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reset.c
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1 /* Board-specific reboot/shutdown routines
2  *
3  * Copyright (c) 2009 Philippe Vachon <[email protected]>
4  *
5  * Copyright (C) 2009 Lemote Inc.
6  * Author: Wu Zhangjin, [email protected]
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 }
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