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/regs-ac97.h>
25 #include <mach/pxa2xx-gpio.h>
26 #include <mach/audio.h>
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;
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).
48 RESETGPIO_NORMAL_ALTFUNC
52 * set_resetgpio_mode - computes and sets the AC97_RESET gpio mode on PXA
53 * @mode: chosen action
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.
60 static void set_resetgpio_mode(int resetgpio_action)
65 switch (resetgpio_action) {
66 case RESETGPIO_NORMAL_ALTFUNC:
67 if (reset_gpio == 113)
68 mode = 113 | GPIO_OUT | GPIO_DFLT_LOW;
70 mode = 95 | GPIO_ALT_FN_1_OUT;
72 case RESETGPIO_FORCE_LOW:
73 mode = reset_gpio | GPIO_OUT | GPIO_DFLT_LOW;
75 case RESETGPIO_FORCE_HIGH:
76 mode = reset_gpio | GPIO_OUT | GPIO_DFLT_HIGH;
84 unsigned short pxa2xx_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
86 unsigned short val = -1;
87 volatile u32 *reg_addr;
89 mutex_lock(&car_mutex);
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;
95 reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
96 reg_addr += (reg >> 1);
98 /* start read access across the ac97 link */
99 GSR = GSR_CDONE | GSR_SDONE;
102 if (reg == AC97_GPIO_STATUS)
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);
113 GSR = GSR_CDONE | GSR_SDONE;
116 /* but we've just started another cycle... */
117 wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1);
119 out: mutex_unlock(&car_mutex);
122 EXPORT_SYMBOL_GPL(pxa2xx_ac97_read);
124 void pxa2xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
127 volatile u32 *reg_addr;
129 mutex_lock(&car_mutex);
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;
135 reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
136 reg_addr += (reg >> 1);
138 GSR = GSR_CDONE | GSR_SDONE;
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);
146 mutex_unlock(&car_mutex);
148 EXPORT_SYMBOL_GPL(pxa2xx_ac97_write);
151 static inline void pxa_ac97_warm_pxa25x(void)
155 GCR |= GCR_WARM_RST | GCR_PRIRDY_IEN | GCR_SECRDY_IEN;
156 wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
159 static inline void pxa_ac97_cold_pxa25x(void)
161 GCR &= GCR_COLD_RST; /* clear everything but nCRST */
162 GCR &= ~GCR_COLD_RST; /* then assert nCRST */
167 GCR |= GCR_CDONE_IE|GCR_SDONE_IE;
168 wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
173 static inline void pxa_ac97_warm_pxa27x(void)
177 /* warm reset broken on Bulverde,
178 so manually keep AC97 reset high */
179 set_resetgpio_mode(RESETGPIO_FORCE_HIGH);
182 set_resetgpio_mode(RESETGPIO_NORMAL_ALTFUNC);
186 static inline void pxa_ac97_cold_pxa27x(void)
188 GCR &= GCR_COLD_RST; /* clear everything but nCRST */
189 GCR &= ~GCR_COLD_RST; /* then assert nCRST */
193 /* PXA27x Developers Manual section 13.5.2.2.1 */
194 clk_enable(ac97conf_clk);
196 clk_disable(ac97conf_clk);
203 static inline void pxa_ac97_warm_pxa3xx(void)
209 /* Can't use interrupts */
211 while (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)) && timeout--)
215 static inline void pxa_ac97_cold_pxa3xx(void)
219 /* Hold CLKBPB for 100us */
225 GCR &= GCR_COLD_RST; /* clear everything but nCRST */
226 GCR &= ~GCR_COLD_RST; /* then assert nCRST */
230 /* Can't use interrupts on PXA3xx */
231 GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
233 GCR = GCR_WARM_RST | GCR_COLD_RST;
234 while (!(GSR & (GSR_PCR | GSR_SCR)) && timeout--)
239 bool pxa2xx_ac97_try_warm_reset(struct snd_ac97 *ac97)
243 pxa_ac97_warm_pxa25x();
248 pxa_ac97_warm_pxa27x();
253 pxa_ac97_warm_pxa3xx();
258 if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR))) {
259 printk(KERN_INFO "%s: warm reset timeout (GSR=%#lx)\n",
267 EXPORT_SYMBOL_GPL(pxa2xx_ac97_try_warm_reset);
269 bool pxa2xx_ac97_try_cold_reset(struct snd_ac97 *ac97)
273 pxa_ac97_cold_pxa25x();
278 pxa_ac97_cold_pxa27x();
283 pxa_ac97_cold_pxa3xx();
288 if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR))) {
289 printk(KERN_INFO "%s: cold reset timeout (GSR=%#lx)\n",
297 EXPORT_SYMBOL_GPL(pxa2xx_ac97_try_cold_reset);
300 void pxa2xx_ac97_finish_reset(struct snd_ac97 *ac97)
302 GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
303 GCR |= GCR_SDONE_IE|GCR_CDONE_IE;
305 EXPORT_SYMBOL_GPL(pxa2xx_ac97_finish_reset);
307 static irqreturn_t pxa2xx_ac97_irq(int irq, void *dev_id)
317 /* Although we don't use those we still need to clear them
318 since they tend to spuriously trigger when MMC is used
319 (hardware bug? go figure)... */
320 if (cpu_is_pxa27x()) {
333 int pxa2xx_ac97_hw_suspend(void)
335 GCR |= GCR_ACLINK_OFF;
336 clk_disable(ac97_clk);
339 EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_suspend);
341 int pxa2xx_ac97_hw_resume(void)
343 if (cpu_is_pxa25x() || cpu_is_pxa27x()) {
344 pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
345 pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
346 pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
347 pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
349 if (cpu_is_pxa27x()) {
350 /* Use GPIO 113 or 95 as AC97 Reset on Bulverde */
351 set_resetgpio_mode(RESETGPIO_NORMAL_ALTFUNC);
353 clk_enable(ac97_clk);
356 EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_resume);
359 int __devinit pxa2xx_ac97_hw_probe(struct platform_device *dev)
362 struct pxa2xx_ac97_platform_data *pdata = dev->dev.platform_data;
365 switch (pdata->reset_gpio) {
368 reset_gpio = pdata->reset_gpio;
376 dev_err(&dev->dev, "Invalid reset GPIO %d\n",
384 if (cpu_is_pxa25x() || cpu_is_pxa27x()) {
385 pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
386 pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
387 pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
388 pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
391 if (cpu_is_pxa27x()) {
392 /* Use GPIO 113 as AC97 Reset on Bulverde */
393 set_resetgpio_mode(RESETGPIO_NORMAL_ALTFUNC);
394 ac97conf_clk = clk_get(&dev->dev, "AC97CONFCLK");
395 if (IS_ERR(ac97conf_clk)) {
396 ret = PTR_ERR(ac97conf_clk);
402 ac97_clk = clk_get(&dev->dev, "AC97CLK");
403 if (IS_ERR(ac97_clk)) {
404 ret = PTR_ERR(ac97_clk);
409 ret = clk_enable(ac97_clk);
413 ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, IRQF_DISABLED, "AC97", NULL);
420 GCR |= GCR_ACLINK_OFF;
426 clk_put(ac97conf_clk);
432 EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_probe);
434 void pxa2xx_ac97_hw_remove(struct platform_device *dev)
436 GCR |= GCR_ACLINK_OFF;
437 free_irq(IRQ_AC97, NULL);
439 clk_put(ac97conf_clk);
442 clk_disable(ac97_clk);
446 EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_remove);
448 MODULE_AUTHOR("Nicolas Pitre");
449 MODULE_DESCRIPTION("Intel/Marvell PXA sound library");
450 MODULE_LICENSE("GPL");