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Diffstat (limited to 'sound/arm/pxa2xx-ac97-lib.c')
-rw-r--r--sound/arm/pxa2xx-ac97-lib.c123
1 files changed, 41 insertions, 82 deletions
diff --git a/sound/arm/pxa2xx-ac97-lib.c b/sound/arm/pxa2xx-ac97-lib.c
index 6fdca97186e..66de90ed30c 100644
--- a/sound/arm/pxa2xx-ac97-lib.c
+++ b/sound/arm/pxa2xx-ac97-lib.c
@@ -16,13 +16,15 @@
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
#include <sound/ac97_codec.h>
#include <sound/pxa2xx-lib.h>
-#include <asm/irq.h>
+#include <mach/irqs.h>
#include <mach/regs-ac97.h>
-#include <mach/pxa2xx-gpio.h>
#include <mach/audio.h>
static DEFINE_MUTEX(car_mutex);
@@ -32,6 +34,8 @@ static struct clk *ac97_clk;
static struct clk *ac97conf_clk;
static int reset_gpio;
+extern void pxa27x_configure_ac97reset(int reset_gpio, bool to_gpio);
+
/*
* Beware PXA27x bugs:
*
@@ -42,45 +46,6 @@ static int reset_gpio;
* 1 jiffy timeout if interrupt never comes).
*/
-enum {
- RESETGPIO_FORCE_HIGH,
- RESETGPIO_FORCE_LOW,
- RESETGPIO_NORMAL_ALTFUNC
-};
-
-/**
- * set_resetgpio_mode - computes and sets the AC97_RESET gpio mode on PXA
- * @mode: chosen action
- *
- * As the PXA27x CPUs suffer from a AC97 bug, a manual control of the reset line
- * must be done to insure proper work of AC97 reset line. This function
- * computes the correct gpio_mode for further use by reset functions, and
- * applied the change through pxa_gpio_mode.
- */
-static void set_resetgpio_mode(int resetgpio_action)
-{
- int mode = 0;
-
- if (reset_gpio)
- switch (resetgpio_action) {
- case RESETGPIO_NORMAL_ALTFUNC:
- if (reset_gpio == 113)
- mode = 113 | GPIO_ALT_FN_2_OUT;
- if (reset_gpio == 95)
- mode = 95 | GPIO_ALT_FN_1_OUT;
- break;
- case RESETGPIO_FORCE_LOW:
- mode = reset_gpio | GPIO_OUT | GPIO_DFLT_LOW;
- break;
- case RESETGPIO_FORCE_HIGH:
- mode = reset_gpio | GPIO_OUT | GPIO_DFLT_HIGH;
- break;
- };
-
- if (mode)
- pxa_gpio_mode(mode);
-}
-
unsigned short pxa2xx_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
{
unsigned short val = -1;
@@ -152,8 +117,7 @@ static inline void pxa_ac97_warm_pxa25x(void)
{
gsr_bits = 0;
- GCR |= GCR_WARM_RST | GCR_PRIRDY_IEN | GCR_SECRDY_IEN;
- wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
+ GCR |= GCR_WARM_RST;
}
static inline void pxa_ac97_cold_pxa25x(void)
@@ -164,8 +128,6 @@ static inline void pxa_ac97_cold_pxa25x(void)
gsr_bits = 0;
GCR = GCR_COLD_RST;
- GCR |= GCR_CDONE_IE|GCR_SDONE_IE;
- wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
}
#endif
@@ -174,12 +136,11 @@ static inline void pxa_ac97_warm_pxa27x(void)
{
gsr_bits = 0;
- /* warm reset broken on Bulverde,
- so manually keep AC97 reset high */
- set_resetgpio_mode(RESETGPIO_FORCE_HIGH);
+ /* warm reset broken on Bulverde, so manually keep AC97 reset high */
+ pxa27x_configure_ac97reset(reset_gpio, true);
udelay(10);
GCR |= GCR_WARM_RST;
- set_resetgpio_mode(RESETGPIO_NORMAL_ALTFUNC);
+ pxa27x_configure_ac97reset(reset_gpio, false);
udelay(500);
}
@@ -194,28 +155,21 @@ static inline void pxa_ac97_cold_pxa27x(void)
clk_enable(ac97conf_clk);
udelay(5);
clk_disable(ac97conf_clk);
- GCR = GCR_COLD_RST;
- udelay(50);
+ GCR = GCR_COLD_RST | GCR_WARM_RST;
}
#endif
#ifdef CONFIG_PXA3xx
static inline void pxa_ac97_warm_pxa3xx(void)
{
- int timeout = 100;
-
gsr_bits = 0;
/* Can't use interrupts */
GCR |= GCR_WARM_RST;
- while (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)) && timeout--)
- mdelay(1);
}
static inline void pxa_ac97_cold_pxa3xx(void)
{
- int timeout = 1000;
-
/* Hold CLKBPB for 100us */
GCR = 0;
GCR = GCR_CLKBPB;
@@ -231,14 +185,13 @@ static inline void pxa_ac97_cold_pxa3xx(void)
GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
GCR = GCR_WARM_RST | GCR_COLD_RST;
- while (!(GSR & (GSR_PCR | GSR_SCR)) && timeout--)
- mdelay(10);
}
#endif
bool pxa2xx_ac97_try_warm_reset(struct snd_ac97 *ac97)
{
unsigned long gsr;
+ unsigned int timeout = 100;
#ifdef CONFIG_PXA25x
if (cpu_is_pxa25x())
@@ -255,7 +208,11 @@ bool pxa2xx_ac97_try_warm_reset(struct snd_ac97 *ac97)
pxa_ac97_warm_pxa3xx();
else
#endif
- BUG();
+ snd_BUG();
+
+ while (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)) && timeout--)
+ mdelay(1);
+
gsr = GSR | gsr_bits;
if (!(gsr & (GSR_PCR | GSR_SCR))) {
printk(KERN_INFO "%s: warm reset timeout (GSR=%#lx)\n",
@@ -271,6 +228,7 @@ EXPORT_SYMBOL_GPL(pxa2xx_ac97_try_warm_reset);
bool pxa2xx_ac97_try_cold_reset(struct snd_ac97 *ac97)
{
unsigned long gsr;
+ unsigned int timeout = 1000;
#ifdef CONFIG_PXA25x
if (cpu_is_pxa25x())
@@ -287,7 +245,10 @@ bool pxa2xx_ac97_try_cold_reset(struct snd_ac97 *ac97)
pxa_ac97_cold_pxa3xx();
else
#endif
- BUG();
+ snd_BUG();
+
+ while (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)) && timeout--)
+ mdelay(1);
gsr = GSR | gsr_bits;
if (!(gsr & (GSR_PCR | GSR_SCR))) {
@@ -345,23 +306,13 @@ EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_suspend);
int pxa2xx_ac97_hw_resume(void)
{
- if (cpu_is_pxa25x() || cpu_is_pxa27x()) {
- pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
- pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
- pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
- pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
- }
- if (cpu_is_pxa27x()) {
- /* Use GPIO 113 or 95 as AC97 Reset on Bulverde */
- set_resetgpio_mode(RESETGPIO_NORMAL_ALTFUNC);
- }
clk_enable(ac97_clk);
return 0;
}
EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_resume);
#endif
-int __devinit pxa2xx_ac97_hw_probe(struct platform_device *dev)
+int pxa2xx_ac97_hw_probe(struct platform_device *dev)
{
int ret;
pxa2xx_audio_ops_t *pdata = dev->dev.platform_data;
@@ -386,16 +337,22 @@ int __devinit pxa2xx_ac97_hw_probe(struct platform_device *dev)
reset_gpio = 113;
}
- if (cpu_is_pxa25x() || cpu_is_pxa27x()) {
- pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
- pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
- pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
- pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
- }
-
if (cpu_is_pxa27x()) {
- /* Use GPIO 113 as AC97 Reset on Bulverde */
- set_resetgpio_mode(RESETGPIO_NORMAL_ALTFUNC);
+ /*
+ * This gpio is needed for a work-around to a bug in the ac97
+ * controller during warm reset. The direction and level is set
+ * here so that it is an output driven high when switching from
+ * AC97_nRESET alt function to generic gpio.
+ */
+ ret = gpio_request_one(reset_gpio, GPIOF_OUT_INIT_HIGH,
+ "pxa27x ac97 reset");
+ if (ret < 0) {
+ pr_err("%s: gpio_request_one() failed: %d\n",
+ __func__, ret);
+ goto err_conf;
+ }
+ pxa27x_configure_ac97reset(reset_gpio, false);
+
ac97conf_clk = clk_get(&dev->dev, "AC97CONFCLK");
if (IS_ERR(ac97conf_clk)) {
ret = PTR_ERR(ac97conf_clk);
@@ -415,7 +372,7 @@ int __devinit pxa2xx_ac97_hw_probe(struct platform_device *dev)
if (ret)
goto err_clk2;
- ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, IRQF_DISABLED, "AC97", NULL);
+ ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, 0, "AC97", NULL);
if (ret < 0)
goto err_irq;
@@ -438,6 +395,8 @@ EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_probe);
void pxa2xx_ac97_hw_remove(struct platform_device *dev)
{
+ if (cpu_is_pxa27x())
+ gpio_free(reset_gpio);
GCR |= GCR_ACLINK_OFF;
free_irq(IRQ_AC97, NULL);
if (ac97conf_clk) {
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-19 08:45:05 +0000