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-rw-r--r--drivers/char/dsp56k.c534
1 files changed, 534 insertions, 0 deletions
diff --git a/drivers/char/dsp56k.c b/drivers/char/dsp56k.c
new file mode 100644
index 0000000000..bda27e595d
--- /dev/null
+++ b/drivers/char/dsp56k.c
@@ -0,0 +1,534 @@
+/*
+ * 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/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/device.h>
+#include <linux/mutex.h>
+#include <linux/firmware.h>
+#include <linux/platform_device.h>
+#include <linux/uaccess.h> /* For put_user and get_user */
+
+#include <asm/atarihw.h>
+#include <asm/traps.h>
+
+#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; \
+ } \
+}
+
+static DEFINE_MUTEX(dsp56k_mutex);
+static struct dsp56k_device {
+ unsigned long in_use;
+ long maxio, timeout;
+ int tx_wsize, rx_wsize;
+} dsp56k;
+
+static const struct class dsp56k_class = {
+ .name = "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 __user *bin, int len)
+{
+ struct platform_device *pdev;
+ const struct firmware *fw;
+ const char fw_name[] = "dsp56k/bootstrap.bin";
+ int err;
+ int i;
+
+ dsp56k_reset();
+
+ pdev = platform_device_register_simple("dsp56k", 0, NULL, 0);
+ if (IS_ERR(pdev)) {
+ printk(KERN_ERR "Failed to register device for \"%s\"\n",
+ fw_name);
+ return -EINVAL;
+ }
+ err = request_firmware(&fw, fw_name, &pdev->dev);
+ platform_device_unregister(pdev);
+ if (err) {
+ printk(KERN_ERR "Failed to load image \"%s\" err %d\n",
+ fw_name, err);
+ return err;
+ }
+ if (fw->size % 3) {
+ printk(KERN_ERR "Bogus length %d in image \"%s\"\n",
+ fw->size, fw_name);
+ release_firmware(fw);
+ return -EINVAL;
+ }
+ for (i = 0; i < fw->size; i = i + 3) {
+ /* tx_wait(10); */
+ dsp56k_host_interface.data.b[1] = fw->data[i];
+ dsp56k_host_interface.data.b[2] = fw->data[i + 1];
+ dsp56k_host_interface.data.b[3] = fw->data[i + 2];
+ }
+ release_firmware(fw);
+ 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 __user *buf, size_t count,
+ loff_t *ppos)
+{
+ struct inode *inode = file_inode(file);
+ 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 __user *data;
+
+ count /= 2;
+ data = (short __user *) 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 __user *data;
+
+ count /= 4;
+ data = (long __user *) 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 __user *buf, size_t count,
+ loff_t *ppos)
+{
+ struct inode *inode = file_inode(file);
+ 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 __user *data;
+
+ count /= 2;
+ data = (const short __user *)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 __user *data;
+
+ count /= 4;
+ data = (const long __user *)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 long dsp56k_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ int dev = iminor(file_inode(file)) & 0x0f;
+ void __user *argp = (void __user *)arg;
+
+ switch(dev)
+ {
+ case DSP56K_DEV_56001:
+
+ switch(cmd) {
+ case DSP56K_UPLOAD:
+ {
+ char __user *bin;
+ int r, len;
+ struct dsp56k_upload __user *binary = argp;
+
+ 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;
+ }
+ mutex_lock(&dsp56k_mutex);
+ r = dsp56k_upload(bin, len);
+ mutex_unlock(&dsp56k_mutex);
+ if (r < 0) {
+ return r;
+ }
+
+ break;
+ }
+ case DSP56K_SET_TX_WSIZE:
+ if (arg > 4 || arg < 1)
+ return -EINVAL;
+ mutex_lock(&dsp56k_mutex);
+ dsp56k.tx_wsize = (int) arg;
+ mutex_unlock(&dsp56k_mutex);
+ break;
+ case DSP56K_SET_RX_WSIZE:
+ if (arg > 4 || arg < 1)
+ return -EINVAL;
+ mutex_lock(&dsp56k_mutex);
+ dsp56k.rx_wsize = (int) arg;
+ mutex_unlock(&dsp56k_mutex);
+ break;
+ case DSP56K_HOST_FLAGS:
+ {
+ int dir, out, status;
+ struct dsp56k_host_flags __user *hf = argp;
+
+ if(get_user(dir, &hf->dir) < 0)
+ return -EFAULT;
+ if(get_user(out, &hf->out) < 0)
+ return -EFAULT;
+
+ mutex_lock(&dsp56k_mutex);
+ 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;
+ mutex_unlock(&dsp56k_mutex);
+ return put_user(status, &hf->status);
+ }
+ case DSP56K_HOST_CMD:
+ if (arg > 31)
+ return -EINVAL;
+ mutex_lock(&dsp56k_mutex);
+ dsp56k_host_interface.cvr = (u_char)((arg & DSP56K_CVR_HV_MASK) |
+ DSP56K_CVR_HC);
+ mutex_unlock(&dsp56k_mutex);
+ 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 __poll_t dsp56k_poll(struct file *file, poll_table *wait)
+{
+ int dev = iminor(file_inode(file)) & 0x0f;
+
+ switch(dev)
+ {
+ case DSP56K_DEV_56001:
+ /* poll_wait(file, ???, wait); */
+ return EPOLLIN | EPOLLRDNORM | EPOLLOUT;
+
+ 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;
+ int ret = 0;
+
+ mutex_lock(&dsp56k_mutex);
+ switch(dev)
+ {
+ case DSP56K_DEV_56001:
+
+ if (test_and_set_bit(0, &dsp56k.in_use)) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ 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:
+ ret = -ENODEV;
+ }
+out:
+ mutex_unlock(&dsp56k_mutex);
+ return ret;
+}
+
+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 const struct file_operations dsp56k_fops = {
+ .owner = THIS_MODULE,
+ .read = dsp56k_read,
+ .write = dsp56k_write,
+ .unlocked_ioctl = dsp56k_ioctl,
+ .open = dsp56k_open,
+ .release = dsp56k_release,
+ .llseek = noop_llseek,
+};
+
+
+/****** Init and module functions ******/
+
+static const char banner[] __initconst = KERN_INFO "DSP56k driver installed\n";
+
+static int __init dsp56k_init_driver(void)
+{
+ int err;
+
+ 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;
+ }
+ err = class_register(&dsp56k_class);
+ if (err)
+ goto out_chrdev;
+ device_create(&dsp56k_class, NULL, MKDEV(DSP56K_MAJOR, 0), NULL,
+ "dsp56k");
+
+ printk(banner);
+ goto out;
+
+out_chrdev:
+ unregister_chrdev(DSP56K_MAJOR, "dsp56k");
+out:
+ return err;
+}
+module_init(dsp56k_init_driver);
+
+static void __exit dsp56k_cleanup_driver(void)
+{
+ device_destroy(&dsp56k_class, MKDEV(DSP56K_MAJOR, 0));
+ class_unregister(&dsp56k_class);
+ unregister_chrdev(DSP56K_MAJOR, "dsp56k");
+}
+module_exit(dsp56k_cleanup_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_FIRMWARE("dsp56k/bootstrap.bin");
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