| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 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 | }; |