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> 12 #include <linux/export.h> 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, 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. 23 */ 24 void leon_pci_init(struct platform_device *ofdev, struct leon_pci_info *info) 25 { 26 LIST_HEAD(resources); 27 struct pci_bus *root_bus; 28 29 pci_add_resource_offset(&resources, &info->io_space, 30 info->io_space.start - 0x1000); 31 pci_add_resource(&resources, &info->mem_space); 32 info->busn.flags = IORESOURCE_BUS; 33 pci_add_resource(&resources, &info->busn); 34 35 root_bus = pci_scan_root_bus(&ofdev->dev, 0, info->ops, info, 36 &resources); 37 if (root_bus) { 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(); 43 } else { 44 pci_free_resource_list(&resources); 45 } 46 } 47 48 void pcibios_fixup_bus(struct pci_bus *pbus) 49 { 50 struct pci_dev *dev; 51 int i, has_io, has_mem; 52 u16 cmd; 53 54 list_for_each_entry(dev, &pbus->devices, bus_list) { 55 /* 56 * We can not rely on that the bootloader has enabled I/O 57 * or memory access to PCI devices. Instead we enable it here 58 * if the device has BARs of respective type. 59 */ 60 has_io = has_mem = 0; 61 for (i = 0; i < PCI_ROM_RESOURCE; i++) { 62 unsigned long f = dev->resource[i].flags; 63 if (f & IORESOURCE_IO) 64 has_io = 1; 65 else if (f & IORESOURCE_MEM) 66 has_mem = 1; 67 } 68 /* ROM BARs are mapped into 32-bit memory space */ 69 if (dev->resource[PCI_ROM_RESOURCE].end != 0) { 70 dev->resource[PCI_ROM_RESOURCE].flags |= 71 IORESOURCE_ROM_ENABLE; 72 has_mem = 1; 73 } 74 pci_bus_read_config_word(pbus, dev->devfn, PCI_COMMAND, &cmd); 75 if (has_io && !(cmd & PCI_COMMAND_IO)) { 76 #ifdef CONFIG_PCI_DEBUG 77 printk(KERN_INFO "LEONPCI: Enabling I/O for dev %s\n", 78 pci_name(dev)); 79 #endif 80 cmd |= PCI_COMMAND_IO; 81 pci_bus_write_config_word(pbus, dev->devfn, PCI_COMMAND, 82 cmd); 83 } 84 if (has_mem && !(cmd & PCI_COMMAND_MEMORY)) { 85 #ifdef CONFIG_PCI_DEBUG 86 printk(KERN_INFO "LEONPCI: Enabling MEMORY for dev" 87 "%s\n", pci_name(dev)); 88 #endif 89 cmd |= PCI_COMMAND_MEMORY; 90 pci_bus_write_config_word(pbus, dev->devfn, PCI_COMMAND, 91 cmd); 92 } 93 } 94 } 95 96 resource_size_t pcibios_align_resource(void *data, const struct resource *res, 97 resource_size_t size, resource_size_t align) 98 { 99 return res->start; 100 } 101 102 /* in/out routines taken from pcic.c 103 * 104 * This probably belongs here rather than ioport.c because 105 * we do not want this crud linked into SBus kernels. 106 * Also, think for a moment about likes of floppy.c that 107 * include architecture specific parts. They may want to redefine ins/outs. 108 * 109 * We do not use horrible macros here because we want to 110 * advance pointer by sizeof(size). 111 */ 112 void outsb(unsigned long addr, const void *src, unsigned long count) 113 { 114 while (count) { 115 count -= 1; 116 outb(*(const char *)src, addr); 117 src += 1; 118 /* addr += 1; */ 119 } 120 } 121 EXPORT_SYMBOL(outsb); 122 123 void outsw(unsigned long addr, const void *src, unsigned long count) 124 { 125 while (count) { 126 count -= 2; 127 outw(*(const short *)src, addr); 128 src += 2; 129 /* addr += 2; */ 130 } 131 } 132 EXPORT_SYMBOL(outsw); 133 134 void outsl(unsigned long addr, const void *src, unsigned long count) 135 { 136 while (count) { 137 count -= 4; 138 outl(*(const long *)src, addr); 139 src += 4; 140 /* addr += 4; */ 141 } 142 } 143 EXPORT_SYMBOL(outsl); 144 145 void insb(unsigned long addr, void *dst, unsigned long count) 146 { 147 while (count) { 148 count -= 1; 149 *(unsigned char *)dst = inb(addr); 150 dst += 1; 151 /* addr += 1; */ 152 } 153 } 154 EXPORT_SYMBOL(insb); 155 156 void insw(unsigned long addr, void *dst, unsigned long count) 157 { 158 while (count) { 159 count -= 2; 160 *(unsigned short *)dst = inw(addr); 161 dst += 2; 162 /* addr += 2; */ 163 } 164 } 165 EXPORT_SYMBOL(insw); 166 167 void insl(unsigned long addr, void *dst, unsigned long count) 168 { 169 while (count) { 170 count -= 4; 171 /* 172 * XXX I am sure we are in for an unaligned trap here. 173 */ 174 *(unsigned long *)dst = inl(addr); 175 dst += 4; 176 /* addr += 4; */ 177 } 178 } 179 EXPORT_SYMBOL(insl); 180