eea0579fc8
With the callback mode HRTIMER_CB_IRQSAFE_UNLOCK, the start of the stream with zero delay doesn't work. Since IRQSAFE mode is removed, we have to change the pcsp start-up code. This patch splits the callback function to two parts, the triggering of the port and the calculation of the expire time, and the update of the ALSA PCM core. The first part is called both from the trigger-start and the hrtimer callback while the latter is handled only in the hrtimer callback. Signed-off-by: Takashi Iwai <tiwai@suse.de>
356 lines
9 KiB
C
356 lines
9 KiB
C
/*
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* PC-Speaker driver for Linux
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*
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* Copyright (C) 1993-1997 Michael Beck
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* Copyright (C) 1997-2001 David Woodhouse
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* Copyright (C) 2001-2008 Stas Sergeev
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/interrupt.h>
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#include <sound/pcm.h>
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#include <asm/io.h>
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#include "pcsp.h"
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static int nforce_wa;
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module_param(nforce_wa, bool, 0444);
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MODULE_PARM_DESC(nforce_wa, "Apply NForce chipset workaround "
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"(expect bad sound)");
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#define DMIX_WANTS_S16 1
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/*
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* Call snd_pcm_period_elapsed in a tasklet
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* This avoids spinlock messes and long-running irq contexts
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*/
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static void pcsp_call_pcm_elapsed(unsigned long priv)
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{
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if (atomic_read(&pcsp_chip.timer_active)) {
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struct snd_pcm_substream *substream;
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substream = pcsp_chip.playback_substream;
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if (substream)
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snd_pcm_period_elapsed(substream);
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}
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}
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static DECLARE_TASKLET(pcsp_pcm_tasklet, pcsp_call_pcm_elapsed, 0);
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/* write the port and returns the next expire time in ns;
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* called at the trigger-start and in hrtimer callback
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*/
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static unsigned long pcsp_timer_update(struct hrtimer *handle)
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{
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unsigned char timer_cnt, val;
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u64 ns;
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struct snd_pcm_substream *substream;
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struct snd_pcm_runtime *runtime;
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struct snd_pcsp *chip = container_of(handle, struct snd_pcsp, timer);
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unsigned long flags;
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if (chip->thalf) {
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outb(chip->val61, 0x61);
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chip->thalf = 0;
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if (!atomic_read(&chip->timer_active))
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return 0;
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return chip->ns_rem;
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}
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if (!atomic_read(&chip->timer_active))
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return 0;
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substream = chip->playback_substream;
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if (!substream)
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return 0;
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runtime = substream->runtime;
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/* assume it is mono! */
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val = runtime->dma_area[chip->playback_ptr + chip->fmt_size - 1];
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if (chip->is_signed)
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val ^= 0x80;
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timer_cnt = val * CUR_DIV() / 256;
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if (timer_cnt && chip->enable) {
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spin_lock_irqsave(&i8253_lock, flags);
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if (!nforce_wa) {
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outb_p(chip->val61, 0x61);
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outb_p(timer_cnt, 0x42);
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outb(chip->val61 ^ 1, 0x61);
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} else {
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outb(chip->val61 ^ 2, 0x61);
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chip->thalf = 1;
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}
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spin_unlock_irqrestore(&i8253_lock, flags);
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}
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chip->ns_rem = PCSP_PERIOD_NS();
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ns = (chip->thalf ? PCSP_CALC_NS(timer_cnt) : chip->ns_rem);
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chip->ns_rem -= ns;
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return ns;
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}
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enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
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{
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struct snd_pcsp *chip = container_of(handle, struct snd_pcsp, timer);
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struct snd_pcm_substream *substream;
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int periods_elapsed, pointer_update;
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size_t period_bytes, buffer_bytes;
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unsigned long ns;
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unsigned long flags;
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pointer_update = !chip->thalf;
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ns = pcsp_timer_update(handle);
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if (!ns)
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return HRTIMER_NORESTART;
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/* update the playback position */
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substream = chip->playback_substream;
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if (!substream)
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return HRTIMER_NORESTART;
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period_bytes = snd_pcm_lib_period_bytes(substream);
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buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
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spin_lock_irqsave(&chip->substream_lock, flags);
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chip->playback_ptr += PCSP_INDEX_INC() * chip->fmt_size;
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periods_elapsed = chip->playback_ptr - chip->period_ptr;
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if (periods_elapsed < 0) {
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#if PCSP_DEBUG
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printk(KERN_INFO "PCSP: buffer_bytes mod period_bytes != 0 ? "
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"(%zi %zi %zi)\n",
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chip->playback_ptr, period_bytes, buffer_bytes);
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#endif
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periods_elapsed += buffer_bytes;
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}
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periods_elapsed /= period_bytes;
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/* wrap the pointer _before_ calling snd_pcm_period_elapsed(),
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* or ALSA will BUG on us. */
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chip->playback_ptr %= buffer_bytes;
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if (periods_elapsed) {
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chip->period_ptr += periods_elapsed * period_bytes;
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chip->period_ptr %= buffer_bytes;
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}
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spin_unlock_irqrestore(&chip->substream_lock, flags);
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if (periods_elapsed)
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tasklet_schedule(&pcsp_pcm_tasklet);
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hrtimer_forward(handle, hrtimer_get_expires(handle), ns_to_ktime(ns));
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return HRTIMER_RESTART;
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}
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static int pcsp_start_playing(struct snd_pcsp *chip)
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{
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unsigned long ns;
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#if PCSP_DEBUG
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printk(KERN_INFO "PCSP: start_playing called\n");
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#endif
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if (atomic_read(&chip->timer_active)) {
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printk(KERN_ERR "PCSP: Timer already active\n");
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return -EIO;
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}
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spin_lock(&i8253_lock);
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chip->val61 = inb(0x61) | 0x03;
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outb_p(0x92, 0x43); /* binary, mode 1, LSB only, ch 2 */
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spin_unlock(&i8253_lock);
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atomic_set(&chip->timer_active, 1);
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chip->thalf = 0;
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ns = pcsp_timer_update(&pcsp_chip.timer);
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if (!ns)
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return -EIO;
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hrtimer_start(&pcsp_chip.timer, ktime_set(0, ns), HRTIMER_MODE_REL);
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return 0;
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}
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static void pcsp_stop_playing(struct snd_pcsp *chip)
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{
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#if PCSP_DEBUG
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printk(KERN_INFO "PCSP: stop_playing called\n");
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#endif
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if (!atomic_read(&chip->timer_active))
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return;
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atomic_set(&chip->timer_active, 0);
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spin_lock(&i8253_lock);
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/* restore the timer */
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outb_p(0xb6, 0x43); /* binary, mode 3, LSB/MSB, ch 2 */
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outb(chip->val61 & 0xFC, 0x61);
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spin_unlock(&i8253_lock);
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}
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/*
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* Force to stop and sync the stream
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*/
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void pcsp_sync_stop(struct snd_pcsp *chip)
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{
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local_irq_disable();
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pcsp_stop_playing(chip);
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local_irq_enable();
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hrtimer_cancel(&chip->timer);
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tasklet_kill(&pcsp_pcm_tasklet);
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}
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static int snd_pcsp_playback_close(struct snd_pcm_substream *substream)
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{
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struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
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#if PCSP_DEBUG
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printk(KERN_INFO "PCSP: close called\n");
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#endif
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pcsp_sync_stop(chip);
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chip->playback_substream = NULL;
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return 0;
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}
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static int snd_pcsp_playback_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *hw_params)
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{
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struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
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int err;
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pcsp_sync_stop(chip);
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err = snd_pcm_lib_malloc_pages(substream,
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params_buffer_bytes(hw_params));
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if (err < 0)
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return err;
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return 0;
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}
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static int snd_pcsp_playback_hw_free(struct snd_pcm_substream *substream)
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{
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struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
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#if PCSP_DEBUG
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printk(KERN_INFO "PCSP: hw_free called\n");
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#endif
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pcsp_sync_stop(chip);
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return snd_pcm_lib_free_pages(substream);
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}
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static int snd_pcsp_playback_prepare(struct snd_pcm_substream *substream)
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{
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struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
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#if PCSP_DEBUG
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printk(KERN_INFO "PCSP: prepare called, "
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"size=%zi psize=%zi f=%zi f1=%i\n",
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snd_pcm_lib_buffer_bytes(substream),
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snd_pcm_lib_period_bytes(substream),
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snd_pcm_lib_buffer_bytes(substream) /
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snd_pcm_lib_period_bytes(substream),
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substream->runtime->periods);
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#endif
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pcsp_sync_stop(chip);
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chip->playback_ptr = 0;
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chip->period_ptr = 0;
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chip->fmt_size =
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snd_pcm_format_physical_width(substream->runtime->format) >> 3;
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chip->is_signed = snd_pcm_format_signed(substream->runtime->format);
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return 0;
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}
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static int snd_pcsp_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
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#if PCSP_DEBUG
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printk(KERN_INFO "PCSP: trigger called\n");
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#endif
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_RESUME:
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return pcsp_start_playing(chip);
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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pcsp_stop_playing(chip);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static snd_pcm_uframes_t snd_pcsp_playback_pointer(struct snd_pcm_substream
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*substream)
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{
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struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
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unsigned int pos;
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spin_lock(&chip->substream_lock);
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pos = chip->playback_ptr;
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spin_unlock(&chip->substream_lock);
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return bytes_to_frames(substream->runtime, pos);
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}
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static struct snd_pcm_hardware snd_pcsp_playback = {
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.info = (SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_HALF_DUPLEX |
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SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
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.formats = (SNDRV_PCM_FMTBIT_U8
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#if DMIX_WANTS_S16
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| SNDRV_PCM_FMTBIT_S16_LE
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#endif
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),
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.rates = SNDRV_PCM_RATE_KNOT,
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.rate_min = PCSP_DEFAULT_SRATE,
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.rate_max = PCSP_DEFAULT_SRATE,
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.channels_min = 1,
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.channels_max = 1,
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.buffer_bytes_max = PCSP_BUFFER_SIZE,
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.period_bytes_min = 64,
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.period_bytes_max = PCSP_MAX_PERIOD_SIZE,
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.periods_min = 2,
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.periods_max = PCSP_MAX_PERIODS,
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.fifo_size = 0,
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};
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static int snd_pcsp_playback_open(struct snd_pcm_substream *substream)
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{
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struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
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struct snd_pcm_runtime *runtime = substream->runtime;
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#if PCSP_DEBUG
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printk(KERN_INFO "PCSP: open called\n");
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#endif
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if (atomic_read(&chip->timer_active)) {
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printk(KERN_ERR "PCSP: still active!!\n");
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return -EBUSY;
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}
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runtime->hw = snd_pcsp_playback;
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chip->playback_substream = substream;
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return 0;
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}
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static struct snd_pcm_ops snd_pcsp_playback_ops = {
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.open = snd_pcsp_playback_open,
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.close = snd_pcsp_playback_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = snd_pcsp_playback_hw_params,
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.hw_free = snd_pcsp_playback_hw_free,
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.prepare = snd_pcsp_playback_prepare,
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.trigger = snd_pcsp_trigger,
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.pointer = snd_pcsp_playback_pointer,
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};
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int __devinit snd_pcsp_new_pcm(struct snd_pcsp *chip)
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{
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int err;
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err = snd_pcm_new(chip->card, "pcspeaker", 0, 1, 0, &chip->pcm);
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if (err < 0)
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return err;
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snd_pcm_set_ops(chip->pcm, SNDRV_PCM_STREAM_PLAYBACK,
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&snd_pcsp_playback_ops);
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chip->pcm->private_data = chip;
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chip->pcm->info_flags = SNDRV_PCM_INFO_HALF_DUPLEX;
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strcpy(chip->pcm->name, "pcsp");
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snd_pcm_lib_preallocate_pages_for_all(chip->pcm,
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SNDRV_DMA_TYPE_CONTINUOUS,
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snd_dma_continuous_data
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(GFP_KERNEL), PCSP_BUFFER_SIZE,
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PCSP_BUFFER_SIZE);
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return 0;
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}
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