1/*
2 *  Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org>
3 *
4 *  This program is free software; you can redistribute  it and/or modify it
5 *  under  the terms of  the GNU General  Public License as published by the
6 *  Free Software Foundation;  either version 2 of the  License, or (at your
7 *  option) any later version.
8 *
9 *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
10 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
11 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
12 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
13 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
14 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
15 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
16 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
17 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
18 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
19 *
20 *  You should have received a copy of the  GNU General Public License along
21 *  with this program; if not, write  to the Free Software Foundation, Inc.,
22 *  675 Mass Ave, Cambridge, MA 02139, USA.
23 */
24
25#include <linux/init.h>
26#include <linux/ssb/ssb.h>
27#include <asm/time.h>
28#include <bcm47xx.h>
29#include <bcm47xx_board.h>
30
31void __init plat_time_init(void)
32{
33	unsigned long hz = 0;
34	u16 chip_id = 0;
35	char buf[10];
36	int len;
37	enum bcm47xx_board board = bcm47xx_board_get();
38
39	/*
40	 * Use deterministic values for initial counter interrupt
41	 * so that calibrate delay avoids encountering a counter wrap.
42	 */
43	write_c0_count(0);
44	write_c0_compare(0xffff);
45
46	switch (bcm47xx_bus_type) {
47#ifdef CONFIG_BCM47XX_SSB
48	case BCM47XX_BUS_TYPE_SSB:
49		hz = ssb_cpu_clock(&bcm47xx_bus.ssb.mipscore) / 2;
50		chip_id = bcm47xx_bus.ssb.chip_id;
51		break;
52#endif
53#ifdef CONFIG_BCM47XX_BCMA
54	case BCM47XX_BUS_TYPE_BCMA:
55		hz = bcma_cpu_clock(&bcm47xx_bus.bcma.bus.drv_mips) / 2;
56		chip_id = bcm47xx_bus.bcma.bus.chipinfo.id;
57		break;
58#endif
59	}
60
61	if (chip_id == 0x5354) {
62		len = bcm47xx_nvram_getenv("clkfreq", buf, sizeof(buf));
63		if (len >= 0 && !strncmp(buf, "200", 4))
64			hz = 100000000;
65	}
66
67	switch (board) {
68	case BCM47XX_BOARD_ASUS_WL520GC:
69	case BCM47XX_BOARD_ASUS_WL520GU:
70		hz = 100000000;
71		break;
72	default:
73		break;
74	}
75
76	if (!hz)
77		hz = 100000000;
78
79	/* Set MIPS counter frequency for fixed_rate_gettimeoffset() */
80	mips_hpt_frequency = hz;
81}
82