target/linux/adm5120/files/arch/mips/adm5120/adm5120_info.c

   1 /*
   2  *  $Id$
   3  *
   4  *  Copyright (C) 2007 OpenWrt.org
   5  *  Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify it
   8  *  under the terms of the GNU General Public License version 2 as published
   9  *  by the Free Software Foundation.
  10  *
  11  */
  12
  13 #include <linux/types.h>
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/io.h>
  17
  18 #include <asm/bootinfo.h>
  19 #include <asm/addrspace.h>
  20
  21 #include <adm5120_info.h>
  22 #include <adm5120_defs.h>
  23 #include <adm5120_switch.h>
  24
  25 unsigned int adm5120_product_code;
  26 unsigned int adm5120_revision;
  27 unsigned int adm5120_package;
  28 unsigned int adm5120_nand_boot;
  29 unsigned long adm5120_speed;
  30
  31 /*
  32  * CPU settings detection
  33  */
  34 #define CODE_GET_PC(c)          ((c) & CODE_PC_MASK)
  35 #define CODE_GET_REV(c)         (((c) >> CODE_REV_SHIFT) & CODE_REV_MASK)
  36 #define CODE_GET_PK(c)          (((c) >> CODE_PK_SHIFT) & CODE_PK_MASK)
  37 #define CODE_GET_CLKS(c)        (((c) >> CODE_CLKS_SHIFT) & CODE_CLKS_MASK)
  38 #define CODE_GET_NAB(c)         (((c) & CODE_NAB) != 0)
  39
  40 void adm5120_ndelay(u32 ns)
  41 {
  42         u32     t;
  43
  44         SW_WRITE_REG(SWITCH_REG_TIMER, TIMER_PERIOD_DEFAULT);
  45         SW_WRITE_REG(SWITCH_REG_TIMER_INT, (TIMER_INT_TOS | TIMER_INT_TOM));
  46
  47         t = (ns+640) / 640;
  48         t &= TIMER_PERIOD_MASK;
  49         SW_WRITE_REG(SWITCH_REG_TIMER, t | TIMER_TE);
  50
  51         /* wait until the timer expires */
  52         do {
  53                 t = SW_READ_REG(SWITCH_REG_TIMER_INT);
  54         } while ((t & TIMER_INT_TOS) == 0);
  55
  56         /* leave the timer disabled */
  57         SW_WRITE_REG(SWITCH_REG_TIMER, TIMER_PERIOD_DEFAULT);
  58         SW_WRITE_REG(SWITCH_REG_TIMER_INT, (TIMER_INT_TOS | TIMER_INT_TOM));
  59 }
  60
  61 void __init adm5120_soc_init(void)
  62 {
  63         u32 code;
  64         u32 clks;
  65
  66         code = SW_READ_REG(SWITCH_REG_CODE);
  67
  68         adm5120_product_code = CODE_GET_PC(code);
  69         adm5120_revision = CODE_GET_REV(code);
  70         adm5120_package = (CODE_GET_PK(code) == CODE_PK_BGA) ?
  71                 ADM5120_PACKAGE_BGA : ADM5120_PACKAGE_PQFP;
  72         adm5120_nand_boot = CODE_GET_NAB(code);
  73
  74         clks = CODE_GET_CLKS(code);
  75         adm5120_speed = ADM5120_SPEED_175;
  76         if (clks & 1)
  77                 adm5120_speed += 25000000;
  78         if (clks & 2)
  79                 adm5120_speed += 50000000;
  80 }