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)
48 struct leon_pci_info *info = pbus->sysdata;
50 int i, has_io, has_mem;
53 list_for_each_entry(dev, &pbus->devices, bus_list) {
55 * We can not rely on that the bootloader has enabled I/O
56 * or memory access to PCI devices. Instead we enable it here
57 * if the device has BARs of respective type.
60 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
61 unsigned long f = dev->resource[i].flags;
62 if (f & IORESOURCE_IO)
64 else if (f & IORESOURCE_MEM)
67 /* ROM BARs are mapped into 32-bit memory space */
68 if (dev->resource[PCI_ROM_RESOURCE].end != 0) {
69 dev->resource[PCI_ROM_RESOURCE].flags |=
70 IORESOURCE_ROM_ENABLE;
73 pci_bus_read_config_word(pbus, dev->devfn, PCI_COMMAND, &cmd);
74 if (has_io && !(cmd & PCI_COMMAND_IO)) {
75 #ifdef CONFIG_PCI_DEBUG
76 printk(KERN_INFO "LEONPCI: Enabling I/O for dev %s\n",
79 cmd |= PCI_COMMAND_IO;
80 pci_bus_write_config_word(pbus, dev->devfn, PCI_COMMAND,
83 if (has_mem && !(cmd & PCI_COMMAND_MEMORY)) {
84 #ifdef CONFIG_PCI_DEBUG
85 printk(KERN_INFO "LEONPCI: Enabling MEMORY for dev"
86 "%s\n", pci_name(dev));
88 cmd |= PCI_COMMAND_MEMORY;
89 pci_bus_write_config_word(pbus, dev->devfn, PCI_COMMAND,
96 * Other archs parse arguments here.
98 char * __devinit pcibios_setup(char *str)
103 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
104 resource_size_t size, resource_size_t align)
109 int pcibios_enable_device(struct pci_dev *dev, int mask)
111 return pci_enable_resources(dev, mask);
114 struct device_node *pci_device_to_OF_node(struct pci_dev *pdev)
117 * Currently the OpenBoot nodes are not connected with the PCI device,
118 * this is because the LEON PROM does not create PCI nodes. Eventually
119 * this will change and the same approach as pcic.c can be used to
120 * match PROM nodes with pci devices.
124 EXPORT_SYMBOL(pci_device_to_OF_node);
126 void __devinit pcibios_update_irq(struct pci_dev *dev, int irq)
128 #ifdef CONFIG_PCI_DEBUG
129 printk(KERN_DEBUG "LEONPCI: Assigning IRQ %02d to %s\n", irq,
132 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
135 /* in/out routines taken from pcic.c
137 * This probably belongs here rather than ioport.c because
138 * we do not want this crud linked into SBus kernels.
139 * Also, think for a moment about likes of floppy.c that
140 * include architecture specific parts. They may want to redefine ins/outs.
142 * We do not use horrible macros here because we want to
143 * advance pointer by sizeof(size).
145 void outsb(unsigned long addr, const void *src, unsigned long count)
149 outb(*(const char *)src, addr);
154 EXPORT_SYMBOL(outsb);
156 void outsw(unsigned long addr, const void *src, unsigned long count)
160 outw(*(const short *)src, addr);
165 EXPORT_SYMBOL(outsw);
167 void outsl(unsigned long addr, const void *src, unsigned long count)
171 outl(*(const long *)src, addr);
176 EXPORT_SYMBOL(outsl);
178 void insb(unsigned long addr, void *dst, unsigned long count)
182 *(unsigned char *)dst = inb(addr);
189 void insw(unsigned long addr, void *dst, unsigned long count)
193 *(unsigned short *)dst = inw(addr);
200 void insl(unsigned long addr, void *dst, unsigned long count)
205 * XXX I am sure we are in for an unaligned trap here.
207 *(unsigned long *)dst = inl(addr);