diff options
Diffstat (limited to 'arch/powerpc/kernel/prom.c')
| -rw-r--r-- | arch/powerpc/kernel/prom.c | 110 |
1 files changed, 76 insertions, 34 deletions
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index 16d29d16b96..c18dbe77fdc 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -538,35 +538,31 @@ static struct ibm_pa_feature { {CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0}, }; -static void __init check_cpu_pa_features(unsigned long node) +static void __init scan_features(unsigned long node, unsigned char *ftrs, + unsigned long tablelen, + struct ibm_pa_feature *fp, + unsigned long ft_size) { - unsigned char *pa_ftrs; - unsigned long len, tablelen, i, bit; - - pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen); - if (pa_ftrs == NULL) - return; + unsigned long i, len, bit; /* find descriptor with type == 0 */ for (;;) { if (tablelen < 3) return; - len = 2 + pa_ftrs[0]; + len = 2 + ftrs[0]; if (tablelen < len) return; /* descriptor 0 not found */ - if (pa_ftrs[1] == 0) + if (ftrs[1] == 0) break; tablelen -= len; - pa_ftrs += len; + ftrs += len; } /* loop over bits we know about */ - for (i = 0; i < ARRAY_SIZE(ibm_pa_features); ++i) { - struct ibm_pa_feature *fp = &ibm_pa_features[i]; - - if (fp->pabyte >= pa_ftrs[0]) + for (i = 0; i < ft_size; ++i, ++fp) { + if (fp->pabyte >= ftrs[0]) continue; - bit = (pa_ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1; + bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1; if (bit ^ fp->invert) { cur_cpu_spec->cpu_features |= fp->cpu_features; cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs; @@ -577,16 +573,59 @@ static void __init check_cpu_pa_features(unsigned long node) } } +static void __init check_cpu_pa_features(unsigned long node) +{ + unsigned char *pa_ftrs; + unsigned long tablelen; + + pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen); + if (pa_ftrs == NULL) + return; + + scan_features(node, pa_ftrs, tablelen, + ibm_pa_features, ARRAY_SIZE(ibm_pa_features)); +} + +static struct feature_property { + const char *name; + u32 min_value; + unsigned long cpu_feature; + unsigned long cpu_user_ftr; +} feature_properties[] __initdata = { +#ifdef CONFIG_ALTIVEC + {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, + {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, +#endif /* CONFIG_ALTIVEC */ +#ifdef CONFIG_PPC64 + {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP}, + {"ibm,purr", 1, CPU_FTR_PURR, 0}, + {"ibm,spurr", 1, CPU_FTR_SPURR, 0}, +#endif /* CONFIG_PPC64 */ +}; + +static void __init check_cpu_feature_properties(unsigned long node) +{ + unsigned long i; + struct feature_property *fp = feature_properties; + const u32 *prop; + + for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) { + prop = of_get_flat_dt_prop(node, fp->name, NULL); + if (prop && *prop >= fp->min_value) { + cur_cpu_spec->cpu_features |= fp->cpu_feature; + cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr; + } + } +} + static int __init early_init_dt_scan_cpus(unsigned long node, const char *uname, int depth, void *data) { static int logical_cpuid = 0; char *type = of_get_flat_dt_prop(node, "device_type", NULL); -#ifdef CONFIG_ALTIVEC - u32 *prop; -#endif - u32 *intserv; + const u32 *prop; + const u32 *intserv; int i, nthreads; unsigned long len; int found = 0; @@ -643,24 +682,27 @@ static int __init early_init_dt_scan_cpus(unsigned long node, intserv[i]); boot_cpuid = logical_cpuid; set_hard_smp_processor_id(boot_cpuid, intserv[i]); - } -#ifdef CONFIG_ALTIVEC - /* Check if we have a VMX and eventually update CPU features */ - prop = (u32 *)of_get_flat_dt_prop(node, "ibm,vmx", NULL); - if (prop && (*prop) > 0) { - cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC; - cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC; - } - - /* Same goes for Apple's "altivec" property */ - prop = (u32 *)of_get_flat_dt_prop(node, "altivec", NULL); - if (prop) { - cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC; - cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC; + /* + * PAPR defines "logical" PVR values for cpus that + * meet various levels of the architecture: + * 0x0f000001 Architecture version 2.04 + * 0x0f000002 Architecture version 2.05 + * If the cpu-version property in the cpu node contains + * such a value, we call identify_cpu again with the + * logical PVR value in order to use the cpu feature + * bits appropriate for the architecture level. + * + * A POWER6 partition in "POWER6 architected" mode + * uses the 0x0f000002 PVR value; in POWER5+ mode + * it uses 0x0f000001. + */ + prop = of_get_flat_dt_prop(node, "cpu-version", NULL); + if (prop && (*prop & 0xff000000) == 0x0f000000) + identify_cpu(0, *prop); } -#endif /* CONFIG_ALTIVEC */ + check_cpu_feature_properties(node); check_cpu_pa_features(node); #ifdef CONFIG_PPC_PSERIES |