xref: /linux/drivers/gpu/drm/i915/display/dvo_sil164.c (revision 34dc1baba215b826e454b8d19e4f24adbeb7d00d)
1 /**************************************************************************
2 
3 Copyright © 2006 Dave Airlie
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
9 "Software"), to deal in the Software without restriction, including
10 without limitation the rights to use, copy, modify, merge, publish,
11 distribute, sub license, and/or sell copies of the Software, and to
12 permit persons to whom the Software is furnished to do so, subject to
13 the following conditions:
14 
15 The above copyright notice and this permission notice (including the
16 next paragraph) shall be included in all copies or substantial portions
17 of the Software.
18 
19 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
22 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
23 ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
24 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
25 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 
27 **************************************************************************/
28 
29 #include "intel_display_types.h"
30 #include "intel_dvo_dev.h"
31 
32 #define SIL164_VID 0x0001
33 #define SIL164_DID 0x0006
34 
35 #define SIL164_VID_LO 0x00
36 #define SIL164_VID_HI 0x01
37 #define SIL164_DID_LO 0x02
38 #define SIL164_DID_HI 0x03
39 #define SIL164_REV    0x04
40 #define SIL164_RSVD   0x05
41 #define SIL164_FREQ_LO 0x06
42 #define SIL164_FREQ_HI 0x07
43 
44 #define SIL164_REG8 0x08
45 #define SIL164_8_VEN (1<<5)
46 #define SIL164_8_HEN (1<<4)
47 #define SIL164_8_DSEL (1<<3)
48 #define SIL164_8_BSEL (1<<2)
49 #define SIL164_8_EDGE (1<<1)
50 #define SIL164_8_PD   (1<<0)
51 
52 #define SIL164_REG9 0x09
53 #define SIL164_9_VLOW (1<<7)
54 #define SIL164_9_MSEL_MASK (0x7<<4)
55 #define SIL164_9_TSEL (1<<3)
56 #define SIL164_9_RSEN (1<<2)
57 #define SIL164_9_HTPLG (1<<1)
58 #define SIL164_9_MDI (1<<0)
59 
60 #define SIL164_REGC 0x0c
61 #define SIL164_C_SCNT (1<<7)
62 #define SIL164_C_PLLF_MASK (0xf<<1)
63 #define SIL164_C_PLLF_REC (4<<1)
64 #define SIL164_C_PFEN (1<<0)
65 
66 struct sil164_priv {
67 	//I2CDevRec d;
68 	bool quiet;
69 };
70 
71 #define SILPTR(d) ((SIL164Ptr)(d->DriverPrivate.ptr))
72 
73 static bool sil164_readb(struct intel_dvo_device *dvo, int addr, u8 *ch)
74 {
75 	struct sil164_priv *sil = dvo->dev_priv;
76 	struct i2c_adapter *adapter = dvo->i2c_bus;
77 	u8 out_buf[2];
78 	u8 in_buf[2];
79 
80 	struct i2c_msg msgs[] = {
81 		{
82 			.addr = dvo->slave_addr,
83 			.flags = 0,
84 			.len = 1,
85 			.buf = out_buf,
86 		},
87 		{
88 			.addr = dvo->slave_addr,
89 			.flags = I2C_M_RD,
90 			.len = 1,
91 			.buf = in_buf,
92 		}
93 	};
94 
95 	out_buf[0] = addr;
96 	out_buf[1] = 0;
97 
98 	if (i2c_transfer(adapter, msgs, 2) == 2) {
99 		*ch = in_buf[0];
100 		return true;
101 	}
102 
103 	if (!sil->quiet) {
104 		DRM_DEBUG_KMS("Unable to read register 0x%02x from %s:%02x.\n",
105 			  addr, adapter->name, dvo->slave_addr);
106 	}
107 	return false;
108 }
109 
110 static bool sil164_writeb(struct intel_dvo_device *dvo, int addr, u8 ch)
111 {
112 	struct sil164_priv *sil = dvo->dev_priv;
113 	struct i2c_adapter *adapter = dvo->i2c_bus;
114 	u8 out_buf[2];
115 	struct i2c_msg msg = {
116 		.addr = dvo->slave_addr,
117 		.flags = 0,
118 		.len = 2,
119 		.buf = out_buf,
120 	};
121 
122 	out_buf[0] = addr;
123 	out_buf[1] = ch;
124 
125 	if (i2c_transfer(adapter, &msg, 1) == 1)
126 		return true;
127 
128 	if (!sil->quiet) {
129 		DRM_DEBUG_KMS("Unable to write register 0x%02x to %s:%d.\n",
130 			  addr, adapter->name, dvo->slave_addr);
131 	}
132 
133 	return false;
134 }
135 
136 /* Silicon Image 164 driver for chip on i2c bus */
137 static bool sil164_init(struct intel_dvo_device *dvo,
138 			struct i2c_adapter *adapter)
139 {
140 	/* this will detect the SIL164 chip on the specified i2c bus */
141 	struct sil164_priv *sil;
142 	unsigned char ch;
143 
144 	sil = kzalloc(sizeof(struct sil164_priv), GFP_KERNEL);
145 	if (sil == NULL)
146 		return false;
147 
148 	dvo->i2c_bus = adapter;
149 	dvo->dev_priv = sil;
150 	sil->quiet = true;
151 
152 	if (!sil164_readb(dvo, SIL164_VID_LO, &ch))
153 		goto out;
154 
155 	if (ch != (SIL164_VID & 0xff)) {
156 		DRM_DEBUG_KMS("sil164 not detected got %d: from %s Slave %d.\n",
157 			  ch, adapter->name, dvo->slave_addr);
158 		goto out;
159 	}
160 
161 	if (!sil164_readb(dvo, SIL164_DID_LO, &ch))
162 		goto out;
163 
164 	if (ch != (SIL164_DID & 0xff)) {
165 		DRM_DEBUG_KMS("sil164 not detected got %d: from %s Slave %d.\n",
166 			  ch, adapter->name, dvo->slave_addr);
167 		goto out;
168 	}
169 	sil->quiet = false;
170 
171 	DRM_DEBUG_KMS("init sil164 dvo controller successfully!\n");
172 	return true;
173 
174 out:
175 	kfree(sil);
176 	return false;
177 }
178 
179 static enum drm_connector_status sil164_detect(struct intel_dvo_device *dvo)
180 {
181 	u8 reg9;
182 
183 	sil164_readb(dvo, SIL164_REG9, &reg9);
184 
185 	if (reg9 & SIL164_9_HTPLG)
186 		return connector_status_connected;
187 	else
188 		return connector_status_disconnected;
189 }
190 
191 static enum drm_mode_status sil164_mode_valid(struct intel_dvo_device *dvo,
192 					      struct drm_display_mode *mode)
193 {
194 	return MODE_OK;
195 }
196 
197 static void sil164_mode_set(struct intel_dvo_device *dvo,
198 			    const struct drm_display_mode *mode,
199 			    const struct drm_display_mode *adjusted_mode)
200 {
201 	/* As long as the basics are set up, since we don't have clock
202 	 * dependencies in the mode setup, we can just leave the
203 	 * registers alone and everything will work fine.
204 	 */
205 	/* recommended programming sequence from doc */
206 	/*sil164_writeb(sil, 0x08, 0x30);
207 	  sil164_writeb(sil, 0x09, 0x00);
208 	  sil164_writeb(sil, 0x0a, 0x90);
209 	  sil164_writeb(sil, 0x0c, 0x89);
210 	  sil164_writeb(sil, 0x08, 0x31);*/
211 	/* don't do much */
212 
213 	sil164_writeb(dvo, SIL164_REG8,
214 		      SIL164_8_VEN | SIL164_8_HEN);
215 	sil164_writeb(dvo, SIL164_REG9,
216 		      SIL164_9_TSEL);
217 	sil164_writeb(dvo, SIL164_REGC,
218 		      SIL164_C_PLLF_REC | SIL164_C_PFEN);
219 }
220 
221 /* set the SIL164 power state */
222 static void sil164_dpms(struct intel_dvo_device *dvo, bool enable)
223 {
224 	int ret;
225 	unsigned char ch;
226 
227 	ret = sil164_readb(dvo, SIL164_REG8, &ch);
228 	if (ret == false)
229 		return;
230 
231 	if (enable)
232 		ch |= SIL164_8_PD;
233 	else
234 		ch &= ~SIL164_8_PD;
235 
236 	sil164_writeb(dvo, SIL164_REG8, ch);
237 }
238 
239 static bool sil164_get_hw_state(struct intel_dvo_device *dvo)
240 {
241 	int ret;
242 	unsigned char ch;
243 
244 	ret = sil164_readb(dvo, SIL164_REG8, &ch);
245 	if (ret == false)
246 		return false;
247 
248 	if (ch & SIL164_8_PD)
249 		return true;
250 	else
251 		return false;
252 }
253 
254 static void sil164_dump_regs(struct intel_dvo_device *dvo)
255 {
256 	u8 val;
257 
258 	sil164_readb(dvo, SIL164_FREQ_LO, &val);
259 	DRM_DEBUG_KMS("SIL164_FREQ_LO: 0x%02x\n", val);
260 	sil164_readb(dvo, SIL164_FREQ_HI, &val);
261 	DRM_DEBUG_KMS("SIL164_FREQ_HI: 0x%02x\n", val);
262 	sil164_readb(dvo, SIL164_REG8, &val);
263 	DRM_DEBUG_KMS("SIL164_REG8: 0x%02x\n", val);
264 	sil164_readb(dvo, SIL164_REG9, &val);
265 	DRM_DEBUG_KMS("SIL164_REG9: 0x%02x\n", val);
266 	sil164_readb(dvo, SIL164_REGC, &val);
267 	DRM_DEBUG_KMS("SIL164_REGC: 0x%02x\n", val);
268 }
269 
270 static void sil164_destroy(struct intel_dvo_device *dvo)
271 {
272 	struct sil164_priv *sil = dvo->dev_priv;
273 
274 	if (sil) {
275 		kfree(sil);
276 		dvo->dev_priv = NULL;
277 	}
278 }
279 
280 const struct intel_dvo_dev_ops sil164_ops = {
281 	.init = sil164_init,
282 	.detect = sil164_detect,
283 	.mode_valid = sil164_mode_valid,
284 	.mode_set = sil164_mode_set,
285 	.dpms = sil164_dpms,
286 	.get_hw_state = sil164_get_hw_state,
287 	.dump_regs = sil164_dump_regs,
288 	.destroy = sil164_destroy,
289 };
290