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Commit 76832c28de4fabbf32fe1e5a25194724a3430070

Authored by Dimitri Sivanich
Committed by Linus Torvalds
1 parent c0e7dcc8bc
Exists in master and in 7 other branches imx_3.0.35_4.1.0, imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga, smarc-l5.0.0_1.0.0-ga

[PATCH] shrink mmtimer memory size 

This greatly reduces the amount of memory used by mmtimer on smaller
machines with large values of MAX_COMPACT_NODES.

Signed-off-by: Dimitri Sivanich <sivanich@sgi.com>
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Showing 1 changed file with 57 additions and 33 deletions Inline Diff

drivers/char/mmtimer.c
Diff comments   View file @ 76832c2
1 /* 1 /*
2 * Intel Multimedia Timer device implementation for SGI SN platforms. 2 * Timer device implementation for SGI SN platforms.
3 * 3 *
4 * This file is subject to the terms and conditions of the GNU General Public 4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive 5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details. 6 * for more details.
7 * 7 *
8 * Copyright (c) 2001-2004 Silicon Graphics, Inc. All rights reserved. 8 * Copyright (c) 2001-2006 Silicon Graphics, Inc. All rights reserved.
9 * 9 *
10 * This driver exports an API that should be supportable by any HPET or IA-PC 10 * This driver exports an API that should be supportable by any HPET or IA-PC
11 * multimedia timer. The code below is currently specific to the SGI Altix 11 * multimedia timer. The code below is currently specific to the SGI Altix
12 * SHub RTC, however. 12 * SHub RTC, however.
13 * 13 *
14 * 11/01/01 - jbarnes - initial revision 14 * 11/01/01 - jbarnes - initial revision
15 * 9/10/04 - Christoph Lameter - remove interrupt support for kernel inclusion 15 * 9/10/04 - Christoph Lameter - remove interrupt support for kernel inclusion
16 * 10/1/04 - Christoph Lameter - provide posix clock CLOCK_SGI_CYCLE 16 * 10/1/04 - Christoph Lameter - provide posix clock CLOCK_SGI_CYCLE
17 * 10/13/04 - Christoph Lameter, Dimitri Sivanich - provide timer interrupt 17 * 10/13/04 - Christoph Lameter, Dimitri Sivanich - provide timer interrupt
18 * support via the posix timer interface 18 * support via the posix timer interface
19 */ 19 */
20 20
21 #include <linux/types.h> 21 #include <linux/types.h>
22 #include <linux/kernel.h> 22 #include <linux/kernel.h>
23 #include <linux/ioctl.h> 23 #include <linux/ioctl.h>
24 #include <linux/module.h> 24 #include <linux/module.h>
25 #include <linux/init.h> 25 #include <linux/init.h>
26 #include <linux/errno.h> 26 #include <linux/errno.h>
27 #include <linux/mm.h> 27 #include <linux/mm.h>
28 #include <linux/devfs_fs_kernel.h> 28 #include <linux/devfs_fs_kernel.h>
29 #include <linux/mmtimer.h> 29 #include <linux/mmtimer.h>
30 #include <linux/miscdevice.h> 30 #include <linux/miscdevice.h>
31 #include <linux/posix-timers.h> 31 #include <linux/posix-timers.h>
32 #include <linux/interrupt.h> 32 #include <linux/interrupt.h>
33 33
34 #include <asm/uaccess.h> 34 #include <asm/uaccess.h>
35 #include <asm/sn/addrs.h> 35 #include <asm/sn/addrs.h>
36 #include <asm/sn/intr.h> 36 #include <asm/sn/intr.h>
37 #include <asm/sn/shub_mmr.h> 37 #include <asm/sn/shub_mmr.h>
38 #include <asm/sn/nodepda.h> 38 #include <asm/sn/nodepda.h>
39 #include <asm/sn/shubio.h> 39 #include <asm/sn/shubio.h>
40 40
41 MODULE_AUTHOR("Jesse Barnes <jbarnes@sgi.com>"); 41 MODULE_AUTHOR("Jesse Barnes <jbarnes@sgi.com>");
42 MODULE_DESCRIPTION("SGI Altix RTC Timer"); 42 MODULE_DESCRIPTION("SGI Altix RTC Timer");
43 MODULE_LICENSE("GPL"); 43 MODULE_LICENSE("GPL");
44 44
45 /* name of the device, usually in /dev */ 45 /* name of the device, usually in /dev */
46 #define MMTIMER_NAME "mmtimer" 46 #define MMTIMER_NAME "mmtimer"
47 #define MMTIMER_DESC "SGI Altix RTC Timer" 47 #define MMTIMER_DESC "SGI Altix RTC Timer"
48 #define MMTIMER_VERSION "2.0" 48 #define MMTIMER_VERSION "2.1"
49 49
50 #define RTC_BITS 55 /* 55 bits for this implementation */ 50 #define RTC_BITS 55 /* 55 bits for this implementation */
51 51
52 extern unsigned long sn_rtc_cycles_per_second; 52 extern unsigned long sn_rtc_cycles_per_second;
53 53
54 #define RTC_COUNTER_ADDR ((long *)LOCAL_MMR_ADDR(SH_RTC)) 54 #define RTC_COUNTER_ADDR ((long *)LOCAL_MMR_ADDR(SH_RTC))
55 55
56 #define rtc_time() (*RTC_COUNTER_ADDR) 56 #define rtc_time() (*RTC_COUNTER_ADDR)
57 57
58 static int mmtimer_ioctl(struct inode *inode, struct file *file, 58 static int mmtimer_ioctl(struct inode *inode, struct file *file,
59 unsigned int cmd, unsigned long arg); 59 unsigned int cmd, unsigned long arg);
60 static int mmtimer_mmap(struct file *file, struct vm_area_struct *vma); 60 static int mmtimer_mmap(struct file *file, struct vm_area_struct *vma);
61 61
62 /* 62 /*
63 * Period in femtoseconds (10^-15 s) 63 * Period in femtoseconds (10^-15 s)
64 */ 64 */
65 static unsigned long mmtimer_femtoperiod = 0; 65 static unsigned long mmtimer_femtoperiod = 0;
66 66
67 static struct file_operations mmtimer_fops = { 67 static struct file_operations mmtimer_fops = {
68 .owner = THIS_MODULE, 68 .owner = THIS_MODULE,
69 .mmap = mmtimer_mmap, 69 .mmap = mmtimer_mmap,
70 .ioctl = mmtimer_ioctl, 70 .ioctl = mmtimer_ioctl,
71 }; 71 };
72 72
73 /* 73 /*
74 * We only have comparison registers RTC1-4 currently available per 74 * We only have comparison registers RTC1-4 currently available per
75 * node. RTC0 is used by SAL. 75 * node. RTC0 is used by SAL.
76 */ 76 */
77 #define NUM_COMPARATORS 3 77 #define NUM_COMPARATORS 3
78 /* Check for an RTC interrupt pending */ 78 /* Check for an RTC interrupt pending */
79 static int inline mmtimer_int_pending(int comparator) 79 static int inline mmtimer_int_pending(int comparator)
80 { 80 {
81 if (HUB_L((unsigned long *)LOCAL_MMR_ADDR(SH_EVENT_OCCURRED)) & 81 if (HUB_L((unsigned long *)LOCAL_MMR_ADDR(SH_EVENT_OCCURRED)) &
82 SH_EVENT_OCCURRED_RTC1_INT_MASK << comparator) 82 SH_EVENT_OCCURRED_RTC1_INT_MASK << comparator)
83 return 1; 83 return 1;
84 else 84 else
85 return 0; 85 return 0;
86 } 86 }
87 /* Clear the RTC interrupt pending bit */ 87 /* Clear the RTC interrupt pending bit */
88 static void inline mmtimer_clr_int_pending(int comparator) 88 static void inline mmtimer_clr_int_pending(int comparator)
89 { 89 {
90 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_EVENT_OCCURRED_ALIAS), 90 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_EVENT_OCCURRED_ALIAS),
91 SH_EVENT_OCCURRED_RTC1_INT_MASK << comparator); 91 SH_EVENT_OCCURRED_RTC1_INT_MASK << comparator);
92 } 92 }
93 93
94 /* Setup timer on comparator RTC1 */ 94 /* Setup timer on comparator RTC1 */
95 static void inline mmtimer_setup_int_0(u64 expires) 95 static void inline mmtimer_setup_int_0(u64 expires)
96 { 96 {
97 u64 val; 97 u64 val;
98 98
99 /* Disable interrupt */ 99 /* Disable interrupt */
100 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC1_INT_ENABLE), 0UL); 100 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC1_INT_ENABLE), 0UL);
101 101
102 /* Initialize comparator value */ 102 /* Initialize comparator value */
103 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_INT_CMPB), -1L); 103 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_INT_CMPB), -1L);
104 104
105 /* Clear pending bit */ 105 /* Clear pending bit */
106 mmtimer_clr_int_pending(0); 106 mmtimer_clr_int_pending(0);
107 107
108 val = ((u64)SGI_MMTIMER_VECTOR << SH_RTC1_INT_CONFIG_IDX_SHFT) | 108 val = ((u64)SGI_MMTIMER_VECTOR << SH_RTC1_INT_CONFIG_IDX_SHFT) |
109 ((u64)cpu_physical_id(smp_processor_id()) << 109 ((u64)cpu_physical_id(smp_processor_id()) <<
110 SH_RTC1_INT_CONFIG_PID_SHFT); 110 SH_RTC1_INT_CONFIG_PID_SHFT);
111 111
112 /* Set configuration */ 112 /* Set configuration */
113 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC1_INT_CONFIG), val); 113 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC1_INT_CONFIG), val);
114 114
115 /* Enable RTC interrupts */ 115 /* Enable RTC interrupts */
116 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC1_INT_ENABLE), 1UL); 116 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC1_INT_ENABLE), 1UL);
117 117
118 /* Initialize comparator value */ 118 /* Initialize comparator value */
119 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_INT_CMPB), expires); 119 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_INT_CMPB), expires);
120 120
121 121
122 } 122 }
123 123
124 /* Setup timer on comparator RTC2 */ 124 /* Setup timer on comparator RTC2 */
125 static void inline mmtimer_setup_int_1(u64 expires) 125 static void inline mmtimer_setup_int_1(u64 expires)
126 { 126 {
127 u64 val; 127 u64 val;
128 128
129 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC2_INT_ENABLE), 0UL); 129 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC2_INT_ENABLE), 0UL);
130 130
131 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_INT_CMPC), -1L); 131 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_INT_CMPC), -1L);
132 132
133 mmtimer_clr_int_pending(1); 133 mmtimer_clr_int_pending(1);
134 134
135 val = ((u64)SGI_MMTIMER_VECTOR << SH_RTC2_INT_CONFIG_IDX_SHFT) | 135 val = ((u64)SGI_MMTIMER_VECTOR << SH_RTC2_INT_CONFIG_IDX_SHFT) |
136 ((u64)cpu_physical_id(smp_processor_id()) << 136 ((u64)cpu_physical_id(smp_processor_id()) <<
137 SH_RTC2_INT_CONFIG_PID_SHFT); 137 SH_RTC2_INT_CONFIG_PID_SHFT);
138 138
139 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC2_INT_CONFIG), val); 139 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC2_INT_CONFIG), val);
140 140
141 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC2_INT_ENABLE), 1UL); 141 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC2_INT_ENABLE), 1UL);
142 142
143 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_INT_CMPC), expires); 143 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_INT_CMPC), expires);
144 } 144 }
145 145
146 /* Setup timer on comparator RTC3 */ 146 /* Setup timer on comparator RTC3 */
147 static void inline mmtimer_setup_int_2(u64 expires) 147 static void inline mmtimer_setup_int_2(u64 expires)
148 { 148 {
149 u64 val; 149 u64 val;
150 150
151 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC3_INT_ENABLE), 0UL); 151 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC3_INT_ENABLE), 0UL);
152 152
153 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_INT_CMPD), -1L); 153 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_INT_CMPD), -1L);
154 154
155 mmtimer_clr_int_pending(2); 155 mmtimer_clr_int_pending(2);
156 156
157 val = ((u64)SGI_MMTIMER_VECTOR << SH_RTC3_INT_CONFIG_IDX_SHFT) | 157 val = ((u64)SGI_MMTIMER_VECTOR << SH_RTC3_INT_CONFIG_IDX_SHFT) |
158 ((u64)cpu_physical_id(smp_processor_id()) << 158 ((u64)cpu_physical_id(smp_processor_id()) <<
159 SH_RTC3_INT_CONFIG_PID_SHFT); 159 SH_RTC3_INT_CONFIG_PID_SHFT);
160 160
161 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC3_INT_CONFIG), val); 161 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC3_INT_CONFIG), val);
162 162
163 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC3_INT_ENABLE), 1UL); 163 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC3_INT_ENABLE), 1UL);
164 164
165 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_INT_CMPD), expires); 165 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_INT_CMPD), expires);
166 } 166 }
167 167
168 /* 168 /*
169 * This function must be called with interrupts disabled and preemption off 169 * This function must be called with interrupts disabled and preemption off
170 * in order to insure that the setup succeeds in a deterministic time frame. 170 * in order to insure that the setup succeeds in a deterministic time frame.
171 * It will check if the interrupt setup succeeded. 171 * It will check if the interrupt setup succeeded.
172 */ 172 */
173 static int inline mmtimer_setup(int comparator, unsigned long expires) 173 static int inline mmtimer_setup(int comparator, unsigned long expires)
174 { 174 {
175 175
176 switch (comparator) { 176 switch (comparator) {
177 case 0: 177 case 0:
178 mmtimer_setup_int_0(expires); 178 mmtimer_setup_int_0(expires);
179 break; 179 break;
180 case 1: 180 case 1:
181 mmtimer_setup_int_1(expires); 181 mmtimer_setup_int_1(expires);
182 break; 182 break;
183 case 2: 183 case 2:
184 mmtimer_setup_int_2(expires); 184 mmtimer_setup_int_2(expires);
185 break; 185 break;
186 } 186 }
187 /* We might've missed our expiration time */ 187 /* We might've missed our expiration time */
188 if (rtc_time() < expires) 188 if (rtc_time() < expires)
189 return 1; 189 return 1;
190 190
191 /* 191 /*
192 * If an interrupt is already pending then its okay 192 * If an interrupt is already pending then its okay
193 * if not then we failed 193 * if not then we failed
194 */ 194 */
195 return mmtimer_int_pending(comparator); 195 return mmtimer_int_pending(comparator);
196 } 196 }
197 197
198 static int inline mmtimer_disable_int(long nasid, int comparator) 198 static int inline mmtimer_disable_int(long nasid, int comparator)
199 { 199 {
200 switch (comparator) { 200 switch (comparator) {
201 case 0: 201 case 0:
202 nasid == -1 ? HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC1_INT_ENABLE), 202 nasid == -1 ? HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC1_INT_ENABLE),
203 0UL) : REMOTE_HUB_S(nasid, SH_RTC1_INT_ENABLE, 0UL); 203 0UL) : REMOTE_HUB_S(nasid, SH_RTC1_INT_ENABLE, 0UL);
204 break; 204 break;
205 case 1: 205 case 1:
206 nasid == -1 ? HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC2_INT_ENABLE), 206 nasid == -1 ? HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC2_INT_ENABLE),
207 0UL) : REMOTE_HUB_S(nasid, SH_RTC2_INT_ENABLE, 0UL); 207 0UL) : REMOTE_HUB_S(nasid, SH_RTC2_INT_ENABLE, 0UL);
208 break; 208 break;
209 case 2: 209 case 2:
210 nasid == -1 ? HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC3_INT_ENABLE), 210 nasid == -1 ? HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC3_INT_ENABLE),
211 0UL) : REMOTE_HUB_S(nasid, SH_RTC3_INT_ENABLE, 0UL); 211 0UL) : REMOTE_HUB_S(nasid, SH_RTC3_INT_ENABLE, 0UL);
212 break; 212 break;
213 default: 213 default:
214 return -EFAULT; 214 return -EFAULT;
215 } 215 }
216 return 0; 216 return 0;
217 } 217 }
218 218
219 #define TIMER_OFF 0xbadcabLL 219 #define TIMER_OFF 0xbadcabLL
220 220
221 /* There is one of these for each comparator */ 221 /* There is one of these for each comparator */
222 typedef struct mmtimer { 222 typedef struct mmtimer {
223 spinlock_t lock ____cacheline_aligned; 223 spinlock_t lock ____cacheline_aligned;
224 struct k_itimer *timer; 224 struct k_itimer *timer;
225 int i; 225 int i;
226 int cpu; 226 int cpu;
227 struct tasklet_struct tasklet; 227 struct tasklet_struct tasklet;
228 } mmtimer_t; 228 } mmtimer_t;
229 229
230 /* 230 static mmtimer_t ** timers;
231 * Total number of comparators is comparators/node * MAX nodes/running kernel
232 */
233 static mmtimer_t timers[NUM_COMPARATORS*MAX_COMPACT_NODES];
234 231
235 /** 232 /**
236 * mmtimer_ioctl - ioctl interface for /dev/mmtimer 233 * mmtimer_ioctl - ioctl interface for /dev/mmtimer
237 * @inode: inode of the device 234 * @inode: inode of the device
238 * @file: file structure for the device 235 * @file: file structure for the device
239 * @cmd: command to execute 236 * @cmd: command to execute
240 * @arg: optional argument to command 237 * @arg: optional argument to command
241 * 238 *
242 * Executes the command specified by @cmd. Returns 0 for success, < 0 for 239 * Executes the command specified by @cmd. Returns 0 for success, < 0 for
243 * failure. 240 * failure.
244 * 241 *
245 * Valid commands: 242 * Valid commands:
246 * 243 *
247 * %MMTIMER_GETOFFSET - Should return the offset (relative to the start 244 * %MMTIMER_GETOFFSET - Should return the offset (relative to the start
248 * of the page where the registers are mapped) for the counter in question. 245 * of the page where the registers are mapped) for the counter in question.
249 * 246 *
250 * %MMTIMER_GETRES - Returns the resolution of the clock in femto (10^-15) 247 * %MMTIMER_GETRES - Returns the resolution of the clock in femto (10^-15)
251 * seconds 248 * seconds
252 * 249 *
253 * %MMTIMER_GETFREQ - Copies the frequency of the clock in Hz to the address 250 * %MMTIMER_GETFREQ - Copies the frequency of the clock in Hz to the address
254 * specified by @arg 251 * specified by @arg
255 * 252 *
256 * %MMTIMER_GETBITS - Returns the number of bits in the clock's counter 253 * %MMTIMER_GETBITS - Returns the number of bits in the clock's counter
257 * 254 *
258 * %MMTIMER_MMAPAVAIL - Returns 1 if the registers can be mmap'd into userspace 255 * %MMTIMER_MMAPAVAIL - Returns 1 if the registers can be mmap'd into userspace
259 * 256 *
260 * %MMTIMER_GETCOUNTER - Gets the current value in the counter and places it 257 * %MMTIMER_GETCOUNTER - Gets the current value in the counter and places it
261 * in the address specified by @arg. 258 * in the address specified by @arg.
262 */ 259 */
263 static int mmtimer_ioctl(struct inode *inode, struct file *file, 260 static int mmtimer_ioctl(struct inode *inode, struct file *file,
264 unsigned int cmd, unsigned long arg) 261 unsigned int cmd, unsigned long arg)
265 { 262 {
266 int ret = 0; 263 int ret = 0;
267 264
268 switch (cmd) { 265 switch (cmd) {
269 case MMTIMER_GETOFFSET: /* offset of the counter */ 266 case MMTIMER_GETOFFSET: /* offset of the counter */
270 /* 267 /*
271 * SN RTC registers are on their own 64k page 268 * SN RTC registers are on their own 64k page
272 */ 269 */
273 if(PAGE_SIZE <= (1 << 16)) 270 if(PAGE_SIZE <= (1 << 16))
274 ret = (((long)RTC_COUNTER_ADDR) & (PAGE_SIZE-1)) / 8; 271 ret = (((long)RTC_COUNTER_ADDR) & (PAGE_SIZE-1)) / 8;
275 else 272 else
276 ret = -ENOSYS; 273 ret = -ENOSYS;
277 break; 274 break;
278 275
279 case MMTIMER_GETRES: /* resolution of the clock in 10^-15 s */ 276 case MMTIMER_GETRES: /* resolution of the clock in 10^-15 s */
280 if(copy_to_user((unsigned long __user *)arg, 277 if(copy_to_user((unsigned long __user *)arg,
281 &mmtimer_femtoperiod, sizeof(unsigned long))) 278 &mmtimer_femtoperiod, sizeof(unsigned long)))
282 return -EFAULT; 279 return -EFAULT;
283 break; 280 break;
284 281
285 case MMTIMER_GETFREQ: /* frequency in Hz */ 282 case MMTIMER_GETFREQ: /* frequency in Hz */
286 if(copy_to_user((unsigned long __user *)arg, 283 if(copy_to_user((unsigned long __user *)arg,
287 &sn_rtc_cycles_per_second, 284 &sn_rtc_cycles_per_second,
288 sizeof(unsigned long))) 285 sizeof(unsigned long)))
289 return -EFAULT; 286 return -EFAULT;
290 ret = 0; 287 ret = 0;
291 break; 288 break;
292 289
293 case MMTIMER_GETBITS: /* number of bits in the clock */ 290 case MMTIMER_GETBITS: /* number of bits in the clock */
294 ret = RTC_BITS; 291 ret = RTC_BITS;
295 break; 292 break;
296 293
297 case MMTIMER_MMAPAVAIL: /* can we mmap the clock into userspace? */ 294 case MMTIMER_MMAPAVAIL: /* can we mmap the clock into userspace? */
298 ret = (PAGE_SIZE <= (1 << 16)) ? 1 : 0; 295 ret = (PAGE_SIZE <= (1 << 16)) ? 1 : 0;
299 break; 296 break;
300 297
301 case MMTIMER_GETCOUNTER: 298 case MMTIMER_GETCOUNTER:
302 if(copy_to_user((unsigned long __user *)arg, 299 if(copy_to_user((unsigned long __user *)arg,
303 RTC_COUNTER_ADDR, sizeof(unsigned long))) 300 RTC_COUNTER_ADDR, sizeof(unsigned long)))
304 return -EFAULT; 301 return -EFAULT;
305 break; 302 break;
306 default: 303 default:
307 ret = -ENOSYS; 304 ret = -ENOSYS;
308 break; 305 break;
309 } 306 }
310 307
311 return ret; 308 return ret;
312 } 309 }
313 310
314 /** 311 /**
315 * mmtimer_mmap - maps the clock's registers into userspace 312 * mmtimer_mmap - maps the clock's registers into userspace
316 * @file: file structure for the device 313 * @file: file structure for the device
317 * @vma: VMA to map the registers into 314 * @vma: VMA to map the registers into
318 * 315 *
319 * Calls remap_pfn_range() to map the clock's registers into 316 * Calls remap_pfn_range() to map the clock's registers into
320 * the calling process' address space. 317 * the calling process' address space.
321 */ 318 */
322 static int mmtimer_mmap(struct file *file, struct vm_area_struct *vma) 319 static int mmtimer_mmap(struct file *file, struct vm_area_struct *vma)
323 { 320 {
324 unsigned long mmtimer_addr; 321 unsigned long mmtimer_addr;
325 322
326 if (vma->vm_end - vma->vm_start != PAGE_SIZE) 323 if (vma->vm_end - vma->vm_start != PAGE_SIZE)
327 return -EINVAL; 324 return -EINVAL;
328 325
329 if (vma->vm_flags & VM_WRITE) 326 if (vma->vm_flags & VM_WRITE)
330 return -EPERM; 327 return -EPERM;
331 328
332 if (PAGE_SIZE > (1 << 16)) 329 if (PAGE_SIZE > (1 << 16))
333 return -ENOSYS; 330 return -ENOSYS;
334 331
335 vma->vm_flags |= (VM_IO | VM_SHM | VM_LOCKED ); 332 vma->vm_flags |= (VM_IO | VM_SHM | VM_LOCKED );
336 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 333 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
337 334
338 mmtimer_addr = __pa(RTC_COUNTER_ADDR); 335 mmtimer_addr = __pa(RTC_COUNTER_ADDR);
339 mmtimer_addr &= ~(PAGE_SIZE - 1); 336 mmtimer_addr &= ~(PAGE_SIZE - 1);
340 mmtimer_addr &= 0xfffffffffffffffUL; 337 mmtimer_addr &= 0xfffffffffffffffUL;
341 338
342 if (remap_pfn_range(vma, vma->vm_start, mmtimer_addr >> PAGE_SHIFT, 339 if (remap_pfn_range(vma, vma->vm_start, mmtimer_addr >> PAGE_SHIFT,
343 PAGE_SIZE, vma->vm_page_prot)) { 340 PAGE_SIZE, vma->vm_page_prot)) {
344 printk(KERN_ERR "remap_pfn_range failed in mmtimer.c\n"); 341 printk(KERN_ERR "remap_pfn_range failed in mmtimer.c\n");
345 return -EAGAIN; 342 return -EAGAIN;
346 } 343 }
347 344
348 return 0; 345 return 0;
349 } 346 }
350 347
351 static struct miscdevice mmtimer_miscdev = { 348 static struct miscdevice mmtimer_miscdev = {
352 SGI_MMTIMER, 349 SGI_MMTIMER,
353 MMTIMER_NAME, 350 MMTIMER_NAME,
354 &mmtimer_fops 351 &mmtimer_fops
355 }; 352 };
356 353
357 static struct timespec sgi_clock_offset; 354 static struct timespec sgi_clock_offset;
358 static int sgi_clock_period; 355 static int sgi_clock_period;
359 356
360 /* 357 /*
361 * Posix Timer Interface 358 * Posix Timer Interface
362 */ 359 */
363 360
364 static struct timespec sgi_clock_offset; 361 static struct timespec sgi_clock_offset;
365 static int sgi_clock_period; 362 static int sgi_clock_period;
366 363
367 static int sgi_clock_get(clockid_t clockid, struct timespec *tp) 364 static int sgi_clock_get(clockid_t clockid, struct timespec *tp)
368 { 365 {
369 u64 nsec; 366 u64 nsec;
370 367
371 nsec = rtc_time() * sgi_clock_period 368 nsec = rtc_time() * sgi_clock_period
372 + sgi_clock_offset.tv_nsec; 369 + sgi_clock_offset.tv_nsec;
373 tp->tv_sec = div_long_long_rem(nsec, NSEC_PER_SEC, &tp->tv_nsec) 370 tp->tv_sec = div_long_long_rem(nsec, NSEC_PER_SEC, &tp->tv_nsec)
374 + sgi_clock_offset.tv_sec; 371 + sgi_clock_offset.tv_sec;
375 return 0; 372 return 0;
376 }; 373 };
377 374
378 static int sgi_clock_set(clockid_t clockid, struct timespec *tp) 375 static int sgi_clock_set(clockid_t clockid, struct timespec *tp)
379 { 376 {
380 377
381 u64 nsec; 378 u64 nsec;
382 u64 rem; 379 u64 rem;
383 380
384 nsec = rtc_time() * sgi_clock_period; 381 nsec = rtc_time() * sgi_clock_period;
385 382
386 sgi_clock_offset.tv_sec = tp->tv_sec - div_long_long_rem(nsec, NSEC_PER_SEC, &rem); 383 sgi_clock_offset.tv_sec = tp->tv_sec - div_long_long_rem(nsec, NSEC_PER_SEC, &rem);
387 384
388 if (rem <= tp->tv_nsec) 385 if (rem <= tp->tv_nsec)
389 sgi_clock_offset.tv_nsec = tp->tv_sec - rem; 386 sgi_clock_offset.tv_nsec = tp->tv_sec - rem;
390 else { 387 else {
391 sgi_clock_offset.tv_nsec = tp->tv_sec + NSEC_PER_SEC - rem; 388 sgi_clock_offset.tv_nsec = tp->tv_sec + NSEC_PER_SEC - rem;
392 sgi_clock_offset.tv_sec--; 389 sgi_clock_offset.tv_sec--;
393 } 390 }
394 return 0; 391 return 0;
395 } 392 }
396 393
397 /* 394 /*
398 * Schedule the next periodic interrupt. This function will attempt 395 * Schedule the next periodic interrupt. This function will attempt
399 * to schedule a periodic interrupt later if necessary. If the scheduling 396 * to schedule a periodic interrupt later if necessary. If the scheduling
400 * of an interrupt fails then the time to skip is lengthened 397 * of an interrupt fails then the time to skip is lengthened
401 * exponentially in order to ensure that the next interrupt 398 * exponentially in order to ensure that the next interrupt
402 * can be properly scheduled.. 399 * can be properly scheduled..
403 */ 400 */
404 static int inline reschedule_periodic_timer(mmtimer_t *x) 401 static int inline reschedule_periodic_timer(mmtimer_t *x)
405 { 402 {
406 int n; 403 int n;
407 struct k_itimer *t = x->timer; 404 struct k_itimer *t = x->timer;
408 405
409 t->it.mmtimer.clock = x->i; 406 t->it.mmtimer.clock = x->i;
410 t->it_overrun--; 407 t->it_overrun--;
411 408
412 n = 0; 409 n = 0;
413 do { 410 do {
414 411
415 t->it.mmtimer.expires += t->it.mmtimer.incr << n; 412 t->it.mmtimer.expires += t->it.mmtimer.incr << n;
416 t->it_overrun += 1 << n; 413 t->it_overrun += 1 << n;
417 n++; 414 n++;
418 if (n > 20) 415 if (n > 20)
419 return 1; 416 return 1;
420 417
421 } while (!mmtimer_setup(x->i, t->it.mmtimer.expires)); 418 } while (!mmtimer_setup(x->i, t->it.mmtimer.expires));
422 419
423 return 0; 420 return 0;
424 } 421 }
425 422
426 /** 423 /**
427 * mmtimer_interrupt - timer interrupt handler 424 * mmtimer_interrupt - timer interrupt handler
428 * @irq: irq received 425 * @irq: irq received
429 * @dev_id: device the irq came from 426 * @dev_id: device the irq came from
430 * @regs: register state upon receipt of the interrupt 427 * @regs: register state upon receipt of the interrupt
431 * 428 *
432 * Called when one of the comarators matches the counter, This 429 * Called when one of the comarators matches the counter, This
433 * routine will send signals to processes that have requested 430 * routine will send signals to processes that have requested
434 * them. 431 * them.
435 * 432 *
436 * This interrupt is run in an interrupt context 433 * This interrupt is run in an interrupt context
437 * by the SHUB. It is therefore safe to locally access SHub 434 * by the SHUB. It is therefore safe to locally access SHub
438 * registers. 435 * registers.
439 */ 436 */
440 static irqreturn_t 437 static irqreturn_t
441 mmtimer_interrupt(int irq, void *dev_id, struct pt_regs *regs) 438 mmtimer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
442 { 439 {
443 int i; 440 int i;
444 mmtimer_t *base = timers + cpu_to_node(smp_processor_id()) *
445 NUM_COMPARATORS;
446 unsigned long expires = 0; 441 unsigned long expires = 0;
447 int result = IRQ_NONE; 442 int result = IRQ_NONE;
443 unsigned indx = cpu_to_node(smp_processor_id());
448 444
449 /* 445 /*
450 * Do this once for each comparison register 446 * Do this once for each comparison register
451 */ 447 */
452 for (i = 0; i < NUM_COMPARATORS; i++) { 448 for (i = 0; i < NUM_COMPARATORS; i++) {
449 mmtimer_t *base = timers[indx] + i;
453 /* Make sure this doesn't get reused before tasklet_sched */ 450 /* Make sure this doesn't get reused before tasklet_sched */
454 spin_lock(&base[i].lock); 451 spin_lock(&base->lock);
455 if (base[i].cpu == smp_processor_id()) { 452 if (base->cpu == smp_processor_id()) {
456 if (base[i].timer) 453 if (base->timer)
457 expires = base[i].timer->it.mmtimer.expires; 454 expires = base->timer->it.mmtimer.expires;
458 /* expires test won't work with shared irqs */ 455 /* expires test won't work with shared irqs */
459 if ((mmtimer_int_pending(i) > 0) || 456 if ((mmtimer_int_pending(i) > 0) ||
460 (expires && (expires < rtc_time()))) { 457 (expires && (expires < rtc_time()))) {
461 mmtimer_clr_int_pending(i); 458 mmtimer_clr_int_pending(i);
462 tasklet_schedule(&base[i].tasklet); 459 tasklet_schedule(&base->tasklet);
463 result = IRQ_HANDLED; 460 result = IRQ_HANDLED;
464 } 461 }
465 } 462 }
466 spin_unlock(&base[i].lock); 463 spin_unlock(&base->lock);
467 expires = 0; 464 expires = 0;
468 } 465 }
469 return result; 466 return result;
470 } 467 }
471 468
472 void mmtimer_tasklet(unsigned long data) { 469 void mmtimer_tasklet(unsigned long data) {
473 mmtimer_t *x = (mmtimer_t *)data; 470 mmtimer_t *x = (mmtimer_t *)data;
474 struct k_itimer *t = x->timer; 471 struct k_itimer *t = x->timer;
475 unsigned long flags; 472 unsigned long flags;
476 473
477 if (t == NULL) 474 if (t == NULL)
478 return; 475 return;
479 476
480 /* Send signal and deal with periodic signals */ 477 /* Send signal and deal with periodic signals */
481 spin_lock_irqsave(&t->it_lock, flags); 478 spin_lock_irqsave(&t->it_lock, flags);
482 spin_lock(&x->lock); 479 spin_lock(&x->lock);
483 /* If timer was deleted between interrupt and here, leave */ 480 /* If timer was deleted between interrupt and here, leave */
484 if (t != x->timer) 481 if (t != x->timer)
485 goto out; 482 goto out;
486 t->it_overrun = 0; 483 t->it_overrun = 0;
487 484
488 if (posix_timer_event(t, 0) != 0) { 485 if (posix_timer_event(t, 0) != 0) {
489 486
490 // printk(KERN_WARNING "mmtimer: cannot deliver signal.\n"); 487 // printk(KERN_WARNING "mmtimer: cannot deliver signal.\n");
491 488
492 t->it_overrun++; 489 t->it_overrun++;
493 } 490 }
494 if(t->it.mmtimer.incr) { 491 if(t->it.mmtimer.incr) {
495 /* Periodic timer */ 492 /* Periodic timer */
496 if (reschedule_periodic_timer(x)) { 493 if (reschedule_periodic_timer(x)) {
497 printk(KERN_WARNING "mmtimer: unable to reschedule\n"); 494 printk(KERN_WARNING "mmtimer: unable to reschedule\n");
498 x->timer = NULL; 495 x->timer = NULL;
499 } 496 }
500 } else { 497 } else {
501 /* Ensure we don't false trigger in mmtimer_interrupt */ 498 /* Ensure we don't false trigger in mmtimer_interrupt */
502 t->it.mmtimer.expires = 0; 499 t->it.mmtimer.expires = 0;
503 } 500 }
504 t->it_overrun_last = t->it_overrun; 501 t->it_overrun_last = t->it_overrun;
505 out: 502 out:
506 spin_unlock(&x->lock); 503 spin_unlock(&x->lock);
507 spin_unlock_irqrestore(&t->it_lock, flags); 504 spin_unlock_irqrestore(&t->it_lock, flags);
508 } 505 }
509 506
510 static int sgi_timer_create(struct k_itimer *timer) 507 static int sgi_timer_create(struct k_itimer *timer)
511 { 508 {
512 /* Insure that a newly created timer is off */ 509 /* Insure that a newly created timer is off */
513 timer->it.mmtimer.clock = TIMER_OFF; 510 timer->it.mmtimer.clock = TIMER_OFF;
514 return 0; 511 return 0;
515 } 512 }
516 513
517 /* This does not really delete a timer. It just insures 514 /* This does not really delete a timer. It just insures
518 * that the timer is not active 515 * that the timer is not active
519 * 516 *
520 * Assumption: it_lock is already held with irq's disabled 517 * Assumption: it_lock is already held with irq's disabled
521 */ 518 */
522 static int sgi_timer_del(struct k_itimer *timr) 519 static int sgi_timer_del(struct k_itimer *timr)
523 { 520 {
524 int i = timr->it.mmtimer.clock; 521 int i = timr->it.mmtimer.clock;
525 cnodeid_t nodeid = timr->it.mmtimer.node; 522 cnodeid_t nodeid = timr->it.mmtimer.node;
526 mmtimer_t *t = timers + nodeid * NUM_COMPARATORS +i; 523 mmtimer_t *t = timers[nodeid] + i;
527 unsigned long irqflags; 524 unsigned long irqflags;
528 525
529 if (i != TIMER_OFF) { 526 if (i != TIMER_OFF) {
530 spin_lock_irqsave(&t->lock, irqflags); 527 spin_lock_irqsave(&t->lock, irqflags);
531 mmtimer_disable_int(cnodeid_to_nasid(nodeid),i); 528 mmtimer_disable_int(cnodeid_to_nasid(nodeid),i);
532 t->timer = NULL; 529 t->timer = NULL;
533 timr->it.mmtimer.clock = TIMER_OFF; 530 timr->it.mmtimer.clock = TIMER_OFF;
534 timr->it.mmtimer.expires = 0; 531 timr->it.mmtimer.expires = 0;
535 spin_unlock_irqrestore(&t->lock, irqflags); 532 spin_unlock_irqrestore(&t->lock, irqflags);
536 } 533 }
537 return 0; 534 return 0;
538 } 535 }
539 536
540 #define timespec_to_ns(x) ((x).tv_nsec + (x).tv_sec * NSEC_PER_SEC) 537 #define timespec_to_ns(x) ((x).tv_nsec + (x).tv_sec * NSEC_PER_SEC)
541 #define ns_to_timespec(ts, nsec) (ts).tv_sec = div_long_long_rem(nsec, NSEC_PER_SEC, &(ts).tv_nsec) 538 #define ns_to_timespec(ts, nsec) (ts).tv_sec = div_long_long_rem(nsec, NSEC_PER_SEC, &(ts).tv_nsec)
542 539
543 /* Assumption: it_lock is already held with irq's disabled */ 540 /* Assumption: it_lock is already held with irq's disabled */
544 static void sgi_timer_get(struct k_itimer *timr, struct itimerspec *cur_setting) 541 static void sgi_timer_get(struct k_itimer *timr, struct itimerspec *cur_setting)
545 { 542 {
546 543
547 if (timr->it.mmtimer.clock == TIMER_OFF) { 544 if (timr->it.mmtimer.clock == TIMER_OFF) {
548 cur_setting->it_interval.tv_nsec = 0; 545 cur_setting->it_interval.tv_nsec = 0;
549 cur_setting->it_interval.tv_sec = 0; 546 cur_setting->it_interval.tv_sec = 0;
550 cur_setting->it_value.tv_nsec = 0; 547 cur_setting->it_value.tv_nsec = 0;
551 cur_setting->it_value.tv_sec =0; 548 cur_setting->it_value.tv_sec =0;
552 return; 549 return;
553 } 550 }
554 551
555 ns_to_timespec(cur_setting->it_interval, timr->it.mmtimer.incr * sgi_clock_period); 552 ns_to_timespec(cur_setting->it_interval, timr->it.mmtimer.incr * sgi_clock_period);
556 ns_to_timespec(cur_setting->it_value, (timr->it.mmtimer.expires - rtc_time())* sgi_clock_period); 553 ns_to_timespec(cur_setting->it_value, (timr->it.mmtimer.expires - rtc_time())* sgi_clock_period);
557 return; 554 return;
558 } 555 }
559 556
560 557
561 static int sgi_timer_set(struct k_itimer *timr, int flags, 558 static int sgi_timer_set(struct k_itimer *timr, int flags,
562 struct itimerspec * new_setting, 559 struct itimerspec * new_setting,
563 struct itimerspec * old_setting) 560 struct itimerspec * old_setting)
564 { 561 {
565 562
566 int i; 563 int i;
567 unsigned long when, period, irqflags; 564 unsigned long when, period, irqflags;
568 int err = 0; 565 int err = 0;
569 cnodeid_t nodeid; 566 cnodeid_t nodeid;
570 mmtimer_t *base; 567 mmtimer_t *base;
571 568
572 if (old_setting) 569 if (old_setting)
573 sgi_timer_get(timr, old_setting); 570 sgi_timer_get(timr, old_setting);
574 571
575 sgi_timer_del(timr); 572 sgi_timer_del(timr);
576 when = timespec_to_ns(new_setting->it_value); 573 when = timespec_to_ns(new_setting->it_value);
577 period = timespec_to_ns(new_setting->it_interval); 574 period = timespec_to_ns(new_setting->it_interval);
578 575
579 if (when == 0) 576 if (when == 0)
580 /* Clear timer */ 577 /* Clear timer */
581 return 0; 578 return 0;
582 579
583 if (flags & TIMER_ABSTIME) { 580 if (flags & TIMER_ABSTIME) {
584 struct timespec n; 581 struct timespec n;
585 unsigned long now; 582 unsigned long now;
586 583
587 getnstimeofday(&n); 584 getnstimeofday(&n);
588 now = timespec_to_ns(n); 585 now = timespec_to_ns(n);
589 if (when > now) 586 if (when > now)
590 when -= now; 587 when -= now;
591 else 588 else
592 /* Fire the timer immediately */ 589 /* Fire the timer immediately */
593 when = 0; 590 when = 0;
594 } 591 }
595 592
596 /* 593 /*
597 * Convert to sgi clock period. Need to keep rtc_time() as near as possible 594 * Convert to sgi clock period. Need to keep rtc_time() as near as possible
598 * to getnstimeofday() in order to be as faithful as possible to the time 595 * to getnstimeofday() in order to be as faithful as possible to the time
599 * specified. 596 * specified.
600 */ 597 */
601 when = (when + sgi_clock_period - 1) / sgi_clock_period + rtc_time(); 598 when = (when + sgi_clock_period - 1) / sgi_clock_period + rtc_time();
602 period = (period + sgi_clock_period - 1) / sgi_clock_period; 599 period = (period + sgi_clock_period - 1) / sgi_clock_period;
603 600
604 /* 601 /*
605 * We are allocating a local SHub comparator. If we would be moved to another 602 * We are allocating a local SHub comparator. If we would be moved to another
606 * cpu then another SHub may be local to us. Prohibit that by switching off 603 * cpu then another SHub may be local to us. Prohibit that by switching off
607 * preemption. 604 * preemption.
608 */ 605 */
609 preempt_disable(); 606 preempt_disable();
610 607
611 nodeid = cpu_to_node(smp_processor_id()); 608 nodeid = cpu_to_node(smp_processor_id());
612 base = timers + nodeid * NUM_COMPARATORS;
613 retry: 609 retry:
614 /* Don't use an allocated timer, or a deleted one that's pending */ 610 /* Don't use an allocated timer, or a deleted one that's pending */
615 for(i = 0; i< NUM_COMPARATORS; i++) { 611 for(i = 0; i< NUM_COMPARATORS; i++) {
616 if (!base[i].timer && !base[i].tasklet.state) { 612 base = timers[nodeid] + i;
613 if (!base->timer && !base->tasklet.state) {
617 break; 614 break;
618 } 615 }
619 } 616 }
620 617
621 if (i == NUM_COMPARATORS) { 618 if (i == NUM_COMPARATORS) {
622 preempt_enable(); 619 preempt_enable();
623 return -EBUSY; 620 return -EBUSY;
624 } 621 }
625 622
626 spin_lock_irqsave(&base[i].lock, irqflags); 623 spin_lock_irqsave(&base->lock, irqflags);
627 624
628 if (base[i].timer || base[i].tasklet.state != 0) { 625 if (base->timer || base->tasklet.state != 0) {
629 spin_unlock_irqrestore(&base[i].lock, irqflags); 626 spin_unlock_irqrestore(&base->lock, irqflags);
630 goto retry; 627 goto retry;
631 } 628 }
632 base[i].timer = timr; 629 base->timer = timr;
633 base[i].cpu = smp_processor_id(); 630 base->cpu = smp_processor_id();
634 631
635 timr->it.mmtimer.clock = i; 632 timr->it.mmtimer.clock = i;
636 timr->it.mmtimer.node = nodeid; 633 timr->it.mmtimer.node = nodeid;
637 timr->it.mmtimer.incr = period; 634 timr->it.mmtimer.incr = period;
638 timr->it.mmtimer.expires = when; 635 timr->it.mmtimer.expires = when;
639 636
640 if (period == 0) { 637 if (period == 0) {
641 if (!mmtimer_setup(i, when)) { 638 if (!mmtimer_setup(i, when)) {
642 mmtimer_disable_int(-1, i); 639 mmtimer_disable_int(-1, i);
643 posix_timer_event(timr, 0); 640 posix_timer_event(timr, 0);
644 timr->it.mmtimer.expires = 0; 641 timr->it.mmtimer.expires = 0;
645 } 642 }
646 } else { 643 } else {
647 timr->it.mmtimer.expires -= period; 644 timr->it.mmtimer.expires -= period;
648 if (reschedule_periodic_timer(base+i)) 645 if (reschedule_periodic_timer(base))
649 err = -EINVAL; 646 err = -EINVAL;
650 } 647 }
651 648
652 spin_unlock_irqrestore(&base[i].lock, irqflags); 649 spin_unlock_irqrestore(&base->lock, irqflags);
653 650
654 preempt_enable(); 651 preempt_enable();
655 652
656 return err; 653 return err;
657 } 654 }
658 655
659 static struct k_clock sgi_clock = { 656 static struct k_clock sgi_clock = {
660 .res = 0, 657 .res = 0,
661 .clock_set = sgi_clock_set, 658 .clock_set = sgi_clock_set,
662 .clock_get = sgi_clock_get, 659 .clock_get = sgi_clock_get,
663 .timer_create = sgi_timer_create, 660 .timer_create = sgi_timer_create,
664 .nsleep = do_posix_clock_nonanosleep, 661 .nsleep = do_posix_clock_nonanosleep,
665 .timer_set = sgi_timer_set, 662 .timer_set = sgi_timer_set,
666 .timer_del = sgi_timer_del, 663 .timer_del = sgi_timer_del,
667 .timer_get = sgi_timer_get 664 .timer_get = sgi_timer_get
668 }; 665 };
669 666
670 /** 667 /**
671 * mmtimer_init - device initialization routine 668 * mmtimer_init - device initialization routine
672 * 669 *
673 * Does initial setup for the mmtimer device. 670 * Does initial setup for the mmtimer device.
674 */ 671 */
675 static int __init mmtimer_init(void) 672 static int __init mmtimer_init(void)
676 { 673 {
677 unsigned i; 674 unsigned i;
675 cnodeid_t node, maxn = -1;
678 676
679 if (!ia64_platform_is("sn2")) 677 if (!ia64_platform_is("sn2"))
680 return -1; 678 return -1;
681 679
682 /* 680 /*
683 * Sanity check the cycles/sec variable 681 * Sanity check the cycles/sec variable
684 */ 682 */
685 if (sn_rtc_cycles_per_second < 100000) { 683 if (sn_rtc_cycles_per_second < 100000) {
686 printk(KERN_ERR "%s: unable to determine clock frequency\n", 684 printk(KERN_ERR "%s: unable to determine clock frequency\n",
687 MMTIMER_NAME); 685 MMTIMER_NAME);
688 return -1; 686 return -1;
689 } 687 }
690 688
691 mmtimer_femtoperiod = ((unsigned long)1E15 + sn_rtc_cycles_per_second / 689 mmtimer_femtoperiod = ((unsigned long)1E15 + sn_rtc_cycles_per_second /
692 2) / sn_rtc_cycles_per_second; 690 2) / sn_rtc_cycles_per_second;
693 691
694 for (i=0; i< NUM_COMPARATORS*MAX_COMPACT_NODES; i++) {
695 spin_lock_init(&timers[i].lock);
696 timers[i].timer = NULL;
697 timers[i].cpu = 0;
698 timers[i].i = i % NUM_COMPARATORS;
699 tasklet_init(&timers[i].tasklet, mmtimer_tasklet, (unsigned long) (timers+i));
700 }
701
702 if (request_irq(SGI_MMTIMER_VECTOR, mmtimer_interrupt, SA_PERCPU_IRQ, MMTIMER_NAME, NULL)) { 692 if (request_irq(SGI_MMTIMER_VECTOR, mmtimer_interrupt, SA_PERCPU_IRQ, MMTIMER_NAME, NULL)) {
703 printk(KERN_WARNING "%s: unable to allocate interrupt.", 693 printk(KERN_WARNING "%s: unable to allocate interrupt.",
704 MMTIMER_NAME); 694 MMTIMER_NAME);
705 return -1; 695 return -1;
706 } 696 }
707 697
708 strcpy(mmtimer_miscdev.devfs_name, MMTIMER_NAME); 698 strcpy(mmtimer_miscdev.devfs_name, MMTIMER_NAME);
709 if (misc_register(&mmtimer_miscdev)) { 699 if (misc_register(&mmtimer_miscdev)) {
710 printk(KERN_ERR "%s: failed to register device\n", 700 printk(KERN_ERR "%s: failed to register device\n",
711 MMTIMER_NAME); 701 MMTIMER_NAME);
712 return -1; 702 return -1;
703 }
704
705 /* Get max numbered node, calculate slots needed */
706 for_each_online_node(node) {
707 maxn = node;
708 }
709 maxn++;
710
711 /* Allocate list of node ptrs to mmtimer_t's */
712 timers = kmalloc(sizeof(mmtimer_t *)*maxn, GFP_KERNEL);
713 if (timers == NULL) {
714 printk(KERN_ERR "%s: failed to allocate memory for device\n",
715 MMTIMER_NAME);
716 return -1;
717 }
718
719 /* Allocate mmtimer_t's for each online node */
720 for_each_online_node(node) {
721 timers[node] = kmalloc_node(sizeof(mmtimer_t)*NUM_COMPARATORS, GFP_KERNEL, node);
722 if (timers[node] == NULL) {
723 printk(KERN_ERR "%s: failed to allocate memory for device\n",
724 MMTIMER_NAME);
725 return -1;
726 }
727 for (i=0; i< NUM_COMPARATORS; i++) {
728 mmtimer_t * base = timers[node] + i;
729
730 spin_lock_init(&base->lock);
731 base->timer = NULL;
732 base->cpu = 0;
733 base->i = i;
734 tasklet_init(&base->tasklet, mmtimer_tasklet,
735 (unsigned long) (base));
736 }