[U-Boot] [PATCH] ppc/8xxx: Add is_core_disabled to remove disabled cores from dtb

[Kumar Gala]

If we explicitly disabled a core remove it from the dtb we pass on to
the kernel.

Signed-off-by: Kumar Gala <galak at kernel.crashing.org>
---
 arch/powerpc/cpu/mpc85xx/mp.c  |   25 +++++++++++++++++++++++++
 arch/powerpc/cpu/mpc86xx/mp.c  |   19 +++++++++++++++++++
 arch/powerpc/cpu/mpc8xxx/fdt.c |    3 ++-
 arch/powerpc/include/asm/mp.h  |    3 ++-
 4 files changed, 48 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/cpu/mpc85xx/mp.c b/arch/powerpc/cpu/mpc85xx/mp.c
index 826bf32..0d39f3b 100644
--- a/arch/powerpc/cpu/mpc85xx/mp.c
+++ b/arch/powerpc/cpu/mpc85xx/mp.c
@@ -77,6 +77,13 @@ int cpu_disable(int nr)
 
 	return 0;
 }
+
+int is_core_disabled(int nr) {
+	volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
+	u32 coredisrl = in_be32(&gur->coredisrl);
+
+	return (coredisrl & (1 << nr));
+}
 #else
 int cpu_disable(int nr)
 {
@@ -96,6 +103,24 @@ int cpu_disable(int nr)
 
 	return 0;
 }
+
+int is_core_disabled(int nr) {
+	volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
+	u32 devdisr = in_be32(&gur->devdisr);
+
+	switch (nr) {
+	case 0:
+		return (devdisr & MPC85xx_DEVDISR_CPU0);
+		break;
+	case 1:
+		return (devdisr & MPC85xx_DEVDISR_CPU1);
+		break;
+	default:
+		printf("Invalid cpu number for disable %d\n", nr);
+	}
+
+	return 0;
+}
 #endif
 
 static u8 boot_entry_map[4] = {
diff --git a/arch/powerpc/cpu/mpc86xx/mp.c b/arch/powerpc/cpu/mpc86xx/mp.c
index b4a0faa..97e4692 100644
--- a/arch/powerpc/cpu/mpc86xx/mp.c
+++ b/arch/powerpc/cpu/mpc86xx/mp.c
@@ -66,6 +66,25 @@ int cpu_disable(int nr)
 	return 0;
 }
 
+int is_core_disabled(int nr) {
+	volatile immap_t *immap = (immap_t *) CONFIG_SYS_CCSRBAR;
+	volatile ccsr_gur_t *gur = &immap->im_gur;
+	u32 devdisr = in_be32(&gur->devdisr);
+
+	switch (nr) {
+	case 0:
+		return (devdisr & MPC86xx_DEVDISR_CPU0);
+		break;
+	case 1:
+		return (devdisr & MPC86xx_DEVDISR_CPU1);
+		break;
+	default:
+		printf("Invalid cpu number for disable %d\n", nr);
+	}
+
+	return 0;
+}
+
 int cpu_release(int nr, int argc, char *argv[])
 {
 	/* dummy function so common/cmd_mp.c will build
diff --git a/arch/powerpc/cpu/mpc8xxx/fdt.c b/arch/powerpc/cpu/mpc8xxx/fdt.c
index c9956b6..02bdb70 100644
--- a/arch/powerpc/cpu/mpc8xxx/fdt.c
+++ b/arch/powerpc/cpu/mpc8xxx/fdt.c
@@ -26,6 +26,7 @@
 #include <common.h>
 #include <libfdt.h>
 #include <fdt_support.h>
+#include <asm/mp.h>
 
 #if defined(CONFIG_MPC85xx) || defined(CONFIG_MPC86xx)
 static int ft_del_cpuhandle(void *blob, int cpuhandle)
@@ -57,7 +58,7 @@ void ft_fixup_num_cores(void *blob) {
 	while (off != -FDT_ERR_NOTFOUND) {
 		u32 *reg = (u32 *)fdt_getprop(blob, off, "reg", 0);
 
-		if (*reg > num_cores-1) {
+		if ((*reg > num_cores-1) || (is_core_disabled(*reg))) {
 			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 5388c95..3ffa30b 100644
--- a/arch/powerpc/include/asm/mp.h
+++ b/arch/powerpc/include/asm/mp.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2009 Freescale Semiconductor, Inc.
+ * Copyright 2009-2010 Freescale Semiconductor, Inc.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
@@ -26,5 +26,6 @@
 void setup_mp(void);
 void cpu_mp_lmb_reserve(struct lmb *lmb);
 u32 determine_mp_bootpg(void);
+int is_core_disabled(int nr);
 
 #endif
-- 
1.6.0.6