diff options
author | Timur Tabi <timur@freescale.com> | 2011-08-05 16:15:24 -0500 |
---|---|---|
committer | Kumar Gala <galak@kernel.crashing.org> | 2011-09-29 19:01:05 -0500 |
commit | fbb9ecf7493fbd6b8c8af7d52e90c915459f7040 (patch) | |
tree | b19bce4d9c77be58fc1aba43bd73625222c99f8f /arch/powerpc/cpu/mpc8xxx/cpu.c | |
parent | 86df5142a14868ea0e24511f4293d43a611a2b39 (diff) |
powerpc/mp: add support for discontiguous cores
Some SOCs have discontiguously-numbered cores, and so we can't determine the
valid core numbers via the FRR register any more. We define
CPU_TYPE_ENTRY_MASK to specify a discontiguous core mask, and helper functions
to process the mask and enumerate over the set of valid cores.
Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/cpu/mpc8xxx/cpu.c')
-rw-r--r-- | arch/powerpc/cpu/mpc8xxx/cpu.c | 36 |
1 files changed, 34 insertions, 2 deletions
diff --git a/arch/powerpc/cpu/mpc8xxx/cpu.c b/arch/powerpc/cpu/mpc8xxx/cpu.c index 767bc524d1c..bb572cfff13 100644 --- a/arch/powerpc/cpu/mpc8xxx/cpu.c +++ b/arch/powerpc/cpu/mpc8xxx/cpu.c @@ -129,13 +129,33 @@ struct cpu_type *identify_cpu(u32 ver) return &cpu_type_unknown; } +#define MPC8xxx_PICFRR_NCPU_MASK 0x00001f00 +#define MPC8xxx_PICFRR_NCPU_SHIFT 8 + +/* + * Return a 32-bit mask indicating which cores are present on this SOC. + */ +u32 cpu_mask() +{ + ccsr_pic_t __iomem *pic = (void *)CONFIG_SYS_MPC8xxx_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) & MPC8xxx_PICFRR_NCPU_MASK) >> + MPC8xxx_PICFRR_NCPU_SHIFT) + 1; + + return cpu->mask; +} + +/* + * Return the number of cores on this SOC. + */ int cpu_numcores() { ccsr_pic_t __iomem *pic = (void *)CONFIG_SYS_MPC8xxx_PIC_ADDR; struct cpu_type *cpu = gd->cpu; /* better to query feature reporting register than just assume 1 */ -#define MPC8xxx_PICFRR_NCPU_MASK 0x00001f00 -#define MPC8xxx_PICFRR_NCPU_SHIFT 8 if (cpu == &cpu_type_unknown) return ((in_be32(&pic->frr) & MPC8xxx_PICFRR_NCPU_MASK) >> MPC8xxx_PICFRR_NCPU_SHIFT) + 1; @@ -143,6 +163,18 @@ int cpu_numcores() { return cpu->num_cores; } +/* + * Check if the given core ID is valid + * + * Returns zero if it isn't, 1 if it is. + */ +int is_core_valid(unsigned int core) +{ + struct cpu_type *cpu = gd->cpu; + + return !!((1 << core) & cpu->mask); +} + int probecpu (void) { uint svr; |