/* * QEMU model of the Xilinx timer block. * * Copyright (c) 2009 Edgar E. Iglesias. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "hw/sysbus.h" #include "hw/ptimer.h" #include "qemu/log.h" #define D(x) #define R_TCSR 0 #define R_TLR 1 #define R_TCR 2 #define R_MAX 4 #define TCSR_MDT (1<<0) #define TCSR_UDT (1<<1) #define TCSR_GENT (1<<2) #define TCSR_CAPT (1<<3) #define TCSR_ARHT (1<<4) #define TCSR_LOAD (1<<5) #define TCSR_ENIT (1<<6) #define TCSR_ENT (1<<7) #define TCSR_TINT (1<<8) #define TCSR_PWMA (1<<9) #define TCSR_ENALL (1<<10) struct xlx_timer { QEMUBH *bh; ptimer_state *ptimer; void *parent; int nr; /* for debug. */ unsigned long timer_div; uint32_t regs[R_MAX]; }; struct timerblock { SysBusDevice busdev; MemoryRegion mmio; qemu_irq irq; uint8_t one_timer_only; uint32_t freq_hz; struct xlx_timer *timers; }; static inline unsigned int num_timers(struct timerblock *t) { return 2 - t->one_timer_only; } static inline unsigned int timer_from_addr(hwaddr addr) { /* Timers get a 4x32bit control reg area each. */ return addr >> 2; } static void timer_update_irq(struct timerblock *t) { unsigned int i, irq = 0; uint32_t csr; for (i = 0; i < num_timers(t); i++) { csr = t->timers[i].regs[R_TCSR]; irq |= (csr & TCSR_TINT) && (csr & TCSR_ENIT); } /* All timers within the same slave share a single IRQ line. */ qemu_set_irq(t->irq, !!irq); } static uint64_t timer_read(void *opaque, hwaddr addr, unsigned int size) { struct timerblock *t = opaque; struct xlx_timer *xt; uint32_t r = 0; unsigned int timer; addr >>= 2; timer = timer_from_addr(addr); xt = &t->timers[timer]; /* Further decoding to address a specific timers reg. */ addr &= 0x3; switch (addr) { case R_TCR: r = ptimer_get_count(xt->ptimer); if (!(xt->regs[R_TCSR] & TCSR_UDT)) r = ~r; D(qemu_log("xlx_timer t=%d read counter=%x udt=%d\n", timer, r, xt->regs[R_TCSR] & TCSR_UDT)); break; default: if (addr < ARRAY_SIZE(xt->regs)) r = xt->regs[addr]; break; } D(fprintf(stderr, "%s timer=%d %x=%x\n", __func__, timer, addr * 4, r)); return r; } static void timer_enable(struct xlx_timer *xt) { uint64_t count; D(fprintf(stderr, "%s timer=%d down=%d\n", __func__, xt->nr, xt->regs[R_TCSR] & TCSR_UDT)); ptimer_stop(xt->ptimer); if (xt->regs[R_TCSR] & TCSR_UDT) count = xt->regs[R_TLR]; else count = ~0 - xt->regs[R_TLR]; ptimer_set_limit(xt->ptimer, count, 1); ptimer_run(xt->ptimer, 1); } static void timer_write(void *opaque, hwaddr addr, uint64_t val64, unsigned int size) { struct timerblock *t = opaque; struct xlx_timer *xt; unsigned int timer; uint32_t value = val64; addr >>= 2; timer = timer_from_addr(addr); xt = &t->timers[timer]; D(fprintf(stderr, "%s addr=%x val=%x (timer=%d off=%d)\n", __func__, addr * 4, value, timer, addr & 3)); /* Further decoding to address a specific timers reg. */ addr &= 3; switch (addr) { case R_TCSR: if (value & TCSR_TINT) value &= ~TCSR_TINT; xt->regs[addr] = value; if (value & TCSR_ENT) timer_enable(xt); break; default: if (addr < ARRAY_SIZE(xt->regs)) xt->regs[addr] = value; break; } timer_update_irq(t); } static const MemoryRegionOps timer_ops = { .read = timer_read, .write = timer_write, .endianness = DEVICE_NATIVE_ENDIAN, .valid = { .min_access_size = 4, .max_access_size = 4 } }; static void timer_hit(void *opaque) { struct xlx_timer *xt = opaque; struct timerblock *t = xt->parent; D(fprintf(stderr, "%s %d\n", __func__, xt->nr)); xt->regs[R_TCSR] |= TCSR_TINT; if (xt->regs[R_TCSR] & TCSR_ARHT) timer_enable(xt); timer_update_irq(t); } static int xilinx_timer_init(SysBusDevice *dev) { struct timerblock *t = FROM_SYSBUS(typeof (*t), dev); unsigned int i; /* All timers share a single irq line. */ sysbus_init_irq(dev, &t->irq); /* Init all the ptimers. */ t->timers = g_malloc0(sizeof t->timers[0] * num_timers(t)); for (i = 0; i < num_timers(t); i++) { struct xlx_timer *xt = &t->timers[i]; xt->parent = t; xt->nr = i; xt->bh = qemu_bh_new(timer_hit, xt); xt->ptimer = ptimer_init(xt->bh); ptimer_set_freq(xt->ptimer, t->freq_hz); } memory_region_init_io(&t->mmio, NULL, &timer_ops, t, "xlnx.xps-timer", R_MAX * 4 * num_timers(t)); sysbus_init_mmio(dev, &t->mmio); return 0; } static Property xilinx_timer_properties[] = { DEFINE_PROP_UINT32("clock-frequency", struct timerblock, freq_hz, 62 * 1000000), DEFINE_PROP_UINT8("one-timer-only", struct timerblock, one_timer_only, 0), DEFINE_PROP_END_OF_LIST(), }; static void xilinx_timer_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); k->init = xilinx_timer_init; dc->props = xilinx_timer_properties; } static const TypeInfo xilinx_timer_info = { .name = "xlnx.xps-timer", .parent = TYPE_SYS_BUS_DEVICE, .instance_size = sizeof(struct timerblock), .class_init = xilinx_timer_class_init, }; static void xilinx_timer_register_types(void) { type_register_static(&xilinx_timer_info); } type_init(xilinx_timer_register_types)