From patchwork Fri May 20 22:05:21 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Linus Walleij X-Patchwork-Id: 1564 Return-Path: Delivered-To: unknown Received: from imap.gmail.com (74.125.159.109) by localhost6.localdomain6 with IMAP4-SSL; 08 Jun 2011 14:53:10 -0000 Delivered-To: patches@linaro.org Received: by 10.224.54.134 with SMTP id q6cs178420qag; Fri, 20 May 2011 15:05:46 -0700 (PDT) Received: by 10.14.27.193 with SMTP id e41mr35818eea.42.1305929145381; Fri, 20 May 2011 15:05:45 -0700 (PDT) Received: from eu1sys200aog116.obsmtp.com (eu1sys200aog116.obsmtp.com [207.126.144.141]) by mx.google.com with SMTP id y14si4016945eeh.55.2011.05.20.15.05.38 (version=TLSv1/SSLv3 cipher=OTHER); Fri, 20 May 2011 15:05:45 -0700 (PDT) Received-SPF: neutral (google.com: 207.126.144.141 is neither permitted nor denied by best guess record for domain of linus.walleij@stericsson.com) client-ip=207.126.144.141; Authentication-Results: mx.google.com; spf=neutral (google.com: 207.126.144.141 is neither permitted nor denied by best guess record for domain of linus.walleij@stericsson.com) smtp.mail=linus.walleij@stericsson.com Received: from beta.dmz-us.st.com ([167.4.1.35]) (using TLSv1) by eu1sys200aob116.postini.com ([207.126.147.11]) with SMTP ID DSNKTdblsg/IMsxF/v7oH3EZbZ75rBpxOMWx@postini.com; Fri, 20 May 2011 22:05:44 UTC Received: from zeta.dmz-us.st.com (ns4.st.com [167.4.16.71]) by beta.dmz-us.st.com (STMicroelectronics) with ESMTP id B41333F; Fri, 20 May 2011 22:05:26 +0000 (GMT) Received: from relay2.stm.gmessaging.net (unknown [10.230.100.18]) by zeta.dmz-us.st.com (STMicroelectronics) with ESMTP id ADE0775; Fri, 20 May 2011 22:05:25 +0000 (GMT) Received: from exdcvycastm004.EQ1STM.local (alteon-source-exch [10.230.100.61]) (using TLSv1 with cipher RC4-MD5 (128/128 bits)) (Client CN "exdcvycastm004", Issuer "exdcvycastm004" (not verified)) by relay2.stm.gmessaging.net (Postfix) with ESMTPS id 5BB98A8065; Sat, 21 May 2011 00:05:25 +0200 (CEST) Received: from localhost.localdomain (10.230.100.153) by smtp.stericsson.com (10.230.100.2) with Microsoft SMTP Server (TLS) id 8.3.83.0; Sat, 21 May 2011 00:05:25 +0200 From: Linus Walleij To: Grant Likely , , Cc: Lee Jones , Linus Walleij Subject: [PATCH 2/4] gpio: move Nomadik GPIO driver to drivers/gpio Date: Sat, 21 May 2011 00:05:21 +0200 Message-ID: <1305929121-9079-1-git-send-email-linus.walleij@stericsson.com> X-Mailer: git-send-email 1.7.3.2 MIME-Version: 1.0 From: Linus Walleij This moves the Nomadik GPIO driver out of arch/arm/plat-nomadik and into the desired location indicated by the subsystem maintainer. Signed-off-by: Linus Walleij --- arch/arm/plat-nomadik/Kconfig | 5 - arch/arm/plat-nomadik/Makefile | 1 - arch/arm/plat-nomadik/gpio.c | 1024 ---------------------------------------- drivers/gpio/Makefile | 1 + drivers/gpio/gpio-nomadik.c | 1024 ++++++++++++++++++++++++++++++++++++++++ 5 files changed, 1025 insertions(+), 1030 deletions(-) delete mode 100644 arch/arm/plat-nomadik/gpio.c create mode 100644 drivers/gpio/gpio-nomadik.c diff --git a/arch/arm/plat-nomadik/Kconfig b/arch/arm/plat-nomadik/Kconfig index 187f4e8..d5c7986 100644 --- a/arch/arm/plat-nomadik/Kconfig +++ b/arch/arm/plat-nomadik/Kconfig @@ -20,9 +20,4 @@ config HAS_MTU to multiple interrupt generating programmable 32-bit free running decrementing counters. -config NOMADIK_GPIO - bool - help - Support for the Nomadik GPIO controller. - endif diff --git a/arch/arm/plat-nomadik/Makefile b/arch/arm/plat-nomadik/Makefile index c335473..37c7cdd 100644 --- a/arch/arm/plat-nomadik/Makefile +++ b/arch/arm/plat-nomadik/Makefile @@ -3,4 +3,3 @@ # Licensed under GPLv2 obj-$(CONFIG_HAS_MTU) += timer.o -obj-$(CONFIG_NOMADIK_GPIO) += gpio.o diff --git a/arch/arm/plat-nomadik/gpio.c b/arch/arm/plat-nomadik/gpio.c deleted file mode 100644 index f49748e..0000000 --- a/arch/arm/plat-nomadik/gpio.c +++ /dev/null @@ -1,1024 +0,0 @@ -/* - * Generic GPIO driver for logic cells found in the Nomadik SoC - * - * Copyright (C) 2008,2009 STMicroelectronics - * Copyright (C) 2009 Alessandro Rubini - * Rewritten based on work by Prafulla WADASKAR - * - * 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 -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include - -/* - * The GPIO module in the Nomadik family of Systems-on-Chip is an - * AMBA device, managing 32 pins and alternate functions. The logic block - * is currently used in the Nomadik and ux500. - * - * Symbols in this file are called "nmk_gpio" for "nomadik gpio" - */ - -#define NMK_GPIO_PER_CHIP 32 - -struct nmk_gpio_chip { - struct gpio_chip chip; - void __iomem *addr; - struct clk *clk; - unsigned int bank; - unsigned int parent_irq; - int secondary_parent_irq; - u32 (*get_secondary_status)(unsigned int bank); - void (*set_ioforce)(bool enable); - spinlock_t lock; - /* Keep track of configured edges */ - u32 edge_rising; - u32 edge_falling; - u32 real_wake; - u32 rwimsc; - u32 fwimsc; - u32 slpm; - u32 enabled; -}; - -static struct nmk_gpio_chip * -nmk_gpio_chips[DIV_ROUND_UP(ARCH_NR_GPIOS, NMK_GPIO_PER_CHIP)]; - -static DEFINE_SPINLOCK(nmk_gpio_slpm_lock); - -#define NUM_BANKS ARRAY_SIZE(nmk_gpio_chips) - -static void __nmk_gpio_set_mode(struct nmk_gpio_chip *nmk_chip, - unsigned offset, int gpio_mode) -{ - u32 bit = 1 << offset; - u32 afunc, bfunc; - - afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & ~bit; - bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & ~bit; - if (gpio_mode & NMK_GPIO_ALT_A) - afunc |= bit; - if (gpio_mode & NMK_GPIO_ALT_B) - bfunc |= bit; - writel(afunc, nmk_chip->addr + NMK_GPIO_AFSLA); - writel(bfunc, nmk_chip->addr + NMK_GPIO_AFSLB); -} - -static void __nmk_gpio_set_slpm(struct nmk_gpio_chip *nmk_chip, - unsigned offset, enum nmk_gpio_slpm mode) -{ - u32 bit = 1 << offset; - u32 slpm; - - slpm = readl(nmk_chip->addr + NMK_GPIO_SLPC); - if (mode == NMK_GPIO_SLPM_NOCHANGE) - slpm |= bit; - else - slpm &= ~bit; - writel(slpm, nmk_chip->addr + NMK_GPIO_SLPC); -} - -static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip, - unsigned offset, enum nmk_gpio_pull pull) -{ - u32 bit = 1 << offset; - u32 pdis; - - pdis = readl(nmk_chip->addr + NMK_GPIO_PDIS); - if (pull == NMK_GPIO_PULL_NONE) - pdis |= bit; - else - pdis &= ~bit; - writel(pdis, nmk_chip->addr + NMK_GPIO_PDIS); - - if (pull == NMK_GPIO_PULL_UP) - writel(bit, nmk_chip->addr + NMK_GPIO_DATS); - else if (pull == NMK_GPIO_PULL_DOWN) - 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_gpio_set_output(struct nmk_gpio_chip *nmk_chip, - unsigned offset, int val) -{ - if (val) - writel(1 << offset, nmk_chip->addr + NMK_GPIO_DATS); - else - writel(1 << offset, nmk_chip->addr + NMK_GPIO_DATC); -} - -static void __nmk_gpio_make_output(struct nmk_gpio_chip *nmk_chip, - unsigned offset, int val) -{ - writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRS); - __nmk_gpio_set_output(nmk_chip, offset, val); -} - -static void __nmk_gpio_set_mode_safe(struct nmk_gpio_chip *nmk_chip, - unsigned offset, int gpio_mode, - bool glitch) -{ - u32 rwimsc = readl(nmk_chip->addr + NMK_GPIO_RWIMSC); - u32 fwimsc = readl(nmk_chip->addr + NMK_GPIO_FWIMSC); - - if (glitch && nmk_chip->set_ioforce) { - u32 bit = BIT(offset); - - /* Prevent spurious wakeups */ - writel(rwimsc & ~bit, nmk_chip->addr + NMK_GPIO_RWIMSC); - writel(fwimsc & ~bit, nmk_chip->addr + NMK_GPIO_FWIMSC); - - nmk_chip->set_ioforce(true); - } - - __nmk_gpio_set_mode(nmk_chip, offset, gpio_mode); - - if (glitch && nmk_chip->set_ioforce) { - nmk_chip->set_ioforce(false); - - writel(rwimsc, nmk_chip->addr + NMK_GPIO_RWIMSC); - writel(fwimsc, nmk_chip->addr + NMK_GPIO_FWIMSC); - } -} - -static void __nmk_config_pin(struct nmk_gpio_chip *nmk_chip, unsigned offset, - pin_cfg_t cfg, bool sleep, unsigned int *slpmregs) -{ - 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/wakeup", - [NMK_GPIO_SLPM_NOCHANGE] = "no-change/no-wakeup", - }; - - int pin = PIN_NUM(cfg); - int pull = PIN_PULL(cfg); - int af = PIN_ALT(cfg); - int slpm = PIN_SLPM(cfg); - int output = PIN_DIR(cfg); - int val = PIN_VAL(cfg); - bool glitch = af == NMK_GPIO_ALT_C; - - dev_dbg(nmk_chip->chip.dev, "pin %d [%#lx]: af %s, pull %s, slpm %s (%s%s)\n", - pin, cfg, afnames[af], pullnames[pull], slpmnames[slpm], - output ? "output " : "input", - output ? (val ? "high" : "low") : ""); - - if (sleep) { - int slpm_pull = PIN_SLPM_PULL(cfg); - int slpm_output = PIN_SLPM_DIR(cfg); - int slpm_val = PIN_SLPM_VAL(cfg); - - af = NMK_GPIO_ALT_GPIO; - - /* - * The SLPM_* values are normal values + 1 to allow zero to - * mean "same as normal". - */ - if (slpm_pull) - pull = slpm_pull - 1; - if (slpm_output) - output = slpm_output - 1; - if (slpm_val) - val = slpm_val - 1; - - dev_dbg(nmk_chip->chip.dev, "pin %d: sleep pull %s, dir %s, val %s\n", - pin, - slpm_pull ? pullnames[pull] : "same", - slpm_output ? (output ? "output" : "input") : "same", - slpm_val ? (val ? "high" : "low") : "same"); - } - - if (output) - __nmk_gpio_make_output(nmk_chip, offset, val); - else { - __nmk_gpio_make_input(nmk_chip, offset); - __nmk_gpio_set_pull(nmk_chip, offset, pull); - } - - /* - * If we've backed up the SLPM registers (glitch workaround), modify - * the backups since they will be restored. - */ - if (slpmregs) { - if (slpm == NMK_GPIO_SLPM_NOCHANGE) - slpmregs[nmk_chip->bank] |= BIT(offset); - else - slpmregs[nmk_chip->bank] &= ~BIT(offset); - } else - __nmk_gpio_set_slpm(nmk_chip, offset, slpm); - - __nmk_gpio_set_mode_safe(nmk_chip, offset, af, glitch); -} - -/* - * Safe sequence used to switch IOs between GPIO and Alternate-C mode: - * - Save SLPM registers - * - Set SLPM=0 for the IOs you want to switch and others to 1 - * - Configure the GPIO registers for the IOs that are being switched - * - Set IOFORCE=1 - * - Modify the AFLSA/B registers for the IOs that are being switched - * - Set IOFORCE=0 - * - Restore SLPM registers - * - Any spurious wake up event during switch sequence to be ignored and - * cleared - */ -static void nmk_gpio_glitch_slpm_init(unsigned int *slpm) -{ - int i; - - for (i = 0; i < NUM_BANKS; i++) { - struct nmk_gpio_chip *chip = nmk_gpio_chips[i]; - unsigned int temp = slpm[i]; - - if (!chip) - break; - - slpm[i] = readl(chip->addr + NMK_GPIO_SLPC); - writel(temp, chip->addr + NMK_GPIO_SLPC); - } -} - -static void nmk_gpio_glitch_slpm_restore(unsigned int *slpm) -{ - int i; - - for (i = 0; i < NUM_BANKS; i++) { - struct nmk_gpio_chip *chip = nmk_gpio_chips[i]; - - if (!chip) - break; - - writel(slpm[i], chip->addr + NMK_GPIO_SLPC); - } -} - -static int __nmk_config_pins(pin_cfg_t *cfgs, int num, bool sleep) -{ - static unsigned int slpm[NUM_BANKS]; - unsigned long flags; - bool glitch = false; - int ret = 0; - int i; - - for (i = 0; i < num; i++) { - if (PIN_ALT(cfgs[i]) == NMK_GPIO_ALT_C) { - glitch = true; - break; - } - } - - spin_lock_irqsave(&nmk_gpio_slpm_lock, flags); - - if (glitch) { - memset(slpm, 0xff, sizeof(slpm)); - - for (i = 0; i < num; i++) { - int pin = PIN_NUM(cfgs[i]); - int offset = pin % NMK_GPIO_PER_CHIP; - - if (PIN_ALT(cfgs[i]) == NMK_GPIO_ALT_C) - slpm[pin / NMK_GPIO_PER_CHIP] &= ~BIT(offset); - } - - nmk_gpio_glitch_slpm_init(slpm); - } - - for (i = 0; i < num; i++) { - struct nmk_gpio_chip *nmk_chip; - int pin = PIN_NUM(cfgs[i]); - - nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(pin)); - if (!nmk_chip) { - ret = -EINVAL; - break; - } - - spin_lock(&nmk_chip->lock); - __nmk_config_pin(nmk_chip, pin - nmk_chip->chip.base, - cfgs[i], sleep, glitch ? slpm : NULL); - spin_unlock(&nmk_chip->lock); - } - - if (glitch) - nmk_gpio_glitch_slpm_restore(slpm); - - spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags); - - return ret; -} - -/** - * 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/-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, bool sleep) -{ - return __nmk_config_pins(&cfg, 1, sleep); -} -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) -{ - return __nmk_config_pins(cfgs, num, false); -} -EXPORT_SYMBOL(nmk_config_pins); - -int nmk_config_pins_sleep(pin_cfg_t *cfgs, int num) -{ - return __nmk_config_pins(cfgs, num, true); -} -EXPORT_SYMBOL(nmk_config_pins_sleep); - -/** - * nmk_gpio_set_slpm() - configure the sleep mode of a pin - * @gpio: pin number - * @mode: NMK_GPIO_SLPM_INPUT or NMK_GPIO_SLPM_NOCHANGE, - * - * Sets the sleep mode of a pin. If @mode is NMK_GPIO_SLPM_INPUT, the pin is - * changed to an input (with pullup/down enabled) in sleep and deep sleep. If - * @mode is NMK_GPIO_SLPM_NOCHANGE, the pin remains in the state it was - * configured even when in sleep and deep sleep. - * - * On DB8500v2 onwards, this setting loses the previous meaning and instead - * indicates if wakeup detection is enabled on the pin. Note that - * enable_irq_wake() will automatically enable wakeup detection. - */ -int nmk_gpio_set_slpm(int gpio, enum nmk_gpio_slpm mode) -{ - struct nmk_gpio_chip *nmk_chip; - unsigned long flags; - - nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(gpio)); - if (!nmk_chip) - return -EINVAL; - - spin_lock_irqsave(&nmk_gpio_slpm_lock, flags); - spin_lock(&nmk_chip->lock); - - __nmk_gpio_set_slpm(nmk_chip, gpio - nmk_chip->chip.base, mode); - - spin_unlock(&nmk_chip->lock); - spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags); - - return 0; -} - -/** - * nmk_gpio_set_pull() - enable/disable pull up/down on a gpio - * @gpio: pin number - * @pull: one of NMK_GPIO_PULL_DOWN, NMK_GPIO_PULL_UP, and NMK_GPIO_PULL_NONE - * - * Enables/disables pull up/down on a specified pin. This only takes effect if - * the pin is configured as an input (either explicitly or by the alternate - * function). - * - * NOTE: If enabling the pull up/down, the caller must ensure that the GPIO is - * configured as an input. Otherwise, due to the way the controller registers - * work, this function will change the value output on the pin. - */ -int nmk_gpio_set_pull(int gpio, enum nmk_gpio_pull pull) -{ - struct nmk_gpio_chip *nmk_chip; - unsigned long flags; - - nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(gpio)); - if (!nmk_chip) - return -EINVAL; - - spin_lock_irqsave(&nmk_chip->lock, flags); - __nmk_gpio_set_pull(nmk_chip, gpio - nmk_chip->chip.base, pull); - spin_unlock_irqrestore(&nmk_chip->lock, flags); - - return 0; -} - -/* Mode functions */ -/** - * nmk_gpio_set_mode() - set the mux mode of a gpio pin - * @gpio: pin number - * @gpio_mode: one of NMK_GPIO_ALT_GPIO, NMK_GPIO_ALT_A, - * NMK_GPIO_ALT_B, and NMK_GPIO_ALT_C - * - * Sets the mode of the specified pin to one of the alternate functions or - * plain GPIO. - */ -int nmk_gpio_set_mode(int gpio, int gpio_mode) -{ - struct nmk_gpio_chip *nmk_chip; - unsigned long flags; - - nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(gpio)); - if (!nmk_chip) - return -EINVAL; - - spin_lock_irqsave(&nmk_chip->lock, flags); - __nmk_gpio_set_mode(nmk_chip, gpio - nmk_chip->chip.base, gpio_mode); - spin_unlock_irqrestore(&nmk_chip->lock, flags); - - return 0; -} -EXPORT_SYMBOL(nmk_gpio_set_mode); - -int nmk_gpio_get_mode(int gpio) -{ - struct nmk_gpio_chip *nmk_chip; - u32 afunc, bfunc, bit; - - nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(gpio)); - if (!nmk_chip) - return -EINVAL; - - bit = 1 << (gpio - nmk_chip->chip.base); - - afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & bit; - bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & bit; - - return (afunc ? NMK_GPIO_ALT_A : 0) | (bfunc ? NMK_GPIO_ALT_B : 0); -} -EXPORT_SYMBOL(nmk_gpio_get_mode); - - -/* IRQ functions */ -static inline int nmk_gpio_get_bitmask(int gpio) -{ - return 1 << (gpio % 32); -} - -static void nmk_gpio_irq_ack(struct irq_data *d) -{ - int gpio; - struct nmk_gpio_chip *nmk_chip; - - gpio = NOMADIK_IRQ_TO_GPIO(d->irq); - nmk_chip = irq_data_get_irq_chip_data(d); - if (!nmk_chip) - return; - writel(nmk_gpio_get_bitmask(gpio), nmk_chip->addr + NMK_GPIO_IC); -} - -enum nmk_gpio_irq_type { - NORMAL, - WAKE, -}; - -static void __nmk_gpio_irq_modify(struct nmk_gpio_chip *nmk_chip, - int gpio, enum nmk_gpio_irq_type which, - bool enable) -{ - u32 rimsc = which == WAKE ? NMK_GPIO_RWIMSC : NMK_GPIO_RIMSC; - u32 fimsc = which == WAKE ? NMK_GPIO_FWIMSC : NMK_GPIO_FIMSC; - u32 bitmask = nmk_gpio_get_bitmask(gpio); - u32 reg; - - /* we must individually set/clear the two edges */ - if (nmk_chip->edge_rising & bitmask) { - reg = readl(nmk_chip->addr + rimsc); - if (enable) - reg |= bitmask; - else - reg &= ~bitmask; - writel(reg, nmk_chip->addr + rimsc); - } - if (nmk_chip->edge_falling & bitmask) { - reg = readl(nmk_chip->addr + fimsc); - if (enable) - reg |= bitmask; - else - reg &= ~bitmask; - writel(reg, nmk_chip->addr + fimsc); - } -} - -static void __nmk_gpio_set_wake(struct nmk_gpio_chip *nmk_chip, - int gpio, bool on) -{ - __nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, on); -} - -static int nmk_gpio_irq_maskunmask(struct irq_data *d, bool enable) -{ - int gpio; - struct nmk_gpio_chip *nmk_chip; - unsigned long flags; - u32 bitmask; - - gpio = NOMADIK_IRQ_TO_GPIO(d->irq); - nmk_chip = irq_data_get_irq_chip_data(d); - bitmask = nmk_gpio_get_bitmask(gpio); - if (!nmk_chip) - return -EINVAL; - - if (enable) - nmk_chip->enabled |= bitmask; - else - nmk_chip->enabled &= ~bitmask; - - spin_lock_irqsave(&nmk_gpio_slpm_lock, flags); - spin_lock(&nmk_chip->lock); - - __nmk_gpio_irq_modify(nmk_chip, gpio, NORMAL, enable); - - if (!(nmk_chip->real_wake & bitmask)) - __nmk_gpio_set_wake(nmk_chip, gpio, enable); - - spin_unlock(&nmk_chip->lock); - spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags); - - return 0; -} - -static void nmk_gpio_irq_mask(struct irq_data *d) -{ - nmk_gpio_irq_maskunmask(d, false); -} - -static void nmk_gpio_irq_unmask(struct irq_data *d) -{ - nmk_gpio_irq_maskunmask(d, true); -} - -static int nmk_gpio_irq_set_wake(struct irq_data *d, unsigned int on) -{ - struct nmk_gpio_chip *nmk_chip; - unsigned long flags; - u32 bitmask; - int gpio; - - gpio = NOMADIK_IRQ_TO_GPIO(d->irq); - nmk_chip = irq_data_get_irq_chip_data(d); - if (!nmk_chip) - return -EINVAL; - bitmask = nmk_gpio_get_bitmask(gpio); - - spin_lock_irqsave(&nmk_gpio_slpm_lock, flags); - spin_lock(&nmk_chip->lock); - - if (!(nmk_chip->enabled & bitmask)) - __nmk_gpio_set_wake(nmk_chip, gpio, on); - - if (on) - nmk_chip->real_wake |= bitmask; - else - nmk_chip->real_wake &= ~bitmask; - - spin_unlock(&nmk_chip->lock); - spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags); - - return 0; -} - -static int nmk_gpio_irq_set_type(struct irq_data *d, unsigned int type) -{ - bool enabled, wake = irqd_is_wakeup_set(d); - int gpio; - struct nmk_gpio_chip *nmk_chip; - unsigned long flags; - u32 bitmask; - - gpio = NOMADIK_IRQ_TO_GPIO(d->irq); - nmk_chip = irq_data_get_irq_chip_data(d); - bitmask = nmk_gpio_get_bitmask(gpio); - if (!nmk_chip) - return -EINVAL; - - if (type & IRQ_TYPE_LEVEL_HIGH) - return -EINVAL; - if (type & IRQ_TYPE_LEVEL_LOW) - return -EINVAL; - - enabled = nmk_chip->enabled & bitmask; - - spin_lock_irqsave(&nmk_chip->lock, flags); - - if (enabled) - __nmk_gpio_irq_modify(nmk_chip, gpio, NORMAL, false); - - if (enabled || wake) - __nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, false); - - nmk_chip->edge_rising &= ~bitmask; - if (type & IRQ_TYPE_EDGE_RISING) - nmk_chip->edge_rising |= bitmask; - - nmk_chip->edge_falling &= ~bitmask; - if (type & IRQ_TYPE_EDGE_FALLING) - nmk_chip->edge_falling |= bitmask; - - if (enabled) - __nmk_gpio_irq_modify(nmk_chip, gpio, NORMAL, true); - - if (enabled || wake) - __nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, true); - - spin_unlock_irqrestore(&nmk_chip->lock, flags); - - return 0; -} - -static struct irq_chip nmk_gpio_irq_chip = { - .name = "Nomadik-GPIO", - .irq_ack = nmk_gpio_irq_ack, - .irq_mask = nmk_gpio_irq_mask, - .irq_unmask = nmk_gpio_irq_unmask, - .irq_set_type = nmk_gpio_irq_set_type, - .irq_set_wake = nmk_gpio_irq_set_wake, -}; - -static void __nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc, - u32 status) -{ - struct nmk_gpio_chip *nmk_chip; - struct irq_chip *host_chip = irq_get_chip(irq); - unsigned int first_irq; - - if (host_chip->irq_mask_ack) - host_chip->irq_mask_ack(&desc->irq_data); - else { - host_chip->irq_mask(&desc->irq_data); - if (host_chip->irq_ack) - host_chip->irq_ack(&desc->irq_data); - } - - nmk_chip = irq_get_handler_data(irq); - first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base); - while (status) { - int bit = __ffs(status); - - generic_handle_irq(first_irq + bit); - status &= ~BIT(bit); - } - - host_chip->irq_unmask(&desc->irq_data); -} - -static void nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) -{ - struct nmk_gpio_chip *nmk_chip = irq_get_handler_data(irq); - u32 status = readl(nmk_chip->addr + NMK_GPIO_IS); - - __nmk_gpio_irq_handler(irq, desc, status); -} - -static void nmk_gpio_secondary_irq_handler(unsigned int irq, - struct irq_desc *desc) -{ - struct nmk_gpio_chip *nmk_chip = irq_get_handler_data(irq); - u32 status = nmk_chip->get_secondary_status(nmk_chip->bank); - - __nmk_gpio_irq_handler(irq, desc, status); -} - -static int nmk_gpio_init_irq(struct nmk_gpio_chip *nmk_chip) -{ - unsigned int first_irq; - int i; - - first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base); - for (i = first_irq; i < first_irq + nmk_chip->chip.ngpio; i++) { - irq_set_chip_and_handler(i, &nmk_gpio_irq_chip, - handle_edge_irq); - set_irq_flags(i, IRQF_VALID); - irq_set_chip_data(i, nmk_chip); - irq_set_irq_type(i, IRQ_TYPE_EDGE_FALLING); - } - - irq_set_chained_handler(nmk_chip->parent_irq, nmk_gpio_irq_handler); - irq_set_handler_data(nmk_chip->parent_irq, nmk_chip); - - if (nmk_chip->secondary_parent_irq >= 0) { - irq_set_chained_handler(nmk_chip->secondary_parent_irq, - nmk_gpio_secondary_irq_handler); - irq_set_handler_data(nmk_chip->secondary_parent_irq, nmk_chip); - } - - return 0; -} - -/* I/O Functions */ -static int nmk_gpio_make_input(struct gpio_chip *chip, unsigned offset) -{ - struct nmk_gpio_chip *nmk_chip = - container_of(chip, struct nmk_gpio_chip, chip); - - writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC); - return 0; -} - -static int nmk_gpio_get_input(struct gpio_chip *chip, unsigned offset) -{ - struct nmk_gpio_chip *nmk_chip = - container_of(chip, struct nmk_gpio_chip, chip); - u32 bit = 1 << offset; - - return (readl(nmk_chip->addr + NMK_GPIO_DAT) & bit) != 0; -} - -static void nmk_gpio_set_output(struct gpio_chip *chip, unsigned offset, - int val) -{ - struct nmk_gpio_chip *nmk_chip = - container_of(chip, struct nmk_gpio_chip, chip); - - __nmk_gpio_set_output(nmk_chip, offset, val); -} - -static int nmk_gpio_make_output(struct gpio_chip *chip, unsigned offset, - int val) -{ - struct nmk_gpio_chip *nmk_chip = - container_of(chip, struct nmk_gpio_chip, chip); - - __nmk_gpio_make_output(nmk_chip, offset, val); - - return 0; -} - -static int nmk_gpio_to_irq(struct gpio_chip *chip, unsigned offset) -{ - struct nmk_gpio_chip *nmk_chip = - container_of(chip, struct nmk_gpio_chip, chip); - - return NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base) + offset; -} - -#ifdef CONFIG_DEBUG_FS - -#include - -static void nmk_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) -{ - int mode; - unsigned i; - unsigned gpio = chip->base; - int is_out; - struct nmk_gpio_chip *nmk_chip = - container_of(chip, struct nmk_gpio_chip, chip); - const char *modes[] = { - [NMK_GPIO_ALT_GPIO] = "gpio", - [NMK_GPIO_ALT_A] = "altA", - [NMK_GPIO_ALT_B] = "altB", - [NMK_GPIO_ALT_C] = "altC", - }; - - for (i = 0; i < chip->ngpio; i++, gpio++) { - const char *label = gpiochip_is_requested(chip, i); - bool pull; - u32 bit = 1 << i; - - if (!label) - continue; - - is_out = readl(nmk_chip->addr + NMK_GPIO_DIR) & bit; - pull = !(readl(nmk_chip->addr + NMK_GPIO_PDIS) & bit); - mode = nmk_gpio_get_mode(gpio); - seq_printf(s, " gpio-%-3d (%-20.20s) %s %s %s %s", - gpio, label, - is_out ? "out" : "in ", - chip->get - ? (chip->get(chip, i) ? "hi" : "lo") - : "? ", - (mode < 0) ? "unknown" : modes[mode], - pull ? "pull" : "none"); - seq_printf(s, "\n"); - } -} - -#else -#define nmk_gpio_dbg_show NULL -#endif - -/* This structure is replicated for each GPIO block allocated at probe time */ -static struct gpio_chip nmk_gpio_template = { - .direction_input = nmk_gpio_make_input, - .get = nmk_gpio_get_input, - .direction_output = nmk_gpio_make_output, - .set = nmk_gpio_set_output, - .to_irq = nmk_gpio_to_irq, - .dbg_show = nmk_gpio_dbg_show, - .can_sleep = 0, -}; - -/* - * Called from the suspend/resume path to only keep the real wakeup interrupts - * (those that have had set_irq_wake() called on them) as wakeup interrupts, - * and not the rest of the interrupts which we needed to have as wakeups for - * cpuidle. - * - * PM ops are not used since this needs to be done at the end, after all the - * other drivers are done with their suspend callbacks. - */ -void nmk_gpio_wakeups_suspend(void) -{ - int i; - - for (i = 0; i < NUM_BANKS; i++) { - struct nmk_gpio_chip *chip = nmk_gpio_chips[i]; - - if (!chip) - break; - - chip->rwimsc = readl(chip->addr + NMK_GPIO_RWIMSC); - chip->fwimsc = readl(chip->addr + NMK_GPIO_FWIMSC); - - writel(chip->rwimsc & chip->real_wake, - chip->addr + NMK_GPIO_RWIMSC); - writel(chip->fwimsc & chip->real_wake, - chip->addr + NMK_GPIO_FWIMSC); - - if (cpu_is_u8500v2()) { - chip->slpm = readl(chip->addr + NMK_GPIO_SLPC); - - /* 0 -> wakeup enable */ - writel(~chip->real_wake, chip->addr + NMK_GPIO_SLPC); - } - } -} - -void nmk_gpio_wakeups_resume(void) -{ - int i; - - for (i = 0; i < NUM_BANKS; i++) { - struct nmk_gpio_chip *chip = nmk_gpio_chips[i]; - - if (!chip) - break; - - writel(chip->rwimsc, chip->addr + NMK_GPIO_RWIMSC); - writel(chip->fwimsc, chip->addr + NMK_GPIO_FWIMSC); - - if (cpu_is_u8500v2()) - writel(chip->slpm, chip->addr + NMK_GPIO_SLPC); - } -} - -static int __devinit nmk_gpio_probe(struct platform_device *dev) -{ - struct nmk_gpio_platform_data *pdata = dev->dev.platform_data; - struct nmk_gpio_chip *nmk_chip; - struct gpio_chip *chip; - struct resource *res; - struct clk *clk; - int secondary_irq; - int irq; - int ret; - - if (!pdata) - return -ENODEV; - - res = platform_get_resource(dev, IORESOURCE_MEM, 0); - if (!res) { - ret = -ENOENT; - goto out; - } - - irq = platform_get_irq(dev, 0); - if (irq < 0) { - ret = irq; - goto out; - } - - secondary_irq = platform_get_irq(dev, 1); - if (secondary_irq >= 0 && !pdata->get_secondary_status) { - ret = -EINVAL; - goto out; - } - - if (request_mem_region(res->start, resource_size(res), - dev_name(&dev->dev)) == NULL) { - ret = -EBUSY; - goto out; - } - - clk = clk_get(&dev->dev, NULL); - if (IS_ERR(clk)) { - ret = PTR_ERR(clk); - goto out_release; - } - - clk_enable(clk); - - nmk_chip = kzalloc(sizeof(*nmk_chip), GFP_KERNEL); - if (!nmk_chip) { - ret = -ENOMEM; - goto out_clk; - } - /* - * The virt address in nmk_chip->addr is in the nomadik register space, - * so we can simply convert the resource address, without remapping - */ - nmk_chip->bank = dev->id; - nmk_chip->clk = clk; - nmk_chip->addr = io_p2v(res->start); - nmk_chip->chip = nmk_gpio_template; - nmk_chip->parent_irq = irq; - nmk_chip->secondary_parent_irq = secondary_irq; - nmk_chip->get_secondary_status = pdata->get_secondary_status; - nmk_chip->set_ioforce = pdata->set_ioforce; - spin_lock_init(&nmk_chip->lock); - - chip = &nmk_chip->chip; - chip->base = pdata->first_gpio; - chip->ngpio = pdata->num_gpio; - chip->label = pdata->name ?: dev_name(&dev->dev); - chip->dev = &dev->dev; - chip->owner = THIS_MODULE; - - ret = gpiochip_add(&nmk_chip->chip); - if (ret) - goto out_free; - - BUG_ON(nmk_chip->bank >= ARRAY_SIZE(nmk_gpio_chips)); - - nmk_gpio_chips[nmk_chip->bank] = nmk_chip; - platform_set_drvdata(dev, nmk_chip); - - nmk_gpio_init_irq(nmk_chip); - - dev_info(&dev->dev, "Bits %i-%i at address %p\n", - nmk_chip->chip.base, nmk_chip->chip.base+31, nmk_chip->addr); - return 0; - -out_free: - kfree(nmk_chip); -out_clk: - clk_disable(clk); - clk_put(clk); -out_release: - release_mem_region(res->start, resource_size(res)); -out: - dev_err(&dev->dev, "Failure %i for GPIO %i-%i\n", ret, - pdata->first_gpio, pdata->first_gpio+31); - return ret; -} - -static struct platform_driver nmk_gpio_driver = { - .driver = { - .owner = THIS_MODULE, - .name = "gpio", - }, - .probe = nmk_gpio_probe, -}; - -static int __init nmk_gpio_init(void) -{ - return platform_driver_register(&nmk_gpio_driver); -} - -core_initcall(nmk_gpio_init); - -MODULE_AUTHOR("Prafulla WADASKAR and Alessandro Rubini"); -MODULE_DESCRIPTION("Nomadik GPIO Driver"); -MODULE_LICENSE("GPL"); - - diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 7245d7d..6c2c3ad 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -38,6 +38,7 @@ obj-$(CONFIG_GPIO_WM8350) += wm8350-gpiolib.o obj-$(CONFIG_GPIO_WM8994) += wm8994-gpio.o obj-$(CONFIG_GPIO_SCH) += sch_gpio.o obj-$(CONFIG_MACH_U300) += gpio-u300.o +obj-$(CONFIG_PLAT_NOMADIK) += gpio-nomadik.o obj-$(CONFIG_GPIO_RDC321X) += rdc321x-gpio.o obj-$(CONFIG_GPIO_JANZ_TTL) += janz-ttl.o obj-$(CONFIG_GPIO_SX150X) += sx150x.o diff --git a/drivers/gpio/gpio-nomadik.c b/drivers/gpio/gpio-nomadik.c new file mode 100644 index 0000000..f49748e --- /dev/null +++ b/drivers/gpio/gpio-nomadik.c @@ -0,0 +1,1024 @@ +/* + * Generic GPIO driver for logic cells found in the Nomadik SoC + * + * Copyright (C) 2008,2009 STMicroelectronics + * Copyright (C) 2009 Alessandro Rubini + * Rewritten based on work by Prafulla WADASKAR + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +/* + * The GPIO module in the Nomadik family of Systems-on-Chip is an + * AMBA device, managing 32 pins and alternate functions. The logic block + * is currently used in the Nomadik and ux500. + * + * Symbols in this file are called "nmk_gpio" for "nomadik gpio" + */ + +#define NMK_GPIO_PER_CHIP 32 + +struct nmk_gpio_chip { + struct gpio_chip chip; + void __iomem *addr; + struct clk *clk; + unsigned int bank; + unsigned int parent_irq; + int secondary_parent_irq; + u32 (*get_secondary_status)(unsigned int bank); + void (*set_ioforce)(bool enable); + spinlock_t lock; + /* Keep track of configured edges */ + u32 edge_rising; + u32 edge_falling; + u32 real_wake; + u32 rwimsc; + u32 fwimsc; + u32 slpm; + u32 enabled; +}; + +static struct nmk_gpio_chip * +nmk_gpio_chips[DIV_ROUND_UP(ARCH_NR_GPIOS, NMK_GPIO_PER_CHIP)]; + +static DEFINE_SPINLOCK(nmk_gpio_slpm_lock); + +#define NUM_BANKS ARRAY_SIZE(nmk_gpio_chips) + +static void __nmk_gpio_set_mode(struct nmk_gpio_chip *nmk_chip, + unsigned offset, int gpio_mode) +{ + u32 bit = 1 << offset; + u32 afunc, bfunc; + + afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & ~bit; + bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & ~bit; + if (gpio_mode & NMK_GPIO_ALT_A) + afunc |= bit; + if (gpio_mode & NMK_GPIO_ALT_B) + bfunc |= bit; + writel(afunc, nmk_chip->addr + NMK_GPIO_AFSLA); + writel(bfunc, nmk_chip->addr + NMK_GPIO_AFSLB); +} + +static void __nmk_gpio_set_slpm(struct nmk_gpio_chip *nmk_chip, + unsigned offset, enum nmk_gpio_slpm mode) +{ + u32 bit = 1 << offset; + u32 slpm; + + slpm = readl(nmk_chip->addr + NMK_GPIO_SLPC); + if (mode == NMK_GPIO_SLPM_NOCHANGE) + slpm |= bit; + else + slpm &= ~bit; + writel(slpm, nmk_chip->addr + NMK_GPIO_SLPC); +} + +static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip, + unsigned offset, enum nmk_gpio_pull pull) +{ + u32 bit = 1 << offset; + u32 pdis; + + pdis = readl(nmk_chip->addr + NMK_GPIO_PDIS); + if (pull == NMK_GPIO_PULL_NONE) + pdis |= bit; + else + pdis &= ~bit; + writel(pdis, nmk_chip->addr + NMK_GPIO_PDIS); + + if (pull == NMK_GPIO_PULL_UP) + writel(bit, nmk_chip->addr + NMK_GPIO_DATS); + else if (pull == NMK_GPIO_PULL_DOWN) + 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_gpio_set_output(struct nmk_gpio_chip *nmk_chip, + unsigned offset, int val) +{ + if (val) + writel(1 << offset, nmk_chip->addr + NMK_GPIO_DATS); + else + writel(1 << offset, nmk_chip->addr + NMK_GPIO_DATC); +} + +static void __nmk_gpio_make_output(struct nmk_gpio_chip *nmk_chip, + unsigned offset, int val) +{ + writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRS); + __nmk_gpio_set_output(nmk_chip, offset, val); +} + +static void __nmk_gpio_set_mode_safe(struct nmk_gpio_chip *nmk_chip, + unsigned offset, int gpio_mode, + bool glitch) +{ + u32 rwimsc = readl(nmk_chip->addr + NMK_GPIO_RWIMSC); + u32 fwimsc = readl(nmk_chip->addr + NMK_GPIO_FWIMSC); + + if (glitch && nmk_chip->set_ioforce) { + u32 bit = BIT(offset); + + /* Prevent spurious wakeups */ + writel(rwimsc & ~bit, nmk_chip->addr + NMK_GPIO_RWIMSC); + writel(fwimsc & ~bit, nmk_chip->addr + NMK_GPIO_FWIMSC); + + nmk_chip->set_ioforce(true); + } + + __nmk_gpio_set_mode(nmk_chip, offset, gpio_mode); + + if (glitch && nmk_chip->set_ioforce) { + nmk_chip->set_ioforce(false); + + writel(rwimsc, nmk_chip->addr + NMK_GPIO_RWIMSC); + writel(fwimsc, nmk_chip->addr + NMK_GPIO_FWIMSC); + } +} + +static void __nmk_config_pin(struct nmk_gpio_chip *nmk_chip, unsigned offset, + pin_cfg_t cfg, bool sleep, unsigned int *slpmregs) +{ + 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/wakeup", + [NMK_GPIO_SLPM_NOCHANGE] = "no-change/no-wakeup", + }; + + int pin = PIN_NUM(cfg); + int pull = PIN_PULL(cfg); + int af = PIN_ALT(cfg); + int slpm = PIN_SLPM(cfg); + int output = PIN_DIR(cfg); + int val = PIN_VAL(cfg); + bool glitch = af == NMK_GPIO_ALT_C; + + dev_dbg(nmk_chip->chip.dev, "pin %d [%#lx]: af %s, pull %s, slpm %s (%s%s)\n", + pin, cfg, afnames[af], pullnames[pull], slpmnames[slpm], + output ? "output " : "input", + output ? (val ? "high" : "low") : ""); + + if (sleep) { + int slpm_pull = PIN_SLPM_PULL(cfg); + int slpm_output = PIN_SLPM_DIR(cfg); + int slpm_val = PIN_SLPM_VAL(cfg); + + af = NMK_GPIO_ALT_GPIO; + + /* + * The SLPM_* values are normal values + 1 to allow zero to + * mean "same as normal". + */ + if (slpm_pull) + pull = slpm_pull - 1; + if (slpm_output) + output = slpm_output - 1; + if (slpm_val) + val = slpm_val - 1; + + dev_dbg(nmk_chip->chip.dev, "pin %d: sleep pull %s, dir %s, val %s\n", + pin, + slpm_pull ? pullnames[pull] : "same", + slpm_output ? (output ? "output" : "input") : "same", + slpm_val ? (val ? "high" : "low") : "same"); + } + + if (output) + __nmk_gpio_make_output(nmk_chip, offset, val); + else { + __nmk_gpio_make_input(nmk_chip, offset); + __nmk_gpio_set_pull(nmk_chip, offset, pull); + } + + /* + * If we've backed up the SLPM registers (glitch workaround), modify + * the backups since they will be restored. + */ + if (slpmregs) { + if (slpm == NMK_GPIO_SLPM_NOCHANGE) + slpmregs[nmk_chip->bank] |= BIT(offset); + else + slpmregs[nmk_chip->bank] &= ~BIT(offset); + } else + __nmk_gpio_set_slpm(nmk_chip, offset, slpm); + + __nmk_gpio_set_mode_safe(nmk_chip, offset, af, glitch); +} + +/* + * Safe sequence used to switch IOs between GPIO and Alternate-C mode: + * - Save SLPM registers + * - Set SLPM=0 for the IOs you want to switch and others to 1 + * - Configure the GPIO registers for the IOs that are being switched + * - Set IOFORCE=1 + * - Modify the AFLSA/B registers for the IOs that are being switched + * - Set IOFORCE=0 + * - Restore SLPM registers + * - Any spurious wake up event during switch sequence to be ignored and + * cleared + */ +static void nmk_gpio_glitch_slpm_init(unsigned int *slpm) +{ + int i; + + for (i = 0; i < NUM_BANKS; i++) { + struct nmk_gpio_chip *chip = nmk_gpio_chips[i]; + unsigned int temp = slpm[i]; + + if (!chip) + break; + + slpm[i] = readl(chip->addr + NMK_GPIO_SLPC); + writel(temp, chip->addr + NMK_GPIO_SLPC); + } +} + +static void nmk_gpio_glitch_slpm_restore(unsigned int *slpm) +{ + int i; + + for (i = 0; i < NUM_BANKS; i++) { + struct nmk_gpio_chip *chip = nmk_gpio_chips[i]; + + if (!chip) + break; + + writel(slpm[i], chip->addr + NMK_GPIO_SLPC); + } +} + +static int __nmk_config_pins(pin_cfg_t *cfgs, int num, bool sleep) +{ + static unsigned int slpm[NUM_BANKS]; + unsigned long flags; + bool glitch = false; + int ret = 0; + int i; + + for (i = 0; i < num; i++) { + if (PIN_ALT(cfgs[i]) == NMK_GPIO_ALT_C) { + glitch = true; + break; + } + } + + spin_lock_irqsave(&nmk_gpio_slpm_lock, flags); + + if (glitch) { + memset(slpm, 0xff, sizeof(slpm)); + + for (i = 0; i < num; i++) { + int pin = PIN_NUM(cfgs[i]); + int offset = pin % NMK_GPIO_PER_CHIP; + + if (PIN_ALT(cfgs[i]) == NMK_GPIO_ALT_C) + slpm[pin / NMK_GPIO_PER_CHIP] &= ~BIT(offset); + } + + nmk_gpio_glitch_slpm_init(slpm); + } + + for (i = 0; i < num; i++) { + struct nmk_gpio_chip *nmk_chip; + int pin = PIN_NUM(cfgs[i]); + + nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(pin)); + if (!nmk_chip) { + ret = -EINVAL; + break; + } + + spin_lock(&nmk_chip->lock); + __nmk_config_pin(nmk_chip, pin - nmk_chip->chip.base, + cfgs[i], sleep, glitch ? slpm : NULL); + spin_unlock(&nmk_chip->lock); + } + + if (glitch) + nmk_gpio_glitch_slpm_restore(slpm); + + spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags); + + return ret; +} + +/** + * 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/-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, bool sleep) +{ + return __nmk_config_pins(&cfg, 1, sleep); +} +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) +{ + return __nmk_config_pins(cfgs, num, false); +} +EXPORT_SYMBOL(nmk_config_pins); + +int nmk_config_pins_sleep(pin_cfg_t *cfgs, int num) +{ + return __nmk_config_pins(cfgs, num, true); +} +EXPORT_SYMBOL(nmk_config_pins_sleep); + +/** + * nmk_gpio_set_slpm() - configure the sleep mode of a pin + * @gpio: pin number + * @mode: NMK_GPIO_SLPM_INPUT or NMK_GPIO_SLPM_NOCHANGE, + * + * Sets the sleep mode of a pin. If @mode is NMK_GPIO_SLPM_INPUT, the pin is + * changed to an input (with pullup/down enabled) in sleep and deep sleep. If + * @mode is NMK_GPIO_SLPM_NOCHANGE, the pin remains in the state it was + * configured even when in sleep and deep sleep. + * + * On DB8500v2 onwards, this setting loses the previous meaning and instead + * indicates if wakeup detection is enabled on the pin. Note that + * enable_irq_wake() will automatically enable wakeup detection. + */ +int nmk_gpio_set_slpm(int gpio, enum nmk_gpio_slpm mode) +{ + struct nmk_gpio_chip *nmk_chip; + unsigned long flags; + + nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(gpio)); + if (!nmk_chip) + return -EINVAL; + + spin_lock_irqsave(&nmk_gpio_slpm_lock, flags); + spin_lock(&nmk_chip->lock); + + __nmk_gpio_set_slpm(nmk_chip, gpio - nmk_chip->chip.base, mode); + + spin_unlock(&nmk_chip->lock); + spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags); + + return 0; +} + +/** + * nmk_gpio_set_pull() - enable/disable pull up/down on a gpio + * @gpio: pin number + * @pull: one of NMK_GPIO_PULL_DOWN, NMK_GPIO_PULL_UP, and NMK_GPIO_PULL_NONE + * + * Enables/disables pull up/down on a specified pin. This only takes effect if + * the pin is configured as an input (either explicitly or by the alternate + * function). + * + * NOTE: If enabling the pull up/down, the caller must ensure that the GPIO is + * configured as an input. Otherwise, due to the way the controller registers + * work, this function will change the value output on the pin. + */ +int nmk_gpio_set_pull(int gpio, enum nmk_gpio_pull pull) +{ + struct nmk_gpio_chip *nmk_chip; + unsigned long flags; + + nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(gpio)); + if (!nmk_chip) + return -EINVAL; + + spin_lock_irqsave(&nmk_chip->lock, flags); + __nmk_gpio_set_pull(nmk_chip, gpio - nmk_chip->chip.base, pull); + spin_unlock_irqrestore(&nmk_chip->lock, flags); + + return 0; +} + +/* Mode functions */ +/** + * nmk_gpio_set_mode() - set the mux mode of a gpio pin + * @gpio: pin number + * @gpio_mode: one of NMK_GPIO_ALT_GPIO, NMK_GPIO_ALT_A, + * NMK_GPIO_ALT_B, and NMK_GPIO_ALT_C + * + * Sets the mode of the specified pin to one of the alternate functions or + * plain GPIO. + */ +int nmk_gpio_set_mode(int gpio, int gpio_mode) +{ + struct nmk_gpio_chip *nmk_chip; + unsigned long flags; + + nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(gpio)); + if (!nmk_chip) + return -EINVAL; + + spin_lock_irqsave(&nmk_chip->lock, flags); + __nmk_gpio_set_mode(nmk_chip, gpio - nmk_chip->chip.base, gpio_mode); + spin_unlock_irqrestore(&nmk_chip->lock, flags); + + return 0; +} +EXPORT_SYMBOL(nmk_gpio_set_mode); + +int nmk_gpio_get_mode(int gpio) +{ + struct nmk_gpio_chip *nmk_chip; + u32 afunc, bfunc, bit; + + nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(gpio)); + if (!nmk_chip) + return -EINVAL; + + bit = 1 << (gpio - nmk_chip->chip.base); + + afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & bit; + bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & bit; + + return (afunc ? NMK_GPIO_ALT_A : 0) | (bfunc ? NMK_GPIO_ALT_B : 0); +} +EXPORT_SYMBOL(nmk_gpio_get_mode); + + +/* IRQ functions */ +static inline int nmk_gpio_get_bitmask(int gpio) +{ + return 1 << (gpio % 32); +} + +static void nmk_gpio_irq_ack(struct irq_data *d) +{ + int gpio; + struct nmk_gpio_chip *nmk_chip; + + gpio = NOMADIK_IRQ_TO_GPIO(d->irq); + nmk_chip = irq_data_get_irq_chip_data(d); + if (!nmk_chip) + return; + writel(nmk_gpio_get_bitmask(gpio), nmk_chip->addr + NMK_GPIO_IC); +} + +enum nmk_gpio_irq_type { + NORMAL, + WAKE, +}; + +static void __nmk_gpio_irq_modify(struct nmk_gpio_chip *nmk_chip, + int gpio, enum nmk_gpio_irq_type which, + bool enable) +{ + u32 rimsc = which == WAKE ? NMK_GPIO_RWIMSC : NMK_GPIO_RIMSC; + u32 fimsc = which == WAKE ? NMK_GPIO_FWIMSC : NMK_GPIO_FIMSC; + u32 bitmask = nmk_gpio_get_bitmask(gpio); + u32 reg; + + /* we must individually set/clear the two edges */ + if (nmk_chip->edge_rising & bitmask) { + reg = readl(nmk_chip->addr + rimsc); + if (enable) + reg |= bitmask; + else + reg &= ~bitmask; + writel(reg, nmk_chip->addr + rimsc); + } + if (nmk_chip->edge_falling & bitmask) { + reg = readl(nmk_chip->addr + fimsc); + if (enable) + reg |= bitmask; + else + reg &= ~bitmask; + writel(reg, nmk_chip->addr + fimsc); + } +} + +static void __nmk_gpio_set_wake(struct nmk_gpio_chip *nmk_chip, + int gpio, bool on) +{ + __nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, on); +} + +static int nmk_gpio_irq_maskunmask(struct irq_data *d, bool enable) +{ + int gpio; + struct nmk_gpio_chip *nmk_chip; + unsigned long flags; + u32 bitmask; + + gpio = NOMADIK_IRQ_TO_GPIO(d->irq); + nmk_chip = irq_data_get_irq_chip_data(d); + bitmask = nmk_gpio_get_bitmask(gpio); + if (!nmk_chip) + return -EINVAL; + + if (enable) + nmk_chip->enabled |= bitmask; + else + nmk_chip->enabled &= ~bitmask; + + spin_lock_irqsave(&nmk_gpio_slpm_lock, flags); + spin_lock(&nmk_chip->lock); + + __nmk_gpio_irq_modify(nmk_chip, gpio, NORMAL, enable); + + if (!(nmk_chip->real_wake & bitmask)) + __nmk_gpio_set_wake(nmk_chip, gpio, enable); + + spin_unlock(&nmk_chip->lock); + spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags); + + return 0; +} + +static void nmk_gpio_irq_mask(struct irq_data *d) +{ + nmk_gpio_irq_maskunmask(d, false); +} + +static void nmk_gpio_irq_unmask(struct irq_data *d) +{ + nmk_gpio_irq_maskunmask(d, true); +} + +static int nmk_gpio_irq_set_wake(struct irq_data *d, unsigned int on) +{ + struct nmk_gpio_chip *nmk_chip; + unsigned long flags; + u32 bitmask; + int gpio; + + gpio = NOMADIK_IRQ_TO_GPIO(d->irq); + nmk_chip = irq_data_get_irq_chip_data(d); + if (!nmk_chip) + return -EINVAL; + bitmask = nmk_gpio_get_bitmask(gpio); + + spin_lock_irqsave(&nmk_gpio_slpm_lock, flags); + spin_lock(&nmk_chip->lock); + + if (!(nmk_chip->enabled & bitmask)) + __nmk_gpio_set_wake(nmk_chip, gpio, on); + + if (on) + nmk_chip->real_wake |= bitmask; + else + nmk_chip->real_wake &= ~bitmask; + + spin_unlock(&nmk_chip->lock); + spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags); + + return 0; +} + +static int nmk_gpio_irq_set_type(struct irq_data *d, unsigned int type) +{ + bool enabled, wake = irqd_is_wakeup_set(d); + int gpio; + struct nmk_gpio_chip *nmk_chip; + unsigned long flags; + u32 bitmask; + + gpio = NOMADIK_IRQ_TO_GPIO(d->irq); + nmk_chip = irq_data_get_irq_chip_data(d); + bitmask = nmk_gpio_get_bitmask(gpio); + if (!nmk_chip) + return -EINVAL; + + if (type & IRQ_TYPE_LEVEL_HIGH) + return -EINVAL; + if (type & IRQ_TYPE_LEVEL_LOW) + return -EINVAL; + + enabled = nmk_chip->enabled & bitmask; + + spin_lock_irqsave(&nmk_chip->lock, flags); + + if (enabled) + __nmk_gpio_irq_modify(nmk_chip, gpio, NORMAL, false); + + if (enabled || wake) + __nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, false); + + nmk_chip->edge_rising &= ~bitmask; + if (type & IRQ_TYPE_EDGE_RISING) + nmk_chip->edge_rising |= bitmask; + + nmk_chip->edge_falling &= ~bitmask; + if (type & IRQ_TYPE_EDGE_FALLING) + nmk_chip->edge_falling |= bitmask; + + if (enabled) + __nmk_gpio_irq_modify(nmk_chip, gpio, NORMAL, true); + + if (enabled || wake) + __nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, true); + + spin_unlock_irqrestore(&nmk_chip->lock, flags); + + return 0; +} + +static struct irq_chip nmk_gpio_irq_chip = { + .name = "Nomadik-GPIO", + .irq_ack = nmk_gpio_irq_ack, + .irq_mask = nmk_gpio_irq_mask, + .irq_unmask = nmk_gpio_irq_unmask, + .irq_set_type = nmk_gpio_irq_set_type, + .irq_set_wake = nmk_gpio_irq_set_wake, +}; + +static void __nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc, + u32 status) +{ + struct nmk_gpio_chip *nmk_chip; + struct irq_chip *host_chip = irq_get_chip(irq); + unsigned int first_irq; + + if (host_chip->irq_mask_ack) + host_chip->irq_mask_ack(&desc->irq_data); + else { + host_chip->irq_mask(&desc->irq_data); + if (host_chip->irq_ack) + host_chip->irq_ack(&desc->irq_data); + } + + nmk_chip = irq_get_handler_data(irq); + first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base); + while (status) { + int bit = __ffs(status); + + generic_handle_irq(first_irq + bit); + status &= ~BIT(bit); + } + + host_chip->irq_unmask(&desc->irq_data); +} + +static void nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) +{ + struct nmk_gpio_chip *nmk_chip = irq_get_handler_data(irq); + u32 status = readl(nmk_chip->addr + NMK_GPIO_IS); + + __nmk_gpio_irq_handler(irq, desc, status); +} + +static void nmk_gpio_secondary_irq_handler(unsigned int irq, + struct irq_desc *desc) +{ + struct nmk_gpio_chip *nmk_chip = irq_get_handler_data(irq); + u32 status = nmk_chip->get_secondary_status(nmk_chip->bank); + + __nmk_gpio_irq_handler(irq, desc, status); +} + +static int nmk_gpio_init_irq(struct nmk_gpio_chip *nmk_chip) +{ + unsigned int first_irq; + int i; + + first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base); + for (i = first_irq; i < first_irq + nmk_chip->chip.ngpio; i++) { + irq_set_chip_and_handler(i, &nmk_gpio_irq_chip, + handle_edge_irq); + set_irq_flags(i, IRQF_VALID); + irq_set_chip_data(i, nmk_chip); + irq_set_irq_type(i, IRQ_TYPE_EDGE_FALLING); + } + + irq_set_chained_handler(nmk_chip->parent_irq, nmk_gpio_irq_handler); + irq_set_handler_data(nmk_chip->parent_irq, nmk_chip); + + if (nmk_chip->secondary_parent_irq >= 0) { + irq_set_chained_handler(nmk_chip->secondary_parent_irq, + nmk_gpio_secondary_irq_handler); + irq_set_handler_data(nmk_chip->secondary_parent_irq, nmk_chip); + } + + return 0; +} + +/* I/O Functions */ +static int nmk_gpio_make_input(struct gpio_chip *chip, unsigned offset) +{ + struct nmk_gpio_chip *nmk_chip = + container_of(chip, struct nmk_gpio_chip, chip); + + writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC); + return 0; +} + +static int nmk_gpio_get_input(struct gpio_chip *chip, unsigned offset) +{ + struct nmk_gpio_chip *nmk_chip = + container_of(chip, struct nmk_gpio_chip, chip); + u32 bit = 1 << offset; + + return (readl(nmk_chip->addr + NMK_GPIO_DAT) & bit) != 0; +} + +static void nmk_gpio_set_output(struct gpio_chip *chip, unsigned offset, + int val) +{ + struct nmk_gpio_chip *nmk_chip = + container_of(chip, struct nmk_gpio_chip, chip); + + __nmk_gpio_set_output(nmk_chip, offset, val); +} + +static int nmk_gpio_make_output(struct gpio_chip *chip, unsigned offset, + int val) +{ + struct nmk_gpio_chip *nmk_chip = + container_of(chip, struct nmk_gpio_chip, chip); + + __nmk_gpio_make_output(nmk_chip, offset, val); + + return 0; +} + +static int nmk_gpio_to_irq(struct gpio_chip *chip, unsigned offset) +{ + struct nmk_gpio_chip *nmk_chip = + container_of(chip, struct nmk_gpio_chip, chip); + + return NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base) + offset; +} + +#ifdef CONFIG_DEBUG_FS + +#include + +static void nmk_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) +{ + int mode; + unsigned i; + unsigned gpio = chip->base; + int is_out; + struct nmk_gpio_chip *nmk_chip = + container_of(chip, struct nmk_gpio_chip, chip); + const char *modes[] = { + [NMK_GPIO_ALT_GPIO] = "gpio", + [NMK_GPIO_ALT_A] = "altA", + [NMK_GPIO_ALT_B] = "altB", + [NMK_GPIO_ALT_C] = "altC", + }; + + for (i = 0; i < chip->ngpio; i++, gpio++) { + const char *label = gpiochip_is_requested(chip, i); + bool pull; + u32 bit = 1 << i; + + if (!label) + continue; + + is_out = readl(nmk_chip->addr + NMK_GPIO_DIR) & bit; + pull = !(readl(nmk_chip->addr + NMK_GPIO_PDIS) & bit); + mode = nmk_gpio_get_mode(gpio); + seq_printf(s, " gpio-%-3d (%-20.20s) %s %s %s %s", + gpio, label, + is_out ? "out" : "in ", + chip->get + ? (chip->get(chip, i) ? "hi" : "lo") + : "? ", + (mode < 0) ? "unknown" : modes[mode], + pull ? "pull" : "none"); + seq_printf(s, "\n"); + } +} + +#else +#define nmk_gpio_dbg_show NULL +#endif + +/* This structure is replicated for each GPIO block allocated at probe time */ +static struct gpio_chip nmk_gpio_template = { + .direction_input = nmk_gpio_make_input, + .get = nmk_gpio_get_input, + .direction_output = nmk_gpio_make_output, + .set = nmk_gpio_set_output, + .to_irq = nmk_gpio_to_irq, + .dbg_show = nmk_gpio_dbg_show, + .can_sleep = 0, +}; + +/* + * Called from the suspend/resume path to only keep the real wakeup interrupts + * (those that have had set_irq_wake() called on them) as wakeup interrupts, + * and not the rest of the interrupts which we needed to have as wakeups for + * cpuidle. + * + * PM ops are not used since this needs to be done at the end, after all the + * other drivers are done with their suspend callbacks. + */ +void nmk_gpio_wakeups_suspend(void) +{ + int i; + + for (i = 0; i < NUM_BANKS; i++) { + struct nmk_gpio_chip *chip = nmk_gpio_chips[i]; + + if (!chip) + break; + + chip->rwimsc = readl(chip->addr + NMK_GPIO_RWIMSC); + chip->fwimsc = readl(chip->addr + NMK_GPIO_FWIMSC); + + writel(chip->rwimsc & chip->real_wake, + chip->addr + NMK_GPIO_RWIMSC); + writel(chip->fwimsc & chip->real_wake, + chip->addr + NMK_GPIO_FWIMSC); + + if (cpu_is_u8500v2()) { + chip->slpm = readl(chip->addr + NMK_GPIO_SLPC); + + /* 0 -> wakeup enable */ + writel(~chip->real_wake, chip->addr + NMK_GPIO_SLPC); + } + } +} + +void nmk_gpio_wakeups_resume(void) +{ + int i; + + for (i = 0; i < NUM_BANKS; i++) { + struct nmk_gpio_chip *chip = nmk_gpio_chips[i]; + + if (!chip) + break; + + writel(chip->rwimsc, chip->addr + NMK_GPIO_RWIMSC); + writel(chip->fwimsc, chip->addr + NMK_GPIO_FWIMSC); + + if (cpu_is_u8500v2()) + writel(chip->slpm, chip->addr + NMK_GPIO_SLPC); + } +} + +static int __devinit nmk_gpio_probe(struct platform_device *dev) +{ + struct nmk_gpio_platform_data *pdata = dev->dev.platform_data; + struct nmk_gpio_chip *nmk_chip; + struct gpio_chip *chip; + struct resource *res; + struct clk *clk; + int secondary_irq; + int irq; + int ret; + + if (!pdata) + return -ENODEV; + + res = platform_get_resource(dev, IORESOURCE_MEM, 0); + if (!res) { + ret = -ENOENT; + goto out; + } + + irq = platform_get_irq(dev, 0); + if (irq < 0) { + ret = irq; + goto out; + } + + secondary_irq = platform_get_irq(dev, 1); + if (secondary_irq >= 0 && !pdata->get_secondary_status) { + ret = -EINVAL; + goto out; + } + + if (request_mem_region(res->start, resource_size(res), + dev_name(&dev->dev)) == NULL) { + ret = -EBUSY; + goto out; + } + + clk = clk_get(&dev->dev, NULL); + if (IS_ERR(clk)) { + ret = PTR_ERR(clk); + goto out_release; + } + + clk_enable(clk); + + nmk_chip = kzalloc(sizeof(*nmk_chip), GFP_KERNEL); + if (!nmk_chip) { + ret = -ENOMEM; + goto out_clk; + } + /* + * The virt address in nmk_chip->addr is in the nomadik register space, + * so we can simply convert the resource address, without remapping + */ + nmk_chip->bank = dev->id; + nmk_chip->clk = clk; + nmk_chip->addr = io_p2v(res->start); + nmk_chip->chip = nmk_gpio_template; + nmk_chip->parent_irq = irq; + nmk_chip->secondary_parent_irq = secondary_irq; + nmk_chip->get_secondary_status = pdata->get_secondary_status; + nmk_chip->set_ioforce = pdata->set_ioforce; + spin_lock_init(&nmk_chip->lock); + + chip = &nmk_chip->chip; + chip->base = pdata->first_gpio; + chip->ngpio = pdata->num_gpio; + chip->label = pdata->name ?: dev_name(&dev->dev); + chip->dev = &dev->dev; + chip->owner = THIS_MODULE; + + ret = gpiochip_add(&nmk_chip->chip); + if (ret) + goto out_free; + + BUG_ON(nmk_chip->bank >= ARRAY_SIZE(nmk_gpio_chips)); + + nmk_gpio_chips[nmk_chip->bank] = nmk_chip; + platform_set_drvdata(dev, nmk_chip); + + nmk_gpio_init_irq(nmk_chip); + + dev_info(&dev->dev, "Bits %i-%i at address %p\n", + nmk_chip->chip.base, nmk_chip->chip.base+31, nmk_chip->addr); + return 0; + +out_free: + kfree(nmk_chip); +out_clk: + clk_disable(clk); + clk_put(clk); +out_release: + release_mem_region(res->start, resource_size(res)); +out: + dev_err(&dev->dev, "Failure %i for GPIO %i-%i\n", ret, + pdata->first_gpio, pdata->first_gpio+31); + return ret; +} + +static struct platform_driver nmk_gpio_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "gpio", + }, + .probe = nmk_gpio_probe, +}; + +static int __init nmk_gpio_init(void) +{ + return platform_driver_register(&nmk_gpio_driver); +} + +core_initcall(nmk_gpio_init); + +MODULE_AUTHOR("Prafulla WADASKAR and Alessandro Rubini"); +MODULE_DESCRIPTION("Nomadik GPIO Driver"); +MODULE_LICENSE("GPL"); + +