2 * PC-Speaker driver for Linux
4 * Copyright (C) 1993-1997 Michael Beck
5 * Copyright (C) 1997-2001 David Woodhouse
6 * Copyright (C) 2001-2008 Stas Sergeev
12 #include <linux/hrtimer.h>
13 #if defined(CONFIG_MIPS) || defined(CONFIG_X86)
14 /* Use the global PIT lock ! */
15 #include <asm/i8253.h>
17 #include <asm/8253pit.h>
18 static DEFINE_SPINLOCK(i8253_lock);
21 #define PCSP_SOUND_VERSION 0x400 /* read 4.00 */
24 /* default timer freq for PC-Speaker: 18643 Hz */
26 #define MAX_DIV DIV_18KHZ
27 #define CALC_DIV(d) (MAX_DIV >> (d))
28 #define CUR_DIV() CALC_DIV(chip->treble)
29 #define PCSP_MAX_TREBLE 1
31 /* unfortunately, with hrtimers 37KHz does not work very well :( */
32 #define PCSP_DEFAULT_TREBLE 0
33 #define MIN_DIV (MAX_DIV >> PCSP_MAX_TREBLE)
36 #define PCSP_MIN_LPJ 1000000
37 #define PCSP_DEFAULT_SDIV (DIV_18KHZ >> 1)
38 #define PCSP_DEFAULT_SRATE (PIT_TICK_RATE / PCSP_DEFAULT_SDIV)
39 #define PCSP_INDEX_INC() (1 << (PCSP_MAX_TREBLE - chip->treble))
40 #define PCSP_CALC_RATE(i) (PIT_TICK_RATE / CALC_DIV(i))
41 #define PCSP_RATE() PCSP_CALC_RATE(chip->treble)
42 #define PCSP_MIN_RATE__1 MAX_DIV/PIT_TICK_RATE
43 #define PCSP_MAX_RATE__1 MIN_DIV/PIT_TICK_RATE
44 #define PCSP_MAX_PERIOD_NS (1000000000ULL * PCSP_MIN_RATE__1)
45 #define PCSP_MIN_PERIOD_NS (1000000000ULL * PCSP_MAX_RATE__1)
46 #define PCSP_CALC_NS(div) ({ \
47 u64 __val = 1000000000ULL * (div); \
48 do_div(__val, PIT_TICK_RATE); \
51 #define PCSP_PERIOD_NS() PCSP_CALC_NS(CUR_DIV())
53 #define PCSP_MAX_PERIOD_SIZE (64*1024)
54 #define PCSP_MAX_PERIODS 512
55 #define PCSP_BUFFER_SIZE (128*1024)
58 struct snd_card *card;
60 struct input_dev *input_dev;
62 unsigned short port, irq, dma;
63 spinlock_t substream_lock;
64 struct snd_pcm_substream *playback_substream;
65 unsigned int fmt_size;
66 unsigned int is_signed;
69 atomic_t timer_active;
79 extern struct snd_pcsp pcsp_chip;
81 extern enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle);
82 extern void pcsp_sync_stop(struct snd_pcsp *chip);
84 extern int snd_pcsp_new_pcm(struct snd_pcsp *chip);
85 extern int snd_pcsp_new_mixer(struct snd_pcsp *chip);