85xx: Reworked initial processor init
Reworked the initial processor initialzation sequence:
* introduced cpu_early_init_f that is run in address space 1 (AS=1)
* Moved TLB/LAW and CCSR init into cpu_early_init_f()
* Reworked initial asm code to do most of the core init before TLBs
The main reasons for these changes are to allow handling of 36-bit phys
addresses in the future and some of the issues that will exist when we
do that.
There are a few caveats on what can be initialized via the LAW and TLB
static tables:
* TLB entry 14/15 can't be initialized via the TLB table
* any LAW that covers the implicit boot window (4G-8M to 4G) must map to
the code that is currently executing.
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/cpu/mpc85xx/cpu_init.c b/cpu/mpc85xx/cpu_init.c
index 9a65142..4e2bfe7 100644
--- a/cpu/mpc85xx/cpu_init.c
+++ b/cpu/mpc85xx/cpu_init.c
@@ -31,6 +31,7 @@
#include <asm/processor.h>
#include <ioports.h>
#include <asm/io.h>
+#include <asm/mmu.h>
#include <asm/fsl_law.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -123,6 +124,54 @@
}
#endif
+/* We run cpu_init_early_f in AS = 1 */
+void cpu_init_early_f(void)
+{
+ set_tlb(0, CFG_CCSRBAR, CFG_CCSRBAR,
+ MAS3_SX|MAS3_SW|MAS3_SR, MAS2_I|MAS2_G,
+ 1, 0, BOOKE_PAGESZ_4K, 0);
+
+ /* set up CCSR if we want it moved */
+#if (CFG_CCSRBAR_DEFAULT != CFG_CCSRBAR)
+ {
+ u32 temp;
+
+ set_tlb(0, CFG_CCSRBAR_DEFAULT, CFG_CCSRBAR_DEFAULT,
+ MAS3_SX|MAS3_SW|MAS3_SR, MAS2_I|MAS2_G,
+ 1, 1, BOOKE_PAGESZ_4K, 0);
+
+ temp = in_be32((volatile u32 *)CFG_CCSRBAR_DEFAULT);
+ out_be32((volatile u32 *)CFG_CCSRBAR_DEFAULT, CFG_CCSRBAR >> 12);
+
+ temp = in_be32((volatile u32 *)CFG_CCSRBAR);
+ }
+#endif
+
+ init_laws();
+ invalidate_tlb(0);
+#ifdef CONFIG_FSL_INIT_TLBS
+ init_tlbs();
+#else
+ {
+ extern u32 tlb1_entry;
+ u32 *tmp = &tlb1_entry;
+ int i;
+ int num = tmp[2];
+
+ /* skip to actual table */
+ tmp += 3;
+
+ for (i = 0; i < num; i++, tmp += 4) {
+ mtspr(MAS0, tmp[0]);
+ mtspr(MAS1, tmp[1]);
+ mtspr(MAS2, tmp[2]);
+ mtspr(MAS3, tmp[3]);
+ asm volatile("isync;msync;tlbwe;isync");
+ }
+ }
+#endif
+}
+
/*
* Breathe some life into the CPU...
*
@@ -135,16 +184,15 @@
volatile ccsr_lbc_t *memctl = (void *)(CFG_MPC85xx_LBC_ADDR);
extern void m8560_cpm_reset (void);
+ disable_tlb(14);
+ disable_tlb(15);
+
/* Pointer is writable since we allocated a register for it */
gd = (gd_t *) (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET);
/* Clear initial global data */
memset ((void *) gd, 0, sizeof (gd_t));
-#ifdef CONFIG_FSL_LAW
- init_laws();
-#endif
-
#ifdef CONFIG_CPM2
config_8560_ioports((ccsr_cpm_t *)CFG_MPC85xx_CPM_ADDR);
#endif