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[ARM] 4590/1: ns9xxx: add gpio handling functions
This implementation conforms to the general GPIO API introduced in 2.6.21. This patch was signed-of by David Brownell before I exported the functions using EXPORT_SYMBOL. Signed-off-by: Uwe Kleine-König <ukleinek@informatik.uni-freiburg.de> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Uwe Kleine-König
Russell King
parent
ba7d850a02
commit
689f2a01e6
4 changed files with 233 additions and 1 deletions
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@ -318,6 +318,7 @@ config ARCH_KS8695
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config ARCH_NS9XXX
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bool "NetSilicon NS9xxx"
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select GENERIC_GPIO
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help
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Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
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System.
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@ -1,4 +1,4 @@
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obj-y := irq.o time.o generic.o
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obj-y := irq.o time.o generic.o gpio.o
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obj-$(CONFIG_MACH_CC9P9360DEV) += mach-cc9p9360dev.o
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obj-$(CONFIG_MACH_CC9P9360JS) += mach-cc9p9360js.o
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184
arch/arm/mach-ns9xxx/gpio.c
Normal file
184
arch/arm/mach-ns9xxx/gpio.c
Normal file
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@ -0,0 +1,184 @@
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/*
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* arch/arm/mach-ns9xxx/gpio.c
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*
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* Copyright (C) 2006 by Digi International Inc.
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#include <linux/compiler.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include <asm/arch-ns9xxx/gpio.h>
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#include <asm/arch-ns9xxx/processor.h>
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#include <asm/arch-ns9xxx/regs-bbu.h>
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#include <asm/bug.h>
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#include <asm/types.h>
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#include <asm/bitops.h>
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#if defined(CONFIG_PROCESSOR_NS9360)
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#define GPIO_MAX 72
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#elif defined(CONFIG_PROCESSOR_NS9750)
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#define GPIO_MAX 49
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#endif
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/* protects BBU_GCONFx and BBU_GCTRLx */
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static spinlock_t gpio_lock = __SPIN_LOCK_UNLOCKED(gpio_lock);
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/* only access gpiores with atomic ops */
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static DECLARE_BITMAP(gpiores, GPIO_MAX);
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static inline int ns9xxx_valid_gpio(unsigned gpio)
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{
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#if defined(CONFIG_PROCESSOR_NS9360)
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if (processor_is_ns9360())
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return gpio <= 72;
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else
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#endif
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#if defined(CONFIG_PROCESSOR_NS9750)
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if (processor_is_ns9750())
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return gpio <= 49;
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else
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#endif
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BUG();
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}
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static inline volatile u32 *ns9xxx_gpio_get_gconfaddr(unsigned gpio)
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{
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if (gpio < 56)
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return &BBU_GCONFb1(gpio / 8);
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else
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/*
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* this could be optimised away on
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* ns9750 only builds, but it isn't ...
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*/
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return &BBU_GCONFb2((gpio - 56) / 8);
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}
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static inline volatile u32 *ns9xxx_gpio_get_gctrladdr(unsigned gpio)
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{
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if (gpio < 32)
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return &BBU_GCTRL1;
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else if (gpio < 64)
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return &BBU_GCTRL2;
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else
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/* this could be optimised away on ns9750 only builds */
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return &BBU_GCTRL3;
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}
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static inline volatile u32 *ns9xxx_gpio_get_gstataddr(unsigned gpio)
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{
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if (gpio < 32)
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return &BBU_GSTAT1;
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else if (gpio < 64)
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return &BBU_GSTAT2;
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else
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/* this could be optimised away on ns9750 only builds */
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return &BBU_GSTAT3;
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}
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int gpio_request(unsigned gpio, const char *label)
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{
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if (likely(ns9xxx_valid_gpio(gpio)))
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return test_and_set_bit(gpio, gpiores) ? -EBUSY : 0;
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else
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return -EINVAL;
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}
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EXPORT_SYMBOL(gpio_request);
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void gpio_free(unsigned gpio)
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{
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clear_bit(gpio, gpiores);
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return;
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}
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EXPORT_SYMBOL(gpio_free);
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/*
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* each gpio can serve for 4 different purposes [0..3]. These are called
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* "functions" and passed in the parameter func. Functions 0-2 are always some
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* special things, function 3 is GPIO. If func == 3 dir specifies input or
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* output, and with inv you can enable an inverter (independent of func).
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*/
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static int __ns9xxx_gpio_configure(unsigned gpio, int dir, int inv, int func)
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{
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volatile u32 *conf = ns9xxx_gpio_get_gconfaddr(gpio);
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u32 confval;
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unsigned long flags;
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spin_lock_irqsave(&gpio_lock, flags);
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confval = *conf;
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REGSETIM_IDX(confval, BBU_GCONFx, DIR, gpio & 7, dir);
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REGSETIM_IDX(confval, BBU_GCONFx, INV, gpio & 7, inv);
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REGSETIM_IDX(confval, BBU_GCONFx, FUNC, gpio & 7, func);
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*conf = confval;
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spin_unlock_irqrestore(&gpio_lock, flags);
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return 0;
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}
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int ns9xxx_gpio_configure(unsigned gpio, int inv, int func)
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{
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if (likely(ns9xxx_valid_gpio(gpio))) {
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if (func == 3) {
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printk(KERN_WARNING "use gpio_direction_input "
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"or gpio_direction_output\n");
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return -EINVAL;
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} else
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return __ns9xxx_gpio_configure(gpio, 0, inv, func);
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} else
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return -EINVAL;
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}
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EXPORT_SYMBOL(ns9xxx_gpio_configure);
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int gpio_direction_input(unsigned gpio)
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{
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if (likely(ns9xxx_valid_gpio(gpio))) {
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return __ns9xxx_gpio_configure(gpio, 0, 0, 3);
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} else
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return -EINVAL;
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}
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EXPORT_SYMBOL(gpio_direction_input);
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int gpio_direction_output(unsigned gpio, int value)
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{
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if (likely(ns9xxx_valid_gpio(gpio))) {
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gpio_set_value(gpio, value);
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return __ns9xxx_gpio_configure(gpio, 1, 0, 3);
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} else
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return -EINVAL;
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}
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EXPORT_SYMBOL(gpio_direction_output);
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int gpio_get_value(unsigned gpio)
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{
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volatile u32 *stat = ns9xxx_gpio_get_gstataddr(gpio);
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int ret;
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ret = 1 & (*stat >> (gpio & 31));
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return ret;
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}
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EXPORT_SYMBOL(gpio_get_value);
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void gpio_set_value(unsigned gpio, int value)
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{
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volatile u32 *ctrl = ns9xxx_gpio_get_gctrladdr(gpio);
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unsigned long flags;
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spin_lock_irqsave(&gpio_lock, flags);
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if (value)
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*ctrl |= 1 << (gpio & 31);
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else
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*ctrl &= ~(1 << (gpio & 31));
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spin_unlock_irqrestore(&gpio_lock, flags);
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}
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EXPORT_SYMBOL(gpio_set_value);
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47
include/asm-arm/arch-ns9xxx/gpio.h
Normal file
47
include/asm-arm/arch-ns9xxx/gpio.h
Normal file
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@ -0,0 +1,47 @@
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/*
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* include/asm-arm/arch-ns9xxx/gpio.h
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*
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* Copyright (C) 2007 by Digi International Inc.
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#ifndef __ASM_ARCH_GPIO_H
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#define __ASM_ARCH_GPIO_H
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#include <asm/errno.h>
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int gpio_request(unsigned gpio, const char *label);
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void gpio_free(unsigned gpio);
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int ns9xxx_gpio_configure(unsigned gpio, int inv, int func);
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int gpio_direction_input(unsigned gpio);
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int gpio_direction_output(unsigned gpio, int value);
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int gpio_get_value(unsigned gpio);
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void gpio_set_value(unsigned gpio, int value);
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/*
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* ns9xxx can use gpio pins to trigger an irq, but it's not generic
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* enough to be supported by the gpio_to_irq/irq_to_gpio interface
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*/
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static inline int gpio_to_irq(unsigned gpio)
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{
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return -EINVAL;
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}
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static inline int irq_to_gpio(unsigned irq)
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{
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return -EINVAL;
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}
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/* get the cansleep() stubs */
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#include <asm-generic/gpio.h>
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#endif /* ifndef __ASM_ARCH_GPIO_H */
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