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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
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
34
35#ifdef DEBUG
36#define DPRINTK(fmt, args...) printk(fmt,## args)
37#else
38#define DPRINTK(fmt, args...)
39#endif
40
41static 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);
50}
51
52static 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);
61}
62
63static 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
74static 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
85static 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->algo.setsda = i810i2c_setsda;
94 chan->algo.setscl = i810i2c_setscl;
95 chan->algo.getsda = i810i2c_getsda;
96 chan->algo.getscl = i810i2c_getscl;
97 chan->algo.udelay = 10;
98 chan->algo.timeout = (HZ/2);
99 chan->algo.data = chan;
100
101 i2c_set_adapdata(&chan->adapter, chan);
102
103
104 chan->algo.setsda(chan, 1);
105 chan->algo.setscl(chan, 1);
106 udelay(20);
107
108 rc = i2c_bit_add_bus(&chan->adapter);
109
110 if (rc == 0)
111 dev_dbg(&chan->par->dev->dev, "I2C bus %s registered.\n",name);
112 else {
113 dev_warn(&chan->par->dev->dev, "Failed to register I2C bus "
114 "%s.\n", name);
115 chan->par = NULL;
116 }
117
118 return rc;
119}
120
121void i810_create_i2c_busses(struct i810fb_par *par)
122{
123 par->chan[0].par = par;
124 par->chan[1].par = par;
125 par->chan[2].par = par;
126
127 par->chan[0].ddc_base = GPIOA;
128 i810_setup_i2c_bus(&par->chan[0], "I810-DDC");
129 par->chan[1].ddc_base = GPIOB;
130 i810_setup_i2c_bus(&par->chan[1], "I810-I2C");
131 par->chan[2].ddc_base = GPIOC;
132 i810_setup_i2c_bus(&par->chan[2], "I810-GPIOC");
133}
134
135void i810_delete_i2c_busses(struct i810fb_par *par)
136{
137 if (par->chan[0].par)
138 i2c_del_adapter(&par->chan[0].adapter);
139 par->chan[0].par = NULL;
140
141 if (par->chan[1].par)
142 i2c_del_adapter(&par->chan[1].adapter);
143 par->chan[1].par = NULL;
144
145 if (par->chan[2].par)
146 i2c_del_adapter(&par->chan[2].adapter);
147 par->chan[2].par = NULL;
148}
149
150int i810_probe_i2c_connector(struct fb_info *info, u8 **out_edid, int conn)
151{
152 struct i810fb_par *par = info->par;
153 u8 *edid = NULL;
154
155 DPRINTK("i810-i2c: Probe DDC%i Bus\n", conn+1);
156 if (conn < par->ddc_num) {
157 edid = fb_ddc_read(&par->chan[conn].adapter);
158 } else {
159 const u8 *e = fb_firmware_edid(info->device);
160
161 if (e != NULL) {
162 DPRINTK("i810-i2c: Getting EDID from BIOS\n");
163 edid = kmemdup(e, EDID_LENGTH, GFP_KERNEL);
164 }
165 }
166
167 *out_edid = edid;
168
169 return (edid) ? 0 : 1;
170}
171
