[U-Boot] [PATCH v2] socfpga/dwmmc: Adding DesignWare MMC driver support for SOCFPGA

[Jaehoon Chung]

Hi, Chin.

On 12/19/2013 02:16 AM, Chin Liang See wrote:
> To add the DesignWare MMC driver support for Altera SOCFPGA. It
> required information such as clocks and bus width from platform
> specific files (SOCFPGA handoff files)
> 
> Signed-off-by: Chin Liang See <clsee at altera.com>
> Cc: Rajeshwari Shinde <rajeshwari.s at samsung.com>
> Cc: Jaehoon Chung <jh80.chung at samsung.com>
> Cc: Andy Fleming <afleming at freescale.com>
> Cc: Pantelis Antoniou <panto at antoniou-consulting.com>
> ---
> Changes for v2
> - Adding u-boot-mmc maintainer
> ---
>  arch/arm/include/asm/arch-socfpga/dwmmc.h |   12 +++++
>  drivers/mmc/Makefile                      |    1 +
>  drivers/mmc/socfpga_dw_mmc.c              |   72 +++++++++++++++++++++++++++++
>  3 files changed, 85 insertions(+)
>  create mode 100755 arch/arm/include/asm/arch-socfpga/dwmmc.h
>  create mode 100755 drivers/mmc/socfpga_dw_mmc.c
> 
> diff --git a/arch/arm/include/asm/arch-socfpga/dwmmc.h b/arch/arm/include/asm/arch-socfpga/dwmmc.h
> new file mode 100755
> index 0000000..945eb64
> --- /dev/null
> +++ b/arch/arm/include/asm/arch-socfpga/dwmmc.h
> @@ -0,0 +1,12 @@
> +/*
> + * (C) Copyright 2013 Altera Corporation <www.altera.com>
> + *
> + * SPDX-License-Identifier:	GPL-2.0+
> + */
> +
> +#ifndef	_SOCFPGA_DWMMC_H_
> +#define	_SOCFPGA_DWMMC_H_
> +
> +extern int socfpga_dwmmc_init(u32 regbase, int bus_width, int index);
> +
> +#endif /* _SOCFPGA_SDMMC_H_ */
> diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
> index 1ed26ca..e793ed9 100644
> --- a/drivers/mmc/Makefile
> +++ b/drivers/mmc/Makefile
> @@ -28,6 +28,7 @@ obj-$(CONFIG_TEGRA_MMC) += tegra_mmc.o
>  obj-$(CONFIG_DWMMC) += dw_mmc.o
>  obj-$(CONFIG_EXYNOS_DWMMC) += exynos_dw_mmc.o
>  obj-$(CONFIG_ZYNQ_SDHCI) += zynq_sdhci.o
> +obj-$(CONFIG_SOCFPGA_DWMMC) += socfpga_dw_mmc.o
>  ifdef CONFIG_SPL_BUILD
>  obj-$(CONFIG_SPL_MMC_BOOT) += fsl_esdhc_spl.o
>  else
> diff --git a/drivers/mmc/socfpga_dw_mmc.c b/drivers/mmc/socfpga_dw_mmc.c
> new file mode 100755
> index 0000000..554f51b
> --- /dev/null
> +++ b/drivers/mmc/socfpga_dw_mmc.c
> @@ -0,0 +1,72 @@
> +/*
> + * (C) Copyright 2013 Altera Corporation <www.altera.com>
> + *
> + * SPDX-License-Identifier:	GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <malloc.h>
> +#include <dwmmc.h>
> +#include <asm/arch/dwmmc.h>
> +
> +#define CLKMGR_PERPLLGRP_EN_REG		(SOCFPGA_CLKMGR_ADDRESS + 0xA0)
> +#define CLKMGR_SDMMC_CLK_ENABLE		(1 << 8)
> +#define SYSMGR_SDMMCGRP_CTRL_REG	(SOCFPGA_SYSMGR_ADDRESS + 0x108)
Where is SOCFPGA_CLKMGR_ADDRESS defined?

> +#define SYSMGR_SDMMC_CTRL_GET_DRVSEL(x)	(((x) >> 0) & 0x7)
((x) & 0x7) is more readable?
> +#define SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel)	\
> +	((((drvsel) << 0) & 0x7) | (((smplsel) << 3) & 0x38))
> +
> +static char *SOCFPGA_NAME = "SOCFPGA DWMMC";
> +
> +static void socfpga_dwmci_clksel(struct dwmci_host *host)
> +{
> +	unsigned int en;
> +	unsigned int drvsel;
> +	unsigned int smplsel;
> +
> +	/* Disable SDMMC clock. */
> +	en = readl(CLKMGR_PERPLLGRP_EN_REG);
> +	en &= ~CLKMGR_SDMMC_CLK_ENABLE;
> +	writel(en, CLKMGR_PERPLLGRP_EN_REG);
> +
> +	/* Configures drv_sel and smpl_sel */
> +	drvsel = 3;
> +	smplsel = 0;
Is this value static? then why is value assigned drvsel and smpsel at here?
I didn't know that SOCFPGA is only used with drvsel = 3, smplsel = 0.
But if you need to change this value for other SoC version in future, I think that hard coding is not good.

> +
> +	debug("%s: drvsel %d smplsel %d\n", __FUNCTION__, drvsel, smplsel);
> +	writel(SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel),
> +		SYSMGR_SDMMCGRP_CTRL_REG);
> +
> +	debug("%s: SYSMGR_SDMMCGRP_CTRL_REG = 0x%x\n", __FUNCTION__,
> +		readl(SYSMGR_SDMMCGRP_CTRL_REG));
> +	/* Enable SDMMC clock */
> +	en = readl(CLKMGR_PERPLLGRP_EN_REG);
> +	en |= CLKMGR_SDMMC_CLK_ENABLE;
> +	writel(en, CLKMGR_PERPLLGRP_EN_REG);
> +}
> +
> +int socfpga_dwmmc_init(u32 regbase, int bus_width, int index)
> +{
> +	struct dwmci_host *host = NULL;
> +	host = calloc(sizeof(struct dwmci_host), 1);
> +	if (!host) {
> +		printf("dwmci_host calloc fail!\n");
> +		return 1;
> +	}
> +
> +	host->name = SOCFPGA_NAME;
> +	host->ioaddr = (void *)regbase;
> +	host->buswidth = bus_width;
> +	host->clksel = socfpga_dwmci_clksel;
> +	host->dev_index = index;
> +	/* fixed clock divide by 4 which due to the SDMMC wrapper */
> +	host->bus_hz = CONFIG_DWMMC_BUS_HZ;
I didn't want to use the CONFIG_DWMMC_BUS_HZ.

> +	host->fifoth_val = MSIZE(0x2) |
> +		RX_WMARK(CONFIG_DWMMC_FIFO_DEPTH / 2 - 1) |
> +		TX_WMARK(CONFIG_DWMMC_FIFO_DEPTH / 2);
> +
> +	add_dwmci(host, host->bus_hz, 400000);
add_dwmci() has the return value.

Best Regards,
Jaehoon Chung
> +
> +	return 0;
> +}
> +
>