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[pci] Generalise function-level reset mechanism

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2022-08-08 16:39:40 +01:00
parent 9dfcdc04c8
commit 0965cec53c
3 changed files with 26 additions and 20 deletions
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22
src/drivers/bus/pciextra.c
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@@ -1,6 +1,7 @@
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <stdint.h>
#include <ipxe/timer.h>
#include <ipxe/pci.h>
static int pci_find_capability_common ( struct pci_device *pci,
@@ -112,3 +113,24 @@ unsigned long pci_bar_size ( struct pci_device *pci, unsigned int reg ) {
size = size & ~( size - 1 );
return size;
}
/**
* Perform PCI Express function-level reset (FLR)
*
* @v pci PCI device
* @v exp PCI Express Capability address
*/
void pci_reset ( struct pci_device *pci, unsigned int exp ) {
uint16_t control;
/* Perform a PCIe function-level reset */
pci_read_config_word ( pci, ( exp + PCI_EXP_DEVCTL ), &control );
control |= PCI_EXP_DEVCTL_FLR;
pci_write_config_word ( pci, ( exp + PCI_EXP_DEVCTL ), control );
/* Allow time for reset to complete */
mdelay ( PCI_EXP_FLR_DELAY_MS );
/* Re-enable device */
adjust_pci_device ( pci );
}