Ralf Baechle | 217dd11 | 2007-11-01 01:57:55 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2000,2001,2004 Broadcom Corporation |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version 2 |
| 7 | * of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | */ |
| 18 | #include <linux/clocksource.h> |
| 19 | |
| 20 | #include <asm/addrspace.h> |
| 21 | #include <asm/io.h> |
| 22 | #include <asm/time.h> |
| 23 | |
| 24 | #include <asm/sibyte/bcm1480_regs.h> |
| 25 | #include <asm/sibyte/sb1250_regs.h> |
| 26 | #include <asm/sibyte/bcm1480_int.h> |
| 27 | #include <asm/sibyte/bcm1480_scd.h> |
| 28 | |
| 29 | #include <asm/sibyte/sb1250.h> |
| 30 | |
| 31 | static cycle_t bcm1480_hpt_read(void) |
| 32 | { |
| 33 | return (cycle_t) __raw_readq(IOADDR(A_SCD_ZBBUS_CYCLE_COUNT)); |
| 34 | } |
| 35 | |
| 36 | struct clocksource bcm1480_clocksource = { |
| 37 | .name = "zbbus-cycles", |
| 38 | .rating = 200, |
| 39 | .read = bcm1480_hpt_read, |
| 40 | .mask = CLOCKSOURCE_MASK(64), |
| 41 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
| 42 | }; |
| 43 | |
| 44 | void __init sb1480_clocksource_init(void) |
| 45 | { |
| 46 | struct clocksource *cs = &bcm1480_clocksource; |
| 47 | unsigned int plldiv; |
| 48 | unsigned long zbbus; |
| 49 | |
| 50 | plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG))); |
| 51 | zbbus = ((plldiv >> 1) * 50000000) + ((plldiv & 1) * 25000000); |
| 52 | clocksource_set_clock(cs, zbbus); |
| 53 | clocksource_register(cs); |
| 54 | } |