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baa914cd81
linux/drivers/firewire
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Takashi Sakamoto baa914cd81 firewire: add kernel API to access CYCLE_TIME register 
1394 OHCI specification defined Isochronous Cycle Timer Register to get
value of CYCLE_TIME register defined by IEEE 1394 for CSR architecture
defined by ISO/IEC 13213. Unit driver can calculate packet time by
compute with the value of CYCLE_TIME and timeStamp field in descriptor
of each isochronous and asynchronous context. The resolution of CYCLE_TIME
is 49.576 MHz, while the one of timeStamp is 8,000 Hz.

Current implementation of Linux FireWire subsystem allows the driver to
get the value of CYCLE_TIMER CSR register by transaction service. The
transaction service has overhead in regard of access to MMIO register.

This commit adds kernel API for unit driver to access the register
directly.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20220405072221.226217-3-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2022-04-05 18:23:04 +02:00
..
core-card.c firewire: add kernel API to access CYCLE_TIME register 2022-04-05 18:23:04 +02:00
core-cdev.c firewire: add kernel API to access CYCLE_TIME register 2022-04-05 18:23:04 +02:00
core-device.c bus: Make remove callback return void 2021-07-21 11:53:42 +02:00
core-iso.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
core-topology.c firewire: core: Fix fall-through warnings for Clang 2021-05-17 19:40:32 -05:00
core-transaction.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
core.h firewire: ohci: Replace zero-length array with flexible-array 2020-06-15 23:08:31 -05:00
init_ohci1394_dma.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
net.c firewire: don't write directly to netdev->dev_addr 2021-10-28 12:47:09 +01:00
nosy-user.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nosy.c firewire: nosy: switch from 'pci_' to 'dma_' API 2021-07-05 22:23:15 +02:00
nosy.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ohci.c firewire: ohci: Use tasklet_disable_in_atomic() where required 2021-03-17 16:34:05 +01:00
ohci.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sbp2.c scsi: firewire: sbp2: Switch to attribute groups 2021-10-16 21:45:52 -04:00