cmchao | 011d87d | 2010-05-31 23:54:16 +0800 | [diff] [blame] | 1 | /* |
| 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 Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 21 | #include "qemu/timer.h" |
cmchao | 011d87d | 2010-05-31 23:54:16 +0800 | [diff] [blame] | 22 | #include "omap.h" |
| 23 | struct omap_synctimer_s { |
Avi Kivity | fcb4016 | 2011-11-24 14:32:34 +0200 | [diff] [blame] | 24 | MemoryRegion iomem; |
cmchao | 011d87d | 2010-05-31 23:54:16 +0800 | [diff] [blame] | 25 | uint32_t val; |
| 26 | uint16_t readh; |
| 27 | }; |
| 28 | |
| 29 | /* 32-kHz Sync Timer of the OMAP2 */ |
| 30 | static uint32_t omap_synctimer_read(struct omap_synctimer_s *s) { |
Paolo Bonzini | 7447545 | 2011-03-11 16:47:48 +0100 | [diff] [blame] | 31 | return muldiv64(qemu_get_clock_ns(vm_clock), 0x8000, get_ticks_per_sec()); |
cmchao | 011d87d | 2010-05-31 23:54:16 +0800 | [diff] [blame] | 32 | } |
| 33 | |
| 34 | void omap_synctimer_reset(struct omap_synctimer_s *s) |
| 35 | { |
| 36 | s->val = omap_synctimer_read(s); |
| 37 | } |
| 38 | |
Avi Kivity | a8170e5 | 2012-10-23 12:30:10 +0200 | [diff] [blame] | 39 | static uint32_t omap_synctimer_readw(void *opaque, hwaddr addr) |
cmchao | 011d87d | 2010-05-31 23:54:16 +0800 | [diff] [blame] | 40 | { |
| 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 Kivity | a8170e5 | 2012-10-23 12:30:10 +0200 | [diff] [blame] | 55 | static uint32_t omap_synctimer_readh(void *opaque, hwaddr addr) |
cmchao | 011d87d | 2010-05-31 23:54:16 +0800 | [diff] [blame] | 56 | { |
| 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 Kivity | a8170e5 | 2012-10-23 12:30:10 +0200 | [diff] [blame] | 69 | static void omap_synctimer_write(void *opaque, hwaddr addr, |
cmchao | 011d87d | 2010-05-31 23:54:16 +0800 | [diff] [blame] | 70 | uint32_t value) |
| 71 | { |
| 72 | OMAP_BAD_REG(addr); |
| 73 | } |
| 74 | |
Avi Kivity | fcb4016 | 2011-11-24 14:32:34 +0200 | [diff] [blame] | 75 | static 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, |
cmchao | 011d87d | 2010-05-31 23:54:16 +0800 | [diff] [blame] | 89 | }; |
| 90 | |
| 91 | struct 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 Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 94 | struct omap_synctimer_s *s = g_malloc0(sizeof(*s)); |
cmchao | 011d87d | 2010-05-31 23:54:16 +0800 | [diff] [blame] | 95 | |
| 96 | omap_synctimer_reset(s); |
Avi Kivity | fcb4016 | 2011-11-24 14:32:34 +0200 | [diff] [blame] | 97 | memory_region_init_io(&s->iomem, &omap_synctimer_ops, s, "omap.synctimer", |
| 98 | omap_l4_region_size(ta, 0)); |
Avi Kivity | f44336c | 2011-11-28 15:40:49 +0200 | [diff] [blame] | 99 | omap_l4_attach(ta, 0, &s->iomem); |
cmchao | 011d87d | 2010-05-31 23:54:16 +0800 | [diff] [blame] | 100 | |
| 101 | return s; |
| 102 | } |