This series adds support for a serial uclass, enabling serial drivers to be converted to use driver model.
Unfortunately this is quite a complicated process for a number of reasons:
- serial is used before relocation, but driver model does not support this - stdio member functions are not passed a device pointer, but driver model requires this (so does serial, but it uses an ugly work-around) - driver model requires malloc() but this is not available before relocation - for sandbox, if something goes wrong with the console, we still need to get an error message out through the fallback console
So this series includes quite a few patches to address the above, as well as the serial uclass and an implementation for sandbox.
The early malloc() implementation uses a very simple region of memory which it doles out as needed. This means that driver model can start up with very little memory usage, and no overhead for malloc() itself except for space wasted due to alignment. With a 32-bit machine and just a serial port set as a pre-reloc device (plus the mandatory root device), the usage is 176 bytes.
If you have limited time, please take a look at least at the uclass patch which is 'dm: Add a uclass for serial devices' (see include/serial.h).
The series is based on the Tegra GPIO series v3. You can get this tree in a rough unfinished form from u-boot-x86.git branch us-gpioe.
Note: This series is for comments only as there are some build errors for certain boards.
Simon Glass (22): stdio: Remove redundant code around stdio_register() calls stdio: Pass device pointer to stdio methods dm: Make sure that the root device is probed dm: Provide a way to shut down driver model sandbox: Remove all drivers before exit dm: Tidy up four minor code nits dm: Allow drivers to be marked 'before relocation' dm: Use '*' to indicate a device is activated Remove form-feeds from dlmalloc.c Add a simple malloc() implementation for pre-relocation sandbox: config: Enable pre-relocation malloc() dm: Support driver model prior to relocation stdio: Provide functions to add/remove devices using stdio_dev console: Remove vprintf() optimisation for sandbox Add a flag indicating when the serial console is ready dm: Add a way to indicate a preferred device within a uclass dm: Expand and improve the device lifecycle docs dm: Add a uclass for serial devices Set up stdio earlier when using driver model sandbox: Convert serial driver to use driver model sandbox: serial: Support a coloured console sandbox: dts: Add a serial console node
README | 16 +++ arch/blackfin/cpu/jtag-console.c | 10 +- arch/powerpc/cpu/mpc512x/serial.c | 10 +- arch/powerpc/cpu/mpc8xx/video.c | 6 +- arch/sandbox/cpu/cpu.c | 4 + arch/sandbox/dts/sandbox.dts | 11 ++ arch/x86/lib/video.c | 8 +- board/bf527-ezkit/video.c | 10 -- board/bf548-ezkit/video.c | 10 -- board/cm-bf548/video.c | 10 -- board/mpl/common/kbd.c | 6 +- board/mpl/common/kbd.h | 6 +- board/mpl/pati/pati.c | 8 +- board/netphone/phone_console.c | 16 +-- board/nokia/rx51/rx51.c | 6 +- board/rbc823/kbd.c | 8 +- common/board_f.c | 42 ++++++++ common/board_r.c | 28 +++-- common/cmd_log.c | 11 +- common/console.c | 24 ++--- common/dlmalloc.c | 81 ++++++++++---- common/lcd.c | 14 ++- common/stdio.c | 63 ++++++++--- common/usb_kbd.c | 6 +- doc/driver-model/README.txt | 220 +++++++++++++++++++++++++++++++++++--- drivers/core/device.c | 11 +- drivers/core/lists.c | 6 +- drivers/core/root.c | 22 +++- drivers/core/uclass.c | 15 ++- drivers/input/cros_ec_keyb.c | 6 +- drivers/input/i8042.c | 4 +- drivers/input/keyboard.c | 6 +- drivers/input/tegra-kbc.c | 6 +- drivers/misc/cbmem_console.c | 6 +- drivers/net/netconsole.c | 10 +- drivers/serial/Makefile | 4 + drivers/serial/sandbox.c | 140 +++++++++++++++++++----- drivers/serial/serial-uclass.c | 161 ++++++++++++++++++++++++++++ drivers/serial/serial.c | 55 ++++++++-- drivers/serial/usbtty.c | 8 +- drivers/video/cfb_console.c | 8 +- include/asm-generic/global_data.h | 7 ++ include/common.h | 5 + include/configs/ELPPC.h | 4 +- include/configs/MHPC.h | 4 +- include/configs/jadecpu.h | 4 +- include/configs/nokia_rx51.h | 5 +- include/configs/sandbox.h | 7 ++ include/dm/device-internal.h | 6 +- include/dm/device.h | 10 +- include/dm/lists.h | 22 +++- include/dm/root.h | 18 +++- include/dm/uclass-id.h | 1 + include/dm/uclass-internal.h | 3 +- include/dm/uclass.h | 21 +++- include/i8042.h | 6 +- include/serial.h | 90 ++++++++++++++++ include/stdio_dev.h | 17 +-- include/video.h | 8 +- test/dm/cmd_dm.c | 11 +- test/dm/core.c | 49 +++++++-- test/dm/test-driver.c | 11 ++ test/dm/test-fdt.c | 34 +++++- test/dm/test-main.c | 4 +- test/dm/test.dts | 12 +++ 65 files changed, 1186 insertions(+), 275 deletions(-) create mode 100644 drivers/serial/serial-uclass.c