[U-Boot-Users] [PATCH] 85xx: Add setting of cache props in the device tree.

[Kumar Gala]

Signed-off-by: Kumar Gala <galak at kernel.crashing.org>
---
 cpu/mpc85xx/fdt.c |  128 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 128 insertions(+), 0 deletions(-)

diff --git a/cpu/mpc85xx/fdt.c b/cpu/mpc85xx/fdt.c
index bb87740..92952e6 100644
--- a/cpu/mpc85xx/fdt.c
+++ b/cpu/mpc85xx/fdt.c
@@ -26,6 +26,7 @@
 #include <common.h>
 #include <libfdt.h>
 #include <fdt_support.h>
+#include <asm/processor.h>

 extern void ft_qe_setup(void *blob);
 #ifdef CONFIG_MP
@@ -77,6 +78,131 @@ void ft_fixup_cpu(void *blob, u64 memory_limit)
 }
 #endif

+#ifdef CONFIG_L2_CACHE
+/* return size in kilobytes */
+static inline u32 l2cache_size(void)
+{
+	volatile ccsr_l2cache_t *l2cache = (void *)CFG_MPC85xx_L2_ADDR;
+	volatile u32 l2siz_field = (l2cache->l2ctl >> 28) & 0x3;
+	u32 ver = SVR_SOC_VER(get_svr());
+
+	switch (l2siz_field) {
+	case 0x0:
+		break;
+	case 0x1:
+		if (ver == SVR_8540 || ver == SVR_8560   ||
+		    ver == SVR_8541 || ver == SVR_8541_E ||
+		    ver == SVR_8555 || ver == SVR_8555_E)
+			return 128;
+		else
+			return 256;
+		break;
+	case 0x2:
+		if (ver == SVR_8540 || ver == SVR_8560   ||
+		    ver == SVR_8541 || ver == SVR_8541_E ||
+		    ver == SVR_8555 || ver == SVR_8555_E)
+			return 256;
+		else
+			return 512;
+		break;
+	case 0x3:
+		return 1024;
+		break;
+	}
+
+	return 0;
+}
+
+static inline void ft_fixup_l2cache(void *blob)
+{
+	int len, off;
+	u32 *ph;
+	struct cpu_type *cpu = identify_cpu(SVR_SOC_VER(get_svr()));
+	char compat_buf[38];
+
+	const u32 line_size = 32;
+	const u32 num_ways = 8;
+	const u32 size = l2cache_size() * 1024;
+	const u32 num_sets = size / (line_size * num_ways);
+
+	off = fdt_node_offset_by_prop_value(blob, -1, "device_type", "cpu", 4);
+	if (off < 0) {
+		debug("no cpu node fount\n");
+		return;
+	}
+
+	ph = (u32 *)fdt_getprop(blob, off, "next-level-cache", 0);
+
+	if (ph == NULL) {
+		debug("no next-level-cache property\n");
+		return ;
+	}
+
+	off = fdt_node_offset_by_phandle(blob, *ph);
+	if (off < 0) {
+		printf("%s: %s\n", __func__, fdt_strerror(off));
+		return ;
+	}
+
+	if (cpu) {
+		len = sprintf(compat_buf, "fsl,mpc%s-l2-cache-controller",
+				cpu->name);
+		sprintf(&compat_buf[len + 1], "cache");
+	}
+	fdt_setprop(blob, off, "cache-unified", NULL, 0);
+	fdt_setprop_cell(blob, off, "cache-block-size", line_size);
+	fdt_setprop_cell(blob, off, "cache-line-size", line_size);
+	fdt_setprop_cell(blob, off, "cache-size", size);
+	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));
+}
+#else
+#define ft_fixup_l2cache(x)
+#endif
+
+static inline void ft_fixup_cache(void *blob)
+{
+	int off;
+
+	off = fdt_node_offset_by_prop_value(blob, -1, "device_type", "cpu", 4);
+
+	while (off != -FDT_ERR_NOTFOUND) {
+		u32 l1cfg0 = mfspr(SPRN_L1CFG0);
+		u32 l1cfg1 = mfspr(SPRN_L1CFG1);
+		u32 isize, iline_size, inum_sets, inum_ways;
+		u32 dsize, dline_size, dnum_sets, dnum_ways;
+
+		/* d-side config */
+		dsize = (l1cfg0 & 0x7ff) * 1024;
+		dnum_ways = ((l1cfg0 >> 11) & 0xff) + 1;
+		dline_size = (((l1cfg0 >> 23) & 0x3) + 1) * 32;
+		dnum_sets = dsize / (dline_size * dnum_ways);
+
+		fdt_setprop_cell(blob, off, "d-cache-block-size", dline_size);
+		fdt_setprop_cell(blob, off, "d-cache-line-size", dline_size);
+		fdt_setprop_cell(blob, off, "d-cache-size", dsize);
+		fdt_setprop_cell(blob, off, "d-cache-sets", dnum_sets);
+
+		/* i-side config */
+		isize = (l1cfg1 & 0x7ff) * 1024;
+		inum_ways = ((l1cfg1 >> 11) & 0xff) + 1;
+		iline_size = (((l1cfg1 >> 23) & 0x3) + 1) * 32;
+		inum_sets = isize / (iline_size * inum_ways);
+
+		fdt_setprop_cell(blob, off, "i-cache-block-size", iline_size);
+		fdt_setprop_cell(blob, off, "i-cache-line-size", iline_size);
+		fdt_setprop_cell(blob, off, "i-cache-size", isize);
+		fdt_setprop_cell(blob, off, "i-cache-sets", inum_sets);
+
+		off = fdt_node_offset_by_prop_value(blob, off,
+				"device_type", "cpu", 4);
+	}
+
+	ft_fixup_l2cache(blob);
+}
+
+
 void ft_cpu_setup(void *blob, bd_t *bd)
 {
 #if defined(CONFIG_HAS_ETH0) || defined(CONFIG_HAS_ETH1) ||\
@@ -114,4 +240,6 @@ void ft_cpu_setup(void *blob, bd_t *bd)
 #ifdef CONFIG_MP
 	ft_fixup_cpu(blob, (u64)bd->bi_memstart + (u64)bd->bi_memsize);
 #endif
+
+	ft_fixup_cache(blob);
 }
-- 
1.5.4.5