diff options
Diffstat (limited to 'arch/blackfin/mach-bf561/coreb.c')
| -rw-r--r-- | arch/blackfin/mach-bf561/coreb.c | 396 |
1 files changed, 32 insertions, 364 deletions
diff --git a/arch/blackfin/mach-bf561/coreb.c b/arch/blackfin/mach-bf561/coreb.c index 8598098c0840..93635a766f9c 100644 --- a/arch/blackfin/mach-bf561/coreb.c +++ b/arch/blackfin/mach-bf561/coreb.c @@ -1,406 +1,74 @@ -/* - * 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>"); |