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MIPS: Alchemy: Rewrite GPIO support.

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The current in-kernel Alchemy GPIO support is far too inflexible for
all my use cases.  To address this, the following changes are made:

* create generic functions which deal with manipulating the on-chip
  GPIO1/2 blocks.  Such functions are universally useful.
* Macros for GPIO2 shared interrupt management and block control.
* support for both built-in CONFIG_GPIOLIB and fast, inlined GPIO macros.

  If CONFIG_GPIOLIB is not enabled, provide linux gpio framework
  compatibility by directly inlining the GPIO1/2 functions.  GPIO access
  is limited to on-chip ones and they can be accessed as documented in
  the datasheets (GPIO0-31 and 200-215).

  If CONFIG_GPIOLIB is selected, two (2) gpio_chip-s, one for GPIO1 and
  one for GPIO2, are registered.  GPIOs can still be accessed by using
  the numberspace established in the databooks.

  However this is not yet flexible enough for my uses:  My Alchemy
  systems have a documented "external" gpio interface (fixed, different
  numberspace) and can support a variety of baseboards, some of which
  are equipped with I2C gpio expanders.  I want to be able to provide
  the default 16 GPIOs of the CPU board numbered as 0..15 and also
  support gpio expanders, if present, starting as gpio16.

  To achieve this, a new Kconfig symbol for Alchemy is introduced,
  CONFIG_ALCHEMY_GPIO_INDIRECT, which boards can enable to signal
  that they don't want the Alchemy numberspace exposed to the outside
  world, but instead want to provide their own.  Boards are now respon-
  sible for providing the linux gpio interface glue code (either in a
  custom gpio.h header (in board include directory) or with gpio_chips).

  To make the board-specific inlined gpio functions work, the MIPS
  Makefile must be changed so that the mach-au1x00/gpio.h header is
  included _after_ the board headers, by moving the inclusion of
  the mach-au1x00/ to the end of the header list.

  See arch/mips/include/asm/mach-au1x00/gpio.h for more info.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Acked-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Manuel Lauss
2009-06-06 14:09:55 +02:00
committed by Ralf Baechle
parent eeb09e6545
commit 51e02b02e6
7 changed files with 770 additions and 233 deletions
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35
arch/mips/include/asm/mach-au1x00/gpio.h
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@@ -1,33 +1,10 @@
#ifndef _AU1XXX_GPIO_H_
#define _AU1XXX_GPIO_H_
#ifndef _ALCHEMY_GPIO_H_
#define _ALCHEMY_GPIO_H_
#include <linux/types.h>
#if defined(CONFIG_ALCHEMY_GPIO_AU1000)
#define AU1XXX_GPIO_BASE 200
#include <asm/mach-au1x00/gpio-au1000.h>
/* GPIO bank 1 offsets */
#define AU1000_GPIO1_TRI_OUT 0x0100
#define AU1000_GPIO1_OUT 0x0108
#define AU1000_GPIO1_ST 0x0110
#define AU1000_GPIO1_CLR 0x010C
#endif
/* GPIO bank 2 offsets */
#define AU1000_GPIO2_DIR 0x00
#define AU1000_GPIO2_RSVD 0x04
#define AU1000_GPIO2_OUT 0x08
#define AU1000_GPIO2_ST 0x0C
#define AU1000_GPIO2_INT 0x10
#define AU1000_GPIO2_EN 0x14
#define GPIO2_OUT_EN_MASK 0x00010000
#define gpio_to_irq(gpio) NULL
#define gpio_get_value __gpio_get_value
#define gpio_set_value __gpio_set_value
#define gpio_cansleep __gpio_cansleep
#include <asm-generic/gpio.h>
#endif /* _AU1XXX_GPIO_H_ */
#endif /* _ALCHEMY_GPIO_H_ */