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-algo-bit.h>
36 
37 #include <asm/io.h>
38 
39 #include "intelfb.h"
40 #include "intelfbhw.h"
41 
42 /* bit locations in the registers */
43 #define SCL_DIR_MASK		0x0001
44 #define SCL_DIR			0x0002
45 #define SCL_VAL_MASK		0x0004
46 #define SCL_VAL_OUT		0x0008
47 #define SCL_VAL_IN		0x0010
48 #define SDA_DIR_MASK		0x0100
49 #define SDA_DIR			0x0200
50 #define SDA_VAL_MASK		0x0400
51 #define SDA_VAL_OUT		0x0800
52 #define SDA_VAL_IN		0x1000
53 
intelfb_gpio_setscl(void * data,int state)54 static void intelfb_gpio_setscl(void *data, int state)
55 {
56 	struct intelfb_i2c_chan *chan = data;
57 	struct intelfb_info *dinfo = chan->dinfo;
58 	u32 val;
59 
60 	OUTREG(chan->reg, (state ? SCL_VAL_OUT : 0) |
61 	       SCL_DIR | SCL_DIR_MASK | SCL_VAL_MASK);
62 	val = INREG(chan->reg);
63 }
64 
intelfb_gpio_setsda(void * data,int state)65 static void intelfb_gpio_setsda(void *data, int state)
66 {
67 	struct intelfb_i2c_chan *chan = data;
68 	struct intelfb_info *dinfo = chan->dinfo;
69 	u32 val;
70 
71 	OUTREG(chan->reg, (state ? SDA_VAL_OUT : 0) |
72 	       SDA_DIR | SDA_DIR_MASK | SDA_VAL_MASK);
73 	val = INREG(chan->reg);
74 }
75 
intelfb_gpio_getscl(void * data)76 static int intelfb_gpio_getscl(void *data)
77 {
78 	struct intelfb_i2c_chan *chan = data;
79 	struct intelfb_info *dinfo = chan->dinfo;
80 	u32 val;
81 
82 	OUTREG(chan->reg, SCL_DIR_MASK);
83 	OUTREG(chan->reg, 0);
84 	val = INREG(chan->reg);
85 	return ((val & SCL_VAL_IN) != 0);
86 }
87 
intelfb_gpio_getsda(void * data)88 static int intelfb_gpio_getsda(void *data)
89 {
90 	struct intelfb_i2c_chan *chan = data;
91 	struct intelfb_info *dinfo = chan->dinfo;
92 	u32 val;
93 
94 	OUTREG(chan->reg, SDA_DIR_MASK);
95 	OUTREG(chan->reg, 0);
96 	val = INREG(chan->reg);
97 	return ((val & SDA_VAL_IN) != 0);
98 }
99 
intelfb_setup_i2c_bus(struct intelfb_info * dinfo,struct intelfb_i2c_chan * chan,const u32 reg,const char * name,int class)100 static int intelfb_setup_i2c_bus(struct intelfb_info *dinfo,
101 				 struct intelfb_i2c_chan *chan,
102 				 const u32 reg, const char *name,
103 				 int class)
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.class		= class;
112 	chan->adapter.owner		= THIS_MODULE;
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 
intelfb_create_i2c_busses(struct intelfb_info * dinfo)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", I2C_CLASS_DDC);
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_854:
159 	case INTEL_855GM:
160 	case INTEL_865G:
161 		dinfo->output[i].type = INTELFB_OUTPUT_DVO;
162 		intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus,
163 				      GPIOD, "DVODDC_D", I2C_CLASS_DDC);
164 		intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus,
165 				      GPIOE, "DVOI2C_E", 0);
166 		i++;
167 		break;
168 	case INTEL_915G:
169 	case INTEL_915GM:
170 		/* has some LVDS + tv-out */
171 	case INTEL_945G:
172 	case INTEL_945GM:
173 	case INTEL_945GME:
174 	case INTEL_965G:
175 	case INTEL_965GM:
176 		/* SDVO ports have a single control bus - 2 devices */
177 		dinfo->output[i].type = INTELFB_OUTPUT_SDVO;
178 		intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus,
179 				      GPIOE, "SDVOCTRL_E", 0);
180 		/* TODO: initialize the SDVO */
181 		/* I830SDVOInit(pScrn, i, DVOB); */
182 		i++;
183 
184 		/* set up SDVOC */
185 		dinfo->output[i].type = INTELFB_OUTPUT_SDVO;
186 		dinfo->output[i].i2c_bus = dinfo->output[i - 1].i2c_bus;
187 		/* TODO: initialize the SDVO */
188 		/* I830SDVOInit(pScrn, i, DVOC); */
189 		i++;
190 		break;
191 	}
192 	dinfo->num_outputs = i;
193 }
194 
intelfb_delete_i2c_busses(struct intelfb_info * dinfo)195 void intelfb_delete_i2c_busses(struct intelfb_info *dinfo)
196 {
197 	int i;
198 
199 	for (i = 0; i < MAX_OUTPUTS; i++) {
200 		if (dinfo->output[i].i2c_bus.dinfo) {
201 			i2c_del_adapter(&dinfo->output[i].i2c_bus.adapter);
202 			dinfo->output[i].i2c_bus.dinfo = NULL;
203 		}
204 		if (dinfo->output[i].ddc_bus.dinfo) {
205 			i2c_del_adapter(&dinfo->output[i].ddc_bus.adapter);
206 			dinfo->output[i].ddc_bus.dinfo = NULL;
207 		}
208 	}
209 }
210