diff options
Diffstat (limited to 'sound/arm/aaci.c')
| -rw-r--r-- | sound/arm/aaci.c | 968 |
1 files changed, 968 insertions, 0 deletions
diff --git a/sound/arm/aaci.c b/sound/arm/aaci.c new file mode 100644 index 00000000000..08cc3ddca96 --- /dev/null +++ b/sound/arm/aaci.c @@ -0,0 +1,968 @@ +/* + * linux/sound/arm/aaci.c - ARM PrimeCell AACI PL041 driver + * + * Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved. + * + * 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. + * + * Documentation: ARM DDI 0173B + */ +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/ioport.h> +#include <linux/device.h> +#include <linux/spinlock.h> +#include <linux/interrupt.h> +#include <linux/err.h> + +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/hardware/amba.h> + +#include <sound/driver.h> +#include <sound/core.h> +#include <sound/initval.h> +#include <sound/ac97_codec.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> + +#include "aaci.h" +#include "devdma.h" + +#define DRIVER_NAME "aaci-pl041" + +/* + * PM support is not complete. Turn it off. + */ +#undef CONFIG_PM + +static void aaci_ac97_select_codec(struct aaci *aaci, ac97_t *ac97) +{ + u32 v, maincr = aaci->maincr | MAINCR_SCRA(ac97->num); + + /* + * Ensure that the slot 1/2 RX registers are empty. + */ + v = readl(aaci->base + AACI_SLFR); + if (v & SLFR_2RXV) + readl(aaci->base + AACI_SL2RX); + if (v & SLFR_1RXV) + readl(aaci->base + AACI_SL1RX); + + writel(maincr, aaci->base + AACI_MAINCR); +} + +/* + * P29: + * The recommended use of programming the external codec through slot 1 + * and slot 2 data is to use the channels during setup routines and the + * slot register at any other time. The data written into slot 1, slot 2 + * and slot 12 registers is transmitted only when their corresponding + * SI1TxEn, SI2TxEn and SI12TxEn bits are set in the AACI_MAINCR + * register. + */ +static void aaci_ac97_write(ac97_t *ac97, unsigned short reg, unsigned short val) +{ + struct aaci *aaci = ac97->private_data; + u32 v; + + if (ac97->num >= 4) + return; + + down(&aaci->ac97_sem); + + aaci_ac97_select_codec(aaci, ac97); + + /* + * P54: You must ensure that AACI_SL2TX is always written + * to, if required, before data is written to AACI_SL1TX. + */ + writel(val << 4, aaci->base + AACI_SL2TX); + writel(reg << 12, aaci->base + AACI_SL1TX); + + /* + * Wait for the transmission of both slots to complete. + */ + do { + v = readl(aaci->base + AACI_SLFR); + } while (v & (SLFR_1TXB|SLFR_2TXB)); + + up(&aaci->ac97_sem); +} + +/* + * Read an AC'97 register. + */ +static unsigned short aaci_ac97_read(ac97_t *ac97, unsigned short reg) +{ + struct aaci *aaci = ac97->private_data; + u32 v; + + if (ac97->num >= 4) + return ~0; + + down(&aaci->ac97_sem); + + aaci_ac97_select_codec(aaci, ac97); + + /* + * Write the register address to slot 1. + */ + writel((reg << 12) | (1 << 19), aaci->base + AACI_SL1TX); + + /* + * Wait for the transmission to complete. + */ + do { + v = readl(aaci->base + AACI_SLFR); + } while (v & SLFR_1TXB); + + /* + * Give the AC'97 codec more than enough time + * to respond. (42us = ~2 frames at 48kHz.) + */ + udelay(42); + + /* + * Wait for slot 2 to indicate data. + */ + do { + cond_resched(); + v = readl(aaci->base + AACI_SLFR) & (SLFR_1RXV|SLFR_2RXV); + } while (v != (SLFR_1RXV|SLFR_2RXV)); + + v = readl(aaci->base + AACI_SL1RX) >> 12; + if (v == reg) { + v = readl(aaci->base + AACI_SL2RX) >> 4; + } else { + dev_err(&aaci->dev->dev, + "wrong ac97 register read back (%x != %x)\n", + v, reg); + v = ~0; + } + + up(&aaci->ac97_sem); + return v; +} + +static inline void aaci_chan_wait_ready(struct aaci_runtime *aacirun) +{ + u32 val; + int timeout = 5000; + + do { + val = readl(aacirun->base + AACI_SR); + } while (val & (SR_TXB|SR_RXB) && timeout--); +} + + + +/* + * Interrupt support. + */ +static void aaci_fifo_irq(struct aaci *aaci, u32 mask) +{ + if (mask & ISR_URINTR) { + writel(ICLR_TXUEC1, aaci->base + AACI_INTCLR); + } + + if (mask & ISR_TXINTR) { + struct aaci_runtime *aacirun = &aaci->playback; + void *ptr; + + if (!aacirun->substream || !aacirun->start) { + dev_warn(&aaci->dev->dev, "TX interrupt???"); + writel(0, aacirun->base + AACI_IE); + return; + } + + ptr = aacirun->ptr; + do { + unsigned int len = aacirun->fifosz; + u32 val; + + if (aacirun->bytes <= 0) { + aacirun->bytes += aacirun->period; + aacirun->ptr = ptr; + spin_unlock(&aaci->lock); + snd_pcm_period_elapsed(aacirun->substream); + spin_lock(&aaci->lock); + } + if (!(aacirun->cr & TXCR_TXEN)) + break; + + val = readl(aacirun->base + AACI_SR); + if (!(val & SR_TXHE)) + break; + if (!(val & SR_TXFE)) + len >>= 1; + + aacirun->bytes -= len; + + /* writing 16 bytes at a time */ + for ( ; len > 0; len -= 16) { + asm( + "ldmia %0!, {r0, r1, r2, r3}\n\t" + "stmia %1, {r0, r1, r2, r3}" + : "+r" (ptr) + : "r" (aacirun->fifo) + : "r0", "r1", "r2", "r3", "cc"); + + if (ptr >= aacirun->end) + ptr = aacirun->start; + } + } while (1); + + aacirun->ptr = ptr; + } +} + +static irqreturn_t aaci_irq(int irq, void *devid, struct pt_regs *regs) +{ + struct aaci *aaci = devid; + u32 mask; + int i; + + spin_lock(&aaci->lock); + mask = readl(aaci->base + AACI_ALLINTS); + if (mask) { + u32 m = mask; + for (i = 0; i < 4; i++, m >>= 7) { + if (m & 0x7f) { + aaci_fifo_irq(aaci, m); + } + } + } + spin_unlock(&aaci->lock); + + return mask ? IRQ_HANDLED : IRQ_NONE; +} + + + +/* + * ALSA support. + */ + +struct aaci_stream { + unsigned char codec_idx; + unsigned char rate_idx; +}; + +static struct aaci_stream aaci_streams[] = { + [ACSTREAM_FRONT] = { + .codec_idx = 0, + .rate_idx = AC97_RATES_FRONT_DAC, + }, + [ACSTREAM_SURROUND] = { + .codec_idx = 0, + .rate_idx = AC97_RATES_SURR_DAC, + }, + [ACSTREAM_LFE] = { + .codec_idx = 0, + .rate_idx = AC97_RATES_LFE_DAC, + }, +}; + +static inline unsigned int aaci_rate_mask(struct aaci *aaci, int streamid) +{ + struct aaci_stream *s = aaci_streams + streamid; + return aaci->ac97_bus->codec[s->codec_idx]->rates[s->rate_idx]; +} + +static unsigned int rate_list[] = { + 5512, 8000, 11025, 16000, 22050, 32000, 44100, + 48000, 64000, 88200, 96000, 176400, 192000 +}; + +/* + * Double-rate rule: we can support double rate iff channels == 2 + * (unimplemented) + */ +static int +aaci_rule_rate_by_channels(snd_pcm_hw_params_t *p, snd_pcm_hw_rule_t *rule) +{ + struct aaci *aaci = rule->private; + unsigned int rate_mask = SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_5512; + snd_interval_t *c = hw_param_interval(p, SNDRV_PCM_HW_PARAM_CHANNELS); + + switch (c->max) { + case 6: + rate_mask &= aaci_rate_mask(aaci, ACSTREAM_LFE); + case 4: + rate_mask &= aaci_rate_mask(aaci, ACSTREAM_SURROUND); + case 2: + rate_mask &= aaci_rate_mask(aaci, ACSTREAM_FRONT); + } + + return snd_interval_list(hw_param_interval(p, rule->var), + ARRAY_SIZE(rate_list), rate_list, + rate_mask); +} + +static snd_pcm_hardware_t aaci_hw_info = { + .info = SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID | + SNDRV_PCM_INFO_INTERLEAVED | + SNDRV_PCM_INFO_BLOCK_TRANSFER | + SNDRV_PCM_INFO_RESUME, + + /* + * ALSA doesn't support 18-bit or 20-bit packed into 32-bit + * words. It also doesn't support 12-bit at all. + */ + .formats = SNDRV_PCM_FMTBIT_S16_LE, + + /* should this be continuous or knot? */ + .rates = SNDRV_PCM_RATE_CONTINUOUS, + .rate_max = 48000, + .rate_min = 4000, + .channels_min = 2, + .channels_max = 6, + .buffer_bytes_max = 64 * 1024, + .period_bytes_min = 256, + .period_bytes_max = PAGE_SIZE, + .periods_min = 4, + .periods_max = PAGE_SIZE / 16, +}; + +static int aaci_pcm_open(struct aaci *aaci, snd_pcm_substream_t *substream, + struct aaci_runtime *aacirun) +{ + snd_pcm_runtime_t *runtime = substream->runtime; + int ret; + + aacirun->substream = substream; + runtime->private_data = aacirun; + runtime->hw = aaci_hw_info; + + /* + * FIXME: ALSA specifies fifo_size in bytes. If we're in normal + * mode, each 32-bit word contains one sample. If we're in + * compact mode, each 32-bit word contains two samples, effectively + * halving the FIFO size. However, we don't know for sure which + * we'll be using at this point. We set this to the lower limit. + */ + runtime->hw.fifo_size = aaci->fifosize * 2; + + /* + * Add rule describing hardware rate dependency + * on the number of channels. + */ + ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, + aaci_rule_rate_by_channels, aaci, + SNDRV_PCM_HW_PARAM_CHANNELS, + SNDRV_PCM_HW_PARAM_RATE, -1); + if (ret) + goto out; + + ret = request_irq(aaci->dev->irq[0], aaci_irq, SA_SHIRQ|SA_INTERRUPT, + DRIVER_NAME, aaci); + if (ret) + goto out; + + return 0; + + out: + return ret; +} + + +/* + * Common ALSA stuff + */ +static int aaci_pcm_close(snd_pcm_substream_t *substream) +{ + struct aaci *aaci = substream->private_data; + struct aaci_runtime *aacirun = substream->runtime->private_data; + + WARN_ON(aacirun->cr & TXCR_TXEN); + + aacirun->substream = NULL; + free_irq(aaci->dev->irq[0], aaci); + + return 0; +} + +static int aaci_pcm_hw_free(snd_pcm_substream_t *substream) +{ + struct aaci_runtime *aacirun = substream->runtime->private_data; + + /* + * This must not be called with the device enabled. + */ + WARN_ON(aacirun->cr & TXCR_TXEN); + + if (aacirun->pcm_open) + snd_ac97_pcm_close(aacirun->pcm); + aacirun->pcm_open = 0; + + /* + * Clear out the DMA and any allocated buffers. + */ + devdma_hw_free(NULL, substream); + + return 0; +} + +static int aaci_pcm_hw_params(snd_pcm_substream_t *substream, + struct aaci_runtime *aacirun, + snd_pcm_hw_params_t *params) +{ + int err; + + aaci_pcm_hw_free(substream); + + err = devdma_hw_alloc(NULL, substream, + params_buffer_bytes(params)); + if (err < 0) + goto out; + + err = snd_ac97_pcm_open(aacirun->pcm, params_rate(params), + params_channels(params), + aacirun->pcm->r[0].slots); + if (err) + goto out; + + aacirun->pcm_open = 1; + + out: + return err; +} + +static int aaci_pcm_prepare(snd_pcm_substream_t *substream) +{ + snd_pcm_runtime_t *runtime = substream->runtime; + struct aaci_runtime *aacirun = runtime->private_data; + + aacirun->start = (void *)runtime->dma_area; + aacirun->end = aacirun->start + runtime->dma_bytes; + aacirun->ptr = aacirun->start; + aacirun->period = + aacirun->bytes = frames_to_bytes(runtime, runtime->period_size); + + return 0; +} + +static snd_pcm_uframes_t aaci_pcm_pointer(snd_pcm_substream_t *substream) +{ + snd_pcm_runtime_t *runtime = substream->runtime; + struct aaci_runtime *aacirun = runtime->private_data; + ssize_t bytes = aacirun->ptr - aacirun->start; + + return bytes_to_frames(runtime, bytes); +} + +static int aaci_pcm_mmap(snd_pcm_substream_t *substream, struct vm_area_struct *vma) +{ + return devdma_mmap(NULL, substream, vma); +} + + +/* + * Playback specific ALSA stuff + */ +static const u32 channels_to_txmask[] = { + [2] = TXCR_TX3 | TXCR_TX4, + [4] = TXCR_TX3 | TXCR_TX4 | TXCR_TX7 | TXCR_TX8, + [6] = TXCR_TX3 | TXCR_TX4 | TXCR_TX7 | TXCR_TX8 | TXCR_TX6 | TXCR_TX9, +}; + +/* + * We can support two and four channel audio. Unfortunately + * six channel audio requires a non-standard channel ordering: + * 2 -> FL(3), FR(4) + * 4 -> FL(3), FR(4), SL(7), SR(8) + * 6 -> FL(3), FR(4), SL(7), SR(8), C(6), LFE(9) (required) + * FL(3), FR(4), C(6), SL(7), SR(8), LFE(9) (actual) + * This requires an ALSA configuration file to correct. + */ +static unsigned int channel_list[] = { 2, 4, 6 }; + +static int +aaci_rule_channels(snd_pcm_hw_params_t *p, snd_pcm_hw_rule_t *rule) +{ + struct aaci *aaci = rule->private; + unsigned int chan_mask = 1 << 0, slots; + + /* + * pcms[0] is the our 5.1 PCM instance. + */ + slots = aaci->ac97_bus->pcms[0].r[0].slots; + if (slots & (1 << AC97_SLOT_PCM_SLEFT)) { + chan_mask |= 1 << 1; + if (slots & (1 << AC97_SLOT_LFE)) + chan_mask |= 1 << 2; + } + + return snd_interval_list(hw_param_interval(p, rule->var), + ARRAY_SIZE(channel_list), channel_list, + chan_mask); +} + +static int aaci_pcm_playback_open(snd_pcm_substream_t *substream) +{ + struct aaci *aaci = substream->private_data; + int ret; + + /* + * Add rule describing channel dependency. + */ + ret = snd_pcm_hw_rule_add(substream->runtime, 0, + SNDRV_PCM_HW_PARAM_CHANNELS, + aaci_rule_channels, aaci, + SNDRV_PCM_HW_PARAM_CHANNELS, -1); + if (ret) + return ret; + + return aaci_pcm_open(aaci, substream, &aaci->playback); +} + +static int aaci_pcm_playback_hw_params(snd_pcm_substream_t *substream, + snd_pcm_hw_params_t *params) +{ + struct aaci *aaci = substream->private_data; + struct aaci_runtime *aacirun = substream->runtime->private_data; + unsigned int channels = params_channels(params); + int ret; + + WARN_ON(channels >= ARRAY_SIZE(channels_to_txmask) || + !channels_to_txmask[channels]); + + ret = aaci_pcm_hw_params(substream, aacirun, params); + + /* + * Enable FIFO, compact mode, 16 bits per sample. + * FIXME: double rate slots? + */ + if (ret >= 0) { + aacirun->cr = TXCR_FEN | TXCR_COMPACT | TXCR_TSZ16; + aacirun->cr |= channels_to_txmask[channels]; + + aacirun->fifosz = aaci->fifosize * 4; + if (aacirun->cr & TXCR_COMPACT) + aacirun->fifosz >>= 1; + } + return ret; +} + +static void aaci_pcm_playback_stop(struct aaci_runtime *aacirun) +{ + u32 ie; + + ie = readl(aacirun->base + AACI_IE); + ie &= ~(IE_URIE|IE_TXIE); + writel(ie, aacirun->base + AACI_IE); + aacirun->cr &= ~TXCR_TXEN; + aaci_chan_wait_ready(aacirun); + writel(aacirun->cr, aacirun->base + AACI_TXCR); +} + +static void aaci_pcm_playback_start(struct aaci_runtime *aacirun) +{ + u32 ie; + + aaci_chan_wait_ready(aacirun); + aacirun->cr |= TXCR_TXEN; + + ie = readl(aacirun->base + AACI_IE); + ie |= IE_URIE | IE_TXIE; + writel(ie, aacirun->base + AACI_IE); + writel(aacirun->cr, aacirun->base + AACI_TXCR); +} + +static int aaci_pcm_playback_trigger(snd_pcm_substream_t *substream, int cmd) +{ + struct aaci *aaci = substream->private_data; + struct aaci_runtime *aacirun = substream->runtime->private_data; + unsigned long flags; + int ret = 0; + + spin_lock_irqsave(&aaci->lock, flags); + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + aaci_pcm_playback_start(aacirun); + break; + + case SNDRV_PCM_TRIGGER_RESUME: + aaci_pcm_playback_start(aacirun); + break; + + case SNDRV_PCM_TRIGGER_STOP: + aaci_pcm_playback_stop(aacirun); + break; + + case SNDRV_PCM_TRIGGER_SUSPEND: + aaci_pcm_playback_stop(aacirun); + break; + + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + break; + + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + break; + + default: + ret = -EINVAL; + } + spin_unlock_irqrestore(&aaci->lock, flags); + + return ret; +} + +static snd_pcm_ops_t aaci_playback_ops = { + .open = aaci_pcm_playback_open, + .close = aaci_pcm_close, + .ioctl = snd_pcm_lib_ioctl, + .hw_params = aaci_pcm_playback_hw_params, + .hw_free = aaci_pcm_hw_free, + .prepare = aaci_pcm_prepare, + .trigger = aaci_pcm_playback_trigger, + .pointer = aaci_pcm_pointer, + .mmap = aaci_pcm_mmap, +}; + + + +/* + * Power Management. + */ +#ifdef CONFIG_PM +static int aaci_do_suspend(snd_card_t *card, unsigned int state) +{ + struct aaci *aaci = card->private_data; + if (aaci->card->power_state != SNDRV_CTL_POWER_D3cold) { + snd_pcm_suspend_all(aaci->pcm); + snd_power_change_state(aaci->card, SNDRV_CTL_POWER_D3cold); + } + return 0; +} + +static int aaci_do_resume(snd_card_t *card, unsigned int state) +{ + struct aaci *aaci = card->private_data; + if (aaci->card->power_state != SNDRV_CTL_POWER_D0) { + snd_power_change_state(aaci->card, SNDRV_CTL_POWER_D0); + } + return 0; +} + +static int aaci_suspend(struct amba_device *dev, u32 state) +{ + snd_card_t *card = amba_get_drvdata(dev); + return card ? aaci_do_suspend(card) : 0; +} + +static int aaci_resume(struct amba_device *dev) +{ + snd_card_t *card = amba_get_drvdata(dev); + return card ? aaci_do_resume(card) : 0; +} +#else +#define aaci_do_suspend NULL +#define aaci_do_resume NULL +#define aaci_suspend NULL +#define aaci_resume NULL +#endif + + +static struct ac97_pcm ac97_defs[] __devinitdata = { + [0] = { /* Front PCM */ + .exclusive = 1, + .r = { + [0] = { + .slots = (1 << AC97_SLOT_PCM_LEFT) | + (1 << AC97_SLOT_PCM_RIGHT) | + (1 << AC97_SLOT_PCM_CENTER) | + (1 << AC97_SLOT_PCM_SLEFT) | + (1 << AC97_SLOT_PCM_SRIGHT) | + (1 << AC97_SLOT_LFE), + }, + }, + }, + [1] = { /* PCM in */ + .stream = 1, + .exclusive = 1, + .r = { + [0] = { + .slots = (1 << AC97_SLOT_PCM_LEFT) | + (1 << AC97_SLOT_PCM_RIGHT), + }, + }, + }, + [2] = { /* Mic in */ + .stream = 1, + .exclusive = 1, + .r = { + [0] = { + .slots = (1 << AC97_SLOT_MIC), + }, + }, + } +}; + +static ac97_bus_ops_t aaci_bus_ops = { + .write = aaci_ac97_write, + .read = aaci_ac97_read, +}; + +static int __devinit aaci_probe_ac97(struct aaci *aaci) +{ + ac97_template_t ac97_template; + ac97_bus_t *ac97_bus; + ac97_t *ac97; + int ret; + + /* + * Assert AACIRESET for 2us + */ + writel(0, aaci->base + AACI_RESET); + udelay(2); + writel(RESET_NRST, aaci->base + AACI_RESET); + + /* + * Give the AC'97 codec more than enough time + * to wake up. (42us = ~2 frames at 48kHz.) + */ + udelay(42); + + ret = snd_ac97_bus(aaci->card, 0, &aaci_bus_ops, aaci, &ac97_bus); + if (ret) + goto out; + + ac97_bus->clock = 48000; + aaci->ac97_bus = ac97_bus; + + memset(&ac97_template, 0, sizeof(ac97_template_t)); + ac97_template.private_data = aaci; + ac97_template.num = 0; + ac97_template.scaps = AC97_SCAP_SKIP_MODEM; + + ret = snd_ac97_mixer(ac97_bus, &ac97_template, &ac97); + if (ret) + goto out; + + /* + * Disable AC97 PC Beep input on audio codecs. + */ + if (ac97_is_audio(ac97)) + snd_ac97_write_cache(ac97, AC97_PC_BEEP, 0x801e); + + ret = snd_ac97_pcm_assign(ac97_bus, ARRAY_SIZE(ac97_defs), ac97_defs); + if (ret) + goto out; + + aaci->playback.pcm = &ac97_bus->pcms[0]; + + out: + return ret; +} + +static void aaci_free_card(snd_card_t *card) +{ + struct aaci *aaci = card->private_data; + if (aaci->base) + iounmap(aaci->base); +} + +static struct aaci * __devinit aaci_init_card(struct amba_device *dev) +{ + struct aaci *aaci; + snd_card_t *card; + + card = snd_card_new(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1, + THIS_MODULE, sizeof(struct aaci)); + if (card == NULL) + return ERR_PTR(-ENOMEM); + + card->private_free = aaci_free_card; + snd_card_set_pm_callback(card, aaci_do_suspend, aaci_do_resume, NULL); + + strlcpy(card->driver, DRIVER_NAME, sizeof(card->driver)); + strlcpy(card->shortname, "ARM AC'97 Interface", sizeof(card->shortname)); + snprintf(card->longname, sizeof(card->longname), + "%s at 0x%08lx, irq %d", + card->shortname, dev->res.start, dev->irq[0]); + + aaci = card->private_data; + init_MUTEX(&aaci->ac97_sem); + spin_lock_init(&aaci->lock); + aaci->card = card; + aaci->dev = dev; + + /* Set MAINCR to allow slot 1 and 2 data IO */ + aaci->maincr = MAINCR_IE | MAINCR_SL1RXEN | MAINCR_SL1TXEN | + MAINCR_SL2RXEN | MAINCR_SL2TXEN; + + return aaci; +} + +static int __devinit aaci_init_pcm(struct aaci *aaci) +{ + snd_pcm_t *pcm; + int ret; + + ret = snd_pcm_new(aaci->card, "AACI AC'97", 0, 1, 0, &pcm); + if (ret == 0) { + aaci->pcm = pcm; + pcm->private_data = aaci; + pcm->info_flags = 0; + + strlcpy(pcm->name, DRIVER_NAME, sizeof(pcm->name)); + + snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &aaci_playback_ops); + } + + return ret; +} + +static unsigned int __devinit aaci_size_fifo(struct aaci *aaci) +{ + void *base = aaci->base + AACI_CSCH1; + int i; + + writel(TXCR_FEN | TXCR_TSZ16 | TXCR_TXEN, base + AACI_TXCR); + + for (i = 0; !(readl(base + AACI_SR) & SR_TXFF) && i < 4096; i++) + writel(0, aaci->base + AACI_DR1); + + writel(0, base + AACI_TXCR); + + /* + * Re-initialise the AACI after the FIFO depth test, to + * ensure that the FIFOs are empty. Unfortunately, merely + * disabling the channel doesn't clear the FIFO. + */ + writel(aaci->maincr & ~MAINCR_IE, aaci->base + AACI_MAINCR); + writel(aaci->maincr, aaci->base + AACI_MAINCR); + + /* + * If we hit 4096, we failed. Go back to the specified + * fifo depth. + */ + if (i == 4096) + i = 8; + + return i; +} + +static int __devinit aaci_probe(struct amba_device *dev, void *id) +{ + struct aaci *aaci; + int ret, i; + + ret = amba_request_regions(dev, NULL); + if (ret) + return ret; + + aaci = aaci_init_card(dev); + if (IS_ERR(aaci)) { + ret = PTR_ERR(aaci); + goto out; + } + + aaci->base = ioremap(dev->res.start, SZ_4K); + if (!aaci->base) { + ret = -ENOMEM; + goto out; + } + + /* + * Playback uses AACI channel 0 + */ + aaci->playback.base = aaci->base + AACI_CSCH1; + aaci->playback.fifo = aaci->base + AACI_DR1; + + for (i = 0; i < 4; i++) { + void *base = aaci->base + i * 0x14; + + writel(0, base + AACI_IE); + writel(0, base + AACI_TXCR); + writel(0, base + AACI_RXCR); + } + + writel(0x1fff, aaci->base + AACI_INTCLR); + writel(aaci->maincr, aaci->base + AACI_MAINCR); + + /* + * Size the FIFOs. + */ + aaci->fifosize = aaci_size_fifo(aaci); + + ret = aaci_probe_ac97(aaci); + if (ret) + goto out; + + ret = aaci_init_pcm(aaci); + if (ret) + goto out; + + ret = snd_card_register(aaci->card); + if (ret == 0) { + dev_info(&dev->dev, "%s, fifo %d\n", aaci->card->longname, + aaci->fifosize); + amba_set_drvdata(dev, aaci->card); + return ret; + } + + out: + if (aaci) + snd_card_free(aaci->card); + amba_release_regions(dev); + return ret; +} + +static int __devexit aaci_remove(struct amba_device *dev) +{ + snd_card_t *card = amba_get_drvdata(dev); + + amba_set_drvdata(dev, NULL); + + if (card) { + struct aaci *aaci = card->private_data; + writel(0, aaci->base + AACI_MAINCR); + + snd_card_free(card); + amba_release_regions(dev); + } + + return 0; +} + +static struct amba_id aaci_ids[] = { + { + .id = 0x00041041, + .mask = 0x000fffff, + }, + { 0, 0 }, +}; + +static struct amba_driver aaci_driver = { + .drv = { + .name = DRIVER_NAME, + }, + .probe = aaci_probe, + .remove = __devexit_p(aaci_remove), + .suspend = aaci_suspend, + .resume = aaci_resume, + .id_table = aaci_ids, +}; + +static int __init aaci_init(void) +{ + return amba_driver_register(&aaci_driver); +} + +static void __exit aaci_exit(void) +{ + amba_driver_unregister(&aaci_driver); +} + +module_init(aaci_init); +module_exit(aaci_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("ARM PrimeCell PL041 Advanced Audio CODEC Interface driver"); |