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1da177e4 | 1 | /* |
1da177e4 LT |
2 | i2c Support for Via Technologies 82C586B South Bridge |
3 | ||
96de0e25 | 4 | Copyright (c) 1998, 1999 Kyösti Mälkki <kmalkki@cc.hut.fi> |
1da177e4 LT |
5 | |
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
1da177e4 LT |
15 | */ |
16 | ||
1da177e4 LT |
17 | #include <linux/kernel.h> |
18 | #include <linux/module.h> | |
19 | #include <linux/pci.h> | |
20 | #include <linux/ioport.h> | |
1da177e4 LT |
21 | #include <linux/i2c.h> |
22 | #include <linux/i2c-algo-bit.h> | |
21782180 | 23 | #include <linux/io.h> |
1da177e4 LT |
24 | |
25 | /* Power management registers */ | |
26 | #define PM_CFG_REVID 0x08 /* silicon revision code */ | |
27 | #define PM_CFG_IOBASE0 0x20 | |
28 | #define PM_CFG_IOBASE1 0x48 | |
29 | ||
30 | #define I2C_DIR (pm_io_base+0x40) | |
31 | #define I2C_OUT (pm_io_base+0x42) | |
32 | #define I2C_IN (pm_io_base+0x44) | |
33 | #define I2C_SCL 0x02 /* clock bit in DIR/OUT/IN register */ | |
34 | #define I2C_SDA 0x04 | |
35 | ||
36 | /* io-region reservation */ | |
37 | #define IOSPACE 0x06 | |
1da177e4 | 38 | |
d6072f84 | 39 | static struct pci_driver vt586b_driver; |
60507095 | 40 | static u16 pm_io_base; |
1da177e4 LT |
41 | |
42 | /* | |
43 | It does not appear from the datasheet that the GPIO pins are | |
44 | open drain. So a we set a low value by setting the direction to | |
45 | output and a high value by setting the direction to input and | |
46 | relying on the required I2C pullup. The data value is initialized | |
47 | to 0 in via_init() and never changed. | |
48 | */ | |
49 | static void bit_via_setscl(void *data, int state) | |
50 | { | |
51 | outb(state ? inb(I2C_DIR) & ~I2C_SCL : inb(I2C_DIR) | I2C_SCL, I2C_DIR); | |
52 | } | |
53 | ||
54 | static void bit_via_setsda(void *data, int state) | |
55 | { | |
56 | outb(state ? inb(I2C_DIR) & ~I2C_SDA : inb(I2C_DIR) | I2C_SDA, I2C_DIR); | |
57 | } | |
58 | ||
59 | static int bit_via_getscl(void *data) | |
60 | { | |
61 | return (0 != (inb(I2C_IN) & I2C_SCL)); | |
62 | } | |
63 | ||
64 | static int bit_via_getsda(void *data) | |
65 | { | |
66 | return (0 != (inb(I2C_IN) & I2C_SDA)); | |
67 | } | |
68 | ||
69 | ||
70 | static struct i2c_algo_bit_data bit_data = { | |
71 | .setsda = bit_via_setsda, | |
72 | .setscl = bit_via_setscl, | |
73 | .getsda = bit_via_getsda, | |
74 | .getscl = bit_via_getscl, | |
75 | .udelay = 5, | |
1da177e4 LT |
76 | .timeout = HZ |
77 | }; | |
78 | ||
79 | static struct i2c_adapter vt586b_adapter = { | |
80 | .owner = THIS_MODULE, | |
3401b2ff | 81 | .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, |
1da177e4 LT |
82 | .name = "VIA i2c", |
83 | .algo_data = &bit_data, | |
84 | }; | |
85 | ||
86 | ||
392debf1 | 87 | static const struct pci_device_id vt586b_ids[] = { |
1da177e4 LT |
88 | { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_3) }, |
89 | { 0, } | |
90 | }; | |
91 | ||
92 | MODULE_DEVICE_TABLE (pci, vt586b_ids); | |
93 | ||
0b255e92 | 94 | static int vt586b_probe(struct pci_dev *dev, const struct pci_device_id *id) |
1da177e4 LT |
95 | { |
96 | u16 base; | |
97 | u8 rev; | |
98 | int res; | |
99 | ||
100 | if (pm_io_base) { | |
101 | dev_err(&dev->dev, "i2c-via: Will only support one host\n"); | |
102 | return -ENODEV; | |
103 | } | |
104 | ||
105 | pci_read_config_byte(dev, PM_CFG_REVID, &rev); | |
106 | ||
107 | switch (rev) { | |
108 | case 0x00: | |
109 | base = PM_CFG_IOBASE0; | |
110 | break; | |
111 | case 0x01: | |
112 | case 0x10: | |
113 | base = PM_CFG_IOBASE1; | |
114 | break; | |
115 | ||
116 | default: | |
117 | base = PM_CFG_IOBASE1; | |
118 | /* later revision */ | |
119 | } | |
120 | ||
121 | pci_read_config_word(dev, base, &pm_io_base); | |
122 | pm_io_base &= (0xff << 8); | |
123 | ||
d6072f84 | 124 | if (!request_region(I2C_DIR, IOSPACE, vt586b_driver.name)) { |
1da177e4 LT |
125 | dev_err(&dev->dev, "IO 0x%x-0x%x already in use\n", I2C_DIR, I2C_DIR + IOSPACE); |
126 | return -ENODEV; | |
127 | } | |
128 | ||
129 | outb(inb(I2C_DIR) & ~(I2C_SDA | I2C_SCL), I2C_DIR); | |
130 | outb(inb(I2C_OUT) & ~(I2C_SDA | I2C_SCL), I2C_OUT); | |
131 | ||
405ae7d3 | 132 | /* set up the sysfs linkage to our parent device */ |
1da177e4 LT |
133 | vt586b_adapter.dev.parent = &dev->dev; |
134 | ||
135 | res = i2c_bit_add_bus(&vt586b_adapter); | |
136 | if ( res < 0 ) { | |
137 | release_region(I2C_DIR, IOSPACE); | |
138 | pm_io_base = 0; | |
139 | return res; | |
140 | } | |
141 | return 0; | |
142 | } | |
143 | ||
0b255e92 | 144 | static void vt586b_remove(struct pci_dev *dev) |
1da177e4 | 145 | { |
3269711b | 146 | i2c_del_adapter(&vt586b_adapter); |
1da177e4 LT |
147 | release_region(I2C_DIR, IOSPACE); |
148 | pm_io_base = 0; | |
149 | } | |
150 | ||
151 | ||
152 | static struct pci_driver vt586b_driver = { | |
153 | .name = "vt586b_smbus", | |
154 | .id_table = vt586b_ids, | |
155 | .probe = vt586b_probe, | |
0b255e92 | 156 | .remove = vt586b_remove, |
1da177e4 LT |
157 | }; |
158 | ||
56f21788 | 159 | module_pci_driver(vt586b_driver); |
1da177e4 | 160 | |
96de0e25 | 161 | MODULE_AUTHOR("Kyösti Mälkki <kmalkki@cc.hut.fi>"); |
1da177e4 LT |
162 | MODULE_DESCRIPTION("i2c for Via vt82c586b southbridge"); |
163 | MODULE_LICENSE("GPL"); |