Merge remote branch 'origin' into secretlab/next-devicetree
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / arch / sparc / kernel / time_32.c
blobe404b063be2cbc1d141c899c2e91f1ad79463989
1 /* linux/arch/sparc/kernel/time.c
3 * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
4 * Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
6 * Chris Davis (cdavis@cois.on.ca) 03/27/1998
7 * Added support for the intersil on the sun4/4200
9 * Gleb Raiko (rajko@mech.math.msu.su) 08/18/1998
10 * Support for MicroSPARC-IIep, PCI CPU.
12 * This file handles the Sparc specific time handling details.
14 * 1997-09-10 Updated NTP code according to technical memorandum Jan '96
15 * "A Kernel Model for Precision Timekeeping" by Dave Mills
17 #include <linux/errno.h>
18 #include <linux/module.h>
19 #include <linux/sched.h>
20 #include <linux/kernel.h>
21 #include <linux/param.h>
22 #include <linux/string.h>
23 #include <linux/mm.h>
24 #include <linux/interrupt.h>
25 #include <linux/time.h>
26 #include <linux/rtc.h>
27 #include <linux/rtc/m48t59.h>
28 #include <linux/timex.h>
29 #include <linux/init.h>
30 #include <linux/pci.h>
31 #include <linux/ioport.h>
32 #include <linux/profile.h>
33 #include <linux/of.h>
34 #include <linux/of_device.h>
35 #include <linux/platform_device.h>
37 #include <asm/oplib.h>
38 #include <asm/timex.h>
39 #include <asm/timer.h>
40 #include <asm/system.h>
41 #include <asm/irq.h>
42 #include <asm/io.h>
43 #include <asm/idprom.h>
44 #include <asm/machines.h>
45 #include <asm/page.h>
46 #include <asm/pcic.h>
47 #include <asm/irq_regs.h>
49 #include "irq.h"
51 DEFINE_SPINLOCK(rtc_lock);
52 EXPORT_SYMBOL(rtc_lock);
54 static int set_rtc_mmss(unsigned long);
56 unsigned long profile_pc(struct pt_regs *regs)
58 extern char __copy_user_begin[], __copy_user_end[];
59 extern char __atomic_begin[], __atomic_end[];
60 extern char __bzero_begin[], __bzero_end[];
62 unsigned long pc = regs->pc;
64 if (in_lock_functions(pc) ||
65 (pc >= (unsigned long) __copy_user_begin &&
66 pc < (unsigned long) __copy_user_end) ||
67 (pc >= (unsigned long) __atomic_begin &&
68 pc < (unsigned long) __atomic_end) ||
69 (pc >= (unsigned long) __bzero_begin &&
70 pc < (unsigned long) __bzero_end))
71 pc = regs->u_regs[UREG_RETPC];
72 return pc;
75 EXPORT_SYMBOL(profile_pc);
77 __volatile__ unsigned int *master_l10_counter;
79 u32 (*do_arch_gettimeoffset)(void);
81 int update_persistent_clock(struct timespec now)
83 return set_rtc_mmss(now.tv_sec);
87 * timer_interrupt() needs to keep up the real-time clock,
88 * as well as call the "do_timer()" routine every clocktick
91 #define TICK_SIZE (tick_nsec / 1000)
93 static irqreturn_t timer_interrupt(int dummy, void *dev_id)
95 #ifndef CONFIG_SMP
96 profile_tick(CPU_PROFILING);
97 #endif
99 /* Protect counter clear so that do_gettimeoffset works */
100 write_seqlock(&xtime_lock);
102 clear_clock_irq();
104 do_timer(1);
106 write_sequnlock(&xtime_lock);
108 #ifndef CONFIG_SMP
109 update_process_times(user_mode(get_irq_regs()));
110 #endif
111 return IRQ_HANDLED;
114 static unsigned char mostek_read_byte(struct device *dev, u32 ofs)
116 struct platform_device *pdev = to_platform_device(dev);
117 struct m48t59_plat_data *pdata = pdev->dev.platform_data;
119 return readb(pdata->ioaddr + ofs);
122 static void mostek_write_byte(struct device *dev, u32 ofs, u8 val)
124 struct platform_device *pdev = to_platform_device(dev);
125 struct m48t59_plat_data *pdata = pdev->dev.platform_data;
127 writeb(val, pdata->ioaddr + ofs);
130 static struct m48t59_plat_data m48t59_data = {
131 .read_byte = mostek_read_byte,
132 .write_byte = mostek_write_byte,
135 /* resource is set at runtime */
136 static struct platform_device m48t59_rtc = {
137 .name = "rtc-m48t59",
138 .id = 0,
139 .num_resources = 1,
140 .dev = {
141 .platform_data = &m48t59_data,
145 static int __devinit clock_probe(struct of_device *op, const struct of_device_id *match)
147 struct device_node *dp = op->dev.of_node;
148 const char *model = of_get_property(dp, "model", NULL);
150 if (!model)
151 return -ENODEV;
153 m48t59_rtc.resource = &op->resource[0];
154 if (!strcmp(model, "mk48t02")) {
155 /* Map the clock register io area read-only */
156 m48t59_data.ioaddr = of_ioremap(&op->resource[0], 0,
157 2048, "rtc-m48t59");
158 m48t59_data.type = M48T59RTC_TYPE_M48T02;
159 } else if (!strcmp(model, "mk48t08")) {
160 m48t59_data.ioaddr = of_ioremap(&op->resource[0], 0,
161 8192, "rtc-m48t59");
162 m48t59_data.type = M48T59RTC_TYPE_M48T08;
163 } else
164 return -ENODEV;
166 if (platform_device_register(&m48t59_rtc) < 0)
167 printk(KERN_ERR "Registering RTC device failed\n");
169 return 0;
172 static struct of_device_id __initdata clock_match[] = {
174 .name = "eeprom",
179 static struct of_platform_driver clock_driver = {
180 .probe = clock_probe,
181 .driver = {
182 .name = "rtc",
183 .owner = THIS_MODULE,
184 .of_match_table = clock_match,
189 /* Probe for the mostek real time clock chip. */
190 static int __init clock_init(void)
192 return of_register_driver(&clock_driver, &of_platform_bus_type);
194 /* Must be after subsys_initcall() so that busses are probed. Must
195 * be before device_initcall() because things like the RTC driver
196 * need to see the clock registers.
198 fs_initcall(clock_init);
201 u32 sbus_do_gettimeoffset(void)
203 unsigned long val = *master_l10_counter;
204 unsigned long usec = (val >> 10) & 0x1fffff;
206 /* Limit hit? */
207 if (val & 0x80000000)
208 usec += 1000000 / HZ;
210 return usec * 1000;
214 u32 arch_gettimeoffset(void)
216 if (unlikely(!do_arch_gettimeoffset))
217 return 0;
218 return do_arch_gettimeoffset();
221 static void __init sbus_time_init(void)
223 do_arch_gettimeoffset = sbus_do_gettimeoffset;
225 btfixup();
227 sparc_init_timers(timer_interrupt);
230 void __init time_init(void)
232 #ifdef CONFIG_PCI
233 extern void pci_time_init(void);
234 if (pcic_present()) {
235 pci_time_init();
236 return;
238 #endif
239 sbus_time_init();
243 static int set_rtc_mmss(unsigned long secs)
245 struct rtc_device *rtc = rtc_class_open("rtc0");
246 int err = -1;
248 if (rtc) {
249 err = rtc_set_mmss(rtc, secs);
250 rtc_class_close(rtc);
253 return err;