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/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> 48 49#include "irq.h" 50 51DEFINE_SPINLOCK(rtc_lock); 52EXPORT_SYMBOL(rtc_lock); 53 54static int set_rtc_mmss(unsigned long); 55 56unsigned long profile_pc(struct pt_regs *regs) 57{ 58 extern char __copy_user_begin[], __copy_user_end[]; 59 extern char __atomic_begin[], __atomic_end[]; 60 extern char __bzero_begin[], __bzero_end[]; 61 62 unsigned long pc = regs->pc; 63 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; 73} 74 75EXPORT_SYMBOL(profile_pc); 76 77__volatile__ unsigned int *master_l10_counter; 78 79u32 (*do_arch_gettimeoffset)(void); 80 81int update_persistent_clock(struct timespec now) 82{ 83 return set_rtc_mmss(now.tv_sec); 84} 85 86/* 87 * timer_interrupt() needs to keep up the real-time clock, 88 * as well as call the "do_timer()" routine every clocktick 89 */ 90 91#define TICK_SIZE (tick_nsec / 1000) 92 93static irqreturn_t timer_interrupt(int dummy, void *dev_id) 94{ 95#ifndef CONFIG_SMP 96 profile_tick(CPU_PROFILING); 97#endif 98 99 /* Protect counter clear so that do_gettimeoffset works */ 100 write_seqlock(&xtime_lock); 101 102 clear_clock_irq(); 103 104 do_timer(1); 105 106 write_sequnlock(&xtime_lock); 107 108#ifndef CONFIG_SMP 109 update_process_times(user_mode(get_irq_regs())); 110#endif 111 return IRQ_HANDLED; 112} 113 114static unsigned char mostek_read_byte(struct device *dev, u32 ofs) 115{ 116 struct platform_device *pdev = to_platform_device(dev); 117 struct m48t59_plat_data *pdata = pdev->dev.platform_data; 118 119 return readb(pdata->ioaddr + ofs); 120} 121 122static void mostek_write_byte(struct device *dev, u32 ofs, u8 val) 123{ 124 struct platform_device *pdev = to_platform_device(dev); 125 struct m48t59_plat_data *pdata = pdev->dev.platform_data; 126 127 writeb(val, pdata->ioaddr + ofs); 128} 129 130static struct m48t59_plat_data m48t59_data = { 131 .read_byte = mostek_read_byte, 132 .write_byte = mostek_write_byte, 133}; 134 135/* resource is set at runtime */ 136static struct platform_device m48t59_rtc = { 137 .name = "rtc-m48t59", 138 .id = 0, 139 .num_resources = 1, 140 .dev = { 141 .platform_data = &m48t59_data, 142 }, 143}; 144 145static int __devinit clock_probe(struct platform_device *op, const struct of_device_id *match) 146{ 147 struct device_node *dp = op->dev.of_node; 148 const char *model = of_get_property(dp, "model", NULL); 149 150 if (!model) 151 return -ENODEV; 152 153 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; 165 166 if (platform_device_register(&m48t59_rtc) < 0) 167 printk(KERN_ERR "Registering RTC device failed\n"); 168 169 return 0; 170} 171 172static struct of_device_id __initdata clock_match[] = { 173 { 174 .name = "eeprom", 175 }, 176 {}, 177}; 178 179static 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, 185 }, 186}; 187 188 189/* Probe for the mostek real time clock chip. */ 190static int __init clock_init(void) 191{ 192 return of_register_platform_driver(&clock_driver); 193} 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. 197 */ 198fs_initcall(clock_init); 199 200 201u32 sbus_do_gettimeoffset(void) 202{ 203 unsigned long val = *master_l10_counter; 204 unsigned long usec = (val >> 10) & 0x1fffff; 205 206 /* Limit hit? */ 207 if (val & 0x80000000) 208 usec += 1000000 / HZ; 209 210 return usec * 1000; 211} 212 213 214u32 arch_gettimeoffset(void) 215{ 216 if (unlikely(!do_arch_gettimeoffset)) 217 return 0; 218 return do_arch_gettimeoffset(); 219} 220 221static void __init sbus_time_init(void) 222{ 223 do_arch_gettimeoffset = sbus_do_gettimeoffset; 224 225 btfixup(); 226 227 sparc_init_timers(timer_interrupt); 228} 229 230void __init time_init(void) 231{ 232#ifdef CONFIG_PCI 233 extern void pci_time_init(void); 234 if (pcic_present()) { 235 pci_time_init(); 236 return; 237 } 238#endif 239 sbus_time_init(); 240} 241 242 243static int set_rtc_mmss(unsigned long secs) 244{ 245 struct rtc_device *rtc = rtc_class_open("rtc0"); 246 int err = -1; 247 248 if (rtc) { 249 err = rtc_set_mmss(rtc, secs); 250 rtc_class_close(rtc); 251 } 252 253 return err; 254} 255