[U-Boot] [PATCH] 85xx: Add support for additional e500mc features

[U-Boot] [PATCH] 85xx: Add support for additional e500mc features

[Kumar Gala]

* Enable backside L2
* e500mc no longer has timebase enable in HID (moved to CCSR register)

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
---
 cpu/mpc85xx/cpu_init.c |   13 +++++++++
 cpu/mpc85xx/fdt.c      |   64 +++++++++++++++++++++++++++++++++++++++++++++++-
 cpu/mpc85xx/release.S  |   16 ++++++++++++
 cpu/mpc85xx/start.S    |    2 +
 4 files changed, 94 insertions(+), 1 deletions(-)

diff --git a/cpu/mpc85xx/cpu_init.c b/cpu/mpc85xx/cpu_init.c
index 0b7c609..c98dd8d 100644
--- a/cpu/mpc85xx/cpu_init.c
+++ b/cpu/mpc85xx/cpu_init.c
@@ -345,6 +345,19 @@ int cpu_init_r(void)
 		asm("msync;isync");
 		puts("enabled\n");
 	}
+#elif defined(CONFIG_BACKSIDE_L2_CACHE)
+	u32 l2cfg0 = mfspr(SPRN_L2CFG0);
+
+	/* invalidate the L2 cache */
+	mtspr(SPRN_L2CSR0, L2CSR0_L2FI);
+	while (mfspr(SPRN_L2CSR0) & L2CSR0_L2FI)
+		;
+
+	/* enable the cache */
+	mtspr(SPRN_L2CSR0, CONFIG_SYS_INIT_L2CSR0);
+
+	if (CONFIG_SYS_INIT_L2CSR0 & L2CSR0_L2E)
+		printf("%d KB enabled\n", (l2cfg0 & 0x3fff) * 64);
 #else
 	puts("disabled\n");
 #endif
diff --git a/cpu/mpc85xx/fdt.c b/cpu/mpc85xx/fdt.c
index 1fae47c..2d36c24 100644
--- a/cpu/mpc85xx/fdt.c
+++ b/cpu/mpc85xx/fdt.c
@@ -80,7 +80,9 @@ void ft_fixup_cpu(void *blob, u64 memory_limit)
 }
 #endif
 
-#ifdef CONFIG_L2_CACHE
+#define ft_fixup_l3cache(x, y)
+
+#if defined(CONFIG_L2_CACHE)
 /* return size in kilobytes */
 static inline u32 l2cache_size(void)
 {
@@ -157,6 +159,66 @@ static inline void ft_fixup_l2cache(void *blob)
 	fdt_setprop_cell(blob, off, "cache-sets", num_sets);
 	fdt_setprop_cell(blob, off, "cache-level", 2);
 	fdt_setprop(blob, off, "compatible", compat_buf, sizeof(compat_buf));
+
+	/* we dont bother w/L3 since no platform of this type has one */
+}
+#elif defined(CONFIG_BACKSIDE_L2_CACHE)
+static inline void ft_fixup_l2cache(void *blob)
+{
+	int off, l2_off, l3_off = -1;
+	u32 *ph;
+	u32 l2cfg0 = mfspr(SPRN_L2CFG0);
+	u32 size, line_size, num_ways, num_sets;
+
+	size = (l2cfg0 & 0x3fff) * 64 * 1024;
+	num_ways = ((l2cfg0 >> 14) & 0x1f) + 1;
+	line_size = (((l2cfg0 >> 23) & 0x3) + 1) * 32;
+	num_sets = size / (line_size * num_ways);
+
+	off = fdt_node_offset_by_prop_value(blob, -1, "device_type", "cpu", 4);
+
+	while (off != -FDT_ERR_NOTFOUND) {
+		ph = (u32 *)fdt_getprop(blob, off, "next-level-cache", 0);
+
+		if (ph == NULL) {
+			debug("no next-level-cache property\n");
+			goto next;
+		}
+
+		l2_off = fdt_node_offset_by_phandle(blob, *ph);
+		if (l2_off < 0) {
+			printf("%s: %s\n", __func__, fdt_strerror(off));
+			goto next;
+		}
+
+		fdt_setprop(blob, l2_off, "cache-unified", NULL, 0);
+		fdt_setprop_cell(blob, l2_off, "cache-block-size", line_size);
+		fdt_setprop_cell(blob, l2_off, "cache-size", size);
+		fdt_setprop_cell(blob, l2_off, "cache-sets", num_sets);
+		fdt_setprop_cell(blob, l2_off, "cache-level", 2);
+		fdt_setprop(blob, l2_off, "compatible", "cache", 6);
+
+		if (l3_off < 0) {
+			ph = (u32 *)fdt_getprop(blob, l2_off, "next-level-cache", 0);
+
+			if (ph == NULL) {
+				debug("no next-level-cache property\n");
+				goto next;
+			}
+			l3_off = *ph;
+		}
+next:
+		off = fdt_node_offset_by_prop_value(blob, off,
+				"device_type", "cpu", 4);
+	}
+	if (l3_off > 0) {
+		l3_off = fdt_node_offset_by_phandle(blob, l3_off);
+		if (l3_off < 0) {
+			printf("%s: %s\n", __func__, fdt_strerror(off));
+			return ;
+		}
+		ft_fixup_l3cache(blob, l3_off);
+	}
 }
 #else
 #define ft_fixup_l2cache(x)
diff --git a/cpu/mpc85xx/release.S b/cpu/mpc85xx/release.S
index 54c936c..fbefc2c 100644
--- a/cpu/mpc85xx/release.S
+++ b/cpu/mpc85xx/release.S
@@ -76,6 +76,22 @@ __secondary_start_page:
 	slwi	r8,r4,5
 	add	r10,r3,r8
 
+#ifdef CONFIG_BACKSIDE_L2_CACHE
+	/* Enable/invalidate the L2 cache */
+	msync
+	lis	r3,L2CSR0_L2FI at h
+	mtspr	SPRN_L2CSR0,r3
+1:
+	mfspr	r3,SPRN_L2CSR0
+	andis.	r1,r3,L2CSR0_L2FI at h
+	bne	1b
+
+	lis	r3,CONFIG_SYS_INIT_L2CSR0 at h
+	ori	r3,r3,CONFIG_SYS_INIT_L2CSR0 at l
+	mtspr	SPRN_L2CSR0,r3
+	isync
+#endif
+
 #define EPAPR_MAGIC		(0x45504150)
 #define ENTRY_ADDR_UPPER	0
 #define ENTRY_ADDR_LOWER	4
diff --git a/cpu/mpc85xx/start.S b/cpu/mpc85xx/start.S
index 80f9677..89eea8c 100644
--- a/cpu/mpc85xx/start.S
+++ b/cpu/mpc85xx/start.S
@@ -161,7 +161,9 @@ _start_e500:
 #if defined(CONFIG_ENABLE_36BIT_PHYS)
 	ori	r0,r0,HID0_ENMAS7 at l	/* Enable MAS7 */
 #endif
+#ifndef CONFIG_E500MC
 	ori	r0,r0,HID0_TBEN@l	/* Enable Timebase */
+#endif
 	mtspr	HID0,r0
 
 #ifndef CONFIG_E500MC
-- 
1.5.6.6