aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/video/aty/radeon_i2c.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/video/aty/radeon_i2c.c')
-rw-r--r--drivers/video/aty/radeon_i2c.c265
1 files changed, 265 insertions, 0 deletions
diff --git a/drivers/video/aty/radeon_i2c.c b/drivers/video/aty/radeon_i2c.c
new file mode 100644
index 000000000000..762244164c81
--- /dev/null
+++ b/drivers/video/aty/radeon_i2c.c
@@ -0,0 +1,265 @@
1#include <linux/config.h>
2#include <linux/module.h>
3#include <linux/kernel.h>
4#include <linux/sched.h>
5#include <linux/delay.h>
6#include <linux/pci.h>
7#include <linux/fb.h>
8
9
10#include <linux/i2c.h>
11#include <linux/i2c-id.h>
12#include <linux/i2c-algo-bit.h>
13
14#include <asm/io.h>
15
16#include <video/radeon.h>
17#include "radeonfb.h"
18#include "../edid.h"
19
20#define RADEON_DDC 0x50
21
22static void radeon_gpio_setscl(void* data, int state)
23{
24 struct radeon_i2c_chan *chan = data;
25 struct radeonfb_info *rinfo = chan->rinfo;
26 u32 val;
27
28 val = INREG(chan->ddc_reg) & ~(VGA_DDC_CLK_OUT_EN);
29 if (!state)
30 val |= VGA_DDC_CLK_OUT_EN;
31
32 OUTREG(chan->ddc_reg, val);
33 (void)INREG(chan->ddc_reg);
34}
35
36static void radeon_gpio_setsda(void* data, int state)
37{
38 struct radeon_i2c_chan *chan = data;
39 struct radeonfb_info *rinfo = chan->rinfo;
40 u32 val;
41
42 val = INREG(chan->ddc_reg) & ~(VGA_DDC_DATA_OUT_EN);
43 if (!state)
44 val |= VGA_DDC_DATA_OUT_EN;
45
46 OUTREG(chan->ddc_reg, val);
47 (void)INREG(chan->ddc_reg);
48}
49
50static int radeon_gpio_getscl(void* data)
51{
52 struct radeon_i2c_chan *chan = data;
53 struct radeonfb_info *rinfo = chan->rinfo;
54 u32 val;
55
56 val = INREG(chan->ddc_reg);
57
58 return (val & VGA_DDC_CLK_INPUT) ? 1 : 0;
59}
60
61static int radeon_gpio_getsda(void* data)
62{
63 struct radeon_i2c_chan *chan = data;
64 struct radeonfb_info *rinfo = chan->rinfo;
65 u32 val;
66
67 val = INREG(chan->ddc_reg);
68
69 return (val & VGA_DDC_DATA_INPUT) ? 1 : 0;
70}
71
72static int radeon_setup_i2c_bus(struct radeon_i2c_chan *chan, const char *name)
73{
74 int rc;
75
76 strcpy(chan->adapter.name, name);
77 chan->adapter.owner = THIS_MODULE;
78 chan->adapter.id = I2C_ALGO_ATI;
79 chan->adapter.algo_data = &chan->algo;
80 chan->adapter.dev.parent = &chan->rinfo->pdev->dev;
81 chan->algo.setsda = radeon_gpio_setsda;
82 chan->algo.setscl = radeon_gpio_setscl;
83 chan->algo.getsda = radeon_gpio_getsda;
84 chan->algo.getscl = radeon_gpio_getscl;
85 chan->algo.udelay = 40;
86 chan->algo.timeout = 20;
87 chan->algo.data = chan;
88
89 i2c_set_adapdata(&chan->adapter, chan);
90
91 /* Raise SCL and SDA */
92 radeon_gpio_setsda(chan, 1);
93 radeon_gpio_setscl(chan, 1);
94 udelay(20);
95
96 rc = i2c_bit_add_bus(&chan->adapter);
97 if (rc == 0)
98 dev_dbg(&chan->rinfo->pdev->dev, "I2C bus %s registered.\n", name);
99 else
100 dev_warn(&chan->rinfo->pdev->dev, "Failed to register I2C bus %s.\n", name);
101 return rc;
102}
103
104void radeon_create_i2c_busses(struct radeonfb_info *rinfo)
105{
106 rinfo->i2c[0].rinfo = rinfo;
107 rinfo->i2c[0].ddc_reg = GPIO_MONID;
108 radeon_setup_i2c_bus(&rinfo->i2c[0], "monid");
109
110 rinfo->i2c[1].rinfo = rinfo;
111 rinfo->i2c[1].ddc_reg = GPIO_DVI_DDC;
112 radeon_setup_i2c_bus(&rinfo->i2c[1], "dvi");
113
114 rinfo->i2c[2].rinfo = rinfo;
115 rinfo->i2c[2].ddc_reg = GPIO_VGA_DDC;
116 radeon_setup_i2c_bus(&rinfo->i2c[2], "vga");
117
118 rinfo->i2c[3].rinfo = rinfo;
119 rinfo->i2c[3].ddc_reg = GPIO_CRT2_DDC;
120 radeon_setup_i2c_bus(&rinfo->i2c[3], "crt2");
121}
122
123void radeon_delete_i2c_busses(struct radeonfb_info *rinfo)
124{
125 if (rinfo->i2c[0].rinfo)
126 i2c_bit_del_bus(&rinfo->i2c[0].adapter);
127 rinfo->i2c[0].rinfo = NULL;
128
129 if (rinfo->i2c[1].rinfo)
130 i2c_bit_del_bus(&rinfo->i2c[1].adapter);
131 rinfo->i2c[1].rinfo = NULL;
132
133 if (rinfo->i2c[2].rinfo)
134 i2c_bit_del_bus(&rinfo->i2c[2].adapter);
135 rinfo->i2c[2].rinfo = NULL;
136
137 if (rinfo->i2c[3].rinfo)
138 i2c_bit_del_bus(&rinfo->i2c[3].adapter);
139 rinfo->i2c[3].rinfo = NULL;
140}
141
142
143static u8 *radeon_do_probe_i2c_edid(struct radeon_i2c_chan *chan)
144{
145 u8 start = 0x0;
146 struct i2c_msg msgs[] = {
147 {
148 .addr = RADEON_DDC,
149 .len = 1,
150 .buf = &start,
151 }, {
152 .addr = RADEON_DDC,
153 .flags = I2C_M_RD,
154 .len = EDID_LENGTH,
155 },
156 };
157 u8 *buf;
158
159 buf = kmalloc(EDID_LENGTH, GFP_KERNEL);
160 if (!buf) {
161 dev_warn(&chan->rinfo->pdev->dev, "Out of memory!\n");
162 return NULL;
163 }
164 msgs[1].buf = buf;
165
166 if (i2c_transfer(&chan->adapter, msgs, 2) == 2)
167 return buf;
168 dev_dbg(&chan->rinfo->pdev->dev, "Unable to read EDID block.\n");
169 kfree(buf);
170 return NULL;
171}
172
173
174int radeon_probe_i2c_connector(struct radeonfb_info *rinfo, int conn, u8 **out_edid)
175{
176 u32 reg = rinfo->i2c[conn-1].ddc_reg;
177 u8 *edid = NULL;
178 int i, j;
179
180 OUTREG(reg, INREG(reg) &
181 ~(VGA_DDC_DATA_OUTPUT | VGA_DDC_CLK_OUTPUT));
182
183 OUTREG(reg, INREG(reg) & ~(VGA_DDC_CLK_OUT_EN));
184 (void)INREG(reg);
185
186 for (i = 0; i < 3; i++) {
187 /* For some old monitors we need the
188 * following process to initialize/stop DDC
189 */
190 OUTREG(reg, INREG(reg) & ~(VGA_DDC_DATA_OUT_EN));
191 (void)INREG(reg);
192 msleep(13);
193
194 OUTREG(reg, INREG(reg) & ~(VGA_DDC_CLK_OUT_EN));
195 (void)INREG(reg);
196 for (j = 0; j < 5; j++) {
197 msleep(10);
198 if (INREG(reg) & VGA_DDC_CLK_INPUT)
199 break;
200 }
201 if (j == 5)
202 continue;
203
204 OUTREG(reg, INREG(reg) | VGA_DDC_DATA_OUT_EN);
205 (void)INREG(reg);
206 msleep(15);
207 OUTREG(reg, INREG(reg) | VGA_DDC_CLK_OUT_EN);
208 (void)INREG(reg);
209 msleep(15);
210 OUTREG(reg, INREG(reg) & ~(VGA_DDC_DATA_OUT_EN));
211 (void)INREG(reg);
212 msleep(15);
213
214 /* Do the real work */
215 edid = radeon_do_probe_i2c_edid(&rinfo->i2c[conn-1]);
216
217 OUTREG(reg, INREG(reg) |
218 (VGA_DDC_DATA_OUT_EN | VGA_DDC_CLK_OUT_EN));
219 (void)INREG(reg);
220 msleep(15);
221
222 OUTREG(reg, INREG(reg) & ~(VGA_DDC_CLK_OUT_EN));
223 (void)INREG(reg);
224 for (j = 0; j < 10; j++) {
225 msleep(10);
226 if (INREG(reg) & VGA_DDC_CLK_INPUT)
227 break;
228 }
229
230 OUTREG(reg, INREG(reg) & ~(VGA_DDC_DATA_OUT_EN));
231 (void)INREG(reg);
232 msleep(15);
233 OUTREG(reg, INREG(reg) |
234 (VGA_DDC_DATA_OUT_EN | VGA_DDC_CLK_OUT_EN));
235 (void)INREG(reg);
236 if (edid)
237 break;
238 }
239 /* Release the DDC lines when done or the Apple Cinema HD display
240 * will switch off
241 */
242 OUTREG(reg, INREG(reg) & ~(VGA_DDC_CLK_OUT_EN | VGA_DDC_DATA_OUT_EN));
243 (void)INREG(reg);
244
245 if (out_edid)
246 *out_edid = edid;
247 if (!edid) {
248 RTRACE("radeonfb: I2C (port %d) ... not found\n", conn);
249 return MT_NONE;
250 }
251 if (edid[0x14] & 0x80) {
252 /* Fix detection using BIOS tables */
253 if (rinfo->is_mobility /*&& conn == ddc_dvi*/ &&
254 (INREG(LVDS_GEN_CNTL) & LVDS_ON)) {
255 RTRACE("radeonfb: I2C (port %d) ... found LVDS panel\n", conn);
256 return MT_LCD;
257 } else {
258 RTRACE("radeonfb: I2C (port %d) ... found TMDS panel\n", conn);
259 return MT_DFP;
260 }
261 }
262 RTRACE("radeonfb: I2C (port %d) ... found CRT display\n", conn);
263 return MT_CRT;
264}
265
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-18 13:00:59 -0500