minix/drivers/sb16/sb16_dsp.c
2005-09-16 11:09:08 +00:00

653 lines
19 KiB
C

/* This file contains the driver for a DSP (Digital Sound Processor) on
* a SoundBlaster 16 soundcard.
*
* The driver supports the following operations (using message format m2):
*
* m_type DEVICE PROC_NR COUNT POSITION ADRRESS
* ----------------------------------------------------------------
* | DEV_OPEN | device | proc nr | | | |
* |------------+---------+---------+---------+---------+---------|
* | DEV_CLOSE | device | proc nr | | | |
* |------------+---------+---------+---------+---------+---------|
* | DEV_READ | device | proc nr | bytes | | buf ptr |
* |------------+---------+---------+---------+---------+---------|
* | DEV_WRITE | device | proc nr | bytes | | buf ptr |
* |------------+---------+---------+---------+---------+---------|
* | DEV_IOCTL | device | proc nr |func code| | buf ptr |
* ----------------------------------------------------------------
*
* The file contains one entry point:
*
* main: main entry when driver is brought up
*
* August 24 2005 Ported driver to user space (only audio playback) (Peter Boonstoppel)
* May 20 1995 Author: Michel R. Prevenier
*/
#include "sb16.h"
_PROTOTYPE(void main, (void));
FORWARD _PROTOTYPE( int dsp_open, (void) );
FORWARD _PROTOTYPE( int dsp_close, (void) );
FORWARD _PROTOTYPE( int dsp_ioctl, (message *m_ptr) );
FORWARD _PROTOTYPE( void dsp_write, (message *m_ptr) );
FORWARD _PROTOTYPE( void dsp_hardware_msg, (void) );
FORWARD _PROTOTYPE( void dsp_status, (message *m_ptr) );
FORWARD _PROTOTYPE( void reply, (int code, int replyee, int process, int status) );
FORWARD _PROTOTYPE( void init_buffer, (void) );
FORWARD _PROTOTYPE( int dsp_init, (void) );
FORWARD _PROTOTYPE( int dsp_reset, (void) );
FORWARD _PROTOTYPE( int dsp_command, (int value) );
FORWARD _PROTOTYPE( int dsp_set_size, (unsigned int size) );
FORWARD _PROTOTYPE( int dsp_set_speed, (unsigned int speed) );
FORWARD _PROTOTYPE( int dsp_set_stereo, (unsigned int stereo) );
FORWARD _PROTOTYPE( int dsp_set_bits, (unsigned int bits) );
FORWARD _PROTOTYPE( int dsp_set_sign, (unsigned int sign) );
FORWARD _PROTOTYPE( void dsp_dma_setup, (phys_bytes address, int count) );
FORWARD _PROTOTYPE( void dsp_setup, (void) );
PRIVATE int irq_hook_id; /* id of irq hook at the kernel */
PRIVATE char DmaBuffer[DMA_SIZE + 64 * 1024];
PRIVATE char* DmaPtr;
PRIVATE phys_bytes DmaPhys;
PRIVATE char Buffer[DSP_MAX_FRAGMENT_SIZE * DSP_NR_OF_BUFFERS];
PRIVATE int DspVersion[2];
PRIVATE unsigned int DspStereo = DEFAULT_STEREO;
PRIVATE unsigned int DspSpeed = DEFAULT_SPEED;
PRIVATE unsigned int DspBits = DEFAULT_BITS;
PRIVATE unsigned int DspSign = DEFAULT_SIGN;
PRIVATE unsigned int DspFragmentSize = DSP_MAX_FRAGMENT_SIZE;
PRIVATE int DspAvail = 0;
PRIVATE int DspBusy = 0;
PRIVATE int DmaMode = 0;
PRIVATE int DmaBusy = -1;
PRIVATE int DmaFillNext = 0;
PRIVATE int BufReadNext = -1;
PRIVATE int BufFillNext = 0;
PRIVATE int revivePending = 0;
PRIVATE int reviveStatus;
PRIVATE int reviveProcNr;
#define dprint (void)
/*===========================================================================*
* main
*===========================================================================*/
PUBLIC void main()
{
int r, caller, proc_nr, s;
message mess;
dprint("sb16_dsp.c: main()\n");
/* Get a DMA buffer. */
init_buffer();
while(TRUE) {
/* Wait for an incoming message */
receive(ANY, &mess);
caller = mess.m_source;
proc_nr = mess.PROC_NR;
/* Now carry out the work. */
switch(mess.m_type) {
case DEV_OPEN: r = dsp_open(); break;
case DEV_CLOSE: r = dsp_close(); break;
case DEV_IOCTL: r = dsp_ioctl(&mess); break;
case DEV_READ: r = EINVAL; break; /* Not yet implemented */
case DEV_WRITE: dsp_write(&mess); continue; /* don't reply */
case DEV_STATUS: dsp_status(&mess); continue; /* don't reply */
case HARD_INT: dsp_hardware_msg(); continue; /* don't reply */
case SYS_SIG: continue; /* don't reply */
default: r = EINVAL;
}
/* Finally, prepare and send the reply message. */
reply(TASK_REPLY, caller, proc_nr, r);
}
}
/*===========================================================================*
* dsp_open
*===========================================================================*/
PRIVATE int dsp_open()
{
dprint("sb16_dsp.c: dsp_open()\n");
/* try to detect SoundBlaster card */
if(!DspAvail && dsp_init() != OK) return EIO;
/* Only one open at a time with soundcards */
if(DspBusy) return EBUSY;
/* Start with a clean DSP */
if(dsp_reset() != OK) return EIO;
/* Setup default values */
DspStereo = DEFAULT_STEREO;
DspSpeed = DEFAULT_SPEED;
DspBits = DEFAULT_BITS;
DspSign = DEFAULT_SIGN;
DspFragmentSize = DMA_SIZE / 2;
DspBusy = 1;
return OK;
}
/*===========================================================================*
* dsp_close
*===========================================================================*/
PRIVATE int dsp_close()
{
dprint("sb16_dsp.c: dsp_close()\n");
DspBusy = 0; /* soundcard available again */
return OK;
}
/*===========================================================================*
* dsp_ioctl
*===========================================================================*/
PRIVATE int dsp_ioctl(m_ptr)
message *m_ptr;
{
int status;
phys_bytes user_phys;
unsigned int val;
dprint("sb16_dsp.c: dsp_ioctl()\n");
/* Cannot change parameters during play or recording */
if(DmaBusy >= 0) return EBUSY;
/* Get user data */
if(m_ptr->REQUEST != DSPIORESET) {
sys_vircopy(m_ptr->PROC_NR, D, (vir_bytes)m_ptr->ADDRESS, SELF, D, (vir_bytes)&val, sizeof(val));
}
dprint("dsp_ioctl: got ioctl %d, argument: %d\n", m_ptr->REQUEST, val);
switch(m_ptr->REQUEST) {
case DSPIORATE: status = dsp_set_speed(val); break;
case DSPIOSTEREO: status = dsp_set_stereo(val); break;
case DSPIOBITS: status = dsp_set_bits(val); break;
case DSPIOSIZE: status = dsp_set_size(val); break;
case DSPIOSIGN: status = dsp_set_sign(val); break;
case DSPIOMAX:
val = DSP_MAX_FRAGMENT_SIZE;
sys_vircopy(SELF, D, (vir_bytes)&val, m_ptr->PROC_NR, D, (vir_bytes)m_ptr->ADDRESS, sizeof(val));
status = OK;
break;
case DSPIORESET: status = dsp_reset(); break;
default: status = ENOTTY; break;
}
return status;
}
/*===========================================================================*
* dsp_write
*===========================================================================*/
PRIVATE void dsp_write(m_ptr)
message *m_ptr;
{
int s;
message mess;
dprint("sb16_dsp.c: dsp_write()\n");
if(m_ptr->COUNT != DspFragmentSize) {
reply(TASK_REPLY, m_ptr->m_source, m_ptr->PROC_NR, EINVAL);
return;
}
if(m_ptr->m_type != DmaMode && DmaBusy >= 0) {
reply(TASK_REPLY, m_ptr->m_source, m_ptr->PROC_NR, EBUSY);
return;
}
reply(TASK_REPLY, m_ptr->m_source, m_ptr->PROC_NR, SUSPEND);
if(DmaBusy < 0) { /* Dma tranfer not yet started */
DmaMode = DEV_WRITE; /* Dma mode is writing */
sys_datacopy(m_ptr->PROC_NR, (vir_bytes)m_ptr->ADDRESS, SELF, (vir_bytes)DmaPtr, (phys_bytes)DspFragmentSize);
dsp_dma_setup(DmaPhys, DspFragmentSize * DMA_NR_OF_BUFFERS);
dsp_setup();
DmaBusy = 0; /* Dma is busy */
dprint(" filled dma[0]\n");
DmaFillNext = 1;
} else if(DmaBusy != DmaFillNext) { /* Dma transfer started, but Dma buffer not yet full */
sys_datacopy(m_ptr->PROC_NR, (vir_bytes)m_ptr->ADDRESS, SELF, (vir_bytes)DmaPtr + DmaFillNext * DspFragmentSize, (phys_bytes)DspFragmentSize);
dprint(" filled dma[%d]\n", DmaFillNext);
DmaFillNext = (DmaFillNext + 1) % DMA_NR_OF_BUFFERS;
} else if(BufReadNext < 0) { /* Dma buffer full, fill first element of second buffer */
sys_datacopy(m_ptr->PROC_NR, (vir_bytes)m_ptr->ADDRESS, SELF, (vir_bytes)Buffer, (phys_bytes)DspFragmentSize);
dprint(" filled buf[0]\n");
BufReadNext = 0;
BufFillNext = 1;
} else { /* Dma buffer is full, filling second buffer */
while(BufReadNext == BufFillNext) { /* Second buffer also full, wait for space to become available */
receive(HARDWARE, &mess);
dsp_hardware_msg();
}
sys_datacopy(m_ptr->PROC_NR, (vir_bytes)m_ptr->ADDRESS, SELF, (vir_bytes)Buffer + BufFillNext * DspFragmentSize, (phys_bytes)DspFragmentSize);
dprint(" filled buf[%d]\n", BufFillNext);
BufFillNext = (BufFillNext + 1) % DSP_NR_OF_BUFFERS;
}
revivePending = 1;
reviveStatus = DspFragmentSize;
reviveProcNr = m_ptr->PROC_NR;
notify(m_ptr->m_source);
}
/*===========================================================================*
* dsp_hardware_msg
*===========================================================================*/
PRIVATE void dsp_hardware_msg()
{
dprint("Interrupt: ");
if(DmaBusy >= 0) { /* Dma transfer was actually busy */
dprint("Finished playing dma[%d]; ", DmaBusy);
DmaBusy = (DmaBusy + 1) % DMA_NR_OF_BUFFERS;
if(DmaBusy == DmaFillNext) { /* Dma buffer empty, stop Dma transfer */
dsp_command((DspBits == 8 ? DSP_CMD_DMA8HALT : DSP_CMD_DMA16HALT));
dprint("No more work...!\n");
DmaBusy = -1;
} else if(BufReadNext >= 0) { /* Data in second buffer, copy one fragment to Dma buffer */
/* Acknowledge the interrupt on the DSP */
sb16_inb((DspBits == 8 ? DSP_DATA_AVL : DSP_DATA16_AVL));
memcpy(DmaPtr + DmaFillNext * DspFragmentSize, Buffer + BufReadNext * DspFragmentSize, DspFragmentSize);
dprint("copy buf[%d] -> dma[%d]; ", BufReadNext, DmaFillNext);
BufReadNext = (BufReadNext + 1) % DSP_NR_OF_BUFFERS;
DmaFillNext = (DmaFillNext + 1) % DMA_NR_OF_BUFFERS;
if(BufReadNext == BufFillNext) {
BufReadNext = -1;
}
dprint("Starting dma[%d]\n", DmaBusy);
return;
} else { /* Second buffer empty, still data in Dma buffer, continue playback */
dprint("Starting dma[%d]\n", DmaBusy);
}
}
/* Acknowledge the interrupt on the DSP */
sb16_inb((DspBits == 8 ? DSP_DATA_AVL : DSP_DATA16_AVL));
}
/*===========================================================================*
* dsp_status *
*===========================================================================*/
PRIVATE void dsp_status(m_ptr)
message *m_ptr; /* pointer to the newly arrived message */
{
if(revivePending) {
m_ptr->m_type = DEV_REVIVE; /* build message */
m_ptr->REP_PROC_NR = reviveProcNr;
m_ptr->REP_STATUS = reviveStatus;
revivePending = 0; /* unmark event */
} else {
m_ptr->m_type = DEV_NO_STATUS;
}
send(m_ptr->m_source, m_ptr); /* send the message */
}
/*===========================================================================*
* reply *
*===========================================================================*/
PRIVATE void reply(code, replyee, process, status)
int code;
int replyee;
int process;
int status;
{
message m;
m.m_type = code; /* TASK_REPLY or REVIVE */
m.REP_STATUS = status; /* result of device operation */
m.REP_PROC_NR = process; /* which user made the request */
send(replyee, &m);
}
/*===========================================================================*
* init_buffer
*===========================================================================*/
PRIVATE void init_buffer()
{
/* Select a buffer that can safely be used for dma transfers.
* Its absolute address is 'DmaPhys', the normal address is 'DmaPtr'.
*/
#if (CHIP == INTEL)
unsigned left;
DmaPtr = DmaBuffer;
sys_umap(SELF, D, (vir_bytes)DmaBuffer, (phys_bytes)sizeof(DmaBuffer), &DmaPhys);
if((left = dma_bytes_left(DmaPhys)) < DMA_SIZE) {
/* First half of buffer crosses a 64K boundary, can't DMA into that */
DmaPtr += left;
DmaPhys += left;
}
#else /* CHIP != INTEL */
panic("SB16DSP","init_buffer() failed, CHIP != INTEL", 0);
#endif /* CHIP == INTEL */
}
/*===========================================================================*
* dsp_init
*===========================================================================*/
PRIVATE int dsp_init()
{
int i, s;
if(dsp_reset () != OK) {
dprint("sb16: No SoundBlaster card detected\n");
return -1;
}
DspVersion[0] = DspVersion[1] = 0;
dsp_command(DSP_GET_VERSION); /* Get DSP version bytes */
for(i = 1000; i; i--) {
if(sb16_inb(DSP_DATA_AVL) & 0x80) {
if(DspVersion[0] == 0) {
DspVersion[0] = sb16_inb(DSP_READ);
} else {
DspVersion[1] = sb16_inb(DSP_READ);
break;
}
}
}
if(DspVersion[0] < 4) {
dprint("sb16: No SoundBlaster 16 compatible card detected\n");
return -1;
}
dprint("sb16: SoundBlaster DSP version %d.%d detected\n", DspVersion[0], DspVersion[1]);
/* set SB to use our IRQ and DMA channels */
mixer_set(MIXER_SET_IRQ, (1 << (SB_IRQ / 2 - 1)));
mixer_set(MIXER_SET_DMA, (1 << SB_DMA_8 | 1 << SB_DMA_16));
/* register interrupt vector and enable irq */
if ((s=sys_irqsetpolicy(SB_IRQ, IRQ_REENABLE, &irq_hook_id )) != OK)
panic("SB16DSP", "Couldn't set IRQ policy", s);
if ((s=sys_irqenable(&irq_hook_id)) != OK)
panic("SB16DSP", "Couldn't enable IRQ", s);
DspAvail = 1;
return OK;
}
/*===========================================================================*
* dsp_reset
*===========================================================================*/
PRIVATE int dsp_reset()
{
int i;
sb16_outb(DSP_RESET, 1);
for(i = 0; i < 1000; i++); /* wait a while */
sb16_outb(DSP_RESET, 0);
for(i = 0; i < 1000 && !(sb16_inb(DSP_DATA_AVL) & 0x80); i++);
if(sb16_inb(DSP_READ) != 0xAA) return EIO; /* No SoundBlaster */
DmaBusy = -1;
return OK;
}
/*===========================================================================*
* dsp_command
*===========================================================================*/
PRIVATE int dsp_command(value)
int value;
{
int i, status;
for (i = 0; i < SB_TIMEOUT; i++) {
if((sb16_inb(DSP_STATUS) & 0x80) == 0) {
sb16_outb(DSP_COMMAND, value);
return OK;
}
}
dprint("sb16: SoundBlaster: DSP Command(%x) timeout\n", value);
return -1;
}
/*===========================================================================*
* dsp_set_size
*===========================================================================*/
static int dsp_set_size(size)
unsigned int size;
{
dprint("dsp_set_size(): set fragment size to %u\n", size);
/* Sanity checks */
if(size < DSP_MIN_FRAGMENT_SIZE || size > DSP_MAX_FRAGMENT_SIZE || size % 2 != 0) {
return EINVAL;
}
DspFragmentSize = size;
return OK;
}
/*===========================================================================*
* dsp_set_speed
*===========================================================================*/
static int dsp_set_speed(speed)
unsigned int speed;
{
dprint("sb16: setting speed to %u, stereo = %d\n", speed, DspStereo);
if(speed < DSP_MIN_SPEED || speed > DSP_MAX_SPEED) {
return EPERM;
}
/* Soundblaster 16 can be programmed with real sample rates
* instead of time constants
*
* Since you cannot sample and play at the same time
* we set in- and output rate to the same value
*/
dsp_command(DSP_INPUT_RATE); /* set input rate */
dsp_command(speed >> 8); /* high byte of speed */
dsp_command(speed); /* low byte of speed */
dsp_command(DSP_OUTPUT_RATE); /* same for output rate */
dsp_command(speed >> 8);
dsp_command(speed);
DspSpeed = speed;
return OK;
}
/*===========================================================================*
* dsp_set_stereo
*===========================================================================*/
static int dsp_set_stereo(stereo)
unsigned int stereo;
{
if(stereo) {
DspStereo = 1;
} else {
DspStereo = 0;
}
return OK;
}
/*===========================================================================*
* dsp_set_bits
*===========================================================================*/
static int dsp_set_bits(bits)
unsigned int bits;
{
/* Sanity checks */
if(bits != 8 && bits != 16) {
return EINVAL;
}
DspBits = bits;
return OK;
}
/*===========================================================================*
* dsp_set_sign
*===========================================================================*/
static int dsp_set_sign(sign)
unsigned int sign;
{
dprint("sb16: set sign to %u\n", sign);
DspSign = (sign > 0 ? 1 : 0);
return OK;
}
/*===========================================================================*
* dsp_dma_setup
*===========================================================================*/
PRIVATE void dsp_dma_setup(address, count)
phys_bytes address;
int count;
{
pvb_pair_t pvb[9];
dprint("Setting up %d bit DMA\n", DspBits);
if(DspBits == 8) { /* 8 bit sound */
count--;
pv_set(pvb[0], DMA8_MASK, SB_DMA_8 | 0x04); /* Disable DMA channel */
pv_set(pvb[1], DMA8_CLEAR, 0x00); /* Clear flip flop */
/* set DMA mode */
pv_set(pvb[2], DMA8_MODE, (DmaMode == DEV_WRITE ? DMA8_AUTO_PLAY : DMA8_AUTO_REC));
pv_set(pvb[3], DMA8_ADDR, address >> 0); /* Low_byte of address */
pv_set(pvb[4], DMA8_ADDR, address >> 8); /* High byte of address */
pv_set(pvb[5], DMA8_PAGE, address >> 16); /* 64K page number */
pv_set(pvb[6], DMA8_COUNT, count >> 0); /* Low byte of count */
pv_set(pvb[7], DMA8_COUNT, count >> 8); /* High byte of count */
pv_set(pvb[8], DMA8_MASK, SB_DMA_8); /* Enable DMA channel */
sys_voutb(pvb, 9);
} else { /* 16 bit sound */
count-= 2;
pv_set(pvb[0], DMA16_MASK, (SB_DMA_16 & 3) | 0x04); /* Disable DMA channel */
pv_set(pvb[1], DMA16_CLEAR, 0x00); /* Clear flip flop */
/* Set dma mode */
pv_set(pvb[2], DMA16_MODE, (DmaMode == DEV_WRITE ? DMA16_AUTO_PLAY : DMA16_AUTO_REC));
pv_set(pvb[3], DMA16_ADDR, (address >> 1) & 0xFF); /* Low_byte of address */
pv_set(pvb[4], DMA16_ADDR, (address >> 9) & 0xFF); /* High byte of address */
pv_set(pvb[5], DMA16_PAGE, (address >> 16) & 0xFE); /* 128K page number */
pv_set(pvb[6], DMA16_COUNT, count >> 1); /* Low byte of count */
pv_set(pvb[7], DMA16_COUNT, count >> 9); /* High byte of count */
pv_set(pvb[8], DMA16_MASK, SB_DMA_16 & 3); /* Enable DMA channel */
sys_voutb(pvb, 9);
}
}
/*===========================================================================*
* dsp_setup()
*===========================================================================*/
PRIVATE void dsp_setup()
{
/* Set current sample speed */
dsp_set_speed(DspSpeed);
/* Put the speaker on */
if(DmaMode == DEV_WRITE) {
dsp_command (DSP_CMD_SPKON); /* put speaker on */
/* Program DSP with dma mode */
dsp_command((DspBits == 8 ? DSP_CMD_8BITAUTO_OUT : DSP_CMD_16BITAUTO_OUT));
} else {
dsp_command (DSP_CMD_SPKOFF); /* put speaker off */
/* Program DSP with dma mode */
dsp_command((DspBits == 8 ? DSP_CMD_8BITAUTO_IN : DSP_CMD_16BITAUTO_IN));
}
/* Program DSP with transfer mode */
if (!DspSign) {
dsp_command((DspStereo == 1 ? DSP_MODE_STEREO_US : DSP_MODE_MONO_US));
} else {
dsp_command((DspStereo == 1 ? DSP_MODE_STEREO_S : DSP_MODE_MONO_S));
}
/* Give length of fragment to DSP */
if (DspBits == 8) { /* 8 bit transfer */
/* #bytes - 1 */
dsp_command((DspFragmentSize - 1) >> 0);
dsp_command((DspFragmentSize - 1) >> 8);
} else { /* 16 bit transfer */
/* #words - 1 */
dsp_command((DspFragmentSize - 1) >> 1);
dsp_command((DspFragmentSize - 1) >> 9);
}
}