[PATCH v8 1/2] mmc: ca_dw_mmc: Misc cleanup of driver

[Alex Nemirovsky <Alex.Nemirovsky@cortina-access.com>]

Hi Peng,

this patch set seems to have stalled.  There was some confusion as most of the driver
was already pushed to master and thus a new patch was created for some some misc cleanup.
 Could you review?

Thanks
Alex
> On May 21, 2020, at 5:24 PM, Alex Nemirovsky <alex.nemirovsky@cortina-access.com> wrote:
> 
> From: Arthur Li <arthur.li@cortina-access.com>
> 
> - Rename DT compatible name
> - Remove uneccessary if-statement to support 8-bit buswidth
> - Remove redundant error msg
> - Use symbolic constants in switch statement
> 
> Signed-off-by: Arthur Li <arthur.li@cortina-access.com>
> Signed-off-by: Alex Nemirovsky <alex.nemirovsky@cortina-access.com>
> CC: Peng Fan <peng.fan@nxp.com>
> CC: Jaehoon Chung <jh80.chung@samsung.com>
> CC: Tom Rini <trini@konsulko.com>
> ---
> 
> Changes in v8:
> - No code change
> - Split out individual driver from Cortina Package 2 patch series
> to help streamline acceptence into master
> 
> Changes in v7: None
> Changes in v5:
> - Rebase code basis on v2020.04-rc5 which has
>  already incorporated CAxxxx eMMC initial baseline
> 
> Changes in v4:
> - Rename DT compatible name
> - Remove uneccessary if-statement to support 8-bit buswidth
> - Remove redundant error msg
> - Use symbolic constants in switch statement
> 
> drivers/mmc/ca_dw_mmc.c | 34 ++++++++++++----------------------
> 1 file changed, 12 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/mmc/ca_dw_mmc.c b/drivers/mmc/ca_dw_mmc.c
> index acbc850..198c41f 100644
> --- a/drivers/mmc/ca_dw_mmc.c
> +++ b/drivers/mmc/ca_dw_mmc.c
> @@ -19,6 +19,7 @@
> 
> #define SD_CLK_SEL_200MHZ (0x2)
> #define SD_CLK_SEL_100MHZ (0x1)
> +#define SD_CLK_SEL_50MHZ (0x0)
> 
> #define IO_DRV_SD_DS_OFFSET (16)
> #define IO_DRV_SD_DS_MASK   (0xff << IO_DRV_SD_DS_OFFSET)
> @@ -44,15 +45,11 @@ static void ca_dwmci_clksel(struct dwmci_host *host)
> 	struct ca_dwmmc_priv_data *priv = host->priv;
> 	u32 val = readl(priv->sd_dll_reg);
> 
> -	if (host->bus_hz >= 200000000) {
> -		val &= ~SD_CLK_SEL_MASK;
> +	val &= ~SD_CLK_SEL_MASK;
> +	if (host->bus_hz >= 200000000)
> 		val |= SD_CLK_SEL_200MHZ;
> -	} else if (host->bus_hz >= 100000000) {
> -		val &= ~SD_CLK_SEL_MASK;
> +	else if (host->bus_hz >= 100000000)
> 		val |= SD_CLK_SEL_100MHZ;
> -	} else {
> -		val &= ~SD_CLK_SEL_MASK;
> -	}
> 
> 	writel(val, priv->sd_dll_reg);
> }
> @@ -77,14 +74,14 @@ unsigned int ca_dwmci_get_mmc_clock(struct dwmci_host *host, uint freq)
> 	u8 clk_div;
> 
> 	switch (sd_clk_sel) {
> -	case 2:
> -		clk_div = 1;
> +	case SD_CLK_SEL_50MHZ:
> +		clk_div = 4;
> 		break;
> -	case 1:
> +	case SD_CLK_SEL_100MHZ:
> 		clk_div = 2;
> 		break;
> 	default:
> -		clk_div = 4;
> +		clk_div = 1;
> 	}
> 
> 	return SD_SCLK_MAX / clk_div / (host->div + 1);
> @@ -100,9 +97,6 @@ static int ca_dwmmc_ofdata_to_platdata(struct udevice *dev)
> 	host->dev_index = 0;
> 
> 	host->buswidth = dev_read_u32_default(dev, "bus-width", 1);
> -	if (host->buswidth != 1 && host->buswidth != 4)
> -		return -EINVAL;
> -
> 	host->bus_hz = dev_read_u32_default(dev, "max-frequency", 50000000);
> 	priv->ds = dev_read_u32_default(dev, "io_ds", 0x33);
> 	host->fifo_mode = dev_read_bool(dev, "fifo-mode");
> @@ -118,10 +112,8 @@ static int ca_dwmmc_ofdata_to_platdata(struct udevice *dev)
> 		return -EINVAL;
> 
> 	host->ioaddr = dev_read_addr_ptr(dev);
> -	if (host->ioaddr == (void *)FDT_ADDR_T_NONE) {
> -		printf("DWMMC: base address is invalid\n");
> +	if (!host->ioaddr)
> 		return -EINVAL;
> -	}
> 
> 	host->priv = priv;
> 
> @@ -140,10 +132,8 @@ static int ca_dwmmc_probe(struct udevice *dev)
> 	memcpy(&ca_dwmci_dm_ops, &dm_dwmci_ops, sizeof(struct dm_mmc_ops));
> 
> 	dwmci_setup_cfg(&plat->cfg, host, host->bus_hz, MIN_FREQ);
> -	if (host->buswidth == 1) {
> -		(&plat->cfg)->host_caps &= ~MMC_MODE_8BIT;
> -		(&plat->cfg)->host_caps &= ~MMC_MODE_4BIT;
> -	}
> +	if (host->buswidth == 1)
> +		(&plat->cfg)->host_caps &= ~(MMC_MODE_8BIT | MMC_MODE_4BIT);
> 
> 	host->mmc = &plat->mmc;
> 	host->mmc->priv = &priv->host;
> @@ -164,7 +154,7 @@ static int ca_dwmmc_bind(struct udevice *dev)
> }
> 
> static const struct udevice_id ca_dwmmc_ids[] = {
> -	{ .compatible = "snps,dw-cortina" },
> +	{ .compatible = "cortina,ca-mmc" },
> 	{ }
> };
> 
> -- 
> 2.7.4
>