-/*
- * File: arch/blackfin/mach-bf561/coreb.c
- * Based on:
- * Author:
+/* Load firmware into Core B on a BF561
*
- * 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
+ * Copyright 2004-2009 Analog Devices Inc.
+ * Licensed under the GPL-2 or later.
+ */
+
+/* The Core B reset func requires code in the application that is loaded into
+ * Core B. In order to reset, the application needs to install an interrupt
+ * handler for Supplemental Interrupt 0, that sets RETI to 0xff600000 and
+ * writes bit 11 of SICB_SYSCR when bit 5 of SICA_SYSCR is 0. This causes Core
+ * B to stall when Supplemental Interrupt 0 is set, and will reset PC to
+ * 0xff600000 when COREB_SRAM_INIT is cleared.
*/
-#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 <linux/fs.h>
-#include <asm/dma.h>
-#include <asm/cacheflush.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
+#include <linux/kernel.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
-#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;
-
- flush_dcache_range((unsigned long)buf, (unsigned long)(buf+len));
- /* 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, 0);
- /* 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;
-
- invalidate_dcache_range((unsigned long)buf, (unsigned long)(buf+len));
- /* 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, 0);
- /* 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)
+static int
+coreb_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
- 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;
-}
-
-/* No BKL needed here */
-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;
+ int ret = 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_unlock_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_unlock_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
+ default:
+ ret = -EINVAL;
+ break;
}
- return retval;
+ CSYNC();
+
+ return ret;
}
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
+ .owner = THIS_MODULE,
+ .ioctl = coreb_ioctl,
};
static struct miscdevice coreb_dev = {
- COREB_MINOR,
- "coreb",
- &coreb_fops
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "coreb",
+ .fops = &coreb_fops,
};
-static ssize_t coreb_show_status(struct device *dev, struct device_attribute *attr, char *buf)
+static int __init bf561_coreb_init(void)
{
- 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;
+ return misc_register(&coreb_dev);
}
+module_init(bf561_coreb_init);
-void __exit bf561_coreb_exit(void)
+static 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>");
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff