projects / mirror_ubuntu-focal-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
| c7d3555a HC |
2 | #include <linux/types.h> |
| 3 | #include <linux/pci.h> | |
| 4 | #include <linux/kernel.h> | |
| 5 | ||
| 6 | #include <asm/mips-boards/bonito64.h> | |
| 7 | ||
| 8 | #include <loongson.h> | |
| 9 | ||
| 10 | #define PCI_ACCESS_READ 0 | |
| 11 | #define PCI_ACCESS_WRITE 1 | |
| 12 | ||
| 13 | #define HT1LO_PCICFG_BASE 0x1a000000 | |
| 14 | #define HT1LO_PCICFG_BASE_TP1 0x1b000000 | |
| 15 | ||
| 16 | static int loongson3_pci_config_access(unsigned char access_type, | |
| 17 | struct pci_bus *bus, unsigned int devfn, | |
| 18 | int where, u32 *data) | |
| 19 | { | |
| 20 | unsigned char busnum = bus->number; | |
| 21 | u_int64_t addr, type; | |
| 22 | void *addrp; | |
| 23 | int device = PCI_SLOT(devfn); | |
| 24 | int function = PCI_FUNC(devfn); | |
| 25 | int reg = where & ~3; | |
| 26 | ||
| 27 | addr = (busnum << 16) | (device << 11) | (function << 8) | reg; | |
| 28 | if (busnum == 0) { | |
| 29 | if (device > 31) | |
| 30 | return PCIBIOS_DEVICE_NOT_FOUND; | |
| 31 | addrp = (void *)(TO_UNCAC(HT1LO_PCICFG_BASE) | (addr & 0xffff)); | |
| 32 | type = 0; | |
| 33 | ||
| 34 | } else { | |
| 35 | addrp = (void *)(TO_UNCAC(HT1LO_PCICFG_BASE_TP1) | (addr)); | |
| 36 | type = 0x10000; | |
| 37 | } | |
| 38 | ||
| 39 | if (access_type == PCI_ACCESS_WRITE) | |
| 40 | writel(*data, addrp); | |
| 41 | else { | |
| 42 | *data = readl(addrp); | |
| 43 | if (*data == 0xffffffff) { | |
| 44 | *data = -1; | |
| 45 | return PCIBIOS_DEVICE_NOT_FOUND; | |
| 46 | } | |
| 47 | } | |
| 48 | return PCIBIOS_SUCCESSFUL; | |
| 49 | } | |
| 50 | ||
| 51 | static int loongson3_pci_pcibios_read(struct pci_bus *bus, unsigned int devfn, | |
| 52 | int where, int size, u32 *val) | |
| 53 | { | |
| 54 | u32 data = 0; | |
| 55 | int ret = loongson3_pci_config_access(PCI_ACCESS_READ, | |
| 56 | bus, devfn, where, &data); | |
| 57 | ||
| 58 | if (ret != PCIBIOS_SUCCESSFUL) | |
| 59 | return ret; | |
| 60 | ||
| 61 | if (size == 1) | |
| 62 | *val = (data >> ((where & 3) << 3)) & 0xff; | |
| 63 | else if (size == 2) | |
| 64 | *val = (data >> ((where & 3) << 3)) & 0xffff; | |
| 65 | else | |
| 66 | *val = data; | |
| 67 | ||
| 68 | return PCIBIOS_SUCCESSFUL; | |
| 69 | } | |
| 70 | ||
| 71 | static int loongson3_pci_pcibios_write(struct pci_bus *bus, unsigned int devfn, | |
| 72 | int where, int size, u32 val) | |
| 73 | { | |
| 74 | u32 data = 0; | |
| 75 | int ret; | |
| 76 | ||
| 77 | if (size == 4) | |
| 78 | data = val; | |
| 79 | else { | |
| 80 | ret = loongson3_pci_config_access(PCI_ACCESS_READ, | |
| 81 | bus, devfn, where, &data); | |
| 82 | if (ret != PCIBIOS_SUCCESSFUL) | |
| 83 | return ret; | |
| 84 | ||
| 85 | if (size == 1) | |
| 86 | data = (data & ~(0xff << ((where & 3) << 3))) | | |
| 87 | (val << ((where & 3) << 3)); | |
| 88 | else if (size == 2) | |
| 89 | data = (data & ~(0xffff << ((where & 3) << 3))) | | |
| 90 | (val << ((where & 3) << 3)); | |
| 91 | } | |
| 92 | ||
| 93 | ret = loongson3_pci_config_access(PCI_ACCESS_WRITE, | |
| 94 | bus, devfn, where, &data); | |
| 95 | ||
| 96 | return ret; | |
| 97 | } | |
| 98 | ||
| 99 | struct pci_ops loongson_pci_ops = { | |
| 100 | .read = loongson3_pci_pcibios_read, | |
| 101 | .write = loongson3_pci_pcibios_write | |
| 102 | }; |