linux/arch/blackfin/mach-bf561/coreb.c
Linus Torvalds 7f38839628 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/vapier/blackfin
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/vapier/blackfin: (47 commits)
  Blackfin: bfin_spi.h: add MMR peripheral layout
  Blackfin: bfin_ppi.h: start a common PPI/EPPI header
  Blackfin: bfin_can.h: add missing VERSION/VERSION2 MMRs
  Blackfin: bf538: add missing SIC_RVECT define
  Blackfin: bf561: rewrite SICA_xxx to just SIC_xxx
  Blackfin: bf54x: add missing SIC_RVECT definition
  Blackfin: H8606: move 8250 irqflags to platform resources
  Blackfin: glue XIP/ROM kernel kconfigs
  Blackfin: update sparse flags for latest upstream changes
  Blackfin: coreb: update ioctl numbers
  Blackfin: coreb: add gpl module license
  Blackfin: bf518-ezkit: add ssm2603 codec resources
  Blackfin: bf51x/bf52x: fix 16/32bit SPORT MMR helpers
  Blackfin: tll6527m: new board port
  Blackfin: bf526-ezbrd/bf527-ezkit: add NAND partition for u-boot
  Blackfin: merge kernel init memory back into main memory region
  Blackfin: gpio: add peripheral group check
  Blackfin: dma: bf54x: add missing break for SPORT1 TX IRQ
  Blackfin: add new cacheflush syscall
  Blackfin: bf548-ezkit: increase u-boot partition size
  ...
2010-10-22 21:12:27 -07:00

78 lines
1.9 KiB
C

/* Load firmware into Core B on a BF561
*
* 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/device.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#define CMD_COREB_START _IO('b', 0)
#define CMD_COREB_STOP _IO('b', 1)
#define CMD_COREB_RESET _IO('b', 2)
static long
coreb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
int ret = 0;
switch (cmd) {
case CMD_COREB_START:
bfin_write_SYSCR(bfin_read_SYSCR() & ~0x0020);
break;
case CMD_COREB_STOP:
bfin_write_SYSCR(bfin_read_SYSCR() | 0x0020);
bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | 0x0080);
break;
case CMD_COREB_RESET:
bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | 0x0080);
break;
default:
ret = -EINVAL;
break;
}
CSYNC();
return ret;
}
static const struct file_operations coreb_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = coreb_ioctl,
.llseek = noop_llseek,
};
static struct miscdevice coreb_dev = {
.minor = MISC_DYNAMIC_MINOR,
.name = "coreb",
.fops = &coreb_fops,
};
static int __init bf561_coreb_init(void)
{
return misc_register(&coreb_dev);
}
module_init(bf561_coreb_init);
static void __exit bf561_coreb_exit(void)
{
misc_deregister(&coreb_dev);
}
module_exit(bf561_coreb_exit);
MODULE_AUTHOR("Bas Vermeulen <bvermeul@blackstar.xs4all.nl>");
MODULE_DESCRIPTION("BF561 Core B Support");
MODULE_LICENSE("GPL");