linux-kernel - [PATCH v4 0/1] Switchtec Switch DMA Engine Driver

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Message-ID: <20230423213717.318655-1-kelvin.cao@microchip.com>
Date:   Sun, 23 Apr 2023 14:37:16 -0700
From:   Kelvin Cao <kelvin.cao@...rochip.com>
To:     <vkoul@...nel.org>, <dmaengine@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <logang@...tatee.com>, <george.ge@...rochip.com>,
        <christophe.jaillet@...adoo.fr>, <hch@...radead.org>
Subject: [PATCH v4 0/1] Switchtec Switch DMA Engine Driver

Hi,
 
This is v4 of the Switchtec Switch DMA Engine Driver, incorporating
changes for the v2/v3 review comments.
 
v4 changes:
 - Sort driver entry in drivers/dma/Kconfig and drivers/dma/Makefile
   alphabetically 
 - Fix miscellaneous style issues
 - Correct year in copyright
 - Add function and call sites to flush PCIe MMIO Write
 - Add a helper to wait for status register update
 - Move synchronize_irq out of RCU critical section
 - Remove unnecessary endianness conversion for register access
 - Remove some unused code
 - Use pci_enable_device/pci_request_mem_regions instead of
   pcim_enable_device/pcim_iomap_regions to make the resource lifetime
   management more understandable
 - Use offset macros instead of memory mapped structures when accessing
   some registers
 - Remove the attempt to set DMA mask with smaller number as it would 
   never succeed if the first attempt with bigger number fails
 - Use PCI_VENDOR_ID_MICROSEMI in include/linux/pci_ids.h as device ID

v3 changes:
  - Remove some unnecessary memory/variable zeroing
 
v2 changes:
  - Move put_device(dma_dev->dev) before kfree(swdma_dev) as dma_dev is
    part of swdma_dev.
  - Convert dev_ print calls to pci_ print calls to make the use of
    print functions consistent within switchtec_dma_create().
  - Remove some dev_ print calls, which use device pointer as handles,
    to ensure there's no reference issue when the device is unbound.
  - Remove unused .driver_data from pci_device_id structure.
 
v1:
The following patch implements a DMAEngine driver to use the DMA
controller in Switchtec PSX/PFX switchtes. The DMA controller appears as
a PCI function on the switch upstream port. The DMA function can include
one or more DMA channels.
 
This patchset is based off of v6.3-rc7.

Kelvin Cao (1):
  dmaengine: switchtec-dma: Introduce Switchtec DMA engine PCI driver

 MAINTAINERS                 |    5 +
 drivers/dma/Kconfig         |    9 +
 drivers/dma/Makefile        |    1 +
 drivers/dma/switchtec_dma.c | 1614 +++++++++++++++++++++++++++++++++++
 4 files changed, 1629 insertions(+)
 create mode 100644 drivers/dma/switchtec_dma.c

-- 
2.25.1