john stultz | 5d0cf41 | 2006-06-26 00:25:12 -0700 | [diff] [blame] | 1 | #include <linux/clocksource.h> |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 2 | #include <linux/clockchips.h> |
Ingo Molnar | 4588c1f | 2008-09-06 14:19:17 +0200 | [diff] [blame] | 3 | #include <linux/interrupt.h> |
| 4 | #include <linux/sysdev.h> |
Thomas Gleixner | 2876914 | 2007-10-12 23:04:06 +0200 | [diff] [blame] | 5 | #include <linux/delay.h> |
john stultz | 5d0cf41 | 2006-06-26 00:25:12 -0700 | [diff] [blame] | 6 | #include <linux/errno.h> |
| 7 | #include <linux/hpet.h> |
| 8 | #include <linux/init.h> |
venkatesh.pallipadi@intel.com | 58ac1e7 | 2008-09-05 18:02:17 -0700 | [diff] [blame] | 9 | #include <linux/cpu.h> |
Ingo Molnar | 4588c1f | 2008-09-06 14:19:17 +0200 | [diff] [blame] | 10 | #include <linux/pm.h> |
| 11 | #include <linux/io.h> |
john stultz | 5d0cf41 | 2006-06-26 00:25:12 -0700 | [diff] [blame] | 12 | |
Thomas Gleixner | 2876914 | 2007-10-12 23:04:06 +0200 | [diff] [blame] | 13 | #include <asm/fixmap.h> |
Thomas Gleixner | 06a24de | 2007-10-12 23:04:06 +0200 | [diff] [blame] | 14 | #include <asm/i8253.h> |
Ingo Molnar | 4588c1f | 2008-09-06 14:19:17 +0200 | [diff] [blame] | 15 | #include <asm/hpet.h> |
john stultz | 5d0cf41 | 2006-06-26 00:25:12 -0700 | [diff] [blame] | 16 | |
Ingo Molnar | 4588c1f | 2008-09-06 14:19:17 +0200 | [diff] [blame] | 17 | #define HPET_MASK CLOCKSOURCE_MASK(32) |
| 18 | #define HPET_SHIFT 22 |
john stultz | 5d0cf41 | 2006-06-26 00:25:12 -0700 | [diff] [blame] | 19 | |
Pavel Machek | b10db7f | 2008-01-30 13:30:00 +0100 | [diff] [blame] | 20 | /* FSEC = 10^-15 |
| 21 | NSEC = 10^-9 */ |
Ingo Molnar | 4588c1f | 2008-09-06 14:19:17 +0200 | [diff] [blame] | 22 | #define FSEC_PER_NSEC 1000000L |
john stultz | 5d0cf41 | 2006-06-26 00:25:12 -0700 | [diff] [blame] | 23 | |
venkatesh.pallipadi@intel.com | 26afe5f | 2008-09-05 18:02:18 -0700 | [diff] [blame] | 24 | #define HPET_DEV_USED_BIT 2 |
| 25 | #define HPET_DEV_USED (1 << HPET_DEV_USED_BIT) |
| 26 | #define HPET_DEV_VALID 0x8 |
| 27 | #define HPET_DEV_FSB_CAP 0x1000 |
| 28 | #define HPET_DEV_PERI_CAP 0x2000 |
| 29 | |
| 30 | #define EVT_TO_HPET_DEV(evt) container_of(evt, struct hpet_dev, evt) |
| 31 | |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 32 | /* |
| 33 | * HPET address is set in acpi/boot.c, when an ACPI entry exists |
| 34 | */ |
Ingo Molnar | 4588c1f | 2008-09-06 14:19:17 +0200 | [diff] [blame] | 35 | unsigned long hpet_address; |
Ingo Molnar | e951e4a | 2008-11-25 08:42:01 +0100 | [diff] [blame] | 36 | #ifdef CONFIG_PCI_MSI |
Hannes Eder | 3b71e9e | 2008-11-23 20:19:33 +0100 | [diff] [blame] | 37 | static unsigned long hpet_num_timers; |
Ingo Molnar | e951e4a | 2008-11-25 08:42:01 +0100 | [diff] [blame] | 38 | #endif |
Ingo Molnar | 4588c1f | 2008-09-06 14:19:17 +0200 | [diff] [blame] | 39 | static void __iomem *hpet_virt_address; |
john stultz | 5d0cf41 | 2006-06-26 00:25:12 -0700 | [diff] [blame] | 40 | |
venkatesh.pallipadi@intel.com | 58ac1e7 | 2008-09-05 18:02:17 -0700 | [diff] [blame] | 41 | struct hpet_dev { |
Ingo Molnar | 4588c1f | 2008-09-06 14:19:17 +0200 | [diff] [blame] | 42 | struct clock_event_device evt; |
| 43 | unsigned int num; |
| 44 | int cpu; |
| 45 | unsigned int irq; |
| 46 | unsigned int flags; |
| 47 | char name[10]; |
venkatesh.pallipadi@intel.com | 58ac1e7 | 2008-09-05 18:02:17 -0700 | [diff] [blame] | 48 | }; |
| 49 | |
Chris Wright | 31c435d | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 50 | unsigned long hpet_readl(unsigned long a) |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 51 | { |
| 52 | return readl(hpet_virt_address + a); |
| 53 | } |
| 54 | |
| 55 | static inline void hpet_writel(unsigned long d, unsigned long a) |
| 56 | { |
| 57 | writel(d, hpet_virt_address + a); |
| 58 | } |
| 59 | |
Thomas Gleixner | 2876914 | 2007-10-12 23:04:06 +0200 | [diff] [blame] | 60 | #ifdef CONFIG_X86_64 |
Thomas Gleixner | 2876914 | 2007-10-12 23:04:06 +0200 | [diff] [blame] | 61 | #include <asm/pgtable.h> |
Yinghai Lu | 2387ce5 | 2008-07-13 14:50:56 -0700 | [diff] [blame] | 62 | #endif |
Thomas Gleixner | 2876914 | 2007-10-12 23:04:06 +0200 | [diff] [blame] | 63 | |
Thomas Gleixner | 06a24de | 2007-10-12 23:04:06 +0200 | [diff] [blame] | 64 | static inline void hpet_set_mapping(void) |
| 65 | { |
| 66 | hpet_virt_address = ioremap_nocache(hpet_address, HPET_MMAP_SIZE); |
Yinghai Lu | 2387ce5 | 2008-07-13 14:50:56 -0700 | [diff] [blame] | 67 | #ifdef CONFIG_X86_64 |
| 68 | __set_fixmap(VSYSCALL_HPET, hpet_address, PAGE_KERNEL_VSYSCALL_NOCACHE); |
| 69 | #endif |
Thomas Gleixner | 06a24de | 2007-10-12 23:04:06 +0200 | [diff] [blame] | 70 | } |
| 71 | |
| 72 | static inline void hpet_clear_mapping(void) |
| 73 | { |
| 74 | iounmap(hpet_virt_address); |
| 75 | hpet_virt_address = NULL; |
| 76 | } |
| 77 | |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 78 | /* |
| 79 | * HPET command line enable / disable |
| 80 | */ |
| 81 | static int boot_hpet_disable; |
Thomas Gleixner | b17530b | 2007-10-19 20:35:02 +0200 | [diff] [blame] | 82 | int hpet_force_user; |
Andreas Herrmann | b98103a | 2009-02-21 00:09:47 +0100 | [diff] [blame] | 83 | static int hpet_verbose; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 84 | |
Ingo Molnar | 4588c1f | 2008-09-06 14:19:17 +0200 | [diff] [blame] | 85 | static int __init hpet_setup(char *str) |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 86 | { |
| 87 | if (str) { |
| 88 | if (!strncmp("disable", str, 7)) |
| 89 | boot_hpet_disable = 1; |
Thomas Gleixner | b17530b | 2007-10-19 20:35:02 +0200 | [diff] [blame] | 90 | if (!strncmp("force", str, 5)) |
| 91 | hpet_force_user = 1; |
Andreas Herrmann | b98103a | 2009-02-21 00:09:47 +0100 | [diff] [blame] | 92 | if (!strncmp("verbose", str, 7)) |
| 93 | hpet_verbose = 1; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 94 | } |
| 95 | return 1; |
| 96 | } |
| 97 | __setup("hpet=", hpet_setup); |
| 98 | |
Thomas Gleixner | 2876914 | 2007-10-12 23:04:06 +0200 | [diff] [blame] | 99 | static int __init disable_hpet(char *str) |
| 100 | { |
| 101 | boot_hpet_disable = 1; |
| 102 | return 1; |
| 103 | } |
| 104 | __setup("nohpet", disable_hpet); |
| 105 | |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 106 | static inline int is_hpet_capable(void) |
| 107 | { |
Ingo Molnar | 4588c1f | 2008-09-06 14:19:17 +0200 | [diff] [blame] | 108 | return !boot_hpet_disable && hpet_address; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 109 | } |
| 110 | |
| 111 | /* |
| 112 | * HPET timer interrupt enable / disable |
| 113 | */ |
| 114 | static int hpet_legacy_int_enabled; |
| 115 | |
| 116 | /** |
| 117 | * is_hpet_enabled - check whether the hpet timer interrupt is enabled |
| 118 | */ |
| 119 | int is_hpet_enabled(void) |
| 120 | { |
| 121 | return is_hpet_capable() && hpet_legacy_int_enabled; |
| 122 | } |
Bernhard Walle | 1bdbdaa | 2008-01-30 13:33:28 +0100 | [diff] [blame] | 123 | EXPORT_SYMBOL_GPL(is_hpet_enabled); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 124 | |
Andreas Herrmann | b98103a | 2009-02-21 00:09:47 +0100 | [diff] [blame] | 125 | static void _hpet_print_config(const char *function, int line) |
| 126 | { |
| 127 | u32 i, timers, l, h; |
| 128 | printk(KERN_INFO "hpet: %s(%d):\n", function, line); |
| 129 | l = hpet_readl(HPET_ID); |
| 130 | h = hpet_readl(HPET_PERIOD); |
| 131 | timers = ((l & HPET_ID_NUMBER) >> HPET_ID_NUMBER_SHIFT) + 1; |
| 132 | printk(KERN_INFO "hpet: ID: 0x%x, PERIOD: 0x%x\n", l, h); |
| 133 | l = hpet_readl(HPET_CFG); |
| 134 | h = hpet_readl(HPET_STATUS); |
| 135 | printk(KERN_INFO "hpet: CFG: 0x%x, STATUS: 0x%x\n", l, h); |
| 136 | l = hpet_readl(HPET_COUNTER); |
| 137 | h = hpet_readl(HPET_COUNTER+4); |
| 138 | printk(KERN_INFO "hpet: COUNTER_l: 0x%x, COUNTER_h: 0x%x\n", l, h); |
| 139 | |
| 140 | for (i = 0; i < timers; i++) { |
| 141 | l = hpet_readl(HPET_Tn_CFG(i)); |
| 142 | h = hpet_readl(HPET_Tn_CFG(i)+4); |
| 143 | printk(KERN_INFO "hpet: T%d: CFG_l: 0x%x, CFG_h: 0x%x\n", |
| 144 | i, l, h); |
| 145 | l = hpet_readl(HPET_Tn_CMP(i)); |
| 146 | h = hpet_readl(HPET_Tn_CMP(i)+4); |
| 147 | printk(KERN_INFO "hpet: T%d: CMP_l: 0x%x, CMP_h: 0x%x\n", |
| 148 | i, l, h); |
| 149 | l = hpet_readl(HPET_Tn_ROUTE(i)); |
| 150 | h = hpet_readl(HPET_Tn_ROUTE(i)+4); |
| 151 | printk(KERN_INFO "hpet: T%d ROUTE_l: 0x%x, ROUTE_h: 0x%x\n", |
| 152 | i, l, h); |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | #define hpet_print_config() \ |
| 157 | do { \ |
| 158 | if (hpet_verbose) \ |
| 159 | _hpet_print_config(__FUNCTION__, __LINE__); \ |
| 160 | } while (0) |
| 161 | |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 162 | /* |
| 163 | * When the hpet driver (/dev/hpet) is enabled, we need to reserve |
| 164 | * timer 0 and timer 1 in case of RTC emulation. |
| 165 | */ |
| 166 | #ifdef CONFIG_HPET |
Venki Pallipadi | f0ed4e6 | 2008-09-08 10:18:40 -0700 | [diff] [blame] | 167 | |
Venki Pallipadi | 5f79f2f | 2008-09-24 10:03:17 -0700 | [diff] [blame] | 168 | static void hpet_reserve_msi_timers(struct hpet_data *hd); |
Venki Pallipadi | f0ed4e6 | 2008-09-08 10:18:40 -0700 | [diff] [blame] | 169 | |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 170 | static void hpet_reserve_platform_timers(unsigned long id) |
| 171 | { |
| 172 | struct hpet __iomem *hpet = hpet_virt_address; |
Balaji Rao | 37a47db8 | 2008-01-30 13:30:03 +0100 | [diff] [blame] | 173 | struct hpet_timer __iomem *timer = &hpet->hpet_timers[2]; |
| 174 | unsigned int nrtimers, i; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 175 | struct hpet_data hd; |
| 176 | |
| 177 | nrtimers = ((id & HPET_ID_NUMBER) >> HPET_ID_NUMBER_SHIFT) + 1; |
| 178 | |
Ingo Molnar | 4588c1f | 2008-09-06 14:19:17 +0200 | [diff] [blame] | 179 | memset(&hd, 0, sizeof(hd)); |
| 180 | hd.hd_phys_address = hpet_address; |
| 181 | hd.hd_address = hpet; |
| 182 | hd.hd_nirqs = nrtimers; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 183 | hpet_reserve_timer(&hd, 0); |
| 184 | |
| 185 | #ifdef CONFIG_HPET_EMULATE_RTC |
| 186 | hpet_reserve_timer(&hd, 1); |
| 187 | #endif |
Thomas Gleixner | 5761d64 | 2008-04-04 16:26:10 +0200 | [diff] [blame] | 188 | |
David Brownell | 64a76f6 | 2008-07-29 12:47:38 -0700 | [diff] [blame] | 189 | /* |
| 190 | * NOTE that hd_irq[] reflects IOAPIC input pins (LEGACY_8254 |
| 191 | * is wrong for i8259!) not the output IRQ. Many BIOS writers |
| 192 | * don't bother configuring *any* comparator interrupts. |
| 193 | */ |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 194 | hd.hd_irq[0] = HPET_LEGACY_8254; |
| 195 | hd.hd_irq[1] = HPET_LEGACY_RTC; |
| 196 | |
Ingo Molnar | fc3fbc4 | 2008-04-27 14:04:14 +0200 | [diff] [blame] | 197 | for (i = 2; i < nrtimers; timer++, i++) { |
Ingo Molnar | 4588c1f | 2008-09-06 14:19:17 +0200 | [diff] [blame] | 198 | hd.hd_irq[i] = (readl(&timer->hpet_config) & |
| 199 | Tn_INT_ROUTE_CNF_MASK) >> Tn_INT_ROUTE_CNF_SHIFT; |
Ingo Molnar | fc3fbc4 | 2008-04-27 14:04:14 +0200 | [diff] [blame] | 200 | } |
Thomas Gleixner | 5761d64 | 2008-04-04 16:26:10 +0200 | [diff] [blame] | 201 | |
Venki Pallipadi | f0ed4e6 | 2008-09-08 10:18:40 -0700 | [diff] [blame] | 202 | hpet_reserve_msi_timers(&hd); |
venkatesh.pallipadi@intel.com | 26afe5f | 2008-09-05 18:02:18 -0700 | [diff] [blame] | 203 | |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 204 | hpet_alloc(&hd); |
Thomas Gleixner | 5761d64 | 2008-04-04 16:26:10 +0200 | [diff] [blame] | 205 | |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 206 | } |
| 207 | #else |
| 208 | static void hpet_reserve_platform_timers(unsigned long id) { } |
| 209 | #endif |
| 210 | |
| 211 | /* |
| 212 | * Common hpet info |
| 213 | */ |
| 214 | static unsigned long hpet_period; |
| 215 | |
Venki Pallipadi | 610bf2f | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 216 | static void hpet_legacy_set_mode(enum clock_event_mode mode, |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 217 | struct clock_event_device *evt); |
Venki Pallipadi | 610bf2f | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 218 | static int hpet_legacy_next_event(unsigned long delta, |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 219 | struct clock_event_device *evt); |
| 220 | |
| 221 | /* |
| 222 | * The hpet clock event device |
| 223 | */ |
| 224 | static struct clock_event_device hpet_clockevent = { |
| 225 | .name = "hpet", |
| 226 | .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, |
Venki Pallipadi | 610bf2f | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 227 | .set_mode = hpet_legacy_set_mode, |
| 228 | .set_next_event = hpet_legacy_next_event, |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 229 | .shift = 32, |
| 230 | .irq = 0, |
Venki Pallipadi | 59c69f2 | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 231 | .rating = 50, |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 232 | }; |
| 233 | |
Andreas Herrmann | 8d6f0c8 | 2009-02-21 00:10:44 +0100 | [diff] [blame] | 234 | static void hpet_stop_counter(void) |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 235 | { |
| 236 | unsigned long cfg = hpet_readl(HPET_CFG); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 237 | cfg &= ~HPET_CFG_ENABLE; |
| 238 | hpet_writel(cfg, HPET_CFG); |
| 239 | hpet_writel(0, HPET_COUNTER); |
| 240 | hpet_writel(0, HPET_COUNTER + 4); |
Andreas Herrmann | 8d6f0c8 | 2009-02-21 00:10:44 +0100 | [diff] [blame] | 241 | } |
| 242 | |
| 243 | static void hpet_start_counter(void) |
| 244 | { |
| 245 | unsigned long cfg = hpet_readl(HPET_CFG); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 246 | cfg |= HPET_CFG_ENABLE; |
| 247 | hpet_writel(cfg, HPET_CFG); |
| 248 | } |
| 249 | |
Andreas Herrmann | 8d6f0c8 | 2009-02-21 00:10:44 +0100 | [diff] [blame] | 250 | static void hpet_restart_counter(void) |
| 251 | { |
| 252 | hpet_stop_counter(); |
| 253 | hpet_start_counter(); |
| 254 | } |
| 255 | |
Venki Pallipadi | 59c69f2 | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 256 | static void hpet_resume_device(void) |
| 257 | { |
Venki Pallipadi | bfe0c1c | 2007-10-12 23:04:24 +0200 | [diff] [blame] | 258 | force_hpet_resume(); |
Venki Pallipadi | 59c69f2 | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 259 | } |
| 260 | |
Andreas Herrmann | 8d6f0c8 | 2009-02-21 00:10:44 +0100 | [diff] [blame] | 261 | static void hpet_resume_counter(void) |
Venki Pallipadi | 59c69f2 | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 262 | { |
| 263 | hpet_resume_device(); |
Andreas Herrmann | 8d6f0c8 | 2009-02-21 00:10:44 +0100 | [diff] [blame] | 264 | hpet_restart_counter(); |
Venki Pallipadi | 59c69f2 | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 265 | } |
| 266 | |
Venki Pallipadi | 610bf2f | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 267 | static void hpet_enable_legacy_int(void) |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 268 | { |
| 269 | unsigned long cfg = hpet_readl(HPET_CFG); |
| 270 | |
| 271 | cfg |= HPET_CFG_LEGACY; |
| 272 | hpet_writel(cfg, HPET_CFG); |
| 273 | hpet_legacy_int_enabled = 1; |
| 274 | } |
| 275 | |
Venki Pallipadi | 610bf2f | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 276 | static void hpet_legacy_clockevent_register(void) |
| 277 | { |
Venki Pallipadi | 610bf2f | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 278 | /* Start HPET legacy interrupts */ |
| 279 | hpet_enable_legacy_int(); |
| 280 | |
| 281 | /* |
Carlos R. Mafra | 6fd592d | 2008-05-05 20:11:22 -0300 | [diff] [blame] | 282 | * The mult factor is defined as (include/linux/clockchips.h) |
| 283 | * mult/2^shift = cyc/ns (in contrast to ns/cyc in clocksource.h) |
| 284 | * hpet_period is in units of femtoseconds (per cycle), so |
| 285 | * mult/2^shift = cyc/ns = 10^6/hpet_period |
| 286 | * mult = (10^6 * 2^shift)/hpet_period |
| 287 | * mult = (FSEC_PER_NSEC << hpet_clockevent.shift)/hpet_period |
Venki Pallipadi | 610bf2f | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 288 | */ |
Carlos R. Mafra | 6fd592d | 2008-05-05 20:11:22 -0300 | [diff] [blame] | 289 | hpet_clockevent.mult = div_sc((unsigned long) FSEC_PER_NSEC, |
| 290 | hpet_period, hpet_clockevent.shift); |
Venki Pallipadi | 610bf2f | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 291 | /* Calculate the min / max delta */ |
| 292 | hpet_clockevent.max_delta_ns = clockevent_delta2ns(0x7FFFFFFF, |
| 293 | &hpet_clockevent); |
Thomas Gleixner | 7cfb0435 | 2008-09-03 21:37:24 +0000 | [diff] [blame] | 294 | /* 5 usec minimum reprogramming delta. */ |
| 295 | hpet_clockevent.min_delta_ns = 5000; |
Venki Pallipadi | 610bf2f | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 296 | |
| 297 | /* |
| 298 | * Start hpet with the boot cpu mask and make it |
| 299 | * global after the IO_APIC has been initialized. |
| 300 | */ |
Rusty Russell | 320ab2b | 2008-12-13 21:20:26 +1030 | [diff] [blame] | 301 | hpet_clockevent.cpumask = cpumask_of(smp_processor_id()); |
Venki Pallipadi | 610bf2f | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 302 | clockevents_register_device(&hpet_clockevent); |
| 303 | global_clock_event = &hpet_clockevent; |
| 304 | printk(KERN_DEBUG "hpet clockevent registered\n"); |
| 305 | } |
| 306 | |
venkatesh.pallipadi@intel.com | 26afe5f | 2008-09-05 18:02:18 -0700 | [diff] [blame] | 307 | static int hpet_setup_msi_irq(unsigned int irq); |
| 308 | |
venkatesh.pallipadi@intel.com | b40d575 | 2008-09-05 18:02:16 -0700 | [diff] [blame] | 309 | static void hpet_set_mode(enum clock_event_mode mode, |
| 310 | struct clock_event_device *evt, int timer) |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 311 | { |
Andreas Herrmann | c23e253 | 2009-02-21 00:16:35 +0100 | [diff] [blame] | 312 | unsigned long cfg; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 313 | uint64_t delta; |
| 314 | |
Ingo Molnar | 4588c1f | 2008-09-06 14:19:17 +0200 | [diff] [blame] | 315 | switch (mode) { |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 316 | case CLOCK_EVT_MODE_PERIODIC: |
Andreas Herrmann | c23e253 | 2009-02-21 00:16:35 +0100 | [diff] [blame] | 317 | hpet_stop_counter(); |
venkatesh.pallipadi@intel.com | b40d575 | 2008-09-05 18:02:16 -0700 | [diff] [blame] | 318 | delta = ((uint64_t)(NSEC_PER_SEC/HZ)) * evt->mult; |
| 319 | delta >>= evt->shift; |
venkatesh.pallipadi@intel.com | b40d575 | 2008-09-05 18:02:16 -0700 | [diff] [blame] | 320 | cfg = hpet_readl(HPET_Tn_CFG(timer)); |
john stultz | b13e246 | 2009-02-12 18:48:53 -0800 | [diff] [blame] | 321 | /* Make sure we use edge triggered interrupts */ |
| 322 | cfg &= ~HPET_TN_LEVEL; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 323 | cfg |= HPET_TN_ENABLE | HPET_TN_PERIODIC | |
| 324 | HPET_TN_SETVAL | HPET_TN_32BIT; |
venkatesh.pallipadi@intel.com | b40d575 | 2008-09-05 18:02:16 -0700 | [diff] [blame] | 325 | hpet_writel(cfg, HPET_Tn_CFG(timer)); |
venkatesh.pallipadi@intel.com | b40d575 | 2008-09-05 18:02:16 -0700 | [diff] [blame] | 326 | hpet_writel((unsigned long) delta, HPET_Tn_CMP(timer)); |
Andreas Herrmann | c23e253 | 2009-02-21 00:16:35 +0100 | [diff] [blame] | 327 | hpet_start_counter(); |
Andreas Herrmann | b98103a | 2009-02-21 00:09:47 +0100 | [diff] [blame] | 328 | hpet_print_config(); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 329 | break; |
| 330 | |
| 331 | case CLOCK_EVT_MODE_ONESHOT: |
venkatesh.pallipadi@intel.com | b40d575 | 2008-09-05 18:02:16 -0700 | [diff] [blame] | 332 | cfg = hpet_readl(HPET_Tn_CFG(timer)); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 333 | cfg &= ~HPET_TN_PERIODIC; |
| 334 | cfg |= HPET_TN_ENABLE | HPET_TN_32BIT; |
venkatesh.pallipadi@intel.com | b40d575 | 2008-09-05 18:02:16 -0700 | [diff] [blame] | 335 | hpet_writel(cfg, HPET_Tn_CFG(timer)); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 336 | break; |
| 337 | |
| 338 | case CLOCK_EVT_MODE_UNUSED: |
| 339 | case CLOCK_EVT_MODE_SHUTDOWN: |
venkatesh.pallipadi@intel.com | b40d575 | 2008-09-05 18:02:16 -0700 | [diff] [blame] | 340 | cfg = hpet_readl(HPET_Tn_CFG(timer)); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 341 | cfg &= ~HPET_TN_ENABLE; |
venkatesh.pallipadi@intel.com | b40d575 | 2008-09-05 18:02:16 -0700 | [diff] [blame] | 342 | hpet_writel(cfg, HPET_Tn_CFG(timer)); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 343 | break; |
Thomas Gleixner | 18de5bc | 2007-07-21 04:37:34 -0700 | [diff] [blame] | 344 | |
| 345 | case CLOCK_EVT_MODE_RESUME: |
venkatesh.pallipadi@intel.com | 26afe5f | 2008-09-05 18:02:18 -0700 | [diff] [blame] | 346 | if (timer == 0) { |
| 347 | hpet_enable_legacy_int(); |
| 348 | } else { |
| 349 | struct hpet_dev *hdev = EVT_TO_HPET_DEV(evt); |
| 350 | hpet_setup_msi_irq(hdev->irq); |
| 351 | disable_irq(hdev->irq); |
Rusty Russell | 0de2652 | 2008-12-13 21:20:26 +1030 | [diff] [blame] | 352 | irq_set_affinity(hdev->irq, cpumask_of(hdev->cpu)); |
venkatesh.pallipadi@intel.com | 26afe5f | 2008-09-05 18:02:18 -0700 | [diff] [blame] | 353 | enable_irq(hdev->irq); |
| 354 | } |
Andreas Herrmann | b98103a | 2009-02-21 00:09:47 +0100 | [diff] [blame] | 355 | hpet_print_config(); |
Thomas Gleixner | 18de5bc | 2007-07-21 04:37:34 -0700 | [diff] [blame] | 356 | break; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 357 | } |
| 358 | } |
| 359 | |
venkatesh.pallipadi@intel.com | b40d575 | 2008-09-05 18:02:16 -0700 | [diff] [blame] | 360 | static int hpet_next_event(unsigned long delta, |
| 361 | struct clock_event_device *evt, int timer) |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 362 | { |
Thomas Gleixner | f767625 | 2008-09-06 03:03:32 +0200 | [diff] [blame] | 363 | u32 cnt; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 364 | |
| 365 | cnt = hpet_readl(HPET_COUNTER); |
Thomas Gleixner | f767625 | 2008-09-06 03:03:32 +0200 | [diff] [blame] | 366 | cnt += (u32) delta; |
venkatesh.pallipadi@intel.com | b40d575 | 2008-09-05 18:02:16 -0700 | [diff] [blame] | 367 | hpet_writel(cnt, HPET_Tn_CMP(timer)); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 368 | |
Thomas Gleixner | 72d43d9 | 2008-09-06 03:06:08 +0200 | [diff] [blame] | 369 | /* |
| 370 | * We need to read back the CMP register to make sure that |
| 371 | * what we wrote hit the chip before we compare it to the |
| 372 | * counter. |
| 373 | */ |
Matt Fleming | 89d77a1 | 2008-11-02 16:04:20 +0000 | [diff] [blame] | 374 | WARN_ON_ONCE((u32)hpet_readl(HPET_Tn_CMP(timer)) != cnt); |
Thomas Gleixner | 72d43d9 | 2008-09-06 03:06:08 +0200 | [diff] [blame] | 375 | |
Thomas Gleixner | f767625 | 2008-09-06 03:03:32 +0200 | [diff] [blame] | 376 | return (s32)((u32)hpet_readl(HPET_COUNTER) - cnt) >= 0 ? -ETIME : 0; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 377 | } |
| 378 | |
venkatesh.pallipadi@intel.com | b40d575 | 2008-09-05 18:02:16 -0700 | [diff] [blame] | 379 | static void hpet_legacy_set_mode(enum clock_event_mode mode, |
| 380 | struct clock_event_device *evt) |
| 381 | { |
| 382 | hpet_set_mode(mode, evt, 0); |
| 383 | } |
| 384 | |
| 385 | static int hpet_legacy_next_event(unsigned long delta, |
| 386 | struct clock_event_device *evt) |
| 387 | { |
| 388 | return hpet_next_event(delta, evt, 0); |
| 389 | } |
| 390 | |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 391 | /* |
venkatesh.pallipadi@intel.com | 58ac1e7 | 2008-09-05 18:02:17 -0700 | [diff] [blame] | 392 | * HPET MSI Support |
| 393 | */ |
venkatesh.pallipadi@intel.com | 26afe5f | 2008-09-05 18:02:18 -0700 | [diff] [blame] | 394 | #ifdef CONFIG_PCI_MSI |
Venki Pallipadi | 5f79f2f | 2008-09-24 10:03:17 -0700 | [diff] [blame] | 395 | |
| 396 | static DEFINE_PER_CPU(struct hpet_dev *, cpu_hpet_dev); |
| 397 | static struct hpet_dev *hpet_devs; |
| 398 | |
venkatesh.pallipadi@intel.com | 58ac1e7 | 2008-09-05 18:02:17 -0700 | [diff] [blame] | 399 | void hpet_msi_unmask(unsigned int irq) |
| 400 | { |
| 401 | struct hpet_dev *hdev = get_irq_data(irq); |
| 402 | unsigned long cfg; |
| 403 | |
| 404 | /* unmask it */ |
| 405 | cfg = hpet_readl(HPET_Tn_CFG(hdev->num)); |
| 406 | cfg |= HPET_TN_FSB; |
| 407 | hpet_writel(cfg, HPET_Tn_CFG(hdev->num)); |
| 408 | } |
| 409 | |
| 410 | void hpet_msi_mask(unsigned int irq) |
| 411 | { |
| 412 | unsigned long cfg; |
| 413 | struct hpet_dev *hdev = get_irq_data(irq); |
| 414 | |
| 415 | /* mask it */ |
| 416 | cfg = hpet_readl(HPET_Tn_CFG(hdev->num)); |
| 417 | cfg &= ~HPET_TN_FSB; |
| 418 | hpet_writel(cfg, HPET_Tn_CFG(hdev->num)); |
| 419 | } |
| 420 | |
| 421 | void hpet_msi_write(unsigned int irq, struct msi_msg *msg) |
| 422 | { |
| 423 | struct hpet_dev *hdev = get_irq_data(irq); |
| 424 | |
| 425 | hpet_writel(msg->data, HPET_Tn_ROUTE(hdev->num)); |
| 426 | hpet_writel(msg->address_lo, HPET_Tn_ROUTE(hdev->num) + 4); |
| 427 | } |
| 428 | |
| 429 | void hpet_msi_read(unsigned int irq, struct msi_msg *msg) |
| 430 | { |
| 431 | struct hpet_dev *hdev = get_irq_data(irq); |
| 432 | |
| 433 | msg->data = hpet_readl(HPET_Tn_ROUTE(hdev->num)); |
| 434 | msg->address_lo = hpet_readl(HPET_Tn_ROUTE(hdev->num) + 4); |
| 435 | msg->address_hi = 0; |
| 436 | } |
| 437 | |
venkatesh.pallipadi@intel.com | 26afe5f | 2008-09-05 18:02:18 -0700 | [diff] [blame] | 438 | static void hpet_msi_set_mode(enum clock_event_mode mode, |
| 439 | struct clock_event_device *evt) |
| 440 | { |
| 441 | struct hpet_dev *hdev = EVT_TO_HPET_DEV(evt); |
| 442 | hpet_set_mode(mode, evt, hdev->num); |
| 443 | } |
| 444 | |
| 445 | static int hpet_msi_next_event(unsigned long delta, |
| 446 | struct clock_event_device *evt) |
| 447 | { |
| 448 | struct hpet_dev *hdev = EVT_TO_HPET_DEV(evt); |
| 449 | return hpet_next_event(delta, evt, hdev->num); |
| 450 | } |
| 451 | |
| 452 | static int hpet_setup_msi_irq(unsigned int irq) |
| 453 | { |
| 454 | if (arch_setup_hpet_msi(irq)) { |
| 455 | destroy_irq(irq); |
| 456 | return -EINVAL; |
| 457 | } |
| 458 | return 0; |
| 459 | } |
| 460 | |
| 461 | static int hpet_assign_irq(struct hpet_dev *dev) |
| 462 | { |
| 463 | unsigned int irq; |
| 464 | |
| 465 | irq = create_irq(); |
| 466 | if (!irq) |
| 467 | return -EINVAL; |
| 468 | |
| 469 | set_irq_data(irq, dev); |
| 470 | |
| 471 | if (hpet_setup_msi_irq(irq)) |
| 472 | return -EINVAL; |
| 473 | |
| 474 | dev->irq = irq; |
| 475 | return 0; |
| 476 | } |
| 477 | |
| 478 | static irqreturn_t hpet_interrupt_handler(int irq, void *data) |
| 479 | { |
| 480 | struct hpet_dev *dev = (struct hpet_dev *)data; |
| 481 | struct clock_event_device *hevt = &dev->evt; |
| 482 | |
| 483 | if (!hevt->event_handler) { |
| 484 | printk(KERN_INFO "Spurious HPET timer interrupt on HPET timer %d\n", |
| 485 | dev->num); |
| 486 | return IRQ_HANDLED; |
| 487 | } |
| 488 | |
| 489 | hevt->event_handler(hevt); |
| 490 | return IRQ_HANDLED; |
| 491 | } |
| 492 | |
| 493 | static int hpet_setup_irq(struct hpet_dev *dev) |
| 494 | { |
| 495 | |
| 496 | if (request_irq(dev->irq, hpet_interrupt_handler, |
Matt Fleming | 5ceb1a0 | 2008-11-02 22:23:13 +0000 | [diff] [blame] | 497 | IRQF_DISABLED|IRQF_NOBALANCING, dev->name, dev)) |
venkatesh.pallipadi@intel.com | 26afe5f | 2008-09-05 18:02:18 -0700 | [diff] [blame] | 498 | return -1; |
| 499 | |
| 500 | disable_irq(dev->irq); |
Rusty Russell | 0de2652 | 2008-12-13 21:20:26 +1030 | [diff] [blame] | 501 | irq_set_affinity(dev->irq, cpumask_of(dev->cpu)); |
venkatesh.pallipadi@intel.com | 26afe5f | 2008-09-05 18:02:18 -0700 | [diff] [blame] | 502 | enable_irq(dev->irq); |
| 503 | |
Yinghai Lu | c81bba4 | 2008-09-25 11:53:11 -0700 | [diff] [blame] | 504 | printk(KERN_DEBUG "hpet: %s irq %d for MSI\n", |
| 505 | dev->name, dev->irq); |
| 506 | |
venkatesh.pallipadi@intel.com | 26afe5f | 2008-09-05 18:02:18 -0700 | [diff] [blame] | 507 | return 0; |
| 508 | } |
| 509 | |
| 510 | /* This should be called in specific @cpu */ |
| 511 | static void init_one_hpet_msi_clockevent(struct hpet_dev *hdev, int cpu) |
| 512 | { |
| 513 | struct clock_event_device *evt = &hdev->evt; |
| 514 | uint64_t hpet_freq; |
| 515 | |
| 516 | WARN_ON(cpu != smp_processor_id()); |
| 517 | if (!(hdev->flags & HPET_DEV_VALID)) |
| 518 | return; |
| 519 | |
| 520 | if (hpet_setup_msi_irq(hdev->irq)) |
| 521 | return; |
| 522 | |
| 523 | hdev->cpu = cpu; |
| 524 | per_cpu(cpu_hpet_dev, cpu) = hdev; |
| 525 | evt->name = hdev->name; |
| 526 | hpet_setup_irq(hdev); |
| 527 | evt->irq = hdev->irq; |
| 528 | |
| 529 | evt->rating = 110; |
| 530 | evt->features = CLOCK_EVT_FEAT_ONESHOT; |
| 531 | if (hdev->flags & HPET_DEV_PERI_CAP) |
| 532 | evt->features |= CLOCK_EVT_FEAT_PERIODIC; |
| 533 | |
| 534 | evt->set_mode = hpet_msi_set_mode; |
| 535 | evt->set_next_event = hpet_msi_next_event; |
| 536 | evt->shift = 32; |
| 537 | |
| 538 | /* |
| 539 | * The period is a femto seconds value. We need to calculate the |
| 540 | * scaled math multiplication factor for nanosecond to hpet tick |
| 541 | * conversion. |
| 542 | */ |
| 543 | hpet_freq = 1000000000000000ULL; |
| 544 | do_div(hpet_freq, hpet_period); |
| 545 | evt->mult = div_sc((unsigned long) hpet_freq, |
| 546 | NSEC_PER_SEC, evt->shift); |
| 547 | /* Calculate the max delta */ |
| 548 | evt->max_delta_ns = clockevent_delta2ns(0x7FFFFFFF, evt); |
| 549 | /* 5 usec minimum reprogramming delta. */ |
| 550 | evt->min_delta_ns = 5000; |
| 551 | |
Rusty Russell | 320ab2b | 2008-12-13 21:20:26 +1030 | [diff] [blame] | 552 | evt->cpumask = cpumask_of(hdev->cpu); |
venkatesh.pallipadi@intel.com | 26afe5f | 2008-09-05 18:02:18 -0700 | [diff] [blame] | 553 | clockevents_register_device(evt); |
| 554 | } |
| 555 | |
| 556 | #ifdef CONFIG_HPET |
| 557 | /* Reserve at least one timer for userspace (/dev/hpet) */ |
| 558 | #define RESERVE_TIMERS 1 |
| 559 | #else |
| 560 | #define RESERVE_TIMERS 0 |
| 561 | #endif |
Venki Pallipadi | 5f79f2f | 2008-09-24 10:03:17 -0700 | [diff] [blame] | 562 | |
| 563 | static void hpet_msi_capability_lookup(unsigned int start_timer) |
venkatesh.pallipadi@intel.com | 26afe5f | 2008-09-05 18:02:18 -0700 | [diff] [blame] | 564 | { |
| 565 | unsigned int id; |
| 566 | unsigned int num_timers; |
| 567 | unsigned int num_timers_used = 0; |
| 568 | int i; |
| 569 | |
| 570 | id = hpet_readl(HPET_ID); |
| 571 | |
| 572 | num_timers = ((id & HPET_ID_NUMBER) >> HPET_ID_NUMBER_SHIFT); |
| 573 | num_timers++; /* Value read out starts from 0 */ |
Andreas Herrmann | b98103a | 2009-02-21 00:09:47 +0100 | [diff] [blame] | 574 | hpet_print_config(); |
venkatesh.pallipadi@intel.com | 26afe5f | 2008-09-05 18:02:18 -0700 | [diff] [blame] | 575 | |
| 576 | hpet_devs = kzalloc(sizeof(struct hpet_dev) * num_timers, GFP_KERNEL); |
| 577 | if (!hpet_devs) |
| 578 | return; |
| 579 | |
| 580 | hpet_num_timers = num_timers; |
| 581 | |
| 582 | for (i = start_timer; i < num_timers - RESERVE_TIMERS; i++) { |
| 583 | struct hpet_dev *hdev = &hpet_devs[num_timers_used]; |
| 584 | unsigned long cfg = hpet_readl(HPET_Tn_CFG(i)); |
| 585 | |
| 586 | /* Only consider HPET timer with MSI support */ |
| 587 | if (!(cfg & HPET_TN_FSB_CAP)) |
| 588 | continue; |
| 589 | |
| 590 | hdev->flags = 0; |
| 591 | if (cfg & HPET_TN_PERIODIC_CAP) |
| 592 | hdev->flags |= HPET_DEV_PERI_CAP; |
| 593 | hdev->num = i; |
| 594 | |
| 595 | sprintf(hdev->name, "hpet%d", i); |
| 596 | if (hpet_assign_irq(hdev)) |
| 597 | continue; |
| 598 | |
| 599 | hdev->flags |= HPET_DEV_FSB_CAP; |
| 600 | hdev->flags |= HPET_DEV_VALID; |
| 601 | num_timers_used++; |
| 602 | if (num_timers_used == num_possible_cpus()) |
| 603 | break; |
| 604 | } |
| 605 | |
| 606 | printk(KERN_INFO "HPET: %d timers in total, %d timers will be used for per-cpu timer\n", |
| 607 | num_timers, num_timers_used); |
| 608 | } |
| 609 | |
Venki Pallipadi | 5f79f2f | 2008-09-24 10:03:17 -0700 | [diff] [blame] | 610 | #ifdef CONFIG_HPET |
| 611 | static void hpet_reserve_msi_timers(struct hpet_data *hd) |
| 612 | { |
| 613 | int i; |
| 614 | |
| 615 | if (!hpet_devs) |
| 616 | return; |
| 617 | |
| 618 | for (i = 0; i < hpet_num_timers; i++) { |
| 619 | struct hpet_dev *hdev = &hpet_devs[i]; |
| 620 | |
| 621 | if (!(hdev->flags & HPET_DEV_VALID)) |
| 622 | continue; |
| 623 | |
| 624 | hd->hd_irq[hdev->num] = hdev->irq; |
| 625 | hpet_reserve_timer(hd, hdev->num); |
| 626 | } |
| 627 | } |
| 628 | #endif |
| 629 | |
venkatesh.pallipadi@intel.com | 26afe5f | 2008-09-05 18:02:18 -0700 | [diff] [blame] | 630 | static struct hpet_dev *hpet_get_unused_timer(void) |
| 631 | { |
| 632 | int i; |
| 633 | |
| 634 | if (!hpet_devs) |
| 635 | return NULL; |
| 636 | |
| 637 | for (i = 0; i < hpet_num_timers; i++) { |
| 638 | struct hpet_dev *hdev = &hpet_devs[i]; |
| 639 | |
| 640 | if (!(hdev->flags & HPET_DEV_VALID)) |
| 641 | continue; |
| 642 | if (test_and_set_bit(HPET_DEV_USED_BIT, |
| 643 | (unsigned long *)&hdev->flags)) |
| 644 | continue; |
| 645 | return hdev; |
| 646 | } |
| 647 | return NULL; |
| 648 | } |
| 649 | |
| 650 | struct hpet_work_struct { |
| 651 | struct delayed_work work; |
| 652 | struct completion complete; |
| 653 | }; |
| 654 | |
| 655 | static void hpet_work(struct work_struct *w) |
| 656 | { |
| 657 | struct hpet_dev *hdev; |
| 658 | int cpu = smp_processor_id(); |
| 659 | struct hpet_work_struct *hpet_work; |
| 660 | |
| 661 | hpet_work = container_of(w, struct hpet_work_struct, work.work); |
| 662 | |
| 663 | hdev = hpet_get_unused_timer(); |
| 664 | if (hdev) |
| 665 | init_one_hpet_msi_clockevent(hdev, cpu); |
| 666 | |
| 667 | complete(&hpet_work->complete); |
| 668 | } |
| 669 | |
| 670 | static int hpet_cpuhp_notify(struct notifier_block *n, |
| 671 | unsigned long action, void *hcpu) |
| 672 | { |
| 673 | unsigned long cpu = (unsigned long)hcpu; |
| 674 | struct hpet_work_struct work; |
| 675 | struct hpet_dev *hdev = per_cpu(cpu_hpet_dev, cpu); |
| 676 | |
| 677 | switch (action & 0xf) { |
| 678 | case CPU_ONLINE: |
Thomas Gleixner | 336f6c3 | 2009-01-22 09:50:44 +0100 | [diff] [blame] | 679 | INIT_DELAYED_WORK_ON_STACK(&work.work, hpet_work); |
venkatesh.pallipadi@intel.com | 26afe5f | 2008-09-05 18:02:18 -0700 | [diff] [blame] | 680 | init_completion(&work.complete); |
| 681 | /* FIXME: add schedule_work_on() */ |
| 682 | schedule_delayed_work_on(cpu, &work.work, 0); |
| 683 | wait_for_completion(&work.complete); |
Thomas Gleixner | 336f6c3 | 2009-01-22 09:50:44 +0100 | [diff] [blame] | 684 | destroy_timer_on_stack(&work.work.timer); |
venkatesh.pallipadi@intel.com | 26afe5f | 2008-09-05 18:02:18 -0700 | [diff] [blame] | 685 | break; |
| 686 | case CPU_DEAD: |
| 687 | if (hdev) { |
| 688 | free_irq(hdev->irq, hdev); |
| 689 | hdev->flags &= ~HPET_DEV_USED; |
| 690 | per_cpu(cpu_hpet_dev, cpu) = NULL; |
| 691 | } |
| 692 | break; |
| 693 | } |
| 694 | return NOTIFY_OK; |
| 695 | } |
| 696 | #else |
| 697 | |
Steven Noonan | ba374c9 | 2008-09-08 16:19:09 -0700 | [diff] [blame] | 698 | static int hpet_setup_msi_irq(unsigned int irq) |
| 699 | { |
| 700 | return 0; |
| 701 | } |
Venki Pallipadi | 5f79f2f | 2008-09-24 10:03:17 -0700 | [diff] [blame] | 702 | static void hpet_msi_capability_lookup(unsigned int start_timer) |
venkatesh.pallipadi@intel.com | 26afe5f | 2008-09-05 18:02:18 -0700 | [diff] [blame] | 703 | { |
| 704 | return; |
| 705 | } |
| 706 | |
Venki Pallipadi | 5f79f2f | 2008-09-24 10:03:17 -0700 | [diff] [blame] | 707 | #ifdef CONFIG_HPET |
| 708 | static void hpet_reserve_msi_timers(struct hpet_data *hd) |
| 709 | { |
| 710 | return; |
| 711 | } |
| 712 | #endif |
| 713 | |
venkatesh.pallipadi@intel.com | 26afe5f | 2008-09-05 18:02:18 -0700 | [diff] [blame] | 714 | static int hpet_cpuhp_notify(struct notifier_block *n, |
| 715 | unsigned long action, void *hcpu) |
| 716 | { |
| 717 | return NOTIFY_OK; |
| 718 | } |
| 719 | |
| 720 | #endif |
| 721 | |
venkatesh.pallipadi@intel.com | 58ac1e7 | 2008-09-05 18:02:17 -0700 | [diff] [blame] | 722 | /* |
john stultz | 6bb74df | 2007-03-05 00:30:50 -0800 | [diff] [blame] | 723 | * Clock source related code |
| 724 | */ |
Magnus Damm | 8e19608 | 2009-04-21 12:24:00 -0700 | [diff] [blame^] | 725 | static cycle_t read_hpet(struct clocksource *cs) |
john stultz | 6bb74df | 2007-03-05 00:30:50 -0800 | [diff] [blame] | 726 | { |
| 727 | return (cycle_t)hpet_readl(HPET_COUNTER); |
| 728 | } |
| 729 | |
Thomas Gleixner | 2876914 | 2007-10-12 23:04:06 +0200 | [diff] [blame] | 730 | #ifdef CONFIG_X86_64 |
| 731 | static cycle_t __vsyscall_fn vread_hpet(void) |
| 732 | { |
| 733 | return readl((const void __iomem *)fix_to_virt(VSYSCALL_HPET) + 0xf0); |
| 734 | } |
| 735 | #endif |
| 736 | |
john stultz | 6bb74df | 2007-03-05 00:30:50 -0800 | [diff] [blame] | 737 | static struct clocksource clocksource_hpet = { |
| 738 | .name = "hpet", |
| 739 | .rating = 250, |
| 740 | .read = read_hpet, |
| 741 | .mask = HPET_MASK, |
| 742 | .shift = HPET_SHIFT, |
| 743 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
Andreas Herrmann | 8d6f0c8 | 2009-02-21 00:10:44 +0100 | [diff] [blame] | 744 | .resume = hpet_resume_counter, |
Thomas Gleixner | 2876914 | 2007-10-12 23:04:06 +0200 | [diff] [blame] | 745 | #ifdef CONFIG_X86_64 |
| 746 | .vread = vread_hpet, |
| 747 | #endif |
john stultz | 6bb74df | 2007-03-05 00:30:50 -0800 | [diff] [blame] | 748 | }; |
| 749 | |
Venki Pallipadi | 610bf2f | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 750 | static int hpet_clocksource_register(void) |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 751 | { |
Carlos R. Mafra | 6fd592d | 2008-05-05 20:11:22 -0300 | [diff] [blame] | 752 | u64 start, now; |
Thomas Gleixner | 075bcd1 | 2007-07-21 17:11:12 +0200 | [diff] [blame] | 753 | cycle_t t1; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 754 | |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 755 | /* Start the counter */ |
Andreas Herrmann | 8d6f0c8 | 2009-02-21 00:10:44 +0100 | [diff] [blame] | 756 | hpet_restart_counter(); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 757 | |
Thomas Gleixner | 075bcd1 | 2007-07-21 17:11:12 +0200 | [diff] [blame] | 758 | /* Verify whether hpet counter works */ |
Magnus Damm | 8e19608 | 2009-04-21 12:24:00 -0700 | [diff] [blame^] | 759 | t1 = hpet_readl(HPET_COUNTER); |
Thomas Gleixner | 075bcd1 | 2007-07-21 17:11:12 +0200 | [diff] [blame] | 760 | rdtscll(start); |
| 761 | |
| 762 | /* |
| 763 | * We don't know the TSC frequency yet, but waiting for |
| 764 | * 200000 TSC cycles is safe: |
| 765 | * 4 GHz == 50us |
| 766 | * 1 GHz == 200us |
| 767 | */ |
| 768 | do { |
| 769 | rep_nop(); |
| 770 | rdtscll(now); |
| 771 | } while ((now - start) < 200000UL); |
| 772 | |
Magnus Damm | 8e19608 | 2009-04-21 12:24:00 -0700 | [diff] [blame^] | 773 | if (t1 == hpet_readl(HPET_COUNTER)) { |
Thomas Gleixner | 075bcd1 | 2007-07-21 17:11:12 +0200 | [diff] [blame] | 774 | printk(KERN_WARNING |
| 775 | "HPET counter not counting. HPET disabled\n"); |
Venki Pallipadi | 610bf2f | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 776 | return -ENODEV; |
Thomas Gleixner | 075bcd1 | 2007-07-21 17:11:12 +0200 | [diff] [blame] | 777 | } |
| 778 | |
Carlos R. Mafra | 6fd592d | 2008-05-05 20:11:22 -0300 | [diff] [blame] | 779 | /* |
| 780 | * The definition of mult is (include/linux/clocksource.h) |
| 781 | * mult/2^shift = ns/cyc and hpet_period is in units of fsec/cyc |
| 782 | * so we first need to convert hpet_period to ns/cyc units: |
| 783 | * mult/2^shift = ns/cyc = hpet_period/10^6 |
| 784 | * mult = (hpet_period * 2^shift)/10^6 |
| 785 | * mult = (hpet_period << shift)/FSEC_PER_NSEC |
john stultz | 6bb74df | 2007-03-05 00:30:50 -0800 | [diff] [blame] | 786 | */ |
Carlos R. Mafra | 6fd592d | 2008-05-05 20:11:22 -0300 | [diff] [blame] | 787 | clocksource_hpet.mult = div_sc(hpet_period, FSEC_PER_NSEC, HPET_SHIFT); |
john stultz | 6bb74df | 2007-03-05 00:30:50 -0800 | [diff] [blame] | 788 | |
| 789 | clocksource_register(&clocksource_hpet); |
| 790 | |
Venki Pallipadi | 610bf2f | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 791 | return 0; |
| 792 | } |
| 793 | |
Pavel Machek | b02a7f2 | 2008-02-05 00:48:13 +0100 | [diff] [blame] | 794 | /** |
| 795 | * hpet_enable - Try to setup the HPET timer. Returns 1 on success. |
Venki Pallipadi | 610bf2f | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 796 | */ |
| 797 | int __init hpet_enable(void) |
| 798 | { |
| 799 | unsigned long id; |
Thomas Gleixner | a6825f1 | 2008-08-14 12:17:06 +0200 | [diff] [blame] | 800 | int i; |
Venki Pallipadi | 610bf2f | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 801 | |
| 802 | if (!is_hpet_capable()) |
| 803 | return 0; |
| 804 | |
| 805 | hpet_set_mapping(); |
| 806 | |
| 807 | /* |
| 808 | * Read the period and check for a sane value: |
| 809 | */ |
| 810 | hpet_period = hpet_readl(HPET_PERIOD); |
Thomas Gleixner | a6825f1 | 2008-08-14 12:17:06 +0200 | [diff] [blame] | 811 | |
| 812 | /* |
| 813 | * AMD SB700 based systems with spread spectrum enabled use a |
| 814 | * SMM based HPET emulation to provide proper frequency |
| 815 | * setting. The SMM code is initialized with the first HPET |
| 816 | * register access and takes some time to complete. During |
| 817 | * this time the config register reads 0xffffffff. We check |
| 818 | * for max. 1000 loops whether the config register reads a non |
| 819 | * 0xffffffff value to make sure that HPET is up and running |
| 820 | * before we go further. A counting loop is safe, as the HPET |
| 821 | * access takes thousands of CPU cycles. On non SB700 based |
| 822 | * machines this check is only done once and has no side |
| 823 | * effects. |
| 824 | */ |
| 825 | for (i = 0; hpet_readl(HPET_CFG) == 0xFFFFFFFF; i++) { |
| 826 | if (i == 1000) { |
| 827 | printk(KERN_WARNING |
| 828 | "HPET config register value = 0xFFFFFFFF. " |
| 829 | "Disabling HPET\n"); |
| 830 | goto out_nohpet; |
| 831 | } |
| 832 | } |
| 833 | |
Venki Pallipadi | 610bf2f | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 834 | if (hpet_period < HPET_MIN_PERIOD || hpet_period > HPET_MAX_PERIOD) |
| 835 | goto out_nohpet; |
| 836 | |
| 837 | /* |
| 838 | * Read the HPET ID register to retrieve the IRQ routing |
| 839 | * information and the number of channels |
| 840 | */ |
| 841 | id = hpet_readl(HPET_ID); |
Andreas Herrmann | b98103a | 2009-02-21 00:09:47 +0100 | [diff] [blame] | 842 | hpet_print_config(); |
Venki Pallipadi | 610bf2f | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 843 | |
| 844 | #ifdef CONFIG_HPET_EMULATE_RTC |
| 845 | /* |
| 846 | * The legacy routing mode needs at least two channels, tick timer |
| 847 | * and the rtc emulation channel. |
| 848 | */ |
| 849 | if (!(id & HPET_ID_NUMBER)) |
| 850 | goto out_nohpet; |
| 851 | #endif |
| 852 | |
| 853 | if (hpet_clocksource_register()) |
| 854 | goto out_nohpet; |
| 855 | |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 856 | if (id & HPET_ID_LEGSUP) { |
Venki Pallipadi | 610bf2f | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 857 | hpet_legacy_clockevent_register(); |
venkatesh.pallipadi@intel.com | 26afe5f | 2008-09-05 18:02:18 -0700 | [diff] [blame] | 858 | hpet_msi_capability_lookup(2); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 859 | return 1; |
| 860 | } |
venkatesh.pallipadi@intel.com | 26afe5f | 2008-09-05 18:02:18 -0700 | [diff] [blame] | 861 | hpet_msi_capability_lookup(0); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 862 | return 0; |
| 863 | |
| 864 | out_nohpet: |
Thomas Gleixner | 06a24de | 2007-10-12 23:04:06 +0200 | [diff] [blame] | 865 | hpet_clear_mapping(); |
Janne Kulmala | bacbe99 | 2008-12-16 13:39:57 +0200 | [diff] [blame] | 866 | hpet_address = 0; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 867 | return 0; |
| 868 | } |
| 869 | |
Thomas Gleixner | 2876914 | 2007-10-12 23:04:06 +0200 | [diff] [blame] | 870 | /* |
| 871 | * Needs to be late, as the reserve_timer code calls kalloc ! |
| 872 | * |
| 873 | * Not a problem on i386 as hpet_enable is called from late_time_init, |
| 874 | * but on x86_64 it is necessary ! |
| 875 | */ |
| 876 | static __init int hpet_late_init(void) |
| 877 | { |
venkatesh.pallipadi@intel.com | 26afe5f | 2008-09-05 18:02:18 -0700 | [diff] [blame] | 878 | int cpu; |
| 879 | |
Venki Pallipadi | 59c69f2 | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 880 | if (boot_hpet_disable) |
Thomas Gleixner | 2876914 | 2007-10-12 23:04:06 +0200 | [diff] [blame] | 881 | return -ENODEV; |
| 882 | |
Venki Pallipadi | 59c69f2 | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 883 | if (!hpet_address) { |
| 884 | if (!force_hpet_address) |
| 885 | return -ENODEV; |
| 886 | |
| 887 | hpet_address = force_hpet_address; |
| 888 | hpet_enable(); |
Venki Pallipadi | 59c69f2 | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 889 | } |
| 890 | |
Jeremy Fitzhardinge | 39c04b5 | 2008-12-16 12:32:23 -0800 | [diff] [blame] | 891 | if (!hpet_virt_address) |
| 892 | return -ENODEV; |
| 893 | |
Thomas Gleixner | 2876914 | 2007-10-12 23:04:06 +0200 | [diff] [blame] | 894 | hpet_reserve_platform_timers(hpet_readl(HPET_ID)); |
Andreas Herrmann | b98103a | 2009-02-21 00:09:47 +0100 | [diff] [blame] | 895 | hpet_print_config(); |
Venki Pallipadi | 59c69f2 | 2007-10-12 23:04:23 +0200 | [diff] [blame] | 896 | |
venkatesh.pallipadi@intel.com | 26afe5f | 2008-09-05 18:02:18 -0700 | [diff] [blame] | 897 | for_each_online_cpu(cpu) { |
| 898 | hpet_cpuhp_notify(NULL, CPU_ONLINE, (void *)(long)cpu); |
| 899 | } |
| 900 | |
| 901 | /* This notifier should be called after workqueue is ready */ |
| 902 | hotcpu_notifier(hpet_cpuhp_notify, -20); |
| 903 | |
Thomas Gleixner | 2876914 | 2007-10-12 23:04:06 +0200 | [diff] [blame] | 904 | return 0; |
| 905 | } |
| 906 | fs_initcall(hpet_late_init); |
| 907 | |
OGAWA Hirofumi | c86c7fb | 2007-12-03 17:17:10 +0100 | [diff] [blame] | 908 | void hpet_disable(void) |
| 909 | { |
| 910 | if (is_hpet_capable()) { |
| 911 | unsigned long cfg = hpet_readl(HPET_CFG); |
| 912 | |
| 913 | if (hpet_legacy_int_enabled) { |
| 914 | cfg &= ~HPET_CFG_LEGACY; |
| 915 | hpet_legacy_int_enabled = 0; |
| 916 | } |
| 917 | cfg &= ~HPET_CFG_ENABLE; |
| 918 | hpet_writel(cfg, HPET_CFG); |
| 919 | } |
| 920 | } |
| 921 | |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 922 | #ifdef CONFIG_HPET_EMULATE_RTC |
| 923 | |
| 924 | /* HPET in LegacyReplacement Mode eats up RTC interrupt line. When, HPET |
| 925 | * is enabled, we support RTC interrupt functionality in software. |
| 926 | * RTC has 3 kinds of interrupts: |
| 927 | * 1) Update Interrupt - generate an interrupt, every sec, when RTC clock |
| 928 | * is updated |
| 929 | * 2) Alarm Interrupt - generate an interrupt at a specific time of day |
| 930 | * 3) Periodic Interrupt - generate periodic interrupt, with frequencies |
| 931 | * 2Hz-8192Hz (2Hz-64Hz for non-root user) (all freqs in powers of 2) |
| 932 | * (1) and (2) above are implemented using polling at a frequency of |
| 933 | * 64 Hz. The exact frequency is a tradeoff between accuracy and interrupt |
| 934 | * overhead. (DEFAULT_RTC_INT_FREQ) |
| 935 | * For (3), we use interrupts at 64Hz or user specified periodic |
| 936 | * frequency, whichever is higher. |
| 937 | */ |
| 938 | #include <linux/mc146818rtc.h> |
| 939 | #include <linux/rtc.h> |
Bernhard Walle | 1bdbdaa | 2008-01-30 13:33:28 +0100 | [diff] [blame] | 940 | #include <asm/rtc.h> |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 941 | |
| 942 | #define DEFAULT_RTC_INT_FREQ 64 |
| 943 | #define DEFAULT_RTC_SHIFT 6 |
| 944 | #define RTC_NUM_INTS 1 |
| 945 | |
| 946 | static unsigned long hpet_rtc_flags; |
David Brownell | 7e2a31d | 2008-07-23 21:30:47 -0700 | [diff] [blame] | 947 | static int hpet_prev_update_sec; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 948 | static struct rtc_time hpet_alarm_time; |
| 949 | static unsigned long hpet_pie_count; |
Pavel Emelyanov | ff08f76 | 2009-02-04 13:40:31 +0300 | [diff] [blame] | 950 | static u32 hpet_t1_cmp; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 951 | static unsigned long hpet_default_delta; |
| 952 | static unsigned long hpet_pie_delta; |
| 953 | static unsigned long hpet_pie_limit; |
| 954 | |
Bernhard Walle | 1bdbdaa | 2008-01-30 13:33:28 +0100 | [diff] [blame] | 955 | static rtc_irq_handler irq_handler; |
| 956 | |
| 957 | /* |
Pavel Emelyanov | ff08f76 | 2009-02-04 13:40:31 +0300 | [diff] [blame] | 958 | * Check that the hpet counter c1 is ahead of the c2 |
| 959 | */ |
| 960 | static inline int hpet_cnt_ahead(u32 c1, u32 c2) |
| 961 | { |
| 962 | return (s32)(c2 - c1) < 0; |
| 963 | } |
| 964 | |
| 965 | /* |
Bernhard Walle | 1bdbdaa | 2008-01-30 13:33:28 +0100 | [diff] [blame] | 966 | * Registers a IRQ handler. |
| 967 | */ |
| 968 | int hpet_register_irq_handler(rtc_irq_handler handler) |
| 969 | { |
| 970 | if (!is_hpet_enabled()) |
| 971 | return -ENODEV; |
| 972 | if (irq_handler) |
| 973 | return -EBUSY; |
| 974 | |
| 975 | irq_handler = handler; |
| 976 | |
| 977 | return 0; |
| 978 | } |
| 979 | EXPORT_SYMBOL_GPL(hpet_register_irq_handler); |
| 980 | |
| 981 | /* |
| 982 | * Deregisters the IRQ handler registered with hpet_register_irq_handler() |
| 983 | * and does cleanup. |
| 984 | */ |
| 985 | void hpet_unregister_irq_handler(rtc_irq_handler handler) |
| 986 | { |
| 987 | if (!is_hpet_enabled()) |
| 988 | return; |
| 989 | |
| 990 | irq_handler = NULL; |
| 991 | hpet_rtc_flags = 0; |
| 992 | } |
| 993 | EXPORT_SYMBOL_GPL(hpet_unregister_irq_handler); |
| 994 | |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 995 | /* |
| 996 | * Timer 1 for RTC emulation. We use one shot mode, as periodic mode |
| 997 | * is not supported by all HPET implementations for timer 1. |
| 998 | * |
| 999 | * hpet_rtc_timer_init() is called when the rtc is initialized. |
| 1000 | */ |
| 1001 | int hpet_rtc_timer_init(void) |
| 1002 | { |
| 1003 | unsigned long cfg, cnt, delta, flags; |
| 1004 | |
| 1005 | if (!is_hpet_enabled()) |
| 1006 | return 0; |
| 1007 | |
| 1008 | if (!hpet_default_delta) { |
| 1009 | uint64_t clc; |
| 1010 | |
| 1011 | clc = (uint64_t) hpet_clockevent.mult * NSEC_PER_SEC; |
| 1012 | clc >>= hpet_clockevent.shift + DEFAULT_RTC_SHIFT; |
| 1013 | hpet_default_delta = (unsigned long) clc; |
| 1014 | } |
| 1015 | |
| 1016 | if (!(hpet_rtc_flags & RTC_PIE) || hpet_pie_limit) |
| 1017 | delta = hpet_default_delta; |
| 1018 | else |
| 1019 | delta = hpet_pie_delta; |
| 1020 | |
| 1021 | local_irq_save(flags); |
| 1022 | |
| 1023 | cnt = delta + hpet_readl(HPET_COUNTER); |
| 1024 | hpet_writel(cnt, HPET_T1_CMP); |
| 1025 | hpet_t1_cmp = cnt; |
| 1026 | |
| 1027 | cfg = hpet_readl(HPET_T1_CFG); |
| 1028 | cfg &= ~HPET_TN_PERIODIC; |
| 1029 | cfg |= HPET_TN_ENABLE | HPET_TN_32BIT; |
| 1030 | hpet_writel(cfg, HPET_T1_CFG); |
| 1031 | |
| 1032 | local_irq_restore(flags); |
| 1033 | |
| 1034 | return 1; |
| 1035 | } |
Bernhard Walle | 1bdbdaa | 2008-01-30 13:33:28 +0100 | [diff] [blame] | 1036 | EXPORT_SYMBOL_GPL(hpet_rtc_timer_init); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 1037 | |
| 1038 | /* |
| 1039 | * The functions below are called from rtc driver. |
| 1040 | * Return 0 if HPET is not being used. |
| 1041 | * Otherwise do the necessary changes and return 1. |
| 1042 | */ |
| 1043 | int hpet_mask_rtc_irq_bit(unsigned long bit_mask) |
| 1044 | { |
| 1045 | if (!is_hpet_enabled()) |
| 1046 | return 0; |
| 1047 | |
| 1048 | hpet_rtc_flags &= ~bit_mask; |
| 1049 | return 1; |
| 1050 | } |
Bernhard Walle | 1bdbdaa | 2008-01-30 13:33:28 +0100 | [diff] [blame] | 1051 | EXPORT_SYMBOL_GPL(hpet_mask_rtc_irq_bit); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 1052 | |
| 1053 | int hpet_set_rtc_irq_bit(unsigned long bit_mask) |
| 1054 | { |
| 1055 | unsigned long oldbits = hpet_rtc_flags; |
| 1056 | |
| 1057 | if (!is_hpet_enabled()) |
| 1058 | return 0; |
| 1059 | |
| 1060 | hpet_rtc_flags |= bit_mask; |
| 1061 | |
David Brownell | 7e2a31d | 2008-07-23 21:30:47 -0700 | [diff] [blame] | 1062 | if ((bit_mask & RTC_UIE) && !(oldbits & RTC_UIE)) |
| 1063 | hpet_prev_update_sec = -1; |
| 1064 | |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 1065 | if (!oldbits) |
| 1066 | hpet_rtc_timer_init(); |
| 1067 | |
| 1068 | return 1; |
| 1069 | } |
Bernhard Walle | 1bdbdaa | 2008-01-30 13:33:28 +0100 | [diff] [blame] | 1070 | EXPORT_SYMBOL_GPL(hpet_set_rtc_irq_bit); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 1071 | |
| 1072 | int hpet_set_alarm_time(unsigned char hrs, unsigned char min, |
| 1073 | unsigned char sec) |
| 1074 | { |
| 1075 | if (!is_hpet_enabled()) |
| 1076 | return 0; |
| 1077 | |
| 1078 | hpet_alarm_time.tm_hour = hrs; |
| 1079 | hpet_alarm_time.tm_min = min; |
| 1080 | hpet_alarm_time.tm_sec = sec; |
| 1081 | |
| 1082 | return 1; |
| 1083 | } |
Bernhard Walle | 1bdbdaa | 2008-01-30 13:33:28 +0100 | [diff] [blame] | 1084 | EXPORT_SYMBOL_GPL(hpet_set_alarm_time); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 1085 | |
| 1086 | int hpet_set_periodic_freq(unsigned long freq) |
| 1087 | { |
| 1088 | uint64_t clc; |
| 1089 | |
| 1090 | if (!is_hpet_enabled()) |
| 1091 | return 0; |
| 1092 | |
| 1093 | if (freq <= DEFAULT_RTC_INT_FREQ) |
| 1094 | hpet_pie_limit = DEFAULT_RTC_INT_FREQ / freq; |
| 1095 | else { |
| 1096 | clc = (uint64_t) hpet_clockevent.mult * NSEC_PER_SEC; |
| 1097 | do_div(clc, freq); |
| 1098 | clc >>= hpet_clockevent.shift; |
| 1099 | hpet_pie_delta = (unsigned long) clc; |
| 1100 | } |
| 1101 | return 1; |
| 1102 | } |
Bernhard Walle | 1bdbdaa | 2008-01-30 13:33:28 +0100 | [diff] [blame] | 1103 | EXPORT_SYMBOL_GPL(hpet_set_periodic_freq); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 1104 | |
| 1105 | int hpet_rtc_dropped_irq(void) |
| 1106 | { |
| 1107 | return is_hpet_enabled(); |
| 1108 | } |
Bernhard Walle | 1bdbdaa | 2008-01-30 13:33:28 +0100 | [diff] [blame] | 1109 | EXPORT_SYMBOL_GPL(hpet_rtc_dropped_irq); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 1110 | |
| 1111 | static void hpet_rtc_timer_reinit(void) |
| 1112 | { |
| 1113 | unsigned long cfg, delta; |
| 1114 | int lost_ints = -1; |
| 1115 | |
| 1116 | if (unlikely(!hpet_rtc_flags)) { |
| 1117 | cfg = hpet_readl(HPET_T1_CFG); |
| 1118 | cfg &= ~HPET_TN_ENABLE; |
| 1119 | hpet_writel(cfg, HPET_T1_CFG); |
| 1120 | return; |
| 1121 | } |
| 1122 | |
| 1123 | if (!(hpet_rtc_flags & RTC_PIE) || hpet_pie_limit) |
| 1124 | delta = hpet_default_delta; |
| 1125 | else |
| 1126 | delta = hpet_pie_delta; |
| 1127 | |
| 1128 | /* |
| 1129 | * Increment the comparator value until we are ahead of the |
| 1130 | * current count. |
| 1131 | */ |
| 1132 | do { |
| 1133 | hpet_t1_cmp += delta; |
| 1134 | hpet_writel(hpet_t1_cmp, HPET_T1_CMP); |
| 1135 | lost_ints++; |
Pavel Emelyanov | ff08f76 | 2009-02-04 13:40:31 +0300 | [diff] [blame] | 1136 | } while (!hpet_cnt_ahead(hpet_t1_cmp, hpet_readl(HPET_COUNTER))); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 1137 | |
| 1138 | if (lost_ints) { |
| 1139 | if (hpet_rtc_flags & RTC_PIE) |
| 1140 | hpet_pie_count += lost_ints; |
| 1141 | if (printk_ratelimit()) |
David Brownell | 7e2a31d | 2008-07-23 21:30:47 -0700 | [diff] [blame] | 1142 | printk(KERN_WARNING "hpet1: lost %d rtc interrupts\n", |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 1143 | lost_ints); |
| 1144 | } |
| 1145 | } |
| 1146 | |
| 1147 | irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id) |
| 1148 | { |
| 1149 | struct rtc_time curr_time; |
| 1150 | unsigned long rtc_int_flag = 0; |
| 1151 | |
| 1152 | hpet_rtc_timer_reinit(); |
Bernhard Walle | 1bdbdaa | 2008-01-30 13:33:28 +0100 | [diff] [blame] | 1153 | memset(&curr_time, 0, sizeof(struct rtc_time)); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 1154 | |
| 1155 | if (hpet_rtc_flags & (RTC_UIE | RTC_AIE)) |
Bernhard Walle | 1bdbdaa | 2008-01-30 13:33:28 +0100 | [diff] [blame] | 1156 | get_rtc_time(&curr_time); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 1157 | |
| 1158 | if (hpet_rtc_flags & RTC_UIE && |
| 1159 | curr_time.tm_sec != hpet_prev_update_sec) { |
David Brownell | 7e2a31d | 2008-07-23 21:30:47 -0700 | [diff] [blame] | 1160 | if (hpet_prev_update_sec >= 0) |
| 1161 | rtc_int_flag = RTC_UF; |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 1162 | hpet_prev_update_sec = curr_time.tm_sec; |
| 1163 | } |
| 1164 | |
| 1165 | if (hpet_rtc_flags & RTC_PIE && |
| 1166 | ++hpet_pie_count >= hpet_pie_limit) { |
| 1167 | rtc_int_flag |= RTC_PF; |
| 1168 | hpet_pie_count = 0; |
| 1169 | } |
| 1170 | |
Bernhard Walle | 8ee291f | 2008-01-15 16:44:38 +0100 | [diff] [blame] | 1171 | if (hpet_rtc_flags & RTC_AIE && |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 1172 | (curr_time.tm_sec == hpet_alarm_time.tm_sec) && |
| 1173 | (curr_time.tm_min == hpet_alarm_time.tm_min) && |
| 1174 | (curr_time.tm_hour == hpet_alarm_time.tm_hour)) |
| 1175 | rtc_int_flag |= RTC_AF; |
| 1176 | |
| 1177 | if (rtc_int_flag) { |
| 1178 | rtc_int_flag |= (RTC_IRQF | (RTC_NUM_INTS << 8)); |
Bernhard Walle | 1bdbdaa | 2008-01-30 13:33:28 +0100 | [diff] [blame] | 1179 | if (irq_handler) |
| 1180 | irq_handler(rtc_int_flag, dev_id); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 1181 | } |
| 1182 | return IRQ_HANDLED; |
| 1183 | } |
Bernhard Walle | 1bdbdaa | 2008-01-30 13:33:28 +0100 | [diff] [blame] | 1184 | EXPORT_SYMBOL_GPL(hpet_rtc_interrupt); |
Thomas Gleixner | e9e2cdb | 2007-02-16 01:28:04 -0800 | [diff] [blame] | 1185 | #endif |