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| author | Suren A. Chilingaryan <csa@suren.me> | 2016-03-02 19:37:30 +0100 |
|---|---|---|
| committer | Suren A. Chilingaryan <csa@suren.me> | 2016-03-02 19:37:30 +0100 |
| commit | 1120e8745ccd3e512fe2016c9e5092fcd378490a (patch) | |
| tree | 0e89ac6cd82c213a78d79d10d3fecff06f21127d /driver/pcibus.c | |
| parent | 01e857cca352e73243d00b62a0c248a35cea6b71 (diff) | |
| download | pcitool-1120e8745ccd3e512fe2016c9e5092fcd378490a.tar.gz pcitool-1120e8745ccd3e512fe2016c9e5092fcd378490a.tar.bz2 pcitool-1120e8745ccd3e512fe2016c9e5092fcd378490a.tar.xz pcitool-1120e8745ccd3e512fe2016c9e5092fcd378490a.zip | |
Restructure driver headers
Diffstat (limited to 'driver/pcibus.c')
| -rw-r--r-- | driver/pcibus.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/driver/pcibus.c b/driver/pcibus.c new file mode 100644 index 0000000..f28f527 --- /dev/null +++ b/driver/pcibus.c @@ -0,0 +1,25 @@ +#include <linux/pci.h> + +int pcidriver_pcie_get_mps(struct pci_dev *dev) +{ + u16 ctl; + + pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &ctl); + + return 128 << ((ctl & PCI_EXP_DEVCTL_PAYLOAD) >> 5); +} + +int pcidriver_pcie_set_mps(struct pci_dev *dev, int mps) +{ + u16 v; + + if (mps < 128 || mps > 4096 || !is_power_of_2(mps)) + return -EINVAL; + + v = ffs(mps) - 8; + if (v > dev->pcie_mpss) + return -EINVAL; + v <<= 5; + + return pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_PAYLOAD, v); +} |