Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 1 | /* |
| 2 | * File: arch/blackfin/mach-common/interrupt.S |
| 3 | * Based on: |
| 4 | * Author: D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca> |
| 5 | * Kenneth Albanowski <kjahds@kjahds.com> |
| 6 | * |
| 7 | * Created: ? |
| 8 | * Description: Interrupt Entries |
| 9 | * |
| 10 | * Modified: |
| 11 | * Copyright 2004-2006 Analog Devices Inc. |
| 12 | * |
| 13 | * Bugs: Enter bugs at http://blackfin.uclinux.org/ |
| 14 | * |
| 15 | * This program is free software; you can redistribute it and/or modify |
| 16 | * it under the terms of the GNU General Public License as published by |
| 17 | * the Free Software Foundation; either version 2 of the License, or |
| 18 | * (at your option) any later version. |
| 19 | * |
| 20 | * This program is distributed in the hope that it will be useful, |
| 21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 23 | * GNU General Public License for more details. |
| 24 | * |
| 25 | * You should have received a copy of the GNU General Public License |
| 26 | * along with this program; if not, see the file COPYING, or write |
| 27 | * to the Free Software Foundation, Inc., |
| 28 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 29 | */ |
| 30 | |
| 31 | #include <asm/blackfin.h> |
Bryan Wu | 639f657 | 2008-08-27 10:51:02 +0800 | [diff] [blame] | 32 | #include <mach/irq.h> |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 33 | #include <linux/linkage.h> |
| 34 | #include <asm/entry.h> |
| 35 | #include <asm/asm-offsets.h> |
Robin Getz | 669b792 | 2007-06-21 16:34:08 +0800 | [diff] [blame] | 36 | #include <asm/trace.h> |
Robin Getz | 13fe24f | 2008-01-27 15:38:56 +0800 | [diff] [blame] | 37 | #include <asm/traps.h> |
| 38 | #include <asm/thread_info.h> |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 39 | |
Bryan Wu | 639f657 | 2008-08-27 10:51:02 +0800 | [diff] [blame] | 40 | #include <asm/context.S> |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 41 | |
Robin Getz | 13fe24f | 2008-01-27 15:38:56 +0800 | [diff] [blame] | 42 | .extern _ret_from_exception |
| 43 | |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 44 | #ifdef CONFIG_I_ENTRY_L1 |
| 45 | .section .l1.text |
| 46 | #else |
| 47 | .text |
| 48 | #endif |
| 49 | |
| 50 | .align 4 /* just in case */ |
| 51 | |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 52 | /* Common interrupt entry code. First we do CLI, then push |
| 53 | * RETI, to keep interrupts disabled, but to allow this state to be changed |
| 54 | * by local_bh_enable. |
| 55 | * R0 contains the interrupt number, while R1 may contain the value of IPEND, |
| 56 | * or garbage if IPEND won't be needed by the ISR. */ |
| 57 | __common_int_entry: |
| 58 | [--sp] = fp; |
| 59 | [--sp] = usp; |
| 60 | |
| 61 | [--sp] = i0; |
| 62 | [--sp] = i1; |
| 63 | [--sp] = i2; |
| 64 | [--sp] = i3; |
| 65 | |
| 66 | [--sp] = m0; |
| 67 | [--sp] = m1; |
| 68 | [--sp] = m2; |
| 69 | [--sp] = m3; |
| 70 | |
| 71 | [--sp] = l0; |
| 72 | [--sp] = l1; |
| 73 | [--sp] = l2; |
| 74 | [--sp] = l3; |
| 75 | |
| 76 | [--sp] = b0; |
| 77 | [--sp] = b1; |
| 78 | [--sp] = b2; |
| 79 | [--sp] = b3; |
| 80 | [--sp] = a0.x; |
| 81 | [--sp] = a0.w; |
| 82 | [--sp] = a1.x; |
| 83 | [--sp] = a1.w; |
| 84 | |
| 85 | [--sp] = LC0; |
| 86 | [--sp] = LC1; |
| 87 | [--sp] = LT0; |
| 88 | [--sp] = LT1; |
| 89 | [--sp] = LB0; |
| 90 | [--sp] = LB1; |
| 91 | |
| 92 | [--sp] = ASTAT; |
| 93 | |
| 94 | [--sp] = r0; /* Skip reserved */ |
| 95 | [--sp] = RETS; |
| 96 | r2 = RETI; |
| 97 | [--sp] = r2; |
| 98 | [--sp] = RETX; |
| 99 | [--sp] = RETN; |
| 100 | [--sp] = RETE; |
| 101 | [--sp] = SEQSTAT; |
| 102 | [--sp] = r1; /* IPEND - R1 may or may not be set up before jumping here. */ |
| 103 | |
| 104 | /* Switch to other method of keeping interrupts disabled. */ |
| 105 | #ifdef CONFIG_DEBUG_HWERR |
| 106 | r1 = 0x3f; |
| 107 | sti r1; |
| 108 | #else |
| 109 | cli r1; |
| 110 | #endif |
| 111 | [--sp] = RETI; /* orig_pc */ |
| 112 | /* Clear all L registers. */ |
| 113 | r1 = 0 (x); |
| 114 | l0 = r1; |
| 115 | l1 = r1; |
| 116 | l2 = r1; |
| 117 | l3 = r1; |
| 118 | #ifdef CONFIG_FRAME_POINTER |
| 119 | fp = 0; |
| 120 | #endif |
| 121 | |
Robin Getz | dedfd5d | 2009-08-26 15:54:10 +0000 | [diff] [blame] | 122 | ANOMALY_283_315_WORKAROUND(p5, r7) |
| 123 | |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 124 | r1 = sp; |
| 125 | SP += -12; |
Yi Li | 6a01f23 | 2009-01-07 23:14:39 +0800 | [diff] [blame] | 126 | #ifdef CONFIG_IPIPE |
| 127 | call ___ipipe_grab_irq |
| 128 | SP += 12; |
| 129 | cc = r0 == 0; |
| 130 | if cc jump .Lcommon_restore_context; |
| 131 | #else /* CONFIG_IPIPE */ |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 132 | call _do_irq; |
| 133 | SP += 12; |
Yi Li | 6a01f23 | 2009-01-07 23:14:39 +0800 | [diff] [blame] | 134 | #endif /* CONFIG_IPIPE */ |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 135 | call _return_from_int; |
| 136 | .Lcommon_restore_context: |
| 137 | RESTORE_CONTEXT |
| 138 | rti; |
| 139 | |
| 140 | /* interrupt routine for ivhw - 5 */ |
| 141 | ENTRY(_evt_ivhw) |
Robin Getz | b9a3899 | 2009-05-18 18:33:26 +0000 | [diff] [blame] | 142 | /* In case a single action kicks off multiple memory transactions, (like |
| 143 | * a cache line fetch, - this can cause multiple hardware errors, let's |
| 144 | * catch them all. First - make sure all the actions are complete, and |
| 145 | * the core sees the hardware errors. |
| 146 | */ |
| 147 | SSYNC; |
| 148 | SSYNC; |
| 149 | |
Robin Getz | 13fe24f | 2008-01-27 15:38:56 +0800 | [diff] [blame] | 150 | SAVE_ALL_SYS |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 151 | #ifdef CONFIG_FRAME_POINTER |
| 152 | fp = 0; |
| 153 | #endif |
Robin Getz | 13fe24f | 2008-01-27 15:38:56 +0800 | [diff] [blame] | 154 | |
Robin Getz | dedfd5d | 2009-08-26 15:54:10 +0000 | [diff] [blame] | 155 | ANOMALY_283_315_WORKAROUND(p5, r7) |
Robin Getz | 669b792 | 2007-06-21 16:34:08 +0800 | [diff] [blame] | 156 | |
Robin Getz | b9a3899 | 2009-05-18 18:33:26 +0000 | [diff] [blame] | 157 | /* Handle all stacked hardware errors |
| 158 | * To make sure we don't hang forever, only do it 10 times |
| 159 | */ |
| 160 | R0 = 0; |
| 161 | R2 = 10; |
| 162 | 1: |
| 163 | P0.L = LO(ILAT); |
| 164 | P0.H = HI(ILAT); |
| 165 | R1 = [P0]; |
| 166 | CC = BITTST(R1, EVT_IVHW_P); |
| 167 | IF ! CC JUMP 2f; |
| 168 | /* OK a hardware error is pending - clear it */ |
| 169 | R1 = EVT_IVHW_P; |
| 170 | [P0] = R1; |
| 171 | R0 += 1; |
| 172 | CC = R1 == R2; |
| 173 | if CC JUMP 2f; |
| 174 | JUMP 1b; |
| 175 | 2: |
Graf Yang | f994607 | 2009-01-07 23:14:39 +0800 | [diff] [blame] | 176 | # We are going to dump something out, so make sure we print IPEND properly |
| 177 | p2.l = lo(IPEND); |
| 178 | p2.h = hi(IPEND); |
| 179 | r0 = [p2]; |
| 180 | [sp + PT_IPEND] = r0; |
| 181 | |
Robin Getz | 13fe24f | 2008-01-27 15:38:56 +0800 | [diff] [blame] | 182 | /* set the EXCAUSE to HWERR for trap_c */ |
| 183 | r0 = [sp + PT_SEQSTAT]; |
| 184 | R1.L = LO(VEC_HWERR); |
| 185 | R1.H = HI(VEC_HWERR); |
| 186 | R0 = R0 | R1; |
| 187 | [sp + PT_SEQSTAT] = R0; |
| 188 | |
| 189 | r0 = sp; /* stack frame pt_regs pointer argument ==> r0 */ |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 190 | SP += -12; |
Robin Getz | 13fe24f | 2008-01-27 15:38:56 +0800 | [diff] [blame] | 191 | call _trap_c; |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 192 | SP += 12; |
Robin Getz | 13fe24f | 2008-01-27 15:38:56 +0800 | [diff] [blame] | 193 | |
Robin Getz | 1d5ff7e | 2008-10-09 17:06:32 +0800 | [diff] [blame] | 194 | #ifdef EBIU_ERRMST |
| 195 | /* make sure EBIU_ERRMST is clear */ |
| 196 | p0.l = LO(EBIU_ERRMST); |
| 197 | p0.h = HI(EBIU_ERRMST); |
| 198 | r0.l = (CORE_ERROR | CORE_MERROR); |
| 199 | w[p0] = r0.l; |
| 200 | #endif |
| 201 | |
Robin Getz | 13fe24f | 2008-01-27 15:38:56 +0800 | [diff] [blame] | 202 | call _ret_from_exception; |
Robin Getz | 1d5ff7e | 2008-10-09 17:06:32 +0800 | [diff] [blame] | 203 | |
Robin Getz | 13fe24f | 2008-01-27 15:38:56 +0800 | [diff] [blame] | 204 | .Lcommon_restore_all_sys: |
| 205 | RESTORE_ALL_SYS |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 206 | rti; |
Robin Getz | 13fe24f | 2008-01-27 15:38:56 +0800 | [diff] [blame] | 207 | ENDPROC(_evt_ivhw) |
| 208 | |
Mike Frysinger | f0b5d12 | 2007-08-05 17:03:59 +0800 | [diff] [blame] | 209 | /* Interrupt routine for evt2 (NMI). |
| 210 | * We don't actually use this, so just return. |
| 211 | * For inner circle type details, please see: |
Robin Getz | e48df47 | 2009-02-04 16:49:45 +0800 | [diff] [blame] | 212 | * http://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:nmi |
Mike Frysinger | f0b5d12 | 2007-08-05 17:03:59 +0800 | [diff] [blame] | 213 | */ |
| 214 | ENTRY(_evt_nmi) |
| 215 | .weak _evt_nmi |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 216 | rtn; |
Mike Frysinger | f0b5d12 | 2007-08-05 17:03:59 +0800 | [diff] [blame] | 217 | ENDPROC(_evt_nmi) |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 218 | |
| 219 | /* interrupt routine for core timer - 6 */ |
| 220 | ENTRY(_evt_timer) |
| 221 | TIMER_INTERRUPT_ENTRY(EVT_IVTMR_P) |
| 222 | |
| 223 | /* interrupt routine for evt7 - 7 */ |
| 224 | ENTRY(_evt_evt7) |
| 225 | INTERRUPT_ENTRY(EVT_IVG7_P) |
| 226 | ENTRY(_evt_evt8) |
| 227 | INTERRUPT_ENTRY(EVT_IVG8_P) |
| 228 | ENTRY(_evt_evt9) |
| 229 | INTERRUPT_ENTRY(EVT_IVG9_P) |
| 230 | ENTRY(_evt_evt10) |
| 231 | INTERRUPT_ENTRY(EVT_IVG10_P) |
| 232 | ENTRY(_evt_evt11) |
| 233 | INTERRUPT_ENTRY(EVT_IVG11_P) |
| 234 | ENTRY(_evt_evt12) |
| 235 | INTERRUPT_ENTRY(EVT_IVG12_P) |
| 236 | ENTRY(_evt_evt13) |
| 237 | INTERRUPT_ENTRY(EVT_IVG13_P) |
| 238 | |
| 239 | |
| 240 | /* interrupt routine for system_call - 15 */ |
| 241 | ENTRY(_evt_system_call) |
| 242 | SAVE_CONTEXT_SYSCALL |
| 243 | #ifdef CONFIG_FRAME_POINTER |
| 244 | fp = 0; |
| 245 | #endif |
| 246 | call _system_call; |
| 247 | jump .Lcommon_restore_context; |
Mike Frysinger | 51be24c | 2007-06-11 15:31:30 +0800 | [diff] [blame] | 248 | ENDPROC(_evt_system_call) |
Yi Li | 6a01f23 | 2009-01-07 23:14:39 +0800 | [diff] [blame] | 249 | |
| 250 | #ifdef CONFIG_IPIPE |
Philippe Gerum | 7a7967d | 2009-06-22 18:25:52 +0200 | [diff] [blame] | 251 | /* |
| 252 | * __ipipe_call_irqtail: lowers the current priority level to EVT15 |
| 253 | * before running a user-defined routine, then raises the priority |
| 254 | * level to EVT14 to prepare the caller for a normal interrupt |
| 255 | * return through RTI. |
| 256 | * |
| 257 | * We currently use this facility in two occasions: |
| 258 | * |
| 259 | * - to branch to __ipipe_irq_tail_hook as requested by a high |
| 260 | * priority domain after the pipeline delivered an interrupt, |
| 261 | * e.g. such as Xenomai, in order to start its rescheduling |
| 262 | * procedure, since we may not switch tasks when IRQ levels are |
| 263 | * nested on the Blackfin, so we have to fake an interrupt return |
| 264 | * so that we may reschedule immediately. |
| 265 | * |
| 266 | * - to branch to sync_root_irqs, in order to play any interrupt |
| 267 | * pending for the root domain (i.e. the Linux kernel). This lowers |
| 268 | * the core priority level enough so that Linux IRQ handlers may |
| 269 | * never delay interrupts handled by high priority domains; we defer |
| 270 | * those handlers until this point instead. This is a substitute |
| 271 | * to using a threaded interrupt model for the Linux kernel. |
| 272 | * |
| 273 | * r0: address of user-defined routine |
| 274 | * context: caller must have preempted EVT15, hw interrupts must be off. |
| 275 | */ |
Yi Li | 6a01f23 | 2009-01-07 23:14:39 +0800 | [diff] [blame] | 276 | ENTRY(___ipipe_call_irqtail) |
Philippe Gerum | 9bd50df | 2009-03-04 16:52:38 +0800 | [diff] [blame] | 277 | p0 = r0; |
Yi Li | 6a01f23 | 2009-01-07 23:14:39 +0800 | [diff] [blame] | 278 | r0.l = 1f; |
| 279 | r0.h = 1f; |
| 280 | reti = r0; |
| 281 | rti; |
| 282 | 1: |
| 283 | [--sp] = rets; |
| 284 | [--sp] = ( r7:4, p5:3 ); |
Yi Li | 6a01f23 | 2009-01-07 23:14:39 +0800 | [diff] [blame] | 285 | sp += -12; |
| 286 | call (p0); |
| 287 | sp += 12; |
| 288 | ( r7:4, p5:3 ) = [sp++]; |
| 289 | rets = [sp++]; |
| 290 | |
Philippe Gerum | 70f4720 | 2009-06-22 18:24:18 +0200 | [diff] [blame] | 291 | #ifdef CONFIG_DEBUG_HWERR |
| 292 | /* enable irq14 & hwerr interrupt, until we transition to _evt_evt14 */ |
| 293 | r0 = (EVT_IVG14 | EVT_IVHW | \ |
| 294 | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU); |
| 295 | #else |
| 296 | /* Only enable irq14 interrupt, until we transition to _evt_evt14 */ |
| 297 | r0 = (EVT_IVG14 | \ |
| 298 | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU); |
| 299 | #endif |
Yi Li | 6a01f23 | 2009-01-07 23:14:39 +0800 | [diff] [blame] | 300 | sti r0; |
Philippe Gerum | fc9afb9 | 2009-06-22 18:24:02 +0200 | [diff] [blame] | 301 | raise 14; /* Branches to _evt_evt14 */ |
Yi Li | 6a01f23 | 2009-01-07 23:14:39 +0800 | [diff] [blame] | 302 | 2: |
| 303 | jump 2b; /* Likely paranoid. */ |
Yi Li | 6a01f23 | 2009-01-07 23:14:39 +0800 | [diff] [blame] | 304 | ENDPROC(___ipipe_call_irqtail) |
Philippe Gerum | 9bd50df | 2009-03-04 16:52:38 +0800 | [diff] [blame] | 305 | |
Yi Li | 6a01f23 | 2009-01-07 23:14:39 +0800 | [diff] [blame] | 306 | #endif /* CONFIG_IPIPE */ |