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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>
12#include <linux/export.h>
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,
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.
23 */
24void leon_pci_init(struct platform_device *ofdev, struct leon_pci_info *info)
25{
26 LIST_HEAD(resources);
27 struct pci_bus *root_bus;
28
29 pci_add_resource_offset(&resources, &info->io_space,
30 info->io_space.start - 0x1000);
31 pci_add_resource(&resources, &info->mem_space);
32
33 root_bus = pci_scan_root_bus(&ofdev->dev, 0, info->ops, info,
34 &resources);
35 if (root_bus) {
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();
41 } else {
42 pci_free_resource_list(&resources);
43 }
44}
45
46void __devinit pcibios_fixup_bus(struct pci_bus *pbus)
47{
48 struct pci_dev *dev;
49 int i, has_io, has_mem;
50 u16 cmd;
51
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
94/*
95 * Other archs parse arguments here.
96 */
97char * __devinit pcibios_setup(char *str)
98{
99 return str;
100}
101
102resource_size_t pcibios_align_resource(void *data, const struct resource *res,
103 resource_size_t size, resource_size_t align)
104{
105 return res->start;
106}
107
108int pcibios_enable_device(struct pci_dev *dev, int mask)
109{
110 return pci_enable_resources(dev, mask);
111}
112
113void __devinit pcibios_update_irq(struct pci_dev *dev, int irq)
114{
115#ifdef CONFIG_PCI_DEBUG
116 printk(KERN_DEBUG "LEONPCI: Assigning IRQ %02d to %s\n", irq,
117 pci_name(dev));
118#endif
119 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
120}
121
122/* in/out routines taken from pcic.c
123 *
124 * This probably belongs here rather than ioport.c because
125 * we do not want this crud linked into SBus kernels.
126 * Also, think for a moment about likes of floppy.c that
127 * include architecture specific parts. They may want to redefine ins/outs.
128 *
129 * We do not use horrible macros here because we want to
130 * advance pointer by sizeof(size).
131 */
132void outsb(unsigned long addr, const void *src, unsigned long count)
133{
134 while (count) {
135 count -= 1;
136 outb(*(const char *)src, addr);
137 src += 1;
138 /* addr += 1; */
139 }
140}
141EXPORT_SYMBOL(outsb);
142
143void outsw(unsigned long addr, const void *src, unsigned long count)
144{
145 while (count) {
146 count -= 2;
147 outw(*(const short *)src, addr);
148 src += 2;
149 /* addr += 2; */
150 }
151}
152EXPORT_SYMBOL(outsw);
153
154void outsl(unsigned long addr, const void *src, unsigned long count)
155{
156 while (count) {
157 count -= 4;
158 outl(*(const long *)src, addr);
159 src += 4;
160 /* addr += 4; */
161 }
162}
163EXPORT_SYMBOL(outsl);
164
165void insb(unsigned long addr, void *dst, unsigned long count)
166{
167 while (count) {
168 count -= 1;
169 *(unsigned char *)dst = inb(addr);
170 dst += 1;
171 /* addr += 1; */
172 }
173}
174EXPORT_SYMBOL(insb);
175
176void insw(unsigned long addr, void *dst, unsigned long count)
177{
178 while (count) {
179 count -= 2;
180 *(unsigned short *)dst = inw(addr);
181 dst += 2;
182 /* addr += 2; */
183 }
184}
185EXPORT_SYMBOL(insw);
186
187void insl(unsigned long addr, void *dst, unsigned long count)
188{
189 while (count) {
190 count -= 4;
191 /*
192 * XXX I am sure we are in for an unaligned trap here.
193 */
194 *(unsigned long *)dst = inl(addr);
195 dst += 4;
196 /* addr += 4; */
197 }
198}
199EXPORT_SYMBOL(insl);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * leon_pci.c: LEON Host PCI support
4 *
5 * Copyright (C) 2011 Aeroflex Gaisler AB, Daniel Hellstrom
6 *
7 * Code is partially derived from pcic.c
8 */
9
10#include <linux/of_device.h>
11#include <linux/kernel.h>
12#include <linux/pci.h>
13#include <linux/export.h>
14#include <asm/leon.h>
15#include <asm/leon_pci.h>
16
17/* The LEON architecture does not rely on a BIOS or bootloader to setup
18 * PCI for us. The Linux generic routines are used to setup resources,
19 * reset values of configuration-space register settings are preserved.
20 *
21 * PCI Memory and Prefetchable Memory is direct-mapped. However I/O Space is
22 * accessed through a Window which is translated to low 64KB in PCI space, the
23 * first 4KB is not used so 60KB is available.
24 */
25void leon_pci_init(struct platform_device *ofdev, struct leon_pci_info *info)
26{
27 LIST_HEAD(resources);
28 struct pci_bus *root_bus;
29 struct pci_host_bridge *bridge;
30 int ret;
31
32 bridge = pci_alloc_host_bridge(0);
33 if (!bridge)
34 return;
35
36 pci_add_resource_offset(&resources, &info->io_space,
37 info->io_space.start - 0x1000);
38 pci_add_resource(&resources, &info->mem_space);
39 info->busn.flags = IORESOURCE_BUS;
40 pci_add_resource(&resources, &info->busn);
41
42 list_splice_init(&resources, &bridge->windows);
43 bridge->dev.parent = &ofdev->dev;
44 bridge->sysdata = info;
45 bridge->busnr = 0;
46 bridge->ops = info->ops;
47 bridge->swizzle_irq = pci_common_swizzle;
48 bridge->map_irq = info->map_irq;
49
50 ret = pci_scan_root_bus_bridge(bridge);
51 if (ret) {
52 pci_free_host_bridge(bridge);
53 return;
54 }
55
56 root_bus = bridge->bus;
57
58 /* Assign devices with resources */
59 pci_assign_unassigned_resources();
60 pci_bus_add_devices(root_bus);
61}
62
63int pcibios_enable_device(struct pci_dev *dev, int mask)
64{
65 u16 cmd, oldcmd;
66 int i;
67
68 pci_read_config_word(dev, PCI_COMMAND, &cmd);
69 oldcmd = cmd;
70
71 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
72 struct resource *res = &dev->resource[i];
73
74 /* Only set up the requested stuff */
75 if (!(mask & (1<<i)))
76 continue;
77
78 if (res->flags & IORESOURCE_IO)
79 cmd |= PCI_COMMAND_IO;
80 if (res->flags & IORESOURCE_MEM)
81 cmd |= PCI_COMMAND_MEMORY;
82 }
83
84 if (cmd != oldcmd) {
85 pci_info(dev, "enabling device (%04x -> %04x)\n", oldcmd, cmd);
86 pci_write_config_word(dev, PCI_COMMAND, cmd);
87 }
88 return 0;
89}