diff options
Diffstat (limited to 'arch/parisc/kernel/firmware.c')
| -rw-r--r-- | arch/parisc/kernel/firmware.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/arch/parisc/kernel/firmware.c b/arch/parisc/kernel/firmware.c index 042343492a28..c35a34809743 100644 --- a/arch/parisc/kernel/firmware.c +++ b/arch/parisc/kernel/firmware.c @@ -1643,11 +1643,36 @@ int pdc_pat_pd_get_pdc_revisions(unsigned long *legacy_rev, return retval; } +/** + * pdc_pat_pd_get_platform_counter - Retrieve address of free-running 64-bit counter. + * @addr: The address of the 64-bit counter. + * @freq: The frequency of the counter, or -1 if unknown. + * @unique: Although monotonic growing, may it return the same number twice? + * + */ +int pdc_pat_pd_get_platform_counter(uint64_t **addr, + unsigned long *freq, unsigned long *unique) +{ + int retval; + unsigned long flags; + + spin_lock_irqsave(&pdc_lock, flags); + retval = mem_pdc_call(PDC_PAT_PD, PDC_PAT_PD_GET_PLATFORM_COUNTER, + __pa(pdc_result)); + if (retval == PDC_OK) { + *addr = (uint64_t *)pdc_result[0]; + *freq = pdc_result[1]; + *unique = pdc_result[2]; + } + spin_unlock_irqrestore(&pdc_lock, flags); + + return retval; +} /** * pdc_pat_io_pci_cfg_read - Read PCI configuration space. * @pci_addr: PCI configuration space address for which the read request is being made. - * @pci_size: Size of read in bytes. Valid values are 1, 2, and 4. + * @pci_size: Size of read in bytes. Valid values are 1, 2, and 4. * @mem_addr: Pointer to return memory buffer. * */ |