/*
* File: arch/blackfin/mach-common/ints-priority-dc.c
* Based on:
* Author:
*
* Created: ?
* Description: Set up the interrupt priorities
*
* Modified:
* 1996 Roman Zippel
* 1999 D. Jeff Dionne <jeff@uclinux.org>
* 2000-2001 Lineo, Inc. D. Jefff Dionne <jeff@lineo.ca>
* 2002 Arcturus Networks Inc. MaTed <mated@sympatico.ca>
* 2003 Metrowerks/Motorola
* 2003 Bas Vermeulen <bas@buyways.nl>
* 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
*/
#include <linux/module.h>
#include <linux/kernel_stat.h>
#include <linux/seq_file.h>
#include <linux/irq.h>
#ifdef CONFIG_KGDB
#include <linux/kgdb.h>
#endif
#include <asm/traps.h>
#include <asm/blackfin.h>
#include <asm/gpio.h>
#include <asm/irq_handler.h>
/*
* NOTES:
* - we have separated the physical Hardware interrupt from the
* levels that the LINUX kernel sees (see the description in irq.h)
* -
*/
unsigned long irq_flags = 0;
/* The number of spurious interrupts */
atomic_t num_spurious;
struct ivgx {
/* irq number for request_irq, available in mach-bf561/irq.h */
int irqno;
/* corresponding bit in the SICA_ISR0 register */
int isrflag0;
/* corresponding bit in the SICA_ISR1 register */
int isrflag1;
} ivg_table[NR_PERI_INTS];
struct ivg_slice {
/* position of first irq in ivg_table for given ivg */
struct ivgx *ifirst;
struct ivgx *istop;
} ivg7_13[IVG13 - IVG7 + 1];
static void search_IAR(void);
/*
* 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++) {
int iar_shift = (irqn & 7) * 4;
if (ivg ==
(0xf &
bfin_read32((unsigned long *)SICA_IAR0 +
(irqn >> 3)) >> iar_shift)) {
ivg_table[irq_pos].irqno = IVG7 + irqn;
ivg_table[irq_pos].isrflag0 =
(irqn < 32 ? (1 << irqn) : 0);
ivg_table[irq_pos].isrflag1 =
(irqn < 32 ? 0 : (1 << (irqn - 32)));
ivg7_13[ivg].istop++;
irq_pos++;
}
}
}
}
/*
* This is for BF561 internal IRQs
*/
static void ack_noop(unsigned int irq)
{
/* Dummy function. */
}
static void bf561_core_mask_irq(unsigned int irq)
{
irq_flags &= ~(1 << irq);
if (!irqs_disabled())
local_irq_enable();
}
static void bf561_core_unmask_irq(unsigned int irq)
{
irq_flags |= 1 << irq;
/*
* If interrupts are enabled, IMASK must contain the same value
* as irq_flags. Make sure that invariant holds. If interrupts
* are currently disabled we need not do anything; one of the
* callers will take care of setting IMASK to the proper value
* when reenabling interrupts.
* local_irq_enable just does "STI irq_flags", so it's exactly
* what we need.
*/
if (!irqs_disabled())
local_irq_enable();
return;
}
static void bf561_internal_mask_irq(unsigned int irq)
{
unsigned long irq_mask;
if ((irq - (IRQ_CORETMR + 1)) < 32) {
irq_mask = (1 << (irq - (IRQ_CORETMR + 1)));
bfin_write_SICA_IMASK0(bfin_read_SICA_IMASK0() & ~irq_mask);
} else {
irq_mask = (1 << (irq - (IRQ_CORETMR + 1) - 32));
bfin_write_SICA_IMASK1(bfin_read_SICA_IMASK1() & ~irq_mask);
}
}
static void bf561_internal_unmask_irq(unsigned int irq)
{
unsigned long irq_mask;
if ((irq - (IRQ_CORETMR + 1)) < 32) {
irq_mask = (1 << (irq - (IRQ_CORETMR + 1)));
bfin_write_SICA_IMASK0(bfin_read_SICA_IMASK0() | irq_mask);
} else {
irq_mask = (1 << (irq - (IRQ_CORETMR + 1) - 32));
bfin_write_SICA_IMASK1(bfin_read_SICA_IMASK1() | irq_mask);
}
SSYNC();
}
static struct irq_chip bf561_core_irqchip = {
.ack = ack_noop,
.mask = bf561_core_mask_irq,
.unmask = bf561_core_unmask_irq,
};
static struct irq_chip bf561_internal_irqchip = {
.ack = ack_noop,
.mask = bf561_internal_mask_irq,
.unmask = bf561_internal_unmask_irq,
};
#ifdef CONFIG_IRQCHIP_DEMUX_GPIO
static unsigned short gpio_enabled[gpio_bank(MAX_BLACKFIN_GPIOS)];
static unsigned short gpio_edge_triggered[gpio_bank(MAX_BLACKFIN_GPIOS)];
static void bf561_gpio_ack_irq(unsigned int irq)
{
u16 gpionr = irq - IRQ_PF0;
if (gpio_edge_triggered[gpio_bank(gpionr)] & gpio_bit(gpionr)) {
set_gpio_data(gpionr, 0);
SSYNC();
}
}
static void bf561_gpio_mask_ack_irq(unsigned int irq)
{
u16 gpionr = irq - IRQ_PF0;
if (gpio_edge_triggered[gpio_bank(gpionr)] & gpio_bit(gpionr)) {
set_gpio_data(gpionr, 0);
SSYNC();
}
set_gpio_maska(gpionr, 0);
SSYNC();
}
static void bf561_gpio_mask_irq(unsigned int irq)
{
set_gpio_maska(irq - IRQ_PF0, 0);
SSYNC();
}
static void bf561_gpio_unmask_irq(unsigned int irq)
{
set_gpio_maska(irq - IRQ_PF0, 1);
SSYNC();
}
static unsigned int bf561_gpio_irq_startup(unsigned int irq)
{
unsigned int ret;
u16 gpionr = irq - IRQ_PF0;
if (!(gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))) {
ret = gpio_request(gpionr, NULL);
if (ret)
return ret;
}
gpio_enabled[gpio_bank(gpionr)] |= gpio_bit(gpionr);
bf561_gpio_unmask_irq(irq);
return ret;
}
static void bf561_gpio_irq_shutdown(unsigned int irq)
{
bf561_gpio_mask_irq(irq);
gpio_free(irq - IRQ_PF0);
gpio_enabled[gpio_bank(irq - IRQ_PF0)] &= ~gpio_bit(irq - IRQ_PF0);
}
static int bf561_gpio_irq_type(unsigned int irq, unsigned int type)
{
unsigned int ret;
u16 gpionr = irq - IRQ_PF0;
if (type == IRQ_TYPE_PROBE) {
/* only probe unenabled GPIO interrupt lines */
if (gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))
return 0;
type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
}
if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING |
IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
if (!(gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))) {
ret = gpio_request(gpionr, NULL);
if (ret)
return ret;
}
gpio_enabled[gpio_bank(gpionr)] |= gpio_bit(gpionr);
} else {
gpio_enabled[gpio_bank(gpionr)] &= ~gpio_bit(gpionr);
return 0;
}
set_gpio_dir(gpionr, 0);
set_gpio_inen(gpionr, 1);
if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
gpio_edge_triggered[gpio_bank(gpionr)] |= gpio_bit(gpionr);
set_gpio_edge(gpionr, 1);
} else {
set_gpio_edge(gpionr, 0);
gpio_edge_triggered[gpio_bank(gpionr)] &= ~gpio_bit(gpionr);
}
if ((type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
== (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
set_gpio_both(gpionr, 1);
else
set_gpio_both(gpionr, 0);
if ((type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW)))
set_gpio_polar(gpionr, 1); /* low or falling edge denoted by one */
else
set_gpio_polar(gpionr, 0); /* high or rising edge denoted by zero */
SSYNC();
if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
set_irq_handler(irq, handle_edge_irq);
else
set_irq_handler(irq, handle_level_irq);
return 0;
}
static struct irq_chip bf561_gpio_irqchip = {
.ack = bf561_gpio_ack_irq,
.mask = bf561_gpio_mask_irq,
.mask_ack = bf561_gpio_mask_ack_irq,
.unmask = bf561_gpio_unmask_irq,
.set_type = bf561_gpio_irq_type,
.startup = bf561_gpio_irq_startup,
.shutdown = bf561_gpio_irq_shutdown
};
static void bf561_demux_gpio_irq(unsigned int inta_irq,
struct irq_desc *intb_desc)
{
int irq, flag_d, mask;
u16 gpio;
switch (inta_irq) {
case IRQ_PROG0_INTA:
irq = IRQ_PF0;
break;
case IRQ_PROG1_INTA:
irq = IRQ_PF16;
break;
case IRQ_PROG2_INTA:
irq = IRQ_PF32;
break;
default:
dump_stack();
return;
}
gpio = irq - IRQ_PF0;
flag_d = get_gpiop_data(gpio);
mask = flag_d & (gpio_enabled[gpio_bank(gpio)] &
get_gpiop_maska(gpio));
do {
if (mask & 1) {
struct irq_desc *desc = irq_desc + irq;
desc->handle_irq(irq, desc);
}
irq++;
mask >>= 1;
} while (mask);
}
#endif /* CONFIG_IRQCHIP_DEMUX_GPIO */
/*
* This function should be called during kernel startup to initialize
* the BFin IRQ handling routines.
*/
int __init init_arch_irq(void)
{
int irq;
unsigned long ilat = 0;
/* Disable all the peripheral intrs - page 4-29 HW Ref manual */
bfin_write_SICA_IMASK0(SIC_UNMASK_ALL);
bfin_write_SICA_IMASK1(SIC_UNMASK_ALL);
SSYNC();
bfin_write_SICA_IWR0(IWR_ENABLE_ALL);
bfin_write_SICA_IWR1(IWR_ENABLE_ALL);
local_irq_disable();
init_exception_buff();
#ifndef CONFIG_KGDB
bfin_write_EVT0(evt_emulation);
#endif
bfin_write_EVT2(evt_evt2);
bfin_write_EVT3(trap);
bfin_write_EVT5(evt_ivhw);
bfin_write_EVT6(evt_timer);
bfin_write_EVT7(evt_evt7);
bfin_write_EVT8(evt_evt8);
bfin_write_EVT9(evt_evt9);
bfin_write_EVT10(evt_evt10);
bfin_write_EVT11(evt_evt11);
bfin_write_EVT12(evt_evt12);
bfin_write_EVT13(evt_evt13);
bfin_write_EVT14(evt14_softirq);
bfin_write_EVT15(evt_system_call);
CSYNC();
for (irq = 0; irq <= SYS_IRQS; irq++) {
if (irq <= IRQ_CORETMR)
set_irq_chip(irq, &bf561_core_irqchip);
else
set_irq_chip(irq, &bf561_internal_irqchip);
#ifdef CONFIG_IRQCHIP_DEMUX_GPIO
if ((irq != IRQ_PROG0_INTA) &&
(irq != IRQ_PROG1_INTA) && (irq != IRQ_PROG2_INTA)) {
#endif
set_irq_handler(irq, handle_simple_irq);
#ifdef CONFIG_IRQCHIP_DEMUX_GPIO
} else {
set_irq_chained_handler(irq, bf561_demux_gpio_irq);
}
#endif
}
#ifdef CONFIG_IRQCHIP_DEMUX_GPIO
for (irq = IRQ_PF0; irq <= IRQ_PF47; irq++) {
set_irq_chip(irq, &bf561_gpio_irqchip);
/* if configured as edge, then will be changed to do_edge_IRQ */
set_irq_handler(irq, handle_level_irq);
}
#endif
bfin_write_IMASK(0);
CSYNC();
ilat = bfin_read_ILAT();
CSYNC();
bfin_write_ILAT(ilat);
CSYNC();
printk(KERN_INFO "Configuring Blackfin Priority Driven Interrupts\n");
/* IMASK=xxx is equivalent to STI xx or irq_flags=xx,
* local_irq_enable()
*/
program_IAR();
/* Therefore it's better to setup IARs before interrupts enabled */
search_IAR();
/* Enable interrupts IVG7-15 */
irq_flags = irq_flags | IMASK_IVG15 |
IMASK_IVG14 | IMASK_IVG13 | IMASK_IVG12 | IMASK_IVG11 |
IMASK_IVG10 | IMASK_IVG9 | IMASK_IVG8 | IMASK_IVG7 | IMASK_IVGHW;
return 0;
}
#ifdef CONFIG_DO_IRQ_L1
void do_irq(int vec, struct pt_regs *fp)__attribute__((l1_text));
#endif
void do_irq(int vec, struct pt_regs *fp)
{
if (vec == EVT_IVTMR_P) {
vec = IRQ_CORETMR;
} else {
struct ivgx *ivg = ivg7_13[vec - IVG7].ifirst;
struct ivgx *ivg_stop = ivg7_13[vec - IVG7].istop;
unsigned long sic_status0, sic_status1;
SSYNC();
sic_status0 = bfin_read_SICA_IMASK0() & bfin_read_SICA_ISR0();
sic_status1 = bfin_read_SICA_IMASK1() & bfin_read_SICA_ISR1();
for (;; ivg++) {
if (ivg >= ivg_stop) {
atomic_inc(&num_spurious);
return;
} else if ((sic_status0 & ivg->isrflag0) ||
(sic_status1 & ivg->isrflag1))
break;
}
vec = ivg->irqno;
}
asm_do_IRQ(vec, fp);
#ifdef CONFIG_KGDB
kgdb_process_breakpoint();
#endif
}
