RE: [PATCH 2/3] mmc: dw_mmc: add dw_mmc-k3 for k3 platform

[Seungwon Jeon <tgih.jun@samsung.com>]

On Sat, December 14, 2013, Zhangfei Gao wrote:
> Add dw_mmc-k3.c for k3v2, support sd/emmc
> 
> Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
> Signed-off-by: Zhigang Wang <brooke.wangzhigang@huawei.com>
> ---
>  .../devicetree/bindings/mmc/k3-dw-mshc.txt         |   60 +++++++++
>  drivers/mmc/host/Kconfig                           |   10 ++
>  drivers/mmc/host/Makefile                          |    1 +
>  drivers/mmc/host/dw_mmc-k3.c                       |  133 ++++++++++++++++++++
>  4 files changed, 204 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mmc/k3-dw-mshc.txt
>  create mode 100644 drivers/mmc/host/dw_mmc-k3.c
> 
> diff --git a/Documentation/devicetree/bindings/mmc/k3-dw-mshc.txt
> b/Documentation/devicetree/bindings/mmc/k3-dw-mshc.txt
> new file mode 100644
> index 000000000000..d7e2d7f159bb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mmc/k3-dw-mshc.txt
> @@ -0,0 +1,60 @@
> +* Hisilicon specific extensions to the Synopsys Designware Mobile
> +  Storage Host Controller
> +
> +Read synopsys-dw-mshc.txt for more details
> +
> +The Synopsys designware mobile storage host controller is used to interface
> +a SoC with storage medium such as eMMC or SD/MMC cards. This file documents
> +differences between the core Synopsys dw mshc controller properties described
> +by synopsys-dw-mshc.txt and the properties used by the Hisilicon specific
> +extensions to the Synopsys Designware Mobile Storage Host Controller.
> +
> +Required Properties:
> +
> +* compatible: should be one of the following.
> +  - "hisilicon,hi4511-dw-mshc": for controllers with hi4511 specific extentions.
> +
> +* clock-freq-table: should be the frequency (in Hz) array of the ciu clock
> +	in each	supported mode.
> +	0. CIU clock rate in Hz for DS mode
> +	1. CIU clock rate in Hz for MMC HS mode
> +	2. CIU clock rate in Hz for SD HS mode
> +	3. CIU clock rate in Hz for SDR12 mode
> +	4. CIU clock rate in Hz for SDR25 mode
> +	5. CIU clock rate in Hz for SDR50 mode
> +	6. CIU clock rate in Hz for SDR104 mode
> +	7. CIU clock rate in Hz for DDR50 mode
> +	8. CIU clock rate in Hz for HS200 mode
> +
> +Example:
> +
> +	/* for Hi3620 */
> +
> +	/* SoC portion */
> +	dwmmc_0: dwmmc0@fcd03000 {
> +		compatible = "hisilicon,hi4511-dw-mshc";
> +		reg = <0xfcd03000 0x1000>;
> +		interrupts = <0 16 4>;
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		clocks = <&mmc_clock HI3620_SD_CIUCLK>, <&clock HI3620_DDRC_PER_CLK>;
> +		clock-names = "ciu", "biu";
> +		clock-freq-table =
> +		<25000000 0 50000000 25000000 50000000 100000000 0 50000000>;
I think it could be solved with mmc->f_min and mmc->f_max(from clock-freq-min-max property)
if there is no limitation per each speed mode. As seeing described table, it looks that.

> +	};
> +
> +	/* Board portion */
> +	dwmmc0@fcd03000 {
> +		num-slots = <1>;
> +		vmmc-supply = <&ldo12>;
> +		fifo-depth = <0x100>;
> +		supports-highspeed;
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&sd_pmx_pins &sd_cfg_func1 &sd_cfg_func2>;
> +		slot@0 {
> +			reg = <0>;
> +			bus-width = <4>;
> +			disable-wp;
> +			cd-gpios = <&gpio10 3 0>;
> +		};
> +	};
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index 7fc5099e44b2..45aaa2de0f58 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -575,6 +575,16 @@ config MMC_DW_SOCFPGA
>  	  This selects support for Altera SoCFPGA specific extensions to the
>  	  Synopsys DesignWare Memory Card Interface driver.
> 
> +config MMC_DW_K3
> +	tristate "K3 specific extensions for Synopsys DW Memory Card Interface"
> +	depends on MMC_DW
> +	select MMC_DW_PLTFM
> +	select MMC_DW_IDMAC
> +	help
> +	  This selects support for Hisilicon K3 SoC specific extensions to the
> +	  Synopsys DesignWare Memory Card Interface driver. Select this option
> +	  for platforms based on Hisilicon K3 SoC's.
> +
>  config MMC_DW_PCI
>  	tristate "Synopsys Designware MCI support on PCI bus"
>  	depends on MMC_DW && PCI
> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> index c41d0c364509..64f5f8d35839 100644
> --- a/drivers/mmc/host/Makefile
> +++ b/drivers/mmc/host/Makefile
> @@ -43,6 +43,7 @@ obj-$(CONFIG_MMC_DW)		+= dw_mmc.o
>  obj-$(CONFIG_MMC_DW_PLTFM)	+= dw_mmc-pltfm.o
>  obj-$(CONFIG_MMC_DW_EXYNOS)	+= dw_mmc-exynos.o
>  obj-$(CONFIG_MMC_DW_SOCFPGA)	+= dw_mmc-socfpga.o
> +obj-$(CONFIG_MMC_DW_K3)		+= dw_mmc-k3.o
>  obj-$(CONFIG_MMC_DW_PCI)	+= dw_mmc-pci.o
>  obj-$(CONFIG_MMC_SH_MMCIF)	+= sh_mmcif.o
>  obj-$(CONFIG_MMC_JZ4740)	+= jz4740_mmc.o
> diff --git a/drivers/mmc/host/dw_mmc-k3.c b/drivers/mmc/host/dw_mmc-k3.c
> new file mode 100644
> index 000000000000..90ebee0ce5ef
> --- /dev/null
> +++ b/drivers/mmc/host/dw_mmc-k3.c
> @@ -0,0 +1,133 @@
> +/*
> + * Copyright (c) 2013 Linaro Ltd.
> + * Copyright (c) 2013 Hisilicon Limited.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/clk.h>
> +#include <linux/mmc/host.h>
> +#include <linux/mmc/dw_mmc.h>
> +#include <linux/of_address.h>
> +
> +#include "dw_mmc.h"
> +#include "dw_mmc-pltfm.h"
> +
> +#define MAX_NUMS	10
> +struct dw_mci_k3_priv_data {
> +	u32	clk_table[MAX_NUMS];
> +};
> +
> +static void dw_mci_k3_set_ios(struct dw_mci *host, struct mmc_ios *ios)
> +{
> +	struct dw_mci_k3_priv_data *priv = host->priv;
> +	u32 rate = priv->clk_table[ios->timing];
> +	int ret;
> +
> +	ret = clk_set_rate(host->ciu_clk, rate);
> +	if (ret)
> +		dev_warn(host->dev, "failed to set clock rate %uHz\n", rate);
> +
> +	host->bus_hz = clk_get_rate(host->ciu_clk);
> +}
> +
> +static int dw_mci_k3_parse_dt(struct dw_mci *host)
> +{
> +	struct dw_mci_k3_priv_data *priv;
> +	struct device_node *node = host->dev->of_node;
> +	struct property *prop;
> +	const __be32 *cur;
> +	u32 val, num = 0;
> +
> +	priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv) {
> +		dev_err(host->dev, "mem alloc failed for private data\n");
> +		return -ENOMEM;
> +	}
> +	host->priv = priv;
> +
> +	of_property_for_each_u32(node, "clock-freq-table", prop, cur, val) {
> +		if (num >= MAX_NUMS)
> +			break;
> +		priv->clk_table[num++] = val;
> +	}
> +	return 0;
> +}
> +
> +static unsigned long k3_dwmmc_caps[4] = {
> +	MMC_CAP_4_BIT_DATA | MMC_CAP_SD_HIGHSPEED,
> +	MMC_CAP_8_BIT_DATA | MMC_CAP_MMC_HIGHSPEED,
> +	0,
> +	0,
> +};
> +
> +static const struct dw_mci_drv_data k3_drv_data = {
> +	.caps			= k3_dwmmc_caps,
> +	.set_ios		= dw_mci_k3_set_ios,
> +	.parse_dt		= dw_mci_k3_parse_dt,
> +};
> +
> +static const struct of_device_id dw_mci_k3_match[] = {
> +	{ .compatible = "hisilicon,hi4511-dw-mshc",
> +			.data = &k3_drv_data, },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, dw_mci_k3_match);
> +
> +static int dw_mci_k3_probe(struct platform_device *pdev)
> +{
> +	const struct dw_mci_drv_data *drv_data;
> +	const struct of_device_id *match;
> +
> +	match = of_match_node(dw_mci_k3_match, pdev->dev.of_node);
> +	drv_data = match->data;
> +
> +	return dw_mci_pltfm_register(pdev, drv_data);
> +}
> +
> +static int dw_mci_k3_suspend(struct device *dev)
> +{
> +	struct dw_mci *host = dev_get_drvdata(dev);
> +
> +	if (!IS_ERR(host->ciu_clk))
> +		clk_disable_unprepare(host->ciu_clk);
> +
> +	return dw_mci_suspend(host);
If k3 needs clk_disable here, dw_mci_suspend()is expected to be called prior to clk_disable_unprepare()?
Of course, it's ok at present though. 

Thanks,
Seungwon Jeon
> +}
> +
> +static int dw_mci_k3_resume(struct device *dev)
> +{
> +	struct dw_mci *host = dev_get_drvdata(dev);
> +	int ret = 0;
> +
> +	ret = clk_prepare_enable(host->ciu_clk);
> +	if (ret) {
> +		dev_err(host->dev, "failed to enable ciu clock\n");
> +		return ret;
> +	}
> +
> +	return dw_mci_resume(host);
> +}
> +
> +SIMPLE_DEV_PM_OPS(dw_mci_k3_pmops, dw_mci_k3_suspend, dw_mci_k3_resume);
> +
> +static struct platform_driver dw_mci_k3_pltfm_driver = {
> +	.probe		= dw_mci_k3_probe,
> +	.remove		= dw_mci_pltfm_remove,
> +	.driver		= {
> +		.name		= "dwmmc_k3",
> +		.of_match_table	= dw_mci_k3_match,
> +		.pm		= &dw_mci_k3_pmops,
> +	},
> +};
> +
> +module_platform_driver(dw_mci_k3_pltfm_driver);
> +
> +MODULE_DESCRIPTION("K3 Specific DW-MSHC Driver Extension");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:dwmmc-k3");
> --
> 1.7.9.5
> 
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