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);
33 root_bus = pci_scan_root_bus(&ofdev->dev, 0, info->ops, info,
36 /* Setup IRQs of all devices using custom routines */
37 pci_fixup_irqs(pci_common_swizzle, info->map_irq);
39 /* Assign devices with resources */
40 pci_assign_unassigned_resources();
42 pci_free_resource_list(&resources);
46 void __devinit pcibios_fixup_bus(struct pci_bus *pbus)
49 int i, has_io, has_mem;
52 list_for_each_entry(dev, &pbus->devices, bus_list) {
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.
59 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
60 unsigned long f = dev->resource[i].flags;
61 if (f & IORESOURCE_IO)
63 else if (f & IORESOURCE_MEM)
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;
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",
78 cmd |= PCI_COMMAND_IO;
79 pci_bus_write_config_word(pbus, dev->devfn, PCI_COMMAND,
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));
87 cmd |= PCI_COMMAND_MEMORY;
88 pci_bus_write_config_word(pbus, dev->devfn, PCI_COMMAND,
95 * Other archs parse arguments here.
97 char * __devinit pcibios_setup(char *str)
102 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
103 resource_size_t size, resource_size_t align)
108 int pcibios_enable_device(struct pci_dev *dev, int mask)
110 return pci_enable_resources(dev, mask);
113 void __devinit pcibios_update_irq(struct pci_dev *dev, int irq)
115 #ifdef CONFIG_PCI_DEBUG
116 printk(KERN_DEBUG "LEONPCI: Assigning IRQ %02d to %s\n", irq,
119 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
122 /* in/out routines taken from pcic.c
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.
129 * We do not use horrible macros here because we want to
130 * advance pointer by sizeof(size).
132 void outsb(unsigned long addr, const void *src, unsigned long count)
136 outb(*(const char *)src, addr);
141 EXPORT_SYMBOL(outsb);
143 void outsw(unsigned long addr, const void *src, unsigned long count)
147 outw(*(const short *)src, addr);
152 EXPORT_SYMBOL(outsw);
154 void outsl(unsigned long addr, const void *src, unsigned long count)
158 outl(*(const long *)src, addr);
163 EXPORT_SYMBOL(outsl);
165 void insb(unsigned long addr, void *dst, unsigned long count)
169 *(unsigned char *)dst = inb(addr);
176 void insw(unsigned long addr, void *dst, unsigned long count)
180 *(unsigned short *)dst = inw(addr);
187 void insl(unsigned long addr, void *dst, unsigned long count)
192 * XXX I am sure we are in for an unaligned trap here.
194 *(unsigned long *)dst = inl(addr);