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authorFlorian Fainelli <florian@openwrt.org>2009-11-02 23:10:14 +0000
committerFlorian Fainelli <florian@openwrt.org>2009-11-02 23:10:14 +0000
commitaf60db77e25ff4a19ee6e8d1e9ebc4e30d9d612b (patch)
treede622f7e53129063fb7388647a1b46ae9f743f88 /target/linux/rdc
parentdca8af905f5ac4f99736917b45b79d8ffdda32ef (diff)
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add cpu identification patch from bifferos
SVN-Revision: 18277
Diffstat (limited to 'target/linux/rdc')
-rw-r--r--target/linux/rdc/patches-2.6.30/010-rdc_cpu_ident.patch176
1 files changed, 176 insertions, 0 deletions
diff --git a/target/linux/rdc/patches-2.6.30/010-rdc_cpu_ident.patch b/target/linux/rdc/patches-2.6.30/010-rdc_cpu_ident.patch
new file mode 100644
index 0000000000..79a6c9495a
--- /dev/null
+++ b/target/linux/rdc/patches-2.6.30/010-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
+@@ -378,6 +378,7 @@ 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
+@@ -121,7 +121,8 @@ 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
+@@ -22,6 +22,7 @@ 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_X86_MCE) += mcheck/
+ obj-$(CONFIG_MTRR) += mtrr/
+--- /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);
++ return;
++ }
++
++ 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);