Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
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+5
-2
arch/parisc/include/asm/pdcpat.h
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-2
arch/parisc/include/asm/pdcpat.h
···
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#define PDC_PAT_PD 74L /* Protection Domain Info */
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#define PDC_PAT_PD_GET_ADDR_MAP 0L /* Get Address Map */
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#define PDC_PAT_PD_GET_PDC_INTERF_REV 1L /* Get PDC Interface Revisions */
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#define PDC_PAT_PD_GET_PLATFORM_COUNTER 10L /* Get 64-bit free running counter */
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#define PDC_PAT_CAPABILITY_BIT_PDC_SERIALIZE (1UL << 0)
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#define PDC_PAT_CAPABILITY_BIT_PDC_POLLING (1UL << 1)
···
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unsigned long count, unsigned long offset);
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extern int pdc_pat_pd_get_pdc_revisions(unsigned long *legacy_rev,
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unsigned long *pat_rev, unsigned long *pdc_cap);
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extern int pdc_pat_pd_get_platform_counter(uint64_t **addr,
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unsigned long *freq, unsigned long *uniq);
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extern int pdc_pat_io_pci_cfg_read(unsigned long pci_addr, int pci_size, u32 *val);
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extern int pdc_pat_io_pci_cfg_write(unsigned long pci_addr, int pci_size, u32 val);
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extern int pdc_pat_io_pci_cfg_read(unsigned long pci_addr, int pci_size, u32 *val);
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extern int pdc_pat_io_pci_cfg_write(unsigned long pci_addr, int pci_size, u32 val);
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extern int pdc_pat_mem_pdt_info(struct pdc_pat_mem_retinfo *rinfo);
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extern int pdc_pat_mem_pdt_cell_info(struct pdc_pat_mem_cell_pdt_retinfo *rinfo,
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arch/parisc/kernel/firmware.c
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arch/parisc/kernel/firmware.c
···
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return retval;
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}
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/**
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* pdc_pat_pd_get_platform_counter - Retrieve address of free-running 64-bit counter.
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* @addr: The address of the 64-bit counter.
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* @freq: The frequency of the counter, or -1 if unknown.
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* @unique: Although monotonic growing, may it return the same number twice?
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*
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*/
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int pdc_pat_pd_get_platform_counter(uint64_t **addr,
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unsigned long *freq, unsigned long *unique)
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{
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int retval;
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unsigned long flags;
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spin_lock_irqsave(&pdc_lock, flags);
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retval = mem_pdc_call(PDC_PAT_PD, PDC_PAT_PD_GET_PLATFORM_COUNTER,
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__pa(pdc_result));
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if (retval == PDC_OK) {
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*addr = (uint64_t *)pdc_result[0];
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*freq = pdc_result[1];
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*unique = pdc_result[2];
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}
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spin_unlock_irqrestore(&pdc_lock, flags);
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return retval;
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}
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/**
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* pdc_pat_io_pci_cfg_read - Read PCI configuration space.
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* @pci_addr: PCI configuration space address for which the read request is being made.
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* @pci_size: Size of read in bytes. Valid values are 1, 2, and 4.
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* @pci_size: Size of read in bytes. Valid values are 1, 2, and 4.
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* @mem_addr: Pointer to return memory buffer.
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*
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*/