diff options
Diffstat (limited to 'arch/mips/mti-sead3/sead3-int.c')
| -rw-r--r-- | arch/mips/mti-sead3/sead3-int.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/arch/mips/mti-sead3/sead3-int.c b/arch/mips/mti-sead3/sead3-int.c new file mode 100644 index 00000000000..e26e08274fc --- /dev/null +++ b/arch/mips/mti-sead3/sead3-int.c @@ -0,0 +1,158 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + */ +#include <linux/init.h> +#include <linux/irq.h> +#include <linux/io.h> + +#include <asm/gic.h> +#include <asm/irq_cpu.h> +#include <asm/setup.h> + +#include <asm/mips-boards/sead3int.h> + +#define SEAD_CONFIG_GIC_PRESENT_SHF 1 +#define SEAD_CONFIG_GIC_PRESENT_MSK (1 << SEAD_CONFIG_GIC_PRESENT_SHF) +#define SEAD_CONFIG_BASE 0x1b100110 +#define SEAD_CONFIG_SIZE 4 + +int gic_present; +static unsigned long sead3_config_reg; + +/* + * This table defines the setup for each external GIC interrupt. It is + * indexed by interrupt number. + */ +#define GIC_CPU_NMI GIC_MAP_TO_NMI_MSK +static struct gic_intr_map gic_intr_map[GIC_NUM_INTRS] = { + { 0, GIC_CPU_INT4, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT }, + { 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT }, + { 0, GIC_CPU_INT2, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT }, + { 0, GIC_CPU_INT2, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT }, + { 0, GIC_CPU_INT1, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT }, + { 0, GIC_CPU_INT0, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT }, + { 0, GIC_CPU_INT0, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT }, + { 0, GIC_CPU_INT0, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT }, + { 0, GIC_CPU_INT0, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT }, + { GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED }, + { GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED }, + { GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED }, + { GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED }, + { GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED }, + { GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED }, + { GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED }, +}; + +asmlinkage void plat_irq_dispatch(void) +{ + unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM; + int irq; + + irq = (fls(pending) - CAUSEB_IP - 1); + if (irq >= 0) + do_IRQ(MIPS_CPU_IRQ_BASE + irq); + else + spurious_interrupt(); +} + +void __init arch_init_irq(void) +{ + int i; + + if (!cpu_has_veic) { + mips_cpu_irq_init(); + + if (cpu_has_vint) { + /* install generic handler */ + for (i = 0; i < 8; i++) + set_vi_handler(i, plat_irq_dispatch); + } + } + + sead3_config_reg = (unsigned long)ioremap_nocache(SEAD_CONFIG_BASE, + SEAD_CONFIG_SIZE); + gic_present = (REG32(sead3_config_reg) & SEAD_CONFIG_GIC_PRESENT_MSK) >> + SEAD_CONFIG_GIC_PRESENT_SHF; + pr_info("GIC: %spresent\n", (gic_present) ? "" : "not "); + pr_info("EIC: %s\n", + (current_cpu_data.options & MIPS_CPU_VEIC) ? "on" : "off"); + + if (gic_present) + gic_init(GIC_BASE_ADDR, GIC_ADDRSPACE_SZ, gic_intr_map, + ARRAY_SIZE(gic_intr_map), MIPS_GIC_IRQ_BASE); +} + +void gic_enable_interrupt(int irq_vec) +{ + unsigned int i, irq_source; + + /* enable all the interrupts associated with this vector */ + for (i = 0; i < gic_shared_intr_map[irq_vec].num_shared_intr; i++) { + irq_source = gic_shared_intr_map[irq_vec].intr_list[i]; + GIC_SET_INTR_MASK(irq_source); + } + /* enable all local interrupts associated with this vector */ + if (gic_shared_intr_map[irq_vec].local_intr_mask) { + GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), 0); + GICWRITE(GIC_REG(VPE_OTHER, GIC_VPE_SMASK), + gic_shared_intr_map[irq_vec].local_intr_mask); + } +} + +void gic_disable_interrupt(int irq_vec) +{ + unsigned int i, irq_source; + + /* disable all the interrupts associated with this vector */ + for (i = 0; i < gic_shared_intr_map[irq_vec].num_shared_intr; i++) { + irq_source = gic_shared_intr_map[irq_vec].intr_list[i]; + GIC_CLR_INTR_MASK(irq_source); + } + /* disable all local interrupts associated with this vector */ + if (gic_shared_intr_map[irq_vec].local_intr_mask) { + GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), 0); + GICWRITE(GIC_REG(VPE_OTHER, GIC_VPE_RMASK), + gic_shared_intr_map[irq_vec].local_intr_mask); + } +} + +void gic_irq_ack(struct irq_data *d) +{ + GIC_CLR_INTR_MASK(d->irq - gic_irq_base); +} + +void gic_finish_irq(struct irq_data *d) +{ + unsigned int irq = (d->irq - gic_irq_base); + unsigned int i, irq_source; + + /* Clear edge detectors. */ + for (i = 0; i < gic_shared_intr_map[irq].num_shared_intr; i++) { + irq_source = gic_shared_intr_map[irq].intr_list[i]; + if (gic_irq_flags[irq_source] & GIC_TRIG_EDGE) + GICWRITE(GIC_REG(SHARED, GIC_SH_WEDGE), irq_source); + } + + /* Enable interrupts. */ + GIC_SET_INTR_MASK(irq); +} + +void __init gic_platform_init(int irqs, struct irq_chip *irq_controller) +{ + int i; + + /* + * For non-EIC mode, we want to setup the GIC in pass-through + * mode, as if the GIC didn't exist. Do not map any interrupts + * for an external interrupt controller. + */ + if (!cpu_has_veic) + return; + + for (i = gic_irq_base; i < (gic_irq_base + irqs); i++) + irq_set_chip_and_handler(i, irq_controller, handle_percpu_irq); +} |