1 /* $NetBSD: pci_machdep.c,v 1.21 2005/12/11 12:18:47 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved. 5 * Copyright (c) 1994 Charles M. Hannum. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Charles M. Hannum. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Machine-specific functions for PCI autoconfiguration. 35 * 36 * On PCs, there are two methods of generating PCI configuration cycles. 37 * We try to detect the appropriate mechanism for this machine and set 38 * up a few function pointers to access the correct method directly. 39 */ 40 41 #include <sys/cdefs.h> 42 __KERNEL_RCSID(0, "$NetBSD: pci_machdep.c,v 1.21 2005/12/11 12:18:47 christos Exp $"); 43 44 #include <sys/types.h> 45 #include <sys/param.h> 46 #include <sys/time.h> 47 #include <sys/systm.h> 48 #include <sys/errno.h> 49 #include <sys/extent.h> 50 #include <sys/device.h> 51 52 #include <uvm/uvm_extern.h> 53 54 #define _POWERPC_BUS_DMA_PRIVATE 55 #include <machine/bus.h> 56 #include <machine/intr.h> 57 #include <machine/platform.h> 58 59 #include <dev/isa/isavar.h> 60 61 #include <dev/pci/pcivar.h> 62 #include <dev/pci/pcireg.h> 63 #include <dev/pci/pcidevs.h> 64 #include <dev/pci/pciconf.h> 65 66 /* 67 * PCI doesn't have any special needs; just use the generic versions 68 * of these functions. 69 */ 70 struct powerpc_bus_dma_tag pci_bus_dma_tag = { 71 0, /* _bounce_thresh */ 72 _bus_dmamap_create, 73 _bus_dmamap_destroy, 74 _bus_dmamap_load, 75 _bus_dmamap_load_mbuf, 76 _bus_dmamap_load_uio, 77 _bus_dmamap_load_raw, 78 _bus_dmamap_unload, 79 NULL, /* _dmamap_sync */ 80 _bus_dmamem_alloc, 81 _bus_dmamem_free, 82 _bus_dmamem_map, 83 _bus_dmamem_unmap, 84 _bus_dmamem_mmap, 85 }; 86 87 int 88 prep_pci_bus_maxdevs(void *v, int busno) 89 { 90 91 /* 92 * Bus number is irrelevant. Configuration Mechanism 1 is in 93 * use, can have devices 0-32 (i.e. the `normal' range). 94 */ 95 return (32); 96 } 97 98 99 int 100 prep_pci_intr_map(struct pci_attach_args *pa, pci_intr_handle_t *ihp) 101 { 102 int pin = pa->pa_intrpin; 103 int line = pa->pa_intrline; 104 105 if (pin == 0) { 106 /* No IRQ used. */ 107 goto bad; 108 } 109 110 if (pin > 4) { 111 printf("pci_intr_map: bad interrupt pin %d\n", pin); 112 goto bad; 113 } 114 115 /* 116 * Section 6.2.4, `Miscellaneous Functions', says that 255 means 117 * `unknown' or `no connection' on a PC. We assume that a device with 118 * `no connection' either doesn't have an interrupt (in which case the 119 * pin number should be 0, and would have been noticed above), or 120 * wasn't configured by the BIOS (in which case we punt, since there's 121 * no real way we can know how the interrupt lines are mapped in the 122 * hardware). 123 * 124 * XXX 125 * Since IRQ 0 is only used by the clock, and we can't actually be sure 126 * that the BIOS did its job, we also recognize that as meaning that 127 * the BIOS has not configured the device. 128 */ 129 if (line == 0 || line == 255) { 130 printf("pci_intr_map: no mapping for pin %c\n", '@' + pin); 131 goto bad; 132 } else { 133 if (line >= ICU_LEN) { 134 printf("pci_intr_map: bad interrupt line %d\n", line); 135 goto bad; 136 } 137 if (line == IRQ_SLAVE) { 138 printf("pci_intr_map: changed line 2 to line 9\n"); 139 line = 9; 140 } 141 } 142 143 *ihp = line; 144 return 0; 145 146 bad: 147 *ihp = -1; 148 return 1; 149 } 150 151 const char * 152 prep_pci_intr_string(void *v, pci_intr_handle_t ih) 153 { 154 static char irqstr[8]; /* 4 + 2 + NULL + sanity */ 155 156 if (ih == 0 || ih >= ICU_LEN || ih == IRQ_SLAVE) 157 panic("pci_intr_string: bogus handle 0x%x", ih); 158 159 sprintf(irqstr, "irq %d", ih); 160 return (irqstr); 161 162 } 163 164 const struct evcnt * 165 prep_pci_intr_evcnt(void *v, pci_intr_handle_t ih) 166 { 167 168 /* XXX for now, no evcnt parent reported */ 169 return NULL; 170 } 171 172 void * 173 prep_pci_intr_establish(void *v, pci_intr_handle_t ih, int level, 174 int (*func)(void *), void *arg) 175 { 176 177 if (ih == 0 || ih >= ICU_LEN || ih == IRQ_SLAVE) 178 panic("pci_intr_establish: bogus handle 0x%x", ih); 179 180 return isa_intr_establish(NULL, ih, IST_LEVEL, level, func, arg); 181 } 182 183 void 184 prep_pci_intr_disestablish(void *v, void *cookie) 185 { 186 187 isa_intr_disestablish(NULL, cookie); 188 } 189 190 void 191 prep_pci_conf_interrupt(void *v, int bus, int dev, int pin, 192 int swiz, int *iline) 193 { 194 195 (*platform->pci_intr_fixup)(bus, dev, swiz, iline); 196 } 197 198 int 199 prep_pci_conf_hook(void *v, int bus, int dev, int func, pcireg_t id) 200 { 201 202 /* 203 * The P9100 board found in some IBM machines cannot be 204 * over-configured. 205 */ 206 if (PCI_VENDOR(id) == PCI_VENDOR_WEITEK && 207 PCI_PRODUCT(id) == PCI_PRODUCT_WEITEK_P9100) 208 return 0; 209 210 return (PCI_CONF_ALL & ~PCI_CONF_MAP_ROM); 211 } 212