[PATCH v3 3/3] mmc: sdhci-of-dwcmshc: add rockchip platform support
Adrian Hunter
adrian.hunter at intel.com
Wed Mar 10 13:19:34 GMT 2021
On 9/03/21 3:56 am, Shawn Lin wrote:
> sdhci based synopsys MMC IP is also used on some rockchip platforms,
> so add a basic support here.
>
> Signed-off-by: Shawn Lin <shawn.lin at rock-chips.com>
One minor comment below, otherwise, for sdhci:
Acked-by: Adrian Hunter <adrian.hunter at intel.com>
> ---
>
> Changes in v3: None
>
> drivers/mmc/host/sdhci-of-dwcmshc.c | 220 ++++++++++++++++++++++++++++++++++--
> 1 file changed, 213 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
> index 59d8d96..959084c 100644
> --- a/drivers/mmc/host/sdhci-of-dwcmshc.c
> +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
> @@ -9,9 +9,11 @@
>
> #include <linux/clk.h>
> #include <linux/dma-mapping.h>
> +#include <linux/iopoll.h>
> #include <linux/kernel.h>
> #include <linux/module.h>
> #include <linux/of.h>
> +#include <linux/of_device.h>
> #include <linux/sizes.h>
>
> #include "sdhci-pltfm.h"
> @@ -21,11 +23,43 @@
> /* DWCMSHC specific Mode Select value */
> #define DWCMSHC_CTRL_HS400 0x7
>
> +/* Rockchip specific Registers */
> +#define DWCMSHC_HOST_CTRL3 0x508
> +#define DWCMSHC_EMMC_CONTROL 0x52c
> +#define DWCMSHC_EMMC_ATCTRL 0x540
> +#define DWCMSHC_EMMC_DLL_CTRL 0x800
> +#define DWCMSHC_EMMC_DLL_RXCLK 0x804
> +#define DWCMSHC_EMMC_DLL_TXCLK 0x808
> +#define DWCMSHC_EMMC_DLL_STRBIN 0x80c
> +#define DWCMSHC_EMMC_DLL_STATUS0 0x840
> +#define DWCMSHC_EMMC_DLL_START BIT(0)
> +#define DWCMSHC_EMMC_DLL_RXCLK_SRCSEL 29
> +#define DWCMSHC_EMMC_DLL_START_POINT 16
> +#define DWCMSHC_EMMC_DLL_INC 8
> +#define DWCMSHC_EMMC_DLL_DLYENA BIT(27)
> +#define DLL_TXCLK_TAPNUM_DEFAULT 0x8
> +#define DLL_STRBIN_TAPNUM_DEFAULT 0x8
> +#define DLL_TXCLK_TAPNUM_FROM_SW BIT(24)
> +#define DLL_STRBIN_TAPNUM_FROM_SW BIT(24)
> +#define DWCMSHC_EMMC_DLL_LOCKED BIT(8)
> +#define DWCMSHC_EMMC_DLL_TIMEOUT BIT(9)
> +#define DLL_RXCLK_NO_INVERTER 1
> +#define DLL_RXCLK_INVERTER 0
> +#define DWCMSHC_ENHANCED_STROBE BIT(8)
> +#define DLL_LOCK_WO_TMOUT(x) \
> + ((((x) & DWCMSHC_EMMC_DLL_LOCKED) == DWCMSHC_EMMC_DLL_LOCKED) && \
> + (((x) & DWCMSHC_EMMC_DLL_TIMEOUT) == 0))
> +#define ROCKCHIP_MAX_CLKS 3
> +
> #define BOUNDARY_OK(addr, len) \
> ((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1)))
>
> struct dwcmshc_priv {
> struct clk *bus_clk;
> +
> + /* Rockchip specified optional clocks */
> + struct clk_bulk_data rockchip_clks[ROCKCHIP_MAX_CLKS];
> + int txclk_tapnum;
> };
>
> /*
> @@ -100,6 +134,97 @@ static void dwcmshc_set_uhs_signaling(struct sdhci_host *host,
> sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
> }
>
> +static void dwcmshc_rk_hs400_enhanced_strobe(struct mmc_host *mmc,
> + struct mmc_ios *ios)
> +{
> + u32 vendor;
> + struct sdhci_host *host = mmc_priv(mmc);
> +
> + vendor = sdhci_readl(host, DWCMSHC_EMMC_CONTROL);
> + if (ios->enhanced_strobe)
> + vendor |= DWCMSHC_ENHANCED_STROBE;
> + else
> + vendor &= ~DWCMSHC_ENHANCED_STROBE;
> +
> + sdhci_writel(host, vendor, DWCMSHC_EMMC_CONTROL);
> +}
> +
> +static void dwcmshc_rk_set_clock(struct sdhci_host *host, unsigned int clock)
> +{
> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> + u32 txclk_tapnum = DLL_TXCLK_TAPNUM_DEFAULT, extra;
> + int err;
> +
> + host->mmc->actual_clock = 0;
> +
> + /* DO NOT TOUCH THIS SETTING */
The comment could be more helpful if it explained why this setting
in particular should not be touched.
> + extra = DWCMSHC_EMMC_DLL_DLYENA |
> + DLL_RXCLK_NO_INVERTER << DWCMSHC_EMMC_DLL_RXCLK_SRCSEL;
> + sdhci_writel(host, extra, DWCMSHC_EMMC_DLL_RXCLK);
> +
> + if (clock == 0)
> + return;
> +
> + /* Rockchip platform only support 375KHz for identify mode */
> + if (clock <= 400000)
> + clock = 375000;
> +
> + err = clk_set_rate(pltfm_host->clk, clock);
> + if (err)
> + dev_err(mmc_dev(host->mmc), "fail to set clock %d", clock);
> +
> + sdhci_set_clock(host, clock);
> +
> + /* Disable cmd conflict check */
> + extra = sdhci_readl(host, DWCMSHC_HOST_CTRL3);
> + extra &= ~BIT(0);
> + sdhci_writel(host, extra, DWCMSHC_HOST_CTRL3);
> +
> + if (clock <= 400000) {
> + /* Disable DLL to reset sample clock */
> + sdhci_writel(host, 0, DWCMSHC_EMMC_DLL_CTRL);
> + return;
> + }
> +
> + /* Reset DLL */
> + sdhci_writel(host, BIT(1), DWCMSHC_EMMC_DLL_CTRL);
> + udelay(1);
> + sdhci_writel(host, 0x0, DWCMSHC_EMMC_DLL_CTRL);
> +
> + /* Init DLL settings */
> + extra = 0x5 << DWCMSHC_EMMC_DLL_START_POINT |
> + 0x2 << DWCMSHC_EMMC_DLL_INC |
> + DWCMSHC_EMMC_DLL_START;
> + sdhci_writel(host, extra, DWCMSHC_EMMC_DLL_CTRL);
> + err = readl_poll_timeout(host->ioaddr + DWCMSHC_EMMC_DLL_STATUS0,
> + extra, DLL_LOCK_WO_TMOUT(extra), 1,
> + 500 * USEC_PER_MSEC);
> + if (err) {
> + dev_err(mmc_dev(host->mmc), "DLL lock timeout!\n");
> + return;
> + }
> +
> + extra = 0x1 << 16 | /* tune clock stop en */
> + 0x2 << 17 | /* pre-change delay */
> + 0x3 << 19; /* post-change delay */
> + sdhci_writel(host, extra, DWCMSHC_EMMC_ATCTRL);
> +
> + if (host->mmc->ios.timing == MMC_TIMING_MMC_HS200 ||
> + host->mmc->ios.timing == MMC_TIMING_MMC_HS400)
> + txclk_tapnum = priv->txclk_tapnum;
> +
> + extra = DWCMSHC_EMMC_DLL_DLYENA |
> + DLL_TXCLK_TAPNUM_FROM_SW |
> + txclk_tapnum;
> + sdhci_writel(host, extra, DWCMSHC_EMMC_DLL_TXCLK);
> +
> + extra = DWCMSHC_EMMC_DLL_DLYENA |
> + DLL_STRBIN_TAPNUM_DEFAULT |
> + DLL_STRBIN_TAPNUM_FROM_SW;
> + sdhci_writel(host, extra, DWCMSHC_EMMC_DLL_STRBIN);
> +}
> +
> static const struct sdhci_ops sdhci_dwcmshc_ops = {
> .set_clock = sdhci_set_clock,
> .set_bus_width = sdhci_set_bus_width,
> @@ -109,21 +234,91 @@ static const struct sdhci_ops sdhci_dwcmshc_ops = {
> .adma_write_desc = dwcmshc_adma_write_desc,
> };
>
> +static const struct sdhci_ops sdhci_dwcmshc_rk_ops = {
> + .set_clock = dwcmshc_rk_set_clock,
> + .set_bus_width = sdhci_set_bus_width,
> + .set_uhs_signaling = dwcmshc_set_uhs_signaling,
> + .get_max_clock = sdhci_pltfm_clk_get_max_clock,
> + .reset = sdhci_reset,
> + .adma_write_desc = dwcmshc_adma_write_desc,
> +};
> +
> static const struct sdhci_pltfm_data sdhci_dwcmshc_pdata = {
> .ops = &sdhci_dwcmshc_ops,
> .quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
> .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
> };
>
> +static const struct sdhci_pltfm_data sdhci_dwcmshc_rk_pdata = {
> + .ops = &sdhci_dwcmshc_rk_ops,
> + .quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
> + SDHCI_QUIRK_BROKEN_TIMEOUT_VAL,
> + .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
> + SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
> +};
> +
> +static int rockchip_pltf_init(struct sdhci_host *host, struct dwcmshc_priv *priv)
> +{
> + int err;
> +
> + priv->rockchip_clks[0].id = "axi";
> + priv->rockchip_clks[1].id = "block";
> + priv->rockchip_clks[2].id = "timer";
> + err = devm_clk_bulk_get_optional(mmc_dev(host->mmc), ROCKCHIP_MAX_CLKS,
> + priv->rockchip_clks);
> + if (err) {
> + dev_err(mmc_dev(host->mmc), "failed to get clocks %d\n", err);
> + return err;
> + }
> +
> + err = clk_bulk_prepare_enable(ROCKCHIP_MAX_CLKS, priv->rockchip_clks);
> + if (err) {
> + dev_err(mmc_dev(host->mmc), "failed to enable clocks %d\n", err);
> + return err;
> + }
> +
> + if (of_property_read_u32(mmc_dev(host->mmc)->of_node, "rockchip,txclk-tapnum",
> + &priv->txclk_tapnum))
> + priv->txclk_tapnum = DLL_TXCLK_TAPNUM_DEFAULT;
> +
> + /* Disable cmd conflict check */
> + sdhci_writel(host, 0x0, DWCMSHC_HOST_CTRL3);
> + /* Reset previous settings */
> + sdhci_writel(host, 0, DWCMSHC_EMMC_DLL_TXCLK);
> + sdhci_writel(host, 0, DWCMSHC_EMMC_DLL_STRBIN);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id sdhci_dwcmshc_dt_ids[] = {
> + {
> + .compatible = "snps,dwcmshc-sdhci",
> + .data = &sdhci_dwcmshc_pdata,
> + },
> + {
> + .compatible = "rockchip,dwcmshc-sdhci",
> + .data = &sdhci_dwcmshc_rk_pdata,
> + },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, sdhci_dwcmshc_dt_ids);
> +
> static int dwcmshc_probe(struct platform_device *pdev)
> {
> struct sdhci_pltfm_host *pltfm_host;
> struct sdhci_host *host;
> struct dwcmshc_priv *priv;
> + const struct sdhci_pltfm_data *pltfm_data;
> int err;
> u32 extra;
>
> - host = sdhci_pltfm_init(pdev, &sdhci_dwcmshc_pdata,
> + pltfm_data = of_device_get_match_data(&pdev->dev);
> + if (!pltfm_data) {
> + dev_err(&pdev->dev, "Error: No device match data found\n");
> + return -ENODEV;
> + }
> +
> + host = sdhci_pltfm_init(pdev, pltfm_data,
> sizeof(struct dwcmshc_priv));
> if (IS_ERR(host))
> return PTR_ERR(host);
> @@ -161,6 +356,15 @@ static int dwcmshc_probe(struct platform_device *pdev)
>
> host->mmc_host_ops.request = dwcmshc_request;
>
> + if (pltfm_data == &sdhci_dwcmshc_rk_pdata) {
> + host->mmc_host_ops.hs400_enhanced_strobe =
> + dwcmshc_rk_hs400_enhanced_strobe;
> +
> + err = rockchip_pltf_init(host, priv);
> + if (err)
> + goto err_clk;
> + }
> +
> err = sdhci_add_host(host);
> if (err)
> goto err_clk;
> @@ -170,6 +374,7 @@ static int dwcmshc_probe(struct platform_device *pdev)
> err_clk:
> clk_disable_unprepare(pltfm_host->clk);
> clk_disable_unprepare(priv->bus_clk);
> + clk_bulk_disable_unprepare(ROCKCHIP_MAX_CLKS, priv->rockchip_clks);
> free_pltfm:
> sdhci_pltfm_free(pdev);
> return err;
> @@ -185,6 +390,7 @@ static int dwcmshc_remove(struct platform_device *pdev)
>
> clk_disable_unprepare(pltfm_host->clk);
> clk_disable_unprepare(priv->bus_clk);
> + clk_bulk_disable_unprepare(ROCKCHIP_MAX_CLKS, priv->rockchip_clks);
>
> sdhci_pltfm_free(pdev);
>
> @@ -207,6 +413,8 @@ static int dwcmshc_suspend(struct device *dev)
> if (!IS_ERR(priv->bus_clk))
> clk_disable_unprepare(priv->bus_clk);
>
> + clk_bulk_disable_unprepare(ROCKCHIP_MAX_CLKS, priv->rockchip_clks);
> +
> return ret;
> }
>
> @@ -227,18 +435,16 @@ static int dwcmshc_resume(struct device *dev)
> return ret;
> }
>
> + ret = clk_bulk_prepare_enable(ROCKCHIP_MAX_CLKS, priv->rockchip_clks);
> + if (ret)
> + return ret;
> +
> return sdhci_resume_host(host);
> }
> #endif
>
> static SIMPLE_DEV_PM_OPS(dwcmshc_pmops, dwcmshc_suspend, dwcmshc_resume);
>
> -static const struct of_device_id sdhci_dwcmshc_dt_ids[] = {
> - { .compatible = "snps,dwcmshc-sdhci" },
> - {}
> -};
> -MODULE_DEVICE_TABLE(of, sdhci_dwcmshc_dt_ids);
> -
> static struct platform_driver sdhci_dwcmshc_driver = {
> .driver = {
> .name = "sdhci-dwcmshc",
>
More information about the Linux-rockchip
mailing list