535 lines
12 KiB
C
535 lines
12 KiB
C
/*
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* The DSP56001 Device Driver, saviour of the Free World(tm)
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*
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* Authors: Fredrik Noring <noring@nocrew.org>
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* lars brinkhoff <lars@nocrew.org>
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* Tomas Berndtsson <tomas@nocrew.org>
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*
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* First version May 1996
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*
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* History:
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* 97-01-29 Tomas Berndtsson,
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* Integrated with Linux 2.1.21 kernel sources.
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* 97-02-15 Tomas Berndtsson,
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* Fixed for kernel 2.1.26
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*
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* BUGS:
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* Hmm... there must be something here :)
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*
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* Copyright (C) 1996,1997 Fredrik Noring, lars brinkhoff & Tomas Berndtsson
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#include <linux/module.h>
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#include <linux/major.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/delay.h> /* guess what */
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/mutex.h>
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#include <linux/firmware.h>
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#include <linux/platform_device.h>
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#include <linux/uaccess.h> /* For put_user and get_user */
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#include <asm/atarihw.h>
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#include <asm/traps.h>
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#include <asm/dsp56k.h>
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/* minor devices */
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#define DSP56K_DEV_56001 0 /* The only device so far */
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#define TIMEOUT 10 /* Host port timeout in number of tries */
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#define MAXIO 2048 /* Maximum number of words before sleep */
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#define DSP56K_MAX_BINARY_LENGTH (3*64*1024)
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#define DSP56K_TX_INT_ON dsp56k_host_interface.icr |= DSP56K_ICR_TREQ
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#define DSP56K_RX_INT_ON dsp56k_host_interface.icr |= DSP56K_ICR_RREQ
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#define DSP56K_TX_INT_OFF dsp56k_host_interface.icr &= ~DSP56K_ICR_TREQ
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#define DSP56K_RX_INT_OFF dsp56k_host_interface.icr &= ~DSP56K_ICR_RREQ
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#define DSP56K_TRANSMIT (dsp56k_host_interface.isr & DSP56K_ISR_TXDE)
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#define DSP56K_RECEIVE (dsp56k_host_interface.isr & DSP56K_ISR_RXDF)
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#define handshake(count, maxio, timeout, ENABLE, f) \
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{ \
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long i, t, m; \
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while (count > 0) { \
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m = min_t(unsigned long, count, maxio); \
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for (i = 0; i < m; i++) { \
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for (t = 0; t < timeout && !ENABLE; t++) \
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msleep(20); \
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if(!ENABLE) \
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return -EIO; \
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f; \
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} \
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count -= m; \
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if (m == maxio) msleep(20); \
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} \
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}
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#define tx_wait(n) \
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{ \
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int t; \
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for(t = 0; t < n && !DSP56K_TRANSMIT; t++) \
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msleep(10); \
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if(!DSP56K_TRANSMIT) { \
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return -EIO; \
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} \
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}
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#define rx_wait(n) \
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{ \
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int t; \
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for(t = 0; t < n && !DSP56K_RECEIVE; t++) \
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msleep(10); \
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if(!DSP56K_RECEIVE) { \
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return -EIO; \
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} \
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}
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static DEFINE_MUTEX(dsp56k_mutex);
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static struct dsp56k_device {
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unsigned long in_use;
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long maxio, timeout;
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int tx_wsize, rx_wsize;
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} dsp56k;
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static struct class *dsp56k_class;
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static int dsp56k_reset(void)
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{
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u_char status;
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/* Power down the DSP */
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sound_ym.rd_data_reg_sel = 14;
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status = sound_ym.rd_data_reg_sel & 0xef;
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sound_ym.wd_data = status;
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sound_ym.wd_data = status | 0x10;
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udelay(10);
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/* Power up the DSP */
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sound_ym.rd_data_reg_sel = 14;
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sound_ym.wd_data = sound_ym.rd_data_reg_sel & 0xef;
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return 0;
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}
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static int dsp56k_upload(u_char __user *bin, int len)
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{
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struct platform_device *pdev;
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const struct firmware *fw;
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const char fw_name[] = "dsp56k/bootstrap.bin";
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int err;
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int i;
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dsp56k_reset();
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pdev = platform_device_register_simple("dsp56k", 0, NULL, 0);
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if (IS_ERR(pdev)) {
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printk(KERN_ERR "Failed to register device for \"%s\"\n",
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fw_name);
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return -EINVAL;
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}
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err = request_firmware(&fw, fw_name, &pdev->dev);
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platform_device_unregister(pdev);
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if (err) {
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printk(KERN_ERR "Failed to load image \"%s\" err %d\n",
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fw_name, err);
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return err;
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}
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if (fw->size % 3) {
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printk(KERN_ERR "Bogus length %d in image \"%s\"\n",
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fw->size, fw_name);
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release_firmware(fw);
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return -EINVAL;
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}
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for (i = 0; i < fw->size; i = i + 3) {
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/* tx_wait(10); */
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dsp56k_host_interface.data.b[1] = fw->data[i];
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dsp56k_host_interface.data.b[2] = fw->data[i + 1];
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dsp56k_host_interface.data.b[3] = fw->data[i + 2];
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}
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release_firmware(fw);
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for (; i < 512; i++) {
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/* tx_wait(10); */
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dsp56k_host_interface.data.b[1] = 0;
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dsp56k_host_interface.data.b[2] = 0;
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dsp56k_host_interface.data.b[3] = 0;
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}
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for (i = 0; i < len; i++) {
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tx_wait(10);
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get_user(dsp56k_host_interface.data.b[1], bin++);
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get_user(dsp56k_host_interface.data.b[2], bin++);
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get_user(dsp56k_host_interface.data.b[3], bin++);
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}
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tx_wait(10);
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dsp56k_host_interface.data.l = 3; /* Magic execute */
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return 0;
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}
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static ssize_t dsp56k_read(struct file *file, char __user *buf, size_t count,
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loff_t *ppos)
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{
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struct inode *inode = file_inode(file);
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int dev = iminor(inode) & 0x0f;
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switch(dev)
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{
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case DSP56K_DEV_56001:
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{
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long n;
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/* Don't do anything if nothing is to be done */
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if (!count) return 0;
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n = 0;
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switch (dsp56k.rx_wsize) {
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case 1: /* 8 bit */
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{
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handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
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put_user(dsp56k_host_interface.data.b[3], buf+n++));
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return n;
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}
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case 2: /* 16 bit */
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{
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short __user *data;
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count /= 2;
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data = (short __user *) buf;
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handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
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put_user(dsp56k_host_interface.data.w[1], data+n++));
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return 2*n;
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}
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case 3: /* 24 bit */
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{
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count /= 3;
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handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
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put_user(dsp56k_host_interface.data.b[1], buf+n++);
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put_user(dsp56k_host_interface.data.b[2], buf+n++);
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put_user(dsp56k_host_interface.data.b[3], buf+n++));
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return 3*n;
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}
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case 4: /* 32 bit */
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{
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long __user *data;
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count /= 4;
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data = (long __user *) buf;
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handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
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put_user(dsp56k_host_interface.data.l, data+n++));
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return 4*n;
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}
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}
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return -EFAULT;
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}
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default:
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printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev);
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return -ENXIO;
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}
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}
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static ssize_t dsp56k_write(struct file *file, const char __user *buf, size_t count,
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loff_t *ppos)
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{
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struct inode *inode = file_inode(file);
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int dev = iminor(inode) & 0x0f;
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switch(dev)
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{
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case DSP56K_DEV_56001:
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{
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long n;
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/* Don't do anything if nothing is to be done */
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if (!count) return 0;
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n = 0;
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switch (dsp56k.tx_wsize) {
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case 1: /* 8 bit */
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{
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handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
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get_user(dsp56k_host_interface.data.b[3], buf+n++));
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return n;
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}
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case 2: /* 16 bit */
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{
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const short __user *data;
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count /= 2;
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data = (const short __user *)buf;
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handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
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get_user(dsp56k_host_interface.data.w[1], data+n++));
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return 2*n;
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}
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case 3: /* 24 bit */
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{
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count /= 3;
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handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
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get_user(dsp56k_host_interface.data.b[1], buf+n++);
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get_user(dsp56k_host_interface.data.b[2], buf+n++);
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get_user(dsp56k_host_interface.data.b[3], buf+n++));
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return 3*n;
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}
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case 4: /* 32 bit */
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{
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const long __user *data;
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count /= 4;
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data = (const long __user *)buf;
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handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
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get_user(dsp56k_host_interface.data.l, data+n++));
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return 4*n;
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}
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}
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return -EFAULT;
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}
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default:
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printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev);
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return -ENXIO;
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}
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}
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static long dsp56k_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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int dev = iminor(file_inode(file)) & 0x0f;
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void __user *argp = (void __user *)arg;
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switch(dev)
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{
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case DSP56K_DEV_56001:
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switch(cmd) {
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case DSP56K_UPLOAD:
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{
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char __user *bin;
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int r, len;
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struct dsp56k_upload __user *binary = argp;
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if(get_user(len, &binary->len) < 0)
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return -EFAULT;
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if(get_user(bin, &binary->bin) < 0)
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return -EFAULT;
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if (len <= 0) {
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return -EINVAL; /* nothing to upload?!? */
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}
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if (len > DSP56K_MAX_BINARY_LENGTH) {
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return -EINVAL;
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}
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mutex_lock(&dsp56k_mutex);
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r = dsp56k_upload(bin, len);
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mutex_unlock(&dsp56k_mutex);
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if (r < 0) {
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return r;
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}
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break;
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}
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case DSP56K_SET_TX_WSIZE:
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if (arg > 4 || arg < 1)
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return -EINVAL;
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mutex_lock(&dsp56k_mutex);
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dsp56k.tx_wsize = (int) arg;
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mutex_unlock(&dsp56k_mutex);
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break;
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case DSP56K_SET_RX_WSIZE:
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if (arg > 4 || arg < 1)
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return -EINVAL;
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mutex_lock(&dsp56k_mutex);
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dsp56k.rx_wsize = (int) arg;
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mutex_unlock(&dsp56k_mutex);
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break;
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case DSP56K_HOST_FLAGS:
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{
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int dir, out, status;
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struct dsp56k_host_flags __user *hf = argp;
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if(get_user(dir, &hf->dir) < 0)
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return -EFAULT;
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if(get_user(out, &hf->out) < 0)
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return -EFAULT;
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mutex_lock(&dsp56k_mutex);
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if ((dir & 0x1) && (out & 0x1))
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dsp56k_host_interface.icr |= DSP56K_ICR_HF0;
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else if (dir & 0x1)
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dsp56k_host_interface.icr &= ~DSP56K_ICR_HF0;
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if ((dir & 0x2) && (out & 0x2))
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dsp56k_host_interface.icr |= DSP56K_ICR_HF1;
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else if (dir & 0x2)
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dsp56k_host_interface.icr &= ~DSP56K_ICR_HF1;
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status = 0;
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if (dsp56k_host_interface.icr & DSP56K_ICR_HF0) status |= 0x1;
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if (dsp56k_host_interface.icr & DSP56K_ICR_HF1) status |= 0x2;
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if (dsp56k_host_interface.isr & DSP56K_ISR_HF2) status |= 0x4;
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if (dsp56k_host_interface.isr & DSP56K_ISR_HF3) status |= 0x8;
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mutex_unlock(&dsp56k_mutex);
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return put_user(status, &hf->status);
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}
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case DSP56K_HOST_CMD:
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if (arg > 31)
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return -EINVAL;
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mutex_lock(&dsp56k_mutex);
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dsp56k_host_interface.cvr = (u_char)((arg & DSP56K_CVR_HV_MASK) |
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DSP56K_CVR_HC);
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mutex_unlock(&dsp56k_mutex);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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default:
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printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev);
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return -ENXIO;
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}
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}
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/* As of 2.1.26 this should be dsp56k_poll,
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* but how do I then check device minor number?
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* Do I need this function at all???
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*/
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#if 0
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static __poll_t dsp56k_poll(struct file *file, poll_table *wait)
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{
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int dev = iminor(file_inode(file)) & 0x0f;
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switch(dev)
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{
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case DSP56K_DEV_56001:
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/* poll_wait(file, ???, wait); */
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return EPOLLIN | EPOLLRDNORM | EPOLLOUT;
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default:
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printk("DSP56k driver: Unknown minor device: %d\n", dev);
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return 0;
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}
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}
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#endif
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static int dsp56k_open(struct inode *inode, struct file *file)
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{
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int dev = iminor(inode) & 0x0f;
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int ret = 0;
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mutex_lock(&dsp56k_mutex);
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switch(dev)
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{
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case DSP56K_DEV_56001:
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if (test_and_set_bit(0, &dsp56k.in_use)) {
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ret = -EBUSY;
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goto out;
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}
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dsp56k.timeout = TIMEOUT;
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dsp56k.maxio = MAXIO;
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dsp56k.rx_wsize = dsp56k.tx_wsize = 4;
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DSP56K_TX_INT_OFF;
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DSP56K_RX_INT_OFF;
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/* Zero host flags */
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dsp56k_host_interface.icr &= ~DSP56K_ICR_HF0;
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dsp56k_host_interface.icr &= ~DSP56K_ICR_HF1;
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break;
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default:
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ret = -ENODEV;
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}
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out:
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mutex_unlock(&dsp56k_mutex);
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return ret;
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}
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static int dsp56k_release(struct inode *inode, struct file *file)
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{
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int dev = iminor(inode) & 0x0f;
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switch(dev)
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{
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case DSP56K_DEV_56001:
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clear_bit(0, &dsp56k.in_use);
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break;
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default:
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printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev);
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return -ENXIO;
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}
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return 0;
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}
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static const struct file_operations dsp56k_fops = {
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.owner = THIS_MODULE,
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.read = dsp56k_read,
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.write = dsp56k_write,
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.unlocked_ioctl = dsp56k_ioctl,
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.open = dsp56k_open,
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.release = dsp56k_release,
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.llseek = noop_llseek,
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};
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/****** Init and module functions ******/
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static const char banner[] __initconst = KERN_INFO "DSP56k driver installed\n";
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static int __init dsp56k_init_driver(void)
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{
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int err = 0;
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if(!MACH_IS_ATARI || !ATARIHW_PRESENT(DSP56K)) {
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printk("DSP56k driver: Hardware not present\n");
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return -ENODEV;
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}
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if(register_chrdev(DSP56K_MAJOR, "dsp56k", &dsp56k_fops)) {
|
|
printk("DSP56k driver: Unable to register driver\n");
|
|
return -ENODEV;
|
|
}
|
|
dsp56k_class = class_create(THIS_MODULE, "dsp56k");
|
|
if (IS_ERR(dsp56k_class)) {
|
|
err = PTR_ERR(dsp56k_class);
|
|
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_destroy(dsp56k_class);
|
|
unregister_chrdev(DSP56K_MAJOR, "dsp56k");
|
|
}
|
|
module_exit(dsp56k_cleanup_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_FIRMWARE("dsp56k/bootstrap.bin");
|