path: root/sound/oss/btaudio.c

/*
    btaudio - bt878 audio dma driver for linux 2.4.x

    (c) 2000-2002 Gerd Knorr <kraxel@bytesex.org>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/pci.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/sound.h>
#include <linux/soundcard.h>
#include <linux/slab.h>
#include <linux/kdev_t.h>
#include <linux/mutex.h>

#include <asm/uaccess.h>
#include <asm/io.h>


/* mmio access */
#define btwrite(dat,adr)    writel((dat), (bta->mmio+(adr)))
#define btread(adr)         readl(bta->mmio+(adr))

#define btand(dat,adr)      btwrite((dat) & btread(adr), adr)
#define btor(dat,adr)       btwrite((dat) | btread(adr), adr)
#define btaor(dat,mask,adr) btwrite((dat) | ((mask) & btread(adr)), adr)

/* registers (shifted because bta->mmio is long) */
#define REG_INT_STAT      (0x100 >> 2)
#define REG_INT_MASK      (0x104 >> 2)
#define REG_GPIO_DMA_CTL  (0x10c >> 2)
#define REG_PACKET_LEN    (0x110 >> 2)
#define REG_RISC_STRT_ADD (0x114 >> 2)
#define REG_RISC_COUNT    (0x120 >> 2)

/* IRQ bits - REG_INT_(STAT|MASK) */
#define IRQ_SCERR         (1 << 19)
#define IRQ_OCERR         (1 << 18)
#define IRQ_PABORT        (1 << 17)
#define IRQ_RIPERR        (1 << 16)
#define IRQ_PPERR         (1 << 15)
#define IRQ_FDSR          (1 << 14)
#define IRQ_FTRGT         (1 << 13)
#define IRQ_FBUS          (1 << 12)
#define IRQ_RISCI         (1 << 11)
#define IRQ_OFLOW         (1 <<  3)

#define IRQ_BTAUDIO       (IRQ_SCERR | IRQ_OCERR | IRQ_PABORT | IRQ_RIPERR |\
			   IRQ_PPERR | IRQ_FDSR  | IRQ_FTRGT  | IRQ_FBUS   |\
			   IRQ_RISCI)

/* REG_GPIO_DMA_CTL bits */
#define DMA_CTL_A_PWRDN   (1 << 26)
#define DMA_CTL_DA_SBR    (1 << 14)
#define DMA_CTL_DA_ES2    (1 << 13)
#define DMA_CTL_ACAP_EN   (1 <<  4)
#define DMA_CTL_RISC_EN   (1 <<  1)
#define DMA_CTL_FIFO_EN   (1 <<  0)

/* RISC instructions */
#define RISC_WRITE        (0x01 << 28)
#define RISC_JUMP         (0x07 << 28)
#define RISC_SYNC         (0x08 << 28)

/* RISC bits */
#define RISC_WR_SOL       (1 << 27)
#define RISC_WR_EOL       (1 << 26)
#define RISC_IRQ          (1 << 24)
#define RISC_SYNC_RESYNC  (1 << 15)
#define RISC_SYNC_FM1     0x06
#define RISC_SYNC_VRO     0x0c

#define HWBASE_AD (448000)

/* -------------------------------------------------------------- */

struct btaudio {
	/* linked list */
	struct btaudio *next;

	/* device info */
	int            dsp_digital;
	int            dsp_analog;
	int            mixer_dev;
	struct pci_dev *pci;
	unsigned int   irq;
	unsigned long  mem;
	unsigned long  __iomem *mmio;

	/* locking */
	int            users;
	struct mutex lock;

	/* risc instructions */
	unsigned int   risc_size;
	unsigned long  *risc_cpu;
	dma_addr_t     risc_dma;

	/* audio data */
	unsigned int   buf_size;
	unsigned char  *buf_cpu;
	dma_addr_t     buf_dma;

	/* buffer setup */
	int line_bytes;
	int line_count;
	int block_bytes;
	int block_count;

	/* read fifo management */
	int recording;
	int dma_block;
	int read_offset;
	int read_count;
	wait_queue_head_t readq;

	/* settings */
	int gain[3];
	int source;
	int bits;
	int decimation;
	int mixcount;
	int sampleshift;
	int channels;
	int analog;
	int rate;
};

struct cardinfo {
	char *name;
	int rate;
};

static struct btaudio *btaudios;
static unsigned int debug;
static unsigned int irq_debug;

/* -------------------------------------------------------------- */

#define BUF_DEFAULT 128*1024
#define BUF_MIN         8192

static int alloc_buffer(struct btaudio *bta)
{
	if (NULL == bta->buf_cpu) {
		for (bta->buf_size = BUF_DEFAULT; bta->buf_size >= BUF_MIN;
		     bta->buf_size = bta->buf_size >> 1) {
			bta->buf_cpu = pci_alloc_consistent
				(bta->pci, bta->buf_size, &bta->buf_dma);
			if (NULL != bta->buf_cpu)
				break;
		}
		if (NULL == bta->buf_cpu)
			return -ENOMEM;
		memset(bta->buf_cpu,0,bta->buf_size);
	}
	if (NULL == bta->risc_cpu) {
		bta->risc_size = PAGE_SIZE;
		bta->risc_cpu = pci_alloc_consistent
			(bta->pci, bta