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Commit 55620c86 authored by Paul Mundt's avatar Paul Mundt
Browse files

sh: irq: Rework the SR.IMASK bitmap handling. 



This tidies up how the SR.IMASK bitmap is managed, using the bitmap API
directly instead. At the same time, tidy up the irq_chip conversion a
bit.

Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 62669e61

arch/sh/kernel/cpu/irq/imask.c

+16 −48
Original line number Diff line number Diff line
@@ -18,38 +18,17 @@ 
#include <linux/spinlock.h>

#include <linux/cache.h>

#include <linux/irq.h>

#include <linux/bitmap.h>

#include <asm/system.h>

#include <asm/irq.h>



/* Bitmap of IRQ masked */

static unsigned long imask_mask = 0x7fff;

static int interrupt_priority = 0;



static void enable_imask_irq(unsigned int irq);

static void disable_imask_irq(unsigned int irq);

static void shutdown_imask_irq(unsigned int irq);

static void mask_and_ack_imask(unsigned int);

static void end_imask_irq(unsigned int irq);



#define IMASK_PRIORITY	15



static unsigned int startup_imask_irq(unsigned int irq)

{

	/* Nothing to do */

	return 0; /* never anything pending */

}



static struct irq_chip imask_irq_type = {

	.typename = "SR.IMASK",

	.startup = startup_imask_irq,

	.shutdown = shutdown_imask_irq,

	.enable = enable_imask_irq,

	.disable = disable_imask_irq,

	.ack = mask_and_ack_imask,

	.end = end_imask_irq

};

static DECLARE_BITMAP(imask_mask, IMASK_PRIORITY);

static int interrupt_priority;



void static inline set_interrupt_registers(int ip)

static inline void set_interrupt_registers(int ip)

{

	unsigned long __dummy;
@@ -72,42 +51,31 @@ void static inline set_interrupt_registers(int ip) 
		     : "t");

}



static void disable_imask_irq(unsigned int irq)

static void mask_imask_irq(unsigned int irq)

{

	clear_bit(irq, &imask_mask);

	if (interrupt_priority < IMASK_PRIORITY - irq)

		interrupt_priority = IMASK_PRIORITY - irq;



	set_interrupt_registers(interrupt_priority);

}



static void enable_imask_irq(unsigned int irq)

static void unmask_imask_irq(unsigned int irq)

{

	set_bit(irq, &imask_mask);

	interrupt_priority = IMASK_PRIORITY - ffz(imask_mask);



	interrupt_priority = IMASK_PRIORITY -

		find_first_zero_bit(imask_mask, IMASK_PRIORITY);

	set_interrupt_registers(interrupt_priority);

}



static void mask_and_ack_imask(unsigned int irq)

{

	disable_imask_irq(irq);

}



static void end_imask_irq(unsigned int irq)

{

	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))

		enable_imask_irq(irq);

}



static void shutdown_imask_irq(unsigned int irq)

{

	/* Nothing to do */

}

static struct irq_chip imask_irq_chip = {

	.typename	= "SR.IMASK",

	.mask		= mask_imask_irq,

	.unmask		= unmask_imask_irq,

	.mask_ack	= mask_imask_irq,

};



void make_imask_irq(unsigned int irq)

{

	disable_irq_nosync(irq);

	irq_desc[irq].chip = &imask_irq_type;

	enable_irq(irq);

	set_irq_chip_and_handler_name(irq, &imask_irq_chip,

				      handle_level_irq, "level");

}