1 /* $NetBSD: pci_machdep.c,v 1.1 2002/02/27 21:02:26 scw 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/types.h> 42 #include <sys/param.h> 43 #include <sys/time.h> 44 #include <sys/systm.h> 45 #include <sys/errno.h> 46 #include <sys/device.h> 47 48 #include <uvm/uvm_extern.h> 49 50 #define _POWERPC_BUS_DMA_PRIVATE 51 #include <machine/bus.h> 52 #include <machine/intr.h> 53 #include <machine/platform.h> 54 55 #include <dev/isa/isavar.h> 56 #include <dev/pci/pcivar.h> 57 #include <dev/pci/pcireg.h> 58 #include <dev/pci/pcidevs.h> 59 60 #define PCI_MODE1_ENABLE 0x80000000UL 61 #define PCI_MODE1_ADDRESS_REG (MVMEPPC_KVA_BASE_IO + 0xcf8) 62 #define PCI_MODE1_DATA_REG (MVMEPPC_KVA_BASE_IO + 0xcfc) 63 64 #define o2i(off) ((off)/sizeof(pcireg_t)) 65 66 void pci_intr_fixup(int, int, int *); 67 68 #ifdef DEBUG 69 #define DPRF(x) printf x 70 #else 71 #define DPRF(x) 72 #endif 73 74 /* 75 * PCI doesn't have any special needs; just use the generic versions 76 * of these functions. 77 */ 78 struct powerpc_bus_dma_tag pci_bus_dma_tag = { 79 0, /* _bounce_thresh */ 80 _bus_dmamap_create, 81 _bus_dmamap_destroy, 82 _bus_dmamap_load, 83 _bus_dmamap_load_mbuf, 84 _bus_dmamap_load_uio, 85 _bus_dmamap_load_raw, 86 _bus_dmamap_unload, 87 NULL, /* _dmamap_sync */ 88 _bus_dmamem_alloc, 89 _bus_dmamem_free, 90 _bus_dmamem_map, 91 _bus_dmamem_unmap, 92 _bus_dmamem_mmap, 93 }; 94 95 void 96 pci_attach_hook(struct device *parent, struct device *self, 97 struct pcibus_attach_args *pba) 98 { 99 100 /* Nothing to do. */ 101 } 102 103 int 104 pci_bus_maxdevs(pci_chipset_tag_t pc, int busno) 105 { 106 107 /* 108 * Bus number is irrelevant. Configuration Mechanism 1 is in 109 * use, can have devices 0-32 (i.e. the `normal' range). 110 */ 111 return (32); 112 } 113 114 pcitag_t 115 pci_make_tag(pci_chipset_tag_t pc, int bus, int device, int function) 116 { 117 pcitag_t tag; 118 119 if (bus >= 256 || device >= 32 || function >= 8) 120 panic("pci_make_tag: bad request"); 121 122 tag = PCI_MODE1_ENABLE | 123 (bus << 16) | (device << 11) | (function << 8); 124 return tag; 125 } 126 127 void 128 pci_decompose_tag(pci_chipset_tag_t pc, pcitag_t tag, int *bp, int *dp, int *fp) 129 { 130 131 if (bp != NULL) 132 *bp = (tag >> 16) & 0xff; 133 if (dp != NULL) 134 *dp = (tag >> 11) & 0x1f; 135 if (fp != NULL) 136 *fp = (tag >> 8) & 0x7; 137 return; 138 } 139 140 pcireg_t 141 pci_conf_read(pci_chipset_tag_t pc, pcitag_t tag, int reg) 142 { 143 pcireg_t data; 144 145 out32rb(PCI_MODE1_ADDRESS_REG, tag | reg); 146 data = in32rb(PCI_MODE1_DATA_REG); 147 out32rb(PCI_MODE1_ADDRESS_REG, 0); 148 return data; 149 } 150 151 void 152 pci_conf_write(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t data) 153 { 154 155 out32rb(PCI_MODE1_ADDRESS_REG, tag | reg); 156 out32rb(PCI_MODE1_DATA_REG, data); 157 out32rb(PCI_MODE1_ADDRESS_REG, 0); 158 } 159 160 int 161 pci_intr_map(struct pci_attach_args *pa, pci_intr_handle_t *ihp) 162 { 163 int pin = pa->pa_intrpin; 164 int line = pa->pa_intrline; 165 166 if (pin == 0) { 167 /* No IRQ used. */ 168 goto bad; 169 } 170 171 if (pin > 4) { 172 printf("pci_intr_map: bad interrupt pin %d\n", pin); 173 goto bad; 174 } 175 176 /* 177 * Section 6.2.4, `Miscellaneous Functions', says that 255 means 178 * `unknown' or `no connection' on a PC. We assume that a device with 179 * `no connection' either doesn't have an interrupt (in which case the 180 * pin number should be 0, and would have been noticed above), or 181 * wasn't configured by the BIOS (in which case we punt, since there's 182 * no real way we can know how the interrupt lines are mapped in the 183 * hardware). 184 * 185 * XXX 186 * Since IRQ 0 is only used by the clock, and we can't actually be sure 187 * that the BIOS did its job, we also recognize that as meaning that 188 * the BIOS has not configured the device. 189 */ 190 if (line == 0 || line == 255) { 191 printf("pci_intr_map: no mapping for pin %c\n", '@' + pin); 192 goto bad; 193 } else { 194 if (line >= ICU_LEN) { 195 printf("pci_intr_map: bad interrupt line %d\n", line); 196 goto bad; 197 } 198 if (line == IRQ_SLAVE) { 199 printf("pci_intr_map: changed line 2 to line 9\n"); 200 line = 9; 201 } 202 } 203 204 *ihp = line; 205 return 0; 206 207 bad: 208 *ihp = -1; 209 return 1; 210 } 211 212 const char * 213 pci_intr_string(pci_chipset_tag_t pc, pci_intr_handle_t ih) 214 { 215 static char irqstr[8]; /* 4 + 2 + NULL + sanity */ 216 217 if (ih == 0 || ih >= ICU_LEN || ih == IRQ_SLAVE) 218 panic("pci_intr_string: bogus handle 0x%x\n", ih); 219 220 sprintf(irqstr, "irq %d", ih); 221 return (irqstr); 222 223 } 224 225 const struct evcnt * 226 pci_intr_evcnt(pci_chipset_tag_t pc, pci_intr_handle_t ih) 227 { 228 229 /* XXX for now, no evcnt parent reported */ 230 return NULL; 231 } 232 233 void * 234 pci_intr_establish(pci_chipset_tag_t pc, pci_intr_handle_t ih, int level, 235 int (*func)(void *), void *arg) 236 { 237 238 if (ih == 0 || ih >= ICU_LEN || ih == IRQ_SLAVE) 239 panic("pci_intr_establish: bogus handle 0x%x\n", ih); 240 241 return isa_intr_establish(NULL, ih, IST_LEVEL, level, func, arg); 242 } 243 244 void 245 pci_intr_disestablish(pci_chipset_tag_t pc, void *cookie) 246 { 247 248 isa_intr_disestablish(NULL, cookie); 249 } 250 251 void 252 pci_conf_interrupt(pci_chipset_tag_t pc, int bus, int dev, int pin, 253 int swiz, int *iline) 254 { 255 256 (*platform->pci_intr_fixup)(bus, dev, iline); 257 } 258