[1/8,V3] EXYNOS: CLK: Add i2c clock

Message ID 1340088319-10072-2-git-send-email-rajeshwari.s@samsung.com
State New
Headers show

Commit Message

Rajeshwari Shinde June 19, 2012, 6:45 a.m.
This adds i2c clock information for EXYNOS5.

Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
---
changes in V2:
        - Incorporated comments from Simon Glass which are removed extra
        braces around (readl(&clk->div_top1)) >> 24 and gave a tab space for
        return statement.
Changes in V3:
	- None
 arch/arm/cpu/armv7/exynos/clock.c      |   33 ++++++++++++++++++++++++++++++++
 arch/arm/include/asm/arch-exynos/clk.h |    1 +
 2 files changed, 34 insertions(+), 0 deletions(-)

Patch

diff --git a/arch/arm/cpu/armv7/exynos/clock.c b/arch/arm/cpu/armv7/exynos/clock.c
index 330bd75..a80928b 100644
--- a/arch/arm/cpu/armv7/exynos/clock.c
+++ b/arch/arm/cpu/armv7/exynos/clock.c
@@ -578,6 +578,29 @@  void exynos4_set_mipi_clk(void)
 	writel(cfg, &clk->div_lcd0);
 }
 
+/*
+ * I2C
+ *
+ * exynos5: obtaining the I2C clock
+ */
+static unsigned long exynos5_get_i2c_clk(void)
+{
+	struct exynos5_clock *clk =
+		(struct exynos5_clock *)samsung_get_base_clock();
+	unsigned long aclk_66, aclk_66_pre, sclk;
+	unsigned int ratio;
+
+	sclk = get_pll_clk(MPLL);
+
+	ratio = (readl(&clk->div_top1)) >> 24;
+	ratio &= (0x7);
+	aclk_66_pre = sclk/(ratio+1);
+	ratio = readl(&clk->div_top0);
+	ratio &= (0x7);
+	aclk_66 = aclk_66_pre/(ratio+1);
+	return aclk_66;
+}
+
 unsigned long get_pll_clk(int pllreg)
 {
 	if (cpu_is_exynos5())
@@ -594,6 +617,16 @@  unsigned long get_arm_clk(void)
 		return exynos4_get_arm_clk();
 }
 
+unsigned long get_i2c_clk(void)
+{
+	if (cpu_is_exynos5()) {
+		return exynos5_get_i2c_clk();
+	} else {
+		debug("I2C clock is not set for this CPU\n");
+		return 0;
+	}
+}
+
 unsigned long get_pwm_clk(void)
 {
 	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 637fb4b..72dc655 100644
--- a/arch/arm/include/asm/arch-exynos/clk.h
+++ b/arch/arm/include/asm/arch-exynos/clk.h
@@ -30,6 +30,7 @@ 
 
 unsigned long get_pll_clk(int pllreg);
 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);
 void set_mmc_clk(int dev_index, unsigned int div);