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 33 root_bus = pci_scan_root_bus(&ofdev->dev, 0, info->ops, info, 34 &resources); 35 if (root_bus) { 36 /* Setup IRQs of all devices using custom routines */ 37 pci_fixup_irqs(pci_common_swizzle, info->map_irq); 38 39 /* Assign devices with resources */ 40 pci_assign_unassigned_resources(); 41 } else { 42 pci_free_resource_list(&resources); 43 } 44 } 45 46 void __devinit pcibios_fixup_bus(struct pci_bus *pbus) 47 { 48 struct pci_dev *dev; 49 int i, has_io, has_mem; 50 u16 cmd; 51 52 list_for_each_entry(dev, &pbus->devices, bus_list) { 53 /* 54 * We can not rely on that the bootloader has enabled I/O 55 * or memory access to PCI devices. Instead we enable it here 56 * if the device has BARs of respective type. 57 */ 58 has_io = has_mem = 0; 59 for (i = 0; i < PCI_ROM_RESOURCE; i++) { 60 unsigned long f = dev->resource[i].flags; 61 if (f & IORESOURCE_IO) 62 has_io = 1; 63 else if (f & IORESOURCE_MEM) 64 has_mem = 1; 65 } 66 /* ROM BARs are mapped into 32-bit memory space */ 67 if (dev->resource[PCI_ROM_RESOURCE].end != 0) { 68 dev->resource[PCI_ROM_RESOURCE].flags |= 69 IORESOURCE_ROM_ENABLE; 70 has_mem = 1; 71 } 72 pci_bus_read_config_word(pbus, dev->devfn, PCI_COMMAND, &cmd); 73 if (has_io && !(cmd & PCI_COMMAND_IO)) { 74 #ifdef CONFIG_PCI_DEBUG 75 printk(KERN_INFO "LEONPCI: Enabling I/O for dev %s\n", 76 pci_name(dev)); 77 #endif 78 cmd |= PCI_COMMAND_IO; 79 pci_bus_write_config_word(pbus, dev->devfn, PCI_COMMAND, 80 cmd); 81 } 82 if (has_mem && !(cmd & PCI_COMMAND_MEMORY)) { 83 #ifdef CONFIG_PCI_DEBUG 84 printk(KERN_INFO "LEONPCI: Enabling MEMORY for dev" 85 "%s\n", pci_name(dev)); 86 #endif 87 cmd |= PCI_COMMAND_MEMORY; 88 pci_bus_write_config_word(pbus, dev->devfn, PCI_COMMAND, 89 cmd); 90 } 91 } 92 } 93 94 /* 95 * Other archs parse arguments here. 96 */ 97 char * __devinit pcibios_setup(char *str) 98 { 99 return str; 100 } 101 102 resource_size_t pcibios_align_resource(void *data, const struct resource *res, 103 resource_size_t size, resource_size_t align) 104 { 105 return res->start; 106 } 107 108 int pcibios_enable_device(struct pci_dev *dev, int mask) 109 { 110 return pci_enable_resources(dev, mask); 111 } 112 113 void __devinit pcibios_update_irq(struct pci_dev *dev, int irq) 114 { 115 #ifdef CONFIG_PCI_DEBUG 116 printk(KERN_DEBUG "LEONPCI: Assigning IRQ %02d to %s\n", irq, 117 pci_name(dev)); 118 #endif 119 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq); 120 } 121 122 /* in/out routines taken from pcic.c 123 * 124 * This probably belongs here rather than ioport.c because 125 * we do not want this crud linked into SBus kernels. 126 * Also, think for a moment about likes of floppy.c that 127 * include architecture specific parts. They may want to redefine ins/outs. 128 * 129 * We do not use horrible macros here because we want to 130 * advance pointer by sizeof(size). 131 */ 132 void outsb(unsigned long addr, const void *src, unsigned long count) 133 { 134 while (count) { 135 count -= 1; 136 outb(*(const char *)src, addr); 137 src += 1; 138 /* addr += 1; */ 139 } 140 } 141 EXPORT_SYMBOL(outsb); 142 143 void outsw(unsigned long addr, const void *src, unsigned long count) 144 { 145 while (count) { 146 count -= 2; 147 outw(*(const short *)src, addr); 148 src += 2; 149 /* addr += 2; */ 150 } 151 } 152 EXPORT_SYMBOL(outsw); 153 154 void outsl(unsigned long addr, const void *src, unsigned long count) 155 { 156 while (count) { 157 count -= 4; 158 outl(*(const long *)src, addr); 159 src += 4; 160 /* addr += 4; */ 161 } 162 } 163 EXPORT_SYMBOL(outsl); 164 165 void insb(unsigned long addr, void *dst, unsigned long count) 166 { 167 while (count) { 168 count -= 1; 169 *(unsigned char *)dst = inb(addr); 170 dst += 1; 171 /* addr += 1; */ 172 } 173 } 174 EXPORT_SYMBOL(insb); 175 176 void insw(unsigned long addr, void *dst, unsigned long count) 177 { 178 while (count) { 179 count -= 2; 180 *(unsigned short *)dst = inw(addr); 181 dst += 2; 182 /* addr += 2; */ 183 } 184 } 185 EXPORT_SYMBOL(insw); 186 187 void insl(unsigned long addr, void *dst, unsigned long count) 188 { 189 while (count) { 190 count -= 4; 191 /* 192 * XXX I am sure we are in for an unaligned trap here. 193 */ 194 *(unsigned long *)dst = inl(addr); 195 dst += 4; 196 /* addr += 4; */ 197 } 198 } 199 EXPORT_SYMBOL(insl); 200