diff options
Diffstat (limited to 'kernel/drivers/irqchip/irq-mips-gic.c')
| -rw-r--r-- | kernel/drivers/irqchip/irq-mips-gic.c | 872 |
1 files changed, 872 insertions, 0 deletions
diff --git a/kernel/drivers/irqchip/irq-mips-gic.c b/kernel/drivers/irqchip/irq-mips-gic.c new file mode 100644 index 000000000..269c2354c --- /dev/null +++ b/kernel/drivers/irqchip/irq-mips-gic.c @@ -0,0 +1,872 @@ +/* + * 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) 2008 Ralf Baechle (ralf@linux-mips.org) + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + */ +#include <linux/bitmap.h> +#include <linux/clocksource.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/irqchip/mips-gic.h> +#include <linux/of_address.h> +#include <linux/sched.h> +#include <linux/smp.h> + +#include <asm/mips-cm.h> +#include <asm/setup.h> +#include <asm/traps.h> + +#include <dt-bindings/interrupt-controller/mips-gic.h> + +#include "irqchip.h" + +unsigned int gic_present; + +struct gic_pcpu_mask { + DECLARE_BITMAP(pcpu_mask, GIC_MAX_INTRS); +}; + +static void __iomem *gic_base; +static struct gic_pcpu_mask pcpu_masks[NR_CPUS]; +static DEFINE_SPINLOCK(gic_lock); +static struct irq_domain *gic_irq_domain; +static int gic_shared_intrs; +static int gic_vpes; +static unsigned int gic_cpu_pin; +static unsigned int timer_cpu_pin; +static struct irq_chip gic_level_irq_controller, gic_edge_irq_controller; + +static void __gic_irq_dispatch(void); + +static inline unsigned int gic_read(unsigned int reg) +{ + return __raw_readl(gic_base + reg); +} + +static inline void gic_write(unsigned int reg, unsigned int val) +{ + __raw_writel(val, gic_base + reg); +} + +static inline void gic_update_bits(unsigned int reg, unsigned int mask, + unsigned int val) +{ + unsigned int regval; + + regval = gic_read(reg); + regval &= ~mask; + regval |= val; + gic_write(reg, regval); +} + +static inline void gic_reset_mask(unsigned int intr) +{ + gic_write(GIC_REG(SHARED, GIC_SH_RMASK) + GIC_INTR_OFS(intr), + 1 << GIC_INTR_BIT(intr)); +} + +static inline void gic_set_mask(unsigned int intr) +{ + gic_write(GIC_REG(SHARED, GIC_SH_SMASK) + GIC_INTR_OFS(intr), + 1 << GIC_INTR_BIT(intr)); +} + +static inline void gic_set_polarity(unsigned int intr, unsigned int pol) +{ + gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_POLARITY) + + GIC_INTR_OFS(intr), 1 << GIC_INTR_BIT(intr), + pol << GIC_INTR_BIT(intr)); +} + +static inline void gic_set_trigger(unsigned int intr, unsigned int trig) +{ + gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_TRIGGER) + + GIC_INTR_OFS(intr), 1 << GIC_INTR_BIT(intr), + trig << GIC_INTR_BIT(intr)); +} + +static inline void gic_set_dual_edge(unsigned int intr, unsigned int dual) +{ + gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_DUAL) + GIC_INTR_OFS(intr), + 1 << GIC_INTR_BIT(intr), + dual << GIC_INTR_BIT(intr)); +} + +static inline void gic_map_to_pin(unsigned int intr, unsigned int pin) +{ + gic_write(GIC_REG(SHARED, GIC_SH_INTR_MAP_TO_PIN_BASE) + + GIC_SH_MAP_TO_PIN(intr), GIC_MAP_TO_PIN_MSK | pin); +} + +static inline void gic_map_to_vpe(unsigned int intr, unsigned int vpe) +{ + gic_write(GIC_REG(SHARED, GIC_SH_INTR_MAP_TO_VPE_BASE) + + GIC_SH_MAP_TO_VPE_REG_OFF(intr, vpe), + GIC_SH_MAP_TO_VPE_REG_BIT(vpe)); +} + +#ifdef CONFIG_CLKSRC_MIPS_GIC +cycle_t gic_read_count(void) +{ + unsigned int hi, hi2, lo; + + do { + hi = gic_read(GIC_REG(SHARED, GIC_SH_COUNTER_63_32)); + lo = gic_read(GIC_REG(SHARED, GIC_SH_COUNTER_31_00)); + hi2 = gic_read(GIC_REG(SHARED, GIC_SH_COUNTER_63_32)); + } while (hi2 != hi); + + return (((cycle_t) hi) << 32) + lo; +} + +unsigned int gic_get_count_width(void) +{ + unsigned int bits, config; + + config = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG)); + bits = 32 + 4 * ((config & GIC_SH_CONFIG_COUNTBITS_MSK) >> + GIC_SH_CONFIG_COUNTBITS_SHF); + + return bits; +} + +void gic_write_compare(cycle_t cnt) +{ + gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI), + (int)(cnt >> 32)); + gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO), + (int)(cnt & 0xffffffff)); +} + +void gic_write_cpu_compare(cycle_t cnt, int cpu) +{ + unsigned long flags; + + local_irq_save(flags); + + gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), cpu); + gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_HI), + (int)(cnt >> 32)); + gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_LO), + (int)(cnt & 0xffffffff)); + + local_irq_restore(flags); +} + +cycle_t gic_read_compare(void) +{ + unsigned int hi, lo; + + hi = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI)); + lo = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO)); + + return (((cycle_t) hi) << 32) + lo; +} + +void gic_start_count(void) +{ + u32 gicconfig; + + /* Start the counter */ + gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG)); + gicconfig &= ~(1 << GIC_SH_CONFIG_COUNTSTOP_SHF); + gic_write(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig); +} + +void gic_stop_count(void) +{ + u32 gicconfig; + + /* Stop the counter */ + gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG)); + gicconfig |= 1 << GIC_SH_CONFIG_COUNTSTOP_SHF; + gic_write(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig); +} + +#endif + +static bool gic_local_irq_is_routable(int intr) +{ + u32 vpe_ctl; + + /* All local interrupts are routable in EIC mode. */ + if (cpu_has_veic) + return true; + + vpe_ctl = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_CTL)); + switch (intr) { + case GIC_LOCAL_INT_TIMER: + return vpe_ctl & GIC_VPE_CTL_TIMER_RTBL_MSK; + case GIC_LOCAL_INT_PERFCTR: + return vpe_ctl & GIC_VPE_CTL_PERFCNT_RTBL_MSK; + case GIC_LOCAL_INT_FDC: + return vpe_ctl & GIC_VPE_CTL_FDC_RTBL_MSK; + case GIC_LOCAL_INT_SWINT0: + case GIC_LOCAL_INT_SWINT1: + return vpe_ctl & GIC_VPE_CTL_SWINT_RTBL_MSK; + default: + return true; + } +} + +static void gic_bind_eic_interrupt(int irq, int set) +{ + /* Convert irq vector # to hw int # */ + irq -= GIC_PIN_TO_VEC_OFFSET; + + /* Set irq to use shadow set */ + gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_EIC_SHADOW_SET_BASE) + + GIC_VPE_EIC_SS(irq), set); +} + +void gic_send_ipi(unsigned int intr) +{ + gic_write(GIC_REG(SHARED, GIC_SH_WEDGE), GIC_SH_WEDGE_SET(intr)); +} + +int gic_get_c0_compare_int(void) +{ + if (!gic_local_irq_is_routable(GIC_LOCAL_INT_TIMER)) + return MIPS_CPU_IRQ_BASE + cp0_compare_irq; + return irq_create_mapping(gic_irq_domain, + GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_TIMER)); +} + +int gic_get_c0_perfcount_int(void) +{ + if (!gic_local_irq_is_routable(GIC_LOCAL_INT_PERFCTR)) { + /* Is the performance counter shared with the timer? */ + if (cp0_perfcount_irq < 0) + return -1; + return MIPS_CPU_IRQ_BASE + cp0_perfcount_irq; + } + return irq_create_mapping(gic_irq_domain, + GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_PERFCTR)); +} + +int gic_get_c0_fdc_int(void) +{ + if (!gic_local_irq_is_routable(GIC_LOCAL_INT_FDC)) { + /* Is the FDC IRQ even present? */ + if (cp0_fdc_irq < 0) + return -1; + return MIPS_CPU_IRQ_BASE + cp0_fdc_irq; + } + + /* + * Some cores claim the FDC is routable but it doesn't actually seem to + * be connected. + */ + switch (current_cpu_type()) { + case CPU_INTERAPTIV: + case CPU_PROAPTIV: + return -1; + } + + return irq_create_mapping(gic_irq_domain, + GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_FDC)); +} + +static void gic_handle_shared_int(bool chained) +{ + unsigned int i, intr, virq; + unsigned long *pcpu_mask; + unsigned long pending_reg, intrmask_reg; + DECLARE_BITMAP(pending, GIC_MAX_INTRS); + DECLARE_BITMAP(intrmask, GIC_MAX_INTRS); + + /* Get per-cpu bitmaps */ + pcpu_mask = pcpu_masks[smp_processor_id()].pcpu_mask; + + pending_reg = GIC_REG(SHARED, GIC_SH_PEND); + intrmask_reg = GIC_REG(SHARED, GIC_SH_MASK); + + for (i = 0; i < BITS_TO_LONGS(gic_shared_intrs); i++) { + pending[i] = gic_read(pending_reg); + intrmask[i] = gic_read(intrmask_reg); + pending_reg += 0x4; + intrmask_reg += 0x4; + } + + bitmap_and(pending, pending, intrmask, gic_shared_intrs); + bitmap_and(pending, pending, pcpu_mask, gic_shared_intrs); + + intr = find_first_bit(pending, gic_shared_intrs); + while (intr != gic_shared_intrs) { + virq = irq_linear_revmap(gic_irq_domain, + GIC_SHARED_TO_HWIRQ(intr)); + if (chained) + generic_handle_irq(virq); + else + do_IRQ(virq); + + /* go to next pending bit */ + bitmap_clear(pending, intr, 1); + intr = find_first_bit(pending, gic_shared_intrs); + } +} + +static void gic_mask_irq(struct irq_data *d) +{ + gic_reset_mask(GIC_HWIRQ_TO_SHARED(d->hwirq)); +} + +static void gic_unmask_irq(struct irq_data *d) +{ + gic_set_mask(GIC_HWIRQ_TO_SHARED(d->hwirq)); +} + +static void gic_ack_irq(struct irq_data *d) +{ + unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq); + + gic_write(GIC_REG(SHARED, GIC_SH_WEDGE), GIC_SH_WEDGE_CLR(irq)); +} + +static int gic_set_type(struct irq_data *d, unsigned int type) +{ + unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq); + unsigned long flags; + bool is_edge; + + spin_lock_irqsave(&gic_lock, flags); + switch (type & IRQ_TYPE_SENSE_MASK) { + case IRQ_TYPE_EDGE_FALLING: + gic_set_polarity(irq, GIC_POL_NEG); + gic_set_trigger(irq, GIC_TRIG_EDGE); + gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE); + is_edge = true; + break; + case IRQ_TYPE_EDGE_RISING: + gic_set_polarity(irq, GIC_POL_POS); + gic_set_trigger(irq, GIC_TRIG_EDGE); + gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE); + is_edge = true; + break; + case IRQ_TYPE_EDGE_BOTH: + /* polarity is irrelevant in this case */ + gic_set_trigger(irq, GIC_TRIG_EDGE); + gic_set_dual_edge(irq, GIC_TRIG_DUAL_ENABLE); + is_edge = true; + break; + case IRQ_TYPE_LEVEL_LOW: + gic_set_polarity(irq, GIC_POL_NEG); + gic_set_trigger(irq, GIC_TRIG_LEVEL); + gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE); + is_edge = false; + break; + case IRQ_TYPE_LEVEL_HIGH: + default: + gic_set_polarity(irq, GIC_POL_POS); + gic_set_trigger(irq, GIC_TRIG_LEVEL); + gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE); + is_edge = false; + break; + } + + if (is_edge) { + __irq_set_chip_handler_name_locked(d->irq, + &gic_edge_irq_controller, + handle_edge_irq, NULL); + } else { + __irq_set_chip_handler_name_locked(d->irq, + &gic_level_irq_controller, + handle_level_irq, NULL); + } + spin_unlock_irqrestore(&gic_lock, flags); + + return 0; +} + +#ifdef CONFIG_SMP +static int gic_set_affinity(struct irq_data *d, const struct cpumask *cpumask, + bool force) +{ + unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq); + cpumask_t tmp = CPU_MASK_NONE; + unsigned long flags; + int i; + + cpumask_and(&tmp, cpumask, cpu_online_mask); + if (cpumask_empty(&tmp)) + return -EINVAL; + + /* Assumption : cpumask refers to a single CPU */ + spin_lock_irqsave(&gic_lock, flags); + + /* Re-route this IRQ */ + gic_map_to_vpe(irq, cpumask_first(&tmp)); + + /* Update the pcpu_masks */ + for (i = 0; i < NR_CPUS; i++) + clear_bit(irq, pcpu_masks[i].pcpu_mask); + set_bit(irq, pcpu_masks[cpumask_first(&tmp)].pcpu_mask); + + cpumask_copy(d->affinity, cpumask); + spin_unlock_irqrestore(&gic_lock, flags); + + return IRQ_SET_MASK_OK_NOCOPY; +} +#endif + +static struct irq_chip gic_level_irq_controller = { + .name = "MIPS GIC", + .irq_mask = gic_mask_irq, + .irq_unmask = gic_unmask_irq, + .irq_set_type = gic_set_type, +#ifdef CONFIG_SMP + .irq_set_affinity = gic_set_affinity, +#endif +}; + +static struct irq_chip gic_edge_irq_controller = { + .name = "MIPS GIC", + .irq_ack = gic_ack_irq, + .irq_mask = gic_mask_irq, + .irq_unmask = gic_unmask_irq, + .irq_set_type = gic_set_type, +#ifdef CONFIG_SMP + .irq_set_affinity = gic_set_affinity, +#endif +}; + +static void gic_handle_local_int(bool chained) +{ + unsigned long pending, masked; + unsigned int intr, virq; + + pending = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_PEND)); + masked = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_MASK)); + + bitmap_and(&pending, &pending, &masked, GIC_NUM_LOCAL_INTRS); + + intr = find_first_bit(&pending, GIC_NUM_LOCAL_INTRS); + while (intr != GIC_NUM_LOCAL_INTRS) { + virq = irq_linear_revmap(gic_irq_domain, + GIC_LOCAL_TO_HWIRQ(intr)); + if (chained) + generic_handle_irq(virq); + else + do_IRQ(virq); + + /* go to next pending bit */ + bitmap_clear(&pending, intr, 1); + intr = find_first_bit(&pending, GIC_NUM_LOCAL_INTRS); + } +} + +static void gic_mask_local_irq(struct irq_data *d) +{ + int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq); + + gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_RMASK), 1 << intr); +} + +static void gic_unmask_local_irq(struct irq_data *d) +{ + int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq); + + gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_SMASK), 1 << intr); +} + +static struct irq_chip gic_local_irq_controller = { + .name = "MIPS GIC Local", + .irq_mask = gic_mask_local_irq, + .irq_unmask = gic_unmask_local_irq, +}; + +static void gic_mask_local_irq_all_vpes(struct irq_data *d) +{ + int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq); + int i; + unsigned long flags; + + spin_lock_irqsave(&gic_lock, flags); + for (i = 0; i < gic_vpes; i++) { + gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i); + gic_write(GIC_REG(VPE_OTHER, GIC_VPE_RMASK), 1 << intr); + } + spin_unlock_irqrestore(&gic_lock, flags); +} + +static void gic_unmask_local_irq_all_vpes(struct irq_data *d) +{ + int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq); + int i; + unsigned long flags; + + spin_lock_irqsave(&gic_lock, flags); + for (i = 0; i < gic_vpes; i++) { + gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i); + gic_write(GIC_REG(VPE_OTHER, GIC_VPE_SMASK), 1 << intr); + } + spin_unlock_irqrestore(&gic_lock, flags); +} + +static struct irq_chip gic_all_vpes_local_irq_controller = { + .name = "MIPS GIC Local", + .irq_mask = gic_mask_local_irq_all_vpes, + .irq_unmask = gic_unmask_local_irq_all_vpes, +}; + +static void __gic_irq_dispatch(void) +{ + gic_handle_local_int(false); + gic_handle_shared_int(false); +} + +static void gic_irq_dispatch(unsigned int irq, struct irq_desc *desc) +{ + gic_handle_local_int(true); + gic_handle_shared_int(true); +} + +#ifdef CONFIG_MIPS_GIC_IPI +static int gic_resched_int_base; +static int gic_call_int_base; + +unsigned int plat_ipi_resched_int_xlate(unsigned int cpu) +{ + return gic_resched_int_base + cpu; +} + +unsigned int plat_ipi_call_int_xlate(unsigned int cpu) +{ + return gic_call_int_base + cpu; +} + +static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id) +{ + scheduler_ipi(); + + return IRQ_HANDLED; +} + +static irqreturn_t ipi_call_interrupt(int irq, void *dev_id) +{ + smp_call_function_interrupt(); + + return IRQ_HANDLED; +} + +static struct irqaction irq_resched = { + .handler = ipi_resched_interrupt, + .flags = IRQF_PERCPU, + .name = "IPI resched" +}; + +static struct irqaction irq_call = { + .handler = ipi_call_interrupt, + .flags = IRQF_PERCPU, + .name = "IPI call" +}; + +static __init void gic_ipi_init_one(unsigned int intr, int cpu, + struct irqaction *action) +{ + int virq = irq_create_mapping(gic_irq_domain, + GIC_SHARED_TO_HWIRQ(intr)); + int i; + + gic_map_to_vpe(intr, cpu); + for (i = 0; i < NR_CPUS; i++) + clear_bit(intr, pcpu_masks[i].pcpu_mask); + set_bit(intr, pcpu_masks[cpu].pcpu_mask); + + irq_set_irq_type(virq, IRQ_TYPE_EDGE_RISING); + + irq_set_handler(virq, handle_percpu_irq); + setup_irq(virq, action); +} + +static __init void gic_ipi_init(void) +{ + int i; + + /* Use last 2 * NR_CPUS interrupts as IPIs */ + gic_resched_int_base = gic_shared_intrs - nr_cpu_ids; + gic_call_int_base = gic_resched_int_base - nr_cpu_ids; + + for (i = 0; i < nr_cpu_ids; i++) { + gic_ipi_init_one(gic_call_int_base + i, i, &irq_call); + gic_ipi_init_one(gic_resched_int_base + i, i, &irq_resched); + } +} +#else +static inline void gic_ipi_init(void) +{ +} +#endif + +static void __init gic_basic_init(void) +{ + unsigned int i; + + board_bind_eic_interrupt = &gic_bind_eic_interrupt; + + /* Setup defaults */ + for (i = 0; i < gic_shared_intrs; i++) { + gic_set_polarity(i, GIC_POL_POS); + gic_set_trigger(i, GIC_TRIG_LEVEL); + gic_reset_mask(i); + } + + for (i = 0; i < gic_vpes; i++) { + unsigned int j; + + gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i); + for (j = 0; j < GIC_NUM_LOCAL_INTRS; j++) { + if (!gic_local_irq_is_routable(j)) + continue; + gic_write(GIC_REG(VPE_OTHER, GIC_VPE_RMASK), 1 << j); + } + } +} + +static int gic_local_irq_domain_map(struct irq_domain *d, unsigned int virq, + irq_hw_number_t hw) +{ + int intr = GIC_HWIRQ_TO_LOCAL(hw); + int ret = 0; + int i; + unsigned long flags; + + if (!gic_local_irq_is_routable(intr)) + return -EPERM; + + /* + * HACK: These are all really percpu interrupts, but the rest + * of the MIPS kernel code does not use the percpu IRQ API for + * the CP0 timer and performance counter interrupts. + */ + switch (intr) { + case GIC_LOCAL_INT_TIMER: + case GIC_LOCAL_INT_PERFCTR: + case GIC_LOCAL_INT_FDC: + irq_set_chip_and_handler(virq, + &gic_all_vpes_local_irq_controller, + handle_percpu_irq); + break; + default: + irq_set_chip_and_handler(virq, + &gic_local_irq_controller, + handle_percpu_devid_irq); + irq_set_percpu_devid(virq); + break; + } + + spin_lock_irqsave(&gic_lock, flags); + for (i = 0; i < gic_vpes; i++) { + u32 val = GIC_MAP_TO_PIN_MSK | gic_cpu_pin; + + gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i); + + switch (intr) { + case GIC_LOCAL_INT_WD: + gic_write(GIC_REG(VPE_OTHER, GIC_VPE_WD_MAP), val); + break; + case GIC_LOCAL_INT_COMPARE: + gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_MAP), val); + break; + case GIC_LOCAL_INT_TIMER: + /* CONFIG_MIPS_CMP workaround (see __gic_init) */ + val = GIC_MAP_TO_PIN_MSK | timer_cpu_pin; + gic_write(GIC_REG(VPE_OTHER, GIC_VPE_TIMER_MAP), val); + break; + case GIC_LOCAL_INT_PERFCTR: + gic_write(GIC_REG(VPE_OTHER, GIC_VPE_PERFCTR_MAP), val); + break; + case GIC_LOCAL_INT_SWINT0: + gic_write(GIC_REG(VPE_OTHER, GIC_VPE_SWINT0_MAP), val); + break; + case GIC_LOCAL_INT_SWINT1: + gic_write(GIC_REG(VPE_OTHER, GIC_VPE_SWINT1_MAP), val); + break; + case GIC_LOCAL_INT_FDC: + gic_write(GIC_REG(VPE_OTHER, GIC_VPE_FDC_MAP), val); + break; + default: + pr_err("Invalid local IRQ %d\n", intr); + ret = -EINVAL; + break; + } + } + spin_unlock_irqrestore(&gic_lock, flags); + + return ret; +} + +static int gic_shared_irq_domain_map(struct irq_domain *d, unsigned int virq, + irq_hw_number_t hw) +{ + int intr = GIC_HWIRQ_TO_SHARED(hw); + unsigned long flags; + + irq_set_chip_and_handler(virq, &gic_level_irq_controller, + handle_level_irq); + + spin_lock_irqsave(&gic_lock, flags); + gic_map_to_pin(intr, gic_cpu_pin); + /* Map to VPE 0 by default */ + gic_map_to_vpe(intr, 0); + set_bit(intr, pcpu_masks[0].pcpu_mask); + spin_unlock_irqrestore(&gic_lock, flags); + + return 0; +} + +static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq, + irq_hw_number_t hw) +{ + if (GIC_HWIRQ_TO_LOCAL(hw) < GIC_NUM_LOCAL_INTRS) + return gic_local_irq_domain_map(d, virq, hw); + return gic_shared_irq_domain_map(d, virq, hw); +} + +static int gic_irq_domain_xlate(struct irq_domain *d, struct device_node *ctrlr, + const u32 *intspec, unsigned int intsize, + irq_hw_number_t *out_hwirq, + unsigned int *out_type) +{ + if (intsize != 3) + return -EINVAL; + + if (intspec[0] == GIC_SHARED) + *out_hwirq = GIC_SHARED_TO_HWIRQ(intspec[1]); + else if (intspec[0] == GIC_LOCAL) + *out_hwirq = GIC_LOCAL_TO_HWIRQ(intspec[1]); + else + return -EINVAL; + *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK; + + return 0; +} + +static struct irq_domain_ops gic_irq_domain_ops = { + .map = gic_irq_domain_map, + .xlate = gic_irq_domain_xlate, +}; + +static void __init __gic_init(unsigned long gic_base_addr, + unsigned long gic_addrspace_size, + unsigned int cpu_vec, unsigned int irqbase, + struct device_node *node) +{ + unsigned int gicconfig; + + gic_base = ioremap_nocache(gic_base_addr, gic_addrspace_size); + + gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG)); + gic_shared_intrs = (gicconfig & GIC_SH_CONFIG_NUMINTRS_MSK) >> + GIC_SH_CONFIG_NUMINTRS_SHF; + gic_shared_intrs = ((gic_shared_intrs + 1) * 8); + + gic_vpes = (gicconfig & GIC_SH_CONFIG_NUMVPES_MSK) >> + GIC_SH_CONFIG_NUMVPES_SHF; + gic_vpes = gic_vpes + 1; + + if (cpu_has_veic) { + /* Always use vector 1 in EIC mode */ + gic_cpu_pin = 0; + timer_cpu_pin = gic_cpu_pin; + set_vi_handler(gic_cpu_pin + GIC_PIN_TO_VEC_OFFSET, + __gic_irq_dispatch); + } else { + gic_cpu_pin = cpu_vec - GIC_CPU_PIN_OFFSET; + irq_set_chained_handler(MIPS_CPU_IRQ_BASE + cpu_vec, + gic_irq_dispatch); + /* + * With the CMP implementation of SMP (deprecated), other CPUs + * are started by the bootloader and put into a timer based + * waiting poll loop. We must not re-route those CPU's local + * timer interrupts as the wait instruction will never finish, + * so just handle whatever CPU interrupt it is routed to by + * default. + * + * This workaround should be removed when CMP support is + * dropped. + */ + if (IS_ENABLED(CONFIG_MIPS_CMP) && + gic_local_irq_is_routable(GIC_LOCAL_INT_TIMER)) { + timer_cpu_pin = gic_read(GIC_REG(VPE_LOCAL, + GIC_VPE_TIMER_MAP)) & + GIC_MAP_MSK; + irq_set_chained_handler(MIPS_CPU_IRQ_BASE + + GIC_CPU_PIN_OFFSET + + timer_cpu_pin, + gic_irq_dispatch); + } else { + timer_cpu_pin = gic_cpu_pin; + } + } + + gic_irq_domain = irq_domain_add_simple(node, GIC_NUM_LOCAL_INTRS + + gic_shared_intrs, irqbase, + &gic_irq_domain_ops, NULL); + if (!gic_irq_domain) + panic("Failed to add GIC IRQ domain"); + + gic_basic_init(); + + gic_ipi_init(); +} + +void __init gic_init(unsigned long gic_base_addr, + unsigned long gic_addrspace_size, + unsigned int cpu_vec, unsigned int irqbase) +{ + __gic_init(gic_base_addr, gic_addrspace_size, cpu_vec, irqbase, NULL); +} + +static int __init gic_of_init(struct device_node *node, + struct device_node *parent) +{ + struct resource res; + unsigned int cpu_vec, i = 0, reserved = 0; + phys_addr_t gic_base; + size_t gic_len; + + /* Find the first available CPU vector. */ + while (!of_property_read_u32_index(node, "mti,reserved-cpu-vectors", + i++, &cpu_vec)) + reserved |= BIT(cpu_vec); + for (cpu_vec = 2; cpu_vec < 8; cpu_vec++) { + if (!(reserved & BIT(cpu_vec))) + break; + } + if (cpu_vec == 8) { + pr_err("No CPU vectors available for GIC\n"); + return -ENODEV; + } + + if (of_address_to_resource(node, 0, &res)) { + /* + * Probe the CM for the GIC base address if not specified + * in the device-tree. + */ + if (mips_cm_present()) { + gic_base = read_gcr_gic_base() & + ~CM_GCR_GIC_BASE_GICEN_MSK; + gic_len = 0x20000; + } else { + pr_err("Failed to get GIC memory range\n"); + return -ENODEV; + } + } else { + gic_base = res.start; + gic_len = resource_size(&res); + } + + if (mips_cm_present()) + write_gcr_gic_base(gic_base | CM_GCR_GIC_BASE_GICEN_MSK); + gic_present = true; + + __gic_init(gic_base, gic_len, cpu_vec, 0, node); + + return 0; +} +IRQCHIP_DECLARE(mips_gic, "mti,gic", gic_of_init); |