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path: root/drivers/char/dsp56k.c
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Diffstat (limited to 'drivers/char/dsp56k.c')
-rw-r--r--drivers/char/dsp56k.c547
1 files changed, 547 insertions, 0 deletions
diff --git a/drivers/char/dsp56k.c b/drivers/char/dsp56k.c
new file mode 100644
index 000000000000..37d6649011ad
--- /dev/null
+++ b/drivers/char/dsp56k.c
@@ -0,0 +1,547 @@
+/*
+ * The DSP56001 Device Driver, saviour of the Free World(tm)
+ *
+ * Authors: Fredrik Noring <noring@nocrew.org>
+ * lars brinkhoff <lars@nocrew.org>
+ * Tomas Berndtsson <tomas@nocrew.org>
+ *
+ * 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/module.h>
+#include <linux/slab.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 <linux/init.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/smp_lock.h>
+#include <linux/device.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 handshake(count, maxio, timeout, ENABLE, f) \
+{ \
+ long i, t, m; \
+ while (count > 0) { \
+ m = min_t(unsigned long, count, maxio); \
+ for (i = 0; i < m; i++) { \
+ for (t = 0; t < timeout && !ENABLE; t++) \
+ msleep(20); \
+ if(!ENABLE) \
+ return -EIO; \
+ f; \
+ } \
+ count -= m; \
+ if (m == maxio) msleep(20); \
+ } \
+}
+
+#define tx_wait(n) \
+{ \
+ int t; \
+ for(t = 0; t < n && !DSP56K_TRANSMIT; t++) \
+ msleep(10); \
+ if(!DSP56K_TRANSMIT) { \
+ return -EIO; \
+ } \
+}
+
+#define rx_wait(n) \
+{ \
+ int t; \
+ for(t = 0; t < n && !DSP56K_RECEIVE; t++) \
+ msleep(10); \
+ 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 {
+ long in_use;
+ long maxio, timeout;
+ int tx_wsize, rx_wsize;
+} dsp56k;
+
+static struct class_simple *dsp56k_class;
+
+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 ssize_t dsp56k_read(struct file *file, char *buf, size_t count,
+ loff_t *ppos)
+{
+ struct inode *inode = file->f_dentry->d_inode;
+ int dev = iminor(inode) & 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(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev);
+ return -ENXIO;
+ }
+}
+
+static ssize_t dsp56k_write(struct file *file, const char *buf, size_t count,
+ loff_t *ppos)
+{
+ struct inode *inode = file->f_dentry->d_inode;
+ int dev = iminor(inode) & 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 */
+ {
+ const short *data;
+
+ count /= 2;
+ data = (const 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 */
+ {
+ const long *data;
+
+ count /= 4;
+ data = (const 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(KERN_ERR "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 = iminor(inode) & 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;
+
+ return put_user(status, &hf->status);
+ }
+ 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(KERN_ERR "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???
+ */
+#if 0
+static unsigned int dsp56k_poll(struct file *file, poll_table *wait)
+{
+ int dev = iminor(file->f_dentry->d_inode) & 0x0f;
+
+ switch(dev)
+ {
+ case DSP56K_DEV_56001:
+ /* poll_wait(file, ???, wait); */
+ return POLLIN | POLLRDNORM | POLLOUT;
+
+ default:
+ printk("DSP56k driver: Unknown minor device: %d\n", dev);
+ return 0;
+ }
+}
+#endif
+
+static int dsp56k_open(struct inode *inode, struct file *file)
+{
+ int dev = iminor(inode) & 0x0f;
+
+ switch(dev)
+ {
+ case DSP56K_DEV_56001:
+
+ if (test_and_set_bit(0, &dsp56k.in_use))
+ return -EBUSY;
+
+ 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:
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static int dsp56k_release(struct inode *inode, struct file *file)
+{
+ int dev = iminor(inode) & 0x0f;
+
+ switch(dev)
+ {
+ case DSP56K_DEV_56001:
+ clear_bit(0, &dsp56k.in_use);
+ break;
+ default:
+ printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev);
+ return -ENXIO;
+ }
+
+ return 0;
+}
+
+static struct file_operations dsp56k_fops = {
+ .owner = THIS_MODULE,
+ .read = dsp56k_read,
+ .write = dsp56k_write,
+ .ioctl = dsp56k_ioctl,
+ .open = dsp56k_open,
+ .release = dsp56k_release,
+};
+
+
+/****** Init and module functions ******/
+
+static char banner[] __initdata = KERN_INFO "DSP56k driver installed\n";
+
+static int __init dsp56k_init_driver(void)
+{
+ int err = 0;
+
+ if(!MACH_IS_ATARI || !ATARIHW_PRESENT(DSP56K)) {
+ printk("DSP56k driver: Hardware not present\n");
+ return -ENODEV;
+ }
+
+ if(register_chrdev(DSP56K_MAJOR, "dsp56k", &dsp56k_fops)) {
+ printk("DSP56k driver: Unable to register driver\n");
+ return -ENODEV;
+ }
+ dsp56k_class = class_simple_create(THIS_MODULE, "dsp56k");
+ if (IS_ERR(dsp56k_class)) {
+ err = PTR_ERR(dsp56k_class);
+ goto out_chrdev;
+ }
+ class_simple_device_add(dsp56k_class, MKDEV(DSP56K_MAJOR, 0), NULL, "dsp56k");
+
+ err = devfs_mk_cdev(MKDEV(DSP56K_MAJOR, 0),
+ S_IFCHR | S_IRUSR | S_IWUSR, "dsp56k");
+ if(err)
+ goto out_class;
+
+ printk(banner);
+ goto out;
+
+out_class:
+ class_simple_device_remove(MKDEV(DSP56K_MAJOR, 0));
+ class_simple_destroy(dsp56k_class);
+out_chrdev:
+ unregister_chrdev(DSP56K_MAJOR, "dsp56k");
+out:
+ return err;
+}
+module_init(dsp56k_init_driver);
+
+static void __exit dsp56k_cleanup_driver(void)
+{
+ class_simple_device_remove(MKDEV(DSP56K_MAJOR, 0));
+ class_simple_destroy(dsp56k_class);
+ unregister_chrdev(DSP56K_MAJOR, "dsp56k");
+ devfs_remove("dsp56k");
+}
+module_exit(dsp56k_cleanup_driver);
+
+MODULE_LICENSE("GPL");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.