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");
233
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