linux-toradex.git/drivers/gpio/basic_mmio_gpio.c, branch v3.0.63

basic_mmio_gpio: split into a gpio library and platform device

2011-05-20T06:40:19+00:00

Allow GPIO_BASIC_MMIO_CORE to be used to provide an accessor library
for implementing GPIO drivers whilst abstracting the register access
detail.  Based on a patch from Anton Vorontsov[1] and adapted to allow
bgpio_chip to be embedded in another structure.

Changes since v1:
	- Register the gpio_chip in the platform device probe

1. https://lkml.org/lkml/2011/4/19/401

Signed-off-by: Anton Vorontsov 
Signed-off-by: Jamie Iles 
Signed-off-by: Grant Likely

basic_mmio_gpio: convert to non-__raw* accessors

2011-05-20T06:40:17+00:00

The __raw_* accessors don't include memory barriers and can cause
problems when writes get stuck in write buffers.

Suggested-by: Linus Walleij 
Acked-by: Anton Vorontsov 
Signed-off-by: Jamie Iles 
Signed-off-by: Grant Likely

basic_mmio_gpio: support direction registers

2011-05-20T06:40:17+00:00

Most controllers require the direction of a GPIO to be set by writing to
a direction register.  Add support for either an input direction
register or an output direction register.

Signed-off-by: Jamie Iles 
Acked-by: Anton Vorontsov 
Signed-off-by: Grant Likely

basic_mmio_gpio: support different input/output registers

2011-05-20T06:40:16+00:00

Some controllers have separate input and output registers.  For these
controllers, use "set" for the output and "dat" for the input.

Changes since v2: reuse "set" for output and "dat" for input rather than
adding a new "in" register.

Signed-off-by: Jamie Iles 
Acked-by: Anton Vorontsov 
Signed-off-by: Grant Likely

basic_mmio_gpio: detect output method at probe time

2011-05-20T06:40:16+00:00

Rather than detecting the output method each time in the .set()
callback, do it at probe time and set the appropriate callback.

Changes since v2: moved the reg_dat initialization into
bgpio_setup_io().

Signed-off-by: Jamie Iles 
Acked-by: Anton Vorontsov 
Signed-off-by: Grant Likely

basic_mmio_gpio: request register regions

2011-05-20T06:40:16+00:00

Make sure that we get the register regions with request_mem_region()
before ioremap() to make sure we have exclusive access.

Signed-off-by: Jamie Iles 
Acked-by: Anton Vorontsov 
Signed-off-by: Grant Likely

basic_mmio_gpio: allow overriding number of gpio

2011-05-20T06:40:15+00:00

Some platforms may have a number of GPIO that is less than the register
width of the peripheral.

Signed-off-by: Jamie Iles 
Acked-by: Anton Vorontsov 
Signed-off-by: Grant Likely

basic_mmio_gpio: convert to platform_{get,set}_drvdata()

2011-05-20T06:40:14+00:00

Use the platform drvdata helpers rather than working on the struct
device itself.

Signed-off-by: Jamie Iles 
Acked-by: Anton Vorontsov 
Signed-off-by: Grant Likely

basic_mmio_gpio: remove runtime width/endianness evaluation

2011-05-20T06:40:14+00:00

Remove endianness/width calculations at runtime by installing function
pointers for bit-to-mask conversion and register accessors.

Reported-by: Thomas Gleixner 
Signed-off-by: Jamie Iles 
Acked-by: Anton Vorontsov 
Signed-off-by: Grant Likely

gpio: add driver for basic memory-mapped GPIO controllers

2010-10-28T01:03:06+00:00

The basic GPIO controllers may be found in various on-board FPGA and ASIC
solutions that are used to control board's switches, LEDs, chip-selects,
Ethernet/USB PHY power, etc.

These controllers may not provide any means of pin setup
(in/out/open drain).

The driver supports:
- 8/16/32/64 bits registers;
- GPIO controllers with clear/set registers;
- GPIO controllers with a single "data" register;
- Big endian bits/GPIOs ordering (mostly used on PowerPC).

Signed-off-by: Anton Vorontsov 
Reviewed-by: Mark Brown 
Cc: David Brownell 
Cc: Samuel Ortiz ,
Cc: Alan Cox 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds