pci_kn300.c revision 1.40
1 /* $NetBSD: pci_kn300.c,v 1.40 2021/06/19 16:59:07 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1998 by Matthew Jacob 5 * NASA AMES Research Center. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice immediately at the beginning of the file, without modification, 13 * 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. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 24 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 34 35 __KERNEL_RCSID(0, "$NetBSD: pci_kn300.c,v 1.40 2021/06/19 16:59:07 thorpej Exp $"); 36 37 #include <sys/types.h> 38 #include <sys/param.h> 39 #include <sys/time.h> 40 #include <sys/systm.h> 41 #include <sys/errno.h> 42 #include <sys/malloc.h> 43 #include <sys/device.h> 44 #include <sys/cpu.h> 45 #include <sys/syslog.h> 46 47 #include <machine/autoconf.h> 48 #include <machine/rpb.h> 49 50 #include <dev/pci/pcireg.h> 51 #include <dev/pci/pcivar.h> 52 53 #include <alpha/mcbus/mcbusvar.h> 54 #include <alpha/mcbus/mcbusreg.h> 55 #include <alpha/pci/mcpciareg.h> 56 #include <alpha/pci/mcpciavar.h> 57 58 #include "sio.h" 59 #if NSIO > 0 || NPCEB > 0 60 #include <alpha/pci/siovar.h> 61 #endif 62 63 static int dec_kn300_intr_map(const struct pci_attach_args *, 64 pci_intr_handle_t *); 65 static const char *dec_kn300_intr_string(pci_chipset_tag_t, pci_intr_handle_t, 66 char *, size_t); 67 static const struct evcnt *dec_kn300_intr_evcnt(pci_chipset_tag_t, 68 pci_intr_handle_t); 69 static void *dec_kn300_intr_establish(pci_chipset_tag_t, 70 pci_intr_handle_t, int, int (*func)(void *), void *); 71 static void dec_kn300_intr_disestablish(pci_chipset_tag_t, void *); 72 73 #define KN300_PCEB_IRQ 16 74 #define NPIN 4 75 76 #define NIRQ (MAX_MC_BUS * MCPCIA_PER_MCBUS * MCPCIA_MAXSLOT * NPIN) 77 static int savirqs[NIRQ]; 78 79 static struct alpha_shared_intr *kn300_pci_intr; 80 81 static struct mcpcia_config *mcpcia_eisaccp = NULL; 82 83 static void kn300_iointr(void *, unsigned long); 84 static void kn300_enable_intr(struct mcpcia_config *, int); 85 static void kn300_disable_intr(struct mcpcia_config *, int); 86 87 static void 88 pci_kn300_pickintr(void *core, bus_space_tag_t iot, bus_space_tag_t memt, 89 pci_chipset_tag_t pc) 90 { 91 struct mcpcia_config *ccp = core; 92 char *cp; 93 94 if (kn300_pci_intr == NULL) { 95 int g; 96 97 #define PCI_KN300_IRQ_STR 16 98 kn300_pci_intr = alpha_shared_intr_alloc(NIRQ, 99 PCI_KN300_IRQ_STR); 100 for (g = 0; g < NIRQ; g++) { 101 alpha_shared_intr_set_maxstrays(kn300_pci_intr, g, 25); 102 cp = alpha_shared_intr_string(kn300_pci_intr, g); 103 snprintf(cp, PCI_KN300_IRQ_STR, "irq %d", g); 104 evcnt_attach_dynamic(alpha_shared_intr_evcnt( 105 kn300_pci_intr, g), EVCNT_TYPE_INTR, NULL, 106 "kn300", cp); 107 savirqs[g] = (char) -1; 108 } 109 } 110 111 pc->pc_intr_v = core; 112 pc->pc_intr_map = dec_kn300_intr_map; 113 pc->pc_intr_string = dec_kn300_intr_string; 114 pc->pc_intr_evcnt = dec_kn300_intr_evcnt; 115 pc->pc_intr_establish = dec_kn300_intr_establish; 116 pc->pc_intr_disestablish = dec_kn300_intr_disestablish; 117 118 /* Not supported on KN300. */ 119 pc->pc_pciide_compat_intr_establish = NULL; 120 121 if (EISA_PRESENT(REGVAL(MCPCIA_PCI_REV(ccp)))) { 122 mcpcia_eisaccp = ccp; 123 #if NSIO > 0 || NPCEB > 0 124 sio_intr_setup(pc, &ccp->cc_iot); 125 kn300_enable_intr(ccp, KN300_PCEB_IRQ); 126 #endif 127 } 128 } 129 ALPHA_PCI_INTR_INIT(ST_DEC_4100, pci_kn300_pickintr) 130 131 static int 132 dec_kn300_intr_map(const struct pci_attach_args *pa, pci_intr_handle_t *ihp) 133 { 134 pcitag_t bustag = pa->pa_intrtag; 135 int buspin = pa->pa_intrpin; 136 pci_chipset_tag_t pc = pa->pa_pc; 137 struct mcpcia_config *ccp = (struct mcpcia_config *)pc->pc_intr_v; 138 int device; 139 int mcpcia_irq; 140 141 if (buspin == 0) { 142 /* No IRQ used. */ 143 return 1; 144 } 145 if (buspin < 0 || buspin > 4) { 146 printf("dec_kn300_intr_map: bad interrupt pin %d\n", buspin); 147 return 1; 148 } 149 150 pci_decompose_tag(pc, bustag, NULL, &device, NULL); 151 152 /* 153 * On MID 5 device 1 is the internal NCR 53c810. 154 */ 155 if (ccp->cc_mid == 5 && device == 1) { 156 mcpcia_irq = 16; 157 } else if (device >= 2 && device <= 5) { 158 mcpcia_irq = (device - 2) * 4 + buspin - 1; 159 } else { 160 printf("dec_kn300_intr_map: weird device number %d\n", device); 161 return(1); 162 } 163 164 /* 165 * handle layout: 166 * 167 * Determine kn300 IRQ (encoded in SCB vector): 168 * bits 0..1 buspin-1 169 * bits 2..4 PCI Slot (0..7- yes, some don't exist) 170 * bits 5..7 MID-4 171 * bits 8..10 7-GID 172 * 173 * Software only: 174 * bits 11-15 MCPCIA IRQ 175 */ 176 const u_int irq = 177 (buspin - 1 ) | 178 ((device & 0x7) << 2) | 179 ((ccp->cc_mid - 4) << 5) | 180 ((7 - ccp->cc_gid) << 8) | 181 (mcpcia_irq << 11); 182 alpha_pci_intr_handle_init(ihp, irq, 0); 183 return (0); 184 } 185 186 static const char * 187 dec_kn300_intr_string(pci_chipset_tag_t const pc __unused, 188 pci_intr_handle_t const ih, char * const buf, size_t const len) 189 { 190 const u_int irq = alpha_pci_intr_handle_get_irq(&ih) & 0x3ff; 191 192 snprintf(buf, len, "kn300 irq %u", irq); 193 return buf; 194 } 195 196 static const struct evcnt * 197 dec_kn300_intr_evcnt(pci_chipset_tag_t const pc __unused, 198 pci_intr_handle_t const ih) 199 { 200 const u_int irq = alpha_pci_intr_handle_get_irq(&ih) & 0x3ff; 201 202 return alpha_shared_intr_evcnt(kn300_pci_intr, irq); 203 } 204 205 static void * 206 dec_kn300_intr_establish( 207 pci_chipset_tag_t const pc, 208 pci_intr_handle_t const ih, 209 int const level, 210 int (*func)(void *), 211 void *arg) 212 { 213 struct mcpcia_config * const ccp = pc->pc_intr_v; 214 void *cookie; 215 const u_int ihv = alpha_pci_intr_handle_get_irq(&ih); 216 const u_int irq = ihv & 0x3ff; 217 const u_int flags = alpha_pci_intr_handle_get_flags(&ih); 218 219 cookie = alpha_shared_intr_alloc_intrhand(kn300_pci_intr, irq, 220 IST_LEVEL, level, flags, func, arg, "kn300 irq"); 221 222 if (cookie == NULL) 223 return NULL; 224 225 mutex_enter(&cpu_lock); 226 227 if (! alpha_shared_intr_link(kn300_pci_intr, cookie, "kn300 irq")) { 228 mutex_exit(&cpu_lock); 229 alpha_shared_intr_free_intrhand(cookie); 230 return NULL; 231 } 232 233 if (alpha_shared_intr_firstactive(kn300_pci_intr, irq)) { 234 scb_set(MCPCIA_VEC_PCI + SCB_IDXTOVEC(irq), kn300_iointr, NULL); 235 alpha_shared_intr_set_private(kn300_pci_intr, irq, ccp); 236 savirqs[irq] = (ihv >> 11) & 0x1f; 237 alpha_mb(); 238 kn300_enable_intr(ccp, savirqs[irq]); 239 } 240 241 mutex_exit(&cpu_lock); 242 243 return cookie; 244 } 245 246 static void 247 dec_kn300_intr_disestablish(pci_chipset_tag_t const pc __unused, 248 void * const cookie __unused) 249 { 250 panic("dec_kn300_intr_disestablish not implemented"); 251 } 252 253 static void 254 kn300_iointr(void * const arg __unused, unsigned long const vec) 255 { 256 struct mcpcia_softc *mcp; 257 u_long irq; 258 259 irq = SCB_VECTOIDX(vec - MCPCIA_VEC_PCI); 260 261 if (alpha_shared_intr_dispatch(kn300_pci_intr, irq)) { 262 /* 263 * Any claim of an interrupt at this level is a hint to 264 * reset the stray interrupt count- elsewise a slow leak 265 * over time will cause this level to be shutdown. 266 */ 267 alpha_shared_intr_reset_strays(kn300_pci_intr, irq); 268 return; 269 } 270 271 /* 272 * If we haven't finished configuring yet, or there is no mcp 273 * registered for this level yet, just return. 274 */ 275 mcp = alpha_shared_intr_get_private(kn300_pci_intr, irq); 276 if (mcp == NULL || mcp->mcpcia_cc == NULL) 277 return; 278 279 /* 280 * We're getting an interrupt for a device we haven't enabled. 281 * We had better not try and use -1 to find the right bit to disable. 282 */ 283 if (savirqs[irq] == -1) { 284 printf("kn300_iointr: stray interrupt vector 0x%lx\n", vec); 285 return; 286 } 287 288 /* 289 * Stray interrupt; disable the IRQ on the appropriate MCPCIA 290 * if we've reached the limit. 291 */ 292 alpha_shared_intr_stray(kn300_pci_intr, irq, "kn300 irq"); 293 if (ALPHA_SHARED_INTR_DISABLE(kn300_pci_intr, irq) == 0) 294 return; 295 kn300_disable_intr(mcp->mcpcia_cc, savirqs[irq]); 296 } 297 298 static void 299 kn300_enable_intr(struct mcpcia_config * const ccp, int const irq) 300 { 301 alpha_mb(); 302 REGVAL(MCPCIA_INT_MASK0(ccp)) |= (1 << irq); 303 alpha_mb(); 304 } 305 306 static void 307 kn300_disable_intr(struct mcpcia_config * const ccp, int const irq) 308 { 309 alpha_mb(); 310 REGVAL(MCPCIA_INT_MASK0(ccp)) &= ~(1 << irq); 311 alpha_mb(); 312 } 313
Indexes created Sun Oct 12 20:09:57 GMT 2025