>From fd40adef6ce474d5323edcaa833f675b0eb649cb Mon Sep 17 00:00:00 2001
From: Zhangfei Gao <zgao6@xxxxxxxxxxx>
Date: Fri, 6 Aug 2010 07:10:01 +0800
Subject: [PATCH] sdhci: support 10-bit divided clock Mode
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Cc: Matt Fleming <matt@xxxxxxxxxxxxxxxxx>
Cc: Michał Mirosław <mirqus@xxxxxxxxx>
Signed-off-by: Zhangfei Gao <zgao6@xxxxxxxxxxx>
---
drivers/mmc/host/sdhci.c | 22 ++++++++++++++++------
drivers/mmc/host/sdhci.h | 5 +++++
2 files changed, 21 insertions(+), 6 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 913555e..32dcac9 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -983,7 +983,7 @@ static void sdhci_finish_command(struct sdhci_host *host)
static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
{
- int div;
+ int div, max_div;
u16 clk;
unsigned long timeout;
@@ -1001,13 +1001,23 @@ static void sdhci_set_clock(struct sdhci_host
*host, unsigned int clock)
if (clock == 0)
goto out;
- for (div = 1;div < 256;div *= 2) {
- if ((host->max_clk / div) <= clock)
- break;
+ if (host->version >= SDHCI_SPEC_300)
+ max_div = 2046;
+ else
+ max_div = 256;
+
+ if(host->max_clk <= clock)
+ div = 1;
+ else {
+ for (div = 2; div < max_div; div += 2) {
+ if ((host->max_clk / div) <= clock)
+ break;
+ }
}
div >>= 1;
- clk = div << SDHCI_DIVIDER_SHIFT;
+ clk = (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
+ clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN) <<
SDHCI_DIVIDER_HI_SHIFT;
clk |= SDHCI_CLOCK_INT_EN;
sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
@@ -1707,7 +1717,7 @@ int sdhci_add_host(struct sdhci_host *host)
host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
host->version = (host->version & SDHCI_SPEC_VER_MASK)
>> SDHCI_SPEC_VER_SHIFT;
- if (host->version > SDHCI_SPEC_200) {
+ if (host->version > SDHCI_SPEC_300) {
printk(KERN_ERR "%s: Unknown controller version (%d). "
"You may experience problems.\n", mmc_hostname(mmc),
host->version);
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 036cfae..50860dc 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -86,6 +86,10 @@
#define SDHCI_CLOCK_CONTROL 0x2C
#define SDHCI_DIVIDER_SHIFT 8
+#define SDHCI_DIVIDER_HI_SHIFT 6
+#define SDHCI_DIV_MASK 0xFF
+#define SDHCI_DIV_MASK_LEN 8
+#define SDHCI_DIV_HI_MASK 0x300
#define SDHCI_CLOCK_CARD_EN 0x0004
#define SDHCI_CLOCK_INT_STABLE 0x0002
#define SDHCI_CLOCK_INT_EN 0x0001
@@ -178,6 +182,7 @@
#define SDHCI_SPEC_VER_SHIFT 0
#define SDHCI_SPEC_100 0
#define SDHCI_SPEC_200 1
+#define SDHCI_SPEC_300 2
struct sdhci_ops;
--
1.7.0.4
From fd40adef6ce474d5323edcaa833f675b0eb649cb Mon Sep 17 00:00:00 2001
From: Zhangfei Gao <zgao6@xxxxxxxxxxx>
Date: Fri, 6 Aug 2010 07:10:01 +0800
Subject: [PATCH] sdhci: support 10-bit divided clock Mode
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Cc: Matt Fleming <matt@xxxxxxxxxxxxxxxxx>
Cc: Michał Mirosław <mirqus@xxxxxxxxx>
Signed-off-by: Zhangfei Gao <zgao6@xxxxxxxxxxx>
---
drivers/mmc/host/sdhci.c | 22 ++++++++++++++++------
drivers/mmc/host/sdhci.h | 5 +++++
2 files changed, 21 insertions(+), 6 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 913555e..32dcac9 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -983,7 +983,7 @@ static void sdhci_finish_command(struct sdhci_host *host)
static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
{
- int div;
+ int div, max_div;
u16 clk;
unsigned long timeout;
@@ -1001,13 +1001,23 @@ static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
if (clock == 0)
goto out;
- for (div = 1;div < 256;div *= 2) {
- if ((host->max_clk / div) <= clock)
- break;
+ if (host->version >= SDHCI_SPEC_300)
+ max_div = 2046;
+ else
+ max_div = 256;
+
+ if(host->max_clk <= clock)
+ div = 1;
+ else {
+ for (div = 2; div < max_div; div += 2) {
+ if ((host->max_clk / div) <= clock)
+ break;
+ }
}
div >>= 1;
- clk = div << SDHCI_DIVIDER_SHIFT;
+ clk = (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
+ clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN) << SDHCI_DIVIDER_HI_SHIFT;
clk |= SDHCI_CLOCK_INT_EN;
sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
@@ -1707,7 +1717,7 @@ int sdhci_add_host(struct sdhci_host *host)
host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
host->version = (host->version & SDHCI_SPEC_VER_MASK)
>> SDHCI_SPEC_VER_SHIFT;
- if (host->version > SDHCI_SPEC_200) {
+ if (host->version > SDHCI_SPEC_300) {
printk(KERN_ERR "%s: Unknown controller version (%d). "
"You may experience problems.\n", mmc_hostname(mmc),
host->version);
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 036cfae..50860dc 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -86,6 +86,10 @@
#define SDHCI_CLOCK_CONTROL 0x2C
#define SDHCI_DIVIDER_SHIFT 8
+#define SDHCI_DIVIDER_HI_SHIFT 6
+#define SDHCI_DIV_MASK 0xFF
+#define SDHCI_DIV_MASK_LEN 8
+#define SDHCI_DIV_HI_MASK 0x300
#define SDHCI_CLOCK_CARD_EN 0x0004
#define SDHCI_CLOCK_INT_STABLE 0x0002
#define SDHCI_CLOCK_INT_EN 0x0001
@@ -178,6 +182,7 @@
#define SDHCI_SPEC_VER_SHIFT 0
#define SDHCI_SPEC_100 0
#define SDHCI_SPEC_200 1
+#define SDHCI_SPEC_300 2
struct sdhci_ops;
--
1.7.0.4
