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| author | Shiraz Hashim <shiraz.hashim@st.com> | 2012-05-07 13:06:59 +0530 |
|---|---|---|
| committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2012-07-07 14:07:42 +0200 |
| commit | 7c885a0e5532abcd6bc802d21a7858420e5c127b (patch) | |
| tree | 9441156596340e8797fd535fc30a5cead8e7decf | |
| parent | 8337aa5c0b22bc9e1d8ae9d7b2270735670233bd (diff) | |
| download | u-boot-imx-7c885a0e5532abcd6bc802d21a7858420e5c127b.zip u-boot-imx-7c885a0e5532abcd6bc802d21a7858420e5c127b.tar.gz u-boot-imx-7c885a0e5532abcd6bc802d21a7858420e5c127b.tar.bz2 | |
SPEAr: explicitly select clk src for UART
UART in u-boot intends to run on 48MHz clock supplied by USB PLL.
Explicitly select the intended clock source.
Signed-off-by: Shiraz Hashim <shiraz.hashim@st.com>
Signed-off-by: Amit Virdi <amit.virdi@st.com>
Acked-by: Stefan Roese <sr@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>
| -rw-r--r-- | arch/arm/cpu/arm926ejs/spear/cpu.c | 7 | ||||
| -rw-r--r-- | arch/arm/include/asm/arch-spear/spr_misc.h | 2 |
2 files changed, 8 insertions, 1 deletions
diff --git a/arch/arm/cpu/arm926ejs/spear/cpu.c b/arch/arm/cpu/arm926ejs/spear/cpu.c index 9e074bc..e299de3 100644 --- a/arch/arm/cpu/arm926ejs/spear/cpu.c +++ b/arch/arm/cpu/arm926ejs/spear/cpu.c @@ -30,7 +30,7 @@ int arch_cpu_init(void) { struct misc_regs *const misc_p = (struct misc_regs *)CONFIG_SPEAR_MISCBASE; - u32 periph1_clken; + u32 periph1_clken, periph_clk_cfg; periph1_clken = readl(&misc_p->periph1_clken); @@ -42,6 +42,11 @@ int arch_cpu_init(void) #if defined(CONFIG_PL011_SERIAL) periph1_clken |= MISC_UART0ENB; + + periph_clk_cfg = readl(&misc_p->periph_clk_cfg); + periph_clk_cfg &= ~CONFIG_SPEAR_UARTCLKMSK; + periph_clk_cfg |= CONFIG_SPEAR_UART48M; + writel(periph_clk_cfg, &misc_p->periph_clk_cfg); #endif #if defined(CONFIG_DESIGNWARE_ETH) periph1_clken |= MISC_ETHENB; diff --git a/arch/arm/include/asm/arch-spear/spr_misc.h b/arch/arm/include/asm/arch-spear/spr_misc.h index b10c726..384944d 100644 --- a/arch/arm/include/asm/arch-spear/spr_misc.h +++ b/arch/arm/include/asm/arch-spear/spr_misc.h @@ -110,6 +110,8 @@ struct misc_regs { /* PERIPH_CLK_CFG value */ #define MISC_GPT3SYNTH 0x00000400 #define MISC_GPT4SYNTH 0x00000800 +#define CONFIG_SPEAR_UART48M 0 +#define CONFIG_SPEAR_UARTCLKMSK (0x1 << 4) /* PRSC_CLK_CFG value */ /* |