415 lines
8.2 KiB
C
415 lines
8.2 KiB
C
/*********************************************************************
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*
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* msnd.c - Driver Base
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*
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* Turtle Beach MultiSound Sound Card Driver for Linux
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*
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* Copyright (C) 1998 Andrew Veliath
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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********************************************************************/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/types.h>
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#include <linux/delay.h>
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <linux/spinlock.h>
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#include <asm/irq.h>
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#include "msnd.h"
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#define LOGNAME "msnd"
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#define MSND_MAX_DEVS 4
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static multisound_dev_t *devs[MSND_MAX_DEVS];
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static int num_devs;
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int msnd_register(multisound_dev_t *dev)
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{
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int i;
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for (i = 0; i < MSND_MAX_DEVS; ++i)
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if (devs[i] == NULL)
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break;
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if (i == MSND_MAX_DEVS)
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return -ENOMEM;
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devs[i] = dev;
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++num_devs;
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return 0;
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}
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void msnd_unregister(multisound_dev_t *dev)
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{
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int i;
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for (i = 0; i < MSND_MAX_DEVS; ++i)
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if (devs[i] == dev)
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break;
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if (i == MSND_MAX_DEVS) {
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printk(KERN_WARNING LOGNAME ": Unregistering unknown device\n");
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return;
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}
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devs[i] = NULL;
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--num_devs;
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}
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void msnd_init_queue(void __iomem *base, int start, int size)
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{
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writew(PCTODSP_BASED(start), base + JQS_wStart);
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writew(PCTODSP_OFFSET(size) - 1, base + JQS_wSize);
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writew(0, base + JQS_wHead);
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writew(0, base + JQS_wTail);
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}
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void msnd_fifo_init(msnd_fifo *f)
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{
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f->data = NULL;
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}
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void msnd_fifo_free(msnd_fifo *f)
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{
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vfree(f->data);
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f->data = NULL;
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}
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int msnd_fifo_alloc(msnd_fifo *f, size_t n)
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{
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msnd_fifo_free(f);
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f->data = vmalloc(n);
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f->n = n;
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f->tail = 0;
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f->head = 0;
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f->len = 0;
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if (!f->data)
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return -ENOMEM;
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return 0;
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}
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void msnd_fifo_make_empty(msnd_fifo *f)
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{
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f->len = f->tail = f->head = 0;
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}
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int msnd_fifo_write_io(msnd_fifo *f, char __iomem *buf, size_t len)
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{
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int count = 0;
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while ((count < len) && (f->len != f->n)) {
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int nwritten;
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if (f->head <= f->tail) {
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nwritten = len - count;
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if (nwritten > f->n - f->tail)
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nwritten = f->n - f->tail;
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}
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else {
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nwritten = f->head - f->tail;
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if (nwritten > len - count)
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nwritten = len - count;
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}
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memcpy_fromio(f->data + f->tail, buf, nwritten);
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count += nwritten;
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buf += nwritten;
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f->len += nwritten;
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f->tail += nwritten;
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f->tail %= f->n;
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}
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return count;
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}
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int msnd_fifo_write(msnd_fifo *f, const char *buf, size_t len)
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{
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int count = 0;
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while ((count < len) && (f->len != f->n)) {
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int nwritten;
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if (f->head <= f->tail) {
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nwritten = len - count;
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if (nwritten > f->n - f->tail)
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nwritten = f->n - f->tail;
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}
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else {
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nwritten = f->head - f->tail;
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if (nwritten > len - count)
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nwritten = len - count;
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}
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memcpy(f->data + f->tail, buf, nwritten);
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count += nwritten;
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buf += nwritten;
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f->len += nwritten;
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f->tail += nwritten;
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f->tail %= f->n;
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}
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return count;
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}
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int msnd_fifo_read_io(msnd_fifo *f, char __iomem *buf, size_t len)
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{
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int count = 0;
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while ((count < len) && (f->len > 0)) {
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int nread;
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if (f->tail <= f->head) {
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nread = len - count;
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if (nread > f->n - f->head)
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nread = f->n - f->head;
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}
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else {
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nread = f->tail - f->head;
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if (nread > len - count)
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nread = len - count;
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}
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memcpy_toio(buf, f->data + f->head, nread);
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count += nread;
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buf += nread;
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f->len -= nread;
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f->head += nread;
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f->head %= f->n;
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}
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return count;
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}
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int msnd_fifo_read(msnd_fifo *f, char *buf, size_t len)
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{
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int count = 0;
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while ((count < len) && (f->len > 0)) {
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int nread;
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if (f->tail <= f->head) {
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nread = len - count;
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if (nread > f->n - f->head)
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nread = f->n - f->head;
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}
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else {
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nread = f->tail - f->head;
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if (nread > len - count)
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nread = len - count;
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}
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memcpy(buf, f->data + f->head, nread);
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count += nread;
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buf += nread;
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f->len -= nread;
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f->head += nread;
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f->head %= f->n;
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}
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return count;
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}
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static int msnd_wait_TXDE(multisound_dev_t *dev)
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{
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register unsigned int io = dev->io;
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register int timeout = 1000;
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while(timeout-- > 0)
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if (msnd_inb(io + HP_ISR) & HPISR_TXDE)
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return 0;
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return -EIO;
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}
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static int msnd_wait_HC0(multisound_dev_t *dev)
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{
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register unsigned int io = dev->io;
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register int timeout = 1000;
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while(timeout-- > 0)
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if (!(msnd_inb(io + HP_CVR) & HPCVR_HC))
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return 0;
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return -EIO;
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}
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int msnd_send_dsp_cmd(multisound_dev_t *dev, BYTE cmd)
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{
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unsigned long flags;
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spin_lock_irqsave(&dev->lock, flags);
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if (msnd_wait_HC0(dev) == 0) {
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msnd_outb(cmd, dev->io + HP_CVR);
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spin_unlock_irqrestore(&dev->lock, flags);
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return 0;
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}
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spin_unlock_irqrestore(&dev->lock, flags);
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printk(KERN_DEBUG LOGNAME ": Send DSP command timeout\n");
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return -EIO;
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}
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int msnd_send_word(multisound_dev_t *dev, unsigned char high,
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unsigned char mid, unsigned char low)
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{
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register unsigned int io = dev->io;
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if (msnd_wait_TXDE(dev) == 0) {
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msnd_outb(high, io + HP_TXH);
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msnd_outb(mid, io + HP_TXM);
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msnd_outb(low, io + HP_TXL);
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return 0;
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}
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printk(KERN_DEBUG LOGNAME ": Send host word timeout\n");
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return -EIO;
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}
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int msnd_upload_host(multisound_dev_t *dev, char *bin, int len)
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{
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int i;
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if (len % 3 != 0) {
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printk(KERN_WARNING LOGNAME ": Upload host data not multiple of 3!\n");
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return -EINVAL;
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}
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for (i = 0; i < len; i += 3)
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if (msnd_send_word(dev, bin[i], bin[i + 1], bin[i + 2]) != 0)
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return -EIO;
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msnd_inb(dev->io + HP_RXL);
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msnd_inb(dev->io + HP_CVR);
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return 0;
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}
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int msnd_enable_irq(multisound_dev_t *dev)
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{
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unsigned long flags;
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if (dev->irq_ref++)
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return 0;
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printk(KERN_DEBUG LOGNAME ": Enabling IRQ\n");
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spin_lock_irqsave(&dev->lock, flags);
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if (msnd_wait_TXDE(dev) == 0) {
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msnd_outb(msnd_inb(dev->io + HP_ICR) | HPICR_TREQ, dev->io + HP_ICR);
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if (dev->type == msndClassic)
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msnd_outb(dev->irqid, dev->io + HP_IRQM);
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msnd_outb(msnd_inb(dev->io + HP_ICR) & ~HPICR_TREQ, dev->io + HP_ICR);
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msnd_outb(msnd_inb(dev->io + HP_ICR) | HPICR_RREQ, dev->io + HP_ICR);
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enable_irq(dev->irq);
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msnd_init_queue(dev->DSPQ, dev->dspq_data_buff, dev->dspq_buff_size);
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spin_unlock_irqrestore(&dev->lock, flags);
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return 0;
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}
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spin_unlock_irqrestore(&dev->lock, flags);
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printk(KERN_DEBUG LOGNAME ": Enable IRQ failed\n");
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return -EIO;
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}
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int msnd_disable_irq(multisound_dev_t *dev)
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{
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unsigned long flags;
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if (--dev->irq_ref > 0)
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return 0;
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if (dev->irq_ref < 0)
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printk(KERN_DEBUG LOGNAME ": IRQ ref count is %d\n", dev->irq_ref);
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printk(KERN_DEBUG LOGNAME ": Disabling IRQ\n");
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spin_lock_irqsave(&dev->lock, flags);
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if (msnd_wait_TXDE(dev) == 0) {
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msnd_outb(msnd_inb(dev->io + HP_ICR) & ~HPICR_RREQ, dev->io + HP_ICR);
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if (dev->type == msndClassic)
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msnd_outb(HPIRQ_NONE, dev->io + HP_IRQM);
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disable_irq(dev->irq);
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spin_unlock_irqrestore(&dev->lock, flags);
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return 0;
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}
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spin_unlock_irqrestore(&dev->lock, flags);
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printk(KERN_DEBUG LOGNAME ": Disable IRQ failed\n");
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return -EIO;
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}
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#ifndef LINUX20
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EXPORT_SYMBOL(msnd_register);
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EXPORT_SYMBOL(msnd_unregister);
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EXPORT_SYMBOL(msnd_init_queue);
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EXPORT_SYMBOL(msnd_fifo_init);
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EXPORT_SYMBOL(msnd_fifo_free);
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EXPORT_SYMBOL(msnd_fifo_alloc);
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EXPORT_SYMBOL(msnd_fifo_make_empty);
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EXPORT_SYMBOL(msnd_fifo_write_io);
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EXPORT_SYMBOL(msnd_fifo_read_io);
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EXPORT_SYMBOL(msnd_fifo_write);
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EXPORT_SYMBOL(msnd_fifo_read);
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EXPORT_SYMBOL(msnd_send_dsp_cmd);
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EXPORT_SYMBOL(msnd_send_word);
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EXPORT_SYMBOL(msnd_upload_host);
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EXPORT_SYMBOL(msnd_enable_irq);
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EXPORT_SYMBOL(msnd_disable_irq);
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#endif
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#ifdef MODULE
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MODULE_AUTHOR ("Andrew Veliath <andrewtv@usa.net>");
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MODULE_DESCRIPTION ("Turtle Beach MultiSound Driver Base");
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MODULE_LICENSE("GPL");
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int init_module(void)
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{
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return 0;
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}
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void cleanup_module(void)
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{
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}
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#endif
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