mirror of https://gitee.com/openkylin/linux.git
ARM: 6155/1: nomadik-gpio: add pin configuration API
Add a pin configuration API to all pin-related configuration to be specified with a single macro and groups of pins to be configured at one go. Based on the PXA MFP implementation. Cc: Alessandro Rubini <rubini@unipv.it> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
parent
6f9a974cf6
commit
378be0663d
|
@ -23,6 +23,7 @@
|
|||
#include <linux/irq.h>
|
||||
#include <linux/slab.h>
|
||||
|
||||
#include <plat/pincfg.h>
|
||||
#include <mach/hardware.h>
|
||||
#include <mach/gpio.h>
|
||||
|
||||
|
@ -95,6 +96,101 @@ static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip,
|
|||
writel(bit, nmk_chip->addr + NMK_GPIO_DATC);
|
||||
}
|
||||
|
||||
static void __nmk_gpio_make_input(struct nmk_gpio_chip *nmk_chip,
|
||||
unsigned offset)
|
||||
{
|
||||
writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC);
|
||||
}
|
||||
|
||||
static void __nmk_config_pin(struct nmk_gpio_chip *nmk_chip, unsigned offset,
|
||||
pin_cfg_t cfg)
|
||||
{
|
||||
static const char *afnames[] = {
|
||||
[NMK_GPIO_ALT_GPIO] = "GPIO",
|
||||
[NMK_GPIO_ALT_A] = "A",
|
||||
[NMK_GPIO_ALT_B] = "B",
|
||||
[NMK_GPIO_ALT_C] = "C"
|
||||
};
|
||||
static const char *pullnames[] = {
|
||||
[NMK_GPIO_PULL_NONE] = "none",
|
||||
[NMK_GPIO_PULL_UP] = "up",
|
||||
[NMK_GPIO_PULL_DOWN] = "down",
|
||||
[3] /* illegal */ = "??"
|
||||
};
|
||||
static const char *slpmnames[] = {
|
||||
[NMK_GPIO_SLPM_INPUT] = "input",
|
||||
[NMK_GPIO_SLPM_NOCHANGE] = "no-change",
|
||||
};
|
||||
|
||||
int pin = PIN_NUM(cfg);
|
||||
int pull = PIN_PULL(cfg);
|
||||
int af = PIN_ALT(cfg);
|
||||
int slpm = PIN_SLPM(cfg);
|
||||
|
||||
dev_dbg(nmk_chip->chip.dev, "pin %d: af %s, pull %s, slpm %s\n",
|
||||
pin, afnames[af], pullnames[pull], slpmnames[slpm]);
|
||||
|
||||
__nmk_gpio_make_input(nmk_chip, offset);
|
||||
__nmk_gpio_set_pull(nmk_chip, offset, pull);
|
||||
__nmk_gpio_set_slpm(nmk_chip, offset, slpm);
|
||||
__nmk_gpio_set_mode(nmk_chip, offset, af);
|
||||
}
|
||||
|
||||
/**
|
||||
* nmk_config_pin - configure a pin's mux attributes
|
||||
* @cfg: pin confguration
|
||||
*
|
||||
* Configures a pin's mode (alternate function or GPIO), its pull up status,
|
||||
* and its sleep mode based on the specified configuration. The @cfg is
|
||||
* usually one of the SoC specific macros defined in mach/<soc>-pins.h. These
|
||||
* are constructed using, and can be further enhanced with, the macros in
|
||||
* plat/pincfg.h.
|
||||
*
|
||||
* If a pin's mode is set to GPIO, it is configured as an input to avoid
|
||||
* side-effects. The gpio can be manipulated later using standard GPIO API
|
||||
* calls.
|
||||
*/
|
||||
int nmk_config_pin(pin_cfg_t cfg)
|
||||
{
|
||||
struct nmk_gpio_chip *nmk_chip;
|
||||
int gpio = PIN_NUM(cfg);
|
||||
unsigned long flags;
|
||||
|
||||
nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
|
||||
if (!nmk_chip)
|
||||
return -EINVAL;
|
||||
|
||||
spin_lock_irqsave(&nmk_chip->lock, flags);
|
||||
__nmk_config_pin(nmk_chip, gpio - nmk_chip->chip.base, cfg);
|
||||
spin_unlock_irqrestore(&nmk_chip->lock, flags);
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(nmk_config_pin);
|
||||
|
||||
/**
|
||||
* nmk_config_pins - configure several pins at once
|
||||
* @cfgs: array of pin configurations
|
||||
* @num: number of elments in the array
|
||||
*
|
||||
* Configures several pins using nmk_config_pin(). Refer to that function for
|
||||
* further information.
|
||||
*/
|
||||
int nmk_config_pins(pin_cfg_t *cfgs, int num)
|
||||
{
|
||||
int ret = 0;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < num; i++) {
|
||||
int ret = nmk_config_pin(cfgs[i]);
|
||||
if (ret)
|
||||
break;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(nmk_config_pins);
|
||||
|
||||
/**
|
||||
* nmk_gpio_set_slpm() - configure the sleep mode of a pin
|
||||
* @gpio: pin number
|
||||
|
|
|
@ -0,0 +1,72 @@
|
|||
/*
|
||||
* Copyright (C) ST-Ericsson SA 2010
|
||||
*
|
||||
* License terms: GNU General Public License, version 2
|
||||
* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
|
||||
*
|
||||
* Based on arch/arm/mach-pxa/include/mach/mfp.h:
|
||||
* Copyright (C) 2007 Marvell International Ltd.
|
||||
* eric miao <eric.miao@marvell.com>
|
||||
*/
|
||||
|
||||
#ifndef __PLAT_PINCFG_H
|
||||
#define __PLAT_PINCFG_H
|
||||
|
||||
/*
|
||||
* pin configurations are represented by 32-bit integers:
|
||||
*
|
||||
* bit 0.. 8 - Pin Number (512 Pins Maximum)
|
||||
* bit 9..10 - Alternate Function Selection
|
||||
* bit 11..12 - Pull up/down state
|
||||
* bit 13 - Sleep mode behaviour
|
||||
*
|
||||
* to facilitate the definition, the following macros are provided
|
||||
*
|
||||
* PIN_CFG_DEFAULT - default config (0):
|
||||
* pull up/down = disabled
|
||||
* sleep mode = input
|
||||
*
|
||||
* PIN_CFG - default config with alternate function
|
||||
* PIN_CFG_PULL - default config with alternate function and pull up/down
|
||||
*/
|
||||
|
||||
typedef unsigned long pin_cfg_t;
|
||||
|
||||
#define PIN_NUM_MASK 0x1ff
|
||||
#define PIN_NUM(x) ((x) & PIN_NUM_MASK)
|
||||
|
||||
#define PIN_ALT_SHIFT 9
|
||||
#define PIN_ALT_MASK (0x3 << PIN_ALT_SHIFT)
|
||||
#define PIN_ALT(x) (((x) & PIN_ALT_MASK) >> PIN_ALT_SHIFT)
|
||||
#define PIN_GPIO (NMK_GPIO_ALT_GPIO << PIN_ALT_SHIFT)
|
||||
#define PIN_ALT_A (NMK_GPIO_ALT_A << PIN_ALT_SHIFT)
|
||||
#define PIN_ALT_B (NMK_GPIO_ALT_B << PIN_ALT_SHIFT)
|
||||
#define PIN_ALT_C (NMK_GPIO_ALT_C << PIN_ALT_SHIFT)
|
||||
|
||||
#define PIN_PULL_SHIFT 11
|
||||
#define PIN_PULL_MASK (0x3 << PIN_PULL_SHIFT)
|
||||
#define PIN_PULL(x) (((x) & PIN_PULL_MASK) >> PIN_PULL_SHIFT)
|
||||
#define PIN_PULL_NONE (NMK_GPIO_PULL_NONE << PIN_PULL_SHIFT)
|
||||
#define PIN_PULL_UP (NMK_GPIO_PULL_UP << PIN_PULL_SHIFT)
|
||||
#define PIN_PULL_DOWN (NMK_GPIO_PULL_DOWN << PIN_PULL_SHIFT)
|
||||
|
||||
#define PIN_SLPM_SHIFT 13
|
||||
#define PIN_SLPM_MASK (0x1 << PIN_SLPM_SHIFT)
|
||||
#define PIN_SLPM(x) (((x) & PIN_SLPM_MASK) >> PIN_SLPM_SHIFT)
|
||||
#define PIN_SLPM_INPUT (NMK_GPIO_SLPM_INPUT << PIN_SLPM_SHIFT)
|
||||
#define PIN_SLPM_NOCHANGE (NMK_GPIO_SLPM_NOCHANGE << PIN_SLPM_SHIFT)
|
||||
|
||||
#define PIN_CFG_DEFAULT (PIN_PULL_NONE | PIN_SLPM_INPUT)
|
||||
|
||||
#define PIN_CFG(num, alt) \
|
||||
(PIN_CFG_DEFAULT |\
|
||||
(PIN_NUM(num) | PIN_##alt))
|
||||
|
||||
#define PIN_CFG_PULL(num, alt, pull) \
|
||||
((PIN_CFG_DEFAULT & ~PIN_PULL_MASK) |\
|
||||
(PIN_NUM(num) | PIN_##alt | PIN_PULL_##pull))
|
||||
|
||||
extern int nmk_config_pin(pin_cfg_t cfg);
|
||||
extern int nmk_config_pins(pin_cfg_t *cfgs, int num);
|
||||
|
||||
#endif
|
Loading…
Reference in New Issue