2 * ARM MPCore internal peripheral emulation.
4 * Copyright (c) 2006-2007 CodeSourcery.
5 * Written by Paul Brook
7 * This code is licenced under the GPL.
11 #include "qemu-timer.h"
12 #include "primecell.h"
14 #define MPCORE_PRIV_BASE 0x10100000
16 /* ??? The MPCore TRM says the on-chip controller has 224 external IRQ lines
17 (+ 32 internal). However my test chip only exposes/reports 32.
18 More importantly Linux falls over if more than 32 are present! */
22 gic_get_current_cpu(void)
24 return cpu_single_env->cpu_index;
29 /* MPCore private memory region. */
39 struct mpcore_priv_state *mpcore;
40 int id; /* Encodes both timer/watchdog and CPU. */
43 typedef struct mpcore_priv_state {
46 mpcore_timer_state timer[8];
51 static inline void mpcore_timer_update_irq(mpcore_timer_state *s)
53 if (s->status & ~s->old_status) {
54 gic_set_pending_private(s->mpcore->gic, s->id >> 1, 29 + (s->id & 1));
56 s->old_status = s->status;
59 /* Return conversion factor from mpcore timer ticks to qemu timer ticks. */
60 static inline uint32_t mpcore_timer_scale(mpcore_timer_state *s)
62 return (((s->control >> 8) & 0xff) + 1) * 10;
65 static void mpcore_timer_reload(mpcore_timer_state *s, int restart)
70 s->tick = qemu_get_clock(vm_clock);
71 s->tick += (int64_t)s->count * mpcore_timer_scale(s);
72 qemu_mod_timer(s->timer, s->tick);
75 static void mpcore_timer_tick(void *opaque)
77 mpcore_timer_state *s = (mpcore_timer_state *)opaque;
81 mpcore_timer_reload(s, 0);
85 mpcore_timer_update_irq(s);
88 static uint32_t mpcore_timer_read(mpcore_timer_state *s, int offset)
95 case 4: /* Counter. */
96 if (((s->control & 1) == 0) || (s->count == 0))
98 /* Slow and ugly, but hopefully won't happen too often. */
99 val = s->tick - qemu_get_clock(vm_clock);
100 val /= mpcore_timer_scale(s);
104 case 8: /* Control. */
106 case 12: /* Interrupt status. */
111 static void mpcore_timer_write(mpcore_timer_state *s, int offset,
119 case 4: /* Counter. */
120 if ((s->control & 1) && s->count) {
121 /* Cancel the previous timer. */
122 qemu_del_timer(s->timer);
125 if (s->control & 1) {
126 mpcore_timer_reload(s, 1);
129 case 8: /* Control. */
132 if (((old & 1) == 0) && (value & 1)) {
133 if (s->count == 0 && (s->control & 2))
135 mpcore_timer_reload(s, 1);
138 case 12: /* Interrupt status. */
140 mpcore_timer_update_irq(s);
145 static void mpcore_timer_init(mpcore_priv_state *mpcore,
146 mpcore_timer_state *s, int id)
150 s->timer = qemu_new_timer(vm_clock, mpcore_timer_tick, s);
154 /* Per-CPU private memory mapped IO. */
156 static uint32_t mpcore_priv_read(void *opaque, target_phys_addr_t offset)
158 mpcore_priv_state *s = (mpcore_priv_state *)opaque;
161 if (offset < 0x100) {
164 case 0x00: /* Control. */
165 return s->scu_control;
166 case 0x04: /* Configuration. */
168 case 0x08: /* CPU status. */
170 case 0x0c: /* Invalidate all. */
175 } else if (offset < 0x600) {
176 /* Interrupt controller. */
177 if (offset < 0x200) {
178 id = gic_get_current_cpu();
180 id = (offset - 0x200) >> 8;
182 return gic_cpu_read(s->gic, id, offset & 0xff);
183 } else if (offset < 0xb00) {
185 if (offset < 0x700) {
186 id = gic_get_current_cpu();
188 id = (offset - 0x700) >> 8;
193 return mpcore_timer_read(&s->timer[id], offset & 0xf);
196 cpu_abort(cpu_single_env, "mpcore_priv_read: Bad offset %x\n",
201 static void mpcore_priv_write(void *opaque, target_phys_addr_t offset,
204 mpcore_priv_state *s = (mpcore_priv_state *)opaque;
207 if (offset < 0x100) {
210 case 0: /* Control register. */
211 s->scu_control = value & 1;
213 case 0x0c: /* Invalidate all. */
214 /* This is a no-op as cache is not emulated. */
219 } else if (offset < 0x600) {
220 /* Interrupt controller. */
221 if (offset < 0x200) {
222 id = gic_get_current_cpu();
224 id = (offset - 0x200) >> 8;
226 gic_cpu_write(s->gic, id, offset & 0xff, value);
227 } else if (offset < 0xb00) {
229 if (offset < 0x700) {
230 id = gic_get_current_cpu();
232 id = (offset - 0x700) >> 8;
237 mpcore_timer_write(&s->timer[id], offset & 0xf, value);
242 cpu_abort(cpu_single_env, "mpcore_priv_read: Bad offset %x\n",
246 static CPUReadMemoryFunc *mpcore_priv_readfn[] = {
252 static CPUWriteMemoryFunc *mpcore_priv_writefn[] = {
259 static qemu_irq *mpcore_priv_init(uint32_t base, qemu_irq *pic_irq)
261 mpcore_priv_state *s;
265 s = (mpcore_priv_state *)qemu_mallocz(sizeof(mpcore_priv_state));
268 s->gic = gic_init(base, pic_irq);
271 iomemtype = cpu_register_io_memory(0, mpcore_priv_readfn,
272 mpcore_priv_writefn, s);
273 cpu_register_physical_memory(base, 0x00001000, iomemtype);
274 for (i = 0; i < 8; i++) {
275 mpcore_timer_init(s, &s->timer[i], i);
280 /* Dummy PIC to route IRQ lines. The baseboard has 4 independent IRQ
281 controllers. The output of these, plus some of the raw input lines
282 are fed into a single SMP-aware interrupt controller on the CPU. */
288 /* Map baseboard IRQs onto CPU IRQ lines. */
289 static const int mpcore_irq_map[32] = {
290 -1, -1, -1, -1, 1, 2, -1, -1,
291 -1, -1, 6, -1, 4, 5, -1, -1,
292 -1, 14, 15, 0, 7, 8, -1, -1,
293 -1, -1, -1, -1, 9, 3, -1, -1,
296 static void mpcore_rirq_set_irq(void *opaque, int irq, int level)
298 mpcore_rirq_state *s = (mpcore_rirq_state *)opaque;
301 for (i = 0; i < 4; i++) {
302 qemu_set_irq(s->rvic[i][irq], level);
305 irq = mpcore_irq_map[irq];
307 qemu_set_irq(s->cpuic[irq], level);
312 qemu_irq *mpcore_irq_init(qemu_irq *cpu_irq)
314 mpcore_rirq_state *s;
317 /* ??? IRQ routing is hardcoded to "normal" mode. */
318 s = qemu_mallocz(sizeof(mpcore_rirq_state));
319 s->cpuic = mpcore_priv_init(MPCORE_PRIV_BASE, cpu_irq);
320 for (n = 0; n < 4; n++) {
321 s->rvic[n] = realview_gic_init(0x10040000 + n * 0x10000,
324 return qemu_allocate_irqs(mpcore_rirq_set_irq, s, 64);