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mmc: SDHI: add SoC specific workaround via HW version

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One of Renesas SDHI chip needs workaround to use it, and, we can judge
it based on chip version.  This patch adds very quick-hack workaround
method, since we still don't know how many chips need workaround in
the future.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Kuninori Morimoto 2013-11-20 00:31:13 -08:00 committed by Chris Ball
parent 5d60e50054
commit e3c418f1b2
2 changed files with 12 additions and 0 deletions
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11
drivers/mmc/host/sh_mobile_sdhi.c
View file

@ -33,6 +33,8 @@
#include "tmio_mmc.h"
#define EXT_ACC 0xe4
struct sh_mobile_sdhi_of_data {
unsigned long tmio_flags;
};
@ -137,6 +139,7 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev)
int irq, ret, i = 0;
bool multiplexed_isr = true;
struct tmio_mmc_dma *dma_priv;
u16 ver;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
@ -218,6 +221,14 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev)
if (ret < 0)
goto eprobe;
/*
* FIXME:
* this Workaround can be more clever method
*/
ver = sd_ctrl_read16(host, CTL_VERSION);
if (ver == 0xCB0D)
sd_ctrl_write16(host, EXT_ACC, 1);
/*
* Allow one or more specific (named) ISRs or
* one or more multiplexed (un-named) ISRs.

1
include/linux/mmc/tmio.h
View file

@ -33,6 +33,7 @@
#define CTL_SDIO_IRQ_MASK 0x38
#define CTL_DMA_ENABLE 0xd8
#define CTL_RESET_SD 0xe0
#define CTL_VERSION 0xe2
#define CTL_SDIO_REGS 0x100
#define CTL_CLK_AND_WAIT_CTL 0x138
#define CTL_RESET_SDIO 0x1e0