code.ossystems Code Review - meta-freescale.git/blob

   1 From 2feeb3198c6d9771f20c03bc1363db40241fd8f5 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Eric=20B=C3=A9nard?= <eric@eukrea.com>
   3 Date: Tue, 21 Feb 2012 01:05:43 +0100
   4 Subject: [PATCH 3/7] i.MX53: add silicn revision functions
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Signed-off-by: Eric Bénard <eric@eukrea.com>
  10 ---
  11 Upstream-Status: Applied for 2012.04.0
  12
  13  arch/arm/mach-imx/imx53.c                   |   45 +++++++++++++++++++++++++++
  14  arch/arm/mach-imx/include/mach/imx53-regs.h |    5 +++
  15  2 files changed, 50 insertions(+), 0 deletions(-)
  16
  17 diff --git a/arch/arm/mach-imx/imx53.c b/arch/arm/mach-imx/imx53.c
  18 index 2fb18e7..ad45be3 100644
  19 --- a/arch/arm/mach-imx/imx53.c
  20 +++ b/arch/arm/mach-imx/imx53.c
  21 @@ -37,6 +37,51 @@ void *imx_gpio_base[] = {
  22
  23  int imx_gpio_count = ARRAY_SIZE(imx_gpio_base) * 32;
  24
  25 +#define SI_REV 0x48
  26 +
  27 +static u32 mx53_silicon_revision;
  28 +static char *mx53_rev_string = "unknown";
  29 +
  30 +int imx_silicon_revision(void)
  31 +{
  32 +       return mx53_silicon_revision;
  33 +}
  34 +
  35 +static int query_silicon_revision(void)
  36 +{
  37 +       void __iomem *rom = MX53_IROM_BASE_ADDR;
  38 +       u32 rev;
  39 +
  40 +       rev = readl(rom + SI_REV);
  41 +       switch (rev) {
  42 +       case 0x10:
  43 +               mx53_silicon_revision = MX53_CHIP_REV_1_0;
  44 +               mx53_rev_string = "1.0";
  45 +               break;
  46 +       case 0x20:
  47 +               mx53_silicon_revision = MX53_CHIP_REV_2_0;
  48 +               mx53_rev_string = "2.0";
  49 +               break;
  50 +       case 0x21:
  51 +               mx53_silicon_revision = MX53_CHIP_REV_2_1;
  52 +               mx53_rev_string = "2.1";
  53 +               break;
  54 +       default:
  55 +               mx53_silicon_revision = 0;
  56 +       }
  57 +
  58 +       return 0;
  59 +}
  60 +core_initcall(query_silicon_revision);
  61 +
  62 +static int imx53_print_silicon_rev(void)
  63 +{
  64 +       printf("detected i.MX53 rev %s\n", mx53_rev_string);
  65 +
  66 +       return 0;
  67 +}
  68 +device_initcall(imx53_print_silicon_rev);
  69 +
  70  static int imx53_init(void)
  71  {
  72         add_generic_device("imx_iim", 0, NULL, MX53_IIM_BASE_ADDR, SZ_4K,
  73 diff --git a/arch/arm/mach-imx/include/mach/imx53-regs.h b/arch/arm/mach-imx/include/mach/imx53-regs.h
  74 index 8fefc54..065bf08 100644
  75 --- a/arch/arm/mach-imx/include/mach/imx53-regs.h
  76 +++ b/arch/arm/mach-imx/include/mach/imx53-regs.h
  77 @@ -135,5 +135,10 @@
  78  #define MX53_CS2_96MB_BASE_ADDR                0xF6000000
  79  #define MX53_CS3_BASE_ADDR             0xF6000000
  80
  81 +/* silicon revisions specific to i.MX53 */
  82 +#define MX53_CHIP_REV_1_0      0x10
  83 +#define MX53_CHIP_REV_2_0      0x20
  84 +#define MX53_CHIP_REV_2_1      0x21
  85 +
  86  #endif /* __MACH_IMX53_REGS_H */
  87
  88 --
  89 1.7.7.6
  90