From 68a8cbfad93241387ee1385b9d19e3e2b7919c4e Mon Sep 17 00:00:00 2001 From: Jaehoon Chung Date: Tue, 17 May 2011 21:19:17 +0000 Subject: S5P: add set_mmc_clk for external clock control This patch added set_mmc_clk for external clock control. c210 didn't support host clock control. So We need external_clock_control function for c210. Signed-off-by: Jaehoon Chung Signed-off-by: Minkyu Kang Signed-off-by: Kyungmin Park --- arch/arm/cpu/armv7/s5pc1xx/clock.c | 5 +++++ arch/arm/cpu/armv7/s5pc2xx/clock.c | 32 ++++++++++++++++++++++++++++++++ 2 files changed, 37 insertions(+) (limited to 'arch/arm/cpu/armv7') diff --git a/arch/arm/cpu/armv7/s5pc1xx/clock.c b/arch/arm/cpu/armv7/s5pc1xx/clock.c index e92647cdfc..1c87e8f8cd 100644 --- a/arch/arm/cpu/armv7/s5pc1xx/clock.c +++ b/arch/arm/cpu/armv7/s5pc1xx/clock.c @@ -336,3 +336,8 @@ unsigned long get_uart_clk(int dev_index) { return s5pc1xx_get_uart_clk(dev_index); } + +void set_mmc_clk(int dev_index, unsigned int div) +{ + /* Do NOTHING */ +} diff --git a/arch/arm/cpu/armv7/s5pc2xx/clock.c b/arch/arm/cpu/armv7/s5pc2xx/clock.c index 450a630486..624de6257c 100644 --- a/arch/arm/cpu/armv7/s5pc2xx/clock.c +++ b/arch/arm/cpu/armv7/s5pc2xx/clock.c @@ -199,6 +199,33 @@ static unsigned long s5pc210_get_uart_clk(int dev_index) return uclk; } +/* s5pc210: set the mmc clock */ +static void s5pc210_set_mmc_clk(int dev_index, unsigned int div) +{ + struct s5pc210_clock *clk = + (struct s5pc210_clock *)samsung_get_base_clock(); + unsigned int addr; + unsigned int val; + + /* + * CLK_DIV_FSYS1 + * MMC0_PRE_RATIO [15:8], MMC1_PRE_RATIO [31:24] + * CLK_DIV_FSYS2 + * MMC2_PRE_RATIO [15:8], MMC3_PRE_RATIO [31:24] + */ + if (dev_index < 2) { + addr = (unsigned int)&clk->div_fsys1; + } else { + addr = (unsigned int)&clk->div_fsys2; + dev_index -= 2; + } + + val = readl(addr); + val &= ~(0xff << ((dev_index << 4) + 8)); + val |= (div & 0xff) << ((dev_index << 4) + 8); + writel(val, addr); +} + unsigned long get_pll_clk(int pllreg) { return s5pc210_get_pll_clk(pllreg); @@ -218,3 +245,8 @@ unsigned long get_uart_clk(int dev_index) { return s5pc210_get_uart_clk(dev_index); } + +void set_mmc_clk(int dev_index, unsigned int div) +{ + s5pc210_set_mmc_clk(dev_index, div); +} -- cgit v1.2.1