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SubjectRe: [PATCH v2 02/14] mailbox: cmdq: variablize address shift in platform
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Hi, Dennis:

On Wed, 2019-11-27 at 09:58 +0800, Dennis YC Hsieh wrote:
> Some gce hardware shift pc and end address in register to support
> large dram addressing.
> Implement gce address shift when write or read pc and end register.
> And add shift bit in platform definition.
>
> Signed-off-by: Dennis YC Hsieh <dennis-yc.hsieh@mediatek.com>
> ---
> drivers/mailbox/mtk-cmdq-mailbox.c | 57 ++++++++++++++++++------
> drivers/soc/mediatek/mtk-cmdq-helper.c | 3 +-
> include/linux/mailbox/mtk-cmdq-mailbox.h | 2 +
> 3 files changed, 48 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
> index 9a6ce9f5a7db..d5536563fce1 100644
> --- a/drivers/mailbox/mtk-cmdq-mailbox.c
> +++ b/drivers/mailbox/mtk-cmdq-mailbox.c
> @@ -76,8 +76,21 @@ struct cmdq {
> struct cmdq_thread *thread;
> struct clk *clock;
> bool suspended;
> + u8 shift_pa;
> };
>
> +struct gce_plat {
> + u32 thread_nr;
> + u8 shift;
> +};
> +
> +u8 cmdq_mbox_shift(struct mbox_chan *chan)
> +{
> + struct cmdq *cmdq = container_of(chan->mbox, struct cmdq, mbox);
> +
> + return cmdq->shift_pa;
> +}

EXPORT_SYMBOL(cmdq_mbox_shift);

> +
> static int cmdq_thread_suspend(struct cmdq *cmdq, struct cmdq_thread *thread)
> {
> u32 status;
> @@ -176,6 +189,7 @@ static void cmdq_task_remove_wfe(struct cmdq_task *task)
> {
> struct device *dev = task->cmdq->mbox.dev;
> u64 *base = task->pkt->va_base;
> + struct cmdq *cmdq = task->cmdq;
> int i;
>
> dma_sync_single_for_cpu(dev, task->pa_base, task->pkt->cmd_buf_size,
> @@ -183,7 +197,7 @@ static void cmdq_task_remove_wfe(struct cmdq_task *task)
> 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;
> + CMDQ_JUMP_PASS >> cmdq->shift_pa;

cmdq is only used here, so I would like

CMDQ_JUMP_PASS >> task->cmdq->shift_pa;

> dma_sync_single_for_device(dev, task->pa_base, task->pkt->cmd_buf_size,
> DMA_TO_DEVICE);
> }
> @@ -221,13 +235,15 @@ static void cmdq_task_handle_error(struct cmdq_task *task)
> {
> struct cmdq_thread *thread = task->thread;
> struct cmdq_task *next_task;
> + struct cmdq *cmdq = task->cmdq;
>
> 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);
> + writel(next_task->pa_base >> cmdq->shift_pa,
> + thread->base + CMDQ_THR_CURR_ADDR);
> cmdq_thread_resume(thread);
> }
>
> @@ -257,7 +273,7 @@ static void cmdq_thread_irq_handler(struct cmdq *cmdq,
> else
> return;
>
> - curr_pa = readl(thread->base + CMDQ_THR_CURR_ADDR);
> + curr_pa = readl(thread->base + CMDQ_THR_CURR_ADDR) << cmdq->shift_pa;
>
> list_for_each_entry_safe(task, tmp, &thread->task_busy_list,
> list_entry) {
> @@ -373,16 +389,20 @@ static int cmdq_mbox_send_data(struct mbox_chan *chan, void *data)
> WARN_ON(clk_enable(cmdq->clock) < 0);
> 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,
> + writel(task->pa_base >> cmdq->shift_pa,
> + thread->base + CMDQ_THR_CURR_ADDR);
> + writel((task->pa_base + pkt->cmd_buf_size) >> cmdq->shift_pa,
> thread->base + CMDQ_THR_END_ADDR);
> +
> writel(thread->priority, thread->base + CMDQ_THR_PRIORITY);
> writel(CMDQ_THR_IRQ_EN, thread->base + CMDQ_THR_IRQ_ENABLE);
> writel(CMDQ_THR_ENABLED, thread->base + CMDQ_THR_ENABLE_TASK);
> } 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);
> + curr_pa = readl(thread->base + CMDQ_THR_CURR_ADDR) <<
> + cmdq->shift_pa;
> + end_pa = readl(thread->base + CMDQ_THR_END_ADDR) <<
> + cmdq->shift_pa;
>
> /*
> * Atomic execution should remove the following wfe, i.e. only
> @@ -395,7 +415,7 @@ static int cmdq_mbox_send_data(struct mbox_chan *chan, void *data)
> cmdq_thread_wait_end(thread, end_pa);
> WARN_ON(cmdq_thread_suspend(cmdq, thread) < 0);
> /* set to this task directly */
> - writel(task->pa_base,
> + writel(task->pa_base >> cmdq->shift_pa,
> thread->base + CMDQ_THR_CURR_ADDR);
> } else {
> cmdq_task_insert_into_thread(task);
> @@ -407,14 +427,14 @@ static int cmdq_mbox_send_data(struct mbox_chan *chan, void *data)
> if (curr_pa == end_pa - CMDQ_INST_SIZE ||
> curr_pa == end_pa) {
> /* set to this task directly */
> - writel(task->pa_base,
> + writel(task->pa_base >> cmdq->shift_pa,
> 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,
> + writel((task->pa_base + pkt->cmd_buf_size) >> cmdq->shift_pa,
> thread->base + CMDQ_THR_END_ADDR);
> cmdq_thread_resume(thread);
> }
> @@ -461,6 +481,7 @@ static int cmdq_probe(struct platform_device *pdev)
> struct resource *res;
> struct cmdq *cmdq;
> int err, i;
> + struct gce_plat *plat_data;
>
> cmdq = devm_kzalloc(dev, sizeof(*cmdq), GFP_KERNEL);
> if (!cmdq)
> @@ -479,7 +500,14 @@ static int cmdq_probe(struct platform_device *pdev)
> return -EINVAL;
> }
>
> - cmdq->thread_nr = (u32)(unsigned long)of_device_get_match_data(dev);
> + plat_data = (struct gce_plat *)of_device_get_match_data(dev);
> + if (!plat_data) {
> + dev_err(dev, "failed to get match data\n");
> + return -EINVAL;
> + }
> +
> + cmdq->thread_nr = plat_data->thread_nr;
> + cmdq->shift_pa = plat_data->shift;
> cmdq->irq_mask = GENMASK(cmdq->thread_nr - 1, 0);
> err = devm_request_irq(dev, cmdq->irq, cmdq_irq_handler, IRQF_SHARED,
> "mtk_cmdq", cmdq);
> @@ -542,9 +570,12 @@ static const struct dev_pm_ops cmdq_pm_ops = {
> .resume = cmdq_resume,
> };
>
> +static const struct gce_plat gce_plat_v2 = {.thread_nr = 16, .shift = 0};
> +static const struct gce_plat gce_plat_v3 = {.thread_nr = 24, .shift = 0};

For global variable, you need not to initialize it to zero.

> +
> static const struct of_device_id cmdq_of_ids[] = {
> - {.compatible = "mediatek,mt8173-gce", .data = (void *)16},
> - {.compatible = "mediatek,mt8183-gce", .data = (void *)24},
> + {.compatible = "mediatek,mt8173-gce", .data = (void *)&gce_plat_v2},
> + {.compatible = "mediatek,mt8183-gce", .data = (void *)&gce_plat_v3},
> {}
> };
>
> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> index 9add0fd5fa6c..274f6f311d05 100644
> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> @@ -281,6 +281,7 @@ EXPORT_SYMBOL(cmdq_pkt_poll_mask);
>
> static int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
> {
> + struct cmdq_client *cl = pkt->cl;
> struct cmdq_instruction inst = { {0} };
> int err;
>
> @@ -293,7 +294,7 @@ static int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
>
> /* JUMP to end */
> inst.op = CMDQ_CODE_JUMP;
> - inst.value = CMDQ_JUMP_PASS;
> + inst.value = CMDQ_JUMP_PASS >> cmdq_mbox_shift(cl->chan);

cl is used only here, so I would like

cmdq_mbox_shift(pkt->cl->chan);

Regards,
CK

> err = cmdq_pkt_append_command(pkt, inst);
>
> return err;
> diff --git a/include/linux/mailbox/mtk-cmdq-mailbox.h b/include/linux/mailbox/mtk-cmdq-mailbox.h
> index a4dc45fbec0a..dfe5b2eb85cc 100644
> --- a/include/linux/mailbox/mtk-cmdq-mailbox.h
> +++ b/include/linux/mailbox/mtk-cmdq-mailbox.h
> @@ -88,4 +88,6 @@ struct cmdq_pkt {
> void *cl;
> };
>
> +u8 cmdq_mbox_shift(struct mbox_chan *chan);
> +
> #endif /* __MTK_CMDQ_MAILBOX_H__ */

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