/alps/pcitool

To get this branch, use:
bzr branch http://suren.me/webbzr/alps/pcitool

« back to all changes in this revision

Viewing changes to driver/pcibus.c

  • Committer: Suren A. Chilingaryan
  • Date: 2016-03-02 18:37:30 UTC
  • Revision ID: csa@suren.me-20160302183730-nlrgi7h3yuizcizc
Restructure driver headers

Show diffs side-by-side

added added

removed removed

Lines of Context:
driver/pcibus.c
 
1
#include <linux/pci.h>
 
2
 
 
3
int pcidriver_pcie_get_mps(struct pci_dev *dev)
 
4
{
 
5
    u16 ctl;
 
6
 
 
7
    pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &ctl);
 
8
 
 
9
    return 128 << ((ctl & PCI_EXP_DEVCTL_PAYLOAD) >> 5);
 
10
}
 
11
 
 
12
int pcidriver_pcie_set_mps(struct pci_dev *dev, int mps)
 
13
{
 
14
    u16 v;
 
15
 
 
16
    if (mps < 128 || mps > 4096 || !is_power_of_2(mps))
 
17
        return -EINVAL;
 
18
 
 
19
    v = ffs(mps) - 8;
 
20
    if (v > dev->pcie_mpss)
 
21
        return -EINVAL;
 
22
    v <<= 5;
 
23
 
 
24
    return pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_PAYLOAD, v);
 
25
}