target/linux/rdc/patches-2.6.32/010-rdc_cpu_ident.patch

   1 --- /dev/null
   2 +++ b/Documentation/x86/rdc.txt
   3 @@ -0,0 +1,69 @@
   4 +
   5 +Introduction
   6 +============
   7 +
   8 +RDC (http://www.rdc.com.tw) have been manufacturing x86-compatible SoC
   9 +(system-on-chips) for a number of years.  They are not the fastest of
  10 +CPUs (clock speeds ranging from 133-150MHz) but 486SX compatibility
  11 +coupled with very low power consumption[1] and low cost make them ideal
  12 +for embedded applications.
  13 +
  14 +
  15 +Where to find
  16 +=============
  17 +
  18 +RDC chips show up in numerous embedded devices, but be careful since
  19 +many of them will not run Linux 2.6 without significant expertise.
  20 +
  21 +There are several variants of what the linux kernel refers to generically
  22 +as RDC321X:  R8610, R321x, S3282 and AMRISC20000.
  23 +
  24 +R321x: Found in various routers, see the OpenWrt project for details,
  25 +   http://wiki.openwrt.org/oldwiki/rdcport
  26 +
  27 +R8610: Found on the RDC evaluation board
  28 +   http://www.ivankuten.com/system-on-chip-soc/rdc-r8610/
  29 +
  30 +AMRISC20000: Found in the MGB-100 wireless hard disk
  31 +   http://tintuc.no-ip.com/linux/tipps/mgb100/
  32 +
  33 +S3282: Found in various NAS devices, including the Bifferboard
  34 +   http://www.bifferos.com
  35 +
  36 +
  37 +Kernel Configuration
  38 +====================
  39 +
  40 +Add support for this CPU with CONFIG_X86_RDC321X.  Ensure that maths
  41 +emulation is included (CONFIG_MATH_EMULATION selected) and avoid MCE
  42 +(CONFIG_X86_MCE not selected).
  43 +
  44 +
  45 +CPU detection
  46 +=============
  47 +
  48 +None of these chips support the cpuid instruction, so as with some
  49 +other x86 compatible SoCs, we must check the north bridge and look
  50 +for specific 'signature' PCI device config.
  51 +
  52 +The current detection code has been tested only on the Bifferboard
  53 +(S3282 CPU), please send bug reports or success stories with
  54 +other devices to bifferos@yahoo.co.uk.
  55 +
  56 +
  57 +Credits
  58 +=======
  59 +
  60 +Many thanks to RDC for providing the customer codes to allow
  61 +detection of all known variants, without which this detection code
  62 +would have been very hard to ascertain.
  63 +
  64 +
  65 +References
  66 +==========
  67 +
  68 +[1] S3282 in certain NAS solutions consumes less than 1W
  69 +
  70 +
  71 +mark@bifferos.com 2009
  72 +
  73 --- a/arch/x86/Kconfig
  74 +++ b/arch/x86/Kconfig
  75 @@ -403,6 +403,7 @@ config X86_RDC321X
  76         bool "RDC R-321x SoC"
  77         depends on X86_32
  78         depends on X86_EXTENDED_PLATFORM
  79 +       select PCI
  80         select M486
  81         select X86_REBOOTFIXUPS
  82         select EMBEDDED
  83 --- a/arch/x86/include/asm/processor.h
  84 +++ b/arch/x86/include/asm/processor.h
  85 @@ -122,7 +122,8 @@ struct cpuinfo_x86 {
  86  #define X86_VENDOR_CENTAUR     5
  87  #define X86_VENDOR_TRANSMETA   7
  88  #define X86_VENDOR_NSC         8
  89 -#define X86_VENDOR_NUM         9
  90 +#define X86_VENDOR_RDC         9
  91 +#define X86_VENDOR_NUM         10
  92
  93  #define X86_VENDOR_UNKNOWN     0xff
  94
  95 --- a/arch/x86/kernel/cpu/Makefile
  96 +++ b/arch/x86/kernel/cpu/Makefile
  97 @@ -24,6 +24,7 @@ obj-$(CONFIG_CPU_SUP_CYRIX_32)                += cyrix
  98  obj-$(CONFIG_CPU_SUP_CENTAUR)          += centaur.o
  99  obj-$(CONFIG_CPU_SUP_TRANSMETA_32)     += transmeta.o
 100  obj-$(CONFIG_CPU_SUP_UMC_32)           += umc.o
 101 +obj-$(CONFIG_X86_RDC321X)              += rdc.o
 102
 103  obj-$(CONFIG_PERF_EVENTS)              += perf_event.o
 104
 105 --- /dev/null
 106 +++ b/arch/x86/kernel/cpu/rdc.c
 107 @@ -0,0 +1,69 @@
 108 +/*
 109 + * See Documentation/x86/rdc.txt
 110 + *
 111 + * mark@bifferos.com
 112 + */
 113 +
 114 +#include <linux/pci.h>
 115 +#include <asm/pci-direct.h>
 116 +#include "cpu.h"
 117 +
 118 +
 119 +static void __cpuinit rdc_identify(struct cpuinfo_x86 *c)
 120 +{
 121 +       u16 vendor, device;
 122 +       u32 customer_id;
 123 +
 124 +       if (!early_pci_allowed())
 125 +               return;
 126 +
 127 +       /* RDC CPU is SoC (system-on-chip), Northbridge is always present */
 128 +       vendor = read_pci_config_16(0, 0, 0, PCI_VENDOR_ID);
 129 +       device = read_pci_config_16(0, 0, 0, PCI_DEVICE_ID);
 130 +
 131 +       if (vendor != PCI_VENDOR_ID_RDC || device != PCI_DEVICE_ID_RDC_R6020)
 132 +               return;  /* not RDC */
 133 +       /*
 134 +        * NB: We could go on and check other devices, e.g. r6040 NIC, but
 135 +        * that's probably overkill
 136 +        */
 137 +
 138 +       customer_id = read_pci_config(0, 0, 0, 0x90);
 139 +
 140 +       switch (customer_id) {
 141 +               /* id names are from RDC */
 142 +       case 0x00321000:
 143 +               strcpy(c->x86_model_id, "R3210/R3211");
 144 +               break;
 145 +       case 0x00321001:
 146 +               strcpy(c->x86_model_id, "AMITRISC20000/20010");
 147 +               break;
 148 +       case 0x00321002:
 149 +               strcpy(c->x86_model_id, "R3210X/Edimax");
 150 +               break;
 151 +       case 0x00321003:
 152 +               strcpy(c->x86_model_id, "R3210/Kcodes");
 153 +               break;
 154 +       case 0x00321004:  /* tested */
 155 +               strcpy(c->x86_model_id, "S3282/CodeTek");
 156 +               break;
 157 +       case 0x00321007:
 158 +               strcpy(c->x86_model_id, "R8610");
 159 +               break;
 160 +       default:
 161 +               pr_info("RDC CPU: Unrecognised Customer ID (0x%x) please report to linux-kernel@vger.kernel.org\n", customer_id);
 162 +               break;
 163 +       }
 164 +
 165 +       strcpy(c->x86_vendor_id, "RDC");
 166 +       c->x86_vendor = X86_VENDOR_RDC;
 167 +}
 168 +
 169 +static const struct cpu_dev __cpuinitconst rdc_cpu_dev = {
 170 +       .c_vendor       = "RDC",
 171 +       .c_ident        = { "RDC" },
 172 +       .c_identify     = rdc_identify,
 173 +       .c_x86_vendor   = X86_VENDOR_RDC,
 174 +};
 175 +
 176 +cpu_dev_register(rdc_cpu_dev);