diff options
Diffstat (limited to 'sound/soc/cirrus/ep93xx-ac97.c')
| -rw-r--r-- | sound/soc/cirrus/ep93xx-ac97.c | 446 |
1 files changed, 0 insertions, 446 deletions
diff --git a/sound/soc/cirrus/ep93xx-ac97.c b/sound/soc/cirrus/ep93xx-ac97.c deleted file mode 100644 index 37593abe6053..000000000000 --- a/sound/soc/cirrus/ep93xx-ac97.c +++ /dev/null @@ -1,446 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * ASoC driver for Cirrus Logic EP93xx AC97 controller. - * - * Copyright (c) 2010 Mika Westerberg - * - * Based on s3c-ac97 ASoC driver by Jaswinder Singh. - */ - -#include <linux/delay.h> -#include <linux/err.h> -#include <linux/io.h> -#include <linux/init.h> -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/slab.h> - -#include <sound/core.h> -#include <sound/dmaengine_pcm.h> -#include <sound/ac97_codec.h> -#include <sound/soc.h> - -#include <linux/platform_data/dma-ep93xx.h> -#include <linux/soc/cirrus/ep93xx.h> - -#include "ep93xx-pcm.h" - -/* - * Per channel (1-4) registers. - */ -#define AC97CH(n) (((n) - 1) * 0x20) - -#define AC97DR(n) (AC97CH(n) + 0x0000) - -#define AC97RXCR(n) (AC97CH(n) + 0x0004) -#define AC97RXCR_REN BIT(0) -#define AC97RXCR_RX3 BIT(3) -#define AC97RXCR_RX4 BIT(4) -#define AC97RXCR_CM BIT(15) - -#define AC97TXCR(n) (AC97CH(n) + 0x0008) -#define AC97TXCR_TEN BIT(0) -#define AC97TXCR_TX3 BIT(3) -#define AC97TXCR_TX4 BIT(4) -#define AC97TXCR_CM BIT(15) - -#define AC97SR(n) (AC97CH(n) + 0x000c) -#define AC97SR_TXFE BIT(1) -#define AC97SR_TXUE BIT(6) - -#define AC97RISR(n) (AC97CH(n) + 0x0010) -#define AC97ISR(n) (AC97CH(n) + 0x0014) -#define AC97IE(n) (AC97CH(n) + 0x0018) - -/* - * Global AC97 controller registers. - */ -#define AC97S1DATA 0x0080 -#define AC97S2DATA 0x0084 -#define AC97S12DATA 0x0088 - -#define AC97RGIS 0x008c -#define AC97GIS 0x0090 -#define AC97IM 0x0094 -/* - * Common bits for RGIS, GIS and IM registers. - */ -#define AC97_SLOT2RXVALID BIT(1) -#define AC97_CODECREADY BIT(5) -#define AC97_SLOT2TXCOMPLETE BIT(6) - -#define AC97EOI 0x0098 -#define AC97EOI_WINT BIT(0) -#define AC97EOI_CODECREADY BIT(1) - -#define AC97GCR 0x009c -#define AC97GCR_AC97IFE BIT(0) - -#define AC97RESET 0x00a0 -#define AC97RESET_TIMEDRESET BIT(0) - -#define AC97SYNC 0x00a4 -#define AC97SYNC_TIMEDSYNC BIT(0) - -#define AC97_TIMEOUT msecs_to_jiffies(5) - -/** - * struct ep93xx_ac97_info - EP93xx AC97 controller info structure - * @lock: mutex serializing access to the bus (slot 1 & 2 ops) - * @dev: pointer to the platform device dev structure - * @regs: mapped AC97 controller registers - * @done: bus ops wait here for an interrupt - */ -struct ep93xx_ac97_info { - struct mutex lock; - struct device *dev; - void __iomem *regs; - struct completion done; - struct snd_dmaengine_dai_dma_data dma_params_rx; - struct snd_dmaengine_dai_dma_data dma_params_tx; -}; - -/* currently ALSA only supports a single AC97 device */ -static struct ep93xx_ac97_info *ep93xx_ac97_info; - -static struct ep93xx_dma_data ep93xx_ac97_pcm_out = { - .name = "ac97-pcm-out", - .port = EP93XX_DMA_AAC1, - .direction = DMA_MEM_TO_DEV, -}; - -static struct ep93xx_dma_data ep93xx_ac97_pcm_in = { - .name = "ac97-pcm-in", - .port = EP93XX_DMA_AAC1, - .direction = DMA_DEV_TO_MEM, -}; - -static inline unsigned ep93xx_ac97_read_reg(struct ep93xx_ac97_info *info, - unsigned reg) -{ - return __raw_readl(info->regs + reg); -} - -static inline void ep93xx_ac97_write_reg(struct ep93xx_ac97_info *info, - unsigned reg, unsigned val) -{ - __raw_writel(val, info->regs + reg); -} - -static unsigned short ep93xx_ac97_read(struct snd_ac97 *ac97, - unsigned short reg) -{ - struct ep93xx_ac97_info *info = ep93xx_ac97_info; - unsigned short val; - - mutex_lock(&info->lock); - - ep93xx_ac97_write_reg(info, AC97S1DATA, reg); - ep93xx_ac97_write_reg(info, AC97IM, AC97_SLOT2RXVALID); - if (!wait_for_completion_timeout(&info->done, AC97_TIMEOUT)) { - dev_warn(info->dev, "timeout reading register %x\n", reg); - mutex_unlock(&info->lock); - return -ETIMEDOUT; - } - val = (unsigned short)ep93xx_ac97_read_reg(info, AC97S2DATA); - - mutex_unlock(&info->lock); - return val; -} - -static void ep93xx_ac97_write(struct snd_ac97 *ac97, - unsigned short reg, - unsigned short val) -{ - struct ep93xx_ac97_info *info = ep93xx_ac97_info; - - mutex_lock(&info->lock); - - /* - * Writes to the codec need to be done so that slot 2 is filled in - * before slot 1. - */ - ep93xx_ac97_write_reg(info, AC97S2DATA, val); - ep93xx_ac97_write_reg(info, AC97S1DATA, reg); - - ep93xx_ac97_write_reg(info, AC97IM, AC97_SLOT2TXCOMPLETE); - if (!wait_for_completion_timeout(&info->done, AC97_TIMEOUT)) - dev_warn(info->dev, "timeout writing register %x\n", reg); - - mutex_unlock(&info->lock); -} - -static void ep93xx_ac97_warm_reset(struct snd_ac97 *ac97) -{ - struct ep93xx_ac97_info *info = ep93xx_ac97_info; - - mutex_lock(&info->lock); - - /* - * We are assuming that before this functions gets called, the codec - * BIT_CLK is stopped by forcing the codec into powerdown mode. We can - * control the SYNC signal directly via AC97SYNC register. Using - * TIMEDSYNC the controller will keep the SYNC high > 1us. - */ - ep93xx_ac97_write_reg(info, AC97SYNC, AC97SYNC_TIMEDSYNC); - ep93xx_ac97_write_reg(info, AC97IM, AC97_CODECREADY); - if (!wait_for_completion_timeout(&info->done, AC97_TIMEOUT)) - dev_warn(info->dev, "codec warm reset timeout\n"); - - mutex_unlock(&info->lock); -} - -static void ep93xx_ac97_cold_reset(struct snd_ac97 *ac97) -{ - struct ep93xx_ac97_info *info = ep93xx_ac97_info; - - mutex_lock(&info->lock); - - /* - * For doing cold reset, we disable the AC97 controller interface, clear - * WINT and CODECREADY bits, and finally enable the interface again. - */ - ep93xx_ac97_write_reg(info, AC97GCR, 0); - ep93xx_ac97_write_reg(info, AC97EOI, AC97EOI_CODECREADY | AC97EOI_WINT); - ep93xx_ac97_write_reg(info, AC97GCR, AC97GCR_AC97IFE); - - /* - * Now, assert the reset and wait for the codec to become ready. - */ - ep93xx_ac97_write_reg(info, AC97RESET, AC97RESET_TIMEDRESET); - ep93xx_ac97_write_reg(info, AC97IM, AC97_CODECREADY); - if (!wait_for_completion_timeout(&info->done, AC97_TIMEOUT)) - dev_warn(info->dev, "codec cold reset timeout\n"); - - /* - * Give the codec some time to come fully out from the reset. This way - * we ensure that the subsequent reads/writes will work. - */ - usleep_range(15000, 20000); - - mutex_unlock(&info->lock); -} - -static irqreturn_t ep93xx_ac97_interrupt(int irq, void *dev_id) -{ - struct ep93xx_ac97_info *info = dev_id; - unsigned status, mask; - - /* - * Just mask out the interrupt and wake up the waiting thread. - * Interrupts are cleared via reading/writing to slot 1 & 2 registers by - * the waiting thread. - */ - status = ep93xx_ac97_read_reg(info, AC97GIS); - mask = ep93xx_ac97_read_reg(info, AC97IM); - mask &= ~status; - ep93xx_ac97_write_reg(info, AC97IM, mask); - - complete(&info->done); - return IRQ_HANDLED; -} - -static struct snd_ac97_bus_ops ep93xx_ac97_ops = { - .read = ep93xx_ac97_read, - .write = ep93xx_ac97_write, - .reset = ep93xx_ac97_cold_reset, - .warm_reset = ep93xx_ac97_warm_reset, -}; - -static int ep93xx_ac97_trigger(struct snd_pcm_substream *substream, - int cmd, struct snd_soc_dai *dai) -{ - struct ep93xx_ac97_info *info = snd_soc_dai_get_drvdata(dai); - unsigned v = 0; - - switch (cmd) { - case SNDRV_PCM_TRIGGER_START: - case SNDRV_PCM_TRIGGER_RESUME: - case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: - if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { - /* - * Enable compact mode, TX slots 3 & 4, and the TX FIFO - * itself. - */ - v |= AC97TXCR_CM; - v |= AC97TXCR_TX3 | AC97TXCR_TX4; - v |= AC97TXCR_TEN; - ep93xx_ac97_write_reg(info, AC97TXCR(1), v); - } else { - /* - * Enable compact mode, RX slots 3 & 4, and the RX FIFO - * itself. - */ - v |= AC97RXCR_CM; - v |= AC97RXCR_RX3 | AC97RXCR_RX4; - v |= AC97RXCR_REN; - ep93xx_ac97_write_reg(info, AC97RXCR(1), v); - } - break; - - case SNDRV_PCM_TRIGGER_STOP: - case SNDRV_PCM_TRIGGER_SUSPEND: - case SNDRV_PCM_TRIGGER_PAUSE_PUSH: - if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { - /* - * As per Cirrus EP93xx errata described below: - * - * https://www.cirrus.com/en/pubs/errata/ER667E2B.pdf - * - * we will wait for the TX FIFO to be empty before - * clearing the TEN bit. - */ - unsigned long timeout = jiffies + AC97_TIMEOUT; - - do { - v = ep93xx_ac97_read_reg(info, AC97SR(1)); - if (time_after(jiffies, timeout)) { - dev_warn(info->dev, "TX timeout\n"); - break; - } - } while (!(v & (AC97SR_TXFE | AC97SR_TXUE))); - - /* disable the TX FIFO */ - ep93xx_ac97_write_reg(info, AC97TXCR(1), 0); - } else { - /* disable the RX FIFO */ - ep93xx_ac97_write_reg(info, AC97RXCR(1), 0); - } - break; - - default: - dev_warn(info->dev, "unknown command %d\n", cmd); - return -EINVAL; - } - - return 0; -} - -static int ep93xx_ac97_dai_probe(struct snd_soc_dai *dai) -{ - struct ep93xx_ac97_info *info = snd_soc_dai_get_drvdata(dai); - - info->dma_params_tx.filter_data = &ep93xx_ac97_pcm_out; - info->dma_params_rx.filter_data = &ep93xx_ac97_pcm_in; - - dai->playback_dma_data = &info->dma_params_tx; - dai->capture_dma_data = &info->dma_params_rx; - - return 0; -} - -static const struct snd_soc_dai_ops ep93xx_ac97_dai_ops = { - .trigger = ep93xx_ac97_trigger, -}; - -static struct snd_soc_dai_driver ep93xx_ac97_dai = { - .name = "ep93xx-ac97", - .id = 0, - .probe = ep93xx_ac97_dai_probe, - .playback = { - .stream_name = "AC97 Playback", - .channels_min = 2, - .channels_max = 2, - .rates = SNDRV_PCM_RATE_8000_48000, - .formats = SNDRV_PCM_FMTBIT_S16_LE, - }, - .capture = { - .stream_name = "AC97 Capture", - .channels_min = 2, - .channels_max = 2, - .rates = SNDRV_PCM_RATE_8000_48000, - .formats = SNDRV_PCM_FMTBIT_S16_LE, - }, - .ops = &ep93xx_ac97_dai_ops, -}; - -static const struct snd_soc_component_driver ep93xx_ac97_component = { - .name = "ep93xx-ac97", - .legacy_dai_naming = 1, -}; - -static int ep93xx_ac97_probe(struct platform_device *pdev) -{ - struct ep93xx_ac97_info *info; - int irq; - int ret; - - info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); - if (!info) - return -ENOMEM; - - info->regs = devm_platform_ioremap_resource(pdev, 0); - if (IS_ERR(info->regs)) - return PTR_ERR(info->regs); - - irq = platform_get_irq(pdev, 0); - if (irq <= 0) - return irq < 0 ? irq : -ENODEV; - - ret = devm_request_irq(&pdev->dev, irq, ep93xx_ac97_interrupt, - IRQF_TRIGGER_HIGH, pdev->name, info); - if (ret) - goto fail; - - dev_set_drvdata(&pdev->dev, info); - - mutex_init(&info->lock); - init_completion(&info->done); - info->dev = &pdev->dev; - - ep93xx_ac97_info = info; - platform_set_drvdata(pdev, info); - - ret = snd_soc_set_ac97_ops(&ep93xx_ac97_ops); - if (ret) - goto fail; - - ret = snd_soc_register_component(&pdev->dev, &ep93xx_ac97_component, - &ep93xx_ac97_dai, 1); - if (ret) - goto fail; - - ret = devm_ep93xx_pcm_platform_register(&pdev->dev); - if (ret) - goto fail_unregister; - - return 0; - -fail_unregister: - snd_soc_unregister_component(&pdev->dev); -fail: - ep93xx_ac97_info = NULL; - snd_soc_set_ac97_ops(NULL); - return ret; -} - -static int ep93xx_ac97_remove(struct platform_device *pdev) -{ - struct ep93xx_ac97_info *info = platform_get_drvdata(pdev); - - snd_soc_unregister_component(&pdev->dev); - - /* disable the AC97 controller */ - ep93xx_ac97_write_reg(info, AC97GCR, 0); - - ep93xx_ac97_info = NULL; - - snd_soc_set_ac97_ops(NULL); - - return 0; -} - -static struct platform_driver ep93xx_ac97_driver = { - .probe = ep93xx_ac97_probe, - .remove = ep93xx_ac97_remove, - .driver = { - .name = "ep93xx-ac97", - }, -}; - -module_platform_driver(ep93xx_ac97_driver); - -MODULE_DESCRIPTION("EP93xx AC97 ASoC Driver"); -MODULE_AUTHOR("Mika Westerberg <mika.westerberg@iki.fi>"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("platform:ep93xx-ac97"); |