diff options
Diffstat (limited to 'target/linux/rdc/patches-3.3/010-rdc_cpu_ident.patch')
| -rw-r--r-- | target/linux/rdc/patches-3.3/010-rdc_cpu_ident.patch | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/target/linux/rdc/patches-3.3/010-rdc_cpu_ident.patch b/target/linux/rdc/patches-3.3/010-rdc_cpu_ident.patch new file mode 100644 index 000000000..0f2314a3e --- /dev/null +++ b/target/linux/rdc/patches-3.3/010-rdc_cpu_ident.patch @@ -0,0 +1,176 @@ +--- /dev/null ++++ b/Documentation/x86/rdc.txt +@@ -0,0 +1,69 @@ ++ ++Introduction ++============ ++ ++RDC (http://www.rdc.com.tw) have been manufacturing x86-compatible SoC ++(system-on-chips) for a number of years. They are not the fastest of ++CPUs (clock speeds ranging from 133-150MHz) but 486SX compatibility ++coupled with very low power consumption[1] and low cost make them ideal ++for embedded applications. ++ ++ ++Where to find ++============= ++ ++RDC chips show up in numerous embedded devices, but be careful since ++many of them will not run Linux 2.6 without significant expertise. ++ ++There are several variants of what the linux kernel refers to generically ++as RDC321X: R8610, R321x, S3282 and AMRISC20000. ++ ++R321x: Found in various routers, see the OpenWrt project for details, ++ http://wiki.openwrt.org/oldwiki/rdcport ++ ++R8610: Found on the RDC evaluation board ++ http://www.ivankuten.com/system-on-chip-soc/rdc-r8610/ ++ ++AMRISC20000: Found in the MGB-100 wireless hard disk ++ http://tintuc.no-ip.com/linux/tipps/mgb100/ ++ ++S3282: Found in various NAS devices, including the Bifferboard ++ http://www.bifferos.com ++ ++ ++Kernel Configuration ++==================== ++ ++Add support for this CPU with CONFIG_X86_RDC321X. Ensure that maths ++emulation is included (CONFIG_MATH_EMULATION selected) and avoid MCE ++(CONFIG_X86_MCE not selected). ++ ++ ++CPU detection ++============= ++ ++None of these chips support the cpuid instruction, so as with some ++other x86 compatible SoCs, we must check the north bridge and look ++for specific 'signature' PCI device config. ++ ++The current detection code has been tested only on the Bifferboard ++(S3282 CPU), please send bug reports or success stories with ++other devices to bifferos@yahoo.co.uk. ++ ++ ++Credits ++======= ++ ++Many thanks to RDC for providing the customer codes to allow ++detection of all known variants, without which this detection code ++would have been very hard to ascertain. ++ ++ ++References ++========== ++ ++[1] S3282 in certain NAS solutions consumes less than 1W ++ ++ ++mark@bifferos.com 2009 ++ +--- a/arch/x86/Kconfig ++++ b/arch/x86/Kconfig +@@ -464,6 +464,7 @@ config X86_RDC321X + bool "RDC R-321x SoC" + depends on X86_32 + depends on X86_EXTENDED_PLATFORM ++ select PCI + select M486 + select X86_REBOOTFIXUPS + select EMBEDDED +--- a/arch/x86/include/asm/processor.h ++++ b/arch/x86/include/asm/processor.h +@@ -119,7 +119,8 @@ struct cpuinfo_x86 { + #define X86_VENDOR_CENTAUR 5 + #define X86_VENDOR_TRANSMETA 7 + #define X86_VENDOR_NSC 8 +-#define X86_VENDOR_NUM 9 ++#define X86_VENDOR_RDC 9 ++#define X86_VENDOR_NUM 10 + + #define X86_VENDOR_UNKNOWN 0xff + +--- a/arch/x86/kernel/cpu/Makefile ++++ b/arch/x86/kernel/cpu/Makefile +@@ -26,6 +26,7 @@ obj-$(CONFIG_CPU_SUP_CYRIX_32) += cyrix + obj-$(CONFIG_CPU_SUP_CENTAUR) += centaur.o + obj-$(CONFIG_CPU_SUP_TRANSMETA_32) += transmeta.o + obj-$(CONFIG_CPU_SUP_UMC_32) += umc.o ++obj-$(CONFIG_X86_RDC321X) += rdc.o + + obj-$(CONFIG_PERF_EVENTS) += perf_event.o + +--- /dev/null ++++ b/arch/x86/kernel/cpu/rdc.c +@@ -0,0 +1,69 @@ ++/* ++ * See Documentation/x86/rdc.txt ++ * ++ * mark@bifferos.com ++ */ ++ ++#include <linux/pci.h> ++#include <asm/pci-direct.h> ++#include "cpu.h" ++ ++ ++static void __cpuinit rdc_identify(struct cpuinfo_x86 *c) ++{ ++ u16 vendor, device; ++ u32 customer_id; ++ ++ if (!early_pci_allowed()) ++ return; ++ ++ /* RDC CPU is SoC (system-on-chip), Northbridge is always present */ ++ vendor = read_pci_config_16(0, 0, 0, PCI_VENDOR_ID); ++ device = read_pci_config_16(0, 0, 0, PCI_DEVICE_ID); ++ ++ if (vendor != PCI_VENDOR_ID_RDC || device != PCI_DEVICE_ID_RDC_R6020) ++ return; /* not RDC */ ++ /* ++ * NB: We could go on and check other devices, e.g. r6040 NIC, but ++ * that's probably overkill ++ */ ++ ++ customer_id = read_pci_config(0, 0, 0, 0x90); ++ ++ switch (customer_id) { ++ /* id names are from RDC */ ++ case 0x00321000: ++ strcpy(c->x86_model_id, "R3210/R3211"); ++ break; ++ case 0x00321001: ++ strcpy(c->x86_model_id, "AMITRISC20000/20010"); ++ break; ++ case 0x00321002: ++ strcpy(c->x86_model_id, "R3210X/Edimax"); ++ break; ++ case 0x00321003: ++ strcpy(c->x86_model_id, "R3210/Kcodes"); ++ break; ++ case 0x00321004: /* tested */ ++ strcpy(c->x86_model_id, "S3282/CodeTek"); ++ break; ++ case 0x00321007: ++ strcpy(c->x86_model_id, "R8610"); ++ break; ++ default: ++ pr_info("RDC CPU: Unrecognised Customer ID (0x%x) please report to linux-kernel@vger.kernel.org\n", customer_id); ++ break; ++ } ++ ++ strcpy(c->x86_vendor_id, "RDC"); ++ c->x86_vendor = X86_VENDOR_RDC; ++} ++ ++static const struct cpu_dev __cpuinitconst rdc_cpu_dev = { ++ .c_vendor = "RDC", ++ .c_ident = { "RDC" }, ++ .c_identify = rdc_identify, ++ .c_x86_vendor = X86_VENDOR_RDC, ++}; ++ ++cpu_dev_register(rdc_cpu_dev); |