| /* |
| * ARM Nested Vectored Interrupt Controller |
| * |
| * Copyright (c) 2006-2007 CodeSourcery. |
| * Written by Paul Brook |
| * |
| * This code is licenced under the GPL. |
| * |
| * The ARMv7M System controller is fairly tightly tied in with the |
| * NVIC. Much of that is also implemented here. |
| */ |
| |
| #include "sysbus.h" |
| #include "qemu-timer.h" |
| #include "arm-misc.h" |
| |
| /* 32 internal lines (16 used for system exceptions) plus 64 external |
| interrupt lines. */ |
| #define GIC_NIRQ 96 |
| #define NCPU 1 |
| #define NVIC 1 |
| |
| /* Only a single "CPU" interface is present. */ |
| static inline int |
| gic_get_current_cpu(void) |
| { |
| return 0; |
| } |
| |
| static uint32_t nvic_readl(void *opaque, uint32_t offset); |
| static void nvic_writel(void *opaque, uint32_t offset, uint32_t value); |
| |
| #include "arm_gic.c" |
| |
| typedef struct { |
| gic_state gic; |
| struct { |
| uint32_t control; |
| uint32_t reload; |
| int64_t tick; |
| QEMUTimer *timer; |
| } systick; |
| } nvic_state; |
| |
| /* qemu timers run at 1GHz. We want something closer to 1MHz. */ |
| #define SYSTICK_SCALE 1000ULL |
| |
| #define SYSTICK_ENABLE (1 << 0) |
| #define SYSTICK_TICKINT (1 << 1) |
| #define SYSTICK_CLKSOURCE (1 << 2) |
| #define SYSTICK_COUNTFLAG (1 << 16) |
| |
| int system_clock_scale; |
| |
| /* Conversion factor from qemu timer to SysTick frequencies. */ |
| static inline int64_t systick_scale(nvic_state *s) |
| { |
| if (s->systick.control & SYSTICK_CLKSOURCE) |
| return system_clock_scale; |
| else |
| return 1000; |
| } |
| |
| static void systick_reload(nvic_state *s, int reset) |
| { |
| if (reset) |
| s->systick.tick = qemu_get_clock_ns(vm_clock); |
| s->systick.tick += (s->systick.reload + 1) * systick_scale(s); |
| qemu_mod_timer(s->systick.timer, s->systick.tick); |
| } |
| |
| static void systick_timer_tick(void * opaque) |
| { |
| nvic_state *s = (nvic_state *)opaque; |
| s->systick.control |= SYSTICK_COUNTFLAG; |
| if (s->systick.control & SYSTICK_TICKINT) { |
| /* Trigger the interrupt. */ |
| armv7m_nvic_set_pending(s, ARMV7M_EXCP_SYSTICK); |
| } |
| if (s->systick.reload == 0) { |
| s->systick.control &= ~SYSTICK_ENABLE; |
| } else { |
| systick_reload(s, 0); |
| } |
| } |
| |
| /* The external routines use the hardware vector numbering, ie. the first |
| IRQ is #16. The internal GIC routines use #32 as the first IRQ. */ |
| void armv7m_nvic_set_pending(void *opaque, int irq) |
| { |
| nvic_state *s = (nvic_state *)opaque; |
| if (irq >= 16) |
| irq += 16; |
| gic_set_pending_private(&s->gic, 0, irq); |
| } |
| |
| /* Make pending IRQ active. */ |
| int armv7m_nvic_acknowledge_irq(void *opaque) |
| { |
| nvic_state *s = (nvic_state *)opaque; |
| uint32_t irq; |
| |
| irq = gic_acknowledge_irq(&s->gic, 0); |
| if (irq == 1023) |
| hw_error("Interrupt but no vector\n"); |
| if (irq >= 32) |
| irq -= 16; |
| return irq; |
| } |
| |
| void armv7m_nvic_complete_irq(void *opaque, int irq) |
| { |
| nvic_state *s = (nvic_state *)opaque; |
| if (irq >= 16) |
| irq += 16; |
| gic_complete_irq(&s->gic, 0, irq); |
| } |
| |
| static uint32_t nvic_readl(void *opaque, uint32_t offset) |
| { |
| nvic_state *s = (nvic_state *)opaque; |
| uint32_t val; |
| int irq; |
| |
| switch (offset) { |
| case 4: /* Interrupt Control Type. */ |
| return (GIC_NIRQ / 32) - 1; |
| case 0x10: /* SysTick Control and Status. */ |
| val = s->systick.control; |
| s->systick.control &= ~SYSTICK_COUNTFLAG; |
| return val; |
| case 0x14: /* SysTick Reload Value. */ |
| return s->systick.reload; |
| case 0x18: /* SysTick Current Value. */ |
| { |
| int64_t t; |
| if ((s->systick.control & SYSTICK_ENABLE) == 0) |
| return 0; |
| t = qemu_get_clock_ns(vm_clock); |
| if (t >= s->systick.tick) |
| return 0; |
| val = ((s->systick.tick - (t + 1)) / systick_scale(s)) + 1; |
| /* The interrupt in triggered when the timer reaches zero. |
| However the counter is not reloaded until the next clock |
| tick. This is a hack to return zero during the first tick. */ |
| if (val > s->systick.reload) |
| val = 0; |
| return val; |
| } |
| case 0x1c: /* SysTick Calibration Value. */ |
| return 10000; |
| case 0xd00: /* CPUID Base. */ |
| return cpu_single_env->cp15.c0_cpuid; |
| case 0xd04: /* Interrypt Control State. */ |
| /* VECTACTIVE */ |
| val = s->gic.running_irq[0]; |
| if (val == 1023) { |
| val = 0; |
| } else if (val >= 32) { |
| val -= 16; |
| } |
| /* RETTOBASE */ |
| if (s->gic.running_irq[0] == 1023 |
| || s->gic.last_active[s->gic.running_irq[0]][0] == 1023) { |
| val |= (1 << 11); |
| } |
| /* VECTPENDING */ |
| if (s->gic.current_pending[0] != 1023) |
| val |= (s->gic.current_pending[0] << 12); |
| /* ISRPENDING */ |
| for (irq = 32; irq < GIC_NIRQ; irq++) { |
| if (s->gic.irq_state[irq].pending) { |
| val |= (1 << 22); |
| break; |
| } |
| } |
| /* PENDSTSET */ |
| if (s->gic.irq_state[ARMV7M_EXCP_SYSTICK].pending) |
| val |= (1 << 26); |
| /* PENDSVSET */ |
| if (s->gic.irq_state[ARMV7M_EXCP_PENDSV].pending) |
| val |= (1 << 28); |
| /* NMIPENDSET */ |
| if (s->gic.irq_state[ARMV7M_EXCP_NMI].pending) |
| val |= (1 << 31); |
| return val; |
| case 0xd08: /* Vector Table Offset. */ |
| return cpu_single_env->v7m.vecbase; |
| case 0xd0c: /* Application Interrupt/Reset Control. */ |
| return 0xfa05000; |
| case 0xd10: /* System Control. */ |
| /* TODO: Implement SLEEPONEXIT. */ |
| return 0; |
| case 0xd14: /* Configuration Control. */ |
| /* TODO: Implement Configuration Control bits. */ |
| return 0; |
| case 0xd18: case 0xd1c: case 0xd20: /* System Handler Priority. */ |
| irq = offset - 0xd14; |
| val = 0; |
| val |= s->gic.priority1[irq++][0]; |
| val |= s->gic.priority1[irq++][0] << 8; |
| val |= s->gic.priority1[irq++][0] << 16; |
| val |= s->gic.priority1[irq][0] << 24; |
| return val; |
| case 0xd24: /* System Handler Status. */ |
| val = 0; |
| if (s->gic.irq_state[ARMV7M_EXCP_MEM].active) val |= (1 << 0); |
| if (s->gic.irq_state[ARMV7M_EXCP_BUS].active) val |= (1 << 1); |
| if (s->gic.irq_state[ARMV7M_EXCP_USAGE].active) val |= (1 << 3); |
| if (s->gic.irq_state[ARMV7M_EXCP_SVC].active) val |= (1 << 7); |
| if (s->gic.irq_state[ARMV7M_EXCP_DEBUG].active) val |= (1 << 8); |
| if (s->gic.irq_state[ARMV7M_EXCP_PENDSV].active) val |= (1 << 10); |
| if (s->gic.irq_state[ARMV7M_EXCP_SYSTICK].active) val |= (1 << 11); |
| if (s->gic.irq_state[ARMV7M_EXCP_USAGE].pending) val |= (1 << 12); |
| if (s->gic.irq_state[ARMV7M_EXCP_MEM].pending) val |= (1 << 13); |
| if (s->gic.irq_state[ARMV7M_EXCP_BUS].pending) val |= (1 << 14); |
| if (s->gic.irq_state[ARMV7M_EXCP_SVC].pending) val |= (1 << 15); |
| if (s->gic.irq_state[ARMV7M_EXCP_MEM].enabled) val |= (1 << 16); |
| if (s->gic.irq_state[ARMV7M_EXCP_BUS].enabled) val |= (1 << 17); |
| if (s->gic.irq_state[ARMV7M_EXCP_USAGE].enabled) val |= (1 << 18); |
| return val; |
| case 0xd28: /* Configurable Fault Status. */ |
| /* TODO: Implement Fault Status. */ |
| hw_error("Not implemented: Configurable Fault Status."); |
| return 0; |
| case 0xd2c: /* Hard Fault Status. */ |
| case 0xd30: /* Debug Fault Status. */ |
| case 0xd34: /* Mem Manage Address. */ |
| case 0xd38: /* Bus Fault Address. */ |
| case 0xd3c: /* Aux Fault Status. */ |
| /* TODO: Implement fault status registers. */ |
| goto bad_reg; |
| case 0xd40: /* PFR0. */ |
| return 0x00000030; |
| case 0xd44: /* PRF1. */ |
| return 0x00000200; |
| case 0xd48: /* DFR0. */ |
| return 0x00100000; |
| case 0xd4c: /* AFR0. */ |
| return 0x00000000; |
| case 0xd50: /* MMFR0. */ |
| return 0x00000030; |
| case 0xd54: /* MMFR1. */ |
| return 0x00000000; |
| case 0xd58: /* MMFR2. */ |
| return 0x00000000; |
| case 0xd5c: /* MMFR3. */ |
| return 0x00000000; |
| case 0xd60: /* ISAR0. */ |
| return 0x01141110; |
| case 0xd64: /* ISAR1. */ |
| return 0x02111000; |
| case 0xd68: /* ISAR2. */ |
| return 0x21112231; |
| case 0xd6c: /* ISAR3. */ |
| return 0x01111110; |
| case 0xd70: /* ISAR4. */ |
| return 0x01310102; |
| /* TODO: Implement debug registers. */ |
| default: |
| bad_reg: |
| hw_error("NVIC: Bad read offset 0x%x\n", offset); |
| } |
| } |
| |
| static void nvic_writel(void *opaque, uint32_t offset, uint32_t value) |
| { |
| nvic_state *s = (nvic_state *)opaque; |
| uint32_t oldval; |
| switch (offset) { |
| case 0x10: /* SysTick Control and Status. */ |
| oldval = s->systick.control; |
| s->systick.control &= 0xfffffff8; |
| s->systick.control |= value & 7; |
| if ((oldval ^ value) & SYSTICK_ENABLE) { |
| int64_t now = qemu_get_clock_ns(vm_clock); |
| if (value & SYSTICK_ENABLE) { |
| if (s->systick.tick) { |
| s->systick.tick += now; |
| qemu_mod_timer(s->systick.timer, s->systick.tick); |
| } else { |
| systick_reload(s, 1); |
| } |
| } else { |
| qemu_del_timer(s->systick.timer); |
| s->systick.tick -= now; |
| if (s->systick.tick < 0) |
| s->systick.tick = 0; |
| } |
| } else if ((oldval ^ value) & SYSTICK_CLKSOURCE) { |
| /* This is a hack. Force the timer to be reloaded |
| when the reference clock is changed. */ |
| systick_reload(s, 1); |
| } |
| break; |
| case 0x14: /* SysTick Reload Value. */ |
| s->systick.reload = value; |
| break; |
| case 0x18: /* SysTick Current Value. Writes reload the timer. */ |
| systick_reload(s, 1); |
| s->systick.control &= ~SYSTICK_COUNTFLAG; |
| break; |
| case 0xd04: /* Interrupt Control State. */ |
| if (value & (1 << 31)) { |
| armv7m_nvic_set_pending(s, ARMV7M_EXCP_NMI); |
| } |
| if (value & (1 << 28)) { |
| armv7m_nvic_set_pending(s, ARMV7M_EXCP_PENDSV); |
| } else if (value & (1 << 27)) { |
| s->gic.irq_state[ARMV7M_EXCP_PENDSV].pending = 0; |
| gic_update(&s->gic); |
| } |
| if (value & (1 << 26)) { |
| armv7m_nvic_set_pending(s, ARMV7M_EXCP_SYSTICK); |
| } else if (value & (1 << 25)) { |
| s->gic.irq_state[ARMV7M_EXCP_SYSTICK].pending = 0; |
| gic_update(&s->gic); |
| } |
| break; |
| case 0xd08: /* Vector Table Offset. */ |
| cpu_single_env->v7m.vecbase = value & 0xffffff80; |
| break; |
| case 0xd0c: /* Application Interrupt/Reset Control. */ |
| if ((value >> 16) == 0x05fa) { |
| if (value & 2) { |
| hw_error("VECTCLRACTIVE not implemented"); |
| } |
| if (value & 5) { |
| hw_error("System reset"); |
| } |
| } |
| break; |
| case 0xd10: /* System Control. */ |
| case 0xd14: /* Configuration Control. */ |
| /* TODO: Implement control registers. */ |
| goto bad_reg; |
| case 0xd18: case 0xd1c: case 0xd20: /* System Handler Priority. */ |
| { |
| int irq; |
| irq = offset - 0xd14; |
| s->gic.priority1[irq++][0] = value & 0xff; |
| s->gic.priority1[irq++][0] = (value >> 8) & 0xff; |
| s->gic.priority1[irq++][0] = (value >> 16) & 0xff; |
| s->gic.priority1[irq][0] = (value >> 24) & 0xff; |
| gic_update(&s->gic); |
| } |
| break; |
| case 0xd24: /* System Handler Control. */ |
| /* TODO: Real hardware allows you to set/clear the active bits |
| under some circumstances. We don't implement this. */ |
| s->gic.irq_state[ARMV7M_EXCP_MEM].enabled = (value & (1 << 16)) != 0; |
| s->gic.irq_state[ARMV7M_EXCP_BUS].enabled = (value & (1 << 17)) != 0; |
| s->gic.irq_state[ARMV7M_EXCP_USAGE].enabled = (value & (1 << 18)) != 0; |
| break; |
| case 0xd28: /* Configurable Fault Status. */ |
| case 0xd2c: /* Hard Fault Status. */ |
| case 0xd30: /* Debug Fault Status. */ |
| case 0xd34: /* Mem Manage Address. */ |
| case 0xd38: /* Bus Fault Address. */ |
| case 0xd3c: /* Aux Fault Status. */ |
| goto bad_reg; |
| default: |
| bad_reg: |
| hw_error("NVIC: Bad write offset 0x%x\n", offset); |
| } |
| } |
| |
| static const VMStateDescription vmstate_nvic = { |
| .name = "armv7m_nvic", |
| .version_id = 1, |
| .minimum_version_id = 1, |
| .minimum_version_id_old = 1, |
| .fields = (VMStateField[]) { |
| VMSTATE_UINT32(systick.control, nvic_state), |
| VMSTATE_UINT32(systick.reload, nvic_state), |
| VMSTATE_INT64(systick.tick, nvic_state), |
| VMSTATE_TIMER(systick.timer, nvic_state), |
| VMSTATE_END_OF_LIST() |
| } |
| }; |
| |
| static int armv7m_nvic_init(SysBusDevice *dev) |
| { |
| nvic_state *s= FROM_SYSBUSGIC(nvic_state, dev); |
| |
| gic_init(&s->gic); |
| cpu_register_physical_memory(0xe000e000, 0x1000, s->gic.iomemtype); |
| s->systick.timer = qemu_new_timer_ns(vm_clock, systick_timer_tick, s); |
| vmstate_register(&dev->qdev, -1, &vmstate_nvic, s); |
| return 0; |
| } |
| |
| static void armv7m_nvic_register_devices(void) |
| { |
| sysbus_register_dev("armv7m_nvic", sizeof(nvic_state), armv7m_nvic_init); |
| } |
| |
| device_init(armv7m_nvic_register_devices) |
