diff options
Diffstat (limited to 'hw/timer/omap_synctimer.c')
-rw-r--r-- | hw/timer/omap_synctimer.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/hw/timer/omap_synctimer.c b/hw/timer/omap_synctimer.c new file mode 100644 index 0000000..a24f35c --- /dev/null +++ b/hw/timer/omap_synctimer.c @@ -0,0 +1,102 @@ +/* + * TI OMAP2 32kHz sync timer emulation. + * + * Copyright (C) 2007-2008 Nokia Corporation + * Written by Andrzej Zaborowski <andrew@openedhand.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 or + * (at your option) any later version of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, see <http://www.gnu.org/licenses/>. + */ +#include "hw/hw.h" +#include "qemu/timer.h" +#include "hw/arm/omap.h" +struct omap_synctimer_s { + MemoryRegion iomem; + uint32_t val; + uint16_t readh; +}; + +/* 32-kHz Sync Timer of the OMAP2 */ +static uint32_t omap_synctimer_read(struct omap_synctimer_s *s) { + return muldiv64(qemu_get_clock_ns(vm_clock), 0x8000, get_ticks_per_sec()); +} + +void omap_synctimer_reset(struct omap_synctimer_s *s) +{ + s->val = omap_synctimer_read(s); +} + +static uint32_t omap_synctimer_readw(void *opaque, hwaddr addr) +{ + struct omap_synctimer_s *s = (struct omap_synctimer_s *) opaque; + + switch (addr) { + case 0x00: /* 32KSYNCNT_REV */ + return 0x21; + + case 0x10: /* CR */ + return omap_synctimer_read(s) - s->val; + } + + OMAP_BAD_REG(addr); + return 0; +} + +static uint32_t omap_synctimer_readh(void *opaque, hwaddr addr) +{ + struct omap_synctimer_s *s = (struct omap_synctimer_s *) opaque; + uint32_t ret; + + if (addr & 2) + return s->readh; + else { + ret = omap_synctimer_readw(opaque, addr); + s->readh = ret >> 16; + return ret & 0xffff; + } +} + +static void omap_synctimer_write(void *opaque, hwaddr addr, + uint32_t value) +{ + OMAP_BAD_REG(addr); +} + +static const MemoryRegionOps omap_synctimer_ops = { + .old_mmio = { + .read = { + omap_badwidth_read32, + omap_synctimer_readh, + omap_synctimer_readw, + }, + .write = { + omap_badwidth_write32, + omap_synctimer_write, + omap_synctimer_write, + }, + }, + .endianness = DEVICE_NATIVE_ENDIAN, +}; + +struct omap_synctimer_s *omap_synctimer_init(struct omap_target_agent_s *ta, + struct omap_mpu_state_s *mpu, omap_clk fclk, omap_clk iclk) +{ + struct omap_synctimer_s *s = g_malloc0(sizeof(*s)); + + omap_synctimer_reset(s); + memory_region_init_io(&s->iomem, &omap_synctimer_ops, s, "omap.synctimer", + omap_l4_region_size(ta, 0)); + omap_l4_attach(ta, 0, &s->iomem); + + return s; +} |