projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 26893c13 DH |
1 | /* |
| 2 | * leon_pci.c: LEON Host PCI support | |
| 3 | * | |
| 4 | * Copyright (C) 2011 Aeroflex Gaisler AB, Daniel Hellstrom | |
| 5 | * | |
| 6 | * Code is partially derived from pcic.c | |
| 7 | */ | |
| 8 | ||
| 9 | #include <linux/of_device.h> | |
| 10 | #include <linux/kernel.h> | |
| 11 | #include <linux/pci.h> | |
| 7b64db60 | 12 | #include <linux/export.h> |
| 26893c13 DH |
13 | #include <asm/leon.h> |
| 14 | #include <asm/leon_pci.h> | |
| 15 | ||
| 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, | |
| ac1edcc5 BH |
18 | * reset values of configuration-space register settings are preserved. |
| 19 | * | |
| 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. | |
| 26893c13 DH |
23 | */ |
| 24 | void leon_pci_init(struct platform_device *ofdev, struct leon_pci_info *info) | |
| 25 | { | |
| 2b591616 | 26 | LIST_HEAD(resources); |
| 26893c13 DH |
27 | struct pci_bus *root_bus; |
| 28 | ||
| ac1edcc5 BH |
29 | pci_add_resource_offset(&resources, &info->io_space, |
| 30 | info->io_space.start - 0x1000); | |
| 2b591616 | 31 | pci_add_resource(&resources, &info->mem_space); |
| aa90b694 DH |
32 | info->busn.flags = IORESOURCE_BUS; |
| 33 | pci_add_resource(&resources, &info->busn); | |
| 26893c13 | 34 | |
| 2b591616 BH |
35 | root_bus = pci_scan_root_bus(&ofdev->dev, 0, info->ops, info, |
| 36 | &resources); | |
| 37 | if (root_bus) { | |
| 26893c13 DH |
38 | /* Setup IRQs of all devices using custom routines */ |
| 39 | pci_fixup_irqs(pci_common_swizzle, info->map_irq); | |
| 40 | ||
| 41 | /* Assign devices with resources */ | |
| 42 | pci_assign_unassigned_resources(); | |
| b97ea289 | 43 | pci_bus_add_devices(root_bus); |
| 2b591616 BH |
44 | } else { |
| 45 | pci_free_resource_list(&resources); | |
| 26893c13 DH |
46 | } |
| 47 | } | |
| 48 | ||
| 7c9503b8 | 49 | void pcibios_fixup_bus(struct pci_bus *pbus) |
| 26893c13 | 50 | { |
| 26893c13 DH |
51 | struct pci_dev *dev; |
| 52 | int i, has_io, has_mem; | |
| 53 | u16 cmd; | |
| 54 | ||
| 26893c13 DH |
55 | list_for_each_entry(dev, &pbus->devices, bus_list) { |
| 56 | /* | |
| 57 | * We can not rely on that the bootloader has enabled I/O | |
| 58 | * or memory access to PCI devices. Instead we enable it here | |
| 59 | * if the device has BARs of respective type. | |
| 60 | */ | |
| 61 | has_io = has_mem = 0; | |
| 62 | for (i = 0; i < PCI_ROM_RESOURCE; i++) { | |
| 63 | unsigned long f = dev->resource[i].flags; | |
| 64 | if (f & IORESOURCE_IO) | |
| 65 | has_io = 1; | |
| 66 | else if (f & IORESOURCE_MEM) | |
| 67 | has_mem = 1; | |
| 68 | } | |
| 69 | /* ROM BARs are mapped into 32-bit memory space */ | |
| 70 | if (dev->resource[PCI_ROM_RESOURCE].end != 0) { | |
| 71 | dev->resource[PCI_ROM_RESOURCE].flags |= | |
| 72 | IORESOURCE_ROM_ENABLE; | |
| 73 | has_mem = 1; | |
| 74 | } | |
| 75 | pci_bus_read_config_word(pbus, dev->devfn, PCI_COMMAND, &cmd); | |
| 76 | if (has_io && !(cmd & PCI_COMMAND_IO)) { | |
| 77 | #ifdef CONFIG_PCI_DEBUG | |
| 78 | printk(KERN_INFO "LEONPCI: Enabling I/O for dev %s\n", | |
| 79 | pci_name(dev)); | |
| 80 | #endif | |
| 81 | cmd |= PCI_COMMAND_IO; | |
| 82 | pci_bus_write_config_word(pbus, dev->devfn, PCI_COMMAND, | |
| 83 | cmd); | |
| 84 | } | |
| 85 | if (has_mem && !(cmd & PCI_COMMAND_MEMORY)) { | |
| 86 | #ifdef CONFIG_PCI_DEBUG | |
| 87 | printk(KERN_INFO "LEONPCI: Enabling MEMORY for dev" | |
| 88 | "%s\n", pci_name(dev)); | |
| 89 | #endif | |
| 90 | cmd |= PCI_COMMAND_MEMORY; | |
| 91 | pci_bus_write_config_word(pbus, dev->devfn, PCI_COMMAND, | |
| 92 | cmd); | |
| 93 | } | |
| 94 | } | |
| 95 | } | |
| 96 | ||
| 26893c13 DH |
97 | resource_size_t pcibios_align_resource(void *data, const struct resource *res, |
| 98 | resource_size_t size, resource_size_t align) | |
| 99 | { | |
| 100 | return res->start; | |
| 101 | } |