// SPDX-License-Identifier: GPL-2.0-only /* * Based on sound/arm/pxa2xx-ac97.c and sound/soc/pxa/pxa2xx-ac97.c * which contain: * * Author: Nicolas Pitre * Created: Dec 02, 2004 * Copyright: MontaVista Software Inc. */ #include #include #include #include #include #include #include #include #include #include #include #include #include static DEFINE_MUTEX(car_mutex); static DECLARE_WAIT_QUEUE_HEAD(gsr_wq); static volatile long gsr_bits; 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: * * 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). */ int pxa2xx_ac97_read(int slot, unsigned short reg) { int val = -ENODEV; volatile u32 *reg_addr; if (slot > 0) return -ENODEV; mutex_lock(&car_mutex); /* set up primary or secondary codec space */ if (cpu_is_pxa25x() && reg == AC97_GPIO_STATUS) reg_addr = slot ? &SMC_REG_BASE : &PMC_REG_BASE; else reg_addr = slot ? &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 & 0xffff); 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 = -ETIMEDOUT; goto out; } /* valid data now */ GSR = GSR_CDONE | GSR_SDONE; gsr_bits = 0; val = (*reg_addr & 0xffff); /* 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; } EXPORT_SYMBOL_GPL(pxa2xx_ac97_read); int pxa2xx_ac97_write(int slot, unsigned short reg, unsigned short val) { volatile u32 *reg_addr; int ret = 0; mutex_lock(&car_mutex); /* set up primary or secondary codec space */ if (cpu_is_pxa25x() && reg == AC97_GPIO_STATUS) reg_addr = slot ? &SMC_REG_BASE : &PMC_REG_BASE; else reg_addr = slot ? &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); ret = -EIO; } mutex_unlock(&car_mutex); return ret; } EXPORT_SYMBOL_GPL(pxa2xx_ac97_write); #ifdef CONFIG_PXA25x static inline void pxa_ac97_warm_pxa25x(void) { gsr_bits = 0; GCR |= GCR_WARM_RST; } static inline void pxa_ac97_cold_pxa25x(void) { GCR &= GCR_COLD_RST; /* clear everything but nCRST */ GCR &= ~GCR_COLD_RST; /* then assert nCRST */ gsr_bits = 0; GCR = GCR_COLD_RST; } #endif #ifdef CONFIG_PXA27x static inline void pxa_ac97_warm_pxa27x(void) { gsr_bits = 0; /* warm reset broken on Bulverde, so manually keep AC97 reset high */ pxa27x_configure_ac97reset(reset_gpio, true); udelay(10); GCR |= GCR_WARM_RST; pxa27x_configure_ac97reset(reset_gpio, false); udelay(500); } static inline void pxa_ac97_cold_pxa27x(void) { GCR &= GCR_COLD_RST; /* clear everything but nCRST */ GCR &= ~GCR_COLD_RST; /* then assert nCRST */ gsr_bits = 0; /* PXA27x Developers Manual section 13.5.2.2.1 */ clk_prepare_enable(ac97conf_clk); udelay(5); clk_disable_unprepare(ac97conf_clk); GCR = GCR_COLD_RST | GCR_WARM_RST; } #endif #ifdef CONFIG_PXA3xx static inline void pxa_ac97_warm_pxa3xx(void) { gsr_bits = 0; /* Can't use interrupts */ GCR |= GCR_WARM_RST; } static inline void pxa_ac97_cold_pxa3xx(void) { /* Hold CLKBPB for 100us */ GCR = 0; GCR = GCR_CLKBPB; udelay(100); GCR = 0; GCR &= GCR_COLD_RST; /* clear everything but nCRST */ GCR &= ~GCR_COLD_RST; /* then assert nCRST */ gsr_bits = 0; /* Can't use interrupts on PXA3xx */ GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN); GCR = GCR_WARM_RST | GCR_COLD_RST; } #endif bool pxa2xx_ac97_try_warm_reset(void) { unsigned long gsr; unsigned int timeout = 100; #ifdef CONFIG_PXA25x if (cpu_is_pxa25x()) pxa_ac97_warm_pxa25x(); else #endif #ifdef CONFIG_PXA27x if (cpu_is_pxa27x()) pxa_ac97_warm_pxa27x(); else #endif #ifdef CONFIG_PXA3xx if (cpu_is_pxa3xx()) pxa_ac97_warm_pxa3xx(); else #endif 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", __func__, gsr); return false; } return true; } EXPORT_SYMBOL_GPL(pxa2xx_ac97_try_warm_reset); bool pxa2xx_ac97_try_cold_reset(void) { unsigned long gsr; unsigned int timeout = 1000; #ifdef CONFIG_PXA25x if (cpu_is_pxa25x()) pxa_ac97_cold_pxa25x(); else #endif #ifdef CONFIG_PXA27x if (cpu_is_pxa27x()) pxa_ac97_cold_pxa27x(); else #endif #ifdef CONFIG_PXA3xx if (cpu_is_pxa3xx()) pxa_ac97_cold_pxa3xx(); else #endif 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: cold reset timeout (GSR=%#lx)\n", __func__, gsr); return false; } return true; } EXPORT_SYMBOL_GPL(pxa2xx_ac97_try_cold_reset); void pxa2xx_ac97_finish_reset(void) { GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN); GCR |= GCR_SDONE_IE|GCR_CDONE_IE; } EXPORT_SYMBOL_GPL(pxa2xx_ac97_finish_reset); 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); /* 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)... */ if (cpu_is_pxa27x()) { MISR = MISR_EOC; PISR = PISR_EOC; MCSR = MCSR_EOC; } return IRQ_HANDLED; } return IRQ_NONE; } #ifdef CONFIG_PM int pxa2xx_ac97_hw_suspend(void) { GCR |= GCR_ACLINK_OFF; clk_disable_unprepare(ac97_clk); return 0; } EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_suspend); int pxa2xx_ac97_hw_resume(void) { clk_prepare_enable(ac97_clk); return 0; } EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_resume); #endif int pxa2xx_ac97_hw_probe(struct platform_device *dev) { int ret; pxa2xx_audio_ops_t *pdata = dev->dev.platform_data; if (pdata) { switch (pdata->reset_gpio) { case 95: case 113: reset_gpio = pdata->reset_gpio; break; case 0: reset_gpio = 113; break; case -1: break; default: dev_err(&dev->dev, "Invalid reset GPIO %d\n", pdata->reset_gpio); } } else if (!pdata && dev->dev.of_node) { pdata = devm_kzalloc(&dev->dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) return -ENOMEM; pdata->reset_gpio = of_get_named_gpio(dev->dev.of_node, "reset-gpios", 0); if (pdata->reset_gpio == -ENOENT) pdata->reset_gpio = -1; else if (pdata->reset_gpio < 0) return pdata->reset_gpio; reset_gpio = pdata->reset_gpio; } else { if (cpu_is_pxa27x()) reset_gpio = 113; } if (cpu_is_pxa27x()) { /* * 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); ac97conf_clk = NULL; goto err_conf; } } ac97_clk = clk_get(&dev->dev, "AC97CLK"); if (IS_ERR(ac97_clk)) { ret = PTR_ERR(ac97_clk); ac97_clk = NULL; goto err_clk; } ret = clk_prepare_enable(ac97_clk); if (ret) goto err_clk2; ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, 0, "AC97", NULL); if (ret < 0) goto err_irq; return 0; err_irq: GCR |= GCR_ACLINK_OFF; err_clk2: clk_put(ac97_clk); ac97_clk = NULL; err_clk: if (ac97conf_clk) { clk_put(ac97conf_clk); ac97conf_clk = NULL; } err_conf: return ret; } 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) { clk_put(ac97conf_clk); ac97conf_clk = NULL; } clk_disable_unprepare(ac97_clk); clk_put(ac97_clk); ac97_clk = NULL; } EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_remove); MODULE_AUTHOR("Nicolas Pitre"); MODULE_DESCRIPTION("Intel/Marvell PXA sound library"); MODULE_LICENSE("GPL");