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linux-stable-rt/arch/blackfin/mach-bf561/coreb.c

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/*
* File: arch/blackfin/mach-bf561/coreb.c
* Based on:
* Author:
*
* Created:
* Description: Handle CoreB on a BF561
*
* Modified:
* Copyright 2004-2006 Analog Devices Inc.
*
* Bugs: Enter bugs at http://blackfin.uclinux.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, see the file COPYING, or write
* to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/mm.h>
#include <linux/miscdevice.h>
#include <linux/device.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include <asm/dma.h>
#define MODULE_VER "v0.1"
static spinlock_t coreb_lock;
static wait_queue_head_t coreb_dma_wait;
#define COREB_IS_OPEN 0x00000001
#define COREB_IS_RUNNING 0x00000010
#define CMD_COREB_INDEX 1
#define CMD_COREB_START 2
#define CMD_COREB_STOP 3
#define CMD_COREB_RESET 4
#define COREB_MINOR 229
static unsigned long coreb_status = 0;
static unsigned long coreb_base = 0xff600000;
static unsigned long coreb_size = 0x4000;
int coreb_dma_done;
static loff_t coreb_lseek(struct file *file, loff_t offset, int origin);
static ssize_t coreb_read(struct file *file, char *buf, size_t count,
loff_t * ppos);
static ssize_t coreb_write(struct file *file, const char *buf, size_t count,
loff_t * ppos);
static int coreb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
unsigned long arg);
static int coreb_open(struct inode *inode, struct file *file);
static int coreb_release(struct inode *inode, struct file *file);
static irqreturn_t coreb_dma_interrupt(int irq, void *dev_id)
{
clear_dma_irqstat(CH_MEM_STREAM2_DEST);
coreb_dma_done = 1;
wake_up_interruptible(&coreb_dma_wait);
return IRQ_HANDLED;
}
static ssize_t coreb_write(struct file *file, const char *buf, size_t count,
loff_t * ppos)
{
unsigned long p = *ppos;
ssize_t wrote = 0;
if (p + count > coreb_size)
return -EFAULT;
while (count > 0) {
int len = count;
if (len > PAGE_SIZE)
len = PAGE_SIZE;
coreb_dma_done = 0;
/* Source Channel */
set_dma_start_addr(CH_MEM_STREAM2_SRC, (unsigned long)buf);
set_dma_x_count(CH_MEM_STREAM2_SRC, len);
set_dma_x_modify(CH_MEM_STREAM2_SRC, sizeof(char));
set_dma_config(CH_MEM_STREAM2_SRC, RESTART);
/* Destination Channel */
set_dma_start_addr(CH_MEM_STREAM2_DEST, coreb_base + p);
set_dma_x_count(CH_MEM_STREAM2_DEST, len);
set_dma_x_modify(CH_MEM_STREAM2_DEST, sizeof(char));
set_dma_config(CH_MEM_STREAM2_DEST, WNR | RESTART | DI_EN);
enable_dma(CH_MEM_STREAM2_SRC);
enable_dma(CH_MEM_STREAM2_DEST);
wait_event_interruptible(coreb_dma_wait, coreb_dma_done);
disable_dma(CH_MEM_STREAM2_SRC);
disable_dma(CH_MEM_STREAM2_DEST);
count -= len;
wrote += len;
buf += len;
p += len;
}
*ppos = p;
return wrote;
}
static ssize_t coreb_read(struct file *file, char *buf, size_t count,
loff_t * ppos)
{
unsigned long p = *ppos;
ssize_t read = 0;
if ((p + count) > coreb_size)
return -EFAULT;
while (count > 0) {
int len = count;
if (len > PAGE_SIZE)
len = PAGE_SIZE;
coreb_dma_done = 0;
/* Source Channel */
set_dma_start_addr(CH_MEM_STREAM2_SRC, coreb_base + p);
set_dma_x_count(CH_MEM_STREAM2_SRC, len);
set_dma_x_modify(CH_MEM_STREAM2_SRC, sizeof(char));
set_dma_config(CH_MEM_STREAM2_SRC, RESTART);
/* Destination Channel */
set_dma_start_addr(CH_MEM_STREAM2_DEST, (unsigned long)buf);
set_dma_x_count(CH_MEM_STREAM2_DEST, len);
set_dma_x_modify(CH_MEM_STREAM2_DEST, sizeof(char));
set_dma_config(CH_MEM_STREAM2_DEST, WNR | RESTART | DI_EN);
enable_dma(CH_MEM_STREAM2_SRC);
enable_dma(CH_MEM_STREAM2_DEST);
wait_event_interruptible(coreb_dma_wait, coreb_dma_done);
disable_dma(CH_MEM_STREAM2_SRC);
disable_dma(CH_MEM_STREAM2_DEST);
count -= len;
read += len;
buf += len;
p += len;
}
return read;
}
static loff_t coreb_lseek(struct file *file, loff_t offset, int origin)
{
loff_t ret;
mutex_lock(&file->f_dentry->d_inode->i_mutex);
switch (origin) {
case 0 /* SEEK_SET */ :
if (offset < coreb_size) {
file->f_pos = offset;
ret = file->f_pos;
} else
ret = -EINVAL;
break;
case 1 /* SEEK_CUR */ :
if ((offset + file->f_pos) < coreb_size) {
file->f_pos += offset;
ret = file->f_pos;
} else
ret = -EINVAL;
default:
ret = -EINVAL;
}
mutex_unlock(&file->f_dentry->d_inode->i_mutex);
return ret;
}
static int coreb_open(struct inode *inode, struct file *file)
{
spin_lock_irq(&coreb_lock);
if (coreb_status & COREB_IS_OPEN)
goto out_busy;
coreb_status |= COREB_IS_OPEN;
spin_unlock_irq(&coreb_lock);
return 0;
out_busy:
spin_unlock_irq(&coreb_lock);
return -EBUSY;
}
static int coreb_release(struct inode *inode, struct file *file)
{
spin_lock_irq(&coreb_lock);
coreb_status &= ~COREB_IS_OPEN;
spin_unlock_irq(&coreb_lock);
return 0;
}
static int coreb_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
int retval = 0;
int coreb_index = 0;
switch (cmd) {
case CMD_COREB_INDEX:
if (copy_from_user(&coreb_index, (int *)arg, sizeof(int))) {
retval = -EFAULT;
break;
}
spin_lock_irq(&coreb_lock);
switch (coreb_index) {
case 0:
coreb_base = 0xff600000;
coreb_size = 0x4000;
break;
case 1:
coreb_base = 0xff610000;
coreb_size = 0x4000;
break;
case 2:
coreb_base = 0xff500000;
coreb_size = 0x8000;
break;
case 3:
coreb_base = 0xff400000;
coreb_size = 0x8000;
break;
default:
retval = -EINVAL;
break;
}
spin_unlock_irq(&coreb_lock);
mutex_lock(&file->f_dentry->d_inode->i_mutex);
file->f_pos = 0;
mutex_unlock(&file->f_dentry->d_inode->i_mutex);
break;
case CMD_COREB_START:
spin_lock_irq(&coreb_lock);
if (coreb_status & COREB_IS_RUNNING) {
retval = -EBUSY;
break;
}
printk(KERN_INFO "Starting Core B\n");
coreb_status |= COREB_IS_RUNNING;
bfin_write_SICA_SYSCR(bfin_read_SICA_SYSCR() & ~0x0020);
SSYNC();
spin_lock_irq(&coreb_lock);
break;
#if defined(CONFIG_BF561_COREB_RESET)
case CMD_COREB_STOP:
spin_lock_irq(&coreb_lock);
printk(KERN_INFO "Stopping Core B\n");
bfin_write_SICA_SYSCR(bfin_read_SICA_SYSCR() | 0x0020);
bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | 0x0080);
coreb_status &= ~COREB_IS_RUNNING;
spin_lock_irq(&coreb_lock);
break;
case CMD_COREB_RESET:
printk(KERN_INFO "Resetting Core B\n");
bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | 0x0080);
break;
#endif
}
return retval;
}
static struct file_operations coreb_fops = {
.owner = THIS_MODULE,
.llseek = coreb_lseek,
.read = coreb_read,
.write = coreb_write,
.ioctl = coreb_ioctl,
.open = coreb_open,
.release = coreb_release
};
static struct miscdevice coreb_dev = {
COREB_MINOR,
"coreb",
&coreb_fops
};
static ssize_t coreb_show_status(struct device *dev, struct device_attribute *attr, char *buf)
{
return sprintf(buf,
"Base Address:\t0x%08lx\n"
"Core B is %s\n"
"SICA_SYSCR:\t%04x\n"
"SICB_SYSCR:\t%04x\n"
"\n"
"IRQ Status:\tCore A\t\tCore B\n"
"ISR0:\t\t%08x\t\t%08x\n"
"ISR1:\t\t%08x\t\t%08x\n"
"IMASK0:\t\t%08x\t\t%08x\n"
"IMASK1:\t\t%08x\t\t%08x\n",
coreb_base,
coreb_status & COREB_IS_RUNNING ? "running" : "stalled",
bfin_read_SICA_SYSCR(), bfin_read_SICB_SYSCR(),
bfin_read_SICA_ISR0(), bfin_read_SICB_ISR0(),
bfin_read_SICA_ISR1(), bfin_read_SICB_ISR0(),
bfin_read_SICA_IMASK0(), bfin_read_SICB_IMASK0(),
bfin_read_SICA_IMASK1(), bfin_read_SICB_IMASK1());
}
static DEVICE_ATTR(coreb_status, S_IRUGO, coreb_show_status, NULL);
int __init bf561_coreb_init(void)
{
init_waitqueue_head(&coreb_dma_wait);
spin_lock_init(&coreb_lock);
/* Request the core memory regions for Core B */
if (request_mem_region(0xff600000, 0x4000,
"Core B - Instruction SRAM") == NULL)
goto exit;
if (request_mem_region(0xFF610000, 0x4000,
"Core B - Instruction SRAM") == NULL)
goto release_instruction_a_sram;
if (request_mem_region(0xFF500000, 0x8000,
"Core B - Data Bank B SRAM") == NULL)
goto release_instruction_b_sram;
if (request_mem_region(0xff400000, 0x8000,
"Core B - Data Bank A SRAM") == NULL)
goto release_data_b_sram;
if (request_dma(CH_MEM_STREAM2_DEST, "Core B - DMA Destination") < 0)
goto release_data_a_sram;
if (request_dma(CH_MEM_STREAM2_SRC, "Core B - DMA Source") < 0)
goto release_dma_dest;
set_dma_callback(CH_MEM_STREAM2_DEST, coreb_dma_interrupt, NULL);
misc_register(&coreb_dev);
if (device_create_file(coreb_dev.this_device, &dev_attr_coreb_status))
goto release_dma_src;
printk(KERN_INFO "BF561 Core B driver %s initialized.\n", MODULE_VER);
return 0;
release_dma_src:
free_dma(CH_MEM_STREAM2_SRC);
release_dma_dest:
free_dma(CH_MEM_STREAM2_DEST);
release_data_a_sram:
release_mem_region(0xff400000, 0x8000);
release_data_b_sram:
release_mem_region(0xff500000, 0x8000);
release_instruction_b_sram:
release_mem_region(0xff610000, 0x4000);
release_instruction_a_sram:
release_mem_region(0xff600000, 0x4000);
exit:
return -ENOMEM;
}
void __exit bf561_coreb_exit(void)
{
device_remove_file(coreb_dev.this_device, &dev_attr_coreb_status);
misc_deregister(&coreb_dev);
release_mem_region(0xff610000, 0x4000);
release_mem_region(0xff600000, 0x4000);
release_mem_region(0xff500000, 0x8000);
release_mem_region(0xff400000, 0x8000);
free_dma(CH_MEM_STREAM2_DEST);
free_dma(CH_MEM_STREAM2_SRC);
}
module_init(bf561_coreb_init);
module_exit(bf561_coreb_exit);
MODULE_AUTHOR("Bas Vermeulen <bvermeul@blackstar.xs4all.nl>");
MODULE_DESCRIPTION("BF561 Core B Support");
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