Loading...
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 | /* 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 "xtime_update()" 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
clear_clock_irq();
xtime_update(1);
#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 platform_device *op)
{
struct device_node *dp = op->dev.of_node;
const char *model = of_get_property(dp, "model", NULL);
if (!model)
return -ENODEV;
/* Only the primary RTC has an address property */
if (!of_find_property(dp, "address", NULL))
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 clock_match[] = {
{
.name = "eeprom",
},
{},
};
static struct 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 platform_driver_register(&clock_driver);
}
/* 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_irq_config.init_timers(timer_interrupt);
}
void __init time_init(void)
{
if (pcic_present())
pci_time_init();
else
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;
}
|