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authorSimon Horman <horms@verge.net.au>2011-06-21 08:00:10 +0900
committerChris Ball <cjb@laptop.org>2011-07-20 17:20:57 -0400
commit973ed3af1a570612771ed10dec6506c757767668 (patch)
treedb993034cacfcc3f3388c43d96459a123adc32a2 /drivers/mmc/host/sh_mobile_sdhi.c
parenta11862d3389d4304211eed0758f510d5e573f93c (diff)
mmc: sdhi: Add write16_hook
Some controllers require waiting for the bus to become idle before writing to some registers. I have implemented this by adding a hook to sd_ctrl_write16() and implementing a hook for SDHI which waits for the bus to become idle. Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Cc: Magnus Damm <magnus.damm@gmail.com> Signed-off-by: Simon Horman <horms@verge.net.au> Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc/host/sh_mobile_sdhi.c')
-rw-r--r--drivers/mmc/host/sh_mobile_sdhi.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/mmc/host/sh_mobile_sdhi.c b/drivers/mmc/host/sh_mobile_sdhi.c
index ce500f03df85..774f6439d7ce 100644
--- a/drivers/mmc/host/sh_mobile_sdhi.c
+++ b/drivers/mmc/host/sh_mobile_sdhi.c
@@ -26,6 +26,7 @@
#include <linux/mmc/sh_mobile_sdhi.h>
#include <linux/mfd/tmio.h>
#include <linux/sh_dma.h>
+#include <linux/delay.h>
#include "tmio_mmc.h"
@@ -55,6 +56,39 @@ static int sh_mobile_sdhi_get_cd(struct platform_device *pdev)
return -ENOSYS;
}
+static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
+{
+ int timeout = 1000;
+
+ while (--timeout && !(sd_ctrl_read16(host, CTL_STATUS2) & (1 << 13)))
+ udelay(1);
+
+ if (!timeout) {
+ dev_warn(host->pdata->dev, "timeout waiting for SD bus idle\n");
+ return -EBUSY;
+ }
+
+ return 0;
+}
+
+static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
+{
+ switch (addr)
+ {
+ case CTL_SD_CMD:
+ case CTL_STOP_INTERNAL_ACTION:
+ case CTL_XFER_BLK_COUNT:
+ case CTL_SD_CARD_CLK_CTL:
+ case CTL_SD_XFER_LEN:
+ case CTL_SD_MEM_CARD_OPT:
+ case CTL_TRANSACTION_CTL:
+ case CTL_DMA_ENABLE:
+ return sh_mobile_sdhi_wait_idle(host);
+ }
+
+ return 0;
+}
+
static int __devinit sh_mobile_sdhi_probe(struct platform_device *pdev)
{
struct sh_mobile_sdhi *priv;
@@ -86,6 +120,8 @@ static int __devinit sh_mobile_sdhi_probe(struct platform_device *pdev)
mmc_data->hclk = clk_get_rate(priv->clk);
mmc_data->set_pwr = sh_mobile_sdhi_set_pwr;
mmc_data->get_cd = sh_mobile_sdhi_get_cd;
+ if (mmc_data->flags & TMIO_MMC_HAS_IDLE_WAIT)
+ mmc_data->write16_hook = sh_mobile_sdhi_write16_hook;
mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
if (p) {
mmc_data->flags = p->tmio_flags;