1 /*-*- linux-c -*-
2 * linux/drivers/video/i810-i2c.c -- Intel 810/815 I2C support
3 *
4 * Copyright (C) 2004 Antonino Daplas<adaplas@pol.net>
5 * All Rights Reserved
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file COPYING in the main directory of this archive for
9 * more details.
10 */
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/delay.h>
14 #include <linux/pci.h>
15 #include <linux/fb.h>
16 #include "i810.h"
17 #include "i810_regs.h"
18 #include "i810_main.h"
19 #include "../edid.h"
20
21 /* bit locations in the registers */
22 #define SCL_DIR_MASK 0x0001
23 #define SCL_DIR 0x0002
24 #define SCL_VAL_MASK 0x0004
25 #define SCL_VAL_OUT 0x0008
26 #define SCL_VAL_IN 0x0010
27 #define SDA_DIR_MASK 0x0100
28 #define SDA_DIR 0x0200
29 #define SDA_VAL_MASK 0x0400
30 #define SDA_VAL_OUT 0x0800
31 #define SDA_VAL_IN 0x1000
32
33 #define DEBUG /* define this for verbose EDID parsing output */
34
35 #ifdef DEBUG
36 #define DPRINTK(fmt, args...) printk(fmt,## args)
37 #else
38 #define DPRINTK(fmt, args...)
39 #endif
40
41 static void i810i2c_setscl(void *data, int state)
42 {
43 struct i810fb_i2c_chan *chan = data;
44 struct i810fb_par *par = chan->par;
45 u8 __iomem *mmio = par->mmio_start_virtual;
46
47 i810_writel(mmio, chan->ddc_base, (state ? SCL_VAL_OUT : 0) | SCL_DIR |
48 SCL_DIR_MASK | SCL_VAL_MASK);
49 i810_readl(mmio, chan->ddc_base); /* flush posted write */
50 }
51
52 static void i810i2c_setsda(void *data, int state)
53 {
54 struct i810fb_i2c_chan *chan = data;
55 struct i810fb_par *par = chan->par;
56 u8 __iomem *mmio = par->mmio_start_virtual;
57
58 i810_writel(mmio, chan->ddc_base, (state ? SDA_VAL_OUT : 0) | SDA_DIR |
59 SDA_DIR_MASK | SDA_VAL_MASK);
60 i810_readl(mmio, chan->ddc_base); /* flush posted write */
61 }
62
63 static int i810i2c_getscl(void *data)
64 {
65 struct i810fb_i2c_chan *chan = data;
66 struct i810fb_par *par = chan->par;
67 u8 __iomem *mmio = par->mmio_start_virtual;
68
69 i810_writel(mmio, chan->ddc_base, SCL_DIR_MASK);
70 i810_writel(mmio, chan->ddc_base, 0);
71 return ((i810_readl(mmio, chan->ddc_base) & SCL_VAL_IN) != 0);
72 }
73
74 static int i810i2c_getsda(void *data)
75 {
76 struct i810fb_i2c_chan *chan = data;
77 struct i810fb_par *par = chan->par;
78 u8 __iomem *mmio = par->mmio_start_virtual;
79
80 i810_writel(mmio, chan->ddc_base, SDA_DIR_MASK);
81 i810_writel(mmio, chan->ddc_base, 0);
82 return ((i810_readl(mmio, chan->ddc_base) & SDA_VAL_IN) != 0);
83 }
84
85 static int i810_setup_i2c_bus(struct i810fb_i2c_chan *chan, const char *name)
86 {
87 int rc;
88
89 strcpy(chan->adapter.name, name);
90 chan->adapter.owner = THIS_MODULE;
91 chan->adapter.algo_data = &chan->algo;
92 chan->adapter.dev.parent = &chan->par->dev->dev;
93 chan->adapter.id = I2C_HW_B_I810;
94 chan->algo.setsda = i810i2c_setsda;
95 chan->algo.setscl = i810i2c_setscl;
96 chan->algo.getsda = i810i2c_getsda;
97 chan->algo.getscl = i810i2c_getscl;
98 chan->algo.udelay = 10;
99 chan->algo.timeout = (HZ/2);
100 chan->algo.data = chan;
101
102 i2c_set_adapdata(&chan->adapter, chan);
103
104 /* Raise SCL and SDA */
105 chan->algo.setsda(chan, 1);
106 chan->algo.setscl(chan, 1);
107 udelay(20);
108
109 rc = i2c_bit_add_bus(&chan->adapter);
110
111 if (rc == 0)
112 dev_dbg(&chan->par->dev->dev, "I2C bus %s registered.\n",name);
113 else {
114 dev_warn(&chan->par->dev->dev, "Failed to register I2C bus "
115 "%s.\n", name);
116 chan->par = NULL;
117 }
118
119 return rc;
120 }
121
122 void i810_create_i2c_busses(struct i810fb_par *par)
123 {
124 par->chan[0].par = par;
125 par->chan[1].par = par;
126 par->chan[2].par = par;
127
128 par->chan[0].ddc_base = GPIOA;
129 i810_setup_i2c_bus(&par->chan[0], "I810-DDC");
130 par->chan[1].ddc_base = GPIOB;
131 i810_setup_i2c_bus(&par->chan[1], "I810-I2C");
132 par->chan[2].ddc_base = GPIOC;
133 i810_setup_i2c_bus(&par->chan[2], "I810-GPIOC");
134 }
135
136 void i810_delete_i2c_busses(struct i810fb_par *par)
137 {
138 if (par->chan[0].par)
139 i2c_del_adapter(&par->chan[0].adapter);
140 par->chan[0].par = NULL;
141
142 if (par->chan[1].par)
143 i2c_del_adapter(&par->chan[1].adapter);
144 par->chan[1].par = NULL;
145
146 if (par->chan[2].par)
147 i2c_del_adapter(&par->chan[2].adapter);
148 par->chan[2].par = NULL;
149 }
150
151 int i810_probe_i2c_connector(struct fb_info *info, u8 **out_edid, int conn)
152 {
153 struct i810fb_par *par = info->par;
154 u8 *edid = NULL;
155
156 DPRINTK("i810-i2c: Probe DDC%i Bus\n", conn+1);
157 if (conn < par->ddc_num) {
158 edid = fb_ddc_read(&par->chan[conn].adapter);
159 } else {
160 const u8 *e = fb_firmware_edid(info->device);
161
162 if (e != NULL) {
163 DPRINTK("i810-i2c: Getting EDID from BIOS\n");
164 edid = kmemdup(e, EDID_LENGTH, GFP_KERNEL);
165 }
166 }
167
168 *out_edid = edid;
169
170 return (edid) ? 0 : 1;
171 }
172
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