dvo_sil164.c

  1/**************************************************************************
  2
  3Copyright © 2006 Dave Airlie
  4
  5All Rights Reserved.
  6
  7Permission is hereby granted, free of charge, to any person obtaining a
  8copy of this software and associated documentation files (the
  9"Software"), to deal in the Software without restriction, including
 10without limitation the rights to use, copy, modify, merge, publish,
 11distribute, sub license, and/or sell copies of the Software, and to
 12permit persons to whom the Software is furnished to do so, subject to
 13the following conditions:
 14
 15The above copyright notice and this permission notice (including the
 16next paragraph) shall be included in all copies or substantial portions
 17of the Software.
 18
 19THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 20OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 21MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 22IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 23ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 24TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 25SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 26
 27**************************************************************************/
 28
 29#include <drm/drm_print.h>
 30
 31#include "intel_display_types.h"
 32#include "intel_dvo_dev.h"
 33
 34#define SIL164_VID 0x0001
 35#define SIL164_DID 0x0006
 36
 37#define SIL164_VID_LO 0x00
 38#define SIL164_VID_HI 0x01
 39#define SIL164_DID_LO 0x02
 40#define SIL164_DID_HI 0x03
 41#define SIL164_REV    0x04
 42#define SIL164_RSVD   0x05
 43#define SIL164_FREQ_LO 0x06
 44#define SIL164_FREQ_HI 0x07
 45
 46#define SIL164_REG8 0x08
 47#define SIL164_8_VEN (1<<5)
 48#define SIL164_8_HEN (1<<4)
 49#define SIL164_8_DSEL (1<<3)
 50#define SIL164_8_BSEL (1<<2)
 51#define SIL164_8_EDGE (1<<1)
 52#define SIL164_8_PD   (1<<0)
 53
 54#define SIL164_REG9 0x09
 55#define SIL164_9_VLOW (1<<7)
 56#define SIL164_9_MSEL_MASK (0x7<<4)
 57#define SIL164_9_TSEL (1<<3)
 58#define SIL164_9_RSEN (1<<2)
 59#define SIL164_9_HTPLG (1<<1)
 60#define SIL164_9_MDI (1<<0)
 61
 62#define SIL164_REGC 0x0c
 63#define SIL164_C_SCNT (1<<7)
 64#define SIL164_C_PLLF_MASK (0xf<<1)
 65#define SIL164_C_PLLF_REC (4<<1)
 66#define SIL164_C_PFEN (1<<0)
 67
 68struct sil164_priv {
 69	//I2CDevRec d;
 70	bool quiet;
 71};
 72
 73#define SILPTR(d) ((SIL164Ptr)(d->DriverPrivate.ptr))
 74
 75static bool sil164_readb(struct intel_dvo_device *dvo, int addr, u8 *ch)
 76{
 77	struct sil164_priv *sil = dvo->dev_priv;
 78	struct i2c_adapter *adapter = dvo->i2c_bus;
 79	u8 out_buf[2];
 80	u8 in_buf[2];
 81
 82	struct i2c_msg msgs[] = {
 83		{
 84			.addr = dvo->target_addr,
 85			.flags = 0,
 86			.len = 1,
 87			.buf = out_buf,
 88		},
 89		{
 90			.addr = dvo->target_addr,
 91			.flags = I2C_M_RD,
 92			.len = 1,
 93			.buf = in_buf,
 94		}
 95	};
 96
 97	out_buf[0] = addr;
 98	out_buf[1] = 0;
 99
100	if (i2c_transfer(adapter, msgs, 2) == 2) {
101		*ch = in_buf[0];
102		return true;
103	}
104
105	if (!sil->quiet) {
106		DRM_DEBUG_KMS("Unable to read register 0x%02x from %s:%02x.\n",
107			  addr, adapter->name, dvo->target_addr);
108	}
109	return false;
110}
111
112static bool sil164_writeb(struct intel_dvo_device *dvo, int addr, u8 ch)
113{
114	struct sil164_priv *sil = dvo->dev_priv;
115	struct i2c_adapter *adapter = dvo->i2c_bus;
116	u8 out_buf[2];
117	struct i2c_msg msg = {
118		.addr = dvo->target_addr,
119		.flags = 0,
120		.len = 2,
121		.buf = out_buf,
122	};
123
124	out_buf[0] = addr;
125	out_buf[1] = ch;
126
127	if (i2c_transfer(adapter, &msg, 1) == 1)
128		return true;
129
130	if (!sil->quiet) {
131		DRM_DEBUG_KMS("Unable to write register 0x%02x to %s:%d.\n",
132			  addr, adapter->name, dvo->target_addr);
133	}
134
135	return false;
136}
137
138/* Silicon Image 164 driver for chip on i2c bus */
139static bool sil164_init(struct intel_dvo_device *dvo,
140			struct i2c_adapter *adapter)
141{
142	/* this will detect the SIL164 chip on the specified i2c bus */
143	struct sil164_priv *sil;
144	unsigned char ch;
145
146	sil = kzalloc(sizeof(*sil), GFP_KERNEL);
147	if (sil == NULL)
148		return false;
149
150	dvo->i2c_bus = adapter;
151	dvo->dev_priv = sil;
152	sil->quiet = true;
153
154	if (!sil164_readb(dvo, SIL164_VID_LO, &ch))
155		goto out;
156
157	if (ch != (SIL164_VID & 0xff)) {
158		DRM_DEBUG_KMS("sil164 not detected got %d: from %s Target %d.\n",
159			  ch, adapter->name, dvo->target_addr);
160		goto out;
161	}
162
163	if (!sil164_readb(dvo, SIL164_DID_LO, &ch))
164		goto out;
165
166	if (ch != (SIL164_DID & 0xff)) {
167		DRM_DEBUG_KMS("sil164 not detected got %d: from %s Target %d.\n",
168			  ch, adapter->name, dvo->target_addr);
169		goto out;
170	}
171	sil->quiet = false;
172
173	DRM_DEBUG_KMS("init sil164 dvo controller successfully!\n");
174	return true;
175
176out:
177	kfree(sil);
178	return false;
179}
180
181static enum drm_connector_status sil164_detect(struct intel_dvo_device *dvo)
182{
183	u8 reg9;
184
185	sil164_readb(dvo, SIL164_REG9, &reg9);
186
187	if (reg9 & SIL164_9_HTPLG)
188		return connector_status_connected;
189	else
190		return connector_status_disconnected;
191}
192
193static enum drm_mode_status sil164_mode_valid(struct intel_dvo_device *dvo,
194					      const struct drm_display_mode *mode)
195{
196	return MODE_OK;
197}
198
199static void sil164_mode_set(struct intel_dvo_device *dvo,
200			    const struct drm_display_mode *mode,
201			    const struct drm_display_mode *adjusted_mode)
202{
203	/* As long as the basics are set up, since we don't have clock
204	 * dependencies in the mode setup, we can just leave the
205	 * registers alone and everything will work fine.
206	 */
207	/* recommended programming sequence from doc */
208	/*sil164_writeb(sil, 0x08, 0x30);
209	  sil164_writeb(sil, 0x09, 0x00);
210	  sil164_writeb(sil, 0x0a, 0x90);
211	  sil164_writeb(sil, 0x0c, 0x89);
212	  sil164_writeb(sil, 0x08, 0x31);*/
213	/* don't do much */
214
215	sil164_writeb(dvo, SIL164_REG8,
216		      SIL164_8_VEN | SIL164_8_HEN);
217	sil164_writeb(dvo, SIL164_REG9,
218		      SIL164_9_TSEL);
219	sil164_writeb(dvo, SIL164_REGC,
220		      SIL164_C_PLLF_REC | SIL164_C_PFEN);
221}
222
223/* set the SIL164 power state */
224static void sil164_dpms(struct intel_dvo_device *dvo, bool enable)
225{
226	int ret;
227	unsigned char ch;
228
229	ret = sil164_readb(dvo, SIL164_REG8, &ch);
230	if (ret == false)
231		return;
232
233	if (enable)
234		ch |= SIL164_8_PD;
235	else
236		ch &= ~SIL164_8_PD;
237
238	sil164_writeb(dvo, SIL164_REG8, ch);
239}
240
241static bool sil164_get_hw_state(struct intel_dvo_device *dvo)
242{
243	int ret;
244	unsigned char ch;
245
246	ret = sil164_readb(dvo, SIL164_REG8, &ch);
247	if (ret == false)
248		return false;
249
250	if (ch & SIL164_8_PD)
251		return true;
252	else
253		return false;
254}
255
256static void sil164_dump_regs(struct intel_dvo_device *dvo)
257{
258	u8 val;
259
260	sil164_readb(dvo, SIL164_FREQ_LO, &val);
261	DRM_DEBUG_KMS("SIL164_FREQ_LO: 0x%02x\n", val);
262	sil164_readb(dvo, SIL164_FREQ_HI, &val);
263	DRM_DEBUG_KMS("SIL164_FREQ_HI: 0x%02x\n", val);
264	sil164_readb(dvo, SIL164_REG8, &val);
265	DRM_DEBUG_KMS("SIL164_REG8: 0x%02x\n", val);
266	sil164_readb(dvo, SIL164_REG9, &val);
267	DRM_DEBUG_KMS("SIL164_REG9: 0x%02x\n", val);
268	sil164_readb(dvo, SIL164_REGC, &val);
269	DRM_DEBUG_KMS("SIL164_REGC: 0x%02x\n", val);
270}
271
272static void sil164_destroy(struct intel_dvo_device *dvo)
273{
274	struct sil164_priv *sil = dvo->dev_priv;
275
276	if (sil) {
277		kfree(sil);
278		dvo->dev_priv = NULL;
279	}
280}
281
282const struct intel_dvo_dev_ops sil164_ops = {
283	.init = sil164_init,
284	.detect = sil164_detect,
285	.mode_valid = sil164_mode_valid,
286	.mode_set = sil164_mode_set,
287	.dpms = sil164_dpms,
288	.get_hw_state = sil164_get_hw_state,
289	.dump_regs = sil164_dump_regs,
290	.destroy = sil164_destroy,
291};