1/*
2 * Setting up the clock on MSP SOCs.  No RTC typically.
3 *
4 * Carsten Langgaard, carstenl@mips.com
5 * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
6 *
7 * ########################################################################
8 *
9 *  This program is free software; you can distribute it and/or modify it
10 *  under the terms of the GNU General Public License (Version 2) as
11 *  published by the Free Software Foundation.
12 *
13 *  This program is distributed in the hope it will be useful, but WITHOUT
14 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
16 *  for more details.
17 *
18 *  You should have received a copy of the GNU General Public License along
19 *  with this program; if not, write to the Free Software Foundation, Inc.,
20 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
21 *
22 * ########################################################################
23 */
24
25#include <linux/init.h>
26#include <linux/kernel_stat.h>
27#include <linux/sched.h>
28#include <linux/spinlock.h>
29#include <linux/module.h>
30#include <linux/ptrace.h>
31
32#include <asm/cevt-r4k.h>
33#include <asm/mipsregs.h>
34#include <asm/time.h>
35
36#include <msp_prom.h>
37#include <msp_int.h>
38#include <msp_regs.h>
39
40#define get_current_vpe()   \
41	((read_c0_tcbind() >> TCBIND_CURVPE_SHIFT) & TCBIND_CURVPE)
42
43static struct irqaction timer_vpe1;
44static int tim_installed;
45
46void __init plat_time_init(void)
47{
48	char	*endp, *s;
49	unsigned long cpu_rate = 0;
50
51	if (cpu_rate == 0) {
52		s = prom_getenv("clkfreqhz");
53		cpu_rate = simple_strtoul(s, &endp, 10);
54		if (endp != NULL && *endp != 0) {
55			printk(KERN_ERR
56				"Clock rate in Hz parse error: %s\n", s);
57			cpu_rate = 0;
58		}
59	}
60
61	if (cpu_rate == 0) {
62		s = prom_getenv("clkfreq");
63		cpu_rate = 1000 * simple_strtoul(s, &endp, 10);
64		if (endp != NULL && *endp != 0) {
65			printk(KERN_ERR
66				"Clock rate in MHz parse error: %s\n", s);
67			cpu_rate = 0;
68		}
69	}
70
71	if (cpu_rate == 0) {
72#if defined(CONFIG_PMC_MSP7120_EVAL) \
73 || defined(CONFIG_PMC_MSP7120_GW)
74		cpu_rate = 400000000;
75#elif defined(CONFIG_PMC_MSP7120_FPGA)
76		cpu_rate = 25000000;
77#else
78		cpu_rate = 150000000;
79#endif
80		printk(KERN_ERR
81			"Failed to determine CPU clock rate, "
82			"assuming %ld hz ...\n", cpu_rate);
83	}
84
85	printk(KERN_WARNING "Clock rate set to %ld\n", cpu_rate);
86
87	/* timer frequency is 1/2 clock rate */
88	mips_hpt_frequency = cpu_rate/2;
89}
90
91unsigned int get_c0_compare_int(void)
92{
93	/* MIPS_MT modes may want timer for second VPE */
94	if ((get_current_vpe()) && !tim_installed) {
95		memcpy(&timer_vpe1, &c0_compare_irqaction, sizeof(timer_vpe1));
96		setup_irq(MSP_INT_VPE1_TIMER, &timer_vpe1);
97		tim_installed++;
98	}
99
100	return get_current_vpe() ? MSP_INT_VPE1_TIMER : MSP_INT_VPE0_TIMER;
101}
102