/* * QEMU model of the Xilinx ZynqMP Real Time Clock (RTC). * * Copyright (c) 2017 Xilinx Inc. * * Written-by: Alistair Francis * * 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 "qemu/osdep.h" #include "hw/sysbus.h" #include "hw/register.h" #include "qemu/bitops.h" #include "qemu/log.h" #include "qemu/module.h" #include "hw/irq.h" #include "qemu/cutils.h" #include "sysemu/sysemu.h" #include "sysemu/rtc.h" #include "trace.h" #include "hw/rtc/xlnx-zynqmp-rtc.h" #include "migration/vmstate.h" #ifndef XLNX_ZYNQMP_RTC_ERR_DEBUG #define XLNX_ZYNQMP_RTC_ERR_DEBUG 0 #endif static void rtc_int_update_irq(XlnxZynqMPRTC *s) { bool pending = s->regs[R_RTC_INT_STATUS] & ~s->regs[R_RTC_INT_MASK]; qemu_set_irq(s->irq_rtc_int, pending); } static void addr_error_int_update_irq(XlnxZynqMPRTC *s) { bool pending = s->regs[R_ADDR_ERROR] & ~s->regs[R_ADDR_ERROR_INT_MASK]; qemu_set_irq(s->irq_addr_error_int, pending); } static uint32_t rtc_get_count(XlnxZynqMPRTC *s) { int64_t now = qemu_clock_get_ns(rtc_clock); return s->tick_offset + now / NANOSECONDS_PER_SECOND; } static uint64_t current_time_postr(RegisterInfo *reg, uint64_t val64) { XlnxZynqMPRTC *s = XLNX_ZYNQMP_RTC(reg->opaque); return rtc_get_count(s); } static void rtc_int_status_postw(RegisterInfo *reg, uint64_t val64) { XlnxZynqMPRTC *s = XLNX_ZYNQMP_RTC(reg->opaque); rtc_int_update_irq(s); } static uint64_t rtc_int_en_prew(RegisterInfo *reg, uint64_t val64) { XlnxZynqMPRTC *s = XLNX_ZYNQMP_RTC(reg->opaque); s->regs[R_RTC_INT_MASK] &= (uint32_t) ~val64; rtc_int_update_irq(s); return 0; } static uint64_t rtc_int_dis_prew(RegisterInfo *reg, uint64_t val64) { XlnxZynqMPRTC *s = XLNX_ZYNQMP_RTC(reg->opaque); s->regs[R_RTC_INT_MASK] |= (uint32_t) val64; rtc_int_update_irq(s); return 0; } static void addr_error_postw(RegisterInfo *reg, uint64_t val64) { XlnxZynqMPRTC *s = XLNX_ZYNQMP_RTC(reg->opaque); addr_error_int_update_irq(s); } static uint64_t addr_error_int_en_prew(RegisterInfo *reg, uint64_t val64) { XlnxZynqMPRTC *s = XLNX_ZYNQMP_RTC(reg->opaque); s->regs[R_ADDR_ERROR_INT_MASK] &= (uint32_t) ~val64; addr_error_int_update_irq(s); return 0; } static uint64_t addr_error_int_dis_prew(RegisterInfo *reg, uint64_t val64) { XlnxZynqMPRTC *s = XLNX_ZYNQMP_RTC(reg->opaque); s->regs[R_ADDR_ERROR_INT_MASK] |= (uint32_t) val64; addr_error_int_update_irq(s); return 0; } static const RegisterAccessInfo rtc_regs_info[] = { { .name = "SET_TIME_WRITE", .addr = A_SET_TIME_WRITE, .unimp = MAKE_64BIT_MASK(0, 32), },{ .name = "SET_TIME_READ", .addr = A_SET_TIME_READ, .ro = 0xffffffff, .post_read = current_time_postr, },{ .name = "CALIB_WRITE", .addr = A_CALIB_WRITE, .unimp = MAKE_64BIT_MASK(0, 32), },{ .name = "CALIB_READ", .addr = A_CALIB_READ, .ro = 0x1fffff, },{ .name = "CURRENT_TIME", .addr = A_CURRENT_TIME, .ro = 0xffffffff, .post_read = current_time_postr, },{ .name = "CURRENT_TICK", .addr = A_CURRENT_TICK, .ro = 0xffff, },{ .name = "ALARM", .addr = A_ALARM, },{ .name = "RTC_INT_STATUS", .addr = A_RTC_INT_STATUS, .w1c = 0x3, .post_write = rtc_int_status_postw, },{ .name = "RTC_INT_MASK", .addr = A_RTC_INT_MASK, .reset = 0x3, .ro = 0x3, },{ .name = "RTC_INT_EN", .addr = A_RTC_INT_EN, .pre_write = rtc_int_en_prew, },{ .name = "RTC_INT_DIS", .addr = A_RTC_INT_DIS, .pre_write = rtc_int_dis_prew, },{ .name = "ADDR_ERROR", .addr = A_ADDR_ERROR, .w1c = 0x1, .post_write = addr_error_postw, },{ .name = "ADDR_ERROR_INT_MASK", .addr = A_ADDR_ERROR_INT_MASK, .reset = 0x1, .ro = 0x1, },{ .name = "ADDR_ERROR_INT_EN", .addr = A_ADDR_ERROR_INT_EN, .pre_write = addr_error_int_en_prew, },{ .name = "ADDR_ERROR_INT_DIS", .addr = A_ADDR_ERROR_INT_DIS, .pre_write = addr_error_int_dis_prew, },{ .name = "CONTROL", .addr = A_CONTROL, .reset = 0x1000000, .rsvd = 0x70fffffe, },{ .name = "SAFETY_CHK", .addr = A_SAFETY_CHK, } }; static void rtc_reset(DeviceState *dev) { XlnxZynqMPRTC *s = XLNX_ZYNQMP_RTC(dev); unsigned int i; for (i = 0; i < ARRAY_SIZE(s->regs_info); ++i) { register_reset(&s->regs_info[i]); } rtc_int_update_irq(s); addr_error_int_update_irq(s); } static const MemoryRegionOps rtc_ops = { .read = register_read_memory, .write = register_write_memory, .endianness = DEVICE_LITTLE_ENDIAN, .valid = { .min_access_size = 4, .max_access_size = 4, }, }; static void rtc_init(Object *obj) { XlnxZynqMPRTC *s = XLNX_ZYNQMP_RTC(obj); SysBusDevice *sbd = SYS_BUS_DEVICE(obj); RegisterInfoArray *reg_array; struct tm current_tm; memory_region_init(&s->iomem, obj, TYPE_XLNX_ZYNQMP_RTC, XLNX_ZYNQMP_RTC_R_MAX * 4); reg_array = register_init_block32(DEVICE(obj), rtc_regs_info, ARRAY_SIZE(rtc_regs_info), s->regs_info, s->regs, &rtc_ops, XLNX_ZYNQMP_RTC_ERR_DEBUG, XLNX_ZYNQMP_RTC_R_MAX * 4); memory_region_add_subregion(&s->iomem, 0x0, ®_array->mem); sysbus_init_mmio(sbd, &s->iomem); sysbus_init_irq(sbd, &s->irq_rtc_int); sysbus_init_irq(sbd, &s->irq_addr_error_int); qemu_get_timedate(¤t_tm, 0); s->tick_offset = mktimegm(¤t_tm) - qemu_clock_get_ns(rtc_clock) / NANOSECONDS_PER_SECOND; trace_xlnx_zynqmp_rtc_gettime(current_tm.tm_year, current_tm.tm_mon, current_tm.tm_mday, current_tm.tm_hour, current_tm.tm_min, current_tm.tm_sec); } static int rtc_pre_save(void *opaque) { XlnxZynqMPRTC *s = opaque; int64_t now = qemu_clock_get_ns(rtc_clock) / NANOSECONDS_PER_SECOND; /* Add the time at migration */ s->tick_offset = s->tick_offset + now; return 0; } static int rtc_post_load(void *opaque, int version_id) { XlnxZynqMPRTC *s = opaque; int64_t now = qemu_clock_get_ns(rtc_clock) / NANOSECONDS_PER_SECOND; /* Subtract the time after migration. This combined with the pre_save * action results in us having subtracted the time that the guest was * stopped to the offset. */ s->tick_offset = s->tick_offset - now; return 0; } static const VMStateDescription vmstate_rtc = { .name = TYPE_XLNX_ZYNQMP_RTC, .version_id = 1, .minimum_version_id = 1, .pre_save = rtc_pre_save, .post_load = rtc_post_load, .fields = (const VMStateField[]) { VMSTATE_UINT32_ARRAY(regs, XlnxZynqMPRTC, XLNX_ZYNQMP_RTC_R_MAX), VMSTATE_UINT32(tick_offset, XlnxZynqMPRTC), VMSTATE_END_OF_LIST(), } }; static void rtc_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); device_class_set_legacy_reset(dc, rtc_reset); dc->vmsd = &vmstate_rtc; } static const TypeInfo rtc_info = { .name = TYPE_XLNX_ZYNQMP_RTC, .parent = TYPE_SYS_BUS_DEVICE, .instance_size = sizeof(XlnxZynqMPRTC), .class_init = rtc_class_init, .instance_init = rtc_init, }; static void rtc_register_types(void) { type_register_static(&rtc_info); } type_init(rtc_register_types)