--- /dev/null
+/*
+ * 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.
+ *
+ * Copyright (C) 2011 Thomas Langer <thomas.langer@lantiq.com>
+ * Copyright (C) 2011 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+
+#include <lantiq_soc.h>
+
+/* Multiplexer Control Register */
+#define LTQ_PADC_MUX(x) (x * 0x4)
+/* Pad Control Availability Register */
+#define LTQ_PADC_AVAIL 0x000000F0
+
+/* Data Output Register */
+#define LTQ_GPIO_OUT 0x00000000
+/* Data Input Register */
+#define LTQ_GPIO_IN 0x00000004
+/* Direction Register */
+#define LTQ_GPIO_DIR 0x00000008
+/* External Interrupt Control Register 0 */
+#define LTQ_GPIO_EXINTCR0 0x00000018
+/* External Interrupt Control Register 1 */
+#define LTQ_GPIO_EXINTCR1 0x0000001C
+/* IRN Capture Register */
+#define LTQ_GPIO_IRNCR 0x00000020
+/* IRN Interrupt Configuration Register */
+#define LTQ_GPIO_IRNCFG 0x0000002C
+/* IRN Interrupt Enable Set Register */
+#define LTQ_GPIO_IRNRNSET 0x00000030
+/* IRN Interrupt Enable Clear Register */
+#define LTQ_GPIO_IRNENCLR 0x00000034
+/* Output Set Register */
+#define LTQ_GPIO_OUTSET 0x00000040
+/* Output Cler Register */
+#define LTQ_GPIO_OUTCLR 0x00000044
+/* Direction Clear Register */
+#define LTQ_GPIO_DIRSET 0x00000048
+/* Direction Set Register */
+#define LTQ_GPIO_DIRCLR 0x0000004C
+
+/* turn a gpio_chip into a falcon_gpio_port */
+#define ctop(c) container_of(c, struct falcon_gpio_port, gpio_chip)
+/* turn a irq_data into a falcon_gpio_port */
+#define itop(i) ((struct falcon_gpio_port *) irq_get_chip_data(i->irq))
+
+#define ltq_pad_r32(p, reg) ltq_r32(p->pad + reg)
+#define ltq_pad_w32(p, val, reg) ltq_w32(val, p->pad + reg)
+#define ltq_pad_w32_mask(c, clear, set, reg) \
+ ltq_pad_w32(c, (ltq_pad_r32(c, reg) & ~(clear)) | (set), reg)
+
+#define ltq_port_r32(p, reg) ltq_r32(p->port + reg)
+#define ltq_port_w32(p, val, reg) ltq_w32(val, p->port + reg)
+#define ltq_port_w32_mask(p, clear, set, reg) \
+ ltq_port_w32(p, (ltq_port_r32(p, reg) & ~(clear)) | (set), reg)
+
+#define MAX_PORTS 5
+#define PINS_PER_PORT 32
+
+struct falcon_gpio_port {
+ struct gpio_chip gpio_chip;
+ void __iomem *pad;
+ void __iomem *port;
+ unsigned int irq_base;
+ unsigned int chained_irq;
+ struct clk *clk;
+};
+
+static struct falcon_gpio_port ltq_gpio_port[MAX_PORTS];
+
+int gpio_to_irq(unsigned int gpio)
+{
+ return __gpio_to_irq(gpio);
+}
+EXPORT_SYMBOL(gpio_to_irq);
+
+int ltq_gpio_mux_set(unsigned int pin, unsigned int mux)
+{
+ int port = pin / 100;
+ int offset = pin % 100;
+ struct falcon_gpio_port *gpio_port;
+
+ if ((offset >= PINS_PER_PORT) || (port >= MAX_PORTS))
+ return -EINVAL;
+
+ gpio_port = <q_gpio_port[port];
+ ltq_pad_w32(gpio_port, mux & 0x3, LTQ_PADC_MUX(offset));
+
+ return 0;
+}
+EXPORT_SYMBOL(ltq_gpio_mux_set);
+
+int ltq_gpio_request(struct device *dev, unsigned int pin, unsigned int mux,
+ unsigned int dir, const char *name)
+{
+ int port = pin / 100;
+ int offset = pin % 100;
+
+ if (offset >= PINS_PER_PORT || port >= MAX_PORTS)
+ return -EINVAL;
+
+ if (devm_gpio_request(dev, pin, name)) {
+ pr_err("failed to setup lantiq gpio: %s\n", name);
+ return -EBUSY;
+ }
+
+ if (dir)
+ gpio_direction_output(pin, 1);
+ else
+ gpio_direction_input(pin);
+
+ return ltq_gpio_mux_set(pin, mux);
+}
+EXPORT_SYMBOL(ltq_gpio_request);
+
+static int
+falcon_gpio_direction_input(struct gpio_chip *chip, unsigned int offset)
+{
+ ltq_port_w32(ctop(chip), 1 << offset, LTQ_GPIO_DIRCLR);
+
+ return 0;
+}
+
+static void
+falcon_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
+{
+ if (value)
+ ltq_port_w32(ctop(chip), 1 << offset, LTQ_GPIO_OUTSET);
+ else
+ ltq_port_w32(ctop(chip), 1 << offset, LTQ_GPIO_OUTCLR);
+}
+
+static int
+falcon_gpio_direction_output(struct gpio_chip *chip,
+ unsigned int offset, int value)
+{
+ falcon_gpio_set(chip, offset, value);
+ ltq_port_w32(ctop(chip), 1 << offset, LTQ_GPIO_DIRSET);
+
+ return 0;
+}
+
+static int
+falcon_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ if ((ltq_port_r32(ctop(chip), LTQ_GPIO_DIR) >> offset) & 1)
+ return (ltq_port_r32(ctop(chip), LTQ_GPIO_OUT) >> offset) & 1;
+ else
+ return (ltq_port_r32(ctop(chip), LTQ_GPIO_IN) >> offset) & 1;
+}
+
+static int
+falcon_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+ if ((ltq_pad_r32(ctop(chip), LTQ_PADC_AVAIL) >> offset) & 1) {
+ if (ltq_pad_r32(ctop(chip), LTQ_PADC_MUX(offset)) > 1)
+ return -EBUSY;
+ /* switch on gpio function */
+ ltq_pad_w32(ctop(chip), 1, LTQ_PADC_MUX(offset));
+ return 0;
+ }
+
+ return -ENODEV;
+}
+
+static void
+falcon_gpio_free(struct gpio_chip *chip, unsigned offset)
+{
+ if ((ltq_pad_r32(ctop(chip), LTQ_PADC_AVAIL) >> offset) & 1) {
+ if (ltq_pad_r32(ctop(chip), LTQ_PADC_MUX(offset)) > 1)
+ return;
+ /* switch off gpio function */
+ ltq_pad_w32(ctop(chip), 0, LTQ_PADC_MUX(offset));
+ }
+}
+
+static int
+falcon_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+ return ctop(chip)->irq_base + offset;
+}
+
+static void
+falcon_gpio_disable_irq(struct irq_data *d)
+{
+ unsigned int offset = d->irq - itop(d)->irq_base;
+
+ ltq_port_w32(itop(d), 1 << offset, LTQ_GPIO_IRNENCLR);
+}
+
+static void
+falcon_gpio_enable_irq(struct irq_data *d)
+{
+ unsigned int offset = d->irq - itop(d)->irq_base;
+
+ if (!ltq_pad_r32(itop(d), LTQ_PADC_MUX(offset)) < 1)
+ /* switch on gpio function */
+ ltq_pad_w32(itop(d), 1, LTQ_PADC_MUX(offset));
+
+ ltq_port_w32(itop(d), 1 << offset, LTQ_GPIO_IRNRNSET);
+}
+
+static void
+falcon_gpio_ack_irq(struct irq_data *d)
+{
+ unsigned int offset = d->irq - itop(d)->irq_base;
+
+ ltq_port_w32(itop(d), 1 << offset, LTQ_GPIO_IRNCR);
+}
+
+static void
+falcon_gpio_mask_and_ack_irq(struct irq_data *d)
+{
+ unsigned int offset = d->irq - itop(d)->irq_base;
+
+ ltq_port_w32(itop(d), 1 << offset, LTQ_GPIO_IRNENCLR);
+ ltq_port_w32(itop(d), 1 << offset, LTQ_GPIO_IRNCR);
+}
+
+static struct irq_chip falcon_gpio_irq_chip;
+static int
+falcon_gpio_irq_type(struct irq_data *d, unsigned int type)
+{
+ unsigned int offset = d->irq - itop(d)->irq_base;
+ unsigned int mask = 1 << offset;
+
+ if ((type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_NONE)
+ return 0;
+
+ if ((type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) != 0) {
+ /* level triggered */
+ ltq_port_w32_mask(itop(d), 0, mask, LTQ_GPIO_IRNCFG);
+ irq_set_chip_and_handler_name(d->irq,
+ &falcon_gpio_irq_chip, handle_level_irq, "mux");
+ } else {
+ /* edge triggered */
+ ltq_port_w32_mask(itop(d), mask, 0, LTQ_GPIO_IRNCFG);
+ irq_set_chip_and_handler_name(d->irq,
+ &falcon_gpio_irq_chip, handle_simple_irq, "mux");
+ }
+
+ if ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) {
+ ltq_port_w32_mask(itop(d), mask, 0, LTQ_GPIO_EXINTCR0);
+ ltq_port_w32_mask(itop(d), 0, mask, LTQ_GPIO_EXINTCR1);
+ } else {
+ if ((type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_LEVEL_HIGH)) != 0)
+ /* positive logic: rising edge, high level */
+ ltq_port_w32_mask(itop(d), mask, 0, LTQ_GPIO_EXINTCR0);
+ else
+ /* negative logic: falling edge, low level */
+ ltq_port_w32_mask(itop(d), 0, mask, LTQ_GPIO_EXINTCR0);
+ ltq_port_w32_mask(itop(d), mask, 0, LTQ_GPIO_EXINTCR1);
+ }
+
+ return gpio_direction_input(itop(d)->gpio_chip.base + offset);
+}
+
+static void
+falcon_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+ struct falcon_gpio_port *gpio_port = irq_desc_get_handler_data(desc);
+ unsigned long irncr;
+ int offset;
+
+ /* acknowledge interrupt */
+ irncr = ltq_port_r32(gpio_port, LTQ_GPIO_IRNCR);
+ ltq_port_w32(gpio_port, irncr, LTQ_GPIO_IRNCR);
+
+ desc->irq_data.chip->irq_ack(&desc->irq_data);
+
+ for_each_set_bit(offset, &irncr, gpio_port->gpio_chip.ngpio)
+ generic_handle_irq(gpio_port->irq_base + offset);
+}
+
+static struct irq_chip falcon_gpio_irq_chip = {
+ .name = "gpio_irq_mux",
+ .irq_mask = falcon_gpio_disable_irq,
+ .irq_unmask = falcon_gpio_enable_irq,
+ .irq_ack = falcon_gpio_ack_irq,
+ .irq_mask_ack = falcon_gpio_mask_and_ack_irq,
+ .irq_set_type = falcon_gpio_irq_type,
+};
+
+static struct irqaction gpio_cascade = {
+ .handler = no_action,
+ .flags = IRQF_DISABLED,
+ .name = "gpio_cascade",
+};
+
+static int
+falcon_gpio_probe(struct platform_device *pdev)
+{
+ struct falcon_gpio_port *gpio_port;
+ int ret, i;
+ struct resource *gpiores, *padres;
+ int irq;
+
+ if (pdev->id >= MAX_PORTS)
+ return -ENODEV;
+
+ gpiores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ padres = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ irq = platform_get_irq(pdev, 0);
+ if (!gpiores || !padres)
+ return -ENODEV;
+
+ gpio_port = <q_gpio_port[pdev->id];
+ gpio_port->gpio_chip.label = "falcon-gpio";
+ gpio_port->gpio_chip.direction_input = falcon_gpio_direction_input;
+ gpio_port->gpio_chip.direction_output = falcon_gpio_direction_output;
+ gpio_port->gpio_chip.get = falcon_gpio_get;
+ gpio_port->gpio_chip.set = falcon_gpio_set;
+ gpio_port->gpio_chip.request = falcon_gpio_request;
+ gpio_port->gpio_chip.free = falcon_gpio_free;
+ gpio_port->gpio_chip.base = 100 * pdev->id;
+ gpio_port->gpio_chip.ngpio = 32;
+ gpio_port->gpio_chip.dev = &pdev->dev;
+
+ gpio_port->port = ltq_remap_resource(gpiores);
+ gpio_port->pad = ltq_remap_resource(padres);
+
+ if (!gpio_port->port || !gpio_port->pad) {
+ dev_err(&pdev->dev, "Could not map io ranges\n");
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ gpio_port->clk = clk_get(&pdev->dev, NULL);
+ if (IS_ERR(gpio_port->clk)) {
+ dev_err(&pdev->dev, "Could not get clock\n");
+ ret = PTR_ERR(gpio_port->clk);;
+ goto err;
+ }
+ clk_enable(gpio_port->clk);
+
+ if (irq > 0) {
+ /* irq_chip support */
+ gpio_port->gpio_chip.to_irq = falcon_gpio_to_irq;
+ gpio_port->irq_base = INT_NUM_EXTRA_START + (32 * pdev->id);
+
+ for (i = 0; i < 32; i++) {
+ irq_set_chip_and_handler_name(gpio_port->irq_base + i,
+ &falcon_gpio_irq_chip, handle_simple_irq,
+ "mux");
+ irq_set_chip_data(gpio_port->irq_base + i, gpio_port);
+ /* set to negative logic (falling edge, low level) */
+ ltq_port_w32_mask(gpio_port, 0, 1 << i,
+ LTQ_GPIO_EXINTCR0);
+ }
+
+ gpio_port->chained_irq = irq;
+ setup_irq(irq, &gpio_cascade);
+ irq_set_handler_data(irq, gpio_port);
+ irq_set_chained_handler(irq, falcon_gpio_irq_handler);
+ }
+
+ ret = gpiochip_add(&gpio_port->gpio_chip);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Could not register gpiochip %d, %d\n",
+ pdev->id, ret);
+ goto err;
+ }
+ platform_set_drvdata(pdev, gpio_port);
+ return ret;
+
+err:
+ dev_err(&pdev->dev, "Error in gpio_probe %d, %d\n", pdev->id, ret);
+ if (gpiores)
+ release_resource(gpiores);
+ if (padres)
+ release_resource(padres);
+
+ if (gpio_port->port)
+ iounmap(gpio_port->port);
+ if (gpio_port->pad)
+ iounmap(gpio_port->pad);
+ return ret;
+}
+
+static struct platform_driver falcon_gpio_driver = {
+ .probe = falcon_gpio_probe,
+ .driver = {
+ .name = "falcon_gpio",
+ .owner = THIS_MODULE,
+ },
+};
+
+int __init
+falcon_gpio_init(void)
+{
+ int ret;
+
+ pr_info("FALC(tm) ON GPIO Driver, (C) 2011 Lantiq Deutschland Gmbh\n");
+ ret = platform_driver_register(&falcon_gpio_driver);
+ if (ret)
+ pr_err("falcon_gpio: Error registering platform driver!");
+ return ret;
+}
+
+postcore_initcall(falcon_gpio_init);
projects / openwrt.git / blobdiff