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83d290c5 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
baf37f06 PB |
2 | /* |
3 | * Copyright (C) 2013 Imagination Technologies | |
c5bf161f | 4 | * Author: Paul Burton <paul.burton@mips.com> |
baf37f06 PB |
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 | } |