Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * Procedures for interfacing to the RTAS on CHRP machines. |
| 4 | * |
| 5 | * Peter Bergner, IBM March 2001. |
| 6 | * Copyright (C) 2001 IBM. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * as published by the Free Software Foundation; either version |
| 11 | * 2 of the License, or (at your option) any later version. |
| 12 | */ |
| 13 | |
| 14 | #include <stdarg.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/types.h> |
| 17 | #include <linux/spinlock.h> |
Paul Gortmaker | 4b16f8e | 2011-07-22 18:24:23 -0400 | [diff] [blame] | 18 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/init.h> |
Randy Dunlap | a941564 | 2006-01-11 12:17:48 -0800 | [diff] [blame] | 20 | #include <linux/capability.h> |
Benjamin Herrenschmidt | 21fe330 | 2005-11-07 16:41:59 +1100 | [diff] [blame] | 21 | #include <linux/delay.h> |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 22 | #include <linux/smp.h> |
| 23 | #include <linux/completion.h> |
| 24 | #include <linux/cpumask.h> |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 25 | #include <linux/memblock.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 26 | #include <linux/slab.h> |
Amerigo Wang | c5f4175 | 2011-07-25 17:13:10 -0700 | [diff] [blame] | 27 | #include <linux/reboot.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
| 29 | #include <asm/prom.h> |
| 30 | #include <asm/rtas.h> |
Michael Ellerman | 31a7f67 | 2006-01-31 17:17:47 +1100 | [diff] [blame] | 31 | #include <asm/hvcall.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <asm/machdep.h> |
Benjamin Herrenschmidt | e822250 | 2006-03-28 23:15:54 +1100 | [diff] [blame] | 33 | #include <asm/firmware.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <asm/page.h> |
| 35 | #include <asm/param.h> |
| 36 | #include <asm/system.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include <asm/delay.h> |
| 38 | #include <asm/uaccess.h> |
Michael Ellerman | 296167a | 2006-01-11 11:54:09 +1100 | [diff] [blame] | 39 | #include <asm/udbg.h> |
Arnd Bergmann | a7f3184 | 2006-03-23 00:00:08 +0100 | [diff] [blame] | 40 | #include <asm/syscalls.h> |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 41 | #include <asm/smp.h> |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 42 | #include <linux/atomic.h> |
Benjamin Herrenschmidt | c4007a2 | 2009-06-16 16:42:50 +0000 | [diff] [blame] | 43 | #include <asm/time.h> |
Brian King | 46db2f8 | 2009-08-28 12:06:29 +0000 | [diff] [blame] | 44 | #include <asm/mmu.h> |
Jesse Larrew | 3b7a27d | 2010-12-01 12:31:26 +0000 | [diff] [blame] | 45 | #include <asm/topology.h> |
Brian King | 9ee820f | 2011-05-04 16:01:20 +1000 | [diff] [blame] | 46 | #include <asm/pSeries_reconfig.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 48 | struct rtas_t rtas = { |
Thomas Gleixner | edc35bd | 2009-12-03 12:38:57 +0100 | [diff] [blame] | 49 | .lock = __ARCH_SPIN_LOCK_UNLOCKED |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | }; |
Michael Ellerman | ab3ab74 | 2006-06-23 18:20:11 +1000 | [diff] [blame] | 51 | EXPORT_SYMBOL(rtas); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | DEFINE_SPINLOCK(rtas_data_buf_lock); |
Michael Ellerman | ab3ab74 | 2006-06-23 18:20:11 +1000 | [diff] [blame] | 54 | EXPORT_SYMBOL(rtas_data_buf_lock); |
| 55 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 56 | char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned; |
Michael Ellerman | ab3ab74 | 2006-06-23 18:20:11 +1000 | [diff] [blame] | 57 | EXPORT_SYMBOL(rtas_data_buf); |
| 58 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | unsigned long rtas_rmo_buf; |
| 60 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 61 | /* |
Paul Mackerras | f4fcbbe | 2005-11-03 14:41:19 +1100 | [diff] [blame] | 62 | * If non-NULL, this gets called when the kernel terminates. |
| 63 | * This is done like this so rtas_flash can be a module. |
| 64 | */ |
| 65 | void (*rtas_flash_term_hook)(int); |
| 66 | EXPORT_SYMBOL(rtas_flash_term_hook); |
| 67 | |
Benjamin Herrenschmidt | f97bb36 | 2009-06-16 16:42:49 +0000 | [diff] [blame] | 68 | /* RTAS use home made raw locking instead of spin_lock_irqsave |
| 69 | * because those can be called from within really nasty contexts |
| 70 | * such as having the timebase stopped which would lockup with |
| 71 | * normal locks and spinlock debugging enabled |
| 72 | */ |
| 73 | static unsigned long lock_rtas(void) |
| 74 | { |
| 75 | unsigned long flags; |
| 76 | |
| 77 | local_irq_save(flags); |
| 78 | preempt_disable(); |
Thomas Gleixner | 0199c4e | 2009-12-02 20:01:25 +0100 | [diff] [blame] | 79 | arch_spin_lock_flags(&rtas.lock, flags); |
Benjamin Herrenschmidt | f97bb36 | 2009-06-16 16:42:49 +0000 | [diff] [blame] | 80 | return flags; |
| 81 | } |
| 82 | |
| 83 | static void unlock_rtas(unsigned long flags) |
| 84 | { |
Thomas Gleixner | 0199c4e | 2009-12-02 20:01:25 +0100 | [diff] [blame] | 85 | arch_spin_unlock(&rtas.lock); |
Benjamin Herrenschmidt | f97bb36 | 2009-06-16 16:42:49 +0000 | [diff] [blame] | 86 | local_irq_restore(flags); |
| 87 | preempt_enable(); |
| 88 | } |
| 89 | |
Paul Mackerras | f4fcbbe | 2005-11-03 14:41:19 +1100 | [diff] [blame] | 90 | /* |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 91 | * call_rtas_display_status and call_rtas_display_status_delay |
| 92 | * are designed only for very early low-level debugging, which |
| 93 | * is why the token is hard-coded to 10. |
| 94 | */ |
Michael Ellerman | 296167a | 2006-01-11 11:54:09 +1100 | [diff] [blame] | 95 | static void call_rtas_display_status(char c) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | { |
| 97 | struct rtas_args *args = &rtas.args; |
| 98 | unsigned long s; |
| 99 | |
| 100 | if (!rtas.base) |
| 101 | return; |
Benjamin Herrenschmidt | f97bb36 | 2009-06-16 16:42:49 +0000 | [diff] [blame] | 102 | s = lock_rtas(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
| 104 | args->token = 10; |
| 105 | args->nargs = 1; |
| 106 | args->nret = 1; |
| 107 | args->rets = (rtas_arg_t *)&(args->args[1]); |
Michael Ellerman | 296167a | 2006-01-11 11:54:09 +1100 | [diff] [blame] | 108 | args->args[0] = (unsigned char)c; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
| 110 | enter_rtas(__pa(args)); |
| 111 | |
Benjamin Herrenschmidt | f97bb36 | 2009-06-16 16:42:49 +0000 | [diff] [blame] | 112 | unlock_rtas(s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | } |
| 114 | |
Michael Ellerman | 296167a | 2006-01-11 11:54:09 +1100 | [diff] [blame] | 115 | static void call_rtas_display_status_delay(char c) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | { |
| 117 | static int pending_newline = 0; /* did last write end with unprinted newline? */ |
| 118 | static int width = 16; |
| 119 | |
| 120 | if (c == '\n') { |
| 121 | while (width-- > 0) |
| 122 | call_rtas_display_status(' '); |
| 123 | width = 16; |
Benjamin Herrenschmidt | 21fe330 | 2005-11-07 16:41:59 +1100 | [diff] [blame] | 124 | mdelay(500); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | pending_newline = 1; |
| 126 | } else { |
| 127 | if (pending_newline) { |
| 128 | call_rtas_display_status('\r'); |
| 129 | call_rtas_display_status('\n'); |
| 130 | } |
| 131 | pending_newline = 0; |
| 132 | if (width--) { |
| 133 | call_rtas_display_status(c); |
| 134 | udelay(10000); |
| 135 | } |
| 136 | } |
| 137 | } |
| 138 | |
Michael Ellerman | cc46bb9 | 2006-06-23 18:20:16 +1000 | [diff] [blame] | 139 | void __init udbg_init_rtas_panel(void) |
Michael Ellerman | 296167a | 2006-01-11 11:54:09 +1100 | [diff] [blame] | 140 | { |
| 141 | udbg_putc = call_rtas_display_status_delay; |
| 142 | } |
| 143 | |
Michael Ellerman | cc46bb9 | 2006-06-23 18:20:16 +1000 | [diff] [blame] | 144 | #ifdef CONFIG_UDBG_RTAS_CONSOLE |
| 145 | |
| 146 | /* If you think you're dying before early_init_dt_scan_rtas() does its |
| 147 | * work, you can hard code the token values for your firmware here and |
| 148 | * hardcode rtas.base/entry etc. |
| 149 | */ |
| 150 | static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE; |
| 151 | static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE; |
| 152 | |
| 153 | static void udbg_rtascon_putc(char c) |
| 154 | { |
| 155 | int tries; |
| 156 | |
| 157 | if (!rtas.base) |
| 158 | return; |
| 159 | |
| 160 | /* Add CRs before LFs */ |
| 161 | if (c == '\n') |
| 162 | udbg_rtascon_putc('\r'); |
| 163 | |
| 164 | /* if there is more than one character to be displayed, wait a bit */ |
| 165 | for (tries = 0; tries < 16; tries++) { |
| 166 | if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0) |
| 167 | break; |
| 168 | udelay(1000); |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | static int udbg_rtascon_getc_poll(void) |
| 173 | { |
| 174 | int c; |
| 175 | |
| 176 | if (!rtas.base) |
| 177 | return -1; |
| 178 | |
| 179 | if (rtas_call(rtas_getchar_token, 0, 2, &c)) |
| 180 | return -1; |
| 181 | |
| 182 | return c; |
| 183 | } |
| 184 | |
| 185 | static int udbg_rtascon_getc(void) |
| 186 | { |
| 187 | int c; |
| 188 | |
| 189 | while ((c = udbg_rtascon_getc_poll()) == -1) |
| 190 | ; |
| 191 | |
| 192 | return c; |
| 193 | } |
| 194 | |
| 195 | |
| 196 | void __init udbg_init_rtas_console(void) |
| 197 | { |
| 198 | udbg_putc = udbg_rtascon_putc; |
| 199 | udbg_getc = udbg_rtascon_getc; |
| 200 | udbg_getc_poll = udbg_rtascon_getc_poll; |
| 201 | } |
| 202 | #endif /* CONFIG_UDBG_RTAS_CONSOLE */ |
| 203 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 204 | void rtas_progress(char *s, unsigned short hex) |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 205 | { |
| 206 | struct device_node *root; |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 207 | int width; |
| 208 | const int *p; |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 209 | char *os; |
| 210 | static int display_character, set_indicator; |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 211 | static int display_width, display_lines, form_feed; |
Tobias Klauser | c5a69d5 | 2007-02-17 20:11:19 +0100 | [diff] [blame] | 212 | static const int *row_width; |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 213 | static DEFINE_SPINLOCK(progress_lock); |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 214 | static int current_line; |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 215 | static int pending_newline = 0; /* did last write end with unprinted newline? */ |
| 216 | |
| 217 | if (!rtas.base) |
| 218 | return; |
| 219 | |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 220 | if (display_width == 0) { |
| 221 | display_width = 0x10; |
Stephen Rothwell | 8c8dc32 | 2007-04-24 13:50:55 +1000 | [diff] [blame] | 222 | if ((root = of_find_node_by_path("/rtas"))) { |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 223 | if ((p = of_get_property(root, |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 224 | "ibm,display-line-length", NULL))) |
| 225 | display_width = *p; |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 226 | if ((p = of_get_property(root, |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 227 | "ibm,form-feed", NULL))) |
| 228 | form_feed = *p; |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 229 | if ((p = of_get_property(root, |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 230 | "ibm,display-number-of-lines", NULL))) |
| 231 | display_lines = *p; |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 232 | row_width = of_get_property(root, |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 233 | "ibm,display-truncation-length", NULL); |
Stephen Rothwell | 8c8dc32 | 2007-04-24 13:50:55 +1000 | [diff] [blame] | 234 | of_node_put(root); |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 235 | } |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 236 | display_character = rtas_token("display-character"); |
| 237 | set_indicator = rtas_token("set-indicator"); |
| 238 | } |
| 239 | |
| 240 | if (display_character == RTAS_UNKNOWN_SERVICE) { |
| 241 | /* use hex display if available */ |
| 242 | if (set_indicator != RTAS_UNKNOWN_SERVICE) |
| 243 | rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex); |
| 244 | return; |
| 245 | } |
| 246 | |
| 247 | spin_lock(&progress_lock); |
| 248 | |
| 249 | /* |
| 250 | * Last write ended with newline, but we didn't print it since |
| 251 | * it would just clear the bottom line of output. Print it now |
| 252 | * instead. |
| 253 | * |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 254 | * If no newline is pending and form feed is supported, clear the |
| 255 | * display with a form feed; otherwise, print a CR to start output |
| 256 | * at the beginning of the line. |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 257 | */ |
| 258 | if (pending_newline) { |
| 259 | rtas_call(display_character, 1, 1, NULL, '\r'); |
| 260 | rtas_call(display_character, 1, 1, NULL, '\n'); |
| 261 | pending_newline = 0; |
| 262 | } else { |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 263 | current_line = 0; |
| 264 | if (form_feed) |
| 265 | rtas_call(display_character, 1, 1, NULL, |
| 266 | (char)form_feed); |
| 267 | else |
| 268 | rtas_call(display_character, 1, 1, NULL, '\r'); |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 269 | } |
| 270 | |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 271 | if (row_width) |
| 272 | width = row_width[current_line]; |
| 273 | else |
| 274 | width = display_width; |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 275 | os = s; |
| 276 | while (*os) { |
| 277 | if (*os == '\n' || *os == '\r') { |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 278 | /* If newline is the last character, save it |
| 279 | * until next call to avoid bumping up the |
| 280 | * display output. |
| 281 | */ |
| 282 | if (*os == '\n' && !os[1]) { |
| 283 | pending_newline = 1; |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 284 | current_line++; |
| 285 | if (current_line > display_lines-1) |
| 286 | current_line = display_lines-1; |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 287 | spin_unlock(&progress_lock); |
| 288 | return; |
| 289 | } |
| 290 | |
| 291 | /* RTAS wants CR-LF, not just LF */ |
| 292 | |
| 293 | if (*os == '\n') { |
| 294 | rtas_call(display_character, 1, 1, NULL, '\r'); |
| 295 | rtas_call(display_character, 1, 1, NULL, '\n'); |
| 296 | } else { |
| 297 | /* CR might be used to re-draw a line, so we'll |
| 298 | * leave it alone and not add LF. |
| 299 | */ |
| 300 | rtas_call(display_character, 1, 1, NULL, *os); |
| 301 | } |
| 302 | |
Mike Strosaker | 8f586b2 | 2005-06-23 16:09:41 +1000 | [diff] [blame] | 303 | if (row_width) |
| 304 | width = row_width[current_line]; |
| 305 | else |
| 306 | width = display_width; |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 307 | } else { |
| 308 | width--; |
| 309 | rtas_call(display_character, 1, 1, NULL, *os); |
| 310 | } |
| 311 | |
| 312 | os++; |
| 313 | |
| 314 | /* if we overwrite the screen length */ |
| 315 | if (width <= 0) |
| 316 | while ((*os != 0) && (*os != '\n') && (*os != '\r')) |
| 317 | os++; |
| 318 | } |
| 319 | |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 320 | spin_unlock(&progress_lock); |
| 321 | } |
Paul Mackerras | f4fcbbe | 2005-11-03 14:41:19 +1100 | [diff] [blame] | 322 | EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */ |
Arnd Bergmann | 6566c6f | 2005-06-23 09:43:28 +1000 | [diff] [blame] | 323 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 324 | int rtas_token(const char *service) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | { |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 326 | const int *tokp; |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 327 | if (rtas.dev == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | return RTAS_UNKNOWN_SERVICE; |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 329 | tokp = of_get_property(rtas.dev, service, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | return tokp ? *tokp : RTAS_UNKNOWN_SERVICE; |
| 331 | } |
Michael Ellerman | ab3ab74 | 2006-06-23 18:20:11 +1000 | [diff] [blame] | 332 | EXPORT_SYMBOL(rtas_token); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | |
Nathan Lynch | f2d6d2d | 2006-12-06 18:50:45 -0600 | [diff] [blame] | 334 | int rtas_service_present(const char *service) |
| 335 | { |
| 336 | return rtas_token(service) != RTAS_UNKNOWN_SERVICE; |
| 337 | } |
| 338 | EXPORT_SYMBOL(rtas_service_present); |
| 339 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 340 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | /* |
| 342 | * Return the firmware-specified size of the error log buffer |
| 343 | * for all rtas calls that require an error buffer argument. |
| 344 | * This includes 'check-exception' and 'rtas-last-error'. |
| 345 | */ |
| 346 | int rtas_get_error_log_max(void) |
| 347 | { |
| 348 | static int rtas_error_log_max; |
| 349 | if (rtas_error_log_max) |
| 350 | return rtas_error_log_max; |
| 351 | |
| 352 | rtas_error_log_max = rtas_token ("rtas-error-log-max"); |
| 353 | if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) || |
| 354 | (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) { |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 355 | printk (KERN_WARNING "RTAS: bad log buffer size %d\n", |
| 356 | rtas_error_log_max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | rtas_error_log_max = RTAS_ERROR_LOG_MAX; |
| 358 | } |
| 359 | return rtas_error_log_max; |
| 360 | } |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 361 | EXPORT_SYMBOL(rtas_get_error_log_max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | |
| 363 | |
Michael Ellerman | 1c21a29 | 2008-05-08 14:27:19 +1000 | [diff] [blame] | 364 | static char rtas_err_buf[RTAS_ERROR_LOG_MAX]; |
| 365 | static int rtas_last_error_token; |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 366 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | /** Return a copy of the detailed error text associated with the |
| 368 | * most recent failed call to rtas. Because the error text |
| 369 | * might go stale if there are any other intervening rtas calls, |
| 370 | * this routine must be called atomically with whatever produced |
| 371 | * the error (i.e. with rtas.lock still held from the previous call). |
| 372 | */ |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 373 | static char *__fetch_rtas_last_error(char *altbuf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | { |
| 375 | struct rtas_args err_args, save_args; |
| 376 | u32 bufsz; |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 377 | char *buf = NULL; |
| 378 | |
| 379 | if (rtas_last_error_token == -1) |
| 380 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | |
| 382 | bufsz = rtas_get_error_log_max(); |
| 383 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 384 | err_args.token = rtas_last_error_token; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | err_args.nargs = 2; |
| 386 | err_args.nret = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf); |
| 388 | err_args.args[1] = bufsz; |
| 389 | err_args.args[2] = 0; |
| 390 | |
| 391 | save_args = rtas.args; |
| 392 | rtas.args = err_args; |
| 393 | |
| 394 | enter_rtas(__pa(&rtas.args)); |
| 395 | |
| 396 | err_args = rtas.args; |
| 397 | rtas.args = save_args; |
| 398 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 399 | /* Log the error in the unlikely case that there was one. */ |
| 400 | if (unlikely(err_args.args[2] == 0)) { |
| 401 | if (altbuf) { |
| 402 | buf = altbuf; |
| 403 | } else { |
| 404 | buf = rtas_err_buf; |
| 405 | if (mem_init_done) |
| 406 | buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC); |
| 407 | } |
| 408 | if (buf) |
| 409 | memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX); |
| 410 | } |
| 411 | |
| 412 | return buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | } |
| 414 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 415 | #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL) |
| 416 | |
| 417 | #else /* CONFIG_RTAS_ERROR_LOGGING */ |
| 418 | #define __fetch_rtas_last_error(x) NULL |
| 419 | #define get_errorlog_buffer() NULL |
| 420 | #endif |
| 421 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | int rtas_call(int token, int nargs, int nret, int *outputs, ...) |
| 423 | { |
| 424 | va_list list; |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 425 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | unsigned long s; |
| 427 | struct rtas_args *rtas_args; |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 428 | char *buff_copy = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | int ret; |
| 430 | |
Michael Ellerman | 24da3dd | 2006-06-23 18:20:10 +1000 | [diff] [blame] | 431 | if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | return -1; |
| 433 | |
Benjamin Herrenschmidt | f97bb36 | 2009-06-16 16:42:49 +0000 | [diff] [blame] | 434 | s = lock_rtas(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | rtas_args = &rtas.args; |
| 436 | |
| 437 | rtas_args->token = token; |
| 438 | rtas_args->nargs = nargs; |
| 439 | rtas_args->nret = nret; |
| 440 | rtas_args->rets = (rtas_arg_t *)&(rtas_args->args[nargs]); |
| 441 | va_start(list, outputs); |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 442 | for (i = 0; i < nargs; ++i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | rtas_args->args[i] = va_arg(list, rtas_arg_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | va_end(list); |
| 445 | |
| 446 | for (i = 0; i < nret; ++i) |
| 447 | rtas_args->rets[i] = 0; |
| 448 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | enter_rtas(__pa(rtas_args)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | |
| 451 | /* A -1 return code indicates that the last command couldn't |
| 452 | be completed due to a hardware error. */ |
| 453 | if (rtas_args->rets[0] == -1) |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 454 | buff_copy = __fetch_rtas_last_error(NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | |
| 456 | if (nret > 1 && outputs != NULL) |
| 457 | for (i = 0; i < nret-1; ++i) |
| 458 | outputs[i] = rtas_args->rets[i+1]; |
| 459 | ret = (nret > 0)? rtas_args->rets[0]: 0; |
| 460 | |
Benjamin Herrenschmidt | f97bb36 | 2009-06-16 16:42:49 +0000 | [diff] [blame] | 461 | unlock_rtas(s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | |
| 463 | if (buff_copy) { |
| 464 | log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0); |
| 465 | if (mem_init_done) |
| 466 | kfree(buff_copy); |
| 467 | } |
| 468 | return ret; |
| 469 | } |
Michael Ellerman | ab3ab74 | 2006-06-23 18:20:11 +1000 | [diff] [blame] | 470 | EXPORT_SYMBOL(rtas_call); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 472 | /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status |
| 473 | * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | */ |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 475 | unsigned int rtas_busy_delay_time(int status) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | { |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 477 | int order; |
| 478 | unsigned int ms = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 480 | if (status == RTAS_BUSY) { |
| 481 | ms = 1; |
| 482 | } else if (status >= 9900 && status <= 9905) { |
| 483 | order = status - 9900; |
| 484 | for (ms = 1; order > 0; order--) |
| 485 | ms *= 10; |
| 486 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 488 | return ms; |
| 489 | } |
Michael Ellerman | ab3ab74 | 2006-06-23 18:20:11 +1000 | [diff] [blame] | 490 | EXPORT_SYMBOL(rtas_busy_delay_time); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 492 | /* For an RTAS busy status code, perform the hinted delay. */ |
| 493 | unsigned int rtas_busy_delay(int status) |
| 494 | { |
| 495 | unsigned int ms; |
| 496 | |
| 497 | might_sleep(); |
| 498 | ms = rtas_busy_delay_time(status); |
Anton Blanchard | eca590f | 2011-04-07 01:54:07 +0000 | [diff] [blame] | 499 | if (ms && need_resched()) |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 500 | msleep(ms); |
| 501 | |
| 502 | return ms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | } |
Michael Ellerman | ab3ab74 | 2006-06-23 18:20:11 +1000 | [diff] [blame] | 504 | EXPORT_SYMBOL(rtas_busy_delay); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | |
Michael Ellerman | 1c21a29 | 2008-05-08 14:27:19 +1000 | [diff] [blame] | 506 | static int rtas_error_rc(int rtas_rc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | { |
| 508 | int rc; |
| 509 | |
| 510 | switch (rtas_rc) { |
| 511 | case -1: /* Hardware Error */ |
| 512 | rc = -EIO; |
| 513 | break; |
| 514 | case -3: /* Bad indicator/domain/etc */ |
| 515 | rc = -EINVAL; |
| 516 | break; |
| 517 | case -9000: /* Isolation error */ |
| 518 | rc = -EFAULT; |
| 519 | break; |
| 520 | case -9001: /* Outstanding TCE/PTE */ |
| 521 | rc = -EEXIST; |
| 522 | break; |
| 523 | case -9002: /* No usable slot */ |
| 524 | rc = -ENODEV; |
| 525 | break; |
| 526 | default: |
| 527 | printk(KERN_ERR "%s: unexpected RTAS error %d\n", |
Harvey Harrison | e48b1b4 | 2008-03-29 08:21:07 +1100 | [diff] [blame] | 528 | __func__, rtas_rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | rc = -ERANGE; |
| 530 | break; |
| 531 | } |
| 532 | return rc; |
| 533 | } |
| 534 | |
| 535 | int rtas_get_power_level(int powerdomain, int *level) |
| 536 | { |
| 537 | int token = rtas_token("get-power-level"); |
| 538 | int rc; |
| 539 | |
| 540 | if (token == RTAS_UNKNOWN_SERVICE) |
| 541 | return -ENOENT; |
| 542 | |
| 543 | while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY) |
| 544 | udelay(1); |
| 545 | |
| 546 | if (rc < 0) |
| 547 | return rtas_error_rc(rc); |
| 548 | return rc; |
| 549 | } |
Michael Ellerman | ab3ab74 | 2006-06-23 18:20:11 +1000 | [diff] [blame] | 550 | EXPORT_SYMBOL(rtas_get_power_level); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | |
| 552 | int rtas_set_power_level(int powerdomain, int level, int *setlevel) |
| 553 | { |
| 554 | int token = rtas_token("set-power-level"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | int rc; |
| 556 | |
| 557 | if (token == RTAS_UNKNOWN_SERVICE) |
| 558 | return -ENOENT; |
| 559 | |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 560 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | rc = rtas_call(token, 2, 2, setlevel, powerdomain, level); |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 562 | } while (rtas_busy_delay(rc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | |
| 564 | if (rc < 0) |
| 565 | return rtas_error_rc(rc); |
| 566 | return rc; |
| 567 | } |
Michael Ellerman | ab3ab74 | 2006-06-23 18:20:11 +1000 | [diff] [blame] | 568 | EXPORT_SYMBOL(rtas_set_power_level); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | |
| 570 | int rtas_get_sensor(int sensor, int index, int *state) |
| 571 | { |
| 572 | int token = rtas_token("get-sensor-state"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | int rc; |
| 574 | |
| 575 | if (token == RTAS_UNKNOWN_SERVICE) |
| 576 | return -ENOENT; |
| 577 | |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 578 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | rc = rtas_call(token, 2, 2, state, sensor, index); |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 580 | } while (rtas_busy_delay(rc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | |
| 582 | if (rc < 0) |
| 583 | return rtas_error_rc(rc); |
| 584 | return rc; |
| 585 | } |
Michael Ellerman | ab3ab74 | 2006-06-23 18:20:11 +1000 | [diff] [blame] | 586 | EXPORT_SYMBOL(rtas_get_sensor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | |
Nathan Lynch | edc72ac | 2008-12-11 09:14:25 +0000 | [diff] [blame] | 588 | bool rtas_indicator_present(int token, int *maxindex) |
| 589 | { |
| 590 | int proplen, count, i; |
| 591 | const struct indicator_elem { |
| 592 | u32 token; |
| 593 | u32 maxindex; |
| 594 | } *indicators; |
| 595 | |
| 596 | indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen); |
| 597 | if (!indicators) |
| 598 | return false; |
| 599 | |
| 600 | count = proplen / sizeof(struct indicator_elem); |
| 601 | |
| 602 | for (i = 0; i < count; i++) { |
| 603 | if (indicators[i].token != token) |
| 604 | continue; |
| 605 | if (maxindex) |
| 606 | *maxindex = indicators[i].maxindex; |
| 607 | return true; |
| 608 | } |
| 609 | |
| 610 | return false; |
| 611 | } |
| 612 | EXPORT_SYMBOL(rtas_indicator_present); |
| 613 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | int rtas_set_indicator(int indicator, int index, int new_value) |
| 615 | { |
| 616 | int token = rtas_token("set-indicator"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | int rc; |
| 618 | |
| 619 | if (token == RTAS_UNKNOWN_SERVICE) |
| 620 | return -ENOENT; |
| 621 | |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 622 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 624 | } while (rtas_busy_delay(rc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | |
| 626 | if (rc < 0) |
| 627 | return rtas_error_rc(rc); |
| 628 | return rc; |
| 629 | } |
Michael Ellerman | ab3ab74 | 2006-06-23 18:20:11 +1000 | [diff] [blame] | 630 | EXPORT_SYMBOL(rtas_set_indicator); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | |
Haren Myneni | 81b73dd | 2006-07-27 14:29:00 -0700 | [diff] [blame] | 632 | /* |
| 633 | * Ignoring RTAS extended delay |
| 634 | */ |
| 635 | int rtas_set_indicator_fast(int indicator, int index, int new_value) |
| 636 | { |
| 637 | int rc; |
| 638 | int token = rtas_token("set-indicator"); |
| 639 | |
| 640 | if (token == RTAS_UNKNOWN_SERVICE) |
| 641 | return -ENOENT; |
| 642 | |
| 643 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); |
| 644 | |
| 645 | WARN_ON(rc == -2 || (rc >= 9900 && rc <= 9905)); |
| 646 | |
| 647 | if (rc < 0) |
| 648 | return rtas_error_rc(rc); |
| 649 | |
| 650 | return rc; |
| 651 | } |
| 652 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 653 | void rtas_restart(char *cmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | { |
Paul Mackerras | f4fcbbe | 2005-11-03 14:41:19 +1100 | [diff] [blame] | 655 | if (rtas_flash_term_hook) |
| 656 | rtas_flash_term_hook(SYS_RESTART); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | printk("RTAS system-reboot returned %d\n", |
| 658 | rtas_call(rtas_token("system-reboot"), 0, 1, NULL)); |
| 659 | for (;;); |
| 660 | } |
| 661 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 662 | void rtas_power_off(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | { |
Paul Mackerras | f4fcbbe | 2005-11-03 14:41:19 +1100 | [diff] [blame] | 664 | if (rtas_flash_term_hook) |
| 665 | rtas_flash_term_hook(SYS_POWER_OFF); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | /* allow power on only with power button press */ |
| 667 | printk("RTAS power-off returned %d\n", |
| 668 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); |
| 669 | for (;;); |
| 670 | } |
| 671 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 672 | void rtas_halt(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | { |
Paul Mackerras | f4fcbbe | 2005-11-03 14:41:19 +1100 | [diff] [blame] | 674 | if (rtas_flash_term_hook) |
| 675 | rtas_flash_term_hook(SYS_HALT); |
| 676 | /* allow power on only with power button press */ |
| 677 | printk("RTAS power-off returned %d\n", |
| 678 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); |
| 679 | for (;;); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | } |
| 681 | |
| 682 | /* Must be in the RMO region, so we place it here */ |
| 683 | static char rtas_os_term_buf[2048]; |
| 684 | |
Paul Mackerras | 8f51506 | 2007-12-03 09:30:04 +1100 | [diff] [blame] | 685 | void rtas_os_term(char *str) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | { |
| 687 | int status; |
| 688 | |
Anton Blanchard | e9bbc8c | 2010-02-18 12:11:51 +0000 | [diff] [blame] | 689 | /* |
| 690 | * Firmware with the ibm,extended-os-term property is guaranteed |
| 691 | * to always return from an ibm,os-term call. Earlier versions without |
| 692 | * this property may terminate the partition which we want to avoid |
| 693 | * since it interferes with panic_timeout. |
| 694 | */ |
| 695 | if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term") || |
| 696 | RTAS_UNKNOWN_SERVICE == rtas_token("ibm,extended-os-term")) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | return; |
| 698 | |
Paul Mackerras | 8f51506 | 2007-12-03 09:30:04 +1100 | [diff] [blame] | 699 | snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str); |
| 700 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | do { |
| 702 | status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL, |
| 703 | __pa(rtas_os_term_buf)); |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 704 | } while (rtas_busy_delay(status)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 706 | if (status != 0) |
Anton Blanchard | e9bbc8c | 2010-02-18 12:11:51 +0000 | [diff] [blame] | 707 | printk(KERN_EMERG "ibm,os-term call failed %d\n", status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | } |
| 709 | |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 710 | static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE; |
| 711 | #ifdef CONFIG_PPC_PSERIES |
Brian King | 8fe93f8 | 2010-07-07 12:31:01 +0000 | [diff] [blame] | 712 | static int __rtas_suspend_last_cpu(struct rtas_suspend_me_data *data, int wake_when_done) |
| 713 | { |
| 714 | u16 slb_size = mmu_slb_size; |
| 715 | int rc = H_MULTI_THREADS_ACTIVE; |
| 716 | int cpu; |
| 717 | |
| 718 | slb_set_size(SLB_MIN_SIZE); |
Jesse Larrew | 3b7a27d | 2010-12-01 12:31:26 +0000 | [diff] [blame] | 719 | stop_topology_update(); |
Brian King | 8fe93f8 | 2010-07-07 12:31:01 +0000 | [diff] [blame] | 720 | printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", smp_processor_id()); |
| 721 | |
| 722 | while (rc == H_MULTI_THREADS_ACTIVE && !atomic_read(&data->done) && |
| 723 | !atomic_read(&data->error)) |
| 724 | rc = rtas_call(data->token, 0, 1, NULL); |
| 725 | |
| 726 | if (rc || atomic_read(&data->error)) { |
| 727 | printk(KERN_DEBUG "ibm,suspend-me returned %d\n", rc); |
| 728 | slb_set_size(slb_size); |
| 729 | } |
| 730 | |
| 731 | if (atomic_read(&data->error)) |
| 732 | rc = atomic_read(&data->error); |
| 733 | |
| 734 | atomic_set(&data->error, rc); |
Jesse Larrew | 3b7a27d | 2010-12-01 12:31:26 +0000 | [diff] [blame] | 735 | start_topology_update(); |
Brian King | 9ee820f | 2011-05-04 16:01:20 +1000 | [diff] [blame] | 736 | pSeries_coalesce_init(); |
Brian King | 8fe93f8 | 2010-07-07 12:31:01 +0000 | [diff] [blame] | 737 | |
| 738 | if (wake_when_done) { |
| 739 | atomic_set(&data->done, 1); |
| 740 | |
| 741 | for_each_online_cpu(cpu) |
| 742 | plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); |
| 743 | } |
| 744 | |
| 745 | if (atomic_dec_return(&data->working) == 0) |
| 746 | complete(data->complete); |
| 747 | |
| 748 | return rc; |
| 749 | } |
| 750 | |
| 751 | int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data) |
| 752 | { |
| 753 | atomic_inc(&data->working); |
| 754 | return __rtas_suspend_last_cpu(data, 0); |
| 755 | } |
| 756 | |
| 757 | static int __rtas_suspend_cpu(struct rtas_suspend_me_data *data, int wake_when_done) |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 758 | { |
Brian King | f52862f | 2009-02-17 06:49:50 +0000 | [diff] [blame] | 759 | long rc = H_SUCCESS; |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 760 | unsigned long msr_save; |
| 761 | int cpu; |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 762 | |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 763 | atomic_inc(&data->working); |
| 764 | |
| 765 | /* really need to ensure MSR.EE is off for H_JOIN */ |
| 766 | msr_save = mfmsr(); |
| 767 | mtmsr(msr_save & ~(MSR_EE)); |
| 768 | |
Brian King | 8fe93f8 | 2010-07-07 12:31:01 +0000 | [diff] [blame] | 769 | while (rc == H_SUCCESS && !atomic_read(&data->done) && !atomic_read(&data->error)) |
Brian King | f52862f | 2009-02-17 06:49:50 +0000 | [diff] [blame] | 770 | rc = plpar_hcall_norets(H_JOIN); |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 771 | |
| 772 | mtmsr(msr_save); |
| 773 | |
| 774 | if (rc == H_SUCCESS) { |
| 775 | /* This cpu was prodded and the suspend is complete. */ |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 776 | goto out; |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 777 | } else if (rc == H_CONTINUE) { |
| 778 | /* All other cpus are in H_JOIN, this cpu does |
| 779 | * the suspend. |
| 780 | */ |
Brian King | 8fe93f8 | 2010-07-07 12:31:01 +0000 | [diff] [blame] | 781 | return __rtas_suspend_last_cpu(data, wake_when_done); |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 782 | } else { |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 783 | printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n", |
| 784 | smp_processor_id(), rc); |
Brian King | 8fe93f8 | 2010-07-07 12:31:01 +0000 | [diff] [blame] | 785 | atomic_set(&data->error, rc); |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 786 | } |
Brian King | f52862f | 2009-02-17 06:49:50 +0000 | [diff] [blame] | 787 | |
Brian King | 8fe93f8 | 2010-07-07 12:31:01 +0000 | [diff] [blame] | 788 | if (wake_when_done) { |
| 789 | atomic_set(&data->done, 1); |
Brian King | f52862f | 2009-02-17 06:49:50 +0000 | [diff] [blame] | 790 | |
Brian King | 8fe93f8 | 2010-07-07 12:31:01 +0000 | [diff] [blame] | 791 | /* This cpu did the suspend or got an error; in either case, |
| 792 | * we need to prod all other other cpus out of join state. |
| 793 | * Extra prods are harmless. |
| 794 | */ |
| 795 | for_each_online_cpu(cpu) |
| 796 | plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); |
| 797 | } |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 798 | out: |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 799 | if (atomic_dec_return(&data->working) == 0) |
| 800 | complete(data->complete); |
Brian King | 8fe93f8 | 2010-07-07 12:31:01 +0000 | [diff] [blame] | 801 | return rc; |
| 802 | } |
| 803 | |
| 804 | int rtas_suspend_cpu(struct rtas_suspend_me_data *data) |
| 805 | { |
| 806 | return __rtas_suspend_cpu(data, 0); |
| 807 | } |
| 808 | |
| 809 | static void rtas_percpu_suspend_me(void *info) |
| 810 | { |
| 811 | __rtas_suspend_cpu((struct rtas_suspend_me_data *)info, 1); |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 812 | } |
| 813 | |
Nathan Fontenot | d8862be | 2010-09-10 09:41:35 +0000 | [diff] [blame] | 814 | int rtas_ibm_suspend_me(struct rtas_args *args) |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 815 | { |
Dave C Boutcher | 368a6ba | 2006-06-12 19:49:20 -0500 | [diff] [blame] | 816 | long state; |
| 817 | long rc; |
Anton Blanchard | b9377ff | 2006-07-19 08:01:28 +1000 | [diff] [blame] | 818 | unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 819 | struct rtas_suspend_me_data data; |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 820 | DECLARE_COMPLETION_ONSTACK(done); |
| 821 | |
| 822 | if (!rtas_service_present("ibm,suspend-me")) |
| 823 | return -ENOSYS; |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 824 | |
Dave C Boutcher | 368a6ba | 2006-06-12 19:49:20 -0500 | [diff] [blame] | 825 | /* Make sure the state is valid */ |
Anton Blanchard | b9377ff | 2006-07-19 08:01:28 +1000 | [diff] [blame] | 826 | rc = plpar_hcall(H_VASI_STATE, retbuf, |
| 827 | ((u64)args->args[0] << 32) | args->args[1]); |
| 828 | |
| 829 | state = retbuf[0]; |
Dave C Boutcher | 368a6ba | 2006-06-12 19:49:20 -0500 | [diff] [blame] | 830 | |
| 831 | if (rc) { |
| 832 | printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc); |
| 833 | return rc; |
| 834 | } else if (state == H_VASI_ENABLED) { |
| 835 | args->args[args->nargs] = RTAS_NOT_SUSPENDABLE; |
| 836 | return 0; |
| 837 | } else if (state != H_VASI_SUSPENDING) { |
| 838 | printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n", |
| 839 | state); |
| 840 | args->args[args->nargs] = -1; |
| 841 | return 0; |
| 842 | } |
| 843 | |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 844 | atomic_set(&data.working, 0); |
Brian King | f52862f | 2009-02-17 06:49:50 +0000 | [diff] [blame] | 845 | atomic_set(&data.done, 0); |
Brian King | 8fe93f8 | 2010-07-07 12:31:01 +0000 | [diff] [blame] | 846 | atomic_set(&data.error, 0); |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 847 | data.token = rtas_token("ibm,suspend-me"); |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 848 | data.complete = &done; |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 849 | |
| 850 | /* Call function on all CPUs. One of us will make the |
| 851 | * rtas call |
| 852 | */ |
Jens Axboe | 15c8b6c | 2008-05-09 09:39:44 +0200 | [diff] [blame] | 853 | if (on_each_cpu(rtas_percpu_suspend_me, &data, 0)) |
Brian King | 8fe93f8 | 2010-07-07 12:31:01 +0000 | [diff] [blame] | 854 | atomic_set(&data.error, -EINVAL); |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 855 | |
Nathan Lynch | 8f5c757 | 2007-11-14 03:15:13 +1100 | [diff] [blame] | 856 | wait_for_completion(&done); |
| 857 | |
Brian King | 8fe93f8 | 2010-07-07 12:31:01 +0000 | [diff] [blame] | 858 | if (atomic_read(&data.error) != 0) |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 859 | printk(KERN_ERR "Error doing global join\n"); |
| 860 | |
Brian King | 8fe93f8 | 2010-07-07 12:31:01 +0000 | [diff] [blame] | 861 | return atomic_read(&data.error); |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 862 | } |
| 863 | #else /* CONFIG_PPC_PSERIES */ |
Nathan Fontenot | d8862be | 2010-09-10 09:41:35 +0000 | [diff] [blame] | 864 | int rtas_ibm_suspend_me(struct rtas_args *args) |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 865 | { |
| 866 | return -ENOSYS; |
| 867 | } |
| 868 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | |
| 870 | asmlinkage int ppc_rtas(struct rtas_args __user *uargs) |
| 871 | { |
| 872 | struct rtas_args args; |
| 873 | unsigned long flags; |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 874 | char *buff_copy, *errbuf = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | int nargs; |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 876 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | |
| 878 | if (!capable(CAP_SYS_ADMIN)) |
| 879 | return -EPERM; |
| 880 | |
| 881 | if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0) |
| 882 | return -EFAULT; |
| 883 | |
| 884 | nargs = args.nargs; |
| 885 | if (nargs > ARRAY_SIZE(args.args) |
| 886 | || args.nret > ARRAY_SIZE(args.args) |
| 887 | || nargs + args.nret > ARRAY_SIZE(args.args)) |
| 888 | return -EINVAL; |
| 889 | |
| 890 | /* Copy in args. */ |
| 891 | if (copy_from_user(args.args, uargs->args, |
| 892 | nargs * sizeof(rtas_arg_t)) != 0) |
| 893 | return -EFAULT; |
| 894 | |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 895 | if (args.token == RTAS_UNKNOWN_SERVICE) |
| 896 | return -EINVAL; |
| 897 | |
Nathan Fontenot | b79998f | 2008-07-31 02:23:27 +1000 | [diff] [blame] | 898 | args.rets = &args.args[nargs]; |
| 899 | memset(args.rets, 0, args.nret * sizeof(rtas_arg_t)); |
| 900 | |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 901 | /* Need to handle ibm,suspend_me call specially */ |
| 902 | if (args.token == ibm_suspend_me_token) { |
| 903 | rc = rtas_ibm_suspend_me(&args); |
| 904 | if (rc) |
| 905 | return rc; |
| 906 | goto copy_return; |
| 907 | } |
| 908 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 909 | buff_copy = get_errorlog_buffer(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | |
Benjamin Herrenschmidt | f97bb36 | 2009-06-16 16:42:49 +0000 | [diff] [blame] | 911 | flags = lock_rtas(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | |
| 913 | rtas.args = args; |
| 914 | enter_rtas(__pa(&rtas.args)); |
| 915 | args = rtas.args; |
| 916 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | /* A -1 return code indicates that the last command couldn't |
| 918 | be completed due to a hardware error. */ |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 919 | if (args.rets[0] == -1) |
| 920 | errbuf = __fetch_rtas_last_error(buff_copy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | |
Benjamin Herrenschmidt | f97bb36 | 2009-06-16 16:42:49 +0000 | [diff] [blame] | 922 | unlock_rtas(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | |
| 924 | if (buff_copy) { |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 925 | if (errbuf) |
| 926 | log_error(errbuf, ERR_TYPE_RTAS_LOG, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | kfree(buff_copy); |
| 928 | } |
| 929 | |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 930 | copy_return: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | /* Copy out args. */ |
| 932 | if (copy_to_user(uargs->args + nargs, |
| 933 | args.args + nargs, |
| 934 | args.nret * sizeof(rtas_arg_t)) != 0) |
| 935 | return -EFAULT; |
| 936 | |
| 937 | return 0; |
| 938 | } |
| 939 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | /* |
Adrian Bunk | 943ffb5 | 2006-01-10 00:10:13 +0100 | [diff] [blame] | 941 | * Call early during boot, before mem init or bootmem, to retrieve the RTAS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | * informations from the device-tree and allocate the RMO buffer for userland |
| 943 | * accesses. |
| 944 | */ |
| 945 | void __init rtas_initialize(void) |
| 946 | { |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 947 | unsigned long rtas_region = RTAS_INSTANTIATE_MAX; |
| 948 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | /* Get RTAS dev node and fill up our "rtas" structure with infos |
| 950 | * about it. |
| 951 | */ |
| 952 | rtas.dev = of_find_node_by_name(NULL, "rtas"); |
| 953 | if (rtas.dev) { |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 954 | const u32 *basep, *entryp, *sizep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 956 | basep = of_get_property(rtas.dev, "linux,rtas-base", NULL); |
| 957 | sizep = of_get_property(rtas.dev, "rtas-size", NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | if (basep != NULL && sizep != NULL) { |
| 959 | rtas.base = *basep; |
| 960 | rtas.size = *sizep; |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 961 | entryp = of_get_property(rtas.dev, |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 962 | "linux,rtas-entry", NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | if (entryp == NULL) /* Ugh */ |
| 964 | rtas.entry = rtas.base; |
| 965 | else |
| 966 | rtas.entry = *entryp; |
| 967 | } else |
| 968 | rtas.dev = NULL; |
| 969 | } |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 970 | if (!rtas.dev) |
| 971 | return; |
| 972 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | /* If RTAS was found, allocate the RMO buffer for it and look for |
| 974 | * the stop-self token if any |
| 975 | */ |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 976 | #ifdef CONFIG_PPC64 |
Benjamin Herrenschmidt | e822250 | 2006-03-28 23:15:54 +1100 | [diff] [blame] | 977 | if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR)) { |
Benjamin Herrenschmidt | cd3db0c | 2010-07-06 15:39:02 -0700 | [diff] [blame] | 978 | rtas_region = min(ppc64_rma_size, RTAS_INSTANTIATE_MAX); |
Dave C Boutcher | 91dc182 | 2006-01-13 18:39:24 -0600 | [diff] [blame] | 979 | ibm_suspend_me_token = rtas_token("ibm,suspend-me"); |
| 980 | } |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 981 | #endif |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 982 | rtas_rmo_buf = memblock_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | |
Paul Mackerras | 033ef33 | 2005-10-26 17:05:24 +1000 | [diff] [blame] | 984 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
| 985 | rtas_last_error_token = rtas_token("rtas-last-error"); |
| 986 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | } |
Michael Ellerman | 458148c | 2006-06-23 18:20:13 +1000 | [diff] [blame] | 988 | |
| 989 | int __init early_init_dt_scan_rtas(unsigned long node, |
| 990 | const char *uname, int depth, void *data) |
| 991 | { |
| 992 | u32 *basep, *entryp, *sizep; |
| 993 | |
| 994 | if (depth != 1 || strcmp(uname, "rtas") != 0) |
| 995 | return 0; |
| 996 | |
| 997 | basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL); |
| 998 | entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL); |
| 999 | sizep = of_get_flat_dt_prop(node, "rtas-size", NULL); |
| 1000 | |
| 1001 | if (basep && entryp && sizep) { |
| 1002 | rtas.base = *basep; |
| 1003 | rtas.entry = *entryp; |
| 1004 | rtas.size = *sizep; |
| 1005 | } |
| 1006 | |
Michael Ellerman | cc46bb9 | 2006-06-23 18:20:16 +1000 | [diff] [blame] | 1007 | #ifdef CONFIG_UDBG_RTAS_CONSOLE |
| 1008 | basep = of_get_flat_dt_prop(node, "put-term-char", NULL); |
| 1009 | if (basep) |
| 1010 | rtas_putchar_token = *basep; |
| 1011 | |
| 1012 | basep = of_get_flat_dt_prop(node, "get-term-char", NULL); |
| 1013 | if (basep) |
| 1014 | rtas_getchar_token = *basep; |
Michael Neuling | 9a2ded5 | 2006-08-16 23:12:14 -0500 | [diff] [blame] | 1015 | |
| 1016 | if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE && |
| 1017 | rtas_getchar_token != RTAS_UNKNOWN_SERVICE) |
| 1018 | udbg_init_rtas_console(); |
| 1019 | |
Michael Ellerman | cc46bb9 | 2006-06-23 18:20:16 +1000 | [diff] [blame] | 1020 | #endif |
| 1021 | |
Michael Ellerman | 458148c | 2006-06-23 18:20:13 +1000 | [diff] [blame] | 1022 | /* break now */ |
| 1023 | return 1; |
| 1024 | } |
Benjamin Herrenschmidt | c4007a2 | 2009-06-16 16:42:50 +0000 | [diff] [blame] | 1025 | |
Thomas Gleixner | 445c895 | 2009-12-02 19:49:50 +0100 | [diff] [blame] | 1026 | static arch_spinlock_t timebase_lock; |
Benjamin Herrenschmidt | c4007a2 | 2009-06-16 16:42:50 +0000 | [diff] [blame] | 1027 | static u64 timebase = 0; |
| 1028 | |
| 1029 | void __cpuinit rtas_give_timebase(void) |
| 1030 | { |
| 1031 | unsigned long flags; |
| 1032 | |
| 1033 | local_irq_save(flags); |
| 1034 | hard_irq_disable(); |
Thomas Gleixner | 0199c4e | 2009-12-02 20:01:25 +0100 | [diff] [blame] | 1035 | arch_spin_lock(&timebase_lock); |
Benjamin Herrenschmidt | c4007a2 | 2009-06-16 16:42:50 +0000 | [diff] [blame] | 1036 | rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL); |
| 1037 | timebase = get_tb(); |
Thomas Gleixner | 0199c4e | 2009-12-02 20:01:25 +0100 | [diff] [blame] | 1038 | arch_spin_unlock(&timebase_lock); |
Benjamin Herrenschmidt | c4007a2 | 2009-06-16 16:42:50 +0000 | [diff] [blame] | 1039 | |
| 1040 | while (timebase) |
| 1041 | barrier(); |
| 1042 | rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL); |
| 1043 | local_irq_restore(flags); |
| 1044 | } |
| 1045 | |
| 1046 | void __cpuinit rtas_take_timebase(void) |
| 1047 | { |
| 1048 | while (!timebase) |
| 1049 | barrier(); |
Thomas Gleixner | 0199c4e | 2009-12-02 20:01:25 +0100 | [diff] [blame] | 1050 | arch_spin_lock(&timebase_lock); |
Benjamin Herrenschmidt | c4007a2 | 2009-06-16 16:42:50 +0000 | [diff] [blame] | 1051 | set_tb(timebase >> 32, timebase & 0xffffffff); |
| 1052 | timebase = 0; |
Thomas Gleixner | 0199c4e | 2009-12-02 20:01:25 +0100 | [diff] [blame] | 1053 | arch_spin_unlock(&timebase_lock); |
Benjamin Herrenschmidt | c4007a2 | 2009-06-16 16:42:50 +0000 | [diff] [blame] | 1054 | } |