diff options
Diffstat (limited to '')
| -rw-r--r-- | sound/pci/sis7019.c | 1404 |
1 files changed, 1404 insertions, 0 deletions
diff --git a/sound/pci/sis7019.c b/sound/pci/sis7019.c new file mode 100644 index 0000000000..fabe393607 --- /dev/null +++ b/sound/pci/sis7019.c @@ -0,0 +1,1404 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Driver for SiS7019 Audio Accelerator + * + * Copyright (C) 2004-2007, David Dillow + * Written by David Dillow <dave@thedillows.org> + * Inspired by the Trident 4D-WaveDX/NX driver. + * + * All rights reserved. + */ + +#include <linux/init.h> +#include <linux/pci.h> +#include <linux/time.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <sound/core.h> +#include <sound/ac97_codec.h> +#include <sound/initval.h> +#include "sis7019.h" + +MODULE_AUTHOR("David Dillow <dave@thedillows.org>"); +MODULE_DESCRIPTION("SiS7019"); +MODULE_LICENSE("GPL"); + +static int index = SNDRV_DEFAULT_IDX1; /* Index 0-MAX */ +static char *id = SNDRV_DEFAULT_STR1; /* ID for this card */ +static bool enable = 1; +static int codecs = 1; + +module_param(index, int, 0444); +MODULE_PARM_DESC(index, "Index value for SiS7019 Audio Accelerator."); +module_param(id, charp, 0444); +MODULE_PARM_DESC(id, "ID string for SiS7019 Audio Accelerator."); +module_param(enable, bool, 0444); +MODULE_PARM_DESC(enable, "Enable SiS7019 Audio Accelerator."); +module_param(codecs, int, 0444); +MODULE_PARM_DESC(codecs, "Set bit to indicate that codec number is expected to be present (default 1)"); + +static const struct pci_device_id snd_sis7019_ids[] = { + { PCI_DEVICE(PCI_VENDOR_ID_SI, 0x7019) }, + { 0, } +}; + +MODULE_DEVICE_TABLE(pci, snd_sis7019_ids); + +/* There are three timing modes for the voices. + * + * For both playback and capture, when the buffer is one or two periods long, + * we use the hardware's built-in Mid-Loop Interrupt and End-Loop Interrupt + * to let us know when the periods have ended. + * + * When performing playback with more than two periods per buffer, we set + * the "Stop Sample Offset" and tell the hardware to interrupt us when we + * reach it. We then update the offset and continue on until we are + * interrupted for the next period. + * + * Capture channels do not have a SSO, so we allocate a playback channel to + * use as a timer for the capture periods. We use the SSO on the playback + * channel to clock out virtual periods, and adjust the virtual period length + * to maintain synchronization. This algorithm came from the Trident driver. + * + * FIXME: It'd be nice to make use of some of the synth features in the + * hardware, but a woeful lack of documentation is a significant roadblock. + */ +struct voice { + u16 flags; +#define VOICE_IN_USE 1 +#define VOICE_CAPTURE 2 +#define VOICE_SSO_TIMING 4 +#define VOICE_SYNC_TIMING 8 + u16 sync_cso; + u16 period_size; + u16 buffer_size; + u16 sync_period_size; + u16 sync_buffer_size; + u32 sso; + u32 vperiod; + struct snd_pcm_substream *substream; + struct voice *timing; + void __iomem *ctrl_base; + void __iomem *wave_base; + void __iomem *sync_base; + int num; +}; + +/* We need four pages to store our wave parameters during a suspend. If + * we're not doing power management, we still need to allocate a page + * for the silence buffer. + */ +#ifdef CONFIG_PM_SLEEP +#define SIS_SUSPEND_PAGES 4 +#else +#define SIS_SUSPEND_PAGES 1 +#endif + +struct sis7019 { + unsigned long ioport; + void __iomem *ioaddr; + int irq; + int codecs_present; + + struct pci_dev *pci; + struct snd_pcm *pcm; + struct snd_card *card; + struct snd_ac97 *ac97[3]; + + /* Protect against more than one thread hitting the AC97 + * registers (in a more polite manner than pounding the hardware + * semaphore) + */ + struct mutex ac97_mutex; + + /* voice_lock protects allocation/freeing of the voice descriptions + */ + spinlock_t voice_lock; + + struct voice voices[64]; + struct voice capture_voice; + + /* Allocate pages to store the internal wave state during + * suspends. When we're operating, this can be used as a silence + * buffer for a timing channel. + */ + void *suspend_state[SIS_SUSPEND_PAGES]; + + int silence_users; + dma_addr_t silence_dma_addr; +}; + +/* These values are also used by the module param 'codecs' to indicate + * which codecs should be present. + */ +#define SIS_PRIMARY_CODEC_PRESENT 0x0001 +#define SIS_SECONDARY_CODEC_PRESENT 0x0002 +#define SIS_TERTIARY_CODEC_PRESENT 0x0004 + +/* The HW offset parameters (Loop End, Stop Sample, End Sample) have a + * documented range of 8-0xfff8 samples. Given that they are 0-based, + * that places our period/buffer range at 9-0xfff9 samples. That makes the + * max buffer size 0xfff9 samples * 2 channels * 2 bytes per sample, and + * max samples / min samples gives us the max periods in a buffer. + * + * We'll add a constraint upon open that limits the period and buffer sample + * size to values that are legal for the hardware. + */ +static const struct snd_pcm_hardware sis_playback_hw_info = { + .info = (SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID | + SNDRV_PCM_INFO_INTERLEAVED | + SNDRV_PCM_INFO_BLOCK_TRANSFER | + SNDRV_PCM_INFO_SYNC_START | + SNDRV_PCM_INFO_RESUME), + .formats = (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 | + SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_U16_LE), + .rates = SNDRV_PCM_RATE_8000_48000 | SNDRV_PCM_RATE_CONTINUOUS, + .rate_min = 4000, + .rate_max = 48000, + .channels_min = 1, + .channels_max = 2, + .buffer_bytes_max = (0xfff9 * 4), + .period_bytes_min = 9, + .period_bytes_max = (0xfff9 * 4), + .periods_min = 1, + .periods_max = (0xfff9 / 9), +}; + +static const struct snd_pcm_hardware sis_capture_hw_info = { + .info = (SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID | + SNDRV_PCM_INFO_INTERLEAVED | + SNDRV_PCM_INFO_BLOCK_TRANSFER | + SNDRV_PCM_INFO_SYNC_START | + SNDRV_PCM_INFO_RESUME), + .formats = (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 | + SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_U16_LE), + .rates = SNDRV_PCM_RATE_48000, + .rate_min = 4000, + .rate_max = 48000, + .channels_min = 1, + .channels_max = 2, + .buffer_bytes_max = (0xfff9 * 4), + .period_bytes_min = 9, + .period_bytes_max = (0xfff9 * 4), + .periods_min = 1, + .periods_max = (0xfff9 / 9), +}; + +static void sis_update_sso(struct voice *voice, u16 period) +{ + void __iomem *base = voice->ctrl_base; + + voice->sso += period; + if (voice->sso >= voice->buffer_size) + voice->sso -= voice->buffer_size; + + /* Enforce the documented hardware minimum offset */ + if (voice->sso < 8) + voice->sso = 8; + + /* The SSO is in the upper 16 bits of the register. */ + writew(voice->sso & 0xffff, base + SIS_PLAY_DMA_SSO_ESO + 2); +} + +static void sis_update_voice(struct voice *voice) +{ + if (voice->flags & VOICE_SSO_TIMING) { + sis_update_sso(voice, voice->period_size); + } else if (voice->flags & VOICE_SYNC_TIMING) { + int sync; + + /* If we've not hit the end of the virtual period, update + * our records and keep going. + */ + if (voice->vperiod > voice->period_size) { + voice->vperiod -= voice->period_size; + if (voice->vperiod < voice->period_size) + sis_update_sso(voice, voice->vperiod); + else + sis_update_sso(voice, voice->period_size); + return; + } + + /* Calculate our relative offset between the target and + * the actual CSO value. Since we're operating in a loop, + * if the value is more than half way around, we can + * consider ourselves wrapped. + */ + sync = voice->sync_cso; + sync -= readw(voice->sync_base + SIS_CAPTURE_DMA_FORMAT_CSO); + if (sync > (voice->sync_buffer_size / 2)) + sync -= voice->sync_buffer_size; + + /* If sync is positive, then we interrupted too early, and + * we'll need to come back in a few samples and try again. + * There's a minimum wait, as it takes some time for the DMA + * engine to startup, etc... + */ + if (sync > 0) { + if (sync < 16) + sync = 16; + sis_update_sso(voice, sync); + return; + } + + /* Ok, we interrupted right on time, or (hopefully) just + * a bit late. We'll adjst our next waiting period based + * on how close we got. + * + * We need to stay just behind the actual channel to ensure + * it really is past a period when we get our interrupt -- + * otherwise we'll fall into the early code above and have + * a minimum wait time, which makes us quite late here, + * eating into the user's time to refresh the buffer, esp. + * if using small periods. + * + * If we're less than 9 samples behind, we're on target. + * Otherwise, shorten the next vperiod by the amount we've + * been delayed. + */ + if (sync > -9) + voice->vperiod = voice->sync_period_size + 1; + else + voice->vperiod = voice->sync_period_size + sync + 10; + + if (voice->vperiod < voice->buffer_size) { + sis_update_sso(voice, voice->vperiod); + voice->vperiod = 0; + } else + sis_update_sso(voice, voice->period_size); + + sync = voice->sync_cso + voice->sync_period_size; + if (sync >= voice->sync_buffer_size) + sync -= voice->sync_buffer_size; + voice->sync_cso = sync; + } + + snd_pcm_period_elapsed(voice->substream); +} + +static void sis_voice_irq(u32 status, struct voice *voice) +{ + int bit; + + while (status) { + bit = __ffs(status); + status >>= bit + 1; + voice += bit; + sis_update_voice(voice); + voice++; + } +} + +static irqreturn_t sis_interrupt(int irq, void *dev) +{ + struct sis7019 *sis = dev; + unsigned long io = sis->ioport; + struct voice *voice; + u32 intr, status; + + /* We only use the DMA interrupts, and we don't enable any other + * source of interrupts. But, it is possible to see an interrupt + * status that didn't actually interrupt us, so eliminate anything + * we're not expecting to avoid falsely claiming an IRQ, and an + * ensuing endless loop. + */ + intr = inl(io + SIS_GISR); + intr &= SIS_GISR_AUDIO_PLAY_DMA_IRQ_STATUS | + SIS_GISR_AUDIO_RECORD_DMA_IRQ_STATUS; + if (!intr) + return IRQ_NONE; + + do { + status = inl(io + SIS_PISR_A); + if (status) { + sis_voice_irq(status, sis->voices); + outl(status, io + SIS_PISR_A); + } + + status = inl(io + SIS_PISR_B); + if (status) { + sis_voice_irq(status, &sis->voices[32]); + outl(status, io + SIS_PISR_B); + } + + status = inl(io + SIS_RISR); + if (status) { + voice = &sis->capture_voice; + if (!voice->timing) + snd_pcm_period_elapsed(voice->substream); + + outl(status, io + SIS_RISR); + } + + outl(intr, io + SIS_GISR); + intr = inl(io + SIS_GISR); + intr &= SIS_GISR_AUDIO_PLAY_DMA_IRQ_STATUS | + SIS_GISR_AUDIO_RECORD_DMA_IRQ_STATUS; + } while (intr); + + return IRQ_HANDLED; +} + +static u32 sis_rate_to_delta(unsigned int rate) +{ + u32 delta; + + /* This was copied from the trident driver, but it seems its gotten + * around a bit... nevertheless, it works well. + * + * We special case 44100 and 8000 since rounding with the equation + * does not give us an accurate enough value. For 11025 and 22050 + * the equation gives us the best answer. All other frequencies will + * also use the equation. JDW + */ + if (rate == 44100) + delta = 0xeb3; + else if (rate == 8000) + delta = 0x2ab; + else if (rate == 48000) + delta = 0x1000; + else + delta = DIV_ROUND_CLOSEST(rate << 12, 48000) & 0x0000ffff; + return delta; +} + +static void __sis_map_silence(struct sis7019 *sis) +{ + /* Helper function: must hold sis->voice_lock on entry */ + if (!sis->silence_users) + sis->silence_dma_addr = dma_map_single(&sis->pci->dev, + sis->suspend_state[0], + 4096, DMA_TO_DEVICE); + sis->silence_users++; +} + +static void __sis_unmap_silence(struct sis7019 *sis) +{ + /* Helper function: must hold sis->voice_lock on entry */ + sis->silence_users--; + if (!sis->silence_users) + dma_unmap_single(&sis->pci->dev, sis->silence_dma_addr, 4096, + DMA_TO_DEVICE); +} + +static void sis_free_voice(struct sis7019 *sis, struct voice *voice) +{ + unsigned long flags; + + spin_lock_irqsave(&sis->voice_lock, flags); + if (voice->timing) { + __sis_unmap_silence(sis); + voice->timing->flags &= ~(VOICE_IN_USE | VOICE_SSO_TIMING | + VOICE_SYNC_TIMING); + voice->timing = NULL; + } + voice->flags &= ~(VOICE_IN_USE | VOICE_SSO_TIMING | VOICE_SYNC_TIMING); + spin_unlock_irqrestore(&sis->voice_lock, flags); +} + +static struct voice *__sis_alloc_playback_voice(struct sis7019 *sis) +{ + /* Must hold the voice_lock on entry */ + struct voice *voice; + int i; + + for (i = 0; i < 64; i++) { + voice = &sis->voices[i]; + if (voice->flags & VOICE_IN_USE) + continue; + voice->flags |= VOICE_IN_USE; + goto found_one; + } + voice = NULL; + +found_one: + return voice; +} + +static struct voice *sis_alloc_playback_voice(struct sis7019 *sis) +{ + struct voice *voice; + unsigned long flags; + + spin_lock_irqsave(&sis->voice_lock, flags); + voice = __sis_alloc_playback_voice(sis); + spin_unlock_irqrestore(&sis->voice_lock, flags); + + return voice; +} + +static int sis_alloc_timing_voice(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *hw_params) +{ + struct sis7019 *sis = snd_pcm_substream_chip(substream); + struct snd_pcm_runtime *runtime = substream->runtime; + struct voice *voice = runtime->private_data; + unsigned int period_size, buffer_size; + unsigned long flags; + int needed; + + /* If there are one or two periods per buffer, we don't need a + * timing voice, as we can use the capture channel's interrupts + * to clock out the periods. + */ + period_size = params_period_size(hw_params); + buffer_size = params_buffer_size(hw_params); + needed = (period_size != buffer_size && + period_size != (buffer_size / 2)); + + if (needed && !voice->timing) { + spin_lock_irqsave(&sis->voice_lock, flags); + voice->timing = __sis_alloc_playback_voice(sis); + if (voice->timing) + __sis_map_silence(sis); + spin_unlock_irqrestore(&sis->voice_lock, flags); + if (!voice->timing) + return -ENOMEM; + voice->timing->substream = substream; + } else if (!needed && voice->timing) { + sis_free_voice(sis, voice); + voice->timing = NULL; + } + + return 0; +} + +static int sis_playback_open(struct snd_pcm_substream *substream) +{ + struct sis7019 *sis = snd_pcm_substream_chip(substream); + struct snd_pcm_runtime *runtime = substream->runtime; + struct voice *voice; + + voice = sis_alloc_playback_voice(sis); + if (!voice) + return -EAGAIN; + + voice->substream = substream; + runtime->private_data = voice; + runtime->hw = sis_playback_hw_info; + snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, + 9, 0xfff9); + snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, + 9, 0xfff9); + snd_pcm_set_sync(substream); + return 0; +} + +static int sis_substream_close(struct snd_pcm_substream *substream) +{ + struct sis7019 *sis = snd_pcm_substream_chip(substream); + struct snd_pcm_runtime *runtime = substream->runtime; + struct voice *voice = runtime->private_data; + + sis_free_voice(sis, voice); + return 0; +} + +static int sis_pcm_playback_prepare(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct voice *voice = runtime->private_data; + void __iomem *ctrl_base = voice->ctrl_base; + void __iomem *wave_base = voice->wave_base; + u32 format, dma_addr, control, sso_eso, delta, reg; + u16 leo; + + /* We rely on the PCM core to ensure that the parameters for this + * substream do not change on us while we're programming the HW. + */ + format = 0; + if (snd_pcm_format_width(runtime->format) == 8) + format |= SIS_PLAY_DMA_FORMAT_8BIT; + if (!snd_pcm_format_signed(runtime->format)) + format |= SIS_PLAY_DMA_FORMAT_UNSIGNED; + if (runtime->channels == 1) + format |= SIS_PLAY_DMA_FORMAT_MONO; + + /* The baseline setup is for a single period per buffer, and + * we add bells and whistles as needed from there. + */ + dma_addr = runtime->dma_addr; + leo = runtime->buffer_size - 1; + control = leo | SIS_PLAY_DMA_LOOP | SIS_PLAY_DMA_INTR_AT_LEO; + sso_eso = leo; + + if (runtime->period_size == (runtime->buffer_size / 2)) { + control |= SIS_PLAY_DMA_INTR_AT_MLP; + } else if (runtime->period_size != runtime->buffer_size) { + voice->flags |= VOICE_SSO_TIMING; + voice->sso = runtime->period_size - 1; + voice->period_size = runtime->period_size; + voice->buffer_size = runtime->buffer_size; + + control &= ~SIS_PLAY_DMA_INTR_AT_LEO; + control |= SIS_PLAY_DMA_INTR_AT_SSO; + sso_eso |= (runtime->period_size - 1) << 16; + } + + delta = sis_rate_to_delta(runtime->rate); + + /* Ok, we're ready to go, set up the channel. + */ + writel(format, ctrl_base + SIS_PLAY_DMA_FORMAT_CSO); + writel(dma_addr, ctrl_base + SIS_PLAY_DMA_BASE); + writel(control, ctrl_base + SIS_PLAY_DMA_CONTROL); + writel(sso_eso, ctrl_base + SIS_PLAY_DMA_SSO_ESO); + + for (reg = 0; reg < SIS_WAVE_SIZE; reg += 4) + writel(0, wave_base + reg); + + writel(SIS_WAVE_GENERAL_WAVE_VOLUME, wave_base + SIS_WAVE_GENERAL); + writel(delta << 16, wave_base + SIS_WAVE_GENERAL_ARTICULATION); + writel(SIS_WAVE_CHANNEL_CONTROL_FIRST_SAMPLE | + SIS_WAVE_CHANNEL_CONTROL_AMP_ENABLE | + SIS_WAVE_CHANNEL_CONTROL_INTERPOLATE_ENABLE, + wave_base + SIS_WAVE_CHANNEL_CONTROL); + + /* Force PCI writes to post. */ + readl(ctrl_base); + + return 0; +} + +static int sis_pcm_trigger(struct snd_pcm_substream *substream, int cmd) +{ + struct sis7019 *sis = snd_pcm_substream_chip(substream); + unsigned long io = sis->ioport; + struct snd_pcm_substream *s; + struct voice *voice; + void *chip; + int starting; + u32 record = 0; + u32 play[2] = { 0, 0 }; + + /* No locks needed, as the PCM core will hold the locks on the + * substreams, and the HW will only start/stop the indicated voices + * without changing the state of the others. + */ + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + case SNDRV_PCM_TRIGGER_RESUME: + starting = 1; + break; + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + case SNDRV_PCM_TRIGGER_SUSPEND: + starting = 0; + break; + default: + return -EINVAL; + } + + snd_pcm_group_for_each_entry(s, substream) { + /* Make sure it is for us... */ + chip = snd_pcm_substream_chip(s); + if (chip != sis) + continue; + + voice = s->runtime->private_data; + if (voice->flags & VOICE_CAPTURE) { + record |= 1 << voice->num; + voice = voice->timing; + } + + /* voice could be NULL if this a recording stream, and it + * doesn't have an external timing channel. + */ + if (voice) + play[voice->num / 32] |= 1 << (voice->num & 0x1f); + + snd_pcm_trigger_done(s, substream); + } + + if (starting) { + if (record) + outl(record, io + SIS_RECORD_START_REG); + if (play[0]) + outl(play[0], io + SIS_PLAY_START_A_REG); + if (play[1]) + outl(play[1], io + SIS_PLAY_START_B_REG); + } else { + if (record) + outl(record, io + SIS_RECORD_STOP_REG); + if (play[0]) + outl(play[0], io + SIS_PLAY_STOP_A_REG); + if (play[1]) + outl(play[1], io + SIS_PLAY_STOP_B_REG); + } + return 0; +} + +static snd_pcm_uframes_t sis_pcm_pointer(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct voice *voice = runtime->private_data; + u32 cso; + + cso = readl(voice->ctrl_base + SIS_PLAY_DMA_FORMAT_CSO); + cso &= 0xffff; + return cso; +} + +static int sis_capture_open(struct snd_pcm_substream *substream) +{ + struct sis7019 *sis = snd_pcm_substream_chip(substream); + struct snd_pcm_runtime *runtime = substream->runtime; + struct voice *voice = &sis->capture_voice; + unsigned long flags; + + /* FIXME: The driver only supports recording from one channel + * at the moment, but it could support more. + */ + spin_lock_irqsave(&sis->voice_lock, flags); + if (voice->flags & VOICE_IN_USE) + voice = NULL; + else + voice->flags |= VOICE_IN_USE; + spin_unlock_irqrestore(&sis->voice_lock, flags); + + if (!voice) + return -EAGAIN; + + voice->substream = substream; + runtime->private_data = voice; + runtime->hw = sis_capture_hw_info; + runtime->hw.rates = sis->ac97[0]->rates[AC97_RATES_ADC]; + snd_pcm_limit_hw_rates(runtime); + snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, + 9, 0xfff9); + snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, + 9, 0xfff9); + snd_pcm_set_sync(substream); + return 0; +} + +static int sis_capture_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *hw_params) +{ + struct sis7019 *sis = snd_pcm_substream_chip(substream); + int rc; + + rc = snd_ac97_set_rate(sis->ac97[0], AC97_PCM_LR_ADC_RATE, + params_rate(hw_params)); + if (rc) + goto out; + + rc = sis_alloc_timing_voice(substream, hw_params); + +out: + return rc; +} + +static void sis_prepare_timing_voice(struct voice *voice, + struct snd_pcm_substream *substream) +{ + struct sis7019 *sis = snd_pcm_substream_chip(substream); + struct snd_pcm_runtime *runtime = substream->runtime; + struct voice *timing = voice->timing; + void __iomem *play_base = timing->ctrl_base; + void __iomem *wave_base = timing->wave_base; + u16 buffer_size, period_size; + u32 format, control, sso_eso, delta; + u32 vperiod, sso, reg; + + /* Set our initial buffer and period as large as we can given a + * single page of silence. + */ + buffer_size = 4096 / runtime->channels; + buffer_size /= snd_pcm_format_size(runtime->format, 1); + period_size = buffer_size; + + /* Initially, we want to interrupt just a bit behind the end of + * the period we're clocking out. 12 samples seems to give a good + * delay. + * + * We want to spread our interrupts throughout the virtual period, + * so that we don't end up with two interrupts back to back at the + * end -- this helps minimize the effects of any jitter. Adjust our + * clocking period size so that the last period is at least a fourth + * of a full period. + * + * This is all moot if we don't need to use virtual periods. + */ + vperiod = runtime->period_size + 12; + if (vperiod > period_size) { + u16 tail = vperiod % period_size; + u16 quarter_period = period_size / 4; + + if (tail && tail < quarter_period) { + u16 loops = vperiod / period_size; + + tail = quarter_period - tail; + tail += loops - 1; + tail /= loops; + period_size -= tail; + } + + sso = period_size - 1; + } else { + /* The initial period will fit inside the buffer, so we + * don't need to use virtual periods -- disable them. + */ + period_size = runtime->period_size; + sso = vperiod - 1; + vperiod = 0; + } + + /* The interrupt handler implements the timing synchronization, so + * setup its state. + */ + timing->flags |= VOICE_SYNC_TIMING; + timing->sync_base = voice->ctrl_base; + timing->sync_cso = runtime->period_size; + timing->sync_period_size = runtime->period_size; + timing->sync_buffer_size = runtime->buffer_size; + timing->period_size = period_size; + timing->buffer_size = buffer_size; + timing->sso = sso; + timing->vperiod = vperiod; + + /* Using unsigned samples with the all-zero silence buffer + * forces the output to the lower rail, killing playback. + * So ignore unsigned vs signed -- it doesn't change the timing. + */ + format = 0; + if (snd_pcm_format_width(runtime->format) == 8) + format = SIS_CAPTURE_DMA_FORMAT_8BIT; + if (runtime->channels == 1) + format |= SIS_CAPTURE_DMA_FORMAT_MONO; + + control = timing->buffer_size - 1; + control |= SIS_PLAY_DMA_LOOP | SIS_PLAY_DMA_INTR_AT_SSO; + sso_eso = timing->buffer_size - 1; + sso_eso |= timing->sso << 16; + + delta = sis_rate_to_delta(runtime->rate); + + /* We've done the math, now configure the channel. + */ + writel(format, play_base + SIS_PLAY_DMA_FORMAT_CSO); + writel(sis->silence_dma_addr, play_base + SIS_PLAY_DMA_BASE); + writel(control, play_base + SIS_PLAY_DMA_CONTROL); + writel(sso_eso, play_base + SIS_PLAY_DMA_SSO_ESO); + + for (reg = 0; reg < SIS_WAVE_SIZE; reg += 4) + writel(0, wave_base + reg); + + writel(SIS_WAVE_GENERAL_WAVE_VOLUME, wave_base + SIS_WAVE_GENERAL); + writel(delta << 16, wave_base + SIS_WAVE_GENERAL_ARTICULATION); + writel(SIS_WAVE_CHANNEL_CONTROL_FIRST_SAMPLE | + SIS_WAVE_CHANNEL_CONTROL_AMP_ENABLE | + SIS_WAVE_CHANNEL_CONTROL_INTERPOLATE_ENABLE, + wave_base + SIS_WAVE_CHANNEL_CONTROL); +} + +static int sis_pcm_capture_prepare(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct voice *voice = runtime->private_data; + void __iomem *rec_base = voice->ctrl_base; + u32 format, dma_addr, control; + u16 leo; + + /* We rely on the PCM core to ensure that the parameters for this + * substream do not change on us while we're programming the HW. + */ + format = 0; + if (snd_pcm_format_width(runtime->format) == 8) + format = SIS_CAPTURE_DMA_FORMAT_8BIT; + if (!snd_pcm_format_signed(runtime->format)) + format |= SIS_CAPTURE_DMA_FORMAT_UNSIGNED; + if (runtime->channels == 1) + format |= SIS_CAPTURE_DMA_FORMAT_MONO; + + dma_addr = runtime->dma_addr; + leo = runtime->buffer_size - 1; + control = leo | SIS_CAPTURE_DMA_LOOP; + + /* If we've got more than two periods per buffer, then we have + * use a timing voice to clock out the periods. Otherwise, we can + * use the capture channel's interrupts. + */ + if (voice->timing) { + sis_prepare_timing_voice(voice, substream); + } else { + control |= SIS_CAPTURE_DMA_INTR_AT_LEO; + if (runtime->period_size != runtime->buffer_size) + control |= SIS_CAPTURE_DMA_INTR_AT_MLP; + } + + writel(format, rec_base + SIS_CAPTURE_DMA_FORMAT_CSO); + writel(dma_addr, rec_base + SIS_CAPTURE_DMA_BASE); + writel(control, rec_base + SIS_CAPTURE_DMA_CONTROL); + + /* Force the writes to post. */ + readl(rec_base); + + return 0; +} + +static const struct snd_pcm_ops sis_playback_ops = { + .open = sis_playback_open, + .close = sis_substream_close, + .prepare = sis_pcm_playback_prepare, + .trigger = sis_pcm_trigger, + .pointer = sis_pcm_pointer, +}; + +static const struct snd_pcm_ops sis_capture_ops = { + .open = sis_capture_open, + .close = sis_substream_close, + .hw_params = sis_capture_hw_params, + .prepare = sis_pcm_capture_prepare, + .trigger = sis_pcm_trigger, + .pointer = sis_pcm_pointer, +}; + +static int sis_pcm_create(struct sis7019 *sis) +{ + struct snd_pcm *pcm; + int rc; + + /* We have 64 voices, and the driver currently records from + * only one channel, though that could change in the future. + */ + rc = snd_pcm_new(sis->card, "SiS7019", 0, 64, 1, &pcm); + if (rc) + return rc; + + pcm->private_data = sis; + strcpy(pcm->name, "SiS7019"); + sis->pcm = pcm; + + snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &sis_playback_ops); + snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &sis_capture_ops); + + /* Try to preallocate some memory, but it's not the end of the + * world if this fails. + */ + snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV, + &sis->pci->dev, 64*1024, 128*1024); + + return 0; +} + +static unsigned short sis_ac97_rw(struct sis7019 *sis, int codec, u32 cmd) +{ + unsigned long io = sis->ioport; + unsigned short val = 0xffff; + u16 status; + u16 rdy; + int count; + static const u16 codec_ready[3] = { + SIS_AC97_STATUS_CODEC_READY, + SIS_AC97_STATUS_CODEC2_READY, + SIS_AC97_STATUS_CODEC3_READY, + }; + + rdy = codec_ready[codec]; + + + /* Get the AC97 semaphore -- software first, so we don't spin + * pounding out IO reads on the hardware semaphore... + */ + mutex_lock(&sis->ac97_mutex); + + count = 0xffff; + while ((inw(io + SIS_AC97_SEMA) & SIS_AC97_SEMA_BUSY) && --count) + udelay(1); + + if (!count) + goto timeout; + + /* ... and wait for any outstanding commands to complete ... + */ + count = 0xffff; + do { + status = inw(io + SIS_AC97_STATUS); + if ((status & rdy) && !(status & SIS_AC97_STATUS_BUSY)) + break; + + udelay(1); + } while (--count); + + if (!count) + goto timeout_sema; + + /* ... before sending our command and waiting for it to finish ... + */ + outl(cmd, io + SIS_AC97_CMD); + udelay(10); + + count = 0xffff; + while ((inw(io + SIS_AC97_STATUS) & SIS_AC97_STATUS_BUSY) && --count) + udelay(1); + + /* ... and reading the results (if any). + */ + val = inl(io + SIS_AC97_CMD) >> 16; + +timeout_sema: + outl(SIS_AC97_SEMA_RELEASE, io + SIS_AC97_SEMA); +timeout: + mutex_unlock(&sis->ac97_mutex); + + if (!count) { + dev_err(&sis->pci->dev, "ac97 codec %d timeout cmd 0x%08x\n", + codec, cmd); + } + + return val; +} + +static void sis_ac97_write(struct snd_ac97 *ac97, unsigned short reg, + unsigned short val) +{ + static const u32 cmd[3] = { + SIS_AC97_CMD_CODEC_WRITE, + SIS_AC97_CMD_CODEC2_WRITE, + SIS_AC97_CMD_CODEC3_WRITE, + }; + sis_ac97_rw(ac97->private_data, ac97->num, + (val << 16) | (reg << 8) | cmd[ac97->num]); +} + +static unsigned short sis_ac97_read(struct snd_ac97 *ac97, unsigned short reg) +{ + static const u32 cmd[3] = { + SIS_AC97_CMD_CODEC_READ, + SIS_AC97_CMD_CODEC2_READ, + SIS_AC97_CMD_CODEC3_READ, + }; + return sis_ac97_rw(ac97->private_data, ac97->num, + (reg << 8) | cmd[ac97->num]); +} + +static int sis_mixer_create(struct sis7019 *sis) +{ + struct snd_ac97_bus *bus; + struct snd_ac97_template ac97; + static const struct snd_ac97_bus_ops ops = { + .write = sis_ac97_write, + .read = sis_ac97_read, + }; + int rc; + + memset(&ac97, 0, sizeof(ac97)); + ac97.private_data = sis; + + rc = snd_ac97_bus(sis->card, 0, &ops, NULL, &bus); + if (!rc && sis->codecs_present & SIS_PRIMARY_CODEC_PRESENT) + rc = snd_ac97_mixer(bus, &ac97, &sis->ac97[0]); + ac97.num = 1; + if (!rc && (sis->codecs_present & SIS_SECONDARY_CODEC_PRESENT)) + rc = snd_ac97_mixer(bus, &ac97, &sis->ac97[1]); + ac97.num = 2; + if (!rc && (sis->codecs_present & SIS_TERTIARY_CODEC_PRESENT)) + rc = snd_ac97_mixer(bus, &ac97, &sis->ac97[2]); + + /* If we return an error here, then snd_card_free() should + * free up any ac97 codecs that got created, as well as the bus. + */ + return rc; +} + +static void sis_chip_free(struct snd_card *card) +{ + struct sis7019 *sis = card->private_data; + + /* Reset the chip, and disable all interrputs. + */ + outl(SIS_GCR_SOFTWARE_RESET, sis->ioport + SIS_GCR); + udelay(25); + outl(0, sis->ioport + SIS_GCR); + outl(0, sis->ioport + SIS_GIER); + + /* Now, free everything we allocated. + */ + if (sis->irq >= 0) + free_irq(sis->irq, sis); +} + +static int sis_chip_init(struct sis7019 *sis) +{ + unsigned long io = sis->ioport; + void __iomem *ioaddr = sis->ioaddr; + unsigned long timeout; + u16 status; + int count; + int i; + + /* Reset the audio controller + */ + outl(SIS_GCR_SOFTWARE_RESET, io + SIS_GCR); + udelay(25); + outl(0, io + SIS_GCR); + + /* Get the AC-link semaphore, and reset the codecs + */ + count = 0xffff; + while ((inw(io + SIS_AC97_SEMA) & SIS_AC97_SEMA_BUSY) && --count) + udelay(1); + + if (!count) + return -EIO; + + outl(SIS_AC97_CMD_CODEC_COLD_RESET, io + SIS_AC97_CMD); + udelay(250); + + count = 0xffff; + while ((inw(io + SIS_AC97_STATUS) & SIS_AC97_STATUS_BUSY) && --count) + udelay(1); + + /* Command complete, we can let go of the semaphore now. + */ + outl(SIS_AC97_SEMA_RELEASE, io + SIS_AC97_SEMA); + if (!count) + return -EIO; + + /* Now that we've finished the reset, find out what's attached. + * There are some codec/board combinations that take an extremely + * long time to come up. 350+ ms has been observed in the field, + * so we'll give them up to 500ms. + */ + sis->codecs_present = 0; + timeout = msecs_to_jiffies(500) + jiffies; + while (time_before_eq(jiffies, timeout)) { + status = inl(io + SIS_AC97_STATUS); + if (status & SIS_AC97_STATUS_CODEC_READY) + sis->codecs_present |= SIS_PRIMARY_CODEC_PRESENT; + if (status & SIS_AC97_STATUS_CODEC2_READY) + sis->codecs_present |= SIS_SECONDARY_CODEC_PRESENT; + if (status & SIS_AC97_STATUS_CODEC3_READY) + sis->codecs_present |= SIS_TERTIARY_CODEC_PRESENT; + + if (sis->codecs_present == codecs) + break; + + msleep(1); + } + + /* All done, check for errors. + */ + if (!sis->codecs_present) { + dev_err(&sis->pci->dev, "could not find any codecs\n"); + return -EIO; + } + + if (sis->codecs_present != codecs) { + dev_warn(&sis->pci->dev, "missing codecs, found %0x, expected %0x\n", + sis->codecs_present, codecs); + } + + /* Let the hardware know that the audio driver is alive, + * and enable PCM slots on the AC-link for L/R playback (3 & 4) and + * record channels. We're going to want to use Variable Rate Audio + * for recording, to avoid needlessly resampling from 48kHZ. + */ + outl(SIS_AC97_CONF_AUDIO_ALIVE, io + SIS_AC97_CONF); + outl(SIS_AC97_CONF_AUDIO_ALIVE | SIS_AC97_CONF_PCM_LR_ENABLE | + SIS_AC97_CONF_PCM_CAP_MIC_ENABLE | + SIS_AC97_CONF_PCM_CAP_LR_ENABLE | + SIS_AC97_CONF_CODEC_VRA_ENABLE, io + SIS_AC97_CONF); + + /* All AC97 PCM slots should be sourced from sub-mixer 0. + */ + outl(0, io + SIS_AC97_PSR); + + /* There is only one valid DMA setup for a PCI environment. + */ + outl(SIS_DMA_CSR_PCI_SETTINGS, io + SIS_DMA_CSR); + + /* Reset the synchronization groups for all of the channels + * to be asynchronous. If we start doing SPDIF or 5.1 sound, etc. + * we'll need to change how we handle these. Until then, we just + * assign sub-mixer 0 to all playback channels, and avoid any + * attenuation on the audio. + */ + outl(0, io + SIS_PLAY_SYNC_GROUP_A); + outl(0, io + SIS_PLAY_SYNC_GROUP_B); + outl(0, io + SIS_PLAY_SYNC_GROUP_C); + outl(0, io + SIS_PLAY_SYNC_GROUP_D); + outl(0, io + SIS_MIXER_SYNC_GROUP); + + for (i = 0; i < 64; i++) { + writel(i, SIS_MIXER_START_ADDR(ioaddr, i)); + writel(SIS_MIXER_RIGHT_NO_ATTEN | SIS_MIXER_LEFT_NO_ATTEN | + SIS_MIXER_DEST_0, SIS_MIXER_ADDR(ioaddr, i)); + } + + /* Don't attenuate any audio set for the wave amplifier. + * + * FIXME: Maximum attenuation is set for the music amp, which will + * need to change if we start using the synth engine. + */ + outl(0xffff0000, io + SIS_WEVCR); + + /* Ensure that the wave engine is in normal operating mode. + */ + outl(0, io + SIS_WECCR); + + /* Go ahead and enable the DMA interrupts. They won't go live + * until we start a channel. + */ + outl(SIS_GIER_AUDIO_PLAY_DMA_IRQ_ENABLE | + SIS_GIER_AUDIO_RECORD_DMA_IRQ_ENABLE, io + SIS_GIER); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int sis_suspend(struct device *dev) +{ + struct snd_card *card = dev_get_drvdata(dev); + struct sis7019 *sis = card->private_data; + void __iomem *ioaddr = sis->ioaddr; + int i; + + snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); + if (sis->codecs_present & SIS_PRIMARY_CODEC_PRESENT) + snd_ac97_suspend(sis->ac97[0]); + if (sis->codecs_present & SIS_SECONDARY_CODEC_PRESENT) + snd_ac97_suspend(sis->ac97[1]); + if (sis->codecs_present & SIS_TERTIARY_CODEC_PRESENT) + snd_ac97_suspend(sis->ac97[2]); + + /* snd_pcm_suspend_all() stopped all channels, so we're quiescent. + */ + if (sis->irq >= 0) { + free_irq(sis->irq, sis); + sis->irq = -1; + } + + /* Save the internal state away + */ + for (i = 0; i < 4; i++) { + memcpy_fromio(sis->suspend_state[i], ioaddr, 4096); + ioaddr += 4096; + } + + return 0; +} + +static int sis_resume(struct device *dev) +{ + struct pci_dev *pci = to_pci_dev(dev); + struct snd_card *card = dev_get_drvdata(dev); + struct sis7019 *sis = card->private_data; + void __iomem *ioaddr = sis->ioaddr; + int i; + + if (sis_chip_init(sis)) { + dev_err(&pci->dev, "unable to re-init controller\n"); + goto error; + } + + if (request_irq(pci->irq, sis_interrupt, IRQF_SHARED, + KBUILD_MODNAME, sis)) { + dev_err(&pci->dev, "unable to regain IRQ %d\n", pci->irq); + goto error; + } + + /* Restore saved state, then clear out the page we use for the + * silence buffer. + */ + for (i = 0; i < 4; i++) { + memcpy_toio(ioaddr, sis->suspend_state[i], 4096); + ioaddr += 4096; + } + + memset(sis->suspend_state[0], 0, 4096); + + sis->irq = pci->irq; + + if (sis->codecs_present & SIS_PRIMARY_CODEC_PRESENT) + snd_ac97_resume(sis->ac97[0]); + if (sis->codecs_present & SIS_SECONDARY_CODEC_PRESENT) + snd_ac97_resume(sis->ac97[1]); + if (sis->codecs_present & SIS_TERTIARY_CODEC_PRESENT) + snd_ac97_resume(sis->ac97[2]); + + snd_power_change_state(card, SNDRV_CTL_POWER_D0); + return 0; + +error: + snd_card_disconnect(card); + return -EIO; +} + +static SIMPLE_DEV_PM_OPS(sis_pm, sis_suspend, sis_resume); +#define SIS_PM_OPS &sis_pm +#else +#define SIS_PM_OPS NULL +#endif /* CONFIG_PM_SLEEP */ + +static int sis_alloc_suspend(struct sis7019 *sis) +{ + int i; + + /* We need 16K to store the internal wave engine state during a + * suspend, but we don't need it to be contiguous, so play nice + * with the memory system. We'll also use this area for a silence + * buffer. + */ + for (i = 0; i < SIS_SUSPEND_PAGES; i++) { + sis->suspend_state[i] = devm_kmalloc(&sis->pci->dev, 4096, + GFP_KERNEL); + if (!sis->suspend_state[i]) + return -ENOMEM; + } + memset(sis->suspend_state[0], 0, 4096); + + return 0; +} + +static int sis_chip_create(struct snd_card *card, + struct pci_dev *pci) +{ + struct sis7019 *sis = card->private_data; + struct voice *voice; + int rc; + int i; + + rc = pcim_enable_device(pci); + if (rc) + return rc; + + rc = dma_set_mask(&pci->dev, DMA_BIT_MASK(30)); + if (rc < 0) { + dev_err(&pci->dev, "architecture does not support 30-bit PCI busmaster DMA"); + return -ENXIO; + } + + mutex_init(&sis->ac97_mutex); + spin_lock_init(&sis->voice_lock); + sis->card = card; + sis->pci = pci; + sis->irq = -1; + sis->ioport = pci_resource_start(pci, 0); + + rc = pci_request_regions(pci, "SiS7019"); + if (rc) { + dev_err(&pci->dev, "unable request regions\n"); + return rc; + } + + sis->ioaddr = devm_ioremap(&pci->dev, pci_resource_start(pci, 1), 0x4000); + if (!sis->ioaddr) { + dev_err(&pci->dev, "unable to remap MMIO, aborting\n"); + return -EIO; + } + + rc = sis_alloc_suspend(sis); + if (rc < 0) { + dev_err(&pci->dev, "unable to allocate state storage\n"); + return rc; + } + + rc = sis_chip_init(sis); + if (rc) + return rc; + card->private_free = sis_chip_free; + + rc = request_irq(pci->irq, sis_interrupt, IRQF_SHARED, KBUILD_MODNAME, + sis); + if (rc) { + dev_err(&pci->dev, "unable to allocate irq %d\n", sis->irq); + return rc; + } + + sis->irq = pci->irq; + card->sync_irq = sis->irq; + pci_set_master(pci); + + for (i = 0; i < 64; i++) { + voice = &sis->voices[i]; + voice->num = i; + voice->ctrl_base = SIS_PLAY_DMA_ADDR(sis->ioaddr, i); + voice->wave_base = SIS_WAVE_ADDR(sis->ioaddr, i); + } + + voice = &sis->capture_voice; + voice->flags = VOICE_CAPTURE; + voice->num = SIS_CAPTURE_CHAN_AC97_PCM_IN; + voice->ctrl_base = SIS_CAPTURE_DMA_ADDR(sis->ioaddr, voice->num); + + return 0; +} + +static int __snd_sis7019_probe(struct pci_dev *pci, + const struct pci_device_id *pci_id) +{ + struct snd_card *card; + struct sis7019 *sis; + int rc; + + if (!enable) + return -ENOENT; + + /* The user can specify which codecs should be present so that we + * can wait for them to show up if they are slow to recover from + * the AC97 cold reset. We default to a single codec, the primary. + * + * We assume that SIS_PRIMARY_*_PRESENT matches bits 0-2. + */ + codecs &= SIS_PRIMARY_CODEC_PRESENT | SIS_SECONDARY_CODEC_PRESENT | + SIS_TERTIARY_CODEC_PRESENT; + if (!codecs) + codecs = SIS_PRIMARY_CODEC_PRESENT; + + rc = snd_devm_card_new(&pci->dev, index, id, THIS_MODULE, + sizeof(*sis), &card); + if (rc < 0) + return rc; + + strcpy(card->driver, "SiS7019"); + strcpy(card->shortname, "SiS7019"); + rc = sis_chip_create(card, pci); + if (rc) + return rc; + + sis = card->private_data; + + rc = sis_mixer_create(sis); + if (rc) + return rc; + + rc = sis_pcm_create(sis); + if (rc) + return rc; + + snprintf(card->longname, sizeof(card->longname), + "%s Audio Accelerator with %s at 0x%lx, irq %d", + card->shortname, snd_ac97_get_short_name(sis->ac97[0]), + sis->ioport, sis->irq); + + rc = snd_card_register(card); + if (rc) + return rc; + + pci_set_drvdata(pci, card); + return 0; +} + +static int snd_sis7019_probe(struct pci_dev *pci, + const struct pci_device_id *pci_id) +{ + return snd_card_free_on_error(&pci->dev, __snd_sis7019_probe(pci, pci_id)); +} + +static struct pci_driver sis7019_driver = { + .name = KBUILD_MODNAME, + .id_table = snd_sis7019_ids, + .probe = snd_sis7019_probe, + .driver = { + .pm = SIS_PM_OPS, + }, +}; + +module_pci_driver(sis7019_driver); |