From: Maxim Sloyko maxims@google.com
This is needed by I2C driver.
Signed-off-by: Maxim Sloyko maxims@google.com --- arch/arm/include/asm/arch-aspeed/ast_scu.h | 1 + arch/arm/mach-aspeed/ast-scu.c | 11 +++++++++++ 2 files changed, 12 insertions(+)
diff --git a/arch/arm/include/asm/arch-aspeed/ast_scu.h b/arch/arm/include/asm/arch-aspeed/ast_scu.h index d248416..eb5aaa2 100644 --- a/arch/arm/include/asm/arch-aspeed/ast_scu.h +++ b/arch/arm/include/asm/arch-aspeed/ast_scu.h @@ -38,6 +38,7 @@ extern void ast_scu_get_who_init_dram(void); extern u32 ast_get_clk_source(void); extern u32 ast_get_h_pll_clk(void); extern u32 ast_get_ahbclk(void); +extern u32 ast_get_apbclk(void);
extern u32 ast_scu_get_vga_memsize(void);
diff --git a/arch/arm/mach-aspeed/ast-scu.c b/arch/arm/mach-aspeed/ast-scu.c index 280c421..e00dbe2 100644 --- a/arch/arm/mach-aspeed/ast-scu.c +++ b/arch/arm/mach-aspeed/ast-scu.c @@ -318,6 +318,17 @@ u32 ast_get_ahbclk(void)
#endif /* AST_SOC_G5 */
+u32 ast_get_apbclk(void) +{ + u32 h_pll = ast_get_h_pll_clk(); + /* The formula for converting the bit pattern to divisor is + * (4 + 4 * DIV), according to datasheet + */ + u32 apb_div = 4 + 4 * SCU_GET_PCLK_DIV(ast_scu_read(AST_SCU_CLK_SEL)); + return h_pll / apb_div; +} + + void ast_scu_show_system_info(void) {