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59 lines
1.4 KiB
59 lines
1.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/kernel.h> |
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#include <linux/pci.h> |
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#include <asm/pci-direct.h> |
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#include <asm/io.h> |
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#include <asm/pci_x86.h> |
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/* Direct PCI access. This is used for PCI accesses in early boot before |
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the PCI subsystem works. */ |
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u32 read_pci_config(u8 bus, u8 slot, u8 func, u8 offset) |
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{ |
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u32 v; |
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outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); |
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v = inl(0xcfc); |
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return v; |
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} |
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u8 read_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset) |
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{ |
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u8 v; |
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outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); |
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v = inb(0xcfc + (offset&3)); |
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return v; |
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} |
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u16 read_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset) |
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{ |
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u16 v; |
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outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); |
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v = inw(0xcfc + (offset&2)); |
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return v; |
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} |
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void write_pci_config(u8 bus, u8 slot, u8 func, u8 offset, |
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u32 val) |
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{ |
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outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); |
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outl(val, 0xcfc); |
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} |
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void write_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset, u8 val) |
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{ |
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outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); |
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outb(val, 0xcfc + (offset&3)); |
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} |
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void write_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset, u16 val) |
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{ |
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outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); |
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outw(val, 0xcfc + (offset&2)); |
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} |
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int early_pci_allowed(void) |
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{ |
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return (pci_probe & (PCI_PROBE_CONF1|PCI_PROBE_NOEARLY)) == |
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PCI_PROBE_CONF1; |
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} |
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