From patchwork Tue Dec 16 02:18:26 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ray Jui X-Patchwork-Id: 421753 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 82D561400E2 for ; Tue, 16 Dec 2014 13:19:44 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751201AbaLPCSu (ORCPT ); Mon, 15 Dec 2014 21:18:50 -0500 Received: from mail-gw2-out.broadcom.com ([216.31.210.63]:64799 "EHLO mail-gw2-out.broadcom.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751122AbaLPCSp (ORCPT ); Mon, 15 Dec 2014 21:18:45 -0500 X-IronPort-AV: E=Sophos;i="5.07,583,1413270000"; d="scan'208";a="53138593" Received: from irvexchcas08.broadcom.com (HELO IRVEXCHCAS08.corp.ad.broadcom.com) ([10.9.208.57]) by mail-gw2-out.broadcom.com with ESMTP; 15 Dec 2014 18:49:51 -0800 Received: from IRVEXCHSMTP3.corp.ad.broadcom.com (10.9.207.53) by IRVEXCHCAS08.corp.ad.broadcom.com (10.9.208.57) with Microsoft SMTP Server (TLS) id 14.3.174.1; Mon, 15 Dec 2014 18:18:57 -0800 Received: from mail-irva-13.broadcom.com (10.10.10.20) by IRVEXCHSMTP3.corp.ad.broadcom.com (10.9.207.53) with Microsoft SMTP Server id 14.3.174.1; Mon, 15 Dec 2014 18:19:12 -0800 Received: from mail.broadcom.com (lbrmn-lnxub44.ric.broadcom.com [10.136.8.49]) by mail-irva-13.broadcom.com (Postfix) with ESMTP id 0E8C041040; Mon, 15 Dec 2014 18:17:56 -0800 (PST) From: Ray Jui To: Rob Herring , Pawel Moll , "Mark Rutland" , Ian Campbell , Kumar Gala , "Linus Walleij" , Alexandre Courbot , Grant Likely , Christian Daudt , Matt Porter , Florian Fainelli , Russell King , Joe Perches , "Arnd Bergmann" CC: Scott Branden , , , , , , "Ray Jui" Subject: [PATCH v6 2/3] gpio: Cygnus: add GPIO driver Date: Mon, 15 Dec 2014 18:18:26 -0800 Message-ID: <1418696307-19392-3-git-send-email-rjui@broadcom.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1418696307-19392-1-git-send-email-rjui@broadcom.com> References: <1418696307-19392-1-git-send-email-rjui@broadcom.com> MIME-Version: 1.0 Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller Signed-off-by: Ray Jui Reviewed-by: Scott Branden --- drivers/gpio/Kconfig | 12 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-bcm-cygnus.c | 607 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 620 insertions(+) create mode 100644 drivers/gpio/gpio-bcm-cygnus.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 633ec21..1790ffd 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -126,6 +126,18 @@ config GPIO_74XX_MMIO 8 bits: 74244 (Input), 74273 (Output) 16 bits: 741624 (Input), 7416374 (Output) +config GPIO_BCM_CYGNUS + bool "Broadcom Cygnus GPIO support" + depends on ARCH_BCM_CYGNUS && OF_GPIO + default y + help + Say yes here to turn on GPIO support for Broadcom Cygnus SoC + + The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU + GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and + the always-ON GPIO controller (CRMU). All 3 GPIO controllers are + supported by this driver + config GPIO_CLPS711X tristate "CLPS711X GPIO support" depends on ARCH_CLPS711X || COMPILE_TEST diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 81755f1..31eb7e0 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520) += gpio-adp5520.o obj-$(CONFIG_GPIO_ADP5588) += gpio-adp5588.o obj-$(CONFIG_GPIO_AMD8111) += gpio-amd8111.o obj-$(CONFIG_GPIO_ARIZONA) += gpio-arizona.o +obj-$(CONFIG_GPIO_BCM_CYGNUS) += gpio-bcm-cygnus.o obj-$(CONFIG_GPIO_BCM_KONA) += gpio-bcm-kona.o obj-$(CONFIG_GPIO_BT8XX) += gpio-bt8xx.o obj-$(CONFIG_GPIO_CLPS711X) += gpio-clps711x.o diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c new file mode 100644 index 0000000..817bc9a --- /dev/null +++ b/drivers/gpio/gpio-bcm-cygnus.c @@ -0,0 +1,607 @@ +/* + * Copyright (C) 2014 Broadcom Corporation + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation version 2. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define CYGNUS_GPIO_DATA_IN_OFFSET 0x00 +#define CYGNUS_GPIO_DATA_OUT_OFFSET 0x04 +#define CYGNUS_GPIO_OUT_EN_OFFSET 0x08 +#define CYGNUS_GPIO_IN_TYPE_OFFSET 0x0c +#define CYGNUS_GPIO_INT_DE_OFFSET 0x10 +#define CYGNUS_GPIO_INT_EDGE_OFFSET 0x14 +#define CYGNUS_GPIO_INT_MSK_OFFSET 0x18 +#define CYGNUS_GPIO_INT_STAT_OFFSET 0x1c +#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20 +#define CYGNUS_GPIO_INT_CLR_OFFSET 0x24 +#define CYGNUS_GPIO_PAD_RES_OFFSET 0x34 +#define CYGNUS_GPIO_RES_EN_OFFSET 0x38 + +/* drive strength control for ASIU GPIO */ +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58 + +/* drive strength control for CCM GPIO */ +#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET 0x00 + +#define GPIO_BANK_SIZE 0x200 +#define NGPIOS_PER_BANK 32 +#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK) + +#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg)) +#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK) + +#define GPIO_FLAG_BIT_MASK 0xffff +#define GPIO_PULL_BIT_SHIFT 16 +#define GPIO_PULL_BIT_MASK 0x3 + +#define GPIO_DRV_STRENGTH_BIT_SHIFT 20 +#define GPIO_DRV_STRENGTH_BITS 3 +#define GPIO_DRV_STRENGTH_BIT_MASK ((1 << GPIO_DRV_STRENGTH_BITS) - 1) + +/* + * For GPIO internal pull up/down registers + */ +enum gpio_pull { + GPIO_PULL_NONE = 0, + GPIO_PULL_UP, + GPIO_PULL_DOWN, + GPIO_PULL_INVALID, +}; + +/* + * GPIO drive strength + */ +enum gpio_drv_strength { + GPIO_DRV_STRENGTH_2MA = 0, + GPIO_DRV_STRENGTH_4MA, + GPIO_DRV_STRENGTH_6MA, + GPIO_DRV_STRENGTH_8MA, + GPIO_DRV_STRENGTH_10MA, + GPIO_DRV_STRENGTH_12MA, + GPIO_DRV_STRENGTH_14MA, + GPIO_DRV_STRENGTH_16MA, + GPIO_DRV_STRENGTH_INVALID, +}; + +struct cygnus_gpio { + struct device *dev; + void __iomem *base; + void __iomem *io_ctrl; + spinlock_t lock; + struct gpio_chip gc; + unsigned num_banks; + int irq; + struct irq_domain *irq_domain; +}; + +static struct cygnus_gpio *to_cygnus_gpio(struct gpio_chip *gc) +{ + return container_of(gc, struct cygnus_gpio, gc); +} + +static u32 cygnus_readl(struct cygnus_gpio *cygnus_gpio, unsigned int offset) +{ + return readl(cygnus_gpio->base + offset); +} + +static void cygnus_writel(struct cygnus_gpio *cygnus_gpio, + unsigned int offset, u32 val) +{ + writel(val, cygnus_gpio->base + offset); +} + +/** + * cygnus_set_bit - set or clear one bit (corresponding to the GPIO pin) in a + * Cygnus GPIO register + * + * @cygnus_gpio: Cygnus GPIO device + * @reg: register offset + * @gpio: GPIO pin + * @set: set or clear. 1 - set; 0 -clear + */ +static void cygnus_set_bit(struct cygnus_gpio *cygnus_gpio, + unsigned int reg, unsigned gpio, int set) +{ + unsigned int offset = CYGNUS_GPIO_REG(gpio, reg); + unsigned int shift = CYGNUS_GPIO_SHIFT(gpio); + u32 val; + + val = cygnus_readl(cygnus_gpio, offset); + if (set) + val |= BIT(shift); + else + val &= ~BIT(shift); + cygnus_writel(cygnus_gpio, offset, val); +} + +static int cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset) +{ + struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc); + + return irq_find_mapping(cygnus_gpio->irq_domain, offset); +} + +static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) +{ + struct cygnus_gpio *cygnus_gpio; + struct irq_chip *chip = irq_desc_get_chip(desc); + int i, bit; + + chained_irq_enter(chip, desc); + + cygnus_gpio = irq_get_handler_data(irq); + + /* go through the entire GPIO banks and handle all interrupts */ + for (i = 0; i < cygnus_gpio->num_banks; i++) { + unsigned long val = cygnus_readl(cygnus_gpio, + (i * GPIO_BANK_SIZE) + + CYGNUS_GPIO_INT_MSTAT_OFFSET); + + for_each_set_bit(bit, &val, NGPIOS_PER_BANK) { + unsigned pin = NGPIOS_PER_BANK * i + bit; + int child_irq = + cygnus_gpio_to_irq(&cygnus_gpio->gc, pin); + + /* + * Clear the interrupt before invoking the + * handler, so we do not leave any window + */ + cygnus_writel(cygnus_gpio, (i * GPIO_BANK_SIZE) + + CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit)); + + generic_handle_irq(child_irq); + } + } + + chained_irq_exit(chip, desc); +} + + +static void cygnus_gpio_irq_ack(struct irq_data *d) +{ + struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d); + unsigned gpio = d->hwirq; + unsigned int offset = CYGNUS_GPIO_REG(gpio, + CYGNUS_GPIO_INT_CLR_OFFSET); + unsigned int shift = CYGNUS_GPIO_SHIFT(gpio); + u32 val = BIT(shift); + + cygnus_writel(cygnus_gpio, offset, val); +} + +/** + * cygnus_gpio_irq_set_mask - mask/unmask a GPIO interrupt + * + * @d: IRQ chip data + * @mask: mask/unmask GPIO interrupt. 0 - mask (disable); 1 - unmask (enable) + */ +static void cygnus_gpio_irq_set_mask(struct irq_data *d, int mask) +{ + struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d); + unsigned gpio = d->hwirq; + + cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_MSK_OFFSET, gpio, mask); +} + +static void cygnus_gpio_irq_mask(struct irq_data *d) +{ + struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d); + unsigned long flags; + + spin_lock_irqsave(&cygnus_gpio->lock, flags); + cygnus_gpio_irq_set_mask(d, 0); + spin_unlock_irqrestore(&cygnus_gpio->lock, flags); +} + +static void cygnus_gpio_irq_unmask(struct irq_data *d) +{ + struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d); + unsigned long flags; + + spin_lock_irqsave(&cygnus_gpio->lock, flags); + cygnus_gpio_irq_set_mask(d, 1); + spin_unlock_irqrestore(&cygnus_gpio->lock, flags); +} + +static int cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type) +{ + struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d); + unsigned gpio = d->hwirq; + int int_type = 0, dual_edge = 0, edge_lvl = 0; + unsigned long flags; + + switch (type & IRQ_TYPE_SENSE_MASK) { + case IRQ_TYPE_EDGE_RISING: + edge_lvl = 1; + break; + + case IRQ_TYPE_EDGE_FALLING: + break; + + case IRQ_TYPE_EDGE_BOTH: + dual_edge = 1; + break; + + case IRQ_TYPE_LEVEL_HIGH: + int_type = 1; + edge_lvl = 1; + break; + + case IRQ_TYPE_LEVEL_LOW: + int_type = 1; + break; + + default: + dev_err(cygnus_gpio->dev, "invalid GPIO IRQ type 0x%x\n", + type); + return -EINVAL; + } + + spin_lock_irqsave(&cygnus_gpio->lock, flags); + cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio, + int_type); + cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_DE_OFFSET, gpio, + dual_edge); + cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio, + edge_lvl); + spin_unlock_irqrestore(&cygnus_gpio->lock, flags); + + dev_dbg(cygnus_gpio->dev, + "gpio:%u set int_type:%d dual_edge:%d edge_lvl:%d\n", + gpio, int_type, dual_edge, edge_lvl); + + return 0; +} + +static struct irq_chip cygnus_gpio_irq_chip = { + .name = "bcm-cygnus-gpio", + .irq_ack = cygnus_gpio_irq_ack, + .irq_mask = cygnus_gpio_irq_mask, + .irq_unmask = cygnus_gpio_irq_unmask, + .irq_set_type = cygnus_gpio_irq_set_type, +}; + +static int cygnus_gpio_direction_input(struct gpio_chip *gc, unsigned gpio) +{ + struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc); + unsigned long flags; + + spin_lock_irqsave(&cygnus_gpio->lock, flags); + cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 0); + spin_unlock_irqrestore(&cygnus_gpio->lock, flags); + + dev_dbg(cygnus_gpio->dev, "gpio:%u set input\n", gpio); + + return 0; +} + +static int cygnus_gpio_direction_output(struct gpio_chip *gc, + unsigned gpio, int value) +{ + struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc); + unsigned long flags; + + spin_lock_irqsave(&cygnus_gpio->lock, flags); + cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1); + cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value); + spin_unlock_irqrestore(&cygnus_gpio->lock, flags); + + dev_dbg(cygnus_gpio->dev, "gpio:%u set output, value:%d\n", + gpio, value); + + return 0; +} + +static void cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio, + int value) +{ + struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc); + unsigned long flags; + + spin_lock_irqsave(&cygnus_gpio->lock, flags); + cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value); + spin_unlock_irqrestore(&cygnus_gpio->lock, flags); + + dev_dbg(cygnus_gpio->dev, "gpio:%u set, value:%d\n", gpio, value); +} + +static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio) +{ + struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc); + unsigned int offset = CYGNUS_GPIO_REG(gpio, + CYGNUS_GPIO_DATA_IN_OFFSET); + unsigned int shift = CYGNUS_GPIO_SHIFT(gpio); + u32 val; + + val = cygnus_readl(cygnus_gpio, offset); + val = (val >> shift) & 1; + + dev_dbg(cygnus_gpio->dev, "gpio:%u get, value:%d\n", gpio, val); + + return val; +} + +static struct lock_class_key gpio_lock_class; + +static int cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq, + irq_hw_number_t hwirq) +{ + int ret; + + ret = irq_set_chip_data(irq, d->host_data); + if (ret < 0) + return ret; + irq_set_lockdep_class(irq, &gpio_lock_class); + irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip, + handle_simple_irq); + set_irq_flags(irq, IRQF_VALID); + + return 0; +} + +static void cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq) +{ + irq_set_chip_and_handler(irq, NULL, NULL); + irq_set_chip_data(irq, NULL); +} + +static struct irq_domain_ops cygnus_irq_ops = { + .map = cygnus_gpio_irq_map, + .unmap = cygnus_gpio_irq_unmap, + .xlate = irq_domain_xlate_twocell, +}; + +#ifdef CONFIG_OF_GPIO +static void cygnus_gpio_set_pull(struct cygnus_gpio *cygnus_gpio, + unsigned gpio, enum gpio_pull pull) +{ + int pullup; + unsigned long flags; + + switch (pull) { + case GPIO_PULL_UP: + pullup = 1; + break; + case GPIO_PULL_DOWN: + pullup = 0; + break; + case GPIO_PULL_NONE: + case GPIO_PULL_INVALID: + default: + return; + } + + spin_lock_irqsave(&cygnus_gpio->lock, flags); + /* set pull up/down */ + cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_PAD_RES_OFFSET, gpio, pullup); + /* enable pad */ + cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 1); + spin_unlock_irqrestore(&cygnus_gpio->lock, flags); + + dev_dbg(cygnus_gpio->dev, "gpio:%u set pullup:%d\n", gpio, pullup); +} + +static void cygnus_gpio_set_strength(struct cygnus_gpio *cygnus_gpio, + unsigned gpio, enum gpio_drv_strength strength) +{ + struct device *dev = cygnus_gpio->dev; + void __iomem *base; + unsigned int i, offset, shift; + u32 val; + unsigned long flags; + + /* some GPIO controllers do not support drive strength configuration */ + if (of_find_property(dev->of_node, "no-drv-strength", NULL)) + return; + + /* + * Some GPIO controllers use a different register block for drive + * strength control + */ + if (cygnus_gpio->io_ctrl) { + base = cygnus_gpio->io_ctrl; + offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET; + } else { + base = cygnus_gpio->base; + offset = CYGNUS_GPIO_REG(gpio, + CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET); + } + + shift = CYGNUS_GPIO_SHIFT(gpio); + + spin_lock_irqsave(&cygnus_gpio->lock, flags); + + for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) { + val = readl(base + offset); + val &= ~BIT(shift); + val |= ((strength >> i) & 0x1) << shift; + writel(val, base + offset); + offset += 4; + } + + spin_unlock_irqrestore(&cygnus_gpio->lock, flags); + + dev_dbg(cygnus_gpio->dev, + "gpio:%u set drive strength:%d\n", gpio, strength); +} + +static int cygnus_gpio_of_xlate(struct gpio_chip *gc, + const struct of_phandle_args *gpiospec, u32 *flags) +{ + struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc); + enum gpio_pull pull; + enum gpio_drv_strength strength; + + if (gc->of_gpio_n_cells < 2) + return -EINVAL; + + if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells)) + return -EINVAL; + + if (gpiospec->args[0] >= gc->ngpio) + return -EINVAL; + + pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK; + if (WARN_ON(pull >= GPIO_PULL_INVALID)) + return -EINVAL; + + strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) & + GPIO_DRV_STRENGTH_BIT_MASK; + + if (flags) + *flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK; + + cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull); + cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength); + + return gpiospec->args[0]; +} +#endif + +static const struct of_device_id cygnus_gpio_of_match[] = { + { .compatible = "brcm,cygnus-gpio" }, + { } +}; +MODULE_DEVICE_TABLE(of, cygnus_gpio_of_match); + +static int cygnus_gpio_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct resource *res; + struct cygnus_gpio *cygnus_gpio; + struct gpio_chip *gc; + u32 i, ngpios; + int ret; + + cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL); + if (!cygnus_gpio) + return -ENOMEM; + + cygnus_gpio->dev = dev; + platform_set_drvdata(pdev, cygnus_gpio); + + if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) { + dev_err(&pdev->dev, "missing ngpios DT property\n"); + return -ENODEV; + } + cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) / + NGPIOS_PER_BANK; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + cygnus_gpio->base = devm_ioremap_resource(dev, res); + if (IS_ERR(cygnus_gpio->base)) { + dev_err(&pdev->dev, "unable to map I/O memory\n"); + return PTR_ERR(cygnus_gpio->base); + } + + /* + * Only certain types of Cygnus GPIO interfaces have I/O control + * registers + */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (res) { + cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res); + if (IS_ERR(cygnus_gpio->io_ctrl)) { + dev_err(&pdev->dev, "unable to map I/O memory\n"); + return PTR_ERR(cygnus_gpio->io_ctrl); + } + } + + spin_lock_init(&cygnus_gpio->lock); + + gc = &cygnus_gpio->gc; + gc->base = -1; + gc->ngpio = ngpios; + gc->label = dev_name(dev); + gc->dev = dev; +#ifdef CONFIG_OF_GPIO + gc->of_node = dev->of_node; + gc->of_gpio_n_cells = 2; + gc->of_xlate = cygnus_gpio_of_xlate; +#endif + gc->direction_input = cygnus_gpio_direction_input; + gc->direction_output = cygnus_gpio_direction_output; + gc->set = cygnus_gpio_set; + gc->get = cygnus_gpio_get; + gc->to_irq = cygnus_gpio_to_irq; + + ret = gpiochip_add(gc); + if (ret < 0) { + dev_err(&pdev->dev, "unable to add GPIO chip\n"); + return ret; + } + + /* + * Some of the GPIO interfaces do not have interrupt wired to the main + * processor + */ + cygnus_gpio->irq = platform_get_irq(pdev, 0); + if (cygnus_gpio->irq < 0) { + ret = cygnus_gpio->irq; + if (ret == -EPROBE_DEFER) + goto err_rm_gpiochip; + + dev_info(&pdev->dev, "no interrupt hook\n"); + } + + cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node, + gc->ngpio, &cygnus_irq_ops, cygnus_gpio); + if (!cygnus_gpio->irq_domain) { + dev_err(&pdev->dev, "unable to allocate IRQ domain\n"); + ret = -ENXIO; + goto err_rm_gpiochip; + } + + for (i = 0; i < gc->ngpio; i++) { + int irq = irq_create_mapping(cygnus_gpio->irq_domain, i); + + irq_set_lockdep_class(irq, &gpio_lock_class); + irq_set_chip_data(irq, cygnus_gpio); + irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip, + handle_simple_irq); + set_irq_flags(irq, IRQF_VALID); + } + + irq_set_chained_handler(cygnus_gpio->irq, cygnus_gpio_irq_handler); + irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio); + + return 0; + +err_rm_gpiochip: + gpiochip_remove(gc); + return ret; +} + +static struct platform_driver cygnus_gpio_driver = { + .driver = { + .name = "bcm-cygnus-gpio", + .owner = THIS_MODULE, + .of_match_table = cygnus_gpio_of_match, + }, + .probe = cygnus_gpio_probe, +}; + +module_platform_driver(cygnus_gpio_driver); + +MODULE_AUTHOR("Ray Jui "); +MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver"); +MODULE_LICENSE("GPL v2");