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83d290c5 | 1 | // SPDX-License-Identifier: GPL-2.0 |
feaa6066 GJ |
2 | /* |
3 | * Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org> | |
4 | * | |
5 | * Based on the Linux implementation. | |
6 | * Copyright (C) 1999, 2000, 2004 MIPS Technologies, Inc. | |
7 | * Authors: Carsten Langgaard <carstenl@mips.com> | |
8 | * Maciej W. Rozycki <macro@mips.com> | |
feaa6066 GJ |
9 | */ |
10 | ||
11 | #include <common.h> | |
12 | #include <gt64120.h> | |
13 | #include <pci.h> | |
14 | #include <pci_gt64120.h> | |
15 | ||
16 | #include <asm/io.h> | |
17 | ||
18 | #define PCI_ACCESS_READ 0 | |
19 | #define PCI_ACCESS_WRITE 1 | |
20 | ||
21 | struct gt64120_regs { | |
22 | u8 unused_000[0xc18]; | |
23 | u32 intrcause; | |
24 | u8 unused_c1c[0x0dc]; | |
25 | u32 pci0_cfgaddr; | |
26 | u32 pci0_cfgdata; | |
27 | }; | |
28 | ||
29 | struct gt64120_pci_controller { | |
30 | struct pci_controller hose; | |
31 | struct gt64120_regs *regs; | |
32 | }; | |
33 | ||
34 | static inline struct gt64120_pci_controller * | |
35 | hose_to_gt64120(struct pci_controller *hose) | |
36 | { | |
37 | return container_of(hose, struct gt64120_pci_controller, hose); | |
38 | } | |
39 | ||
40 | #define GT_INTRCAUSE_ABORT_BITS \ | |
41 | (GT_INTRCAUSE_MASABORT0_BIT | GT_INTRCAUSE_TARABORT0_BIT) | |
42 | ||
43 | static int gt_config_access(struct gt64120_pci_controller *gt, | |
44 | unsigned char access_type, pci_dev_t bdf, | |
45 | int where, u32 *data) | |
46 | { | |
47 | unsigned int bus = PCI_BUS(bdf); | |
48 | unsigned int dev = PCI_DEV(bdf); | |
49 | unsigned int devfn = PCI_DEV(bdf) << 3 | PCI_FUNC(bdf); | |
50 | u32 intr; | |
51 | u32 addr; | |
52 | u32 val; | |
53 | ||
54 | if (bus == 0 && dev >= 31) { | |
55 | /* Because of a bug in the galileo (for slot 31). */ | |
56 | return -1; | |
57 | } | |
58 | ||
59 | if (access_type == PCI_ACCESS_WRITE) | |
60 | debug("PCI WR %02x:%02x.%x reg:%02d data:%08x\n", | |
61 | PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), where, *data); | |
62 | ||
63 | /* Clear cause register bits */ | |
64 | writel(~GT_INTRCAUSE_ABORT_BITS, >->regs->intrcause); | |
65 | ||
66 | addr = GT_PCI0_CFGADDR_CONFIGEN_BIT; | |
67 | addr |= bus << GT_PCI0_CFGADDR_BUSNUM_SHF; | |
68 | addr |= devfn << GT_PCI0_CFGADDR_FUNCTNUM_SHF; | |
69 | addr |= (where / 4) << GT_PCI0_CFGADDR_REGNUM_SHF; | |
70 | ||
71 | /* Setup address */ | |
72 | writel(addr, >->regs->pci0_cfgaddr); | |
73 | ||
74 | if (access_type == PCI_ACCESS_WRITE) { | |
75 | if (bus == 0 && dev == 0) { | |
76 | /* | |
77 | * The Galileo system controller is acting | |
78 | * differently than other devices. | |
79 | */ | |
80 | val = *data; | |
81 | } else { | |
82 | val = cpu_to_le32(*data); | |
83 | } | |
84 | ||
85 | writel(val, >->regs->pci0_cfgdata); | |
86 | } else { | |
87 | val = readl(>->regs->pci0_cfgdata); | |
88 | ||
89 | if (bus == 0 && dev == 0) { | |
90 | /* | |
91 | * The Galileo system controller is acting | |
92 | * differently than other devices. | |
93 | */ | |
94 | *data = val; | |
95 | } else { | |
96 | *data = le32_to_cpu(val); | |
97 | } | |
98 | } | |
99 | ||
100 | /* Check for master or target abort */ | |
101 | intr = readl(>->regs->intrcause); | |
102 | if (intr & GT_INTRCAUSE_ABORT_BITS) { | |
103 | /* Error occurred, clear abort bits */ | |
104 | writel(~GT_INTRCAUSE_ABORT_BITS, >->regs->intrcause); | |
105 | return -1; | |
106 | } | |
107 | ||
108 | if (access_type == PCI_ACCESS_READ) | |
109 | debug("PCI RD %02x:%02x.%x reg:%02d data:%08x\n", | |
110 | PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), where, *data); | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | static int gt_read_config_dword(struct pci_controller *hose, pci_dev_t dev, | |
116 | int where, u32 *value) | |
117 | { | |
118 | struct gt64120_pci_controller *gt = hose_to_gt64120(hose); | |
119 | ||
120 | *value = 0xffffffff; | |
121 | return gt_config_access(gt, PCI_ACCESS_READ, dev, where, value); | |
122 | } | |
123 | ||
124 | static int gt_write_config_dword(struct pci_controller *hose, pci_dev_t dev, | |
125 | int where, u32 value) | |
126 | { | |
127 | struct gt64120_pci_controller *gt = hose_to_gt64120(hose); | |
128 | u32 data = value; | |
129 | ||
130 | return gt_config_access(gt, PCI_ACCESS_WRITE, dev, where, &data); | |
131 | } | |
132 | ||
133 | void gt64120_pci_init(void *regs, unsigned long sys_bus, unsigned long sys_phys, | |
134 | unsigned long sys_size, unsigned long mem_bus, | |
135 | unsigned long mem_phys, unsigned long mem_size, | |
136 | unsigned long io_bus, unsigned long io_phys, | |
137 | unsigned long io_size) | |
138 | { | |
139 | static struct gt64120_pci_controller global_gt; | |
140 | struct gt64120_pci_controller *gt; | |
141 | struct pci_controller *hose; | |
142 | ||
143 | gt = &global_gt; | |
144 | gt->regs = regs; | |
145 | ||
146 | hose = >->hose; | |
147 | ||
148 | hose->first_busno = 0; | |
149 | hose->last_busno = 0; | |
150 | ||
151 | /* System memory space */ | |
152 | pci_set_region(&hose->regions[0], sys_bus, sys_phys, sys_size, | |
153 | PCI_REGION_MEM | PCI_REGION_SYS_MEMORY); | |
154 | ||
155 | /* PCI memory space */ | |
156 | pci_set_region(&hose->regions[1], mem_bus, mem_phys, mem_size, | |
157 | PCI_REGION_MEM); | |
158 | ||
159 | /* PCI I/O space */ | |
160 | pci_set_region(&hose->regions[2], io_bus, io_phys, io_size, | |
161 | PCI_REGION_IO); | |
162 | ||
163 | hose->region_count = 3; | |
164 | ||
165 | pci_set_ops(hose, | |
166 | pci_hose_read_config_byte_via_dword, | |
167 | pci_hose_read_config_word_via_dword, | |
168 | gt_read_config_dword, | |
169 | pci_hose_write_config_byte_via_dword, | |
170 | pci_hose_write_config_word_via_dword, | |
171 | gt_write_config_dword); | |
172 | ||
173 | pci_register_hose(hose); | |
174 | hose->last_busno = pci_hose_scan(hose); | |
175 | } |