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fixed offsets in PCI config space access

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This commit is contained in:
Markus Fröschle
2013-10-27 09:03:51 +00:00
parent bfe9a1e1b7
commit 250aae4ac4
1 changed files with 44 additions and 3 deletions
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47
sources/pci.c
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@@ -31,6 +31,47 @@
#include "util.h"
#include "wait.h"
uint16_t pci_read_config_byte(uint16_t bus, uint16_t slot, uint16_t function, uint16_t offset)
{
uint8_t value;
/* clear PCI status/command register */
MCF_PCI_PCISCR = MCF_PCI_PCISCR_PE | /* clear parity error bit */
MCF_PCI_PCISCR_SE | /* clear system error */
MCF_PCI_PCISCR_MA | /* clear master abort */
MCF_PCI_PCISCR_TR | /* clear target abort */
MCF_PCI_PCISCR_TS | /* clear target abort signalling (as target) */
MCF_PCI_PCISCR_DP; /* clear parity error */
//(void) MCF_PCI_PCISCR;
wait(1000);
/* initiate PCI configuration access to device */
MCF_PCI_PCICAR = MCF_PCI_PCICAR_E | /* enable configuration access special cycle */
MCF_PCI_PCICAR_DEVNUM(slot) | /* device number, devices 0 - 9 are reserved */
MCF_PCI_PCICAR_FUNCNUM(function) | /* function number */
MCF_PCI_PCICAR_DWORD(offset * 2);
wait(1000);
value = * (volatile uint16_t *) PCI_IO_OFFSET; /* access device */
#ifdef _NOT_USED_
/* finish config cycle */
MCF_PCI_PCICAR = MCF_PCI_PCICAR_E |
MCF_PCI_PCICAR_BUSNUM(bus) |
MCF_PCI_PCICAR_DEVNUM(slot) |
MCF_PCI_PCICAR_FUNCNUM(function) |
MCF_PCI_PCICAR_DWORD(0);
#endif /* _NOT_USED_ */
swpw(value);
return value;
}
uint16_t pci_read_config_word(uint16_t bus, uint16_t slot, uint16_t function, uint16_t offset)
{
uint16_t value;
@@ -97,7 +138,7 @@ uint32_t pci_read_config_longword(uint16_t bus, uint16_t slot, uint16_t function
MCF_PCI_PCICAR_BUSNUM(bus) |
MCF_PCI_PCICAR_DEVNUM(slot) | /* device number, devices 0 - 9 are reserved */
MCF_PCI_PCICAR_FUNCNUM(function) | /* function number */
MCF_PCI_PCICAR_DWORD(offset);
MCF_PCI_PCICAR_DWORD(offset / 2);
wait(1000);
value = * (volatile uint32_t *) PCI_IO_OFFSET; /* access device */
@@ -138,8 +179,8 @@ void pci_scan(void)
xprintf("[%02x] [%02x] [%02x]: %08x\r\n", bus, slot, function, value);
for (i = 0; i < 0x40; i += 2)
{
value = pci_read_config_word(bus, slot, function, i);
xprintf("register %02x value= %04x\r\n", i, value);
value = pci_read_config_longword(bus, slot, function, i);
xprintf("register %02x value= %08x\r\n", i, value);
}
/* test for multi-function device to avoid ghost device detects */
value = pci_read_config_longword(bus, slot, function, 0x0c);