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
19 static DEFINE_SPINLOCK(index_access_lock);
20 static DEFINE_SPINLOCK(port_access_lock);
21
ec_read(unsigned short addr)22 unsigned 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 }
35 EXPORT_SYMBOL_GPL(ec_read);
36
ec_write(unsigned short addr,unsigned char val)37 void 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 }
49 EXPORT_SYMBOL_GPL(ec_write);
50
51 /*
52 * This function is used for EC command writes and corresponding status queries.
53 */
ec_query_seq(unsigned char cmd)54 int 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 }
88 EXPORT_SYMBOL_GPL(ec_query_seq);
89
90 /*
91 * Send query command to EC to get the proper event number
92 */
ec_query_event_num(void)93 int ec_query_event_num(void)
94 {
95 return ec_query_seq(CMD_GET_EVENT_NUM);
96 }
97 EXPORT_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 */
ec_get_event_num(void)105 int 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 }
128 EXPORT_SYMBOL(ec_get_event_num);
129