tx4927_irq.c

linux-2.4.29操作系统的源码

/*
 * Common tx4927 irq handler
 *
 * Author: MontaVista Software, Inc.
 *         [e-mail]
 *
 *  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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel_stat.h>
#include <linux/module.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/timex.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/irq.h>
#include <asm/bitops.h>
#include <asm/bootinfo.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mipsregs.h>
#include <asm/system.h>
#include <asm/tx4927/tx4927.h>

/*
 * DEBUG
 */
#define TX4927_IRQ_CHECK_CP0
#define TX4927_IRQ_CHECK_PIC

#undef TX4927_IRQ_DEBUG

#ifdef TX4927_IRQ_DEBUG
#define TX4927_IRQ_NONE        0x00000000

#define TX4927_IRQ_INFO        ( 1 <<  0 )
#define TX4927_IRQ_WARN        ( 1 <<  1 )
#define TX4927_IRQ_EROR        ( 1 <<  2 )

#define TX4927_IRQ_INIT        ( 1 <<  5 )
#define TX4927_IRQ_NEST1       ( 1 <<  6 )
#define TX4927_IRQ_NEST2       ( 1 <<  7 )
#define TX4927_IRQ_NEST3       ( 1 <<  8 )
#define TX4927_IRQ_NEST4       ( 1 <<  9 )

#define TX4927_IRQ_CP0_INIT     ( 1 << 10 )
#define TX4927_IRQ_CP0_STARTUP  ( 1 << 11 )
#define TX4927_IRQ_CP0_SHUTDOWN ( 1 << 12 )
#define TX4927_IRQ_CP0_ENABLE   ( 1 << 13 )
#define TX4927_IRQ_CP0_DISABLE  ( 1 << 14 )
#define TX4927_IRQ_CP0_MASK     ( 1 << 15 )
#define TX4927_IRQ_CP0_ENDIRQ   ( 1 << 16 )

#define TX4927_IRQ_PIC_INIT     ( 1 << 20 )
#define TX4927_IRQ_PIC_STARTUP  ( 1 << 21 )
#define TX4927_IRQ_PIC_SHUTDOWN ( 1 << 22 )
#define TX4927_IRQ_PIC_ENABLE   ( 1 << 23 )
#define TX4927_IRQ_PIC_DISABLE  ( 1 << 24 )
#define TX4927_IRQ_PIC_MASK     ( 1 << 25 )
#define TX4927_IRQ_PIC_ENDIRQ   ( 1 << 26 )

#define TX4927_IRQ_ALL         0xffffffff
#endif

#ifdef TX4927_IRQ_DEBUG
static const u32 tx4927_irq_debug_flag = (TX4927_IRQ_NONE
					  | TX4927_IRQ_INFO
					  | TX4927_IRQ_WARN | TX4927_IRQ_EROR
//                                       | TX4927_IRQ_CP0_INIT
//                                       | TX4927_IRQ_CP0_STARTUP
//                                       | TX4927_IRQ_CP0_SHUTDOWN
//                                       | TX4927_IRQ_CP0_ENABLE
//                                       | TX4927_IRQ_CP0_DISABLE
//                                       | TX4927_IRQ_CP0_MASK
//                                       | TX4927_IRQ_CP0_ENDIRQ
//                                       | TX4927_IRQ_PIC_INIT
//                                       | TX4927_IRQ_PIC_STARTUP
//                                       | TX4927_IRQ_PIC_SHUTDOWN
//                                       | TX4927_IRQ_PIC_ENABLE
//                                       | TX4927_IRQ_PIC_DISABLE
//                                       | TX4927_IRQ_PIC_MASK
//                                       | TX4927_IRQ_PIC_ENDIRQ
//                                       | TX4927_IRQ_INIT
//                                       | TX4927_IRQ_NEST1
//                                       | TX4927_IRQ_NEST2
//                                       | TX4927_IRQ_NEST3
//                                       | TX4927_IRQ_NEST4
    );
#endif

#ifdef TX4927_IRQ_DEBUG
#define TX4927_IRQ_DPRINTK(flag,str...) \
        if ( (tx4927_irq_debug_flag) & (flag) ) \
        { \
           char tmp[100]; \
           sprintf( tmp, str ); \
           printk( "%s(%s:%u)::%s", __FUNCTION__, __FILE__, __LINE__, tmp ); \
        }
#else
#define TX4927_IRQ_DPRINTK(flag,str...)
#endif

/*
 * Forwad definitions for all pic's
 */

static unsigned int tx4927_irq_cp0_startup(unsigned int irq);
static void tx4927_irq_cp0_shutdown(unsigned int irq);
static void tx4927_irq_cp0_enable(unsigned int irq);
static void tx4927_irq_cp0_disable(unsigned int irq);
static void tx4927_irq_cp0_mask_and_ack(unsigned int irq);
static void tx4927_irq_cp0_end(unsigned int irq);

static unsigned int tx4927_irq_pic_startup(unsigned int irq);
static void tx4927_irq_pic_shutdown(unsigned int irq);
static void tx4927_irq_pic_enable(unsigned int irq);
static void tx4927_irq_pic_disable(unsigned int irq);
static void tx4927_irq_pic_mask_and_ack(unsigned int irq);
static void tx4927_irq_pic_end(unsigned int irq);

/*
 * Kernel structs for all pic's
 */

static spinlock_t tx4927_cp0_lock = SPIN_LOCK_UNLOCKED;
static spinlock_t tx4927_pic_lock = SPIN_LOCK_UNLOCKED;

#define TX4927_CP0_NAME "TX4927-CP0"
static struct hw_interrupt_type tx4927_irq_cp0_type = {
	typename:	TX4927_CP0_NAME,
	startup:	tx4927_irq_cp0_startup,
	shutdown:	tx4927_irq_cp0_shutdown,
	enable:		tx4927_irq_cp0_enable,
	disable:	tx4927_irq_cp0_disable,
	ack:		tx4927_irq_cp0_mask_and_ack,
	end:		tx4927_irq_cp0_end,
	set_affinity:	NULL
};

#define TX4927_PIC_NAME "TX4927-PIC"
static struct hw_interrupt_type tx4927_irq_pic_type = {
	typename:	TX4927_PIC_NAME,
	startup:	tx4927_irq_pic_startup,
	shutdown:	tx4927_irq_pic_shutdown,
	enable:		tx4927_irq_pic_enable,
	disable:	tx4927_irq_pic_disable,
	ack:		tx4927_irq_pic_mask_and_ack,
	end:		tx4927_irq_pic_end,
	set_affinity:	NULL
};

#define TX4927_PIC_ACTION(s) { no_action, 0, 0, s, NULL, NULL }
static struct irqaction tx4927_irq_pic_action =
TX4927_PIC_ACTION(TX4927_PIC_NAME);

#define CCP0_STATUS 12
#define CCP0_CAUSE 13

/*
 * Functions for cp0
 */

#define tx4927_irq_cp0_mask(irq) ( 1 << ( irq-TX4927_IRQ_CP0_BEG+8 ) )

static void tx4927_irq_cp0_modify(unsigned cp0_reg, unsigned clr_bits,
	unsigned set_bits)
{
	unsigned long val = 0;

	switch (cp0_reg) {
	case CCP0_STATUS:
		val = read_c0_status();
		break;

	case CCP0_CAUSE:
		val = read_c0_cause();
		break;

	}

	val &= (~clr_bits);
	val |= (set_bits);

	switch (cp0_reg) {
	case CCP0_STATUS:{
			write_c0_status(val);
			break;
		}
	case CCP0_CAUSE:{
			write_c0_cause(val);
			break;
		}
	}

	return;
}

static void __init tx4927_irq_cp0_init(void)
{
	int i;

	TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_INIT, "beg=%d end=%d\n",
			   TX4927_IRQ_CP0_BEG, TX4927_IRQ_CP0_END);

	for (i = TX4927_IRQ_CP0_BEG; i <= TX4927_IRQ_CP0_END; i++) {
		irq_desc[i].status = IRQ_DISABLED;
		irq_desc[i].action = 0;
		irq_desc[i].depth = 1;
		irq_desc[i].handler = &tx4927_irq_cp0_type;
	}

	return;
}

static unsigned int tx4927_irq_cp0_startup(unsigned int irq)
{
	TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_STARTUP, "irq=%d \n", irq);

#ifdef TX4927_IRQ_CHECK_CP0
	{
		if (irq < TX4927_IRQ_CP0_BEG || irq > TX4927_IRQ_CP0_END) {
			TX4927_IRQ_DPRINTK(TX4927_IRQ_EROR,
					   "bad irq=%d \n", irq);
			panic("\n");
		}
	}
#endif

	tx4927_irq_cp0_enable(irq);

	return (0);
}

static void tx4927_irq_cp0_shutdown(unsigned int irq)
{
	TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_SHUTDOWN, "irq=%d \n", irq);

#ifdef TX4927_IRQ_CHECK_CP0
	{
		if (irq < TX4927_IRQ_CP0_BEG || irq > TX4927_IRQ_CP0_END) {
			TX4927_IRQ_DPRINTK(TX4927_IRQ_EROR,
					   "bad irq=%d \n", irq);
			panic("\n");
		}
	}
#endif

	tx4927_irq_cp0_disable(irq);

	return;
}

static void tx4927_irq_cp0_enable(unsigned int irq)
{
	unsigned long flags;

	TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_ENABLE, "irq=%d \n", irq);

#ifdef TX4927_IRQ_CHECK_CP0
	{
		if (irq < TX4927_IRQ_CP0_BEG || irq > TX4927_IRQ_CP0_END) {
			TX4927_IRQ_DPRINTK(TX4927_IRQ_EROR,
					   "bad irq=%d \n", irq);
			panic("\n");
		}
	}
#endif

	spin_lock_irqsave(&tx4927_cp0_lock, flags);

	tx4927_irq_cp0_modify(CCP0_STATUS, 0, tx4927_irq_cp0_mask(irq));

	spin_unlock_irqrestore(&tx4927_cp0_lock, flags);

	return;
}

static void tx4927_irq_cp0_disable(unsigned int irq)
{
	unsigned long flags;

	TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_DISABLE, "irq=%d \n", irq);

#ifdef TX4927_IRQ_CHECK_CP0
	{
		if (irq < TX4927_IRQ_CP0_BEG || irq > TX4927_IRQ_CP0_END) {
			TX4927_IRQ_DPRINTK(TX4927_IRQ_EROR,
					   "bad irq=%d \n", irq);
			panic("\n");
		}
	}
#endif

	spin_lock_irqsave(&tx4927_cp0_lock, flags);

	tx4927_irq_cp0_modify(CCP0_STATUS, tx4927_irq_cp0_mask(irq), 0);

	spin_unlock_irqrestore(&tx4927_cp0_lock, flags);

	return;
}

static void tx4927_irq_cp0_mask_and_ack(unsigned int irq)
{
	TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_MASK, "irq=%d \n", irq);

#ifdef TX4927_IRQ_CHECK_CP0
	{
		if (irq < TX4927_IRQ_CP0_BEG || irq > TX4927_IRQ_CP0_END) {
			TX4927_IRQ_DPRINTK(TX4927_IRQ_EROR,
					   "bad irq=%d \n", irq);
			panic("\n");
		}
	}
#endif

	tx4927_irq_cp0_disable(irq);

	return;
}

static void tx4927_irq_cp0_end(unsigned int irq)
{
	TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_ENDIRQ, "irq=%d \n", irq);

#ifdef TX4927_IRQ_CHECK_CP0
	{
		if (irq < TX4927_IRQ_CP0_BEG || irq > TX4927_IRQ_CP0_END) {
			TX4927_IRQ_DPRINTK(TX4927_IRQ_EROR,
					   "bad irq=%d \n", irq);
			panic("\n");
		}
	}