arch/sparc/kernel/leon_pci.c

   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 confuration-space registers settings ae preseved.
  19  */
  20 void leon_pci_init(struct platform_device *ofdev, struct leon_pci_info *info)
  21 {
  22         LIST_HEAD(resources);
  23         struct pci_bus *root_bus;
  24
  25         pci_add_resource(&resources, &info->io_space);
  26         pci_add_resource(&resources, &info->mem_space);
  27
  28         root_bus = pci_scan_root_bus(&ofdev->dev, 0, info->ops, info,
  29                                      &resources);
  30         if (root_bus) {
  31                 /* Setup IRQs of all devices using custom routines */
  32                 pci_fixup_irqs(pci_common_swizzle, info->map_irq);
  33
  34                 /* Assign devices with resources */
  35                 pci_assign_unassigned_resources();
  36         } else {
  37                 pci_free_resource_list(&resources);
  38         }
  39 }
  40
  41 /* PCI Memory and Prefetchable Memory is direct-mapped. However I/O Space is
  42  * accessed through a Window which is translated to low 64KB in PCI space, the
  43  * first 4KB is not used so 60KB is available.
  44  *
  45  * This function is used by generic code to translate resource addresses into
  46  * PCI addresses.
  47  */
  48 void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
  49                              struct resource *res)
  50 {
  51         struct leon_pci_info *info = dev->bus->sysdata;
  52
  53         region->start = res->start;
  54         region->end = res->end;
  55
  56         if (res->flags & IORESOURCE_IO) {
  57                 region->start -= (info->io_space.start - 0x1000);
  58                 region->end -= (info->io_space.start - 0x1000);
  59         }
  60 }
  61 EXPORT_SYMBOL(pcibios_resource_to_bus);
  62
  63 /* see pcibios_resource_to_bus() comment */
  64 void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
  65                              struct pci_bus_region *region)
  66 {
  67         struct leon_pci_info *info = dev->bus->sysdata;
  68
  69         res->start = region->start;
  70         res->end = region->end;
  71
  72         if (res->flags & IORESOURCE_IO) {
  73                 res->start += (info->io_space.start - 0x1000);
  74                 res->end += (info->io_space.start - 0x1000);
  75         }
  76 }
  77 EXPORT_SYMBOL(pcibios_bus_to_resource);
  78
  79 void __devinit pcibios_fixup_bus(struct pci_bus *pbus)
  80 {
  81         struct leon_pci_info *info = pbus->sysdata;
  82         struct pci_dev *dev;
  83         int i, has_io, has_mem;
  84         u16 cmd;
  85
  86         list_for_each_entry(dev, &pbus->devices, bus_list) {
  87                 /*
  88                  * We can not rely on that the bootloader has enabled I/O
  89                  * or memory access to PCI devices. Instead we enable it here
  90                  * if the device has BARs of respective type.
  91                  */
  92                 has_io = has_mem = 0;
  93                 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
  94                         unsigned long f = dev->resource[i].flags;
  95                         if (f & IORESOURCE_IO)
  96                                 has_io = 1;
  97                         else if (f & IORESOURCE_MEM)
  98                                 has_mem = 1;
  99                 }
 100                 /* ROM BARs are mapped into 32-bit memory space */
 101                 if (dev->resource[PCI_ROM_RESOURCE].end != 0) {
 102                         dev->resource[PCI_ROM_RESOURCE].flags |=
 103                                                         IORESOURCE_ROM_ENABLE;
 104                         has_mem = 1;
 105                 }
 106                 pci_bus_read_config_word(pbus, dev->devfn, PCI_COMMAND, &cmd);
 107                 if (has_io && !(cmd & PCI_COMMAND_IO)) {
 108 #ifdef CONFIG_PCI_DEBUG
 109                         printk(KERN_INFO "LEONPCI: Enabling I/O for dev %s\n",
 110                                          pci_name(dev));
 111 #endif
 112                         cmd |= PCI_COMMAND_IO;
 113                         pci_bus_write_config_word(pbus, dev->devfn, PCI_COMMAND,
 114                                                                         cmd);
 115                 }
 116                 if (has_mem && !(cmd & PCI_COMMAND_MEMORY)) {
 117 #ifdef CONFIG_PCI_DEBUG
 118                         printk(KERN_INFO "LEONPCI: Enabling MEMORY for dev"
 119                                          "%s\n", pci_name(dev));
 120 #endif
 121                         cmd |= PCI_COMMAND_MEMORY;
 122                         pci_bus_write_config_word(pbus, dev->devfn, PCI_COMMAND,
 123                                                                         cmd);
 124                 }
 125         }
 126 }
 127
 128 /*
 129  * Other archs parse arguments here.
 130  */
 131 char * __devinit pcibios_setup(char *str)
 132 {
 133         return str;
 134 }
 135
 136 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
 137                                 resource_size_t size, resource_size_t align)
 138 {
 139         return res->start;
 140 }
 141
 142 int pcibios_enable_device(struct pci_dev *dev, int mask)
 143 {
 144         return pci_enable_resources(dev, mask);
 145 }
 146
 147 struct device_node *pci_device_to_OF_node(struct pci_dev *pdev)
 148 {
 149         /*
 150          * Currently the OpenBoot nodes are not connected with the PCI device,
 151          * this is because the LEON PROM does not create PCI nodes. Eventually
 152          * this will change and the same approach as pcic.c can be used to
 153          * match PROM nodes with pci devices.
 154          */
 155         return NULL;
 156 }
 157 EXPORT_SYMBOL(pci_device_to_OF_node);
 158
 159 void __devinit pcibios_update_irq(struct pci_dev *dev, int irq)
 160 {
 161 #ifdef CONFIG_PCI_DEBUG
 162         printk(KERN_DEBUG "LEONPCI: Assigning IRQ %02d to %s\n", irq,
 163                 pci_name(dev));
 164 #endif
 165         pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
 166 }
 167
 168 /* in/out routines taken from pcic.c
 169  *
 170  * This probably belongs here rather than ioport.c because
 171  * we do not want this crud linked into SBus kernels.
 172  * Also, think for a moment about likes of floppy.c that
 173  * include architecture specific parts. They may want to redefine ins/outs.
 174  *
 175  * We do not use horrible macros here because we want to
 176  * advance pointer by sizeof(size).
 177  */
 178 void outsb(unsigned long addr, const void *src, unsigned long count)
 179 {
 180         while (count) {
 181                 count -= 1;
 182                 outb(*(const char *)src, addr);
 183                 src += 1;
 184                 /* addr += 1; */
 185         }
 186 }
 187 EXPORT_SYMBOL(outsb);
 188
 189 void outsw(unsigned long addr, const void *src, unsigned long count)
 190 {
 191         while (count) {
 192                 count -= 2;
 193                 outw(*(const short *)src, addr);
 194                 src += 2;
 195                 /* addr += 2; */
 196         }
 197 }
 198 EXPORT_SYMBOL(outsw);
 199
 200 void outsl(unsigned long addr, const void *src, unsigned long count)
 201 {
 202         while (count) {
 203                 count -= 4;
 204                 outl(*(const long *)src, addr);
 205                 src += 4;
 206                 /* addr += 4; */
 207         }
 208 }
 209 EXPORT_SYMBOL(outsl);
 210
 211 void insb(unsigned long addr, void *dst, unsigned long count)
 212 {
 213         while (count) {
 214                 count -= 1;
 215                 *(unsigned char *)dst = inb(addr);
 216                 dst += 1;
 217                 /* addr += 1; */
 218         }
 219 }
 220 EXPORT_SYMBOL(insb);
 221
 222 void insw(unsigned long addr, void *dst, unsigned long count)
 223 {
 224         while (count) {
 225                 count -= 2;
 226                 *(unsigned short *)dst = inw(addr);
 227                 dst += 2;
 228                 /* addr += 2; */
 229         }
 230 }
 231 EXPORT_SYMBOL(insw);
 232
 233 void insl(unsigned long addr, void *dst, unsigned long count)
 234 {
 235         while (count) {
 236                 count -= 4;
 237                 /*
 238                  * XXX I am sure we are in for an unaligned trap here.
 239                  */
 240                 *(unsigned long *)dst = inl(addr);
 241                 dst += 4;
 242                 /* addr += 4; */
 243         }
 244 }
 245 EXPORT_SYMBOL(insl);