@@ -143,4 +143,14 @@ config BCM_PDC_MBOX
Mailbox implementation for the Broadcom PDC ring manager,
which provides access to various offload engines on Broadcom
SoCs. Say Y here if you want to use the Broadcom PDC.
+
+config MTK_CMDQ_MBOX
+ bool "MediaTek CMDQ Mailbox Support"
+ depends on ARM64 && ( ARCH_MEDIATEK || COMPILE_TEST )
+ select MTK_INFRACFG
+ help
+ Say yes here to add support for the MediaTek Command Queue (CMDQ)
+ mailbox driver. The CMDQ is used to help read/write registers with
+ critical time limitation, such as updating display configuration
+ during the vblank.
endif
@@ -29,3 +29,5 @@ obj-$(CONFIG_XGENE_SLIMPRO_MBOX) += mailbox-xgene-slimpro.o
obj-$(CONFIG_HI6220_MBOX) += hi6220-mailbox.o
obj-$(CONFIG_BCM_PDC_MBOX) += bcm-pdc-mailbox.o
+
+obj-$(CONFIG_MTK_CMDQ_MBOX) += mtk-cmdq-mailbox.o
new file mode 100644
@@ -0,0 +1,632 @@
+/*
+ * Copyright (c) 2015 MediaTek Inc.
+ *
+ * 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.
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/dma-mapping.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/mailbox_controller.h>
+#include <linux/mailbox/mtk-cmdq-mailbox.h>
+#include <linux/timer.h>
+#include <linux/workqueue.h>
+
+#define CMDQ_THR_MAX_COUNT 3 /* main, sub, general(misc) */
+#define CMDQ_OP_CODE_MASK (0xff << CMDQ_OP_CODE_SHIFT)
+#define CMDQ_TIMEOUT_MS 1000
+#define CMDQ_IRQ_MASK 0xffff
+#define CMDQ_NUM_CMD(t) (t->cmd_buf_size / CMDQ_INST_SIZE)
+
+#define CMDQ_CURR_IRQ_STATUS 0x10
+#define CMDQ_THR_SLOT_CYCLES 0x30
+
+#define CMDQ_THR_BASE 0x100
+#define CMDQ_THR_SIZE 0x80
+#define CMDQ_THR_WARM_RESET 0x00
+#define CMDQ_THR_ENABLE_TASK 0x04
+#define CMDQ_THR_SUSPEND_TASK 0x08
+#define CMDQ_THR_CURR_STATUS 0x0c
+#define CMDQ_THR_IRQ_STATUS 0x10
+#define CMDQ_THR_IRQ_ENABLE 0x14
+#define CMDQ_THR_CURR_ADDR 0x20
+#define CMDQ_THR_END_ADDR 0x24
+#define CMDQ_THR_WAIT_TOKEN 0x30
+
+#define CMDQ_THR_ENABLED 0x1
+#define CMDQ_THR_DISABLED 0x0
+#define CMDQ_THR_SUSPEND 0x1
+#define CMDQ_THR_RESUME 0x0
+#define CMDQ_THR_STATUS_SUSPENDED BIT(1)
+#define CMDQ_THR_DO_WARM_RESET BIT(0)
+#define CMDQ_THR_ACTIVE_SLOT_CYCLES 0x3200
+#define CMDQ_THR_IRQ_DONE 0x1
+#define CMDQ_THR_IRQ_ERROR 0x12
+#define CMDQ_THR_IRQ_EN (CMDQ_THR_IRQ_ERROR | CMDQ_THR_IRQ_DONE)
+#define CMDQ_THR_IS_WAITING BIT(31)
+
+#define CMDQ_JUMP_BY_OFFSET 0x10000000
+#define CMDQ_JUMP_BY_PA 0x10000001
+
+struct cmdq_thread {
+ struct mbox_chan *chan;
+ void __iomem *base;
+ struct list_head task_busy_list;
+ struct timer_list timeout;
+ bool atomic_exec;
+};
+
+struct cmdq_task {
+ struct cmdq *cmdq;
+ struct list_head list_entry;
+ dma_addr_t pa_base;
+ struct cmdq_thread *thread;
+ struct cmdq_pkt *pkt; /* the packet sent from mailbox client */
+};
+
+struct cmdq_clk_release {
+ struct cmdq *cmdq;
+ struct work_struct release_work;
+};
+
+struct cmdq {
+ struct mbox_controller mbox;
+ void __iomem *base;
+ u32 irq;
+ struct workqueue_struct *clk_release_wq;
+ struct cmdq_thread thread[CMDQ_THR_MAX_COUNT];
+ struct clk *clock;
+ bool suspended;
+};
+
+static int cmdq_thread_suspend(struct cmdq *cmdq, struct cmdq_thread *thread)
+{
+ u32 status;
+
+ writel(CMDQ_THR_SUSPEND, thread->base + CMDQ_THR_SUSPEND_TASK);
+
+ /* If already disabled, treat as suspended successful. */
+ if (!(readl(thread->base + CMDQ_THR_ENABLE_TASK) & CMDQ_THR_ENABLED))
+ return 0;
+
+ if (readl_poll_timeout_atomic(thread->base + CMDQ_THR_CURR_STATUS,
+ status, status & CMDQ_THR_STATUS_SUSPENDED, 0, 10)) {
+ dev_err(cmdq->mbox.dev, "suspend GCE thread 0x%x failed\n",
+ (u32)(thread->base - cmdq->base));
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+static void cmdq_thread_resume(struct cmdq_thread *thread)
+{
+ writel(CMDQ_THR_RESUME, thread->base + CMDQ_THR_SUSPEND_TASK);
+}
+
+static int cmdq_thread_reset(struct cmdq *cmdq, struct cmdq_thread *thread)
+{
+ u32 warm_reset;
+
+ writel(CMDQ_THR_DO_WARM_RESET, thread->base + CMDQ_THR_WARM_RESET);
+ if (readl_poll_timeout_atomic(thread->base + CMDQ_THR_WARM_RESET,
+ warm_reset, !(warm_reset & CMDQ_THR_DO_WARM_RESET),
+ 0, 10)) {
+ dev_err(cmdq->mbox.dev, "reset GCE thread 0x%x failed\n",
+ (u32)(thread->base - cmdq->base));
+ return -EFAULT;
+ }
+ writel(CMDQ_THR_ACTIVE_SLOT_CYCLES, cmdq->base + CMDQ_THR_SLOT_CYCLES);
+ return 0;
+}
+
+static void cmdq_thread_disable(struct cmdq *cmdq, struct cmdq_thread *thread)
+{
+ cmdq_thread_reset(cmdq, thread);
+ writel(CMDQ_THR_DISABLED, thread->base + CMDQ_THR_ENABLE_TASK);
+}
+
+/* notify GCE to re-fetch commands by setting GCE thread PC */
+static void cmdq_thread_invalidate_fetched_data(struct cmdq_thread *thread)
+{
+ writel(readl(thread->base + CMDQ_THR_CURR_ADDR),
+ thread->base + CMDQ_THR_CURR_ADDR);
+}
+
+static void cmdq_task_insert_into_thread(struct cmdq_task *task)
+{
+ struct device *dev = task->cmdq->mbox.dev;
+ struct cmdq_thread *thread = task->thread;
+ struct cmdq_task *prev_task = list_last_entry(
+ &thread->task_busy_list, typeof(*task), list_entry);
+ u64 *prev_task_base = prev_task->pkt->va_base;
+
+ /* let previous task jump to this task */
+ dma_sync_single_for_cpu(dev, prev_task->pa_base,
+ prev_task->pkt->cmd_buf_size, DMA_TO_DEVICE);
+ prev_task_base[CMDQ_NUM_CMD(prev_task->pkt) - 1] =
+ (u64)CMDQ_JUMP_BY_PA << 32 | task->pa_base;
+ dma_sync_single_for_device(dev, prev_task->pa_base,
+ prev_task->pkt->cmd_buf_size, DMA_TO_DEVICE);
+
+ cmdq_thread_invalidate_fetched_data(thread);
+}
+
+static bool cmdq_command_is_wfe(u64 cmd)
+{
+ u64 wfe_option = CMDQ_WFE_UPDATE | CMDQ_WFE_WAIT | CMDQ_WFE_WAIT_VALUE;
+ u64 wfe_op = (u64)(CMDQ_CODE_WFE << CMDQ_OP_CODE_SHIFT) << 32;
+ u64 wfe_mask = (u64)CMDQ_OP_CODE_MASK << 32 | 0xffffffff;
+
+ return ((cmd & wfe_mask) == (wfe_op | wfe_option));
+}
+
+/* we assume tasks in the same display GCE thread are waiting the same event. */
+static void cmdq_task_remove_wfe(struct cmdq_task *task)
+{
+ struct device *dev = task->cmdq->mbox.dev;
+ u64 *base = task->pkt->va_base;
+ int i;
+
+ dma_sync_single_for_cpu(dev, task->pa_base, task->pkt->cmd_buf_size,
+ DMA_TO_DEVICE);
+ for (i = 0; i < CMDQ_NUM_CMD(task->pkt); i++)
+ if (cmdq_command_is_wfe(base[i]))
+ base[i] = (u64)CMDQ_JUMP_BY_OFFSET << 32 |
+ CMDQ_JUMP_PASS;
+ dma_sync_single_for_device(dev, task->pa_base, task->pkt->cmd_buf_size,
+ DMA_TO_DEVICE);
+}
+
+static bool cmdq_thread_is_in_wfe(struct cmdq_thread *thread)
+{
+ return readl(thread->base + CMDQ_THR_WAIT_TOKEN) & CMDQ_THR_IS_WAITING;
+}
+
+static void cmdq_thread_wait_end(struct cmdq_thread *thread,
+ unsigned long end_pa)
+{
+ struct device *dev = thread->chan->mbox->dev;
+ unsigned long curr_pa;
+
+ if (readl_poll_timeout_atomic(thread->base + CMDQ_THR_CURR_ADDR,
+ curr_pa, curr_pa == end_pa, 1, 20))
+ dev_err(dev, "GCE thread cannot run to end.\n");
+}
+
+static void cmdq_task_exec(struct cmdq_pkt *pkt, struct cmdq_thread *thread)
+{
+ struct cmdq *cmdq;
+ struct cmdq_task *task;
+ unsigned long curr_pa, end_pa, flags;
+
+ cmdq = dev_get_drvdata(thread->chan->mbox->dev);
+
+ /* Client should not flush new tasks if suspended. */
+ WARN_ON(cmdq->suspended);
+
+ task = kzalloc(sizeof(*task), GFP_ATOMIC);
+ task->cmdq = cmdq;
+ INIT_LIST_HEAD(&task->list_entry);
+ task->pa_base = dma_map_single(cmdq->mbox.dev, pkt->va_base,
+ pkt->cmd_buf_size, DMA_TO_DEVICE);
+ task->thread = thread;
+ task->pkt = pkt;
+
+ if (list_empty(&thread->task_busy_list)) {
+ /*
+ * Unlock for clk prepare (sleeping function).
+ * This is safe since clk_prepare_enable has internal locks.
+ */
+ spin_unlock_irqrestore(&thread->chan->lock, flags);
+ WARN_ON(clk_prepare_enable(cmdq->clock) < 0);
+ spin_lock_irqsave(&thread->chan->lock, flags);
+
+ WARN_ON(cmdq_thread_reset(cmdq, thread) < 0);
+
+ writel(task->pa_base, thread->base + CMDQ_THR_CURR_ADDR);
+ writel(task->pa_base + pkt->cmd_buf_size,
+ thread->base + CMDQ_THR_END_ADDR);
+ writel(CMDQ_THR_IRQ_EN, thread->base + CMDQ_THR_IRQ_ENABLE);
+ writel(CMDQ_THR_ENABLED, thread->base + CMDQ_THR_ENABLE_TASK);
+
+ mod_timer(&thread->timeout,
+ jiffies + msecs_to_jiffies(CMDQ_TIMEOUT_MS));
+ } else {
+ WARN_ON(cmdq_thread_suspend(cmdq, thread) < 0);
+ curr_pa = readl(thread->base + CMDQ_THR_CURR_ADDR);
+ end_pa = readl(thread->base + CMDQ_THR_END_ADDR);
+
+ /*
+ * Atomic execution should remove the following wfe, i.e. only
+ * wait event at first task, and prevent to pause when running.
+ */
+ if (thread->atomic_exec) {
+ /* GCE is executing if command is not WFE */
+ if (!cmdq_thread_is_in_wfe(thread)) {
+ cmdq_thread_resume(thread);
+ cmdq_thread_wait_end(thread, end_pa);
+ WARN_ON(cmdq_thread_suspend(cmdq, thread) < 0);
+ /* set to this task directly */
+ writel(task->pa_base,
+ thread->base + CMDQ_THR_CURR_ADDR);
+ } else {
+ cmdq_task_insert_into_thread(task);
+ cmdq_task_remove_wfe(task);
+ smp_mb(); /* modify jump before enable thread */
+ }
+ } else {
+ /* check boundary */
+ if (curr_pa == end_pa - CMDQ_INST_SIZE ||
+ curr_pa == end_pa) {
+ /* set to this task directly */
+ writel(task->pa_base,
+ thread->base + CMDQ_THR_CURR_ADDR);
+ } else {
+ cmdq_task_insert_into_thread(task);
+ smp_mb(); /* modify jump before enable thread */
+ }
+ }
+ writel(task->pa_base + pkt->cmd_buf_size,
+ thread->base + CMDQ_THR_END_ADDR);
+ cmdq_thread_resume(thread);
+ }
+ list_move_tail(&task->list_entry, &thread->task_busy_list);
+}
+
+static void cmdq_task_exec_done(struct cmdq_task *task, bool err)
+{
+ struct device *dev = task->cmdq->mbox.dev;
+ struct cmdq_cb_data cmdq_cb_data;
+
+ dma_unmap_single(dev, task->pa_base, task->pkt->cmd_buf_size,
+ DMA_TO_DEVICE);
+ if (task->pkt->cb.cb) {
+ cmdq_cb_data.err = err;
+ cmdq_cb_data.data = task->pkt->cb.data;
+ task->pkt->cb.cb(cmdq_cb_data);
+ }
+ list_del(&task->list_entry);
+}
+
+static void cmdq_task_handle_error(struct cmdq_task *task)
+{
+ struct cmdq_thread *thread = task->thread;
+ struct cmdq_task *next_task;
+
+ dev_err(task->cmdq->mbox.dev, "task 0x%p error\n", task);
+ WARN_ON(cmdq_thread_suspend(task->cmdq, thread) < 0);
+ next_task = list_first_entry_or_null(&thread->task_busy_list,
+ struct cmdq_task, list_entry);
+ if (next_task)
+ writel(next_task->pa_base, thread->base + CMDQ_THR_CURR_ADDR);
+ cmdq_thread_resume(thread);
+}
+
+static void cmdq_clk_release_work(struct work_struct *work_item)
+{
+ struct cmdq_clk_release *clk_release = container_of(work_item,
+ struct cmdq_clk_release, release_work);
+ struct cmdq *cmdq = clk_release->cmdq;
+
+ clk_disable_unprepare(cmdq->clock);
+ kfree(clk_release);
+}
+
+static void cmdq_clk_release_schedule(struct cmdq *cmdq)
+{
+ struct cmdq_clk_release *clk_release;
+
+ clk_release = kmalloc(sizeof(*clk_release), GFP_ATOMIC);
+ clk_release->cmdq = cmdq;
+ INIT_WORK(&clk_release->release_work, cmdq_clk_release_work);
+ queue_work(cmdq->clk_release_wq, &clk_release->release_work);
+}
+
+static void cmdq_thread_irq_handler(struct cmdq *cmdq,
+ struct cmdq_thread *thread)
+{
+ struct cmdq_task *task, *tmp, *curr_task = NULL;
+ u32 curr_pa, irq_flag, task_end_pa;
+ bool err;
+
+ irq_flag = readl(thread->base + CMDQ_THR_IRQ_STATUS);
+ writel(~irq_flag, thread->base + CMDQ_THR_IRQ_STATUS);
+
+ /*
+ * When ISR call this function, another CPU core could run
+ * "release task" right before we acquire the spin lock, and thus
+ * reset / disable this GCE thread, so we need to check the enable
+ * bit of this GCE thread.
+ */
+ if (!(readl(thread->base + CMDQ_THR_ENABLE_TASK) & CMDQ_THR_ENABLED))
+ return;
+
+ if (irq_flag & CMDQ_THR_IRQ_ERROR)
+ err = true;
+ else if (irq_flag & CMDQ_THR_IRQ_DONE)
+ err = false;
+ else
+ return;
+
+ curr_pa = readl(thread->base + CMDQ_THR_CURR_ADDR);
+
+ list_for_each_entry_safe(task, tmp, &thread->task_busy_list,
+ list_entry) {
+ task_end_pa = task->pa_base + task->pkt->cmd_buf_size;
+ if (curr_pa >= task->pa_base && curr_pa < task_end_pa)
+ curr_task = task;
+
+ if (!curr_task || curr_pa == task_end_pa - CMDQ_INST_SIZE) {
+ cmdq_task_exec_done(task, false);
+ kfree(task);
+ } else if (err) {
+ cmdq_task_exec_done(task, true);
+ cmdq_task_handle_error(curr_task);
+ kfree(task);
+ }
+
+ if (curr_task)
+ break;
+ }
+
+ if (list_empty(&thread->task_busy_list)) {
+ cmdq_thread_disable(cmdq, thread);
+ cmdq_clk_release_schedule(cmdq);
+ } else {
+ mod_timer(&thread->timeout,
+ jiffies + msecs_to_jiffies(CMDQ_TIMEOUT_MS));
+ }
+}
+
+static irqreturn_t cmdq_irq_handler(int irq, void *dev)
+{
+ struct cmdq *cmdq = dev;
+ unsigned long irq_status, flags = 0L;
+ int bit;
+
+ irq_status = readl(cmdq->base + CMDQ_CURR_IRQ_STATUS) & CMDQ_IRQ_MASK;
+ if (!(irq_status ^ CMDQ_IRQ_MASK))
+ return IRQ_NONE;
+
+ for_each_clear_bit(bit, &irq_status, fls(CMDQ_IRQ_MASK)) {
+ struct cmdq_thread *thread = &cmdq->thread[bit];
+
+ spin_lock_irqsave(&thread->chan->lock, flags);
+ cmdq_thread_irq_handler(cmdq, thread);
+ spin_unlock_irqrestore(&thread->chan->lock, flags);
+ }
+ return IRQ_HANDLED;
+}
+
+static void cmdq_thread_handle_timeout(unsigned long data)
+{
+ struct cmdq_thread *thread = (struct cmdq_thread *)data;
+ struct cmdq *cmdq = container_of(thread->chan->mbox, struct cmdq, mbox);
+ struct cmdq_task *task, *tmp;
+ unsigned long flags;
+
+ spin_lock_irqsave(&thread->chan->lock, flags);
+ WARN_ON(cmdq_thread_suspend(cmdq, thread) < 0);
+
+ /*
+ * Although IRQ is disabled, GCE continues to execute.
+ * It may have pending IRQ before GCE thread is suspended,
+ * so check this condition again.
+ */
+ cmdq_thread_irq_handler(cmdq, thread);
+
+ if (list_empty(&thread->task_busy_list)) {
+ cmdq_thread_resume(thread);
+ spin_unlock_irqrestore(&thread->chan->lock, flags);
+ return;
+ }
+
+ dev_err(cmdq->mbox.dev, "timeout\n");
+ list_for_each_entry_safe(task, tmp, &thread->task_busy_list,
+ list_entry) {
+ cmdq_task_exec_done(task, true);
+ kfree(task);
+ }
+
+ cmdq_thread_resume(thread);
+ cmdq_thread_disable(cmdq, thread);
+ cmdq_clk_release_schedule(cmdq);
+ spin_unlock_irqrestore(&thread->chan->lock, flags);
+}
+
+static int cmdq_suspend(struct device *dev)
+{
+ struct cmdq *cmdq = dev_get_drvdata(dev);
+ struct cmdq_thread *thread;
+ int i;
+ bool task_running = false;
+
+ cmdq->suspended = true;
+
+ for (i = 0; i < ARRAY_SIZE(cmdq->thread); i++) {
+ thread = &cmdq->thread[i];
+ if (!list_empty(&thread->task_busy_list)) {
+ task_running = true;
+ break;
+ }
+ }
+
+ if (task_running)
+ dev_warn(dev, "exist running task(s) in suspend\n");
+
+ flush_workqueue(cmdq->clk_release_wq);
+ return 0;
+}
+
+static int cmdq_resume(struct device *dev)
+{
+ struct cmdq *cmdq = dev_get_drvdata(dev);
+
+ cmdq->suspended = false;
+ return 0;
+}
+
+static int cmdq_remove(struct platform_device *pdev)
+{
+ struct cmdq *cmdq = platform_get_drvdata(pdev);
+
+ destroy_workqueue(cmdq->clk_release_wq);
+ mbox_controller_unregister(&cmdq->mbox);
+ return 0;
+}
+
+static int cmdq_mbox_send_data(struct mbox_chan *chan, void *data)
+{
+ cmdq_task_exec(data, chan->con_priv);
+ return 0;
+}
+
+static int cmdq_mbox_startup(struct mbox_chan *chan)
+{
+ return 0;
+}
+
+static void cmdq_mbox_shutdown(struct mbox_chan *chan)
+{
+}
+
+static bool cmdq_mbox_last_tx_done(struct mbox_chan *chan)
+{
+ return true;
+}
+
+static const struct mbox_chan_ops cmdq_mbox_chan_ops = {
+ .send_data = cmdq_mbox_send_data,
+ .startup = cmdq_mbox_startup,
+ .shutdown = cmdq_mbox_shutdown,
+ .last_tx_done = cmdq_mbox_last_tx_done,
+};
+
+static struct mbox_chan *cmdq_xlate(struct mbox_controller *mbox,
+ const struct of_phandle_args *sp)
+{
+ int ind = sp->args[0];
+ struct cmdq_thread *thread;
+
+ if (ind >= mbox->num_chans)
+ return ERR_PTR(-EINVAL);
+
+ thread = mbox->chans[ind].con_priv;
+ thread->atomic_exec = (sp->args[1] != 0);
+ thread->chan = &mbox->chans[ind];
+
+ return &mbox->chans[ind];
+}
+
+static int cmdq_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ struct cmdq *cmdq;
+ int err, i;
+
+ cmdq = devm_kzalloc(dev, sizeof(*cmdq), GFP_KERNEL);
+ if (!cmdq)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ cmdq->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(cmdq->base)) {
+ dev_err(dev, "failed to ioremap gce\n");
+ return PTR_ERR(cmdq->base);
+ }
+
+ cmdq->irq = platform_get_irq(pdev, 0);
+ if (!cmdq->irq) {
+ dev_err(dev, "failed to get irq\n");
+ return -EINVAL;
+ }
+ err = devm_request_irq(dev, cmdq->irq, cmdq_irq_handler, IRQF_SHARED,
+ "mtk_cmdq", cmdq);
+ if (err < 0) {
+ dev_err(dev, "failed to register ISR (%d)\n", err);
+ return err;
+ }
+
+ dev_dbg(dev, "cmdq device: addr:0x%p, va:0x%p, irq:%d\n",
+ dev, cmdq->base, cmdq->irq);
+
+ cmdq->clock = devm_clk_get(dev, "gce");
+ if (IS_ERR(cmdq->clock)) {
+ dev_err(dev, "failed to get gce clk\n");
+ return PTR_ERR(cmdq->clock);
+ }
+
+ cmdq->mbox.dev = dev;
+ cmdq->mbox.chans = devm_kcalloc(dev, CMDQ_THR_MAX_COUNT,
+ sizeof(*cmdq->mbox.chans), GFP_KERNEL);
+ if (!cmdq->mbox.chans)
+ return -ENOMEM;
+
+ cmdq->mbox.num_chans = CMDQ_THR_MAX_COUNT;
+ cmdq->mbox.ops = &cmdq_mbox_chan_ops;
+ cmdq->mbox.of_xlate = cmdq_xlate;
+
+ /* make use of TXDONE_BY_ACK */
+ cmdq->mbox.txdone_irq = false;
+ cmdq->mbox.txdone_poll = false;
+
+ for (i = 0; i < ARRAY_SIZE(cmdq->thread); i++) {
+ cmdq->thread[i].base = cmdq->base + CMDQ_THR_BASE +
+ CMDQ_THR_SIZE * i;
+ INIT_LIST_HEAD(&cmdq->thread[i].task_busy_list);
+ init_timer(&cmdq->thread[i].timeout);
+ cmdq->thread[i].timeout.function = cmdq_thread_handle_timeout;
+ cmdq->thread[i].timeout.data = (unsigned long)&cmdq->thread[i];
+ cmdq->mbox.chans[i].con_priv = &cmdq->thread[i];
+ }
+
+ err = mbox_controller_register(&cmdq->mbox);
+ if (err < 0) {
+ dev_err(dev, "failed to register mailbox: %d\n", err);
+ return err;
+ }
+
+ cmdq->clk_release_wq = alloc_ordered_workqueue(
+ "%s", WQ_MEM_RECLAIM | WQ_HIGHPRI,
+ "cmdq_clk_release");
+
+ platform_set_drvdata(pdev, cmdq);
+
+ return 0;
+}
+
+static const struct dev_pm_ops cmdq_pm_ops = {
+ .suspend = cmdq_suspend,
+ .resume = cmdq_resume,
+};
+
+static const struct of_device_id cmdq_of_ids[] = {
+ {.compatible = "mediatek,mt8173-gce",},
+ {}
+};
+
+static struct platform_driver cmdq_drv = {
+ .probe = cmdq_probe,
+ .remove = cmdq_remove,
+ .driver = {
+ .name = "mtk_cmdq",
+ .pm = &cmdq_pm_ops,
+ .of_match_table = cmdq_of_ids,
+ }
+};
+
+builtin_platform_driver(cmdq_drv);
new file mode 100644
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2015 MediaTek Inc.
+ *
+ * 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.
+ */
+
+#ifndef __MTK_CMDQ_MAILBOX_H__
+#define __MTK_CMDQ_MAILBOX_H__
+
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#define CMDQ_INST_SIZE 8 /* instruction is 64-bit */
+#define CMDQ_OP_CODE_SHIFT 24
+#define CMDQ_JUMP_PASS CMDQ_INST_SIZE
+
+#define CMDQ_WFE_UPDATE BIT(31)
+#define CMDQ_WFE_WAIT BIT(15)
+#define CMDQ_WFE_WAIT_VALUE 0x1
+
+/*
+ * CMDQ_CODE_MASK:
+ * set write mask
+ * format: op mask
+ * CMDQ_CODE_WRITE:
+ * write value into target register
+ * format: op subsys address value
+ * CMDQ_CODE_JUMP:
+ * jump by offset
+ * format: op offset
+ * CMDQ_CODE_WFE:
+ * wait for event and clear
+ * it is just clear if no wait
+ * format: [wait] op event update:1 to_wait:1 wait:1
+ * [clear] op event update:1 to_wait:0 wait:0
+ * CMDQ_CODE_EOC:
+ * end of command
+ * format: op irq_flag
+ */
+enum cmdq_code {
+ CMDQ_CODE_MASK = 0x02,
+ CMDQ_CODE_WRITE = 0x04,
+ CMDQ_CODE_JUMP = 0x10,
+ CMDQ_CODE_WFE = 0x20,
+ CMDQ_CODE_EOC = 0x40,
+};
+
+struct cmdq_cb_data {
+ bool err;
+ void *data;
+};
+
+typedef void (*cmdq_async_flush_cb)(struct cmdq_cb_data data);
+
+struct cmdq_task_cb {
+ cmdq_async_flush_cb cb;
+ void *data;
+};
+
+struct cmdq_pkt {
+ void *va_base;
+ size_t cmd_buf_size; /* command occupied size */
+ size_t buf_size; /* real buffer size */
+ struct cmdq_task_cb cb;
+};
+
+#endif /* __MTK_CMDQ_MAILBOX_H__ */