linux-kernel - Re: [PATCH 2/5] drivers: mmc: sdhci-cadence: enable MMC_SDHCI_IO

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Message-ID: <35ea0a7a-3d63-26b7-4dc3-69f6ca41909a@intel.com>
Date:   Wed, 11 Jan 2023 10:23:43 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Piyush Malgujar <pmalgujar@...vell.com>, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, ulf.hansson@...aro.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        yamada.masahiro@...ionext.com, devicetree@...r.kernel.org
Cc:     jannadurai@...vell.com, cchavva@...vell.com
Subject: Re: [PATCH 2/5] drivers: mmc: sdhci-cadence: enable
 MMC_SDHCI_IO_ACCESSORS

On 19/12/22 16:24, Piyush Malgujar wrote:
> From: Jayanthi Annadurai <jannadurai@...vell.com>
> 
> Add support for CONFIG_MMC_SDHCI_IO_ACCESSORS for controller
> specific register read and write APIs.
> 
> Signed-off-by: Jayanthi Annadurai <jannadurai@...vell.com>
> Signed-off-by: Piyush Malgujar <pmalgujar@...vell.com>
> ---
>  drivers/mmc/host/Kconfig         | 12 ++++++
>  drivers/mmc/host/sdhci-cadence.c | 63 ++++++++++++++++++++++++++++++++
>  2 files changed, 75 insertions(+)
> 
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index 5e19a961c34d7b5664ab2fd43cfba82dc90913ac..b5b2ae0bb4625bdb9d17acdbb1887c9caa3a1f32 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -262,6 +262,18 @@ config MMC_SDHCI_CADENCE
>  
>  	  If unsure, say N.
>  
> +config MMC_SDHCI_CN10K
> +	tristate "SDHCI Cadence support for Marvell CN10K platforms"
> +	select MMC_SDHCI_CADENCE
> +	select MMC_SDHCI_IO_ACCESSORS

Probably better to just add MMC_SDHCI_IO_ACCESSORS to 
config MMC_SDHCI_CADENCE and drop MMC_SDHCI_CN10K

> +	help
> +	  This selects the SDHCI cadence driver and IO Accessors
> +	  for Marvell CN10K platforms
> +
> +	  If you have Marvell CN10K platform, say Y or M here.
> +
> +	  If unsure, say N.
> +
>  config MMC_SDHCI_CNS3XXX
>  	tristate "SDHCI support on the Cavium Networks CNS3xxx SoC"
>  	depends on ARCH_CNS3XXX || COMPILE_TEST
> diff --git a/drivers/mmc/host/sdhci-cadence.c b/drivers/mmc/host/sdhci-cadence.c
> index 5332d19e489be936d6814feba4f0fc046f5e130e..6bf703f15bc5be7e3be4cb1144b78ec3585ec540 100644
> --- a/drivers/mmc/host/sdhci-cadence.c
> +++ b/drivers/mmc/host/sdhci-cadence.c
> @@ -449,6 +449,61 @@ static u32 read_dqs_cmd_delay, clk_wrdqs_delay, clk_wr_delay, read_dqs_delay;
>  
>  static u32 sdhci_cdns_sd6_get_mode(struct sdhci_host *host, unsigned int timing);
>  
> +#ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
> +static u32 sdhci_cdns_sd6_readl(struct sdhci_host *host, int reg)
> +{
> +	return readl(host->ioaddr + reg);
> +}
> +
> +static void sdhci_cdns_sd6_writel(struct sdhci_host *host, u32 val, int reg)
> +{
> +	writel(val, host->ioaddr + reg);
> +}
> +
> +static u16 sdhci_cdns_sd6_readw(struct sdhci_host *host, int reg)
> +{
> +	u32 val, regoff;
> +
> +	regoff = reg & ~3;
> +
> +	val = readl(host->ioaddr + regoff);
> +	if ((reg & 0x3) == 0)
> +		return (val & 0xFFFF);
> +	else
> +		return ((val >> 16) & 0xFFFF);
> +}
> +
> +static void sdhci_cdns_sd6_writew(struct sdhci_host *host, u16 val, int reg)
> +{
> +	writew(val, host->ioaddr + reg);
> +}
> +
> +static u8 sdhci_cdns_sd6_readb(struct sdhci_host *host, int reg)
> +{
> +	u32 val, regoff;
> +
> +	regoff = reg & ~3;
> +
> +	val = readl(host->ioaddr + regoff);
> +	switch (reg & 3) {
> +	case 0:
> +		return (val & 0xFF);
> +	case 1:
> +		return ((val >> 8) & 0xFF);
> +	case 2:
> +		return ((val >> 16) & 0xFF);
> +	case 3:
> +		return ((val >> 24) & 0xFF);
> +	}
> +	return 0;
> +}
> +
> +static void sdhci_cdns_sd6_writeb(struct sdhci_host *host, u8 val, int reg)
> +{
> +	writeb(val, host->ioaddr + reg);
> +}
> +#endif
> +
>  static int sdhci_cdns_sd6_phy_lock_dll(struct sdhci_cdns_sd6_phy *phy)
>  {
>  	u32 delay_element = phy->d.delay_element_org;
> @@ -1576,6 +1631,14 @@ static const struct sdhci_ops sdhci_cdns_sd4_ops = {
>  };
>  
>  static const struct sdhci_ops sdhci_cdns_sd6_ops = {
> +#ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
> +	.read_l = sdhci_cdns_sd6_readl,
> +	.write_l = sdhci_cdns_sd6_writel,
> +	.read_w = sdhci_cdns_sd6_readw,
> +	.write_w = sdhci_cdns_sd6_writew,
> +	.read_b = sdhci_cdns_sd6_readb,
> +	.write_b = sdhci_cdns_sd6_writeb,
> +#endif
>  	.get_max_clock = sdhci_cdns_get_max_clock,
>  	.set_clock = sdhci_cdns_sd6_set_clock,
>  	.get_timeout_clock = sdhci_cdns_get_timeout_clock,