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gerrit.nordix.org / codeaurora / cp-linux / 8d8f6542b666daf5e87de156590e635c2c4da0c0 / . / arch / mips / loongson64 / lemote-2f / ec_kb3310b.c
blob: 2b666d3a3947d5baa81731ab4349a04c54b25023 [file] [log] [blame]
Kyle Swenson8d8f6542021-03-15 11:02:55 -0600[diff] [blame^]1/*
2 * Basic KB3310B Embedded Controller support for the YeeLoong 2F netbook
3 *
4 * Copyright (C) 2008 Lemote Inc.
5 * Author: liujl <liujl@lemote.com>, 2008-04-20
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 */
12
13#include <linux/module.h>
14#include <linux/spinlock.h>
15#include <linux/delay.h>
16
17#include "ec_kb3310b.h"
18
19static DEFINE_SPINLOCK(index_access_lock);
20static DEFINE_SPINLOCK(port_access_lock);
21
22unsigned char ec_read(unsigned short addr)
23{
24 unsigned char value;
25 unsigned long flags;
26
27 spin_lock_irqsave(&index_access_lock, flags);
28 outb((addr & 0xff00) >> 8, EC_IO_PORT_HIGH);
29 outb((addr & 0x00ff), EC_IO_PORT_LOW);
30 value = inb(EC_IO_PORT_DATA);
31 spin_unlock_irqrestore(&index_access_lock, flags);
32
33 return value;
34}
35EXPORT_SYMBOL_GPL(ec_read);
36
37void ec_write(unsigned short addr, unsigned char val)
38{
39 unsigned long flags;
40
41 spin_lock_irqsave(&index_access_lock, flags);
42 outb((addr & 0xff00) >> 8, EC_IO_PORT_HIGH);
43 outb((addr & 0x00ff), EC_IO_PORT_LOW);
44 outb(val, EC_IO_PORT_DATA);
45 /* flush the write action */
46 inb(EC_IO_PORT_DATA);
47 spin_unlock_irqrestore(&index_access_lock, flags);
48}
49EXPORT_SYMBOL_GPL(ec_write);
50
51/*
52 * This function is used for EC command writes and corresponding status queries.
53 */
54int ec_query_seq(unsigned char cmd)
55{
56 int timeout;
57 unsigned char status;
58 unsigned long flags;
59 int ret = 0;
60
61 spin_lock_irqsave(&port_access_lock, flags);
62
63 /* make chip goto reset mode */
64 udelay(EC_REG_DELAY);
65 outb(cmd, EC_CMD_PORT);
66 udelay(EC_REG_DELAY);
67
68 /* check if the command is received by ec */
69 timeout = EC_CMD_TIMEOUT;
70 status = inb(EC_STS_PORT);
71 while (timeout-- && (status & (1 << 1))) {
72 status = inb(EC_STS_PORT);
73 udelay(EC_REG_DELAY);
74 }
75
76 spin_unlock_irqrestore(&port_access_lock, flags);
77
78 if (timeout <= 0) {
79 printk(KERN_ERR "%s: deadable error : timeout...\n", __func__);
80 ret = -EINVAL;
81 } else
82 printk(KERN_INFO
83 "(%x/%d)ec issued command %d status : 0x%x\n",
84 timeout, EC_CMD_TIMEOUT - timeout, cmd, status);
85
86 return ret;
87}
88EXPORT_SYMBOL_GPL(ec_query_seq);
89
90/*
91 * Send query command to EC to get the proper event number
92 */
93int ec_query_event_num(void)
94{
95 return ec_query_seq(CMD_GET_EVENT_NUM);
96}
97EXPORT_SYMBOL(ec_query_event_num);
98
99/*
100 * Get event number from EC
101 *
102 * NOTE: This routine must follow the query_event_num function in the
103 * interrupt.
104 */
105int ec_get_event_num(void)
106{
107 int timeout = 100;
108 unsigned char value;
109 unsigned char status;
110
111 udelay(EC_REG_DELAY);
112 status = inb(EC_STS_PORT);
113 udelay(EC_REG_DELAY);
114 while (timeout-- && !(status & (1 << 0))) {
115 status = inb(EC_STS_PORT);
116 udelay(EC_REG_DELAY);
117 }
118 if (timeout <= 0) {
119 pr_info("%s: get event number timeout.\n", __func__);
120
121 return -EINVAL;
122 }
123 value = inb(EC_DAT_PORT);
124 udelay(EC_REG_DELAY);
125
126 return value;
127}
128EXPORT_SYMBOL(ec_get_event_num);