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Diffstat (limited to '')
| -rw-r--r-- | sound/arm/aaci.c | 1111 |
1 files changed, 1111 insertions, 0 deletions
diff --git a/sound/arm/aaci.c b/sound/arm/aaci.c new file mode 100644 index 000000000..0114ffed5 --- /dev/null +++ b/sound/arm/aaci.c @@ -0,0 +1,1111 @@ +/* + * 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 <linux/amba/bus.h> +#include <linux/io.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" + +#define DRIVER_NAME "aaci-pl041" + +#define FRAME_PERIOD_US 21 + +/* + * PM support is not complete. Turn it off. + */ +#undef CONFIG_PM + +static void aaci_ac97_select_codec(struct aaci *aaci, struct snd_ac97 *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); + + if (maincr != readl(aaci->base + AACI_MAINCR)) { + writel(maincr, aaci->base + AACI_MAINCR); + readl(aaci->base + AACI_MAINCR); + udelay(1); + } +} + +/* + * 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(struct snd_ac97 *ac97, unsigned short reg, + unsigned short val) +{ + struct aaci *aaci = ac97->private_data; + int timeout; + u32 v; + + if (ac97->num >= 4) + return; + + mutex_lock(&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); + + /* Initially, wait one frame period */ + udelay(FRAME_PERIOD_US); + + /* And then wait an additional eight frame periods for it to be sent */ + timeout = FRAME_PERIOD_US * 8; + do { + udelay(1); + v = readl(aaci->base + AACI_SLFR); + } while ((v & (SLFR_1TXB|SLFR_2TXB)) && --timeout); + + if (v & (SLFR_1TXB|SLFR_2TXB)) + dev_err(&aaci->dev->dev, + "timeout waiting for write to complete\n"); + + mutex_unlock(&aaci->ac97_sem); +} + +/* + * Read an AC'97 register. + */ +static unsigned short aaci_ac97_read(struct snd_ac97 *ac97, unsigned short reg) +{ + struct aaci *aaci = ac97->private_data; + int timeout, retries = 10; + u32 v; + + if (ac97->num >= 4) + return ~0; + + mutex_lock(&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); + + /* Initially, wait one frame period */ + udelay(FRAME_PERIOD_US); + + /* And then wait an additional eight frame periods for it to be sent */ + timeout = FRAME_PERIOD_US * 8; + do { + udelay(1); + v = readl(aaci->base + AACI_SLFR); + } while ((v & SLFR_1TXB) && --timeout); + + if (v & SLFR_1TXB) { + dev_err(&aaci->dev->dev, "timeout on slot 1 TX busy\n"); + v = ~0; + goto out; + } + + /* Now wait for the response frame */ + udelay(FRAME_PERIOD_US); + + /* And then wait an additional eight frame periods for data */ + timeout = FRAME_PERIOD_US * 8; + do { + udelay(1); + cond_resched(); + v = readl(aaci->base + AACI_SLFR) & (SLFR_1RXV|SLFR_2RXV); + } while ((v != (SLFR_1RXV|SLFR_2RXV)) && --timeout); + + if (v != (SLFR_1RXV|SLFR_2RXV)) { + dev_err(&aaci->dev->dev, "timeout on RX valid\n"); + v = ~0; + goto out; + } + + do { + v = readl(aaci->base + AACI_SL1RX) >> 12; + if (v == reg) { + v = readl(aaci->base + AACI_SL2RX) >> 4; + break; + } else if (--retries) { + dev_warn(&aaci->dev->dev, + "ac97 read back fail. retry\n"); + continue; + } else { + dev_warn(&aaci->dev->dev, + "wrong ac97 register read back (%x != %x)\n", + v, reg); + v = ~0; + } + } while (retries); + out: + mutex_unlock(&aaci->ac97_sem); + return v; +} + +static inline void +aaci_chan_wait_ready(struct aaci_runtime *aacirun, unsigned long mask) +{ + u32 val; + int timeout = 5000; + + do { + udelay(1); + val = readl(aacirun->base + AACI_SR); + } while (val & mask && timeout--); +} + + + +/* + * Interrupt support. + */ +static void aaci_fifo_irq(struct aaci *aaci, int channel, u32 mask) +{ + if (mask & ISR_ORINTR) { + dev_warn(&aaci->dev->dev, "RX overrun on chan %d\n", channel); + writel(ICLR_RXOEC1 << channel, aaci->base + AACI_INTCLR); + } + + if (mask & ISR_RXTOINTR) { + dev_warn(&aaci->dev->dev, "RX timeout on chan %d\n", channel); + writel(ICLR_RXTOFEC1 << channel, aaci->base + AACI_INTCLR); + } + + if (mask & ISR_RXINTR) { + struct aaci_runtime *aacirun = &aaci->capture; + bool period_elapsed = false; + void *ptr; + + if (!aacirun->substream || !aacirun->start) { + dev_warn(&aaci->dev->dev, "RX interrupt???\n"); + writel(0, aacirun->base + AACI_IE); + return; + } + + spin_lock(&aacirun->lock); + + ptr = aacirun->ptr; + do { + unsigned int len = aacirun->fifo_bytes; + u32 val; + + if (aacirun->bytes <= 0) { + aacirun->bytes += aacirun->period; + period_elapsed = true; + } + if (!(aacirun->cr & CR_EN)) + break; + + val = readl(aacirun->base + AACI_SR); + if (!(val & SR_RXHF)) + break; + if (!(val & SR_RXFF)) + len >>= 1; + + aacirun->bytes -= len; + + /* reading 16 bytes at a time */ + for( ; len > 0; len -= 16) { + asm( + "ldmia %1, {r0, r1, r2, r3}\n\t" + "stmia %0!, {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; + + spin_unlock(&aacirun->lock); + + if (period_elapsed) + snd_pcm_period_elapsed(aacirun->substream); + } + + if (mask & ISR_URINTR) { + dev_dbg(&aaci->dev->dev, "TX underrun on chan %d\n", channel); + writel(ICLR_TXUEC1 << channel, aaci->base + AACI_INTCLR); + } + + if (mask & ISR_TXINTR) { + struct aaci_runtime *aacirun = &aaci->playback; + bool period_elapsed = false; + void *ptr; + + if (!aacirun->substream || !aacirun->start) { + dev_warn(&aaci->dev->dev, "TX interrupt???\n"); + writel(0, aacirun->base + AACI_IE); + return; + } + + spin_lock(&aacirun->lock); + + ptr = aacirun->ptr; + do { + unsigned int len = aacirun->fifo_bytes; + u32 val; + + if (aacirun->bytes <= 0) { + aacirun->bytes += aacirun->period; + period_elapsed = true; + } + if (!(aacirun->cr & CR_EN)) + 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; + + spin_unlock(&aacirun->lock); + + if (period_elapsed) + snd_pcm_period_elapsed(aacirun->substream); + } +} + +static irqreturn_t aaci_irq(int irq, void *devid) +{ + struct aaci *aaci = devid; + u32 mask; + int i; + + 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, i, m); + } + } + } + + return mask ? IRQ_HANDLED : IRQ_NONE; +} + + + +/* + * ALSA support. + */ +static const struct snd_pcm_hardware 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, + + /* rates are setup from the AC'97 codec */ + .channels_min = 2, + .channels_max = 2, + .buffer_bytes_max = 64 * 1024, + .period_bytes_min = 256, + .period_bytes_max = PAGE_SIZE, + .periods_min = 4, + .periods_max = PAGE_SIZE / 16, +}; + +/* + * 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 int aaci_rule_channels(struct snd_pcm_hw_params *p, + struct snd_pcm_hw_rule *rule) +{ + static unsigned int channel_list[] = { 2, 4, 6 }; + struct aaci *aaci = rule->private; + unsigned int 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)) { + mask |= 1 << 1; + if (slots & (1 << AC97_SLOT_LFE)) + mask |= 1 << 2; + } + + return snd_interval_list(hw_param_interval(p, rule->var), + ARRAY_SIZE(channel_list), channel_list, mask); +} + +static int aaci_pcm_open(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct aaci *aaci = substream->private_data; + struct aaci_runtime *aacirun; + int ret = 0; + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + aacirun = &aaci->playback; + } else { + aacirun = &aaci->capture; + } + + aacirun->substream = substream; + runtime->private_data = aacirun; + runtime->hw = aaci_hw_info; + runtime->hw.rates = aacirun->pcm->rates; + snd_pcm_limit_hw_rates(runtime); + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + runtime->hw.channels_max = 6; + + /* 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; + + if (aacirun->pcm->r[1].slots) + snd_ac97_pcm_double_rate_rules(runtime); + } + + /* + * ALSA wants the byte-size of the FIFOs. As we only support + * 16-bit samples, this is twice the FIFO depth irrespective + * of whether it's in compact mode or not. + */ + runtime->hw.fifo_size = aaci->fifo_depth * 2; + + mutex_lock(&aaci->irq_lock); + if (!aaci->users++) { + ret = request_irq(aaci->dev->irq[0], aaci_irq, + IRQF_SHARED, DRIVER_NAME, aaci); + if (ret != 0) + aaci->users--; + } + mutex_unlock(&aaci->irq_lock); + + return ret; +} + + +/* + * Common ALSA stuff + */ +static int aaci_pcm_close(struct snd_pcm_substream *substream) +{ + struct aaci *aaci = substream->private_data; + struct aaci_runtime *aacirun = substream->runtime->private_data; + + WARN_ON(aacirun->cr & CR_EN); + + aacirun->substream = NULL; + + mutex_lock(&aaci->irq_lock); + if (!--aaci->users) + free_irq(aaci->dev->irq[0], aaci); + mutex_unlock(&aaci->irq_lock); + + return 0; +} + +static int aaci_pcm_hw_free(struct snd_pcm_substream *substream) +{ + struct aaci_runtime *aacirun = substream->runtime->private_data; + + /* + * This must not be called with the device enabled. + */ + WARN_ON(aacirun->cr & CR_EN); + + if (aacirun->pcm_open) + snd_ac97_pcm_close(aacirun->pcm); + aacirun->pcm_open = 0; + + /* + * Clear out the DMA and any allocated buffers. + */ + snd_pcm_lib_free_pages(substream); + + return 0; +} + +/* Channel to slot mask */ +static const u32 channels_to_slotmask[] = { + [2] = CR_SL3 | CR_SL4, + [4] = CR_SL3 | CR_SL4 | CR_SL7 | CR_SL8, + [6] = CR_SL3 | CR_SL4 | CR_SL7 | CR_SL8 | CR_SL6 | CR_SL9, +}; + +static int aaci_pcm_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params) +{ + struct aaci_runtime *aacirun = substream->runtime->private_data; + unsigned int channels = params_channels(params); + unsigned int rate = params_rate(params); + int dbl = rate > 48000; + int err; + + aaci_pcm_hw_free(substream); + if (aacirun->pcm_open) { + snd_ac97_pcm_close(aacirun->pcm); + aacirun->pcm_open = 0; + } + + /* channels is already limited to 2, 4, or 6 by aaci_rule_channels */ + if (dbl && channels != 2) + return -EINVAL; + + err = snd_pcm_lib_malloc_pages(substream, + params_buffer_bytes(params)); + if (err >= 0) { + struct aaci *aaci = substream->private_data; + + err = snd_ac97_pcm_open(aacirun->pcm, rate, channels, + aacirun->pcm->r[dbl].slots); + + aacirun->pcm_open = err == 0; + aacirun->cr = CR_FEN | CR_COMPACT | CR_SZ16; + aacirun->cr |= channels_to_slotmask[channels + dbl * 2]; + + /* + * fifo_bytes is the number of bytes we transfer to/from + * the FIFO, including padding. So that's x4. As we're + * in compact mode, the FIFO is half the size. + */ + aacirun->fifo_bytes = aaci->fifo_depth * 4 / 2; + } + + return err; +} + +static int aaci_pcm_prepare(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct aaci_runtime *aacirun = runtime->private_data; + + aacirun->period = snd_pcm_lib_period_bytes(substream); + aacirun->start = runtime->dma_area; + aacirun->end = aacirun->start + snd_pcm_lib_buffer_bytes(substream); + aacirun->ptr = aacirun->start; + aacirun->bytes = aacirun->period; + + return 0; +} + +static snd_pcm_uframes_t aaci_pcm_pointer(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct aaci_runtime *aacirun = runtime->private_data; + ssize_t bytes = aacirun->ptr - aacirun->start; + + return bytes_to_frames(runtime, bytes); +} + + +/* + * Playback specific ALSA stuff + */ +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 &= ~CR_EN; + aaci_chan_wait_ready(aacirun, SR_TXB); + writel(aacirun->cr, aacirun->base + AACI_TXCR); +} + +static void aaci_pcm_playback_start(struct aaci_runtime *aacirun) +{ + u32 ie; + + aaci_chan_wait_ready(aacirun, SR_TXB); + aacirun->cr |= CR_EN; + + 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(struct snd_pcm_substream *substream, int cmd) +{ + struct aaci_runtime *aacirun = substream->runtime->private_data; + unsigned long flags; + int ret = 0; + + spin_lock_irqsave(&aacirun->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(&aacirun->lock, flags); + + return ret; +} + +static const struct snd_pcm_ops aaci_playback_ops = { + .open = aaci_pcm_open, + .close = aaci_pcm_close, + .ioctl = snd_pcm_lib_ioctl, + .hw_params = aaci_pcm_hw_params, + .hw_free = aaci_pcm_hw_free, + .prepare = aaci_pcm_prepare, + .trigger = aaci_pcm_playback_trigger, + .pointer = aaci_pcm_pointer, +}; + +static void aaci_pcm_capture_stop(struct aaci_runtime *aacirun) +{ + u32 ie; + + aaci_chan_wait_ready(aacirun, SR_RXB); + + ie = readl(aacirun->base + AACI_IE); + ie &= ~(IE_ORIE | IE_RXIE); + writel(ie, aacirun->base+AACI_IE); + + aacirun->cr &= ~CR_EN; + + writel(aacirun->cr, aacirun->base + AACI_RXCR); +} + +static void aaci_pcm_capture_start(struct aaci_runtime *aacirun) +{ + u32 ie; + + aaci_chan_wait_ready(aacirun, SR_RXB); + +#ifdef DEBUG + /* RX Timeout value: bits 28:17 in RXCR */ + aacirun->cr |= 0xf << 17; +#endif + + aacirun->cr |= CR_EN; + writel(aacirun->cr, aacirun->base + AACI_RXCR); + + ie = readl(aacirun->base + AACI_IE); + ie |= IE_ORIE |IE_RXIE; // overrun and rx interrupt -- half full + writel(ie, aacirun->base + AACI_IE); +} + +static int aaci_pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd) +{ + struct aaci_runtime *aacirun = substream->runtime->private_data; + unsigned long flags; + int ret = 0; + + spin_lock_irqsave(&aacirun->lock, flags); + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + aaci_pcm_capture_start(aacirun); + break; + + case SNDRV_PCM_TRIGGER_RESUME: + aaci_pcm_capture_start(aacirun); + break; + + case SNDRV_PCM_TRIGGER_STOP: + aaci_pcm_capture_stop(aacirun); + break; + + case SNDRV_PCM_TRIGGER_SUSPEND: + aaci_pcm_capture_stop(aacirun); + break; + + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + break; + + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + break; + + default: + ret = -EINVAL; + } + + spin_unlock_irqrestore(&aacirun->lock, flags); + + return ret; +} + +static int aaci_pcm_capture_prepare(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct aaci *aaci = substream->private_data; + + aaci_pcm_prepare(substream); + + /* allow changing of sample rate */ + aaci_ac97_write(aaci->ac97, AC97_EXTENDED_STATUS, 0x0001); /* VRA */ + aaci_ac97_write(aaci->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate); + aaci_ac97_write(aaci->ac97, AC97_PCM_MIC_ADC_RATE, runtime->rate); + + /* Record select: Mic: 0, Aux: 3, Line: 4 */ + aaci_ac97_write(aaci->ac97, AC97_REC_SEL, 0x0404); + + return 0; +} + +static const struct snd_pcm_ops aaci_capture_ops = { + .open = aaci_pcm_open, + .close = aaci_pcm_close, + .ioctl = snd_pcm_lib_ioctl, + .hw_params = aaci_pcm_hw_params, + .hw_free = aaci_pcm_hw_free, + .prepare = aaci_pcm_capture_prepare, + .trigger = aaci_pcm_capture_trigger, + .pointer = aaci_pcm_pointer, +}; + +/* + * Power Management. + */ +#ifdef CONFIG_PM +static int aaci_do_suspend(struct snd_card *card) +{ + struct aaci *aaci = card->private_data; + snd_power_change_state(card, SNDRV_CTL_POWER_D3cold); + snd_pcm_suspend_all(aaci->pcm); + return 0; +} + +static int aaci_do_resume(struct snd_card *card) +{ + snd_power_change_state(card, SNDRV_CTL_POWER_D0); + return 0; +} + +static int aaci_suspend(struct device *dev) +{ + struct snd_card *card = dev_get_drvdata(dev); + return card ? aaci_do_suspend(card) : 0; +} + +static int aaci_resume(struct device *dev) +{ + struct snd_card *card = dev_get_drvdata(dev); + return card ? aaci_do_resume(card) : 0; +} + +static SIMPLE_DEV_PM_OPS(aaci_dev_pm_ops, aaci_suspend, aaci_resume); +#define AACI_DEV_PM_OPS (&aaci_dev_pm_ops) +#else +#define AACI_DEV_PM_OPS NULL +#endif + + +static const struct ac97_pcm ac97_defs[] = { + [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] = { + .slots = (1 << AC97_SLOT_PCM_LEFT) | + (1 << AC97_SLOT_PCM_RIGHT) | + (1 << AC97_SLOT_PCM_LEFT_0) | + (1 << AC97_SLOT_PCM_RIGHT_0), + }, + }, + }, + [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 struct snd_ac97_bus_ops aaci_bus_ops = { + .write = aaci_ac97_write, + .read = aaci_ac97_read, +}; + +static int aaci_probe_ac97(struct aaci *aaci) +{ + struct snd_ac97_template ac97_template; + struct snd_ac97_bus *ac97_bus; + struct snd_ac97 *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(FRAME_PERIOD_US * 2); + + 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(struct snd_ac97_template)); + 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; + aaci->ac97 = ac97; + + /* + * 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]; + aaci->capture.pcm = &ac97_bus->pcms[1]; + + out: + return ret; +} + +static void aaci_free_card(struct snd_card *card) +{ + struct aaci *aaci = card->private_data; + + iounmap(aaci->base); +} + +static struct aaci *aaci_init_card(struct amba_device *dev) +{ + struct aaci *aaci; + struct snd_card *card; + int err; + + err = snd_card_new(&dev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1, + THIS_MODULE, sizeof(struct aaci), &card); + if (err < 0) + return NULL; + + card->private_free = aaci_free_card; + + 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 PL%03x rev%u at 0x%08llx, irq %d", + card->shortname, amba_part(dev), amba_rev(dev), + (unsigned long long)dev->res.start, dev->irq[0]); + + aaci = card->private_data; + mutex_init(&aaci->ac97_sem); + mutex_init(&aaci->irq_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 aaci_init_pcm(struct aaci *aaci) +{ + struct snd_pcm *pcm; + int ret; + + ret = snd_pcm_new(aaci->card, "AACI AC'97", 0, 1, 1, &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); + snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &aaci_capture_ops); + snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, + NULL, 0, 64 * 1024); + } + + return ret; +} + +static unsigned int aaci_size_fifo(struct aaci *aaci) +{ + struct aaci_runtime *aacirun = &aaci->playback; + int i; + + /* + * Enable the channel, but don't assign it to any slots, so + * it won't empty onto the AC'97 link. + */ + writel(CR_FEN | CR_SZ16 | CR_EN, aacirun->base + AACI_TXCR); + + for (i = 0; !(readl(aacirun->base + AACI_SR) & SR_TXFF) && i < 4096; i++) + writel(0, aacirun->fifo); + + writel(0, aacirun->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); + readl(aaci->base + AACI_MAINCR); + udelay(1); + writel(aaci->maincr, aaci->base + AACI_MAINCR); + + /* + * If we hit 4096 entries, we failed. Go back to the specified + * fifo depth. + */ + if (i == 4096) + i = 8; + + return i; +} + +static int aaci_probe(struct amba_device *dev, + const struct amba_id *id) +{ + struct aaci *aaci; + int ret, i; + + ret = amba_request_regions(dev, NULL); + if (ret) + return ret; + + aaci = aaci_init_card(dev); + if (!aaci) { + ret = -ENOMEM; + goto out; + } + + aaci->base = ioremap(dev->res.start, resource_size(&dev->res)); + if (!aaci->base) { + ret = -ENOMEM; + goto out; + } + + /* + * Playback uses AACI channel 0 + */ + spin_lock_init(&aaci->playback.lock); + aaci->playback.base = aaci->base + AACI_CSCH1; + aaci->playback.fifo = aaci->base + AACI_DR1; + + /* + * Capture uses AACI channel 0 + */ + spin_lock_init(&aaci->capture.lock); + aaci->capture.base = aaci->base + AACI_CSCH1; + aaci->capture.fifo = aaci->base + AACI_DR1; + + for (i = 0; i < 4; i++) { + void __iomem *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); + /* + * Fix: ac97 read back fail errors by reading + * from any arbitrary aaci register. + */ + readl(aaci->base + AACI_CSCH1); + ret = aaci_probe_ac97(aaci); + if (ret) + goto out; + + /* + * Size the FIFOs (must be multiple of 16). + * This is the number of entries in the FIFO. + */ + aaci->fifo_depth = aaci_size_fifo(aaci); + if (aaci->fifo_depth & 15) { + printk(KERN_WARNING "AACI: FIFO depth %d not supported\n", + aaci->fifo_depth); + ret = -ENODEV; + 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\n", aaci->card->longname); + dev_info(&dev->dev, "FIFO %u entries\n", aaci->fifo_depth); + amba_set_drvdata(dev, aaci->card); + return ret; + } + + out: + if (aaci) + snd_card_free(aaci->card); + amba_release_regions(dev); + return ret; +} + +static int aaci_remove(struct amba_device *dev) +{ + struct snd_card *card = amba_get_drvdata(dev); + + 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 }, +}; + +MODULE_DEVICE_TABLE(amba, aaci_ids); + +static struct amba_driver aaci_driver = { + .drv = { + .name = DRIVER_NAME, + .pm = AACI_DEV_PM_OPS, + }, + .probe = aaci_probe, + .remove = aaci_remove, + .id_table = aaci_ids, +}; + +module_amba_driver(aaci_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("ARM PrimeCell PL041 Advanced Audio CODEC Interface driver"); |