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/io.h>
14 #include <linux/export.h>
15 #include <linux/spinlock.h>
16 #include <linux/delay.h>
17
18 #include "ec_kb3310b.h"
19
20 static DEFINE_SPINLOCK(index_access_lock);
21 static DEFINE_SPINLOCK(port_access_lock);
22
ec_read(unsigned short addr)23 unsigned char ec_read(unsigned short addr)
24 {
25 unsigned char value;
26 unsigned long flags;
27
28 spin_lock_irqsave(&index_access_lock, flags);
29 outb((addr & 0xff00) >> 8, EC_IO_PORT_HIGH);
30 outb((addr & 0x00ff), EC_IO_PORT_LOW);
31 value = inb(EC_IO_PORT_DATA);
32 spin_unlock_irqrestore(&index_access_lock, flags);
33
34 return value;
35 }
36 EXPORT_SYMBOL_GPL(ec_read);
37
ec_write(unsigned short addr,unsigned char val)38 void ec_write(unsigned short addr, unsigned char val)
39 {
40 unsigned long flags;
41
42 spin_lock_irqsave(&index_access_lock, flags);
43 outb((addr & 0xff00) >> 8, EC_IO_PORT_HIGH);
44 outb((addr & 0x00ff), EC_IO_PORT_LOW);
45 outb(val, EC_IO_PORT_DATA);
46 /* flush the write action */
47 inb(EC_IO_PORT_DATA);
48 spin_unlock_irqrestore(&index_access_lock, flags);
49 }
50 EXPORT_SYMBOL_GPL(ec_write);
51
52 /*
53 * This function is used for EC command writes and corresponding status queries.
54 */
ec_query_seq(unsigned char cmd)55 int ec_query_seq(unsigned char cmd)
56 {
57 int timeout;
58 unsigned char status;
59 unsigned long flags;
60 int ret = 0;
61
62 spin_lock_irqsave(&port_access_lock, flags);
63
64 /* make chip goto reset mode */
65 udelay(EC_REG_DELAY);
66 outb(cmd, EC_CMD_PORT);
67 udelay(EC_REG_DELAY);
68
69 /* check if the command is received by ec */
70 timeout = EC_CMD_TIMEOUT;
71 status = inb(EC_STS_PORT);
72 while (timeout-- && (status & (1 << 1))) {
73 status = inb(EC_STS_PORT);
74 udelay(EC_REG_DELAY);
75 }
76
77 spin_unlock_irqrestore(&port_access_lock, flags);
78
79 if (timeout <= 0) {
80 printk(KERN_ERR "%s: deadable error : timeout...\n", __func__);
81 ret = -EINVAL;
82 } else
83 printk(KERN_INFO
84 "(%x/%d)ec issued command %d status : 0x%x\n",
85 timeout, EC_CMD_TIMEOUT - timeout, cmd, status);
86
87 return ret;
88 }
89 EXPORT_SYMBOL_GPL(ec_query_seq);
90
91 /*
92 * Send query command to EC to get the proper event number
93 */
ec_query_event_num(void)94 int ec_query_event_num(void)
95 {
96 return ec_query_seq(CMD_GET_EVENT_NUM);
97 }
98 EXPORT_SYMBOL(ec_query_event_num);
99
100 /*
101 * Get event number from EC
102 *
103 * NOTE: This routine must follow the query_event_num function in the
104 * interrupt.
105 */
ec_get_event_num(void)106 int ec_get_event_num(void)
107 {
108 int timeout = 100;
109 unsigned char value;
110 unsigned char status;
111
112 udelay(EC_REG_DELAY);
113 status = inb(EC_STS_PORT);
114 udelay(EC_REG_DELAY);
115 while (timeout-- && !(status & (1 << 0))) {
116 status = inb(EC_STS_PORT);
117 udelay(EC_REG_DELAY);
118 }
119 if (timeout <= 0) {
120 pr_info("%s: get event number timeout.\n", __func__);
121
122 return -EINVAL;
123 }
124 value = inb(EC_DAT_PORT);
125 udelay(EC_REG_DELAY);
126
127 return value;
128 }
129 EXPORT_SYMBOL(ec_get_event_num);
130
