powerpc/8xxx: query feature reporting register for num cores on unknown cpus
doing so helps avant garde users, such as those using simulators that
allow users to configure the number of cores, so as to not have to
manually adjust u-boot sources. h/w should also be reliably setting
FRR NCPU in the future.
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/cpu/mpc8xxx/cpu.c b/arch/powerpc/cpu/mpc8xxx/cpu.c
index dc3da16..97a94f4 100644
--- a/arch/powerpc/cpu/mpc8xxx/cpu.c
+++ b/arch/powerpc/cpu/mpc8xxx/cpu.c
@@ -110,8 +110,14 @@
}
int cpu_numcores() {
- struct cpu_type *cpu;
- cpu = gd->cpu;
+ ccsr_pic_t __iomem *pic = (void *)CONFIG_SYS_MPC85xx_PIC_ADDR;
+ struct cpu_type *cpu = gd->cpu;
+
+ /* better to query feature reporting register than just assume 1 */
+ if (cpu == &cpu_type_unknown)
+ return ((in_be32(&pic->frr) & MPC85xx_PICFRR_NCPU_MASK) >>
+ MPC85xx_PICFRR_NCPU_SHIFT) + 1;
+
return cpu->num_cores;
}
diff --git a/arch/powerpc/include/asm/immap_85xx.h b/arch/powerpc/include/asm/immap_85xx.h
index f109e8c..c1382c8 100644
--- a/arch/powerpc/include/asm/immap_85xx.h
+++ b/arch/powerpc/include/asm/immap_85xx.h
@@ -760,6 +760,8 @@
u32 eoi; /* End Of IRQ */
u8 res9[3916];
u32 frr; /* Feature Reporting */
+#define MPC85xx_PICFRR_NCPU_MASK 0x00001f00
+#define MPC85xx_PICFRR_NCPU_SHIFT 8
u8 res10[28];
u32 gcr; /* Global Configuration */
#define MPC85xx_PICGCR_RST 0x80000000