arch/microblaze/kernel/cpu/cpuinfo.c

   1 /*
   2  * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
   3  * Copyright (C) 2007-2009 PetaLogix
   4  * Copyright (C) 2007 John Williams <john.williams@petalogix.com>
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License. See the file "COPYING" in the main directory of this archive
   8  * for more details.
   9  */
  10
  11 #include <linux/clk.h>
  12 #include <linux/init.h>
  13 #include <asm/cpuinfo.h>
  14 #include <asm/pvr.h>
  15
  16 const struct cpu_ver_key cpu_ver_lookup[] = {
  17         /* These key value are as per MBV field in PVR0 */
  18         {"5.00.a", 0x01},
  19         {"5.00.b", 0x02},
  20         {"5.00.c", 0x03},
  21         {"6.00.a", 0x04},
  22         {"6.00.b", 0x06},
  23         {"7.00.a", 0x05},
  24         {"7.00.b", 0x07},
  25         {"7.10.a", 0x08},
  26         {"7.10.b", 0x09},
  27         {"7.10.c", 0x0a},
  28         {"7.10.d", 0x0b},
  29         {"7.20.a", 0x0c},
  30         {"7.20.b", 0x0d},
  31         {"7.20.c", 0x0e},
  32         {"7.20.d", 0x0f},
  33         {"7.30.a", 0x10},
  34         {"7.30.b", 0x11},
  35         {"8.00.a", 0x12},
  36         {"8.00.b", 0x13},
  37         {"8.10.a", 0x14},
  38         {"8.20.a", 0x15},
  39         {"8.20.b", 0x16},
  40         {"8.30.a", 0x17},
  41         {"8.40.a", 0x18},
  42         {"8.40.b", 0x19},
  43         {"9.0", 0x1b},
  44         {"9.1", 0x1d},
  45         {NULL, 0},
  46 };
  47
  48 /*
  49  * FIXME Not sure if the actual key is defined by Xilinx in the PVR
  50  */
  51 const struct family_string_key family_string_lookup[] = {
  52         {"virtex2", 0x4},
  53         {"virtex2pro", 0x5},
  54         {"spartan3", 0x6},
  55         {"virtex4", 0x7},
  56         {"virtex5", 0x8},
  57         {"spartan3e", 0x9},
  58         {"spartan3a", 0xa},
  59         {"spartan3an", 0xb},
  60         {"spartan3adsp", 0xc},
  61         {"spartan6", 0xd},
  62         {"virtex6", 0xe},
  63         /* FIXME There is no key code defined for spartan2 */
  64         {"spartan2", 0xf0},
  65         {"kintex7", 0x10},
  66         {"artix7", 0x11},
  67         {"zynq7000", 0x12},
  68         {NULL, 0},
  69 };
  70
  71 struct cpuinfo cpuinfo;
  72 static struct device_node *cpu;
  73
  74 void __init setup_cpuinfo(void)
  75 {
  76         cpu = (struct device_node *) of_find_node_by_type(NULL, "cpu");
  77         if (!cpu)
  78                 pr_err("You don't have cpu!!!\n");
  79
  80         pr_info("%s: initialising\n", __func__);
  81
  82         switch (cpu_has_pvr()) {
  83         case 0:
  84                 pr_warn("%s: No PVR support. Using static CPU info from FDT\n",
  85                         __func__);
  86                 set_cpuinfo_static(&cpuinfo, cpu);
  87                 break;
  88 /* FIXME I found weird behavior with MB 7.00.a/b 7.10.a
  89  * please do not use FULL PVR with MMU */
  90         case 1:
  91                 pr_info("%s: Using full CPU PVR support\n",
  92                         __func__);
  93                 set_cpuinfo_static(&cpuinfo, cpu);
  94                 set_cpuinfo_pvr_full(&cpuinfo, cpu);
  95                 break;
  96         default:
  97                 pr_warn("%s: Unsupported PVR setting\n", __func__);
  98                 set_cpuinfo_static(&cpuinfo, cpu);
  99         }
 100
 101         if (cpuinfo.mmu_privins)
 102                 pr_warn("%s: Stream instructions enabled"
 103                         " - USERSPACE CAN LOCK THIS KERNEL!\n", __func__);
 104 }
 105
 106 void __init setup_cpuinfo_clk(void)
 107 {
 108         struct clk *clk;
 109
 110         clk = of_clk_get(cpu, 0);
 111         if (IS_ERR(clk)) {
 112                 pr_err("ERROR: CPU CCF input clock not found\n");
 113                 /* take timebase-frequency from DTS */
 114                 cpuinfo.cpu_clock_freq = fcpu(cpu, "timebase-frequency");
 115         } else {
 116                 cpuinfo.cpu_clock_freq = clk_get_rate(clk);
 117         }
 118
 119         if (!cpuinfo.cpu_clock_freq) {
 120                 pr_err("ERROR: CPU clock frequency not setup\n");
 121                 BUG();
 122         }
 123 }