aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorJaehoon Chung <jh80.chung@samsung.com>2012-12-27 22:30:32 +0000
committerMinkyu Kang <mk7.kang@samsung.com>2013-01-11 16:56:31 +0900
commitc39e969e8e30800d3bf3b50f51997026aef0f01d (patch)
treef3172b5dbf102a53570defc4490d130f445dfe9f
parent61b59e2749451d86e73139a81f9f8995e2f4a932 (diff)
downloadu-boot-linaro-stable-c39e969e8e30800d3bf3b50f51997026aef0f01d.tar.gz
Exynos: clock: support get_mmc_clk for exynos
To get exactly clock value for mmc, support the get_mmc_clk() like set_mmc_clk(). Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
-rw-r--r--arch/arm/cpu/armv7/exynos/clock.c102
-rw-r--r--arch/arm/include/asm/arch-exynos/clk.h1
2 files changed, 103 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/exynos/clock.c b/arch/arm/cpu/armv7/exynos/clock.c
index abc327262..031af09c1 100644
--- a/arch/arm/cpu/armv7/exynos/clock.c
+++ b/arch/arm/cpu/armv7/exynos/clock.c
@@ -484,6 +484,100 @@ static unsigned long exynos5_get_uart_clk(int dev_index)
return uclk;
}
+static unsigned long exynos4_get_mmc_clk(int dev_index)
+{
+ struct exynos4_clock *clk =
+ (struct exynos4_clock *)samsung_get_base_clock();
+ unsigned long uclk, sclk;
+ unsigned int sel, ratio, pre_ratio;
+ int shift;
+
+ sel = readl(&clk->src_fsys);
+ sel = (sel >> (dev_index << 2)) & 0xf;
+
+ if (sel == 0x6)
+ sclk = get_pll_clk(MPLL);
+ else if (sel == 0x7)
+ sclk = get_pll_clk(EPLL);
+ else if (sel == 0x8)
+ sclk = get_pll_clk(VPLL);
+ else
+ return 0;
+
+ switch (dev_index) {
+ case 0:
+ case 1:
+ ratio = readl(&clk->div_fsys1);
+ pre_ratio = readl(&clk->div_fsys1);
+ break;
+ case 2:
+ case 3:
+ ratio = readl(&clk->div_fsys2);
+ pre_ratio = readl(&clk->div_fsys2);
+ break;
+ case 4:
+ ratio = readl(&clk->div_fsys3);
+ pre_ratio = readl(&clk->div_fsys3);
+ break;
+ default:
+ return 0;
+ }
+
+ if (dev_index == 1 || dev_index == 3)
+ shift = 16;
+
+ ratio = (ratio >> shift) & 0xf;
+ pre_ratio = (pre_ratio >> (shift + 8)) & 0xff;
+ uclk = (sclk / (ratio + 1)) / (pre_ratio + 1);
+
+ return uclk;
+}
+
+static unsigned long exynos5_get_mmc_clk(int dev_index)
+{
+ struct exynos5_clock *clk =
+ (struct exynos5_clock *)samsung_get_base_clock();
+ unsigned long uclk, sclk;
+ unsigned int sel, ratio, pre_ratio;
+ int shift;
+
+ sel = readl(&clk->src_fsys);
+ sel = (sel >> (dev_index << 2)) & 0xf;
+
+ if (sel == 0x6)
+ sclk = get_pll_clk(MPLL);
+ else if (sel == 0x7)
+ sclk = get_pll_clk(EPLL);
+ else if (sel == 0x8)
+ sclk = get_pll_clk(VPLL);
+ else
+ return 0;
+
+ switch (dev_index) {
+ case 0:
+ case 1:
+ ratio = readl(&clk->div_fsys1);
+ pre_ratio = readl(&clk->div_fsys1);
+ break;
+ case 2:
+ case 3:
+ ratio = readl(&clk->div_fsys2);
+ pre_ratio = readl(&clk->div_fsys2);
+ break;
+ default:
+ return 0;
+ }
+
+ if (dev_index == 1 || dev_index == 3)
+ shift = 16;
+
+ ratio = (ratio >> shift) & 0xf;
+ pre_ratio = (pre_ratio >> (shift + 8)) & 0xff;
+ uclk = (sclk / (ratio + 1)) / (pre_ratio + 1);
+
+ return uclk;
+}
+
/* exynos4: set the mmc clock */
static void exynos4_set_mmc_clk(int dev_index, unsigned int div)
{
@@ -1130,6 +1224,14 @@ unsigned long get_uart_clk(int dev_index)
}
}
+unsigned long get_mmc_clk(int dev_index)
+{
+ if (cpu_is_exynos5())
+ return exynos5_get_mmc_clk(dev_index);
+ else
+ return exynos4_get_mmc_clk(dev_index);
+}
+
void set_mmc_clk(int dev_index, unsigned int div)
{
if (cpu_is_exynos5())
diff --git a/arch/arm/include/asm/arch-exynos/clk.h b/arch/arm/include/asm/arch-exynos/clk.h
index cd1232350..1935b0b5b 100644
--- a/arch/arm/include/asm/arch-exynos/clk.h
+++ b/arch/arm/include/asm/arch-exynos/clk.h
@@ -34,6 +34,7 @@ unsigned long get_arm_clk(void);
unsigned long get_i2c_clk(void);
unsigned long get_pwm_clk(void);
unsigned long get_uart_clk(int dev_index);
+unsigned long get_mmc_clk(int dev_index);
void set_mmc_clk(int dev_index, unsigned int div);
unsigned long get_lcd_clk(void);
void set_lcd_clk(void);