aboutsummaryrefslogtreecommitdiff
path: root/arch/sparc/kernel/time_32.c
blob: e404b063be2cbc1d141c899c2e91f1ad79463989 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
/* linux/arch/sparc/kernel/time.c
 *
 * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
 * Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
 *
 * Chris Davis (cdavis@cois.on.ca) 03/27/1998
 * Added support for the intersil on the sun4/4200
 *
 * Gleb Raiko (rajko@mech.math.msu.su) 08/18/1998
 * Support for MicroSPARC-IIep, PCI CPU.
 *
 * This file handles the Sparc specific time handling details.
 *
 * 1997-09-10	Updated NTP code according to technical memorandum Jan '96
 *		"A Kernel Model for Precision Timekeeping" by Dave Mills
 */
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/time.h>
#include <linux/rtc.h>
#include <linux/rtc/m48t59.h>
#include <linux/timex.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/profile.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>

#include <asm/oplib.h>
#include <asm/timex.h>
#include <asm/timer.h>
#include <asm/system.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/idprom.h>
#include <asm/machines.h>
#include <asm/page.h>
#include <asm/pcic.h>
#include <asm/irq_regs.h>

#include "irq.h"

DEFINE_SPINLOCK(rtc_lock);
EXPORT_SYMBOL(rtc_lock);

static int set_rtc_mmss(unsigned long);

unsigned long profile_pc(struct pt_regs *regs)
{
	extern char __copy_user_begin[], __copy_user_end[];
	extern char __atomic_begin[], __atomic_end[];
	extern char __bzero_begin[], __bzero_end[];

	unsigned long pc = regs->pc;

	if (in_lock_functions(pc) ||
	    (pc >= (unsigned long) __copy_user_begin &&
	     pc < (unsigned long) __copy_user_end) ||
	    (pc >= (unsigned long) __atomic_begin &&
	     pc < (unsigned long) __atomic_end) ||
	    (pc >= (unsigned long) __bzero_begin &&
	     pc < (unsigned long) __bzero_end))
		pc = regs->u_regs[UREG_RETPC];
	return pc;
}

EXPORT_SYMBOL(profile_pc);

__volatile__ unsigned int *master_l10_counter;

u32 (*do_arch_gettimeoffset)(void);

int update_persistent_clock(struct timespec now)
{
	return set_rtc_mmss(now.tv_sec);
}

/*
 * timer_interrupt() needs to keep up the real-time clock,
 * as well as call the "do_timer()" routine every clocktick
 */

#define TICK_SIZE (tick_nsec / 1000)

static irqreturn_t timer_interrupt(int dummy, void *dev_id)
{
#ifndef CONFIG_SMP
	profile_tick(CPU_PROFILING);
#endif

	/* Protect counter clear so that do_gettimeoffset works */
	write_seqlock(&xtime_lock);

	clear_clock_irq();

	do_timer(1);

	write_sequnlock(&xtime_lock);

#ifndef CONFIG_SMP
	update_process_times(user_mode(get_irq_regs()));
#endif
	return IRQ_HANDLED;
}

static unsigned char mostek_read_byte(struct device *dev, u32 ofs)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct m48t59_plat_data *pdata = pdev->dev.platform_data;

	return readb(pdata->ioaddr + ofs);
}

static void mostek_write_byte(struct device *dev, u32 ofs, u8 val)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct m48t59_plat_data *pdata = pdev->dev.platform_data;

	writeb(val, pdata->ioaddr + ofs);
}

static struct m48t59_plat_data m48t59_data = {
	.read_byte = mostek_read_byte,
	.write_byte = mostek_write_byte,
};

/* resource is set at runtime */
static struct platform_device m48t59_rtc = {
	.name		= "rtc-m48t59",
	.id		= 0,
	.num_resources	= 1,
	.dev	= {
		.platform_data = &m48t59_data,
	},
};

static int __devinit clock_probe(struct of_device *op, const struct of_device_id *match)
{
	struct device_node *dp = op->dev.of_node;
	const char *model = of_get_property(dp, "model", NULL);

	if (!model)
		return -ENODEV;

	m48t59_rtc.resource = &op->resource[0];
	if (!strcmp(model, "mk48t02")) {
		/* Map the clock register io area read-only */
		m48t59_data.ioaddr = of_ioremap(&op->resource[0], 0,
						2048, "rtc-m48t59");
		m48t59_data.type = M48T59RTC_TYPE_M48T02;
	} else if (!strcmp(model, "mk48t08")) {
		m48t59_data.ioaddr = of_ioremap(&op->resource[0], 0,
						8192, "rtc-m48t59");
		m48t59_data.type = M48T59RTC_TYPE_M48T08;
	} else
		return -ENODEV;

	if (platform_device_register(&m48t59_rtc) < 0)
		printk(KERN_ERR "Registering RTC device failed\n");

	return 0;
}

static struct of_device_id __initdata clock_match[] = {
	{
		.name = "eeprom",
	},
	{},
};

static struct of_platform_driver clock_driver = {
	.probe		= clock_probe,
	.driver = {
		.name = "rtc",
		.owner = THIS_MODULE,
		.of_match_table = clock_match,
	},
};


/* Probe for the mostek real time clock chip. */
static int __init clock_init(void)
{
	return of_register_driver(&clock_driver, &of_platform_bus_type);
}
/* Must be after subsys_initcall() so that busses are probed.  Must
 * be before device_initcall() because things like the RTC driver
 * need to see the clock registers.
 */
fs_initcall(clock_init);


u32 sbus_do_gettimeoffset(void)
{
	unsigned long val = *master_l10_counter;
	unsigned long usec = (val >> 10) & 0x1fffff;

	/* Limit hit?  */
	if (val & 0x80000000)
		usec += 1000000 / HZ;

	return usec * 1000;
}


u32 arch_gettimeoffset(void)
{
	if (unlikely(!do_arch_gettimeoffset))
		return 0;
	return do_arch_gettimeoffset();
}

static void __init sbus_time_init(void)
{
	do_arch_gettimeoffset = sbus_do_gettimeoffset;

	btfixup();

	sparc_init_timers(timer_interrupt);
}

void __init time_init(void)
{
#ifdef CONFIG_PCI
	extern void pci_time_init(void);
	if (pcic_present()) {
		pci_time_init();
		return;
	}
#endif
	sbus_time_init();
}


static int set_rtc_mmss(unsigned long secs)
{
	struct rtc_device *rtc = rtc_class_open("rtc0");
	int err = -1;

	if (rtc) {
		err = rtc_set_mmss(rtc, secs);
		rtc_class_close(rtc);
	}

	return err;
}