powerpc/p4080: Add support for CPC(Corenet platform cache) on CoreNet platforms

The CoreNet style platforms can have a L3 cache that fronts the memory
controllers.  Enable that cache as well as add information into the
device tree about it.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Dave Liu <daveliu@freescale.com>
Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Signed-off-by: Roy Zang <tie-fei.zang@freescale.com>
Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

2 files changed, 68 insertions, 1 deletions

diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c b/arch/powerpc/cpu/mpc85xx/cpu_init.c
index 5d5b4c2963..a90ebb1050 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c
@@ -127,6 +127,44 @@ void config_8560_ioports (volatile ccsr_cpm_t * cpm)
 }
 #endif
 
+#ifdef CONFIG_SYS_FSL_CPC
+static void enable_cpc(void)
+{
+	int i;
+	u32 size = 0;
+
+	cpc_corenet_t *cpc = (cpc_corenet_t *)CONFIG_SYS_FSL_CPC_ADDR;
+
+	for (i = 0; i < CONFIG_SYS_NUM_CPC; i++, cpc++) {
+		u32 cpccfg0 = in_be32(&cpc->cpccfg0);
+		size += CPC_CFG0_SZ_K(cpccfg0);
+
+		out_be32(&cpc->cpccsr0, CPC_CSR0_CE | CPC_CSR0_PE);
+		/* Read back to sync write */
+		in_be32(&cpc->cpccsr0);
+
+	}
+
+	printf("Corenet Platform Cache: %d KB enabled\n", size);
+}
+
+void invalidate_cpc(void)
+{
+	int i;
+	cpc_corenet_t *cpc = (cpc_corenet_t *)CONFIG_SYS_FSL_CPC_ADDR;
+
+	for (i = 0; i < CONFIG_SYS_NUM_CPC; i++, cpc++) {
+		/* Flash invalidate the CPC and clear all the locks */
+		out_be32(&cpc->cpccsr0, CPC_CSR0_FI | CPC_CSR0_LFC);
+		while (in_be32(&cpc->cpccsr0) & (CPC_CSR0_FI | CPC_CSR0_LFC))
+			;
+	}
+}
+#else
+#define enable_cpc()
+#define invalidate_cpc()
+#endif /* CONFIG_SYS_FSL_CPC */
+
 /*
  * Breathe some life into the CPU...
  *
@@ -188,6 +226,9 @@ void cpu_init_f (void)
 	corenet_tb_init();
 #endif
 	init_used_tlb_cams();
+
+	/* Invalidate the CPC before DDR gets enabled */
+	invalidate_cpc();
 }
 
 
@@ -198,7 +239,6 @@ void cpu_init_f (void)
  * use the same bit-encoding as the older 8555, etc, parts.
  *
  */
-
 int cpu_init_r(void)
 {
 #ifdef CONFIG_SYS_LBC_LCRR
@@ -319,6 +359,9 @@ int cpu_init_r(void)
 #else
 	puts("disabled\n");
 #endif
+
+	enable_cpc();
+
 #ifdef CONFIG_QE
 	uint qe_base = CONFIG_SYS_IMMR + 0x00080000; /* QE immr base */
 	qe_init(qe_base);
diff --git a/arch/powerpc/cpu/mpc85xx/fdt.c b/arch/powerpc/cpu/mpc85xx/fdt.c
index 932466e883..6c5fb36a36 100644
--- a/arch/powerpc/cpu/mpc85xx/fdt.c
+++ b/arch/powerpc/cpu/mpc85xx/fdt.c
@@ -28,6 +28,7 @@
 #include <fdt_support.h>
 #include <asm/processor.h>
 #include <linux/ctype.h>
+#include <asm/io.h>
 #ifdef CONFIG_FSL_ESDHC
 #include <fsl_esdhc.h>
 #endif
@@ -80,7 +81,30 @@ void ft_fixup_cpu(void *blob, u64 memory_limit)
 }
 #endif
 
+#ifdef CONFIG_SYS_FSL_CPC
+static inline void ft_fixup_l3cache(void *blob, int off)
+{
+	u32 line_size, num_ways, size, num_sets;
+	cpc_corenet_t *cpc = (void *)CONFIG_SYS_FSL_CPC_ADDR;
+	u32 cfg0 = in_be32(&cpc->cpccfg0);
+
+	size = CPC_CFG0_SZ_K(cfg0) * 1024 * CONFIG_SYS_NUM_CPC;
+	num_ways = CPC_CFG0_NUM_WAYS(cfg0);
+	line_size = CPC_CFG0_LINE_SZ(cfg0);
+	num_sets = size / (line_size * num_ways);
+
+	fdt_setprop(blob, off, "cache-unified", NULL, 0);
+	fdt_setprop_cell(blob, off, "cache-block-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", 3);
+#ifdef CONFIG_SYS_CACHE_STASHING
+	fdt_setprop_cell(blob, off, "cache-stash-id", 1);
+#endif
+}
+#else
 #define ft_fixup_l3cache(x, y)
+#endif
 
 #if defined(CONFIG_L2_CACHE)
 /* return size in kilobytes */