1 /* $NetBSD: footbridge_irqhandler.c,v 1.25 2014/04/02 11:35:36 matt Exp $ */ 2 3 /* 4 * Copyright (c) 2001, 2002 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #ifndef ARM_SPL_NOINLINE 39 #define ARM_SPL_NOINLINE 40 #endif 41 42 #include <sys/cdefs.h> 43 __KERNEL_RCSID(0,"$NetBSD: footbridge_irqhandler.c,v 1.25 2014/04/02 11:35:36 matt Exp $"); 44 45 #include "opt_irqstats.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/malloc.h> 50 51 #include <machine/intr.h> 52 #include <machine/cpu.h> 53 #include <arm/footbridge/dc21285mem.h> 54 #include <arm/footbridge/dc21285reg.h> 55 56 #include <dev/pci/pcivar.h> 57 58 #include "isa.h" 59 #if NISA > 0 60 #include <dev/isa/isavar.h> 61 #endif 62 63 /* Interrupt handler queues. */ 64 static struct intrq footbridge_intrq[NIRQ]; 65 66 /* Interrupts to mask at each level. */ 67 int footbridge_imask[NIPL]; 68 69 /* Software copy of the IRQs we have enabled. */ 70 volatile uint32_t intr_enabled; 71 72 /* Interrupts pending */ 73 volatile int footbridge_ipending; 74 75 void footbridge_intr_dispatch(struct clockframe *frame); 76 77 const struct evcnt *footbridge_pci_intr_evcnt(void *, pci_intr_handle_t); 78 79 const struct evcnt * 80 footbridge_pci_intr_evcnt(void *pcv, pci_intr_handle_t ih) 81 { 82 /* XXX check range is valid */ 83 #if NISA > 0 84 if (ih >= 0x80 && ih <= 0x8f) { 85 return isa_intr_evcnt(NULL, (ih & 0x0f)); 86 } 87 #endif 88 return &footbridge_intrq[ih].iq_ev; 89 } 90 91 static inline void 92 footbridge_enable_irq(int irq) 93 { 94 intr_enabled |= (1U << irq); 95 footbridge_set_intrmask(); 96 } 97 98 static inline void 99 footbridge_disable_irq(int irq) 100 { 101 intr_enabled &= ~(1U << irq); 102 footbridge_set_intrmask(); 103 } 104 105 /* 106 * NOTE: This routine must be called with interrupts disabled in the CPSR. 107 */ 108 static void 109 footbridge_intr_calculate_masks(void) 110 { 111 struct intrq *iq; 112 struct intrhand *ih; 113 int irq, ipl; 114 115 /* First, figure out which IPLs each IRQ has. */ 116 for (irq = 0; irq < NIRQ; irq++) { 117 int levels = 0; 118 iq = &footbridge_intrq[irq]; 119 footbridge_disable_irq(irq); 120 TAILQ_FOREACH(ih, &iq->iq_list, ih_list) { 121 levels |= (1U << ih->ih_ipl); 122 } 123 iq->iq_levels = levels; 124 } 125 126 /* Next, figure out which IRQs are used by each IPL. */ 127 for (ipl = 0; ipl < NIPL; ipl++) { 128 int irqs = 0; 129 for (irq = 0; irq < NIRQ; irq++) { 130 if (footbridge_intrq[irq].iq_levels & (1U << ipl)) 131 irqs |= (1U << irq); 132 } 133 footbridge_imask[ipl] = irqs; 134 } 135 136 /* IPL_NONE must open up all interrupts */ 137 KASSERT(footbridge_imask[IPL_NONE] == 0); 138 KASSERT(footbridge_imask[IPL_SOFTCLOCK] == 0); 139 KASSERT(footbridge_imask[IPL_SOFTBIO] == 0); 140 KASSERT(footbridge_imask[IPL_SOFTNET] == 0); 141 KASSERT(footbridge_imask[IPL_SOFTSERIAL] == 0); 142 143 /* 144 * Enforce a hierarchy that gives "slow" device (or devices with 145 * limited input buffer space/"real-time" requirements) a better 146 * chance at not dropping data. 147 */ 148 footbridge_imask[IPL_SCHED] |= footbridge_imask[IPL_VM]; 149 footbridge_imask[IPL_HIGH] |= footbridge_imask[IPL_SCHED]; 150 151 /* 152 * Calculate the ipl level to go to when handling this interrupt 153 */ 154 for (irq = 0, iq = footbridge_intrq; irq < NIRQ; irq++, iq++) { 155 int irqs = (1U << irq); 156 if (!TAILQ_EMPTY(&iq->iq_list)) { 157 footbridge_enable_irq(irq); 158 TAILQ_FOREACH(ih, &iq->iq_list, ih_list) { 159 irqs |= footbridge_imask[ih->ih_ipl]; 160 } 161 } 162 iq->iq_mask = irqs; 163 } 164 } 165 166 int 167 _splraise(int ipl) 168 { 169 return (footbridge_splraise(ipl)); 170 } 171 172 /* this will always take us to the ipl passed in */ 173 void 174 splx(int new) 175 { 176 footbridge_splx(new); 177 } 178 179 int 180 _spllower(int ipl) 181 { 182 return (footbridge_spllower(ipl)); 183 } 184 185 void 186 footbridge_intr_init(void) 187 { 188 struct intrq *iq; 189 int i; 190 191 intr_enabled = 0; 192 set_curcpl(0xffffffff); 193 footbridge_ipending = 0; 194 footbridge_set_intrmask(); 195 196 for (i = 0, iq = footbridge_intrq; i < NIRQ; i++, iq++) { 197 TAILQ_INIT(&iq->iq_list); 198 } 199 200 footbridge_intr_calculate_masks(); 201 202 /* Enable IRQ's, we don't have any FIQ's*/ 203 enable_interrupts(I32_bit); 204 } 205 206 void 207 footbridge_intr_evcnt_attach(void) 208 { 209 struct intrq *iq; 210 int i; 211 212 for (i = 0, iq = footbridge_intrq; i < NIRQ; i++, iq++) { 213 214 snprintf(iq->iq_name, sizeof(iq->iq_name), "irq %d", i); 215 evcnt_attach_dynamic(&iq->iq_ev, EVCNT_TYPE_INTR, 216 NULL, "footbridge", iq->iq_name); 217 } 218 } 219 220 void * 221 footbridge_intr_claim(int irq, int ipl, const char *name, int (*func)(void *), void *arg) 222 { 223 struct intrq *iq; 224 struct intrhand *ih; 225 u_int oldirqstate; 226 227 if (irq < 0 || irq > NIRQ) 228 panic("footbridge_intr_establish: IRQ %d out of range", irq); 229 230 ih = malloc(sizeof(*ih), M_DEVBUF, M_NOWAIT); 231 if (ih == NULL) 232 { 233 printf("No memory"); 234 return (NULL); 235 } 236 237 ih->ih_func = func; 238 ih->ih_arg = arg; 239 ih->ih_ipl = ipl; 240 ih->ih_irq = irq; 241 242 iq = &footbridge_intrq[irq]; 243 244 iq->iq_ist = IST_LEVEL; 245 246 oldirqstate = disable_interrupts(I32_bit); 247 248 TAILQ_INSERT_TAIL(&iq->iq_list, ih, ih_list); 249 250 footbridge_intr_calculate_masks(); 251 252 /* detach the existing event counter and add the new name */ 253 evcnt_detach(&iq->iq_ev); 254 evcnt_attach_dynamic(&iq->iq_ev, EVCNT_TYPE_INTR, 255 NULL, "footbridge", name); 256 257 restore_interrupts(oldirqstate); 258 259 return(ih); 260 } 261 262 void 263 footbridge_intr_disestablish(void *cookie) 264 { 265 struct intrhand *ih = cookie; 266 struct intrq *iq = &footbridge_intrq[ih->ih_irq]; 267 int oldirqstate; 268 269 /* XXX need to free ih ? */ 270 oldirqstate = disable_interrupts(I32_bit); 271 272 TAILQ_REMOVE(&iq->iq_list, ih, ih_list); 273 274 footbridge_intr_calculate_masks(); 275 276 restore_interrupts(oldirqstate); 277 } 278 279 static inline uint32_t footbridge_intstatus(void) 280 { 281 return ((volatile uint32_t*)(DC21285_ARMCSR_VBASE))[IRQ_STATUS>>2]; 282 } 283 284 /* called with external interrupts disabled */ 285 void 286 footbridge_intr_dispatch(struct clockframe *frame) 287 { 288 struct intrq *iq; 289 struct intrhand *ih; 290 int oldirqstate, irq, ibit, hwpend; 291 struct cpu_info * const ci = curcpu(); 292 const int ppl = ci->ci_cpl; 293 const int imask = footbridge_imask[ppl]; 294 295 hwpend = footbridge_intstatus(); 296 297 /* 298 * Disable all the interrupts that are pending. We will 299 * reenable them once they are processed and not masked. 300 */ 301 intr_enabled &= ~hwpend; 302 footbridge_set_intrmask(); 303 304 while (hwpend != 0) { 305 int intr_rc = 0; 306 irq = ffs(hwpend) - 1; 307 ibit = (1U << irq); 308 309 hwpend &= ~ibit; 310 311 if (imask & ibit) { 312 /* 313 * IRQ is masked; mark it as pending and check 314 * the next one. Note: the IRQ is already disabled. 315 */ 316 footbridge_ipending |= ibit; 317 continue; 318 } 319 320 footbridge_ipending &= ~ibit; 321 322 iq = &footbridge_intrq[irq]; 323 iq->iq_ev.ev_count++; 324 ci->ci_data.cpu_nintr++; 325 TAILQ_FOREACH(ih, &iq->iq_list, ih_list) { 326 ci->ci_cpl = ih->ih_ipl; 327 oldirqstate = enable_interrupts(I32_bit); 328 intr_rc = (*ih->ih_func)(ih->ih_arg ? ih->ih_arg : frame); 329 restore_interrupts(oldirqstate); 330 if (intr_rc != 1) 331 break; 332 } 333 334 ci->ci_cpl = ppl; 335 336 /* Re-enable this interrupt now that's it's cleared. */ 337 intr_enabled |= ibit; 338 footbridge_set_intrmask(); 339 340 /* also check for any new interrupts that may have occurred, 341 * that we can handle at this spl level */ 342 hwpend |= (footbridge_ipending & ICU_INT_HWMASK) & ~imask; 343 } 344 345 #ifdef __HAVE_FAST_SOFTINTS 346 cpu_dosoftints(); 347 #endif /* __HAVE_FAST_SOFTINTS */ 348 } 349