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217dd11e RB |
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 | ||
8e19608e | 31 | static cycle_t bcm1480_hpt_read(struct clocksource *cs) |
217dd11e RB |
32 | { |
33 | return (cycle_t) __raw_readq(IOADDR(A_SCD_ZBBUS_CYCLE_COUNT)); | |
34 | } | |
35 | ||
36 | struct clocksource bcm1480_clocksource = { | |
37 | .name = "zbbus-cycles", | |
70342287 | 38 | .rating = 200, |
217dd11e RB |
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); | |
75c4fd8c | 52 | clocksource_register_hz(cs, zbbus); |
217dd11e | 53 | } |