Re: [PATCH v4] remoteproc/mediatek: Add support for mt8192 SCP

From: Mathieu Poirier
Date: Wed Oct 21 2020 - 15:35:26 EST

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Hi Shih,

On Wed, 14 Oct 2020 at 23:35, Pi-Hsun Shih <pihsun@xxxxxxxxxxxx> wrote:
>
> Add support for mt8192 SCP.
>

This is a very thin changelog. I wouldn't be surprised if you get asked to beef
it up.

> Signed-off-by: Pi-Hsun Shih <pihsun@xxxxxxxxxxxx>
> Reviewed-by: Tzung-Bi Shih <tzungbi@xxxxxxxxxx>
>
> ---
>
> Change since v3:
> * Remove unnecessary barrier and readl in mt8192_scp_before_load, which
> also fixes build failure on linux-next because of COMPILE_TEST trying
> to compile this on other platforms.
>
> Change since v2:
> * Inline scp_reset_assert / scp_reset_deassert.
>
> Change since v1:
> * Remove unused register definitions.
>
> ---
> drivers/remoteproc/mtk_common.h | 32 +++++
> drivers/remoteproc/mtk_scp.c | 200 +++++++++++++++++++++++++------
> drivers/remoteproc/mtk_scp_ipi.c | 6 +-
> 3 files changed, 200 insertions(+), 38 deletions(-)
>
> diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
> index 0066c83636d0..47b4561443a9 100644
> --- a/drivers/remoteproc/mtk_common.h
> +++ b/drivers/remoteproc/mtk_common.h
> @@ -32,6 +32,23 @@
> #define MT8183_SCP_CACHESIZE_8KB BIT(8)
> #define MT8183_SCP_CACHE_CON_WAYEN BIT(10)
>
> +#define MT8192_L2TCM_SRAM_PD_0 0x210C0
> +#define MT8192_L2TCM_SRAM_PD_1 0x210C4
> +#define MT8192_L2TCM_SRAM_PD_2 0x210C8
> +#define MT8192_L1TCM_SRAM_PDN 0x2102C
> +#define MT8192_CPU0_SRAM_PD 0x21080
> +
> +#define MT8192_SCP2APMCU_IPC_SET 0x24080
> +#define MT8192_SCP2APMCU_IPC_CLR 0x24084
> +#define MT8192_SCP_IPC_INT_BIT BIT(0)
> +#define MT8192_SCP2SPM_IPC_CLR 0x24094
> +#define MT8192_GIPC_IN_SET 0x24098
> +#define MT8192_HOST_IPC_INT_BIT BIT(0)
> +
> +#define MT8192_CORE0_SW_RSTN_CLR 0x30000
> +#define MT8192_CORE0_SW_RSTN_SET 0x30004
> +#define MT8192_CORE0_WDT_CFG 0x30034
> +
> #define SCP_FW_VER_LEN 32
> #define SCP_SHARE_BUFFER_SIZE 288
>
> @@ -50,6 +67,19 @@ struct scp_ipi_desc {
> void *priv;
> };
>
> +struct mtk_scp;
> +
> +struct mtk_scp_of_data {
> + int (*scp_before_load)(struct mtk_scp *scp);
> + void (*scp_irq_handler)(struct mtk_scp *scp);
> + void (*scp_reset_assert)(struct mtk_scp *scp);
> + void (*scp_reset_deassert)(struct mtk_scp *scp);
> + void (*scp_stop)(struct mtk_scp *scp);
> +
> + u32 host_to_scp_reg;
> + u32 host_to_scp_int_bit;
> +};
> +
> struct mtk_scp {
> struct device *dev;
> struct rproc *rproc;
> @@ -58,6 +88,8 @@ struct mtk_scp {
> void __iomem *sram_base;
> size_t sram_size;
>
> + const struct mtk_scp_of_data *data;
> +
> struct mtk_share_obj __iomem *recv_buf;
> struct mtk_share_obj __iomem *send_buf;
> struct scp_run run;
> diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
> index ac13e7b046a6..f8c54a0b33fc 100644
> --- a/drivers/remoteproc/mtk_scp.c
> +++ b/drivers/remoteproc/mtk_scp.c
> @@ -2,7 +2,6 @@
> //
> // Copyright (c) 2019 MediaTek Inc.
>
> -#include <asm/barrier.h>
> #include <linux/clk.h>
> #include <linux/dma-mapping.h>
> #include <linux/err.h>
> @@ -124,9 +123,6 @@ static int scp_ipi_init(struct mtk_scp *scp)
> size_t send_offset = SCP_FW_END - sizeof(struct mtk_share_obj);
> size_t recv_offset = send_offset - sizeof(struct mtk_share_obj);
>
> - /* Disable SCP to host interrupt */
> - writel(MT8183_SCP_IPC_INT_BIT, scp->reg_base + MT8183_SCP_TO_HOST);
> -

This needs to be in a patch on its own.

> /* shared buffer initialization */
> scp->recv_buf =
> (struct mtk_share_obj __iomem *)(scp->sram_base + recv_offset);
> @@ -138,7 +134,7 @@ static int scp_ipi_init(struct mtk_scp *scp)
> return 0;
> }
>
> -static void scp_reset_assert(const struct mtk_scp *scp)
> +static void mt8183_scp_reset_assert(struct mtk_scp *scp)

Rebranding of functions in preparation for mt8192 needs to be in a separate
patch (in the same patchset). When that is done you can add support for mt8192.

> {
> u32 val;
>
> @@ -147,7 +143,7 @@ static void scp_reset_assert(const struct mtk_scp *scp)
> writel(val, scp->reg_base + MT8183_SW_RSTN);
> }
>
> -static void scp_reset_deassert(const struct mtk_scp *scp)
> +static void mt8183_scp_reset_deassert(struct mtk_scp *scp)
> {
> u32 val;
>
> @@ -156,17 +152,19 @@ static void scp_reset_deassert(const struct mtk_scp *scp)
> writel(val, scp->reg_base + MT8183_SW_RSTN);
> }
>
> -static irqreturn_t scp_irq_handler(int irq, void *priv)
> +static void mt8192_scp_reset_assert(struct mtk_scp *scp)
> {
> - struct mtk_scp *scp = priv;
> - u32 scp_to_host;
> - int ret;
> + writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_SET);
> +}
>
> - ret = clk_prepare_enable(scp->clk);
> - if (ret) {
> - dev_err(scp->dev, "failed to enable clocks\n");
> - return IRQ_NONE;
> - }
> +static void mt8192_scp_reset_deassert(struct mtk_scp *scp)
> +{
> + writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_CLR);
> +}
> +
> +static void mt8183_scp_irq_handler(struct mtk_scp *scp)
> +{
> + u32 scp_to_host;
>
> scp_to_host = readl(scp->reg_base + MT8183_SCP_TO_HOST);
> if (scp_to_host & MT8183_SCP_IPC_INT_BIT)
> @@ -177,6 +175,40 @@ static irqreturn_t scp_irq_handler(int irq, void *priv)
> /* SCP won't send another interrupt until we set SCP_TO_HOST to 0. */
> writel(MT8183_SCP_IPC_INT_BIT | MT8183_SCP_WDT_INT_BIT,
> scp->reg_base + MT8183_SCP_TO_HOST);
> +}
> +
> +static void mt8192_scp_irq_handler(struct mtk_scp *scp)
> +{
> + u32 scp_to_host;
> +
> + scp_to_host = readl(scp->reg_base + MT8192_SCP2APMCU_IPC_SET);
> +
> + if (scp_to_host & MT8192_SCP_IPC_INT_BIT)
> + scp_ipi_handler(scp);
> + else
> + scp_wdt_handler(scp, scp_to_host);
> +
> + /*
> + * SCP won't send another interrupt until we clear
> + * MT8192_SCP2APMCU_IPC.
> + */
> + writel(MT8192_SCP_IPC_INT_BIT,
> + scp->reg_base + MT8192_SCP2APMCU_IPC_CLR);
> +}
> +
> +static irqreturn_t scp_irq_handler(int irq, void *priv)
> +{
> + struct mtk_scp *scp = priv;
> + int ret;
> +
> + ret = clk_prepare_enable(scp->clk);
> + if (ret) {
> + dev_err(scp->dev, "failed to enable clocks\n");
> + return IRQ_NONE;
> + }
> +
> + scp->data->scp_irq_handler(scp);
> +
> clk_disable_unprepare(scp->clk);
>
> return IRQ_HANDLED;
> @@ -238,20 +270,10 @@ static int scp_elf_load_segments(struct rproc *rproc, const struct firmware *fw)
> return ret;
> }
>
> -static int scp_load(struct rproc *rproc, const struct firmware *fw)
> +static int mt8183_scp_before_load(struct mtk_scp *scp)
> {
> - const struct mtk_scp *scp = rproc->priv;
> - struct device *dev = scp->dev;
> - int ret;
> -
> - ret = clk_prepare_enable(scp->clk);
> - if (ret) {
> - dev_err(dev, "failed to enable clocks\n");
> - return ret;
> - }
> -
> - /* Hold SCP in reset while loading FW. */
> - scp_reset_assert(scp);
> + /* Clear SCP to host interrupt */
> + writel(MT8183_SCP_IPC_INT_BIT, scp->reg_base + MT8183_SCP_TO_HOST);
>
> /* Reset clocks before loading FW */
> writel(0x0, scp->reg_base + MT8183_SCP_CLK_SW_SEL);
> @@ -272,6 +294,63 @@ static int scp_load(struct rproc *rproc, const struct firmware *fw)
> scp->reg_base + MT8183_SCP_CACHE_CON);
> writel(MT8183_SCP_CACHESIZE_8KB, scp->reg_base + MT8183_SCP_DCACHE_CON);
>
> + return 0;
> +}
> +
> +static void mt8192_power_on_sram(void *addr)
> +{
> + int i;
> +
> + for (i = 31; i >= 0; i--)
> + writel(GENMASK(i, 0), addr);
> + writel(0, addr);
> +}

How am I supposed to understand what is doing on here? Please add a comment
that clearly explains what is happening.

> +
> +static void mt8192_power_off_sram(void *addr)
> +{
> + int i;
> +
> + writel(0, addr);
> + for (i = 0; i < 32; i++)
> + writel(GENMASK(i, 0), addr);

Same here.

> +}
> +
> +static int mt8192_scp_before_load(struct mtk_scp *scp)
> +{
> + /* clear SPM interrupt, SCP2SPM_IPC_CLR */
> + writel(0xff, scp->reg_base + MT8192_SCP2SPM_IPC_CLR);
> +
> + writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_SET);
> +
> + /* enable SRAM clock */
> + mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_0);
> + mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_1);
> + mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_2);
> + mt8192_power_on_sram(scp->reg_base + MT8192_L1TCM_SRAM_PDN);
> + mt8192_power_on_sram(scp->reg_base + MT8192_CPU0_SRAM_PD);
> +
> + return 0;
> +}
> +
> +static int scp_load(struct rproc *rproc, const struct firmware *fw)
> +{
> + struct mtk_scp *scp = rproc->priv;
> + struct device *dev = scp->dev;
> + int ret;
> +
> + ret = clk_prepare_enable(scp->clk);
> + if (ret) {
> + dev_err(dev, "failed to enable clocks\n");
> + return ret;
> + }
> +
> + /* Hold SCP in reset while loading FW. */
> + scp->data->scp_reset_assert(scp);
> +
> + ret = scp->data->scp_before_load(scp);
> + if (ret < 0)
> + return ret;
> +

The core has gained support for prepare/unprepare() functions that do exactly
what is done above. Instead of using a custom operation to prepare firmware
loading please use the core's. That should lead to code that is easier to
maintain and in line with what is happening in other drivers. Please see
ingenic_proc.c for an example.

> ret = scp_elf_load_segments(rproc, fw);
> clk_disable_unprepare(scp->clk);
>
> @@ -293,7 +372,7 @@ static int scp_start(struct rproc *rproc)
>
> run->signaled = false;
>
> - scp_reset_deassert(scp);
> + scp->data->scp_reset_deassert(scp);
>
> ret = wait_event_interruptible_timeout(
> run->wq,
> @@ -309,13 +388,14 @@ static int scp_start(struct rproc *rproc)
> dev_err(dev, "wait SCP interrupted by a signal!\n");
> goto stop;
> }
> +

Unneeded modification.

> clk_disable_unprepare(scp->clk);
> dev_info(dev, "SCP is ready. FW version %s\n", run->fw_ver);
>
> return 0;
>
> stop:
> - scp_reset_assert(scp);
> + scp->data->scp_reset_assert(scp);
> clk_disable_unprepare(scp->clk);
> return ret;
> }
> @@ -329,7 +409,7 @@ static void *scp_da_to_va(struct rproc *rproc, u64 da, size_t len)
> offset = da;
> if (offset >= 0 && (offset + len) < scp->sram_size)
> return (void __force *)scp->sram_base + offset;
> - } else {
> + } else if (scp->dram_size) {
> offset = da - scp->dma_addr;
> if (offset >= 0 && (offset + len) < scp->dram_size)
> return (void __force *)scp->cpu_addr + offset;
> @@ -338,6 +418,25 @@ static void *scp_da_to_va(struct rproc *rproc, u64 da, size_t len)
> return NULL;
> }
>
> +static void mt8183_scp_stop(struct mtk_scp *scp)
> +{
> + /* Disable SCP watchdog */
> + writel(0, scp->reg_base + MT8183_WDT_CFG);
> +}
> +
> +static void mt8192_scp_stop(struct mtk_scp *scp)
> +{
> + /* Disable SRAM clock */
> + mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_0);
> + mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_1);
> + mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_2);
> + mt8192_power_off_sram(scp->reg_base + MT8192_L1TCM_SRAM_PDN);
> + mt8192_power_off_sram(scp->reg_base + MT8192_CPU0_SRAM_PD);
> +
> + /* Disable SCP watchdog */
> + writel(0, scp->reg_base + MT8192_CORE0_WDT_CFG);
> +}
> +
> static int scp_stop(struct rproc *rproc)
> {
> struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
> @@ -349,9 +448,8 @@ static int scp_stop(struct rproc *rproc)
> return ret;
> }
>
> - scp_reset_assert(scp);
> - /* Disable SCP watchdog */
> - writel(0, scp->reg_base + MT8183_WDT_CFG);
> + scp->data->scp_reset_assert(scp);
> + scp->data->scp_stop(scp);
> clk_disable_unprepare(scp->clk);
>
> return 0;
> @@ -443,6 +541,13 @@ static int scp_map_memory_region(struct mtk_scp *scp)
> int ret;
>
> ret = of_reserved_mem_device_init(scp->dev);
> +
> + /* reserved memory is optional. */
> + if (ret == -ENODEV) {
> + dev_info(scp->dev, "skipping reserved memory initialization.");
> + return 0;
> + }
> +

This needs to be on a patch on its own, together with the ->dram_size checks in
scp_da_to_va() and scp_unmap_memory_region().

Thanks,
Mathieu

> if (ret) {
> dev_err(scp->dev, "failed to assign memory-region: %d\n", ret);
> return -ENOMEM;
> @@ -460,6 +565,9 @@ static int scp_map_memory_region(struct mtk_scp *scp)
>
> static void scp_unmap_memory_region(struct mtk_scp *scp)
> {
> + if (scp->dram_size == 0)
> + return;
> +
> dma_free_coherent(scp->dev, scp->dram_size, scp->cpu_addr,
> scp->dma_addr);
> of_reserved_mem_device_release(scp->dev);
> @@ -536,6 +644,7 @@ static int scp_probe(struct platform_device *pdev)
> scp = (struct mtk_scp *)rproc->priv;
> scp->rproc = rproc;
> scp->dev = dev;
> + scp->data = of_device_get_match_data(dev);
> platform_set_drvdata(pdev, scp);
>
> res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram");
> @@ -642,8 +751,29 @@ static int scp_remove(struct platform_device *pdev)
> return 0;
> }
>
> +static const struct mtk_scp_of_data mt8183_of_data = {
> + .scp_before_load = mt8183_scp_before_load,
> + .scp_irq_handler = mt8183_scp_irq_handler,
> + .scp_reset_assert = mt8183_scp_reset_assert,
> + .scp_reset_deassert = mt8183_scp_reset_deassert,
> + .scp_stop = mt8183_scp_stop,
> + .host_to_scp_reg = MT8183_HOST_TO_SCP,
> + .host_to_scp_int_bit = MT8183_HOST_IPC_INT_BIT,
> +};
> +
> +static const struct mtk_scp_of_data mt8192_of_data = {
> + .scp_before_load = mt8192_scp_before_load,
> + .scp_irq_handler = mt8192_scp_irq_handler,
> + .scp_reset_assert = mt8192_scp_reset_assert,
> + .scp_reset_deassert = mt8192_scp_reset_deassert,
> + .scp_stop = mt8192_scp_stop,
> + .host_to_scp_reg = MT8192_GIPC_IN_SET,
> + .host_to_scp_int_bit = MT8192_HOST_IPC_INT_BIT,
> +};
> +
> static const struct of_device_id mtk_scp_of_match[] = {
> - { .compatible = "mediatek,mt8183-scp"},
> + { .compatible = "mediatek,mt8183-scp", .data = &mt8183_of_data },
> + { .compatible = "mediatek,mt8192-scp", .data = &mt8192_of_data },
> {},
> };
> MODULE_DEVICE_TABLE(of, mtk_scp_of_match);
> diff --git a/drivers/remoteproc/mtk_scp_ipi.c b/drivers/remoteproc/mtk_scp_ipi.c
> index 3d3d87210ef2..f645d8bc9f7c 100644
> --- a/drivers/remoteproc/mtk_scp_ipi.c
> +++ b/drivers/remoteproc/mtk_scp_ipi.c
> @@ -2,7 +2,6 @@
> //
> // Copyright (c) 2019 MediaTek Inc.
>
> -#include <asm/barrier.h>
> #include <linux/clk.h>
> #include <linux/err.h>
> #include <linux/io.h>
> @@ -182,7 +181,7 @@ int scp_ipi_send(struct mtk_scp *scp, u32 id, void *buf, unsigned int len,
> ret = -ETIMEDOUT;
> goto clock_disable;
> }
> - } while (readl(scp->reg_base + MT8183_HOST_TO_SCP));
> + } while (readl(scp->reg_base + scp->data->host_to_scp_reg));
>
> scp_memcpy_aligned(send_obj->share_buf, buf, len);
>
> @@ -191,7 +190,8 @@ int scp_ipi_send(struct mtk_scp *scp, u32 id, void *buf, unsigned int len,
>
> scp->ipi_id_ack[id] = false;
> /* send the command to SCP */
> - writel(MT8183_HOST_IPC_INT_BIT, scp->reg_base + MT8183_HOST_TO_SCP);
> + writel(scp->data->host_to_scp_int_bit,
> + scp->reg_base + scp->data->host_to_scp_reg);
>
> if (wait) {
> /* wait for SCP's ACK */
>
> base-commit: 3e4fb4346c781068610d03c12b16c0cfb0fd24a3
> --
> 2.28.0.1011.ga647a8990f-goog
>

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