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1 | /* | |
2 | * Based on sound/arm/pxa2xx-ac97.c and sound/soc/pxa/pxa2xx-ac97.c | |
3 | * which contain: | |
4 | * | |
5 | * Author: Nicolas Pitre | |
6 | * Created: Dec 02, 2004 | |
7 | * Copyright: MontaVista Software Inc. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/clk.h> | |
18 | #include <linux/delay.h> | |
19 | ||
20 | #include <sound/ac97_codec.h> | |
21 | #include <sound/pxa2xx-lib.h> | |
22 | ||
23 | #include <asm/irq.h> | |
24 | #include <mach/regs-ac97.h> | |
25 | #include <mach/pxa2xx-gpio.h> | |
26 | #include <mach/audio.h> | |
27 | ||
28 | static DEFINE_MUTEX(car_mutex); | |
29 | static DECLARE_WAIT_QUEUE_HEAD(gsr_wq); | |
30 | static volatile long gsr_bits; | |
31 | static struct clk *ac97_clk; | |
32 | static struct clk *ac97conf_clk; | |
33 | static int reset_gpio; | |
34 | ||
35 | /* | |
36 | * Beware PXA27x bugs: | |
37 | * | |
38 | * o Slot 12 read from modem space will hang controller. | |
39 | * o CDONE, SDONE interrupt fails after any slot 12 IO. | |
40 | * | |
41 | * We therefore have an hybrid approach for waiting on SDONE (interrupt or | |
42 | * 1 jiffy timeout if interrupt never comes). | |
43 | */ | |
44 | ||
45 | enum { | |
46 | RESETGPIO_FORCE_HIGH, | |
47 | RESETGPIO_FORCE_LOW, | |
48 | RESETGPIO_NORMAL_ALTFUNC | |
49 | }; | |
50 | ||
51 | /** | |
52 | * set_resetgpio_mode - computes and sets the AC97_RESET gpio mode on PXA | |
53 | * @mode: chosen action | |
54 | * | |
55 | * As the PXA27x CPUs suffer from a AC97 bug, a manual control of the reset line | |
56 | * must be done to insure proper work of AC97 reset line. This function | |
57 | * computes the correct gpio_mode for further use by reset functions, and | |
58 | * applied the change through pxa_gpio_mode. | |
59 | */ | |
60 | static void set_resetgpio_mode(int resetgpio_action) | |
61 | { | |
62 | int mode = 0; | |
63 | ||
64 | if (reset_gpio) | |
65 | switch (resetgpio_action) { | |
66 | case RESETGPIO_NORMAL_ALTFUNC: | |
67 | if (reset_gpio == 113) | |
68 | mode = 113 | GPIO_ALT_FN_2_OUT; | |
69 | if (reset_gpio == 95) | |
70 | mode = 95 | GPIO_ALT_FN_1_OUT; | |
71 | break; | |
72 | case RESETGPIO_FORCE_LOW: | |
73 | mode = reset_gpio | GPIO_OUT | GPIO_DFLT_LOW; | |
74 | break; | |
75 | case RESETGPIO_FORCE_HIGH: | |
76 | mode = reset_gpio | GPIO_OUT | GPIO_DFLT_HIGH; | |
77 | break; | |
78 | }; | |
79 | ||
80 | if (mode) | |
81 | pxa_gpio_mode(mode); | |
82 | } | |
83 | ||
84 | unsigned short pxa2xx_ac97_read(struct snd_ac97 *ac97, unsigned short reg) | |
85 | { | |
86 | unsigned short val = -1; | |
87 | volatile u32 *reg_addr; | |
88 | ||
89 | mutex_lock(&car_mutex); | |
90 | ||
91 | /* set up primary or secondary codec space */ | |
92 | if (cpu_is_pxa25x() && reg == AC97_GPIO_STATUS) | |
93 | reg_addr = ac97->num ? &SMC_REG_BASE : &PMC_REG_BASE; | |
94 | else | |
95 | reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE; | |
96 | reg_addr += (reg >> 1); | |
97 | ||
98 | /* start read access across the ac97 link */ | |
99 | GSR = GSR_CDONE | GSR_SDONE; | |
100 | gsr_bits = 0; | |
101 | val = *reg_addr; | |
102 | if (reg == AC97_GPIO_STATUS) | |
103 | goto out; | |
104 | if (wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1) <= 0 && | |
105 | !((GSR | gsr_bits) & GSR_SDONE)) { | |
106 | printk(KERN_ERR "%s: read error (ac97_reg=%d GSR=%#lx)\n", | |
107 | __func__, reg, GSR | gsr_bits); | |
108 | val = -1; | |
109 | goto out; | |
110 | } | |
111 | ||
112 | /* valid data now */ | |
113 | GSR = GSR_CDONE | GSR_SDONE; | |
114 | gsr_bits = 0; | |
115 | val = *reg_addr; | |
116 | /* but we've just started another cycle... */ | |
117 | wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1); | |
118 | ||
119 | out: mutex_unlock(&car_mutex); | |
120 | return val; | |
121 | } | |
122 | EXPORT_SYMBOL_GPL(pxa2xx_ac97_read); | |
123 | ||
124 | void pxa2xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg, | |
125 | unsigned short val) | |
126 | { | |
127 | volatile u32 *reg_addr; | |
128 | ||
129 | mutex_lock(&car_mutex); | |
130 | ||
131 | /* set up primary or secondary codec space */ | |
132 | if (cpu_is_pxa25x() && reg == AC97_GPIO_STATUS) | |
133 | reg_addr = ac97->num ? &SMC_REG_BASE : &PMC_REG_BASE; | |
134 | else | |
135 | reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE; | |
136 | reg_addr += (reg >> 1); | |
137 | ||
138 | GSR = GSR_CDONE | GSR_SDONE; | |
139 | gsr_bits = 0; | |
140 | *reg_addr = val; | |
141 | if (wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_CDONE, 1) <= 0 && | |
142 | !((GSR | gsr_bits) & GSR_CDONE)) | |
143 | printk(KERN_ERR "%s: write error (ac97_reg=%d GSR=%#lx)\n", | |
144 | __func__, reg, GSR | gsr_bits); | |
145 | ||
146 | mutex_unlock(&car_mutex); | |
147 | } | |
148 | EXPORT_SYMBOL_GPL(pxa2xx_ac97_write); | |
149 | ||
150 | #ifdef CONFIG_PXA25x | |
151 | static inline void pxa_ac97_warm_pxa25x(void) | |
152 | { | |
153 | gsr_bits = 0; | |
154 | ||
155 | GCR |= GCR_WARM_RST | GCR_PRIRDY_IEN | GCR_SECRDY_IEN; | |
156 | wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1); | |
157 | } | |
158 | ||
159 | static inline void pxa_ac97_cold_pxa25x(void) | |
160 | { | |
161 | GCR &= GCR_COLD_RST; /* clear everything but nCRST */ | |
162 | GCR &= ~GCR_COLD_RST; /* then assert nCRST */ | |
163 | ||
164 | gsr_bits = 0; | |
165 | ||
166 | GCR = GCR_COLD_RST; | |
167 | GCR |= GCR_CDONE_IE|GCR_SDONE_IE; | |
168 | wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1); | |
169 | } | |
170 | #endif | |
171 | ||
172 | #ifdef CONFIG_PXA27x | |
173 | static inline void pxa_ac97_warm_pxa27x(void) | |
174 | { | |
175 | gsr_bits = 0; | |
176 | ||
177 | /* warm reset broken on Bulverde, | |
178 | so manually keep AC97 reset high */ | |
179 | set_resetgpio_mode(RESETGPIO_FORCE_HIGH); | |
180 | udelay(10); | |
181 | GCR |= GCR_WARM_RST; | |
182 | set_resetgpio_mode(RESETGPIO_NORMAL_ALTFUNC); | |
183 | udelay(500); | |
184 | } | |
185 | ||
186 | static inline void pxa_ac97_cold_pxa27x(void) | |
187 | { | |
188 | GCR &= GCR_COLD_RST; /* clear everything but nCRST */ | |
189 | GCR &= ~GCR_COLD_RST; /* then assert nCRST */ | |
190 | ||
191 | gsr_bits = 0; | |
192 | ||
193 | /* PXA27x Developers Manual section 13.5.2.2.1 */ | |
194 | clk_enable(ac97conf_clk); | |
195 | udelay(5); | |
196 | clk_disable(ac97conf_clk); | |
197 | GCR = GCR_COLD_RST; | |
198 | udelay(50); | |
199 | } | |
200 | #endif | |
201 | ||
202 | #ifdef CONFIG_PXA3xx | |
203 | static inline void pxa_ac97_warm_pxa3xx(void) | |
204 | { | |
205 | int timeout = 100; | |
206 | ||
207 | gsr_bits = 0; | |
208 | ||
209 | /* Can't use interrupts */ | |
210 | GCR |= GCR_WARM_RST; | |
211 | while (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)) && timeout--) | |
212 | mdelay(1); | |
213 | } | |
214 | ||
215 | static inline void pxa_ac97_cold_pxa3xx(void) | |
216 | { | |
217 | int timeout = 1000; | |
218 | ||
219 | /* Hold CLKBPB for 100us */ | |
220 | GCR = 0; | |
221 | GCR = GCR_CLKBPB; | |
222 | udelay(100); | |
223 | GCR = 0; | |
224 | ||
225 | GCR &= GCR_COLD_RST; /* clear everything but nCRST */ | |
226 | GCR &= ~GCR_COLD_RST; /* then assert nCRST */ | |
227 | ||
228 | gsr_bits = 0; | |
229 | ||
230 | /* Can't use interrupts on PXA3xx */ | |
231 | GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN); | |
232 | ||
233 | GCR = GCR_WARM_RST | GCR_COLD_RST; | |
234 | while (!(GSR & (GSR_PCR | GSR_SCR)) && timeout--) | |
235 | mdelay(10); | |
236 | } | |
237 | #endif | |
238 | ||
239 | bool pxa2xx_ac97_try_warm_reset(struct snd_ac97 *ac97) | |
240 | { | |
241 | unsigned long gsr; | |
242 | ||
243 | #ifdef CONFIG_PXA25x | |
244 | if (cpu_is_pxa25x()) | |
245 | pxa_ac97_warm_pxa25x(); | |
246 | else | |
247 | #endif | |
248 | #ifdef CONFIG_PXA27x | |
249 | if (cpu_is_pxa27x()) | |
250 | pxa_ac97_warm_pxa27x(); | |
251 | else | |
252 | #endif | |
253 | #ifdef CONFIG_PXA3xx | |
254 | if (cpu_is_pxa3xx()) | |
255 | pxa_ac97_warm_pxa3xx(); | |
256 | else | |
257 | #endif | |
258 | BUG(); | |
259 | gsr = GSR | gsr_bits; | |
260 | if (!(gsr & (GSR_PCR | GSR_SCR))) { | |
261 | printk(KERN_INFO "%s: warm reset timeout (GSR=%#lx)\n", | |
262 | __func__, gsr); | |
263 | ||
264 | return false; | |
265 | } | |
266 | ||
267 | return true; | |
268 | } | |
269 | EXPORT_SYMBOL_GPL(pxa2xx_ac97_try_warm_reset); | |
270 | ||
271 | bool pxa2xx_ac97_try_cold_reset(struct snd_ac97 *ac97) | |
272 | { | |
273 | unsigned long gsr; | |
274 | ||
275 | #ifdef CONFIG_PXA25x | |
276 | if (cpu_is_pxa25x()) | |
277 | pxa_ac97_cold_pxa25x(); | |
278 | else | |
279 | #endif | |
280 | #ifdef CONFIG_PXA27x | |
281 | if (cpu_is_pxa27x()) | |
282 | pxa_ac97_cold_pxa27x(); | |
283 | else | |
284 | #endif | |
285 | #ifdef CONFIG_PXA3xx | |
286 | if (cpu_is_pxa3xx()) | |
287 | pxa_ac97_cold_pxa3xx(); | |
288 | else | |
289 | #endif | |
290 | BUG(); | |
291 | ||
292 | gsr = GSR | gsr_bits; | |
293 | if (!(gsr & (GSR_PCR | GSR_SCR))) { | |
294 | printk(KERN_INFO "%s: cold reset timeout (GSR=%#lx)\n", | |
295 | __func__, gsr); | |
296 | ||
297 | return false; | |
298 | } | |
299 | ||
300 | return true; | |
301 | } | |
302 | EXPORT_SYMBOL_GPL(pxa2xx_ac97_try_cold_reset); | |
303 | ||
304 | ||
305 | void pxa2xx_ac97_finish_reset(struct snd_ac97 *ac97) | |
306 | { | |
307 | GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN); | |
308 | GCR |= GCR_SDONE_IE|GCR_CDONE_IE; | |
309 | } | |
310 | EXPORT_SYMBOL_GPL(pxa2xx_ac97_finish_reset); | |
311 | ||
312 | static irqreturn_t pxa2xx_ac97_irq(int irq, void *dev_id) | |
313 | { | |
314 | long status; | |
315 | ||
316 | status = GSR; | |
317 | if (status) { | |
318 | GSR = status; | |
319 | gsr_bits |= status; | |
320 | wake_up(&gsr_wq); | |
321 | ||
322 | /* Although we don't use those we still need to clear them | |
323 | since they tend to spuriously trigger when MMC is used | |
324 | (hardware bug? go figure)... */ | |
325 | if (cpu_is_pxa27x()) { | |
326 | MISR = MISR_EOC; | |
327 | PISR = PISR_EOC; | |
328 | MCSR = MCSR_EOC; | |
329 | } | |
330 | ||
331 | return IRQ_HANDLED; | |
332 | } | |
333 | ||
334 | return IRQ_NONE; | |
335 | } | |
336 | ||
337 | #ifdef CONFIG_PM | |
338 | int pxa2xx_ac97_hw_suspend(void) | |
339 | { | |
340 | GCR |= GCR_ACLINK_OFF; | |
341 | clk_disable(ac97_clk); | |
342 | return 0; | |
343 | } | |
344 | EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_suspend); | |
345 | ||
346 | int pxa2xx_ac97_hw_resume(void) | |
347 | { | |
348 | clk_enable(ac97_clk); | |
349 | return 0; | |
350 | } | |
351 | EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_resume); | |
352 | #endif | |
353 | ||
354 | int __devinit pxa2xx_ac97_hw_probe(struct platform_device *dev) | |
355 | { | |
356 | int ret; | |
357 | pxa2xx_audio_ops_t *pdata = dev->dev.platform_data; | |
358 | ||
359 | if (pdata) { | |
360 | switch (pdata->reset_gpio) { | |
361 | case 95: | |
362 | case 113: | |
363 | reset_gpio = pdata->reset_gpio; | |
364 | break; | |
365 | case 0: | |
366 | reset_gpio = 113; | |
367 | break; | |
368 | case -1: | |
369 | break; | |
370 | default: | |
371 | dev_err(&dev->dev, "Invalid reset GPIO %d\n", | |
372 | pdata->reset_gpio); | |
373 | } | |
374 | } else { | |
375 | if (cpu_is_pxa27x()) | |
376 | reset_gpio = 113; | |
377 | } | |
378 | ||
379 | if (cpu_is_pxa25x() || cpu_is_pxa27x()) { | |
380 | pxa_gpio_mode(GPIO31_SYNC_AC97_MD); | |
381 | pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD); | |
382 | pxa_gpio_mode(GPIO28_BITCLK_AC97_MD); | |
383 | pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD); | |
384 | } | |
385 | ||
386 | if (cpu_is_pxa27x()) { | |
387 | /* Use GPIO 113 as AC97 Reset on Bulverde */ | |
388 | set_resetgpio_mode(RESETGPIO_NORMAL_ALTFUNC); | |
389 | ac97conf_clk = clk_get(&dev->dev, "AC97CONFCLK"); | |
390 | if (IS_ERR(ac97conf_clk)) { | |
391 | ret = PTR_ERR(ac97conf_clk); | |
392 | ac97conf_clk = NULL; | |
393 | goto err_conf; | |
394 | } | |
395 | } | |
396 | ||
397 | ac97_clk = clk_get(&dev->dev, "AC97CLK"); | |
398 | if (IS_ERR(ac97_clk)) { | |
399 | ret = PTR_ERR(ac97_clk); | |
400 | ac97_clk = NULL; | |
401 | goto err_clk; | |
402 | } | |
403 | ||
404 | ret = clk_enable(ac97_clk); | |
405 | if (ret) | |
406 | goto err_clk2; | |
407 | ||
408 | ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, IRQF_DISABLED, "AC97", NULL); | |
409 | if (ret < 0) | |
410 | goto err_irq; | |
411 | ||
412 | return 0; | |
413 | ||
414 | err_irq: | |
415 | GCR |= GCR_ACLINK_OFF; | |
416 | err_clk2: | |
417 | clk_put(ac97_clk); | |
418 | ac97_clk = NULL; | |
419 | err_clk: | |
420 | if (ac97conf_clk) { | |
421 | clk_put(ac97conf_clk); | |
422 | ac97conf_clk = NULL; | |
423 | } | |
424 | err_conf: | |
425 | return ret; | |
426 | } | |
427 | EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_probe); | |
428 | ||
429 | void pxa2xx_ac97_hw_remove(struct platform_device *dev) | |
430 | { | |
431 | GCR |= GCR_ACLINK_OFF; | |
432 | free_irq(IRQ_AC97, NULL); | |
433 | if (ac97conf_clk) { | |
434 | clk_put(ac97conf_clk); | |
435 | ac97conf_clk = NULL; | |
436 | } | |
437 | clk_disable(ac97_clk); | |
438 | clk_put(ac97_clk); | |
439 | ac97_clk = NULL; | |
440 | } | |
441 | EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_remove); | |
442 | ||
443 | MODULE_AUTHOR("Nicolas Pitre"); | |
444 | MODULE_DESCRIPTION("Intel/Marvell PXA sound library"); | |
445 | MODULE_LICENSE("GPL"); | |
446 |