--- /dev/null
+/* MikMod sound library
+ (c) 1998, 1999 Miodrag Vallat and others - see file AUTHORS for
+ complete list.
+
+ This library is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of
+ the License, or (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ 02111-1307, USA.
+*/
+
+/*==============================================================================
+
+ Sound Blaster I/O routines, common for SB8, SBPro and SB16
+ Written by Andrew Zabolotny <bit@eltech.ru>
+
+==============================================================================*/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#ifdef DRV_SB
+
+#include <stdlib.h>
+#include <dpmi.h>
+#include <go32.h>
+#include <dos.h>
+#include <sys/nearptr.h>
+#include <sys/farptr.h>
+#include <string.h>
+
+#include "dossb.h"
+
+/********************************************* Private variables/routines *****/
+
+__sb_state sb;
+
+/* Wait for SoundBlaster for some time */
+#if !defined(__GNUC__) || (__GNUC__ < 3) || (__GNUC__ == 3 && __GNUC_MINOR__ == 0)
+# define _func_noinline volatile /* match original code */
+# define _func_noclone
+#else
+/* avoid warnings from newer gcc:
+ * "function definition has qualified void return type" and
+ * function return types not compatible due to 'volatile' */
+# define _func_noinline __attribute__((__noinline__))
+# if (__GNUC__ < 4) || (__GNUC__ == 4 && __GNUC_MINOR__ < 5)
+# define _func_noclone
+# else
+# define _func_noclone __attribute__((__noclone__))
+# endif
+#endif
+_func_noinline
+_func_noclone
+ void __sb_wait()
+{
+ inportb(SB_DSP_RESET);
+ inportb(SB_DSP_RESET);
+ inportb(SB_DSP_RESET);
+ inportb(SB_DSP_RESET);
+ inportb(SB_DSP_RESET);
+ inportb(SB_DSP_RESET);
+}
+
+static void sb_irq()
+{
+ /* Make sure its not a spurious IRQ */
+ if (!irq_check(sb.irq_handle))
+ return;
+
+ sb.irqcount++;
+
+ /* Acknowledge DMA transfer is complete */
+ if (sb.mode & SBMODE_16BITS)
+ __sb_dsp_ack_dma16();
+ else
+ __sb_dsp_ack_dma8();
+
+ /* SoundBlaster 1.x cannot do autoinit ... */
+ if (sb.dspver < SBVER_20)
+ __sb_dspreg_outwlh(SBDSP_DMA_PCM8, (sb.dma_buff->size >> 1) - 1);
+
+ /* Send EOI */
+ irq_ack(sb.irq_handle);
+
+ enable();
+ if (sb.timer_callback)
+ sb.timer_callback();
+}
+
+static void sb_irq_end()
+{
+}
+
+static boolean __sb_reset()
+{
+ /* Disable the output */
+ sb_output(FALSE);
+
+ /* Clear pending ints if any */
+ __sb_dsp_ack_dma8();
+ __sb_dsp_ack_dma16();
+
+ /* Reset the DSP */
+ outportb(SB_DSP_RESET, SBM_DSP_RESET);
+ __sb_wait();
+ __sb_wait();
+ outportb(SB_DSP_RESET, 0);
+
+ /* Now wait for AA coming from datain port */
+ if (__sb_dsp_in() != 0xaa)
+ return FALSE;
+
+ /* Finally, get the DSP version */
+ if ((sb.dspver = __sb_dsp_version()) == 0xffff)
+ return FALSE;
+ /* Check again */
+ if (sb.dspver != __sb_dsp_version())
+ return FALSE;
+
+ return TRUE;
+}
+
+/***************************************************** SB detection stuff *****/
+
+static int __sb_irq_irqdetect(int irqno)
+{
+ __sb_dsp_ack_dma8();
+ return 1;
+}
+
+static void __sb_irq_dmadetect()
+{
+ /* Make sure its not a spurious IRQ */
+ if (!irq_check(sb.irq_handle))
+ return;
+
+ sb.irqcount++;
+
+ /* Acknowledge DMA transfer is complete */
+ if (sb.mode & SBMODE_16BITS)
+ __sb_dsp_ack_dma16();
+ else
+ __sb_dsp_ack_dma8();
+
+ /* Send EOI */
+ irq_ack(sb.irq_handle);
+}
+
+static boolean __sb_detect()
+{
+ /* First find the port number */
+ if (!sb.port) {
+ int i;
+ for (i = 5; i >= 0; i--) {
+ sb.port = 0x210 + i * 0x10;
+ if (__sb_reset())
+ break;
+ }
+ if (i < 0) {
+ sb.port = 0;
+ return FALSE;
+ }
+ }
+
+ /* Now detect the IRQ and DMA numbers */
+ if (!sb.irq) {
+ unsigned int irqmask, sbirqmask, sbirqcount;
+ unsigned long timer;
+
+ /* IRQ can be one of 2,3,5,7,10 */
+ irq_detect_start(0x04ac, __sb_irq_irqdetect);
+
+ /* Prepare timeout counter */
+ _farsetsel(_dos_ds);
+ timer = _farnspeekl(0x46c);
+
+ sbirqmask = 0;
+ sbirqcount = 10; /* Emit 10 SB irqs */
+
+ /* Tell SoundBlaster to emit IRQ for 8-bit transfers */
+ __sb_dsp_out(SBDSP_GEN_IRQ8);
+ __sb_wait();
+ for (;;) {
+ irq_detect_get(0, &irqmask);
+ if (irqmask) {
+ sbirqmask |= irqmask;
+ if (!--sbirqcount)
+ break;
+ __sb_dsp_out(SBDSP_GEN_IRQ8);
+ }
+ if (_farnspeekl(0x46c) - timer >= 9) /* Wait ~1/2 secs */
+ break;
+ }
+ if (sbirqmask)
+ for (sb.irq = 15; sb.irq > 0; sb.irq--)
+ if (irq_detect_get(sb.irq, &irqmask) == 10)
+ break;
+
+ irq_detect_end();
+ if (!sb.irq)
+ return FALSE;
+ }
+
+ /* Detect the 8-bit and 16-bit DMAs */
+ if (!sb.dma8 || ((sb.dspver >= SBVER_16) && !sb.dma16)) {
+ static int __dma8[] = { 0, 1, 3 };
+ static int __dma16[] = { 5, 6, 7 };
+ int *dma;
+
+ sb_output(FALSE);
+ /* Temporary hook SB IRQ */
+ sb.irq_handle = irq_hook(sb.irq, __sb_irq_dmadetect, 200);
+ irq_enable(sb.irq_handle);
+ if (sb.irq > 7)
+ _irq_enable(2);
+
+ /* Start a short DMA transfer and check if IRQ happened */
+ for (;;) {
+ int i;
+ unsigned int timer, oldcount;
+
+ if (!sb.dma8)
+ dma = &sb.dma8;
+ else if ((sb.dspver >= SBVER_16) && !sb.dma16)
+ dma = &sb.dma16;
+ else
+ break;
+
+ for (i = 0; i < 3; i++) {
+ boolean success = 1;
+
+ *dma = (dma == &sb.dma8) ? __dma8[i] : __dma16[i];
+ oldcount = sb.irqcount;
+
+ dma_disable(*dma);
+ dma_set_mode(*dma, DMA_MODE_WRITE);
+ dma_clear_ff(*dma);
+ dma_set_count(*dma, 2);
+ dma_enable(*dma);
+
+ __sb_dspreg_out(SBDSP_SET_TIMING, 206); /* 20KHz */
+ if (dma == &sb.dma8) {
+ sb.mode = 0;
+ __sb_dspreg_outwlh(SBDSP_DMA_PCM8, 1);
+ } else {
+ sb.mode = SBMODE_16BITS;
+ __sb_dspreg_out(SBDSP_DMA_GENERIC16, 0);
+ __sb_dsp_out(0);
+ __sb_dsp_out(1);
+ }
+
+ _farsetsel(_dos_ds);
+ timer = _farnspeekl(0x46c);
+
+ while (oldcount == sb.irqcount)
+ if (_farnspeekl(0x46c) - timer >= 2) {
+ success = 0;
+ break;
+ }
+ dma_disable(*dma);
+ if (success)
+ break;
+ *dma = 0;
+ }
+ if (!*dma)
+ break;
+ }
+
+ irq_unhook(sb.irq_handle);
+ sb.irq_handle = NULL;
+ if (!sb.dma8 || ((sb.dspver >= SBVER_16) && !sb.dma16))
+ return FALSE;
+ }
+ return TRUE;
+}
+
+/*************************************************** High-level interface *****/
+
+/* Detect whenever SoundBlaster is present and fill "sb" structure */
+boolean sb_detect()
+{
+ char *env;
+
+ /* Try to find the port and DMA from environment */
+ env = getenv("BLASTER");
+
+ while (env && *env) {
+ /* Skip whitespace */
+ while ((*env == ' ') || (*env == '\t'))
+ env++;
+ if (!*env)
+ break;
+
+ switch (*env++) {
+ case 'A':
+ case 'a':
+ if (!sb.port)
+ sb.port = strtol(env, &env, 16);
+ break;
+ case 'E':
+ case 'e':
+ if (!sb.aweport)
+ sb.aweport = strtol(env, &env, 16);
+ break;
+ case 'I':
+ case 'i':
+ if (!sb.irq)
+ sb.irq = strtol(env, &env, 10);
+ break;
+ case 'D':
+ case 'd':
+ if (!sb.dma8)
+ sb.dma8 = strtol(env, &env, 10);
+ break;
+ case 'H':
+ case 'h':
+ if (!sb.dma16)
+ sb.dma16 = strtol(env, &env, 10);
+ break;
+ default:
+ /* Skip other values (H == MIDI, T == model, any other?) */
+ while (*env && (*env != ' ') && (*env != '\t'))
+ env++;
+ break;
+ }
+ }
+
+ /* Try to detect missing sound card parameters */
+ __sb_detect();
+
+ if (!sb.port || !sb.irq || !sb.dma8)
+ return FALSE;
+
+ if (!__sb_reset())
+ return FALSE;
+
+ if ((sb.dspver >= SBVER_16) && !sb.dma16)
+ return FALSE;
+
+ if (sb.dspver >= SBVER_PRO)
+ sb.caps |= SBMODE_STEREO;
+ if (sb.dspver >= SBVER_16 && sb.dma16)
+ sb.caps |= SBMODE_16BITS;
+ if (sb.dspver < SBVER_20)
+ sb.maxfreq_mono = 22222;
+ else
+ sb.maxfreq_mono = 45454;
+ if (sb.dspver <= SBVER_16)
+ sb.maxfreq_stereo = 22727;
+ else
+ sb.maxfreq_stereo = 45454;
+
+ sb.ok = 1;
+ return TRUE;
+}
+
+/* Reset SoundBlaster */
+void sb_reset()
+{
+ sb_stop_dma();
+ __sb_reset();
+}
+
+/* Start working with SoundBlaster */
+boolean sb_open()
+{
+ __dpmi_meminfo struct_info;
+
+ if (!sb.ok)
+ if (!sb_detect())
+ return FALSE;
+
+ if (sb.open)
+ return FALSE;
+
+ /* Now lock the sb structure in memory */
+ struct_info.address = __djgpp_base_address + (unsigned long)&sb;
+ struct_info.size = sizeof(sb);
+ if (__dpmi_lock_linear_region(&struct_info))
+ return FALSE;
+
+ /* Hook the SB IRQ */
+ sb.irq_handle = irq_hook(sb.irq, sb_irq, (long)sb_irq_end - (long)sb_irq);
+ if (!sb.irq_handle) {
+ __dpmi_unlock_linear_region(&struct_info);
+ return FALSE;
+ }
+
+ /* Enable the interrupt */
+ irq_enable(sb.irq_handle);
+ if (sb.irq > 7)
+ _irq_enable(2);
+
+ sb.open++;
+
+ return TRUE;
+}
+
+/* Finish working with SoundBlaster */
+boolean sb_close()
+{
+ __dpmi_meminfo struct_info;
+ if (!sb.open)
+ return FALSE;
+
+ sb.open--;
+
+ /* Stop/free DMA buffer */
+ sb_stop_dma();
+
+ /* Unhook IRQ */
+ irq_unhook(sb.irq_handle);
+ sb.irq_handle = NULL;
+
+ /* Unlock the sb structure */
+ struct_info.address = __djgpp_base_address + (unsigned long)&sb;
+ struct_info.size = sizeof(sb);
+ __dpmi_unlock_linear_region(&struct_info);
+
+ return TRUE;
+}
+
+/* Enable/disable stereo DSP mode */
+/* Enable/disable speaker output */
+void sb_output(boolean enable)
+{
+ __sb_dsp_out(enable ? SBDSP_SPEAKER_ENA : SBDSP_SPEAKER_DIS);
+}
+
+/* Start playing from DMA buffer */
+boolean sb_start_dma(unsigned char mode, unsigned int freq)
+{
+ int dmachannel = (mode & SBMODE_16BITS) ? sb.dma16 : sb.dma8;
+ int dmabuffsize;
+ unsigned int tc = 0; /* timing constant (<=sbpro only) */
+
+ /* Stop DMA transfer if it is enabled */
+ sb_stop_dma();
+
+ /* Sanity check */
+ if ((mode & SBMODE_MASK & sb.caps) != (mode & SBMODE_MASK))
+ return FALSE;
+
+ /* Check this SB can perform at requested frequency */
+ if (((mode & SBMODE_STEREO) && (freq > sb.maxfreq_stereo))
+ || (!(mode & SBMODE_STEREO) && (freq > sb.maxfreq_mono)))
+ return FALSE;
+
+ /* Check the timing constant here to avoid failing later */
+ if (sb.dspver < SBVER_16) {
+ /* SBpro cannot do signed transfer */
+ if (mode & SBMODE_SIGNED)
+ return FALSE;
+
+ /* Old SBs have a different way on setting DMA timing constant */
+ tc = freq;
+ if (mode & SBMODE_STEREO)
+ tc *= 2;
+ tc = 1000000 / tc;
+ if (tc > 255)
+ return FALSE;
+ }
+
+ sb.mode = mode;
+
+ /* Get a DMA buffer enough for a 1/4sec interval... 4K <= dmasize <= 32K */
+ dmabuffsize = freq;
+ if (mode & SBMODE_STEREO)
+ dmabuffsize *= 2;
+ if (mode & SBMODE_16BITS)
+ dmabuffsize *= 2;
+ dmabuffsize >>= 2;
+ if (dmabuffsize < 4096)
+ dmabuffsize = 4096;
+ if (dmabuffsize > 32768)
+ dmabuffsize = 32768;
+ dmabuffsize = (dmabuffsize + 255) & 0xffffff00;
+
+ sb.dma_buff = dma_allocate(dmachannel, dmabuffsize);
+ if (!sb.dma_buff)
+ return FALSE;
+
+ /* Fill DMA buffer with silence */
+ dmabuffsize = sb.dma_buff->size;
+ if (mode & SBMODE_SIGNED)
+ memset(sb.dma_buff->linear, 0, dmabuffsize);
+ else
+ memset(sb.dma_buff->linear, 0x80, dmabuffsize);
+
+ /* Prime DMA for transfer */
+ dma_start(sb.dma_buff, dmabuffsize, DMA_MODE_WRITE | DMA_MODE_AUTOINIT);
+
+ /* Tell SoundBlaster to start transfer */
+ if (sb.dspver >= SBVER_16) { /* SB16 */
+ __sb_dspreg_outwhl(SBDSP_SET_RATE, freq);
+
+ /* Start DMA->DAC transfer */
+ __sb_dspreg_out(SBM_GENDAC_AUTOINIT | SBM_GENDAC_FIFO |
+ ((mode & SBMODE_16BITS) ? SBDSP_DMA_GENERIC16 :
+ SBDSP_DMA_GENERIC8),
+ ((mode & SBMODE_SIGNED) ? SBM_GENDAC_SIGNED : 0) |
+ ((mode & SBMODE_STEREO) ? SBM_GENDAC_STEREO : 0));
+
+ /* Write the length of transfer */
+ dmabuffsize = (dmabuffsize >> 2) - 1;
+ __sb_dsp_out(dmabuffsize);
+ __sb_dsp_out(dmabuffsize >> 8);
+ } else {
+ __sb_dspreg_out(SBDSP_SET_TIMING, 256 - tc);
+ dmabuffsize = (dmabuffsize >> 1) - 1;
+ if (sb.dspver >= SBVER_20) { /* SB 2.0/Pro */
+ /* Set stereo mode */
+ __sb_stereo((mode & SBMODE_STEREO) ? TRUE : FALSE);
+ __sb_dspreg_outwlh(SBDSP_SET_DMA_BLOCK, dmabuffsize);
+ if (sb.dspver >= SBVER_PRO)
+ __sb_dsp_out(SBDSP_HS_DMA_DAC8_AUTO);
+ else
+ __sb_dsp_out(SBDSP_DMA_PCM8_AUTO);
+ } else { /* Original SB */
+ /* Start DMA->DAC transfer */
+ __sb_dspreg_outwlh(SBDSP_DMA_PCM8, dmabuffsize);
+ }
+ }
+
+ return TRUE;
+}
+
+/* Stop playing from DMA buffer */
+void sb_stop_dma()
+{
+ if (!sb.dma_buff)
+ return;
+
+ if (sb.mode & SBMODE_16BITS)
+ __sb_dsp_out(SBDSP_DMA_HALT16);
+ else
+ __sb_dsp_out(SBDSP_DMA_HALT8);
+
+ dma_disable(sb.dma_buff->channel);
+ dma_free(sb.dma_buff);
+ sb.dma_buff = NULL;
+}
+
+/* Query current position/total size of the DMA buffer */
+void sb_query_dma(unsigned int *dma_size, unsigned int *dma_pos)
+{
+ unsigned int dma_left;
+ *dma_size = sb.dma_buff->size;
+ /* It can happen we try to read DMA count when HI/LO bytes will be
+ inconsistent */
+ for (;;) {
+ unsigned int dma_left_test;
+ dma_clear_ff(sb.dma_buff->channel);
+ dma_left_test = dma_get_count(sb.dma_buff->channel);
+ dma_left = dma_get_count(sb.dma_buff->channel);
+ if ((dma_left >= dma_left_test) && (dma_left - dma_left_test < 10))
+ break;
+ }
+ *dma_pos = *dma_size - dma_left;
+}
+
+#endif /* DRV_SB */
+
+/* ex:set ts=4: */
projects / dosdemo / blobdiff