fbdev: intelfb: add support for the Intel Integrated Graphics Controller 965G/965GM
[linux-2.6.git] / drivers / video / intelfb / intelfb_i2c.c
1 /**************************************************************************
2
3  Copyright 2006 Dave Airlie <airlied@linux.ie>
4
5 All Rights Reserved.
6
7 Permission is hereby granted, free of charge, to any person obtaining a
8 copy of this software and associated documentation files (the "Software"),
9 to deal in the Software without restriction, including without limitation
10 on the rights to use, copy, modify, merge, publish, distribute, sub
11 license, and/or sell copies of the Software, and to permit persons to whom
12 the Software is furnished to do so, subject to the following conditions:
13
14 The above copyright notice and this permission notice (including the next
15 paragraph) shall be included in all copies or substantial portions of the
16 Software.
17
18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 THE COPYRIGHT HOLDERS AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 USE OR OTHER DEALINGS IN THE SOFTWARE.
25
26 **************************************************************************/
27
28 #include <linux/module.h>
29 #include <linux/kernel.h>
30 #include <linux/delay.h>
31 #include <linux/pci.h>
32 #include <linux/fb.h>
33
34 #include <linux/i2c.h>
35 #include <linux/i2c-id.h>
36 #include <linux/i2c-algo-bit.h>
37
38 #include <asm/io.h>
39
40 #include "intelfb.h"
41 #include "intelfbhw.h"
42
43 /* bit locations in the registers */
44 #define SCL_DIR_MASK            0x0001
45 #define SCL_DIR                 0x0002
46 #define SCL_VAL_MASK            0x0004
47 #define SCL_VAL_OUT             0x0008
48 #define SCL_VAL_IN              0x0010
49 #define SDA_DIR_MASK            0x0100
50 #define SDA_DIR                 0x0200
51 #define SDA_VAL_MASK            0x0400
52 #define SDA_VAL_OUT             0x0800
53 #define SDA_VAL_IN              0x1000
54
55 static void intelfb_gpio_setscl(void *data, int state)
56 {
57         struct intelfb_i2c_chan *chan = data;
58         struct intelfb_info *dinfo = chan->dinfo;
59         u32 val;
60
61         OUTREG(chan->reg, (state ? SCL_VAL_OUT : 0) |
62                SCL_DIR | SCL_DIR_MASK | SCL_VAL_MASK);
63         val = INREG(chan->reg);
64 }
65
66 static void intelfb_gpio_setsda(void *data, int state)
67 {
68         struct intelfb_i2c_chan *chan = data;
69         struct intelfb_info *dinfo = chan->dinfo;
70         u32 val;
71
72         OUTREG(chan->reg, (state ? SDA_VAL_OUT : 0) |
73                SDA_DIR | SDA_DIR_MASK | SDA_VAL_MASK);
74         val = INREG(chan->reg);
75 }
76
77 static int intelfb_gpio_getscl(void *data)
78 {
79         struct intelfb_i2c_chan *chan = data;
80         struct intelfb_info *dinfo = chan->dinfo;
81         u32 val;
82
83         OUTREG(chan->reg, SCL_DIR_MASK);
84         OUTREG(chan->reg, 0);
85         val = INREG(chan->reg);
86         return ((val & SCL_VAL_IN) != 0);
87 }
88
89 static int intelfb_gpio_getsda(void *data)
90 {
91         struct intelfb_i2c_chan *chan = data;
92         struct intelfb_info *dinfo = chan->dinfo;
93         u32 val;
94
95         OUTREG(chan->reg, SDA_DIR_MASK);
96         OUTREG(chan->reg, 0);
97         val = INREG(chan->reg);
98         return ((val & SDA_VAL_IN) != 0);
99 }
100
101 static int intelfb_setup_i2c_bus(struct intelfb_info *dinfo,
102                                  struct intelfb_i2c_chan *chan,
103                                  const u32 reg, const char *name)
104 {
105         int rc;
106
107         chan->dinfo                     = dinfo;
108         chan->reg                       = reg;
109         snprintf(chan->adapter.name, sizeof(chan->adapter.name),
110                  "intelfb %s", name);
111         chan->adapter.owner             = THIS_MODULE;
112         chan->adapter.id                = I2C_HW_B_INTELFB;
113         chan->adapter.algo_data         = &chan->algo;
114         chan->adapter.dev.parent        = &chan->dinfo->pdev->dev;
115         chan->algo.setsda               = intelfb_gpio_setsda;
116         chan->algo.setscl               = intelfb_gpio_setscl;
117         chan->algo.getsda               = intelfb_gpio_getsda;
118         chan->algo.getscl               = intelfb_gpio_getscl;
119         chan->algo.udelay               = 40;
120         chan->algo.timeout              = 20;
121         chan->algo.data                 = chan;
122
123         i2c_set_adapdata(&chan->adapter, chan);
124
125         /* Raise SCL and SDA */
126         intelfb_gpio_setsda(chan, 1);
127         intelfb_gpio_setscl(chan, 1);
128         udelay(20);
129
130         rc = i2c_bit_add_bus(&chan->adapter);
131         if (rc == 0)
132                 DBG_MSG("I2C bus %s registered.\n", name);
133         else
134                 WRN_MSG("Failed to register I2C bus %s.\n", name);
135         return rc;
136 }
137
138 void intelfb_create_i2c_busses(struct intelfb_info *dinfo)
139 {
140         int i = 0;
141
142         /* everyone has at least a single analog output */
143         dinfo->num_outputs = 1;
144         dinfo->output[i].type = INTELFB_OUTPUT_ANALOG;
145
146         /* setup the DDC bus for analog output */
147         intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus, GPIOA,
148                               "CRTDDC_A");
149         i++;
150
151         /* need to add the output busses for each device
152            - this function is very incomplete
153            - i915GM has LVDS and TVOUT for example
154         */
155         switch(dinfo->chipset) {
156         case INTEL_830M:
157         case INTEL_845G:
158         case INTEL_855GM:
159         case INTEL_865G:
160                 dinfo->output[i].type = INTELFB_OUTPUT_DVO;
161                 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus,
162                                       GPIOD, "DVODDC_D");
163                 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus,
164                                       GPIOE, "DVOI2C_E");
165                 i++;
166                 break;
167         case INTEL_915G:
168         case INTEL_915GM:
169                 /* has some LVDS + tv-out */
170         case INTEL_945G:
171         case INTEL_945GM:
172         case INTEL_965G:
173         case INTEL_965GM:
174                 /* SDVO ports have a single control bus - 2 devices */
175                 dinfo->output[i].type = INTELFB_OUTPUT_SDVO;
176                 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus,
177                                       GPIOE, "SDVOCTRL_E");
178                 /* TODO: initialize the SDVO */
179                 /* I830SDVOInit(pScrn, i, DVOB); */
180                 i++;
181
182                 /* set up SDVOC */
183                 dinfo->output[i].type = INTELFB_OUTPUT_SDVO;
184                 dinfo->output[i].i2c_bus = dinfo->output[i - 1].i2c_bus;
185                 /* TODO: initialize the SDVO */
186                 /* I830SDVOInit(pScrn, i, DVOC); */
187                 i++;
188                 break;
189         }
190         dinfo->num_outputs = i;
191 }
192
193 void intelfb_delete_i2c_busses(struct intelfb_info *dinfo)
194 {
195         int i;
196
197         for (i = 0; i < MAX_OUTPUTS; i++) {
198                 if (dinfo->output[i].i2c_bus.dinfo) {
199                         i2c_del_adapter(&dinfo->output[i].i2c_bus.adapter);
200                         dinfo->output[i].i2c_bus.dinfo = NULL;
201                 }
202                 if (dinfo->output[i].ddc_bus.dinfo) {
203                         i2c_del_adapter(&dinfo->output[i].ddc_bus.adapter);
204                         dinfo->output[i].ddc_bus.dinfo = NULL;
205                 }
206         }
207 }