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