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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 i2c Support for Via Technologies 82C586B South Bridge
4
5 Copyright (c) 1998, 1999 Kyösti Mälkki <kmalkki@cc.hut.fi>
6
7*/
8
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/pci.h>
12#include <linux/ioport.h>
13#include <linux/i2c.h>
14#include <linux/i2c-algo-bit.h>
15#include <linux/io.h>
16
17/* Power management registers */
18#define PM_CFG_REVID 0x08 /* silicon revision code */
19#define PM_CFG_IOBASE0 0x20
20#define PM_CFG_IOBASE1 0x48
21
22#define I2C_DIR (pm_io_base+0x40)
23#define I2C_OUT (pm_io_base+0x42)
24#define I2C_IN (pm_io_base+0x44)
25#define I2C_SCL 0x02 /* clock bit in DIR/OUT/IN register */
26#define I2C_SDA 0x04
27
28/* io-region reservation */
29#define IOSPACE 0x06
30
31static struct pci_driver vt586b_driver;
32static u16 pm_io_base;
33
34/*
35 It does not appear from the datasheet that the GPIO pins are
36 open drain. So a we set a low value by setting the direction to
37 output and a high value by setting the direction to input and
38 relying on the required I2C pullup. The data value is initialized
39 to 0 in via_init() and never changed.
40*/
41static void bit_via_setscl(void *data, int state)
42{
43 outb(state ? inb(I2C_DIR) & ~I2C_SCL : inb(I2C_DIR) | I2C_SCL, I2C_DIR);
44}
45
46static void bit_via_setsda(void *data, int state)
47{
48 outb(state ? inb(I2C_DIR) & ~I2C_SDA : inb(I2C_DIR) | I2C_SDA, I2C_DIR);
49}
50
51static int bit_via_getscl(void *data)
52{
53 return (0 != (inb(I2C_IN) & I2C_SCL));
54}
55
56static int bit_via_getsda(void *data)
57{
58 return (0 != (inb(I2C_IN) & I2C_SDA));
59}
60
61
62static struct i2c_algo_bit_data bit_data = {
63 .setsda = bit_via_setsda,
64 .setscl = bit_via_setscl,
65 .getsda = bit_via_getsda,
66 .getscl = bit_via_getscl,
67 .udelay = 5,
68 .timeout = HZ
69};
70
71static struct i2c_adapter vt586b_adapter = {
72 .owner = THIS_MODULE,
73 .class = I2C_CLASS_HWMON,
74 .name = "VIA i2c",
75 .algo_data = &bit_data,
76};
77
78
79static const struct pci_device_id vt586b_ids[] = {
80 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_3) },
81 { 0, }
82};
83
84MODULE_DEVICE_TABLE (pci, vt586b_ids);
85
86static int vt586b_probe(struct pci_dev *dev, const struct pci_device_id *id)
87{
88 u16 base;
89 u8 rev;
90 int res;
91
92 if (pm_io_base) {
93 dev_err(&dev->dev, "i2c-via: Will only support one host\n");
94 return -ENODEV;
95 }
96
97 pci_read_config_byte(dev, PM_CFG_REVID, &rev);
98
99 switch (rev) {
100 case 0x00:
101 base = PM_CFG_IOBASE0;
102 break;
103 case 0x01:
104 case 0x10:
105 base = PM_CFG_IOBASE1;
106 break;
107
108 default:
109 base = PM_CFG_IOBASE1;
110 /* later revision */
111 }
112
113 pci_read_config_word(dev, base, &pm_io_base);
114 pm_io_base &= (0xff << 8);
115
116 if (!request_region(I2C_DIR, IOSPACE, vt586b_driver.name)) {
117 dev_err(&dev->dev, "IO 0x%x-0x%x already in use\n", I2C_DIR, I2C_DIR + IOSPACE);
118 return -ENODEV;
119 }
120
121 outb(inb(I2C_DIR) & ~(I2C_SDA | I2C_SCL), I2C_DIR);
122 outb(inb(I2C_OUT) & ~(I2C_SDA | I2C_SCL), I2C_OUT);
123
124 /* set up the sysfs linkage to our parent device */
125 vt586b_adapter.dev.parent = &dev->dev;
126
127 res = i2c_bit_add_bus(&vt586b_adapter);
128 if ( res < 0 ) {
129 release_region(I2C_DIR, IOSPACE);
130 pm_io_base = 0;
131 return res;
132 }
133 return 0;
134}
135
136static void vt586b_remove(struct pci_dev *dev)
137{
138 i2c_del_adapter(&vt586b_adapter);
139 release_region(I2C_DIR, IOSPACE);
140 pm_io_base = 0;
141}
142
143
144static struct pci_driver vt586b_driver = {
145 .name = "vt586b_smbus",
146 .id_table = vt586b_ids,
147 .probe = vt586b_probe,
148 .remove = vt586b_remove,
149};
150
151module_pci_driver(vt586b_driver);
152
153MODULE_AUTHOR("Kyösti Mälkki <kmalkki@cc.hut.fi>");
154MODULE_DESCRIPTION("i2c for Via vt82c586b southbridge");
155MODULE_LICENSE("GPL");
1/*
2 i2c Support for Via Technologies 82C586B South Bridge
3
4 Copyright (c) 1998, 1999 Kyösti Mälkki <kmalkki@cc.hut.fi>
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.
15*/
16
17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/pci.h>
20#include <linux/ioport.h>
21#include <linux/i2c.h>
22#include <linux/i2c-algo-bit.h>
23#include <linux/io.h>
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
38
39static struct pci_driver vt586b_driver;
40static u16 pm_io_base;
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*/
49static 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
54static 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
59static int bit_via_getscl(void *data)
60{
61 return (0 != (inb(I2C_IN) & I2C_SCL));
62}
63
64static int bit_via_getsda(void *data)
65{
66 return (0 != (inb(I2C_IN) & I2C_SDA));
67}
68
69
70static 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,
76 .timeout = HZ
77};
78
79static struct i2c_adapter vt586b_adapter = {
80 .owner = THIS_MODULE,
81 .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
82 .name = "VIA i2c",
83 .algo_data = &bit_data,
84};
85
86
87static const struct pci_device_id vt586b_ids[] = {
88 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_3) },
89 { 0, }
90};
91
92MODULE_DEVICE_TABLE (pci, vt586b_ids);
93
94static int vt586b_probe(struct pci_dev *dev, const struct pci_device_id *id)
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
124 if (!request_region(I2C_DIR, IOSPACE, vt586b_driver.name)) {
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
132 /* set up the sysfs linkage to our parent device */
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
144static void vt586b_remove(struct pci_dev *dev)
145{
146 i2c_del_adapter(&vt586b_adapter);
147 release_region(I2C_DIR, IOSPACE);
148 pm_io_base = 0;
149}
150
151
152static struct pci_driver vt586b_driver = {
153 .name = "vt586b_smbus",
154 .id_table = vt586b_ids,
155 .probe = vt586b_probe,
156 .remove = vt586b_remove,
157};
158
159module_pci_driver(vt586b_driver);
160
161MODULE_AUTHOR("Kyösti Mälkki <kmalkki@cc.hut.fi>");
162MODULE_DESCRIPTION("i2c for Via vt82c586b southbridge");
163MODULE_LICENSE("GPL");