From 3f0202ed13add5fd6e2ed66fcb3f5e1228cdf766 Mon Sep 17 00:00:00 2001 From: Lan Chunhe Date: Wed, 21 Apr 2010 07:40:50 -0500 Subject: mpc85xx: Add the ability to set LCRR[CLKDIV] to improve R/W speed of flash Signed-off-by: Lan Chunhe Signed-off-by: Roy Zang Signed-off-by: Kumar Gala --- arch/powerpc/cpu/mpc85xx/cpu_init.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'arch/powerpc/cpu/mpc85xx/cpu_init.c') diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c b/arch/powerpc/cpu/mpc85xx/cpu_init.c index b517e06608..e578b296df 100644 --- a/arch/powerpc/cpu/mpc85xx/cpu_init.c +++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c @@ -260,6 +260,10 @@ void cpu_init_f (void) int cpu_init_r(void) { +#ifdef CONFIG_SYS_LBC_LCRR + volatile ccsr_lbc_t *lbc = (void *)(CONFIG_SYS_MPC85xx_LBC_ADDR); +#endif + puts ("L2: "); #if defined(CONFIG_L2_CACHE) @@ -383,6 +387,17 @@ int cpu_init_r(void) #if defined(CONFIG_MP) setup_mp(); #endif + +#ifdef CONFIG_SYS_LBC_LCRR + /* + * Modify the CLKDIV field of LCRR register to improve the writing + * speed for NOR flash. + */ + clrsetbits_be32(&lbc->lcrr, LCRR_CLKDIV, CONFIG_SYS_LBC_LCRR); + __raw_readl(&lbc->lcrr); + isync(); +#endif + return 0; } -- cgit