armv7: Clean up the mmu setup a bit

The previous incarnation did not use all of mmu_setup, which meant
we did not carefully disable things before (possibly) changing them.

This code is tested and works, and it's a bit of a simplification.

Change-Id: I0560f9b8e25f31cd90e34304d6ec987fc5c87699
Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/2204
Reviewed-by: Peter Stuge <peter@stuge.se>
Tested-by: build bot (Jenkins)

src/arch/armv7/include/common.h

@@ -239,10 +239,10 @@ uint	rd_dc_cst     (void);
 void	wr_dc_cst     (uint);
 void	wr_dc_adr     (uint);
 int	icache_status (void);
-void	icache_enable (void);
+void	icache_enable (unsigned long start, unsigned long size);
 void	icache_disable(void);
 int	dcache_status (void);
-void	dcache_enable (void);
+void	dcache_enable (unsigned long start, unsigned long size);
 void	dcache_disable(void);
 void	mmu_disable(void);
 ulong	get_endaddr   (void);

src/arch/armv7/include/system.h

@@ -106,7 +106,7 @@ void mmu_set_region_dcache(unsigned long start, int size,
  */
 void mmu_page_table_flush(unsigned long start, unsigned long stop);
 
-void dram_bank_mmu_setup(unsigned long start, unsigned long size);
+void mmu_setup(unsigned long start, unsigned long size);
 
 void arm_init_before_mmu(void);
 

src/arch/armv7/lib/cache-cp15.c

@@ -91,32 +91,13 @@ void mmu_set_region_dcache(unsigned long start, int size, enum dcache_option opt
 	mmu_page_table_flush((u32)&page_table[start], (u32)&page_table[end]);
 }
 
-#if 0
-static inline void dram_bank_mmu_setup(int bank)
-{
-//	bd_t *bd = gd->bd;
-	int	i;
-
-	debug("%s: bank: %d\n", __func__, bank);
-	for (i = bd->bi_dram[bank].start >> 20;
-	     i < (bd->bi_dram[bank].start + bd->bi_dram[bank].size) >> 20;
-	     i++) {
-#if defined(CONFIG_SYS_ARM_CACHE_WRITETHROUGH)
-		set_section_dcache(i, DCACHE_WRITETHROUGH);
-#else
-		set_section_dcache(i, DCACHE_WRITEBACK);
-#endif
-	}
-}
-#endif
-
 /**
  * dram_bank_mmu_set - set up the data cache policy for a given dram bank
  *
  * @start:	virtual address start of bank
  * @size:	size of bank (in bytes)
  */
-inline void dram_bank_mmu_setup(unsigned long start, unsigned long size)
+static inline void dram_bank_mmu_setup(unsigned long start, unsigned long size)
 {
 	int	i;
 
@@ -133,27 +114,17 @@ inline void dram_bank_mmu_setup(unsigned long start, unsigned long size)
 }
 
 /* to activate the MMU we need to set up virtual memory: use 1M areas */
-static inline void mmu_setup(void)
+inline void mmu_setup(unsigned long start, unsigned long size)
 {
 	int i;
 	u32 reg;
 
 	arm_init_before_mmu();
+
 	/* Set up an identity-mapping for all 4GB, rw for everyone */
 	for (i = 0; i < 4096; i++)
 		set_section_dcache(i, DCACHE_OFF);
 
-	/* FIXME(dhendrix): u-boot's global data struct was used here... */
-#if 0
-	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
-		dram_bank_mmu_setup(i);
-	}
-#endif
-#if 0
-	/* comes from board's romstage.c, since we need to know which
-	   ranges to setup */
-	mainboard_setup_mmu();
-#endif
 	dram_bank_mmu_setup(CONFIG_SYS_SDRAM_BASE, CONFIG_DRAM_SIZE_MB << 20);
 
 	/* Copy the page table address to cp15 */
@@ -174,13 +145,13 @@ static int mmu_enabled(void)
 }
 
 /* cache_bit must be either CR_I or CR_C */
-static void cache_enable(uint32_t cache_bit)
+static void cache_enable(unsigned long start, unsigned long size, uint32_t cache_bit)
 {
 	uint32_t reg;
 
 	/* The data cache is not active unless the mmu is enabled too */
 	if ((cache_bit == CR_C) && !mmu_enabled())
-		mmu_setup();
+		mmu_setup(start, size);
 	reg = get_cr();	/* get control reg. */
 	cp_delay();
 	set_cr(reg | cache_bit);
@@ -216,9 +187,9 @@ static void cache_disable(uint32_t cache_bit)
 	set_cr(reg & ~cache_bit);
 }
 
-void icache_enable(void)
+void icache_enable(unsigned long start, unsigned long size)
 {
-	cache_enable(CR_I);
+	cache_enable(start, size, CR_I);
 }
 
 void icache_disable(void)
@@ -231,9 +202,9 @@ int icache_status(void)
 	return (get_cr() & CR_I) != 0;
 }
 
-void dcache_enable(void)
+void dcache_enable(unsigned long start, unsigned long size)
 {
-	cache_enable(CR_C);
+	cache_enable(start, size, CR_C);
 }
 
 void dcache_disable(void)

src/cpu/samsung/exynos5250/exynos_cache.c

@@ -39,7 +39,8 @@ enum l2_cache_params {
 void enable_caches(void)
 {
 	/* Enable D-cache. I-cache is already enabled in start.S */
-	dcache_enable();
+	/* can't use it anyway -- it has dependencies we have to fix. */
+	//dcache_enable();
 }
 #endif
 

src/mainboard/google/snow/romstage.c

@@ -37,11 +37,6 @@
 #endif
 #include <console/console.h>
 
-static void mmu_setup(void)
-{
-	dram_bank_mmu_setup(CONFIG_SYS_SDRAM_BASE, CONFIG_DRAM_SIZE_MB * 1024);
-}
-
 void main(void);
 void main(void)
 {
@@ -54,5 +49,5 @@ void main(void)
 	printk(BIOS_INFO, "hello from romstage\n");
 
 //	*pshold &= ~0x100;	/* shut down */
-	mmu_setup();
+	mmu_setup(CONFIG_SYS_SDRAM_BASE, CONFIG_DRAM_SIZE_MB * 1024);
 }