263 lines
6.2 KiB
C
263 lines
6.2 KiB
C
/*
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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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uint8_t float_high;
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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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uint8_t out;
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int i;
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/* Outputs float high. */
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/* FIXME: This is board dependent. */
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out = (s->data & s->dir) | ~s->dir;
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changed = s->old_data ^ out;
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if (!changed)
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return;
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s->old_data = out;
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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->out) {
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DPRINTF("Set output %d = %d\n", i, (out & mask) != 0);
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qemu_set_irq(s->out[i], (out & 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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