/*===========================================================================*
* dsp_dma_setup
*===========================================================================*/
PRIVATE void dsp_dma_setup(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_S ? DMA8_AUTO_PLAY : DMA8_AUTO_REC));
pv_set(pvb[3], DMA8_ADDR, (address >> 0) & 0xff); /* Low_byte of address */
pv_set(pvb[4], DMA8_ADDR, (address >> 8) & 0xff); /* High byte of address */
pv_set(pvb[5], DMA8_PAGE, (address >> 16) & 0xff); /* 64K page number */
pv_set(pvb[6], DMA8_COUNT, (count >> 0) & 0xff); /* Low byte of count */
pv_set(pvb[7], DMA8_COUNT, (count >> 8) & 0xff); /* High byte of count */
pv_set(pvb[8], DMA8_MASK, SB_DMA_8); /* Enable DMA channel */
sys_voutb(pvb, 9);
} else { /* 16 bit sound */
/*===========================================================================*
* printer_intr *
*===========================================================================*/
static void printer_intr(unsigned int UNUSED(mask))
{
/* This function does the actual output to the printer. This is called on an
* interrupt message sent from the generic interrupt handler that 'forwards'
* interrupts to this driver. The generic handler did not reenable the printer
* IRQ yet!
*/
u32_t status;
pvb_pair_t char_out[3];
if (oleft == 0) {
/* Nothing more to print. Turn off printer interrupts in case they
* are level-sensitive as on the PS/2. This should be safe even
* when the printer is busy with a previous character, because the
* interrupt status does not affect the printer.
*/
if(sys_outb(port_base + 2, PR_SELECT) != OK) {
printf("printer: sys_outb of %x failed\n", port_base+2);
panic("sys_outb failed");
}
if(sys_irqenable(&irq_hook_id) != OK) {
panic("sys_irqenable failed");
}
return;
}
do {
/* Loop to handle fast (buffered) printers. It is important that
* processor interrupts are not disabled here, just printer interrupts.
*/
if(sys_inb(port_base + 1, &status) != OK) {
printf("printer: sys_inb of %x failed\n", port_base+1);
panic("sys_inb failed");
}
if ((status & STATUS_MASK) == BUSY_STATUS) {
/* Still busy with last output. This normally happens
* immediately after doing output to an unbuffered or slow
* printer. It may happen after a call from prepare_output or
* pr_restart, since they are not synchronized with printer
* interrupts. It may happen after a spurious interrupt.
*/
if(sys_irqenable(&irq_hook_id) != OK) {
panic("sys_irqenable failed");
}
return;
}
if ((status & STATUS_MASK) == NORMAL_STATUS) {
/* Everything is all right. Output another character. */
pv_set(char_out[0], port_base, *optr);
optr++;
pv_set(char_out[1], port_base+2, ASSERT_STROBE);
pv_set(char_out[2], port_base+2, NEGATE_STROBE);
if(sys_voutb(char_out, 3) != OK) {
/* request series of port outb */
panic("sys_voutb failed");
}
user_vir_d++;
user_left--;
} else {
/* Error. This would be better ignored (treat as busy). */
done_status = status;
output_done();
if(sys_irqenable(&irq_hook_id) != OK) {
panic("sys_irqenable failed");
}
return;
}
}
while (--oleft != 0);
/* Finished printing chunk OK. */
done_status = OK;
output_done();
if(sys_irqenable(&irq_hook_id) != OK) {
panic("sys_irqenable failed");
}
}