| /* |
| * linux/sound/pxa2xx-ac97.c -- AC97 support for the Intel PXA2xx chip. |
| * |
| * Author: Nicolas Pitre |
| * Created: Dec 02, 2004 |
| * Copyright: MontaVista Software Inc. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/platform_device.h> |
| #include <linux/interrupt.h> |
| #include <linux/wait.h> |
| #include <linux/clk.h> |
| #include <linux/delay.h> |
| |
| #include <sound/core.h> |
| #include <sound/pcm.h> |
| #include <sound/ac97_codec.h> |
| #include <sound/initval.h> |
| |
| #include <asm/irq.h> |
| #include <linux/mutex.h> |
| #include <mach/hardware.h> |
| #include <mach/pxa-regs.h> |
| #include <mach/pxa2xx-gpio.h> |
| #include <mach/audio.h> |
| |
| #include "pxa2xx-pcm.h" |
| |
| |
| static DEFINE_MUTEX(car_mutex); |
| static DECLARE_WAIT_QUEUE_HEAD(gsr_wq); |
| static volatile long gsr_bits; |
| static struct clk *ac97_clk; |
| #ifdef CONFIG_PXA27x |
| static struct clk *ac97conf_clk; |
| #endif |
| |
| /* |
| * Beware PXA27x bugs: |
| * |
| * o Slot 12 read from modem space will hang controller. |
| * o CDONE, SDONE interrupt fails after any slot 12 IO. |
| * |
| * We therefore have an hybrid approach for waiting on SDONE (interrupt or |
| * 1 jiffy timeout if interrupt never comes). |
| */ |
| |
| static unsigned short pxa2xx_ac97_read(struct snd_ac97 *ac97, unsigned short reg) |
| { |
| unsigned short val = -1; |
| volatile u32 *reg_addr; |
| |
| mutex_lock(&car_mutex); |
| |
| /* set up primary or secondary codec space */ |
| reg_addr = (ac97->num & 1) ? &SAC_REG_BASE : &PAC_REG_BASE; |
| reg_addr += (reg >> 1); |
| |
| /* start read access across the ac97 link */ |
| GSR = GSR_CDONE | GSR_SDONE; |
| gsr_bits = 0; |
| val = *reg_addr; |
| if (reg == AC97_GPIO_STATUS) |
| goto out; |
| if (wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1) <= 0 && |
| !((GSR | gsr_bits) & GSR_SDONE)) { |
| printk(KERN_ERR "%s: read error (ac97_reg=%d GSR=%#lx)\n", |
| __func__, reg, GSR | gsr_bits); |
| val = -1; |
| goto out; |
| } |
| |
| /* valid data now */ |
| GSR = GSR_CDONE | GSR_SDONE; |
| gsr_bits = 0; |
| val = *reg_addr; |
| /* but we've just started another cycle... */ |
| wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1); |
| |
| out: mutex_unlock(&car_mutex); |
| return val; |
| } |
| |
| static void pxa2xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val) |
| { |
| volatile u32 *reg_addr; |
| |
| mutex_lock(&car_mutex); |
| |
| /* set up primary or secondary codec space */ |
| reg_addr = (ac97->num & 1) ? &SAC_REG_BASE : &PAC_REG_BASE; |
| reg_addr += (reg >> 1); |
| |
| GSR = GSR_CDONE | GSR_SDONE; |
| gsr_bits = 0; |
| *reg_addr = val; |
| if (wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_CDONE, 1) <= 0 && |
| !((GSR | gsr_bits) & GSR_CDONE)) |
| printk(KERN_ERR "%s: write error (ac97_reg=%d GSR=%#lx)\n", |
| __func__, reg, GSR | gsr_bits); |
| |
| mutex_unlock(&car_mutex); |
| } |
| |
| static void pxa2xx_ac97_reset(struct snd_ac97 *ac97) |
| { |
| /* First, try cold reset */ |
| #ifdef CONFIG_PXA3xx |
| int timeout; |
| |
| /* Hold CLKBPB for 100us */ |
| GCR = 0; |
| GCR = GCR_CLKBPB; |
| udelay(100); |
| GCR = 0; |
| #endif |
| |
| GCR &= GCR_COLD_RST; /* clear everything but nCRST */ |
| GCR &= ~GCR_COLD_RST; /* then assert nCRST */ |
| |
| gsr_bits = 0; |
| #ifdef CONFIG_PXA27x |
| /* PXA27x Developers Manual section 13.5.2.2.1 */ |
| clk_enable(ac97conf_clk); |
| udelay(5); |
| clk_disable(ac97conf_clk); |
| GCR = GCR_COLD_RST; |
| udelay(50); |
| #elif defined(CONFIG_PXA3xx) |
| timeout = 1000; |
| /* Can't use interrupts on PXA3xx */ |
| GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN); |
| |
| GCR = GCR_WARM_RST | GCR_COLD_RST; |
| while (!(GSR & (GSR_PCR | GSR_SCR)) && timeout--) |
| mdelay(10); |
| #else |
| GCR = GCR_COLD_RST; |
| GCR |= GCR_CDONE_IE|GCR_SDONE_IE; |
| wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1); |
| #endif |
| |
| if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR))) { |
| printk(KERN_INFO "%s: cold reset timeout (GSR=%#lx)\n", |
| __func__, gsr_bits); |
| |
| /* let's try warm reset */ |
| gsr_bits = 0; |
| #ifdef CONFIG_PXA27x |
| /* warm reset broken on Bulverde, |
| so manually keep AC97 reset high */ |
| pxa_gpio_mode(113 | GPIO_OUT | GPIO_DFLT_HIGH); |
| udelay(10); |
| GCR |= GCR_WARM_RST; |
| pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT); |
| udelay(500); |
| #elif defined(CONFIG_PXA3xx) |
| timeout = 100; |
| /* Can't use interrupts */ |
| GCR |= GCR_WARM_RST; |
| while (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)) && timeout--) |
| mdelay(1); |
| #else |
| GCR |= GCR_WARM_RST|GCR_PRIRDY_IEN|GCR_SECRDY_IEN; |
| wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1); |
| #endif |
| |
| if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR))) |
| printk(KERN_INFO "%s: warm reset timeout (GSR=%#lx)\n", |
| __func__, gsr_bits); |
| } |
| |
| GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN); |
| GCR |= GCR_SDONE_IE|GCR_CDONE_IE; |
| } |
| |
| static irqreturn_t pxa2xx_ac97_irq(int irq, void *dev_id) |
| { |
| long status; |
| |
| status = GSR; |
| if (status) { |
| GSR = status; |
| gsr_bits |= status; |
| wake_up(&gsr_wq); |
| |
| #ifdef CONFIG_PXA27x |
| /* Although we don't use those we still need to clear them |
| since they tend to spuriously trigger when MMC is used |
| (hardware bug? go figure)... */ |
| MISR = MISR_EOC; |
| PISR = PISR_EOC; |
| MCSR = MCSR_EOC; |
| #endif |
| |
| return IRQ_HANDLED; |
| } |
| |
| return IRQ_NONE; |
| } |
| |
| static struct snd_ac97_bus_ops pxa2xx_ac97_ops = { |
| .read = pxa2xx_ac97_read, |
| .write = pxa2xx_ac97_write, |
| .reset = pxa2xx_ac97_reset, |
| }; |
| |
| static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_out = { |
| .name = "AC97 PCM out", |
| .dev_addr = __PREG(PCDR), |
| .drcmr = &DRCMR(12), |
| .dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG | |
| DCMD_BURST32 | DCMD_WIDTH4, |
| }; |
| |
| static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_in = { |
| .name = "AC97 PCM in", |
| .dev_addr = __PREG(PCDR), |
| .drcmr = &DRCMR(11), |
| .dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC | |
| DCMD_BURST32 | DCMD_WIDTH4, |
| }; |
| |
| static struct snd_pcm *pxa2xx_ac97_pcm; |
| static struct snd_ac97 *pxa2xx_ac97_ac97; |
| |
| static int pxa2xx_ac97_pcm_startup(struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| pxa2xx_audio_ops_t *platform_ops; |
| int r; |
| |
| runtime->hw.channels_min = 2; |
| runtime->hw.channels_max = 2; |
| |
| r = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? |
| AC97_RATES_FRONT_DAC : AC97_RATES_ADC; |
| runtime->hw.rates = pxa2xx_ac97_ac97->rates[r]; |
| snd_pcm_limit_hw_rates(runtime); |
| |
| platform_ops = substream->pcm->card->dev->platform_data; |
| if (platform_ops && platform_ops->startup) |
| return platform_ops->startup(substream, platform_ops->priv); |
| else |
| return 0; |
| } |
| |
| static void pxa2xx_ac97_pcm_shutdown(struct snd_pcm_substream *substream) |
| { |
| pxa2xx_audio_ops_t *platform_ops; |
| |
| platform_ops = substream->pcm->card->dev->platform_data; |
| if (platform_ops && platform_ops->shutdown) |
| platform_ops->shutdown(substream, platform_ops->priv); |
| } |
| |
| static int pxa2xx_ac97_pcm_prepare(struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? |
| AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE; |
| return snd_ac97_set_rate(pxa2xx_ac97_ac97, reg, runtime->rate); |
| } |
| |
| static struct pxa2xx_pcm_client pxa2xx_ac97_pcm_client = { |
| .playback_params = &pxa2xx_ac97_pcm_out, |
| .capture_params = &pxa2xx_ac97_pcm_in, |
| .startup = pxa2xx_ac97_pcm_startup, |
| .shutdown = pxa2xx_ac97_pcm_shutdown, |
| .prepare = pxa2xx_ac97_pcm_prepare, |
| }; |
| |
| #ifdef CONFIG_PM |
| |
| static int pxa2xx_ac97_do_suspend(struct snd_card *card, pm_message_t state) |
| { |
| pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data; |
| |
| snd_power_change_state(card, SNDRV_CTL_POWER_D3cold); |
| snd_pcm_suspend_all(pxa2xx_ac97_pcm); |
| snd_ac97_suspend(pxa2xx_ac97_ac97); |
| if (platform_ops && platform_ops->suspend) |
| platform_ops->suspend(platform_ops->priv); |
| GCR |= GCR_ACLINK_OFF; |
| clk_disable(ac97_clk); |
| |
| return 0; |
| } |
| |
| static int pxa2xx_ac97_do_resume(struct snd_card *card) |
| { |
| pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data; |
| |
| clk_enable(ac97_clk); |
| if (platform_ops && platform_ops->resume) |
| platform_ops->resume(platform_ops->priv); |
| snd_ac97_resume(pxa2xx_ac97_ac97); |
| snd_power_change_state(card, SNDRV_CTL_POWER_D0); |
| |
| return 0; |
| } |
| |
| static int pxa2xx_ac97_suspend(struct platform_device *dev, pm_message_t state) |
| { |
| struct snd_card *card = platform_get_drvdata(dev); |
| int ret = 0; |
| |
| if (card) |
| ret = pxa2xx_ac97_do_suspend(card, PMSG_SUSPEND); |
| |
| return ret; |
| } |
| |
| static int pxa2xx_ac97_resume(struct platform_device *dev) |
| { |
| struct snd_card *card = platform_get_drvdata(dev); |
| int ret = 0; |
| |
| if (card) |
| ret = pxa2xx_ac97_do_resume(card); |
| |
| return ret; |
| } |
| |
| #else |
| #define pxa2xx_ac97_suspend NULL |
| #define pxa2xx_ac97_resume NULL |
| #endif |
| |
| static int __devinit pxa2xx_ac97_probe(struct platform_device *dev) |
| { |
| struct snd_card *card; |
| struct snd_ac97_bus *ac97_bus; |
| struct snd_ac97_template ac97_template; |
| int ret; |
| |
| ret = -ENOMEM; |
| card = snd_card_new(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1, |
| THIS_MODULE, 0); |
| if (!card) |
| goto err; |
| |
| card->dev = &dev->dev; |
| strncpy(card->driver, dev->dev.driver->name, sizeof(card->driver)); |
| |
| ret = pxa2xx_pcm_new(card, &pxa2xx_ac97_pcm_client, &pxa2xx_ac97_pcm); |
| if (ret) |
| goto err; |
| |
| ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, 0, "AC97", NULL); |
| if (ret < 0) |
| goto err; |
| |
| 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); |
| #ifdef CONFIG_PXA27x |
| /* Use GPIO 113 as AC97 Reset on Bulverde */ |
| pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT); |
| ac97conf_clk = clk_get(&dev->dev, "AC97CONFCLK"); |
| if (IS_ERR(ac97conf_clk)) { |
| ret = PTR_ERR(ac97conf_clk); |
| ac97conf_clk = NULL; |
| goto err; |
| } |
| #endif |
| |
| ac97_clk = clk_get(&dev->dev, "AC97CLK"); |
| if (IS_ERR(ac97_clk)) { |
| ret = PTR_ERR(ac97_clk); |
| ac97_clk = NULL; |
| goto err; |
| } |
| clk_enable(ac97_clk); |
| |
| ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus); |
| if (ret) |
| goto err; |
| memset(&ac97_template, 0, sizeof(ac97_template)); |
| ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97); |
| if (ret) |
| goto err; |
| |
| snprintf(card->shortname, sizeof(card->shortname), |
| "%s", snd_ac97_get_short_name(pxa2xx_ac97_ac97)); |
| snprintf(card->longname, sizeof(card->longname), |
| "%s (%s)", dev->dev.driver->name, card->mixername); |
| |
| snd_card_set_dev(card, &dev->dev); |
| ret = snd_card_register(card); |
| if (ret == 0) { |
| platform_set_drvdata(dev, card); |
| return 0; |
| } |
| |
| err: |
| if (card) |
| snd_card_free(card); |
| if (ac97_clk) { |
| GCR |= GCR_ACLINK_OFF; |
| free_irq(IRQ_AC97, NULL); |
| clk_disable(ac97_clk); |
| clk_put(ac97_clk); |
| ac97_clk = NULL; |
| } |
| #ifdef CONFIG_PXA27x |
| if (ac97conf_clk) { |
| clk_put(ac97conf_clk); |
| ac97conf_clk = NULL; |
| } |
| #endif |
| return ret; |
| } |
| |
| static int __devexit pxa2xx_ac97_remove(struct platform_device *dev) |
| { |
| struct snd_card *card = platform_get_drvdata(dev); |
| |
| if (card) { |
| snd_card_free(card); |
| platform_set_drvdata(dev, NULL); |
| GCR |= GCR_ACLINK_OFF; |
| free_irq(IRQ_AC97, NULL); |
| clk_disable(ac97_clk); |
| clk_put(ac97_clk); |
| ac97_clk = NULL; |
| #ifdef CONFIG_PXA27x |
| clk_put(ac97conf_clk); |
| ac97conf_clk = NULL; |
| #endif |
| } |
| |
| return 0; |
| } |
| |
| static struct platform_driver pxa2xx_ac97_driver = { |
| .probe = pxa2xx_ac97_probe, |
| .remove = __devexit_p(pxa2xx_ac97_remove), |
| .suspend = pxa2xx_ac97_suspend, |
| .resume = pxa2xx_ac97_resume, |
| .driver = { |
| .name = "pxa2xx-ac97", |
| .owner = THIS_MODULE, |
| }, |
| }; |
| |
| static int __init pxa2xx_ac97_init(void) |
| { |
| return platform_driver_register(&pxa2xx_ac97_driver); |
| } |
| |
| static void __exit pxa2xx_ac97_exit(void) |
| { |
| platform_driver_unregister(&pxa2xx_ac97_driver); |
| } |
| |
| module_init(pxa2xx_ac97_init); |
| module_exit(pxa2xx_ac97_exit); |
| |
| MODULE_AUTHOR("Nicolas Pitre"); |
| MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("platform:pxa2xx-ac97"); |