNEL_STATE_WRITING;
+ if (unlikely(waitqueue_active(&hi->datawait)))
+ wake_up_interruptible(&hi->datawait);
+ spin_unlock(&hi->lock);
+ } else {
+ cs_hsi_data_write_error(hi, msg);
+ }
+}
+
+static int cs_hsi_write_on_data(struct cs_hsi_iface *hi, unsigned int slot)
+{
+ u32 *address;
+ struct hsi_msg *txmsg;
+ int ret;
+
+ spin_lock(&hi->lock);
+ if (hi->iface_state != CS_STATE_CONFIGURED) {
+ dev_err(&hi->cl->device, "Not configured, aborting\n");
+ ret = -EINVAL;
+ goto error;
+ }
+ if (hi->data_state & SSI_CHANNEL_STATE_ERROR) {
+ dev_err(&hi->cl->device, "HSI error, aborting\n");
+ ret = -EIO;
+ goto error;
+ }
+ if (hi->data_state & SSI_CHANNEL_STATE_WRITING) {
+ dev_err(&hi->cl->device, "Write pending on data channel.\n");
+ ret = -EBUSY;
+ goto error;
+ }
+ hi->data_state |= SSI_CHANNEL_STATE_WRITING;
+ spin_unlock(&hi->lock);
+
+ hi->tx_slot = slot;
+ address = (u32 *)(hi->mmap_base + hi->tx_offsets[hi->tx_slot]);
+ txmsg = hi->data_tx_msg;
+ sg_init_one(txmsg->sgt.sgl, address, hi->buf_size);
+ txmsg->complete = cs_hsi_write_on_data_complete;
+ ret = hsi_async_write(hi->cl, txmsg);
+ if (ret)
+ cs_hsi_data_write_error(hi, txmsg);
+
+ return ret;
+
+error:
+ spin_unlock(&hi->lock);
+ if (ret == -EIO)
+ cs_hsi_data_write_error(hi, hi->data_tx_msg);
+
+ return ret;
+}
+
+static unsigned int cs_hsi_get_state(struct cs_hsi_iface *hi)
+{
+ return hi->iface_state;
+}
+
+static int cs_hsi_command(struct cs_hsi_iface *hi, u32 cmd)
+{
+ int ret = 0;
+
+ local_bh_disable();
+ switch (cmd & TARGET_MASK) {
+ case TARGET_REMOTE:
+ ret = cs_hsi_write_on_control(hi, cmd);
+ break;
+ case TARGET_LOCAL:
+ if ((cmd & CS_CMD_MASK) == CS_TX_DATA_READY)
+ ret = cs_hsi_write_on_data(hi, cmd & CS_PARAM_MASK);
+ else
+ ret = -EINVAL;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ local_bh_enable();
+
+ return ret;
+}
+
+static void cs_hsi_set_wakeline(struct cs_hsi_iface *hi, bool new_state)
+{
+ int change = 0;
+
+ spin_lock_bh(&hi->lock);
+ if (hi->wakeline_state != new_state) {
+ hi->wakeline_state = new_state;
+ change = 1;
+ dev_dbg(&hi->cl->device, "setting wake line to %d (%p)\n",
+ new_state, hi->cl);
+ }
+ spin_unlock_bh(&hi->lock);
+
+ if (change) {
+ if (new_state)
+ ssip_slave_start_tx(hi->master);
+ else
+ ssip_slave_stop_tx(hi->master);
+ }
+
+ dev_dbg(&hi->cl->device, "wake line set to %d (%p)\n",
+ new_state, hi->cl);
+}
+
+static void set_buffer_sizes(struct cs_hsi_iface *hi, int rx_bufs, int tx_bufs)
+{
+ hi->rx_bufs = rx_bufs;
+ hi->tx_bufs = tx_bufs;
+ hi->mmap_cfg->rx_bufs = rx_bufs;
+ hi->mmap_cfg->tx_bufs = tx_bufs;
+
+ if (hi->flags & CS_FEAT_ROLLING_RX_COUNTER) {
+ /*
+ * For more robust overrun detection, let the rx
+ * pointer run in range 0..'boundary-1'. Boundary
+ * is a multiple of rx_bufs, and limited in max size
+ * by RX_PTR_MAX_SHIFT to allow for fast ptr-diff
+ * calculation.
+ */
+ hi->rx_ptr_boundary = (rx_bufs << RX_PTR_BOUNDARY_SHIFT);
+ hi->mmap_cfg->rx_ptr_boundary = hi->rx_ptr_boundary;
+ } else {
+ hi->rx_ptr_boundary = hi->rx_bufs;
+ }
+}
+
+static int check_buf_params(struct cs_hsi_iface *hi,
+ const struct cs_buffer_config *buf_cfg)
+{
+ size_t buf_size_aligned = L1_CACHE_ALIGN(buf_cfg->buf_size) *
+ (buf_cfg->rx_bufs + buf_cfg->tx_bufs);
+ size_t ctrl_size_aligned = L1_CACHE_ALIGN(sizeof(*hi->mmap_cfg));
+ int r = 0;
+
+ if (buf_cfg->rx_bufs > CS_MAX_BUFFERS ||
+ buf_cfg->tx_bufs > CS_MAX_BUFFERS) {
+ r = -EINVAL;
+ } else if ((buf_size_aligned + ctrl_size_aligned) >= hi->mmap_size) {
+ dev_err(&hi->cl->device, "No space for the requested buffer "
+ "configuration\n");
+ r = -ENOBUFS;
+ }
+
+ return r;
+}
+
+/**
+ * Block until pending data transfers have completed.
+ */
+static int cs_hsi_data_sync(struct cs_hsi_iface *hi)
+{
+ int r = 0;
+
+ spin_lock_bh(&hi->lock);
+
+ if (!cs_state_xfer_active(hi->data_state)) {
+ dev_dbg(&hi->cl->device, "hsi_data_sync break, idle\n");
+ goto out;
+ }
+
+ for (;;) {
+ int s;
+ DEFINE_WAIT(wait);
+ if (!cs_state_xfer_active(hi->data_state))
+ goto out;
+ if (signal_pending(current)) {
+ r = -ERESTARTSYS;
+ goto out;
+ }
+ /**
+ * prepare_to_wait must be called with hi->lock held
+ * so that callbacks can check for waitqueue_active()
+ */
+ prepare_to_wait(&hi->datawait, &wait, TASK_INTERRUPTIBLE);
+ spin_unlock_bh(&hi->lock);
+ s = schedule_timeout(
+ msecs_to_jiffies(CS_HSI_TRANSFER_TIMEOUT_MS));
+ spin_lock_bh(&hi->lock);
+ finish_wait(&hi->datawait, &wait);
+ if (!s) {
+ dev_dbg(&hi->cl->device,
+ "hsi_data_sync timeout after %d ms\n",
+ CS_HSI_TRANSFER_TIMEOUT_MS);
+ r = -EIO;
+ goto out;
+ }
+ }
+
+out:
+ spin_unlock_bh(&hi->lock);
+ dev_dbg(&hi->cl->device, "hsi_data_sync done with res %d\n", r);
+
+ return r;
+}
+
+static void cs_hsi_data_enable(struct cs_hsi_iface *hi,
+ struct cs_buffer_config *buf_cfg)
+{
+ unsigned int data_start, i;
+
+ BUG_ON(hi->buf_size == 0);
+
+ set_buffer_sizes(hi, buf_cfg->rx_bufs, buf_cfg->tx_bufs);
+
+ hi->slot_size = L1_CACHE_ALIGN(hi->buf_size);
+ dev_dbg(&hi->cl->device,
+ "setting slot size to %u, buf size %u, align %u\n",
+ hi->slot_size, hi->buf_size, L1_CACHE_BYTES);
+
+ data_start = L1_CACHE_ALIGN(sizeof(*hi->mmap_cfg));
+ dev_dbg(&hi->cl->device,
+ "setting data start at %u, cfg block %u, align %u\n",
+ data_start, sizeof(*hi->mmap_cfg), L1_CACHE_BYTES);
+
+ for (i = 0; i < hi->mmap_cfg->rx_bufs; i++) {
+ hi->rx_offsets[i] = data_start + i * hi->slot_size;
+ hi->mmap_cfg->rx_offsets[i] = hi->rx_offsets[i];
+ dev_dbg(&hi->cl->device, "DL buf #%u at %u\n",
+ i, hi->rx_offsets[i]);
+ }
+ for (i = 0; i < hi->mmap_cfg->tx_bufs; i++) {
+ hi->tx_offsets[i] = data_start +
+ (i + hi->mmap_cfg->rx_bufs) * hi->slot_size;
+ hi->mmap_cfg->tx_offsets[i] = hi->tx_offsets[i];
+ dev_dbg(&hi->cl->device, "UL buf #%u at %u\n",
+ i, hi->rx_offsets[i]);
+ }
+
+ hi->iface_state = CS_STATE_CONFIGURED;
+}
+
+static void cs_hsi_data_disable(struct cs_hsi_iface *hi, int old_state)
+{
+ if (old_state == CS_STATE_CONFIGURED) {
+ dev_dbg(&hi->cl->device,
+ "closing data channel with slot size 0\n");
+ hi->iface_state = CS_STATE_OPENED;
+ }
+}
+
+static int cs_hsi_buf_config(struct cs_hsi_iface *hi,
+ struct cs_buffer_config *buf_cfg)
+{
+ int r = 0;
+ unsigned int old_state = hi->iface_state;
+
+ spin_lock_bh(&hi->lock);
+ /* Prevent new transactions during buffer reconfig */
+ if (old_state == CS_STATE_CONFIGURED)
+ hi->iface_state = CS_STATE_OPENED;
+ spin_unlock_bh(&hi->lock);
+
+ /*
+ * make sure that no non-zero data reads are ongoing before
+ * proceeding to change the buffer layout
+ */
+ r = cs_hsi_data_sync(hi);
+ if (r < 0)
+ return r;
+
+ WARN_ON(cs_state_xfer_active(hi->data_state));
+
+ spin_lock_bh(&hi->lock);
+ r = check_buf_params(hi, buf_cfg);
+ if (r < 0)
+ goto error;
+
+ hi->buf_size = buf_cfg->buf_size;
+ hi->mmap_cfg->buf_size = hi->buf_size;
+ hi->flags = buf_cfg->flags;
+
+ hi->rx_slot = 0;
+ hi->tx_slot = 0;
+ hi->slot_size = 0;
+
+ if (hi->buf_size)
+ cs_hsi_data_enable(hi, buf_cfg);
+ else
+ cs_hsi_data_disable(hi, old_state);
+
+ spin_unlock_bh(&hi->lock);
+
+ if (old_state != hi->iface_state) {
+ if (hi->iface_state == CS_STATE_CONFIGURED) {
+ pm_qos_add_request(&hi->pm_qos_req,
+ PM_QOS_CPU_DMA_LATENCY,
+ CS_QOS_LATENCY_FOR_DATA_USEC);
+ local_bh_disable();
+ cs_hsi_read_on_data(hi);
+ local_bh_enable();
+ } else if (old_state == CS_STATE_CONFIGURED) {
+ pm_qos_remove_request(&hi->pm_qos_req);
+ }
+ }
+ return r;
+
+error:
+ spin_unlock_bh(&hi->lock);
+ return r;
+}
+
+static int cs_hsi_start(struct cs_hsi_iface **hi, struct hsi_client *cl,
+ unsigned long mmap_base, unsigned long mmap_size)
+{
+ int err = 0;
+ struct cs_hsi_iface *hsi_if = kzalloc(sizeof(*hsi_if), GFP_KERNEL);
+
+ dev_dbg(&cl->device, "cs_hsi_start\n");
+
+ if (!hsi_if) {
+ err = -ENOMEM;
+ goto leave0;
+ }
+ spin_lock_init(&hsi_if->lock);
+ hsi_if->cl = cl;
+ hsi_if->iface_state = CS_STATE_CLOSED;
+ hsi_if->mmap_cfg = (struct cs_mmap_config_block *)mmap_base;
+ hsi_if->mmap_base = mmap_base;
+ hsi_if->mmap_size = mmap_size;
+ memset(hsi_if->mmap_cfg, 0, sizeof(*hsi_if->mmap_cfg));
+ init_waitqueue_head(&hsi_if->datawait);
+ err = cs_alloc_cmds(hsi_if);
+ if (err < 0) {
+ dev_err(&cl->device, "Unable to alloc HSI messages\n");
+ goto leave1;
+ }
+ err = cs_hsi_alloc_data(hsi_if);
+ if (err < 0) {
+ dev_err(&cl->device, "Unable to alloc HSI messages for data\n");
+ goto leave2;
+ }
+ err = hsi_claim_port(cl, 1);
+ if (err < 0) {
+ dev_err(&cl->device,
+ "Could not open, HSI port already claimed\n");
+ goto leave3;
+ }
+ hsi_if->master = ssip_slave_get_master(cl);
+ if (IS_ERR(hsi_if->master)) {
+ err = PTR_ERR(hsi_if->master);
+ dev_err(&cl->device, "Could not get HSI master client\n");
+ goto leave4;
+ }
+ if (!ssip_slave_running(hsi_if->master)) {
+ err = -ENODEV;
+ dev_err(&cl->device,
+ "HSI port not initialized\n");
+ goto leave4;
+ }
+
+ hsi_if->iface_state = CS_STATE_OPENED;
+ local_bh_disable();
+ cs_hsi_read_on_control(hsi_if);
+ local_bh_enable();
+
+ dev_dbg(&cl->device, "cs_hsi_start...done\n");
+
+ BUG_ON(!hi);
+ *hi = hsi_if;
+
+ return 0;
+
+leave4:
+ hsi_release_port(cl);
+leave3:
+ cs_hsi_free_data(hsi_if);
+leave2:
+ cs_free_cmds(hsi_if);
+leave1:
+ kfree(hsi_if);
+leave0:
+ dev_dbg(&cl->device, "cs_hsi_start...done/error\n\n");
+
+ return err;
+}
+
+static void cs_hsi_stop(struct cs_hsi_iface *hi)
+{
+ dev_dbg(&hi->cl->device, "cs_hsi_stop\n");
+ cs_hsi_set_wakeline(hi, 0);
+ ssip_slave_put_master(hi->master);
+
+ /* hsi_release_port() needs to be called with CS_STATE_CLOSED */
+ hi->iface_state = CS_STATE_CLOSED;
+ hsi_release_port(hi->cl);
+
+ /*
+ * hsi_release_port() should flush out all the pending
+ * messages, so cs_state_idle() should be true for both
+ * control and data channels.
+ */
+ WARN_ON(!cs_state_idle(hi->control_state));
+ WARN_ON(!cs_state_idle(hi->data_state));
+
+ if (pm_qos_request_active(&hi->pm_qos_req))
+ pm_qos_remove_request(&hi->pm_qos_req);
+
+ spin_lock_bh(&hi->lock);
+ cs_hsi_free_data(hi);
+ cs_free_cmds(hi);
+ spin_unlock_bh(&hi->lock);
+ kfree(hi);
+}
+
+static vm_fault_t cs_char_vma_fault(struct vm_fault *vmf)
+{
+ struct cs_char *csdata = vmf->vma->vm_private_data;
+ struct page *page;
+
+ page = virt_to_page(csdata->mmap_base);
+ get_page(page);
+ vmf->page = page;
+
+ return 0;
+}
+
+static const struct vm_operations_struct cs_char_vm_ops = {
+ .fault = cs_char_vma_fault,
+};
+
+static int cs_char_fasync(int fd, struct file *file, int on)
+{
+ struct cs_char *csdata = file->private_data;
+
+ if (fasync_helper(fd, file, on, &csdata->async_queue) < 0)
+ return -EIO;
+
+ return 0;
+}
+
+static __poll_t cs_char_poll(struct file *file, poll_table *wait)
+{
+ struct cs_char *csdata = file->private_data;
+ __poll_t ret = 0;
+
+ poll_wait(file, &cs_char_data.wait, wait);
+ spin_lock_bh(&csdata->lock);
+ if (!list_empty(&csdata->chardev_queue))
+ ret = EPOLLIN | EPOLLRDNORM;
+ else if (!list_empty(&csdata->dataind_queue))
+ ret = EPOLLIN | EPOLLRDNORM;
+ spin_unlock_bh(&csdata->lock);
+
+ return ret;
+}
+
+static ssize_t cs_char_read(struct file *file, char __user *buf, size_t count,
+ loff_t *unused)
+{
+ struct cs_char *csdata = file->private_data;
+ u32 data;
+ ssize_t retval;
+
+ if (count < sizeof(data))
+ return -EINVAL;
+
+ for (;;) {
+ DEFINE_WAIT(wait);
+
+ spin_lock_bh(&csdata->lock);
+ if (!list_empty(&csdata->chardev_queue)) {
+ data = cs_pop_entry(&csdata->chardev_queue);
+ } else if (!list_empty(&csdata->dataind_queue)) {
+ data = cs_pop_entry(&csdata->dataind_queue);
+ csdata->dataind_pending--;
+ } else {
+ data = 0;
+ }
+ spin_unlock_bh(&csdata->lock);
+
+ if (data)
+ break;
+ if (file->f_flags & O_NONBLOCK) {
+ retval = -EAGAIN;
+ goto out;
+ } else if (signal_pending(current)) {
+ retval = -ERESTARTSYS;
+ goto out;
+ }
+ prepare_to_wait_exclusive(&csdata->wait, &wait,
+ TASK_INTERRUPTIBLE);
+ schedule();
+ finish_wait(&csdata->wait, &wait);
+ }
+
+ retval = put_user(data, (u32 __user *)buf);
+ if (!retval)
+ retval = sizeof(data);
+
+out:
+ return retval;
+}
+
+static ssize_t cs_char_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *unused)
+{
+ struct cs_char *csdata = file->private_data;
+ u32 data;
+ int err;
+ ssize_t retval;
+
+ if (count < sizeof(data))
+ return -EINVAL;
+
+ if (get_user(data, (u32 __user *)buf))
+ retval = -EFAULT;
+ else
+ retval = count;
+
+ err = cs_hsi_command(csdata->hi, data);
+ if (err < 0)
+ retval = err;
+
+ return retval;
+}
+
+static long cs_char_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ struct cs_char *csdata = file->private_data;
+ int r = 0;
+
+ switch (cmd) {
+ case CS_GET_STATE: {
+ unsigned int state;
+
+ state = cs_hsi_get_state(csdata->hi);
+ if (copy_to_user((void __user *)arg, &state, sizeof(state)))
+ r = -EFAULT;
+
+ break;
+ }
+ case CS_SET_WAKELINE: {
+ unsigned int state;
+
+ if (copy_from_user(&state, (void __user *)arg, sizeof(state))) {
+ r = -EFAULT;
+ break;
+ }
+
+ if (state > 1) {
+ r = -EINVAL;
+ break;
+ }
+
+ cs_hsi_set_wakeline(csdata->hi, !!state);
+
+ break;
+ }
+ case CS_GET_IF_VERSION: {
+ unsigned int ifver = CS_IF_VERSION;
+
+ if (copy_to_user((void __user *)arg, &ifver, sizeof(ifver)))
+ r = -EFAULT;
+
+ break;
+ }
+ case CS_CONFIG_BUFS: {
+ struct cs_buffer_config buf_cfg;
+
+ if (copy_from_user(&buf_cfg, (void __user *)arg,
+ sizeof(buf_cfg)))
+ r = -EFAULT;
+ else
+ r = cs_hsi_buf_config(csdata->hi, &buf_cfg);
+
+ break;
+ }
+ default:
+ r = -ENOTTY;
+ break;
+ }
+
+ return r;
+}
+
+static int cs_char_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ if (vma->vm_end < vma->vm_start)
+ return -EINVAL;
+
+ if (vma_pages(vma) != 1)
+ return -EINVAL;
+
+ vma->vm_flags |= VM_IO | VM_DONTDUMP | VM_DONTEXPAND;
+ vma->vm_ops = &cs_char_vm_ops;
+ vma->vm_private_data = file->private_data;
+
+ return 0;
+}
+
+static int cs_char_open(struct inode *unused, struct file *file)
+{
+ int ret = 0;
+ unsigned long p;
+
+ spin_lock_bh(&cs_char_data.lock);
+ if (cs_char_data.opened) {
+ ret = -EBUSY;
+ spin_unlock_bh(&cs_char_data.lock);
+ goto out1;
+ }
+ cs_char_data.opened = 1;
+ cs_char_data.dataind_pending = 0;
+ spin_unlock_bh(&cs_char_data.lock);
+
+ p = get_zeroed_page(GFP_KERNEL);
+ if (!p) {
+ ret = -ENOMEM;
+ goto out2;
+ }
+
+ ret = cs_hsi_start(&cs_char_data.hi, cs_char_data.cl, p, CS_MMAP_SIZE);
+ if (ret) {
+ dev_err(&cs_char_data.cl->device, "Unable to initialize HSI\n");
+ goto out3;
+ }
+
+ /* these are only used in release so lock not needed */
+ cs_char_data.mmap_base = p;
+ cs_char_data.mmap_size = CS_MMAP_SIZE;
+
+ file->private_data = &cs_char_data;
+
+ return 0;
+
+out3:
+ free_page(p);
+out2:
+ spin_lock_bh(&cs_char_data.lock);
+ cs_char_data.opened = 0;
+ spin_unlock_bh(&cs_char_data.lock);
+out1:
+ return ret;
+}
+
+static void cs_free_char_queue(struct list_head *head)
+{
+ struct char_queue *entry;
+ struct list_head *cursor, *next;
+
+ if (!list_empty(head)) {
+ list_for_each_safe(cursor, next, head) {
+ entry = list_entry(cursor, struct char_queue, list);
+ list_del(&entry->list);
+ kfree(entry);
+ }
+ }
+
+}
+
+static int cs_char_release(struct inode *unused, struct file *file)
+{
+ struct cs_char *csdata = file->private_data;
+
+ cs_hsi_stop(csdata->hi);
+ spin_lock_bh(&csdata->lock);
+ csdata->hi = NULL;
+ free_page(csdata->mmap_base);
+ cs_free_char_queue(&csdata->chardev_queue);
+ cs_free_char_queue(&csdata->dataind_queue);
+ csdata->opened = 0;
+ spin_unlock_bh(&csdata->lock);
+
+ return 0;
+}
+
+static const struct file_operations cs_char_fops = {
+ .owner = THIS_MODULE,
+ .read = cs_char_read,
+ .write = cs_char_write,
+ .poll = cs_char_poll,
+ .unlocked_ioctl = cs_char_ioctl,
+ .mmap = cs_char_mmap,
+ .open = cs_char_open,
+ .release = cs_char_release,
+ .fasync = cs_char_fasync,
+};
+
+static struct miscdevice cs_char_miscdev = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "cmt_speech",
+ .fops = &cs_char_fops
+};
+
+static int cs_hsi_client_probe(struct device *dev)
+{
+ int err = 0;
+ struct hsi_client *cl = to_hsi_client(dev);
+
+ dev_dbg(dev, "hsi_client_probe\n");
+ init_waitqueue_head(&cs_char_data.wait);
+ spin_lock_init(&cs_char_data.lock);
+ cs_char_data.opened = 0;
+ cs_char_data.cl = cl;
+ cs_char_data.hi = NULL;
+ INIT_LIST_HEAD(&cs_char_data.chardev_queue);
+ INIT_LIST_HEAD(&cs_char_data.dataind_queue);
+
+ cs_char_data.channel_id_cmd = hsi_get_channel_id_by_name(cl,
+ "speech-control");
+ if (cs_char_data.channel_id_cmd < 0) {
+ err = cs_char_data.channel_id_cmd;
+ dev_err(dev, "Could not get cmd channel (%d)\n", err);
+ return err;
+ }
+
+ cs_char_data.channel_id_data = hsi_get_channel_id_by_name(cl,
+ "speech-data");
+ if (cs_char_data.channel_id_data < 0) {
+ err = cs_char_data.channel_id_data;
+ dev_err(dev, "Could not get data channel (%d)\n", err);
+ return err;
+ }
+
+ err = misc_register(&cs_char_miscdev);
+ if (err)
+ dev_err(dev, "Failed to register: %d\n", err);
+
+ return err;
+}
+
+static int cs_hsi_client_remove(struct device *dev)
+{
+ struct cs_hsi_iface *hi;
+
+ dev_dbg(dev, "hsi_client_remove\n");
+ misc_deregister(&cs_char_miscdev);
+ spin_lock_bh(&cs_char_data.lock);
+ hi = cs_char_data.hi;
+ cs_char_data.hi = NULL;
+ spin_unlock_bh(&cs_char_data.lock);
+ if (hi)
+ cs_hsi_stop(hi);
+
+ return 0;
+}
+
+static struct hsi_client_driver cs_hsi_driver = {
+ .driver = {
+ .name = "cmt-speech",
+ .owner = THIS_MODULE,
+ .probe = cs_hsi_client_probe,
+ .remove = cs_hsi_client_remove,
+ },
+};
+
+static int __init cs_char_init(void)
+{
+ pr_info("CMT speech driver added\n");
+ return hsi_register_client_driver(&cs_hsi_driver);
+}
+module_init(cs_char_init);
+
+static void __exit cs_char_exit(void)
+{
+ hsi_unregister_client_driver(&cs_hsi_driver);
+ pr_info("CMT speech driver removed\n");
+}
+module_exit(cs_char_exit);
+
+MODULE_ALIAS("hsi:cmt-speech");
+MODULE_AUTHOR("Kai Vehmanen <kai.vehmanen@nokia.com>");
+MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@nokia.com>");
+MODULE_DESCRIPTION("CMT speech driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/hsi/clients/hsi_char.c b/drivers/hsi/clients/hsi_char.c
new file mode 100644
index 0000000..9d2a6d6
--- /dev/null
+++ b/drivers/hsi/clients/hsi_char.c
@@ -0,0 +1,801 @@
+/*
+ * HSI character device driver, implements the character device
+ * interface.
+ *
+ * Copyright (C) 2010 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Andras Domokos <andras.domokos@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/atomic.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/kmemleak.h>
+#include <linux/ioctl.h>
+#include <linux/wait.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/device.h>
+#include <linux/cdev.h>
+#include <linux/uaccess.h>
+#include <linux/scatterlist.h>
+#include <linux/stat.h>
+#include <linux/hsi/hsi.h>
+#include <linux/hsi/hsi_char.h>
+
+#define HSC_DEVS 16 /* Num of channels */
+#define HSC_MSGS 4
+
+#define HSC_RXBREAK 0
+
+#define HSC_ID_BITS 6
+#define HSC_PORT_ID_BITS 4
+#define HSC_ID_MASK 3
+#define HSC_PORT_ID_MASK 3
+#define HSC_CH_MASK 0xf
+
+/*
+ * We support up to 4 controllers that can have up to 4
+ * ports, which should currently be more than enough.
+ */
+#define HSC_BASEMINOR(id, port_id) \
+ ((((id) & HSC_ID_MASK) << HSC_ID_BITS) | \
+ (((port_id) & HSC_PORT_ID_MASK) << HSC_PORT_ID_BITS))
+
+enum {
+ HSC_CH_OPEN,
+ HSC_CH_READ,
+ HSC_CH_WRITE,
+ HSC_CH_WLINE,
+};
+
+enum {
+ HSC_RX,
+ HSC_TX,
+};
+
+struct hsc_client_data;
+/**
+ * struct hsc_channel - hsi_char internal channel data
+ * @ch: channel number
+ * @flags: Keeps state of the channel (open/close, reading, writing)
+ * @free_msgs_list: List of free HSI messages/requests
+ * @rx_msgs_queue: List of pending RX requests
+ * @tx_msgs_queue: List of pending TX requests
+ * @lock: Serialize access to the lists
+ * @cl: reference to the associated hsi_client
+ * @cl_data: reference to the client data that this channels belongs to
+ * @rx_wait: RX requests wait queue
+ * @tx_wait: TX requests wait queue
+ */
+struct hsc_channel {
+ unsigned int ch;
+ unsigned long flags;
+ struct list_head free_msgs_list;
+ struct list_head rx_msgs_queue;
+ struct list_head tx_msgs_queue;
+ spinlock_t lock;
+ struct hsi_client *cl;
+ struct hsc_client_data *cl_data;
+ wait_queue_head_t rx_wait;
+ wait_queue_head_t tx_wait;
+};
+
+/**
+ * struct hsc_client_data - hsi_char internal client data
+ * @cdev: Characther device associated to the hsi_client
+ * @lock: Lock to serialize open/close access
+ * @flags: Keeps track of port state (rx hwbreak armed)
+ * @usecnt: Use count for claiming the HSI port (mutex protected)
+ * @cl: Referece to the HSI client
+ * @channels: Array of channels accessible by the client
+ */
+struct hsc_client_data {
+ struct cdev cdev;
+ struct mutex lock;
+ unsigned long flags;
+ unsigned int usecnt;
+ struct hsi_client *cl;
+ struct hsc_channel channels[HSC_DEVS];
+};
+
+/* Stores the major number dynamically allocated for hsi_char */
+static unsigned int hsc_major;
+/* Maximum buffer size that hsi_char will accept from userspace */
+static unsigned int max_data_size = 0x1000;
+module_param(max_data_size, uint, 0);
+MODULE_PARM_DESC(max_data_size, "max read/write data size [4,8..65536] (^2)");
+
+static void hsc_add_tail(struct hsc_channel *channel, struct hsi_msg *msg,
+ struct list_head *queue)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&channel->lock, flags);
+ list_add_tail(&msg->link, queue);
+ spin_unlock_irqrestore(&channel->lock, flags);
+}
+
+static struct hsi_msg *hsc_get_first_msg(struct hsc_channel *channel,
+ struct list_head *queue)
+{
+ struct hsi_msg *msg = NULL;
+ unsigned long flags;
+
+ spin_lock_irqsave(&channel->lock, flags);
+
+ if (list_empty(queue))
+ goto out;
+
+ msg = list_first_entry(queue, struct hsi_msg, link);
+ list_del(&msg->link);
+out:
+ spin_unlock_irqrestore(&channel->lock, flags);
+
+ return msg;
+}
+
+static inline void hsc_msg_free(struct hsi_msg *msg)
+{
+ kfree(sg_virt(msg->sgt.sgl));
+ hsi_free_msg(msg);
+}
+
+static void hsc_free_list(struct list_head *list)
+{
+ struct hsi_msg *msg, *tmp;
+
+ list_for_each_entry_safe(msg, tmp, list, link) {
+ list_del(&msg->link);
+ hsc_msg_free(msg);
+ }
+}
+
+static void hsc_reset_list(struct hsc_channel *channel, struct list_head *l)
+{
+ unsigned long flags;
+ LIST_HEAD(list);
+
+ spin_lock_irqsave(&channel->lock, flags);
+ list_splice_init(l, &list);
+ spin_unlock_irqrestore(&channel->lock, flags);
+
+ hsc_free_list(&list);
+}
+
+static inline struct hsi_msg *hsc_msg_alloc(unsigned int alloc_size)
+{
+ struct hsi_msg *msg;
+ void *buf;
+
+ msg = hsi_alloc_msg(1, GFP_KERNEL);
+ if (!msg)
+ goto out;
+ buf = kmalloc(alloc_size, GFP_KERNEL);
+ if (!buf) {
+ hsi_free_msg(msg);
+ goto out;
+ }
+ sg_init_one(msg->sgt.sgl, buf, alloc_size);
+ /* Ignore false positive, due to sg pointer handling */
+ kmemleak_ignore(buf);
+
+ return msg;
+out:
+ return NULL;
+}
+
+static inline int hsc_msgs_alloc(struct hsc_channel *channel)
+{
+ struct hsi_msg *msg;
+ int i;
+
+ for (i = 0; i < HSC_MSGS; i++) {
+ msg = hsc_msg_alloc(max_data_size);
+ if (!msg)
+ goto out;
+ msg->channel = channel->ch;
+ list_add_tail(&msg->link, &channel->free_msgs_list);
+ }
+
+ return 0;
+out:
+ hsc_free_list(&channel->free_msgs_list);
+
+ return -ENOMEM;
+}
+
+static inline unsigned int hsc_msg_len_get(struct hsi_msg *msg)
+{
+ return msg->sgt.sgl->length;
+}
+
+static inline void hsc_msg_len_set(struct hsi_msg *msg, unsigned int len)
+{
+ msg->sgt.sgl->length = len;
+}
+
+static void hsc_rx_completed(struct hsi_msg *msg)
+{
+ struct hsc_client_data *cl_data = hsi_client_drvdata(msg->cl);
+ struct hsc_channel *channel = cl_data->channels + msg->channel;
+
+ if (test_bit(HSC_CH_READ, &channel->flags)) {
+ hsc_add_tail(channel, msg, &channel->rx_msgs_queue);
+ wake_up(&channel->rx_wait);
+ } else {
+ hsc_add_tail(channel, msg, &channel->free_msgs_list);
+ }
+}
+
+static void hsc_rx_msg_destructor(struct hsi_msg *msg)
+{
+ msg->status = HSI_STATUS_ERROR;
+ hsc_msg_len_set(msg, 0);
+ hsc_rx_completed(msg);
+}
+
+static void hsc_tx_completed(struct hsi_msg *msg)
+{
+ struct hsc_client_data *cl_data = hsi_client_drvdata(msg->cl);
+ struct hsc_channel *channel = cl_data->channels + msg->channel;
+
+ if (test_bit(HSC_CH_WRITE, &channel->flags)) {
+ hsc_add_tail(channel, msg, &channel->tx_msgs_queue);
+ wake_up(&channel->tx_wait);
+ } else {
+ hsc_add_tail(channel, msg, &channel->free_msgs_list);
+ }
+}
+
+static void hsc_tx_msg_destructor(struct hsi_msg *msg)
+{
+ msg->status = HSI_STATUS_ERROR;
+ hsc_msg_len_set(msg, 0);
+ hsc_tx_completed(msg);
+}
+
+static void hsc_break_req_destructor(struct hsi_msg *msg)
+{
+ struct hsc_client_data *cl_data = hsi_client_drvdata(msg->cl);
+
+ hsi_free_msg(msg);
+ clear_bit(HSC_RXBREAK, &cl_data->flags);
+}
+
+static void hsc_break_received(struct hsi_msg *msg)
+{
+ struct hsc_client_data *cl_data = hsi_client_drvdata(msg->cl);
+ struct hsc_channel *channel = cl_data->channels;
+ int i, ret;
+
+ /* Broadcast HWBREAK on all channels */
+ for (i = 0; i < HSC_DEVS; i++, channel++) {
+ struct hsi_msg *msg2;
+
+ if (!test_bit(HSC_CH_READ, &channel->flags))
+ continue;
+ msg2 = hsc_get_first_msg(channel, &channel->free_msgs_list);
+ if (!msg2)
+ continue;
+ clear_bit(HSC_CH_READ, &channel->flags);
+ hsc_msg_len_set(msg2, 0);
+ msg2->status = HSI_STATUS_COMPLETED;
+ hsc_add_tail(channel, msg2, &channel->rx_msgs_queue);
+ wake_up(&channel->rx_wait);
+ }
+ hsi_flush(msg->cl);
+ ret = hsi_async_read(msg->cl, msg);
+ if (ret < 0)
+ hsc_break_req_destructor(msg);
+}
+
+static int hsc_break_request(struct hsi_client *cl)
+{
+ struct hsc_client_data *cl_data = hsi_client_drvdata(cl);
+ struct hsi_msg *msg;
+ int ret;
+
+ if (test_and_set_bit(HSC_RXBREAK, &cl_data->flags))
+ return -EBUSY;
+
+ msg = hsi_alloc_msg(0, GFP_KERNEL);
+ if (!msg) {
+ clear_bit(HSC_RXBREAK, &cl_data->flags);
+ return -ENOMEM;
+ }
+ msg->break_frame = 1;
+ msg->complete = hsc_break_received;
+ msg->destructor = hsc_break_req_destructor;
+ ret = hsi_async_read(cl, msg);
+ if (ret < 0)
+ hsc_break_req_destructor(msg);
+
+ return ret;
+}
+
+static int hsc_break_send(struct hsi_client *cl)
+{
+ struct hsi_msg *msg;
+ int ret;
+
+ msg = hsi_alloc_msg(0, GFP_ATOMIC);
+ if (!msg)
+ return -ENOMEM;
+ msg->break_frame = 1;
+ msg->complete = hsi_free_msg;
+ msg->destructor = hsi_free_msg;
+ ret = hsi_async_write(cl, msg);
+ if (ret < 0)
+ hsi_free_msg(msg);
+
+ return ret;
+}
+
+static int hsc_rx_set(struct hsi_client *cl, struct hsc_rx_config *rxc)
+{
+ struct hsi_config tmp;
+ int ret;
+
+ if ((rxc->mode != HSI_MODE_STREAM) && (rxc->mode != HSI_MODE_FRAME))
+ return -EINVAL;
+ if ((rxc->channels == 0) || (rxc->channels > HSC_DEVS))
+ return -EINVAL;
+ if (rxc->channels & (rxc->channels - 1))
+ return -EINVAL;
+ if ((rxc->flow != HSI_FLOW_SYNC) && (rxc->flow != HSI_FLOW_PIPE))
+ return -EINVAL;
+ tmp = cl->rx_cfg;
+ cl->rx_cfg.mode = rxc->mode;
+ cl->rx_cfg.num_hw_channels = rxc->channels;
+ cl->rx_cfg.flow = rxc->flow;
+ ret = hsi_setup(cl);
+ if (ret < 0) {
+ cl->rx_cfg = tmp;
+ return ret;
+ }
+ if (rxc->mode == HSI_MODE_FRAME)
+ hsc_break_request(cl);
+
+ return ret;
+}
+
+static inline void hsc_rx_get(struct hsi_client *cl, struct hsc_rx_config *rxc)
+{
+ rxc->mode = cl->rx_cfg.mode;
+ rxc->channels = cl->rx_cfg.num_hw_channels;
+ rxc->flow = cl->rx_cfg.flow;
+}
+
+static int hsc_tx_set(struct hsi_client *cl, struct hsc_tx_config *txc)
+{
+ struct hsi_config tmp;
+ int ret;
+
+ if ((txc->mode != HSI_MODE_STREAM) && (txc->mode != HSI_MODE_FRAME))
+ return -EINVAL;
+ if ((txc->channels == 0) || (txc->channels > HSC_DEVS))
+ return -EINVAL;
+ if (txc->channels & (txc->channels - 1))
+ return -EINVAL;
+ if ((txc->arb_mode != HSI_ARB_RR) && (txc->arb_mode != HSI_ARB_PRIO))
+ return -EINVAL;
+ tmp = cl->tx_cfg;
+ cl->tx_cfg.mode = txc->mode;
+ cl->tx_cfg.num_hw_channels = txc->channels;
+ cl->tx_cfg.speed = txc->speed;
+ cl->tx_cfg.arb_mode = txc->arb_mode;
+ ret = hsi_setup(cl);
+ if (ret < 0) {
+ cl->tx_cfg = tmp;
+ return ret;
+ }
+
+ return ret;
+}
+
+static inline void hsc_tx_get(struct hsi_client *cl, struct hsc_tx_config *txc)
+{
+ txc->mode = cl->tx_cfg.mode;
+ txc->channels = cl->tx_cfg.num_hw_channels;
+ txc->speed = cl->tx_cfg.speed;
+ txc->arb_mode = cl->tx_cfg.arb_mode;
+}
+
+static ssize_t hsc_read(struct file *file, char __user *buf, size_t len,
+ loff_t *ppos __maybe_unused)
+{
+ struct hsc_channel *channel = file->private_data;
+ struct hsi_msg *msg;
+ ssize_t ret;
+
+ if (len == 0)
+ return 0;
+ if (!IS_ALIGNED(len, sizeof(u32)))
+ return -EINVAL;
+ if (len > max_data_size)
+ len = max_data_size;
+ if (channel->ch >= channel->cl->rx_cfg.num_hw_channels)
+ return -ECHRNG;
+ if (test_and_set_bit(HSC_CH_READ, &channel->flags))
+ return -EBUSY;
+ msg = hsc_get_first_msg(channel, &channel->free_msgs_list);
+ if (!msg) {
+ ret = -ENOSPC;
+ goto out;
+ }
+ hsc_msg_len_set(msg, len);
+ msg->complete = hsc_rx_completed;
+ msg->destructor = hsc_rx_msg_destructor;
+ ret = hsi_async_read(channel->cl, msg);
+ if (ret < 0) {
+ hsc_add_tail(channel, msg, &channel->free_msgs_list);
+ goto out;
+ }
+
+ ret = wait_event_interruptible(channel->rx_wait,
+ !list_empty(&channel->rx_msgs_queue));
+ if (ret < 0) {
+ clear_bit(HSC_CH_READ, &channel->flags);
+ hsi_flush(channel->cl);
+ return -EINTR;
+ }
+
+ msg = hsc_get_first_msg(channel, &channel->rx_msgs_queue);
+ if (msg) {
+ if (msg->status != HSI_STATUS_ERROR) {
+ ret = copy_to_user((void __user *)buf,
+ sg_virt(msg->sgt.sgl), hsc_msg_len_get(msg));
+ if (ret)
+ ret = -EFAULT;
+ else
+ ret = hsc_msg_len_get(msg);
+ } else {
+ ret = -EIO;
+ }
+ hsc_add_tail(channel, msg, &channel->free_msgs_list);
+ }
+out:
+ clear_bit(HSC_CH_READ, &channel->flags);
+
+ return ret;
+}
+
+static ssize_t hsc_write(struct file *file, const char __user *buf, size_t len,
+ loff_t *ppos __maybe_unused)
+{
+ struct hsc_channel *channel = file->private_data;
+ struct hsi_msg *msg;
+ ssize_t ret;
+
+ if ((len == 0) || !IS_ALIGNED(len, sizeof(u32)))
+ return -EINVAL;
+ if (len > max_data_size)
+ len = max_data_size;
+ if (channel->ch >= channel->cl->tx_cfg.num_hw_channels)
+ return -ECHRNG;
+ if (test_and_set_bit(HSC_CH_WRITE, &channel->flags))
+ return -EBUSY;
+ msg = hsc_get_first_msg(channel, &channel->free_msgs_list);
+ if (!msg) {
+ clear_bit(HSC_CH_WRITE, &channel->flags);
+ return -ENOSPC;
+ }
+ if (copy_from_user(sg_virt(msg->sgt.sgl), (void __user *)buf, len)) {
+ ret = -EFAULT;
+ goto out;
+ }
+ hsc_msg_len_set(msg, len);
+ msg->complete = hsc_tx_completed;
+ msg->destructor = hsc_tx_msg_destructor;
+ ret = hsi_async_write(channel->cl, msg);
+ if (ret < 0)
+ goto out;
+
+ ret = wait_event_interruptible(channel->tx_wait,
+ !list_empty(&channel->tx_msgs_queue));
+ if (ret < 0) {
+ clear_bit(HSC_CH_WRITE, &channel->flags);
+ hsi_flush(channel->cl);
+ return -EINTR;
+ }
+
+ msg = hsc_get_first_msg(channel, &channel->tx_msgs_queue);
+ if (msg) {
+ if (msg->status == HSI_STATUS_ERROR)
+ ret = -EIO;
+ else
+ ret = hsc_msg_len_get(msg);
+
+ hsc_add_tail(channel, msg, &channel->free_msgs_list);
+ }
+out:
+ clear_bit(HSC_CH_WRITE, &channel->flags);
+
+ return ret;
+}
+
+static long hsc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ struct hsc_channel *channel = file->private_data;
+ unsigned int state;
+ struct hsc_rx_config rxc;
+ struct hsc_tx_config txc;
+ long ret = 0;
+
+ switch (cmd) {
+ case HSC_RESET:
+ hsi_flush(channel->cl);
+ break;
+ case HSC_SET_PM:
+ if (copy_from_user(&state, (void __user *)arg, sizeof(state)))
+ return -EFAULT;
+ if (state == HSC_PM_DISABLE) {
+ if (test_and_set_bit(HSC_CH_WLINE, &channel->flags))
+ return -EINVAL;
+ ret = hsi_start_tx(channel->cl);
+ } else if (state == HSC_PM_ENABLE) {
+ if (!test_and_clear_bit(HSC_CH_WLINE, &channel->flags))
+ return -EINVAL;
+ ret = hsi_stop_tx(channel->cl);
+ } else {
+ ret = -EINVAL;
+ }
+ break;
+ case HSC_SEND_BREAK:
+ return hsc_break_send(channel->cl);
+ case HSC_SET_RX:
+ if (copy_from_user(&rxc, (void __user *)arg, sizeof(rxc)))
+ return -EFAULT;
+ return hsc_rx_set(channel->cl, &rxc);
+ case HSC_GET_RX:
+ hsc_rx_get(channel->cl, &rxc);
+ if (copy_to_user((void __user *)arg, &rxc, sizeof(rxc)))
+ return -EFAULT;
+ break;
+ case HSC_SET_TX:
+ if (copy_from_user(&txc, (void __user *)arg, sizeof(txc)))
+ return -EFAULT;
+ return hsc_tx_set(channel->cl, &txc);
+ case HSC_GET_TX:
+ hsc_tx_get(channel->cl, &txc);
+ if (copy_to_user((void __user *)arg, &txc, sizeof(txc)))
+ return -EFAULT;
+ break;
+ default:
+ return -ENOIOCTLCMD;
+ }
+
+ return ret;
+}
+
+static inline void __hsc_port_release(struct hsc_client_data *cl_data)
+{
+ BUG_ON(cl_data->usecnt == 0);
+
+ if (--cl_data->usecnt == 0) {
+ hsi_flush(cl_data->cl);
+ hsi_release_port(cl_data->cl);
+ }
+}
+
+static int hsc_open(struct inode *inode, struct file *file)
+{
+ struct hsc_client_data *cl_data;
+ struct hsc_channel *channel;
+ int ret = 0;
+
+ pr_debug("open, minor = %d\n", iminor(inode));
+
+ cl_data = container_of(inode->i_cdev, struct hsc_client_data, cdev);
+ mutex_lock(&cl_data->lock);
+ channel = cl_data->channels + (iminor(inode) & HSC_CH_MASK);
+
+ if (test_and_set_bit(HSC_CH_OPEN, &channel->flags)) {
+ ret = -EBUSY;
+ goto out;
+ }
+ /*
+ * Check if we have already claimed the port associated to the HSI
+ * client. If not then try to claim it, else increase its refcount
+ */
+ if (cl_data->usecnt == 0) {
+ ret = hsi_claim_port(cl_data->cl, 0);
+ if (ret < 0)
+ goto out;
+ hsi_setup(cl_data->cl);
+ }
+ cl_data->usecnt++;
+
+ ret = hsc_msgs_alloc(channel);
+ if (ret < 0) {
+ __hsc_port_release(cl_data);
+ goto out;
+ }
+
+ file->private_data = channel;
+ mutex_unlock(&cl_data->lock);
+
+ return ret;
+out:
+ mutex_unlock(&cl_data->lock);
+
+ return ret;
+}
+
+static int hsc_release(struct inode *inode __maybe_unused, struct file *file)
+{
+ struct hsc_channel *channel = file->private_data;
+ struct hsc_client_data *cl_data = channel->cl_data;
+
+ mutex_lock(&cl_data->lock);
+ file->private_data = NULL;
+ if (test_and_clear_bit(HSC_CH_WLINE, &channel->flags))
+ hsi_stop_tx(channel->cl);
+ __hsc_port_release(cl_data);
+ hsc_reset_list(channel, &channel->rx_msgs_queue);
+ hsc_reset_list(channel, &channel->tx_msgs_queue);
+ hsc_reset_list(channel, &channel->free_msgs_list);
+ clear_bit(HSC_CH_READ, &channel->flags);
+ clear_bit(HSC_CH_WRITE, &channel->flags);
+ clear_bit(HSC_CH_OPEN, &channel->flags);
+ wake_up(&channel->rx_wait);
+ wake_up(&channel->tx_wait);
+ mutex_unlock(&cl_data->lock);
+
+ return 0;
+}
+
+static const struct file_operations hsc_fops = {
+ .owner = THIS_MODULE,
+ .read = hsc_read,
+ .write = hsc_write,
+ .unlocked_ioctl = hsc_ioctl,
+ .open = hsc_open,
+ .release = hsc_release,
+};
+
+static void hsc_channel_init(struct hsc_channel *channel)
+{
+ init_waitqueue_head(&channel->rx_wait);
+ init_waitqueue_head(&channel->tx_wait);
+ spin_lock_init(&channel->lock);
+ INIT_LIST_HEAD(&channel->free_msgs_list);
+ INIT_LIST_HEAD(&channel->rx_msgs_queue);
+ INIT_LIST_HEAD(&channel->tx_msgs_queue);
+}
+
+static int hsc_probe(struct device *dev)
+{
+ const char devname[] = "hsi_char";
+ struct hsc_client_data *cl_data;
+ struct hsc_channel *channel;
+ struct hsi_client *cl = to_hsi_client(dev);
+ unsigned int hsc_baseminor;
+ dev_t hsc_dev;
+ int ret;
+ int i;
+
+ cl_data = kzalloc(sizeof(*cl_data), GFP_KERNEL);
+ if (!cl_data)
+ return -ENOMEM;
+
+ hsc_baseminor = HSC_BASEMINOR(hsi_id(cl), hsi_port_id(cl));
+ if (!hsc_major) {
+ ret = alloc_chrdev_region(&hsc_dev, hsc_baseminor,
+ HSC_DEVS, devname);
+ if (ret == 0)
+ hsc_major = MAJOR(hsc_dev);
+ } else {
+ hsc_dev = MKDEV(hsc_major, hsc_baseminor);
+ ret = register_chrdev_region(hsc_dev, HSC_DEVS, devname);
+ }
+ if (ret < 0) {
+ dev_err(dev, "Device %s allocation failed %d\n",
+ hsc_major ? "minor" : "major", ret);
+ goto out1;
+ }
+ mutex_init(&cl_data->lock);
+ hsi_client_set_drvdata(cl, cl_data);
+ cdev_init(&cl_data->cdev, &hsc_fops);
+ cl_data->cdev.owner = THIS_MODULE;
+ cl_data->cl = cl;
+ for (i = 0, channel = cl_data->channels; i < HSC_DEVS; i++, channel++) {
+ hsc_channel_init(channel);
+ channel->ch = i;
+ channel->cl = cl;
+ channel->cl_data = cl_data;
+ }
+
+ /* 1 hsi client -> N char devices (one for each channel) */
+ ret = cdev_add(&cl_data->cdev, hsc_dev, HSC_DEVS);
+ if (ret) {
+ dev_err(dev, "Could not add char device %d\n", ret);
+ goto out2;
+ }
+
+ return 0;
+out2:
+ unregister_chrdev_region(hsc_dev, HSC_DEVS);
+out1:
+ kfree(cl_data);
+
+ return ret;
+}
+
+static int hsc_remove(struct device *dev)
+{
+ struct hsi_client *cl = to_hsi_client(dev);
+ struct hsc_client_data *cl_data = hsi_client_drvdata(cl);
+ dev_t hsc_dev = cl_data->cdev.dev;
+
+ cdev_del(&cl_data->cdev);
+ unregister_chrdev_region(hsc_dev, HSC_DEVS);
+ hsi_client_set_drvdata(cl, NULL);
+ kfree(cl_data);
+
+ return 0;
+}
+
+static struct hsi_client_driver hsc_driver = {
+ .driver = {
+ .name = "hsi_char",
+ .owner = THIS_MODULE,
+ .probe = hsc_probe,
+ .remove = hsc_remove,
+ },
+};
+
+static int __init hsc_init(void)
+{
+ int ret;
+
+ if ((max_data_size < 4) || (max_data_size > 0x10000) ||
+ (max_data_size & (max_data_size - 1))) {
+ pr_err("Invalid max read/write data size\n");
+ return -EINVAL;
+ }
+
+ ret = hsi_register_client_driver(&hsc_driver);
+ if (ret) {
+ pr_err("Error while registering HSI/SSI driver %d\n", ret);
+ return ret;
+ }
+
+ pr_info("HSI/SSI char device loaded\n");
+
+ return 0;
+}
+module_init(hsc_init);
+
+static void __exit hsc_exit(void)
+{
+ hsi_unregister_client_driver(&hsc_driver);
+ pr_info("HSI char device removed\n");
+}
+module_exit(hsc_exit);
+
+MODULE_AUTHOR("Andras Domokos <andras.domokos@nokia.com>");
+MODULE_ALIAS("hsi:hsi_char");
+MODULE_DESCRIPTION("HSI character device");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/hsi/clients/nokia-modem.c b/drivers/hsi/clients/nokia-modem.c
new file mode 100644
index 0000000..f78cca9
--- /dev/null
+++ b/drivers/hsi/clients/nokia-modem.c
@@ -0,0 +1,313 @@
+/*
+ * nokia-modem.c
+ *
+ * HSI client driver for Nokia N900 modem.
+ *
+ * Copyright (C) 2014 Sebastian Reichel <sre@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/gpio/consumer.h>
+#include <linux/hsi/hsi.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_gpio.h>
+#include <linux/hsi/ssi_protocol.h>
+
+static unsigned int pm = 1;
+module_param(pm, int, 0400);
+MODULE_PARM_DESC(pm,
+ "Enable power management (0=disabled, 1=userland based [default])");
+
+struct nokia_modem_gpio {
+ struct gpio_desc *gpio;
+ const char *name;
+};
+
+struct nokia_modem_device {
+ struct tasklet_struct nokia_modem_rst_ind_tasklet;
+ int nokia_modem_rst_ind_irq;
+ struct device *device;
+ struct nokia_modem_gpio *gpios;
+ int gpio_amount;
+ struct hsi_client *ssi_protocol;
+ struct hsi_client *cmt_speech;
+};
+
+static void do_nokia_modem_rst_ind_tasklet(unsigned long data)
+{
+ struct nokia_modem_device *modem = (struct nokia_modem_device *)data;
+
+ if (!modem)
+ return;
+
+ dev_info(modem->device, "CMT rst line change detected\n");
+
+ if (modem->ssi_protocol)
+ ssip_reset_event(modem->ssi_protocol);
+}
+
+static irqreturn_t nokia_modem_rst_ind_isr(int irq, void *data)
+{
+ struct nokia_modem_device *modem = (struct nokia_modem_device *)data;
+
+ tasklet_schedule(&modem->nokia_modem_rst_ind_tasklet);
+
+ return IRQ_HANDLED;
+}
+
+static void nokia_modem_gpio_unexport(struct device *dev)
+{
+ struct nokia_modem_device *modem = dev_get_drvdata(dev);
+ int i;
+
+ for (i = 0; i < modem->gpio_amount; i++) {
+ sysfs_remove_link(&dev->kobj, modem->gpios[i].name);
+ gpiod_unexport(modem->gpios[i].gpio);
+ }
+}
+
+static int nokia_modem_gpio_probe(struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ struct nokia_modem_device *modem = dev_get_drvdata(dev);
+ int gpio_count, gpio_name_count, i, err;
+
+ gpio_count = of_gpio_count(np);
+
+ if (gpio_count < 0) {
+ dev_err(dev, "missing gpios: %d\n", gpio_count);
+ return gpio_count;
+ }
+
+ gpio_name_count = of_property_count_strings(np, "gpio-names");
+
+ if (gpio_count != gpio_name_count) {
+ dev_err(dev, "number of gpios does not equal number of gpio names\n");
+ return -EINVAL;
+ }
+
+ modem->gpios = devm_kcalloc(dev, gpio_count, sizeof(*modem->gpios),
+ GFP_KERNEL);
+ if (!modem->gpios)
+ return -ENOMEM;
+
+ modem->gpio_amount = gpio_count;
+
+ for (i = 0; i < gpio_count; i++) {
+ modem->gpios[i].gpio = devm_gpiod_get_index(dev, NULL, i,
+ GPIOD_OUT_LOW);
+ if (IS_ERR(modem->gpios[i].gpio)) {
+ dev_err(dev, "Could not get gpio %d\n", i);
+ return PTR_ERR(modem->gpios[i].gpio);
+ }
+
+ err = of_property_read_string_index(np, "gpio-names", i,
+ &(modem->gpios[i].name));
+ if (err) {
+ dev_err(dev, "Could not get gpio name %d\n", i);
+ return err;
+ }
+
+ err = gpiod_export(modem->gpios[i].gpio, 0);
+ if (err)
+ return err;
+
+ err = gpiod_export_link(dev, modem->gpios[i].name,
+ modem->gpios[i].gpio);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+static int nokia_modem_probe(struct device *dev)
+{
+ struct device_node *np;
+ struct nokia_modem_device *modem;
+ struct hsi_client *cl = to_hsi_client(dev);
+ struct hsi_port *port = hsi_get_port(cl);
+ int irq, pflags, err;
+ struct hsi_board_info ssip;
+ struct hsi_board_info cmtspeech;
+
+ np = dev->of_node;
+ if (!np) {
+ dev_err(dev, "device tree node not found\n");
+ return -ENXIO;
+ }
+
+ modem = devm_kzalloc(dev, sizeof(*modem), GFP_KERNEL);
+ if (!modem)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev, modem);
+ modem->device = dev;
+
+ irq = irq_of_parse_and_map(np, 0);
+ if (!irq) {
+ dev_err(dev, "Invalid rst_ind interrupt (%d)\n", irq);
+ return -EINVAL;
+ }
+ modem->nokia_modem_rst_ind_irq = irq;
+ pflags = irq_get_trigger_type(irq);
+
+ tasklet_init(&modem->nokia_modem_rst_ind_tasklet,
+ do_nokia_modem_rst_ind_tasklet, (unsigned long)modem);
+ err = devm_request_irq(dev, irq, nokia_modem_rst_ind_isr,
+ pflags, "modem_rst_ind", modem);
+ if (err < 0) {
+ dev_err(dev, "Request rst_ind irq(%d) failed (flags %d)\n",
+ irq, pflags);
+ return err;
+ }
+ enable_irq_wake(irq);
+
+ if (pm) {
+ err = nokia_modem_gpio_probe(dev);
+ if (err < 0) {
+ dev_err(dev, "Could not probe GPIOs\n");
+ goto error1;
+ }
+ }
+
+ ssip.name = "ssi-protocol";
+ ssip.tx_cfg = cl->tx_cfg;
+ ssip.rx_cfg = cl->rx_cfg;
+ ssip.platform_data = NULL;
+ ssip.archdata = NULL;
+
+ modem->ssi_protocol = hsi_new_client(port, &ssip);
+ if (!modem->ssi_protocol) {
+ dev_err(dev, "Could not register ssi-protocol device\n");
+ err = -ENOMEM;
+ goto error2;
+ }
+
+ err = device_attach(&modem->ssi_protocol->device);
+ if (err == 0) {
+ dev_dbg(dev, "Missing ssi-protocol driver\n");
+ err = -EPROBE_DEFER;
+ goto error3;
+ } else if (err < 0) {
+ dev_err(dev, "Could not load ssi-protocol driver (%d)\n", err);
+ goto error3;
+ }
+
+ cmtspeech.name = "cmt-speech";
+ cmtspeech.tx_cfg = cl->tx_cfg;
+ cmtspeech.rx_cfg = cl->rx_cfg;
+ cmtspeech.platform_data = NULL;
+ cmtspeech.archdata = NULL;
+
+ modem->cmt_speech = hsi_new_client(port, &cmtspeech);
+ if (!modem->cmt_speech) {
+ dev_err(dev, "Could not register cmt-speech device\n");
+ err = -ENOMEM;
+ goto error3;
+ }
+
+ err = device_attach(&modem->cmt_speech->device);
+ if (err == 0) {
+ dev_dbg(dev, "Missing cmt-speech driver\n");
+ err = -EPROBE_DEFER;
+ goto error4;
+ } else if (err < 0) {
+ dev_err(dev, "Could not load cmt-speech driver (%d)\n", err);
+ goto error4;
+ }
+
+ dev_info(dev, "Registered Nokia HSI modem\n");
+
+ return 0;
+
+error4:
+ hsi_remove_client(&modem->cmt_speech->device, NULL);
+error3:
+ hsi_remove_client(&modem->ssi_protocol->device, NULL);
+error2:
+ nokia_modem_gpio_unexport(dev);
+error1:
+ disable_irq_wake(modem->nokia_modem_rst_ind_irq);
+ tasklet_kill(&modem->nokia_modem_rst_ind_tasklet);
+
+ return err;
+}
+
+static int nokia_modem_remove(struct device *dev)
+{
+ struct nokia_modem_device *modem = dev_get_drvdata(dev);
+
+ if (!modem)
+ return 0;
+
+ if (modem->cmt_speech) {
+ hsi_remove_client(&modem->cmt_speech->device, NULL);
+ modem->cmt_speech = NULL;
+ }
+
+ if (modem->ssi_protocol) {
+ hsi_remove_client(&modem->ssi_protocol->device, NULL);
+ modem->ssi_protocol = NULL;
+ }
+
+ nokia_modem_gpio_unexport(dev);
+ dev_set_drvdata(dev, NULL);
+ disable_irq_wake(modem->nokia_modem_rst_ind_irq);
+ tasklet_kill(&modem->nokia_modem_rst_ind_tasklet);
+
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id nokia_modem_of_match[] = {
+ { .compatible = "nokia,n900-modem", },
+ { .compatible = "nokia,n950-modem", },
+ { .compatible = "nokia,n9-modem", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, nokia_modem_of_match);
+#endif
+
+static struct hsi_client_driver nokia_modem_driver = {
+ .driver = {
+ .name = "nokia-modem",
+ .owner = THIS_MODULE,
+ .probe = nokia_modem_probe,
+ .remove = nokia_modem_remove,
+ .of_match_table = of_match_ptr(nokia_modem_of_match),
+ },
+};
+
+static int __init nokia_modem_init(void)
+{
+ return hsi_register_client_driver(&nokia_modem_driver);
+}
+module_init(nokia_modem_init);
+
+static void __exit nokia_modem_exit(void)
+{
+ hsi_unregister_client_driver(&nokia_modem_driver);
+}
+module_exit(nokia_modem_exit);
+
+MODULE_ALIAS("hsi:nokia-modem");
+MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");
+MODULE_DESCRIPTION("HSI driver module for Nokia N900 Modem");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hsi/clients/ssi_protocol.c b/drivers/hsi/clients/ssi_protocol.c
new file mode 100644
index 0000000..561abf7
--- /dev/null
+++ b/drivers/hsi/clients/ssi_protocol.c
@@ -0,0 +1,1202 @@
+/*
+ * ssi_protocol.c
+ *
+ * Implementation of the SSI McSAAB improved protocol.
+ *
+ * Copyright (C) 2010 Nokia Corporation. All rights reserved.
+ * Copyright (C) 2013 Sebastian Reichel <sre@kernel.org>
+ *
+ * Contact: Carlos Chinea <carlos.chinea@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/atomic.h>
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/if_ether.h>
+#include <linux/if_arp.h>
+#include <linux/if_phonet.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/notifier.h>
+#include <linux/scatterlist.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/timer.h>
+#include <linux/hsi/hsi.h>
+#include <linux/hsi/ssi_protocol.h>
+
+void ssi_waketest(struct hsi_client *cl, unsigned int enable);
+
+#define SSIP_TXQUEUE_LEN 100
+#define SSIP_MAX_MTU 65535
+#define SSIP_DEFAULT_MTU 4000
+#define PN_MEDIA_SOS 21
+#define SSIP_MIN_PN_HDR 6 /* FIXME: Revisit */
+#define SSIP_WDTOUT 2000 /* FIXME: has to be 500 msecs */
+#define SSIP_KATOUT 15 /* 15 msecs */
+#define SSIP_MAX_CMDS 5 /* Number of pre-allocated commands buffers */
+#define SSIP_BYTES_TO_FRAMES(x) ((((x) - 1) >> 2) + 1)
+#define SSIP_CMT_LOADER_SYNC 0x11223344
+/*
+ * SSI protocol command definitions
+ */
+#define SSIP_COMMAND(data) ((data) >> 28)
+#define SSIP_PAYLOAD(data) ((data) & 0xfffffff)
+/* Commands */
+#define SSIP_SW_BREAK 0
+#define SSIP_BOOTINFO_REQ 1
+#define SSIP_BOOTINFO_RESP 2
+#define SSIP_WAKETEST_RESULT 3
+#define SSIP_START_TRANS 4
+#define SSIP_READY 5
+/* Payloads */
+#define SSIP_DATA_VERSION(data) ((data) & 0xff)
+#define SSIP_LOCAL_VERID 1
+#define SSIP_WAKETEST_OK 0
+#define SSIP_WAKETEST_FAILED 1
+#define SSIP_PDU_LENGTH(data) (((data) >> 8) & 0xffff)
+#define SSIP_MSG_ID(data) ((data) & 0xff)
+/* Generic Command */
+#define SSIP_CMD(cmd, payload) (((cmd) << 28) | ((payload) & 0xfffffff))
+/* Commands for the control channel */
+#define SSIP_BOOTINFO_REQ_CMD(ver) \
+ SSIP_CMD(SSIP_BOOTINFO_REQ, SSIP_DATA_VERSION(ver))
+#define SSIP_BOOTINFO_RESP_CMD(ver) \
+ SSIP_CMD(SSIP_BOOTINFO_RESP, SSIP_DATA_VERSION(ver))
+#define SSIP_START_TRANS_CMD(pdulen, id) \
+ SSIP_CMD(SSIP_START_TRANS, (((pdulen) << 8) | SSIP_MSG_ID(id)))
+#define SSIP_READY_CMD SSIP_CMD(SSIP_READY, 0)
+#define SSIP_SWBREAK_CMD SSIP_CMD(SSIP_SW_BREAK, 0)
+
+#define SSIP_WAKETEST_FLAG 0
+
+/* Main state machine states */
+enum {
+ INIT,
+ HANDSHAKE,
+ ACTIVE,
+};
+
+/* Send state machine states */
+enum {
+ SEND_IDLE,
+ WAIT4READY,
+ SEND_READY,
+ SENDING,
+ SENDING_SWBREAK,
+};
+
+/* Receive state machine states */
+enum {
+ RECV_IDLE,
+ RECV_READY,
+ RECEIVING,
+};
+
+/**
+ * struct ssi_protocol - SSI protocol (McSAAB) data
+ * @main_state: Main state machine
+ * @send_state: TX state machine
+ * @recv_state: RX state machine
+ * @flags: Flags, currently only used to follow wake line test
+ * @rxid: RX data id
+ * @txid: TX data id
+ * @txqueue_len: TX queue length
+ * @tx_wd: TX watchdog
+ * @rx_wd: RX watchdog
+ * @keep_alive: Workaround for SSI HW bug
+ * @lock: To serialize access to this struct
+ * @netdev: Phonet network device
+ * @txqueue: TX data queue
+ * @cmdqueue: Queue of free commands
+ * @cl: HSI client own reference
+ * @link: Link for ssip_list
+ * @tx_usecount: Refcount to keep track the slaves that use the wake line
+ * @channel_id_cmd: HSI channel id for command stream
+ * @channel_id_data: HSI channel id for data stream
+ */
+struct ssi_protocol {
+ unsigned int main_state;
+ unsigned int send_state;
+ unsigned int recv_state;
+ unsigned long flags;
+ u8 rxid;
+ u8 txid;
+ unsigned int txqueue_len;
+ struct timer_list tx_wd;
+ struct timer_list rx_wd;
+ struct timer_list keep_alive; /* wake-up workaround */
+ spinlock_t lock;
+ struct net_device *netdev;
+ struct list_head txqueue;
+ struct list_head cmdqueue;
+ struct work_struct work;
+ struct hsi_client *cl;
+ struct list_head link;
+ atomic_t tx_usecnt;
+ int channel_id_cmd;
+ int channel_id_data;
+};
+
+/* List of ssi protocol instances */
+static LIST_HEAD(ssip_list);
+
+static void ssip_rxcmd_complete(struct hsi_msg *msg);
+
+static inline void ssip_set_cmd(struct hsi_msg *msg, u32 cmd)
+{
+ u32 *data;
+
+ data = sg_virt(msg->sgt.sgl);
+ *data = cmd;
+}
+
+static inline u32 ssip_get_cmd(struct hsi_msg *msg)
+{
+ u32 *data;
+
+ data = sg_virt(msg->sgt.sgl);
+
+ return *data;
+}
+
+static void ssip_skb_to_msg(struct sk_buff *skb, struct hsi_msg *msg)
+{
+ skb_frag_t *frag;
+ struct scatterlist *sg;
+ int i;
+
+ BUG_ON(msg->sgt.nents != (unsigned int)(skb_shinfo(skb)->nr_frags + 1));
+
+ sg = msg->sgt.sgl;
+ sg_set_buf(sg, skb->data, skb_headlen(skb));
+ for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
+ sg = sg_next(sg);
+ BUG_ON(!sg);
+ frag = &skb_shinfo(skb)->frags[i];
+ sg_set_page(sg, frag->page.p, frag->size, frag->page_offset);
+ }
+}
+
+static void ssip_free_data(struct hsi_msg *msg)
+{
+ struct sk_buff *skb;
+
+ skb = msg->context;
+ pr_debug("free data: msg %p context %p skb %p\n", msg, msg->context,
+ skb);
+ msg->destructor = NULL;
+ dev_kfree_skb(skb);
+ hsi_free_msg(msg);
+}
+
+static struct hsi_msg *ssip_alloc_data(struct ssi_protocol *ssi,
+ struct sk_buff *skb, gfp_t flags)
+{
+ struct hsi_msg *msg;
+
+ msg = hsi_alloc_msg(skb_shinfo(skb)->nr_frags + 1, flags);
+ if (!msg)
+ return NULL;
+ ssip_skb_to_msg(skb, msg);
+ msg->destructor = ssip_free_data;
+ msg->channel = ssi->channel_id_data;
+ msg->context = skb;
+
+ return msg;
+}
+
+static inline void ssip_release_cmd(struct hsi_msg *msg)
+{
+ struct ssi_protocol *ssi = hsi_client_drvdata(msg->cl);
+
+ dev_dbg(&msg->cl->device, "Release cmd 0x%08x\n", ssip_get_cmd(msg));
+ spin_lock_bh(&ssi->lock);
+ list_add_tail(&msg->link, &ssi->cmdqueue);
+ spin_unlock_bh(&ssi->lock);
+}
+
+static struct hsi_msg *ssip_claim_cmd(struct ssi_protocol *ssi)
+{
+ struct hsi_msg *msg;
+
+ BUG_ON(list_empty(&ssi->cmdqueue));
+
+ spin_lock_bh(&ssi->lock);
+ msg = list_first_entry(&ssi->cmdqueue, struct hsi_msg, link);
+ list_del(&msg->link);
+ spin_unlock_bh(&ssi->lock);
+ msg->destructor = ssip_release_cmd;
+
+ return msg;
+}
+
+static void ssip_free_cmds(struct ssi_protocol *ssi)
+{
+ struct hsi_msg *msg, *tmp;
+
+ list_for_each_entry_safe(msg, tmp, &ssi->cmdqueue, link) {
+ list_del(&msg->link);
+ msg->destructor = NULL;
+ kfree(sg_virt(msg->sgt.sgl));
+ hsi_free_msg(msg);
+ }
+}
+
+static int ssip_alloc_cmds(struct ssi_protocol *ssi)
+{
+ struct hsi_msg *msg;
+ u32 *buf;
+ unsigned int i;
+
+ for (i = 0; i < SSIP_MAX_CMDS; i++) {
+ msg = hsi_alloc_msg(1, GFP_KERNEL);
+ if (!msg)
+ goto out;
+ buf = kmalloc(sizeof(*buf), GFP_KERNEL);
+ if (!buf) {
+ hsi_free_msg(msg);
+ goto out;
+ }
+ sg_init_one(msg->sgt.sgl, buf, sizeof(*buf));
+ msg->channel = ssi->channel_id_cmd;
+ list_add_tail(&msg->link, &ssi->cmdqueue);
+ }
+
+ return 0;
+out:
+ ssip_free_cmds(ssi);
+
+ return -ENOMEM;
+}
+
+static void ssip_set_rxstate(struct ssi_protocol *ssi, unsigned int state)
+{
+ ssi->recv_state = state;
+ switch (state) {
+ case RECV_IDLE:
+ del_timer(&ssi->rx_wd);
+ if (ssi->send_state == SEND_IDLE)
+ del_timer(&ssi->keep_alive);
+ break;
+ case RECV_READY:
+ /* CMT speech workaround */
+ if (atomic_read(&ssi->tx_usecnt))
+ break;
+ /* Otherwise fall through */
+ case RECEIVING:
+ mod_timer(&ssi->keep_alive, jiffies +
+ msecs_to_jiffies(SSIP_KATOUT));
+ mod_timer(&ssi->rx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT));
+ break;
+ default:
+ break;
+ }
+}
+
+static void ssip_set_txstate(struct ssi_protocol *ssi, unsigned int state)
+{
+ ssi->send_state = state;
+ switch (state) {
+ case SEND_IDLE:
+ case SEND_READY:
+ del_timer(&ssi->tx_wd);
+ if (ssi->recv_state == RECV_IDLE)
+ del_timer(&ssi->keep_alive);
+ break;
+ case WAIT4READY:
+ case SENDING:
+ case SENDING_SWBREAK:
+ mod_timer(&ssi->keep_alive,
+ jiffies + msecs_to_jiffies(SSIP_KATOUT));
+ mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT));
+ break;
+ default:
+ break;
+ }
+}
+
+struct hsi_client *ssip_slave_get_master(struct hsi_client *slave)
+{
+ struct hsi_client *master = ERR_PTR(-ENODEV);
+ struct ssi_protocol *ssi;
+
+ list_for_each_entry(ssi, &ssip_list, link)
+ if (slave->device.parent == ssi->cl->device.parent) {
+ master = ssi->cl;
+ break;
+ }
+
+ return master;
+}
+EXPORT_SYMBOL_GPL(ssip_slave_get_master);
+
+int ssip_slave_start_tx(struct hsi_client *master)
+{
+ struct ssi_protocol *ssi = hsi_client_drvdata(master);
+
+ dev_dbg(&master->device, "start TX %d\n", atomic_read(&ssi->tx_usecnt));
+ spin_lock_bh(&ssi->lock);
+ if (ssi->send_state == SEND_IDLE) {
+ ssip_set_txstate(ssi, WAIT4READY);
+ hsi_start_tx(master);
+ }
+ spin_unlock_bh(&ssi->lock);
+ atomic_inc(&ssi->tx_usecnt);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ssip_slave_start_tx);
+
+int ssip_slave_stop_tx(struct hsi_client *master)
+{
+ struct ssi_protocol *ssi = hsi_client_drvdata(master);
+
+ WARN_ON_ONCE(atomic_read(&ssi->tx_usecnt) == 0);
+
+ if (atomic_dec_and_test(&ssi->tx_usecnt)) {
+ spin_lock_bh(&ssi->lock);
+ if ((ssi->send_state == SEND_READY) ||
+ (ssi->send_state == WAIT4READY)) {
+ ssip_set_txstate(ssi, SEND_IDLE);
+ hsi_stop_tx(master);
+ }
+ spin_unlock_bh(&ssi->lock);
+ }
+ dev_dbg(&master->device, "stop TX %d\n", atomic_read(&ssi->tx_usecnt));
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ssip_slave_stop_tx);
+
+int ssip_slave_running(struct hsi_client *master)
+{
+ struct ssi_protocol *ssi = hsi_client_drvdata(master);
+ return netif_running(ssi->netdev);
+}
+EXPORT_SYMBOL_GPL(ssip_slave_running);
+
+static void ssip_reset(struct hsi_client *cl)
+{
+ struct ssi_protocol *ssi = hsi_client_drvdata(cl);
+ struct list_head *head, *tmp;
+ struct hsi_msg *msg;
+
+ if (netif_running(ssi->netdev))
+ netif_carrier_off(ssi->netdev);
+ hsi_flush(cl);
+ spin_lock_bh(&ssi->lock);
+ if (ssi->send_state != SEND_IDLE)
+ hsi_stop_tx(cl);
+ spin_unlock_bh(&ssi->lock);
+ if (test_and_clear_bit(SSIP_WAKETEST_FLAG, &ssi->flags))
+ ssi_waketest(cl, 0); /* FIXME: To be removed */
+ spin_lock_bh(&ssi->lock);
+ del_timer(&ssi->rx_wd);
+ del_timer(&ssi->tx_wd);
+ del_timer(&ssi->keep_alive);
+ ssi->main_state = 0;
+ ssi->send_state = 0;
+ ssi->recv_state = 0;
+ ssi->flags = 0;
+ ssi->rxid = 0;
+ ssi->txid = 0;
+ list_for_each_safe(head, tmp, &ssi->txqueue) {
+ msg = list_entry(head, struct hsi_msg, link);
+ dev_dbg(&cl->device, "Pending TX data\n");
+ list_del(head);
+ ssip_free_data(msg);
+ }
+ ssi->txqueue_len = 0;
+ spin_unlock_bh(&ssi->lock);
+}
+
+static void ssip_dump_state(struct hsi_client *cl)
+{
+ struct ssi_protocol *ssi = hsi_client_drvdata(cl);
+ struct hsi_msg *msg;
+
+ spin_lock_bh(&ssi->lock);
+ dev_err(&cl->device, "Main state: %d\n", ssi->main_state);
+ dev_err(&cl->device, "Recv state: %d\n", ssi->recv_state);
+ dev_err(&cl->device, "Send state: %d\n", ssi->send_state);
+ dev_err(&cl->device, "CMT %s\n", (ssi->main_state == ACTIVE) ?
+ "Online" : "Offline");
+ dev_err(&cl->device, "Wake test %d\n",
+ test_bit(SSIP_WAKETEST_FLAG, &ssi->flags));
+ dev_err(&cl->device, "Data RX id: %d\n", ssi->rxid);
+ dev_err(&cl->device, "Data TX id: %d\n", ssi->txid);
+
+ list_for_each_entry(msg, &ssi->txqueue, link)
+ dev_err(&cl->device, "pending TX data (%p)\n", msg);
+ spin_unlock_bh(&ssi->lock);
+}
+
+static void ssip_error(struct hsi_client *cl)
+{
+ struct ssi_protocol *ssi = hsi_client_drvdata(cl);
+ struct hsi_msg *msg;
+
+ ssip_dump_state(cl);
+ ssip_reset(cl);
+ msg = ssip_claim_cmd(ssi);
+ msg->complete = ssip_rxcmd_complete;
+ hsi_async_read(cl, msg);
+}
+
+static void ssip_keep_alive(struct timer_list *t)
+{
+ struct ssi_protocol *ssi = from_timer(ssi, t, keep_alive);
+ struct hsi_client *cl = ssi->cl;
+
+ dev_dbg(&cl->device, "Keep alive kick in: m(%d) r(%d) s(%d)\n",
+ ssi->main_state, ssi->recv_state, ssi->send_state);
+
+ spin_lock(&ssi->lock);
+ if (ssi->recv_state == RECV_IDLE)
+ switch (ssi->send_state) {
+ case SEND_READY:
+ if (atomic_read(&ssi->tx_usecnt) == 0)
+ break;
+ /*
+ * Fall through. Workaround for cmt-speech
+ * in that case we relay on audio timers.
+ */
+ case SEND_IDLE:
+ spin_unlock(&ssi->lock);
+ return;
+ }
+ mod_timer(&ssi->keep_alive, jiffies + msecs_to_jiffies(SSIP_KATOUT));
+ spin_unlock(&ssi->lock);
+}
+
+static void ssip_rx_wd(struct timer_list *t)
+{
+ struct ssi_protocol *ssi = from_timer(ssi, t, rx_wd);
+ struct hsi_client *cl = ssi->cl;
+
+ dev_err(&cl->device, "Watchdog triggered\n");
+ ssip_error(cl);
+}
+
+static void ssip_tx_wd(struct timer_list *t)
+{
+ struct ssi_protocol *ssi = from_timer(ssi, t, tx_wd);
+ struct hsi_client *cl = ssi->cl;
+
+ dev_err(&cl->device, "Watchdog triggered\n");
+ ssip_error(cl);
+}
+
+static void ssip_send_bootinfo_req_cmd(struct hsi_client *cl)
+{
+ struct ssi_protocol *ssi = hsi_client_drvdata(cl);
+ struct hsi_msg *msg;
+
+ dev_dbg(&cl->device, "Issuing BOOT INFO REQ command\n");
+ msg = ssip_claim_cmd(ssi);
+ ssip_set_cmd(msg, SSIP_BOOTINFO_REQ_CMD(SSIP_LOCAL_VERID));
+ msg->complete = ssip_release_cmd;
+ hsi_async_write(cl, msg);
+ dev_dbg(&cl->device, "Issuing RX command\n");
+ msg = ssip_claim_cmd(ssi);
+ msg->complete = ssip_rxcmd_complete;
+ hsi_async_read(cl, msg);
+}
+
+static void ssip_start_rx(struct hsi_client *cl)
+{
+ struct ssi_protocol *ssi = hsi_client_drvdata(cl);
+ struct hsi_msg *msg;
+
+ dev_dbg(&cl->device, "RX start M(%d) R(%d)\n", ssi->main_state,
+ ssi->recv_state);
+ spin_lock_bh(&ssi->lock);
+ /*
+ * We can have two UP events in a row due to a short low
+ * high transition. Therefore we need to ignore the sencond UP event.
+ */
+ if ((ssi->main_state != ACTIVE) || (ssi->recv_state == RECV_READY)) {
+ spin_unlock_bh(&ssi->lock);
+ return;
+ }
+ ssip_set_rxstate(ssi, RECV_READY);
+ spin_unlock_bh(&ssi->lock);
+
+ msg = ssip_claim_cmd(ssi);
+ ssip_set_cmd(msg, SSIP_READY_CMD);
+ msg->complete = ssip_release_cmd;
+ dev_dbg(&cl->device, "Send READY\n");
+ hsi_async_write(cl, msg);
+}
+
+static void ssip_stop_rx(struct hsi_client *cl)
+{
+ struct ssi_protocol *ssi = hsi_client_drvdata(cl);
+
+ dev_dbg(&cl->device, "RX stop M(%d)\n", ssi->main_state);
+ spin_lock_bh(&ssi->lock);
+ if (likely(ssi->main_state == ACTIVE))
+ ssip_set_rxstate(ssi, RECV_IDLE);
+ spin_unlock_bh(&ssi->lock);
+}
+
+static void ssip_free_strans(struct hsi_msg *msg)
+{
+ ssip_free_data(msg->context);
+ ssip_release_cmd(msg);
+}
+
+static void ssip_strans_complete(struct hsi_msg *msg)
+{
+ struct hsi_client *cl = msg->cl;
+ struct ssi_protocol *ssi = hsi_client_drvdata(cl);
+ struct hsi_msg *data;
+
+ data = msg->context;
+ ssip_release_cmd(msg);
+ spin_lock_bh(&ssi->lock);
+ ssip_set_txstate(ssi, SENDING);
+ spin_unlock_bh(&ssi->lock);
+ hsi_async_write(cl, data);
+}
+
+static int ssip_xmit(struct hsi_client *cl)
+{
+ struct ssi_protocol *ssi = hsi_client_drvdata(cl);
+ struct hsi_msg *msg, *dmsg;
+ struct sk_buff *skb;
+
+ spin_lock_bh(&ssi->lock);
+ if (list_empty(&ssi->txqueue)) {
+ spin_unlock_bh(&ssi->lock);
+ return 0;
+ }
+ dmsg = list_first_entry(&ssi->txqueue, struct hsi_msg, link);
+ list_del(&dmsg->link);
+ ssi->txqueue_len--;
+ spin_unlock_bh(&ssi->lock);
+
+ msg = ssip_claim_cmd(ssi);
+ skb = dmsg->context;
+ msg->context = dmsg;
+ msg->complete = ssip_strans_complete;
+ msg->destructor = ssip_free_strans;
+
+ spin_lock_bh(&ssi->lock);
+ ssip_set_cmd(msg, SSIP_START_TRANS_CMD(SSIP_BYTES_TO_FRAMES(skb->len),
+ ssi->txid));
+ ssi->txid++;
+ ssip_set_txstate(ssi, SENDING);
+ spin_unlock_bh(&ssi->lock);
+
+ dev_dbg(&cl->device, "Send STRANS (%d frames)\n",
+ SSIP_BYTES_TO_FRAMES(skb->len));
+
+ return hsi_async_write(cl, msg);
+}
+
+/* In soft IRQ context */
+static void ssip_pn_rx(struct sk_buff *skb)
+{
+ struct net_device *dev = skb->dev;
+
+ if (unlikely(!netif_running(dev))) {
+ dev_dbg(&dev->dev, "Drop RX packet\n");
+ dev->stats.rx_dropped++;
+ dev_kfree_skb(skb);
+ return;
+ }
+ if (unlikely(!pskb_may_pull(skb, SSIP_MIN_PN_HDR))) {
+ dev_dbg(&dev->dev, "Error drop RX packet\n");
+ dev->stats.rx_errors++;
+ dev->stats.rx_length_errors++;
+ dev_kfree_skb(skb);
+ return;
+ }
+ dev->stats.rx_packets++;
+ dev->stats.rx_bytes += skb->len;
+
+ /* length field is exchanged in network byte order */
+ ((u16 *)skb->data)[2] = ntohs(((u16 *)skb->data)[2]);
+ dev_dbg(&dev->dev, "RX length fixed (%04x -> %u)\n",
+ ((u16 *)skb->data)[2], ntohs(((u16 *)skb->data)[2]));
+
+ skb->protocol = htons(ETH_P_PHONET);
+ skb_reset_mac_header(skb);
+ __skb_pull(skb, 1);
+ netif_rx(skb);
+}
+
+static void ssip_rx_data_complete(struct hsi_msg *msg)
+{
+ struct hsi_client *cl = msg->cl;
+ struct ssi_protocol *ssi = hsi_client_drvdata(cl);
+ struct sk_buff *skb;
+
+ if (msg->status == HSI_STATUS_ERROR) {
+ dev_err(&cl->device, "RX data error\n");
+ ssip_free_data(msg);
+ ssip_error(cl);
+ return;
+ }
+ del_timer(&ssi->rx_wd); /* FIXME: Revisit */
+ skb = msg->context;
+ ssip_pn_rx(skb);
+ hsi_free_msg(msg);
+}
+
+static void ssip_rx_bootinforeq(struct hsi_client *cl, u32 cmd)
+{
+ struct ssi_protocol *ssi = hsi_client_drvdata(cl);
+ struct hsi_msg *msg;
+
+ /* Workaroud: Ignore CMT Loader message leftover */
+ if (cmd == SSIP_CMT_LOADER_SYNC)
+ return;
+
+ switch (ssi->main_state) {
+ case ACTIVE:
+ dev_err(&cl->device, "Boot info req on active state\n");
+ ssip_error(cl);
+ /* Fall through */
+ case INIT:
+ case HANDSHAKE:
+ spin_lock_bh(&ssi->lock);
+ ssi->main_state = HANDSHAKE;
+ spin_unlock_bh(&ssi->lock);
+
+ if (!test_and_set_bit(SSIP_WAKETEST_FLAG, &ssi->flags))
+ ssi_waketest(cl, 1); /* FIXME: To be removed */
+
+ spin_lock_bh(&ssi->lock);
+ /* Start boot handshake watchdog */
+ mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT));
+ spin_unlock_bh(&ssi->lock);
+ dev_dbg(&cl->device, "Send BOOTINFO_RESP\n");
+ if (SSIP_DATA_VERSION(cmd) != SSIP_LOCAL_VERID)
+ dev_warn(&cl->device, "boot info req verid mismatch\n");
+ msg = ssip_claim_cmd(ssi);
+ ssip_set_cmd(msg, SSIP_BOOTINFO_RESP_CMD(SSIP_LOCAL_VERID));
+ msg->complete = ssip_release_cmd;
+ hsi_async_write(cl, msg);
+ break;
+ default:
+ dev_dbg(&cl->device, "Wrong state M(%d)\n", ssi->main_state);
+ break;
+ }
+}
+
+static void ssip_rx_bootinforesp(struct hsi_client *cl, u32 cmd)
+{
+ struct ssi_protocol *ssi = hsi_client_drvdata(cl);
+
+ if (SSIP_DATA_VERSION(cmd) != SSIP_LOCAL_VERID)
+ dev_warn(&cl->device, "boot info resp verid mismatch\n");
+
+ spin_lock_bh(&ssi->lock);
+ if (ssi->main_state != ACTIVE)
+ /* Use tx_wd as a boot watchdog in non ACTIVE state */
+ mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT));
+ else
+ dev_dbg(&cl->device, "boot info resp ignored M(%d)\n",
+ ssi->main_state);
+ spin_unlock_bh(&ssi->lock);
+}
+
+static void ssip_rx_waketest(struct hsi_client *cl, u32 cmd)
+{
+ struct ssi_protocol *ssi = hsi_client_drvdata(cl);
+ unsigned int wkres = SSIP_PAYLOAD(cmd);
+
+ spin_lock_bh(&ssi->lock);
+ if (ssi->main_state != HANDSHAKE) {
+ dev_dbg(&cl->device, "wake lines test ignored M(%d)\n",
+ ssi->main_state);
+ spin_unlock_bh(&ssi->lock);
+ return;
+ }
+ spin_unlock_bh(&ssi->lock);
+
+ if (test_and_clear_bit(SSIP_WAKETEST_FLAG, &ssi->flags))
+ ssi_waketest(cl, 0); /* FIXME: To be removed */
+
+ spin_lock_bh(&ssi->lock);
+ ssi->main_state = ACTIVE;
+ del_timer(&ssi->tx_wd); /* Stop boot handshake timer */
+ spin_unlock_bh(&ssi->lock);
+
+ dev_notice(&cl->device, "WAKELINES TEST %s\n",
+ wkres & SSIP_WAKETEST_FAILED ? "FAILED" : "OK");
+ if (wkres & SSIP_WAKETEST_FAILED) {
+ ssip_error(cl);
+ return;
+ }
+ dev_dbg(&cl->device, "CMT is ONLINE\n");
+ netif_wake_queue(ssi->netdev);
+ netif_carrier_on(ssi->netdev);
+}
+
+static void ssip_rx_ready(struct hsi_client *cl)
+{
+ struct ssi_protocol *ssi = hsi_client_drvdata(cl);
+
+ spin_lock_bh(&ssi->lock);
+ if (unlikely(ssi->main_state != ACTIVE)) {
+ dev_dbg(&cl->device, "READY on wrong state: S(%d) M(%d)\n",
+ ssi->send_state, ssi->main_state);
+ spin_unlock_bh(&ssi->lock);
+ return;
+ }
+ if (ssi->send_state != WAIT4READY) {
+ dev_dbg(&cl->device, "Ignore spurious READY command\n");
+ spin_unlock_bh(&ssi->lock);
+ return;
+ }
+ ssip_set_txstate(ssi, SEND_READY);
+ spin_unlock_bh(&ssi->lock);
+ ssip_xmit(cl);
+}
+
+static void ssip_rx_strans(struct hsi_client *cl, u32 cmd)
+{
+ struct ssi_protocol *ssi = hsi_client_drvdata(cl);
+ struct sk_buff *skb;
+ struct hsi_msg *msg;
+ int len = SSIP_PDU_LENGTH(cmd);
+
+ dev_dbg(&cl->device, "RX strans: %d frames\n", len);
+ spin_lock_bh(&ssi->lock);
+ if (unlikely(ssi->main_state != ACTIVE)) {
+ dev_err(&cl->device, "START TRANS wrong state: S(%d) M(%d)\n",
+ ssi->send_state, ssi->main_state);
+ spin_unlock_bh(&ssi->lock);
+ return;
+ }
+ ssip_set_rxstate(ssi, RECEIVING);
+ if (unlikely(SSIP_MSG_ID(cmd) != ssi->rxid)) {
+ dev_err(&cl->device, "START TRANS id %d expected %d\n",
+ SSIP_MSG_ID(cmd), ssi->rxid);
+ spin_unlock_bh(&ssi->lock);
+ goto out1;
+ }
+ ssi->rxid++;
+ spin_unlock_bh(&ssi->lock);
+ skb = netdev_alloc_skb(ssi->netdev, len * 4);
+ if (unlikely(!skb)) {
+ dev_err(&cl->device, "No memory for rx skb\n");
+ goto out1;
+ }
+ skb->dev = ssi->netdev;
+ skb_put(skb, len * 4);
+ msg = ssip_alloc_data(ssi, skb, GFP_ATOMIC);
+ if (unlikely(!msg)) {
+ dev_err(&cl->device, "No memory for RX data msg\n");
+ goto out2;
+ }
+ msg->complete = ssip_rx_data_complete;
+ hsi_async_read(cl, msg);
+
+ return;
+out2:
+ dev_kfree_skb(skb);
+out1:
+ ssip_error(cl);
+}
+
+static void ssip_rxcmd_complete(struct hsi_msg *msg)
+{
+ struct hsi_client *cl = msg->cl;
+ u32 cmd = ssip_get_cmd(msg);
+ unsigned int cmdid = SSIP_COMMAND(cmd);
+
+ if (msg->status == HSI_STATUS_ERROR) {
+ dev_err(&cl->device, "RX error detected\n");
+ ssip_release_cmd(msg);
+ ssip_error(cl);
+ return;
+ }
+ hsi_async_read(cl, msg);
+ dev_dbg(&cl->device, "RX cmd: 0x%08x\n", cmd);
+ switch (cmdid) {
+ case SSIP_SW_BREAK:
+ /* Ignored */
+ break;
+ case SSIP_BOOTINFO_REQ:
+ ssip_rx_bootinforeq(cl, cmd);
+ break;
+ case SSIP_BOOTINFO_RESP:
+ ssip_rx_bootinforesp(cl, cmd);
+ break;
+ case SSIP_WAKETEST_RESULT:
+ ssip_rx_waketest(cl, cmd);
+ break;
+ case SSIP_START_TRANS:
+ ssip_rx_strans(cl, cmd);
+ break;
+ case SSIP_READY:
+ ssip_rx_ready(cl);
+ break;
+ default:
+ dev_warn(&cl->device, "command 0x%08x not supported\n", cmd);
+ break;
+ }
+}
+
+static void ssip_swbreak_complete(struct hsi_msg *msg)
+{
+ struct hsi_client *cl = msg->cl;
+ struct ssi_protocol *ssi = hsi_client_drvdata(cl);
+
+ ssip_release_cmd(msg);
+ spin_lock_bh(&ssi->lock);
+ if (list_empty(&ssi->txqueue)) {
+ if (atomic_read(&ssi->tx_usecnt)) {
+ ssip_set_txstate(ssi, SEND_READY);
+ } else {
+ ssip_set_txstate(ssi, SEND_IDLE);
+ hsi_stop_tx(cl);
+ }
+ spin_unlock_bh(&ssi->lock);
+ } else {
+ spin_unlock_bh(&ssi->lock);
+ ssip_xmit(cl);
+ }
+ netif_wake_queue(ssi->netdev);
+}
+
+static void ssip_tx_data_complete(struct hsi_msg *msg)
+{
+ struct hsi_client *cl = msg->cl;
+ struct ssi_protocol *ssi = hsi_client_drvdata(cl);
+ struct hsi_msg *cmsg;
+
+ if (msg->status == HSI_STATUS_ERROR) {
+ dev_err(&cl->device, "TX data error\n");
+ ssip_error(cl);
+ goto out;
+ }
+ spin_lock_bh(&ssi->lock);
+ if (list_empty(&ssi->txqueue)) {
+ ssip_set_txstate(ssi, SENDING_SWBREAK);
+ spin_unlock_bh(&ssi->lock);
+ cmsg = ssip_claim_cmd(ssi);
+ ssip_set_cmd(cmsg, SSIP_SWBREAK_CMD);
+ cmsg->complete = ssip_swbreak_complete;
+ dev_dbg(&cl->device, "Send SWBREAK\n");
+ hsi_async_write(cl, cmsg);
+ } else {
+ spin_unlock_bh(&ssi->lock);
+ ssip_xmit(cl);
+ }
+out:
+ ssip_free_data(msg);
+}
+
+static void ssip_port_event(struct hsi_client *cl, unsigned long event)
+{
+ switch (event) {
+ case HSI_EVENT_START_RX:
+ ssip_start_rx(cl);
+ break;
+ case HSI_EVENT_STOP_RX:
+ ssip_stop_rx(cl);
+ break;
+ default:
+ return;
+ }
+}
+
+static int ssip_pn_open(struct net_device *dev)
+{
+ struct hsi_client *cl = to_hsi_client(dev->dev.parent);
+ struct ssi_protocol *ssi = hsi_client_drvdata(cl);
+ int err;
+
+ err = hsi_claim_port(cl, 1);
+ if (err < 0) {
+ dev_err(&cl->device, "SSI port already claimed\n");
+ return err;
+ }
+ err = hsi_register_port_event(cl, ssip_port_event);
+ if (err < 0) {
+ dev_err(&cl->device, "Register HSI port event failed (%d)\n",
+ err);
+ return err;
+ }
+ dev_dbg(&cl->device, "Configuring SSI port\n");
+ hsi_setup(cl);
+
+ if (!test_and_set_bit(SSIP_WAKETEST_FLAG, &ssi->flags))
+ ssi_waketest(cl, 1); /* FIXME: To be removed */
+
+ spin_lock_bh(&ssi->lock);
+ ssi->main_state = HANDSHAKE;
+ spin_unlock_bh(&ssi->lock);
+
+ ssip_send_bootinfo_req_cmd(cl);
+
+ return 0;
+}
+
+static int ssip_pn_stop(struct net_device *dev)
+{
+ struct hsi_client *cl = to_hsi_client(dev->dev.parent);
+
+ ssip_reset(cl);
+ hsi_unregister_port_event(cl);
+ hsi_release_port(cl);
+
+ return 0;
+}
+
+static void ssip_xmit_work(struct work_struct *work)
+{
+ struct ssi_protocol *ssi =
+ container_of(work, struct ssi_protocol, work);
+ struct hsi_client *cl = ssi->cl;
+
+ ssip_xmit(cl);
+}
+
+static int ssip_pn_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct hsi_client *cl = to_hsi_client(dev->dev.parent);
+ struct ssi_protocol *ssi = hsi_client_drvdata(cl);
+ struct hsi_msg *msg;
+
+ if ((skb->protocol != htons(ETH_P_PHONET)) ||
+ (skb->len < SSIP_MIN_PN_HDR))
+ goto drop;
+ /* Pad to 32-bits - FIXME: Revisit*/
+ if ((skb->len & 3) && skb_pad(skb, 4 - (skb->len & 3)))
+ goto inc_dropped;
+
+ /*
+ * Modem sends Phonet messages over SSI with its own endianness.
+ * Assume that modem has the same endianness as we do.
+ */
+ if (skb_cow_head(skb, 0))
+ goto drop;
+
+ /* length field is exchanged in network byte order */
+ ((u16 *)skb->data)[2] = htons(((u16 *)skb->data)[2]);
+
+ msg = ssip_alloc_data(ssi, skb, GFP_ATOMIC);
+ if (!msg) {
+ dev_dbg(&cl->device, "Dropping tx data: No memory\n");
+ goto drop;
+ }
+ msg->complete = ssip_tx_data_complete;
+
+ spin_lock_bh(&ssi->lock);
+ if (unlikely(ssi->main_state != ACTIVE)) {
+ spin_unlock_bh(&ssi->lock);
+ dev_dbg(&cl->device, "Dropping tx data: CMT is OFFLINE\n");
+ goto drop2;
+ }
+ list_add_tail(&msg->link, &ssi->txqueue);
+ ssi->txqueue_len++;
+ if (dev->tx_queue_len < ssi->txqueue_len) {
+ dev_info(&cl->device, "TX queue full %d\n", ssi->txqueue_len);
+ netif_stop_queue(dev);
+ }
+ if (ssi->send_state == SEND_IDLE) {
+ ssip_set_txstate(ssi, WAIT4READY);
+ spin_unlock_bh(&ssi->lock);
+ dev_dbg(&cl->device, "Start TX qlen %d\n", ssi->txqueue_len);
+ hsi_start_tx(cl);
+ } else if (ssi->send_state == SEND_READY) {
+ /* Needed for cmt-speech workaround */
+ dev_dbg(&cl->device, "Start TX on SEND READY qlen %d\n",
+ ssi->txqueue_len);
+ spin_unlock_bh(&ssi->lock);
+ schedule_work(&ssi->work);
+ } else {
+ spin_unlock_bh(&ssi->lock);
+ }
+ dev->stats.tx_packets++;
+ dev->stats.tx_bytes += skb->len;
+
+ return 0;
+drop2:
+ hsi_free_msg(msg);
+drop:
+ dev_kfree_skb(skb);
+inc_dropped:
+ dev->stats.tx_dropped++;
+
+ return 0;
+}
+
+/* CMT reset event handler */
+void ssip_reset_event(struct hsi_client *master)
+{
+ struct ssi_protocol *ssi = hsi_client_drvdata(master);
+ dev_err(&ssi->cl->device, "CMT reset detected!\n");
+ ssip_error(ssi->cl);
+}
+EXPORT_SYMBOL_GPL(ssip_reset_event);
+
+static const struct net_device_ops ssip_pn_ops = {
+ .ndo_open = ssip_pn_open,
+ .ndo_stop = ssip_pn_stop,
+ .ndo_start_xmit = ssip_pn_xmit,
+};
+
+static void ssip_pn_setup(struct net_device *dev)
+{
+ dev->features = 0;
+ dev->netdev_ops = &ssip_pn_ops;
+ dev->type = ARPHRD_PHONET;
+ dev->flags = IFF_POINTOPOINT | IFF_NOARP;
+ dev->mtu = SSIP_DEFAULT_MTU;
+ dev->hard_header_len = 1;
+ dev->dev_addr[0] = PN_MEDIA_SOS;
+ dev->addr_len = 1;
+ dev->tx_queue_len = SSIP_TXQUEUE_LEN;
+
+ dev->needs_free_netdev = true;
+ dev->header_ops = &phonet_header_ops;
+}
+
+static int ssi_protocol_probe(struct device *dev)
+{
+ static const char ifname[] = "phonet%d";
+ struct hsi_client *cl = to_hsi_client(dev);
+ struct ssi_protocol *ssi;
+ int err;
+
+ ssi = kzalloc(sizeof(*ssi), GFP_KERNEL);
+ if (!ssi)
+ return -ENOMEM;
+
+ spin_lock_init(&ssi->lock);
+ timer_setup(&ssi->rx_wd, ssip_rx_wd, TIMER_DEFERRABLE);
+ timer_setup(&ssi->tx_wd, ssip_tx_wd, TIMER_DEFERRABLE);
+ timer_setup(&ssi->keep_alive, ssip_keep_alive, 0);
+ INIT_LIST_HEAD(&ssi->txqueue);
+ INIT_LIST_HEAD(&ssi->cmdqueue);
+ atomic_set(&ssi->tx_usecnt, 0);
+ hsi_client_set_drvdata(cl, ssi);
+ ssi->cl = cl;
+ INIT_WORK(&ssi->work, ssip_xmit_work);
+
+ ssi->channel_id_cmd = hsi_get_channel_id_by_name(cl, "mcsaab-control");
+ if (ssi->channel_id_cmd < 0) {
+ err = ssi->channel_id_cmd;
+ dev_err(dev, "Could not get cmd channel (%d)\n", err);
+ goto out;
+ }
+
+ ssi->channel_id_data = hsi_get_channel_id_by_name(cl, "mcsaab-data");
+ if (ssi->channel_id_data < 0) {
+ err = ssi->channel_id_data;
+ dev_err(dev, "Could not get data channel (%d)\n", err);
+ goto out;
+ }
+
+ err = ssip_alloc_cmds(ssi);
+ if (err < 0) {
+ dev_err(dev, "No memory for commands\n");
+ goto out;
+ }
+
+ ssi->netdev = alloc_netdev(0, ifname, NET_NAME_UNKNOWN, ssip_pn_setup);
+ if (!ssi->netdev) {
+ dev_err(dev, "No memory for netdev\n");
+ err = -ENOMEM;
+ goto out1;
+ }
+
+ /* MTU range: 6 - 65535 */
+ ssi->netdev->min_mtu = PHONET_MIN_MTU;
+ ssi->netdev->max_mtu = SSIP_MAX_MTU;
+
+ SET_NETDEV_DEV(ssi->netdev, dev);
+ netif_carrier_off(ssi->netdev);
+ err = register_netdev(ssi->netdev);
+ if (err < 0) {
+ dev_err(dev, "Register netdev failed (%d)\n", err);
+ goto out2;
+ }
+
+ list_add(&ssi->link, &ssip_list);
+
+ dev_dbg(dev, "channel configuration: cmd=%d, data=%d\n",
+ ssi->channel_id_cmd, ssi->channel_id_data);
+
+ return 0;
+out2:
+ free_netdev(ssi->netdev);
+out1:
+ ssip_free_cmds(ssi);
+out:
+ kfree(ssi);
+
+ return err;
+}
+
+static int ssi_protocol_remove(struct device *dev)
+{
+ struct hsi_client *cl = to_hsi_client(dev);
+ struct ssi_protocol *ssi = hsi_client_drvdata(cl);
+
+ list_del(&ssi->link);
+ unregister_netdev(ssi->netdev);
+ ssip_free_cmds(ssi);
+ hsi_client_set_drvdata(cl, NULL);
+ kfree(ssi);
+
+ return 0;
+}
+
+static struct hsi_client_driver ssip_driver = {
+ .driver = {
+ .name = "ssi-protocol",
+ .owner = THIS_MODULE,
+ .probe = ssi_protocol_probe,
+ .remove = ssi_protocol_remove,
+ },
+};
+
+static int __init ssip_init(void)
+{
+ pr_info("SSI protocol aka McSAAB added\n");
+
+ return hsi_register_client_driver(&ssip_driver);
+}
+module_init(ssip_init);
+
+static void __exit ssip_exit(void)
+{
+ hsi_unregister_client_driver(&ssip_driver);
+ pr_info("SSI protocol driver removed\n");
+}
+module_exit(ssip_exit);
+
+MODULE_ALIAS("hsi:ssi-protocol");
+MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>");
+MODULE_AUTHOR("Remi Denis-Courmont <remi.denis-courmont@nokia.com>");
+MODULE_DESCRIPTION("SSI protocol improved aka McSAAB");
+MODULE_LICENSE("GPL");