1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2000,2001,2004 Broadcom Corporation
4 */
5 #include <linux/clocksource.h>
6 #include <linux/sched_clock.h>
7
8 #include <asm/addrspace.h>
9 #include <asm/io.h>
10 #include <asm/time.h>
11
12 #include <asm/sibyte/bcm1480_regs.h>
13 #include <asm/sibyte/sb1250_regs.h>
14 #include <asm/sibyte/bcm1480_int.h>
15 #include <asm/sibyte/bcm1480_scd.h>
16
17 #include <asm/sibyte/sb1250.h>
18
19 static u64 bcm1480_hpt_read(struct clocksource *cs)
20 {
21 return (u64) __raw_readq(IOADDR(A_SCD_ZBBUS_CYCLE_COUNT));
22 }
23
24 struct clocksource bcm1480_clocksource = {
25 .name = "zbbus-cycles",
26 .rating = 200,
27 .read = bcm1480_hpt_read,
28 .mask = CLOCKSOURCE_MASK(64),
29 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
30 };
31
32 static u64 notrace sb1480_read_sched_clock(void)
33 {
34 return __raw_readq(IOADDR(A_SCD_ZBBUS_CYCLE_COUNT));
35 }
36
37 void __init sb1480_clocksource_init(void)
38 {
39 struct clocksource *cs = &bcm1480_clocksource;
40 unsigned int plldiv;
41 unsigned long zbbus;
42
43 plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
44 zbbus = ((plldiv >> 1) * 50000000) + ((plldiv & 1) * 25000000);
45 clocksource_register_hz(cs, zbbus);
46
47 sched_clock_register(sb1480_read_sched_clock, 64, zbbus);
48 }
49
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