1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2013 Imagination Technologies 4 * Author: Paul Burton <paul.burton@mips.com> 5 */ 6 7 #include <common.h> 8 #include <msc01.h> 9 #include <pci.h> 10 #include <pci_msc01.h> 11 #include <asm/io.h> 12 13 #define PCI_ACCESS_READ 0 14 #define PCI_ACCESS_WRITE 1 15 16 struct msc01_pci_controller { 17 struct pci_controller hose; 18 void *base; 19 }; 20 21 static inline struct msc01_pci_controller * 22 hose_to_msc01(struct pci_controller *hose) 23 { 24 return container_of(hose, struct msc01_pci_controller, hose); 25 } 26 27 static int msc01_config_access(struct msc01_pci_controller *msc01, 28 unsigned char access_type, pci_dev_t bdf, 29 int where, u32 *data) 30 { 31 const u32 aborts = MSC01_PCI_INTSTAT_MA_MSK | MSC01_PCI_INTSTAT_TA_MSK; 32 void *intstat = msc01->base + MSC01_PCI_INTSTAT_OFS; 33 void *cfgdata = msc01->base + MSC01_PCI_CFGDATA_OFS; 34 unsigned int bus = PCI_BUS(bdf); 35 unsigned int dev = PCI_DEV(bdf); 36 unsigned int devfn = PCI_DEV(bdf) << 3 | PCI_FUNC(bdf); 37 38 /* clear abort status */ 39 __raw_writel(aborts, intstat); 40 41 /* setup address */ 42 __raw_writel((bus << MSC01_PCI_CFGADDR_BNUM_SHF) | 43 (dev << MSC01_PCI_CFGADDR_DNUM_SHF) | 44 (devfn << MSC01_PCI_CFGADDR_FNUM_SHF) | 45 ((where / 4) << MSC01_PCI_CFGADDR_RNUM_SHF), 46 msc01->base + MSC01_PCI_CFGADDR_OFS); 47 48 /* perform access */ 49 if (access_type == PCI_ACCESS_WRITE) 50 __raw_writel(*data, cfgdata); 51 else 52 *data = __raw_readl(cfgdata); 53 54 /* check for aborts */ 55 if (__raw_readl(intstat) & aborts) { 56 /* clear abort status */ 57 __raw_writel(aborts, intstat); 58 return -1; 59 } 60 61 return 0; 62 } 63 64 static int msc01_read_config_dword(struct pci_controller *hose, pci_dev_t dev, 65 int where, u32 *value) 66 { 67 struct msc01_pci_controller *msc01 = hose_to_msc01(hose); 68 69 *value = 0xffffffff; 70 return msc01_config_access(msc01, PCI_ACCESS_READ, dev, where, value); 71 } 72 73 static int msc01_write_config_dword(struct pci_controller *hose, pci_dev_t dev, 74 int where, u32 value) 75 { 76 struct msc01_pci_controller *gt = hose_to_msc01(hose); 77 u32 data = value; 78 79 return msc01_config_access(gt, PCI_ACCESS_WRITE, dev, where, &data); 80 } 81 82 void msc01_pci_init(void *base, unsigned long sys_bus, unsigned long sys_phys, 83 unsigned long sys_size, unsigned long mem_bus, 84 unsigned long mem_phys, unsigned long mem_size, 85 unsigned long io_bus, unsigned long io_phys, 86 unsigned long io_size) 87 { 88 static struct msc01_pci_controller global_msc01; 89 struct msc01_pci_controller *msc01; 90 struct pci_controller *hose; 91 92 msc01 = &global_msc01; 93 msc01->base = base; 94 95 hose = &msc01->hose; 96 97 hose->first_busno = 0; 98 hose->last_busno = 0; 99 100 /* System memory space */ 101 pci_set_region(&hose->regions[0], sys_bus, sys_phys, sys_size, 102 PCI_REGION_MEM | PCI_REGION_SYS_MEMORY); 103 104 /* PCI memory space */ 105 pci_set_region(&hose->regions[1], mem_bus, mem_phys, mem_size, 106 PCI_REGION_MEM); 107 108 /* PCI I/O space */ 109 pci_set_region(&hose->regions[2], io_bus, io_phys, io_size, 110 PCI_REGION_IO); 111 112 hose->region_count = 3; 113 114 pci_set_ops(hose, 115 pci_hose_read_config_byte_via_dword, 116 pci_hose_read_config_word_via_dword, 117 msc01_read_config_dword, 118 pci_hose_write_config_byte_via_dword, 119 pci_hose_write_config_word_via_dword, 120 msc01_write_config_dword); 121 122 pci_register_hose(hose); 123 hose->last_busno = pci_hose_scan(hose); 124 } 125