Date: Sat, 15 Feb 1997 17:08:42 +0100 (MET)
From: Tomas Berndtsson <tobe@lysator.liu.se>
To: Linux-m68k List <linux-m68k@phil.uni-sb.de>
Subject: L68K: dsp56k driver for 2.1.26
Sender: owner-linux-m68k@phil.uni-sb.de
Reply-To: linux-m68k@phil.uni-sb.de

Hello,

I've fixed the dsp56k driver so it patches fine for 2.1.26.
It's a patch to the clean linux tree.

Greetings,

Tomas


--- linux-2.1.26/drivers/char/dsp56k.c.orig	Sat Feb 15 17:28:11 1997
+++ linux-2.1.26/drivers/char/dsp56k.c	Sat Feb 15 17:36:53 1997
@@ -0,0 +1,575 @@
+/*
+ * The DSP56001 Device Driver, saviour of the Free World(tm)
+ *
+ * Authors: Fredrik Noring   <noring@lysator.liu.se>
+ *          lars brinkhoff   <f93labr@dd.chalmers.se>
+ *          Tomas Berndtsson <tobe@lysator.liu.se>
+ *
+ * First version May 1996
+ *
+ * History:
+ *  97-01-29   Tomas Berndtsson,
+ *               Integrated with Linux 2.1.21 kernel sources.
+ *  97-02-15   Tomas Berndtsson,
+ *               Fixed for kernel 2.1.26
+ *
+ * BUGS:
+ *  Hmm... there must be something here :)
+ *
+ * Copyright (C) 1996,1997 Fredrik Noring, lars brinkhoff & Tomas Berndtsson
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/malloc.h>	/* for kmalloc() and kfree() */
+#include <linux/sched.h>	/* for struct wait_queue etc */
+#include <linux/major.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/delay.h>	/* guess what */
+#include <linux/fs.h>
+#include <linux/mm.h>
+
+#include <asm/segment.h>
+#include <asm/atarihw.h>
+#include <asm/traps.h>
+#include <asm/uaccess.h>	/* For put_user and get_user */
+
+#include <asm/dsp56k.h>
+
+/* minor devices */
+#define DSP56K_DEV_56001        0    /* The only device so far */
+
+#define TIMEOUT    10   /* Host port timeout in number of tries */
+#define MAXIO    2048   /* Maximum number of words before sleep */
+#define DSP56K_MAX_BINARY_LENGTH (3*64*1024)
+
+#define DSP56K_TX_INT_ON	dsp56k_host_interface.icr |=  DSP56K_ICR_TREQ
+#define DSP56K_RX_INT_ON	dsp56k_host_interface.icr |=  DSP56K_ICR_RREQ
+#define DSP56K_TX_INT_OFF	dsp56k_host_interface.icr &= ~DSP56K_ICR_TREQ
+#define DSP56K_RX_INT_OFF	dsp56k_host_interface.icr &= ~DSP56K_ICR_RREQ
+
+#define DSP56K_TRANSMIT		(dsp56k_host_interface.isr & DSP56K_ISR_TXDE)
+#define DSP56K_RECEIVE		(dsp56k_host_interface.isr & DSP56K_ISR_RXDF)
+
+#define max(a,b) ((a) > (b) ? (a) : (b))
+#define min(a,b) ((a) < (b) ? (a) : (b))
+
+#define wait_some(n) \
+{ \
+	current->state = TASK_INTERRUPTIBLE; \
+	current->timeout = jiffies + n; \
+	schedule(); \
+}
+
+#define handshake(count, maxio, timeout, ENABLE, f) \
+{ \
+	long i, t, m; \
+	while (count > 0) { \
+		m = min(count, maxio); \
+		for (i = 0; i < m; i++) { \
+			for (t = 0; t < timeout && !ENABLE; t++) \
+				wait_some(2); \
+			if(!ENABLE) \
+				return -EIO; \
+			f; \
+		} \
+		count -= m; \
+		if (m == maxio) wait_some(2); \
+	} \
+}
+
+#define tx_wait(n) \
+{ \
+	int t; \
+	for(t = 0; t < n && !DSP56K_TRANSMIT; t++) \
+		wait_some(1); \
+	if(!DSP56K_TRANSMIT) { \
+		return -EIO; \
+	} \
+}
+
+#define rx_wait(n) \
+{ \
+	int t; \
+	for(t = 0; t < n && !DSP56K_RECEIVE; t++) \
+		wait_some(1); \
+	if(!DSP56K_RECEIVE) { \
+		return -EIO; \
+	} \
+}
+
+/* DSP56001 bootstrap code */
+static char bootstrap[] = {
+	0x0c, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x60, 0xf4, 0x00, 0x00, 0x00, 0x4f, 0x61, 0xf4,
+	0x00, 0x00, 0x7e, 0xa9, 0x06, 0x2e, 0x80, 0x00, 0x00, 0x47,
+	0x07, 0xd8, 0x84, 0x07, 0x59, 0x84, 0x08, 0xf4, 0xa8, 0x00,
+	0x00, 0x04, 0x08, 0xf4, 0xbf, 0x00, 0x0c, 0x00, 0x00, 0xfe,
+	0xb8, 0x0a, 0xf0, 0x80, 0x00, 0x7e, 0xa9, 0x08, 0xf4, 0xa0,
+	0x00, 0x00, 0x01, 0x08, 0xf4, 0xbe, 0x00, 0x00, 0x00, 0x0a,
+	0xa9, 0x80, 0x00, 0x7e, 0xad, 0x08, 0x4e, 0x2b, 0x44, 0xf4,
+	0x00, 0x00, 0x00, 0x03, 0x44, 0xf4, 0x45, 0x00, 0x00, 0x01,
+	0x0e, 0xa0, 0x00, 0x0a, 0xa9, 0x80, 0x00, 0x7e, 0xb5, 0x08,
+	0x50, 0x2b, 0x0a, 0xa9, 0x80, 0x00, 0x7e, 0xb8, 0x08, 0x46,
+	0x2b, 0x44, 0xf4, 0x45, 0x00, 0x00, 0x02, 0x0a, 0xf0, 0xaa,
+	0x00, 0x7e, 0xc9, 0x20, 0x00, 0x45, 0x0a, 0xf0, 0xaa, 0x00,
+	0x7e, 0xd0, 0x06, 0xc6, 0x00, 0x00, 0x7e, 0xc6, 0x0a, 0xa9,
+	0x80, 0x00, 0x7e, 0xc4, 0x08, 0x58, 0x6b, 0x0a, 0xf0, 0x80,
+	0x00, 0x7e, 0xad, 0x06, 0xc6, 0x00, 0x00, 0x7e, 0xcd, 0x0a,
+	0xa9, 0x80, 0x00, 0x7e, 0xcb, 0x08, 0x58, 0xab, 0x0a, 0xf0,
+	0x80, 0x00, 0x7e, 0xad, 0x06, 0xc6, 0x00, 0x00, 0x7e, 0xd4,
+	0x0a, 0xa9, 0x80, 0x00, 0x7e, 0xd2, 0x08, 0x58, 0xeb, 0x0a,
+	0xf0, 0x80, 0x00, 0x7e, 0xad};
+static int sizeof_bootstrap = 375;
+
+
+static struct dsp56k_device {
+	int in_use;
+	long maxio, timeout;
+	int tx_wsize, rx_wsize;
+} dsp56k;
+
+static int dsp56k_reset(void)
+{
+	u_char status;
+	
+	/* Power down the DSP */
+	sound_ym.rd_data_reg_sel = 14;
+	status = sound_ym.rd_data_reg_sel & 0xef;
+	sound_ym.wd_data = status;
+	sound_ym.wd_data = status | 0x10;
+  
+	udelay(10);
+  
+	/* Power up the DSP */
+	sound_ym.rd_data_reg_sel = 14;
+	sound_ym.wd_data = sound_ym.rd_data_reg_sel & 0xef;
+
+	return 0;
+}
+
+static int dsp56k_upload(u_char *bin, int len)
+{
+	int i;
+	u_char *p;
+	
+	dsp56k_reset();
+  
+	p = bootstrap;
+	for (i = 0; i < sizeof_bootstrap/3; i++) {
+		/* tx_wait(10); */
+		dsp56k_host_interface.data.b[1] = *p++;
+		dsp56k_host_interface.data.b[2] = *p++;
+		dsp56k_host_interface.data.b[3] = *p++;
+	}
+	for (; i < 512; i++) {
+		/* tx_wait(10); */
+		dsp56k_host_interface.data.b[1] = 0;
+		dsp56k_host_interface.data.b[2] = 0;
+		dsp56k_host_interface.data.b[3] = 0;
+	}
+  
+	for (i = 0; i < len; i++) {
+		tx_wait(10);
+		get_user(dsp56k_host_interface.data.b[1], bin++);
+		get_user(dsp56k_host_interface.data.b[2], bin++);
+		get_user(dsp56k_host_interface.data.b[3], bin++);
+	}
+
+	tx_wait(10);
+	dsp56k_host_interface.data.l = 3;    /* Magic execute */
+
+	return 0;
+}
+
+static long dsp56k_read(struct inode *inode, struct file *file,
+			char *buf, unsigned long count)
+{
+	int dev = MINOR(inode->i_rdev) & 0x0f;
+
+	switch(dev)
+	{
+	case DSP56K_DEV_56001:
+	{
+
+		long n;
+
+		/* Don't do anything if nothing is to be done */
+		if (!count) return 0;
+
+		n = 0;
+		switch (dsp56k.rx_wsize) {
+		case 1:  /* 8 bit */
+		{
+			handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
+				  put_user(dsp56k_host_interface.data.b[3], buf+n++));
+			return n;
+		}
+		case 2:  /* 16 bit */
+		{
+			short *data;
+
+			count /= 2;
+			data = (short*) buf;
+			handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
+				  put_user(dsp56k_host_interface.data.w[1], data+n++));
+			return 2*n;
+		}
+		case 3:  /* 24 bit */
+		{
+			count /= 3;
+			handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
+				  put_user(dsp56k_host_interface.data.b[1], buf+n++);
+				  put_user(dsp56k_host_interface.data.b[2], buf+n++);
+				  put_user(dsp56k_host_interface.data.b[3], buf+n++));
+			return 3*n;
+		}
+		case 4:  /* 32 bit */
+		{
+			long *data;
+
+			count /= 4;
+			data = (long*) buf;
+			handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
+				  put_user(dsp56k_host_interface.data.l, data+n++));
+			return 4*n;
+		}
+		}
+		return -EFAULT;
+	}
+
+	default:
+		printk("DSP56k driver: Unknown minor device: %d\n", dev);
+		return -ENXIO;
+	}
+}
+
+static long dsp56k_write(struct inode *inode, struct file *file,
+			 const char *buf, unsigned long count)
+{
+	int dev = MINOR(inode->i_rdev) & 0x0f;
+
+	switch(dev)
+	{
+	case DSP56K_DEV_56001:
+	{
+		long n;
+
+		/* Don't do anything if nothing is to be done */
+		if (!count) return 0;
+
+		n = 0;
+		switch (dsp56k.tx_wsize) {
+		case 1:  /* 8 bit */
+		{
+			handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
+				  get_user(dsp56k_host_interface.data.b[3], buf+n++));
+			return n;
+		}
+		case 2:  /* 16 bit */
+		{
+			short *data;
+
+			count /= 2;
+			data = (short*) buf;
+			handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
+				  get_user(dsp56k_host_interface.data.w[1], data+n++));
+			return 2*n;
+		}
+		case 3:  /* 24 bit */
+		{
+			count /= 3;
+			handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
+				  get_user(dsp56k_host_interface.data.b[1], buf+n++);
+				  get_user(dsp56k_host_interface.data.b[2], buf+n++);
+				  get_user(dsp56k_host_interface.data.b[3], buf+n++));
+			return 3*n;
+		}
+		case 4:  /* 32 bit */
+		{
+			long *data;
+
+			count /= 4;
+			data = (long*) buf;
+			handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
+				  get_user(dsp56k_host_interface.data.l, data+n++));
+			return 4*n;
+		}
+		}
+
+		return -EFAULT;
+	}
+	default:
+		printk("DSP56k driver: Unknown minor device: %d\n", dev);
+		return -ENXIO;
+	}
+}
+
+static int dsp56k_ioctl(struct inode *inode, struct file *file,
+			unsigned int cmd, unsigned long arg)
+{
+	int dev = MINOR(inode->i_rdev) & 0x0f;
+
+	switch(dev)
+	{
+	case DSP56K_DEV_56001:
+
+		switch(cmd) {
+		case DSP56K_UPLOAD:
+		{
+			char *bin;
+			int r, len;
+			struct dsp56k_upload *binary = (struct dsp56k_upload *) arg;
+    
+			if(get_user(len, &binary->len) < 0)
+				return -EFAULT;
+			if(get_user(bin, &binary->bin) < 0)
+				return -EFAULT;
+		
+			if (len == 0) {
+				return -EINVAL;      /* nothing to upload?!? */
+			}
+			if (len > DSP56K_MAX_BINARY_LENGTH) {
+				return -EINVAL;
+			}
+    
+			r = dsp56k_upload(bin, len);
+			if (r < 0) {
+				return r;
+			}
+    
+			break;
+		}
+		case DSP56K_SET_TX_WSIZE:
+			if (arg > 4 || arg < 1)
+				return -EINVAL;
+			dsp56k.tx_wsize = (int) arg;
+			break;
+		case DSP56K_SET_RX_WSIZE:
+			if (arg > 4 || arg < 1)
+				return -EINVAL;
+			dsp56k.rx_wsize = (int) arg;
+			break;
+		case DSP56K_HOST_FLAGS:
+		{
+			int dir, out, status;
+			struct dsp56k_host_flags *hf = (struct dsp56k_host_flags*) arg;
+    
+			if(get_user(dir, &hf->dir) < 0)
+				return -EFAULT;
+			if(get_user(out, &hf->out) < 0)
+				return -EFAULT;
+
+			if ((dir & 0x1) && (out & 0x1))
+				dsp56k_host_interface.icr |= DSP56K_ICR_HF0;
+			else if (dir & 0x1)
+				dsp56k_host_interface.icr &= ~DSP56K_ICR_HF0;
+			if ((dir & 0x2) && (out & 0x2))
+				dsp56k_host_interface.icr |= DSP56K_ICR_HF1;
+			else if (dir & 0x2)
+				dsp56k_host_interface.icr &= ~DSP56K_ICR_HF1;
+
+			status = 0;
+			if (dsp56k_host_interface.icr & DSP56K_ICR_HF0) status |= 0x1;
+			if (dsp56k_host_interface.icr & DSP56K_ICR_HF1) status |= 0x2;
+			if (dsp56k_host_interface.isr & DSP56K_ISR_HF2) status |= 0x4;
+			if (dsp56k_host_interface.isr & DSP56K_ISR_HF3) status |= 0x8;
+
+			if(put_user(status, &hf->status) < 0)
+				return -EFAULT;
+			break;
+		}
+		case DSP56K_HOST_CMD:
+			if (arg > 31 || arg < 0)
+				return -EINVAL;
+			dsp56k_host_interface.cvr = (u_char)((arg & DSP56K_CVR_HV_MASK) |
+							     DSP56K_CVR_HC);
+			break;
+		default:
+			return -EINVAL;
+		}
+		return 0;
+
+	default:
+		printk("DSP56k driver: Unknown minor device: %d\n", dev);
+		return -ENXIO;
+	}
+}
+
+/* As of 2.1.26 this should be dsp56k_poll,
+ * but how do I then check device minor number?
+ * Do I need this function at all???
+ */
+#ifdef 0
+static int dsp56k_select(struct inode *inode, struct file *file, int sel_type,
+			 select_table *wait)
+{
+	int dev = MINOR(inode->i_rdev) & 0x0f;
+
+	switch(dev)
+	{
+	case DSP56K_DEV_56001:
+
+		switch(sel_type) {
+		case SEL_IN:		/* read */
+			return 1;
+		case SEL_OUT:		/* write */
+			return 1;
+		default:
+			return 1;
+		}
+
+	default:
+		printk("DSP56k driver: Unknown minor device: %d\n", dev);
+		return -ENXIO;
+	}
+}
+#endif
+
+static int dsp56k_open(struct inode *inode, struct file *file)
+{
+	int dev = MINOR(inode->i_rdev) & 0x0f;
+
+	switch(dev)
+	{
+	case DSP56K_DEV_56001:
+
+		if (dsp56k.in_use)
+			return -EBUSY;
+
+		dsp56k.in_use = 1;
+		dsp56k.timeout = TIMEOUT;
+		dsp56k.maxio = MAXIO;
+		dsp56k.rx_wsize = dsp56k.tx_wsize = 4; 
+
+		DSP56K_TX_INT_OFF;
+		DSP56K_RX_INT_OFF;
+
+		/* Zero host flags */
+		dsp56k_host_interface.icr &= ~DSP56K_ICR_HF0;
+		dsp56k_host_interface.icr &= ~DSP56K_ICR_HF1;
+
+		break;
+
+	default:
+		printk("DSP56k driver: Unknown minor device: %d\n", dev);
+		return -ENXIO;
+	}
+
+#ifdef MODULE
+	MOD_INC_USE_COUNT;
+#endif /* MODULE */
+
+	return 0;
+}
+
+static void dsp56k_release(struct inode *inode, struct file *file)
+{
+	int dev = MINOR(inode->i_rdev) & 0x0f;
+
+	switch(dev)
+	{
+	case DSP56K_DEV_56001:
+
+		dsp56k.in_use = 0;
+
+		break;
+	default:
+		printk("DSP56k driver: Unknown minor device: %d\n", dev);
+		return;
+	}
+
+#ifdef MODULE
+	MOD_DEC_USE_COUNT;
+#endif /* MODULE */
+}
+
+static struct file_operations dsp56k_fops = {
+	NULL,    /* no special dsp56k_lseek */
+	dsp56k_read,
+	dsp56k_write,
+	NULL,    /* no special dsp56k_readdir */
+	NULL,    /* dsp56k_poll? */
+	dsp56k_ioctl,
+	NULL,    /* no special dsp56k_mmap */
+	dsp56k_open,
+	dsp56k_release,
+	NULL,    /* no special dsp56k_fsync */
+	NULL,    /* no special dsp56k_fasync */
+	NULL,    /* no special dsp56k_check_media_change */
+	NULL     /* no special dsp56k_revalidate */
+};
+
+
+/****** Init and module functions ******/
+
+static int init_error = 0;
+
+void dsp56k_init(void)
+{
+	if(!ATARIHW_PRESENT(DSP56K)) {
+		init_error = 1;
+		printk("DSP56k driver: Hardware not present\n");
+		return;
+	}
+
+#ifndef MODULE
+	if(register_chrdev(DSP56K_MAJOR, "dsp56k", &dsp56k_fops)) {
+		printk("DSP56k driver: Unable to register driver\n");
+		return;
+	}
+#endif /* !MODULE */
+
+	dsp56k.in_use = 0;
+
+	printk("DSP56k driver installed\n");
+}
+
+#ifdef MODULE
+int init_module(void)
+{
+	int r;
+
+	init_error = 0;
+	dsp56k_init();
+	if(init_error)
+		return -EPERM;
+
+	r = register_chrdev(DSP56K_MAJOR, "dsp56k", &dsp56k_fops);
+	if(r) {
+		printk("DSP56k driver: Unable to register driver\n");
+		return r;
+	}
+	
+	return 0;
+}
+
+void cleanup_module(void)
+{
+	unregister_chrdev(DSP56K_MAJOR, "dsp56k");
+}
+#endif /* MODULE */
--- linux-2.1.26/include/asm-m68k/dsp56k.h.orig	Fri Feb 14 22:29:37 1997
+++ linux-2.1.26/include/asm-m68k/dsp56k.h	Fri Feb 14 22:29:37 1997
@@ -0,0 +1,35 @@
+/*
+ * linux/include/asm-m68k/dsp56k.h - defines and declarations for
+ *                                   DSP56k device driver
+ *
+ * Copyright (C) 1996,1997 Fredrik Noring, lars brinkhoff & Tomas Berndtsson
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+
+/* Used for uploading DSP binary code */
+struct dsp56k_upload {
+	int len;
+	char *bin;
+};
+
+/* For the DSP host flags */
+struct dsp56k_host_flags {
+	int dir;     /* Bit field. 1 = write output bit, 0 = do nothing.
+		      * 0x0000 means reading only, 0x0011 means
+		      * writing the bits stored in `out' on HF0 and HF1.
+		      * Note that HF2 and HF3 can only be read.
+		      */
+	int out;     /* Bit field like above. */
+	int status;  /* Host register's current state is returned */
+};
+
+/* ioctl command codes */
+#define DSP56K_UPLOAD	        1    /* Upload DSP binary program       */
+#define DSP56K_SET_TX_WSIZE	2    /* Host transmit word size (1-4)   */
+#define DSP56K_SET_RX_WSIZE	3    /* Host receive word size (1-4)    */
+#define DSP56K_HOST_FLAGS	4    /* Host flag registers             */
+#define DSP56K_HOST_CMD         5    /* Trig Host Command (0-31)        */
--- linux-2.1.26/drivers/char/misc.c.orig	Mon Feb 10 12:29:25 1997
+++ linux-2.1.26/drivers/char/misc.c	Fri Feb 14 21:57:19 1997
@@ -72,6 +72,7 @@
 extern void wdt_init(void);
 extern void pcwatchdog_init(void);
 extern int rtc_init(void);
+extern int dsp56k_init(void);
 
 #ifdef CONFIG_PROC_FS
 static int proc_misc_read(char *buf, char **start, off_t offset, int len, int unused)
@@ -238,6 +239,9 @@
 #endif
 #ifdef CONFIG_RTC
 	rtc_init();
+#endif
+#ifdef CONFIG_ATARI_DSP56K
+	dsp56k_init();
 #endif
 #endif /* !MODULE */
 	if (register_chrdev(MISC_MAJOR,"misc",&misc_fops)) {
--- linux-2.1.26/arch/m68k/config.in.orig	Fri Feb 14 16:02:53 1997
+++ linux-2.1.26/arch/m68k/config.in	Fri Feb 14 21:57:20 1997
@@ -213,6 +213,9 @@
   tristate 'Atari MFP serial support' CONFIG_ATARI_MFPSER
   tristate 'Atari SCC serial support' CONFIG_ATARI_SCC
   tristate 'Atari MIDI serial support' CONFIG_ATARI_MIDI
+  if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
+    tristate 'Atari DSP56k support (EXPERIMENTAL)' CONFIG_ATARI_DSP56K
+  fi
 fi
 if [ "$CONFIG_AMIGA" = "y" ]; then
   tristate 'Amiga builtin serial support' CONFIG_AMIGA_BUILTIN_SERIAL
--- linux-2.1.26/arch/m68k/atari/config.c.orig	Wed Feb 12 15:50:23 1997
+++ linux-2.1.26/arch/m68k/atari/config.c	Fri Feb 14 22:08:24 1997
@@ -347,10 +347,14 @@
 	ATARIHW_SET(PCM_8BIT);
         printk( "PCM " );
     }
-    if (hwreg_present( (void *)(0xffff8940) )) {
+    if (hwreg_present( &codec.unused5 )) {
 	ATARIHW_SET(CODEC);
         printk( "CODEC " );
     }
+    if (hwreg_present( &dsp56k_host_interface.icr )) {
+	ATARIHW_SET(DSP56K);
+        printk( "DSP56K " );
+    }
     if (hwreg_present( &tt_scc_dma.dma_ctrl ) &&
 #if 0
 	/* This test sucks! Who knows some better? */
@@ -1234,6 +1238,7 @@
     ATARIHW_ANNOUNCE(SCU, "System Control Unit");
     ATARIHW_ANNOUNCE(BLITTER, "Blitter");
     ATARIHW_ANNOUNCE(VME, "VME Bus");
+    ATARIHW_ANNOUNCE(DSP56K, "DSP56001 processor");
 
     return(len);
 }
--- linux-2.1.26/Documentation/Configure.help.orig	Wed Feb 12 15:50:06 1997
+++ linux-2.1.26/Documentation/Configure.help	Fri Feb 14 21:57:53 1997
@@ -4894,6 +4894,16 @@
   want). If you want to compile it as a module, say M here and read
   Documentation/modules.txt.
 
+Atari DSP56k Digital Signal Processor support
+CONFIG_ATARI_DSP56K
+  If you want to be able to use the DSP56001 in Falcons, say Y.
+  This driver is still experimental, and if you don't know what it is,
+  or if you don't have this processor, just say N.
+  This driver is also available as a module ( = code which can be inserted
+  in and removed from the running kernel whenever you want). If you
+  want to compile it as a module, say M here and read
+  Documentation/modules.txt.
+
 Amiga builtin serial support
 CONFIG_AMIGA_BUILTIN_SERIAL
   If you want to use your Amiga's built-in serial port in Linux, say
--- linux-2.1.26/drivers/char/Makefile.orig	Tue Jan 21 20:23:04 1997
+++ linux-2.1.26/drivers/char/Makefile	Fri Feb 14 22:13:35 1997
@@ -75,6 +75,16 @@
   endif
 endif
 
+ifeq ($(CONFIG_ATARI_DSP56K),y)
+L_OBJS += dsp56k.o
+S = y
+else
+  ifeq ($(CONFIG_ATARI_DSP56K),m)
+  M_OBJS += dsp56k.o
+  SM = y
+  endif
+endif
+
 ifeq ($(CONFIG_AMIGA_BUILTIN_SERIAL),y)
 L_OBJS += amiga_ser.o
 S = y
--- linux-2.1.26/include/asm-m68k/atarihw.h.orig	Tue Jan 21 20:23:29 1997
+++ linux-2.1.26/include/asm-m68k/atarihw.h	Fri Feb 14 21:58:04 1997
@@ -79,6 +79,7 @@
     ATARIHW_DECLARE(SCU);		/* System Control Unit */
     ATARIHW_DECLARE(BLITTER);		/* Blitter */
     ATARIHW_DECLARE(VME);		/* VME Bus */
+    ATARIHW_DECLARE(DSP56K);		/* DSP56k processor in Falcon */
 };
 
 extern struct atari_hw_present atari_hw_present;
--- linux-2.1.26/include/linux/major.h.orig	Sun Dec 29 15:05:48 1996
+++ linux-2.1.26/include/linux/major.h	Fri Feb 14 21:58:05 1997
@@ -70,6 +70,7 @@
 #define RISCOM8_NORMAL_MAJOR 48
 #define RISCOM8_CALLOUT_MAJOR 49
 #define MKISS_MAJOR	55
+#define DSP56K_MAJOR    55   /* DSP56001 processor device */
 
 /*
  * Tests for SCSI devices.