v4.19.13 snapshot.
diff --git a/drivers/mailbox/tegra-hsp.c b/drivers/mailbox/tegra-hsp.c
new file mode 100644
index 0000000..0cde356
--- /dev/null
+++ b/drivers/mailbox/tegra-hsp.c
@@ -0,0 +1,479 @@
+/*
+ * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/mailbox_controller.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <dt-bindings/mailbox/tegra186-hsp.h>
+
+#define HSP_INT_DIMENSIONING 0x380
+#define HSP_nSM_SHIFT 0
+#define HSP_nSS_SHIFT 4
+#define HSP_nAS_SHIFT 8
+#define HSP_nDB_SHIFT 12
+#define HSP_nSI_SHIFT 16
+#define HSP_nINT_MASK 0xf
+
+#define HSP_DB_TRIGGER 0x0
+#define HSP_DB_ENABLE 0x4
+#define HSP_DB_RAW 0x8
+#define HSP_DB_PENDING 0xc
+
+#define HSP_DB_CCPLEX 1
+#define HSP_DB_BPMP 3
+#define HSP_DB_MAX 7
+
+struct tegra_hsp_channel;
+struct tegra_hsp;
+
+struct tegra_hsp_channel {
+ struct tegra_hsp *hsp;
+ struct mbox_chan *chan;
+ void __iomem *regs;
+};
+
+struct tegra_hsp_doorbell {
+ struct tegra_hsp_channel channel;
+ struct list_head list;
+ const char *name;
+ unsigned int master;
+ unsigned int index;
+};
+
+struct tegra_hsp_db_map {
+ const char *name;
+ unsigned int master;
+ unsigned int index;
+};
+
+struct tegra_hsp_soc {
+ const struct tegra_hsp_db_map *map;
+};
+
+struct tegra_hsp {
+ const struct tegra_hsp_soc *soc;
+ struct mbox_controller mbox;
+ void __iomem *regs;
+ unsigned int irq;
+ unsigned int num_sm;
+ unsigned int num_as;
+ unsigned int num_ss;
+ unsigned int num_db;
+ unsigned int num_si;
+ spinlock_t lock;
+
+ struct list_head doorbells;
+};
+
+static inline struct tegra_hsp *
+to_tegra_hsp(struct mbox_controller *mbox)
+{
+ return container_of(mbox, struct tegra_hsp, mbox);
+}
+
+static inline u32 tegra_hsp_readl(struct tegra_hsp *hsp, unsigned int offset)
+{
+ return readl(hsp->regs + offset);
+}
+
+static inline void tegra_hsp_writel(struct tegra_hsp *hsp, u32 value,
+ unsigned int offset)
+{
+ writel(value, hsp->regs + offset);
+}
+
+static inline u32 tegra_hsp_channel_readl(struct tegra_hsp_channel *channel,
+ unsigned int offset)
+{
+ return readl(channel->regs + offset);
+}
+
+static inline void tegra_hsp_channel_writel(struct tegra_hsp_channel *channel,
+ u32 value, unsigned int offset)
+{
+ writel(value, channel->regs + offset);
+}
+
+static bool tegra_hsp_doorbell_can_ring(struct tegra_hsp_doorbell *db)
+{
+ u32 value;
+
+ value = tegra_hsp_channel_readl(&db->channel, HSP_DB_ENABLE);
+
+ return (value & BIT(TEGRA_HSP_DB_MASTER_CCPLEX)) != 0;
+}
+
+static struct tegra_hsp_doorbell *
+__tegra_hsp_doorbell_get(struct tegra_hsp *hsp, unsigned int master)
+{
+ struct tegra_hsp_doorbell *entry;
+
+ list_for_each_entry(entry, &hsp->doorbells, list)
+ if (entry->master == master)
+ return entry;
+
+ return NULL;
+}
+
+static struct tegra_hsp_doorbell *
+tegra_hsp_doorbell_get(struct tegra_hsp *hsp, unsigned int master)
+{
+ struct tegra_hsp_doorbell *db;
+ unsigned long flags;
+
+ spin_lock_irqsave(&hsp->lock, flags);
+ db = __tegra_hsp_doorbell_get(hsp, master);
+ spin_unlock_irqrestore(&hsp->lock, flags);
+
+ return db;
+}
+
+static irqreturn_t tegra_hsp_doorbell_irq(int irq, void *data)
+{
+ struct tegra_hsp *hsp = data;
+ struct tegra_hsp_doorbell *db;
+ unsigned long master, value;
+
+ db = tegra_hsp_doorbell_get(hsp, TEGRA_HSP_DB_MASTER_CCPLEX);
+ if (!db)
+ return IRQ_NONE;
+
+ value = tegra_hsp_channel_readl(&db->channel, HSP_DB_PENDING);
+ tegra_hsp_channel_writel(&db->channel, value, HSP_DB_PENDING);
+
+ spin_lock(&hsp->lock);
+
+ for_each_set_bit(master, &value, hsp->mbox.num_chans) {
+ struct tegra_hsp_doorbell *db;
+
+ db = __tegra_hsp_doorbell_get(hsp, master);
+ /*
+ * Depending on the bootloader chain, the CCPLEX doorbell will
+ * have some doorbells enabled, which means that requesting an
+ * interrupt will immediately fire.
+ *
+ * In that case, db->channel.chan will still be NULL here and
+ * cause a crash if not properly guarded.
+ *
+ * It remains to be seen if ignoring the doorbell in that case
+ * is the correct solution.
+ */
+ if (db && db->channel.chan)
+ mbox_chan_received_data(db->channel.chan, NULL);
+ }
+
+ spin_unlock(&hsp->lock);
+
+ return IRQ_HANDLED;
+}
+
+static struct tegra_hsp_channel *
+tegra_hsp_doorbell_create(struct tegra_hsp *hsp, const char *name,
+ unsigned int master, unsigned int index)
+{
+ struct tegra_hsp_doorbell *db;
+ unsigned int offset;
+ unsigned long flags;
+
+ db = kzalloc(sizeof(*db), GFP_KERNEL);
+ if (!db)
+ return ERR_PTR(-ENOMEM);
+
+ offset = (1 + (hsp->num_sm / 2) + hsp->num_ss + hsp->num_as) << 16;
+ offset += index * 0x100;
+
+ db->channel.regs = hsp->regs + offset;
+ db->channel.hsp = hsp;
+
+ db->name = kstrdup_const(name, GFP_KERNEL);
+ db->master = master;
+ db->index = index;
+
+ spin_lock_irqsave(&hsp->lock, flags);
+ list_add_tail(&db->list, &hsp->doorbells);
+ spin_unlock_irqrestore(&hsp->lock, flags);
+
+ return &db->channel;
+}
+
+static void __tegra_hsp_doorbell_destroy(struct tegra_hsp_doorbell *db)
+{
+ list_del(&db->list);
+ kfree_const(db->name);
+ kfree(db);
+}
+
+static int tegra_hsp_doorbell_send_data(struct mbox_chan *chan, void *data)
+{
+ struct tegra_hsp_doorbell *db = chan->con_priv;
+
+ tegra_hsp_channel_writel(&db->channel, 1, HSP_DB_TRIGGER);
+
+ return 0;
+}
+
+static int tegra_hsp_doorbell_startup(struct mbox_chan *chan)
+{
+ struct tegra_hsp_doorbell *db = chan->con_priv;
+ struct tegra_hsp *hsp = db->channel.hsp;
+ struct tegra_hsp_doorbell *ccplex;
+ unsigned long flags;
+ u32 value;
+
+ if (db->master >= hsp->mbox.num_chans) {
+ dev_err(hsp->mbox.dev,
+ "invalid master ID %u for HSP channel\n",
+ db->master);
+ return -EINVAL;
+ }
+
+ ccplex = tegra_hsp_doorbell_get(hsp, TEGRA_HSP_DB_MASTER_CCPLEX);
+ if (!ccplex)
+ return -ENODEV;
+
+ if (!tegra_hsp_doorbell_can_ring(db))
+ return -ENODEV;
+
+ spin_lock_irqsave(&hsp->lock, flags);
+
+ value = tegra_hsp_channel_readl(&ccplex->channel, HSP_DB_ENABLE);
+ value |= BIT(db->master);
+ tegra_hsp_channel_writel(&ccplex->channel, value, HSP_DB_ENABLE);
+
+ spin_unlock_irqrestore(&hsp->lock, flags);
+
+ return 0;
+}
+
+static void tegra_hsp_doorbell_shutdown(struct mbox_chan *chan)
+{
+ struct tegra_hsp_doorbell *db = chan->con_priv;
+ struct tegra_hsp *hsp = db->channel.hsp;
+ struct tegra_hsp_doorbell *ccplex;
+ unsigned long flags;
+ u32 value;
+
+ ccplex = tegra_hsp_doorbell_get(hsp, TEGRA_HSP_DB_MASTER_CCPLEX);
+ if (!ccplex)
+ return;
+
+ spin_lock_irqsave(&hsp->lock, flags);
+
+ value = tegra_hsp_channel_readl(&ccplex->channel, HSP_DB_ENABLE);
+ value &= ~BIT(db->master);
+ tegra_hsp_channel_writel(&ccplex->channel, value, HSP_DB_ENABLE);
+
+ spin_unlock_irqrestore(&hsp->lock, flags);
+}
+
+static const struct mbox_chan_ops tegra_hsp_doorbell_ops = {
+ .send_data = tegra_hsp_doorbell_send_data,
+ .startup = tegra_hsp_doorbell_startup,
+ .shutdown = tegra_hsp_doorbell_shutdown,
+};
+
+static struct mbox_chan *of_tegra_hsp_xlate(struct mbox_controller *mbox,
+ const struct of_phandle_args *args)
+{
+ struct tegra_hsp_channel *channel = ERR_PTR(-ENODEV);
+ struct tegra_hsp *hsp = to_tegra_hsp(mbox);
+ unsigned int type = args->args[0];
+ unsigned int master = args->args[1];
+ struct tegra_hsp_doorbell *db;
+ struct mbox_chan *chan;
+ unsigned long flags;
+ unsigned int i;
+
+ switch (type) {
+ case TEGRA_HSP_MBOX_TYPE_DB:
+ db = tegra_hsp_doorbell_get(hsp, master);
+ if (db)
+ channel = &db->channel;
+
+ break;
+
+ default:
+ break;
+ }
+
+ if (IS_ERR(channel))
+ return ERR_CAST(channel);
+
+ spin_lock_irqsave(&hsp->lock, flags);
+
+ for (i = 0; i < hsp->mbox.num_chans; i++) {
+ chan = &hsp->mbox.chans[i];
+ if (!chan->con_priv) {
+ chan->con_priv = channel;
+ channel->chan = chan;
+ break;
+ }
+
+ chan = NULL;
+ }
+
+ spin_unlock_irqrestore(&hsp->lock, flags);
+
+ return chan ?: ERR_PTR(-EBUSY);
+}
+
+static void tegra_hsp_remove_doorbells(struct tegra_hsp *hsp)
+{
+ struct tegra_hsp_doorbell *db, *tmp;
+ unsigned long flags;
+
+ spin_lock_irqsave(&hsp->lock, flags);
+
+ list_for_each_entry_safe(db, tmp, &hsp->doorbells, list)
+ __tegra_hsp_doorbell_destroy(db);
+
+ spin_unlock_irqrestore(&hsp->lock, flags);
+}
+
+static int tegra_hsp_add_doorbells(struct tegra_hsp *hsp)
+{
+ const struct tegra_hsp_db_map *map = hsp->soc->map;
+ struct tegra_hsp_channel *channel;
+
+ while (map->name) {
+ channel = tegra_hsp_doorbell_create(hsp, map->name,
+ map->master, map->index);
+ if (IS_ERR(channel)) {
+ tegra_hsp_remove_doorbells(hsp);
+ return PTR_ERR(channel);
+ }
+
+ map++;
+ }
+
+ return 0;
+}
+
+static int tegra_hsp_probe(struct platform_device *pdev)
+{
+ struct tegra_hsp *hsp;
+ struct resource *res;
+ u32 value;
+ int err;
+
+ hsp = devm_kzalloc(&pdev->dev, sizeof(*hsp), GFP_KERNEL);
+ if (!hsp)
+ return -ENOMEM;
+
+ hsp->soc = of_device_get_match_data(&pdev->dev);
+ INIT_LIST_HEAD(&hsp->doorbells);
+ spin_lock_init(&hsp->lock);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ hsp->regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(hsp->regs))
+ return PTR_ERR(hsp->regs);
+
+ value = tegra_hsp_readl(hsp, HSP_INT_DIMENSIONING);
+ hsp->num_sm = (value >> HSP_nSM_SHIFT) & HSP_nINT_MASK;
+ hsp->num_ss = (value >> HSP_nSS_SHIFT) & HSP_nINT_MASK;
+ hsp->num_as = (value >> HSP_nAS_SHIFT) & HSP_nINT_MASK;
+ hsp->num_db = (value >> HSP_nDB_SHIFT) & HSP_nINT_MASK;
+ hsp->num_si = (value >> HSP_nSI_SHIFT) & HSP_nINT_MASK;
+
+ err = platform_get_irq_byname(pdev, "doorbell");
+ if (err < 0) {
+ dev_err(&pdev->dev, "failed to get doorbell IRQ: %d\n", err);
+ return err;
+ }
+
+ hsp->irq = err;
+
+ hsp->mbox.of_xlate = of_tegra_hsp_xlate;
+ hsp->mbox.num_chans = 32;
+ hsp->mbox.dev = &pdev->dev;
+ hsp->mbox.txdone_irq = false;
+ hsp->mbox.txdone_poll = false;
+ hsp->mbox.ops = &tegra_hsp_doorbell_ops;
+
+ hsp->mbox.chans = devm_kcalloc(&pdev->dev, hsp->mbox.num_chans,
+ sizeof(*hsp->mbox.chans),
+ GFP_KERNEL);
+ if (!hsp->mbox.chans)
+ return -ENOMEM;
+
+ err = tegra_hsp_add_doorbells(hsp);
+ if (err < 0) {
+ dev_err(&pdev->dev, "failed to add doorbells: %d\n", err);
+ return err;
+ }
+
+ platform_set_drvdata(pdev, hsp);
+
+ err = mbox_controller_register(&hsp->mbox);
+ if (err) {
+ dev_err(&pdev->dev, "failed to register mailbox: %d\n", err);
+ tegra_hsp_remove_doorbells(hsp);
+ return err;
+ }
+
+ err = devm_request_irq(&pdev->dev, hsp->irq, tegra_hsp_doorbell_irq,
+ IRQF_NO_SUSPEND, dev_name(&pdev->dev), hsp);
+ if (err < 0) {
+ dev_err(&pdev->dev, "failed to request IRQ#%u: %d\n",
+ hsp->irq, err);
+ return err;
+ }
+
+ return 0;
+}
+
+static int tegra_hsp_remove(struct platform_device *pdev)
+{
+ struct tegra_hsp *hsp = platform_get_drvdata(pdev);
+
+ mbox_controller_unregister(&hsp->mbox);
+ tegra_hsp_remove_doorbells(hsp);
+
+ return 0;
+}
+
+static const struct tegra_hsp_db_map tegra186_hsp_db_map[] = {
+ { "ccplex", TEGRA_HSP_DB_MASTER_CCPLEX, HSP_DB_CCPLEX, },
+ { "bpmp", TEGRA_HSP_DB_MASTER_BPMP, HSP_DB_BPMP, },
+ { /* sentinel */ }
+};
+
+static const struct tegra_hsp_soc tegra186_hsp_soc = {
+ .map = tegra186_hsp_db_map,
+};
+
+static const struct of_device_id tegra_hsp_match[] = {
+ { .compatible = "nvidia,tegra186-hsp", .data = &tegra186_hsp_soc },
+ { }
+};
+
+static struct platform_driver tegra_hsp_driver = {
+ .driver = {
+ .name = "tegra-hsp",
+ .of_match_table = tegra_hsp_match,
+ },
+ .probe = tegra_hsp_probe,
+ .remove = tegra_hsp_remove,
+};
+
+static int __init tegra_hsp_init(void)
+{
+ return platform_driver_register(&tegra_hsp_driver);
+}
+core_initcall(tegra_hsp_init);