[PATCH 00/31] block/swim: Fixes and improvements

[Finn Thain]

I recently had a need for the 'swim' driver but found that it was too buggy
to be useful for my purposes. I had two aims in mind--

Firstly, I needed this driver to help me test my new BMoW Floppy Emu for 
emulation correctness. Being that Linux is open source and MacOS is not,
this driver should be ideal for that.

Secondly, I needed to realign the heads in some disk drives. The swim driver
has most of the code needed for a feedback loop for manual re-alignment, so
I wrote the remaining code and pushed it to a repo here:
https://github.com/fthain/linux/commits/swim/

These patches fix all the bugs I found. They improve stability,
compatibility and performance. Additional patches improve source code
quality by removing redundant code and cleaning up a bit.

This patch series was successfully tested on the following systems.

Mac Quadra 650 - SWIM 2 with Mitsubishi FDD
Mac LC III     - SWIM 2 with Mitsubishi FDD and Sony FDD
Mac Quadra 700 - SWIM with Sony FDD
Mac IIvx       - SWIM with Sony FDD

---

Finn Thain (31):
  swim: Assert strobe with stable outputs
  swim: Select appropriate drive once only
  swim: Enable the drive when probing
  swim: Don't disable drive after every sector
  swim: Perform ISM/IWM mode switching according to specs
  swim: Configure parameter memory
  swim: Enable clock divider only where appropriate
  swim: Don't start motor until medium is present
  swim: Recalibrate when drive is probed
  swim: Add track zero recalibration delay
  swim: Handle FIFO timeout error
  swim: Simplify return value initialization
  swim: Check for CRC errors
  swim: Check error register during sector read
  swim: Don't use the mark register to read data
  swim: Fix buffer overflow
  swim: Convert to blocking queue
  swim: Remove redundant RELAX actions
  swim: Deduplicate polling loops
  swim: Check drive ready bit
  swim: Revisit delays
  swim: Remove pointless mode0 register write
  swim: Don't needlessly re-read sectors
  swim: Remove pointless specifiers
  swim: Move swd initialization
  swim: Add some helpful references
  swim: Remove unused macro definitions
  swim: Clean up whitespace
  swim: Define macros for constants
  swim: Define symbols for constants
  swim: Unexport global symbols

 arch/m68k/mac/config.c   |  31 ++-
 drivers/block/swim.c     | 422 ++++++++++++++++++++-------------------
 drivers/block/swim_asm.S | 306 ++++++++++++++--------------
 3 files changed, 403 insertions(+), 356 deletions(-)

-- 
2.52.0