Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Intel & MS High Precision Event Timer Implementation. |
| 3 | * |
| 4 | * Copyright (C) 2003 Intel Corporation |
| 5 | * Venki Pallipadi |
| 6 | * (c) Copyright 2004 Hewlett-Packard Development Company, L.P. |
| 7 | * Bob Picco <robert.picco@hp.com> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 2 as |
| 11 | * published by the Free Software Foundation. |
| 12 | */ |
| 13 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/interrupt.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/types.h> |
| 18 | #include <linux/miscdevice.h> |
| 19 | #include <linux/major.h> |
| 20 | #include <linux/ioport.h> |
| 21 | #include <linux/fcntl.h> |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/poll.h> |
Al Viro | f23f6e0 | 2006-10-20 15:17:02 -0400 | [diff] [blame] | 24 | #include <linux/mm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/proc_fs.h> |
| 26 | #include <linux/spinlock.h> |
| 27 | #include <linux/sysctl.h> |
| 28 | #include <linux/wait.h> |
| 29 | #include <linux/bcd.h> |
| 30 | #include <linux/seq_file.h> |
| 31 | #include <linux/bitops.h> |
Arnd Bergmann | 54066a5 | 2010-03-22 20:55:11 +0100 | [diff] [blame] | 32 | #include <linux/compat.h> |
Tony Luck | 0aa366f | 2007-07-20 11:22:30 -0700 | [diff] [blame] | 33 | #include <linux/clocksource.h> |
Jaswinder Singh Rajput | 0ca0176 | 2010-10-26 14:22:13 -0700 | [diff] [blame] | 34 | #include <linux/uaccess.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 35 | #include <linux/slab.h> |
Jaswinder Singh Rajput | 0ca0176 | 2010-10-26 14:22:13 -0700 | [diff] [blame] | 36 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | #include <asm/current.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <asm/irq.h> |
| 40 | #include <asm/div64.h> |
| 41 | |
| 42 | #include <linux/acpi.h> |
| 43 | #include <acpi/acpi_bus.h> |
| 44 | #include <linux/hpet.h> |
| 45 | |
| 46 | /* |
| 47 | * The High Precision Event Timer driver. |
| 48 | * This driver is closely modelled after the rtc.c driver. |
Denis V. Lunev | e45f2c0 | 2008-11-24 11:28:36 +0300 | [diff] [blame] | 49 | * http://www.intel.com/hardwaredesign/hpetspec_1.pdf |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | */ |
| 51 | #define HPET_USER_FREQ (64) |
| 52 | #define HPET_DRIFT (500) |
| 53 | |
Randy Dunlap | 757c472 | 2005-10-30 15:03:42 -0800 | [diff] [blame] | 54 | #define HPET_RANGE_SIZE 1024 /* from HPET spec */ |
| 55 | |
David Brownell | 64a76f6 | 2008-07-29 12:47:38 -0700 | [diff] [blame] | 56 | |
| 57 | /* WARNING -- don't get confused. These macros are never used |
| 58 | * to write the (single) counter, and rarely to read it. |
| 59 | * They're badly named; to fix, someday. |
| 60 | */ |
Tony Luck | 0aa366f | 2007-07-20 11:22:30 -0700 | [diff] [blame] | 61 | #if BITS_PER_LONG == 64 |
| 62 | #define write_counter(V, MC) writeq(V, MC) |
| 63 | #define read_counter(MC) readq(MC) |
| 64 | #else |
| 65 | #define write_counter(V, MC) writel(V, MC) |
| 66 | #define read_counter(MC) readl(MC) |
| 67 | #endif |
| 68 | |
Arnd Bergmann | 54066a5 | 2010-03-22 20:55:11 +0100 | [diff] [blame] | 69 | static DEFINE_MUTEX(hpet_mutex); /* replaces BKL */ |
Clemens Ladisch | 642d30b | 2005-10-30 15:03:31 -0800 | [diff] [blame] | 70 | static u32 hpet_nhpet, hpet_max_freq = HPET_USER_FREQ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
S.Çağlar Onur | 3dffec4 | 2007-09-26 12:15:33 +0300 | [diff] [blame] | 72 | /* This clocksource driver currently only works on ia64 */ |
| 73 | #ifdef CONFIG_IA64 |
Tony Luck | 0aa366f | 2007-07-20 11:22:30 -0700 | [diff] [blame] | 74 | static void __iomem *hpet_mctr; |
| 75 | |
Magnus Damm | 8e19608 | 2009-04-21 12:24:00 -0700 | [diff] [blame] | 76 | static cycle_t read_hpet(struct clocksource *cs) |
Tony Luck | 0aa366f | 2007-07-20 11:22:30 -0700 | [diff] [blame] | 77 | { |
| 78 | return (cycle_t)read_counter((void __iomem *)hpet_mctr); |
| 79 | } |
| 80 | |
| 81 | static struct clocksource clocksource_hpet = { |
Jaswinder Singh Rajput | 0ca0176 | 2010-10-26 14:22:13 -0700 | [diff] [blame] | 82 | .name = "hpet", |
| 83 | .rating = 250, |
| 84 | .read = read_hpet, |
| 85 | .mask = CLOCKSOURCE_MASK(64), |
Jaswinder Singh Rajput | 0ca0176 | 2010-10-26 14:22:13 -0700 | [diff] [blame] | 86 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
Tony Luck | 0aa366f | 2007-07-20 11:22:30 -0700 | [diff] [blame] | 87 | }; |
| 88 | static struct clocksource *hpet_clocksource; |
S.Çağlar Onur | 3dffec4 | 2007-09-26 12:15:33 +0300 | [diff] [blame] | 89 | #endif |
Tony Luck | 0aa366f | 2007-07-20 11:22:30 -0700 | [diff] [blame] | 90 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | /* A lock for concurrent access by app and isr hpet activity. */ |
| 92 | static DEFINE_SPINLOCK(hpet_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
| 94 | #define HPET_DEV_NAME (7) |
| 95 | |
| 96 | struct hpet_dev { |
| 97 | struct hpets *hd_hpets; |
| 98 | struct hpet __iomem *hd_hpet; |
| 99 | struct hpet_timer __iomem *hd_timer; |
| 100 | unsigned long hd_ireqfreq; |
| 101 | unsigned long hd_irqdata; |
| 102 | wait_queue_head_t hd_waitqueue; |
| 103 | struct fasync_struct *hd_async_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | unsigned int hd_flags; |
| 105 | unsigned int hd_irq; |
| 106 | unsigned int hd_hdwirq; |
| 107 | char hd_name[HPET_DEV_NAME]; |
| 108 | }; |
| 109 | |
| 110 | struct hpets { |
| 111 | struct hpets *hp_next; |
| 112 | struct hpet __iomem *hp_hpet; |
| 113 | unsigned long hp_hpet_phys; |
Tony Luck | 0aa366f | 2007-07-20 11:22:30 -0700 | [diff] [blame] | 114 | struct clocksource *hp_clocksource; |
Clemens Ladisch | ba3f213 | 2005-10-30 15:03:31 -0800 | [diff] [blame] | 115 | unsigned long long hp_tick_freq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | unsigned long hp_delta; |
| 117 | unsigned int hp_ntimer; |
| 118 | unsigned int hp_which; |
| 119 | struct hpet_dev hp_dev[1]; |
| 120 | }; |
| 121 | |
| 122 | static struct hpets *hpets; |
| 123 | |
| 124 | #define HPET_OPEN 0x0001 |
| 125 | #define HPET_IE 0x0002 /* interrupt enabled */ |
| 126 | #define HPET_PERIODIC 0x0004 |
Clemens Ladisch | 0d29086 | 2005-10-30 15:03:34 -0800 | [diff] [blame] | 127 | #define HPET_SHARED_IRQ 0x0008 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | |
| 130 | #ifndef readq |
Adrian Bunk | 887c27f | 2005-09-10 00:26:52 -0700 | [diff] [blame] | 131 | static inline unsigned long long readq(void __iomem *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | { |
| 133 | return readl(addr) | (((unsigned long long)readl(addr + 4)) << 32LL); |
| 134 | } |
| 135 | #endif |
| 136 | |
| 137 | #ifndef writeq |
Adrian Bunk | 887c27f | 2005-09-10 00:26:52 -0700 | [diff] [blame] | 138 | static inline void writeq(unsigned long long v, void __iomem *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | { |
| 140 | writel(v & 0xffffffff, addr); |
| 141 | writel(v >> 32, addr + 4); |
| 142 | } |
| 143 | #endif |
| 144 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 145 | static irqreturn_t hpet_interrupt(int irq, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | { |
| 147 | struct hpet_dev *devp; |
| 148 | unsigned long isr; |
| 149 | |
| 150 | devp = data; |
Clemens Ladisch | 0d29086 | 2005-10-30 15:03:34 -0800 | [diff] [blame] | 151 | isr = 1 << (devp - devp->hd_hpets->hp_dev); |
| 152 | |
| 153 | if ((devp->hd_flags & HPET_SHARED_IRQ) && |
| 154 | !(isr & readl(&devp->hd_hpet->hpet_isr))) |
| 155 | return IRQ_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | |
| 157 | spin_lock(&hpet_lock); |
| 158 | devp->hd_irqdata++; |
| 159 | |
| 160 | /* |
| 161 | * For non-periodic timers, increment the accumulator. |
| 162 | * This has the effect of treating non-periodic like periodic. |
| 163 | */ |
| 164 | if ((devp->hd_flags & (HPET_IE | HPET_PERIODIC)) == HPET_IE) { |
Nils Carlson | 273ef95 | 2011-06-15 15:08:54 -0700 | [diff] [blame] | 165 | unsigned long m, t, mc, base, k; |
| 166 | struct hpet __iomem *hpet = devp->hd_hpet; |
| 167 | struct hpets *hpetp = devp->hd_hpets; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | |
| 169 | t = devp->hd_ireqfreq; |
Nils Carlson | ae21cf9 | 2009-09-23 15:57:13 -0700 | [diff] [blame] | 170 | m = read_counter(&devp->hd_timer->hpet_compare); |
Nils Carlson | 273ef95 | 2011-06-15 15:08:54 -0700 | [diff] [blame] | 171 | mc = read_counter(&hpet->hpet_mc); |
| 172 | /* The time for the next interrupt would logically be t + m, |
| 173 | * however, if we are very unlucky and the interrupt is delayed |
| 174 | * for longer than t then we will completely miss the next |
| 175 | * interrupt if we set t + m and an application will hang. |
| 176 | * Therefore we need to make a more complex computation assuming |
| 177 | * that there exists a k for which the following is true: |
| 178 | * k * t + base < mc + delta |
| 179 | * (k + 1) * t + base > mc + delta |
| 180 | * where t is the interval in hpet ticks for the given freq, |
| 181 | * base is the theoretical start value 0 < base < t, |
| 182 | * mc is the main counter value at the time of the interrupt, |
| 183 | * delta is the time it takes to write the a value to the |
| 184 | * comparator. |
| 185 | * k may then be computed as (mc - base + delta) / t . |
| 186 | */ |
| 187 | base = mc % t; |
| 188 | k = (mc - base + hpetp->hp_delta) / t; |
| 189 | write_counter(t * (k + 1) + base, |
| 190 | &devp->hd_timer->hpet_compare); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | } |
| 192 | |
Clemens Ladisch | 0d29086 | 2005-10-30 15:03:34 -0800 | [diff] [blame] | 193 | if (devp->hd_flags & HPET_SHARED_IRQ) |
| 194 | writel(isr, &devp->hd_hpet->hpet_isr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | spin_unlock(&hpet_lock); |
| 196 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | wake_up_interruptible(&devp->hd_waitqueue); |
| 198 | |
| 199 | kill_fasync(&devp->hd_async_queue, SIGIO, POLL_IN); |
| 200 | |
| 201 | return IRQ_HANDLED; |
| 202 | } |
| 203 | |
Kevin Hao | 70ef6d5 | 2008-05-29 18:41:04 +0800 | [diff] [blame] | 204 | static void hpet_timer_set_irq(struct hpet_dev *devp) |
| 205 | { |
| 206 | unsigned long v; |
| 207 | int irq, gsi; |
| 208 | struct hpet_timer __iomem *timer; |
| 209 | |
| 210 | spin_lock_irq(&hpet_lock); |
| 211 | if (devp->hd_hdwirq) { |
| 212 | spin_unlock_irq(&hpet_lock); |
| 213 | return; |
| 214 | } |
| 215 | |
| 216 | timer = devp->hd_timer; |
| 217 | |
| 218 | /* we prefer level triggered mode */ |
| 219 | v = readl(&timer->hpet_config); |
| 220 | if (!(v & Tn_INT_TYPE_CNF_MASK)) { |
| 221 | v |= Tn_INT_TYPE_CNF_MASK; |
| 222 | writel(v, &timer->hpet_config); |
| 223 | } |
| 224 | spin_unlock_irq(&hpet_lock); |
| 225 | |
| 226 | v = (readq(&timer->hpet_config) & Tn_INT_ROUTE_CAP_MASK) >> |
| 227 | Tn_INT_ROUTE_CAP_SHIFT; |
| 228 | |
| 229 | /* |
| 230 | * In PIC mode, skip IRQ0-4, IRQ6-9, IRQ12-15 which is always used by |
| 231 | * legacy device. In IO APIC mode, we skip all the legacy IRQS. |
| 232 | */ |
| 233 | if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) |
| 234 | v &= ~0xf3df; |
| 235 | else |
| 236 | v &= ~0xffff; |
| 237 | |
Akinobu Mita | e5d6151 | 2010-03-15 00:35:01 -0400 | [diff] [blame] | 238 | for_each_set_bit(irq, &v, HPET_MAX_IRQ) { |
Yinghai Lu | 1f45f56 | 2008-08-19 20:49:49 -0700 | [diff] [blame] | 239 | if (irq >= nr_irqs) { |
Kevin Hao | 70ef6d5 | 2008-05-29 18:41:04 +0800 | [diff] [blame] | 240 | irq = HPET_MAX_IRQ; |
| 241 | break; |
| 242 | } |
| 243 | |
Yinghai Lu | a2f809b | 2009-04-27 18:01:20 -0700 | [diff] [blame] | 244 | gsi = acpi_register_gsi(NULL, irq, ACPI_LEVEL_SENSITIVE, |
Kevin Hao | 70ef6d5 | 2008-05-29 18:41:04 +0800 | [diff] [blame] | 245 | ACPI_ACTIVE_LOW); |
| 246 | if (gsi > 0) |
| 247 | break; |
| 248 | |
| 249 | /* FIXME: Setup interrupt source table */ |
| 250 | } |
| 251 | |
| 252 | if (irq < HPET_MAX_IRQ) { |
| 253 | spin_lock_irq(&hpet_lock); |
| 254 | v = readl(&timer->hpet_config); |
| 255 | v |= irq << Tn_INT_ROUTE_CNF_SHIFT; |
| 256 | writel(v, &timer->hpet_config); |
| 257 | devp->hd_hdwirq = gsi; |
| 258 | spin_unlock_irq(&hpet_lock); |
| 259 | } |
| 260 | return; |
| 261 | } |
| 262 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | static int hpet_open(struct inode *inode, struct file *file) |
| 264 | { |
| 265 | struct hpet_dev *devp; |
| 266 | struct hpets *hpetp; |
| 267 | int i; |
| 268 | |
| 269 | if (file->f_mode & FMODE_WRITE) |
| 270 | return -EINVAL; |
| 271 | |
Arnd Bergmann | 54066a5 | 2010-03-22 20:55:11 +0100 | [diff] [blame] | 272 | mutex_lock(&hpet_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | spin_lock_irq(&hpet_lock); |
| 274 | |
| 275 | for (devp = NULL, hpetp = hpets; hpetp && !devp; hpetp = hpetp->hp_next) |
| 276 | for (i = 0; i < hpetp->hp_ntimer; i++) |
David Brownell | 64a76f6 | 2008-07-29 12:47:38 -0700 | [diff] [blame] | 277 | if (hpetp->hp_dev[i].hd_flags & HPET_OPEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | continue; |
| 279 | else { |
| 280 | devp = &hpetp->hp_dev[i]; |
| 281 | break; |
| 282 | } |
| 283 | |
| 284 | if (!devp) { |
| 285 | spin_unlock_irq(&hpet_lock); |
Arnd Bergmann | 54066a5 | 2010-03-22 20:55:11 +0100 | [diff] [blame] | 286 | mutex_unlock(&hpet_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | return -EBUSY; |
| 288 | } |
| 289 | |
| 290 | file->private_data = devp; |
| 291 | devp->hd_irqdata = 0; |
| 292 | devp->hd_flags |= HPET_OPEN; |
| 293 | spin_unlock_irq(&hpet_lock); |
Arnd Bergmann | 54066a5 | 2010-03-22 20:55:11 +0100 | [diff] [blame] | 294 | mutex_unlock(&hpet_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | |
Kevin Hao | 70ef6d5 | 2008-05-29 18:41:04 +0800 | [diff] [blame] | 296 | hpet_timer_set_irq(devp); |
| 297 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | return 0; |
| 299 | } |
| 300 | |
| 301 | static ssize_t |
| 302 | hpet_read(struct file *file, char __user *buf, size_t count, loff_t * ppos) |
| 303 | { |
| 304 | DECLARE_WAITQUEUE(wait, current); |
| 305 | unsigned long data; |
| 306 | ssize_t retval; |
| 307 | struct hpet_dev *devp; |
| 308 | |
| 309 | devp = file->private_data; |
| 310 | if (!devp->hd_ireqfreq) |
| 311 | return -EIO; |
| 312 | |
| 313 | if (count < sizeof(unsigned long)) |
| 314 | return -EINVAL; |
| 315 | |
| 316 | add_wait_queue(&devp->hd_waitqueue, &wait); |
| 317 | |
| 318 | for ( ; ; ) { |
| 319 | set_current_state(TASK_INTERRUPTIBLE); |
| 320 | |
| 321 | spin_lock_irq(&hpet_lock); |
| 322 | data = devp->hd_irqdata; |
| 323 | devp->hd_irqdata = 0; |
| 324 | spin_unlock_irq(&hpet_lock); |
| 325 | |
| 326 | if (data) |
| 327 | break; |
| 328 | else if (file->f_flags & O_NONBLOCK) { |
| 329 | retval = -EAGAIN; |
| 330 | goto out; |
| 331 | } else if (signal_pending(current)) { |
| 332 | retval = -ERESTARTSYS; |
| 333 | goto out; |
| 334 | } |
| 335 | schedule(); |
| 336 | } |
| 337 | |
| 338 | retval = put_user(data, (unsigned long __user *)buf); |
| 339 | if (!retval) |
| 340 | retval = sizeof(unsigned long); |
| 341 | out: |
| 342 | __set_current_state(TASK_RUNNING); |
| 343 | remove_wait_queue(&devp->hd_waitqueue, &wait); |
| 344 | |
| 345 | return retval; |
| 346 | } |
| 347 | |
| 348 | static unsigned int hpet_poll(struct file *file, poll_table * wait) |
| 349 | { |
| 350 | unsigned long v; |
| 351 | struct hpet_dev *devp; |
| 352 | |
| 353 | devp = file->private_data; |
| 354 | |
| 355 | if (!devp->hd_ireqfreq) |
| 356 | return 0; |
| 357 | |
| 358 | poll_wait(file, &devp->hd_waitqueue, wait); |
| 359 | |
| 360 | spin_lock_irq(&hpet_lock); |
| 361 | v = devp->hd_irqdata; |
| 362 | spin_unlock_irq(&hpet_lock); |
| 363 | |
| 364 | if (v != 0) |
| 365 | return POLLIN | POLLRDNORM; |
| 366 | |
| 367 | return 0; |
| 368 | } |
| 369 | |
| 370 | static int hpet_mmap(struct file *file, struct vm_area_struct *vma) |
| 371 | { |
| 372 | #ifdef CONFIG_HPET_MMAP |
| 373 | struct hpet_dev *devp; |
| 374 | unsigned long addr; |
| 375 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | devp = file->private_data; |
| 377 | addr = devp->hd_hpets->hp_hpet_phys; |
| 378 | |
| 379 | if (addr & (PAGE_SIZE - 1)) |
| 380 | return -ENOSYS; |
| 381 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
Linus Torvalds | 2323036 | 2013-04-19 09:46:39 -0700 | [diff] [blame] | 383 | return vm_iomap_memory(vma, addr, PAGE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | #else |
| 385 | return -ENOSYS; |
| 386 | #endif |
| 387 | } |
| 388 | |
| 389 | static int hpet_fasync(int fd, struct file *file, int on) |
| 390 | { |
| 391 | struct hpet_dev *devp; |
| 392 | |
| 393 | devp = file->private_data; |
| 394 | |
| 395 | if (fasync_helper(fd, file, on, &devp->hd_async_queue) >= 0) |
| 396 | return 0; |
| 397 | else |
| 398 | return -EIO; |
| 399 | } |
| 400 | |
| 401 | static int hpet_release(struct inode *inode, struct file *file) |
| 402 | { |
| 403 | struct hpet_dev *devp; |
| 404 | struct hpet_timer __iomem *timer; |
| 405 | int irq = 0; |
| 406 | |
| 407 | devp = file->private_data; |
| 408 | timer = devp->hd_timer; |
| 409 | |
| 410 | spin_lock_irq(&hpet_lock); |
| 411 | |
| 412 | writeq((readq(&timer->hpet_config) & ~Tn_INT_ENB_CNF_MASK), |
| 413 | &timer->hpet_config); |
| 414 | |
| 415 | irq = devp->hd_irq; |
| 416 | devp->hd_irq = 0; |
| 417 | |
| 418 | devp->hd_ireqfreq = 0; |
| 419 | |
| 420 | if (devp->hd_flags & HPET_PERIODIC |
| 421 | && readq(&timer->hpet_config) & Tn_TYPE_CNF_MASK) { |
| 422 | unsigned long v; |
| 423 | |
| 424 | v = readq(&timer->hpet_config); |
| 425 | v ^= Tn_TYPE_CNF_MASK; |
| 426 | writeq(v, &timer->hpet_config); |
| 427 | } |
| 428 | |
| 429 | devp->hd_flags &= ~(HPET_OPEN | HPET_IE | HPET_PERIODIC); |
| 430 | spin_unlock_irq(&hpet_lock); |
| 431 | |
| 432 | if (irq) |
| 433 | free_irq(irq, devp); |
| 434 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | file->private_data = NULL; |
| 436 | return 0; |
| 437 | } |
| 438 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | static int hpet_ioctl_ieon(struct hpet_dev *devp) |
| 440 | { |
| 441 | struct hpet_timer __iomem *timer; |
| 442 | struct hpet __iomem *hpet; |
| 443 | struct hpets *hpetp; |
| 444 | int irq; |
| 445 | unsigned long g, v, t, m; |
| 446 | unsigned long flags, isr; |
| 447 | |
| 448 | timer = devp->hd_timer; |
| 449 | hpet = devp->hd_hpet; |
| 450 | hpetp = devp->hd_hpets; |
| 451 | |
Clemens Ladisch | 9090e6d | 2005-10-30 15:03:29 -0800 | [diff] [blame] | 452 | if (!devp->hd_ireqfreq) |
| 453 | return -EIO; |
| 454 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | spin_lock_irq(&hpet_lock); |
| 456 | |
| 457 | if (devp->hd_flags & HPET_IE) { |
| 458 | spin_unlock_irq(&hpet_lock); |
| 459 | return -EBUSY; |
| 460 | } |
| 461 | |
| 462 | devp->hd_flags |= HPET_IE; |
Clemens Ladisch | 0d29086 | 2005-10-30 15:03:34 -0800 | [diff] [blame] | 463 | |
| 464 | if (readl(&timer->hpet_config) & Tn_INT_TYPE_CNF_MASK) |
| 465 | devp->hd_flags |= HPET_SHARED_IRQ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | spin_unlock_irq(&hpet_lock); |
| 467 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | irq = devp->hd_hdwirq; |
| 469 | |
| 470 | if (irq) { |
Clemens Ladisch | 0d29086 | 2005-10-30 15:03:34 -0800 | [diff] [blame] | 471 | unsigned long irq_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | |
Clemens Ladisch | 96e9694 | 2010-10-26 14:22:13 -0700 | [diff] [blame] | 473 | if (devp->hd_flags & HPET_SHARED_IRQ) { |
| 474 | /* |
| 475 | * To prevent the interrupt handler from seeing an |
| 476 | * unwanted interrupt status bit, program the timer |
| 477 | * so that it will not fire in the near future ... |
| 478 | */ |
| 479 | writel(readl(&timer->hpet_config) & ~Tn_TYPE_CNF_MASK, |
| 480 | &timer->hpet_config); |
| 481 | write_counter(read_counter(&hpet->hpet_mc), |
| 482 | &timer->hpet_compare); |
| 483 | /* ... and clear any left-over status. */ |
| 484 | isr = 1 << (devp - devp->hd_hpets->hp_dev); |
| 485 | writel(isr, &hpet->hpet_isr); |
| 486 | } |
| 487 | |
Clemens Ladisch | 0d29086 | 2005-10-30 15:03:34 -0800 | [diff] [blame] | 488 | sprintf(devp->hd_name, "hpet%d", (int)(devp - hpetp->hp_dev)); |
| 489 | irq_flags = devp->hd_flags & HPET_SHARED_IRQ |
Thomas Gleixner | 0f2ed4c | 2006-07-01 19:29:33 -0700 | [diff] [blame] | 490 | ? IRQF_SHARED : IRQF_DISABLED; |
Clemens Ladisch | 0d29086 | 2005-10-30 15:03:34 -0800 | [diff] [blame] | 491 | if (request_irq(irq, hpet_interrupt, irq_flags, |
| 492 | devp->hd_name, (void *)devp)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | printk(KERN_ERR "hpet: IRQ %d is not free\n", irq); |
| 494 | irq = 0; |
| 495 | } |
| 496 | } |
| 497 | |
| 498 | if (irq == 0) { |
| 499 | spin_lock_irq(&hpet_lock); |
| 500 | devp->hd_flags ^= HPET_IE; |
| 501 | spin_unlock_irq(&hpet_lock); |
| 502 | return -EIO; |
| 503 | } |
| 504 | |
| 505 | devp->hd_irq = irq; |
| 506 | t = devp->hd_ireqfreq; |
| 507 | v = readq(&timer->hpet_config); |
David Brownell | 64a76f6 | 2008-07-29 12:47:38 -0700 | [diff] [blame] | 508 | |
| 509 | /* 64-bit comparators are not yet supported through the ioctls, |
| 510 | * so force this into 32-bit mode if it supports both modes |
| 511 | */ |
| 512 | g = v | Tn_32MODE_CNF_MASK | Tn_INT_ENB_CNF_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | |
| 514 | if (devp->hd_flags & HPET_PERIODIC) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | g |= Tn_TYPE_CNF_MASK; |
Nils Carlson | ae21cf9 | 2009-09-23 15:57:13 -0700 | [diff] [blame] | 516 | v |= Tn_TYPE_CNF_MASK | Tn_VAL_SET_CNF_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | writeq(v, &timer->hpet_config); |
| 518 | local_irq_save(flags); |
David Brownell | 64a76f6 | 2008-07-29 12:47:38 -0700 | [diff] [blame] | 519 | |
Nils Carlson | ae21cf9 | 2009-09-23 15:57:13 -0700 | [diff] [blame] | 520 | /* |
| 521 | * NOTE: First we modify the hidden accumulator |
David Brownell | 64a76f6 | 2008-07-29 12:47:38 -0700 | [diff] [blame] | 522 | * register supported by periodic-capable comparators. |
| 523 | * We never want to modify the (single) counter; that |
Nils Carlson | ae21cf9 | 2009-09-23 15:57:13 -0700 | [diff] [blame] | 524 | * would affect all the comparators. The value written |
| 525 | * is the counter value when the first interrupt is due. |
David Brownell | 64a76f6 | 2008-07-29 12:47:38 -0700 | [diff] [blame] | 526 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | m = read_counter(&hpet->hpet_mc); |
| 528 | write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare); |
Nils Carlson | ae21cf9 | 2009-09-23 15:57:13 -0700 | [diff] [blame] | 529 | /* |
| 530 | * Then we modify the comparator, indicating the period |
| 531 | * for subsequent interrupt. |
| 532 | */ |
| 533 | write_counter(t, &timer->hpet_compare); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | } else { |
| 535 | local_irq_save(flags); |
| 536 | m = read_counter(&hpet->hpet_mc); |
| 537 | write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare); |
| 538 | } |
| 539 | |
Clemens Ladisch | 0d29086 | 2005-10-30 15:03:34 -0800 | [diff] [blame] | 540 | if (devp->hd_flags & HPET_SHARED_IRQ) { |
Clemens Ladisch | 3d5640d | 2005-10-30 15:03:39 -0800 | [diff] [blame] | 541 | isr = 1 << (devp - devp->hd_hpets->hp_dev); |
Clemens Ladisch | 0d29086 | 2005-10-30 15:03:34 -0800 | [diff] [blame] | 542 | writel(isr, &hpet->hpet_isr); |
| 543 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | writeq(g, &timer->hpet_config); |
| 545 | local_irq_restore(flags); |
| 546 | |
| 547 | return 0; |
| 548 | } |
| 549 | |
Clemens Ladisch | ba3f213 | 2005-10-30 15:03:31 -0800 | [diff] [blame] | 550 | /* converts Hz to number of timer ticks */ |
| 551 | static inline unsigned long hpet_time_div(struct hpets *hpets, |
| 552 | unsigned long dis) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | { |
Clemens Ladisch | ba3f213 | 2005-10-30 15:03:31 -0800 | [diff] [blame] | 554 | unsigned long long m; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | |
Clemens Ladisch | ba3f213 | 2005-10-30 15:03:31 -0800 | [diff] [blame] | 556 | m = hpets->hp_tick_freq + (dis >> 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | do_div(m, dis); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | return (unsigned long)m; |
| 559 | } |
| 560 | |
| 561 | static int |
Arnd Bergmann | 54066a5 | 2010-03-22 20:55:11 +0100 | [diff] [blame] | 562 | hpet_ioctl_common(struct hpet_dev *devp, int cmd, unsigned long arg, |
| 563 | struct hpet_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | { |
| 565 | struct hpet_timer __iomem *timer; |
| 566 | struct hpet __iomem *hpet; |
| 567 | struct hpets *hpetp; |
| 568 | int err; |
| 569 | unsigned long v; |
| 570 | |
| 571 | switch (cmd) { |
| 572 | case HPET_IE_OFF: |
| 573 | case HPET_INFO: |
| 574 | case HPET_EPI: |
| 575 | case HPET_DPI: |
| 576 | case HPET_IRQFREQ: |
| 577 | timer = devp->hd_timer; |
| 578 | hpet = devp->hd_hpet; |
| 579 | hpetp = devp->hd_hpets; |
| 580 | break; |
| 581 | case HPET_IE_ON: |
| 582 | return hpet_ioctl_ieon(devp); |
| 583 | default: |
| 584 | return -EINVAL; |
| 585 | } |
| 586 | |
| 587 | err = 0; |
| 588 | |
| 589 | switch (cmd) { |
| 590 | case HPET_IE_OFF: |
| 591 | if ((devp->hd_flags & HPET_IE) == 0) |
| 592 | break; |
| 593 | v = readq(&timer->hpet_config); |
| 594 | v &= ~Tn_INT_ENB_CNF_MASK; |
| 595 | writeq(v, &timer->hpet_config); |
| 596 | if (devp->hd_irq) { |
| 597 | free_irq(devp->hd_irq, devp); |
| 598 | devp->hd_irq = 0; |
| 599 | } |
| 600 | devp->hd_flags ^= HPET_IE; |
| 601 | break; |
| 602 | case HPET_INFO: |
| 603 | { |
Vasiliy Kulikov | dae512e | 2010-10-26 14:22:15 -0700 | [diff] [blame] | 604 | memset(info, 0, sizeof(*info)); |
Clemens Ladisch | af95ead | 2005-10-30 15:03:38 -0800 | [diff] [blame] | 605 | if (devp->hd_ireqfreq) |
Arnd Bergmann | 54066a5 | 2010-03-22 20:55:11 +0100 | [diff] [blame] | 606 | info->hi_ireqfreq = |
Clemens Ladisch | af95ead | 2005-10-30 15:03:38 -0800 | [diff] [blame] | 607 | hpet_time_div(hpetp, devp->hd_ireqfreq); |
Arnd Bergmann | 54066a5 | 2010-03-22 20:55:11 +0100 | [diff] [blame] | 608 | info->hi_flags = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | readq(&timer->hpet_config) & Tn_PER_INT_CAP_MASK; |
Arnd Bergmann | 54066a5 | 2010-03-22 20:55:11 +0100 | [diff] [blame] | 610 | info->hi_hpet = hpetp->hp_which; |
| 611 | info->hi_timer = devp - hpetp->hp_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | break; |
| 613 | } |
| 614 | case HPET_EPI: |
| 615 | v = readq(&timer->hpet_config); |
| 616 | if ((v & Tn_PER_INT_CAP_MASK) == 0) { |
| 617 | err = -ENXIO; |
| 618 | break; |
| 619 | } |
| 620 | devp->hd_flags |= HPET_PERIODIC; |
| 621 | break; |
| 622 | case HPET_DPI: |
| 623 | v = readq(&timer->hpet_config); |
| 624 | if ((v & Tn_PER_INT_CAP_MASK) == 0) { |
| 625 | err = -ENXIO; |
| 626 | break; |
| 627 | } |
| 628 | if (devp->hd_flags & HPET_PERIODIC && |
| 629 | readq(&timer->hpet_config) & Tn_TYPE_CNF_MASK) { |
| 630 | v = readq(&timer->hpet_config); |
| 631 | v ^= Tn_TYPE_CNF_MASK; |
| 632 | writeq(v, &timer->hpet_config); |
| 633 | } |
| 634 | devp->hd_flags &= ~HPET_PERIODIC; |
| 635 | break; |
| 636 | case HPET_IRQFREQ: |
Arnd Bergmann | 54066a5 | 2010-03-22 20:55:11 +0100 | [diff] [blame] | 637 | if ((arg > hpet_max_freq) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | !capable(CAP_SYS_RESOURCE)) { |
| 639 | err = -EACCES; |
| 640 | break; |
| 641 | } |
| 642 | |
Clemens Ladisch | 189e2dd | 2005-10-30 15:03:33 -0800 | [diff] [blame] | 643 | if (!arg) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | err = -EINVAL; |
| 645 | break; |
| 646 | } |
| 647 | |
Clemens Ladisch | ba3f213 | 2005-10-30 15:03:31 -0800 | [diff] [blame] | 648 | devp->hd_ireqfreq = hpet_time_div(hpetp, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | } |
| 650 | |
| 651 | return err; |
| 652 | } |
| 653 | |
Arnd Bergmann | 54066a5 | 2010-03-22 20:55:11 +0100 | [diff] [blame] | 654 | static long |
| 655 | hpet_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 656 | { |
| 657 | struct hpet_info info; |
| 658 | int err; |
| 659 | |
| 660 | mutex_lock(&hpet_mutex); |
| 661 | err = hpet_ioctl_common(file->private_data, cmd, arg, &info); |
| 662 | mutex_unlock(&hpet_mutex); |
| 663 | |
| 664 | if ((cmd == HPET_INFO) && !err && |
| 665 | (copy_to_user((void __user *)arg, &info, sizeof(info)))) |
| 666 | err = -EFAULT; |
| 667 | |
| 668 | return err; |
| 669 | } |
| 670 | |
| 671 | #ifdef CONFIG_COMPAT |
| 672 | struct compat_hpet_info { |
| 673 | compat_ulong_t hi_ireqfreq; /* Hz */ |
| 674 | compat_ulong_t hi_flags; /* information */ |
| 675 | unsigned short hi_hpet; |
| 676 | unsigned short hi_timer; |
| 677 | }; |
| 678 | |
| 679 | static long |
| 680 | hpet_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 681 | { |
| 682 | struct hpet_info info; |
| 683 | int err; |
| 684 | |
| 685 | mutex_lock(&hpet_mutex); |
| 686 | err = hpet_ioctl_common(file->private_data, cmd, arg, &info); |
| 687 | mutex_unlock(&hpet_mutex); |
| 688 | |
| 689 | if ((cmd == HPET_INFO) && !err) { |
| 690 | struct compat_hpet_info __user *u = compat_ptr(arg); |
| 691 | if (put_user(info.hi_ireqfreq, &u->hi_ireqfreq) || |
| 692 | put_user(info.hi_flags, &u->hi_flags) || |
| 693 | put_user(info.hi_hpet, &u->hi_hpet) || |
| 694 | put_user(info.hi_timer, &u->hi_timer)) |
| 695 | err = -EFAULT; |
| 696 | } |
| 697 | |
| 698 | return err; |
| 699 | } |
| 700 | #endif |
| 701 | |
Arjan van de Ven | 62322d2 | 2006-07-03 00:24:21 -0700 | [diff] [blame] | 702 | static const struct file_operations hpet_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | .owner = THIS_MODULE, |
| 704 | .llseek = no_llseek, |
| 705 | .read = hpet_read, |
| 706 | .poll = hpet_poll, |
Arnd Bergmann | 5592933 | 2010-04-27 00:24:05 +0200 | [diff] [blame] | 707 | .unlocked_ioctl = hpet_ioctl, |
Arnd Bergmann | 54066a5 | 2010-03-22 20:55:11 +0100 | [diff] [blame] | 708 | #ifdef CONFIG_COMPAT |
| 709 | .compat_ioctl = hpet_compat_ioctl, |
| 710 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | .open = hpet_open, |
| 712 | .release = hpet_release, |
| 713 | .fasync = hpet_fasync, |
| 714 | .mmap = hpet_mmap, |
| 715 | }; |
| 716 | |
Randy Dunlap | 3e6716e | 2005-10-30 15:03:44 -0800 | [diff] [blame] | 717 | static int hpet_is_known(struct hpet_data *hdp) |
| 718 | { |
| 719 | struct hpets *hpetp; |
| 720 | |
| 721 | for (hpetp = hpets; hpetp; hpetp = hpetp->hp_next) |
| 722 | if (hpetp->hp_hpet_phys == hdp->hd_phys_address) |
| 723 | return 1; |
| 724 | |
| 725 | return 0; |
| 726 | } |
| 727 | |
Joe Perches | a151427 | 2013-06-13 19:37:35 -0700 | [diff] [blame] | 728 | static struct ctl_table hpet_table[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | .procname = "max-user-freq", |
| 731 | .data = &hpet_max_freq, |
| 732 | .maxlen = sizeof(int), |
| 733 | .mode = 0644, |
Eric W. Biederman | 6d45611 | 2009-11-16 03:11:48 -0800 | [diff] [blame] | 734 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | }, |
Eric W. Biederman | 894d249 | 2009-11-05 14:34:02 -0800 | [diff] [blame] | 736 | {} |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | }; |
| 738 | |
Joe Perches | a151427 | 2013-06-13 19:37:35 -0700 | [diff] [blame] | 739 | static struct ctl_table hpet_root[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | .procname = "hpet", |
| 742 | .maxlen = 0, |
| 743 | .mode = 0555, |
| 744 | .child = hpet_table, |
| 745 | }, |
Eric W. Biederman | 894d249 | 2009-11-05 14:34:02 -0800 | [diff] [blame] | 746 | {} |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | }; |
| 748 | |
Joe Perches | a151427 | 2013-06-13 19:37:35 -0700 | [diff] [blame] | 749 | static struct ctl_table dev_root[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | .procname = "dev", |
| 752 | .maxlen = 0, |
| 753 | .mode = 0555, |
| 754 | .child = hpet_root, |
| 755 | }, |
Eric W. Biederman | 894d249 | 2009-11-05 14:34:02 -0800 | [diff] [blame] | 756 | {} |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | }; |
| 758 | |
| 759 | static struct ctl_table_header *sysctl_header; |
| 760 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | /* |
| 762 | * Adjustment for when arming the timer with |
| 763 | * initial conditions. That is, main counter |
| 764 | * ticks expired before interrupts are enabled. |
| 765 | */ |
| 766 | #define TICK_CALIBRATE (1000UL) |
| 767 | |
Yasunori Goto | 303d379 | 2009-04-02 16:58:31 -0700 | [diff] [blame] | 768 | static unsigned long __hpet_calibrate(struct hpets *hpetp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | { |
| 770 | struct hpet_timer __iomem *timer = NULL; |
| 771 | unsigned long t, m, count, i, flags, start; |
| 772 | struct hpet_dev *devp; |
| 773 | int j; |
| 774 | struct hpet __iomem *hpet; |
| 775 | |
| 776 | for (j = 0, devp = hpetp->hp_dev; j < hpetp->hp_ntimer; j++, devp++) |
| 777 | if ((devp->hd_flags & HPET_OPEN) == 0) { |
| 778 | timer = devp->hd_timer; |
| 779 | break; |
| 780 | } |
| 781 | |
| 782 | if (!timer) |
| 783 | return 0; |
| 784 | |
Clemens Ladisch | 3d5640d | 2005-10-30 15:03:39 -0800 | [diff] [blame] | 785 | hpet = hpetp->hp_hpet; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | t = read_counter(&timer->hpet_compare); |
| 787 | |
| 788 | i = 0; |
Clemens Ladisch | ba3f213 | 2005-10-30 15:03:31 -0800 | [diff] [blame] | 789 | count = hpet_time_div(hpetp, TICK_CALIBRATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | |
| 791 | local_irq_save(flags); |
| 792 | |
| 793 | start = read_counter(&hpet->hpet_mc); |
| 794 | |
| 795 | do { |
| 796 | m = read_counter(&hpet->hpet_mc); |
| 797 | write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare); |
| 798 | } while (i++, (m - start) < count); |
| 799 | |
| 800 | local_irq_restore(flags); |
| 801 | |
| 802 | return (m - start) / i; |
| 803 | } |
| 804 | |
Yasunori Goto | 303d379 | 2009-04-02 16:58:31 -0700 | [diff] [blame] | 805 | static unsigned long hpet_calibrate(struct hpets *hpetp) |
| 806 | { |
Chen Gang | 2cf4e52 | 2012-11-23 17:46:43 +0800 | [diff] [blame] | 807 | unsigned long ret = ~0UL; |
Yasunori Goto | 303d379 | 2009-04-02 16:58:31 -0700 | [diff] [blame] | 808 | unsigned long tmp; |
| 809 | |
| 810 | /* |
| 811 | * Try to calibrate until return value becomes stable small value. |
| 812 | * If SMI interruption occurs in calibration loop, the return value |
| 813 | * will be big. This avoids its impact. |
| 814 | */ |
| 815 | for ( ; ; ) { |
| 816 | tmp = __hpet_calibrate(hpetp); |
| 817 | if (ret <= tmp) |
| 818 | break; |
| 819 | ret = tmp; |
| 820 | } |
| 821 | |
| 822 | return ret; |
| 823 | } |
| 824 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | int hpet_alloc(struct hpet_data *hdp) |
| 826 | { |
Thomas Gleixner | 5761d64 | 2008-04-04 16:26:10 +0200 | [diff] [blame] | 827 | u64 cap, mcfg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | struct hpet_dev *devp; |
Thomas Gleixner | 5761d64 | 2008-04-04 16:26:10 +0200 | [diff] [blame] | 829 | u32 i, ntimer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | struct hpets *hpetp; |
| 831 | size_t siz; |
| 832 | struct hpet __iomem *hpet; |
Jaswinder Singh Rajput | 0ca0176 | 2010-10-26 14:22:13 -0700 | [diff] [blame] | 833 | static struct hpets *last; |
Thomas Gleixner | 5761d64 | 2008-04-04 16:26:10 +0200 | [diff] [blame] | 834 | unsigned long period; |
Clemens Ladisch | ba3f213 | 2005-10-30 15:03:31 -0800 | [diff] [blame] | 835 | unsigned long long temp; |
David Brownell | f92a789 | 2008-07-31 12:59:56 -0700 | [diff] [blame] | 836 | u32 remainder; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | |
| 838 | /* |
| 839 | * hpet_alloc can be called by platform dependent code. |
Randy Dunlap | 3e6716e | 2005-10-30 15:03:44 -0800 | [diff] [blame] | 840 | * If platform dependent code has allocated the hpet that |
| 841 | * ACPI has also reported, then we catch it here. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | */ |
Randy Dunlap | 3e6716e | 2005-10-30 15:03:44 -0800 | [diff] [blame] | 843 | if (hpet_is_known(hdp)) { |
| 844 | printk(KERN_DEBUG "%s: duplicate HPET ignored\n", |
Harvey Harrison | bf9d892 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 845 | __func__); |
Randy Dunlap | 3e6716e | 2005-10-30 15:03:44 -0800 | [diff] [blame] | 846 | return 0; |
| 847 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | |
| 849 | siz = sizeof(struct hpets) + ((hdp->hd_nirqs - 1) * |
| 850 | sizeof(struct hpet_dev)); |
| 851 | |
Randy Dunlap | 3e6716e | 2005-10-30 15:03:44 -0800 | [diff] [blame] | 852 | hpetp = kzalloc(siz, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | |
| 854 | if (!hpetp) |
| 855 | return -ENOMEM; |
| 856 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | hpetp->hp_which = hpet_nhpet++; |
| 858 | hpetp->hp_hpet = hdp->hd_address; |
| 859 | hpetp->hp_hpet_phys = hdp->hd_phys_address; |
| 860 | |
| 861 | hpetp->hp_ntimer = hdp->hd_nirqs; |
Thomas Gleixner | 5761d64 | 2008-04-04 16:26:10 +0200 | [diff] [blame] | 862 | |
| 863 | for (i = 0; i < hdp->hd_nirqs; i++) |
| 864 | hpetp->hp_dev[i].hd_hdwirq = hdp->hd_irq[i]; |
| 865 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | hpet = hpetp->hp_hpet; |
| 867 | |
| 868 | cap = readq(&hpet->hpet_cap); |
| 869 | |
| 870 | ntimer = ((cap & HPET_NUM_TIM_CAP_MASK) >> HPET_NUM_TIM_CAP_SHIFT) + 1; |
| 871 | |
| 872 | if (hpetp->hp_ntimer != ntimer) { |
| 873 | printk(KERN_WARNING "hpet: number irqs doesn't agree" |
| 874 | " with number of timers\n"); |
| 875 | kfree(hpetp); |
| 876 | return -ENODEV; |
| 877 | } |
| 878 | |
| 879 | if (last) |
| 880 | last->hp_next = hpetp; |
| 881 | else |
| 882 | hpets = hpetp; |
| 883 | |
| 884 | last = hpetp; |
| 885 | |
Clemens Ladisch | ba3f213 | 2005-10-30 15:03:31 -0800 | [diff] [blame] | 886 | period = (cap & HPET_COUNTER_CLK_PERIOD_MASK) >> |
| 887 | HPET_COUNTER_CLK_PERIOD_SHIFT; /* fs, 10^-15 */ |
| 888 | temp = 1000000000000000uLL; /* 10^15 femtoseconds per second */ |
| 889 | temp += period >> 1; /* round */ |
| 890 | do_div(temp, period); |
| 891 | hpetp->hp_tick_freq = temp; /* ticks per second */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | |
Andi Kleen | 3034d11 | 2006-09-26 10:52:28 +0200 | [diff] [blame] | 893 | printk(KERN_INFO "hpet%d: at MMIO 0x%lx, IRQ%s", |
| 894 | hpetp->hp_which, hdp->hd_phys_address, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | hpetp->hp_ntimer > 1 ? "s" : ""); |
| 896 | for (i = 0; i < hpetp->hp_ntimer; i++) |
Kay Sievers | 5da527a | 2012-04-03 03:18:23 +0200 | [diff] [blame] | 897 | printk(KERN_CONT "%s %d", i > 0 ? "," : "", hdp->hd_irq[i]); |
| 898 | printk(KERN_CONT "\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | |
David Brownell | f92a789 | 2008-07-31 12:59:56 -0700 | [diff] [blame] | 900 | temp = hpetp->hp_tick_freq; |
| 901 | remainder = do_div(temp, 1000000); |
David Brownell | 64a76f6 | 2008-07-29 12:47:38 -0700 | [diff] [blame] | 902 | printk(KERN_INFO |
| 903 | "hpet%u: %u comparators, %d-bit %u.%06u MHz counter\n", |
| 904 | hpetp->hp_which, hpetp->hp_ntimer, |
| 905 | cap & HPET_COUNTER_SIZE_MASK ? 64 : 32, |
David Brownell | f92a789 | 2008-07-31 12:59:56 -0700 | [diff] [blame] | 906 | (unsigned) temp, remainder); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | |
| 908 | mcfg = readq(&hpet->hpet_config); |
| 909 | if ((mcfg & HPET_ENABLE_CNF_MASK) == 0) { |
| 910 | write_counter(0L, &hpet->hpet_mc); |
| 911 | mcfg |= HPET_ENABLE_CNF_MASK; |
| 912 | writeq(mcfg, &hpet->hpet_config); |
| 913 | } |
| 914 | |
Clemens Ladisch | 642d30b | 2005-10-30 15:03:31 -0800 | [diff] [blame] | 915 | for (i = 0, devp = hpetp->hp_dev; i < hpetp->hp_ntimer; i++, devp++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | struct hpet_timer __iomem *timer; |
| 917 | |
| 918 | timer = &hpet->hpet_timers[devp - hpetp->hp_dev]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | |
| 920 | devp->hd_hpets = hpetp; |
| 921 | devp->hd_hpet = hpet; |
| 922 | devp->hd_timer = timer; |
| 923 | |
| 924 | /* |
| 925 | * If the timer was reserved by platform code, |
| 926 | * then make timer unavailable for opens. |
| 927 | */ |
| 928 | if (hdp->hd_state & (1 << i)) { |
| 929 | devp->hd_flags = HPET_OPEN; |
| 930 | continue; |
| 931 | } |
| 932 | |
| 933 | init_waitqueue_head(&devp->hd_waitqueue); |
| 934 | } |
| 935 | |
| 936 | hpetp->hp_delta = hpet_calibrate(hpetp); |
Tony Luck | 0aa366f | 2007-07-20 11:22:30 -0700 | [diff] [blame] | 937 | |
Linus Torvalds | 3b2b64f | 2007-08-31 20:13:57 -0700 | [diff] [blame] | 938 | /* This clocksource driver currently only works on ia64 */ |
| 939 | #ifdef CONFIG_IA64 |
Tony Luck | 0aa366f | 2007-07-20 11:22:30 -0700 | [diff] [blame] | 940 | if (!hpet_clocksource) { |
| 941 | hpet_mctr = (void __iomem *)&hpetp->hp_hpet->hpet_mc; |
Andy Lutomirski | 574c44f | 2011-07-13 09:24:15 -0400 | [diff] [blame] | 942 | clocksource_hpet.archdata.fsys_mmio = hpet_mctr; |
John Stultz | d60c304 | 2010-04-26 20:20:47 -0700 | [diff] [blame] | 943 | clocksource_register_hz(&clocksource_hpet, hpetp->hp_tick_freq); |
Tony Luck | 0aa366f | 2007-07-20 11:22:30 -0700 | [diff] [blame] | 944 | hpetp->hp_clocksource = &clocksource_hpet; |
| 945 | hpet_clocksource = &clocksource_hpet; |
| 946 | } |
Linus Torvalds | 3b2b64f | 2007-08-31 20:13:57 -0700 | [diff] [blame] | 947 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | |
| 949 | return 0; |
| 950 | } |
| 951 | |
| 952 | static acpi_status hpet_resources(struct acpi_resource *res, void *data) |
| 953 | { |
| 954 | struct hpet_data *hdp; |
| 955 | acpi_status status; |
| 956 | struct acpi_resource_address64 addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | |
| 958 | hdp = data; |
| 959 | |
| 960 | status = acpi_resource_to_address64(res, &addr); |
| 961 | |
| 962 | if (ACPI_SUCCESS(status)) { |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 963 | hdp->hd_phys_address = addr.minimum; |
Bjorn Helgaas | 9224a86 | 2006-03-28 17:04:00 -0500 | [diff] [blame] | 964 | hdp->hd_address = ioremap(addr.minimum, addr.address_length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | |
Randy Dunlap | 3e6716e | 2005-10-30 15:03:44 -0800 | [diff] [blame] | 966 | if (hpet_is_known(hdp)) { |
Randy Dunlap | 3e6716e | 2005-10-30 15:03:44 -0800 | [diff] [blame] | 967 | iounmap(hdp->hd_address); |
Zhao Yakui | 78e1ca4 | 2007-09-20 21:23:13 -0400 | [diff] [blame] | 968 | return AE_ALREADY_EXISTS; |
Randy Dunlap | 3e6716e | 2005-10-30 15:03:44 -0800 | [diff] [blame] | 969 | } |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 970 | } else if (res->type == ACPI_RESOURCE_TYPE_FIXED_MEMORY32) { |
| 971 | struct acpi_resource_fixed_memory32 *fixmem32; |
Randy Dunlap | 757c472 | 2005-10-30 15:03:42 -0800 | [diff] [blame] | 972 | |
| 973 | fixmem32 = &res->data.fixed_memory32; |
| 974 | if (!fixmem32) |
Zhao Yakui | 78e1ca4 | 2007-09-20 21:23:13 -0400 | [diff] [blame] | 975 | return AE_NO_MEMORY; |
Randy Dunlap | 757c472 | 2005-10-30 15:03:42 -0800 | [diff] [blame] | 976 | |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 977 | hdp->hd_phys_address = fixmem32->address; |
| 978 | hdp->hd_address = ioremap(fixmem32->address, |
Randy Dunlap | 757c472 | 2005-10-30 15:03:42 -0800 | [diff] [blame] | 979 | HPET_RANGE_SIZE); |
| 980 | |
Randy Dunlap | 3e6716e | 2005-10-30 15:03:44 -0800 | [diff] [blame] | 981 | if (hpet_is_known(hdp)) { |
Randy Dunlap | 3e6716e | 2005-10-30 15:03:44 -0800 | [diff] [blame] | 982 | iounmap(hdp->hd_address); |
Zhao Yakui | 78e1ca4 | 2007-09-20 21:23:13 -0400 | [diff] [blame] | 983 | return AE_ALREADY_EXISTS; |
Randy Dunlap | 3e6716e | 2005-10-30 15:03:44 -0800 | [diff] [blame] | 984 | } |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 985 | } else if (res->type == ACPI_RESOURCE_TYPE_EXTENDED_IRQ) { |
| 986 | struct acpi_resource_extended_irq *irqp; |
Bjorn Helgaas | be5efff | 2006-02-14 13:53:02 -0800 | [diff] [blame] | 987 | int i, irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | |
| 989 | irqp = &res->data.extended_irq; |
| 990 | |
Bjorn Helgaas | be5efff | 2006-02-14 13:53:02 -0800 | [diff] [blame] | 991 | for (i = 0; i < irqp->interrupt_count; i++) { |
Chen Gang | 2cf4e52 | 2012-11-23 17:46:43 +0800 | [diff] [blame] | 992 | if (hdp->hd_nirqs >= HPET_MAX_TIMERS) |
| 993 | break; |
| 994 | |
Yinghai Lu | a2f809b | 2009-04-27 18:01:20 -0700 | [diff] [blame] | 995 | irq = acpi_register_gsi(NULL, irqp->interrupts[i], |
Bjorn Helgaas | be5efff | 2006-02-14 13:53:02 -0800 | [diff] [blame] | 996 | irqp->triggering, irqp->polarity); |
| 997 | if (irq < 0) |
| 998 | return AE_ERROR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | |
Bjorn Helgaas | be5efff | 2006-02-14 13:53:02 -0800 | [diff] [blame] | 1000 | hdp->hd_irq[hdp->hd_nirqs] = irq; |
| 1001 | hdp->hd_nirqs++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | } |
| 1003 | } |
| 1004 | |
| 1005 | return AE_OK; |
| 1006 | } |
| 1007 | |
| 1008 | static int hpet_acpi_add(struct acpi_device *device) |
| 1009 | { |
| 1010 | acpi_status result; |
| 1011 | struct hpet_data data; |
| 1012 | |
| 1013 | memset(&data, 0, sizeof(data)); |
| 1014 | |
| 1015 | result = |
| 1016 | acpi_walk_resources(device->handle, METHOD_NAME__CRS, |
| 1017 | hpet_resources, &data); |
| 1018 | |
| 1019 | if (ACPI_FAILURE(result)) |
| 1020 | return -ENODEV; |
| 1021 | |
| 1022 | if (!data.hd_address || !data.hd_nirqs) { |
Jiri Slaby | a56d531 | 2010-10-26 14:22:11 -0700 | [diff] [blame] | 1023 | if (data.hd_address) |
| 1024 | iounmap(data.hd_address); |
Harvey Harrison | bf9d892 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 1025 | printk("%s: no address or irqs in _CRS\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | return -ENODEV; |
| 1027 | } |
| 1028 | |
| 1029 | return hpet_alloc(&data); |
| 1030 | } |
| 1031 | |
Rafael J. Wysocki | 51fac83 | 2013-01-24 00:24:48 +0100 | [diff] [blame] | 1032 | static int hpet_acpi_remove(struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | { |
Tony Luck | 0aa366f | 2007-07-20 11:22:30 -0700 | [diff] [blame] | 1034 | /* XXX need to unregister clocksource, dealloc mem, etc */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | return -EINVAL; |
| 1036 | } |
| 1037 | |
Thomas Renninger | 1ba90e3 | 2007-07-23 14:44:41 +0200 | [diff] [blame] | 1038 | static const struct acpi_device_id hpet_device_ids[] = { |
| 1039 | {"PNP0103", 0}, |
| 1040 | {"", 0}, |
| 1041 | }; |
| 1042 | MODULE_DEVICE_TABLE(acpi, hpet_device_ids); |
| 1043 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | static struct acpi_driver hpet_acpi_driver = { |
| 1045 | .name = "hpet", |
Thomas Renninger | 1ba90e3 | 2007-07-23 14:44:41 +0200 | [diff] [blame] | 1046 | .ids = hpet_device_ids, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | .ops = { |
| 1048 | .add = hpet_acpi_add, |
| 1049 | .remove = hpet_acpi_remove, |
| 1050 | }, |
| 1051 | }; |
| 1052 | |
| 1053 | static struct miscdevice hpet_misc = { HPET_MINOR, "hpet", &hpet_fops }; |
| 1054 | |
| 1055 | static int __init hpet_init(void) |
| 1056 | { |
| 1057 | int result; |
| 1058 | |
| 1059 | result = misc_register(&hpet_misc); |
| 1060 | if (result < 0) |
| 1061 | return -ENODEV; |
| 1062 | |
Eric W. Biederman | 0b4d414 | 2007-02-14 00:34:09 -0800 | [diff] [blame] | 1063 | sysctl_header = register_sysctl_table(dev_root); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | |
| 1065 | result = acpi_bus_register_driver(&hpet_acpi_driver); |
| 1066 | if (result < 0) { |
| 1067 | if (sysctl_header) |
| 1068 | unregister_sysctl_table(sysctl_header); |
| 1069 | misc_deregister(&hpet_misc); |
| 1070 | return result; |
| 1071 | } |
| 1072 | |
| 1073 | return 0; |
| 1074 | } |
| 1075 | |
| 1076 | static void __exit hpet_exit(void) |
| 1077 | { |
| 1078 | acpi_bus_unregister_driver(&hpet_acpi_driver); |
| 1079 | |
| 1080 | if (sysctl_header) |
| 1081 | unregister_sysctl_table(sysctl_header); |
| 1082 | misc_deregister(&hpet_misc); |
| 1083 | |
| 1084 | return; |
| 1085 | } |
| 1086 | |
| 1087 | module_init(hpet_init); |
| 1088 | module_exit(hpet_exit); |
| 1089 | MODULE_AUTHOR("Bob Picco <Robert.Picco@hp.com>"); |
| 1090 | MODULE_LICENSE("GPL"); |