2 * The PCI Library -- Generic Direct Access Functions
4 * Copyright (c) 1997--2022 Martin Mares <mj@ucw.cz>
6 * Can be freely distributed and used under the terms of the GNU GPL.
14 pci_generic_scan_bus(struct pci_access *a, byte *busmap, int bus)
19 a->debug("Scanning bus %02x for devices...\n", bus);
22 a->warning("Bus %02x seen twice (firmware bug). Ignored.", bus);
28 for (dev=0; dev<32; dev++)
32 for (t->func=0; !t->func || multi && t->func<8; t->func++)
34 u32 vd = pci_read_long(t, PCI_VENDOR_ID);
37 if (!vd || vd == 0xffffffff)
39 ht = pci_read_byte(t, PCI_HEADER_TYPE);
47 d->vendor_id = vd & 0xffff;
48 d->device_id = vd >> 16U;
49 d->known_fields = PCI_FILL_IDENT;
54 case PCI_HEADER_TYPE_NORMAL:
56 case PCI_HEADER_TYPE_BRIDGE:
57 case PCI_HEADER_TYPE_CARDBUS:
58 pci_generic_scan_bus(a, busmap, pci_read_byte(t, PCI_SECONDARY_BUS));
61 a->debug("Device %04x:%02x:%02x.%d has unknown header type %02x.\n", d->domain, d->bus, d->dev, d->func, ht);
69 pci_generic_scan(struct pci_access *a)
73 memset(busmap, 0, sizeof(busmap));
74 pci_generic_scan_bus(a, busmap, 0);
78 get_hdr_type(struct pci_dev *d)
81 d->hdrtype = pci_read_byte(d, PCI_HEADER_TYPE) & 0x7f;
86 pci_generic_fill_info(struct pci_dev *d, unsigned int flags)
88 struct pci_access *a = d->access;
90 if (want_fill(d, flags, PCI_FILL_IDENT))
92 d->vendor_id = pci_read_word(d, PCI_VENDOR_ID);
93 d->device_id = pci_read_word(d, PCI_DEVICE_ID);
96 if (want_fill(d, flags, PCI_FILL_CLASS))
97 d->device_class = pci_read_word(d, PCI_CLASS_DEVICE);
99 if (want_fill(d, flags, PCI_FILL_IRQ))
100 d->irq = pci_read_byte(d, PCI_INTERRUPT_LINE);
102 if (want_fill(d, flags, PCI_FILL_BASES))
105 memset(d->base_addr, 0, sizeof(d->base_addr));
106 switch (get_hdr_type(d))
108 case PCI_HEADER_TYPE_NORMAL:
111 case PCI_HEADER_TYPE_BRIDGE:
114 case PCI_HEADER_TYPE_CARDBUS:
120 for (i=0; i<cnt; i++)
122 u32 x = pci_read_long(d, PCI_BASE_ADDRESS_0 + i*4);
123 if (!x || x == (u32) ~0)
125 if ((x & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO)
129 if ((x & PCI_BASE_ADDRESS_MEM_TYPE_MASK) != PCI_BASE_ADDRESS_MEM_TYPE_64)
132 a->warning("%04x:%02x:%02x.%d: Invalid 64-bit address seen for BAR %d.", d->domain, d->bus, d->dev, d->func, i);
135 u32 y = pci_read_long(d, PCI_BASE_ADDRESS_0 + (++i)*4);
136 #ifdef PCI_HAVE_64BIT_ADDRESS
137 d->base_addr[i-1] = x | (((pciaddr_t) y) << 32);
140 a->warning("%04x:%02x:%02x.%d 64-bit device address ignored.", d->domain, d->bus, d->dev, d->func);
142 d->base_addr[i-1] = x;
150 if (want_fill(d, flags, PCI_FILL_ROM_BASE))
153 d->rom_base_addr = 0;
154 switch (get_hdr_type(d))
156 case PCI_HEADER_TYPE_NORMAL:
157 reg = PCI_ROM_ADDRESS;
159 case PCI_HEADER_TYPE_BRIDGE:
160 reg = PCI_ROM_ADDRESS1;
165 u32 u = pci_read_long(d, reg);
167 d->rom_base_addr = u;
171 pci_scan_caps(d, flags);
175 pci_generic_block_op(struct pci_dev *d, int pos, byte *buf, int len,
176 int (*r)(struct pci_dev *d, int pos, byte *buf, int len))
178 if ((pos & 1) && len >= 1)
180 if (!r(d, pos, buf, 1))
184 if ((pos & 3) && len >= 2)
186 if (!r(d, pos, buf, 2))
188 pos += 2; buf += 2; len -= 2;
192 if (!r(d, pos, buf, 4))
194 pos += 4; buf += 4; len -= 4;
198 if (!r(d, pos, buf, 2))
200 pos += 2; buf += 2; len -= 2;
202 if (len && !r(d, pos, buf, 1))
208 pci_generic_block_read(struct pci_dev *d, int pos, byte *buf, int len)
210 return pci_generic_block_op(d, pos, buf, len, d->access->methods->read);
214 pci_generic_block_write(struct pci_dev *d, int pos, byte *buf, int len)
216 return pci_generic_block_op(d, pos, buf, len, d->access->methods->write);