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26893c13 DH |
1 | /* |
2 | * leon_pci.c: LEON Host PCI support | |
3 | * | |
4 | * Copyright (C) 2011 Aeroflex Gaisler AB, Daniel Hellstrom | |
5 | * | |
6 | * Code is partially derived from pcic.c | |
7 | */ | |
8 | ||
9 | #include <linux/of_device.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/pci.h> | |
7b64db60 | 12 | #include <linux/export.h> |
26893c13 DH |
13 | #include <asm/leon.h> |
14 | #include <asm/leon_pci.h> | |
15 | ||
16 | /* The LEON architecture does not rely on a BIOS or bootloader to setup | |
17 | * PCI for us. The Linux generic routines are used to setup resources, | |
ac1edcc5 BH |
18 | * reset values of configuration-space register settings are preserved. |
19 | * | |
20 | * PCI Memory and Prefetchable Memory is direct-mapped. However I/O Space is | |
21 | * accessed through a Window which is translated to low 64KB in PCI space, the | |
22 | * first 4KB is not used so 60KB is available. | |
26893c13 DH |
23 | */ |
24 | void leon_pci_init(struct platform_device *ofdev, struct leon_pci_info *info) | |
25 | { | |
2b591616 | 26 | LIST_HEAD(resources); |
26893c13 DH |
27 | struct pci_bus *root_bus; |
28 | ||
ac1edcc5 BH |
29 | pci_add_resource_offset(&resources, &info->io_space, |
30 | info->io_space.start - 0x1000); | |
2b591616 | 31 | pci_add_resource(&resources, &info->mem_space); |
26893c13 | 32 | |
2b591616 BH |
33 | root_bus = pci_scan_root_bus(&ofdev->dev, 0, info->ops, info, |
34 | &resources); | |
35 | if (root_bus) { | |
26893c13 DH |
36 | /* Setup IRQs of all devices using custom routines */ |
37 | pci_fixup_irqs(pci_common_swizzle, info->map_irq); | |
38 | ||
39 | /* Assign devices with resources */ | |
40 | pci_assign_unassigned_resources(); | |
2b591616 BH |
41 | } else { |
42 | pci_free_resource_list(&resources); | |
26893c13 DH |
43 | } |
44 | } | |
45 | ||
7c9503b8 | 46 | void pcibios_fixup_bus(struct pci_bus *pbus) |
26893c13 | 47 | { |
26893c13 DH |
48 | struct pci_dev *dev; |
49 | int i, has_io, has_mem; | |
50 | u16 cmd; | |
51 | ||
26893c13 DH |
52 | list_for_each_entry(dev, &pbus->devices, bus_list) { |
53 | /* | |
54 | * We can not rely on that the bootloader has enabled I/O | |
55 | * or memory access to PCI devices. Instead we enable it here | |
56 | * if the device has BARs of respective type. | |
57 | */ | |
58 | has_io = has_mem = 0; | |
59 | for (i = 0; i < PCI_ROM_RESOURCE; i++) { | |
60 | unsigned long f = dev->resource[i].flags; | |
61 | if (f & IORESOURCE_IO) | |
62 | has_io = 1; | |
63 | else if (f & IORESOURCE_MEM) | |
64 | has_mem = 1; | |
65 | } | |
66 | /* ROM BARs are mapped into 32-bit memory space */ | |
67 | if (dev->resource[PCI_ROM_RESOURCE].end != 0) { | |
68 | dev->resource[PCI_ROM_RESOURCE].flags |= | |
69 | IORESOURCE_ROM_ENABLE; | |
70 | has_mem = 1; | |
71 | } | |
72 | pci_bus_read_config_word(pbus, dev->devfn, PCI_COMMAND, &cmd); | |
73 | if (has_io && !(cmd & PCI_COMMAND_IO)) { | |
74 | #ifdef CONFIG_PCI_DEBUG | |
75 | printk(KERN_INFO "LEONPCI: Enabling I/O for dev %s\n", | |
76 | pci_name(dev)); | |
77 | #endif | |
78 | cmd |= PCI_COMMAND_IO; | |
79 | pci_bus_write_config_word(pbus, dev->devfn, PCI_COMMAND, | |
80 | cmd); | |
81 | } | |
82 | if (has_mem && !(cmd & PCI_COMMAND_MEMORY)) { | |
83 | #ifdef CONFIG_PCI_DEBUG | |
84 | printk(KERN_INFO "LEONPCI: Enabling MEMORY for dev" | |
85 | "%s\n", pci_name(dev)); | |
86 | #endif | |
87 | cmd |= PCI_COMMAND_MEMORY; | |
88 | pci_bus_write_config_word(pbus, dev->devfn, PCI_COMMAND, | |
89 | cmd); | |
90 | } | |
91 | } | |
92 | } | |
93 | ||
26893c13 DH |
94 | resource_size_t pcibios_align_resource(void *data, const struct resource *res, |
95 | resource_size_t size, resource_size_t align) | |
96 | { | |
97 | return res->start; | |
98 | } | |
99 | ||
100 | int pcibios_enable_device(struct pci_dev *dev, int mask) | |
101 | { | |
102 | return pci_enable_resources(dev, mask); | |
103 | } | |
104 | ||
26893c13 DH |
105 | /* in/out routines taken from pcic.c |
106 | * | |
107 | * This probably belongs here rather than ioport.c because | |
108 | * we do not want this crud linked into SBus kernels. | |
109 | * Also, think for a moment about likes of floppy.c that | |
110 | * include architecture specific parts. They may want to redefine ins/outs. | |
111 | * | |
112 | * We do not use horrible macros here because we want to | |
113 | * advance pointer by sizeof(size). | |
114 | */ | |
115 | void outsb(unsigned long addr, const void *src, unsigned long count) | |
116 | { | |
117 | while (count) { | |
118 | count -= 1; | |
119 | outb(*(const char *)src, addr); | |
120 | src += 1; | |
121 | /* addr += 1; */ | |
122 | } | |
123 | } | |
124 | EXPORT_SYMBOL(outsb); | |
125 | ||
126 | void outsw(unsigned long addr, const void *src, unsigned long count) | |
127 | { | |
128 | while (count) { | |
129 | count -= 2; | |
130 | outw(*(const short *)src, addr); | |
131 | src += 2; | |
132 | /* addr += 2; */ | |
133 | } | |
134 | } | |
135 | EXPORT_SYMBOL(outsw); | |
136 | ||
137 | void outsl(unsigned long addr, const void *src, unsigned long count) | |
138 | { | |
139 | while (count) { | |
140 | count -= 4; | |
141 | outl(*(const long *)src, addr); | |
142 | src += 4; | |
143 | /* addr += 4; */ | |
144 | } | |
145 | } | |
146 | EXPORT_SYMBOL(outsl); | |
147 | ||
148 | void insb(unsigned long addr, void *dst, unsigned long count) | |
149 | { | |
150 | while (count) { | |
151 | count -= 1; | |
152 | *(unsigned char *)dst = inb(addr); | |
153 | dst += 1; | |
154 | /* addr += 1; */ | |
155 | } | |
156 | } | |
157 | EXPORT_SYMBOL(insb); | |
158 | ||
159 | void insw(unsigned long addr, void *dst, unsigned long count) | |
160 | { | |
161 | while (count) { | |
162 | count -= 2; | |
163 | *(unsigned short *)dst = inw(addr); | |
164 | dst += 2; | |
165 | /* addr += 2; */ | |
166 | } | |
167 | } | |
168 | EXPORT_SYMBOL(insw); | |
169 | ||
170 | void insl(unsigned long addr, void *dst, unsigned long count) | |
171 | { | |
172 | while (count) { | |
173 | count -= 4; | |
174 | /* | |
175 | * XXX I am sure we are in for an unaligned trap here. | |
176 | */ | |
177 | *(unsigned long *)dst = inl(addr); | |
178 | dst += 4; | |
179 | /* addr += 4; */ | |
180 | } | |
181 | } | |
182 | EXPORT_SYMBOL(insl); |