arch/sparc/kernel/time_32.c

   1 /* linux/arch/sparc/kernel/time.c
   2  *
   3  * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
   4  * Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
   5  *
   6  * Chris Davis (cdavis@cois.on.ca) 03/27/1998
   7  * Added support for the intersil on the sun4/4200
   8  *
   9  * Gleb Raiko (rajko@mech.math.msu.su) 08/18/1998
  10  * Support for MicroSPARC-IIep, PCI CPU.
  11  *
  12  * This file handles the Sparc specific time handling details.
  13  *
  14  * 1997-09-10   Updated NTP code according to technical memorandum Jan '96
  15  *              "A Kernel Model for Precision Timekeeping" by Dave Mills
  16  */
  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>
  36
  37 #include <asm/oplib.h>
  38 #include <asm/timex.h>
  39 #include <asm/timer.h>
  40 #include <asm/irq.h>
  41 #include <asm/io.h>
  42 #include <asm/idprom.h>
  43 #include <asm/machines.h>
  44 #include <asm/page.h>
  45 #include <asm/pcic.h>
  46 #include <asm/irq_regs.h>
  47
  48 #include "irq.h"
  49
  50 DEFINE_SPINLOCK(rtc_lock);
  51 EXPORT_SYMBOL(rtc_lock);
  52
  53 static int set_rtc_mmss(unsigned long);
  54
  55 unsigned long profile_pc(struct pt_regs *regs)
  56 {
  57         extern char __copy_user_begin[], __copy_user_end[];
  58         extern char __atomic_begin[], __atomic_end[];
  59         extern char __bzero_begin[], __bzero_end[];
  60
  61         unsigned long pc = regs->pc;
  62
  63         if (in_lock_functions(pc) ||
  64             (pc >= (unsigned long) __copy_user_begin &&
  65              pc < (unsigned long) __copy_user_end) ||
  66             (pc >= (unsigned long) __atomic_begin &&
  67              pc < (unsigned long) __atomic_end) ||
  68             (pc >= (unsigned long) __bzero_begin &&
  69              pc < (unsigned long) __bzero_end))
  70                 pc = regs->u_regs[UREG_RETPC];
  71         return pc;
  72 }
  73
  74 EXPORT_SYMBOL(profile_pc);
  75
  76 __volatile__ unsigned int *master_l10_counter;
  77
  78 u32 (*do_arch_gettimeoffset)(void);
  79
  80 int update_persistent_clock(struct timespec now)
  81 {
  82         return set_rtc_mmss(now.tv_sec);
  83 }
  84
  85 /*
  86  * timer_interrupt() needs to keep up the real-time clock,
  87  * as well as call the "xtime_update()" routine every clocktick
  88  */
  89
  90 #define TICK_SIZE (tick_nsec / 1000)
  91
  92 static irqreturn_t timer_interrupt(int dummy, void *dev_id)
  93 {
  94 #ifndef CONFIG_SMP
  95         profile_tick(CPU_PROFILING);
  96 #endif
  97
  98         clear_clock_irq();
  99
 100         xtime_update(1);
 101
 102 #ifndef CONFIG_SMP
 103         update_process_times(user_mode(get_irq_regs()));
 104 #endif
 105         return IRQ_HANDLED;
 106 }
 107
 108 static unsigned char mostek_read_byte(struct device *dev, u32 ofs)
 109 {
 110         struct platform_device *pdev = to_platform_device(dev);
 111         struct m48t59_plat_data *pdata = pdev->dev.platform_data;
 112
 113         return readb(pdata->ioaddr + ofs);
 114 }
 115
 116 static void mostek_write_byte(struct device *dev, u32 ofs, u8 val)
 117 {
 118         struct platform_device *pdev = to_platform_device(dev);
 119         struct m48t59_plat_data *pdata = pdev->dev.platform_data;
 120
 121         writeb(val, pdata->ioaddr + ofs);
 122 }
 123
 124 static struct m48t59_plat_data m48t59_data = {
 125         .read_byte = mostek_read_byte,
 126         .write_byte = mostek_write_byte,
 127 };
 128
 129 /* resource is set at runtime */
 130 static struct platform_device m48t59_rtc = {
 131         .name           = "rtc-m48t59",
 132         .id             = 0,
 133         .num_resources  = 1,
 134         .dev    = {
 135                 .platform_data = &m48t59_data,
 136         },
 137 };
 138
 139 static int __devinit clock_probe(struct platform_device *op)
 140 {
 141         struct device_node *dp = op->dev.of_node;
 142         const char *model = of_get_property(dp, "model", NULL);
 143
 144         if (!model)
 145                 return -ENODEV;
 146
 147         /* Only the primary RTC has an address property */
 148         if (!of_find_property(dp, "address", NULL))
 149                 return -ENODEV;
 150
 151         m48t59_rtc.resource = &op->resource[0];
 152         if (!strcmp(model, "mk48t02")) {
 153                 /* Map the clock register io area read-only */
 154                 m48t59_data.ioaddr = of_ioremap(&op->resource[0], 0,
 155                                                 2048, "rtc-m48t59");
 156                 m48t59_data.type = M48T59RTC_TYPE_M48T02;
 157         } else if (!strcmp(model, "mk48t08")) {
 158                 m48t59_data.ioaddr = of_ioremap(&op->resource[0], 0,
 159                                                 8192, "rtc-m48t59");
 160                 m48t59_data.type = M48T59RTC_TYPE_M48T08;
 161         } else
 162                 return -ENODEV;
 163
 164         if (platform_device_register(&m48t59_rtc) < 0)
 165                 printk(KERN_ERR "Registering RTC device failed\n");
 166
 167         return 0;
 168 }
 169
 170 static struct of_device_id clock_match[] = {
 171         {
 172                 .name = "eeprom",
 173         },
 174         {},
 175 };
 176
 177 static struct platform_driver clock_driver = {
 178         .probe          = clock_probe,
 179         .driver = {
 180                 .name = "rtc",
 181                 .owner = THIS_MODULE,
 182                 .of_match_table = clock_match,
 183         },
 184 };
 185
 186
 187 /* Probe for the mostek real time clock chip. */
 188 static int __init clock_init(void)
 189 {
 190         return platform_driver_register(&clock_driver);
 191 }
 192 /* Must be after subsys_initcall() so that busses are probed.  Must
 193  * be before device_initcall() because things like the RTC driver
 194  * need to see the clock registers.
 195  */
 196 fs_initcall(clock_init);
 197
 198
 199 u32 sbus_do_gettimeoffset(void)
 200 {
 201         unsigned long val = *master_l10_counter;
 202         unsigned long usec = (val >> 10) & 0x1fffff;
 203
 204         /* Limit hit?  */
 205         if (val & 0x80000000)
 206                 usec += 1000000 / HZ;
 207
 208         return usec * 1000;
 209 }
 210
 211
 212 u32 arch_gettimeoffset(void)
 213 {
 214         if (unlikely(!do_arch_gettimeoffset))
 215                 return 0;
 216         return do_arch_gettimeoffset();
 217 }
 218
 219 static void __init sbus_time_init(void)
 220 {
 221         do_arch_gettimeoffset = sbus_do_gettimeoffset;
 222
 223         btfixup();
 224
 225         sparc_irq_config.init_timers(timer_interrupt);
 226 }
 227
 228 void __init time_init(void)
 229 {
 230         if (pcic_present())
 231                 pci_time_init();
 232         else
 233                 sbus_time_init();
 234 }
 235
 236
 237 static int set_rtc_mmss(unsigned long secs)
 238 {
 239         struct rtc_device *rtc = rtc_class_open("rtc0");
 240         int err = -1;
 241
 242         if (rtc) {
 243                 err = rtc_set_mmss(rtc, secs);
 244                 rtc_class_close(rtc);
 245         }
 246
 247         return err;
 248 }