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/gfp.h> |
15 | #include <linux/pci.h> |
16 | #include <linux/fb.h> |
17 | #include "i810.h" |
18 | #include "i810_regs.h" |
19 | #include "i810_main.h" |
20 | #include "../edid.h" |
21 | |
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 | { |
44 | struct i810fb_i2c_chan *chan = data; |
45 | struct i810fb_par *par = chan->par; |
46 | u8 __iomem *mmio = par->mmio_start_virtual; |
47 | |
48 | if (state) |
49 | i810_writel(mmio, chan->ddc_base, SCL_DIR_MASK | SCL_VAL_MASK); |
50 | else |
51 | i810_writel(mmio, chan->ddc_base, SCL_DIR | SCL_DIR_MASK | SCL_VAL_MASK); |
52 | i810_readl(mmio, chan->ddc_base); /* flush posted write */ |
53 | } |
54 | |
55 | static void i810i2c_setsda(void *data, int state) |
56 | { |
57 | struct i810fb_i2c_chan *chan = data; |
58 | struct i810fb_par *par = chan->par; |
59 | u8 __iomem *mmio = par->mmio_start_virtual; |
60 | |
61 | if (state) |
62 | i810_writel(mmio, chan->ddc_base, SDA_DIR_MASK | SDA_VAL_MASK); |
63 | else |
64 | i810_writel(mmio, chan->ddc_base, SDA_DIR | SDA_DIR_MASK | SDA_VAL_MASK); |
65 | i810_readl(mmio, chan->ddc_base); /* flush posted write */ |
66 | } |
67 | |
68 | static int i810i2c_getscl(void *data) |
69 | { |
70 | struct i810fb_i2c_chan *chan = data; |
71 | struct i810fb_par *par = chan->par; |
72 | u8 __iomem *mmio = par->mmio_start_virtual; |
73 | |
74 | i810_writel(mmio, chan->ddc_base, SCL_DIR_MASK); |
75 | i810_writel(mmio, chan->ddc_base, 0); |
76 | return ((i810_readl(mmio, chan->ddc_base) & SCL_VAL_IN) != 0); |
77 | } |
78 | |
79 | static int i810i2c_getsda(void *data) |
80 | { |
81 | struct i810fb_i2c_chan *chan = data; |
82 | struct i810fb_par *par = chan->par; |
83 | u8 __iomem *mmio = par->mmio_start_virtual; |
84 | |
85 | i810_writel(mmio, chan->ddc_base, SDA_DIR_MASK); |
86 | i810_writel(mmio, chan->ddc_base, 0); |
87 | return ((i810_readl(mmio, chan->ddc_base) & SDA_VAL_IN) != 0); |
88 | } |
89 | |
90 | static int i810_setup_i2c_bus(struct i810fb_i2c_chan *chan, const char *name) |
91 | { |
92 | int rc; |
93 | |
94 | strcpy(p: chan->adapter.name, q: name); |
95 | chan->adapter.owner = THIS_MODULE; |
96 | chan->adapter.algo_data = &chan->algo; |
97 | chan->adapter.dev.parent = &chan->par->dev->dev; |
98 | chan->algo.setsda = i810i2c_setsda; |
99 | chan->algo.setscl = i810i2c_setscl; |
100 | chan->algo.getsda = i810i2c_getsda; |
101 | chan->algo.getscl = i810i2c_getscl; |
102 | chan->algo.udelay = 10; |
103 | chan->algo.timeout = (HZ/2); |
104 | chan->algo.data = chan; |
105 | |
106 | i2c_set_adapdata(adap: &chan->adapter, data: chan); |
107 | |
108 | /* Raise SCL and SDA */ |
109 | chan->algo.setsda(chan, 1); |
110 | chan->algo.setscl(chan, 1); |
111 | udelay(20); |
112 | |
113 | rc = i2c_bit_add_bus(&chan->adapter); |
114 | |
115 | if (rc == 0) |
116 | dev_dbg(&chan->par->dev->dev, "I2C bus %s registered.\n" ,name); |
117 | else { |
118 | dev_warn(&chan->par->dev->dev, "Failed to register I2C bus " |
119 | "%s.\n" , name); |
120 | chan->par = NULL; |
121 | } |
122 | |
123 | return rc; |
124 | } |
125 | |
126 | void i810_create_i2c_busses(struct i810fb_par *par) |
127 | { |
128 | par->chan[0].par = par; |
129 | par->chan[1].par = par; |
130 | par->chan[2].par = par; |
131 | |
132 | par->chan[0].ddc_base = GPIOA; |
133 | i810_setup_i2c_bus(chan: &par->chan[0], name: "I810-DDC" ); |
134 | par->chan[1].ddc_base = GPIOB; |
135 | i810_setup_i2c_bus(chan: &par->chan[1], name: "I810-I2C" ); |
136 | par->chan[2].ddc_base = GPIOC; |
137 | i810_setup_i2c_bus(chan: &par->chan[2], name: "I810-GPIOC" ); |
138 | } |
139 | |
140 | void i810_delete_i2c_busses(struct i810fb_par *par) |
141 | { |
142 | if (par->chan[0].par) |
143 | i2c_del_adapter(adap: &par->chan[0].adapter); |
144 | par->chan[0].par = NULL; |
145 | |
146 | if (par->chan[1].par) |
147 | i2c_del_adapter(adap: &par->chan[1].adapter); |
148 | par->chan[1].par = NULL; |
149 | |
150 | if (par->chan[2].par) |
151 | i2c_del_adapter(adap: &par->chan[2].adapter); |
152 | par->chan[2].par = NULL; |
153 | } |
154 | |
155 | int i810_probe_i2c_connector(struct fb_info *info, u8 **out_edid, int conn) |
156 | { |
157 | struct i810fb_par *par = info->par; |
158 | u8 *edid = NULL; |
159 | |
160 | DPRINTK("i810-i2c: Probe DDC%i Bus\n" , conn+1); |
161 | if (conn < par->ddc_num) { |
162 | edid = fb_ddc_read(adapter: &par->chan[conn].adapter); |
163 | } else { |
164 | const u8 *e = fb_firmware_edid(device: info->device); |
165 | |
166 | if (e != NULL) { |
167 | DPRINTK("i810-i2c: Getting EDID from BIOS\n" ); |
168 | edid = kmemdup(p: e, EDID_LENGTH, GFP_KERNEL); |
169 | } |
170 | } |
171 | |
172 | *out_edid = edid; |
173 | |
174 | return (edid) ? 0 : 1; |
175 | } |
176 | |