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;
34 static int reset_gpio;
39 * o Slot 12 read from modem space will hang controller.
40 * o CDONE, SDONE interrupt fails after any slot 12 IO.
42 * We therefore have an hybrid approach for waiting on SDONE (interrupt or
43 * 1 jiffy timeout if interrupt never comes).
49 RESETGPIO_NORMAL_ALTFUNC
53 * set_resetgpio_mode - computes and sets the AC97_RESET gpio mode on PXA
54 * @mode: chosen action
56 * As the PXA27x CPUs suffer from a AC97 bug, a manual control of the reset line
57 * must be done to insure proper work of AC97 reset line. This function
58 * computes the correct gpio_mode for further use by reset functions, and
59 * applied the change through pxa_gpio_mode.
61 static void set_resetgpio_mode(int resetgpio_action)
66 switch (resetgpio_action) {
67 case RESETGPIO_NORMAL_ALTFUNC:
68 if (reset_gpio == 113)
69 mode = 113 | GPIO_OUT | GPIO_DFLT_LOW;
71 mode = 95 | GPIO_ALT_FN_1_OUT;
73 case RESETGPIO_FORCE_LOW:
74 mode = reset_gpio | GPIO_OUT | GPIO_DFLT_LOW;
76 case RESETGPIO_FORCE_HIGH:
77 mode = reset_gpio | GPIO_OUT | GPIO_DFLT_HIGH;
85 unsigned short pxa2xx_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
87 unsigned short val = -1;
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 /* start read access across the ac97 link */
100 GSR = GSR_CDONE | GSR_SDONE;
103 if (reg == AC97_GPIO_STATUS)
105 if (wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1) <= 0 &&
106 !((GSR | gsr_bits) & GSR_SDONE)) {
107 printk(KERN_ERR "%s: read error (ac97_reg=%d GSR=%#lx)\n",
108 __func__, reg, GSR | gsr_bits);
114 GSR = GSR_CDONE | GSR_SDONE;
117 /* but we've just started another cycle... */
118 wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1);
120 out: mutex_unlock(&car_mutex);
123 EXPORT_SYMBOL_GPL(pxa2xx_ac97_read);
125 void pxa2xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
128 volatile u32 *reg_addr;
130 mutex_lock(&car_mutex);
132 /* set up primary or secondary codec space */
133 if (cpu_is_pxa25x() && reg == AC97_GPIO_STATUS)
134 reg_addr = ac97->num ? &SMC_REG_BASE : &PMC_REG_BASE;
136 reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
137 reg_addr += (reg >> 1);
139 GSR = GSR_CDONE | GSR_SDONE;
142 if (wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_CDONE, 1) <= 0 &&
143 !((GSR | gsr_bits) & GSR_CDONE))
144 printk(KERN_ERR "%s: write error (ac97_reg=%d GSR=%#lx)\n",
145 __func__, reg, GSR | gsr_bits);
147 mutex_unlock(&car_mutex);
149 EXPORT_SYMBOL_GPL(pxa2xx_ac97_write);
152 static inline void pxa_ac97_warm_pxa25x(void)
156 GCR |= GCR_WARM_RST | GCR_PRIRDY_IEN | GCR_SECRDY_IEN;
157 wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
160 static inline void pxa_ac97_cold_pxa25x(void)
162 GCR &= GCR_COLD_RST; /* clear everything but nCRST */
163 GCR &= ~GCR_COLD_RST; /* then assert nCRST */
168 GCR |= GCR_CDONE_IE|GCR_SDONE_IE;
169 wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
174 static inline void pxa_ac97_warm_pxa27x(void)
178 /* warm reset broken on Bulverde,
179 so manually keep AC97 reset high */
180 set_resetgpio_mode(RESETGPIO_FORCE_HIGH);
183 set_resetgpio_mode(RESETGPIO_NORMAL_ALTFUNC);
187 static inline void pxa_ac97_cold_pxa27x(void)
189 GCR &= GCR_COLD_RST; /* clear everything but nCRST */
190 GCR &= ~GCR_COLD_RST; /* then assert nCRST */
194 /* PXA27x Developers Manual section 13.5.2.2.1 */
195 clk_enable(ac97conf_clk);
197 clk_disable(ac97conf_clk);
204 static inline void pxa_ac97_warm_pxa3xx(void)
210 /* Can't use interrupts */
212 while (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)) && timeout--)
216 static inline void pxa_ac97_cold_pxa3xx(void)
220 /* Hold CLKBPB for 100us */
226 GCR &= GCR_COLD_RST; /* clear everything but nCRST */
227 GCR &= ~GCR_COLD_RST; /* then assert nCRST */
231 /* Can't use interrupts on PXA3xx */
232 GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
234 GCR = GCR_WARM_RST | GCR_COLD_RST;
235 while (!(GSR & (GSR_PCR | GSR_SCR)) && timeout--)
240 bool pxa2xx_ac97_try_warm_reset(struct snd_ac97 *ac97)
244 pxa_ac97_warm_pxa25x();
249 pxa_ac97_warm_pxa27x();
254 pxa_ac97_warm_pxa3xx();
259 if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR))) {
260 printk(KERN_INFO "%s: warm reset timeout (GSR=%#lx)\n",
268 EXPORT_SYMBOL_GPL(pxa2xx_ac97_try_warm_reset);
270 bool pxa2xx_ac97_try_cold_reset(struct snd_ac97 *ac97)
274 pxa_ac97_cold_pxa25x();
279 pxa_ac97_cold_pxa27x();
284 pxa_ac97_cold_pxa3xx();
289 if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR))) {
290 printk(KERN_INFO "%s: cold reset timeout (GSR=%#lx)\n",
298 EXPORT_SYMBOL_GPL(pxa2xx_ac97_try_cold_reset);
301 void pxa2xx_ac97_finish_reset(struct snd_ac97 *ac97)
303 GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
304 GCR |= GCR_SDONE_IE|GCR_CDONE_IE;
306 EXPORT_SYMBOL_GPL(pxa2xx_ac97_finish_reset);
308 static irqreturn_t pxa2xx_ac97_irq(int irq, void *dev_id)
318 /* Although we don't use those we still need to clear them
319 since they tend to spuriously trigger when MMC is used
320 (hardware bug? go figure)... */
321 if (cpu_is_pxa27x()) {
334 int pxa2xx_ac97_hw_suspend(void)
336 GCR |= GCR_ACLINK_OFF;
337 clk_disable(ac97_clk);
340 EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_suspend);
342 int pxa2xx_ac97_hw_resume(void)
344 if (cpu_is_pxa25x() || cpu_is_pxa27x()) {
345 pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
346 pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
347 pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
348 pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
350 if (cpu_is_pxa27x()) {
351 /* Use GPIO 113 or 95 as AC97 Reset on Bulverde */
352 set_resetgpio_mode(RESETGPIO_NORMAL_ALTFUNC);
354 clk_enable(ac97_clk);
357 EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_resume);
360 int __devinit pxa2xx_ac97_hw_probe(struct platform_device *dev)
363 struct pxa2xx_ac97_platform_data *pdata = dev->dev.platform_data;
366 switch (pdata->reset_gpio) {
369 reset_gpio = pdata->reset_gpio;
377 dev_err(&dev->dev, "Invalid reset GPIO %d\n",
385 if (cpu_is_pxa25x() || cpu_is_pxa27x()) {
386 pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
387 pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
388 pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
389 pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
392 if (cpu_is_pxa27x()) {
393 /* Use GPIO 113 as AC97 Reset on Bulverde */
394 set_resetgpio_mode(RESETGPIO_NORMAL_ALTFUNC);
395 ac97conf_clk = clk_get(&dev->dev, "AC97CONFCLK");
396 if (IS_ERR(ac97conf_clk)) {
397 ret = PTR_ERR(ac97conf_clk);
403 ac97_clk = clk_get(&dev->dev, "AC97CLK");
404 if (IS_ERR(ac97_clk)) {
405 ret = PTR_ERR(ac97_clk);
410 ret = clk_enable(ac97_clk);
414 ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, IRQF_DISABLED, "AC97", NULL);
421 GCR |= GCR_ACLINK_OFF;
427 clk_put(ac97conf_clk);
433 EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_probe);
435 void pxa2xx_ac97_hw_remove(struct platform_device *dev)
437 GCR |= GCR_ACLINK_OFF;
438 free_irq(IRQ_AC97, NULL);
440 clk_put(ac97conf_clk);
443 clk_disable(ac97_clk);
447 EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_remove);
449 MODULE_AUTHOR("Nicolas Pitre");
450 MODULE_DESCRIPTION("Intel/Marvell PXA sound library");
451 MODULE_LICENSE("GPL");