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[linux-2.6] / drivers / video / savage / savagefb-i2c.c
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/module.h>
14 #include <linux/kernel.h>
15 #include <linux/sched.h>
16 #include <linux/delay.h>
17 #include <linux/pci.h>
18 #include <linux/fb.h>
19
20 #include <asm/io.h>
21 #include "savagefb.h"
22
23 #define SAVAGE_DDC      0x50
24
25 #define VGA_CR_IX       0x3d4
26 #define VGA_CR_DATA     0x3d5
27
28 #define CR_SERIAL1      0xa0    /* I2C serial communications interface */
29 #define MM_SERIAL1      0xff20
30 #define CR_SERIAL2      0xb1    /* DDC2 monitor communications interface */
31
32 /* based on vt8365 documentation */
33 #define PROSAVAGE_I2C_ENAB      0x10
34 #define PROSAVAGE_I2C_SCL_OUT   0x01
35 #define PROSAVAGE_I2C_SDA_OUT   0x02
36 #define PROSAVAGE_I2C_SCL_IN    0x04
37 #define PROSAVAGE_I2C_SDA_IN    0x08
38
39 #define SAVAGE4_I2C_ENAB        0x00000020
40 #define SAVAGE4_I2C_SCL_OUT     0x00000001
41 #define SAVAGE4_I2C_SDA_OUT     0x00000002
42 #define SAVAGE4_I2C_SCL_IN      0x00000008
43 #define SAVAGE4_I2C_SDA_IN      0x00000010
44
45 #define SET_CR_IX(base, val)    writeb((val), base + 0x8000 + VGA_CR_IX)
46 #define SET_CR_DATA(base, val)  writeb((val), base + 0x8000 + VGA_CR_DATA)
47 #define GET_CR_DATA(base)       readb(base + 0x8000 + VGA_CR_DATA)
48
49 static void savage4_gpio_setscl(void *data, int val)
50 {
51         struct savagefb_i2c_chan *chan = data;
52         unsigned int r;
53
54         r = readl(chan->ioaddr + chan->reg);
55         if(val)
56                 r |= SAVAGE4_I2C_SCL_OUT;
57         else
58                 r &= ~SAVAGE4_I2C_SCL_OUT;
59         writel(r, chan->ioaddr + chan->reg);
60         readl(chan->ioaddr + chan->reg);        /* flush posted write */
61 }
62
63 static void savage4_gpio_setsda(void *data, int val)
64 {
65         struct savagefb_i2c_chan *chan = data;
66
67         unsigned int r;
68         r = readl(chan->ioaddr + chan->reg);
69         if(val)
70                 r |= SAVAGE4_I2C_SDA_OUT;
71         else
72                 r &= ~SAVAGE4_I2C_SDA_OUT;
73         writel(r, chan->ioaddr + chan->reg);
74         readl(chan->ioaddr + chan->reg);        /* flush posted write */
75 }
76
77 static int savage4_gpio_getscl(void *data)
78 {
79         struct savagefb_i2c_chan *chan = data;
80
81         return (0 != (readl(chan->ioaddr + chan->reg) & SAVAGE4_I2C_SCL_IN));
82 }
83
84 static int savage4_gpio_getsda(void *data)
85 {
86         struct savagefb_i2c_chan *chan = data;
87
88         return (0 != (readl(chan->ioaddr + chan->reg) & SAVAGE4_I2C_SDA_IN));
89 }
90
91 static void prosavage_gpio_setscl(void* data, int val)
92 {
93         struct savagefb_i2c_chan *chan = data;
94         u32                       r;
95
96         SET_CR_IX(chan->ioaddr, chan->reg);
97         r = GET_CR_DATA(chan->ioaddr);
98         r |= PROSAVAGE_I2C_ENAB;
99         if (val) {
100                 r |= PROSAVAGE_I2C_SCL_OUT;
101         } else {
102                 r &= ~PROSAVAGE_I2C_SCL_OUT;
103         }
104         SET_CR_DATA(chan->ioaddr, r);
105 }
106
107 static void prosavage_gpio_setsda(void* data, int val)
108 {
109         struct savagefb_i2c_chan *chan = data;
110         unsigned int r;
111
112         SET_CR_IX(chan->ioaddr, chan->reg);
113         r = GET_CR_DATA(chan->ioaddr);
114         r |= PROSAVAGE_I2C_ENAB;
115         if (val) {
116                 r |= PROSAVAGE_I2C_SDA_OUT;
117         } else {
118                 r &= ~PROSAVAGE_I2C_SDA_OUT;
119         }
120         SET_CR_DATA(chan->ioaddr, r);
121 }
122
123 static int prosavage_gpio_getscl(void* data)
124 {
125         struct savagefb_i2c_chan *chan = data;
126
127         SET_CR_IX(chan->ioaddr, chan->reg);
128         return (0 != (GET_CR_DATA(chan->ioaddr) & PROSAVAGE_I2C_SCL_IN));
129 }
130
131 static int prosavage_gpio_getsda(void* data)
132 {
133         struct savagefb_i2c_chan *chan = data;
134
135         SET_CR_IX(chan->ioaddr, chan->reg);
136         return (0 != (GET_CR_DATA(chan->ioaddr) & PROSAVAGE_I2C_SDA_IN));
137 }
138
139 static int savage_setup_i2c_bus(struct savagefb_i2c_chan *chan,
140                                 const char *name)
141 {
142         int rc = 0;
143
144         if (chan->par) {
145                 strcpy(chan->adapter.name, name);
146                 chan->adapter.owner             = THIS_MODULE;
147                 chan->adapter.id                = I2C_HW_B_SAVAGE;
148                 chan->adapter.algo_data         = &chan->algo;
149                 chan->adapter.dev.parent        = &chan->par->pcidev->dev;
150                 chan->algo.udelay               = 40;
151                 chan->algo.timeout              = 20;
152                 chan->algo.data                 = chan;
153
154                 i2c_set_adapdata(&chan->adapter, chan);
155
156                 /* Raise SCL and SDA */
157                 chan->algo.setsda(chan, 1);
158                 chan->algo.setscl(chan, 1);
159                 udelay(20);
160
161                 rc = i2c_bit_add_bus(&chan->adapter);
162
163                 if (rc == 0)
164                         dev_dbg(&chan->par->pcidev->dev,
165                                 "I2C bus %s registered.\n", name);
166                 else
167                         dev_warn(&chan->par->pcidev->dev,
168                                  "Failed to register I2C bus %s.\n", name);
169         } else
170                 chan->par = NULL;
171
172         return rc;
173 }
174
175 void savagefb_create_i2c_busses(struct fb_info *info)
176 {
177         struct savagefb_par *par = info->par;
178         par->chan.par   = par;
179
180         switch(info->fix.accel) {
181         case FB_ACCEL_PROSAVAGE_DDRK:
182         case FB_ACCEL_PROSAVAGE_PM:
183                 par->chan.reg         = CR_SERIAL2;
184                 par->chan.ioaddr      = par->mmio.vbase;
185                 par->chan.algo.setsda = prosavage_gpio_setsda;
186                 par->chan.algo.setscl = prosavage_gpio_setscl;
187                 par->chan.algo.getsda = prosavage_gpio_getsda;
188                 par->chan.algo.getscl = prosavage_gpio_getscl;
189                 break;
190         case FB_ACCEL_SAVAGE4:
191         case FB_ACCEL_SAVAGE2000:
192                 par->chan.reg         = 0xff20;
193                 par->chan.ioaddr      = par->mmio.vbase;
194                 par->chan.algo.setsda = savage4_gpio_setsda;
195                 par->chan.algo.setscl = savage4_gpio_setscl;
196                 par->chan.algo.getsda = savage4_gpio_getsda;
197                 par->chan.algo.getscl = savage4_gpio_getscl;
198                 break;
199         default:
200                 par->chan.par = NULL;
201         }
202
203         savage_setup_i2c_bus(&par->chan, "SAVAGE DDC2");
204 }
205
206 void savagefb_delete_i2c_busses(struct fb_info *info)
207 {
208         struct savagefb_par *par = info->par;
209
210         if (par->chan.par)
211                 i2c_del_adapter(&par->chan.adapter);
212
213         par->chan.par = NULL;
214 }
215
216 int savagefb_probe_i2c_connector(struct fb_info *info, u8 **out_edid)
217 {
218         struct savagefb_par *par = info->par;
219         u8 *edid;
220
221         if (par->chan.par)
222                 edid = fb_ddc_read(&par->chan.adapter);
223         else
224                 edid = NULL;
225
226         if (!edid) {
227                 /* try to get from firmware */
228                 const u8 *e = fb_firmware_edid(info->device);
229
230                 if (e)
231                         edid = kmemdup(e, EDID_LENGTH, GFP_KERNEL);
232         }
233
234         *out_edid = edid;
235
236         return (edid) ? 0 : 1;
237 }
238
239 MODULE_LICENSE("GPL");