target/linux/ramips/files/arch/mips/pci/ops-rt288x.c

   1 #include <linux/types.h>
   2 #include <linux/pci.h>
   3 #include <linux/io.h>
   4
   5 #include <asm/mach-ralink/rt288x.h>
   6 #include <asm/mach-ralink/rt288x_pci.h>
   7
   8 #define PCI_ACCESS_READ  0
   9 #define PCI_ACCESS_WRITE 1
  10
  11 static int config_access(unsigned char access_type, struct pci_bus *bus,
  12         unsigned int devfn, unsigned char where, u32 * data)
  13 {
  14         unsigned int slot = PCI_SLOT(devfn);
  15         unsigned int address;
  16         u8 func = PCI_FUNC(devfn);
  17         address = (bus->number << 16) | (slot << 11) | (func << 8) | (where& 0xfc) | 0x80000000;
  18         writel(address, RT2880_PCI_CONFIG_ADDR);
  19         if (access_type == PCI_ACCESS_WRITE)
  20                 writel(*data, RT2880_PCI_CONFIG_DATA);
  21         else
  22                 *data = readl(RT2880_PCI_CONFIG_DATA);
  23         return 0;
  24 }
  25
  26 int
  27 pci_config_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 * val)
  28 {
  29         u32 data = 0;
  30         if(config_access(PCI_ACCESS_READ, bus, devfn, where, &data))
  31                 return PCIBIOS_DEVICE_NOT_FOUND;
  32         if(size == 1)
  33                 *val = (data >> ((where & 3) << 3)) & 0xff;
  34         else if(size == 2)
  35                 *val = (data >> ((where & 3) << 3)) & 0xffff;
  36         else
  37                 *val = data;
  38         return PCIBIOS_SUCCESSFUL;
  39 }
  40
  41 int
  42 pci_config_write(struct pci_bus *bus, unsigned int devfn,
  43         int where, int size, u32 val)
  44 {
  45         u32 data = 0;
  46         if(size == 4)
  47         {
  48                 data = val;
  49         } else {
  50                 if(config_access(PCI_ACCESS_READ, bus, devfn, where, &data))
  51                         return PCIBIOS_DEVICE_NOT_FOUND;
  52                 if(size == 1)
  53                         data = (data & ~(0xff << ((where & 3) << 3))) |
  54                                 (val << ((where & 3) << 3));
  55                 else if(size == 2)
  56                         data = (data & ~(0xffff << ((where & 3) << 3))) |
  57                                 (val << ((where & 3) << 3));
  58         }
  59         if(config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data))
  60                 return PCIBIOS_DEVICE_NOT_FOUND;
  61         return PCIBIOS_SUCCESSFUL;
  62 }