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79e53945 JB |
1 | /* |
2 | * Copyright (c) 2006 Dave Airlie <airlied@linux.ie> | |
f899fc64 | 3 | * Copyright © 2006-2008,2010 Intel Corporation |
79e53945 JB |
4 | * Jesse Barnes <jesse.barnes@intel.com> |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a | |
7 | * copy of this software and associated documentation files (the "Software"), | |
8 | * to deal in the Software without restriction, including without limitation | |
9 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
10 | * and/or sell copies of the Software, and to permit persons to whom the | |
11 | * Software is furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice (including the next | |
14 | * paragraph) shall be included in all copies or substantial portions of the | |
15 | * Software. | |
16 | * | |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
22 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |
23 | * DEALINGS IN THE SOFTWARE. | |
24 | * | |
25 | * Authors: | |
26 | * Eric Anholt <eric@anholt.net> | |
f899fc64 | 27 | * Chris Wilson <chris@chris-wilson.co.uk> |
79e53945 JB |
28 | */ |
29 | #include <linux/i2c.h> | |
79e53945 JB |
30 | #include <linux/i2c-algo-bit.h> |
31 | #include "drmP.h" | |
32 | #include "drm.h" | |
33 | #include "intel_drv.h" | |
34 | #include "i915_drm.h" | |
35 | #include "i915_drv.h" | |
36 | ||
f899fc64 CW |
37 | /* Intel GPIO access functions */ |
38 | ||
39 | #define I2C_RISEFALL_TIME 20 | |
40 | ||
41 | struct intel_gpio { | |
42 | struct i2c_adapter adapter; | |
43 | struct i2c_algo_bit_data algo; | |
44 | struct drm_i915_private *dev_priv; | |
45 | u32 reg; | |
46 | }; | |
47 | ||
48 | void | |
49 | intel_i2c_reset(struct drm_device *dev) | |
0ba0e9e1 SL |
50 | { |
51 | struct drm_i915_private *dev_priv = dev->dev_private; | |
f899fc64 CW |
52 | if (HAS_PCH_SPLIT(dev)) |
53 | I915_WRITE(PCH_GMBUS0, 0); | |
54 | else | |
55 | I915_WRITE(GMBUS0, 0); | |
56 | } | |
57 | ||
58 | static void intel_i2c_quirk_set(struct drm_i915_private *dev_priv, bool enable) | |
59 | { | |
b222f267 | 60 | u32 val; |
0ba0e9e1 SL |
61 | |
62 | /* When using bit bashing for I2C, this bit needs to be set to 1 */ | |
f899fc64 | 63 | if (!IS_PINEVIEW(dev_priv->dev)) |
0ba0e9e1 | 64 | return; |
b222f267 CW |
65 | |
66 | val = I915_READ(DSPCLK_GATE_D); | |
0ba0e9e1 | 67 | if (enable) |
b222f267 | 68 | val |= DPCUNIT_CLOCK_GATE_DISABLE; |
0ba0e9e1 | 69 | else |
b222f267 CW |
70 | val &= ~DPCUNIT_CLOCK_GATE_DISABLE; |
71 | I915_WRITE(DSPCLK_GATE_D, val); | |
0ba0e9e1 SL |
72 | } |
73 | ||
79e53945 JB |
74 | static int get_clock(void *data) |
75 | { | |
f899fc64 CW |
76 | struct intel_gpio *gpio = data; |
77 | struct drm_i915_private *dev_priv = gpio->dev_priv; | |
78 | return (I915_READ(gpio->reg) & GPIO_CLOCK_VAL_IN) != 0; | |
79e53945 JB |
79 | } |
80 | ||
81 | static int get_data(void *data) | |
82 | { | |
f899fc64 CW |
83 | struct intel_gpio *gpio = data; |
84 | struct drm_i915_private *dev_priv = gpio->dev_priv; | |
85 | return (I915_READ(gpio->reg) & GPIO_DATA_VAL_IN) != 0; | |
79e53945 JB |
86 | } |
87 | ||
88 | static void set_clock(void *data, int state_high) | |
89 | { | |
f899fc64 CW |
90 | struct intel_gpio *gpio = data; |
91 | struct drm_i915_private *dev_priv = gpio->dev_priv; | |
890f3359 | 92 | struct drm_device *dev = dev_priv->dev; |
79e53945 JB |
93 | u32 reserved = 0, clock_bits; |
94 | ||
95 | /* On most chips, these bits must be preserved in software. */ | |
96 | if (!IS_I830(dev) && !IS_845G(dev)) | |
f899fc64 | 97 | reserved = I915_READ(gpio->reg) & (GPIO_DATA_PULLUP_DISABLE | |
79e53945 JB |
98 | GPIO_CLOCK_PULLUP_DISABLE); |
99 | ||
100 | if (state_high) | |
101 | clock_bits = GPIO_CLOCK_DIR_IN | GPIO_CLOCK_DIR_MASK; | |
102 | else | |
103 | clock_bits = GPIO_CLOCK_DIR_OUT | GPIO_CLOCK_DIR_MASK | | |
104 | GPIO_CLOCK_VAL_MASK; | |
f899fc64 CW |
105 | |
106 | I915_WRITE(gpio->reg, reserved | clock_bits); | |
107 | POSTING_READ(gpio->reg); | |
79e53945 JB |
108 | } |
109 | ||
110 | static void set_data(void *data, int state_high) | |
111 | { | |
f899fc64 CW |
112 | struct intel_gpio *gpio = data; |
113 | struct drm_i915_private *dev_priv = gpio->dev_priv; | |
890f3359 | 114 | struct drm_device *dev = dev_priv->dev; |
79e53945 JB |
115 | u32 reserved = 0, data_bits; |
116 | ||
117 | /* On most chips, these bits must be preserved in software. */ | |
118 | if (!IS_I830(dev) && !IS_845G(dev)) | |
f899fc64 | 119 | reserved = I915_READ(gpio->reg) & (GPIO_DATA_PULLUP_DISABLE | |
79e53945 JB |
120 | GPIO_CLOCK_PULLUP_DISABLE); |
121 | ||
122 | if (state_high) | |
123 | data_bits = GPIO_DATA_DIR_IN | GPIO_DATA_DIR_MASK; | |
124 | else | |
125 | data_bits = GPIO_DATA_DIR_OUT | GPIO_DATA_DIR_MASK | | |
126 | GPIO_DATA_VAL_MASK; | |
127 | ||
f899fc64 CW |
128 | I915_WRITE(gpio->reg, reserved | data_bits); |
129 | POSTING_READ(gpio->reg); | |
79e53945 JB |
130 | } |
131 | ||
f899fc64 CW |
132 | static struct i2c_adapter * |
133 | intel_gpio_create(struct drm_i915_private *dev_priv, u32 pin) | |
f0217c42 | 134 | { |
f899fc64 CW |
135 | static const int map_pin_to_reg[] = { |
136 | 0, | |
137 | GPIOB, | |
138 | GPIOA, | |
139 | GPIOC, | |
140 | GPIOD, | |
141 | GPIOE, | |
142 | GPIOF, | |
143 | }; | |
144 | struct intel_gpio *gpio; | |
f0217c42 | 145 | |
f899fc64 CW |
146 | if (pin < 1 || pin > 7) |
147 | return NULL; | |
f0217c42 | 148 | |
f899fc64 CW |
149 | gpio = kzalloc(sizeof(struct intel_gpio), GFP_KERNEL); |
150 | if (gpio == NULL) | |
151 | return NULL; | |
79e53945 | 152 | |
f899fc64 CW |
153 | gpio->reg = map_pin_to_reg[pin]; |
154 | if (HAS_PCH_SPLIT(dev_priv->dev)) | |
155 | gpio->reg += PCH_GPIOA - GPIOA; | |
156 | gpio->dev_priv = dev_priv; | |
79e53945 | 157 | |
f899fc64 CW |
158 | snprintf(gpio->adapter.name, I2C_NAME_SIZE, "GPIO %d", pin); |
159 | gpio->adapter.owner = THIS_MODULE; | |
160 | gpio->adapter.algo_data = &gpio->algo; | |
161 | gpio->adapter.dev.parent = &dev_priv->dev->pdev->dev; | |
162 | gpio->algo.setsda = set_data; | |
163 | gpio->algo.setscl = set_clock; | |
164 | gpio->algo.getsda = get_data; | |
165 | gpio->algo.getscl = get_clock; | |
166 | gpio->algo.udelay = I2C_RISEFALL_TIME; | |
167 | gpio->algo.timeout = usecs_to_jiffies(2200); | |
168 | gpio->algo.data = gpio; | |
169 | ||
170 | if (i2c_bit_add_bus(&gpio->adapter)) | |
79e53945 JB |
171 | goto out_free; |
172 | ||
f899fc64 | 173 | intel_i2c_reset(dev_priv->dev); |
f0217c42 | 174 | |
79e53945 | 175 | /* JJJ: raise SCL and SDA? */ |
f899fc64 CW |
176 | intel_i2c_quirk_set(dev_priv, true); |
177 | set_data(gpio, 1); | |
b222f267 | 178 | udelay(I2C_RISEFALL_TIME); |
f899fc64 | 179 | set_clock(gpio, 1); |
b222f267 | 180 | udelay(I2C_RISEFALL_TIME); |
f899fc64 | 181 | intel_i2c_quirk_set(dev_priv, false); |
79e53945 | 182 | |
f899fc64 | 183 | return &gpio->adapter; |
79e53945 JB |
184 | |
185 | out_free: | |
f899fc64 | 186 | kfree(gpio); |
79e53945 JB |
187 | return NULL; |
188 | } | |
189 | ||
f899fc64 CW |
190 | static int |
191 | quirk_i2c_transfer(struct drm_i915_private *dev_priv, | |
192 | struct i2c_adapter *adapter, | |
193 | struct i2c_msg *msgs, | |
194 | int num) | |
195 | { | |
196 | int ret; | |
197 | ||
198 | intel_i2c_reset(dev_priv->dev); | |
199 | ||
200 | intel_i2c_quirk_set(dev_priv, true); | |
201 | ret = i2c_transfer(adapter, msgs, num); | |
202 | intel_i2c_quirk_set(dev_priv, false); | |
203 | ||
204 | return ret; | |
205 | } | |
206 | ||
207 | static int | |
208 | gmbus_xfer(struct i2c_adapter *adapter, | |
209 | struct i2c_msg *msgs, | |
210 | int num) | |
211 | { | |
212 | struct intel_gmbus *bus = container_of(adapter, | |
213 | struct intel_gmbus, | |
214 | adapter); | |
215 | struct drm_i915_private *dev_priv = adapter->algo_data; | |
216 | int i, speed, reg_offset; | |
217 | ||
218 | if (bus->force_bitbanging) | |
219 | return quirk_i2c_transfer(dev_priv, bus->force_bitbanging, msgs, num); | |
220 | ||
221 | reg_offset = HAS_PCH_SPLIT(dev_priv->dev) ? PCH_GMBUS0 - GMBUS0 : 0; | |
222 | ||
223 | speed = GMBUS_RATE_100KHZ; | |
224 | if (INTEL_INFO(dev_priv->dev)->gen > 4 || IS_G4X(dev_priv->dev)) { | |
225 | if (bus->pin == GMBUS_PORT_DPB) /* SDVO only? */ | |
226 | speed = GMBUS_RATE_1MHZ; | |
227 | else | |
228 | speed = GMBUS_RATE_400KHZ; | |
229 | } | |
230 | I915_WRITE(GMBUS0 + reg_offset, speed | bus->pin); | |
231 | ||
232 | for (i = 0; i < num; i++) { | |
233 | u16 len = msgs[i].len; | |
234 | u8 *buf = msgs[i].buf; | |
235 | ||
236 | if (msgs[i].flags & I2C_M_RD) { | |
237 | I915_WRITE(GMBUS1 + reg_offset, | |
238 | GMBUS_CYCLE_WAIT | (i + 1 == num ? GMBUS_CYCLE_STOP : 0) | | |
239 | (len << GMBUS_BYTE_COUNT_SHIFT) | | |
240 | (msgs[i].addr << GMBUS_SLAVE_ADDR_SHIFT) | | |
241 | GMBUS_SLAVE_READ | GMBUS_SW_RDY); | |
242 | do { | |
243 | u32 val, loop = 0; | |
244 | ||
245 | if (wait_for(I915_READ(GMBUS2 + reg_offset) & (GMBUS_SATOER | GMBUS_HW_RDY), 50)) | |
246 | goto timeout; | |
247 | if (I915_READ(GMBUS2 + reg_offset) & GMBUS_SATOER) | |
248 | return 0; | |
249 | ||
250 | val = I915_READ(GMBUS3 + reg_offset); | |
251 | do { | |
252 | *buf++ = val & 0xff; | |
253 | val >>= 8; | |
254 | } while (--len && ++loop < 4); | |
255 | } while (len); | |
256 | } else { | |
257 | u32 val = 0, loop = 0; | |
258 | ||
259 | BUG_ON(msgs[i].len > 4); | |
260 | ||
261 | do { | |
262 | val |= *buf++ << (loop*8); | |
263 | } while (--len && +loop < 4); | |
264 | ||
265 | I915_WRITE(GMBUS3 + reg_offset, val); | |
266 | I915_WRITE(GMBUS1 + reg_offset, | |
267 | (i + 1 == num ? GMBUS_CYCLE_STOP : GMBUS_CYCLE_WAIT ) | | |
268 | (msgs[i].len << GMBUS_BYTE_COUNT_SHIFT) | | |
269 | (msgs[i].addr << GMBUS_SLAVE_ADDR_SHIFT) | | |
270 | GMBUS_SLAVE_WRITE | GMBUS_SW_RDY); | |
271 | } | |
272 | ||
273 | if (i + 1 < num && wait_for(I915_READ(GMBUS2 + reg_offset) & (GMBUS_SATOER | GMBUS_HW_WAIT_PHASE), 50)) | |
274 | goto timeout; | |
275 | if (I915_READ(GMBUS2 + reg_offset) & GMBUS_SATOER) | |
276 | return 0; | |
277 | } | |
278 | ||
279 | return num; | |
280 | ||
281 | timeout: | |
282 | DRM_INFO("GMBUS timed out, falling back to bit banging on pin %d\n", bus->pin); | |
283 | /* Hardware may not support GMBUS over these pins? Try GPIO bitbanging instead. */ | |
284 | bus->force_bitbanging = intel_gpio_create(dev_priv, bus->pin); | |
285 | if (!bus->force_bitbanging) | |
286 | return -ENOMEM; | |
287 | ||
288 | return quirk_i2c_transfer(dev_priv, bus->force_bitbanging, msgs, num); | |
289 | } | |
290 | ||
291 | static u32 gmbus_func(struct i2c_adapter *adapter) | |
292 | { | |
293 | return (I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | | |
294 | /* I2C_FUNC_10BIT_ADDR | */ | |
295 | I2C_FUNC_SMBUS_READ_BLOCK_DATA | | |
296 | I2C_FUNC_SMBUS_BLOCK_PROC_CALL); | |
297 | } | |
298 | ||
299 | static const struct i2c_algorithm gmbus_algorithm = { | |
300 | .master_xfer = gmbus_xfer, | |
301 | .functionality = gmbus_func | |
302 | }; | |
303 | ||
79e53945 | 304 | /** |
f899fc64 CW |
305 | * intel_gmbus_setup - instantiate all Intel i2c GMBuses |
306 | * @dev: DRM device | |
79e53945 | 307 | */ |
f899fc64 CW |
308 | int intel_setup_gmbus(struct drm_device *dev) |
309 | { | |
310 | static const char *names[] = { | |
311 | "disabled", | |
312 | "ssc", | |
313 | "vga", | |
314 | "panel", | |
315 | "dpc", | |
316 | "dpb", | |
317 | "dpd", | |
318 | "reserved" | |
319 | }; | |
320 | struct drm_i915_private *dev_priv = dev->dev_private; | |
321 | int ret, i; | |
322 | ||
323 | dev_priv->gmbus = kcalloc(sizeof(struct intel_gmbus), GMBUS_NUM_PORTS, | |
324 | GFP_KERNEL); | |
325 | if (dev_priv->gmbus == NULL) | |
326 | return -ENOMEM; | |
327 | ||
328 | for (i = 0; i < GMBUS_NUM_PORTS; i++) { | |
329 | struct intel_gmbus *bus = &dev_priv->gmbus[i]; | |
330 | ||
331 | bus->adapter.owner = THIS_MODULE; | |
332 | bus->adapter.class = I2C_CLASS_DDC; | |
333 | snprintf(bus->adapter.name, | |
334 | I2C_NAME_SIZE, | |
335 | "gmbus %s", | |
336 | names[i]); | |
337 | ||
338 | bus->adapter.dev.parent = &dev->pdev->dev; | |
339 | bus->adapter.algo_data = dev_priv; | |
340 | ||
341 | bus->adapter.algo = &gmbus_algorithm; | |
342 | ret = i2c_add_adapter(&bus->adapter); | |
343 | if (ret) | |
344 | goto err; | |
345 | ||
346 | bus->pin = i; | |
347 | } | |
348 | ||
349 | intel_i2c_reset(dev_priv->dev); | |
350 | ||
351 | return 0; | |
352 | ||
353 | err: | |
354 | while (--i) { | |
355 | struct intel_gmbus *bus = &dev_priv->gmbus[i]; | |
356 | i2c_del_adapter(&bus->adapter); | |
357 | } | |
358 | kfree(dev_priv->gmbus); | |
359 | dev_priv->gmbus = NULL; | |
360 | return ret; | |
361 | } | |
362 | ||
363 | void intel_teardown_gmbus(struct drm_device *dev) | |
79e53945 | 364 | { |
f899fc64 CW |
365 | struct drm_i915_private *dev_priv = dev->dev_private; |
366 | int i; | |
f9c10a9b | 367 | |
f899fc64 | 368 | if (dev_priv->gmbus == NULL) |
79e53945 JB |
369 | return; |
370 | ||
f899fc64 CW |
371 | for (i = 0; i < GMBUS_NUM_PORTS; i++) { |
372 | struct intel_gmbus *bus = &dev_priv->gmbus[i]; | |
373 | if (bus->force_bitbanging) { | |
374 | i2c_del_adapter(bus->force_bitbanging); | |
375 | kfree(bus->force_bitbanging); | |
376 | } | |
377 | i2c_del_adapter(&bus->adapter); | |
378 | } | |
379 | ||
380 | kfree(dev_priv->gmbus); | |
381 | dev_priv->gmbus = NULL; | |
79e53945 | 382 | } |