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[v3,0/8] hw/arm: Implement i.MX watchdog support

Message ID 20200517162135.110364-1-linux@roeck-us.net
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Series hw/arm: Implement i.MX watchdog support | expand

Message

Guenter Roeck May 17, 2020, 4:21 p.m. UTC 
The current i.MX watchdog implementation only supports resets.
This patch series implements the full watchdog, including optional
pretimeout support.

Notable changes:
- The existing i.MX watchdog emulation (which only emulates syste resets)
  is moved from hw/misc to hw/watchdog and renamed to match the naming
  convention in hw/watchdog (patch 1/8).
- Full watchdog support is implemented in patch 2/8.
- The watchdog is wired up for i.MX25 and i.MX31 emulations (patch 3/8 and
  4/8).
- The watchdog interrupt (for pretimeout support) is connected for
  i.MX6, i.MX6UL, and i.MX7 emulations (patch 5/8, 6/8, and 8/8).
- For i.MX7, various devices are wired up as unimplemented
  devices (patch 7/8). This was necessary to avoid crashes when
  booting recent Linux kernels.

The code was tested with all available emulations.

v3: Improve handling of write-once registers and bits
    Stop timers in reset function
    Use explicit policy for timers

v2: Select WDT_IMX2 explicitly for supported platforms, not automatically
    with IMX
    Rebased to current master (as of 3/22)
    Fixed typo "octop" -> "ocotp"
    Added Reviewed-by: tags where given

----------------------------------------------------------------
Guenter Roeck (8):
      hw: Move i.MX watchdog driver to hw/watchdog
      hw/watchdog: Implement full i.MX watchdog support
      hw/arm/fsl-imx25: Wire up watchdog
      hw/arm/fsl-imx31: Wire up watchdog
      hw/arm/fsl-imx6: Connect watchdog interrupts
      hw/arm/fsl-imx6ul: Connect watchdog interrupts
      hw/arm/fsl-imx7: Instantiate various unimplemented devices
      hw/arm/fsl-imx7: Connect watchdog interrupts

 MAINTAINERS                    |   2 +
 hw/arm/Kconfig                 |   5 +
 hw/arm/fsl-imx25.c             |  10 ++
 hw/arm/fsl-imx31.c             |   6 +
 hw/arm/fsl-imx6.c              |   9 ++
 hw/arm/fsl-imx6ul.c            |  10 ++
 hw/arm/fsl-imx7.c              |  35 ++++++
 hw/misc/Makefile.objs          |   1 -
 hw/misc/imx2_wdt.c             |  90 --------------
 hw/watchdog/Kconfig            |   3 +
 hw/watchdog/Makefile.objs      |   1 +
 hw/watchdog/wdt_imx2.c         | 262 +++++++++++++++++++++++++++++++++++++++++
 include/hw/arm/fsl-imx25.h     |   5 +
 include/hw/arm/fsl-imx31.h     |   4 +
 include/hw/arm/fsl-imx6.h      |   2 +-
 include/hw/arm/fsl-imx6ul.h    |   2 +-
 include/hw/arm/fsl-imx7.h      |  23 +++-
 include/hw/misc/imx2_wdt.h     |  33 ------
 include/hw/watchdog/wdt_imx2.h |  78 ++++++++++++
 19 files changed, 454 insertions(+), 127 deletions(-)
 delete mode 100644 hw/misc/imx2_wdt.c
 create mode 100644 hw/watchdog/wdt_imx2.c
 delete mode 100644 include/hw/misc/imx2_wdt.h
 create mode 100644 include/hw/watchdog/wdt_imx2.h