Re: [PATCH v6 3/4] mmc: mediatek: command queue support

From: Adrian Hunter
Date: Wed Jul 01 2020 - 09:41:54 EST

On 9/06/20 4:18 am, Chun-Hung Wu wrote:
> Support command queue for mt6779 platform.
> a. Add msdc_set_busy_timeout() to calculate emmc write timeout.
> b. Connect mtk msdc driver to cqhci driver through
> host->cq_host->ops = &msdc_cmdq_ops;
> c. msdc_cmdq_irq() will link up with cqchi_irq(). Besides, it provides
> more irq error messages like RSPCRCERR/CMDTO/DATACRCERR/DATTMO.
> d. Use the options below to separate support for CQHCI or not, because
> some of our platform does not support CQHCI hence no kernel option:
> CONFIG_MMC_CQHCI.
> #if IS_ENABLED(CONFIG_MMC_CQHCI)
> XXX //Support CQHCI
> #else
> XXX //Not support CQHCI
> #endif

Other drivers "select MMC_CQHCI" in Kconfig even though they support
hardware with or without CQHCI.

>
> Signed-off-by: Chun-Hung Wu <chun-hung.wu@xxxxxxxxxxxx>
> ---
> drivers/mmc/host/mtk-sd.c | 119 ++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 119 insertions(+)
>
> diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> index 84a7bd44..9d69269 100644
> --- a/drivers/mmc/host/mtk-sd.c
> +++ b/drivers/mmc/host/mtk-sd.c
> @@ -31,6 +31,8 @@
> #include <linux/mmc/sdio.h>
> #include <linux/mmc/slot-gpio.h>
>
> +#include "cqhci.h"
> +
> #define MAX_BD_NUM 1024
>
> /*--------------------------------------------------------------------------*/
> @@ -152,6 +154,7 @@
> #define MSDC_INT_DMA_BDCSERR (0x1 << 17) /* W1C */
> #define MSDC_INT_DMA_GPDCSERR (0x1 << 18) /* W1C */
> #define MSDC_INT_DMA_PROTECT (0x1 << 19) /* W1C */
> +#define MSDC_INT_CMDQ (0x1 << 28) /* W1C */
>
> /* MSDC_INTEN mask */
> #define MSDC_INTEN_MMCIRQ (0x1 << 0) /* RW */
> @@ -182,6 +185,7 @@
> /* SDC_CFG mask */
> #define SDC_CFG_SDIOINTWKUP (0x1 << 0) /* RW */
> #define SDC_CFG_INSWKUP (0x1 << 1) /* RW */
> +#define SDC_CFG_WRDTOC (0x1fff << 2) /* RW */
> #define SDC_CFG_BUSWIDTH (0x3 << 16) /* RW */
> #define SDC_CFG_SDIO (0x1 << 19) /* RW */
> #define SDC_CFG_SDIOIDE (0x1 << 20) /* RW */
> @@ -230,6 +234,7 @@
> #define MSDC_PATCH_BIT_DECRCTMO (0x1 << 30) /* RW */
>
> #define MSDC_PATCH_BIT1_CMDTA (0x7 << 3) /* RW */
> +#define MSDC_PB1_BUSY_CHECK_SEL (0x1 << 7) /* RW */
> #define MSDC_PATCH_BIT1_STOP_DLY (0xf << 8) /* RW */
>
> #define MSDC_PATCH_BIT2_CFGRESP (0x1 << 15) /* RW */
> @@ -431,9 +436,11 @@ struct msdc_host {
> /* cmd response sample selection for HS400 */
> bool hs400_mode; /* current eMMC will run at hs400 mode */
> bool internal_cd; /* Use internal card-detect logic */
> + bool cqhci; /* support eMMC hw cmdq */
> struct msdc_save_para save_para; /* used when gate HCLK */
> struct msdc_tune_para def_tune_para; /* default tune setting */
> struct msdc_tune_para saved_tune_para; /* tune result of CMD21/CMD19 */
> + struct cqhci_host *cq_host;
> };
>
> static const struct mtk_mmc_compatible mt8135_compat = {
> @@ -764,6 +771,15 @@ static void msdc_set_timeout(struct msdc_host *host, u64 ns, u64 clks)
> (u32)(timeout > 255 ? 255 : timeout));
> }
>
> +static void msdc_set_busy_timeout(struct msdc_host *host, u64 ns, u64 clks)
> +{
> + u64 timeout;
> +
> + timeout = msdc_timeout_cal(host, ns, clks);
> + sdr_set_field(host->base + SDC_CFG, SDC_CFG_WRDTOC,
> + (u32)(timeout > 8191 ? 8191 : timeout));
> +}
> +
> static void msdc_gate_clock(struct msdc_host *host)
> {
> clk_disable_unprepare(host->src_clk_cg);
> @@ -1480,6 +1496,36 @@ static void msdc_enable_sdio_irq(struct mmc_host *mmc, int enb)
> pm_runtime_put_noidle(host->dev);
> }
>
> +#if IS_ENABLED(CONFIG_MMC_CQHCI)
> +static irqreturn_t msdc_cmdq_irq(struct msdc_host *host, u32 intsts)
> +{
> + int cmd_err = 0, dat_err = 0;
> +
> + if (intsts & MSDC_INT_RSPCRCERR) {
> + cmd_err = -EILSEQ;
> + dev_err(host->dev, "%s: CMD CRC ERR", __func__);
> + } else if (intsts & MSDC_INT_CMDTMO) {
> + cmd_err = -ETIMEDOUT;
> + dev_err(host->dev, "%s: CMD TIMEOUT ERR", __func__);
> + }
> +
> + if (intsts & MSDC_INT_DATCRCERR) {
> + dat_err = -EILSEQ;
> + dev_err(host->dev, "%s: DATA CRC ERR", __func__);
> + } else if (intsts & MSDC_INT_DATTMO) {
> + dat_err = -ETIMEDOUT;
> + dev_err(host->dev, "%s: DATA TIMEOUT ERR", __func__);
> + }
> +
> + if (cmd_err || dat_err) {
> + dev_err(host->dev, "cmd_err = %d, dat_err =%d, intsts = 0x%x",
> + cmd_err, dat_err, intsts);
> + }
> +
> + return cqhci_irq(host->mmc, 0, cmd_err, dat_err);
> +}
> +#endif
> +
> static irqreturn_t msdc_irq(int irq, void *dev_id)
> {
> struct msdc_host *host = (struct msdc_host *) dev_id;
> @@ -1516,6 +1562,16 @@ static irqreturn_t msdc_irq(int irq, void *dev_id)
> if (!(events & (event_mask & ~MSDC_INT_SDIOIRQ)))
> break;
>
> +#if IS_ENABLED(CONFIG_MMC_CQHCI)
> + if ((host->mmc->caps2 & MMC_CAP2_CQE) &&
> + (events & MSDC_INT_CMDQ)) {
> + msdc_cmdq_irq(host, events);
> + /* clear interrupts */
> + writel(events, host->base + MSDC_INT);
> + return IRQ_HANDLED;
> + }
> +#endif
> +
> if (!mrq) {
> dev_err(host->dev,
> "%s: MRQ=NULL; events=%08X; event_mask=%08X\n",
> @@ -2200,6 +2256,36 @@ static int msdc_get_cd(struct mmc_host *mmc)
> return !val;
> }
>
> +static void msdc_cqe_enable(struct mmc_host *mmc)
> +{
> + struct msdc_host *host = mmc_priv(mmc);
> +
> + /* enable cmdq irq */
> + writel(MSDC_INT_CMDQ, host->base + MSDC_INTEN);
> + /* enable busy check */
> + sdr_set_bits(host->base + MSDC_PATCH_BIT1, MSDC_PB1_BUSY_CHECK_SEL);
> + /* default write data / busy timeout 20s */
> + msdc_set_busy_timeout(host, 20 * 1000000000ULL, 0);
> + /* default read data timeout 1s */
> + msdc_set_timeout(host, 1000000000ULL, 0);
> +}
> +
> +void msdc_cqe_disable(struct mmc_host *mmc, bool recovery)
> +{
> + struct msdc_host *host = mmc_priv(mmc);
> +
> + /* disable cmdq irq */
> + sdr_clr_bits(host->base + MSDC_INTEN, MSDC_INT_CMDQ);
> + /* disable busy check */
> + sdr_clr_bits(host->base + MSDC_PATCH_BIT1, MSDC_PB1_BUSY_CHECK_SEL);
> +
> + if (recovery) {
> + sdr_set_field(host->base + MSDC_DMA_CTRL,
> + MSDC_DMA_CTRL_STOP, 1);
> + msdc_reset_hw(host);
> + }
> +}
> +
> static const struct mmc_host_ops mt_msdc_ops = {
> .post_req = msdc_post_req,
> .pre_req = msdc_pre_req,
> @@ -2216,6 +2302,11 @@ static int msdc_get_cd(struct mmc_host *mmc)
> .hw_reset = msdc_hw_reset,
> };
>
> +static const struct cqhci_host_ops msdc_cmdq_ops = {
> + .enable = msdc_cqe_enable,
> + .disable = msdc_cqe_disable,
> +};
> +
> static void msdc_of_property_parse(struct platform_device *pdev,
> struct msdc_host *host)
> {
> @@ -2236,6 +2327,12 @@ static void msdc_of_property_parse(struct platform_device *pdev,
> host->hs400_cmd_resp_sel_rising = true;
> else
> host->hs400_cmd_resp_sel_rising = false;
> +
> + if (of_property_read_bool(pdev->dev.of_node,
> + "mediatek,cqhci"))
> + host->cqhci = true;
> + else
> + host->cqhci = false;
> }
>
> static int msdc_drv_probe(struct platform_device *pdev)
> @@ -2351,6 +2448,8 @@ static int msdc_drv_probe(struct platform_device *pdev)
> mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
>
> mmc->caps |= MMC_CAP_ERASE | MMC_CAP_CMD23;
> + if (host->cqhci)
> + mmc->caps2 |= MMC_CAP2_CQE | MMC_CAP2_CQE_DCMD;
> /* MMC core transfer sizes tunable parameters */
> mmc->max_segs = MAX_BD_NUM;
> if (host->dev_comp->support_64g)
> @@ -2366,6 +2465,26 @@ static int msdc_drv_probe(struct platform_device *pdev)
> host->dma_mask = DMA_BIT_MASK(32);
> mmc_dev(mmc)->dma_mask = &host->dma_mask;
>
> +#if IS_ENABLED(CONFIG_MMC_CQHCI)
> + if (mmc->caps2 & MMC_CAP2_CQE) {
> + host->cq_host = devm_kzalloc(host->mmc->parent,
> + sizeof(*host->cq_host),
> + GFP_KERNEL);
> + if (!host->cq_host) {
> + ret = -ENOMEM;
> + goto host_free;
> + }
> + host->cq_host->caps |= CQHCI_TASK_DESC_SZ_128;
> + host->cq_host->mmio = host->base + 0x800;
> + host->cq_host->ops = &msdc_cmdq_ops;
> + cqhci_init(host->cq_host, mmc, true);

cqhci_init() can return an error.

> + mmc->max_segs = 128;
> + /* cqhci 16bit length */
> + /* 0 size, means 65536 so we don't have to -1 here */
> + mmc->max_seg_size = 64 * 1024;
> + }
> +#endif
> +
> host->timeout_clks = 3 * 1048576;
> host->dma.gpd = dma_alloc_coherent(&pdev->dev,
> 2 * sizeof(struct mt_gpdma_desc),
>