sparc32,leon: added LEON-common low-level PCI routines
The LEON architecture does not have a BIOS or bootloader that initializes PCI for us, instead Linux generic PCI layer is used to set up resources and IRQ. Signed-off-by: Daniel Hellstrom <daniel@gaisler.com> Signed-off-by: David S. Miller <davem@davemloft.net>hifive-unleashed-5.1
Daniel Hellstrom
David S. Miller
parent
cfe3af5dde
commit
26893c1368
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@ -533,6 +533,11 @@ config PCIC_PCI
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depends on PCI && !SPARC_LEON
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default y
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config LEON_PCI
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bool
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depends on PCI && SPARC_LEON
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default y
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source "drivers/pci/Kconfig"
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source "drivers/pcmcia/Kconfig"
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@ -0,0 +1,21 @@
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/*
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* asm/leon_pci.h
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*
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* Copyright (C) 2011 Aeroflex Gaisler AB, Daniel Hellstrom
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*/
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#ifndef _ASM_LEON_PCI_H_
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#define _ASM_LEON_PCI_H_
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/* PCI related definitions */
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struct leon_pci_info {
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struct pci_ops *ops;
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struct resource io_space;
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struct resource mem_space;
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int (*map_irq)(struct pci_dev *dev, u8 slot, u8 pin);
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};
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extern void leon_pci_init(struct platform_device *ofdev,
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struct leon_pci_info *info);
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#endif /* _ASM_LEON_PCI_H_ */
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@ -47,7 +47,31 @@ extern struct device_node *pci_device_to_OF_node(struct pci_dev *pdev);
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#endif /* __KERNEL__ */
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#ifndef CONFIG_LEON_PCI
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/* generic pci stuff */
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#include <asm-generic/pci.h>
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#else
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/*
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* On LEON PCI Memory space is mapped 1:1 with physical address space.
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*
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* I/O space is located at low 64Kbytes in PCI I/O space. The I/O addresses
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* are converted into CPU addresses to virtual addresses that are mapped with
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* MMU to the PCI Host PCI I/O space window which are translated to the low
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* 64Kbytes by the Host controller.
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*/
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extern void
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pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
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struct resource *res);
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extern void
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pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
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struct pci_bus_region *region);
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static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
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{
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return PCI_IRQ_NONE;
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}
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#endif
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#endif /* __SPARC_PCI_H */
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@ -74,6 +74,7 @@ obj-$(CONFIG_SPARC64_SMP) += cpumap.o
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obj-y += dma.o
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obj-$(CONFIG_PCIC_PCI) += pcic.o
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obj-$(CONFIG_LEON_PCI) += leon_pci.o
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obj-$(CONFIG_SMP) += trampoline_$(BITS).o smp_$(BITS).o
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obj-$(CONFIG_SPARC32_SMP) += sun4m_smp.o sun4d_smp.o leon_smp.o
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@ -0,0 +1,253 @@
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/*
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* leon_pci.c: LEON Host PCI support
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*
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* Copyright (C) 2011 Aeroflex Gaisler AB, Daniel Hellstrom
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*
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* Code is partially derived from pcic.c
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*/
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#include <linux/of_device.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <asm/leon.h>
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#include <asm/leon_pci.h>
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/* The LEON architecture does not rely on a BIOS or bootloader to setup
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* PCI for us. The Linux generic routines are used to setup resources,
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* reset values of confuration-space registers settings ae preseved.
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*/
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void leon_pci_init(struct platform_device *ofdev, struct leon_pci_info *info)
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{
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struct pci_bus *root_bus;
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root_bus = pci_scan_bus_parented(&ofdev->dev, 0, info->ops, info);
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if (root_bus) {
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root_bus->resource[0] = &info->io_space;
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root_bus->resource[1] = &info->mem_space;
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root_bus->resource[2] = NULL;
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/* Init all PCI devices into PCI tree */
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pci_bus_add_devices(root_bus);
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/* Setup IRQs of all devices using custom routines */
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pci_fixup_irqs(pci_common_swizzle, info->map_irq);
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/* Assign devices with resources */
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pci_assign_unassigned_resources();
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}
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}
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/* PCI Memory and Prefetchable Memory is direct-mapped. However I/O Space is
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* accessed through a Window which is translated to low 64KB in PCI space, the
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* first 4KB is not used so 60KB is available.
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*
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* This function is used by generic code to translate resource addresses into
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* PCI addresses.
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*/
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void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
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struct resource *res)
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{
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struct leon_pci_info *info = dev->bus->sysdata;
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region->start = res->start;
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region->end = res->end;
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if (res->flags & IORESOURCE_IO) {
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region->start -= (info->io_space.start - 0x1000);
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region->end -= (info->io_space.start - 0x1000);
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}
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}
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EXPORT_SYMBOL(pcibios_resource_to_bus);
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/* see pcibios_resource_to_bus() comment */
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void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
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struct pci_bus_region *region)
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{
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struct leon_pci_info *info = dev->bus->sysdata;
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res->start = region->start;
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res->end = region->end;
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if (res->flags & IORESOURCE_IO) {
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res->start += (info->io_space.start - 0x1000);
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res->end += (info->io_space.start - 0x1000);
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}
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}
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EXPORT_SYMBOL(pcibios_bus_to_resource);
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void __devinit pcibios_fixup_bus(struct pci_bus *pbus)
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{
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struct leon_pci_info *info = pbus->sysdata;
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struct pci_dev *dev;
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int i, has_io, has_mem;
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u16 cmd;
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/* Generic PCI bus probing sets these to point at
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* &io{port,mem}_resouce which is wrong for us.
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*/
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if (pbus->self == NULL) {
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pbus->resource[0] = &info->io_space;
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pbus->resource[1] = &info->mem_space;
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pbus->resource[2] = NULL;
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}
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list_for_each_entry(dev, &pbus->devices, bus_list) {
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/*
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* We can not rely on that the bootloader has enabled I/O
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* or memory access to PCI devices. Instead we enable it here
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* if the device has BARs of respective type.
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*/
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has_io = has_mem = 0;
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for (i = 0; i < PCI_ROM_RESOURCE; i++) {
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unsigned long f = dev->resource[i].flags;
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if (f & IORESOURCE_IO)
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has_io = 1;
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else if (f & IORESOURCE_MEM)
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has_mem = 1;
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}
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/* ROM BARs are mapped into 32-bit memory space */
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if (dev->resource[PCI_ROM_RESOURCE].end != 0) {
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dev->resource[PCI_ROM_RESOURCE].flags |=
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IORESOURCE_ROM_ENABLE;
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has_mem = 1;
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}
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pci_bus_read_config_word(pbus, dev->devfn, PCI_COMMAND, &cmd);
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if (has_io && !(cmd & PCI_COMMAND_IO)) {
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#ifdef CONFIG_PCI_DEBUG
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printk(KERN_INFO "LEONPCI: Enabling I/O for dev %s\n",
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pci_name(dev));
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#endif
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cmd |= PCI_COMMAND_IO;
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pci_bus_write_config_word(pbus, dev->devfn, PCI_COMMAND,
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cmd);
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}
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if (has_mem && !(cmd & PCI_COMMAND_MEMORY)) {
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#ifdef CONFIG_PCI_DEBUG
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printk(KERN_INFO "LEONPCI: Enabling MEMORY for dev"
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"%s\n", pci_name(dev));
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#endif
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cmd |= PCI_COMMAND_MEMORY;
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pci_bus_write_config_word(pbus, dev->devfn, PCI_COMMAND,
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cmd);
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}
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}
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}
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/*
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* Other archs parse arguments here.
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*/
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char * __devinit pcibios_setup(char *str)
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{
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return str;
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}
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resource_size_t pcibios_align_resource(void *data, const struct resource *res,
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resource_size_t size, resource_size_t align)
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{
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return res->start;
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}
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int pcibios_enable_device(struct pci_dev *dev, int mask)
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{
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return pci_enable_resources(dev, mask);
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}
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struct device_node *pci_device_to_OF_node(struct pci_dev *pdev)
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{
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/*
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* Currently the OpenBoot nodes are not connected with the PCI device,
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* this is because the LEON PROM does not create PCI nodes. Eventually
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* this will change and the same approach as pcic.c can be used to
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* match PROM nodes with pci devices.
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*/
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return NULL;
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}
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EXPORT_SYMBOL(pci_device_to_OF_node);
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void __devinit pcibios_update_irq(struct pci_dev *dev, int irq)
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{
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#ifdef CONFIG_PCI_DEBUG
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printk(KERN_DEBUG "LEONPCI: Assigning IRQ %02d to %s\n", irq,
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pci_name(dev));
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#endif
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pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
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}
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/* in/out routines taken from pcic.c
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*
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* This probably belongs here rather than ioport.c because
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* we do not want this crud linked into SBus kernels.
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* Also, think for a moment about likes of floppy.c that
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* include architecture specific parts. They may want to redefine ins/outs.
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*
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* We do not use horrible macros here because we want to
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* advance pointer by sizeof(size).
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*/
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void outsb(unsigned long addr, const void *src, unsigned long count)
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{
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while (count) {
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count -= 1;
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outb(*(const char *)src, addr);
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src += 1;
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/* addr += 1; */
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}
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}
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EXPORT_SYMBOL(outsb);
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void outsw(unsigned long addr, const void *src, unsigned long count)
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{
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while (count) {
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count -= 2;
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outw(*(const short *)src, addr);
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src += 2;
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/* addr += 2; */
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}
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}
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EXPORT_SYMBOL(outsw);
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void outsl(unsigned long addr, const void *src, unsigned long count)
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{
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while (count) {
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count -= 4;
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outl(*(const long *)src, addr);
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src += 4;
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/* addr += 4; */
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}
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}
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EXPORT_SYMBOL(outsl);
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void insb(unsigned long addr, void *dst, unsigned long count)
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{
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while (count) {
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count -= 1;
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*(unsigned char *)dst = inb(addr);
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dst += 1;
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/* addr += 1; */
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}
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}
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EXPORT_SYMBOL(insb);
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void insw(unsigned long addr, void *dst, unsigned long count)
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{
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while (count) {
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count -= 2;
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*(unsigned short *)dst = inw(addr);
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dst += 2;
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/* addr += 2; */
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}
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}
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EXPORT_SYMBOL(insw);
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void insl(unsigned long addr, void *dst, unsigned long count)
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{
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while (count) {
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count -= 4;
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/*
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* XXX I am sure we are in for an unaligned trap here.
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*/
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*(unsigned long *)dst = inl(addr);
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dst += 4;
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/* addr += 4; */
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}
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}
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EXPORT_SYMBOL(insl);
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@ -51,6 +51,7 @@ obj-$(CONFIG_X86_VISWS) += setup-irq.o
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obj-$(CONFIG_MN10300) += setup-bus.o
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obj-$(CONFIG_MICROBLAZE) += setup-bus.o
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obj-$(CONFIG_TILE) += setup-bus.o setup-irq.o
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obj-$(CONFIG_SPARC_LEON) += setup-bus.o setup-irq.o
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#
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# ACPI Related PCI FW Functions
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