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 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 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
  95                                 resource_size_t size, resource_size_t align)
  96 {
  97         return res->start;
  98 }
  99
 100 int pcibios_enable_device(struct pci_dev *dev, int mask)
 101 {
 102         return pci_enable_resources(dev, mask);
 103 }
 104
 105 void __devinit pcibios_update_irq(struct pci_dev *dev, int irq)
 106 {
 107 #ifdef CONFIG_PCI_DEBUG
 108         printk(KERN_DEBUG "LEONPCI: Assigning IRQ %02d to %s\n", irq,
 109                 pci_name(dev));
 110 #endif
 111         pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
 112 }
 113
 114 /* in/out routines taken from pcic.c
 115  *
 116  * This probably belongs here rather than ioport.c because
 117  * we do not want this crud linked into SBus kernels.
 118  * Also, think for a moment about likes of floppy.c that
 119  * include architecture specific parts. They may want to redefine ins/outs.
 120  *
 121  * We do not use horrible macros here because we want to
 122  * advance pointer by sizeof(size).
 123  */
 124 void outsb(unsigned long addr, const void *src, unsigned long count)
 125 {
 126         while (count) {
 127                 count -= 1;
 128                 outb(*(const char *)src, addr);
 129                 src += 1;
 130                 /* addr += 1; */
 131         }
 132 }
 133 EXPORT_SYMBOL(outsb);
 134
 135 void outsw(unsigned long addr, const void *src, unsigned long count)
 136 {
 137         while (count) {
 138                 count -= 2;
 139                 outw(*(const short *)src, addr);
 140                 src += 2;
 141                 /* addr += 2; */
 142         }
 143 }
 144 EXPORT_SYMBOL(outsw);
 145
 146 void outsl(unsigned long addr, const void *src, unsigned long count)
 147 {
 148         while (count) {
 149                 count -= 4;
 150                 outl(*(const long *)src, addr);
 151                 src += 4;
 152                 /* addr += 4; */
 153         }
 154 }
 155 EXPORT_SYMBOL(outsl);
 156
 157 void insb(unsigned long addr, void *dst, unsigned long count)
 158 {
 159         while (count) {
 160                 count -= 1;
 161                 *(unsigned char *)dst = inb(addr);
 162                 dst += 1;
 163                 /* addr += 1; */
 164         }
 165 }
 166 EXPORT_SYMBOL(insb);
 167
 168 void insw(unsigned long addr, void *dst, unsigned long count)
 169 {
 170         while (count) {
 171                 count -= 2;
 172                 *(unsigned short *)dst = inw(addr);
 173                 dst += 2;
 174                 /* addr += 2; */
 175         }
 176 }
 177 EXPORT_SYMBOL(insw);
 178
 179 void insl(unsigned long addr, void *dst, unsigned long count)
 180 {
 181         while (count) {
 182                 count -= 4;
 183                 /*
 184                  * XXX I am sure we are in for an unaligned trap here.
 185                  */
 186                 *(unsigned long *)dst = inl(addr);
 187                 dst += 4;
 188                 /* addr += 4; */
 189         }
 190 }
 191 EXPORT_SYMBOL(insl);