v4.19.13 snapshot.
diff --git a/drivers/bcma/driver_gpio.c b/drivers/bcma/driver_gpio.c
new file mode 100644
index 0000000..2c0ffb7
--- /dev/null
+++ b/drivers/bcma/driver_gpio.c
@@ -0,0 +1,233 @@
+/*
+ * Broadcom specific AMBA
+ * GPIO driver
+ *
+ * Copyright 2011, Broadcom Corporation
+ * Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de>
+ *
+ * Licensed under the GNU/GPL. See COPYING for details.
+ */
+
+#include <linux/gpio/driver.h>
+#include <linux/interrupt.h>
+#include <linux/export.h>
+#include <linux/bcma/bcma.h>
+
+#include "bcma_private.h"
+
+#define BCMA_GPIO_MAX_PINS 32
+
+static int bcma_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
+{
+ struct bcma_drv_cc *cc = gpiochip_get_data(chip);
+
+ return !!bcma_chipco_gpio_in(cc, 1 << gpio);
+}
+
+static void bcma_gpio_set_value(struct gpio_chip *chip, unsigned gpio,
+ int value)
+{
+ struct bcma_drv_cc *cc = gpiochip_get_data(chip);
+
+ bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0);
+}
+
+static int bcma_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
+{
+ struct bcma_drv_cc *cc = gpiochip_get_data(chip);
+
+ bcma_chipco_gpio_outen(cc, 1 << gpio, 0);
+ return 0;
+}
+
+static int bcma_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
+ int value)
+{
+ struct bcma_drv_cc *cc = gpiochip_get_data(chip);
+
+ bcma_chipco_gpio_outen(cc, 1 << gpio, 1 << gpio);
+ bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0);
+ return 0;
+}
+
+static int bcma_gpio_request(struct gpio_chip *chip, unsigned gpio)
+{
+ struct bcma_drv_cc *cc = gpiochip_get_data(chip);
+
+ bcma_chipco_gpio_control(cc, 1 << gpio, 0);
+ /* clear pulldown */
+ bcma_chipco_gpio_pulldown(cc, 1 << gpio, 0);
+ /* Set pullup */
+ bcma_chipco_gpio_pullup(cc, 1 << gpio, 1 << gpio);
+
+ return 0;
+}
+
+static void bcma_gpio_free(struct gpio_chip *chip, unsigned gpio)
+{
+ struct bcma_drv_cc *cc = gpiochip_get_data(chip);
+
+ /* clear pullup */
+ bcma_chipco_gpio_pullup(cc, 1 << gpio, 0);
+}
+
+#if IS_BUILTIN(CONFIG_BCM47XX) || IS_BUILTIN(CONFIG_ARCH_BCM_5301X)
+
+static void bcma_gpio_irq_unmask(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct bcma_drv_cc *cc = gpiochip_get_data(gc);
+ int gpio = irqd_to_hwirq(d);
+ u32 val = bcma_chipco_gpio_in(cc, BIT(gpio));
+
+ bcma_chipco_gpio_polarity(cc, BIT(gpio), val);
+ bcma_chipco_gpio_intmask(cc, BIT(gpio), BIT(gpio));
+}
+
+static void bcma_gpio_irq_mask(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct bcma_drv_cc *cc = gpiochip_get_data(gc);
+ int gpio = irqd_to_hwirq(d);
+
+ bcma_chipco_gpio_intmask(cc, BIT(gpio), 0);
+}
+
+static struct irq_chip bcma_gpio_irq_chip = {
+ .name = "BCMA-GPIO",
+ .irq_mask = bcma_gpio_irq_mask,
+ .irq_unmask = bcma_gpio_irq_unmask,
+};
+
+static irqreturn_t bcma_gpio_irq_handler(int irq, void *dev_id)
+{
+ struct bcma_drv_cc *cc = dev_id;
+ struct gpio_chip *gc = &cc->gpio;
+ u32 val = bcma_cc_read32(cc, BCMA_CC_GPIOIN);
+ u32 mask = bcma_cc_read32(cc, BCMA_CC_GPIOIRQ);
+ u32 pol = bcma_cc_read32(cc, BCMA_CC_GPIOPOL);
+ unsigned long irqs = (val ^ pol) & mask;
+ int gpio;
+
+ if (!irqs)
+ return IRQ_NONE;
+
+ for_each_set_bit(gpio, &irqs, gc->ngpio)
+ generic_handle_irq(irq_find_mapping(gc->irq.domain, gpio));
+ bcma_chipco_gpio_polarity(cc, irqs, val & irqs);
+
+ return IRQ_HANDLED;
+}
+
+static int bcma_gpio_irq_init(struct bcma_drv_cc *cc)
+{
+ struct gpio_chip *chip = &cc->gpio;
+ int hwirq, err;
+
+ if (cc->core->bus->hosttype != BCMA_HOSTTYPE_SOC)
+ return 0;
+
+ hwirq = bcma_core_irq(cc->core, 0);
+ err = request_irq(hwirq, bcma_gpio_irq_handler, IRQF_SHARED, "gpio",
+ cc);
+ if (err)
+ return err;
+
+ bcma_chipco_gpio_intmask(cc, ~0, 0);
+ bcma_cc_set32(cc, BCMA_CC_IRQMASK, BCMA_CC_IRQ_GPIO);
+
+ err = gpiochip_irqchip_add(chip,
+ &bcma_gpio_irq_chip,
+ 0,
+ handle_simple_irq,
+ IRQ_TYPE_NONE);
+ if (err) {
+ free_irq(hwirq, cc);
+ return err;
+ }
+
+ return 0;
+}
+
+static void bcma_gpio_irq_exit(struct bcma_drv_cc *cc)
+{
+ if (cc->core->bus->hosttype != BCMA_HOSTTYPE_SOC)
+ return;
+
+ bcma_cc_mask32(cc, BCMA_CC_IRQMASK, ~BCMA_CC_IRQ_GPIO);
+ free_irq(bcma_core_irq(cc->core, 0), cc);
+}
+#else
+static int bcma_gpio_irq_init(struct bcma_drv_cc *cc)
+{
+ return 0;
+}
+
+static void bcma_gpio_irq_exit(struct bcma_drv_cc *cc)
+{
+}
+#endif
+
+int bcma_gpio_init(struct bcma_drv_cc *cc)
+{
+ struct bcma_bus *bus = cc->core->bus;
+ struct gpio_chip *chip = &cc->gpio;
+ int err;
+
+ chip->label = "bcma_gpio";
+ chip->owner = THIS_MODULE;
+ chip->request = bcma_gpio_request;
+ chip->free = bcma_gpio_free;
+ chip->get = bcma_gpio_get_value;
+ chip->set = bcma_gpio_set_value;
+ chip->direction_input = bcma_gpio_direction_input;
+ chip->direction_output = bcma_gpio_direction_output;
+ chip->owner = THIS_MODULE;
+ chip->parent = bcma_bus_get_host_dev(bus);
+#if IS_BUILTIN(CONFIG_OF)
+ chip->of_node = cc->core->dev.of_node;
+#endif
+ switch (bus->chipinfo.id) {
+ case BCMA_CHIP_ID_BCM4707:
+ case BCMA_CHIP_ID_BCM5357:
+ case BCMA_CHIP_ID_BCM53572:
+ case BCMA_CHIP_ID_BCM53573:
+ case BCMA_CHIP_ID_BCM47094:
+ chip->ngpio = 32;
+ break;
+ default:
+ chip->ngpio = 16;
+ }
+
+ /*
+ * Register SoC GPIO devices with absolute GPIO pin base.
+ * On MIPS, we don't have Device Tree and we can't use relative (per chip)
+ * GPIO numbers.
+ * On some ARM devices, user space may want to access some system GPIO
+ * pins directly, which is easier to do with a predictable GPIO base.
+ */
+ if (IS_BUILTIN(CONFIG_BCM47XX) ||
+ cc->core->bus->hosttype == BCMA_HOSTTYPE_SOC)
+ chip->base = bus->num * BCMA_GPIO_MAX_PINS;
+ else
+ chip->base = -1;
+
+ err = gpiochip_add_data(chip, cc);
+ if (err)
+ return err;
+
+ err = bcma_gpio_irq_init(cc);
+ if (err) {
+ gpiochip_remove(chip);
+ return err;
+ }
+
+ return 0;
+}
+
+int bcma_gpio_unregister(struct bcma_drv_cc *cc)
+{
+ bcma_gpio_irq_exit(cc);
+ gpiochip_remove(&cc->gpio);
+ return 0;
+}