blob: 945711eff56e0d7af122fdce20ae31f91ed9ba5c [file] [log] [blame]
cmchao011d87d2010-05-31 23:54:16 +08001/*
2 * TI OMAP2 32kHz sync timer emulation.
3 *
4 * Copyright (C) 2007-2008 Nokia Corporation
5 * Written by Andrzej Zaborowski <andrew@openedhand.com>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 or
10 * (at your option) any later version of the License.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, see <http://www.gnu.org/licenses/>.
19 */
20#include "hw.h"
Paolo Bonzini1de7afc2012-12-17 18:20:00 +010021#include "qemu/timer.h"
cmchao011d87d2010-05-31 23:54:16 +080022#include "omap.h"
23struct omap_synctimer_s {
Avi Kivityfcb40162011-11-24 14:32:34 +020024 MemoryRegion iomem;
cmchao011d87d2010-05-31 23:54:16 +080025 uint32_t val;
26 uint16_t readh;
27};
28
29/* 32-kHz Sync Timer of the OMAP2 */
30static uint32_t omap_synctimer_read(struct omap_synctimer_s *s) {
Paolo Bonzini74475452011-03-11 16:47:48 +010031 return muldiv64(qemu_get_clock_ns(vm_clock), 0x8000, get_ticks_per_sec());
cmchao011d87d2010-05-31 23:54:16 +080032}
33
34void omap_synctimer_reset(struct omap_synctimer_s *s)
35{
36 s->val = omap_synctimer_read(s);
37}
38
Avi Kivitya8170e52012-10-23 12:30:10 +020039static uint32_t omap_synctimer_readw(void *opaque, hwaddr addr)
cmchao011d87d2010-05-31 23:54:16 +080040{
41 struct omap_synctimer_s *s = (struct omap_synctimer_s *) opaque;
42
43 switch (addr) {
44 case 0x00: /* 32KSYNCNT_REV */
45 return 0x21;
46
47 case 0x10: /* CR */
48 return omap_synctimer_read(s) - s->val;
49 }
50
51 OMAP_BAD_REG(addr);
52 return 0;
53}
54
Avi Kivitya8170e52012-10-23 12:30:10 +020055static uint32_t omap_synctimer_readh(void *opaque, hwaddr addr)
cmchao011d87d2010-05-31 23:54:16 +080056{
57 struct omap_synctimer_s *s = (struct omap_synctimer_s *) opaque;
58 uint32_t ret;
59
60 if (addr & 2)
61 return s->readh;
62 else {
63 ret = omap_synctimer_readw(opaque, addr);
64 s->readh = ret >> 16;
65 return ret & 0xffff;
66 }
67}
68
Avi Kivitya8170e52012-10-23 12:30:10 +020069static void omap_synctimer_write(void *opaque, hwaddr addr,
cmchao011d87d2010-05-31 23:54:16 +080070 uint32_t value)
71{
72 OMAP_BAD_REG(addr);
73}
74
Avi Kivityfcb40162011-11-24 14:32:34 +020075static const MemoryRegionOps omap_synctimer_ops = {
76 .old_mmio = {
77 .read = {
78 omap_badwidth_read32,
79 omap_synctimer_readh,
80 omap_synctimer_readw,
81 },
82 .write = {
83 omap_badwidth_write32,
84 omap_synctimer_write,
85 omap_synctimer_write,
86 },
87 },
88 .endianness = DEVICE_NATIVE_ENDIAN,
cmchao011d87d2010-05-31 23:54:16 +080089};
90
91struct omap_synctimer_s *omap_synctimer_init(struct omap_target_agent_s *ta,
92 struct omap_mpu_state_s *mpu, omap_clk fclk, omap_clk iclk)
93{
Anthony Liguori7267c092011-08-20 22:09:37 -050094 struct omap_synctimer_s *s = g_malloc0(sizeof(*s));
cmchao011d87d2010-05-31 23:54:16 +080095
96 omap_synctimer_reset(s);
Avi Kivityfcb40162011-11-24 14:32:34 +020097 memory_region_init_io(&s->iomem, &omap_synctimer_ops, s, "omap.synctimer",
98 omap_l4_region_size(ta, 0));
Avi Kivityf44336c2011-11-28 15:40:49 +020099 omap_l4_attach(ta, 0, &s->iomem);
cmchao011d87d2010-05-31 23:54:16 +0800100
101 return s;
102}