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1da177e4 LT |
1 | /* |
2 | * kernel/busses/i2c-prosavage.c | |
3 | * | |
4 | * i2c bus driver for S3/VIA 8365/8375 graphics processor. | |
5 | * Copyright (c) 2003 Henk Vergonet <henk@god.dyndns.org> | |
6 | * Based on code written by: | |
7 | * Frodo Looijaard <frodol@dds.nl>, | |
8 | * Philip Edelbrock <phil@netroedge.com>, | |
9 | * Ralph Metzler <rjkm@thp.uni-koeln.de>, and | |
10 | * Mark D. Studebaker <mdsxyz123@yahoo.com> | |
11 | * Simon Vogl | |
12 | * and others | |
13 | * | |
14 | * Please read the lm_sensors documentation for details on use. | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License as published by | |
18 | * the Free Software Foundation; either version 2 of the License, or | |
19 | * (at your option) any later version. | |
20 | * | |
21 | * This program is distributed in the hope that it will be useful, | |
22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24 | * GNU General Public License for more details. | |
25 | * | |
26 | * You should have received a copy of the GNU General Public License | |
27 | * along with this program; if not, write to the Free Software | |
28 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
29 | * | |
30 | */ | |
31 | /* 18-05-2003 HVE - created | |
32 | * 14-06-2003 HVE - adapted for lm_sensors2 | |
33 | * 17-06-2003 HVE - linux 2.5.xx compatible | |
34 | * 18-06-2003 HVE - codingstyle | |
35 | * 21-06-2003 HVE - compatibility lm_sensors2 and linux 2.5.xx | |
36 | * codingstyle, mmio enabled | |
37 | * | |
38 | * This driver interfaces to the I2C bus of the VIA north bridge embedded | |
39 | * ProSavage4/8 devices. Usefull for gaining access to the TV Encoder chips. | |
40 | * | |
41 | * Graphics cores: | |
42 | * S3/VIA KM266/VT8375 aka ProSavage8 | |
43 | * S3/VIA KM133/VT8365 aka Savage4 | |
44 | * | |
45 | * Two serial busses are implemented: | |
46 | * SERIAL1 - I2C serial communications interface | |
47 | * SERIAL2 - DDC2 monitor communications interface | |
48 | * | |
49 | * Tested on a FX41 mainboard, see http://www.shuttle.com | |
50 | * | |
51 | * | |
52 | * TODO: | |
53 | * - integration with prosavage framebuffer device | |
54 | * (Additional documentation needed :( | |
55 | */ | |
56 | ||
1da177e4 LT |
57 | #include <linux/module.h> |
58 | #include <linux/init.h> | |
59 | #include <linux/pci.h> | |
60 | #include <linux/i2c.h> | |
61 | #include <linux/i2c-algo-bit.h> | |
62 | #include <asm/io.h> | |
63 | ||
64 | /* | |
65 | * driver configuration | |
66 | */ | |
67 | #define MAX_BUSSES 2 | |
68 | ||
69 | struct s_i2c_bus { | |
70 | void __iomem *mmvga; | |
71 | int i2c_reg; | |
72 | int adap_ok; | |
73 | struct i2c_adapter adap; | |
74 | struct i2c_algo_bit_data algo; | |
75 | }; | |
76 | ||
77 | struct s_i2c_chip { | |
78 | void __iomem *mmio; | |
79 | struct s_i2c_bus i2c_bus[MAX_BUSSES]; | |
80 | }; | |
81 | ||
82 | ||
83 | /* | |
84 | * i2c configuration | |
85 | */ | |
1da177e4 LT |
86 | #define CYCLE_DELAY 10 |
87 | #define TIMEOUT (HZ / 2) | |
88 | ||
89 | ||
90 | /* | |
91 | * S3/VIA 8365/8375 registers | |
92 | */ | |
93 | #define VGA_CR_IX 0x3d4 | |
94 | #define VGA_CR_DATA 0x3d5 | |
95 | ||
96 | #define CR_SERIAL1 0xa0 /* I2C serial communications interface */ | |
97 | #define MM_SERIAL1 0xff20 | |
98 | #define CR_SERIAL2 0xb1 /* DDC2 monitor communications interface */ | |
99 | ||
100 | /* based on vt8365 documentation */ | |
101 | #define I2C_ENAB 0x10 | |
102 | #define I2C_SCL_OUT 0x01 | |
103 | #define I2C_SDA_OUT 0x02 | |
104 | #define I2C_SCL_IN 0x04 | |
105 | #define I2C_SDA_IN 0x08 | |
106 | ||
107 | #define SET_CR_IX(p, val) writeb((val), (p)->mmvga + VGA_CR_IX) | |
108 | #define SET_CR_DATA(p, val) writeb((val), (p)->mmvga + VGA_CR_DATA) | |
109 | #define GET_CR_DATA(p) readb((p)->mmvga + VGA_CR_DATA) | |
110 | ||
111 | ||
112 | /* | |
113 | * Serial bus line handling | |
114 | * | |
115 | * serial communications register as parameter in private data | |
116 | * | |
117 | * TODO: locks with other code sections accessing video registers? | |
118 | */ | |
119 | static void bit_s3via_setscl(void *bus, int val) | |
120 | { | |
121 | struct s_i2c_bus *p = (struct s_i2c_bus *)bus; | |
122 | unsigned int r; | |
123 | ||
124 | SET_CR_IX(p, p->i2c_reg); | |
125 | r = GET_CR_DATA(p); | |
126 | r |= I2C_ENAB; | |
127 | if (val) { | |
128 | r |= I2C_SCL_OUT; | |
129 | } else { | |
130 | r &= ~I2C_SCL_OUT; | |
131 | } | |
132 | SET_CR_DATA(p, r); | |
133 | } | |
134 | ||
135 | static void bit_s3via_setsda(void *bus, int val) | |
136 | { | |
137 | struct s_i2c_bus *p = (struct s_i2c_bus *)bus; | |
138 | unsigned int r; | |
139 | ||
140 | SET_CR_IX(p, p->i2c_reg); | |
141 | r = GET_CR_DATA(p); | |
142 | r |= I2C_ENAB; | |
143 | if (val) { | |
144 | r |= I2C_SDA_OUT; | |
145 | } else { | |
146 | r &= ~I2C_SDA_OUT; | |
147 | } | |
148 | SET_CR_DATA(p, r); | |
149 | } | |
150 | ||
151 | static int bit_s3via_getscl(void *bus) | |
152 | { | |
153 | struct s_i2c_bus *p = (struct s_i2c_bus *)bus; | |
154 | ||
155 | SET_CR_IX(p, p->i2c_reg); | |
156 | return (0 != (GET_CR_DATA(p) & I2C_SCL_IN)); | |
157 | } | |
158 | ||
159 | static int bit_s3via_getsda(void *bus) | |
160 | { | |
161 | struct s_i2c_bus *p = (struct s_i2c_bus *)bus; | |
162 | ||
163 | SET_CR_IX(p, p->i2c_reg); | |
164 | return (0 != (GET_CR_DATA(p) & I2C_SDA_IN)); | |
165 | } | |
166 | ||
167 | ||
168 | /* | |
169 | * adapter initialisation | |
170 | */ | |
171 | static int i2c_register_bus(struct pci_dev *dev, struct s_i2c_bus *p, void __iomem *mmvga, u32 i2c_reg) | |
172 | { | |
173 | int ret; | |
174 | p->adap.owner = THIS_MODULE; | |
175 | p->adap.id = I2C_HW_B_S3VIA; | |
176 | p->adap.algo_data = &p->algo; | |
177 | p->adap.dev.parent = &dev->dev; | |
178 | p->algo.setsda = bit_s3via_setsda; | |
179 | p->algo.setscl = bit_s3via_setscl; | |
180 | p->algo.getsda = bit_s3via_getsda; | |
181 | p->algo.getscl = bit_s3via_getscl; | |
182 | p->algo.udelay = CYCLE_DELAY; | |
1da177e4 LT |
183 | p->algo.timeout = TIMEOUT; |
184 | p->algo.data = p; | |
185 | p->mmvga = mmvga; | |
186 | p->i2c_reg = i2c_reg; | |
187 | ||
188 | ret = i2c_bit_add_bus(&p->adap); | |
189 | if (ret) { | |
190 | return ret; | |
191 | } | |
192 | ||
193 | p->adap_ok = 1; | |
194 | return 0; | |
195 | } | |
196 | ||
197 | ||
198 | /* | |
199 | * Cleanup stuff | |
200 | */ | |
201 | static void prosavage_remove(struct pci_dev *dev) | |
202 | { | |
203 | struct s_i2c_chip *chip; | |
204 | int i, ret; | |
205 | ||
206 | chip = (struct s_i2c_chip *)pci_get_drvdata(dev); | |
207 | ||
208 | if (!chip) { | |
209 | return; | |
210 | } | |
211 | for (i = MAX_BUSSES - 1; i >= 0; i--) { | |
212 | if (chip->i2c_bus[i].adap_ok == 0) | |
213 | continue; | |
214 | ||
3269711b | 215 | ret = i2c_del_adapter(&chip->i2c_bus[i].adap); |
1da177e4 LT |
216 | if (ret) { |
217 | dev_err(&dev->dev, "%s not removed\n", | |
218 | chip->i2c_bus[i].adap.name); | |
219 | } | |
220 | } | |
221 | if (chip->mmio) { | |
222 | iounmap(chip->mmio); | |
223 | } | |
224 | kfree(chip); | |
225 | } | |
226 | ||
227 | ||
228 | /* | |
229 | * Detect chip and initialize it | |
230 | */ | |
231 | static int __devinit prosavage_probe(struct pci_dev *dev, const struct pci_device_id *id) | |
232 | { | |
233 | int ret; | |
234 | unsigned long base, len; | |
235 | struct s_i2c_chip *chip; | |
236 | struct s_i2c_bus *bus; | |
237 | ||
5263ebb5 | 238 | pci_set_drvdata(dev, kzalloc(sizeof(struct s_i2c_chip), GFP_KERNEL)); |
1da177e4 LT |
239 | chip = (struct s_i2c_chip *)pci_get_drvdata(dev); |
240 | if (chip == NULL) { | |
241 | return -ENOMEM; | |
242 | } | |
243 | ||
1da177e4 LT |
244 | base = dev->resource[0].start & PCI_BASE_ADDRESS_MEM_MASK; |
245 | len = dev->resource[0].end - base + 1; | |
246 | chip->mmio = ioremap_nocache(base, len); | |
247 | ||
248 | if (chip->mmio == NULL) { | |
249 | dev_err(&dev->dev, "ioremap failed\n"); | |
250 | prosavage_remove(dev); | |
251 | return -ENODEV; | |
252 | } | |
253 | ||
254 | ||
255 | /* | |
256 | * Chip initialisation | |
257 | */ | |
258 | /* Unlock Extended IO Space ??? */ | |
259 | ||
260 | ||
261 | /* | |
262 | * i2c bus registration | |
263 | */ | |
264 | bus = &chip->i2c_bus[0]; | |
265 | snprintf(bus->adap.name, sizeof(bus->adap.name), | |
266 | "ProSavage I2C bus at %02x:%02x.%x", | |
267 | dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); | |
268 | ret = i2c_register_bus(dev, bus, chip->mmio + 0x8000, CR_SERIAL1); | |
269 | if (ret) { | |
270 | goto err_adap; | |
271 | } | |
272 | /* | |
273 | * ddc bus registration | |
274 | */ | |
275 | bus = &chip->i2c_bus[1]; | |
276 | snprintf(bus->adap.name, sizeof(bus->adap.name), | |
277 | "ProSavage DDC bus at %02x:%02x.%x", | |
278 | dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); | |
279 | ret = i2c_register_bus(dev, bus, chip->mmio + 0x8000, CR_SERIAL2); | |
280 | if (ret) { | |
281 | goto err_adap; | |
282 | } | |
283 | return 0; | |
284 | err_adap: | |
285 | dev_err(&dev->dev, "%s failed\n", bus->adap.name); | |
286 | prosavage_remove(dev); | |
287 | return ret; | |
288 | } | |
289 | ||
290 | ||
291 | /* | |
292 | * Data for PCI driver interface | |
293 | */ | |
294 | static struct pci_device_id prosavage_pci_tbl[] = { | |
295 | { PCI_DEVICE(PCI_VENDOR_ID_S3, PCI_DEVICE_ID_S3_SAVAGE4) }, | |
296 | { PCI_DEVICE(PCI_VENDOR_ID_S3, PCI_DEVICE_ID_S3_PROSAVAGE8) }, | |
297 | { 0, }, | |
298 | }; | |
299 | ||
300 | MODULE_DEVICE_TABLE (pci, prosavage_pci_tbl); | |
301 | ||
302 | static struct pci_driver prosavage_driver = { | |
303 | .name = "prosavage_smbus", | |
304 | .id_table = prosavage_pci_tbl, | |
305 | .probe = prosavage_probe, | |
306 | .remove = prosavage_remove, | |
307 | }; | |
308 | ||
309 | static int __init i2c_prosavage_init(void) | |
310 | { | |
311 | return pci_register_driver(&prosavage_driver); | |
312 | } | |
313 | ||
314 | static void __exit i2c_prosavage_exit(void) | |
315 | { | |
316 | pci_unregister_driver(&prosavage_driver); | |
317 | } | |
318 | ||
319 | MODULE_DEVICE_TABLE(pci, prosavage_pci_tbl); | |
320 | MODULE_AUTHOR("Henk Vergonet"); | |
321 | MODULE_DESCRIPTION("ProSavage VIA 8365/8375 smbus driver"); | |
322 | MODULE_LICENSE("GPL"); | |
323 | ||
324 | module_init (i2c_prosavage_init); | |
325 | module_exit (i2c_prosavage_exit); |