mpc85xx: Add the ability to set LCRR[CLKDIV] to improve R/W speed of flash
Signed-off-by: Lan Chunhe <b25806@freescale.com>
Signed-off-by: Roy Zang <tie-fei.zang@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c b/arch/powerpc/cpu/mpc85xx/cpu_init.c
index b517e06..e578b29 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c
@@ -260,6 +260,10 @@
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 @@
#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;
}
diff --git a/arch/powerpc/include/asm/fsl_lbc.h b/arch/powerpc/include/asm/fsl_lbc.h
index 5723de6..dfe8f79 100644
--- a/arch/powerpc/include/asm/fsl_lbc.h
+++ b/arch/powerpc/include/asm/fsl_lbc.h
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2004-2008 Freescale Semiconductor, Inc.
+ * Copyright (C) 2004-2008,2010 Freescale Semiconductor, Inc.
*
* See file CREDITS for list of people who contributed to this
* project.
@@ -125,8 +125,12 @@
#define OR_GPCM_SETA_SHIFT 3
#define OR_GPCM_TRLX 0x00000004
#define OR_GPCM_TRLX_SHIFT 2
+#define OR_GPCM_TRLX_CLEAR 0x00000000
+#define OR_GPCM_TRLX_SET 0x00000004
#define OR_GPCM_EHTR 0x00000002
#define OR_GPCM_EHTR_SHIFT 1
+#define OR_GPCM_EHTR_CLEAR 0x00000000
+#define OR_GPCM_EHTR_SET 0x00000002
#define OR_GPCM_EAD 0x00000001
#define OR_GPCM_EAD_SHIFT 0