[rdc] add cpu identification patch from bifferos

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@18277 3c298f89-4303-0410-b956-a3cf2f4a3e73

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 (file)
index 0000000..79a6c94
--- /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);