1 /* 2 * Copyright (C) 2013 Imagination Technologies 3 * Author: Paul Burton <paul.burton@mips.com> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <msc01.h> 10 #include <pci.h> 11 #include <pci_msc01.h> 12 #include <asm/io.h> 13 14 #define PCI_ACCESS_READ 0 15 #define PCI_ACCESS_WRITE 1 16 17 struct msc01_pci_controller { 18 struct pci_controller hose; 19 void *base; 20 }; 21 22 static inline struct msc01_pci_controller * 23 hose_to_msc01(struct pci_controller *hose) 24 { 25 return container_of(hose, struct msc01_pci_controller, hose); 26 } 27 28 static int msc01_config_access(struct msc01_pci_controller *msc01, 29 unsigned char access_type, pci_dev_t bdf, 30 int where, u32 *data) 31 { 32 const u32 aborts = MSC01_PCI_INTSTAT_MA_MSK | MSC01_PCI_INTSTAT_TA_MSK; 33 void *intstat = msc01->base + MSC01_PCI_INTSTAT_OFS; 34 void *cfgdata = msc01->base + MSC01_PCI_CFGDATA_OFS; 35 unsigned int bus = PCI_BUS(bdf); 36 unsigned int dev = PCI_DEV(bdf); 37 unsigned int devfn = PCI_DEV(bdf) << 3 | PCI_FUNC(bdf); 38 39 /* clear abort status */ 40 __raw_writel(aborts, intstat); 41 42 /* setup address */ 43 __raw_writel((bus << MSC01_PCI_CFGADDR_BNUM_SHF) | 44 (dev << MSC01_PCI_CFGADDR_DNUM_SHF) | 45 (devfn << MSC01_PCI_CFGADDR_FNUM_SHF) | 46 ((where / 4) << MSC01_PCI_CFGADDR_RNUM_SHF), 47 msc01->base + MSC01_PCI_CFGADDR_OFS); 48 49 /* perform access */ 50 if (access_type == PCI_ACCESS_WRITE) 51 __raw_writel(*data, cfgdata); 52 else 53 *data = __raw_readl(cfgdata); 54 55 /* check for aborts */ 56 if (__raw_readl(intstat) & aborts) { 57 /* clear abort status */ 58 __raw_writel(aborts, intstat); 59 return -1; 60 } 61 62 return 0; 63 } 64 65 static int msc01_read_config_dword(struct pci_controller *hose, pci_dev_t dev, 66 int where, u32 *value) 67 { 68 struct msc01_pci_controller *msc01 = hose_to_msc01(hose); 69 70 *value = 0xffffffff; 71 return msc01_config_access(msc01, PCI_ACCESS_READ, dev, where, value); 72 } 73 74 static int msc01_write_config_dword(struct pci_controller *hose, pci_dev_t dev, 75 int where, u32 value) 76 { 77 struct msc01_pci_controller *gt = hose_to_msc01(hose); 78 u32 data = value; 79 80 return msc01_config_access(gt, PCI_ACCESS_WRITE, dev, where, &data); 81 } 82 83 void msc01_pci_init(void *base, unsigned long sys_bus, unsigned long sys_phys, 84 unsigned long sys_size, unsigned long mem_bus, 85 unsigned long mem_phys, unsigned long mem_size, 86 unsigned long io_bus, unsigned long io_phys, 87 unsigned long io_size) 88 { 89 static struct msc01_pci_controller global_msc01; 90 struct msc01_pci_controller *msc01; 91 struct pci_controller *hose; 92 93 msc01 = &global_msc01; 94 msc01->base = base; 95 96 hose = &msc01->hose; 97 98 hose->first_busno = 0; 99 hose->last_busno = 0; 100 101 /* System memory space */ 102 pci_set_region(&hose->regions[0], sys_bus, sys_phys, sys_size, 103 PCI_REGION_MEM | PCI_REGION_SYS_MEMORY); 104 105 /* PCI memory space */ 106 pci_set_region(&hose->regions[1], mem_bus, mem_phys, mem_size, 107 PCI_REGION_MEM); 108 109 /* PCI I/O space */ 110 pci_set_region(&hose->regions[2], io_bus, io_phys, io_size, 111 PCI_REGION_IO); 112 113 hose->region_count = 3; 114 115 pci_set_ops(hose, 116 pci_hose_read_config_byte_via_dword, 117 pci_hose_read_config_word_via_dword, 118 msc01_read_config_dword, 119 pci_hose_write_config_byte_via_dword, 120 pci_hose_write_config_word_via_dword, 121 msc01_write_config_dword); 122 123 pci_register_hose(hose); 124 hose->last_busno = pci_hose_scan(hose); 125 } 126