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
  25 static 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
  36 static 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
  55 static 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
  79 void 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
  97 static 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
 115 static 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
 123 void 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
 142 void 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 }