On Wed, Nov 09, 2016 at 10:10:17AM -0500, Peter Xu wrote:
> Helper function to set/clear specific bit in PCI_COMMAND register.
>
> Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
> ---
> lib/pci.c | 12 ++++++++++++
> lib/pci.h | 1 +
> 2 files changed, 13 insertions(+)
>
> diff --git a/lib/pci.c b/lib/pci.c
> index c063d53..fd17ea5 100644
> --- a/lib/pci.c
> +++ b/lib/pci.c
> @@ -7,6 +7,18 @@
> #include "pci.h"
> #include "asm/pci.h"
>
> +void pci_cmd_set_clr(struct pci_dev *dev, uint16_t set, uint16_t clr)
> +{
> + uint16_t val = pci_config_readw(dev->bdf, PCI_COMMAND);
> +
> + /* No overlap is allowed */
> + assert((set & clr) == 0);
> + val |= set;
> + val &= ~clr;
> +
> + pci_config_writew(dev->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 e452819..de15086 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_cmd_set_clr(struct pci_dev *dev, uint16_t set, uint16_t clr);
>
> extern bool pci_probe(void);
> extern void pci_print(void);
> --
> 2.7.4
>
Reviewed-by: Andrew Jones <drjones@xxxxxxxxxx>
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