From d1dfc35d3a62122b85ca975b80dcbf4a0da0bebc Mon Sep 17 00:00:00 2001 From: Valentine Barshak Date: Fri, 26 Oct 2007 04:16:40 +1000 Subject: [POWERPC] 4xx: Workaround for the 440EP(x)/GR(x) processors identical PVR issue. PowerPC 440EP(x) 440GR(x) processors have the same PVR values, since they have identical cores. However, FPU is not supported on GR(x) and enabling APU instruction broadcast in the CCR0 register (to enable FPU) may cause unpredictable results. There's no safe way to detect FPU support at runtime. This patch provides a workarund for the issue. We use a POWER6 "logical PVR approach". First, we identify all EP(x) and GR(x) processors as GR(x) ones (which is safe). Then we check the device tree cpu path. If we have a EP(x) processor entry, we call identify_cpu again with PVR | 0x8. This bit is always 0 in the real PVR. This way we enable FPU only for 440EP(x). Signed-off-by: Valentine Barshak Signed-off-by: Josh Boyer --- arch/powerpc/kernel/prom.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'arch/powerpc/kernel/prom.c') diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index 9f329a8928e..acc0d247d3c 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -697,6 +697,18 @@ static int __init early_init_dt_scan_cpus(unsigned long node, prop = of_get_flat_dt_prop(node, "cpu-version", NULL); if (prop && (*prop & 0xff000000) == 0x0f000000) identify_cpu(0, *prop); +#if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU) + /* + * Since 440GR(x)/440EP(x) processors have the same pvr, + * we check the node path and set bit 28 in the cur_cpu_spec + * pvr for EP(x) processor version. This bit is always 0 in + * the "real" pvr. Then we call identify_cpu again with + * the new logical pvr to enable FPU support. + */ + if (strstr(uname, "440EP")) { + identify_cpu(0, cur_cpu_spec->pvr_value | 0x8); + } +#endif } check_cpu_feature_properties(node); -- cgit v1.2.3-18-g5258