2 * leon_pci.c: LEON Host PCI support
4 * Copyright (C) 2011 Aeroflex Gaisler AB, Daniel Hellstrom
6 * Code is partially derived from pcic.c
9 #include <linux/of_device.h>
10 #include <linux/kernel.h>
11 #include <linux/pci.h>
12 #include <linux/export.h>
14 #include <asm/leon_pci.h>
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.
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.
24 void leon_pci_init(struct platform_device
*ofdev
, struct leon_pci_info
*info
)
27 struct pci_bus
*root_bus
;
29 pci_add_resource_offset(&resources
, &info
->io_space
,
30 info
->io_space
.start
- 0x1000);
31 pci_add_resource(&resources
, &info
->mem_space
);
32 info
->busn
.flags
= IORESOURCE_BUS
;
33 pci_add_resource(&resources
, &info
->busn
);
35 root_bus
= pci_scan_root_bus(&ofdev
->dev
, 0, info
->ops
, info
,
38 /* Setup IRQs of all devices using custom routines */
39 pci_fixup_irqs(pci_common_swizzle
, info
->map_irq
);
41 /* Assign devices with resources */
42 pci_assign_unassigned_resources();
44 pci_free_resource_list(&resources
);
48 void pcibios_fixup_bus(struct pci_bus
*pbus
)
51 int i
, has_io
, has_mem
;
54 list_for_each_entry(dev
, &pbus
->devices
, bus_list
) {
56 * We can not rely on that the bootloader has enabled I/O
57 * or memory access to PCI devices. Instead we enable it here
58 * if the device has BARs of respective type.
61 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
62 unsigned long f
= dev
->resource
[i
].flags
;
63 if (f
& IORESOURCE_IO
)
65 else if (f
& IORESOURCE_MEM
)
68 /* ROM BARs are mapped into 32-bit memory space */
69 if (dev
->resource
[PCI_ROM_RESOURCE
].end
!= 0) {
70 dev
->resource
[PCI_ROM_RESOURCE
].flags
|=
71 IORESOURCE_ROM_ENABLE
;
74 pci_bus_read_config_word(pbus
, dev
->devfn
, PCI_COMMAND
, &cmd
);
75 if (has_io
&& !(cmd
& PCI_COMMAND_IO
)) {
76 #ifdef CONFIG_PCI_DEBUG
77 printk(KERN_INFO
"LEONPCI: Enabling I/O for dev %s\n",
80 cmd
|= PCI_COMMAND_IO
;
81 pci_bus_write_config_word(pbus
, dev
->devfn
, PCI_COMMAND
,
84 if (has_mem
&& !(cmd
& PCI_COMMAND_MEMORY
)) {
85 #ifdef CONFIG_PCI_DEBUG
86 printk(KERN_INFO
"LEONPCI: Enabling MEMORY for dev"
87 "%s\n", pci_name(dev
));
89 cmd
|= PCI_COMMAND_MEMORY
;
90 pci_bus_write_config_word(pbus
, dev
->devfn
, PCI_COMMAND
,
96 resource_size_t
pcibios_align_resource(void *data
, const struct resource
*res
,
97 resource_size_t size
, resource_size_t align
)
102 int pcibios_enable_device(struct pci_dev
*dev
, int mask
)
104 return pci_enable_resources(dev
, mask
);
107 /* in/out routines taken from pcic.c
109 * This probably belongs here rather than ioport.c because
110 * we do not want this crud linked into SBus kernels.
111 * Also, think for a moment about likes of floppy.c that
112 * include architecture specific parts. They may want to redefine ins/outs.
114 * We do not use horrible macros here because we want to
115 * advance pointer by sizeof(size).
117 void outsb(unsigned long addr
, const void *src
, unsigned long count
)
121 outb(*(const char *)src
, addr
);
126 EXPORT_SYMBOL(outsb
);
128 void outsw(unsigned long addr
, const void *src
, unsigned long count
)
132 outw(*(const short *)src
, addr
);
137 EXPORT_SYMBOL(outsw
);
139 void outsl(unsigned long addr
, const void *src
, unsigned long count
)
143 outl(*(const long *)src
, addr
);
148 EXPORT_SYMBOL(outsl
);
150 void insb(unsigned long addr
, void *dst
, unsigned long count
)
154 *(unsigned char *)dst
= inb(addr
);
161 void insw(unsigned long addr
, void *dst
, unsigned long count
)
165 *(unsigned short *)dst
= inw(addr
);
172 void insl(unsigned long addr
, void *dst
, unsigned long count
)
177 * XXX I am sure we are in for an unaligned trap here.
179 *(unsigned long *)dst
= inl(addr
);