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