diff options
| author | Helge Deller <deller@gmx.de> | 2026-02-06 21:26:40 +0100 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2026-02-07 00:45:19 +0100 |
| commit | 0b3b90a0f971e4289367f172cfc36c934741b209 (patch) | |
| tree | 1ba2bdd46dc3c302eb33a2b34baeae0433ea4d61 | |
| parent | 5ff7842103f60b29b9907d25b371f65d5b40bbe4 (diff) | |
parisc: Add PDC PAT call to get free running 64-bit counter
PDC PAT defines this optional function. Testing on my C8000 workstation
and a rp3440 server did not indicate that they provide such counter.
Nevertheless, add the function since we should try to use such a
counter if it's available. In Qemu it should be simple to add it.
Signed-off-by: Helge Deller <deller@gmx.de>
| -rw-r--r-- | arch/parisc/include/asm/pdcpat.h | 7 | ||||
| -rw-r--r-- | arch/parisc/kernel/firmware.c | 27 |
2 files changed, 31 insertions, 3 deletions
diff --git a/arch/parisc/include/asm/pdcpat.h b/arch/parisc/include/asm/pdcpat.h index 84ac81b1adde..ec97eefa4ef6 100644 --- a/arch/parisc/include/asm/pdcpat.h +++ b/arch/parisc/include/asm/pdcpat.h @@ -179,6 +179,7 @@ #define PDC_PAT_PD 74L /* Protection Domain Info */ #define PDC_PAT_PD_GET_ADDR_MAP 0L /* Get Address Map */ #define PDC_PAT_PD_GET_PDC_INTERF_REV 1L /* Get PDC Interface Revisions */ +#define PDC_PAT_PD_GET_PLATFORM_COUNTER 10L /* Get 64-bit free running counter */ #define PDC_PAT_CAPABILITY_BIT_PDC_SERIALIZE (1UL << 0) #define PDC_PAT_CAPABILITY_BIT_PDC_POLLING (1UL << 1) @@ -373,9 +374,11 @@ extern int pdc_pat_pd_get_addr_map(unsigned long *actual_len, void *mem_addr, unsigned long count, unsigned long offset); extern int pdc_pat_pd_get_pdc_revisions(unsigned long *legacy_rev, unsigned long *pat_rev, unsigned long *pdc_cap); +extern int pdc_pat_pd_get_platform_counter(uint64_t **addr, + unsigned long *freq, unsigned long *uniq); -extern int pdc_pat_io_pci_cfg_read(unsigned long pci_addr, int pci_size, u32 *val); -extern int pdc_pat_io_pci_cfg_write(unsigned long pci_addr, int pci_size, u32 val); +extern int pdc_pat_io_pci_cfg_read(unsigned long pci_addr, int pci_size, u32 *val); +extern int pdc_pat_io_pci_cfg_write(unsigned long pci_addr, int pci_size, u32 val); extern int pdc_pat_mem_pdt_info(struct pdc_pat_mem_retinfo *rinfo); extern int pdc_pat_mem_pdt_cell_info(struct pdc_pat_mem_cell_pdt_retinfo *rinfo, 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. * */ |