diff options
Diffstat (limited to 'hw/pl190.c')
| -rw-r--r-- | hw/pl190.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/hw/pl190.c b/hw/pl190.c new file mode 100644 index 0000000..55c7180 --- /dev/null +++ b/hw/pl190.c @@ -0,0 +1,252 @@ +/* + * Arm PrimeCell PL190 Vector Interrupt Controller + * + * Copyright (c) 2006 CodeSourcery. + * Written by Paul Brook + * + * This code is licenced under the GPL. + */ + +#include "vl.h" +#include "arm_pic.h" + +/* The number of virtual priority levels. 16 user vectors plus the + unvectored IRQ. Chained interrupts would require an additional level + if implemented. */ + +#define PL190_NUM_PRIO 17 + +typedef struct { + arm_pic_handler handler; + uint32_t base; + DisplayState *ds; + uint32_t level; + uint32_t soft_level; + uint32_t irq_enable; + uint32_t fiq_select; + uint32_t default_addr; + uint8_t vect_control[16]; + uint32_t vect_addr[PL190_NUM_PRIO]; + /* Mask containing interrupts with higher priority than this one. */ + uint32_t prio_mask[PL190_NUM_PRIO + 1]; + int protected; + /* Current priority level. */ + int priority; + int prev_prio[PL190_NUM_PRIO]; + void *parent; + int irq; + int fiq; +} pl190_state; + +static const unsigned char pl190_id[] = +{ 0x90, 0x11, 0x04, 0x00, 0x0D, 0xf0, 0x05, 0xb1 }; + +static inline uint32_t pl190_irq_level(pl190_state *s) +{ + return (s->level | s->soft_level) & s->irq_enable & ~s->fiq_select; +} + +/* Update interrupts. */ +static void pl190_update(pl190_state *s) +{ + uint32_t level = pl190_irq_level(s); + int set; + + set = (level & s->prio_mask[s->priority]) != 0; + pic_set_irq_new(s->parent, s->irq, set); + set = ((s->level | s->soft_level) & s->fiq_select) != 0; + pic_set_irq_new(s->parent, s->fiq, set); +} + +static void pl190_set_irq(void *opaque, int irq, int level) +{ + pl190_state *s = (pl190_state *)opaque; + + if (level) + s->level |= 1u << irq; + else + s->level &= ~(1u << irq); + pl190_update(s); +} + +static void pl190_update_vectors(pl190_state *s) +{ + uint32_t mask; + int i; + int n; + + mask = 0; + for (i = 0; i < 16; i++) + { + s->prio_mask[i] = mask; + if (s->vect_control[i] & 0x20) + { + n = s->vect_control[i] & 0x1f; + mask |= 1 << n; + } + } + s->prio_mask[16] = mask; + pl190_update(s); +} + +static uint32_t pl190_read(void *opaque, target_phys_addr_t offset) +{ + pl190_state *s = (pl190_state *)opaque; + int i; + + offset -= s->base; + if (offset >= 0xfe0 && offset < 0x1000) { + return pl190_id[(offset - 0xfe0) >> 2]; + } + if (offset >= 0x100 && offset < 0x140) { + return s->vect_addr[(offset - 0x100) >> 2]; + } + if (offset >= 0x200 && offset < 0x240) { + return s->vect_control[(offset - 0x200) >> 2]; + } + switch (offset >> 2) { + case 0: /* IRQSTATUS */ + return pl190_irq_level(s); + case 1: /* FIQSATUS */ + return (s->level | s->soft_level) & s->fiq_select; + case 2: /* RAWINTR */ + return s->level | s->soft_level; + case 3: /* INTSELECT */ + return s->fiq_select; + case 4: /* INTENABLE */ + return s->irq_enable; + case 6: /* SOFTINT */ + return s->soft_level; + case 8: /* PROTECTION */ + return s->protected; + case 12: /* VECTADDR */ + /* Read vector address at the start of an ISR. Increases the + current priority level to that of the current interrupt. */ + for (i = 0; i < s->priority; i++) + { + if ((s->level | s->soft_level) & s->prio_mask[i]) + break; + } + /* Reading this value with no pending interrupts is undefined. + We return the default address. */ + if (i == PL190_NUM_PRIO) + return s->vect_addr[16]; + if (i < s->priority) + { + s->prev_prio[i] = s->priority; + s->priority = i; + pl190_update(s); + } + return s->vect_addr[s->priority]; + case 13: /* DEFVECTADDR */ + return s->vect_addr[16]; + default: + cpu_abort (cpu_single_env, "pl190_read: Bad offset %x\n", offset); + return 0; + } +} + +static void pl190_write(void *opaque, target_phys_addr_t offset, uint32_t val) +{ + pl190_state *s = (pl190_state *)opaque; + + offset -= s->base; + if (offset >= 0x100 && offset < 0x140) { + s->vect_addr[(offset - 0x100) >> 2] = val; + pl190_update_vectors(s); + return; + } + if (offset >= 0x200 && offset < 0x240) { + s->vect_control[(offset - 0x200) >> 2] = val; + pl190_update_vectors(s); + return; + } + switch (offset >> 2) { + case 0: /* SELECT */ + /* This is a readonly register, but linux tries to write to it + anyway. Ignore the write. */ + break; + case 3: /* INTSELECT */ + s->fiq_select = val; + break; + case 4: /* INTENABLE */ + s->irq_enable |= val; + break; + case 5: /* INTENCLEAR */ + s->irq_enable &= ~val; + break; + case 6: /* SOFTINT */ + s->soft_level |= val; + break; + case 7: /* SOFTINTCLEAR */ + s->soft_level &= ~val; + break; + case 8: /* PROTECTION */ + /* TODO: Protection (supervisor only access) is not implemented. */ + s->protected = val & 1; + break; + case 12: /* VECTADDR */ + /* Restore the previous priority level. The value written is + ignored. */ + if (s->priority < PL190_NUM_PRIO) + s->priority = s->prev_prio[s->priority]; + break; + case 13: /* DEFVECTADDR */ + s->default_addr = val; + break; + case 0xc0: /* ITCR */ + if (val) + cpu_abort(cpu_single_env, "pl190: Test mode not implemented\n"); + break; + default: + cpu_abort(cpu_single_env, "pl190_write: Bad offset %x\n", offset); + return; + } + pl190_update(s); +} + +static CPUReadMemoryFunc *pl190_readfn[] = { + pl190_read, + pl190_read, + pl190_read +}; + +static CPUWriteMemoryFunc *pl190_writefn[] = { + pl190_write, + pl190_write, + pl190_write +}; + +void pl190_reset(pl190_state *s) +{ + int i; + + for (i = 0; i < 16; i++) + { + s->vect_addr[i] = 0; + s->vect_control[i] = 0; + } + s->vect_addr[16] = 0; + s->prio_mask[17] = 0xffffffff; + s->priority = PL190_NUM_PRIO; + pl190_update_vectors(s); +} + +void *pl190_init(uint32_t base, void *parent, int irq, int fiq) +{ + pl190_state *s; + int iomemtype; + + s = (pl190_state *)qemu_mallocz(sizeof(pl190_state)); + iomemtype = cpu_register_io_memory(0, pl190_readfn, + pl190_writefn, s); + cpu_register_physical_memory(base, 0x00000fff, iomemtype); + s->handler = pl190_set_irq; + s->base = base; + s->parent = parent; + s->irq = irq; + s->fiq = fiq; + pl190_reset(s); + /* ??? Save/restore. */ + return s; +} |