mirror of https://gitee.com/openkylin/qemu.git
111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
/*
|
|
* 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 "qemu/osdep.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_clock_get_ns(QEMU_CLOCK_VIRTUAL), 0x8000,
|
|
NANOSECONDS_PER_SECOND);
|
|
}
|
|
|
|
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 uint64_t omap_synctimer_readfn(void *opaque, hwaddr addr,
|
|
unsigned size)
|
|
{
|
|
switch (size) {
|
|
case 1:
|
|
return omap_badwidth_read32(opaque, addr);
|
|
case 2:
|
|
return omap_synctimer_readh(opaque, addr);
|
|
case 4:
|
|
return omap_synctimer_readw(opaque, addr);
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
}
|
|
|
|
static void omap_synctimer_writefn(void *opaque, hwaddr addr,
|
|
uint64_t value, unsigned size)
|
|
{
|
|
OMAP_BAD_REG(addr);
|
|
}
|
|
|
|
static const MemoryRegionOps omap_synctimer_ops = {
|
|
.read = omap_synctimer_readfn,
|
|
.write = omap_synctimer_writefn,
|
|
.valid.min_access_size = 1,
|
|
.valid.max_access_size = 4,
|
|
.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, NULL, &omap_synctimer_ops, s, "omap.synctimer",
|
|
omap_l4_region_size(ta, 0));
|
|
omap_l4_attach(ta, 0, &s->iomem);
|
|
|
|
return s;
|
|
}
|