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mmc: sh_mmcif: revision-specific CLK_CTRL2 handling

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Some newer MMCIF IP revisions contain a CE_CLK_CTRL2 register, that has to
be set for proper operation. Support for this feature is added in a way to
preserve the current behaviour by default, i.e. when it is not enabled
in platform data. Patch is based on work by Nobuyuki HIRAI.

Signed-off-by: Guennadi Liakhovetski <[email protected]>
Signed-off-by: Chris Ball <[email protected]>
This commit is contained in:
Guennadi Liakhovetski 2013-07-10 21:21:13 +02:00 • committed by Chris Ball
commit 6d6fd36742
2 changed files with 6 additions and 0 deletions
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4
drivers/mmc/host/sh_mmcif.c
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@ -247,6 +247,7 @@ struct sh_mmcif_host {
bool power;
bool card_present;
bool ccs_enable; /* Command Completion Signal support */
bool clk_ctrl2_enable;
struct mutex thread_lock;
/* DMA support */
@ -497,6 +498,8 @@ static void sh_mmcif_sync_reset(struct sh_mmcif_host *host)
sh_mmcif_writel(host->addr, MMCIF_CE_VERSION, SOFT_RST_OFF);
if (host->ccs_enable)
tmp |= SCCSTO_29;
if (host->clk_ctrl2_enable)
sh_mmcif_writel(host->addr, MMCIF_CE_CLK_CTRL2, 0x0F0F0000);
sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, tmp |
SRSPTO_256 | SRBSYTO_29 | SRWDTO_29);
/* byte swap on */
@ -1398,6 +1401,7 @@ static int sh_mmcif_probe(struct platform_device *pdev)
host->addr = reg;
host->timeout = msecs_to_jiffies(1000);
host->ccs_enable = !pd || !pd->ccs_unsupported;
host->clk_ctrl2_enable = pd && pd->clk_ctrl2_present;
host->pd = pdev;