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kbuild: document howto build external modules using several directories
[linux-2.6/verdex.git] / drivers / video / savage / savagefb-i2c.c
blob3c98457783c42f4caf050c9c14060bef5cb583ac
1 /*
2 * linux/drivers/video/savage/savagefb-i2c.c - S3 Savage DDC2
3 *
4 * Copyright 2004 Antonino A. Daplas <adaplas @pol.net>
5 *
6 * Based partly on rivafb-i2c.c
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file COPYING in the main directory of this archive
10 * for more details.
11 */
12
13 #include <linux/config.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/sched.h>
17 #include <linux/delay.h>
18 #include <linux/pci.h>
19 #include <linux/fb.h>
20
21 #include <asm/io.h>
22 #include "savagefb.h"
23
24 #define SAVAGE_DDC 0x50
25
26 #define VGA_CR_IX 0x3d4
27 #define VGA_CR_DATA 0x3d5
28
29 #define CR_SERIAL1 0xa0 /* I2C serial communications interface */
30 #define MM_SERIAL1 0xff20
31 #define CR_SERIAL2 0xb1 /* DDC2 monitor communications interface */
32
33 /* based on vt8365 documentation */
34 #define PROSAVAGE_I2C_ENAB 0x10
35 #define PROSAVAGE_I2C_SCL_OUT 0x01
36 #define PROSAVAGE_I2C_SDA_OUT 0x02
37 #define PROSAVAGE_I2C_SCL_IN 0x04
38 #define PROSAVAGE_I2C_SDA_IN 0x08
39
40 #define SAVAGE4_I2C_ENAB 0x00000020
41 #define SAVAGE4_I2C_SCL_OUT 0x00000001
42 #define SAVAGE4_I2C_SDA_OUT 0x00000002
43 #define SAVAGE4_I2C_SCL_IN 0x00000008
44 #define SAVAGE4_I2C_SDA_IN 0x00000010
45
46 #define SET_CR_IX(base, val) writeb((val), base + 0x8000 + VGA_CR_IX)
47 #define SET_CR_DATA(base, val) writeb((val), base + 0x8000 + VGA_CR_DATA)
48 #define GET_CR_DATA(base) readb(base + 0x8000 + VGA_CR_DATA)
49
50 static void savage4_gpio_setscl(void *data, int val)
51 {
52 struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
53 unsigned int r;
54
55 r = readl(chan->ioaddr + chan->reg);
56 if(val)
57 r |= SAVAGE4_I2C_SCL_OUT;
58 else
59 r &= ~SAVAGE4_I2C_SCL_OUT;
60 writel(r, chan->ioaddr + chan->reg);
61 readl(chan->ioaddr + chan->reg); /* flush posted write */
62 }
63
64 static void savage4_gpio_setsda(void *data, int val)
65 {
66 struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
67
68 unsigned int r;
69 r = readl(chan->ioaddr + chan->reg);
70 if(val)
71 r |= SAVAGE4_I2C_SDA_OUT;
72 else
73 r &= ~SAVAGE4_I2C_SDA_OUT;
74 writel(r, chan->ioaddr + chan->reg);
75 readl(chan->ioaddr + chan->reg); /* flush posted write */
76 }
77
78 static int savage4_gpio_getscl(void *data)
79 {
80 struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
81
82 return (0 != (readl(chan->ioaddr + chan->reg) & SAVAGE4_I2C_SCL_IN));
83 }
84
85 static int savage4_gpio_getsda(void *data)
86 {
87 struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
88
89 return (0 != (readl(chan->ioaddr + chan->reg) & SAVAGE4_I2C_SDA_IN));
90 }
91
92 static void prosavage_gpio_setscl(void* data, int val)
93 {
94 struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
95 u32 r;
96
97 SET_CR_IX(chan->ioaddr, chan->reg);
98 r = GET_CR_DATA(chan->ioaddr);
99 r |= PROSAVAGE_I2C_ENAB;
100 if (val) {
101 r |= PROSAVAGE_I2C_SCL_OUT;
102 } else {
103 r &= ~PROSAVAGE_I2C_SCL_OUT;
104 }
105 SET_CR_DATA(chan->ioaddr, r);
106 }
107
108 static void prosavage_gpio_setsda(void* data, int val)
109 {
110 struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
111 unsigned int r;
112
113 SET_CR_IX(chan->ioaddr, chan->reg);
114 r = GET_CR_DATA(chan->ioaddr);
115 r |= PROSAVAGE_I2C_ENAB;
116 if (val) {
117 r |= PROSAVAGE_I2C_SDA_OUT;
118 } else {
119 r &= ~PROSAVAGE_I2C_SDA_OUT;
120 }
121 SET_CR_DATA(chan->ioaddr, r);
122 }
123
124 static int prosavage_gpio_getscl(void* data)
125 {
126 struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
127
128 SET_CR_IX(chan->ioaddr, chan->reg);
129 return (0 != (GET_CR_DATA(chan->ioaddr) & PROSAVAGE_I2C_SCL_IN));
130 }
131
132 static int prosavage_gpio_getsda(void* data)
133 {
134 struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
135
136 SET_CR_IX(chan->ioaddr, chan->reg);
137 return (0 != (GET_CR_DATA(chan->ioaddr) & PROSAVAGE_I2C_SDA_IN));
138 }
139
140 static int savage_setup_i2c_bus(struct savagefb_i2c_chan *chan,
141 const char *name)
142 {
143 int (*add_bus)(struct i2c_adapter *) = symbol_get(i2c_bit_add_bus);
144 int rc = 0;
145
146 if (add_bus && chan->par) {
147 strcpy(chan->adapter.name, name);
148 chan->adapter.owner = THIS_MODULE;
149 chan->adapter.id = I2C_HW_B_SAVAGE;
150 chan->adapter.algo_data = &chan->algo;
151 chan->adapter.dev.parent = &chan->par->pcidev->dev;
152 chan->algo.udelay = 40;
153 chan->algo.mdelay = 5;
154 chan->algo.timeout = 20;
155 chan->algo.data = chan;
156
157 i2c_set_adapdata(&chan->adapter, chan);
158
159 /* Raise SCL and SDA */
160 chan->algo.setsda(chan, 1);
161 chan->algo.setscl(chan, 1);
162 udelay(20);
163
164 rc = add_bus(&chan->adapter);
165
166 if (rc == 0)
167 dev_dbg(&chan->par->pcidev->dev,
168 "I2C bus %s registered.\n", name);
169 else
170 dev_warn(&chan->par->pcidev->dev,
171 "Failed to register I2C bus %s.\n", name);
172
173 symbol_put(i2c_bit_add_bus);
174 } else
175 chan->par = NULL;
176
177 return rc;
178 }
179
180 void savagefb_create_i2c_busses(struct fb_info *info)
181 {
182 struct savagefb_par *par = (struct savagefb_par *)info->par;
183 par->chan.par = par;
184
185 switch(info->fix.accel) {
186 case FB_ACCEL_PROSAVAGE_DDRK:
187 case FB_ACCEL_PROSAVAGE_PM:
188 par->chan.reg = CR_SERIAL2;
189 par->chan.ioaddr = par->mmio.vbase;
190 par->chan.algo.setsda = prosavage_gpio_setsda;
191 par->chan.algo.setscl = prosavage_gpio_setscl;
192 par->chan.algo.getsda = prosavage_gpio_getsda;
193 par->chan.algo.getscl = prosavage_gpio_getscl;
194 break;
195 case FB_ACCEL_SAVAGE4:
196 par->chan.reg = 0xff20;
197 par->chan.ioaddr = par->mmio.vbase;
198 par->chan.algo.setsda = savage4_gpio_setsda;
199 par->chan.algo.setscl = savage4_gpio_setscl;
200 par->chan.algo.getsda = savage4_gpio_getsda;
201 par->chan.algo.getscl = savage4_gpio_getscl;
202 break;
203 default:
204 par->chan.par = NULL;
205 }
206
207 savage_setup_i2c_bus(&par->chan, "SAVAGE DDC2");
208 }
209
210 void savagefb_delete_i2c_busses(struct fb_info *info)
211 {
212 struct savagefb_par *par = (struct savagefb_par *)info->par;
213 int (*del_bus)(struct i2c_adapter *) =
214 symbol_get(i2c_bit_del_bus);
215
216 if (del_bus && par->chan.par) {
217 del_bus(&par->chan.adapter);
218 symbol_put(i2c_bit_del_bus);
219 }
220
221 par->chan.par = NULL;
222 }
223
224 static u8 *savage_do_probe_i2c_edid(struct savagefb_i2c_chan *chan)
225 {
226 u8 start = 0x0;
227 int (*transfer)(struct i2c_adapter *, struct i2c_msg *, int) =
228 symbol_get(i2c_transfer);
229 struct i2c_msg msgs[] = {
230 {
231 .addr = SAVAGE_DDC,
232 .len = 1,
233 .buf = &start,
234 }, {
235 .addr = SAVAGE_DDC,
236 .flags = I2C_M_RD,
237 .len = EDID_LENGTH,
238 },
239 };
240 u8 *buf = NULL;
241
242 if (transfer && chan->par) {
243 buf = kmalloc(EDID_LENGTH, GFP_KERNEL);
244
245 if (buf) {
246 msgs[1].buf = buf;
247
248 if (transfer(&chan->adapter, msgs, 2) != 2) {
249 dev_dbg(&chan->par->pcidev->dev,
250 "Unable to read EDID block.\n");
251 kfree(buf);
252 buf = NULL;
253 }
254 }
255
256 symbol_put(i2c_transfer);
257 }
258
259 return buf;
260 }
261
262 int savagefb_probe_i2c_connector(struct fb_info *info, u8 **out_edid)
263 {
264 struct savagefb_par *par = info->par;
265 u8 *edid = NULL;
266 int i;
267
268 for (i = 0; i < 3; i++) {
269 /* Do the real work */
270 edid = savage_do_probe_i2c_edid(&par->chan);
271 if (edid)
272 break;
273 }
274
275 if (!edid) {
276 /* try to get from firmware */
277 const u8 *e = fb_firmware_edid(info->device);
278
279 if (e) {
280 edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
281 if (edid)
282 memcpy(edid, e, EDID_LENGTH);
283 }
284 }
285
286 if (out_edid)
287 *out_edid = edid;
288
289 return (edid) ? 0 : 1;
290 }
291
292 MODULE_LICENSE("GPL");
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