projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| a6475c13 MS |
2 | /* |
| 3 | * Support for indirect PCI bridges. | |
| 4 | * | |
| 5 | * Copyright (C) 1998 Gabriel Paubert. | |
| a6475c13 MS |
6 | */ |
| 7 | ||
| 8 | #include <linux/kernel.h> | |
| 9 | #include <linux/pci.h> | |
| 10 | #include <linux/delay.h> | |
| 11 | #include <linux/string.h> | |
| 12 | #include <linux/init.h> | |
| 13 | ||
| 6bd55f0b | 14 | #include <linux/io.h> |
| a6475c13 MS |
15 | #include <asm/pci-bridge.h> |
| 16 | ||
| 17 | static int | |
| 18 | indirect_read_config(struct pci_bus *bus, unsigned int devfn, int offset, | |
| 19 | int len, u32 *val) | |
| 20 | { | |
| 21 | struct pci_controller *hose = pci_bus_to_host(bus); | |
| 22 | volatile void __iomem *cfg_data; | |
| 23 | u8 cfg_type = 0; | |
| 24 | u32 bus_no, reg; | |
| 25 | ||
| 26 | if (hose->indirect_type & INDIRECT_TYPE_NO_PCIE_LINK) { | |
| 27 | if (bus->number != hose->first_busno) | |
| 28 | return PCIBIOS_DEVICE_NOT_FOUND; | |
| 29 | if (devfn != 0) | |
| 30 | return PCIBIOS_DEVICE_NOT_FOUND; | |
| 31 | } | |
| 32 | ||
| 33 | if (hose->indirect_type & INDIRECT_TYPE_SET_CFG_TYPE) | |
| 34 | if (bus->number != hose->first_busno) | |
| 35 | cfg_type = 1; | |
| 36 | ||
| 37 | bus_no = (bus->number == hose->first_busno) ? | |
| 38 | hose->self_busno : bus->number; | |
| 39 | ||
| 40 | if (hose->indirect_type & INDIRECT_TYPE_EXT_REG) | |
| 41 | reg = ((offset & 0xf00) << 16) | (offset & 0xfc); | |
| 42 | else | |
| 43 | reg = offset & 0xfc; /* Only 3 bits for function */ | |
| 44 | ||
| 45 | if (hose->indirect_type & INDIRECT_TYPE_BIG_ENDIAN) | |
| 46 | out_be32(hose->cfg_addr, (0x80000000 | (bus_no << 16) | | |
| 47 | (devfn << 8) | reg | cfg_type)); | |
| 48 | else | |
| 49 | out_le32(hose->cfg_addr, (0x80000000 | (bus_no << 16) | | |
| 50 | (devfn << 8) | reg | cfg_type)); | |
| 51 | ||
| 52 | /* | |
| 53 | * Note: the caller has already checked that offset is | |
| 54 | * suitably aligned and that len is 1, 2 or 4. | |
| 55 | */ | |
| 56 | cfg_data = hose->cfg_data + (offset & 3); /* Only 3 bits for function */ | |
| 57 | switch (len) { | |
| 58 | case 1: | |
| 59 | *val = in_8(cfg_data); | |
| 60 | break; | |
| 61 | case 2: | |
| 62 | *val = in_le16(cfg_data); | |
| 63 | break; | |
| 64 | default: | |
| 65 | *val = in_le32(cfg_data); | |
| 66 | break; | |
| 67 | } | |
| 68 | return PCIBIOS_SUCCESSFUL; | |
| 69 | } | |
| 70 | ||
| 71 | static int | |
| 72 | indirect_write_config(struct pci_bus *bus, unsigned int devfn, int offset, | |
| 73 | int len, u32 val) | |
| 74 | { | |
| 75 | struct pci_controller *hose = pci_bus_to_host(bus); | |
| 76 | volatile void __iomem *cfg_data; | |
| 77 | u8 cfg_type = 0; | |
| 78 | u32 bus_no, reg; | |
| 79 | ||
| 80 | if (hose->indirect_type & INDIRECT_TYPE_NO_PCIE_LINK) { | |
| 81 | if (bus->number != hose->first_busno) | |
| 82 | return PCIBIOS_DEVICE_NOT_FOUND; | |
| 83 | if (devfn != 0) | |
| 84 | return PCIBIOS_DEVICE_NOT_FOUND; | |
| 85 | } | |
| 86 | ||
| 87 | if (hose->indirect_type & INDIRECT_TYPE_SET_CFG_TYPE) | |
| 88 | if (bus->number != hose->first_busno) | |
| 89 | cfg_type = 1; | |
| 90 | ||
| 91 | bus_no = (bus->number == hose->first_busno) ? | |
| 92 | hose->self_busno : bus->number; | |
| 93 | ||
| 94 | if (hose->indirect_type & INDIRECT_TYPE_EXT_REG) | |
| 95 | reg = ((offset & 0xf00) << 16) | (offset & 0xfc); | |
| 96 | else | |
| 97 | reg = offset & 0xfc; | |
| 98 | ||
| 99 | if (hose->indirect_type & INDIRECT_TYPE_BIG_ENDIAN) | |
| 100 | out_be32(hose->cfg_addr, (0x80000000 | (bus_no << 16) | | |
| 101 | (devfn << 8) | reg | cfg_type)); | |
| 102 | else | |
| 103 | out_le32(hose->cfg_addr, (0x80000000 | (bus_no << 16) | | |
| 104 | (devfn << 8) | reg | cfg_type)); | |
| 105 | ||
| 25985edc | 106 | /* suppress setting of PCI_PRIMARY_BUS */ |
| a6475c13 MS |
107 | if (hose->indirect_type & INDIRECT_TYPE_SURPRESS_PRIMARY_BUS) |
| 108 | if ((offset == PCI_PRIMARY_BUS) && | |
| 109 | (bus->number == hose->first_busno)) | |
| 110 | val &= 0xffffff00; | |
| 111 | ||
| 112 | /* Workaround for PCI_28 Errata in 440EPx/GRx */ | |
| 113 | if ((hose->indirect_type & INDIRECT_TYPE_BROKEN_MRM) && | |
| 114 | offset == PCI_CACHE_LINE_SIZE) { | |
| 115 | val = 0; | |
| 116 | } | |
| 117 | ||
| 118 | /* | |
| 119 | * Note: the caller has already checked that offset is | |
| 120 | * suitably aligned and that len is 1, 2 or 4. | |
| 121 | */ | |
| 122 | cfg_data = hose->cfg_data + (offset & 3); | |
| 123 | switch (len) { | |
| 124 | case 1: | |
| 125 | out_8(cfg_data, val); | |
| 126 | break; | |
| 127 | case 2: | |
| 128 | out_le16(cfg_data, val); | |
| 129 | break; | |
| 130 | default: | |
| 131 | out_le32(cfg_data, val); | |
| 132 | break; | |
| 133 | } | |
| 134 | ||
| 135 | return PCIBIOS_SUCCESSFUL; | |
| 136 | } | |
| 137 | ||
| 138 | static struct pci_ops indirect_pci_ops = { | |
| 139 | .read = indirect_read_config, | |
| 140 | .write = indirect_write_config, | |
| 141 | }; | |
| 142 | ||
| 143 | void __init | |
| 144 | setup_indirect_pci(struct pci_controller *hose, | |
| 145 | resource_size_t cfg_addr, | |
| 146 | resource_size_t cfg_data, u32 flags) | |
| 147 | { | |
| 148 | resource_size_t base = cfg_addr & PAGE_MASK; | |
| 149 | void __iomem *mbase; | |
| 150 | ||
| 151 | mbase = ioremap(base, PAGE_SIZE); | |
| 152 | hose->cfg_addr = mbase + (cfg_addr & ~PAGE_MASK); | |
| 153 | if ((cfg_data & PAGE_MASK) != base) | |
| 154 | mbase = ioremap(cfg_data & PAGE_MASK, PAGE_SIZE); | |
| 155 | hose->cfg_data = mbase + (cfg_data & ~PAGE_MASK); | |
| 156 | hose->ops = &indirect_pci_ops; | |
| 157 | hose->indirect_type = flags; | |
| 158 | } |