Date:	Thu, 31 Mar 2011 09:33:22 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Shawn Guo <shawn.guo@...aro.org>
Cc:	devicetree-discuss@...ts.ozlabs.org, linux-mmc@...r.kernel.org,
	patches@...aro.org, linaro-dev@...ts.linaro.org,
	linux-kernel@...r.kernel.org, sameo@...ux.intel.com
Subject: Re: [PATCH 1/5] mmc: sdhci: make sdhci-pltfm device drivers self
 registered

On Fri, Mar 25, 2011 at 04:48:47PM +0800, Shawn Guo wrote:
> The patch turns the common stuff in sdhci-pltfm.c into functions, and
> add device drivers their own .probe and .remove which in turn call
> into the common functions, so that those sdhci-pltfm device drivers
> register itself and keep all device specific things away from common
> sdhci-pltfm file.
> 
> Signed-off-by: Shawn Guo <shawn.guo@...aro.org>

Looks really good.  Relatively minor comments below, but you can add
this to the next version:

Reviewed-by: Grant Likely <grant.likely@...retlab.ca>

Thanks for doing this!
g.

> ---
>  drivers/mmc/host/Kconfig           |   24 +++--
>  drivers/mmc/host/Makefile          |   11 +-
>  drivers/mmc/host/sdhci-cns3xxx.c   |   67 +++++++++++++-
>  drivers/mmc/host/sdhci-dove.c      |   69 +++++++++++++-
>  drivers/mmc/host/sdhci-esdhc-imx.c |   97 +++++++++++++++----
>  drivers/mmc/host/sdhci-pltfm.c     |  165 ++-----------------------------
>  drivers/mmc/host/sdhci-pltfm.h     |   14 ++-
>  drivers/mmc/host/sdhci-tegra.c     |  187 +++++++++++++++++++++---------------
>  include/linux/mmc/sdhci-pltfm.h    |    6 -
>  9 files changed, 360 insertions(+), 280 deletions(-)
> 
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index afe8c6f..1db9347 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -113,20 +113,17 @@ config MMC_SDHCI_OF_HLWD
>  	  If unsure, say N.
>  
>  config MMC_SDHCI_PLTFM
> -	tristate "SDHCI support on the platform specific bus"
> +	bool
>  	depends on MMC_SDHCI
>  	help
> -	  This selects the platform specific bus support for Secure Digital Host
> -	  Controller Interface.
> -
> -	  If you have a controller with this interface, say Y or M here.
> -
> -	  If unsure, say N.
> +	  This selects the platform common function support for Secure Digital
> +	  Host Controller Interface.
>  
>  config MMC_SDHCI_CNS3XXX
>  	bool "SDHCI support on the Cavium Networks CNS3xxx SoC"
>  	depends on ARCH_CNS3XXX
> -	depends on MMC_SDHCI_PLTFM
> +	depends on MMC_SDHCI
> +	select MMC_SDHCI_PLTFM
>  	help
>  	  This selects the SDHCI support for CNS3xxx System-on-Chip devices.
>  
> @@ -134,7 +131,9 @@ config MMC_SDHCI_CNS3XXX
>  
>  config MMC_SDHCI_ESDHC_IMX
>  	bool "SDHCI platform support for the Freescale eSDHC i.MX controller"
> -	depends on MMC_SDHCI_PLTFM && (ARCH_MX25 || ARCH_MX35 || ARCH_MX5)
> +	depends on ARCH_MX25 || ARCH_MX35 || ARCH_MX5
> +	depends on MMC_SDHCI
> +	select MMC_SDHCI_PLTFM
>  	select MMC_SDHCI_IO_ACCESSORS
>  	help
>  	  This selects the Freescale eSDHC controller support on the platform
> @@ -145,7 +144,8 @@ config MMC_SDHCI_ESDHC_IMX
>  config MMC_SDHCI_DOVE
>  	bool "SDHCI support on Marvell's Dove SoC"
>  	depends on ARCH_DOVE
> -	depends on MMC_SDHCI_PLTFM
> +	depends on MMC_SDHCI
> +	select MMC_SDHCI_PLTFM
>  	select MMC_SDHCI_IO_ACCESSORS
>  	help
>  	  This selects the Secure Digital Host Controller Interface in
> @@ -155,7 +155,9 @@ config MMC_SDHCI_DOVE
>  
>  config MMC_SDHCI_TEGRA
>  	tristate "SDHCI platform support for the Tegra SD/MMC Controller"
> -	depends on MMC_SDHCI_PLTFM && ARCH_TEGRA
> +	depends on ARCH_TEGRA
> +	depends on MMC_SDHCI
> +	select MMC_SDHCI_PLTFM
>  	select MMC_SDHCI_IO_ACCESSORS
>  	help
>  	  This selects the Tegra SD/MMC controller. If you have a Tegra
> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> index e834fb2..1d8e43d 100644
> --- a/drivers/mmc/host/Makefile
> +++ b/drivers/mmc/host/Makefile
> @@ -36,12 +36,11 @@ obj-$(CONFIG_MMC_SH_MMCIF)	+= sh_mmcif.o
>  obj-$(CONFIG_MMC_JZ4740)	+= jz4740_mmc.o
>  obj-$(CONFIG_MMC_USHC)		+= ushc.o
>  
> -obj-$(CONFIG_MMC_SDHCI_PLTFM)			+= sdhci-platform.o
> -sdhci-platform-y				:= sdhci-pltfm.o
> -sdhci-platform-$(CONFIG_MMC_SDHCI_CNS3XXX)	+= sdhci-cns3xxx.o
> -sdhci-platform-$(CONFIG_MMC_SDHCI_ESDHC_IMX)	+= sdhci-esdhc-imx.o
> -sdhci-platform-$(CONFIG_MMC_SDHCI_DOVE)		+= sdhci-dove.o
> -sdhci-platform-$(CONFIG_MMC_SDHCI_TEGRA)	+= sdhci-tegra.o
> +obj-$(CONFIG_MMC_SDHCI_PLTFM)		+= sdhci-pltfm.o
> +obj-$(CONFIG_MMC_SDHCI_CNS3XXX)		+= sdhci-cns3xxx.o
> +obj-$(CONFIG_MMC_SDHCI_ESDHC_IMX)	+= sdhci-esdhc-imx.o
> +obj-$(CONFIG_MMC_SDHCI_DOVE)		+= sdhci-dove.o
> +obj-$(CONFIG_MMC_SDHCI_TEGRA)		+= sdhci-tegra.o
>  
>  obj-$(CONFIG_MMC_SDHCI_OF)	+= sdhci-of.o
>  sdhci-of-y				:= sdhci-of-core.o
> diff --git a/drivers/mmc/host/sdhci-cns3xxx.c b/drivers/mmc/host/sdhci-cns3xxx.c
> index 9ebd1d7..95b9080 100644
> --- a/drivers/mmc/host/sdhci-cns3xxx.c
> +++ b/drivers/mmc/host/sdhci-cns3xxx.c
> @@ -86,7 +86,7 @@ static struct sdhci_ops sdhci_cns3xxx_ops = {
>  	.set_clock	= sdhci_cns3xxx_set_clock,
>  };
>  
> -struct sdhci_pltfm_data sdhci_cns3xxx_pdata = {
> +static struct sdhci_pltfm_data sdhci_cns3xxx_pdata = {
>  	.ops = &sdhci_cns3xxx_ops,
>  	.quirks = SDHCI_QUIRK_BROKEN_DMA |
>  		  SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
> @@ -95,3 +95,68 @@ struct sdhci_pltfm_data sdhci_cns3xxx_pdata = {
>  		  SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
>  		  SDHCI_QUIRK_NONSTANDARD_CLOCK,
>  };
> +
> +static int __devinit sdhci_cns3xxx_probe(struct platform_device *pdev)
> +{
> +	struct sdhci_host *host;
> +	int ret;
> +
> +	host = sdhci_pltfm_init(pdev, &sdhci_cns3xxx_pdata);
> +	if (!host)
> +		return -ENOMEM;
> +
> +	ret = sdhci_add_host(host);
> +	if (ret)
> +		goto err_add_host;
> +
> +	return 0;
> +
> +err_add_host:
> +	sdhci_pltfm_free(pdev);
> +	return ret;
> +}

This pattern in this function is used by 2 drivers in this patch, and
2 more users (with the addition of an sdhci_get_of_property() call) in
the 3rd patch.  An sdchi_pltfm_register(pdev, &pdata) that does the
whole sequence would probably be valuable.  Same for the _remove hook.

Drivers that still need 2 stage registration, like the tegra driver,
would still be able to call sdhci_pltfm_init() and sdhci_add_host()
directly.

> +
> +static int __devexit sdhci_cns3xxx_remove(struct platform_device *pdev)
> +{
> +	struct sdhci_host *host = platform_get_drvdata(pdev);
> +	int dead = 0;
> +	u32 scratch;
> +
> +	scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
> +	if (scratch == (u32)-1)
> +		dead = 1;
> +
> +	sdhci_remove_host(host, dead);

The following would be equivalent to the above three lines:

	sdhci_remove_host(host, scratch == (u32)-1);

> +	sdhci_pltfm_free(pdev);
> +
> +	return 0;
> +}
> +
> +static struct platform_driver sdhci_cns3xxx_driver = {
> +	.driver		= {
> +		.name	= "sdhci-cns3xxx",
> +		.owner	= THIS_MODULE,
> +	},
> +	.probe		= sdhci_cns3xxx_probe,
> +	.remove		= __devexit_p(sdhci_cns3xxx_remove),
> +#ifdef CONFIG_PM
> +	.suspend	= sdhci_pltfm_suspend,
> +	.resume		= sdhci_pltfm_resume,
> +#endif
> +};
> +
> +static int __init sdhci_cns3xxx_init(void)
> +{
> +	return platform_driver_register(&sdhci_cns3xxx_driver);
> +}
> +module_init(sdhci_cns3xxx_init);
> +
> +static void __exit sdhci_cns3xxx_exit(void)
> +{
> +	platform_driver_unregister(&sdhci_cns3xxx_driver);
> +}
> +module_exit(sdhci_cns3xxx_exit);
> +
> +MODULE_DESCRIPTION("SDHCI driver for CNS3xxx");
> +MODULE_AUTHOR("Anton Vorontsov <avorontsov@...sta.com>");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/mmc/host/sdhci-dove.c b/drivers/mmc/host/sdhci-dove.c
> index 2aeef4f..6926d4a 100644
> --- a/drivers/mmc/host/sdhci-dove.c
> +++ b/drivers/mmc/host/sdhci-dove.c
> @@ -3,7 +3,7 @@
>   *
>   * Author: Saeed Bishara <saeed@...vell.com>
>   *	   Mike Rapoport <mike@...pulab.co.il>
> - * Based on sdhci-cns3xxx.c
> + * Based on sdhci-dove.c

This file *is* sdhci-dove.c.  Did you intend this change?  :-)

>   *
>   * This program is free software; you can redistribute it and/or modify
>   * it under the terms of the GNU General Public License version 2 as
> @@ -61,10 +61,75 @@ static struct sdhci_ops sdhci_dove_ops = {
>  	.read_l	= sdhci_dove_readl,
>  };
>  
> -struct sdhci_pltfm_data sdhci_dove_pdata = {
> +static struct sdhci_pltfm_data sdhci_dove_pdata = {
>  	.ops	= &sdhci_dove_ops,
>  	.quirks	= SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER |
>  		  SDHCI_QUIRK_NO_BUSY_IRQ |
>  		  SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
>  		  SDHCI_QUIRK_FORCE_DMA,
>  };
> +
> +static int __devinit sdhci_dove_probe(struct platform_device *pdev)
> +{
> +	struct sdhci_host *host;
> +	int ret;
> +
> +	host = sdhci_pltfm_init(pdev, &sdhci_dove_pdata);
> +	if (!host)
> +		return -ENOMEM;
> +
> +	ret = sdhci_add_host(host);
> +	if (ret)
> +		goto err_add_host;
> +
> +	return 0;
> +
> +err_add_host:
> +	sdhci_pltfm_free(pdev);
> +	return ret;
> +}
> +
> +static int __devexit sdhci_dove_remove(struct platform_device *pdev)
> +{
> +	struct sdhci_host *host = platform_get_drvdata(pdev);
> +	int dead = 0;
> +	u32 scratch;
> +
> +	scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
> +	if (scratch == (u32)-1)
> +		dead = 1;
> +
> +	sdhci_remove_host(host, dead);
> +	sdhci_pltfm_free(pdev);
> +
> +	return 0;
> +}
> +
> +static struct platform_driver sdhci_dove_driver = {
> +	.driver		= {
> +		.name	= "sdhci-dove",
> +		.owner	= THIS_MODULE,
> +	},
> +	.probe		= sdhci_dove_probe,
> +	.remove		= __devexit_p(sdhci_dove_remove),
> +#ifdef CONFIG_PM
> +	.suspend	= sdhci_pltfm_suspend,
> +	.resume		= sdhci_pltfm_resume,
> +#endif
> +};
> +
> +static int __init sdhci_dove_init(void)
> +{
> +	return platform_driver_register(&sdhci_dove_driver);
> +}
> +module_init(sdhci_dove_init);
> +
> +static void __exit sdhci_dove_exit(void)
> +{
> +	platform_driver_unregister(&sdhci_dove_driver);
> +}
> +module_exit(sdhci_dove_exit);
> +
> +MODULE_DESCRIPTION("SDHCI driver for Dove");
> +MODULE_AUTHOR("Saeed Bishara <saeed@...vell.com>");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
> index 9b82910..c9eb507 100644
> --- a/drivers/mmc/host/sdhci-esdhc-imx.c
> +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
> @@ -100,15 +100,39 @@ static unsigned int esdhc_pltfm_get_min_clock(struct sdhci_host *host)
>  	return clk_get_rate(pltfm_host->clk) / 256 / 16;
>  }
>  
> -static int esdhc_pltfm_init(struct sdhci_host *host, struct sdhci_pltfm_data *pdata)
> +static struct sdhci_ops sdhci_esdhc_ops = {
> +	.read_w = esdhc_readw_le,
> +	.write_w = esdhc_writew_le,
> +	.write_b = esdhc_writeb_le,
> +	.set_clock = esdhc_set_clock,
> +	.get_max_clock = esdhc_pltfm_get_max_clock,
> +	.get_min_clock = esdhc_pltfm_get_min_clock,
> +};
> +
> +static struct sdhci_pltfm_data sdhci_esdhc_imx_pdata = {
> +	.quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_BROKEN_ADMA,
> +	/* ADMA has issues. Might be fixable */
> +	.ops = &sdhci_esdhc_ops,
> +};
> +
> +static int __devinit sdhci_esdhc_imx_probe(struct platform_device *pdev)
>  {
> -	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct sdhci_pltfm_host *pltfm_host;
> +	struct sdhci_host *host;
>  	struct clk *clk;
> +	int ret;
> +
> +	host = sdhci_pltfm_init(pdev, &sdhci_esdhc_imx_pdata);
> +	if (!host)
> +		return -ENOMEM;
> +
> +	pltfm_host = sdhci_priv(host);
>  
>  	clk = clk_get(mmc_dev(host->mmc), NULL);
>  	if (IS_ERR(clk)) {
>  		dev_err(mmc_dev(host->mmc), "clk err\n");
> -		return PTR_ERR(clk);
> +		ret = PTR_ERR(clk);
> +		goto err_clk_get;
>  	}
>  	clk_enable(clk);
>  	pltfm_host->clk = clk;
> @@ -120,30 +144,67 @@ static int esdhc_pltfm_init(struct sdhci_host *host, struct sdhci_pltfm_data *pd
>  	if (cpu_is_mx25() || cpu_is_mx35())
>  		host->quirks |= SDHCI_QUIRK_NO_MULTIBLOCK;
>  
> +	ret = sdhci_add_host(host);
> +	if (ret)
> +		goto err_add_host;
> +
>  	return 0;
> +
> +err_add_host:
> +	clk_disable(pltfm_host->clk);
> +	clk_put(pltfm_host->clk);
> +err_clk_get:
> +	sdhci_pltfm_free(pdev);
> +	return ret;
>  }
>  
> -static void esdhc_pltfm_exit(struct sdhci_host *host)
> +static int __devexit sdhci_esdhc_imx_remove(struct platform_device *pdev)
>  {
> +	struct sdhci_host *host = platform_get_drvdata(pdev);
>  	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	int dead = 0;
> +	u32 scratch;
> +
> +	scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
> +	if (scratch == (u32)-1)
> +		dead = 1;
> +
> +	sdhci_remove_host(host, dead);
>  
>  	clk_disable(pltfm_host->clk);
>  	clk_put(pltfm_host->clk);
> +
> +	sdhci_pltfm_free(pdev);
> +
> +	return 0;
>  }
>  
> -static struct sdhci_ops sdhci_esdhc_ops = {
> -	.read_w = esdhc_readw_le,
> -	.write_w = esdhc_writew_le,
> -	.write_b = esdhc_writeb_le,
> -	.set_clock = esdhc_set_clock,
> -	.get_max_clock = esdhc_pltfm_get_max_clock,
> -	.get_min_clock = esdhc_pltfm_get_min_clock,
> +static struct platform_driver sdhci_esdhc_imx_driver = {
> +	.driver		= {
> +		.name	= "sdhci-esdhc-imx",
> +		.owner	= THIS_MODULE,
> +	},
> +	.probe		= sdhci_esdhc_imx_probe,
> +	.remove		= __devexit_p(sdhci_esdhc_imx_remove),
> +#ifdef CONFIG_PM
> +	.suspend	= sdhci_pltfm_suspend,
> +	.resume		= sdhci_pltfm_resume,
> +#endif
>  };
>  
> -struct sdhci_pltfm_data sdhci_esdhc_imx_pdata = {
> -	.quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_BROKEN_ADMA,
> -	/* ADMA has issues. Might be fixable */
> -	.ops = &sdhci_esdhc_ops,
> -	.init = esdhc_pltfm_init,
> -	.exit = esdhc_pltfm_exit,
> -};
> +static int __init sdhci_esdhc_imx_init(void)
> +{
> +	return platform_driver_register(&sdhci_esdhc_imx_driver);
> +}
> +
> +static void __exit sdhci_esdhc_imx_exit(void)
> +{
> +	platform_driver_unregister(&sdhci_esdhc_imx_driver);
> +}
> +
> +module_init(sdhci_esdhc_imx_init);
> +module_exit(sdhci_esdhc_imx_exit);

Please move the module_init() line to be directly below the
sdchi_esdhc_imx_init() implementation.

> +
> +MODULE_DESCRIPTION("SDHCI driver for i.MX eSDHC");
> +MODULE_AUTHOR("Wolfram Sang <w.sang@...gutronix.de>");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/mmc/host/sdhci-pltfm.c b/drivers/mmc/host/sdhci-pltfm.c
> index ccc04ac..63e45aa 100644
> --- a/drivers/mmc/host/sdhci-pltfm.c
> +++ b/drivers/mmc/host/sdhci-pltfm.c
> @@ -22,70 +22,22 @@
>   * Inspired by sdhci-pci.c, by Pierre Ossman
>   */
>  
> -#include <linux/delay.h>
> -#include <linux/highmem.h>
> -#include <linux/mod_devicetable.h>
> -#include <linux/platform_device.h>
> -
> -#include <linux/mmc/host.h>
> -
> -#include <linux/io.h>
> -#include <linux/mmc/sdhci-pltfm.h>
> +#include <linux/err.h>
>  
>  #include "sdhci.h"
>  #include "sdhci-pltfm.h"
>  
> -/*****************************************************************************\
> - *                                                                           *
> - * SDHCI core callbacks                                                      *
> - *                                                                           *
> -\*****************************************************************************/
> -
>  static struct sdhci_ops sdhci_pltfm_ops = {
>  };
>  
> -/*****************************************************************************\
> - *                                                                           *
> - * Device probing/removal                                                    *
> - *                                                                           *
> -\*****************************************************************************/
> -#if defined(CONFIG_OF)
> -#include <linux/of_device.h>
> -static const struct of_device_id sdhci_dt_ids[] = {
> -	{ .compatible = "nvidia,tegra250-sdhci", .data = &sdhci_tegra_dt_pdata },
> -	{ }
> -};
> -MODULE_DEVICE_TABLE(platform, sdhci_dt_ids);
> -
> -static const struct of_device_id *sdhci_get_of_device_id(struct platform_device *pdev)
> -{
> -	return of_match_device(sdhci_dt_ids, &pdev->dev);
> -}
> -#else
> -#define shdci_dt_ids NULL
> -static inline struct of_device_id *sdhci_get_of_device_id(struct platform_device *pdev)
> -{
> -	return NULL;
> -}
> -#endif
> -
> -static int __devinit sdhci_pltfm_probe(struct platform_device *pdev)
> +struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
> +				    struct sdhci_pltfm_data *pdata)
>  {
> -	const struct platform_device_id *platid = platform_get_device_id(pdev);
> -	const struct of_device_id *dtid = sdhci_get_of_device_id(pdev);
> -	struct sdhci_pltfm_data *pdata;
>  	struct sdhci_host *host;
>  	struct sdhci_pltfm_host *pltfm_host;
>  	struct resource *iomem;
>  	int ret;
>  
> -	if (platid && platid->driver_data)
> -		pdata = (void *)platid->driver_data;
> -	else if (dtid && dtid->data)
> -		pdata = dtid->data;
> -	else
> -		pdata = pdev->dev.platform_data;
> -
>  	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	if (!iomem) {
>  		ret = -ENOMEM;
> @@ -93,8 +45,7 @@ static int __devinit sdhci_pltfm_probe(struct platform_device *pdev)
>  	}
>  
>  	if (resource_size(iomem) < 0x100)
> -		dev_err(&pdev->dev, "Invalid iomem size. You may "
> -			"experience problems.\n");
> +		dev_err(&pdev->dev, "Invalid iomem size!\n");
>  
>  	/* Some PCI-based MFD need the parent here */
>  	if (pdev->dev.parent != &platform_bus)
> @@ -109,7 +60,7 @@ static int __devinit sdhci_pltfm_probe(struct platform_device *pdev)
>  
>  	pltfm_host = sdhci_priv(host);
>  
> -	host->hw_name = "platform";
> +	host->hw_name = dev_name(&pdev->dev);
>  	if (pdata && pdata->ops)
>  		host->ops = pdata->ops;
>  	else
> @@ -132,136 +83,42 @@ static int __devinit sdhci_pltfm_probe(struct platform_device *pdev)
>  		goto err_remap;
>  	}
>  
> -	if (pdata && pdata->init) {
> -		ret = pdata->init(host, pdata);
> -		if (ret)
> -			goto err_plat_init;
> -	}
> -
> -	ret = sdhci_add_host(host);
> -	if (ret)
> -		goto err_add_host;
> -
>  	platform_set_drvdata(pdev, host);
>  
> -	return 0;
> +	return host;
>  
> -err_add_host:
> -	if (pdata && pdata->exit)
> -		pdata->exit(host);
> -err_plat_init:
> -	iounmap(host->ioaddr);
>  err_remap:
>  	release_mem_region(iomem->start, resource_size(iomem));
>  err_request:
>  	sdhci_free_host(host);
>  err:
> -	printk(KERN_ERR"Probing of sdhci-pltfm failed: %d\n", ret);
> -	return ret;
> +	pr_err("%s failed %d\n", __func__, ret);
> +	return NULL;
>  }
>  
> -static int __devexit sdhci_pltfm_remove(struct platform_device *pdev)
> +void sdhci_pltfm_free(struct platform_device *pdev)
>  {
> -	const struct platform_device_id *platid = platform_get_device_id(pdev);
> -	const struct of_device_id *dtid = sdhci_get_of_device_id(pdev);
> -	struct sdhci_pltfm_data *pdata;
>  	struct sdhci_host *host = platform_get_drvdata(pdev);
>  	struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	int dead;
> -	u32 scratch;
>  
> -	if (platid && platid->driver_data)
> -		pdata = (void *)platid->driver_data;
> -	else if (dtid && dtid->data)
> -		pdata = dtid->data;
> -	else
> -		pdata = pdev->dev.platform_data;
> -
> -	dead = 0;
> -	scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
> -	if (scratch == (u32)-1)
> -		dead = 1;
> -
> -	sdhci_remove_host(host, dead);
> -	if (pdata && pdata->exit)
> -		pdata->exit(host);
>  	iounmap(host->ioaddr);
>  	release_mem_region(iomem->start, resource_size(iomem));
>  	sdhci_free_host(host);
>  	platform_set_drvdata(pdev, NULL);
> -
> -	return 0;
>  }
>  
> -static const struct platform_device_id sdhci_pltfm_ids[] = {
> -	{ "sdhci", },
> -#ifdef CONFIG_MMC_SDHCI_CNS3XXX
> -	{ "sdhci-cns3xxx", (kernel_ulong_t)&sdhci_cns3xxx_pdata },
> -#endif
> -#ifdef CONFIG_MMC_SDHCI_ESDHC_IMX
> -	{ "sdhci-esdhc-imx", (kernel_ulong_t)&sdhci_esdhc_imx_pdata },
> -#endif
> -#ifdef CONFIG_MMC_SDHCI_DOVE
> -	{ "sdhci-dove", (kernel_ulong_t)&sdhci_dove_pdata },
> -#endif
> -#ifdef CONFIG_MMC_SDHCI_TEGRA
> -	{ "sdhci-tegra", (kernel_ulong_t)&sdhci_tegra_pdata },
> -#endif
> -	{ },
> -};
> -MODULE_DEVICE_TABLE(platform, sdhci_pltfm_ids);
> -
>  #ifdef CONFIG_PM
> -static int sdhci_pltfm_suspend(struct platform_device *dev, pm_message_t state)
> +int sdhci_pltfm_suspend(struct platform_device *dev, pm_message_t state)
>  {
>  	struct sdhci_host *host = platform_get_drvdata(dev);
>  
>  	return sdhci_suspend_host(host, state);
>  }
>  
> -static int sdhci_pltfm_resume(struct platform_device *dev)
> +int sdhci_pltfm_resume(struct platform_device *dev)
>  {
>  	struct sdhci_host *host = platform_get_drvdata(dev);
>  
>  	return sdhci_resume_host(host);
>  }
> -#else
> -#define sdhci_pltfm_suspend	NULL
> -#define sdhci_pltfm_resume	NULL
>  #endif	/* CONFIG_PM */
> -
> -static struct platform_driver sdhci_pltfm_driver = {
> -	.driver = {
> -		.name	= "sdhci",
> -		.owner	= THIS_MODULE,
> -		.of_match_table = sdhci_dt_ids,
> -	},
> -	.probe		= sdhci_pltfm_probe,
> -	.remove		= __devexit_p(sdhci_pltfm_remove),
> -	.id_table	= sdhci_pltfm_ids,
> -	.suspend	= sdhci_pltfm_suspend,
> -	.resume		= sdhci_pltfm_resume,
> -};
> -
> -/*****************************************************************************\
> - *                                                                           *
> - * Driver init/exit                                                          *
> - *                                                                           *
> -\*****************************************************************************/
> -
> -static int __init sdhci_drv_init(void)
> -{
> -	return platform_driver_register(&sdhci_pltfm_driver);
> -}
> -
> -static void __exit sdhci_drv_exit(void)
> -{
> -	platform_driver_unregister(&sdhci_pltfm_driver);
> -}
> -
> -module_init(sdhci_drv_init);
> -module_exit(sdhci_drv_exit);
> -
> -MODULE_DESCRIPTION("Secure Digital Host Controller Interface platform driver");
> -MODULE_AUTHOR("Mocean Laboratories <info@...ean-labs.com>");
> -MODULE_LICENSE("GPL v2");
> diff --git a/drivers/mmc/host/sdhci-pltfm.h b/drivers/mmc/host/sdhci-pltfm.h
> index c67523d..a3e4be0 100644
> --- a/drivers/mmc/host/sdhci-pltfm.h
> +++ b/drivers/mmc/host/sdhci-pltfm.h
> @@ -13,6 +13,7 @@
>  
>  #include <linux/clk.h>
>  #include <linux/types.h>
> +#include <linux/platform_device.h>
>  #include <linux/mmc/sdhci-pltfm.h>
>  
>  struct sdhci_pltfm_host {
> @@ -20,10 +21,13 @@ struct sdhci_pltfm_host {
>  	u32 scratchpad; /* to handle quirks across io-accessor calls */
>  };
>  
> -extern struct sdhci_pltfm_data sdhci_cns3xxx_pdata;
> -extern struct sdhci_pltfm_data sdhci_esdhc_imx_pdata;
> -extern struct sdhci_pltfm_data sdhci_dove_pdata;
> -extern struct sdhci_pltfm_data sdhci_tegra_pdata;
> -extern struct sdhci_pltfm_data sdhci_tegra_dt_pdata;
> +extern struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
> +					   struct sdhci_pltfm_data *pdata);
> +extern void sdhci_pltfm_free(struct platform_device *pdev);
> +
> +#ifdef CONFIG_PM
> +extern int sdhci_pltfm_suspend(struct platform_device *dev, pm_message_t state);
> +extern int sdhci_pltfm_resume(struct platform_device *dev);
> +#endif
>  
>  #endif /* _DRIVERS_MMC_SDHCI_PLTFM_H */
> diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
> index c3d6f83..cfcd521 100644
> --- a/drivers/mmc/host/sdhci-tegra.c
> +++ b/drivers/mmc/host/sdhci-tegra.c
> @@ -119,19 +119,58 @@ static int tegra_sdhci_8bit(struct sdhci_host *host, int bus_width)
>  }
>  
>  
> -static int tegra_sdhci_pltfm_init(struct sdhci_host *host,
> -				  struct sdhci_pltfm_data *pdata)
> +static struct sdhci_ops tegra_sdhci_ops = {
> +	.get_ro     = tegra_sdhci_get_ro,
> +	.read_l     = tegra_sdhci_readl,
> +	.read_w     = tegra_sdhci_readw,
> +	.write_l    = tegra_sdhci_writel,
> +	.platform_8bit_width = tegra_sdhci_8bit,
> +};
> +
> +static struct sdhci_pltfm_data sdhci_tegra_pdata = {
> +	.quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
> +		  SDHCI_QUIRK_SINGLE_POWER_WRITE |
> +		  SDHCI_QUIRK_NO_HISPD_BIT |
> +		  SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
> +	.ops  = &tegra_sdhci_ops,
> +};
> +
> +static int __devinit sdhci_tegra_probe(struct platform_device *pdev)
>  {
> -	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> -	struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
> +	struct sdhci_pltfm_host *pltfm_host;
>  	struct tegra_sdhci_platform_data *plat;
> +	struct sdhci_host *host;
>  	struct clk *clk;
>  	int rc;
>  
> +	host = sdhci_pltfm_init(pdev, &sdhci_tegra_pdata);
> +	if (!host)
> +		return -ENOMEM;
> +
> +	pltfm_host = sdhci_priv(host);
> +
>  	plat = pdev->dev.platform_data;
> +
> +#ifdef CONFIG_OF
> +	plat = kzalloc(sizeof(*plat), GFP_KERNEL);
> +	if (!plat) {
> +		rc = -ENOMEM;
> +		goto err_no_plat;
> +	}
> +	pdev->dev.platform_data = plat;
> +
> +	plat->cd_gpio = of_get_gpio(pdev->dev.of_node, 0);
> +	plat->wp_gpio = of_get_gpio(pdev->dev.of_node, 1);
> +	plat->power_gpio = of_get_gpio(pdev->dev.of_node, 2);
> +
> +	dev_info(&pdev->dev, "using gpios cd=%i, wp=%i power=%i\n",
> +		plat->cd_gpio, plat->wp_gpio, plat->power_gpio);
> +#endif

This will need to be reworked for mainline since the Tegra device tree
support only exists in my git tree.  Basing it on devicetree/arm would
work.

> +
>  	if (plat == NULL) {
>  		dev_err(mmc_dev(host->mmc), "missing platform data\n");
> -		return -ENXIO;
> +		rc = -ENXIO;
> +		goto err_no_plat;
>  	}
>  
>  	if (gpio_is_valid(plat->power_gpio)) {
> @@ -139,7 +178,7 @@ static int tegra_sdhci_pltfm_init(struct sdhci_host *host,
>  		if (rc) {
>  			dev_err(mmc_dev(host->mmc),
>  				"failed to allocate power gpio\n");
> -			goto out;
> +			goto err_power_req;
>  		}
>  		tegra_gpio_enable(plat->power_gpio);
>  		gpio_direction_output(plat->power_gpio, 1);
> @@ -150,7 +189,7 @@ static int tegra_sdhci_pltfm_init(struct sdhci_host *host,
>  		if (rc) {
>  			dev_err(mmc_dev(host->mmc),
>  				"failed to allocate cd gpio\n");
> -			goto out_power;
> +			goto err_cd_req;
>  		}
>  		tegra_gpio_enable(plat->cd_gpio);
>  		gpio_direction_input(plat->cd_gpio);
> @@ -161,7 +200,7 @@ static int tegra_sdhci_pltfm_init(struct sdhci_host *host,
>  
>  		if (rc)	{
>  			dev_err(mmc_dev(host->mmc), "request irq error\n");
> -			goto out_cd;
> +			goto err_cd_irq_req;
>  		}
>  
>  	}
> @@ -171,7 +210,7 @@ static int tegra_sdhci_pltfm_init(struct sdhci_host *host,
>  		if (rc) {
>  			dev_err(mmc_dev(host->mmc),
>  				"failed to allocate wp gpio\n");
> -			goto out_cd;
> +			goto err_wp_req;
>  		}
>  		tegra_gpio_enable(plat->wp_gpio);
>  		gpio_direction_input(plat->wp_gpio);
> @@ -181,7 +220,7 @@ static int tegra_sdhci_pltfm_init(struct sdhci_host *host,
>  	if (IS_ERR(clk)) {
>  		dev_err(mmc_dev(host->mmc), "clk err\n");
>  		rc = PTR_ERR(clk);
> -		goto out_wp;
> +		goto err_clk_get;
>  	}
>  	clk_enable(clk);
>  	pltfm_host->clk = clk;
> @@ -189,62 +228,56 @@ static int tegra_sdhci_pltfm_init(struct sdhci_host *host,
>  	if (plat->is_8bit)
>  		host->mmc->caps |= MMC_CAP_8_BIT_DATA;
>  
> +	rc = sdhci_add_host(host);
> +	if (rc)
> +		goto err_add_host;
> +
>  	return 0;
>  
> -out_wp:
> +err_add_host:
> +	clk_disable(pltfm_host->clk);
> +	clk_put(pltfm_host->clk);
> +err_clk_get:
>  	if (gpio_is_valid(plat->wp_gpio)) {
>  		tegra_gpio_disable(plat->wp_gpio);
>  		gpio_free(plat->wp_gpio);
>  	}
> -
> -out_cd:
> +err_wp_req:
> +	if (gpio_is_valid(plat->cd_gpio)) {
> +		free_irq(gpio_to_irq(plat->cd_gpio), host);
> +	}
> +err_cd_irq_req:
>  	if (gpio_is_valid(plat->cd_gpio)) {
>  		tegra_gpio_disable(plat->cd_gpio);
>  		gpio_free(plat->cd_gpio);
>  	}
> -
> -out_power:
> +err_cd_req:
>  	if (gpio_is_valid(plat->power_gpio)) {
>  		tegra_gpio_disable(plat->power_gpio);
>  		gpio_free(plat->power_gpio);
>  	}
> -
> -out:
> +err_power_req:
> +#ifdef CONFIG_OF
> +	kfree(plat);
> +#endif
> +err_no_plat:
> +	sdhci_pltfm_free(pdev);
>  	return rc;
>  }
>  
> -static int tegra_sdhci_pltfm_dt_init(struct sdhci_host *host,
> -				     struct sdhci_pltfm_data *pdata)
> +static int __devexit sdhci_tegra_remove(struct platform_device *pdev)
>  {
> -	struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
> +	struct sdhci_host *host = platform_get_drvdata(pdev);
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>  	struct tegra_sdhci_platform_data *plat;
> +	int dead = 0;
> +	u32 scratch;
>  
> -	if (pdev->dev.platform_data) {
> -		dev_err(&pdev->dev, "%s: platform_data not NULL; aborting\n",
> -			__func__);
> -		return -ENODEV;
> -	}
> +	scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
> +	if (scratch == (u32)-1)
> +		dead = 1;
>  
> -	plat = kzalloc(sizeof(*plat), GFP_KERNEL);
> -	if (!plat)
> -		return -ENOMEM;
> -	pdev->dev.platform_data = plat;
> -
> -	plat->cd_gpio = of_get_gpio(pdev->dev.of_node, 0);
> -	plat->wp_gpio = of_get_gpio(pdev->dev.of_node, 1);
> -	plat->power_gpio = of_get_gpio(pdev->dev.of_node, 2);
> -
> -	dev_info(&pdev->dev, "using gpios cd=%i, wp=%i power=%i\n",
> -		plat->cd_gpio, plat->wp_gpio, plat->power_gpio);
> -
> -	return tegra_sdhci_pltfm_init(host, pdata);
> -}
> -
> -static void tegra_sdhci_pltfm_exit(struct sdhci_host *host)
> -{
> -	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> -	struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
> -	struct tegra_sdhci_platform_data *plat;
> +	sdhci_remove_host(host, dead);
>  
>  	plat = pdev->dev.platform_data;
>  
> @@ -263,44 +296,44 @@ static void tegra_sdhci_pltfm_exit(struct sdhci_host *host)
>  		gpio_free(plat->power_gpio);
>  	}
>  
> +#ifdef CONFIG_OF
> +	kfree(pdev->dev.platform_data);
> +	pdev->dev.platform_data = NULL;
> +#endif
> +
>  	clk_disable(pltfm_host->clk);
>  	clk_put(pltfm_host->clk);
> -}
>  
> -static void tegra_sdhci_pltfm_dt_exit(struct sdhci_host *host)
> -{
> -	struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
> -
> -	tegra_sdhci_pltfm_exit(host);
> +	sdhci_pltfm_free(pdev);
>  
> -	kfree(pdev->dev.platform_data);
> -	pdev->dev.platform_data = NULL;
> +	return 0;
>  }
>  
> -static struct sdhci_ops tegra_sdhci_ops = {
> -	.get_ro     = tegra_sdhci_get_ro,
> -	.read_l     = tegra_sdhci_readl,
> -	.read_w     = tegra_sdhci_readw,
> -	.write_l    = tegra_sdhci_writel,
> -	.platform_8bit_width = tegra_sdhci_8bit,
> +static struct platform_driver sdhci_tegra_driver = {
> +	.driver		= {
> +		.name	= "sdhci-tegra",
> +		.owner	= THIS_MODULE,
> +	},
> +	.probe		= sdhci_tegra_probe,
> +	.remove		= __devexit_p(sdhci_tegra_remove),
> +#ifdef CONFIG_PM
> +	.suspend	= sdhci_pltfm_suspend,
> +	.resume		= sdhci_pltfm_resume,
> +#endif
>  };
>  
> -struct sdhci_pltfm_data sdhci_tegra_pdata = {
> -	.quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
> -		  SDHCI_QUIRK_SINGLE_POWER_WRITE |
> -		  SDHCI_QUIRK_NO_HISPD_BIT |
> -		  SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
> -	.ops  = &tegra_sdhci_ops,
> -	.init = tegra_sdhci_pltfm_init,
> -	.exit = tegra_sdhci_pltfm_exit,
> -};
> +static int __init sdhci_tegra_init(void)
> +{
> +	return platform_driver_register(&sdhci_tegra_driver);
> +}
> +module_init(sdhci_tegra_init);
>  
> -struct sdhci_pltfm_data sdhci_tegra_dt_pdata = {
> -	.quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
> -		  SDHCI_QUIRK_SINGLE_POWER_WRITE |
> -		  SDHCI_QUIRK_NO_HISPD_BIT |
> -		  SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
> -	.ops  = &tegra_sdhci_ops,
> -	.init = tegra_sdhci_pltfm_dt_init,
> -	.exit = tegra_sdhci_pltfm_dt_exit,
> -};
> +static void __exit sdhci_tegra_exit(void)
> +{
> +	platform_driver_unregister(&sdhci_tegra_driver);
> +}
> +module_exit(sdhci_tegra_exit);
> +
> +MODULE_DESCRIPTION("SDHCI driver for Tegra");
> +MODULE_AUTHOR(" Google, Inc.");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/mmc/sdhci-pltfm.h b/include/linux/mmc/sdhci-pltfm.h
> index 548d59d..f1c2ac3 100644
> --- a/include/linux/mmc/sdhci-pltfm.h
> +++ b/include/linux/mmc/sdhci-pltfm.h
> @@ -15,21 +15,15 @@
>  #define _SDHCI_PLTFM_H
>  
>  struct sdhci_ops;
> -struct sdhci_host;
>  
>  /**
>   * struct sdhci_pltfm_data - SDHCI platform-specific information & hooks
>   * @ops: optional pointer to the platform-provided SDHCI ops
>   * @quirks: optional SDHCI quirks
> - * @init: optional hook that is called during device probe, before the
> - *        driver tries to access any SDHCI registers
> - * @exit: optional hook that is called during device removal
>   */
>  struct sdhci_pltfm_data {
>  	struct sdhci_ops *ops;
>  	unsigned int quirks;
> -	int (*init)(struct sdhci_host *host, struct sdhci_pltfm_data *pdata);
> -	void (*exit)(struct sdhci_host *host);
>  };
>  
>  #endif /* _SDHCI_PLTFM_H */
> -- 
> 1.7.1
> 
> 
> _______________________________________________
> linaro-dev mailing list
> linaro-dev@...ts.linaro.org
> http://lists.linaro.org/mailman/listinfo/linaro-dev
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