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path: root/drivers/gpio/gpio-104-dio-48e.c
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-rw-r--r--drivers/gpio/gpio-104-dio-48e.c463
1 files changed, 463 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-104-dio-48e.c b/drivers/gpio/gpio-104-dio-48e.c
new file mode 100644
index 000000000..7a9021c4f
--- /dev/null
+++ b/drivers/gpio/gpio-104-dio-48e.c
@@ -0,0 +1,463 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * GPIO driver for the ACCES 104-DIO-48E series
+ * Copyright (C) 2016 William Breathitt Gray
+ *
+ * This driver supports the following ACCES devices: 104-DIO-48E and
+ * 104-DIO-24E.
+ */
+#include <linux/bitmap.h>
+#include <linux/bitops.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/gpio/driver.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/irqdesc.h>
+#include <linux/isa.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/spinlock.h>
+
+#define DIO48E_EXTENT 16
+#define MAX_NUM_DIO48E max_num_isa_dev(DIO48E_EXTENT)
+
+static unsigned int base[MAX_NUM_DIO48E];
+static unsigned int num_dio48e;
+module_param_hw_array(base, uint, ioport, &num_dio48e, 0);
+MODULE_PARM_DESC(base, "ACCES 104-DIO-48E base addresses");
+
+static unsigned int irq[MAX_NUM_DIO48E];
+module_param_hw_array(irq, uint, irq, NULL, 0);
+MODULE_PARM_DESC(irq, "ACCES 104-DIO-48E interrupt line numbers");
+
+/**
+ * struct dio48e_gpio - GPIO device private data structure
+ * @chip: instance of the gpio_chip
+ * @io_state: bit I/O state (whether bit is set to input or output)
+ * @out_state: output bits state
+ * @control: Control registers state
+ * @lock: synchronization lock to prevent I/O race conditions
+ * @base: base port address of the GPIO device
+ * @irq_mask: I/O bits affected by interrupts
+ */
+struct dio48e_gpio {
+ struct gpio_chip chip;
+ unsigned char io_state[6];
+ unsigned char out_state[6];
+ unsigned char control[2];
+ raw_spinlock_t lock;
+ unsigned base;
+ unsigned char irq_mask;
+};
+
+static int dio48e_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
+{
+ struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
+ const unsigned port = offset / 8;
+ const unsigned mask = BIT(offset % 8);
+
+ if (dio48egpio->io_state[port] & mask)
+ return GPIO_LINE_DIRECTION_IN;
+
+ return GPIO_LINE_DIRECTION_OUT;
+}
+
+static int dio48e_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+ struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
+ const unsigned io_port = offset / 8;
+ const unsigned int control_port = io_port / 3;
+ const unsigned control_addr = dio48egpio->base + 3 + control_port*4;
+ unsigned long flags;
+ unsigned control;
+
+ raw_spin_lock_irqsave(&dio48egpio->lock, flags);
+
+ /* Check if configuring Port C */
+ if (io_port == 2 || io_port == 5) {
+ /* Port C can be configured by nibble */
+ if (offset % 8 > 3) {
+ dio48egpio->io_state[io_port] |= 0xF0;
+ dio48egpio->control[control_port] |= BIT(3);
+ } else {
+ dio48egpio->io_state[io_port] |= 0x0F;
+ dio48egpio->control[control_port] |= BIT(0);
+ }
+ } else {
+ dio48egpio->io_state[io_port] |= 0xFF;
+ if (io_port == 0 || io_port == 3)
+ dio48egpio->control[control_port] |= BIT(4);
+ else
+ dio48egpio->control[control_port] |= BIT(1);
+ }
+
+ control = BIT(7) | dio48egpio->control[control_port];
+ outb(control, control_addr);
+ control &= ~BIT(7);
+ outb(control, control_addr);
+
+ raw_spin_unlock_irqrestore(&dio48egpio->lock, flags);
+
+ return 0;
+}
+
+static int dio48e_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
+ int value)
+{
+ struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
+ const unsigned io_port = offset / 8;
+ const unsigned int control_port = io_port / 3;
+ const unsigned mask = BIT(offset % 8);
+ const unsigned control_addr = dio48egpio->base + 3 + control_port*4;
+ const unsigned out_port = (io_port > 2) ? io_port + 1 : io_port;
+ unsigned long flags;
+ unsigned control;
+
+ raw_spin_lock_irqsave(&dio48egpio->lock, flags);
+
+ /* Check if configuring Port C */
+ if (io_port == 2 || io_port == 5) {
+ /* Port C can be configured by nibble */
+ if (offset % 8 > 3) {
+ dio48egpio->io_state[io_port] &= 0x0F;
+ dio48egpio->control[control_port] &= ~BIT(3);
+ } else {
+ dio48egpio->io_state[io_port] &= 0xF0;
+ dio48egpio->control[control_port] &= ~BIT(0);
+ }
+ } else {
+ dio48egpio->io_state[io_port] &= 0x00;
+ if (io_port == 0 || io_port == 3)
+ dio48egpio->control[control_port] &= ~BIT(4);
+ else
+ dio48egpio->control[control_port] &= ~BIT(1);
+ }
+
+ if (value)
+ dio48egpio->out_state[io_port] |= mask;
+ else
+ dio48egpio->out_state[io_port] &= ~mask;
+
+ control = BIT(7) | dio48egpio->control[control_port];
+ outb(control, control_addr);
+
+ outb(dio48egpio->out_state[io_port], dio48egpio->base + out_port);
+
+ control &= ~BIT(7);
+ outb(control, control_addr);
+
+ raw_spin_unlock_irqrestore(&dio48egpio->lock, flags);
+
+ return 0;
+}
+
+static int dio48e_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
+ const unsigned port = offset / 8;
+ const unsigned mask = BIT(offset % 8);
+ const unsigned in_port = (port > 2) ? port + 1 : port;
+ unsigned long flags;
+ unsigned port_state;
+
+ raw_spin_lock_irqsave(&dio48egpio->lock, flags);
+
+ /* ensure that GPIO is set for input */
+ if (!(dio48egpio->io_state[port] & mask)) {
+ raw_spin_unlock_irqrestore(&dio48egpio->lock, flags);
+ return -EINVAL;
+ }
+
+ port_state = inb(dio48egpio->base + in_port);
+
+ raw_spin_unlock_irqrestore(&dio48egpio->lock, flags);
+
+ return !!(port_state & mask);
+}
+
+static const size_t ports[] = { 0, 1, 2, 4, 5, 6 };
+
+static int dio48e_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
+ unsigned long *bits)
+{
+ struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
+ unsigned long offset;
+ unsigned long gpio_mask;
+ unsigned int port_addr;
+ unsigned long port_state;
+
+ /* clear bits array to a clean slate */
+ bitmap_zero(bits, chip->ngpio);
+
+ for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) {
+ port_addr = dio48egpio->base + ports[offset / 8];
+ port_state = inb(port_addr) & gpio_mask;
+
+ bitmap_set_value8(bits, port_state, offset);
+ }
+
+ return 0;
+}
+
+static void dio48e_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
+ const unsigned port = offset / 8;
+ const unsigned mask = BIT(offset % 8);
+ const unsigned out_port = (port > 2) ? port + 1 : port;
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&dio48egpio->lock, flags);
+
+ if (value)
+ dio48egpio->out_state[port] |= mask;
+ else
+ dio48egpio->out_state[port] &= ~mask;
+
+ outb(dio48egpio->out_state[port], dio48egpio->base + out_port);
+
+ raw_spin_unlock_irqrestore(&dio48egpio->lock, flags);
+}
+
+static void dio48e_gpio_set_multiple(struct gpio_chip *chip,
+ unsigned long *mask, unsigned long *bits)
+{
+ struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
+ unsigned long offset;
+ unsigned long gpio_mask;
+ size_t index;
+ unsigned int port_addr;
+ unsigned long bitmask;
+ unsigned long flags;
+
+ for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) {
+ index = offset / 8;
+ port_addr = dio48egpio->base + ports[index];
+
+ bitmask = bitmap_get_value8(bits, offset) & gpio_mask;
+
+ raw_spin_lock_irqsave(&dio48egpio->lock, flags);
+
+ /* update output state data and set device gpio register */
+ dio48egpio->out_state[index] &= ~gpio_mask;
+ dio48egpio->out_state[index] |= bitmask;
+ outb(dio48egpio->out_state[index], port_addr);
+
+ raw_spin_unlock_irqrestore(&dio48egpio->lock, flags);
+ }
+}
+
+static void dio48e_irq_ack(struct irq_data *data)
+{
+}
+
+static void dio48e_irq_mask(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
+ const unsigned long offset = irqd_to_hwirq(data);
+ unsigned long flags;
+
+ /* only bit 3 on each respective Port C supports interrupts */
+ if (offset != 19 && offset != 43)
+ return;
+
+ raw_spin_lock_irqsave(&dio48egpio->lock, flags);
+
+ if (offset == 19)
+ dio48egpio->irq_mask &= ~BIT(0);
+ else
+ dio48egpio->irq_mask &= ~BIT(1);
+
+ if (!dio48egpio->irq_mask)
+ /* disable interrupts */
+ inb(dio48egpio->base + 0xB);
+
+ raw_spin_unlock_irqrestore(&dio48egpio->lock, flags);
+}
+
+static void dio48e_irq_unmask(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
+ const unsigned long offset = irqd_to_hwirq(data);
+ unsigned long flags;
+
+ /* only bit 3 on each respective Port C supports interrupts */
+ if (offset != 19 && offset != 43)
+ return;
+
+ raw_spin_lock_irqsave(&dio48egpio->lock, flags);
+
+ if (!dio48egpio->irq_mask) {
+ /* enable interrupts */
+ outb(0x00, dio48egpio->base + 0xF);
+ outb(0x00, dio48egpio->base + 0xB);
+ }
+
+ if (offset == 19)
+ dio48egpio->irq_mask |= BIT(0);
+ else
+ dio48egpio->irq_mask |= BIT(1);
+
+ raw_spin_unlock_irqrestore(&dio48egpio->lock, flags);
+}
+
+static int dio48e_irq_set_type(struct irq_data *data, unsigned flow_type)
+{
+ const unsigned long offset = irqd_to_hwirq(data);
+
+ /* only bit 3 on each respective Port C supports interrupts */
+ if (offset != 19 && offset != 43)
+ return -EINVAL;
+
+ if (flow_type != IRQ_TYPE_NONE && flow_type != IRQ_TYPE_EDGE_RISING)
+ return -EINVAL;
+
+ return 0;
+}
+
+static struct irq_chip dio48e_irqchip = {
+ .name = "104-dio-48e",
+ .irq_ack = dio48e_irq_ack,
+ .irq_mask = dio48e_irq_mask,
+ .irq_unmask = dio48e_irq_unmask,
+ .irq_set_type = dio48e_irq_set_type
+};
+
+static irqreturn_t dio48e_irq_handler(int irq, void *dev_id)
+{
+ struct dio48e_gpio *const dio48egpio = dev_id;
+ struct gpio_chip *const chip = &dio48egpio->chip;
+ const unsigned long irq_mask = dio48egpio->irq_mask;
+ unsigned long gpio;
+
+ for_each_set_bit(gpio, &irq_mask, 2)
+ generic_handle_irq(irq_find_mapping(chip->irq.domain,
+ 19 + gpio*24));
+
+ raw_spin_lock(&dio48egpio->lock);
+
+ outb(0x00, dio48egpio->base + 0xF);
+
+ raw_spin_unlock(&dio48egpio->lock);
+
+ return IRQ_HANDLED;
+}
+
+#define DIO48E_NGPIO 48
+static const char *dio48e_names[DIO48E_NGPIO] = {
+ "PPI Group 0 Port A 0", "PPI Group 0 Port A 1", "PPI Group 0 Port A 2",
+ "PPI Group 0 Port A 3", "PPI Group 0 Port A 4", "PPI Group 0 Port A 5",
+ "PPI Group 0 Port A 6", "PPI Group 0 Port A 7", "PPI Group 0 Port B 0",
+ "PPI Group 0 Port B 1", "PPI Group 0 Port B 2", "PPI Group 0 Port B 3",
+ "PPI Group 0 Port B 4", "PPI Group 0 Port B 5", "PPI Group 0 Port B 6",
+ "PPI Group 0 Port B 7", "PPI Group 0 Port C 0", "PPI Group 0 Port C 1",
+ "PPI Group 0 Port C 2", "PPI Group 0 Port C 3", "PPI Group 0 Port C 4",
+ "PPI Group 0 Port C 5", "PPI Group 0 Port C 6", "PPI Group 0 Port C 7",
+ "PPI Group 1 Port A 0", "PPI Group 1 Port A 1", "PPI Group 1 Port A 2",
+ "PPI Group 1 Port A 3", "PPI Group 1 Port A 4", "PPI Group 1 Port A 5",
+ "PPI Group 1 Port A 6", "PPI Group 1 Port A 7", "PPI Group 1 Port B 0",
+ "PPI Group 1 Port B 1", "PPI Group 1 Port B 2", "PPI Group 1 Port B 3",
+ "PPI Group 1 Port B 4", "PPI Group 1 Port B 5", "PPI Group 1 Port B 6",
+ "PPI Group 1 Port B 7", "PPI Group 1 Port C 0", "PPI Group 1 Port C 1",
+ "PPI Group 1 Port C 2", "PPI Group 1 Port C 3", "PPI Group 1 Port C 4",
+ "PPI Group 1 Port C 5", "PPI Group 1 Port C 6", "PPI Group 1 Port C 7"
+};
+
+static int dio48e_irq_init_hw(struct gpio_chip *gc)
+{
+ struct dio48e_gpio *const dio48egpio = gpiochip_get_data(gc);
+
+ /* Disable IRQ by default */
+ inb(dio48egpio->base + 0xB);
+
+ return 0;
+}
+
+static int dio48e_probe(struct device *dev, unsigned int id)
+{
+ struct dio48e_gpio *dio48egpio;
+ const char *const name = dev_name(dev);
+ struct gpio_irq_chip *girq;
+ int err;
+
+ dio48egpio = devm_kzalloc(dev, sizeof(*dio48egpio), GFP_KERNEL);
+ if (!dio48egpio)
+ return -ENOMEM;
+
+ if (!devm_request_region(dev, base[id], DIO48E_EXTENT, name)) {
+ dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
+ base[id], base[id] + DIO48E_EXTENT);
+ return -EBUSY;
+ }
+
+ dio48egpio->chip.label = name;
+ dio48egpio->chip.parent = dev;
+ dio48egpio->chip.owner = THIS_MODULE;
+ dio48egpio->chip.base = -1;
+ dio48egpio->chip.ngpio = DIO48E_NGPIO;
+ dio48egpio->chip.names = dio48e_names;
+ dio48egpio->chip.get_direction = dio48e_gpio_get_direction;
+ dio48egpio->chip.direction_input = dio48e_gpio_direction_input;
+ dio48egpio->chip.direction_output = dio48e_gpio_direction_output;
+ dio48egpio->chip.get = dio48e_gpio_get;
+ dio48egpio->chip.get_multiple = dio48e_gpio_get_multiple;
+ dio48egpio->chip.set = dio48e_gpio_set;
+ dio48egpio->chip.set_multiple = dio48e_gpio_set_multiple;
+ dio48egpio->base = base[id];
+
+ girq = &dio48egpio->chip.irq;
+ girq->chip = &dio48e_irqchip;
+ /* This will let us handle the parent IRQ in the driver */
+ girq->parent_handler = NULL;
+ girq->num_parents = 0;
+ girq->parents = NULL;
+ girq->default_type = IRQ_TYPE_NONE;
+ girq->handler = handle_edge_irq;
+ girq->init_hw = dio48e_irq_init_hw;
+
+ raw_spin_lock_init(&dio48egpio->lock);
+
+ /* initialize all GPIO as output */
+ outb(0x80, base[id] + 3);
+ outb(0x00, base[id]);
+ outb(0x00, base[id] + 1);
+ outb(0x00, base[id] + 2);
+ outb(0x00, base[id] + 3);
+ outb(0x80, base[id] + 7);
+ outb(0x00, base[id] + 4);
+ outb(0x00, base[id] + 5);
+ outb(0x00, base[id] + 6);
+ outb(0x00, base[id] + 7);
+
+ err = devm_gpiochip_add_data(dev, &dio48egpio->chip, dio48egpio);
+ if (err) {
+ dev_err(dev, "GPIO registering failed (%d)\n", err);
+ return err;
+ }
+
+ err = devm_request_irq(dev, irq[id], dio48e_irq_handler, 0, name,
+ dio48egpio);
+ if (err) {
+ dev_err(dev, "IRQ handler registering failed (%d)\n", err);
+ return err;
+ }
+
+ return 0;
+}
+
+static struct isa_driver dio48e_driver = {
+ .probe = dio48e_probe,
+ .driver = {
+ .name = "104-dio-48e"
+ },
+};
+module_isa_driver(dio48e_driver, num_dio48e);
+
+MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
+MODULE_DESCRIPTION("ACCES 104-DIO-48E GPIO driver");
+MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 13:34:35 +0000