path: root/arch/blackfin/mach-common/ints-priority.c

/*
 * Set up the interrupt priorities
 *
 * Copyright  2004-2009 Analog Devices Inc.
 *                 2003 Bas Vermeulen <bas@buyways.nl>
 *                 2002 Arcturus Networks Inc. MaTed <mated@sympatico.ca>
 *            2000-2001 Lineo, Inc. D. Jefff Dionne <jeff@lineo.ca>
 *                 1999 D. Jeff Dionne <jeff@uclinux.org>
 *                 1996 Roman Zippel
 *
 * Licensed under the GPL-2
 */

#include <linux/module.h>
#include <linux/kernel_stat.h>
#include <linux/seq_file.h>
#include <linux/irq.h>
#include <linux/sched.h>
#ifdef CONFIG_IPIPE
#include <linux/ipipe.h>
#endif
#include <asm/traps.h>
#include <asm/blackfin.h>
#include <asm/gpio.h>
#include <asm/irq_handler.h>
#include <asm/dpmc.h>

#define SIC_SYSIRQ(irq)	(irq - (IRQ_CORETMR + 1))

/*
 * NOTES:
 * - we have separated the physical Hardware interrupt from the
 * levels that the LINUX kernel sees (see the description in irq.h)
 * -
 */

#ifndef CONFIG_SMP
/* Initialize this to an actual value to force it into the .data
 * section so that we know it is properly initialized at entry into
 * the kernel but before bss is initialized to zero (which is where
 * it would live otherwise).  The 0x1f magic represents the IRQs we
 * cannot actually mask out in hardware.
 */
unsigned long bfin_irq_flags = 0x1f;
EXPORT_SYMBOL(bfin_irq_flags);
#endif

#ifdef CONFIG_PM
unsigned long bfin_sic_iwr[3];	/* Up to 3 SIC_IWRx registers */
unsigned vr_wakeup;
#endif

static struct ivgx {
	/* irq number for request_irq, available in mach-bf5xx/irq.h */
	unsigned int irqno;
	/* corresponding bit in the SIC_ISR register */
	unsigned int isrflag;
} ivg_table[NR_PERI_INTS];

static struct ivg_slice {
	/* position of first irq in ivg_table for given ivg */
	struct ivgx *ifirst;
	struct ivgx *istop;
} ivg7_13[IVG13 - IVG7 + 1];


/*
 * Search SIC_IAR and fill tables with the irqvalues
 * and their positions in the SIC_ISR register.
 */
static void __init search_IAR(void)
{
	unsigned ivg, irq_pos = 0;
	for (ivg = 0; ivg <= IVG13 - IVG7; ivg++) {
		int irqN;

		ivg7_13[ivg].istop = ivg7_13[ivg].ifirst = &ivg_table[irq_pos];

		for (irqN = 0; irqN < NR_PERI_INTS; irqN += 4) {
			int irqn;
			u32 iar = bfin_read32((unsigned long *)SIC_IAR0 +
#if defined(CONFIG_BF51x) || defined(CONFIG_BF52x) || \
	defined(CONFIG_BF538) || defined(CONFIG_BF539)
				((irqN % 32) >> 3) + ((irqN / 32) * ((SIC_IAR4 - SIC_IAR0) / 4))
#else
				(irqN >> 3)
#endif
				);

			for (irqn = irqN; irqn < irqN + 4; ++irqn) {
				int iar_shift = (irqn & 7) * 4;
				if (ivg == (0xf & (iar >> iar_shift))) {
					ivg_table[irq_pos].irqno = IVG7 + irqn;
					ivg_table[irq_pos].isrflag = 1 << (irqn % 32);
					ivg7_13[ivg].istop++;
					irq_pos++;
				}
			}
		}