David S. Miller | 64d329e | 2007-10-27 00:17:01 -0700 | [diff] [blame] | 1 | /* linux/arch/sparc/kernel/time.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * |
David S. Miller | 64d329e | 2007-10-27 00:17:01 -0700 | [diff] [blame] | 3 | * Copyright (C) 1995 David S. Miller (davem@davemloft.net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
David S. Miller | c4cbe6f | 2008-09-03 15:52:38 -0700 | [diff] [blame] | 26 | #include <linux/rtc.h> |
| 27 | #include <linux/rtc/m48t59.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
David S. Miller | 454eeb2 | 2008-08-27 04:05:35 -0700 | [diff] [blame] | 33 | #include <linux/of.h> |
Stephen Rothwell | 764f257 | 2008-08-07 15:33:36 -0700 | [diff] [blame] | 34 | #include <linux/of_device.h> |
David S. Miller | c4cbe6f | 2008-09-03 15:52:38 -0700 | [diff] [blame] | 35 | #include <linux/platform_device.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
| 37 | #include <asm/oplib.h> |
John Stultz | 0299b13 | 2010-01-15 01:34:28 -0800 | [diff] [blame] | 38 | #include <asm/timex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <asm/timer.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include <asm/page.h> |
| 46 | #include <asm/pcic.h> |
Al Viro | 0d84438 | 2006-10-08 14:30:44 +0100 | [diff] [blame] | 47 | #include <asm/irq_regs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
Al Viro | 32231a6 | 2007-07-21 19:18:57 -0700 | [diff] [blame] | 49 | #include "irq.h" |
| 50 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | DEFINE_SPINLOCK(rtc_lock); |
Sam Ravnborg | 6943f3d | 2009-01-08 16:58:05 -0800 | [diff] [blame] | 52 | EXPORT_SYMBOL(rtc_lock); |
| 53 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | static int set_rtc_mmss(unsigned long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | unsigned 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[]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 && |
David S. Miller | 8a8b836 | 2006-12-17 16:18:47 -0800 | [diff] [blame] | 70 | pc < (unsigned long) __bzero_end)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | pc = regs->u_regs[UREG_RETPC]; |
| 72 | return pc; |
| 73 | } |
| 74 | |
Martin Habets | 9550e59 | 2006-10-17 19:21:48 -0700 | [diff] [blame] | 75 | EXPORT_SYMBOL(profile_pc); |
| 76 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | __volatile__ unsigned int *master_l10_counter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
John Stultz | 0299b13 | 2010-01-15 01:34:28 -0800 | [diff] [blame] | 79 | u32 (*do_arch_gettimeoffset)(void); |
| 80 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | /* |
| 82 | * timer_interrupt() needs to keep up the real-time clock, |
| 83 | * as well as call the "do_timer()" routine every clocktick |
| 84 | */ |
| 85 | |
| 86 | #define TICK_SIZE (tick_nsec / 1000) |
| 87 | |
Jeff Garzik | 5dc0742 | 2007-10-31 05:08:48 -0400 | [diff] [blame] | 88 | static irqreturn_t timer_interrupt(int dummy, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | { |
| 90 | /* last time the cmos clock got updated */ |
| 91 | static long last_rtc_update; |
| 92 | |
| 93 | #ifndef CONFIG_SMP |
Al Viro | 0d84438 | 2006-10-08 14:30:44 +0100 | [diff] [blame] | 94 | profile_tick(CPU_PROFILING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | #endif |
| 96 | |
| 97 | /* Protect counter clear so that do_gettimeoffset works */ |
| 98 | write_seqlock(&xtime_lock); |
Adrian Bunk | 5110bd2 | 2008-08-31 20:59:37 -0700 | [diff] [blame] | 99 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | clear_clock_irq(); |
| 101 | |
Atsushi Nemoto | 3171a03 | 2006-09-29 02:00:32 -0700 | [diff] [blame] | 102 | do_timer(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
| 104 | /* Determine when to update the Mostek clock. */ |
john stultz | b149ee2 | 2005-09-06 15:17:46 -0700 | [diff] [blame] | 105 | if (ntp_synced() && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | xtime.tv_sec > last_rtc_update + 660 && |
| 107 | (xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 && |
| 108 | (xtime.tv_nsec / 1000) <= 500000 + ((unsigned) TICK_SIZE) / 2) { |
| 109 | if (set_rtc_mmss(xtime.tv_sec) == 0) |
| 110 | last_rtc_update = xtime.tv_sec; |
| 111 | else |
| 112 | last_rtc_update = xtime.tv_sec - 600; /* do it again in 60 s */ |
| 113 | } |
| 114 | write_sequnlock(&xtime_lock); |
| 115 | |
Peter Zijlstra | aa02cd2 | 2008-02-13 21:33:16 +0100 | [diff] [blame] | 116 | #ifndef CONFIG_SMP |
| 117 | update_process_times(user_mode(get_irq_regs())); |
| 118 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | return IRQ_HANDLED; |
| 120 | } |
| 121 | |
David S. Miller | c4cbe6f | 2008-09-03 15:52:38 -0700 | [diff] [blame] | 122 | static unsigned char mostek_read_byte(struct device *dev, u32 ofs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | { |
David S. Miller | c4cbe6f | 2008-09-03 15:52:38 -0700 | [diff] [blame] | 124 | struct platform_device *pdev = to_platform_device(dev); |
| 125 | struct m48t59_plat_data *pdata = pdev->dev.platform_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
Krzysztof Helt | 12a9ee3 | 2008-10-29 15:35:24 -0700 | [diff] [blame] | 127 | return readb(pdata->ioaddr + ofs); |
David S. Miller | c4cbe6f | 2008-09-03 15:52:38 -0700 | [diff] [blame] | 128 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | |
David S. Miller | c4cbe6f | 2008-09-03 15:52:38 -0700 | [diff] [blame] | 130 | static void mostek_write_byte(struct device *dev, u32 ofs, u8 val) |
| 131 | { |
| 132 | struct platform_device *pdev = to_platform_device(dev); |
| 133 | struct m48t59_plat_data *pdata = pdev->dev.platform_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
Krzysztof Helt | 12a9ee3 | 2008-10-29 15:35:24 -0700 | [diff] [blame] | 135 | writeb(val, pdata->ioaddr + ofs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | } |
| 137 | |
David S. Miller | c4cbe6f | 2008-09-03 15:52:38 -0700 | [diff] [blame] | 138 | static struct m48t59_plat_data m48t59_data = { |
| 139 | .read_byte = mostek_read_byte, |
| 140 | .write_byte = mostek_write_byte, |
| 141 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | |
David S. Miller | c4cbe6f | 2008-09-03 15:52:38 -0700 | [diff] [blame] | 143 | /* resource is set at runtime */ |
| 144 | static struct platform_device m48t59_rtc = { |
| 145 | .name = "rtc-m48t59", |
| 146 | .id = 0, |
| 147 | .num_resources = 1, |
| 148 | .dev = { |
| 149 | .platform_data = &m48t59_data, |
| 150 | }, |
| 151 | }; |
Bob Breuer | 96ba989 | 2006-07-27 22:08:01 -0700 | [diff] [blame] | 152 | |
David S. Miller | ee5caf0 | 2006-06-29 14:36:52 -0700 | [diff] [blame] | 153 | static int __devinit clock_probe(struct of_device *op, const struct of_device_id *match) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | { |
David S. Miller | ee5caf0 | 2006-06-29 14:36:52 -0700 | [diff] [blame] | 155 | struct device_node *dp = op->node; |
Stephen Rothwell | 8271f04 | 2007-03-29 00:47:23 -0700 | [diff] [blame] | 156 | const char *model = of_get_property(dp, "model", NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | |
David S. Miller | ee5caf0 | 2006-06-29 14:36:52 -0700 | [diff] [blame] | 158 | if (!model) |
| 159 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | |
David S. Miller | c4cbe6f | 2008-09-03 15:52:38 -0700 | [diff] [blame] | 161 | m48t59_rtc.resource = &op->resource[0]; |
David S. Miller | ee5caf0 | 2006-06-29 14:36:52 -0700 | [diff] [blame] | 162 | if (!strcmp(model, "mk48t02")) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | /* Map the clock register io area read-only */ |
David S. Miller | c4cbe6f | 2008-09-03 15:52:38 -0700 | [diff] [blame] | 164 | m48t59_data.ioaddr = of_ioremap(&op->resource[0], 0, |
| 165 | 2048, "rtc-m48t59"); |
| 166 | m48t59_data.type = M48T59RTC_TYPE_M48T02; |
David S. Miller | ee5caf0 | 2006-06-29 14:36:52 -0700 | [diff] [blame] | 167 | } else if (!strcmp(model, "mk48t08")) { |
David S. Miller | c4cbe6f | 2008-09-03 15:52:38 -0700 | [diff] [blame] | 168 | m48t59_data.ioaddr = of_ioremap(&op->resource[0], 0, |
| 169 | 8192, "rtc-m48t59"); |
| 170 | m48t59_data.type = M48T59RTC_TYPE_M48T08; |
David S. Miller | ee5caf0 | 2006-06-29 14:36:52 -0700 | [diff] [blame] | 171 | } else |
| 172 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
David S. Miller | c4cbe6f | 2008-09-03 15:52:38 -0700 | [diff] [blame] | 174 | if (platform_device_register(&m48t59_rtc) < 0) |
| 175 | printk(KERN_ERR "Registering RTC device failed\n"); |
Bob Breuer | 96ba989 | 2006-07-27 22:08:01 -0700 | [diff] [blame] | 176 | |
David S. Miller | ee5caf0 | 2006-06-29 14:36:52 -0700 | [diff] [blame] | 177 | return 0; |
| 178 | } |
| 179 | |
David S. Miller | fd09831 | 2008-08-31 01:23:17 -0700 | [diff] [blame] | 180 | static struct of_device_id __initdata clock_match[] = { |
David S. Miller | ee5caf0 | 2006-06-29 14:36:52 -0700 | [diff] [blame] | 181 | { |
| 182 | .name = "eeprom", |
| 183 | }, |
| 184 | {}, |
| 185 | }; |
| 186 | |
| 187 | static struct of_platform_driver clock_driver = { |
David S. Miller | ee5caf0 | 2006-06-29 14:36:52 -0700 | [diff] [blame] | 188 | .match_table = clock_match, |
| 189 | .probe = clock_probe, |
Stephen Rothwell | a2cd155 | 2007-10-10 23:27:34 -0700 | [diff] [blame] | 190 | .driver = { |
David S. Miller | c4cbe6f | 2008-09-03 15:52:38 -0700 | [diff] [blame] | 191 | .name = "rtc", |
Stephen Rothwell | a2cd155 | 2007-10-10 23:27:34 -0700 | [diff] [blame] | 192 | }, |
David S. Miller | ee5caf0 | 2006-06-29 14:36:52 -0700 | [diff] [blame] | 193 | }; |
| 194 | |
| 195 | |
| 196 | /* Probe for the mostek real time clock chip. */ |
Bob Breuer | 96ba989 | 2006-07-27 22:08:01 -0700 | [diff] [blame] | 197 | static int __init clock_init(void) |
David S. Miller | ee5caf0 | 2006-06-29 14:36:52 -0700 | [diff] [blame] | 198 | { |
Stephen Rothwell | 37b7754 | 2007-04-30 17:43:56 +1000 | [diff] [blame] | 199 | return of_register_driver(&clock_driver, &of_platform_bus_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | } |
Bob Breuer | 96ba989 | 2006-07-27 22:08:01 -0700 | [diff] [blame] | 201 | /* Must be after subsys_initcall() so that busses are probed. Must |
| 202 | * be before device_initcall() because things like the RTC driver |
| 203 | * need to see the clock registers. |
| 204 | */ |
| 205 | fs_initcall(clock_init); |
Bob Breuer | 96ba989 | 2006-07-27 22:08:01 -0700 | [diff] [blame] | 206 | |
John Stultz | 0299b13 | 2010-01-15 01:34:28 -0800 | [diff] [blame] | 207 | |
| 208 | u32 sbus_do_gettimeoffset(void) |
| 209 | { |
| 210 | unsigned long val = *master_l10_counter; |
| 211 | unsigned long usec = (val >> 10) & 0x1fffff; |
| 212 | |
| 213 | /* Limit hit? */ |
| 214 | if (val & 0x80000000) |
| 215 | usec += 1000000 / HZ; |
| 216 | |
| 217 | return usec * 1000; |
| 218 | } |
| 219 | |
| 220 | |
| 221 | u32 arch_gettimeoffset(void) |
| 222 | { |
| 223 | if (unlikely(!do_arch_gettimeoffset)) |
| 224 | return 0; |
| 225 | return do_arch_gettimeoffset(); |
| 226 | } |
| 227 | |
Adrian Bunk | c61c65c | 2008-06-05 11:40:58 -0700 | [diff] [blame] | 228 | static void __init sbus_time_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | { |
John Stultz | 0299b13 | 2010-01-15 01:34:28 -0800 | [diff] [blame] | 230 | do_arch_gettimeoffset = sbus_do_gettimeoffset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | btfixup(); |
| 233 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | sparc_init_timers(timer_interrupt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | } |
| 236 | |
| 237 | void __init time_init(void) |
| 238 | { |
| 239 | #ifdef CONFIG_PCI |
| 240 | extern void pci_time_init(void); |
| 241 | if (pcic_present()) { |
| 242 | pci_time_init(); |
| 243 | return; |
| 244 | } |
| 245 | #endif |
| 246 | sbus_time_init(); |
| 247 | } |
| 248 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | |
David S. Miller | c4cbe6f | 2008-09-03 15:52:38 -0700 | [diff] [blame] | 250 | static int set_rtc_mmss(unsigned long secs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | { |
David S. Miller | c4cbe6f | 2008-09-03 15:52:38 -0700 | [diff] [blame] | 252 | struct rtc_device *rtc = rtc_class_open("rtc0"); |
David S. Miller | ab138c0 | 2008-09-10 13:36:13 -0700 | [diff] [blame] | 253 | int err = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | |
David S. Miller | ab138c0 | 2008-09-10 13:36:13 -0700 | [diff] [blame] | 255 | if (rtc) { |
| 256 | err = rtc_set_mmss(rtc, secs); |
| 257 | rtc_class_close(rtc); |
| 258 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | |
David S. Miller | ab138c0 | 2008-09-10 13:36:13 -0700 | [diff] [blame] | 260 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | } |