diff options
Diffstat (limited to 'kernel/arch/mips/rb532/irq.c')
| -rw-r--r-- | kernel/arch/mips/rb532/irq.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/kernel/arch/mips/rb532/irq.c b/kernel/arch/mips/rb532/irq.c new file mode 100644 index 000000000..3a431e802 --- /dev/null +++ b/kernel/arch/mips/rb532/irq.c @@ -0,0 +1,235 @@ +/* + * 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 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. + * + * Copyright 2002 MontaVista Software Inc. + * Author: MontaVista Software, Inc. + * stevel@mvista.com or source@mvista.com + */ + +#include <linux/bitops.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/io.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/random.h> +#include <linux/delay.h> + +#include <asm/bootinfo.h> +#include <asm/time.h> +#include <asm/mipsregs.h> + +#include <asm/mach-rc32434/irq.h> +#include <asm/mach-rc32434/gpio.h> + +struct intr_group { + u32 mask; /* mask of valid bits in pending/mask registers */ + volatile u32 *base_addr; +}; + +#define RC32434_NR_IRQS (GROUP4_IRQ_BASE + 32) + +#if (NR_IRQS < RC32434_NR_IRQS) +#error Too little irqs defined. Did you override <asm/irq.h> ? +#endif + +static const struct intr_group intr_group[NUM_INTR_GROUPS] = { + { + .mask = 0x0000efff, + .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 0 * IC_GROUP_OFFSET)}, + { + .mask = 0x00001fff, + .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 1 * IC_GROUP_OFFSET)}, + { + .mask = 0x00000007, + .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 2 * IC_GROUP_OFFSET)}, + { + .mask = 0x0003ffff, + .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 3 * IC_GROUP_OFFSET)}, + { + .mask = 0xffffffff, + .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 4 * IC_GROUP_OFFSET)} +}; + +#define READ_PEND(base) (*(base)) +#define READ_MASK(base) (*(base + 2)) +#define WRITE_MASK(base, val) (*(base + 2) = (val)) + +static inline int irq_to_group(unsigned int irq_nr) +{ + return (irq_nr - GROUP0_IRQ_BASE) >> 5; +} + +static inline int group_to_ip(unsigned int group) +{ + return group + 2; +} + +static inline void enable_local_irq(unsigned int ip) +{ + int ipnum = 0x100 << ip; + + set_c0_status(ipnum); +} + +static inline void disable_local_irq(unsigned int ip) +{ + int ipnum = 0x100 << ip; + + clear_c0_status(ipnum); +} + +static inline void ack_local_irq(unsigned int ip) +{ + int ipnum = 0x100 << ip; + + clear_c0_cause(ipnum); +} + +static void rb532_enable_irq(struct irq_data *d) +{ + unsigned int group, intr_bit, irq_nr = d->irq; + int ip = irq_nr - GROUP0_IRQ_BASE; + volatile unsigned int *addr; + + if (ip < 0) + enable_local_irq(irq_nr); + else { + group = ip >> 5; + + ip &= (1 << 5) - 1; + intr_bit = 1 << ip; + + enable_local_irq(group_to_ip(group)); + + addr = intr_group[group].base_addr; + WRITE_MASK(addr, READ_MASK(addr) & ~intr_bit); + } +} + +static void rb532_disable_irq(struct irq_data *d) +{ + unsigned int group, intr_bit, mask, irq_nr = d->irq; + int ip = irq_nr - GROUP0_IRQ_BASE; + volatile unsigned int *addr; + + if (ip < 0) { + disable_local_irq(irq_nr); + } else { + group = ip >> 5; + + ip &= (1 << 5) - 1; + intr_bit = 1 << ip; + addr = intr_group[group].base_addr; + mask = READ_MASK(addr); + mask |= intr_bit; + WRITE_MASK(addr, mask); + + /* There is a maximum of 14 GPIO interrupts */ + if (group == GPIO_MAPPED_IRQ_GROUP && irq_nr <= (GROUP4_IRQ_BASE + 13)) + rb532_gpio_set_istat(0, irq_nr - GPIO_MAPPED_IRQ_BASE); + + /* + * if there are no more interrupts enabled in this + * group, disable corresponding IP + */ + if (mask == intr_group[group].mask) + disable_local_irq(group_to_ip(group)); + } +} + +static void rb532_mask_and_ack_irq(struct irq_data *d) +{ + rb532_disable_irq(d); + ack_local_irq(group_to_ip(irq_to_group(d->irq))); +} + +static int rb532_set_type(struct irq_data *d, unsigned type) +{ + int gpio = d->irq - GPIO_MAPPED_IRQ_BASE; + int group = irq_to_group(d->irq); + + if (group != GPIO_MAPPED_IRQ_GROUP || d->irq > (GROUP4_IRQ_BASE + 13)) + return (type == IRQ_TYPE_LEVEL_HIGH) ? 0 : -EINVAL; + + switch (type) { + case IRQ_TYPE_LEVEL_HIGH: + rb532_gpio_set_ilevel(1, gpio); + break; + case IRQ_TYPE_LEVEL_LOW: + rb532_gpio_set_ilevel(0, gpio); + break; + default: + return -EINVAL; + } + + return 0; +} + +static struct irq_chip rc32434_irq_type = { + .name = "RB532", + .irq_ack = rb532_disable_irq, + .irq_mask = rb532_disable_irq, + .irq_mask_ack = rb532_mask_and_ack_irq, + .irq_unmask = rb532_enable_irq, + .irq_set_type = rb532_set_type, +}; + +void __init arch_init_irq(void) +{ + int i; + + pr_info("Initializing IRQ's: %d out of %d\n", RC32434_NR_IRQS, NR_IRQS); + + for (i = 0; i < RC32434_NR_IRQS; i++) + irq_set_chip_and_handler(i, &rc32434_irq_type, + handle_level_irq); +} + +/* Main Interrupt dispatcher */ +asmlinkage void plat_irq_dispatch(void) +{ + unsigned int ip, pend, group; + volatile unsigned int *addr; + unsigned int cp0_cause = read_c0_cause() & read_c0_status(); + + if (cp0_cause & CAUSEF_IP7) { + do_IRQ(7); + } else { + ip = (cp0_cause & 0x7c00); + if (ip) { + group = 21 + (fls(ip) - 32); + + addr = intr_group[group].base_addr; + + pend = READ_PEND(addr); + pend &= ~READ_MASK(addr); /* only unmasked interrupts */ + pend = 39 + (fls(pend) - 32); + do_IRQ((group << 5) + pend); + } + } +} |