// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Patch routines for the emu8000 (AWE32/64)
*
* Copyright (C) 1999 Steve Ratcliffe
* Copyright (C) 1999-2000 Takashi Iwai <[email protected]>
*/
#include "emu8000_local.h"
#include <linux/sched/signal.h>
#include <linux/uaccess.h>
#include <linux/moduleparam.h>
static int emu8000_reset_addr;
module_param(emu8000_reset_addr, int, 0444);
MODULE_PARM_DESC(emu8000_reset_addr, "reset write address at each time (makes slowdown)");
/*
* Open up channels.
*/
static int
snd_emu8000_open_dma(struct snd_emu8000 *emu, int write)
{
int i;
/* reserve all 30 voices for loading */
for (i = 0; i < EMU8000_DRAM_VOICES; i++) {
snd_emux_lock_voice(emu->emu, i);
snd_emu8000_dma_chan(emu, i, write);
}
/* assign voice 31 and 32 to ROM */
EMU8000_VTFT_WRITE(emu, 30, 0);
EMU8000_PSST_WRITE(emu, 30, 0x1d8);
EMU8000_CSL_WRITE(emu, 30, 0x1e0);
EMU8000_CCCA_WRITE(emu, 30, 0x1d8);
EMU8000_VTFT_WRITE(emu, 31, 0);
EMU8000_PSST_WRITE(emu, 31, 0x1d8);
EMU8000_CSL_WRITE(emu, 31, 0x1e0);
EMU8000_CCCA_WRITE(emu, 31, 0x1d8);
return 0;
}
/*
* Close all dram channels.
*/
static void
snd_emu8000_close_dma(struct snd_emu8000 *emu)
{
int i;
for (i = 0; i < EMU8000_DRAM_VOICES; i++) {
snd_emu8000_dma_chan(emu, i, EMU8000_RAM_CLOSE);
snd_emux_unlock_voice(emu->emu, i);
}
}
/*
*/
#define BLANK_LOOP_START 4
#define BLANK_LOOP_END 8
#define BLANK_LOOP_SIZE 12
#define BLANK_HEAD_SIZE 48
/*
* Read a word from userland, taking care of conversions from
* 8bit samples etc.
*/
static unsigned short
read_word(const void __user *buf, int offset, int mode)
{
unsigned short c;
if (mode & SNDRV_SFNT_SAMPLE_8BITS) {
unsigned char cc;
get_user(cc, (unsigned char __user *)buf + offset);
c = cc << 8; /* convert 8bit -> 16bit */
} else {
#ifdef SNDRV_LITTLE_ENDIAN
get_user(c, (unsigned short __user *)buf + offset);
#else
unsigned short cc;
get_user(cc, (unsigned short __user *)buf + offset);
c = swab16(cc);
#endif
}
if (mode & SNDRV_SFNT_SAMPLE_UNSIGNED)
c ^= 0x8000; /* unsigned -> signed */
return c;
}
/*
*/
static void
snd_emu8000_write_wait(struct snd_emu8000 *emu)
{
while ((EMU8000_SMALW_READ(emu) & 0x80000000) != 0) {
schedule_timeout_interruptible(1);
if (signal_pending(current))
break;
}
}
/*
* write sample word data
*
* You should not have to keep resetting the address each time
* as the chip is supposed to step on the next address automatically.
* It mostly does, but during writes of some samples at random it
* completely loses words (every one in 16 roughly but with no
* obvious pattern).
*
* This is therefore much slower than need be, but is at least
* working.
*/
static inline void
write_word(struct snd_emu8000 *emu, int *offset, unsigned short data)
{
if (emu8000_reset_addr) {
if (emu8000_reset_addr > 1)
snd_emu8000_write_wait(emu);
EMU8000_SMALW_WRITE(emu, *offset);
}
EMU8000_SMLD_WRITE(emu, data);
*offset += 1;
}
/*
* Write the sample to EMU800 memory. This routine is invoked out of
* the generic soundfont routines as a callback.
*/
int
snd_emu8000_sample_new(struct snd_emux *rec, struct snd_sf_sample *sp,
struct snd_util_memhdr *hdr,
const void __user *data, long count)
{
int i;
int rc;
int offset;
int truesize;
int dram_offset, dram_start;
struct snd_emu8000 *emu;
emu = rec->hw;
if (snd_BUG_ON(!sp))
return -EINVAL;
/* compute true data size to be loaded */
truesize = sp->v.size;
if (sp->v.mode_flags & (SNDRV_SFNT_SAMPLE_BIDIR_LOOP|SNDRV_SFNT_SAMPLE_REVERSE_LOOP))
truesize += sp->v.loopend - sp->v.loopstart;
if (sp->v.mode_flags & SNDRV_SFNT_SAMPLE_NO_BLANK)
truesize += BLANK_LOOP_SIZE;
sp->block = snd_util_mem_alloc(hdr, truesize * 2);
if (sp->block == NULL) {
/* not ENOMEM (for compatibility) */
return -ENOSPC;
}
if (sp->v.mode_flags & SNDRV_SFNT_SAMPLE_8BITS) {
if (!access_ok(data, sp->v.size))
return -EFAULT;
} else {
if (!access_ok(data, sp->v.size * 2))
return -EFAULT;
}
/* dram position (in word) -- mem_offset is byte */
dram_offset = EMU8000_DRAM_OFFSET + (sp->block->offset >> 1);
dram_start = dram_offset;
/* set the total size (store onto obsolete checksum value) */
sp->v.truesize = truesize * 2; /* in bytes */
snd_emux_terminate_all(emu->emu);
rc = snd_emu8000_open_dma(emu, EMU8000_RAM_WRITE);
if (rc)
return rc;
/* Set the address to start writing at */
snd_emu8000_write_wait(emu);
EMU8000_SMALW_WRITE(emu, dram_offset);
/*snd_emu8000_init_fm(emu);*/
#if 0
/* first block - write 48 samples for silence */
if (! sp->block->offset) {
for (i = 0; i < BLANK_HEAD_SIZE; i++) {
write_word(emu, &dram_offset, 0);
}
}
#endif
offset = 0;
for (i = 0; i < sp->v.size; i++) {
unsigned short s;
s = read_word(data, offset, sp->v.mode_flags);
offset++;
write_word(emu, &dram_offset, s);
/* we may take too long time in this loop.
* so give controls back to kernel if needed.
*/
cond_resched();
if (i == sp->v.loopend &&
(sp->v.mode_flags & (SNDRV_SFNT_SAMPLE_BIDIR_LOOP|SNDRV_SFNT_SAMPLE_REVERSE_LOOP)))
{
int looplen = sp->v.loopend - sp->v.loopstart;
int k;
/* copy reverse loop */
for (k = 1; k <= looplen; k++) {
s = read_word(data, offset - k, sp->v.mode_flags);
write_word(emu, &dram_offset, s);
}
if (sp->v.mode_flags & SNDRV_SFNT_SAMPLE_BIDIR_LOOP) {
sp->v.loopend += looplen;
} else {
sp->v.loopstart += looplen;
sp->v.loopend += looplen;
}
sp->v.end += looplen;
}
}
/* if no blank loop is attached in the sample, add it */
if (sp->v.mode_flags & SNDRV_SFNT_SAMPLE_NO_BLANK) {
for (i = 0; i < BLANK_LOOP_SIZE; i++) {
write_word(emu, &dram_offset, 0);
}
if (sp->v.mode_flags & SNDRV_SFNT_SAMPLE_SINGLESHOT) {
sp->v.loopstart = sp->v.end + BLANK_LOOP_START;
sp->v.loopend = sp->v.end + BLANK_LOOP_END;
}
}
/* add dram offset */
sp->v.start += dram_start;
sp->v.end += dram_start;
sp->v.loopstart += dram_start;
sp->v.loopend += dram_start;
snd_emu8000_close_dma(emu);
snd_emu8000_init_fm(emu);
return 0;
}
/*
* free a sample block
*/
int
snd_emu8000_sample_free(struct snd_emux *rec, struct snd_sf_sample *sp,
struct snd_util_memhdr *hdr)
{
if (sp->block) {
snd_util_mem_free(hdr, sp->block);
sp->block = NULL;
}
return 0;
}
/*
* sample_reset callback - terminate voices
*/
void
snd_emu8000_sample_reset(struct snd_emux *rec)
{
snd_emux_terminate_all(rec);
}
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