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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * matrox_w1.c
3 *
4 * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
5 *
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 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22#include <asm/atomic.h>
23#include <asm/types.h>
24#include <asm/io.h>
25
26#include <linux/delay.h>
27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/list.h>
30#include <linux/interrupt.h>
31#include <linux/spinlock.h>
32#include <linux/timer.h>
33#include <linux/slab.h>
34#include <linux/pci_ids.h>
35#include <linux/pci.h>
36#include <linux/timer.h>
37
38#include "w1.h"
39#include "w1_int.h"
40#include "w1_log.h"
41
42MODULE_LICENSE("GPL");
43MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
44MODULE_DESCRIPTION("Driver for transport(Dallas 1-wire prtocol) over VGA DDC(matrox gpio).");
45
46static struct pci_device_id matrox_w1_tbl[] = {
47 { PCI_DEVICE(PCI_VENDOR_ID_MATROX, PCI_DEVICE_ID_MATROX_G400) },
48 { },
49};
50MODULE_DEVICE_TABLE(pci, matrox_w1_tbl);
51
52static int __devinit matrox_w1_probe(struct pci_dev *, const struct pci_device_id *);
53static void __devexit matrox_w1_remove(struct pci_dev *);
54
55static struct pci_driver matrox_w1_pci_driver = {
56 .name = "matrox_w1",
57 .id_table = matrox_w1_tbl,
58 .probe = matrox_w1_probe,
59 .remove = __devexit_p(matrox_w1_remove),
60};
61
62/*
63 * Matrox G400 DDC registers.
64 */
65
66#define MATROX_G400_DDC_CLK (1<<4)
67#define MATROX_G400_DDC_DATA (1<<1)
68
69#define MATROX_BASE 0x3C00
70#define MATROX_STATUS 0x1e14
71
72#define MATROX_PORT_INDEX_OFFSET 0x00
73#define MATROX_PORT_DATA_OFFSET 0x0A
74
75#define MATROX_GET_CONTROL 0x2A
76#define MATROX_GET_DATA 0x2B
77#define MATROX_CURSOR_CTL 0x06
78
79struct matrox_device
80{
81 void __iomem *base_addr;
82 void __iomem *port_index;
83 void __iomem *port_data;
84 u8 data_mask;
85
86 unsigned long phys_addr;
87 void __iomem *virt_addr;
88 unsigned long found;
89
90 struct w1_bus_master *bus_master;
91};
92
93static u8 matrox_w1_read_ddc_bit(unsigned long);
94static void matrox_w1_write_ddc_bit(unsigned long, u8);
95
96/*
97 * These functions read and write DDC Data bit.
98 *
99 * Using tristate pins, since i can't find any open-drain pin in whole motherboard.
100 * Unfortunately we can't connect to Intel's 82801xx IO controller
101 * since we don't know motherboard schema, wich has pretty unused(may be not) GPIO.
102 *
103 * I've heard that PIIX also has open drain pin.
104 *
105 * Port mapping.
106 */
107static __inline__ u8 matrox_w1_read_reg(struct matrox_device *dev, u8 reg)
108{
109 u8 ret;
110
111 writeb(reg, dev->port_index);
112 ret = readb(dev->port_data);
113 barrier();
114
115 return ret;
116}
117
118static __inline__ void matrox_w1_write_reg(struct matrox_device *dev, u8 reg, u8 val)
119{
120 writeb(reg, dev->port_index);
121 writeb(val, dev->port_data);
122 wmb();
123}
124
125static void matrox_w1_write_ddc_bit(unsigned long data, u8 bit)
126{
127 u8 ret;
128 struct matrox_device *dev = (struct matrox_device *) data;
129
130 if (bit)
131 bit = 0;
132 else
133 bit = dev->data_mask;
134
135 ret = matrox_w1_read_reg(dev, MATROX_GET_CONTROL);
136 matrox_w1_write_reg(dev, MATROX_GET_CONTROL, ((ret & ~dev->data_mask) | bit));
137 matrox_w1_write_reg(dev, MATROX_GET_DATA, 0x00);
138}
139
140static u8 matrox_w1_read_ddc_bit(unsigned long data)
141{
142 u8 ret;
143 struct matrox_device *dev = (struct matrox_device *) data;
144
145 ret = matrox_w1_read_reg(dev, MATROX_GET_DATA);
146
147 return ret;
148}
149
150static void matrox_w1_hw_init(struct matrox_device *dev)
151{
152 matrox_w1_write_reg(dev, MATROX_GET_DATA, 0xFF);
153 matrox_w1_write_reg(dev, MATROX_GET_CONTROL, 0x00);
154}
155
156static int __devinit matrox_w1_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
157{
158 struct matrox_device *dev;
159 int err;
160
161 assert(pdev != NULL);
162 assert(ent != NULL);
163
164 if (pdev->vendor != PCI_VENDOR_ID_MATROX || pdev->device != PCI_DEVICE_ID_MATROX_G400)
165 return -ENODEV;
166
167 dev = kmalloc(sizeof(struct matrox_device) +
168 sizeof(struct w1_bus_master), GFP_KERNEL);
169 if (!dev) {
170 dev_err(&pdev->dev,
171 "%s: Failed to create new matrox_device object.\n",
172 __func__);
173 return -ENOMEM;
174 }
175
176 memset(dev, 0, sizeof(struct matrox_device) + sizeof(struct w1_bus_master));
177
178 dev->bus_master = (struct w1_bus_master *)(dev + 1);
179
180 /*
181 * True for G400, for some other we need resource 0, see drivers/video/matrox/matroxfb_base.c
182 */
183
184 dev->phys_addr = pci_resource_start(pdev, 1);
185
186 dev->virt_addr = ioremap_nocache(dev->phys_addr, 16384);
187 if (!dev->virt_addr) {
188 dev_err(&pdev->dev, "%s: failed to ioremap(0x%lx, %d).\n",
189 __func__, dev->phys_addr, 16384);
190 err = -EIO;
191 goto err_out_free_device;
192 }
193
194 dev->base_addr = dev->virt_addr + MATROX_BASE;
195 dev->port_index = dev->base_addr + MATROX_PORT_INDEX_OFFSET;
196 dev->port_data = dev->base_addr + MATROX_PORT_DATA_OFFSET;
197 dev->data_mask = (MATROX_G400_DDC_DATA);
198
199 matrox_w1_hw_init(dev);
200
201 dev->bus_master->data = (unsigned long) dev;
202 dev->bus_master->read_bit = &matrox_w1_read_ddc_bit;
203 dev->bus_master->write_bit = &matrox_w1_write_ddc_bit;
204
205 err = w1_add_master_device(dev->bus_master);
206 if (err)
207 goto err_out_free_device;
208
209 pci_set_drvdata(pdev, dev);
210
211 dev->found = 1;
212
213 dev_info(&pdev->dev, "Matrox G400 GPIO transport layer for 1-wire.\n");
214
215 return 0;
216
217err_out_free_device:
218 kfree(dev);
219
220 return err;
221}
222
223static void __devexit matrox_w1_remove(struct pci_dev *pdev)
224{
225 struct matrox_device *dev = pci_get_drvdata(pdev);
226
227 assert(dev != NULL);
228
229 if (dev->found) {
230 w1_remove_master_device(dev->bus_master);
231 iounmap(dev->virt_addr);
232 }
233 kfree(dev);
234}
235
236static int __init matrox_w1_init(void)
237{
238 return pci_register_driver(&matrox_w1_pci_driver);
239}
240
241static void __exit matrox_w1_fini(void)
242{
243 pci_unregister_driver(&matrox_w1_pci_driver);
244}
245
246module_init(matrox_w1_init);
247module_exit(matrox_w1_fini);