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path: root/drivers/gpio/gpio-dwapb.c
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-rw-r--r--drivers/gpio/gpio-dwapb.c852
1 files changed, 852 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
new file mode 100644
index 0000000000..6b7d47a52b
--- /dev/null
+++ b/drivers/gpio/gpio-dwapb.c
@@ -0,0 +1,852 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2011 Jamie Iles
+ *
+ * All enquiries to support@picochip.com
+ */
+#include <linux/acpi.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/gpio/driver.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/irq.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/reset.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+#include "gpiolib.h"
+#include "gpiolib-acpi.h"
+
+#define GPIO_SWPORTA_DR 0x00
+#define GPIO_SWPORTA_DDR 0x04
+#define GPIO_SWPORTB_DR 0x0c
+#define GPIO_SWPORTB_DDR 0x10
+#define GPIO_SWPORTC_DR 0x18
+#define GPIO_SWPORTC_DDR 0x1c
+#define GPIO_SWPORTD_DR 0x24
+#define GPIO_SWPORTD_DDR 0x28
+#define GPIO_INTEN 0x30
+#define GPIO_INTMASK 0x34
+#define GPIO_INTTYPE_LEVEL 0x38
+#define GPIO_INT_POLARITY 0x3c
+#define GPIO_INTSTATUS 0x40
+#define GPIO_PORTA_DEBOUNCE 0x48
+#define GPIO_PORTA_EOI 0x4c
+#define GPIO_EXT_PORTA 0x50
+#define GPIO_EXT_PORTB 0x54
+#define GPIO_EXT_PORTC 0x58
+#define GPIO_EXT_PORTD 0x5c
+
+#define DWAPB_DRIVER_NAME "gpio-dwapb"
+#define DWAPB_MAX_PORTS 4
+#define DWAPB_MAX_GPIOS 32
+
+#define GPIO_EXT_PORT_STRIDE 0x04 /* register stride 32 bits */
+#define GPIO_SWPORT_DR_STRIDE 0x0c /* register stride 3*32 bits */
+#define GPIO_SWPORT_DDR_STRIDE 0x0c /* register stride 3*32 bits */
+
+#define GPIO_REG_OFFSET_V1 0
+#define GPIO_REG_OFFSET_V2 1
+#define GPIO_REG_OFFSET_MASK BIT(0)
+
+#define GPIO_INTMASK_V2 0x44
+#define GPIO_INTTYPE_LEVEL_V2 0x34
+#define GPIO_INT_POLARITY_V2 0x38
+#define GPIO_INTSTATUS_V2 0x3c
+#define GPIO_PORTA_EOI_V2 0x40
+
+#define DWAPB_NR_CLOCKS 2
+
+struct dwapb_gpio;
+
+struct dwapb_port_property {
+ struct fwnode_handle *fwnode;
+ unsigned int idx;
+ unsigned int ngpio;
+ unsigned int gpio_base;
+ int irq[DWAPB_MAX_GPIOS];
+};
+
+struct dwapb_platform_data {
+ struct dwapb_port_property *properties;
+ unsigned int nports;
+};
+
+#ifdef CONFIG_PM_SLEEP
+/* Store GPIO context across system-wide suspend/resume transitions */
+struct dwapb_context {
+ u32 data;
+ u32 dir;
+ u32 ext;
+ u32 int_en;
+ u32 int_mask;
+ u32 int_type;
+ u32 int_pol;
+ u32 int_deb;
+ u32 wake_en;
+};
+#endif
+
+struct dwapb_gpio_port_irqchip {
+ unsigned int nr_irqs;
+ unsigned int irq[DWAPB_MAX_GPIOS];
+};
+
+struct dwapb_gpio_port {
+ struct gpio_chip gc;
+ struct dwapb_gpio_port_irqchip *pirq;
+ struct dwapb_gpio *gpio;
+#ifdef CONFIG_PM_SLEEP
+ struct dwapb_context *ctx;
+#endif
+ unsigned int idx;
+};
+#define to_dwapb_gpio(_gc) \
+ (container_of(_gc, struct dwapb_gpio_port, gc)->gpio)
+
+struct dwapb_gpio {
+ struct device *dev;
+ void __iomem *regs;
+ struct dwapb_gpio_port *ports;
+ unsigned int nr_ports;
+ unsigned int flags;
+ struct reset_control *rst;
+ struct clk_bulk_data clks[DWAPB_NR_CLOCKS];
+};
+
+static inline u32 gpio_reg_v2_convert(unsigned int offset)
+{
+ switch (offset) {
+ case GPIO_INTMASK:
+ return GPIO_INTMASK_V2;
+ case GPIO_INTTYPE_LEVEL:
+ return GPIO_INTTYPE_LEVEL_V2;
+ case GPIO_INT_POLARITY:
+ return GPIO_INT_POLARITY_V2;
+ case GPIO_INTSTATUS:
+ return GPIO_INTSTATUS_V2;
+ case GPIO_PORTA_EOI:
+ return GPIO_PORTA_EOI_V2;
+ }
+
+ return offset;
+}
+
+static inline u32 gpio_reg_convert(struct dwapb_gpio *gpio, unsigned int offset)
+{
+ if ((gpio->flags & GPIO_REG_OFFSET_MASK) == GPIO_REG_OFFSET_V2)
+ return gpio_reg_v2_convert(offset);
+
+ return offset;
+}
+
+static inline u32 dwapb_read(struct dwapb_gpio *gpio, unsigned int offset)
+{
+ struct gpio_chip *gc = &gpio->ports[0].gc;
+ void __iomem *reg_base = gpio->regs;
+
+ return gc->read_reg(reg_base + gpio_reg_convert(gpio, offset));
+}
+
+static inline void dwapb_write(struct dwapb_gpio *gpio, unsigned int offset,
+ u32 val)
+{
+ struct gpio_chip *gc = &gpio->ports[0].gc;
+ void __iomem *reg_base = gpio->regs;
+
+ gc->write_reg(reg_base + gpio_reg_convert(gpio, offset), val);
+}
+
+static struct dwapb_gpio_port *dwapb_offs_to_port(struct dwapb_gpio *gpio, unsigned int offs)
+{
+ struct dwapb_gpio_port *port;
+ int i;
+
+ for (i = 0; i < gpio->nr_ports; i++) {
+ port = &gpio->ports[i];
+ if (port->idx == offs / DWAPB_MAX_GPIOS)
+ return port;
+ }
+
+ return NULL;
+}
+
+static void dwapb_toggle_trigger(struct dwapb_gpio *gpio, unsigned int offs)
+{
+ struct dwapb_gpio_port *port = dwapb_offs_to_port(gpio, offs);
+ struct gpio_chip *gc;
+ u32 pol;
+ int val;
+
+ if (!port)
+ return;
+ gc = &port->gc;
+
+ pol = dwapb_read(gpio, GPIO_INT_POLARITY);
+ /* Just read the current value right out of the data register */
+ val = gc->get(gc, offs % DWAPB_MAX_GPIOS);
+ if (val)
+ pol &= ~BIT(offs);
+ else
+ pol |= BIT(offs);
+
+ dwapb_write(gpio, GPIO_INT_POLARITY, pol);
+}
+
+static u32 dwapb_do_irq(struct dwapb_gpio *gpio)
+{
+ struct gpio_chip *gc = &gpio->ports[0].gc;
+ unsigned long irq_status;
+ irq_hw_number_t hwirq;
+
+ irq_status = dwapb_read(gpio, GPIO_INTSTATUS);
+ for_each_set_bit(hwirq, &irq_status, DWAPB_MAX_GPIOS) {
+ int gpio_irq = irq_find_mapping(gc->irq.domain, hwirq);
+ u32 irq_type = irq_get_trigger_type(gpio_irq);
+
+ generic_handle_irq(gpio_irq);
+
+ if ((irq_type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
+ dwapb_toggle_trigger(gpio, hwirq);
+ }
+
+ return irq_status;
+}
+
+static void dwapb_irq_handler(struct irq_desc *desc)
+{
+ struct dwapb_gpio *gpio = irq_desc_get_handler_data(desc);
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+
+ chained_irq_enter(chip, desc);
+ dwapb_do_irq(gpio);
+ chained_irq_exit(chip, desc);
+}
+
+static irqreturn_t dwapb_irq_handler_mfd(int irq, void *dev_id)
+{
+ return IRQ_RETVAL(dwapb_do_irq(dev_id));
+}
+
+static void dwapb_irq_ack(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct dwapb_gpio *gpio = to_dwapb_gpio(gc);
+ u32 val = BIT(irqd_to_hwirq(d));
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
+ dwapb_write(gpio, GPIO_PORTA_EOI, val);
+ raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+}
+
+static void dwapb_irq_mask(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct dwapb_gpio *gpio = to_dwapb_gpio(gc);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
+ unsigned long flags;
+ u32 val;
+
+ raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
+ val = dwapb_read(gpio, GPIO_INTMASK) | BIT(hwirq);
+ dwapb_write(gpio, GPIO_INTMASK, val);
+ raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+
+ gpiochip_disable_irq(gc, hwirq);
+}
+
+static void dwapb_irq_unmask(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct dwapb_gpio *gpio = to_dwapb_gpio(gc);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
+ unsigned long flags;
+ u32 val;
+
+ gpiochip_enable_irq(gc, hwirq);
+
+ raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
+ val = dwapb_read(gpio, GPIO_INTMASK) & ~BIT(hwirq);
+ dwapb_write(gpio, GPIO_INTMASK, val);
+ raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+}
+
+static void dwapb_irq_enable(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct dwapb_gpio *gpio = to_dwapb_gpio(gc);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
+ unsigned long flags;
+ u32 val;
+
+ raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
+ val = dwapb_read(gpio, GPIO_INTEN) | BIT(hwirq);
+ dwapb_write(gpio, GPIO_INTEN, val);
+ val = dwapb_read(gpio, GPIO_INTMASK) & ~BIT(hwirq);
+ dwapb_write(gpio, GPIO_INTMASK, val);
+ raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+}
+
+static void dwapb_irq_disable(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct dwapb_gpio *gpio = to_dwapb_gpio(gc);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
+ unsigned long flags;
+ u32 val;
+
+ raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
+ val = dwapb_read(gpio, GPIO_INTMASK) | BIT(hwirq);
+ dwapb_write(gpio, GPIO_INTMASK, val);
+ val = dwapb_read(gpio, GPIO_INTEN) & ~BIT(hwirq);
+ dwapb_write(gpio, GPIO_INTEN, val);
+ raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+}
+
+static int dwapb_irq_set_type(struct irq_data *d, u32 type)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct dwapb_gpio *gpio = to_dwapb_gpio(gc);
+ irq_hw_number_t bit = irqd_to_hwirq(d);
+ unsigned long level, polarity, flags;
+
+ raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
+ level = dwapb_read(gpio, GPIO_INTTYPE_LEVEL);
+ polarity = dwapb_read(gpio, GPIO_INT_POLARITY);
+
+ switch (type) {
+ case IRQ_TYPE_EDGE_BOTH:
+ level |= BIT(bit);
+ dwapb_toggle_trigger(gpio, bit);
+ break;
+ case IRQ_TYPE_EDGE_RISING:
+ level |= BIT(bit);
+ polarity |= BIT(bit);
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ level |= BIT(bit);
+ polarity &= ~BIT(bit);
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ level &= ~BIT(bit);
+ polarity |= BIT(bit);
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ level &= ~BIT(bit);
+ polarity &= ~BIT(bit);
+ break;
+ }
+
+ if (type & IRQ_TYPE_LEVEL_MASK)
+ irq_set_handler_locked(d, handle_level_irq);
+ else if (type & IRQ_TYPE_EDGE_BOTH)
+ irq_set_handler_locked(d, handle_edge_irq);
+
+ dwapb_write(gpio, GPIO_INTTYPE_LEVEL, level);
+ if (type != IRQ_TYPE_EDGE_BOTH)
+ dwapb_write(gpio, GPIO_INT_POLARITY, polarity);
+ raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int dwapb_irq_set_wake(struct irq_data *d, unsigned int enable)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct dwapb_gpio *gpio = to_dwapb_gpio(gc);
+ struct dwapb_context *ctx = gpio->ports[0].ctx;
+ irq_hw_number_t bit = irqd_to_hwirq(d);
+
+ if (enable)
+ ctx->wake_en |= BIT(bit);
+ else
+ ctx->wake_en &= ~BIT(bit);
+
+ return 0;
+}
+#else
+#define dwapb_irq_set_wake NULL
+#endif
+
+static const struct irq_chip dwapb_irq_chip = {
+ .name = DWAPB_DRIVER_NAME,
+ .irq_ack = dwapb_irq_ack,
+ .irq_mask = dwapb_irq_mask,
+ .irq_unmask = dwapb_irq_unmask,
+ .irq_set_type = dwapb_irq_set_type,
+ .irq_enable = dwapb_irq_enable,
+ .irq_disable = dwapb_irq_disable,
+ .irq_set_wake = dwapb_irq_set_wake,
+ .flags = IRQCHIP_IMMUTABLE,
+ GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
+static int dwapb_gpio_set_debounce(struct gpio_chip *gc,
+ unsigned offset, unsigned debounce)
+{
+ struct dwapb_gpio_port *port = gpiochip_get_data(gc);
+ struct dwapb_gpio *gpio = port->gpio;
+ unsigned long flags, val_deb;
+ unsigned long mask = BIT(offset);
+
+ raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
+
+ val_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE);
+ if (debounce)
+ val_deb |= mask;
+ else
+ val_deb &= ~mask;
+ dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, val_deb);
+
+ raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+
+ return 0;
+}
+
+static int dwapb_gpio_set_config(struct gpio_chip *gc, unsigned offset,
+ unsigned long config)
+{
+ u32 debounce;
+
+ if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
+ return -ENOTSUPP;
+
+ debounce = pinconf_to_config_argument(config);
+ return dwapb_gpio_set_debounce(gc, offset, debounce);
+}
+
+static int dwapb_convert_irqs(struct dwapb_gpio_port_irqchip *pirq,
+ struct dwapb_port_property *pp)
+{
+ int i;
+
+ /* Group all available IRQs into an array of parental IRQs. */
+ for (i = 0; i < pp->ngpio; ++i) {
+ if (!pp->irq[i])
+ continue;
+
+ pirq->irq[pirq->nr_irqs++] = pp->irq[i];
+ }
+
+ return pirq->nr_irqs ? 0 : -ENOENT;
+}
+
+static void dwapb_configure_irqs(struct dwapb_gpio *gpio,
+ struct dwapb_gpio_port *port,
+ struct dwapb_port_property *pp)
+{
+ struct dwapb_gpio_port_irqchip *pirq;
+ struct gpio_chip *gc = &port->gc;
+ struct gpio_irq_chip *girq;
+ int err;
+
+ pirq = devm_kzalloc(gpio->dev, sizeof(*pirq), GFP_KERNEL);
+ if (!pirq)
+ return;
+
+ if (dwapb_convert_irqs(pirq, pp)) {
+ dev_warn(gpio->dev, "no IRQ for port%d\n", pp->idx);
+ goto err_kfree_pirq;
+ }
+
+ girq = &gc->irq;
+ girq->handler = handle_bad_irq;
+ girq->default_type = IRQ_TYPE_NONE;
+
+ port->pirq = pirq;
+
+ /*
+ * Intel ACPI-based platforms mostly have the DesignWare APB GPIO
+ * IRQ lane shared between several devices. In that case the parental
+ * IRQ has to be handled in the shared way so to be properly delivered
+ * to all the connected devices.
+ */
+ if (has_acpi_companion(gpio->dev)) {
+ girq->num_parents = 0;
+ girq->parents = NULL;
+ girq->parent_handler = NULL;
+
+ err = devm_request_irq(gpio->dev, pp->irq[0],
+ dwapb_irq_handler_mfd,
+ IRQF_SHARED, DWAPB_DRIVER_NAME, gpio);
+ if (err) {
+ dev_err(gpio->dev, "error requesting IRQ\n");
+ goto err_kfree_pirq;
+ }
+ } else {
+ girq->num_parents = pirq->nr_irqs;
+ girq->parents = pirq->irq;
+ girq->parent_handler_data = gpio;
+ girq->parent_handler = dwapb_irq_handler;
+ }
+
+ gpio_irq_chip_set_chip(girq, &dwapb_irq_chip);
+
+ return;
+
+err_kfree_pirq:
+ devm_kfree(gpio->dev, pirq);
+}
+
+static int dwapb_gpio_add_port(struct dwapb_gpio *gpio,
+ struct dwapb_port_property *pp,
+ unsigned int offs)
+{
+ struct dwapb_gpio_port *port;
+ void __iomem *dat, *set, *dirout;
+ int err;
+
+ port = &gpio->ports[offs];
+ port->gpio = gpio;
+ port->idx = pp->idx;
+
+#ifdef CONFIG_PM_SLEEP
+ port->ctx = devm_kzalloc(gpio->dev, sizeof(*port->ctx), GFP_KERNEL);
+ if (!port->ctx)
+ return -ENOMEM;
+#endif
+
+ dat = gpio->regs + GPIO_EXT_PORTA + pp->idx * GPIO_EXT_PORT_STRIDE;
+ set = gpio->regs + GPIO_SWPORTA_DR + pp->idx * GPIO_SWPORT_DR_STRIDE;
+ dirout = gpio->regs + GPIO_SWPORTA_DDR + pp->idx * GPIO_SWPORT_DDR_STRIDE;
+
+ /* This registers 32 GPIO lines per port */
+ err = bgpio_init(&port->gc, gpio->dev, 4, dat, set, NULL, dirout,
+ NULL, 0);
+ if (err) {
+ dev_err(gpio->dev, "failed to init gpio chip for port%d\n",
+ port->idx);
+ return err;
+ }
+
+ port->gc.fwnode = pp->fwnode;
+ port->gc.ngpio = pp->ngpio;
+ port->gc.base = pp->gpio_base;
+
+ /* Only port A support debounce */
+ if (pp->idx == 0)
+ port->gc.set_config = dwapb_gpio_set_config;
+
+ /* Only port A can provide interrupts in all configurations of the IP */
+ if (pp->idx == 0)
+ dwapb_configure_irqs(gpio, port, pp);
+
+ err = devm_gpiochip_add_data(gpio->dev, &port->gc, port);
+ if (err) {
+ dev_err(gpio->dev, "failed to register gpiochip for port%d\n",
+ port->idx);
+ return err;
+ }
+
+ return 0;
+}
+
+static void dwapb_get_irq(struct device *dev, struct fwnode_handle *fwnode,
+ struct dwapb_port_property *pp)
+{
+ int irq, j;
+
+ for (j = 0; j < pp->ngpio; j++) {
+ if (has_acpi_companion(dev))
+ irq = platform_get_irq_optional(to_platform_device(dev), j);
+ else
+ irq = fwnode_irq_get(fwnode, j);
+ if (irq > 0)
+ pp->irq[j] = irq;
+ }
+}
+
+static struct dwapb_platform_data *dwapb_gpio_get_pdata(struct device *dev)
+{
+ struct fwnode_handle *fwnode;
+ struct dwapb_platform_data *pdata;
+ struct dwapb_port_property *pp;
+ int nports;
+ int i;
+
+ nports = device_get_child_node_count(dev);
+ if (nports == 0)
+ return ERR_PTR(-ENODEV);
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return ERR_PTR(-ENOMEM);
+
+ pdata->properties = devm_kcalloc(dev, nports, sizeof(*pp), GFP_KERNEL);
+ if (!pdata->properties)
+ return ERR_PTR(-ENOMEM);
+
+ pdata->nports = nports;
+
+ i = 0;
+ device_for_each_child_node(dev, fwnode) {
+ pp = &pdata->properties[i++];
+ pp->fwnode = fwnode;
+
+ if (fwnode_property_read_u32(fwnode, "reg", &pp->idx) ||
+ pp->idx >= DWAPB_MAX_PORTS) {
+ dev_err(dev,
+ "missing/invalid port index for port%d\n", i);
+ fwnode_handle_put(fwnode);
+ return ERR_PTR(-EINVAL);
+ }
+
+ if (fwnode_property_read_u32(fwnode, "ngpios", &pp->ngpio) &&
+ fwnode_property_read_u32(fwnode, "snps,nr-gpios", &pp->ngpio)) {
+ dev_info(dev,
+ "failed to get number of gpios for port%d\n",
+ i);
+ pp->ngpio = DWAPB_MAX_GPIOS;
+ }
+
+ pp->gpio_base = -1;
+
+ /* For internal use only, new platforms mustn't exercise this */
+ if (is_software_node(fwnode))
+ fwnode_property_read_u32(fwnode, "gpio-base", &pp->gpio_base);
+
+ /*
+ * Only port A can provide interrupts in all configurations of
+ * the IP.
+ */
+ if (pp->idx == 0)
+ dwapb_get_irq(dev, fwnode, pp);
+ }
+
+ return pdata;
+}
+
+static void dwapb_assert_reset(void *data)
+{
+ struct dwapb_gpio *gpio = data;
+
+ reset_control_assert(gpio->rst);
+}
+
+static int dwapb_get_reset(struct dwapb_gpio *gpio)
+{
+ int err;
+
+ gpio->rst = devm_reset_control_get_optional_shared(gpio->dev, NULL);
+ if (IS_ERR(gpio->rst))
+ return dev_err_probe(gpio->dev, PTR_ERR(gpio->rst),
+ "Cannot get reset descriptor\n");
+
+ err = reset_control_deassert(gpio->rst);
+ if (err) {
+ dev_err(gpio->dev, "Cannot deassert reset lane\n");
+ return err;
+ }
+
+ return devm_add_action_or_reset(gpio->dev, dwapb_assert_reset, gpio);
+}
+
+static void dwapb_disable_clks(void *data)
+{
+ struct dwapb_gpio *gpio = data;
+
+ clk_bulk_disable_unprepare(DWAPB_NR_CLOCKS, gpio->clks);
+}
+
+static int dwapb_get_clks(struct dwapb_gpio *gpio)
+{
+ int err;
+
+ /* Optional bus and debounce clocks */
+ gpio->clks[0].id = "bus";
+ gpio->clks[1].id = "db";
+ err = devm_clk_bulk_get_optional(gpio->dev, DWAPB_NR_CLOCKS,
+ gpio->clks);
+ if (err)
+ return dev_err_probe(gpio->dev, err,
+ "Cannot get APB/Debounce clocks\n");
+
+ err = clk_bulk_prepare_enable(DWAPB_NR_CLOCKS, gpio->clks);
+ if (err) {
+ dev_err(gpio->dev, "Cannot enable APB/Debounce clocks\n");
+ return err;
+ }
+
+ return devm_add_action_or_reset(gpio->dev, dwapb_disable_clks, gpio);
+}
+
+static const struct of_device_id dwapb_of_match[] = {
+ { .compatible = "snps,dw-apb-gpio", .data = (void *)GPIO_REG_OFFSET_V1},
+ { .compatible = "apm,xgene-gpio-v2", .data = (void *)GPIO_REG_OFFSET_V2},
+ { /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, dwapb_of_match);
+
+static const struct acpi_device_id dwapb_acpi_match[] = {
+ {"HISI0181", GPIO_REG_OFFSET_V1},
+ {"APMC0D07", GPIO_REG_OFFSET_V1},
+ {"APMC0D81", GPIO_REG_OFFSET_V2},
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, dwapb_acpi_match);
+
+static int dwapb_gpio_probe(struct platform_device *pdev)
+{
+ unsigned int i;
+ struct dwapb_gpio *gpio;
+ int err;
+ struct dwapb_platform_data *pdata;
+ struct device *dev = &pdev->dev;
+
+ pdata = dwapb_gpio_get_pdata(dev);
+ if (IS_ERR(pdata))
+ return PTR_ERR(pdata);
+
+ gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
+ if (!gpio)
+ return -ENOMEM;
+
+ gpio->dev = &pdev->dev;
+ gpio->nr_ports = pdata->nports;
+
+ err = dwapb_get_reset(gpio);
+ if (err)
+ return err;
+
+ gpio->ports = devm_kcalloc(&pdev->dev, gpio->nr_ports,
+ sizeof(*gpio->ports), GFP_KERNEL);
+ if (!gpio->ports)
+ return -ENOMEM;
+
+ gpio->regs = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(gpio->regs))
+ return PTR_ERR(gpio->regs);
+
+ err = dwapb_get_clks(gpio);
+ if (err)
+ return err;
+
+ gpio->flags = (uintptr_t)device_get_match_data(dev);
+
+ for (i = 0; i < gpio->nr_ports; i++) {
+ err = dwapb_gpio_add_port(gpio, &pdata->properties[i], i);
+ if (err)
+ return err;
+ }
+
+ platform_set_drvdata(pdev, gpio);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int dwapb_gpio_suspend(struct device *dev)
+{
+ struct dwapb_gpio *gpio = dev_get_drvdata(dev);
+ struct gpio_chip *gc = &gpio->ports[0].gc;
+ unsigned long flags;
+ int i;
+
+ raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
+ for (i = 0; i < gpio->nr_ports; i++) {
+ unsigned int offset;
+ unsigned int idx = gpio->ports[i].idx;
+ struct dwapb_context *ctx = gpio->ports[i].ctx;
+
+ offset = GPIO_SWPORTA_DDR + idx * GPIO_SWPORT_DDR_STRIDE;
+ ctx->dir = dwapb_read(gpio, offset);
+
+ offset = GPIO_SWPORTA_DR + idx * GPIO_SWPORT_DR_STRIDE;
+ ctx->data = dwapb_read(gpio, offset);
+
+ offset = GPIO_EXT_PORTA + idx * GPIO_EXT_PORT_STRIDE;
+ ctx->ext = dwapb_read(gpio, offset);
+
+ /* Only port A can provide interrupts */
+ if (idx == 0) {
+ ctx->int_mask = dwapb_read(gpio, GPIO_INTMASK);
+ ctx->int_en = dwapb_read(gpio, GPIO_INTEN);
+ ctx->int_pol = dwapb_read(gpio, GPIO_INT_POLARITY);
+ ctx->int_type = dwapb_read(gpio, GPIO_INTTYPE_LEVEL);
+ ctx->int_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE);
+
+ /* Mask out interrupts */
+ dwapb_write(gpio, GPIO_INTMASK, ~ctx->wake_en);
+ }
+ }
+ raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+
+ clk_bulk_disable_unprepare(DWAPB_NR_CLOCKS, gpio->clks);
+
+ return 0;
+}
+
+static int dwapb_gpio_resume(struct device *dev)
+{
+ struct dwapb_gpio *gpio = dev_get_drvdata(dev);
+ struct gpio_chip *gc = &gpio->ports[0].gc;
+ unsigned long flags;
+ int i, err;
+
+ err = clk_bulk_prepare_enable(DWAPB_NR_CLOCKS, gpio->clks);
+ if (err) {
+ dev_err(gpio->dev, "Cannot reenable APB/Debounce clocks\n");
+ return err;
+ }
+
+ raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
+ for (i = 0; i < gpio->nr_ports; i++) {
+ unsigned int offset;
+ unsigned int idx = gpio->ports[i].idx;
+ struct dwapb_context *ctx = gpio->ports[i].ctx;
+
+ offset = GPIO_SWPORTA_DR + idx * GPIO_SWPORT_DR_STRIDE;
+ dwapb_write(gpio, offset, ctx->data);
+
+ offset = GPIO_SWPORTA_DDR + idx * GPIO_SWPORT_DDR_STRIDE;
+ dwapb_write(gpio, offset, ctx->dir);
+
+ offset = GPIO_EXT_PORTA + idx * GPIO_EXT_PORT_STRIDE;
+ dwapb_write(gpio, offset, ctx->ext);
+
+ /* Only port A can provide interrupts */
+ if (idx == 0) {
+ dwapb_write(gpio, GPIO_INTTYPE_LEVEL, ctx->int_type);
+ dwapb_write(gpio, GPIO_INT_POLARITY, ctx->int_pol);
+ dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, ctx->int_deb);
+ dwapb_write(gpio, GPIO_INTEN, ctx->int_en);
+ dwapb_write(gpio, GPIO_INTMASK, ctx->int_mask);
+
+ /* Clear out spurious interrupts */
+ dwapb_write(gpio, GPIO_PORTA_EOI, 0xffffffff);
+ }
+ }
+ raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(dwapb_gpio_pm_ops, dwapb_gpio_suspend,
+ dwapb_gpio_resume);
+
+static struct platform_driver dwapb_gpio_driver = {
+ .driver = {
+ .name = DWAPB_DRIVER_NAME,
+ .pm = &dwapb_gpio_pm_ops,
+ .of_match_table = dwapb_of_match,
+ .acpi_match_table = dwapb_acpi_match,
+ },
+ .probe = dwapb_gpio_probe,
+};
+
+module_platform_driver(dwapb_gpio_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jamie Iles");
+MODULE_DESCRIPTION("Synopsys DesignWare APB GPIO driver");
+MODULE_ALIAS("platform:" DWAPB_DRIVER_NAME);