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authorpbrook <pbrook@c046a42c-6fe2-441c-8c8c-71466251a162>2006-09-23 17:40:58 +0000
committerpbrook <pbrook@c046a42c-6fe2-441c-8c8c-71466251a162>2006-09-23 17:40:58 +0000
commite69954b9fc698996c8416a2fb26c6b50ad9f49a9 (patch)
tree5ac6f865266efe1345a4b7f737706eaf1c0ac1c7 /hw/arm_gic.c
parent37dd208d38ab9f65f9e15fd7fe2f0b75bc83220a (diff)
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Add ARM RealView Emulation Baseboard.
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2164 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'hw/arm_gic.c')
-rw-r--r--hw/arm_gic.c544
1 files changed, 544 insertions, 0 deletions
diff --git a/hw/arm_gic.c b/hw/arm_gic.c
new file mode 100644
index 0000000..c7cc380
--- /dev/null
+++ b/hw/arm_gic.c
@@ -0,0 +1,544 @@
+/*
+ * ARM AMBA Generic/Distributed Interrupt Controller
+ *
+ * Copyright (c) 2006 CodeSourcery.
+ * Written by Paul Brook
+ *
+ * This code is licenced under the GPL.
+ */
+
+/* TODO: Some variants of this controller can handle multiple CPUs.
+ Currently only single CPU operation is implemented. */
+
+#include "vl.h"
+#include "arm_pic.h"
+
+//#define DEBUG_GIC
+
+#ifdef DEBUG_GIC
+#define DPRINTF(fmt, args...) \
+do { printf("arm_gic: " fmt , (int)s->base, ##args); } while (0)
+#else
+#define DPRINTF(fmt, args...) do {} while(0)
+#endif
+
+/* Distributed interrupt controller. */
+
+static const uint8_t gic_id[] =
+{ 0x90, 0x13, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 };
+
+#define GIC_NIRQ 96
+
+typedef struct gic_irq_state
+{
+ unsigned enabled:1;
+ unsigned pending:1;
+ unsigned active:1;
+ unsigned level:1;
+ unsigned model:1; /* 0 = 1:N, 1 = N:N */
+ unsigned trigger:1; /* nonzero = edge triggered. */
+} gic_irq_state;
+
+#define GIC_SET_ENABLED(irq) s->irq_state[irq].enabled = 1
+#define GIC_CLEAR_ENABLED(irq) s->irq_state[irq].enabled = 0
+#define GIC_TEST_ENABLED(irq) s->irq_state[irq].enabled
+#define GIC_SET_PENDING(irq) s->irq_state[irq].pending = 1
+#define GIC_CLEAR_PENDING(irq) s->irq_state[irq].pending = 0
+#define GIC_TEST_PENDING(irq) s->irq_state[irq].pending
+#define GIC_SET_ACTIVE(irq) s->irq_state[irq].active = 1
+#define GIC_CLEAR_ACTIVE(irq) s->irq_state[irq].active = 0
+#define GIC_TEST_ACTIVE(irq) s->irq_state[irq].active
+#define GIC_SET_MODEL(irq) s->irq_state[irq].model = 1
+#define GIC_CLEAR_MODEL(irq) s->irq_state[irq].model = 0
+#define GIC_TEST_MODEL(irq) s->irq_state[irq].model
+#define GIC_SET_LEVEL(irq) s->irq_state[irq].level = 1
+#define GIC_CLEAR_LEVEL(irq) s->irq_state[irq].level = 0
+#define GIC_TEST_LEVEL(irq) s->irq_state[irq].level
+#define GIC_SET_TRIGGER(irq) s->irq_state[irq].trigger = 1
+#define GIC_CLEAR_TRIGGER(irq) s->irq_state[irq].trigger = 0
+#define GIC_TEST_TRIGGER(irq) s->irq_state[irq].trigger
+
+typedef struct gic_state
+{
+ arm_pic_handler handler;
+ uint32_t base;
+ void *parent;
+ int parent_irq;
+ int enabled;
+ int cpu_enabled;
+
+ gic_irq_state irq_state[GIC_NIRQ];
+ int irq_target[GIC_NIRQ];
+ int priority[GIC_NIRQ];
+ int last_active[GIC_NIRQ];
+
+ int priority_mask;
+ int running_irq;
+ int running_priority;
+ int current_pending;
+} gic_state;
+
+/* TODO: Many places that call this routine could be optimized. */
+/* Update interrupt status after enabled or pending bits have been changed. */
+static void gic_update(gic_state *s)
+{
+ int best_irq;
+ int best_prio;
+ int irq;
+
+ s->current_pending = 1023;
+ if (!s->enabled || !s->cpu_enabled) {
+ pic_set_irq_new(s->parent, s->parent_irq, 0);
+ return;
+ }
+ best_prio = 0x100;
+ best_irq = 1023;
+ for (irq = 0; irq < 96; irq++) {
+ if (GIC_TEST_ENABLED(irq) && GIC_TEST_PENDING(irq)) {
+ if (s->priority[irq] < best_prio) {
+ best_prio = s->priority[irq];
+ best_irq = irq;
+ }
+ }
+ }
+ if (best_prio > s->priority_mask) {
+ pic_set_irq_new(s->parent, s->parent_irq, 0);
+ } else {
+ s->current_pending = best_irq;
+ if (best_prio < s->running_priority) {
+ DPRINTF("Raised pending IRQ %d\n", best_irq);
+ pic_set_irq_new(s->parent, s->parent_irq, 1);
+ }
+ }
+}
+
+static void gic_set_irq(void *opaque, int irq, int level)
+{
+ gic_state *s = (gic_state *)opaque;
+ /* The first external input line is internal interrupt 32. */
+ irq += 32;
+ if (level == GIC_TEST_LEVEL(irq))
+ return;
+
+ if (level) {
+ GIC_SET_LEVEL(irq);
+ if (GIC_TEST_TRIGGER(irq) || GIC_TEST_ENABLED(irq)) {
+ DPRINTF("Set %d pending\n", irq);
+ GIC_SET_PENDING(irq);
+ }
+ } else {
+ GIC_CLEAR_LEVEL(irq);
+ }
+ gic_update(s);
+}
+
+static void gic_set_running_irq(gic_state *s, int irq)
+{
+ s->running_irq = irq;
+ s->running_priority = s->priority[irq];
+ gic_update(s);
+}
+
+static uint32_t gic_acknowledge_irq(gic_state *s)
+{
+ int new_irq;
+ new_irq = s->current_pending;
+ if (new_irq == 1023 || s->priority[new_irq] >= s->running_priority) {
+ DPRINTF("ACK no pending IRQ\n");
+ return 1023;
+ }
+ pic_set_irq_new(s->parent, s->parent_irq, 0);
+ s->last_active[new_irq] = s->running_irq;
+ /* For level triggered interrupts we clear the pending bit while
+ the interrupt is active. */
+ GIC_CLEAR_PENDING(new_irq);
+ gic_set_running_irq(s, new_irq);
+ DPRINTF("ACK %d\n", new_irq);
+ return new_irq;
+}
+
+static void gic_complete_irq(gic_state * s, int irq)
+{
+ int update = 0;
+ DPRINTF("EIO %d\n", irq);
+ if (s->running_irq == 1023)
+ return; /* No active IRQ. */
+ if (irq != 1023) {
+ /* Mark level triggered interrupts as pending if they are still
+ raised. */
+ if (!GIC_TEST_TRIGGER(irq) && GIC_TEST_ENABLED(irq)
+ && GIC_TEST_LEVEL(irq)) {
+ GIC_SET_PENDING(irq);
+ update = 1;
+ }
+ }
+ if (irq != s->running_irq) {
+ /* Complete an IRQ that is not currently running. */
+ int tmp = s->running_irq;
+ while (s->last_active[tmp] != 1023) {
+ if (s->last_active[tmp] == irq) {
+ s->last_active[tmp] = s->last_active[irq];
+ break;
+ }
+ tmp = s->last_active[tmp];
+ }
+ if (update) {
+ gic_update(s);
+ }
+ } else {
+ /* Complete the current running IRQ. */
+ gic_set_running_irq(s, s->last_active[s->running_irq]);
+ }
+}
+
+static uint32_t gic_dist_readb(void *opaque, target_phys_addr_t offset)
+{
+ gic_state *s = (gic_state *)opaque;
+ uint32_t res;
+ int irq;
+ int i;
+
+ offset -= s->base + 0x1000;
+ if (offset < 0x100) {
+ if (offset == 0)
+ return s->enabled;
+ if (offset == 4)
+ return (GIC_NIRQ / 32) - 1;
+ if (offset < 0x08)
+ return 0;
+ goto bad_reg;
+ } else if (offset < 0x200) {
+ /* Interrupt Set/Clear Enable. */
+ if (offset < 0x180)
+ irq = (offset - 0x100) * 8;
+ else
+ irq = (offset - 0x180) * 8;
+ if (irq >= GIC_NIRQ)
+ goto bad_reg;
+ res = 0;
+ for (i = 0; i < 8; i++) {
+ if (GIC_TEST_ENABLED(irq + i)) {
+ res |= (1 << i);
+ }
+ }
+ } else if (offset < 0x300) {
+ /* Interrupt Set/Clear Pending. */
+ if (offset < 0x280)
+ irq = (offset - 0x200) * 8;
+ else
+ irq = (offset - 0x280) * 8;
+ if (irq >= GIC_NIRQ)
+ goto bad_reg;
+ res = 0;
+ for (i = 0; i < 8; i++) {
+ if (GIC_TEST_PENDING(irq + i)) {
+ res |= (1 << i);
+ }
+ }
+ } else if (offset < 0x400) {
+ /* Interrupt Active. */
+ irq = (offset - 0x300) * 8;
+ if (irq >= GIC_NIRQ)
+ goto bad_reg;
+ res = 0;
+ for (i = 0; i < 8; i++) {
+ if (GIC_TEST_ACTIVE(irq + i)) {
+ res |= (1 << i);
+ }
+ }
+ } else if (offset < 0x800) {
+ /* Interrupt Priority. */
+ irq = offset - 0x400;
+ if (irq >= GIC_NIRQ)
+ goto bad_reg;
+ res = s->priority[irq];
+ } else if (offset < 0xc00) {
+ /* Interrupt CPU Target. */
+ irq = offset - 0x800;
+ if (irq >= GIC_NIRQ)
+ goto bad_reg;
+ res = s->irq_target[irq];
+ } else if (offset < 0xf00) {
+ /* Interrupt Configuration. */
+ irq = (offset - 0xc00) * 2;
+ if (irq >= GIC_NIRQ)
+ goto bad_reg;
+ res = 0;
+ for (i = 0; i < 4; i++) {
+ if (GIC_TEST_MODEL(irq + i))
+ res |= (1 << (i * 2));
+ if (GIC_TEST_TRIGGER(irq + i))
+ res |= (2 << (i * 2));
+ }
+ } else if (offset < 0xfe0) {
+ goto bad_reg;
+ } else /* offset >= 0xfe0 */ {
+ if (offset & 3) {
+ res = 0;
+ } else {
+ res = gic_id[(offset - 0xfe0) >> 2];
+ }
+ }
+ return res;
+bad_reg:
+ cpu_abort (cpu_single_env, "gic_dist_readb: Bad offset %x\n", offset);
+ return 0;
+}
+
+static uint32_t gic_dist_readw(void *opaque, target_phys_addr_t offset)
+{
+ uint32_t val;
+ val = gic_dist_readb(opaque, offset);
+ val |= gic_dist_readb(opaque, offset + 1) << 8;
+ return val;
+}
+
+static uint32_t gic_dist_readl(void *opaque, target_phys_addr_t offset)
+{
+ uint32_t val;
+ val = gic_dist_readw(opaque, offset);
+ val |= gic_dist_readw(opaque, offset + 2) << 16;
+ return val;
+}
+
+static void gic_dist_writeb(void *opaque, target_phys_addr_t offset,
+ uint32_t value)
+{
+ gic_state *s = (gic_state *)opaque;
+ int irq;
+ int i;
+
+ offset -= s->base + 0x1000;
+ if (offset < 0x100) {
+ if (offset == 0) {
+ s->enabled = (value & 1);
+ DPRINTF("Distribution %sabled\n", s->enabled ? "En" : "Dis");
+ } else if (offset < 4) {
+ /* ignored. */
+ } else {
+ goto bad_reg;
+ }
+ } else if (offset < 0x180) {
+ /* Interrupt Set Enable. */
+ irq = (offset - 0x100) * 8;
+ if (irq >= GIC_NIRQ)
+ goto bad_reg;
+ for (i = 0; i < 8; i++) {
+ if (value & (1 << i)) {
+ if (!GIC_TEST_ENABLED(irq + i))
+ DPRINTF("Enabled IRQ %d\n", irq + i);
+ GIC_SET_ENABLED(irq + i);
+ /* If a raised level triggered IRQ enabled then mark
+ is as pending. */
+ if (GIC_TEST_LEVEL(irq + i) && !GIC_TEST_TRIGGER(irq + i))
+ GIC_SET_PENDING(irq + i);
+ }
+ }
+ } else if (offset < 0x200) {
+ /* Interrupt Clear Enable. */
+ irq = (offset - 0x180) * 8;
+ if (irq >= GIC_NIRQ)
+ goto bad_reg;
+ for (i = 0; i < 8; i++) {
+ if (value & (1 << i)) {
+ if (GIC_TEST_ENABLED(irq + i))
+ DPRINTF("Disabled IRQ %d\n", irq + i);
+ GIC_CLEAR_ENABLED(irq + i);
+ }
+ }
+ } else if (offset < 0x280) {
+ /* Interrupt Set Pending. */
+ irq = (offset - 0x200) * 8;
+ if (irq >= GIC_NIRQ)
+ goto bad_reg;
+ for (i = 0; i < 8; i++) {
+ if (value & (1 << i)) {
+ GIC_SET_PENDING(irq + i);
+ }
+ }
+ } else if (offset < 0x300) {
+ /* Interrupt Clear Pending. */
+ irq = (offset - 0x280) * 8;
+ if (irq >= GIC_NIRQ)
+ goto bad_reg;
+ for (i = 0; i < 8; i++) {
+ if (value & (1 << i)) {
+ GIC_CLEAR_PENDING(irq + i);
+ }
+ }
+ } else if (offset < 0x400) {
+ /* Interrupt Active. */
+ goto bad_reg;
+ } else if (offset < 0x800) {
+ /* Interrupt Priority. */
+ irq = offset - 0x400;
+ if (irq >= GIC_NIRQ)
+ goto bad_reg;
+ s->priority[irq] = value;
+ } else if (offset < 0xc00) {
+ /* Interrupt CPU Target. */
+ irq = offset - 0x800;
+ if (irq >= GIC_NIRQ)
+ goto bad_reg;
+ s->irq_target[irq] = value;
+ } else if (offset < 0xf00) {
+ /* Interrupt Configuration. */
+ irq = (offset - 0xc00) * 2;
+ if (irq >= GIC_NIRQ)
+ goto bad_reg;
+ for (i = 0; i < 4; i++) {
+ if (value & (1 << (i * 2))) {
+ GIC_SET_MODEL(irq + i);
+ } else {
+ GIC_CLEAR_MODEL(irq + i);
+ }
+ if (value & (2 << (i * 2))) {
+ GIC_SET_TRIGGER(irq + i);
+ } else {
+ GIC_CLEAR_TRIGGER(irq + i);
+ }
+ }
+ } else {
+ /* 0xf00 is only handled for word writes. */
+ goto bad_reg;
+ }
+ gic_update(s);
+ return;
+bad_reg:
+ cpu_abort (cpu_single_env, "gic_dist_writeb: Bad offset %x\n", offset);
+}
+
+static void gic_dist_writew(void *opaque, target_phys_addr_t offset,
+ uint32_t value)
+{
+ gic_state *s = (gic_state *)opaque;
+ if (offset - s->base == 0xf00) {
+ GIC_SET_PENDING(value & 0x3ff);
+ gic_update(s);
+ return;
+ }
+ gic_dist_writeb(opaque, offset, value & 0xff);
+ gic_dist_writeb(opaque, offset + 1, value >> 8);
+}
+
+static void gic_dist_writel(void *opaque, target_phys_addr_t offset,
+ uint32_t value)
+{
+ gic_dist_writew(opaque, offset, value & 0xffff);
+ gic_dist_writew(opaque, offset + 2, value >> 16);
+}
+
+static CPUReadMemoryFunc *gic_dist_readfn[] = {
+ gic_dist_readb,
+ gic_dist_readw,
+ gic_dist_readl
+};
+
+static CPUWriteMemoryFunc *gic_dist_writefn[] = {
+ gic_dist_writeb,
+ gic_dist_writew,
+ gic_dist_writel
+};
+
+static uint32_t gic_cpu_read(void *opaque, target_phys_addr_t offset)
+{
+ gic_state *s = (gic_state *)opaque;
+ offset -= s->base;
+ switch (offset) {
+ case 0x00: /* Control */
+ return s->cpu_enabled;
+ case 0x04: /* Priority mask */
+ return s->priority_mask;
+ case 0x08: /* Binary Point */
+ /* ??? Not implemented. */
+ return 0;
+ case 0x0c: /* Acknowledge */
+ return gic_acknowledge_irq(s);
+ case 0x14: /* Runing Priority */
+ return s->running_priority;
+ case 0x18: /* Highest Pending Interrupt */
+ return s->current_pending;
+ default:
+ cpu_abort (cpu_single_env, "gic_cpu_writeb: Bad offset %x\n", offset);
+ return 0;
+ }
+}
+
+static void gic_cpu_write(void *opaque, target_phys_addr_t offset,
+ uint32_t value)
+{
+ gic_state *s = (gic_state *)opaque;
+ offset -= s->base;
+ switch (offset) {
+ case 0x00: /* Control */
+ s->cpu_enabled = (value & 1);
+ DPRINTF("CPU %sabled\n", s->cpu_enabled ? "En" : "Dis");
+ break;
+ case 0x04: /* Priority mask */
+ s->priority_mask = (value & 0x3ff);
+ break;
+ case 0x08: /* Binary Point */
+ /* ??? Not implemented. */
+ break;
+ case 0x10: /* End Of Interrupt */
+ return gic_complete_irq(s, value & 0x3ff);
+ default:
+ cpu_abort (cpu_single_env, "gic_cpu_writeb: Bad offset %x\n", offset);
+ return;
+ }
+ gic_update(s);
+}
+
+static CPUReadMemoryFunc *gic_cpu_readfn[] = {
+ gic_cpu_read,
+ gic_cpu_read,
+ gic_cpu_read
+};
+
+static CPUWriteMemoryFunc *gic_cpu_writefn[] = {
+ gic_cpu_write,
+ gic_cpu_write,
+ gic_cpu_write
+};
+
+static void gic_reset(gic_state *s)
+{
+ int i;
+ memset(s->irq_state, 0, GIC_NIRQ * sizeof(gic_irq_state));
+ s->priority_mask = 0xf0;
+ s->current_pending = 1023;
+ s->running_irq = 1023;
+ s->running_priority = 0x100;
+ for (i = 0; i < 15; i++) {
+ GIC_SET_ENABLED(i);
+ GIC_SET_TRIGGER(i);
+ }
+ s->enabled = 0;
+ s->cpu_enabled = 0;
+}
+
+void *arm_gic_init(uint32_t base, void *parent, int parent_irq)
+{
+ gic_state *s;
+ int iomemtype;
+
+ s = (gic_state *)qemu_mallocz(sizeof(gic_state));
+ if (!s)
+ return NULL;
+ s->handler = gic_set_irq;
+ s->parent = parent;
+ s->parent_irq = parent_irq;
+ if (base != 0xffffffff) {
+ iomemtype = cpu_register_io_memory(0, gic_cpu_readfn,
+ gic_cpu_writefn, s);
+ cpu_register_physical_memory(base, 0x00000fff, iomemtype);
+ iomemtype = cpu_register_io_memory(0, gic_dist_readfn,
+ gic_dist_writefn, s);
+ cpu_register_physical_memory(base + 0x1000, 0x00000fff, iomemtype);
+ s->base = base;
+ } else {
+ s->base = 0;
+ }
+ gic_reset(s);
+ return s;
+}