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74f6ae84 AD |
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 | */ | |
74f6ae84 AD |
11 | #include <linux/module.h> |
12 | #include <linux/kernel.h> | |
74f6ae84 | 13 | #include <linux/delay.h> |
5a0e3ad6 | 14 | #include <linux/gfp.h> |
74f6ae84 AD |
15 | #include <linux/pci.h> |
16 | #include <linux/fb.h> | |
17 | #include "i810.h" | |
18 | #include "i810_regs.h" | |
a0aa7d06 | 19 | #include "i810_main.h" |
74f6ae84 AD |
20 | #include "../edid.h" |
21 | ||
74f6ae84 AD |
22 | /* bit locations in the registers */ |
23 | #define SCL_DIR_MASK 0x0001 | |
24 | #define SCL_DIR 0x0002 | |
25 | #define SCL_VAL_MASK 0x0004 | |
26 | #define SCL_VAL_OUT 0x0008 | |
27 | #define SCL_VAL_IN 0x0010 | |
28 | #define SDA_DIR_MASK 0x0100 | |
29 | #define SDA_DIR 0x0200 | |
30 | #define SDA_VAL_MASK 0x0400 | |
31 | #define SDA_VAL_OUT 0x0800 | |
32 | #define SDA_VAL_IN 0x1000 | |
33 | ||
34 | #define DEBUG /* define this for verbose EDID parsing output */ | |
35 | ||
36 | #ifdef DEBUG | |
37 | #define DPRINTK(fmt, args...) printk(fmt,## args) | |
38 | #else | |
39 | #define DPRINTK(fmt, args...) | |
40 | #endif | |
41 | ||
42 | static void i810i2c_setscl(void *data, int state) | |
43 | { | |
c019c0ec | 44 | struct i810fb_i2c_chan *chan = data; |
74f6ae84 | 45 | struct i810fb_par *par = chan->par; |
be88ec74 | 46 | u8 __iomem *mmio = par->mmio_start_virtual; |
74f6ae84 | 47 | |
5fab851e | 48 | i810_writel(mmio, chan->ddc_base, (state ? SCL_VAL_OUT : 0) | SCL_DIR | |
74f6ae84 | 49 | SCL_DIR_MASK | SCL_VAL_MASK); |
5fab851e | 50 | i810_readl(mmio, chan->ddc_base); /* flush posted write */ |
74f6ae84 AD |
51 | } |
52 | ||
53 | static void i810i2c_setsda(void *data, int state) | |
54 | { | |
5fab851e | 55 | struct i810fb_i2c_chan *chan = data; |
74f6ae84 | 56 | struct i810fb_par *par = chan->par; |
be88ec74 | 57 | u8 __iomem *mmio = par->mmio_start_virtual; |
74f6ae84 | 58 | |
5fab851e | 59 | i810_writel(mmio, chan->ddc_base, (state ? SDA_VAL_OUT : 0) | SDA_DIR | |
74f6ae84 | 60 | SDA_DIR_MASK | SDA_VAL_MASK); |
5fab851e | 61 | i810_readl(mmio, chan->ddc_base); /* flush posted write */ |
74f6ae84 AD |
62 | } |
63 | ||
64 | static int i810i2c_getscl(void *data) | |
65 | { | |
5fab851e | 66 | struct i810fb_i2c_chan *chan = data; |
74f6ae84 | 67 | struct i810fb_par *par = chan->par; |
be88ec74 | 68 | u8 __iomem *mmio = par->mmio_start_virtual; |
74f6ae84 | 69 | |
5fab851e AD |
70 | i810_writel(mmio, chan->ddc_base, SCL_DIR_MASK); |
71 | i810_writel(mmio, chan->ddc_base, 0); | |
72 | return ((i810_readl(mmio, chan->ddc_base) & SCL_VAL_IN) != 0); | |
74f6ae84 AD |
73 | } |
74 | ||
75 | static int i810i2c_getsda(void *data) | |
76 | { | |
5fab851e | 77 | struct i810fb_i2c_chan *chan = data; |
74f6ae84 | 78 | struct i810fb_par *par = chan->par; |
be88ec74 | 79 | u8 __iomem *mmio = par->mmio_start_virtual; |
74f6ae84 | 80 | |
5fab851e AD |
81 | i810_writel(mmio, chan->ddc_base, SDA_DIR_MASK); |
82 | i810_writel(mmio, chan->ddc_base, 0); | |
83 | return ((i810_readl(mmio, chan->ddc_base) & SDA_VAL_IN) != 0); | |
74f6ae84 AD |
84 | } |
85 | ||
5fab851e | 86 | static int i810_setup_i2c_bus(struct i810fb_i2c_chan *chan, const char *name) |
74f6ae84 AD |
87 | { |
88 | int rc; | |
89 | ||
90 | strcpy(chan->adapter.name, name); | |
91 | chan->adapter.owner = THIS_MODULE; | |
92 | chan->adapter.algo_data = &chan->algo; | |
93 | chan->adapter.dev.parent = &chan->par->dev->dev; | |
5fab851e AD |
94 | chan->algo.setsda = i810i2c_setsda; |
95 | chan->algo.setscl = i810i2c_setscl; | |
96 | chan->algo.getsda = i810i2c_getsda; | |
97 | chan->algo.getscl = i810i2c_getscl; | |
74f6ae84 | 98 | chan->algo.udelay = 10; |
74f6ae84 AD |
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); | |
5fab851e | 110 | |
74f6ae84 AD |
111 | if (rc == 0) |
112 | dev_dbg(&chan->par->dev->dev, "I2C bus %s registered.\n",name); | |
5fab851e | 113 | else { |
74f6ae84 AD |
114 | dev_warn(&chan->par->dev->dev, "Failed to register I2C bus " |
115 | "%s.\n", name); | |
5fab851e AD |
116 | chan->par = NULL; |
117 | } | |
118 | ||
74f6ae84 AD |
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; | |
5fab851e AD |
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"); | |
74f6ae84 AD |
134 | } |
135 | ||
136 | void i810_delete_i2c_busses(struct i810fb_par *par) | |
137 | { | |
138 | if (par->chan[0].par) | |
3269711b | 139 | i2c_del_adapter(&par->chan[0].adapter); |
74f6ae84 | 140 | par->chan[0].par = NULL; |
5fab851e | 141 | |
74f6ae84 | 142 | if (par->chan[1].par) |
3269711b | 143 | i2c_del_adapter(&par->chan[1].adapter); |
74f6ae84 | 144 | par->chan[1].par = NULL; |
5fab851e AD |
145 | |
146 | if (par->chan[2].par) | |
3269711b | 147 | i2c_del_adapter(&par->chan[2].adapter); |
5fab851e | 148 | par->chan[2].par = NULL; |
74f6ae84 AD |
149 | } |
150 | ||
74f6ae84 AD |
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; | |
74f6ae84 | 155 | |
00d340b9 ML |
156 | DPRINTK("i810-i2c: Probe DDC%i Bus\n", conn+1); |
157 | if (conn < par->ddc_num) { | |
e80987f8 | 158 | edid = fb_ddc_read(&par->chan[conn].adapter); |
74f6ae84 | 159 | } else { |
5fab851e AD |
160 | const u8 *e = fb_firmware_edid(info->device); |
161 | ||
162 | if (e != NULL) { | |
163 | DPRINTK("i810-i2c: Getting EDID from BIOS\n"); | |
bfba7b37 | 164 | edid = kmemdup(e, EDID_LENGTH, GFP_KERNEL); |
5fab851e | 165 | } |
74f6ae84 AD |
166 | } |
167 | ||
7c518eb8 | 168 | *out_edid = edid; |
74f6ae84 AD |
169 | |
170 | return (edid) ? 0 : 1; | |
171 | } |