2 * Based on sound/arm/pxa2xx-ac97.c and sound/soc/pxa/pxa2xx-ac97.c
5 * Author: Nicolas Pitre
6 * Created: Dec 02, 2004
7 * Copyright: MontaVista Software Inc.
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.
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>
20 #include <sound/ac97_codec.h>
21 #include <sound/pxa2xx-lib.h>
24 #include <mach/hardware.h>
25 #include <mach/regs-ac97.h>
26 #include <mach/pxa2xx-gpio.h>
27 #include <mach/audio.h>
29 static DEFINE_MUTEX(car_mutex);
30 static DECLARE_WAIT_QUEUE_HEAD(gsr_wq);
31 static volatile long gsr_bits;
32 static struct clk *ac97_clk;
33 static struct clk *ac97conf_clk;
38 * o Slot 12 read from modem space will hang controller.
39 * o CDONE, SDONE interrupt fails after any slot 12 IO.
41 * We therefore have an hybrid approach for waiting on SDONE (interrupt or
42 * 1 jiffy timeout if interrupt never comes).
45 unsigned short pxa2xx_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
47 unsigned short val = -1;
48 volatile u32 *reg_addr;
50 mutex_lock(&car_mutex);
52 /* set up primary or secondary codec space */
53 if (cpu_is_pxa25x() && reg == AC97_GPIO_STATUS)
54 reg_addr = ac97->num ? &SMC_REG_BASE : &PMC_REG_BASE;
56 reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
57 reg_addr += (reg >> 1);
59 /* start read access across the ac97 link */
60 GSR = GSR_CDONE | GSR_SDONE;
63 if (reg == AC97_GPIO_STATUS)
65 if (wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1) <= 0 &&
66 !((GSR | gsr_bits) & GSR_SDONE)) {
67 printk(KERN_ERR "%s: read error (ac97_reg=%d GSR=%#lx)\n",
68 __func__, reg, GSR | gsr_bits);
74 GSR = GSR_CDONE | GSR_SDONE;
77 /* but we've just started another cycle... */
78 wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1);
80 out: mutex_unlock(&car_mutex);
83 EXPORT_SYMBOL_GPL(pxa2xx_ac97_read);
85 void pxa2xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
88 volatile u32 *reg_addr;
90 mutex_lock(&car_mutex);
92 /* set up primary or secondary codec space */
93 if (cpu_is_pxa25x() && reg == AC97_GPIO_STATUS)
94 reg_addr = ac97->num ? &SMC_REG_BASE : &PMC_REG_BASE;
96 reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
97 reg_addr += (reg >> 1);
99 GSR = GSR_CDONE | GSR_SDONE;
102 if (wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_CDONE, 1) <= 0 &&
103 !((GSR | gsr_bits) & GSR_CDONE))
104 printk(KERN_ERR "%s: write error (ac97_reg=%d GSR=%#lx)\n",
105 __func__, reg, GSR | gsr_bits);
107 mutex_unlock(&car_mutex);
109 EXPORT_SYMBOL_GPL(pxa2xx_ac97_write);
112 static inline void pxa_ac97_warm_pxa25x(void)
116 GCR |= GCR_WARM_RST | GCR_PRIRDY_IEN | GCR_SECRDY_IEN;
117 wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
120 static inline void pxa_ac97_cold_pxa25x(void)
122 GCR &= GCR_COLD_RST; /* clear everything but nCRST */
123 GCR &= ~GCR_COLD_RST; /* then assert nCRST */
128 GCR |= GCR_CDONE_IE|GCR_SDONE_IE;
129 wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
134 static inline void pxa_ac97_warm_pxa27x(void)
138 /* warm reset broken on Bulverde,
139 so manually keep AC97 reset high */
140 pxa_gpio_mode(113 | GPIO_OUT | GPIO_DFLT_HIGH);
143 pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
147 static inline void pxa_ac97_cold_pxa27x(void)
149 GCR &= GCR_COLD_RST; /* clear everything but nCRST */
150 GCR &= ~GCR_COLD_RST; /* then assert nCRST */
154 /* PXA27x Developers Manual section 13.5.2.2.1 */
155 clk_enable(ac97conf_clk);
157 clk_disable(ac97conf_clk);
164 static inline void pxa_ac97_warm_pxa3xx(void)
170 /* Can't use interrupts */
172 while (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)) && timeout--)
176 static inline void pxa_ac97_cold_pxa3xx(void)
180 /* Hold CLKBPB for 100us */
186 GCR &= GCR_COLD_RST; /* clear everything but nCRST */
187 GCR &= ~GCR_COLD_RST; /* then assert nCRST */
191 /* Can't use interrupts on PXA3xx */
192 GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
194 GCR = GCR_WARM_RST | GCR_COLD_RST;
195 while (!(GSR & (GSR_PCR | GSR_SCR)) && timeout--)
200 bool pxa2xx_ac97_try_warm_reset(struct snd_ac97 *ac97)
204 pxa_ac97_warm_pxa25x();
209 pxa_ac97_warm_pxa27x();
214 pxa_ac97_warm_pxa3xx();
219 if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR))) {
220 printk(KERN_INFO "%s: warm reset timeout (GSR=%#lx)\n",
228 EXPORT_SYMBOL_GPL(pxa2xx_ac97_try_warm_reset);
230 bool pxa2xx_ac97_try_cold_reset(struct snd_ac97 *ac97)
234 pxa_ac97_cold_pxa25x();
239 pxa_ac97_cold_pxa27x();
244 pxa_ac97_cold_pxa3xx();
249 if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR))) {
250 printk(KERN_INFO "%s: cold reset timeout (GSR=%#lx)\n",
258 EXPORT_SYMBOL_GPL(pxa2xx_ac97_try_cold_reset);
261 void pxa2xx_ac97_finish_reset(struct snd_ac97 *ac97)
263 GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
264 GCR |= GCR_SDONE_IE|GCR_CDONE_IE;
266 EXPORT_SYMBOL_GPL(pxa2xx_ac97_finish_reset);
268 static irqreturn_t pxa2xx_ac97_irq(int irq, void *dev_id)
278 /* Although we don't use those we still need to clear them
279 since they tend to spuriously trigger when MMC is used
280 (hardware bug? go figure)... */
281 if (cpu_is_pxa27x()) {
294 int pxa2xx_ac97_hw_suspend(void)
296 GCR |= GCR_ACLINK_OFF;
297 clk_disable(ac97_clk);
300 EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_suspend);
302 int pxa2xx_ac97_hw_resume(void)
304 if (cpu_is_pxa25x() || cpu_is_pxa27x()) {
305 pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
306 pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
307 pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
308 pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
310 if (cpu_is_pxa27x()) {
311 /* Use GPIO 113 as AC97 Reset on Bulverde */
312 pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
314 clk_enable(ac97_clk);
317 EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_resume);
320 int __devinit pxa2xx_ac97_hw_probe(struct platform_device *dev)
324 if (cpu_is_pxa25x() || cpu_is_pxa27x()) {
325 pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
326 pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
327 pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
328 pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
331 if (cpu_is_pxa27x()) {
332 /* Use GPIO 113 as AC97 Reset on Bulverde */
333 pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
334 ac97conf_clk = clk_get(&dev->dev, "AC97CONFCLK");
335 if (IS_ERR(ac97conf_clk)) {
336 ret = PTR_ERR(ac97conf_clk);
342 ac97_clk = clk_get(&dev->dev, "AC97CLK");
343 if (IS_ERR(ac97_clk)) {
344 ret = PTR_ERR(ac97_clk);
349 ret = clk_enable(ac97_clk);
353 ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, IRQF_DISABLED, "AC97", NULL);
360 GCR |= GCR_ACLINK_OFF;
366 clk_put(ac97conf_clk);
372 EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_probe);
374 void pxa2xx_ac97_hw_remove(struct platform_device *dev)
376 GCR |= GCR_ACLINK_OFF;
377 free_irq(IRQ_AC97, NULL);
379 clk_put(ac97conf_clk);
382 clk_disable(ac97_clk);
386 EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_remove);
388 MODULE_AUTHOR("Nicolas Pitre");
389 MODULE_DESCRIPTION("Intel/Marvell PXA sound library");
390 MODULE_LICENSE("GPL");