LXR linux/arch/mips/loongson/lemote-2f/reset.c

   1/* Board-specific reboot/shutdown routines
   2 *
   3 * Copyright (c) 2009 Philippe Vachon <philippe@cowpig.ca>
   4 *
   5 * Copyright (C) 2009 Lemote Inc.
   6 * Author: Wu Zhangjin, wuzhangjin@gmail.com
   7 *
   8 * This program is free software; you can redistribute  it and/or modify it
   9 * under  the terms of  the GNU General  Public License as published by the
  10 * Free Software Foundation;  either version 2 of the  License, or (at your
  11 * option) any later version.
  12 */
  13
  14#include <linux/io.h>
  15#include <linux/delay.h>
  16#include <linux/types.h>
  17
  18#include <asm/bootinfo.h>
  19
  20#include <loongson.h>
  21
  22#include <cs5536/cs5536.h>
  23#include "ec_kb3310b.h"
  24
  25static void reset_cpu(void)
  26{
  27        /*
  28         * reset cpu to full speed, this is needed when enabling cpu frequency
  29         * scalling
  30         */
  31        LOONGSON_CHIPCFG0 |= 0x7;
  32}
  33
  34/* reset support for fuloong2f */
  35
  36static void fl2f_reboot(void)
  37{
  38        reset_cpu();
  39
  40        /* send a reset signal to south bridge.
  41         *
  42         * NOTE: if enable "Power Management" in kernel, rtl8169 will not reset
  43         * normally with this reset operation and it will not work in PMON, but
  44         * you can type halt command and then reboot, seems the hardware reset
  45         * logic not work normally.
  46         */
  47        {
  48                u32 hi, lo;
  49                _rdmsr(DIVIL_MSR_REG(DIVIL_SOFT_RESET), &hi, &lo);
  50                lo |= 0x00000001;
  51                _wrmsr(DIVIL_MSR_REG(DIVIL_SOFT_RESET), hi, lo);
  52        }
  53}
  54
  55static void fl2f_shutdown(void)
  56{
  57        u32 hi, lo, val;
  58        int gpio_base;
  59
  60        /* get gpio base */
  61        _rdmsr(DIVIL_MSR_REG(DIVIL_LBAR_GPIO), &hi, &lo);
  62        gpio_base = lo & 0xff00;
  63
  64        /* make cs5536 gpio13 output enable */
  65        val = inl(gpio_base + GPIOL_OUT_EN);
  66        val &= ~(1 << (16 + 13));
  67        val |= (1 << 13);
  68        outl(val, gpio_base + GPIOL_OUT_EN);
  69        mmiowb();
  70        /* make cs5536 gpio13 output low level voltage. */
  71        val = inl(gpio_base + GPIOL_OUT_VAL) & ~(1 << (13));
  72        val |= (1 << (16 + 13));
  73        outl(val, gpio_base + GPIOL_OUT_VAL);
  74        mmiowb();
  75}
  76
  77/* reset support for yeeloong2f and mengloong2f notebook */
  78
  79void ml2f_reboot(void)
  80{
  81        reset_cpu();
  82
  83        /* sending an reset signal to EC(embedded controller) */
  84        ec_write(REG_RESET, BIT_RESET_ON);
  85}
  86
  87#define yl2f89_reboot ml2f_reboot
  88
  89/* menglong(7inches) laptop has different shutdown logic from 8.9inches */
  90#define EC_SHUTDOWN_IO_PORT_HIGH 0xff2d
  91#define EC_SHUTDOWN_IO_PORT_LOW  0xff2e
  92#define EC_SHUTDOWN_IO_PORT_DATA 0xff2f
  93#define REG_SHUTDOWN_HIGH        0xFC
  94#define REG_SHUTDOWN_LOW         0x29
  95#define BIT_SHUTDOWN_ON          (1 << 1)
  96
  97static void ml2f_shutdown(void)
  98{
  99        u8 val;
 100        u64 i;
 101
 102        outb(REG_SHUTDOWN_HIGH, EC_SHUTDOWN_IO_PORT_HIGH);
 103        outb(REG_SHUTDOWN_LOW, EC_SHUTDOWN_IO_PORT_LOW);
 104        mmiowb();
 105        val = inb(EC_SHUTDOWN_IO_PORT_DATA);
 106        outb(val & (~BIT_SHUTDOWN_ON), EC_SHUTDOWN_IO_PORT_DATA);
 107        mmiowb();
 108        /* need enough wait here... how many microseconds needs? */
 109        for (i = 0; i < 0x10000; i++)
 110                delay();
 111        outb(val | BIT_SHUTDOWN_ON, EC_SHUTDOWN_IO_PORT_DATA);
 112        mmiowb();
 113}
 114
 115static void yl2f89_shutdown(void)
 116{
 117        /* cpu-gpio0 output low */
 118        LOONGSON_GPIODATA &= ~0x00000001;
 119        /* cpu-gpio0 as output */
 120        LOONGSON_GPIOIE &= ~0x00000001;
 121}
 122
 123void mach_prepare_reboot(void)
 124{
 125        switch (mips_machtype) {
 126        case MACH_LEMOTE_FL2F:
 127        case MACH_LEMOTE_NAS:
 128        case MACH_LEMOTE_LL2F:
 129                fl2f_reboot();
 130                break;
 131        case MACH_LEMOTE_ML2F7:
 132                ml2f_reboot();
 133                break;
 134        case MACH_LEMOTE_YL2F89:
 135                yl2f89_reboot();
 136                break;
 137        default:
 138                break;
 139        }
 140}
 141
 142void mach_prepare_shutdown(void)
 143{
 144        switch (mips_machtype) {
 145        case MACH_LEMOTE_FL2F:
 146        case MACH_LEMOTE_NAS:
 147        case MACH_LEMOTE_LL2F:
 148                fl2f_shutdown();
 149                break;
 150        case MACH_LEMOTE_ML2F7:
 151                ml2f_shutdown();
 152                break;
 153        case MACH_LEMOTE_YL2F89:
 154                yl2f89_shutdown();
 155                break;
 156        default:
 157                break;
 158        }
 159}
 160