[U-Boot] [PATCH 6/6] powerpc/mpc8xxx: fix core id for multicore booting

[York Sun]

For the cores with multiple threads, we need to figure out which physical
core a thread belongs. To match the core ids, update PIR registers and
spin tables.

Signed-off-by: York Sun <yorksun at freescale.com>
Signed-off-by: Kumar Gala <galak at kernel.crashing.org>
---
 arch/powerpc/cpu/mpc85xx/fdt.c     |    5 ++-
 arch/powerpc/cpu/mpc85xx/release.S |   45 +++++++++++++++++++++++++++++++++--
 arch/powerpc/cpu/mpc8xxx/fdt.c     |    3 +-
 arch/powerpc/include/asm/mp.h      |    6 ++++
 4 files changed, 53 insertions(+), 6 deletions(-)

diff --git a/arch/powerpc/cpu/mpc85xx/fdt.c b/arch/powerpc/cpu/mpc85xx/fdt.c
index 21c3ad4..40df01c 100644
--- a/arch/powerpc/cpu/mpc85xx/fdt.c
+++ b/arch/powerpc/cpu/mpc85xx/fdt.c
@@ -57,8 +57,9 @@ void ft_fixup_cpu(void *blob, u64 memory_limit)
 		u32 *reg = (u32 *)fdt_getprop(blob, off, "reg", 0);
 
 		if (reg) {
-			u64 val = *reg * SIZE_BOOT_ENTRY + spin_tbl_addr;
-			val = cpu_to_fdt32(val);
+			u32 phys_cpu_id = thread_to_core(*reg);
+			u64 val = phys_cpu_id * SIZE_BOOT_ENTRY + spin_tbl_addr;
+			val = cpu_to_fdt64(val);
 			if (*reg == id) {
 				fdt_setprop_string(blob, off, "status",
 								"okay");
diff --git a/arch/powerpc/cpu/mpc85xx/release.S b/arch/powerpc/cpu/mpc85xx/release.S
index 043d0ff..22e73e0 100644
--- a/arch/powerpc/cpu/mpc85xx/release.S
+++ b/arch/powerpc/cpu/mpc85xx/release.S
@@ -1,5 +1,5 @@
 /*
- * Copyright 2008-2011 Freescale Semiconductor, Inc.
+ * Copyright 2008-2012 Freescale Semiconductor, Inc.
  * Kumar Gala <kumar.gala at freescale.com>
  *
  * See file CREDITS for list of people who contributed to this
@@ -155,7 +155,27 @@ __secondary_start_page:
 
 	/* r10 has the base address for the entry */
 	mfspr	r0,SPRN_PIR
-#ifdef CONFIG_E500MC
+#if	defined(CONFIG_E6500)
+/*
+ * PIR definition for E6500
+ * 0-17 Reserved (logic 0s)
+ * 8-19 CHIP_ID,    2’b00      - SoC 1
+ *                  all others - reserved
+ * 20-24 CLUSTER_ID 5’b00000   - CCM 1
+ *                  all others - reserved
+ * 25-26 CORE_CLUSTER_ID 2’b00 - cluster 1
+ *                       2’b01 - cluster 2
+ *                       2’b10 - cluster 3
+ *                       2’b11 - cluster 4
+ * 27-28 CORE_ID         2’b00 - core 0
+ *                       2’b01 - core 1
+ *                       2’b10 - core 2
+ *                       2’b11 - core 3
+ * 29-31 THREAD_ID       3’b000 - thread 0
+ *                       3’b001 - thread 1
+ */
+	rlwinm  r4,r0,29,25,31
+#elif	defined(CONFIG_E500MC)
 	rlwinm	r4,r0,27,27,31
 #else
 	mr	r4,r0
@@ -170,6 +190,25 @@ __secondary_start_page:
 	mtspr	L1CSR2,r8
 #endif
 
+#ifdef CONFIG_E6500
+	mfspr	r0,SPRN_PIR
+	/*
+	 * core 0 thread 0: pir reset value 0x00, new pir 0
+	 * core 0 thread 1: pir reset value 0x01, new pir 1
+	 * core 1 thread 0: pir reset value 0x08, new pir 2
+	 * core 1 thread 1: pir reset value 0x09, new pir 3
+	 * core 2 thread 0: pir reset value 0x10, new pir 4
+	 * core 2 thread 1: pir reset value 0x11, new pir 5
+	 * etc.
+	 *
+	 * Only thread 0 of each core will be running, updating PIR doesn't
+	 * need to deal with the thread bits.
+	 */
+	rlwinm	r4,r0,30,24,30
+#endif
+
+	mtspr	SPRN_PIR,r4	/* write to PIR register */
+
 #if defined(CONFIG_SYS_P4080_ERRATUM_CPU22) || \
 	defined(CONFIG_SYS_FSL_ERRATUM_NMG_CPU_A011)
 	/*
@@ -253,7 +292,7 @@ __secondary_start_page:
 	/* setup the entry */
 	li	r3,0
 	li	r8,1
-	stw	r0,ENTRY_PIR(r10)
+	stw	r4,ENTRY_PIR(r10)
 	stw	r3,ENTRY_ADDR_UPPER(r10)
 	stw	r8,ENTRY_ADDR_LOWER(r10)
 	stw	r3,ENTRY_R3_UPPER(r10)
diff --git a/arch/powerpc/cpu/mpc8xxx/fdt.c b/arch/powerpc/cpu/mpc8xxx/fdt.c
index 09810be..32ab050 100644
--- a/arch/powerpc/cpu/mpc8xxx/fdt.c
+++ b/arch/powerpc/cpu/mpc8xxx/fdt.c
@@ -62,8 +62,9 @@ void ft_fixup_num_cores(void *blob) {
 	off = fdt_node_offset_by_prop_value(blob, -1, "device_type", "cpu", 4);
 	while (off != -FDT_ERR_NOTFOUND) {
 		u32 *reg = (u32 *)fdt_getprop(blob, off, "reg", 0);
+		u32 phys_cpu_id = thread_to_core(*reg);
 
-		if (!is_core_valid(*reg) || is_core_disabled(*reg)) {
+		if (!is_core_valid(phys_cpu_id) || is_core_disabled(phys_cpu_id)) {
 			int ph = fdt_get_phandle(blob, off);
 
 			/* Delete the cpu node once there are no cpu handles */
diff --git a/arch/powerpc/include/asm/mp.h b/arch/powerpc/include/asm/mp.h
index 3ffa30b..fe490ba 100644
--- a/arch/powerpc/include/asm/mp.h
+++ b/arch/powerpc/include/asm/mp.h
@@ -28,4 +28,10 @@ void cpu_mp_lmb_reserve(struct lmb *lmb);
 u32 determine_mp_bootpg(void);
 int is_core_disabled(int nr);
 
+#ifdef CONFIG_E6500
+#define thread_to_core(x) (x >> 1)
+#else
+#define thread_to_core(x) (x)
+#endif
+
 #endif
-- 
1.7.0.4