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