We need to call this whenever we want to do DMA with a device.
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
---
lib/pci.c | 7 +++++++
lib/pci.h | 1 +
2 files changed, 8 insertions(+)
diff --git a/lib/pci.c b/lib/pci.c
index 95a6581..1495f61 100644
--- a/lib/pci.c
+++ b/lib/pci.c
@@ -7,6 +7,13 @@
#include "pci.h"
#include "asm/pci.h"
+void pci_set_master(struct pci_dev *dev, int master)
+{
+ uint32_t val = pci_config_readw(dev->pci_bdf, PCI_COMMAND);
+ val |= PCI_COMMAND_MASTER;
+ pci_config_writew(dev->pci_bdf, PCI_COMMAND, val);
+}
+
bool pci_dev_exists(pcidevaddr_t dev)
{
return (pci_config_readw(dev, PCI_VENDOR_ID) != 0xffff &&
diff --git a/lib/pci.h b/lib/pci.h
index e48045c..46657f4 100644
--- a/lib/pci.h
+++ b/lib/pci.h
@@ -25,6 +25,7 @@ struct pci_dev {
void pci_dev_init(struct pci_dev *dev, pcidevaddr_t bdf);
void pci_scan_bars(struct pci_dev *dev);
+void pci_set_master(struct pci_dev *dev, int master);
extern bool pci_probe(void);
extern void pci_print(void);
--
2.7.4
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