/* * Copyright (C) 2000,2001,2004 Broadcom Corporation * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/clocksource.h> #include <linux/sched_clock.h> #include <asm/addrspace.h> #include <asm/io.h> #include <asm/time.h> #include <asm/sibyte/bcm1480_regs.h> #include <asm/sibyte/sb1250_regs.h> #include <asm/sibyte/bcm1480_int.h> #include <asm/sibyte/bcm1480_scd.h> #include <asm/sibyte/sb1250.h> static cycle_t bcm1480_hpt_read(struct clocksource *cs) { return (cycle_t) __raw_readq(IOADDR(A_SCD_ZBBUS_CYCLE_COUNT)); } struct clocksource bcm1480_clocksource = { .name = "zbbus-cycles", .rating = 200, .read = bcm1480_hpt_read, .mask = CLOCKSOURCE_MASK(64), .flags = CLOCK_SOURCE_IS_CONTINUOUS, }; static u64 notrace sb1480_read_sched_clock(void) { return __raw_readq(IOADDR(A_SCD_ZBBUS_CYCLE_COUNT)); } void __init sb1480_clocksource_init(void) { struct clocksource *cs = &bcm1480_clocksource; unsigned int plldiv; unsigned long zbbus; plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG))); zbbus = ((plldiv >> 1) * 50000000) + ((plldiv & 1) * 25000000); clocksource_register_hz(cs, zbbus); sched_clock_register(sb1480_read_sched_clock, 64, zbbus); }