target/linux/brcm63xx/patches-3.3/024-MIPS-BCM63XX-Use-the-Chip-ID-register-for-identifyin.patch

   1 From a9168d99658bd050e49afc06880d140e2fc2c231 Mon Sep 17 00:00:00 2001
   2 From: Jonas Gorski <jonas.gorski@gmail.com>
   3 Date: Tue, 12 Jun 2012 10:23:40 +0200
   4 Subject: [PATCH 3/8] MIPS: BCM63XX: Use the Chip ID register for identifying the SoC
   5
   6 Newer BCM63XX SoCs use virtually the same CPU ID, differing only in the
   7 revision bits. But since they all have the Chip ID register at the same
   8 location, we can use that to identify the SoC we are running on.
   9
  10 Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
  11 Cc: linux-mips@linux-mips.org
  12 Cc: Maxime Bizon <mbizon@freebox.fr>
  13 Cc: Florian Fainelli <florian@openwrt.org>
  14 Cc: Kevin Cernekee <cernekee@gmail.com>
  15 Patchwork: https://patchwork.linux-mips.org/patch/3955/
  16 Reviewed-by: Florian Fainelli <florian@openwrt.org>
  17 Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
  18 ---
  19  arch/mips/bcm63xx/cpu.c |   20 ++++++++++++--------
  20  1 files changed, 12 insertions(+), 8 deletions(-)
  21
  22 --- a/arch/mips/bcm63xx/cpu.c
  23 +++ b/arch/mips/bcm63xx/cpu.c
  24 @@ -228,17 +228,21 @@ void __init bcm63xx_cpu_init(void)
  25                 bcm63xx_irqs = bcm6345_irqs;
  26                 break;
  27         case CPU_BMIPS4350:
  28 -               switch (read_c0_prid() & 0xf0) {
  29 -               case 0x10:
  30 +               if ((read_c0_prid() & 0xf0) == 0x10) {
  31                         expected_cpu_id = BCM6358_CPU_ID;
  32                         bcm63xx_regs_base = bcm6358_regs_base;
  33                         bcm63xx_irqs = bcm6358_irqs;
  34 -                       break;
  35 -               case 0x30:
  36 -                       expected_cpu_id = BCM6368_CPU_ID;
  37 -                       bcm63xx_regs_base = bcm6368_regs_base;
  38 -                       bcm63xx_irqs = bcm6368_irqs;
  39 -                       break;
  40 +               } else {
  41 +                       /* all newer chips have the same chip id location */
  42 +                       u16 chip_id = bcm_readw(BCM_6368_PERF_BASE);
  43 +
  44 +                       switch (chip_id) {
  45 +                       case BCM6368_CPU_ID:
  46 +                               expected_cpu_id = BCM6368_CPU_ID;
  47 +                               bcm63xx_regs_base = bcm6368_regs_base;
  48 +                               bcm63xx_irqs = bcm6368_irqs;
  49 +                               break;
  50 +                       }
  51                 }
  52                 break;
  53         }