85xx: Improve flash remapping on MPC8572DS & MPC8536DS

Changing the flash from cacheable to cache-inhibited was taking a significant
amount of time due to the fact that we were iterating over the full 256M of
flash.  Instead we can just flush the L1 d-cache and invalidate the i-cache.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

board/freescale/mpc8536ds/mpc8536ds.c

@@ -25,6 +25,7 @@
 #include <pci.h>
 #include <asm/processor.h>
 #include <asm/mmu.h>
+#include <asm/cache.h>
 #include <asm/immap_85xx.h>
 #include <asm/immap_fsl_pci.h>
 #include <asm/fsl_ddr_sdram.h>
@@ -441,7 +442,6 @@ pci_init_board(void)
 
 int board_early_init_r(void)
 {
-	unsigned int i;
 	const unsigned int flashbase = CONFIG_SYS_FLASH_BASE;
 	const u8 flash_esel = 1;
 
@@ -450,11 +450,9 @@ int board_early_init_r(void)
 	 * so that flash can be erased properly.
 	 */
 
-	/* Invalidate any remaining lines of the flash from caches. */
-	for (i = 0; i < 256*1024*1024; i+=32) {
-		asm volatile ("dcbi %0,%1": : "b" (flashbase), "r" (i));
-		asm volatile ("icbi %0,%1": : "b" (flashbase), "r" (i));
-	}
+	/* Flush d-cache and invalidate i-cache of any FLASH data */
+        flush_dcache();
+        invalidate_icache();
 
 	/* invalidate existing TLB entry for flash + promjet */
 	disable_tlb(flash_esel);

board/freescale/mpc8536ds/tlb.c

@@ -54,7 +54,7 @@ struct fsl_e_tlb_entry tlb_table[] = {
 	/* W**G* - Flash/promjet, localbus */
 	/* This will be changed to *I*G* after relocation to RAM. */
 	SET_TLB_ENTRY(1, CONFIG_SYS_FLASH_BASE, CONFIG_SYS_FLASH_BASE,
-		      MAS3_SX|MAS3_SW|MAS3_SR, MAS2_W|MAS2_G,
+		      MAS3_SX|MAS3_SR, MAS2_W|MAS2_G,
 		      0, 1, BOOKE_PAGESZ_256M, 1),
 
 	/* *I*G* - PCI */

board/freescale/mpc8572ds/mpc8572ds.c

@@ -25,6 +25,7 @@
 #include <pci.h>
 #include <asm/processor.h>
 #include <asm/mmu.h>
+#include <asm/cache.h>
 #include <asm/immap_85xx.h>
 #include <asm/immap_fsl_pci.h>
 #include <asm/fsl_ddr_sdram.h>
@@ -359,7 +360,6 @@ void pci_init_board(void)
 
 int board_early_init_r(void)
 {
-	unsigned int i;
 	const unsigned int flashbase = CONFIG_SYS_FLASH_BASE;
 	const u8 flash_esel = 2;
 
@@ -368,11 +368,9 @@ int board_early_init_r(void)
 	 * so that flash can be erased properly.
 	 */
 
-	/* Invalidate any remaining lines of the flash from caches. */
-	for (i = 0; i < 256*1024*1024; i+=32) {
-		asm volatile ("dcbi %0,%1": : "b" (flashbase), "r" (i));
-		asm volatile ("icbi %0,%1": : "b" (flashbase), "r" (i));
-	}
+	/* Flush d-cache and invalidate i-cache of any FLASH data */
+        flush_dcache();
+        invalidate_icache();
 
 	/* invalidate existing TLB entry for flash + promjet */
 	disable_tlb(flash_esel);

board/freescale/mpc8572ds/tlb.c

@@ -59,7 +59,7 @@ struct fsl_e_tlb_entry tlb_table[] = {
 	/* W**G* - Flash/promjet, localbus */
 	/* This will be changed to *I*G* after relocation to RAM. */
 	SET_TLB_ENTRY(1, CONFIG_SYS_FLASH_BASE, CONFIG_SYS_FLASH_BASE,
-		      MAS3_SX|MAS3_SW|MAS3_SR, MAS2_W|MAS2_G,
+		      MAS3_SX|MAS3_SR, MAS2_W|MAS2_G,
 		      0, 2, BOOKE_PAGESZ_256M, 1),
 
 	/* *I*G* - PCI */