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EXYNOS: clock: add the get_mmc_clk function

PATCH Superseded Jaehoon Chung 1 participant 1 message Jul 3, 2012

Subsystems (2)
Arm (32-bit) Arm Samsung Exynos

v1 of 3 Superseded Latest is v3 →

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Jaehoon Chung

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PATCH 1/2 EXYNOS: clock: add the get_mmc_clk function

To get more exactly sclk value, used the get_mmc_clk.

Signed-off-by Jaehoon Chung <[email protected]>
Signed-off-by Kyungmin Park <[email protected]>
---
 arch/arm/cpu/armv7/exynos/clock.c      |   78 ++++++++++++++++++++++++++++++++
 arch/arm/include/asm/arch-exynos/clk.h |    1 +
 2 files changed, 79 insertions(+), 0 deletions(-)
arch/arm/cpu/armv7/exynos/clock.c +78 -0
index 2f7048b..90fa45c 100644
@@ -360,6 +360,44 @@ static unsigned long exynos5_get_uart_clk(int dev_index)
 	return uclk;
 }
 
+/* exynos4: return mmc clock frequency */
+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;
+	unsigned int ratio;
+	unsigned int pre_ratio;
+
+	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;
+
+	if (dev_index == 0) {
+		ratio = readl(&clk->div_fsys0);
+		pre_ratio = readl(&clk->div_fsys0);
+	} else if (dev_index == 4) {
+		ratio = readl(&clk->div_fsys3);
+		pre_ratio = readl(&clk->div_fsys3);
+	} else
+		return 0;
+
+	ratio = ratio & 0xf;
+	pre_ratio = (pre_ratio >> (dev_index + 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)
 {

@@ -387,6 +425,38 @@ static void exynos4_set_mmc_clk(int dev_index, unsigned int div)
 	writel(val, addr);
 }
 
+/* exynos5: return mmc clock frequency */
+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;
+	unsigned int ratio;
+	unsigned int pre_ratio;
+
+	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;
+
+	ratio = readl(&clk->div_fsys1);
+	ratio = (ratio >> (dev_index << 2)) & 0xf;
+	pre_ratio = readl(&clk->div_fsys1);
+	pre_ratio = (pre_ratio >> ((dev_index<< 4) + 8)) & 0xff;
+
+	uclk = (sclk /(ratio + 1))/(pre_ratio + 1);
+
+	return uclk;
+}
+
 /* exynos5: set the mmc clock */
 static void exynos5_set_mmc_clk(int dev_index, unsigned int div)
 {

@@ -446,6 +516,14 @@ unsigned long get_uart_clk(int dev_index)
 		return exynos4_get_uart_clk(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())
arch/arm/include/asm/arch-exynos/clk.h +1 -0
index ff0f641..9e9d390 100644
@@ -31,6 +31,7 @@
 unsigned long get_pll_clk(int pllreg);
 unsigned long get_arm_clk(void);
 unsigned long get_pwm_clk(void);
+unsigned long get_mmc_clk(int dev_index);
 unsigned long get_uart_clk(int dev_index);
 void set_mmc_clk(int dev_index, unsigned int div);
Signature · 1 line
1.7.4.1