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>

arch/powerpc/cpu/mpc8xxx/cpu.c

@@ -110,8 +110,14 @@ struct cpu_type *identify_cpu(u32 ver)
 }
 
 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;
 }
 

arch/powerpc/include/asm/immap_85xx.h

@@ -760,6 +760,8 @@ typedef struct ccsr_pic {
 	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