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SubjectRe: [PATCH V2 2/4] mmc: sdhci-msm: Add msm version specific ops and data structures
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Hi Stephen,

On 6/13/2018 5:06 AM, Stephen Boyd wrote:
> Quoting Vijay Viswanath (2018-05-29 02:52:39)
>> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
>> index 4050c99..2a66aa0 100644
>> --- a/drivers/mmc/host/sdhci-msm.c
>> +++ b/drivers/mmc/host/sdhci-msm.c
>> @@ -226,6 +226,24 @@ struct sdhci_msm_offset {
>> .core_ddr_config_2 = 0x1bc,
>> };
>>
>> +struct sdhci_msm_variant_ops {
>> + u8 (*msm_readb_relaxed)(struct sdhci_host *host, u32 offset);
>> + u32 (*msm_readl_relaxed)(struct sdhci_host *host, u32 offset);
>> + void (*msm_writeb_relaxed)(u8 val, struct sdhci_host *host, u32 offset);
>> + void (*msm_writel_relaxed)(u32 val, struct sdhci_host *host,
>> + u32 offset);
>> +};
>> +
>> +/*
>> + * From V5, register spaces have changed. Wrap this info in a structure
>> + * and choose the data_structure based on version info mentioned in DT.
>> + */
>
> This is sort of odd. Usually we have a read/write function that swizzles
> based on register variants, and that's contained with that function. Now
> it's the other way.
>
>> +struct sdhci_msm_variant_info {
>> + bool mci_removed;
>> + const struct sdhci_msm_variant_ops *var_ops;
>> + const struct sdhci_msm_offset *offset;
>> +};
>> +
>> struct sdhci_msm_host {
>> struct platform_device *pdev;
>> void __iomem *core_mem; /* MSM SDCC mapped address */
>> @@ -245,8 +263,45 @@ struct sdhci_msm_host {
>> wait_queue_head_t pwr_irq_wait;
>> bool pwr_irq_flag;
>> u32 caps_0;
>> + bool mci_removed;
>> + const struct sdhci_msm_variant_ops *var_ops;
>> + const struct sdhci_msm_offset *offset;
>> };
>>
>> +/*
>> + * APIs to read/write to vendor specific registers which were there in the
>> + * core_mem region before MCI was removed.
>> + */
>> +static u32 sdhci_msm_mci_variant_readl_relaxed(struct sdhci_host *host,
>> + u32 offset)
>> +{
>> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>> + struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
>> +
>> + return readl_relaxed(msm_host->core_mem + offset);
>
> Is core_mem assigned in the new hardware? Maybe that needs to be
> 'repurposed' for vendor specific registers on v5 and renamed to
> something like msm_host::vendor_base or something like that.
>

There is no core_mem in the new hardware. We can assign hc_mem address
to core_mem variable (if SDCC5) and do away with the need of special
read/write functions, but I feel thats a bad approach and misleading.

>> +}
>> +
>> +static u32 sdhci_msm_v5_variant_readl_relaxed(struct sdhci_host *host,
>> + u32 offset)
>> +{
>> + return readl_relaxed(host->ioaddr + offset);
>> +}
>> +
>> +static void sdhci_msm_mci_variant_writel_relaxed(u32 val,
>> + struct sdhci_host *host, u32 offset)
>> +{
>> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>> + struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
>> +
>> + writel_relaxed(val, msm_host->core_mem + offset);
>> +}
>> +
>> +static void sdhci_msm_v5_variant_writel_relaxed(u32 val,
>> + struct sdhci_host *host, u32 offset)
>> +{
>> + writel_relaxed(val, host->ioaddr + offset);
>> +}
>> +
>> static unsigned int msm_get_clock_rate_for_bus_mode(struct sdhci_host *host,
>> unsigned int clock)
>> {
>> @@ -1481,6 +1536,28 @@ static void sdhci_msm_set_regulator_caps(struct sdhci_msm_host *msm_host)
>> pr_debug("%s: supported caps: 0x%08x\n", mmc_hostname(mmc), caps);
>> }
>>
>> +static const struct sdhci_msm_variant_ops mci_var_ops = {
>> + .msm_readl_relaxed = sdhci_msm_mci_variant_readl_relaxed,
>> + .msm_writel_relaxed = sdhci_msm_mci_variant_writel_relaxed,
>> +};
>> +
>> +static const struct sdhci_msm_variant_ops v5_var_ops = {
>> + .msm_readl_relaxed = sdhci_msm_v5_variant_readl_relaxed,
>> + .msm_writel_relaxed = sdhci_msm_v5_variant_writel_relaxed,
>> +};
>> +
>> +static const struct sdhci_msm_variant_info sdhci_msm_mci_var = {
>> + .mci_removed = 0,
>
> Please use true and false instead of 0 and 1 when the type is bool.
>

Will do

>> + .var_ops = &mci_var_ops,
>> + .offset = &sdhci_msm_mci_offset,
>> +};
>> +
>> +static const struct sdhci_msm_variant_info sdhci_msm_v5_var = {
>> + .mci_removed = 1,
>> + .var_ops = &v5_var_ops,
>> + .offset = &sdhci_msm_v5_offset,
>> +};
> --
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