66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/io.h>
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#include <asm/mach-ralink/rt288x.h>
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#include <asm/mach-ralink/rt288x_pci.h>
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#ifdef CONFIG_PCI
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#define PCI_ACCESS_READ 0
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#define PCI_ACCESS_WRITE 1
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static int config_access(unsigned char access_type, struct pci_bus *bus,
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unsigned int devfn, unsigned char where, u32 * data)
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{
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unsigned int slot = PCI_SLOT(devfn);
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unsigned int address;
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u8 func = PCI_FUNC(devfn);
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address = (bus->number << 16) | (slot << 11) | (func << 8) | (where& 0xfc) | 0x80000000;
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writel(address, RT2880_PCI_CONFIG_ADDR);
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if (access_type == PCI_ACCESS_WRITE)
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writel(*data, RT2880_PCI_CONFIG_DATA);
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else
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*data = readl(RT2880_PCI_CONFIG_DATA);
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return 0;
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}
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int
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pci_config_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 * val)
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{
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u32 data = 0;
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if(config_access(PCI_ACCESS_READ, bus, devfn, where, &data))
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return PCIBIOS_DEVICE_NOT_FOUND;
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if(size == 1)
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*val = (data >> ((where & 3) << 3)) & 0xff;
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else if(size == 2)
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*val = (data >> ((where & 3) << 3)) & 0xffff;
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else
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*val = data;
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return PCIBIOS_SUCCESSFUL;
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}
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int
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pci_config_write(struct pci_bus *bus, unsigned int devfn,
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int where, int size, u32 val)
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{
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u32 data = 0;
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if(size == 4)
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{
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data = val;
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} else {
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if(config_access(PCI_ACCESS_READ, bus, devfn, where, &data))
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return PCIBIOS_DEVICE_NOT_FOUND;
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if(size == 1)
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data = (data & ~(0xff << ((where & 3) << 3))) |
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(val << ((where & 3) << 3));
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else if(size == 2)
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data = (data & ~(0xffff << ((where & 3) << 3))) |
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(val << ((where & 3) << 3));
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}
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if(config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data))
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return PCIBIOS_DEVICE_NOT_FOUND;
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return PCIBIOS_SUCCESSFUL;
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}
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#endif
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