[U-Boot] [PATCH v1 5/6] mmc: kona: Add Kona mmc driver

[Jaehoon Chung <jh80.chung@samsung.com>]

On 02/04/2014 06:03 AM, Darwin Rambo wrote:
> Add support for the Kona SDHCI found on Broadcom mobile SoCs.
> 
> Signed-off-by: Darwin Rambo <drambo@broadcom.com>
> Reviewed-by: Steve Rae <srae@broadcom.com>
> Reviewed-by: Tim Kryger <tkryger@linaro.org>
> ---
>  drivers/mmc/Makefile     |    1 +
>  drivers/mmc/kona_sdhci.c |  125 ++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 126 insertions(+)
>  create mode 100644 drivers/mmc/kona_sdhci.c
> 
> diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
> index e793ed9..931922b 100644
> --- a/drivers/mmc/Makefile
> +++ b/drivers/mmc/Makefile
> @@ -21,6 +21,7 @@ obj-$(CONFIG_OMAP_HSMMC) += omap_hsmmc.o
>  obj-$(CONFIG_PXA_MMC_GENERIC) += pxa_mmc_gen.o
>  obj-$(CONFIG_SDHCI) += sdhci.o
>  obj-$(CONFIG_BCM2835_SDHCI) += bcm2835_sdhci.o
> +obj-$(CONFIG_KONA_SDHCI) += kona_sdhci.o
>  obj-$(CONFIG_S5P_SDHCI) += s5p_sdhci.o
>  obj-$(CONFIG_SH_MMCIF) += sh_mmcif.o
>  obj-$(CONFIG_SPEAR_SDHCI) += spear_sdhci.o
> diff --git a/drivers/mmc/kona_sdhci.c b/drivers/mmc/kona_sdhci.c
> new file mode 100644
> index 0000000..69e6f17
> --- /dev/null
> +++ b/drivers/mmc/kona_sdhci.c
> @@ -0,0 +1,125 @@
> +/*
> + * Copyright 2013 Broadcom Corporation.  All rights reserved.
> + *
> + * SPDX-License-Identifier:      GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <malloc.h>
> +#include <sdhci.h>
> +#include <asm/errno.h>
> +#include <asm/kona-common/clk.h>
> +
> +#define SDHCI_CORECTRL_OFFSET		0x00008000
> +#define SDHCI_CORECTRL_EN		0x01
> +#define SDHCI_CORECTRL_RESET		0x02
> +
> +#define SDHCI_CORESTAT_OFFSET		0x00008004
> +#define SDHCI_CORESTAT_CD_SW		0x01
> +
> +#define SDHCI_COREIMR_OFFSET		0x00008008
> +#define SDHCI_COREIMR_IP		0x01
> +
> +static int init_mmc_core(struct sdhci_host *host)

I think that function name is used to "_kona_".
This function isn't general mmc function, right?

Best Regards,
Jaehoon Chung

> +{
> +	unsigned int mask;
> +	unsigned int timeout;
> +
> +	if (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & SDHCI_RESET_ALL) {
> +		printf("%s: sd host controller reset error\n", __func__);
> +		return 1;
> +	}
> +
> +	/* For kona a hardware reset before anything else. */
> +	mask = sdhci_readl(host, SDHCI_CORECTRL_OFFSET) | SDHCI_CORECTRL_RESET;
> +	sdhci_writel(host, mask, SDHCI_CORECTRL_OFFSET);
> +
> +	/* Wait max 100 ms */
> +	timeout = 1000;
> +	do {
> +		if (timeout == 0) {
> +			printf("%s: reset timeout error\n", __func__);
> +			return 1;
> +		}
> +		timeout--;
> +		udelay(100);
> +	} while (0 ==
> +		 (sdhci_readl(host, SDHCI_CORECTRL_OFFSET) &
> +		  SDHCI_CORECTRL_RESET));
> +
> +	/* Clear the reset bit. */
> +	mask = mask & ~SDHCI_CORECTRL_RESET;
> +	sdhci_writel(host, mask, SDHCI_CORECTRL_OFFSET);
> +	udelay(10);
> +
> +	/* Enable AHB clock */
> +	mask = sdhci_readl(host, SDHCI_CORECTRL_OFFSET);
> +	sdhci_writel(host, mask | SDHCI_CORECTRL_EN, SDHCI_CORECTRL_OFFSET);
> +
> +	/* Enable interrupts */
> +	sdhci_writel(host, SDHCI_COREIMR_IP, SDHCI_COREIMR_OFFSET);
> +
> +	/* Make sure Card is detected in controller */
> +	mask = sdhci_readl(host, SDHCI_CORESTAT_OFFSET);
> +	sdhci_writel(host, mask | SDHCI_CORESTAT_CD_SW, SDHCI_CORESTAT_OFFSET);
> +
> +	return 0;
> +}
> +
> +int kona_sdhci_init(int dev_index, u32 min_clk, u32 quirks)
> +{
> +	int ret = 0;
> +	u32 max_clk;
> +	void *reg_base;
> +	struct sdhci_host *host = NULL;
> +
> +	host = (struct sdhci_host *)malloc(sizeof(struct sdhci_host));
> +	if (!host) {
> +		printf("%s: sdhci host malloc fail!\n", __func__);
> +		return -ENOMEM;
> +	}
> +	switch (dev_index) {
> +	case 0:
> +		reg_base = (void *)CONFIG_SYS_SDIO_BASE0;
> +		ret = clk_sdio_enable(reg_base, CONFIG_SYS_SDIO0_MAX_CLK,
> +					&max_clk);
> +		break;
> +	case 1:
> +		reg_base = (void *)CONFIG_SYS_SDIO_BASE1;
> +		ret = clk_sdio_enable(reg_base, CONFIG_SYS_SDIO1_MAX_CLK,
> +					&max_clk);
> +		break;
> +	case 2:
> +		reg_base = (void *)CONFIG_SYS_SDIO_BASE2;
> +		ret = clk_sdio_enable(reg_base, CONFIG_SYS_SDIO2_MAX_CLK,
> +					&max_clk);
> +		break;
> +	case 3:
> +		reg_base = (void *)CONFIG_SYS_SDIO_BASE3;
> +		ret = clk_sdio_enable(reg_base, CONFIG_SYS_SDIO3_MAX_CLK,
> +					&max_clk);
> +		break;
> +	default:
> +		printf("%s: sdio dev index %d not supported\n",
> +		       __func__, dev_index);
> +		ret = -EINVAL;
> +	}
> +	if (ret)
> +		return ret;
> +
> +	host->name = "kona-sdhci";
> +	host->ioaddr = reg_base;
> +	host->quirks = quirks;
> +	host->host_caps = MMC_MODE_HC;
> +
> +	if (init_mmc_core(host))
> +		return -EINVAL;
> +
> +	if (quirks & SDHCI_QUIRK_REG32_RW)
> +		host->version = sdhci_readl(host, SDHCI_HOST_VERSION - 2) >> 16;
> +	else
> +		host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
> +
> +	add_sdhci(host, max_clk, min_clk);
> +	return ret;
> +}
>