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SubjectRe: [PATCH V1 3/3] mmc: host: Register changes for sdcc V5
Hi Vijay. Thanks for this patch.

On Thu, May 17, 2018 at 3:30 AM Vijay Viswanath <vviswana@codeaurora.org>
wrote:

> From: Sayali Lokhande <sayalil@codeaurora.org>

> For SDCC version 5.0.0 and higher, new compatible string
> "qcom,sdhci-msm-v5" is added.

> Based on the msm variant, pick the relevant variant data and
> use it for register read/write to msm specific registers.

> Signed-off-by: Sayali Lokhande <sayalil@codeaurora.org>
> Signed-off-by: Vijay Viswanath <vviswana@codeaurora.org>
> ---
> .../devicetree/bindings/mmc/sdhci-msm.txt | 5 +-
> drivers/mmc/host/sdhci-msm.c | 344
+++++++++++++--------
> 2 files changed, 222 insertions(+), 127 deletions(-)

> diff --git a/Documentation/devicetree/bindings/mmc/sdhci-msm.txt
b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt
> index bfdcdc4..c2b7b2b 100644
> --- a/Documentation/devicetree/bindings/mmc/sdhci-msm.txt
> +++ b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt
> @@ -4,7 +4,10 @@ This file documents differences between the core
properties in mmc.txt
> and the properties used by the sdhci-msm driver.

> Required properties:
> -- compatible: Should contain "qcom,sdhci-msm-v4".
> +- compatible: Should contain "qcom,sdhci-msm-v4" or "qcom,sdhci-msm-v5".
> + For SDCC version 5.0.0, MCI registers are removed from
SDCC
> + interface and some registers are moved to HC. New
compatible
> + string is added to support this change -
"qcom,sdhci-msm-v5".
> - reg: Base address and length of the register in the following order:
> - Host controller register map (required)
> - SD Core register map (required)
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index bb2bb59..408e6b2 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -33,16 +33,11 @@
> #define CORE_MCI_GENERICS 0x70
> #define SWITCHABLE_SIGNALING_VOLTAGE BIT(29)

> -#define CORE_HC_MODE 0x78

Remove CORE_MCI_VERSION as well.

> #define HC_MODE_EN 0x1
> #define CORE_POWER 0x0
> #define CORE_SW_RST BIT(7)
> #define FF_CLK_SW_RST_DIS BIT(13)

> -#define CORE_PWRCTL_STATUS 0xdc
> -#define CORE_PWRCTL_MASK 0xe0
> -#define CORE_PWRCTL_CLEAR 0xe4
> -#define CORE_PWRCTL_CTL 0xe8
> #define CORE_PWRCTL_BUS_OFF BIT(0)
> #define CORE_PWRCTL_BUS_ON BIT(1)
> #define CORE_PWRCTL_IO_LOW BIT(2)
> @@ -63,17 +58,13 @@
> #define CORE_CDR_EXT_EN BIT(19)
> #define CORE_DLL_PDN BIT(29)
> #define CORE_DLL_RST BIT(30)
> -#define CORE_DLL_CONFIG 0x100
> #define CORE_CMD_DAT_TRACK_SEL BIT(0)
> -#define CORE_DLL_STATUS 0x108

> -#define CORE_DLL_CONFIG_2 0x1b4
> #define CORE_DDR_CAL_EN BIT(0)
> #define CORE_FLL_CYCLE_CNT BIT(18)
> #define CORE_DLL_CLOCK_DISABLE BIT(21)

> -#define CORE_VENDOR_SPEC 0x10c
> -#define CORE_VENDOR_SPEC_POR_VAL 0xa1c
> +#define CORE_VENDOR_SPEC_POR_VAL 0xa1c
> #define CORE_CLK_PWRSAVE BIT(1)
> #define CORE_HC_MCLK_SEL_DFLT (2 << 8)
> #define CORE_HC_MCLK_SEL_HS400 (3 << 8)
> @@ -111,17 +102,14 @@
> #define CORE_CDC_SWITCH_BYPASS_OFF BIT(0)
> #define CORE_CDC_SWITCH_RC_EN BIT(1)

> -#define CORE_DDR_200_CFG 0x184
> #define CORE_CDC_T4_DLY_SEL BIT(0)
> #define CORE_CMDIN_RCLK_EN BIT(1)
> #define CORE_START_CDC_TRAFFIC BIT(6)
> -#define CORE_VENDOR_SPEC3 0x1b0
> +
> #define CORE_PWRSAVE_DLL BIT(3)

> -#define CORE_DDR_CONFIG 0x1b8
> #define DDR_CONFIG_POR_VAL 0x80040853

> -#define CORE_VENDOR_SPEC_CAPABILITIES0 0x11c

> #define INVALID_TUNING_PHASE -1
> #define SDHCI_MSM_MIN_CLOCK 400000
> @@ -380,10 +368,14 @@ static inline int msm_dll_poll_ck_out_en(struct
sdhci_host *host, u8 poll)
> u32 wait_cnt = 50;
> u8 ck_out_en;
> struct mmc_host *mmc = host->mmc;
> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> + const struct sdhci_msm_offset *msm_offset =
> + msm_host->offset;

I notice this pattern is pasted all over the place in order to get to the
offsets. Maybe a macro or inlined function would be cleaner to get you to
directly to the sdhci_msm_offset struct from sdhci_host, rather than this
blob of paste soup everywhere. In some places you do seem to use the
intermediate locals, so those cases wouldn't need to use the new helper.


> /* Poll for CK_OUT_EN bit. max. poll time = 50us */
> - ck_out_en = !!(readl_relaxed(host->ioaddr + CORE_DLL_CONFIG) &
> - CORE_CK_OUT_EN);
> + ck_out_en = !!(readl_relaxed(host->ioaddr +
> + msm_offset->core_dll_config) & CORE_CK_OUT_EN);

> while (ck_out_en != poll) {
> if (--wait_cnt == 0) {
> @@ -393,8 +385,8 @@ static inline int msm_dll_poll_ck_out_en(struct
sdhci_host *host, u8 poll)
> }
> udelay(1);

> - ck_out_en = !!(readl_relaxed(host->ioaddr +
CORE_DLL_CONFIG) &
> - CORE_CK_OUT_EN);
> + ck_out_en = !!(readl_relaxed(host->ioaddr +
> + msm_offset->core_dll_config) & CORE_CK_OUT_EN);
> }

> return 0;
> @@ -410,16 +402,20 @@ static int msm_config_cm_dll_phase(struct
sdhci_host *host, u8 phase)
> unsigned long flags;
> u32 config;
> struct mmc_host *mmc = host->mmc;
> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> + const struct sdhci_msm_offset *msm_offset =
> + msm_host->offset;

> if (phase > 0xf)
> return -EINVAL;

> spin_lock_irqsave(&host->lock, flags);

> - config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
> + config = readl_relaxed(host->ioaddr +
msm_offset->core_dll_config);
> config &= ~(CORE_CDR_EN | CORE_CK_OUT_EN);
> config |= (CORE_CDR_EXT_EN | CORE_DLL_EN);
> - writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);
> + writel_relaxed(config, host->ioaddr +
msm_offset->core_dll_config);

> /* Wait until CK_OUT_EN bit of DLL_CONFIG register becomes '0' */
> rc = msm_dll_poll_ck_out_en(host, 0);
> @@ -430,24 +426,24 @@ static int msm_config_cm_dll_phase(struct
sdhci_host *host, u8 phase)
> * Write the selected DLL clock output phase (0 ... 15)
> * to CDR_SELEXT bit field of DLL_CONFIG register.
> */
> - config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
> + config = readl_relaxed(host->ioaddr +
msm_offset->core_dll_config);
> config &= ~CDR_SELEXT_MASK;
> config |= grey_coded_phase_table[phase] << CDR_SELEXT_SHIFT;
> - writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);
> + writel_relaxed(config, host->ioaddr +
msm_offset->core_dll_config);

> - config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
> + config = readl_relaxed(host->ioaddr +
msm_offset->core_dll_config);
> config |= CORE_CK_OUT_EN;
> - writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);
> + writel_relaxed(config, host->ioaddr +
msm_offset->core_dll_config);

> /* Wait until CK_OUT_EN bit of DLL_CONFIG register becomes '1' */
> rc = msm_dll_poll_ck_out_en(host, 1);
> if (rc)
> goto err_out;

> - config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
> + config = readl_relaxed(host->ioaddr +
msm_offset->core_dll_config);
> config |= CORE_CDR_EN;
> config &= ~CORE_CDR_EXT_EN;
> - writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);
> + writel_relaxed(config, host->ioaddr +
msm_offset->core_dll_config);

Nit: host->ioaddr + msm_offset->core_dll_config might benefit from having
its own local, since you use it so much in this function. Same goes for
where I've noted below...

> goto out;

> err_out:
> @@ -573,6 +569,10 @@ static int msm_find_most_appropriate_phase(struct
sdhci_host *host,
> static inline void msm_cm_dll_set_freq(struct sdhci_host *host)
> {
> u32 mclk_freq = 0, config;
> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> + const struct sdhci_msm_offset *msm_offset =
> + msm_host->offset;

> /* Program the MCLK value to MCLK_FREQ bit field */
> if (host->clock <= 112000000)
> @@ -592,10 +592,10 @@ static inline void msm_cm_dll_set_freq(struct
sdhci_host *host)
> else if (host->clock <= 200000000)
> mclk_freq = 7;

> - config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
> + config = readl_relaxed(host->ioaddr +
msm_offset->core_dll_config);
> config &= ~CMUX_SHIFT_PHASE_MASK;
> config |= mclk_freq << CMUX_SHIFT_PHASE_SHIFT;
> - writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);
> + writel_relaxed(config, host->ioaddr +
msm_offset->core_dll_config);
> }

> /* Initialize the DLL (Programmable Delay Line) */
> @@ -607,6 +607,8 @@ static int msm_init_cm_dll(struct sdhci_host *host)
> int wait_cnt = 50;
> unsigned long flags;
> u32 config;
> + const struct sdhci_msm_offset *msm_offset =
> + msm_host->offset;

> spin_lock_irqsave(&host->lock, flags);

> @@ -615,34 +617,43 @@ static int msm_init_cm_dll(struct sdhci_host *host)
> * tuning is in progress. Keeping PWRSAVE ON may
> * turn off the clock.
> */
> - config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
> + config = readl_relaxed(host->ioaddr +
msm_offset->core_vendor_spec);
> config &= ~CORE_CLK_PWRSAVE;
> - writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
> + writel_relaxed(config, host->ioaddr +
msm_offset->core_vendor_spec);

> if (msm_host->use_14lpp_dll_reset) {
> - config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
> + config = readl_relaxed(host->ioaddr +
> + msm_offset->core_dll_config);
> config &= ~CORE_CK_OUT_EN;
> - writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);
> + writel_relaxed(config, host->ioaddr +
> + msm_offset->core_dll_config);

> - config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2);
> + config = readl_relaxed(host->ioaddr +
> + msm_offset->core_dll_config_2);
> config |= CORE_DLL_CLOCK_DISABLE;
> - writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG_2);
> + writel_relaxed(config, host->ioaddr +
> + msm_offset->core_dll_config_2);
> }

> - config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
> + config = readl_relaxed(host->ioaddr +
> + msm_offset->core_dll_config);
> config |= CORE_DLL_RST;
> - writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);
> + writel_relaxed(config, host->ioaddr +
> + msm_offset->core_dll_config);

> - config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
> + config = readl_relaxed(host->ioaddr +
> + msm_offset->core_dll_config);
> config |= CORE_DLL_PDN;
> - writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);
> + writel_relaxed(config, host->ioaddr +
> + msm_offset->core_dll_config);
> msm_cm_dll_set_freq(host);

> if (msm_host->use_14lpp_dll_reset &&
> !IS_ERR_OR_NULL(msm_host->xo_clk)) {
> u32 mclk_freq = 0;

> - config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2);
> + config = readl_relaxed(host->ioaddr +
> + msm_offset->core_dll_config_2);
> config &= CORE_FLL_CYCLE_CNT;
> if (config)
> mclk_freq = DIV_ROUND_CLOSEST_ULL((host->clock *
8),
> @@ -651,40 +662,52 @@ static int msm_init_cm_dll(struct sdhci_host *host)
> mclk_freq = DIV_ROUND_CLOSEST_ULL((host->clock *
4),
> clk_get_rate(msm_host->xo_clk));

> - config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2);
> + config = readl_relaxed(host->ioaddr +
> + msm_offset->core_dll_config_2);
> config &= ~(0xFF << 10);
> config |= mclk_freq << 10;

> - writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG_2);
> + writel_relaxed(config, host->ioaddr +
> + msm_offset->core_dll_config_2);
> /* wait for 5us before enabling DLL clock */
> udelay(5);
> }

> - config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
> + config = readl_relaxed(host->ioaddr +
> + msm_offset->core_dll_config);
> config &= ~CORE_DLL_RST;
> - writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);
> + writel_relaxed(config, host->ioaddr +
> + msm_offset->core_dll_config);

> - config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
> + config = readl_relaxed(host->ioaddr +
> + msm_offset->core_dll_config);
> config &= ~CORE_DLL_PDN;
> - writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);
> + writel_relaxed(config, host->ioaddr +
> + msm_offset->core_dll_config);

> if (msm_host->use_14lpp_dll_reset) {
> msm_cm_dll_set_freq(host);
> - config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2);
> + config = readl_relaxed(host->ioaddr +
> + msm_offset->core_dll_config_2);
> config &= ~CORE_DLL_CLOCK_DISABLE;
> - writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG_2);
> + writel_relaxed(config, host->ioaddr +
> + msm_offset->core_dll_config_2);
> }

> - config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
> + config = readl_relaxed(host->ioaddr +
> + msm_offset->core_dll_config);
> config |= CORE_DLL_EN;
> - writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);
> + writel_relaxed(config, host->ioaddr +
> + msm_offset->core_dll_config);

> - config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
> + config = readl_relaxed(host->ioaddr +
> + msm_offset->core_dll_config);
> config |= CORE_CK_OUT_EN;
> - writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);
> + writel_relaxed(config, host->ioaddr +
> + msm_offset->core_dll_config);


...here. A local for host->ioaddr + msm_offset->core_dll_config would save
you a lot of split lines.

> @@ -1272,12 +1327,17 @@ static void sdhci_msm_dump_pwr_ctrl_regs(struct
sdhci_host *host)
> {
> struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> + const struct sdhci_msm_offset *msm_offset =
> + msm_host->offset;

> pr_err("%s: PWRCTL_STATUS: 0x%08x | PWRCTL_MASK: 0x%08x |
PWRCTL_CTL: 0x%08x\n",
> - mmc_hostname(host->mmc),
> - readl_relaxed(msm_host->core_mem +
CORE_PWRCTL_STATUS),
> - readl_relaxed(msm_host->core_mem +
CORE_PWRCTL_MASK),
> - readl_relaxed(msm_host->core_mem +
CORE_PWRCTL_CTL));
> + mmc_hostname(host->mmc),
> + msm_host->var_ops->msm_readl_relaxed(host,

There's a weird extra space here.

> + msm_offset->core_pwrctl_status),
> + msm_host->var_ops->msm_readl_relaxed(host,
> + msm_offset->core_pwrctl_mask),
> + msm_host->var_ops->msm_readl_relaxed(host,
> + msm_offset->core_pwrctl_ctl));

I think the idea of function pointers is fine, but overall the use of them
everywhere sure is ugly. It makes it really hard to actually see what's
happening. I wonder if things might look a lot cleaner with a helper
function here. Then instead of:

msm_host->var_ops->msm_readl_relaxed(host, msm_offset->core_pwrctl_ctl);

You could have

msm_core_read(host, msm_offset->core_pwrctl_ctl);

> @@ -1553,7 +1619,8 @@ static void sdhci_msm_set_regulator_caps(struct
sdhci_msm_host *msm_host)
> */
> u32 io_level = msm_host->curr_io_level;

> - config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
> + config = readl_relaxed(host->ioaddr +
> + msm_offset->core_vendor_spec);

Remove the second space before the readl_relaxed.

> @@ -1710,32 +1793,40 @@ static int sdhci_msm_probe(struct platform_device
*pdev)
> dev_warn(&pdev->dev, "TCXO clk not present (%d)\n", ret);
> }

> - core_memres = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> - msm_host->core_mem = devm_ioremap_resource(&pdev->dev,
core_memres);
> + if (!msm_host->mci_removed) {
> + core_memres = platform_get_resource(pdev, IORESOURCE_MEM,
1);
> + msm_host->core_mem = devm_ioremap_resource(&pdev->dev,
> + core_memres);

> - if (IS_ERR(msm_host->core_mem)) {
> - dev_err(&pdev->dev, "Failed to remap registers\n");
> - ret = PTR_ERR(msm_host->core_mem);
> - goto clk_disable;
> + if (IS_ERR(msm_host->core_mem)) {
> + dev_err(&pdev->dev, "Failed to remap
registers\n");
> + ret = PTR_ERR(msm_host->core_mem);
> + goto clk_disable;
> + }
> }

> /* Reset the vendor spec register to power on reset state */
> writel_relaxed(CORE_VENDOR_SPEC_POR_VAL,
> - host->ioaddr + CORE_VENDOR_SPEC);
> -
> - /* Set HC_MODE_EN bit in HC_MODE register */
> - writel_relaxed(HC_MODE_EN, (msm_host->core_mem + CORE_HC_MODE));
> -
> - config = readl_relaxed(msm_host->core_mem + CORE_HC_MODE);
> - config |= FF_CLK_SW_RST_DIS;
> - writel_relaxed(config, msm_host->core_mem + CORE_HC_MODE);
> + host->ioaddr + msm_offset->core_vendor_spec);
> +
> + if (!msm_host->mci_removed) {
> + /* Set HC_MODE_EN bit in HC_MODE register */
> + msm_host->var_ops->msm_writel_relaxed(HC_MODE_EN, host,
> + msm_offset->core_hc_mode);
> + config = msm_host->var_ops->msm_readl_relaxed(host,
> + msm_offset->core_hc_mode);
> + config |= FF_CLK_SW_RST_DIS;
> + msm_host->var_ops->msm_writel_relaxed(config, host,
> + msm_offset->core_hc_mode);
> + }

> host_version = readw_relaxed((host->ioaddr + SDHCI_HOST_VERSION));
> dev_dbg(&pdev->dev, "Host Version: 0x%x Vendor Version 0x%x\n",
> host_version, ((host_version & SDHCI_VENDOR_VER_MASK) >>
> SDHCI_VENDOR_VER_SHIFT));

> - core_version = readl_relaxed(msm_host->core_mem +
CORE_MCI_VERSION);
> + core_version = msm_host->var_ops->msm_readl_relaxed(host,
> + msm_offset->core_mci_version);

Another double space after the =. Perhaps this was a find/replace error?
Look out for more of these that I missed.

-Evan

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