/* * Driver for the Atmel AC97C controller * * Copyright (C) 2005-2009 Atmel Corporation * * 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/clk.h> #include <linux/delay.h> #include <linux/bitmap.h> #include <linux/dmaengine.h> #include <linux/dma-mapping.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/mutex.h> #include <linux/gpio.h> #include <linux/io.h> #include <sound/core.h> #include <sound/initval.h> #include <sound/pcm.h> #include <sound/pcm_params.h> #include <sound/ac97_codec.h> #include <sound/atmel-ac97c.h> #include <sound/memalloc.h> #include <linux/dw_dmac.h> #include "ac97c.h" enum { DMA_TX_READY = 0, DMA_RX_READY, DMA_TX_CHAN_PRESENT, DMA_RX_CHAN_PRESENT, }; /* Serialize access to opened variable */ static DEFINE_MUTEX(opened_mutex); struct atmel_ac97c_dma { struct dma_chan *rx_chan; struct dma_chan *tx_chan; }; struct atmel_ac97c { struct clk *pclk; struct platform_device *pdev; struct atmel_ac97c_dma dma; struct snd_pcm_substream *playback_substream; struct snd_pcm_substream *capture_substream; struct snd_card *card; struct snd_pcm *pcm; struct snd_ac97 *ac97; struct snd_ac97_bus *ac97_bus; u64 cur_format; unsigned int cur_rate; unsigned long flags; /* Serialize access to opened variable */ spinlock_t lock; void __iomem *regs; int opened; int reset_pin; }; #define get_chip(card) ((struct atmel_ac97c *)(card)->private_data) #define ac97c_writel(chip, reg, val) \ __raw_writel((val), (chip)->regs + AC97C_##reg) #define ac97c_readl(chip, reg) \ __raw_readl((chip)->regs + AC97C_##reg) /* This function is called by the DMA driver. */ static void atmel_ac97c_dma_playback_period_done(void *arg) { struct atmel_ac97c *chip = arg; snd_pcm_period_elapsed(chip->playback_substream); } static void atmel_ac97c_dma_capture_period_done(void *arg) { struct atmel_ac97c *chip = arg; snd_pcm_period_elapsed(chip->capture_substream); } static int atmel_ac97c_prepare_dma(struct atmel_ac97c *chip, struct snd_pcm_substream *substream, enum dma_data_direction direction) { struct dma_chan *chan; struct dw_cyclic_desc *cdesc; struct snd_pcm_runtime *runtime = substream->runtime; unsigned long buffer_len, period_len; /* * We don't do DMA on "complex" transfers, i.e. with * non-halfword-aligned buffers or lengths. */ if (runtime->dma_addr & 1 || runtime->buffer_size & 1) { dev_dbg(&chip->pdev->dev, "too complex transfer\n"); return -EINVAL; } if (direction == DMA_TO_DEVICE) chan = chip->dma.tx_chan; else chan = chip->dma.rx_chan; buffer_len = frames_to_bytes(runtime, runtime->buffer_size); period_len = frames_to_bytes(runtime, runtime->period_size); cdesc = dw_dma_cyclic_prep(chan, runtime->dma_addr, buffer_len, period_len, direction); if (IS_ERR(cdesc)) { dev_dbg(&chip->pdev->dev, "could not prepare cyclic DMA\n"); return PTR_ERR(cdesc); } if (direction == DMA_TO_DEVICE) { cdesc->period_callback = atmel_ac97c_dma_playback_period_done; set_bit(DMA_TX_READY, &chip->flags); } else { cdesc->period_callback = atmel_ac97c_dma_capture_period_done; set_bit(DMA_RX_READY, &chip->flags); } cdesc->period_callback_param = chip; return 0; } static struct snd_pcm_hardware atmel_ac97c_hw = { .info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_JOINT_DUPLEX | SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_PAUSE), .formats = (SNDRV_PCM_FMTBIT_S16_BE | SNDRV_PCM_FMTBIT_S16_LE), .rates = (SNDRV_PCM_RATE_CONTINUOUS), .rate_min = 4000, .rate_max = 48000, .channels_min = 1, .channels_max = 2, .buffer_bytes_max = 64 * 4096, .period_bytes_min = 4096, .period_bytes_max = 4096, .periods_min = 4, .periods_max = 64, }; static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); struct snd_pcm_runtime *runtime = substream->runtime; mutex_lock(&opened_mutex); chip->opened++; runtime->hw = atmel_ac97c_hw; if (chip->cur_rate) { runtime->hw.rate_min = chip->cur_rate; runtime->hw.rate_max = chip->cur_rate; } if (chip->cur_format) runtime->hw.formats = (1ULL << chip->cur_format); mutex_unlock(&opened_mutex); chip->playback_substream = substream; return 0; } static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); struct snd_pcm_runtime *runtime = substream->runtime; mutex_lock(&opened_mutex); chip->opened++; runtime->hw = atmel_ac97c_hw; if (chip->cur_rate) { runtime->hw.rate_min = chip->cur_rate; runtime->hw.rate_max = chip->cur_rate; } if (chip->cur_format) runtime->hw.formats = (1ULL << chip->cur_format); mutex_unlock(&opened_mutex); chip->capture_substream = substream; return 0; } static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); mutex_lock(&opened_mutex); chip->opened--; if (!chip->opened) { chip->cur_rate = 0; chip->cur_format = 0; } mutex_unlock(&opened_mutex); chip->playback_substream = NULL; return 0; } static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); mutex_lock(&opened_mutex); chip->opened--; if (!chip->opened) { chip->cur_rate = 0; chip->cur_format = 0; } mutex_unlock(&opened_mutex); chip->capture_substream = NULL; return 0; } static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); int retval; retval = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params)); if (retval < 0) return retval; /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ if (retval == 1) if (test_and_clear_bit(DMA_TX_READY, &chip->flags)) dw_dma_cyclic_free(chip->dma.tx_chan); /* Set restrictions to params. */ mutex_lock(&opened_mutex); chip->cur_rate = params_rate(hw_params); chip->cur_format = params_format(hw_params); mutex_unlock(&opened_mutex); return retval; } static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); int retval; retval = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params)); if (retval < 0) return retval; /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ if (retval == 1) if (test_and_clear_bit(DMA_RX_READY, &chip->flags)) dw_dma_cyclic_free(chip->dma.rx_chan); /* Set restrictions to params. */ mutex_lock(&opened_mutex); chip->cur_rate = params_rate(hw_params); chip->cur_format = params_format(hw_params); mutex_unlock(&opened_mutex); return retval; } static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); if (test_and_clear_bit(DMA_TX_READY, &chip->flags)) dw_dma_cyclic_free(chip->dma.tx_chan); return snd_pcm_lib_free_pages(substream); } static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); if (test_and_clear_bit(DMA_RX_READY, &chip->flags)) dw_dma_cyclic_free(chip->dma.rx_chan); return snd_pcm_lib_free_pages(substream); } static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); struct snd_pcm_runtime *runtime = substream->runtime; unsigned long word = 0; int retval; /* assign channels to AC97C channel A */ switch (runtime->channels) { case 1: word |= AC97C_CH_ASSIGN(PCM_LEFT, A); break; case 2: word |= AC97C_CH_ASSIGN(PCM_LEFT, A) | AC97C_CH_ASSIGN(PCM_RIGHT, A); break; default: /* TODO: support more than two channels */ return -EINVAL; break; } ac97c_writel(chip, OCA, word); /* configure sample format and size */ word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; switch (runtime->format) { case SNDRV_PCM_FORMAT_S16_LE: word |= AC97C_CMR_CEM_LITTLE; break; case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ default: word &= ~(AC97C_CMR_CEM_LITTLE); break; } ac97c_writel(chip, CAMR, word); /* set variable rate if needed */ if (runtime->rate != 48000) { word = ac97c_readl(chip, MR); word |= AC97C_MR_VRA; ac97c_writel(chip, MR, word); } else { word = ac97c_readl(chip, MR); word &= ~(AC97C_MR_VRA); ac97c_writel(chip, MR, word); } retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate); if (retval) dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", runtime->rate); if (!test_bit(DMA_TX_READY, &chip->flags)) retval = atmel_ac97c_prepare_dma(chip, substream, DMA_TO_DEVICE); return retval; } static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); struct snd_pcm_runtime *runtime = substream->runtime; unsigned long word = 0; int retval; /* assign channels to AC97C channel A */ switch (runtime->channels) { case 1: word |= AC97C_CH_ASSIGN(PCM_LEFT, A); break; case 2: word |= AC97C_CH_ASSIGN(PCM_LEFT, A) | AC97C_CH_ASSIGN(PCM_RIGHT, A); break; default: /* TODO: support more than two channels */ return -EINVAL; break; } ac97c_writel(chip, ICA, word); /* configure sample format and size */ word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; switch (runtime->format) { case SNDRV_PCM_FORMAT_S16_LE: word |= AC97C_CMR_CEM_LITTLE; break; case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ default: word &= ~(AC97C_CMR_CEM_LITTLE); break; } ac97c_writel(chip, CAMR, word); /* set variable rate if needed */ if (runtime->rate != 48000) { word = ac97c_readl(chip, MR); word |= AC97C_MR_VRA; ac97c_writel(chip, MR, word); } else { word = ac97c_readl(chip, MR); word &= ~(AC97C_MR_VRA); ac97c_writel(chip, MR, word); } retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate); if (retval) dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", runtime->rate); if (!test_bit(DMA_RX_READY, &chip->flags)) retval = atmel_ac97c_prepare_dma(chip, substream, DMA_FROM_DEVICE); return retval; } static int atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); unsigned long camr; int retval = 0; camr = ac97c_readl(chip, CAMR); switch (cmd) { case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ case SNDRV_PCM_TRIGGER_START: retval = dw_dma_cyclic_start(chip->dma.tx_chan); if (retval) goto out; camr |= AC97C_CMR_CENA; break; case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ case SNDRV_PCM_TRIGGER_STOP: dw_dma_cyclic_stop(chip->dma.tx_chan); if (chip->opened <= 1) camr &= ~AC97C_CMR_CENA; break; default: retval = -EINVAL; goto out; } ac97c_writel(chip, CAMR, camr); out: return retval; } static int atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); unsigned long camr; int retval = 0; camr = ac97c_readl(chip, CAMR); switch (cmd) { case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ case SNDRV_PCM_TRIGGER_START: retval = dw_dma_cyclic_start(chip->dma.rx_chan); if (retval) goto out; camr |= AC97C_CMR_CENA; break; case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ case SNDRV_PCM_TRIGGER_STOP: dw_dma_cyclic_stop(chip->dma.rx_chan); if (chip->opened <= 1) camr &= ~AC97C_CMR_CENA; break; default: retval = -EINVAL; break; } ac97c_writel(chip, CAMR, camr); out: return retval; } static snd_pcm_uframes_t atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); struct snd_pcm_runtime *runtime = substream->runtime; snd_pcm_uframes_t frames; unsigned long bytes; bytes = dw_dma_get_src_addr(chip->dma.tx_chan); bytes -= runtime->dma_addr; frames = bytes_to_frames(runtime, bytes); if (frames >= runtime->buffer_size) frames -= runtime->buffer_size; return frames; } static snd_pcm_uframes_t atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream) { struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); struct snd_pcm_runtime *runtime = substream->runtime; snd_pcm_uframes_t frames; unsigned long bytes; bytes = dw_dma_get_dst_addr(chip->dma.rx_chan); bytes -= runtime->dma_addr; frames = bytes_to_frames(runtime, bytes); if (frames >= runtime->buffer_size) frames -= runtime->buffer_size; return frames; } static struct snd_pcm_ops atmel_ac97_playback_ops = { .open = atmel_ac97c_playback_open, .close = atmel_ac97c_playback_close, .ioctl = snd_pcm_lib_ioctl, .hw_params = atmel_ac97c_playback_hw_params, .hw_free = atmel_ac97c_playback_hw_free, .prepare = atmel_ac97c_playback_prepare, .trigger = atmel_ac97c_playback_trigger, .pointer = atmel_ac97c_playback_pointer, }; static struct snd_pcm_ops atmel_ac97_capture_ops = { .open = atmel_ac97c_capture_open, .close = atmel_ac97c_capture_close, .ioctl = snd_pcm_lib_ioctl, .hw_params = atmel_ac97c_capture_hw_params, .hw_free = atmel_ac97c_capture_hw_free, .prepare = atmel_ac97c_capture_prepare, .trigger = atmel_ac97c_capture_trigger, .pointer = atmel_ac97c_capture_pointer, }; static int __devinit atmel_ac97c_pcm_new(struct atmel_ac97c *chip) { struct snd_pcm *pcm; struct snd_pcm_hardware hw = atmel_ac97c_hw; int capture, playback, retval; capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags); playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags); retval = snd_pcm_new(chip->card, chip->card->shortname, chip->pdev->id, playback, capture, &pcm); if (retval) return retval; if (capture) snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &atmel_ac97_capture_ops); if (playback) snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &atmel_ac97_playback_ops); retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, &chip->pdev->dev, hw.periods_min * hw.period_bytes_min, hw.buffer_bytes_max); if (retval) return retval; pcm->private_data = chip; pcm->info_flags = 0; strcpy(pcm->name, chip->card->shortname); chip->pcm = pcm; return 0; } static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip) { struct snd_ac97_template template; memset(&template, 0, sizeof(template)); template.private_data = chip; return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97); } static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val) { struct atmel_ac97c *chip = get_chip(ac97); unsigned long word; int timeout = 40; word = (reg & 0x7f) << 16 | val; do { if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) { ac97c_writel(chip, COTHR, word); return; } udelay(1); } while (--timeout); dev_dbg(&chip->pdev->dev, "codec write timeout\n"); } static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97, unsigned short reg) { struct atmel_ac97c *chip = get_chip(ac97); unsigned long word; int timeout = 40; int write = 10; word = (0x80 | (reg & 0x7f)) << 16; if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) ac97c_readl(chip, CORHR); retry_write: timeout = 40; do { if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) { ac97c_writel(chip, COTHR, word); goto read_reg; } udelay(10); } while (--timeout); if (!--write) goto timed_out; goto retry_write; read_reg: do { if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) { unsigned short val = ac97c_readl(chip, CORHR); return val; } udelay(10); } while (--timeout); if (!--write) goto timed_out; goto retry_write; timed_out: dev_dbg(&chip->pdev->dev, "codec read timeout\n"); return 0xffff; } static bool filter(struct dma_chan *chan, void *slave) { struct dw_dma_slave *dws = slave; if (dws->dma_dev == chan->device->dev) { chan->private = dws; return true; } else return false; } static void atmel_ac97c_reset(struct atmel_ac97c *chip) { ac97c_writel(chip, MR, AC97C_MR_WRST); if (gpio_is_valid(chip->reset_pin)) { gpio_set_value(chip->reset_pin, 0); /* AC97 v2.2 specifications says minimum 1 us. */ udelay(10); gpio_set_value(chip->reset_pin, 1); } udelay(1); ac97c_writel(chip, MR, AC97C_MR_ENA); } static int __devinit atmel_ac97c_probe(struct platform_device *pdev) { struct snd_card *card; struct atmel_ac97c *chip; struct resource *regs; struct ac97c_platform_data *pdata; struct clk *pclk; static struct snd_ac97_bus_ops ops = { .write = atmel_ac97c_write, .read = atmel_ac97c_read, }; int retval; regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!regs) { dev_dbg(&pdev->dev, "no memory resource\n"); return -ENXIO; } pdata = pdev->dev.platform_data; if (!pdata) { dev_dbg(&pdev->dev, "no platform data\n"); return -ENXIO; } pclk = clk_get(&pdev->dev, "pclk"); if (IS_ERR(pclk)) { dev_dbg(&pdev->dev, "no peripheral clock\n"); return PTR_ERR(pclk); } clk_enable(pclk); retval = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1, THIS_MODULE, sizeof(struct atmel_ac97c), &card); if (retval) { dev_dbg(&pdev->dev, "could not create sound card device\n"); goto err_snd_card_new; } chip = get_chip(card); spin_lock_init(&chip->lock); strcpy(card->driver, "Atmel AC97C"); strcpy(card->shortname, "Atmel AC97C"); sprintf(card->longname, "Atmel AC97 controller"); chip->card = card; chip->pclk = pclk; chip->pdev = pdev; chip->regs = ioremap(regs->start, regs->end - regs->start + 1); if (!chip->regs) { dev_dbg(&pdev->dev, "could not remap register memory\n"); goto err_ioremap; } if (gpio_is_valid(pdata->reset_pin)) { if (gpio_request(pdata->reset_pin, "reset_pin")) { dev_dbg(&pdev->dev, "reset pin not available\n"); chip->reset_pin = -ENODEV; } else { gpio_direction_output(pdata->reset_pin, 1); chip->reset_pin = pdata->reset_pin; } } snd_card_set_dev(card, &pdev->dev); retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus); if (retval) { dev_dbg(&pdev->dev, "could not register on ac97 bus\n"); goto err_ac97_bus; } atmel_ac97c_reset(chip); retval = atmel_ac97c_mixer_new(chip); if (retval) { dev_dbg(&pdev->dev, "could not register ac97 mixer\n"); goto err_ac97_bus; } if (pdata->rx_dws.dma_dev) { struct dw_dma_slave *dws = &pdata->rx_dws; dma_cap_mask_t mask; dws->rx_reg = regs->start + AC97C_CARHR + 2; dma_cap_zero(mask); dma_cap_set(DMA_SLAVE, mask); chip->dma.rx_chan = dma_request_channel(mask, filter, dws); dev_info(&chip->pdev->dev, "using %s for DMA RX\n", chip->dma.rx_chan->dev->device.bus_id); set_bit(DMA_RX_CHAN_PRESENT, &chip->flags); } if (pdata->tx_dws.dma_dev) { struct dw_dma_slave *dws = &pdata->tx_dws; dma_cap_mask_t mask; dws->tx_reg = regs->start + AC97C_CATHR + 2; dma_cap_zero(mask); dma_cap_set(DMA_SLAVE, mask); chip->dma.tx_chan = dma_request_channel(mask, filter, dws); dev_info(&chip->pdev->dev, "using %s for DMA TX\n", chip->dma.tx_chan->dev->device.bus_id); set_bit(DMA_TX_CHAN_PRESENT, &chip->flags); } if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) && !test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) { dev_dbg(&pdev->dev, "DMA not available\n"); retval = -ENODEV; goto err_dma; } retval = atmel_ac97c_pcm_new(chip); if (retval) { dev_dbg(&pdev->dev, "could not register ac97 pcm device\n"); goto err_dma; } retval = snd_card_register(card); if (retval) { dev_dbg(&pdev->dev, "could not register sound card\n"); goto err_ac97_bus; } platform_set_drvdata(pdev, card); dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p\n", chip->regs); return 0; err_dma: if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags)) dma_release_channel(chip->dma.rx_chan); if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) dma_release_channel(chip->dma.tx_chan); clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags); clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags); chip->dma.rx_chan = NULL; chip->dma.tx_chan = NULL; err_ac97_bus: snd_card_set_dev(card, NULL); if (gpio_is_valid(chip->reset_pin)) gpio_free(chip->reset_pin); iounmap(chip->regs); err_ioremap: snd_card_free(card); err_snd_card_new: clk_disable(pclk); clk_put(pclk); return retval; } #ifdef CONFIG_PM static int atmel_ac97c_suspend(struct platform_device *pdev, pm_message_t msg) { struct snd_card *card = platform_get_drvdata(pdev); struct atmel_ac97c *chip = card->private_data; if (test_bit(DMA_RX_READY, &chip->flags)) dw_dma_cyclic_stop(chip->dma.rx_chan); if (test_bit(DMA_TX_READY, &chip->flags)) dw_dma_cyclic_stop(chip->dma.tx_chan); clk_disable(chip->pclk); return 0; } static int atmel_ac97c_resume(struct platform_device *pdev) { struct snd_card *card = platform_get_drvdata(pdev); struct atmel_ac97c *chip = card->private_data; clk_enable(chip->pclk); if (test_bit(DMA_RX_READY, &chip->flags)) dw_dma_cyclic_start(chip->dma.rx_chan); if (test_bit(DMA_TX_READY, &chip->flags)) dw_dma_cyclic_start(chip->dma.tx_chan); return 0; } #else #define atmel_ac97c_suspend NULL #define atmel_ac97c_resume NULL #endif static int __devexit atmel_ac97c_remove(struct platform_device *pdev) { struct snd_card *card = platform_get_drvdata(pdev); struct atmel_ac97c *chip = get_chip(card); if (gpio_is_valid(chip->reset_pin)) gpio_free(chip->reset_pin); clk_disable(chip->pclk); clk_put(chip->pclk); iounmap(chip->regs); if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags)) dma_release_channel(chip->dma.rx_chan); if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) dma_release_channel(chip->dma.tx_chan); clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags); clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags); chip->dma.rx_chan = NULL; chip->dma.tx_chan = NULL; snd_card_set_dev(card, NULL); snd_card_free(card); platform_set_drvdata(pdev, NULL); return 0; } static struct platform_driver atmel_ac97c_driver = { .remove = __devexit_p(atmel_ac97c_remove), .driver = { .name = "atmel_ac97c", }, .suspend = atmel_ac97c_suspend, .resume = atmel_ac97c_resume, }; static int __init atmel_ac97c_init(void) { return platform_driver_probe(&atmel_ac97c_driver, atmel_ac97c_probe); } module_init(atmel_ac97c_init); static void __exit atmel_ac97c_exit(void) { platform_driver_unregister(&atmel_ac97c_driver); } module_exit(atmel_ac97c_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Driver for Atmel AC97 controller"); MODULE_AUTHOR("Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>");