summaryrefslogtreecommitdiffstats
path: root/arch/sparc/kernel/leon_pci.c
blob: a8a9a275037d1bb6ede006148af3f5c266d9d44e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
/*
 * leon_pci.c: LEON Host PCI support
 *
 * Copyright (C) 2011 Aeroflex Gaisler AB, Daniel Hellstrom
 *
 * Code is partially derived from pcic.c
 */

#include <linux/of_device.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <asm/leon.h>
#include <asm/leon_pci.h>

/* The LEON architecture does not rely on a BIOS or bootloader to setup
 * PCI for us. The Linux generic routines are used to setup resources,
 * reset values of confuration-space registers settings ae preseved.
 */
void leon_pci_init(struct platform_device *ofdev, struct leon_pci_info *info)
{
	struct pci_bus *root_bus;

	root_bus = pci_scan_bus_parented(&ofdev->dev, 0, info->ops, info);
	if (root_bus) {
		root_bus->resource[0] = &info->io_space;
		root_bus->resource[1] = &info->mem_space;
		root_bus->resource[2] = NULL;

		/* Init all PCI devices into PCI tree */
		pci_bus_add_devices(root_bus);

		/* Setup IRQs of all devices using custom routines */
		pci_fixup_irqs(pci_common_swizzle, info->map_irq);

		/* Assign devices with resources */
		pci_assign_unassigned_resources();
	}
}

/* PCI Memory and Prefetchable Memory is direct-mapped. However I/O Space is
 * accessed through a Window which is translated to low 64KB in PCI space, the
 * first 4KB is not used so 60KB is available.
 *
 * This function is used by generic code to translate resource addresses into
 * PCI addresses.
 */
void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
			     struct resource *res)
{
	struct leon_pci_info *info = dev->bus->sysdata;

	region->start = res->start;
	region->end = res->end;

	if (res->flags & IORESOURCE_IO) {
		region->start -= (info->io_space.start - 0x1000);
		region->end -= (info->io_space.start - 0x1000);
	}
}
EXPORT_SYMBOL(pcibios_resource_to_bus);

/* see pcibios_resource_to_bus() comment */
void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
			     struct pci_bus_region *region)
{
	struct leon_pci_info *info = dev->bus->sysdata;

	res->start = region->start;
	res->end = region->end;

	if (res->flags & IORESOURCE_IO) {
		res->start += (info->io_space.start - 0x1000);
		res->end += (info->io_space.start - 0x1000);
	}
}
EXPORT_SYMBOL(pcibios_bus_to_resource);

void __devinit pcibios_fixup_bus(struct pci_bus *pbus)
{
	struct leon_pci_info *info = pbus->sysdata;
	struct pci_dev *dev;
	int i, has_io, has_mem;
	u16 cmd;

	/* Generic PCI bus probing sets these to point at
	 * &io{port,mem}_resouce which is wrong for us.
	 */
	if (pbus->self == NULL) {
		pbus->resource[0] = &info->io_space;
		pbus->resource[1] = &info->mem_space;
		pbus->resource[2] = NULL;
	}

	list_for_each_entry(dev, &pbus->devices, bus_list) {
		/*
		 * We can not rely on that the bootloader has enabled I/O
		 * or memory access to PCI devices. Instead we enable it here
		 * if the device has BARs of respective type.
		 */
		has_io = has_mem = 0;
		for (i = 0; i < PCI_ROM_RESOURCE; i++) {
			unsigned long f = dev->resource[i].flags;
			if (f & IORESOURCE_IO)
				has_io = 1;
			else if (f & IORESOURCE_MEM)
				has_mem = 1;
		}
		/* ROM BARs are mapped into 32-bit memory space */
		if (dev->resource[PCI_ROM_RESOURCE].end != 0) {
			dev->resource[PCI_ROM_RESOURCE].flags |=
							IORESOURCE_ROM_ENABLE;
			has_mem = 1;
		}
		pci_bus_read_config_word(pbus, dev->devfn, PCI_COMMAND, &cmd);
		if (has_io && !(cmd & PCI_COMMAND_IO)) {
#ifdef CONFIG_PCI_DEBUG
			printk(KERN_INFO "LEONPCI: Enabling I/O for dev %s\n",
					 pci_name(dev));
#endif
			cmd |= PCI_COMMAND_IO;
			pci_bus_write_config_word(pbus, dev->devfn, PCI_COMMAND,
									cmd);
		}
		if (has_mem && !(cmd & PCI_COMMAND_MEMORY)) {
#ifdef CONFIG_PCI_DEBUG
			printk(KERN_INFO "LEONPCI: Enabling MEMORY for dev"
					 "%s\n", pci_name(dev));
#endif
			cmd |= PCI_COMMAND_MEMORY;
			pci_bus_write_config_word(pbus, dev->devfn, PCI_COMMAND,
									cmd);
		}
	}
}

/*
 * Other archs parse arguments here.
 */
char * __devinit pcibios_setup(char *str)
{
	return str;
}

resource_size_t pcibios_align_resource(void *data, const struct resource *res,
				resource_size_t size, resource_size_t align)
{
	return res->start;
}

int pcibios_enable_device(struct pci_dev *dev, int mask)
{
	return pci_enable_resources(dev, mask);
}

struct device_node *pci_device_to_OF_node(struct pci_dev *pdev)
{
	/*
	 * Currently the OpenBoot nodes are not connected with the PCI device,
	 * this is because the LEON PROM does not create PCI nodes. Eventually
	 * this will change and the same approach as pcic.c can be used to
	 * match PROM nodes with pci devices.
	 */
	return NULL;
}
EXPORT_SYMBOL(pci_device_to_OF_node);

void __devinit pcibios_update_irq(struct pci_dev *dev, int irq)
{
#ifdef CONFIG_PCI_DEBUG
	printk(KERN_DEBUG "LEONPCI: Assigning IRQ %02d to %s\n", irq,
		pci_name(dev));
#endif
	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
}

/* in/out routines taken from pcic.c
 *
 * This probably belongs here rather than ioport.c because
 * we do not want this crud linked into SBus kernels.
 * Also, think for a moment about likes of floppy.c that
 * include architecture specific parts. They may want to redefine ins/outs.
 *
 * We do not use horrible macros here because we want to
 * advance pointer by sizeof(size).
 */
void outsb(unsigned long addr, const void *src, unsigned long count)
{
	while (count) {
		count -= 1;
		outb(*(const char *)src, addr);
		src += 1;
		/* addr += 1; */
	}
}
EXPORT_SYMBOL(outsb);

void outsw(unsigned long addr, const void *src, unsigned long count)
{
	while (count) {
		count -= 2;
		outw(*(const short *)src, addr);
		src += 2;
		/* addr += 2; */
	}
}
EXPORT_SYMBOL(outsw);

void outsl(unsigned long addr, const void *src, unsigned long count)
{
	while (count) {
		count -= 4;
		outl(*(const long *)src, addr);
		src += 4;
		/* addr += 4; */
	}
}
EXPORT_SYMBOL(outsl);

void insb(unsigned long addr, void *dst, unsigned long count)
{
	while (count) {
		count -= 1;
		*(unsigned char *)dst = inb(addr);
		dst += 1;
		/* addr += 1; */
	}
}
EXPORT_SYMBOL(insb);

void insw(unsigned long addr, void *dst, unsigned long count)
{
	while (count) {
		count -= 2;
		*(unsigned short *)dst = inw(addr);
		dst += 2;
		/* addr += 2; */
	}
}
EXPORT_SYMBOL(insw);

void insl(unsigned long addr, void *dst, unsigned long count)
{
	while (count) {
		count -= 4;
		/*
		 * XXX I am sure we are in for an unaligned trap here.
		 */
		*(unsigned long *)dst = inl(addr);
		dst += 4;
		/* addr += 4; */
	}
}
EXPORT_SYMBOL(insl);