root / hw / pl061.c @ 9596ebb7
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/*
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* Arm PrimeCell PL061 General Purpose IO with additional
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* Luminary Micro Stellaris bits.
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*
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* Copyright (c) 2007 CodeSourcery.
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* Written by Paul Brook
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*
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* This code is licenced under the GPL.
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*/
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#include "hw.h" |
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#include "primecell.h" |
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//#define DEBUG_PL061 1
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#ifdef DEBUG_PL061
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#define DPRINTF(fmt, args...) \
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do { printf("pl061: " fmt , ##args); } while (0) |
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#define BADF(fmt, args...) \
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do { fprintf(stderr, "pl061: error: " fmt , ##args); exit(1);} while (0) |
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#else
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#define DPRINTF(fmt, args...) do {} while(0) |
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#define BADF(fmt, args...) \
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do { fprintf(stderr, "pl061: error: " fmt , ##args);} while (0) |
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#endif
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static const uint8_t pl061_id[12] = |
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{ 0x00, 0x00, 0x00, 0x00, 0x61, 0x00, 0x18, 0x01, 0x0d, 0xf0, 0x05, 0xb1 }; |
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typedef struct { |
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uint32_t base; |
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int locked;
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uint8_t data; |
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uint8_t old_data; |
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uint8_t dir; |
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uint8_t isense; |
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uint8_t ibe; |
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uint8_t iev; |
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uint8_t im; |
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uint8_t istate; |
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uint8_t afsel; |
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uint8_t dr2r; |
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uint8_t dr4r; |
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uint8_t dr8r; |
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uint8_t odr; |
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uint8_t pur; |
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uint8_t pdr; |
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uint8_t slr; |
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uint8_t den; |
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uint8_t cr; |
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qemu_irq irq; |
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qemu_irq out[8];
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} pl061_state; |
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static void pl061_update(pl061_state *s) |
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{ |
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uint8_t changed; |
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uint8_t mask; |
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int i;
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changed = s->old_data ^ s->data; |
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if (!changed)
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return;
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s->old_data = s->data; |
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for (i = 0; i < 8; i++) { |
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mask = 1 << i;
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if ((changed & mask & s->dir) && s->out) {
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DPRINTF("Set output %d = %d\n", i, (s->data & mask) != 0); |
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qemu_set_irq(s->out[i], (s->data & mask) != 0);
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} |
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} |
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/* FIXME: Implement input interrupts. */
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} |
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static uint32_t pl061_read(void *opaque, target_phys_addr_t offset) |
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{ |
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pl061_state *s = (pl061_state *)opaque; |
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offset -= s->base; |
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if (offset >= 0xfd0 && offset < 0x1000) { |
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return pl061_id[(offset - 0xfd0) >> 2]; |
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} |
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if (offset < 0x400) { |
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return s->data & (offset >> 2); |
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} |
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switch (offset) {
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case 0x400: /* Direction */ |
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return s->dir;
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case 0x404: /* Interrupt sense */ |
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return s->isense;
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case 0x408: /* Interrupt both edges */ |
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return s->ibe;
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case 0x40c: /* Interupt event */ |
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return s->iev;
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case 0x410: /* Interrupt mask */ |
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return s->im;
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case 0x414: /* Raw interrupt status */ |
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return s->istate;
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case 0x418: /* Masked interrupt status */ |
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return s->istate | s->im;
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case 0x420: /* Alternate function select */ |
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return s->afsel;
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case 0x500: /* 2mA drive */ |
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return s->dr2r;
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case 0x504: /* 4mA drive */ |
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return s->dr4r;
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case 0x508: /* 8mA drive */ |
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return s->dr8r;
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case 0x50c: /* Open drain */ |
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return s->odr;
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case 0x510: /* Pull-up */ |
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return s->pur;
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case 0x514: /* Pull-down */ |
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return s->pdr;
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case 0x518: /* Slew rate control */ |
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return s->slr;
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case 0x51c: /* Digital enable */ |
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return s->den;
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case 0x520: /* Lock */ |
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return s->locked;
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case 0x524: /* Commit */ |
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return s->cr;
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default:
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cpu_abort (cpu_single_env, "pl061_read: Bad offset %x\n",
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(int)offset);
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return 0; |
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} |
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} |
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static void pl061_write(void *opaque, target_phys_addr_t offset, |
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uint32_t value) |
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{ |
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pl061_state *s = (pl061_state *)opaque; |
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uint8_t mask; |
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offset -= s->base; |
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if (offset < 0x400) { |
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mask = (offset >> 2) & s->dir;
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s->data = (s->data & ~mask) | (value & mask); |
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pl061_update(s); |
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return;
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} |
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switch (offset) {
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case 0x400: /* Direction */ |
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s->dir = value; |
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break;
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case 0x404: /* Interrupt sense */ |
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s->isense = value; |
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break;
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case 0x408: /* Interrupt both edges */ |
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s->ibe = value; |
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break;
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case 0x40c: /* Interupt event */ |
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s->iev = value; |
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break;
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case 0x410: /* Interrupt mask */ |
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s->im = value; |
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break;
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case 0x41c: /* Interrupt clear */ |
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s->istate &= ~value; |
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break;
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case 0x420: /* Alternate function select */ |
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mask = s->cr; |
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s->afsel = (s->afsel & ~mask) | (value & mask); |
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break;
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case 0x500: /* 2mA drive */ |
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s->dr2r = value; |
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break;
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case 0x504: /* 4mA drive */ |
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s->dr4r = value; |
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break;
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case 0x508: /* 8mA drive */ |
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s->dr8r = value; |
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break;
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case 0x50c: /* Open drain */ |
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s->odr = value; |
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break;
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case 0x510: /* Pull-up */ |
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s->pur = value; |
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break;
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case 0x514: /* Pull-down */ |
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s->pdr = value; |
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break;
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case 0x518: /* Slew rate control */ |
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s->slr = value; |
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break;
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case 0x51c: /* Digital enable */ |
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s->den = value; |
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break;
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case 0x520: /* Lock */ |
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s->locked = (value != 0xacce551);
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break;
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case 0x524: /* Commit */ |
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if (!s->locked)
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s->cr = value; |
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break;
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default:
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cpu_abort (cpu_single_env, "pl061_write: Bad offset %x\n",
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(int)offset);
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} |
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pl061_update(s); |
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} |
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static void pl061_reset(pl061_state *s) |
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{ |
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s->locked = 1;
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s->cr = 0xff;
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} |
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static void pl061_set_irq(void * opaque, int irq, int level) |
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{ |
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pl061_state *s = (pl061_state *)opaque; |
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uint8_t mask; |
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mask = 1 << irq;
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if ((s->dir & mask) == 0) { |
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s->data &= ~mask; |
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if (level)
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s->data |= mask; |
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pl061_update(s); |
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} |
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} |
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static CPUReadMemoryFunc *pl061_readfn[] = {
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pl061_read, |
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pl061_read, |
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pl061_read |
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}; |
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static CPUWriteMemoryFunc *pl061_writefn[] = {
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pl061_write, |
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pl061_write, |
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pl061_write |
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}; |
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/* Returns an array of inputs. */
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qemu_irq *pl061_init(uint32_t base, qemu_irq irq, qemu_irq **out) |
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{ |
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int iomemtype;
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pl061_state *s; |
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s = (pl061_state *)qemu_mallocz(sizeof(pl061_state));
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iomemtype = cpu_register_io_memory(0, pl061_readfn,
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pl061_writefn, s); |
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cpu_register_physical_memory(base, 0x00001000, iomemtype);
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s->base = base; |
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s->irq = irq; |
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pl061_reset(s); |
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if (out)
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*out = s->out; |
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/* ??? Save/restore. */
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return qemu_allocate_irqs(pl061_set_irq, s, 8); |
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} |
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