1 /*
2 * Copyright (C) 2000,2001,2004 Broadcom Corporation
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14 #include <linux/clocksource.h>
15 #include <linux/sched_clock.h>
16
17 #include <asm/addrspace.h>
18 #include <asm/io.h>
19 #include <asm/time.h>
20
21 #include <asm/sibyte/bcm1480_regs.h>
22 #include <asm/sibyte/sb1250_regs.h>
23 #include <asm/sibyte/bcm1480_int.h>
24 #include <asm/sibyte/bcm1480_scd.h>
25
26 #include <asm/sibyte/sb1250.h>
27
bcm1480_hpt_read(struct clocksource * cs)28 static u64 bcm1480_hpt_read(struct clocksource *cs)
29 {
30 return (u64) __raw_readq(IOADDR(A_SCD_ZBBUS_CYCLE_COUNT));
31 }
32
33 struct clocksource bcm1480_clocksource = {
34 .name = "zbbus-cycles",
35 .rating = 200,
36 .read = bcm1480_hpt_read,
37 .mask = CLOCKSOURCE_MASK(64),
38 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
39 };
40
sb1480_read_sched_clock(void)41 static u64 notrace sb1480_read_sched_clock(void)
42 {
43 return __raw_readq(IOADDR(A_SCD_ZBBUS_CYCLE_COUNT));
44 }
45
sb1480_clocksource_init(void)46 void __init sb1480_clocksource_init(void)
47 {
48 struct clocksource *cs = &bcm1480_clocksource;
49 unsigned int plldiv;
50 unsigned long zbbus;
51
52 plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
53 zbbus = ((plldiv >> 1) * 50000000) + ((plldiv & 1) * 25000000);
54 clocksource_register_hz(cs, zbbus);
55
56 sched_clock_register(sb1480_read_sched_clock, 64, zbbus);
57 }
58
