/*
* 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 <linux/export.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)
{
LIST_HEAD(resources);
struct pci_bus *root_bus;
pci_add_resource(&resources, &info->io_space);
pci_add_resource(&resources, &info->mem_space);
root_bus = pci_scan_root_bus(&ofdev->dev, 0, info->ops, info,
&resources);
if (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();
} else {
pci_free_resource_list(&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;
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);