arch/mips/loongson2ef/lemote-2f/reset.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* Board-specific reboot/shutdown routines
   3  *
   4  * Copyright (c) 2009 Philippe Vachon <philippe@cowpig.ca>
   5  *
   6  * Copyright (C) 2009 Lemote Inc.
   7  * Author: Wu Zhangjin, wuzhangjin@gmail.com
   8  */
   9
  10 #include <linux/io.h>
  11 #include <linux/delay.h>
  12 #include <linux/types.h>
  13
  14 #include <asm/bootinfo.h>
  15
  16 #include <loongson.h>
  17
  18 #include <cs5536/cs5536.h>
  19 #include "ec_kb3310b.h"
  20
  21 static void reset_cpu(void)
  22 {
  23         /*
  24          * reset cpu to full speed, this is needed when enabling cpu frequency
  25          * scalling
  26          */
  27         writel(readl(LOONGSON_CHIPCFG) | 0x7, LOONGSON_CHIPCFG);
  28 }
  29
  30 /* reset support for fuloong2f */
  31
  32 static void fl2f_reboot(void)
  33 {
  34         reset_cpu();
  35
  36         /* send a reset signal to south bridge.
  37          *
  38          * NOTE: if enable "Power Management" in kernel, rtl8169 will not reset
  39          * normally with this reset operation and it will not work in PMON, but
  40          * you can type halt command and then reboot, seems the hardware reset
  41          * logic not work normally.
  42          */
  43         {
  44                 u32 hi, lo;
  45                 _rdmsr(DIVIL_MSR_REG(DIVIL_SOFT_RESET), &hi, &lo);
  46                 lo |= 0x00000001;
  47                 _wrmsr(DIVIL_MSR_REG(DIVIL_SOFT_RESET), hi, lo);
  48         }
  49 }
  50
  51 static void fl2f_shutdown(void)
  52 {
  53         u32 hi, lo, val;
  54         int gpio_base;
  55
  56         /* get gpio base */
  57         _rdmsr(DIVIL_MSR_REG(DIVIL_LBAR_GPIO), &hi, &lo);
  58         gpio_base = lo & 0xff00;
  59
  60         /* make cs5536 gpio13 output enable */
  61         val = inl(gpio_base + GPIOL_OUT_EN);
  62         val &= ~(1 << (16 + 13));
  63         val |= (1 << 13);
  64         outl(val, gpio_base + GPIOL_OUT_EN);
  65         mmiowb();
  66         /* make cs5536 gpio13 output low level voltage. */
  67         val = inl(gpio_base + GPIOL_OUT_VAL) & ~(1 << (13));
  68         val |= (1 << (16 + 13));
  69         outl(val, gpio_base + GPIOL_OUT_VAL);
  70         mmiowb();
  71 }
  72
  73 /* reset support for yeeloong2f and mengloong2f notebook */
  74
  75 static void ml2f_reboot(void)
  76 {
  77         reset_cpu();
  78
  79         /* sending an reset signal to EC(embedded controller) */
  80         ec_write(REG_RESET, BIT_RESET_ON);
  81 }
  82
  83 #define yl2f89_reboot ml2f_reboot
  84
  85 /* menglong(7inches) laptop has different shutdown logic from 8.9inches */
  86 #define EC_SHUTDOWN_IO_PORT_HIGH 0xff2d
  87 #define EC_SHUTDOWN_IO_PORT_LOW  0xff2e
  88 #define EC_SHUTDOWN_IO_PORT_DATA 0xff2f
  89 #define REG_SHUTDOWN_HIGH        0xFC
  90 #define REG_SHUTDOWN_LOW         0x29
  91 #define BIT_SHUTDOWN_ON          (1 << 1)
  92
  93 static void ml2f_shutdown(void)
  94 {
  95         u8 val;
  96         u64 i;
  97
  98         outb(REG_SHUTDOWN_HIGH, EC_SHUTDOWN_IO_PORT_HIGH);
  99         outb(REG_SHUTDOWN_LOW, EC_SHUTDOWN_IO_PORT_LOW);
 100         mmiowb();
 101         val = inb(EC_SHUTDOWN_IO_PORT_DATA);
 102         outb(val & (~BIT_SHUTDOWN_ON), EC_SHUTDOWN_IO_PORT_DATA);
 103         mmiowb();
 104         /* need enough wait here... how many microseconds needs? */
 105         for (i = 0; i < 0x10000; i++)
 106                 delay();
 107         outb(val | BIT_SHUTDOWN_ON, EC_SHUTDOWN_IO_PORT_DATA);
 108         mmiowb();
 109 }
 110
 111 static void yl2f89_shutdown(void)
 112 {
 113         /* cpu-gpio0 output low */
 114         LOONGSON_GPIODATA &= ~0x00000001;
 115         /* cpu-gpio0 as output */
 116         LOONGSON_GPIOIE &= ~0x00000001;
 117 }
 118
 119 void mach_prepare_reboot(void)
 120 {
 121         switch (mips_machtype) {
 122         case MACH_LEMOTE_FL2F:
 123         case MACH_LEMOTE_NAS:
 124         case MACH_LEMOTE_LL2F:
 125                 fl2f_reboot();
 126                 break;
 127         case MACH_LEMOTE_ML2F7:
 128                 ml2f_reboot();
 129                 break;
 130         case MACH_LEMOTE_YL2F89:
 131                 yl2f89_reboot();
 132                 break;
 133         default:
 134                 break;
 135         }
 136 }
 137
 138 void mach_prepare_shutdown(void)
 139 {
 140         switch (mips_machtype) {
 141         case MACH_LEMOTE_FL2F:
 142         case MACH_LEMOTE_NAS:
 143         case MACH_LEMOTE_LL2F:
 144                 fl2f_shutdown();
 145                 break;
 146         case MACH_LEMOTE_ML2F7:
 147                 ml2f_shutdown();
 148                 break;
 149         case MACH_LEMOTE_YL2F89:
 150                 yl2f89_shutdown();
 151                 break;
 152         default:
 153                 break;
 154         }
 155 }