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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 | // SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 1999, 2000, 2004, 2005 MIPS Technologies, Inc. * All rights reserved. * Authors: Carsten Langgaard <carstenl@mips.com> * Maciej W. Rozycki <macro@mips.com> * Copyright (C) 2005 Ralf Baechle (ralf@linux-mips.org) * * MIPS boards specific PCI support. */ #include <linux/types.h> #include <linux/pci.h> #include <linux/kernel.h> #include <asm/mips-boards/msc01_pci.h> #define PCI_ACCESS_READ 0 #define PCI_ACCESS_WRITE 1 /* * PCI configuration cycle AD bus definition */ /* Type 0 */ #define PCI_CFG_TYPE0_REG_SHF 0 #define PCI_CFG_TYPE0_FUNC_SHF 8 /* Type 1 */ #define PCI_CFG_TYPE1_REG_SHF 0 #define PCI_CFG_TYPE1_FUNC_SHF 8 #define PCI_CFG_TYPE1_DEV_SHF 11 #define PCI_CFG_TYPE1_BUS_SHF 16 static int msc_pcibios_config_access(unsigned char access_type, struct pci_bus *bus, unsigned int devfn, int where, u32 * data) { unsigned char busnum = bus->number; u32 intr; /* Clear status register bits. */ MSC_WRITE(MSC01_PCI_INTSTAT, (MSC01_PCI_INTCFG_MA_BIT | MSC01_PCI_INTCFG_TA_BIT)); MSC_WRITE(MSC01_PCI_CFGADDR, ((busnum << MSC01_PCI_CFGADDR_BNUM_SHF) | (PCI_SLOT(devfn) << MSC01_PCI_CFGADDR_DNUM_SHF) | (PCI_FUNC(devfn) << MSC01_PCI_CFGADDR_FNUM_SHF) | ((where / 4) << MSC01_PCI_CFGADDR_RNUM_SHF))); /* Perform access */ if (access_type == PCI_ACCESS_WRITE) MSC_WRITE(MSC01_PCI_CFGDATA, *data); else MSC_READ(MSC01_PCI_CFGDATA, *data); /* Detect Master/Target abort */ MSC_READ(MSC01_PCI_INTSTAT, intr); if (intr & (MSC01_PCI_INTCFG_MA_BIT | MSC01_PCI_INTCFG_TA_BIT)) { /* Error occurred */ /* Clear bits */ MSC_WRITE(MSC01_PCI_INTSTAT, (MSC01_PCI_INTCFG_MA_BIT | MSC01_PCI_INTCFG_TA_BIT)); return -1; } return 0; } /* * We can't address 8 and 16 bit words directly. Instead we have to * read/write a 32bit word and mask/modify the data we actually want. */ static int msc_pcibios_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 * val) { u32 data = 0; if ((size == 2) && (where & 1)) return PCIBIOS_BAD_REGISTER_NUMBER; else if ((size == 4) && (where & 3)) return PCIBIOS_BAD_REGISTER_NUMBER; if (msc_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where, &data)) return -1; if (size == 1) *val = (data >> ((where & 3) << 3)) & 0xff; else if (size == 2) *val = (data >> ((where & 3) << 3)) & 0xffff; else *val = data; return PCIBIOS_SUCCESSFUL; } static int msc_pcibios_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val) { u32 data = 0; if ((size == 2) && (where & 1)) return PCIBIOS_BAD_REGISTER_NUMBER; else if ((size == 4) && (where & 3)) return PCIBIOS_BAD_REGISTER_NUMBER; if (size == 4) data = val; else { if (msc_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where, &data)) return -1; if (size == 1) data = (data & ~(0xff << ((where & 3) << 3))) | (val << ((where & 3) << 3)); else if (size == 2) data = (data & ~(0xffff << ((where & 3) << 3))) | (val << ((where & 3) << 3)); } if (msc_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data)) return -1; return PCIBIOS_SUCCESSFUL; } struct pci_ops msc_pci_ops = { .read = msc_pcibios_read, .write = msc_pcibios_write }; |