Merge tag 'vfio-for-v3.6-rc1' of git://github.com/awilliam/linux-vfio
[firefly-linux-kernel-4.4.55.git] / arch / sparc / kernel / leon_pci.c
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  */
24 void 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
46 void __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 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
105 void __devinit pcibios_update_irq(struct pci_dev *dev, int irq)
106 {
107 #ifdef CONFIG_PCI_DEBUG
108         printk(KERN_DEBUG "LEONPCI: Assigning IRQ %02d to %s\n", irq,
109                 pci_name(dev));
110 #endif
111         pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
112 }
113
114 /* in/out routines taken from pcic.c
115  *
116  * This probably belongs here rather than ioport.c because
117  * we do not want this crud linked into SBus kernels.
118  * Also, think for a moment about likes of floppy.c that
119  * include architecture specific parts. They may want to redefine ins/outs.
120  *
121  * We do not use horrible macros here because we want to
122  * advance pointer by sizeof(size).
123  */
124 void outsb(unsigned long addr, const void *src, unsigned long count)
125 {
126         while (count) {
127                 count -= 1;
128                 outb(*(const char *)src, addr);
129                 src += 1;
130                 /* addr += 1; */
131         }
132 }
133 EXPORT_SYMBOL(outsb);
134
135 void outsw(unsigned long addr, const void *src, unsigned long count)
136 {
137         while (count) {
138                 count -= 2;
139                 outw(*(const short *)src, addr);
140                 src += 2;
141                 /* addr += 2; */
142         }
143 }
144 EXPORT_SYMBOL(outsw);
145
146 void outsl(unsigned long addr, const void *src, unsigned long count)
147 {
148         while (count) {
149                 count -= 4;
150                 outl(*(const long *)src, addr);
151                 src += 4;
152                 /* addr += 4; */
153         }
154 }
155 EXPORT_SYMBOL(outsl);
156
157 void insb(unsigned long addr, void *dst, unsigned long count)
158 {
159         while (count) {
160                 count -= 1;
161                 *(unsigned char *)dst = inb(addr);
162                 dst += 1;
163                 /* addr += 1; */
164         }
165 }
166 EXPORT_SYMBOL(insb);
167
168 void insw(unsigned long addr, void *dst, unsigned long count)
169 {
170         while (count) {
171                 count -= 2;
172                 *(unsigned short *)dst = inw(addr);
173                 dst += 2;
174                 /* addr += 2; */
175         }
176 }
177 EXPORT_SYMBOL(insw);
178
179 void insl(unsigned long addr, void *dst, unsigned long count)
180 {
181         while (count) {
182                 count -= 4;
183                 /*
184                  * XXX I am sure we are in for an unaligned trap here.
185                  */
186                 *(unsigned long *)dst = inl(addr);
187                 dst += 4;
188                 /* addr += 4; */
189         }
190 }
191 EXPORT_SYMBOL(insl);