diff options
Diffstat (limited to 'arch/arm/mach-ns9xxx/gpio.c')
| -rw-r--r-- | arch/arm/mach-ns9xxx/gpio.c | 190 |
1 files changed, 0 insertions, 190 deletions
diff --git a/arch/arm/mach-ns9xxx/gpio.c b/arch/arm/mach-ns9xxx/gpio.c deleted file mode 100644 index b2230213b98..00000000000 --- a/arch/arm/mach-ns9xxx/gpio.c +++ /dev/null @@ -1,190 +0,0 @@ -/* - * arch/arm/mach-ns9xxx/gpio.c - * - * Copyright (C) 2006 by Digi International Inc. - * All rights reserved. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 as published by - * the Free Software Foundation. - */ -#include <linux/compiler.h> -#include <linux/init.h> -#include <linux/spinlock.h> -#include <linux/module.h> - -#include <asm/arch-ns9xxx/gpio.h> -#include <asm/arch-ns9xxx/processor.h> -#include <asm/arch-ns9xxx/regs-bbu.h> -#include <asm/io.h> -#include <asm/bug.h> -#include <asm/types.h> -#include <asm/bitops.h> - -#if defined(CONFIG_PROCESSOR_NS9360) -#define GPIO_MAX 72 -#elif defined(CONFIG_PROCESSOR_NS9750) -#define GPIO_MAX 49 -#endif - -/* protects BBU_GCONFx and BBU_GCTRLx */ -static spinlock_t gpio_lock = __SPIN_LOCK_UNLOCKED(gpio_lock); - -/* only access gpiores with atomic ops */ -static DECLARE_BITMAP(gpiores, GPIO_MAX); - -static inline int ns9xxx_valid_gpio(unsigned gpio) -{ -#if defined(CONFIG_PROCESSOR_NS9360) - if (processor_is_ns9360()) - return gpio <= 72; - else -#endif -#if defined(CONFIG_PROCESSOR_NS9750) - if (processor_is_ns9750()) - return gpio <= 49; - else -#endif - BUG(); -} - -static inline void __iomem *ns9xxx_gpio_get_gconfaddr(unsigned gpio) -{ - if (gpio < 56) - return BBU_GCONFb1(gpio / 8); - else - /* - * this could be optimised away on - * ns9750 only builds, but it isn't ... - */ - return BBU_GCONFb2((gpio - 56) / 8); -} - -static inline void __iomem *ns9xxx_gpio_get_gctrladdr(unsigned gpio) -{ - if (gpio < 32) - return BBU_GCTRL1; - else if (gpio < 64) - return BBU_GCTRL2; - else - /* this could be optimised away on ns9750 only builds */ - return BBU_GCTRL3; -} - -static inline void __iomem *ns9xxx_gpio_get_gstataddr(unsigned gpio) -{ - if (gpio < 32) - return BBU_GSTAT1; - else if (gpio < 64) - return BBU_GSTAT2; - else - /* this could be optimised away on ns9750 only builds */ - return BBU_GSTAT3; -} - -int gpio_request(unsigned gpio, const char *label) -{ - if (likely(ns9xxx_valid_gpio(gpio))) - return test_and_set_bit(gpio, gpiores) ? -EBUSY : 0; - else - return -EINVAL; -} -EXPORT_SYMBOL(gpio_request); - -void gpio_free(unsigned gpio) -{ - clear_bit(gpio, gpiores); - return; -} -EXPORT_SYMBOL(gpio_free); - -/* - * each gpio can serve for 4 different purposes [0..3]. These are called - * "functions" and passed in the parameter func. Functions 0-2 are always some - * special things, function 3 is GPIO. If func == 3 dir specifies input or - * output, and with inv you can enable an inverter (independent of func). - */ -static int __ns9xxx_gpio_configure(unsigned gpio, int dir, int inv, int func) -{ - void __iomem *conf = ns9xxx_gpio_get_gconfaddr(gpio); - u32 confval; - unsigned long flags; - - spin_lock_irqsave(&gpio_lock, flags); - - confval = __raw_readl(conf); - REGSETIM_IDX(confval, BBU_GCONFx, DIR, gpio & 7, dir); - REGSETIM_IDX(confval, BBU_GCONFx, INV, gpio & 7, inv); - REGSETIM_IDX(confval, BBU_GCONFx, FUNC, gpio & 7, func); - __raw_writel(confval, conf); - - spin_unlock_irqrestore(&gpio_lock, flags); - - return 0; -} - -int ns9xxx_gpio_configure(unsigned gpio, int inv, int func) -{ - if (likely(ns9xxx_valid_gpio(gpio))) { - if (func == 3) { - printk(KERN_WARNING "use gpio_direction_input " - "or gpio_direction_output\n"); - return -EINVAL; - } else - return __ns9xxx_gpio_configure(gpio, 0, inv, func); - } else - return -EINVAL; -} -EXPORT_SYMBOL(ns9xxx_gpio_configure); - -int gpio_direction_input(unsigned gpio) -{ - if (likely(ns9xxx_valid_gpio(gpio))) { - return __ns9xxx_gpio_configure(gpio, 0, 0, 3); - } else - return -EINVAL; -} -EXPORT_SYMBOL(gpio_direction_input); - -int gpio_direction_output(unsigned gpio, int value) -{ - if (likely(ns9xxx_valid_gpio(gpio))) { - gpio_set_value(gpio, value); - - return __ns9xxx_gpio_configure(gpio, 1, 0, 3); - } else - return -EINVAL; -} -EXPORT_SYMBOL(gpio_direction_output); - -int gpio_get_value(unsigned gpio) -{ - void __iomem *stat = ns9xxx_gpio_get_gstataddr(gpio); - int ret; - - ret = 1 & (__raw_readl(stat) >> (gpio & 31)); - - return ret; -} -EXPORT_SYMBOL(gpio_get_value); - -void gpio_set_value(unsigned gpio, int value) -{ - void __iomem *ctrl = ns9xxx_gpio_get_gctrladdr(gpio); - u32 ctrlval; - unsigned long flags; - - spin_lock_irqsave(&gpio_lock, flags); - - ctrlval = __raw_readl(ctrl); - - if (value) - ctrlval |= 1 << (gpio & 31); - else - ctrlval &= ~(1 << (gpio & 31)); - - __raw_writel(ctrlval, ctrl); - - spin_unlock_irqrestore(&gpio_lock, flags); -} -EXPORT_SYMBOL(gpio_set_value); |