arch/arm/mach-rmobile/cpu_info-rcar.c

   1 /*
   2  * arch/arm/cpu/armv7/rmobile/cpu_info-rcar.c
   3  *
   4  * Copyright (C) 2013,2014 Renesas Electronics Corporation
   5  *
   6  * SPDX-License-Identifier: GPL-2.0
   7  */
   8 #include <common.h>
   9 #include <asm/io.h>
  10
  11 #define PRR_MASK                0x7fff
  12 #define R8A7796_REV_1_0         0x5200
  13 #define R8A7796_REV_1_1         0x5210
  14
  15 static u32 rmobile_get_prr(void);
  16
  17 u32 rmobile_get_cpu_type(void)
  18 {
  19         return (rmobile_get_prr() & 0x00007F00) >> 8;
  20 }
  21
  22 u32 rmobile_get_cpu_rev_integer(void)
  23 {
  24         const u32 prr = rmobile_get_prr();
  25
  26         if ((prr & PRR_MASK) == R8A7796_REV_1_1)
  27                 return 1;
  28         else
  29                 return ((prr & 0x000000F0) >> 4) + 1;
  30 }
  31
  32 u32 rmobile_get_cpu_rev_fraction(void)
  33 {
  34         const u32 prr = rmobile_get_prr();
  35
  36         if ((prr & PRR_MASK) == R8A7796_REV_1_1)
  37                 return 1;
  38         else
  39                 return prr & 0x0000000F;
  40 }
  41
  42 #if !CONFIG_IS_ENABLED(DM) || !CONFIG_IS_ENABLED(SYSCON)
  43 static u32 rmobile_get_prr(void)
  44 {
  45         /*
  46          * On RCar/RMobile Gen2 and older systems, the PRR is always
  47          * located at the address below. On newer systems, the PRR
  48          * may be located at different address, but that information
  49          * is obtained from DT. This code will be removed when all
  50          * of the older systems get converted to DM and OF control.
  51          */
  52         return readl(0xFF000044);
  53 }
  54 #else
  55
  56 #include <dm.h>
  57 #include <syscon.h>
  58 #include <regmap.h>
  59
  60 struct renesas_prr_priv {
  61         fdt_addr_t      regs;
  62 };
  63
  64 enum {
  65         PRR_RCAR,
  66 };
  67
  68 static u32 rmobile_get_prr(void)
  69 {
  70         struct regmap *map;
  71
  72         map = syscon_get_regmap_by_driver_data(PRR_RCAR);
  73         if (!map) {
  74                 printf("PRR regmap failed!\n");
  75                 hang();
  76         }
  77
  78         return readl(map->base);
  79 }
  80
  81 static const struct udevice_id renesas_prr_ids[] = {
  82         { .compatible = "renesas,prr", .data = PRR_RCAR },
  83         { }
  84 };
  85
  86 U_BOOT_DRIVER(renesas_prr) = {
  87         .name   = "renesas_prr",
  88         .id     = UCLASS_SYSCON,
  89         .of_match = renesas_prr_ids,
  90         .flags  = DM_FLAG_PRE_RELOC,
  91 };
  92 #endif