| /* |
| * 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. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| */ |
| #include <linux/clocksource.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, |
| }; |
| |
| 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); |
| } |