The 16-19th bits of CE_CLK_CTRL set the
MMC clock frequency.
Cc: Yusuke Goda <yusuke.goda.sx@xxxxxxxxxxx>
Cc: Magnus Damm <magnus.damm@xxxxxxxxx>
Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
---
include/linux/mmc/sh_mmcif.h | 17 +++++++++--------
1 files changed, 9 insertions(+), 8 deletions(-)
diff --git a/include/linux/mmc/sh_mmcif.h b/include/linux/mmc/sh_mmcif.h
index 519a2cd..44fc534 100644
--- a/include/linux/mmc/sh_mmcif.h
+++ b/include/linux/mmc/sh_mmcif.h
@@ -77,6 +77,9 @@ struct sh_mmcif_plat_data {
#define CLK_ENABLE (1 << 24) /* 1: output mmc clock */
#define CLK_CLEAR ((1 << 19) | (1 << 18) | (1 << 17) | (1 << 16))
#define CLK_SUP_PCLK ((1 << 19) | (1 << 18) | (1 << 17) | (1 << 16))
+#define CLKDIV_4 (1<<16) /* mmc clock frequency.
+ * n: bus clock/(2^(n+1)) */
+#define CLKDIV_256 (7<<16) /* mmc clock frequency. (see above) */
#define SRSPTO_256 ((1 << 13) | (0 << 12)) /* resp timeout */
#define SRBSYTO_29 ((1 << 11) | (1 << 10) | \
(1 << 9) | (1 << 8)) /* resp busy timeout */
@@ -185,14 +188,10 @@ static inline void sh_mmcif_boot_init(void __iomem *base)
/* Set block size in MMCIF hardware */
sh_mmcif_writel(base, MMCIF_CE_BLOCK_SET, SH_MMCIF_BBS);
- /* Enable the clock, set it to Bus clock/256 (about 325Khz).
- * It is unclear where 0x70000 comes from or if it is even needed.
- * It is there for byte-compatibility with code that is known to
- * work.
- */
+ /* Enable the clock, set it to Bus clock/256 (about 325Khz). */
sh_mmcif_writel(base, MMCIF_CE_CLK_CTRL,
- CLK_ENABLE | SRSPTO_256 | SRBSYTO_29 | SRWDTO_29 |
- SCCSTO_29 | 0x70000);
+ CLK_ENABLE | CLKDIV_256 | SRSPTO_256 |
+ SRBSYTO_29 | SRWDTO_29 | SCCSTO_29);
/* CMD0 */
sh_mmcif_boot_cmd(base, 0x00000040, 0);
@@ -217,7 +216,9 @@ static inline void sh_mmcif_boot_slurp(void __iomem *base,
unsigned long tmp;
/* In data transfer mode: Set clock to Bus clock/4 (about 20Mhz) */
- sh_mmcif_writel(base, MMCIF_CE_CLK_CTRL, 0x01012fff);
+ sh_mmcif_writel(base, MMCIF_CE_CLK_CTRL,
+ CLK_ENABLE | CLKDIV_4 | SRSPTO_256 |
+ SRBSYTO_29 | SRWDTO_29 | SCCSTO_29);
/* CMD9 - Get CSD */
sh_mmcif_boot_cmd(base, 0x09806000, 0x00010000);
--
1.7.2.3
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