ARM: ux500: implement pin API (339bcf3b) · Commits · 戴 / test

arch/arm/mach-ux500/Makefile

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		@@ -3,7 +3,7 @@
		#

		obj-y := clock.o cpu.o devices.o devices-common.o \
		id.o usb.o timer.o
		id.o pins.o usb.o timer.o
		obj-$(CONFIG_CACHE_L2X0) += cache-l2x0.o
		obj-$(CONFIG_UX500_SOC_DB5500) += cpu-db5500.o dma-db5500.o
		obj-$(CONFIG_UX500_SOC_DB8500) += cpu-db8500.o devices-db8500.o

arch/arm/mach-ux500/board-mop500-pins.c

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		@@ -14,6 +14,7 @@
		#include <mach/hardware.h>

		#include "pins-db8500.h"
		#include "pins.h"

		static pin_cfg_t mop500_pins_common[] = {
		/* I2C */

arch/arm/mach-ux500/pins.c

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		/*
		* Copyright (C) ST-Ericsson SA 2010
		*
		* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
		* License terms: GNU General Public License (GPL), version 2
		*/

		#include <linux/kernel.h>
		#include <linux/string.h>
		#include <linux/device.h>
		#include <linux/mutex.h>
		#include <linux/spinlock.h>
		#include <linux/err.h>
		#include <plat/pincfg.h>

		#include "pins.h"

		static LIST_HEAD(pin_lookups);
		static DEFINE_MUTEX(pin_lookups_mutex);
		static DEFINE_SPINLOCK(pins_lock);

		void __init ux500_pins_add(struct ux500_pin_lookup *pl, size_t num)
		{
		mutex_lock(&pin_lookups_mutex);

		while (num--) {
		list_add_tail(&pl->node, &pin_lookups);
		pl++;
		}

		mutex_unlock(&pin_lookups_mutex);
		}

		struct ux500_pins ux500_pins_get(const char name)
		{
		struct ux500_pins *pins = NULL;
		struct ux500_pin_lookup *pl;

		mutex_lock(&pin_lookups_mutex);

		list_for_each_entry(pl, &pin_lookups, node) {
		if (!strcmp(pl->name, name)) {
		pins = pl->pins;
		goto out;
		}
		}

		out:
		mutex_unlock(&pin_lookups_mutex);
		return pins;
		}

		int ux500_pins_enable(struct ux500_pins *pins)
		{
		unsigned long flags;
		int ret = 0;

		spin_lock_irqsave(&pins_lock, flags);

		if (pins->usage++ == 0)
		ret = nmk_config_pins(pins->cfg, pins->num);

		spin_unlock_irqrestore(&pins_lock, flags);
		return ret;
		}

		int ux500_pins_disable(struct ux500_pins *pins)
		{
		unsigned long flags;
		int ret = 0;

		spin_lock_irqsave(&pins_lock, flags);

		if (WARN_ON(pins->usage == 0))
		goto out;

		if (--pins->usage == 0)
		ret = nmk_config_pins_sleep(pins->cfg, pins->num);

		out:
		spin_unlock_irqrestore(&pins_lock, flags);
		return ret;
		}

		void ux500_pins_put(struct ux500_pins *pins)
		{
		WARN_ON(!pins);
		}

arch/arm/mach-ux500/pins.h

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		/*
		* Copyright (C) ST-Ericsson SA 2010
		*
		* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
		* License terms: GNU General Public License (GPL), version 2
		*/

		#ifndef __MACH_UX500_PINS_H
		#define __MACH_UX500_PINS_H

		#include <linux/list.h>
		#include <plat/pincfg.h>

		#define PIN_LOOKUP(_name, _pins) \
		{ \
		.name = _name, \
		.pins = _pins, \
		}

		#define UX500_PINS(name, pins...) \
		struct ux500_pins name = { \
		.cfg = (pin_cfg_t[]) {pins}, \
		.num = ARRAY_SIZE(((pin_cfg_t[]) {pins})), \
		}

		struct ux500_pins {
		int usage;
		int num;
		pin_cfg_t *cfg;
		};

		struct ux500_pin_lookup {
		struct list_head node;
		const char *name;
		struct ux500_pins *pins;
		};

		void __init ux500_pins_add(struct ux500_pin_lookup *pl, size_t num);
		void __init ux500_offchip_gpio_init(struct ux500_pins *pins);
		struct ux500_pins ux500_pins_get(const char name);
		int ux500_pins_enable(struct ux500_pins *pins);
		int ux500_pins_disable(struct ux500_pins *pins);
		void ux500_pins_put(struct ux500_pins *pins);
		int pins_for_u9500(void);

		#endif

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