target/linux/ramips/files/arch/mips/ralink/rt288x/rt288x.c

   1 /*
   2  * Ralink RT288x SoC specific setup
   3  *
   4  * Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
   5  * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   6  *
   7  * Parts of this file are based on Ralink's 2.6.21 BSP
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License version 2 as published
  11  * by the Free Software Foundation.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17
  18 #include <asm/mach-ralink/rt288x.h>
  19 #include <asm/mach-ralink/rt288x_regs.h>
  20
  21 unsigned char rt288x_sys_type[RT288X_SYS_TYPE_LEN];
  22
  23 unsigned long rt288x_cpu_freq;
  24 EXPORT_SYMBOL_GPL(rt288x_cpu_freq);
  25
  26 unsigned long rt288x_sys_freq;
  27 EXPORT_SYMBOL_GPL(rt288x_sys_freq);
  28
  29 void __iomem * rt288x_sysc_base;
  30 void __iomem * rt288x_memc_base;
  31
  32 void __init rt288x_detect_sys_type(void)
  33 {
  34         u32 n0;
  35         u32 n1;
  36         u32 id;
  37
  38         n0 = rt288x_sysc_rr(SYSC_REG_CHIP_NAME0);
  39         n1 = rt288x_sysc_rr(SYSC_REG_CHIP_NAME1);
  40         id = rt288x_sysc_rr(SYSC_REG_CHIP_ID);
  41
  42         snprintf(rt288x_sys_type, RT288X_SYS_TYPE_LEN,
  43                 "Ralink %c%c%c%c%c%c%c%c id:%u rev:%u",
  44                 (char) (n0 & 0xff), (char) ((n0 >> 8) & 0xff),
  45                 (char) ((n0 >> 16) & 0xff), (char) ((n0 >> 24) & 0xff),
  46                 (char) (n1 & 0xff), (char) ((n1 >> 8) & 0xff),
  47                 (char) ((n1 >> 16) & 0xff), (char) ((n1 >> 24) & 0xff),
  48                 (id >> CHIP_ID_ID_SHIFT) & CHIP_ID_ID_MASK,
  49                 (id & CHIP_ID_REV_MASK));
  50 }
  51
  52 void __init rt288x_detect_sys_freq(void)
  53 {
  54         u32     t;
  55
  56         t = rt288x_sysc_rr(SYSC_REG_SYSTEM_CONFIG);
  57         t = ((t >> SYSTEM_CONFIG_CPUCLK_SHIFT) & SYSTEM_CONFIG_CPUCLK_MASK);
  58
  59         switch (t) {
  60         case SYSTEM_CONFIG_CPUCLK_250:
  61                 rt288x_cpu_freq = 250000000;
  62                 break;
  63         case SYSTEM_CONFIG_CPUCLK_266:
  64                 rt288x_cpu_freq = 266666667;
  65                 break;
  66         case SYSTEM_CONFIG_CPUCLK_280:
  67                 rt288x_cpu_freq = 280000000;
  68                 break;
  69         case SYSTEM_CONFIG_CPUCLK_300:
  70                 rt288x_cpu_freq = 300000000;
  71                 break;
  72         }
  73
  74         rt288x_sys_freq = rt288x_cpu_freq / 2;
  75 }
  76