Commit | Line | Data |
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1da177e4 | 1 | /* |
7785925d | 2 | * matrox_w1.c |
1da177e4 LT |
3 | * |
4 | * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> | |
7785925d | 5 | * |
1da177e4 LT |
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 | ||
1da177e4 | 22 | #include <asm/types.h> |
bd529cfb | 23 | #include <asm/atomic.h> |
1da177e4 LT |
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> | |
1da177e4 | 36 | |
bd529cfb EP |
37 | #include "../w1.h" |
38 | #include "../w1_int.h" | |
39 | #include "../w1_log.h" | |
1da177e4 LT |
40 | |
41 | MODULE_LICENSE("GPL"); | |
42 | MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>"); | |
43 | MODULE_DESCRIPTION("Driver for transport(Dallas 1-wire prtocol) over VGA DDC(matrox gpio)."); | |
44 | ||
45 | static struct pci_device_id matrox_w1_tbl[] = { | |
46 | { PCI_DEVICE(PCI_VENDOR_ID_MATROX, PCI_DEVICE_ID_MATROX_G400) }, | |
47 | { }, | |
48 | }; | |
49 | MODULE_DEVICE_TABLE(pci, matrox_w1_tbl); | |
50 | ||
51 | static int __devinit matrox_w1_probe(struct pci_dev *, const struct pci_device_id *); | |
52 | static void __devexit matrox_w1_remove(struct pci_dev *); | |
53 | ||
54 | static struct pci_driver matrox_w1_pci_driver = { | |
55 | .name = "matrox_w1", | |
56 | .id_table = matrox_w1_tbl, | |
57 | .probe = matrox_w1_probe, | |
58 | .remove = __devexit_p(matrox_w1_remove), | |
59 | }; | |
60 | ||
7785925d | 61 | /* |
1da177e4 LT |
62 | * Matrox G400 DDC registers. |
63 | */ | |
64 | ||
65 | #define MATROX_G400_DDC_CLK (1<<4) | |
66 | #define MATROX_G400_DDC_DATA (1<<1) | |
67 | ||
68 | #define MATROX_BASE 0x3C00 | |
69 | #define MATROX_STATUS 0x1e14 | |
70 | ||
71 | #define MATROX_PORT_INDEX_OFFSET 0x00 | |
72 | #define MATROX_PORT_DATA_OFFSET 0x0A | |
73 | ||
74 | #define MATROX_GET_CONTROL 0x2A | |
75 | #define MATROX_GET_DATA 0x2B | |
76 | #define MATROX_CURSOR_CTL 0x06 | |
77 | ||
78 | struct matrox_device | |
79 | { | |
80 | void __iomem *base_addr; | |
81 | void __iomem *port_index; | |
82 | void __iomem *port_data; | |
83 | u8 data_mask; | |
84 | ||
85 | unsigned long phys_addr; | |
86 | void __iomem *virt_addr; | |
87 | unsigned long found; | |
88 | ||
89 | struct w1_bus_master *bus_master; | |
90 | }; | |
91 | ||
ccd69940 EP |
92 | static u8 matrox_w1_read_ddc_bit(void *); |
93 | static void matrox_w1_write_ddc_bit(void *, u8); | |
1da177e4 LT |
94 | |
95 | /* | |
96 | * These functions read and write DDC Data bit. | |
97 | * | |
98 | * Using tristate pins, since i can't find any open-drain pin in whole motherboard. | |
99 | * Unfortunately we can't connect to Intel's 82801xx IO controller | |
c30fe7f7 | 100 | * since we don't know motherboard schema, which has pretty unused(may be not) GPIO. |
1da177e4 LT |
101 | * |
102 | * I've heard that PIIX also has open drain pin. | |
103 | * | |
104 | * Port mapping. | |
105 | */ | |
106 | static __inline__ u8 matrox_w1_read_reg(struct matrox_device *dev, u8 reg) | |
107 | { | |
108 | u8 ret; | |
109 | ||
110 | writeb(reg, dev->port_index); | |
111 | ret = readb(dev->port_data); | |
112 | barrier(); | |
113 | ||
114 | return ret; | |
115 | } | |
116 | ||
117 | static __inline__ void matrox_w1_write_reg(struct matrox_device *dev, u8 reg, u8 val) | |
118 | { | |
119 | writeb(reg, dev->port_index); | |
120 | writeb(val, dev->port_data); | |
121 | wmb(); | |
122 | } | |
123 | ||
ccd69940 | 124 | static void matrox_w1_write_ddc_bit(void *data, u8 bit) |
1da177e4 LT |
125 | { |
126 | u8 ret; | |
ccd69940 | 127 | struct matrox_device *dev = data; |
1da177e4 LT |
128 | |
129 | if (bit) | |
130 | bit = 0; | |
131 | else | |
132 | bit = dev->data_mask; | |
133 | ||
134 | ret = matrox_w1_read_reg(dev, MATROX_GET_CONTROL); | |
135 | matrox_w1_write_reg(dev, MATROX_GET_CONTROL, ((ret & ~dev->data_mask) | bit)); | |
136 | matrox_w1_write_reg(dev, MATROX_GET_DATA, 0x00); | |
137 | } | |
138 | ||
ccd69940 | 139 | static u8 matrox_w1_read_ddc_bit(void *data) |
1da177e4 LT |
140 | { |
141 | u8 ret; | |
ccd69940 | 142 | struct matrox_device *dev = data; |
1da177e4 LT |
143 | |
144 | ret = matrox_w1_read_reg(dev, MATROX_GET_DATA); | |
145 | ||
146 | return ret; | |
147 | } | |
148 | ||
149 | static void matrox_w1_hw_init(struct matrox_device *dev) | |
150 | { | |
151 | matrox_w1_write_reg(dev, MATROX_GET_DATA, 0xFF); | |
152 | matrox_w1_write_reg(dev, MATROX_GET_CONTROL, 0x00); | |
153 | } | |
154 | ||
155 | static int __devinit matrox_w1_probe(struct pci_dev *pdev, const struct pci_device_id *ent) | |
156 | { | |
157 | struct matrox_device *dev; | |
158 | int err; | |
159 | ||
160 | assert(pdev != NULL); | |
161 | assert(ent != NULL); | |
162 | ||
163 | if (pdev->vendor != PCI_VENDOR_ID_MATROX || pdev->device != PCI_DEVICE_ID_MATROX_G400) | |
164 | return -ENODEV; | |
165 | ||
dd00cc48 | 166 | dev = kzalloc(sizeof(struct matrox_device) + |
1da177e4 LT |
167 | sizeof(struct w1_bus_master), GFP_KERNEL); |
168 | if (!dev) { | |
169 | dev_err(&pdev->dev, | |
170 | "%s: Failed to create new matrox_device object.\n", | |
171 | __func__); | |
172 | return -ENOMEM; | |
173 | } | |
174 | ||
1da177e4 LT |
175 | |
176 | dev->bus_master = (struct w1_bus_master *)(dev + 1); | |
177 | ||
7785925d EP |
178 | /* |
179 | * True for G400, for some other we need resource 0, see drivers/video/matrox/matroxfb_base.c | |
1da177e4 LT |
180 | */ |
181 | ||
182 | dev->phys_addr = pci_resource_start(pdev, 1); | |
183 | ||
184 | dev->virt_addr = ioremap_nocache(dev->phys_addr, 16384); | |
185 | if (!dev->virt_addr) { | |
186 | dev_err(&pdev->dev, "%s: failed to ioremap(0x%lx, %d).\n", | |
187 | __func__, dev->phys_addr, 16384); | |
188 | err = -EIO; | |
189 | goto err_out_free_device; | |
190 | } | |
191 | ||
192 | dev->base_addr = dev->virt_addr + MATROX_BASE; | |
193 | dev->port_index = dev->base_addr + MATROX_PORT_INDEX_OFFSET; | |
194 | dev->port_data = dev->base_addr + MATROX_PORT_DATA_OFFSET; | |
195 | dev->data_mask = (MATROX_G400_DDC_DATA); | |
196 | ||
197 | matrox_w1_hw_init(dev); | |
198 | ||
ccd69940 | 199 | dev->bus_master->data = dev; |
1da177e4 LT |
200 | dev->bus_master->read_bit = &matrox_w1_read_ddc_bit; |
201 | dev->bus_master->write_bit = &matrox_w1_write_ddc_bit; | |
202 | ||
203 | err = w1_add_master_device(dev->bus_master); | |
204 | if (err) | |
205 | goto err_out_free_device; | |
206 | ||
207 | pci_set_drvdata(pdev, dev); | |
208 | ||
209 | dev->found = 1; | |
210 | ||
211 | dev_info(&pdev->dev, "Matrox G400 GPIO transport layer for 1-wire.\n"); | |
212 | ||
213 | return 0; | |
214 | ||
215 | err_out_free_device: | |
e45413eb AL |
216 | if (dev->virt_addr) |
217 | iounmap(dev->virt_addr); | |
1da177e4 LT |
218 | kfree(dev); |
219 | ||
220 | return err; | |
221 | } | |
222 | ||
223 | static 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 | ||
236 | static int __init matrox_w1_init(void) | |
237 | { | |
238 | return pci_register_driver(&matrox_w1_pci_driver); | |
239 | } | |
240 | ||
241 | static void __exit matrox_w1_fini(void) | |
242 | { | |
243 | pci_unregister_driver(&matrox_w1_pci_driver); | |
244 | } | |
245 | ||
246 | module_init(matrox_w1_init); | |
247 | module_exit(matrox_w1_fini); |