[PATCH 1/2] mmc: make sdhci work with ricoh mmc controller

[Stefan Bader]

On 02/11/2011 11:55 PM, Manoj Iyer wrote:
> From: Maxim Levitsky <maximlevitsky at gmail.com>
> 
> The current way of disabling it is not well tested by vendor and has all
> kinds of bugs that show up on resume from ram/disk.  A very good example
> is a dead SDHCI controller.
> 
> Old way of disabling is still supported by continuing to use
> CONFIG_MMC_RICOH_MMC.
> 
> Based on 'http://list.drzeus.cx/pipermail/sdhci-devel/2007-December/002085.html'
> Therefore most of the credit for this goes to Andrew de Quincey
> 
> BugLink: http://launchpad.net/bugs/717435
> 
> Signed-off-by: Maxim Levitsky <maximlevitsky at gmail.com>
> Cc: Andrew de Quincey <adq_dvb at lidskialf.net>
> Acked-by: Philip Langdale <philipl at overt.org>
> Cc: "Rafael J. Wysocki" <rjw at sisk.pl>
> Cc: <linux-mmc at vger.kernel.org>
> Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
> Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
> (cherry picked from commit ccc92c23240cdf952ef7cc39ba563910dcbc9cbe)
> 
> Signed-off-by: Manoj Iyer <manoj.iyer at canonical.com>

I suspect this could be rather seen as adding feature and by that not make it
into longterm support (has it been tried)? But it is at least well contained to
affect only the one pci id.

Acked-by: Stefan Bader <stefan.bader at canonical.com>

Note that Maverick will soon reach the stage where this kind of change will not
qualify for SRU anymore.

> ---
>  drivers/mmc/host/sdhci-pci.c |   41 +++++++++++++++++++++++++++++++++++++++++
>  drivers/mmc/host/sdhci.c     |    3 ++-
>  drivers/mmc/host/sdhci.h     |    4 ++++
>  3 files changed, 47 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-pci.c b/drivers/mmc/host/sdhci-pci.c
> index 65483fd..e021431 100644
> --- a/drivers/mmc/host/sdhci-pci.c
> +++ b/drivers/mmc/host/sdhci-pci.c
> @@ -17,6 +17,7 @@
>  #include <linux/pci.h>
>  #include <linux/dma-mapping.h>
>  #include <linux/slab.h>
> +#include <linux/device.h>
>  
>  #include <linux/mmc/host.h>
>  
> @@ -84,7 +85,30 @@ static int ricoh_probe(struct sdhci_pci_chip *chip)
>  	if (chip->pdev->subsystem_vendor == PCI_VENDOR_ID_SAMSUNG ||
>  	    chip->pdev->subsystem_vendor == PCI_VENDOR_ID_SONY)
>  		chip->quirks |= SDHCI_QUIRK_NO_CARD_NO_RESET;
> +	return 0;
> +}
> +
> +static int ricoh_mmc_probe_slot(struct sdhci_pci_slot *slot)
> +{
> +	slot->host->caps =
> +		((0x21 << SDHCI_TIMEOUT_CLK_SHIFT)
> +			& SDHCI_TIMEOUT_CLK_MASK) |
> +
> +		((0x21 << SDHCI_CLOCK_BASE_SHIFT)
> +			& SDHCI_CLOCK_BASE_MASK) |
>  
> +		SDHCI_TIMEOUT_CLK_UNIT |
> +		SDHCI_CAN_VDD_330 |
> +		SDHCI_CAN_DO_SDMA;
> +	return 0;
> +}
> +
> +static int ricoh_mmc_resume(struct sdhci_pci_chip *chip)
> +{
> +	/* Apply a delay to allow controller to settle */
> +	/* Otherwise it becomes confused if card state changed
> +		during suspend */
> +	msleep(500);
>  	return 0;
>  }
>  
> @@ -95,6 +119,15 @@ static const struct sdhci_pci_fixes sdhci_ricoh = {
>  			  SDHCI_QUIRK_CLOCK_BEFORE_RESET,
>  };
>  
> +static const struct sdhci_pci_fixes sdhci_ricoh_mmc = {
> +	.probe_slot	= ricoh_mmc_probe_slot,
> +	.resume		= ricoh_mmc_resume,
> +	.quirks		= SDHCI_QUIRK_32BIT_DMA_ADDR |
> +			  SDHCI_QUIRK_CLOCK_BEFORE_RESET |
> +			  SDHCI_QUIRK_NO_CARD_NO_RESET |
> +			  SDHCI_QUIRK_MISSING_CAPS
> +};
> +
>  static const struct sdhci_pci_fixes sdhci_ene_712 = {
>  	.quirks		= SDHCI_QUIRK_SINGLE_POWER_WRITE |
>  			  SDHCI_QUIRK_BROKEN_DMA,
> @@ -374,6 +407,14 @@ static const struct pci_device_id pci_ids[] __devinitdata = {
>  	},
>  
>  	{
> +		.vendor         = PCI_VENDOR_ID_RICOH,
> +		.device         = 0x843,
> +		.subvendor      = PCI_ANY_ID,
> +		.subdevice      = PCI_ANY_ID,
> +		.driver_data    = (kernel_ulong_t)&sdhci_ricoh_mmc,
> +	},
> +
> +	{
>  		.vendor		= PCI_VENDOR_ID_ENE,
>  		.device		= PCI_DEVICE_ID_ENE_CB712_SD,
>  		.subvendor	= PCI_ANY_ID,
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index c6d1bd8..483b78e 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1687,7 +1687,8 @@ int sdhci_add_host(struct sdhci_host *host)
>  			host->version);
>  	}
>  
> -	caps = sdhci_readl(host, SDHCI_CAPABILITIES);
> +	caps = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ? host->caps :
> +		sdhci_readl(host, SDHCI_CAPABILITIES);
>  
>  	if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
>  		host->flags |= SDHCI_USE_SDMA;
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index c846813..b1839a3 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -240,6 +240,8 @@ struct sdhci_host {
>  #define SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN		(1<<25)
>  /* Controller cannot support End Attribute in NOP ADMA descriptor */
>  #define SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC		(1<<26)
> +/* Controller is missing device caps. Use caps provided by host */
> +#define SDHCI_QUIRK_MISSING_CAPS			(1<<27)
>  
>  	int			irq;		/* Device IRQ */
>  	void __iomem *		ioaddr;		/* Mapped address */
> @@ -292,6 +294,8 @@ struct sdhci_host {
>  
>  	struct timer_list	timer;		/* Timer for timeouts */
>  
> +	unsigned int		caps;		/* Alternative capabilities */
> +
>  	unsigned long		private[0] ____cacheline_aligned;
>  };
>