[PATCH v4 2/5] gpio: Cygnus: add GPIO driver

Ray Jui
2014-12-08T20:41:38Z

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 <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
drivers/gpio/Kconfig | 11 +
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-bcm-cygnus.c | 705 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 717 insertions(+)
create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 633ec21..3e3b0342 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -126,6 +126,17 @@ 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
+ 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..4fd9b73
--- /dev/null
+++ b/drivers/gpio/gpio-bcm-cygnus.c
@@ -0,0 +1,705 @@
+/*
+ * 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 <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip/chained_irq.h>
+
+#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_BIT(pin) ((pin) % NGPIOS_PER_BANK)
+#define GPIO_BANK(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 bcm_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 unsigned int gpio_base_index;
+
+static struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(struct gpio_chip *gc)
+{
+ return container_of(gc, struct bcm_cygnus_gpio, gc);
+}
+
+static int bcm_cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+ struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+
+ return irq_find_mapping(cygnus_gpio->irq_domain, offset);
+}
+
+static unsigned int __gpio_reg_offset(struct bcm_cygnus_gpio *cygnus_gpio,
+ unsigned gpio)
+{
+ return GPIO_BANK(gpio) * GPIO_BANK_SIZE;
+}
+
+static unsigned int __gpio_bitpos(struct bcm_cygnus_gpio *cygnus_gpio,
+ unsigned gpio)
+{
+ return GPIO_BIT(gpio);
+}
+
+static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
+ struct irq_desc *desc)
+{
+ struct bcm_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 = readl(cygnus_gpio->base +
+ (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 =
+ bcm_cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
+
+ /*
+ * Clear the interrupt before invoking the
+ * handler, so we do not leave any window
+ */
+ writel(1 << bit,
+ cygnus_gpio->base + (i * GPIO_BANK_SIZE) +
+ CYGNUS_GPIO_INT_CLR_OFFSET);
+
+ generic_handle_irq(child_irq);
+ }
+ }
+
+ chained_irq_exit(chip, desc);
+}
+
+static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
+{
+ struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+ unsigned gpio = d->hwirq;
+ unsigned int offset, shift;
+ u32 val;
+
+ offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+ CYGNUS_GPIO_INT_CLR_OFFSET;
+ shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+ val = 1 << shift;
+ writel(val, cygnus_gpio->base + offset);
+
+ dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+ offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_mask(struct irq_data *d)
+{
+ struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+ unsigned gpio = d->hwirq;
+ unsigned int offset, shift;
+ u32 val;
+ unsigned long flags;
+
+ offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+ CYGNUS_GPIO_INT_MSK_OFFSET;
+ shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+ spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+ val = readl(cygnus_gpio->base + offset);
+ val &= ~(1 << shift);
+ writel(val, cygnus_gpio->base + offset);
+
+ spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+ dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+ offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+ struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+ unsigned gpio = d->hwirq;
+ unsigned int offset, shift;
+ u32 val;
+ unsigned long flags;
+
+ offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+ CYGNUS_GPIO_INT_MSK_OFFSET;
+ shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+ spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+ val = readl(cygnus_gpio->base + offset);
+ val |= 1 << shift;
+ writel(val, cygnus_gpio->base + offset);
+
+ spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+ dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+ offset, shift);
+}
+
+static int bcm_cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+ struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+ unsigned gpio = d->hwirq;
+ unsigned int int_type, dual_edge, edge_lvl;
+ unsigned int offset, shift;
+ u32 val;
+ unsigned long flags;
+
+ switch (type & IRQ_TYPE_SENSE_MASK) {
+ case IRQ_TYPE_EDGE_RISING:
+ int_type = 0;
+ dual_edge = 0;
+ edge_lvl = 1;
+ break;
+
+ case IRQ_TYPE_EDGE_FALLING:
+ int_type = 0;
+ dual_edge = 0;
+ edge_lvl = 0;
+ break;
+
+ case IRQ_TYPE_EDGE_BOTH:
+ int_type = 0;
+ dual_edge = 1;
+ edge_lvl = 0;
+ break;
+
+ case IRQ_TYPE_LEVEL_HIGH:
+ int_type = 1;
+ dual_edge = 0;
+ edge_lvl = 1;
+ break;
+
+ case IRQ_TYPE_LEVEL_LOW:
+ int_type = 1;
+ dual_edge = 0;
+ edge_lvl = 0;
+ break;
+
+ default:
+ dev_err(cygnus_gpio->dev, "invalid GPIO irq type 0x%x\n", type);
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+ shift = __gpio_bitpos(cygnus_gpio, gpio);
+ offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+ CYGNUS_GPIO_IN_TYPE_OFFSET;
+ val = readl(cygnus_gpio->base + offset);
+ val &= ~(1 << shift);
+ val |= int_type << shift;
+ writel(val, cygnus_gpio->base + offset);
+
+ offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+ CYGNUS_GPIO_INT_DE_OFFSET;
+ val = readl(cygnus_gpio->base + offset);
+ val &= ~(1 << shift);
+ val |= dual_edge << shift;
+ writel(val, cygnus_gpio->base + offset);
+
+ offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+ CYGNUS_GPIO_INT_EDGE_OFFSET;
+ val = readl(cygnus_gpio->base + offset);
+ val &= ~(1 << shift);
+ val |= edge_lvl << shift;
+ writel(val, cygnus_gpio->base + offset);
+
+ spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+ return 0;
+}
+
+static struct irq_chip bcm_cygnus_gpio_irq_chip = {
+ .name = "bcm-cygnus-gpio",
+ .irq_ack = bcm_cygnus_gpio_irq_ack,
+ .irq_mask = bcm_cygnus_gpio_irq_mask,
+ .irq_unmask = bcm_cygnus_gpio_irq_unmask,
+ .irq_set_type = bcm_cygnus_gpio_irq_set_type,
+};
+
+static int bcm_cygnus_gpio_direction_input(struct gpio_chip *gc,
+ unsigned gpio)
+{
+ struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+ unsigned int offset, shift;
+ u32 val;
+ unsigned long flags;
+
+ offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+ CYGNUS_GPIO_OUT_EN_OFFSET;
+ shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+ spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+ val = readl(cygnus_gpio->base + offset);
+ val &= ~(1 << shift);
+ writel(val, cygnus_gpio->base + offset);
+
+ spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+ dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+ offset, shift);
+
+ return 0;
+}
+
+static int bcm_cygnus_gpio_direction_output(struct gpio_chip *gc,
+ unsigned gpio, int value)
+{
+ struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+ unsigned int offset, shift;
+ u32 val;
+ unsigned long flags;
+
+ offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+ CYGNUS_GPIO_OUT_EN_OFFSET;
+ shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+ spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+ val = readl(cygnus_gpio->base + offset);
+ val |= 1 << shift;
+ writel(val, cygnus_gpio->base + offset);
+
+ dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+ offset, shift);
+
+ offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+ CYGNUS_GPIO_DATA_OUT_OFFSET;
+
+ val = readl(cygnus_gpio->base + offset);
+ if (value)
+ val |= 1 << shift;
+ else
+ val &= ~(1 << shift);
+ writel(val, cygnus_gpio->base + offset);
+
+ spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+ dev_dbg(cygnus_gpio->dev,
+ "gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+ gpio, offset, shift, val);
+
+ return 0;
+}
+
+static void bcm_cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
+ int value)
+{
+ struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+ unsigned int offset, shift;
+ u32 val;
+ unsigned long flags;
+
+ offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+ CYGNUS_GPIO_DATA_OUT_OFFSET;
+ shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+ spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+ val = readl(cygnus_gpio->base + offset);
+ if (value)
+ val |= 1 << shift;
+ else
+ val &= ~(1 << shift);
+ writel(val, cygnus_gpio->base + offset);
+
+ spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+ dev_dbg(cygnus_gpio->dev,
+ "gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+ gpio, offset, shift, val);
+}
+
+static int bcm_cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+ struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+ unsigned int offset, shift;
+ u32 val;
+
+ offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+ CYGNUS_GPIO_DATA_IN_OFFSET;
+ shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+ val = readl(cygnus_gpio->base + offset);
+ val = (val >> shift) & 1;
+
+ dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u val:%u\n",
+ gpio, offset, shift, val);
+
+ return val;
+}
+
+static struct lock_class_key gpio_lock_class;
+
+static int bcm_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, &bcm_cygnus_gpio_irq_chip,
+ handle_simple_irq);
+ set_irq_flags(irq, IRQF_VALID);
+
+ return 0;
+}
+
+static void bcm_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 bcm_cygnus_irq_ops = {
+ .map = bcm_cygnus_gpio_irq_map,
+ .unmap = bcm_cygnus_gpio_irq_unmap,
+ .xlate = irq_domain_xlate_twocell,
+};
+
+#ifdef CONFIG_OF_GPIO
+static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
+ unsigned gpio, enum gpio_pull pull)
+{
+ unsigned int offset, shift;
+ u32 val, 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 */
+ offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+ CYGNUS_GPIO_PAD_RES_OFFSET;
+ shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+ val = readl(cygnus_gpio->base + offset);
+ val &= ~(1 << shift);
+ if (pullup)
+ val |= 1 << shift;
+ writel(val, cygnus_gpio->base + offset);
+
+ /* enable pad */
+ offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+ CYGNUS_GPIO_RES_EN_OFFSET;
+ val = readl(cygnus_gpio->base + offset);
+ val |= 1 << shift;
+ writel(val, cygnus_gpio->base + offset);
+
+ spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static void bcm_cygnus_gpio_set_strength(struct bcm_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;
+
+ if (cygnus_gpio->io_ctrl) {
+ base = cygnus_gpio->io_ctrl;
+ offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
+ } else {
+ base = cygnus_gpio->base;
+ offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+ CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET;
+ }
+
+ shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+ spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+ for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+ val = readl(base + offset);
+ val &= ~(1 << shift);
+ val |= ((strength >> i) & 0x1) << shift;
+ writel(val, base + offset);
+ offset += 4;
+ }
+
+ spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static int bcm_cygnus_gpio_of_xlate(struct gpio_chip *gc,
+ const struct of_phandle_args *gpiospec, u32 *flags)
+{
+ struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_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;
+
+ bcm_cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
+ bcm_cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
+
+ return gpiospec->args[0];
+}
+#endif
+
+static const struct of_device_id bcm_cygnus_gpio_of_match[] = {
+ { .compatible = "brcm,cygnus-gpio" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, bcm_cygnus_gpio_of_match);
+
+static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ const struct of_device_id *match;
+ struct resource *res;
+ struct bcm_cygnus_gpio *cygnus_gpio;
+ struct gpio_chip *gc;
+ u32 i, ngpios;
+ int ret;
+
+ match = of_match_device(bcm_cygnus_gpio_of_match, dev);
+ if (!match) {
+ dev_err(&pdev->dev, "failed to find GPIO controller\n");
+ return -ENODEV;
+ }
+
+ 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 device tree property\n");
+ return -ENODEV;
+ }
+ cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
+ NGPIOS_PER_BANK;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "unable to get I/O resource\n");
+ return -ENODEV;
+ }
+
+ 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 = gpio_base_index;
+ gpio_base_index += ngpios;
+ 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 = bcm_cygnus_gpio_of_xlate;
+#endif
+ gc->direction_input = bcm_cygnus_gpio_direction_input;
+ gc->direction_output = bcm_cygnus_gpio_direction_output;
+ gc->set = bcm_cygnus_gpio_set;
+ gc->get = bcm_cygnus_gpio_get;
+ gc->to_irq = bcm_cygnus_gpio_to_irq;
+
+ ret = gpiochip_add(gc);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "unable to add GPIO chip\n");
+ goto err_dec_gpio_base;
+ }
+
+ /*
+ * 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, &bcm_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, &bcm_cygnus_gpio_irq_chip,
+ handle_simple_irq);
+ set_irq_flags(irq, IRQF_VALID);
+ }
+
+ irq_set_chained_handler(cygnus_gpio->irq, bcm_cygnus_gpio_irq_handler);
+ irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);
+
+ return 0;
+
+err_rm_gpiochip:
+ gpiochip_remove(gc);
+
+err_dec_gpio_base:
+ gpio_base_index -= ngpios;
+ return ret;
+}
+
+static struct platform_driver bcm_cygnus_gpio_driver = {
+ .driver = {
+ .name = "bcm-cygnus-gpio",
+ .owner = THIS_MODULE,
+ .of_match_table = bcm_cygnus_gpio_of_match,
+ },
+ .probe = bcm_cygnus_gpio_probe,
+};
+
+module_platform_driver(bcm_cygnus_gpio_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
--
1.7.9.5