initial commit with v2.6.9
[linux-2.6.9-moxart.git] / drivers / w1 / matrox_w1.c
blob44abe37e40b50116d85c48f0b499eaf7c9d42ac7
1 /*
2 * matrox_w1.c
4 * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
5 *
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.
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.
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
22 #include <asm/atomic.h>
23 #include <asm/types.h>
24 #include <asm/io.h>
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>
38 #include "w1.h"
39 #include "w1_int.h"
40 #include "w1_log.h"
42 MODULE_LICENSE("GPL");
43 MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
44 MODULE_DESCRIPTION("Driver for transport(Dallas 1-wire prtocol) over VGA DDC(matrox gpio).");
46 static struct pci_device_id matrox_w1_tbl[] = {
47 { PCI_DEVICE(PCI_VENDOR_ID_MATROX, PCI_DEVICE_ID_MATROX_G400) },
48 { },
50 MODULE_DEVICE_TABLE(pci, matrox_w1_tbl);
52 static int __devinit matrox_w1_probe(struct pci_dev *, const struct pci_device_id *);
53 static void __devexit matrox_w1_remove(struct pci_dev *);
55 static 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),
62 /*
63 * Matrox G400 DDC registers.
66 #define MATROX_G400_DDC_CLK (1<<4)
67 #define MATROX_G400_DDC_DATA (1<<1)
69 #define MATROX_BASE 0x3C00
70 #define MATROX_STATUS 0x1e14
72 #define MATROX_PORT_INDEX_OFFSET 0x00
73 #define MATROX_PORT_DATA_OFFSET 0x0A
75 #define MATROX_GET_CONTROL 0x2A
76 #define MATROX_GET_DATA 0x2B
77 #define MATROX_CURSOR_CTL 0x06
79 struct matrox_device
81 unsigned long base_addr;
82 unsigned long port_index, port_data;
83 u8 data_mask;
85 unsigned long phys_addr, virt_addr;
86 unsigned long found;
88 struct w1_bus_master *bus_master;
91 static u8 matrox_w1_read_ddc_bit(unsigned long);
92 static void matrox_w1_write_ddc_bit(unsigned long, u8);
95 * These functions read and write DDC Data bit.
97 * Using tristate pins, since i can't find any open-drain pin in whole motherboard.
98 * Unfortunately we can't connect to Intel's 82801xx IO controller
99 * since we don't know motherboard schema, wich has pretty unused(may be not) GPIO.
101 * I've heard that PIIX also has open drain pin.
103 * Port mapping.
105 static __inline__ u8 matrox_w1_read_reg(struct matrox_device *dev, u8 reg)
107 u8 ret;
109 writeb(reg, dev->port_index);
110 ret = readb(dev->port_data);
111 barrier();
113 return ret;
116 static __inline__ void matrox_w1_write_reg(struct matrox_device *dev, u8 reg, u8 val)
118 writeb(reg, dev->port_index);
119 writeb(val, dev->port_data);
120 wmb();
123 static void matrox_w1_write_ddc_bit(unsigned long data, u8 bit)
125 u8 ret;
126 struct matrox_device *dev = (struct matrox_device *) data;
128 if (bit)
129 bit = 0;
130 else
131 bit = dev->data_mask;
133 ret = matrox_w1_read_reg(dev, MATROX_GET_CONTROL);
134 matrox_w1_write_reg(dev, MATROX_GET_CONTROL, ((ret & ~dev->data_mask) | bit));
135 matrox_w1_write_reg(dev, MATROX_GET_DATA, 0x00);
138 static u8 matrox_w1_read_ddc_bit(unsigned long data)
140 u8 ret;
141 struct matrox_device *dev = (struct matrox_device *) data;
143 ret = matrox_w1_read_reg(dev, MATROX_GET_DATA);
145 return ret;
148 static void matrox_w1_hw_init(struct matrox_device *dev)
150 matrox_w1_write_reg(dev, MATROX_GET_DATA, 0xFF);
151 matrox_w1_write_reg(dev, MATROX_GET_CONTROL, 0x00);
154 static int __devinit matrox_w1_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
156 struct matrox_device *dev;
157 int err;
159 assert(pdev != NULL);
160 assert(ent != NULL);
162 if (pdev->vendor != PCI_VENDOR_ID_MATROX || pdev->device != PCI_DEVICE_ID_MATROX_G400)
163 return -ENODEV;
165 dev = kmalloc(sizeof(struct matrox_device) +
166 sizeof(struct w1_bus_master), GFP_KERNEL);
167 if (!dev) {
168 dev_err(&pdev->dev,
169 "%s: Failed to create new matrox_device object.\n",
170 __func__);
171 return -ENOMEM;
174 memset(dev, 0, sizeof(struct matrox_device) + sizeof(struct w1_bus_master));
176 dev->bus_master = (struct w1_bus_master *)(dev + 1);
179 * True for G400, for some other we need resource 0, see drivers/video/matrox/matroxfb_base.c
182 dev->phys_addr = pci_resource_start(pdev, 1);
184 dev->virt_addr =
185 (unsigned long) ioremap_nocache(dev->phys_addr, 16384);
186 if (!dev->virt_addr) {
187 dev_err(&pdev->dev, "%s: failed to ioremap(0x%lx, %d).\n",
188 __func__, dev->phys_addr, 16384);
189 err = -EIO;
190 goto err_out_free_device;
193 dev->base_addr = dev->virt_addr + MATROX_BASE;
194 dev->port_index = dev->base_addr + MATROX_PORT_INDEX_OFFSET;
195 dev->port_data = dev->base_addr + MATROX_PORT_DATA_OFFSET;
196 dev->data_mask = (MATROX_G400_DDC_DATA);
198 matrox_w1_hw_init(dev);
200 dev->bus_master->data = (unsigned long) dev;
201 dev->bus_master->read_bit = &matrox_w1_read_ddc_bit;
202 dev->bus_master->write_bit = &matrox_w1_write_ddc_bit;
204 err = w1_add_master_device(dev->bus_master);
205 if (err)
206 goto err_out_free_device;
208 pci_set_drvdata(pdev, dev);
210 dev->found = 1;
212 dev_info(&pdev->dev, "Matrox G400 GPIO transport layer for 1-wire.\n");
214 return 0;
216 err_out_free_device:
217 kfree(dev);
219 return err;
222 static void __devexit matrox_w1_remove(struct pci_dev *pdev)
224 struct matrox_device *dev = pci_get_drvdata(pdev);
226 assert(dev != NULL);
228 if (dev->found) {
229 w1_remove_master_device(dev->bus_master);
230 iounmap((void *) dev->virt_addr);
232 kfree(dev);
235 static int __init matrox_w1_init(void)
237 return pci_module_init(&matrox_w1_pci_driver);
240 static void __exit matrox_w1_fini(void)
242 pci_unregister_driver(&matrox_w1_pci_driver);
245 module_init(matrox_w1_init);
246 module_exit(matrox_w1_fini);