From fb5d375d352ee5830b33ccdff06eb4f5f1d603f5 Mon Sep 17 00:00:00 2001 From: Tomasz Figa Date: Fri, 19 Aug 2011 11:54:31 +0200 Subject: ARM: S3C64XX: Add support for synchronous clock operation Some boards based on S3C6410 use synchronous clocking, which means that HCLKx2 and other system clocks are generated from APLL instead of MPLL. This patch adds support for such boards, by calculating hclk2 depending on the status of S3C_OTHERS_SYNCMUXSEL bit in S3C64XX_OTHERS regist Signed-off-by: Tomasz Figa Signed-off-by: Kukjin Kim --- arch/arm/mach-s3c64xx/clock.c | 8 +++++++- arch/arm/mach-s3c64xx/include/mach/regs-sys.h | 1 + 2 files changed, 8 insertions(+), 1 deletion(-) (limited to 'arch/arm/mach-s3c64xx') diff --git a/arch/arm/mach-s3c64xx/clock.c b/arch/arm/mach-s3c64xx/clock.c index 8cf39e33579e..872e68361eb4 100644 --- a/arch/arm/mach-s3c64xx/clock.c +++ b/arch/arm/mach-s3c64xx/clock.c @@ -744,7 +744,13 @@ void __init_or_cpufreq s3c6400_setup_clocks(void) printk(KERN_INFO "S3C64XX: PLL settings, A=%ld, M=%ld, E=%ld\n", apll, mpll, epll); - hclk2 = mpll / GET_DIV(clkdiv0, S3C6400_CLKDIV0_HCLK2); + if(__raw_readl(S3C64XX_OTHERS) & S3C64XX_OTHERS_SYNCMUXSEL) + /* Synchronous mode */ + hclk2 = apll / GET_DIV(clkdiv0, S3C6400_CLKDIV0_HCLK2); + else + /* Asynchronous mode */ + hclk2 = mpll / GET_DIV(clkdiv0, S3C6400_CLKDIV0_HCLK2); + hclk = hclk2 / GET_DIV(clkdiv0, S3C6400_CLKDIV0_HCLK); pclk = hclk2 / GET_DIV(clkdiv0, S3C6400_CLKDIV0_PCLK); diff --git a/arch/arm/mach-s3c64xx/include/mach/regs-sys.h b/arch/arm/mach-s3c64xx/include/mach/regs-sys.h index 774e0de31400..b91e02093289 100644 --- a/arch/arm/mach-s3c64xx/include/mach/regs-sys.h +++ b/arch/arm/mach-s3c64xx/include/mach/regs-sys.h @@ -26,5 +26,6 @@ #define S3C64XX_OTHERS S3C_SYSREG(0x900) #define S3C64XX_OTHERS_USBMASK (1 << 16) +#define S3C64XX_OTHERS_SYNCMUXSEL (1 << 6) #endif /* _PLAT_REGS_SYS_H */ -- cgit v1.2.3