diff options
Diffstat (limited to 'sound/oss/dmasound/dmasound_paula.c')
| -rw-r--r-- | sound/oss/dmasound/dmasound_paula.c | 740 |
1 files changed, 740 insertions, 0 deletions
diff --git a/sound/oss/dmasound/dmasound_paula.c b/sound/oss/dmasound/dmasound_paula.c new file mode 100644 index 0000000..06e9e88 --- /dev/null +++ b/sound/oss/dmasound/dmasound_paula.c @@ -0,0 +1,740 @@ +/* + * linux/sound/oss/dmasound/dmasound_paula.c + * + * Amiga `Paula' DMA Sound Driver + * + * See linux/sound/oss/dmasound/dmasound_core.c for copyright and credits + * prior to 28/01/2001 + * + * 28/01/2001 [0.1] Iain Sandoe + * - added versioning + * - put in and populated the hardware_afmts field. + * [0.2] - put in SNDCTL_DSP_GETCAPS value. + * [0.3] - put in constraint on state buffer usage. + * [0.4] - put in default hard/soft settings +*/ + + +#include <linux/module.h> +#include <linux/mm.h> +#include <linux/init.h> +#include <linux/ioport.h> +#include <linux/soundcard.h> +#include <linux/interrupt.h> + +#include <asm/uaccess.h> +#include <asm/setup.h> +#include <asm/amigahw.h> +#include <asm/amigaints.h> +#include <asm/machdep.h> + +#include "dmasound.h" + +#define DMASOUND_PAULA_REVISION 0 +#define DMASOUND_PAULA_EDITION 4 + +#define custom amiga_custom + /* + * The minimum period for audio depends on htotal (for OCS/ECS/AGA) + * (Imported from arch/m68k/amiga/amisound.c) + */ + +extern volatile u_short amiga_audio_min_period; + + + /* + * amiga_mksound() should be able to restore the period after beeping + * (Imported from arch/m68k/amiga/amisound.c) + */ + +extern u_short amiga_audio_period; + + + /* + * Audio DMA masks + */ + +#define AMI_AUDIO_OFF (DMAF_AUD0 | DMAF_AUD1 | DMAF_AUD2 | DMAF_AUD3) +#define AMI_AUDIO_8 (DMAF_SETCLR | DMAF_MASTER | DMAF_AUD0 | DMAF_AUD1) +#define AMI_AUDIO_14 (AMI_AUDIO_8 | DMAF_AUD2 | DMAF_AUD3) + + + /* + * Helper pointers for 16(14)-bit sound + */ + +static int write_sq_block_size_half, write_sq_block_size_quarter; + + +/*** Low level stuff *********************************************************/ + + +static void *AmiAlloc(unsigned int size, gfp_t flags); +static void AmiFree(void *obj, unsigned int size); +static int AmiIrqInit(void); +#ifdef MODULE +static void AmiIrqCleanUp(void); +#endif +static void AmiSilence(void); +static void AmiInit(void); +static int AmiSetFormat(int format); +static int AmiSetVolume(int volume); +static int AmiSetTreble(int treble); +static void AmiPlayNextFrame(int index); +static void AmiPlay(void); +static irqreturn_t AmiInterrupt(int irq, void *dummy); + +#ifdef CONFIG_HEARTBEAT + + /* + * Heartbeat interferes with sound since the 7 kHz low-pass filter and the + * power LED are controlled by the same line. + */ + +static void (*saved_heartbeat)(int) = NULL; + +static inline void disable_heartbeat(void) +{ + if (mach_heartbeat) { + saved_heartbeat = mach_heartbeat; + mach_heartbeat = NULL; + } + AmiSetTreble(dmasound.treble); +} + +static inline void enable_heartbeat(void) +{ + if (saved_heartbeat) + mach_heartbeat = saved_heartbeat; +} +#else /* !CONFIG_HEARTBEAT */ +#define disable_heartbeat() do { } while (0) +#define enable_heartbeat() do { } while (0) +#endif /* !CONFIG_HEARTBEAT */ + + +/*** Mid level stuff *********************************************************/ + +static void AmiMixerInit(void); +static int AmiMixerIoctl(u_int cmd, u_long arg); +static int AmiWriteSqSetup(void); +static int AmiStateInfo(char *buffer, size_t space); + + +/*** Translations ************************************************************/ + +/* ++TeSche: radically changed for new expanding purposes... + * + * These two routines now deal with copying/expanding/translating the samples + * from user space into our buffer at the right frequency. They take care about + * how much data there's actually to read, how much buffer space there is and + * to convert samples into the right frequency/encoding. They will only work on + * complete samples so it may happen they leave some bytes in the input stream + * if the user didn't write a multiple of the current sample size. They both + * return the number of bytes they've used from both streams so you may detect + * such a situation. Luckily all programs should be able to cope with that. + * + * I think I've optimized anything as far as one can do in plain C, all + * variables should fit in registers and the loops are really short. There's + * one loop for every possible situation. Writing a more generalized and thus + * parameterized loop would only produce slower code. Feel free to optimize + * this in assembler if you like. :) + * + * I think these routines belong here because they're not yet really hardware + * independent, especially the fact that the Falcon can play 16bit samples + * only in stereo is hardcoded in both of them! + * + * ++geert: split in even more functions (one per format) + */ + + + /* + * Native format + */ + +static ssize_t ami_ct_s8(const u_char __user *userPtr, size_t userCount, + u_char frame[], ssize_t *frameUsed, ssize_t frameLeft) +{ + ssize_t count, used; + + if (!dmasound.soft.stereo) { + void *p = &frame[*frameUsed]; + count = min_t(unsigned long, userCount, frameLeft) & ~1; + used = count; + if (copy_from_user(p, userPtr, count)) + return -EFAULT; + } else { + u_char *left = &frame[*frameUsed>>1]; + u_char *right = left+write_sq_block_size_half; + count = min_t(unsigned long, userCount, frameLeft)>>1 & ~1; + used = count*2; + while (count > 0) { + if (get_user(*left++, userPtr++) + || get_user(*right++, userPtr++)) + return -EFAULT; + count--; + } + } + *frameUsed += used; + return used; +} + + + /* + * Copy and convert 8 bit data + */ + +#define GENERATE_AMI_CT8(funcname, convsample) \ +static ssize_t funcname(const u_char __user *userPtr, size_t userCount, \ + u_char frame[], ssize_t *frameUsed, \ + ssize_t frameLeft) \ +{ \ + ssize_t count, used; \ + \ + if (!dmasound.soft.stereo) { \ + u_char *p = &frame[*frameUsed]; \ + count = min_t(size_t, userCount, frameLeft) & ~1; \ + used = count; \ + while (count > 0) { \ + u_char data; \ + if (get_user(data, userPtr++)) \ + return -EFAULT; \ + *p++ = convsample(data); \ + count--; \ + } \ + } else { \ + u_char *left = &frame[*frameUsed>>1]; \ + u_char *right = left+write_sq_block_size_half; \ + count = min_t(size_t, userCount, frameLeft)>>1 & ~1; \ + used = count*2; \ + while (count > 0) { \ + u_char data; \ + if (get_user(data, userPtr++)) \ + return -EFAULT; \ + *left++ = convsample(data); \ + if (get_user(data, userPtr++)) \ + return -EFAULT; \ + *right++ = convsample(data); \ + count--; \ + } \ + } \ + *frameUsed += used; \ + return used; \ +} + +#define AMI_CT_ULAW(x) (dmasound_ulaw2dma8[(x)]) +#define AMI_CT_ALAW(x) (dmasound_alaw2dma8[(x)]) +#define AMI_CT_U8(x) ((x) ^ 0x80) + +GENERATE_AMI_CT8(ami_ct_ulaw, AMI_CT_ULAW) +GENERATE_AMI_CT8(ami_ct_alaw, AMI_CT_ALAW) +GENERATE_AMI_CT8(ami_ct_u8, AMI_CT_U8) + + + /* + * Copy and convert 16 bit data + */ + +#define GENERATE_AMI_CT_16(funcname, convsample) \ +static ssize_t funcname(const u_char __user *userPtr, size_t userCount, \ + u_char frame[], ssize_t *frameUsed, \ + ssize_t frameLeft) \ +{ \ + const u_short __user *ptr = (const u_short __user *)userPtr; \ + ssize_t count, used; \ + u_short data; \ + \ + if (!dmasound.soft.stereo) { \ + u_char *high = &frame[*frameUsed>>1]; \ + u_char *low = high+write_sq_block_size_half; \ + count = min_t(size_t, userCount, frameLeft)>>1 & ~1; \ + used = count*2; \ + while (count > 0) { \ + if (get_user(data, ptr++)) \ + return -EFAULT; \ + data = convsample(data); \ + *high++ = data>>8; \ + *low++ = (data>>2) & 0x3f; \ + count--; \ + } \ + } else { \ + u_char *lefth = &frame[*frameUsed>>2]; \ + u_char *leftl = lefth+write_sq_block_size_quarter; \ + u_char *righth = lefth+write_sq_block_size_half; \ + u_char *rightl = righth+write_sq_block_size_quarter; \ + count = min_t(size_t, userCount, frameLeft)>>2 & ~1; \ + used = count*4; \ + while (count > 0) { \ + if (get_user(data, ptr++)) \ + return -EFAULT; \ + data = convsample(data); \ + *lefth++ = data>>8; \ + *leftl++ = (data>>2) & 0x3f; \ + if (get_user(data, ptr++)) \ + return -EFAULT; \ + data = convsample(data); \ + *righth++ = data>>8; \ + *rightl++ = (data>>2) & 0x3f; \ + count--; \ + } \ + } \ + *frameUsed += used; \ + return used; \ +} + +#define AMI_CT_S16BE(x) (x) +#define AMI_CT_U16BE(x) ((x) ^ 0x8000) +#define AMI_CT_S16LE(x) (le2be16((x))) +#define AMI_CT_U16LE(x) (le2be16((x)) ^ 0x8000) + +GENERATE_AMI_CT_16(ami_ct_s16be, AMI_CT_S16BE) +GENERATE_AMI_CT_16(ami_ct_u16be, AMI_CT_U16BE) +GENERATE_AMI_CT_16(ami_ct_s16le, AMI_CT_S16LE) +GENERATE_AMI_CT_16(ami_ct_u16le, AMI_CT_U16LE) + + +static TRANS transAmiga = { + .ct_ulaw = ami_ct_ulaw, + .ct_alaw = ami_ct_alaw, + .ct_s8 = ami_ct_s8, + .ct_u8 = ami_ct_u8, + .ct_s16be = ami_ct_s16be, + .ct_u16be = ami_ct_u16be, + .ct_s16le = ami_ct_s16le, + .ct_u16le = ami_ct_u16le, +}; + +/*** Low level stuff *********************************************************/ + +static inline void StopDMA(void) +{ + custom.aud[0].audvol = custom.aud[1].audvol = 0; + custom.aud[2].audvol = custom.aud[3].audvol = 0; + custom.dmacon = AMI_AUDIO_OFF; + enable_heartbeat(); +} + +static void *AmiAlloc(unsigned int size, gfp_t flags) +{ + return amiga_chip_alloc((long)size, "dmasound [Paula]"); +} + +static void AmiFree(void *obj, unsigned int size) +{ + amiga_chip_free (obj); +} + +static int __init AmiIrqInit(void) +{ + /* turn off DMA for audio channels */ + StopDMA(); + + /* Register interrupt handler. */ + if (request_irq(IRQ_AMIGA_AUD0, AmiInterrupt, 0, "DMA sound", + AmiInterrupt)) + return 0; + return 1; +} + +#ifdef MODULE +static void AmiIrqCleanUp(void) +{ + /* turn off DMA for audio channels */ + StopDMA(); + /* release the interrupt */ + free_irq(IRQ_AMIGA_AUD0, AmiInterrupt); +} +#endif /* MODULE */ + +static void AmiSilence(void) +{ + /* turn off DMA for audio channels */ + StopDMA(); +} + + +static void AmiInit(void) +{ + int period, i; + + AmiSilence(); + + if (dmasound.soft.speed) + period = amiga_colorclock/dmasound.soft.speed-1; + else + period = amiga_audio_min_period; + dmasound.hard = dmasound.soft; + dmasound.trans_write = &transAmiga; + + if (period < amiga_audio_min_period) { + /* we would need to squeeze the sound, but we won't do that */ + period = amiga_audio_min_period; + } else if (period > 65535) { + period = 65535; + } + dmasound.hard.speed = amiga_colorclock/(period+1); + + for (i = 0; i < 4; i++) + custom.aud[i].audper = period; + amiga_audio_period = period; +} + + +static int AmiSetFormat(int format) +{ + int size; + + /* Amiga sound DMA supports 8bit and 16bit (pseudo 14 bit) modes */ + + switch (format) { + case AFMT_QUERY: + return dmasound.soft.format; + case AFMT_MU_LAW: + case AFMT_A_LAW: + case AFMT_U8: + case AFMT_S8: + size = 8; + break; + case AFMT_S16_BE: + case AFMT_U16_BE: + case AFMT_S16_LE: + case AFMT_U16_LE: + size = 16; + break; + default: /* :-) */ + size = 8; + format = AFMT_S8; + } + + dmasound.soft.format = format; + dmasound.soft.size = size; + if (dmasound.minDev == SND_DEV_DSP) { + dmasound.dsp.format = format; + dmasound.dsp.size = dmasound.soft.size; + } + AmiInit(); + + return format; +} + + +#define VOLUME_VOXWARE_TO_AMI(v) \ + (((v) < 0) ? 0 : ((v) > 100) ? 64 : ((v) * 64)/100) +#define VOLUME_AMI_TO_VOXWARE(v) ((v)*100/64) + +static int AmiSetVolume(int volume) +{ + dmasound.volume_left = VOLUME_VOXWARE_TO_AMI(volume & 0xff); + custom.aud[0].audvol = dmasound.volume_left; + dmasound.volume_right = VOLUME_VOXWARE_TO_AMI((volume & 0xff00) >> 8); + custom.aud[1].audvol = dmasound.volume_right; + if (dmasound.hard.size == 16) { + if (dmasound.volume_left == 64 && dmasound.volume_right == 64) { + custom.aud[2].audvol = 1; + custom.aud[3].audvol = 1; + } else { + custom.aud[2].audvol = 0; + custom.aud[3].audvol = 0; + } + } + return VOLUME_AMI_TO_VOXWARE(dmasound.volume_left) | + (VOLUME_AMI_TO_VOXWARE(dmasound.volume_right) << 8); +} + +static int AmiSetTreble(int treble) +{ + dmasound.treble = treble; + if (treble < 50) + ciaa.pra &= ~0x02; + else + ciaa.pra |= 0x02; + return treble; +} + + +#define AMI_PLAY_LOADED 1 +#define AMI_PLAY_PLAYING 2 +#define AMI_PLAY_MASK 3 + + +static void AmiPlayNextFrame(int index) +{ + u_char *start, *ch0, *ch1, *ch2, *ch3; + u_long size; + + /* used by AmiPlay() if all doubts whether there really is something + * to be played are already wiped out. + */ + start = write_sq.buffers[write_sq.front]; + size = (write_sq.count == index ? write_sq.rear_size + : write_sq.block_size)>>1; + + if (dmasound.hard.stereo) { + ch0 = start; + ch1 = start+write_sq_block_size_half; + size >>= 1; + } else { + ch0 = start; + ch1 = start; + } + + disable_heartbeat(); + custom.aud[0].audvol = dmasound.volume_left; + custom.aud[1].audvol = dmasound.volume_right; + if (dmasound.hard.size == 8) { + custom.aud[0].audlc = (u_short *)ZTWO_PADDR(ch0); + custom.aud[0].audlen = size; + custom.aud[1].audlc = (u_short *)ZTWO_PADDR(ch1); + custom.aud[1].audlen = size; + custom.dmacon = AMI_AUDIO_8; + } else { + size >>= 1; + custom.aud[0].audlc = (u_short *)ZTWO_PADDR(ch0); + custom.aud[0].audlen = size; + custom.aud[1].audlc = (u_short *)ZTWO_PADDR(ch1); + custom.aud[1].audlen = size; + if (dmasound.volume_left == 64 && dmasound.volume_right == 64) { + /* We can play pseudo 14-bit only with the maximum volume */ + ch3 = ch0+write_sq_block_size_quarter; + ch2 = ch1+write_sq_block_size_quarter; + custom.aud[2].audvol = 1; /* we are being affected by the beeps */ + custom.aud[3].audvol = 1; /* restoring volume here helps a bit */ + custom.aud[2].audlc = (u_short *)ZTWO_PADDR(ch2); + custom.aud[2].audlen = size; + custom.aud[3].audlc = (u_short *)ZTWO_PADDR(ch3); + custom.aud[3].audlen = size; + custom.dmacon = AMI_AUDIO_14; + } else { + custom.aud[2].audvol = 0; + custom.aud[3].audvol = 0; + custom.dmacon = AMI_AUDIO_8; + } + } + write_sq.front = (write_sq.front+1) % write_sq.max_count; + write_sq.active |= AMI_PLAY_LOADED; +} + + +static void AmiPlay(void) +{ + int minframes = 1; + + custom.intena = IF_AUD0; + + if (write_sq.active & AMI_PLAY_LOADED) { + /* There's already a frame loaded */ + custom.intena = IF_SETCLR | IF_AUD0; + return; + } + + if (write_sq.active & AMI_PLAY_PLAYING) + /* Increase threshold: frame 1 is already being played */ + minframes = 2; + + if (write_sq.count < minframes) { + /* Nothing to do */ + custom.intena = IF_SETCLR | IF_AUD0; + return; + } + + if (write_sq.count <= minframes && + write_sq.rear_size < write_sq.block_size && !write_sq.syncing) { + /* hmmm, the only existing frame is not + * yet filled and we're not syncing? + */ + custom.intena = IF_SETCLR | IF_AUD0; + return; + } + + AmiPlayNextFrame(minframes); + + custom.intena = IF_SETCLR | IF_AUD0; +} + + +static irqreturn_t AmiInterrupt(int irq, void *dummy) +{ + int minframes = 1; + + custom.intena = IF_AUD0; + + if (!write_sq.active) { + /* Playing was interrupted and sq_reset() has already cleared + * the sq variables, so better don't do anything here. + */ + WAKE_UP(write_sq.sync_queue); + return IRQ_HANDLED; + } + + if (write_sq.active & AMI_PLAY_PLAYING) { + /* We've just finished a frame */ + write_sq.count--; + WAKE_UP(write_sq.action_queue); + } + + if (write_sq.active & AMI_PLAY_LOADED) + /* Increase threshold: frame 1 is already being played */ + minframes = 2; + + /* Shift the flags */ + write_sq.active = (write_sq.active<<1) & AMI_PLAY_MASK; + + if (!write_sq.active) + /* No frame is playing, disable audio DMA */ + StopDMA(); + + custom.intena = IF_SETCLR | IF_AUD0; + + if (write_sq.count >= minframes) + /* Try to play the next frame */ + AmiPlay(); + + if (!write_sq.active) + /* Nothing to play anymore. + Wake up a process waiting for audio output to drain. */ + WAKE_UP(write_sq.sync_queue); + return IRQ_HANDLED; +} + +/*** Mid level stuff *********************************************************/ + + +/* + * /dev/mixer abstraction + */ + +static void __init AmiMixerInit(void) +{ + dmasound.volume_left = 64; + dmasound.volume_right = 64; + custom.aud[0].audvol = dmasound.volume_left; + custom.aud[3].audvol = 1; /* For pseudo 14bit */ + custom.aud[1].audvol = dmasound.volume_right; + custom.aud[2].audvol = 1; /* For pseudo 14bit */ + dmasound.treble = 50; +} + +static int AmiMixerIoctl(u_int cmd, u_long arg) +{ + int data; + switch (cmd) { + case SOUND_MIXER_READ_DEVMASK: + return IOCTL_OUT(arg, SOUND_MASK_VOLUME | SOUND_MASK_TREBLE); + case SOUND_MIXER_READ_RECMASK: + return IOCTL_OUT(arg, 0); + case SOUND_MIXER_READ_STEREODEVS: + return IOCTL_OUT(arg, SOUND_MASK_VOLUME); + case SOUND_MIXER_READ_VOLUME: + return IOCTL_OUT(arg, + VOLUME_AMI_TO_VOXWARE(dmasound.volume_left) | + VOLUME_AMI_TO_VOXWARE(dmasound.volume_right) << 8); + case SOUND_MIXER_WRITE_VOLUME: + IOCTL_IN(arg, data); + return IOCTL_OUT(arg, dmasound_set_volume(data)); + case SOUND_MIXER_READ_TREBLE: + return IOCTL_OUT(arg, dmasound.treble); + case SOUND_MIXER_WRITE_TREBLE: + IOCTL_IN(arg, data); + return IOCTL_OUT(arg, dmasound_set_treble(data)); + } + return -EINVAL; +} + + +static int AmiWriteSqSetup(void) +{ + write_sq_block_size_half = write_sq.block_size>>1; + write_sq_block_size_quarter = write_sq_block_size_half>>1; + return 0; +} + + +static int AmiStateInfo(char *buffer, size_t space) +{ + int len = 0; + len += sprintf(buffer+len, "\tsound.volume_left = %d [0...64]\n", + dmasound.volume_left); + len += sprintf(buffer+len, "\tsound.volume_right = %d [0...64]\n", + dmasound.volume_right); + if (len >= space) { + printk(KERN_ERR "dmasound_paula: overlowed state buffer alloc.\n") ; + len = space ; + } + return len; +} + + +/*** Machine definitions *****************************************************/ + +static SETTINGS def_hard = { + .format = AFMT_S8, + .stereo = 0, + .size = 8, + .speed = 8000 +} ; + +static SETTINGS def_soft = { + .format = AFMT_U8, + .stereo = 0, + .size = 8, + .speed = 8000 +} ; + +static MACHINE machAmiga = { + .name = "Amiga", + .name2 = "AMIGA", + .owner = THIS_MODULE, + .dma_alloc = AmiAlloc, + .dma_free = AmiFree, + .irqinit = AmiIrqInit, +#ifdef MODULE + .irqcleanup = AmiIrqCleanUp, +#endif /* MODULE */ + .init = AmiInit, + .silence = AmiSilence, + .setFormat = AmiSetFormat, + .setVolume = AmiSetVolume, + .setTreble = AmiSetTreble, + .play = AmiPlay, + .mixer_init = AmiMixerInit, + .mixer_ioctl = AmiMixerIoctl, + .write_sq_setup = AmiWriteSqSetup, + .state_info = AmiStateInfo, + .min_dsp_speed = 8000, + .version = ((DMASOUND_PAULA_REVISION<<8) | DMASOUND_PAULA_EDITION), + .hardware_afmts = (AFMT_S8 | AFMT_S16_BE), /* h'ware-supported formats *only* here */ + .capabilities = DSP_CAP_BATCH /* As per SNDCTL_DSP_GETCAPS */ +}; + + +/*** Config & Setup **********************************************************/ + + +static int __init dmasound_paula_init(void) +{ + int err; + + if (MACH_IS_AMIGA && AMIGAHW_PRESENT(AMI_AUDIO)) { + if (!request_mem_region(CUSTOM_PHYSADDR+0xa0, 0x40, + "dmasound [Paula]")) + return -EBUSY; + dmasound.mach = machAmiga; + dmasound.mach.default_hard = def_hard ; + dmasound.mach.default_soft = def_soft ; + err = dmasound_init(); + if (err) + release_mem_region(CUSTOM_PHYSADDR+0xa0, 0x40); + return err; + } else + return -ENODEV; +} + +static void __exit dmasound_paula_cleanup(void) +{ + dmasound_deinit(); + release_mem_region(CUSTOM_PHYSADDR+0xa0, 0x40); +} + +module_init(dmasound_paula_init); +module_exit(dmasound_paula_cleanup); +MODULE_LICENSE("GPL"); |
