/* * 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 "sysbus.h" #include "sysemu.h" #include "qemu-timer.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; qemu_irq irq; uint32_t nr_timers; uint32_t freq_hz; struct xlx_timer *timers; }; static inline unsigned int timer_from_addr(target_phys_addr_t 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 < t->nr_timers; 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 uint32_t timer_readl (void *opaque, target_phys_addr_t addr) { 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(printf("%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(printf("%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_count(xt->ptimer, count); ptimer_run(xt->ptimer, 1); } static void timer_writel (void *opaque, target_phys_addr_t addr, uint32_t value) { struct timerblock *t = opaque; struct xlx_timer *xt; unsigned int timer; addr >>= 2; timer = timer_from_addr(addr); xt = &t->timers[timer]; D(printf("%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 CPUReadMemoryFunc * const timer_read[] = { NULL, NULL, &timer_readl, }; static CPUWriteMemoryFunc * const timer_write[] = { NULL, NULL, &timer_writel, }; static void timer_hit(void *opaque) { struct xlx_timer *xt = opaque; struct timerblock *t = xt->parent; D(printf("%s %d\n", __func__, timer)); 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; int timer_regs; /* All timers share a single irq line. */ sysbus_init_irq(dev, &t->irq); /* Init all the ptimers. */ t->timers = qemu_mallocz(sizeof t->timers[0] * t->nr_timers); for (i = 0; i < t->nr_timers; 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); } timer_regs = cpu_register_io_memory(timer_read, timer_write, t); sysbus_init_mmio(dev, R_MAX * 4 * t->nr_timers, timer_regs); return 0; } static SysBusDeviceInfo xilinx_timer_info = { .init = xilinx_timer_init, .qdev.name = "xilinx,timer", .qdev.size = sizeof(struct timerblock), .qdev.props = (Property[]) { DEFINE_PROP_UINT32("frequency", struct timerblock, freq_hz, 0), DEFINE_PROP_UINT32("nr-timers", struct timerblock, nr_timers, 0), DEFINE_PROP_END_OF_LIST(), } }; static void xilinx_timer_register(void) { sysbus_register_withprop(&xilinx_timer_info); } device_init(xilinx_timer_register)