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path: root/drivers/gpio/gpio-ws16c48.c
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Diffstat (limited to 'drivers/gpio/gpio-ws16c48.c')
-rw-r--r--drivers/gpio/gpio-ws16c48.c140
1 files changed, 98 insertions, 42 deletions
diff --git a/drivers/gpio/gpio-ws16c48.c b/drivers/gpio/gpio-ws16c48.c
index bb02a82e22f4..e73885a4dc32 100644
--- a/drivers/gpio/gpio-ws16c48.c
+++ b/drivers/gpio/gpio-ws16c48.c
@@ -4,7 +4,6 @@
* Copyright (C) 2016 William Breathitt Gray
*/
#include <linux/bitmap.h>
-#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/gpio/driver.h>
@@ -17,8 +16,9 @@
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/spinlock.h>
+#include <linux/types.h>
-#define WS16C48_EXTENT 16
+#define WS16C48_EXTENT 10
#define MAX_NUM_WS16C48 max_num_isa_dev(WS16C48_EXTENT)
static unsigned int base[MAX_NUM_WS16C48];
@@ -27,10 +27,25 @@ module_param_hw_array(base, uint, ioport, &num_ws16c48, 0);
MODULE_PARM_DESC(base, "WinSystems WS16C48 base addresses");
static unsigned int irq[MAX_NUM_WS16C48];
-module_param_hw_array(irq, uint, irq, NULL, 0);
+static unsigned int num_irq;
+module_param_hw_array(irq, uint, irq, &num_irq, 0);
MODULE_PARM_DESC(irq, "WinSystems WS16C48 interrupt line numbers");
/**
+ * struct ws16c48_reg - device register structure
+ * @port: Port 0 through 5 I/O
+ * @int_pending: Interrupt Pending
+ * @page_lock: Register page (Bits 7-6) and I/O port lock (Bits 5-0)
+ * @pol_enab_int_id: Interrupt polarity, enable, and ID
+ */
+struct ws16c48_reg {
+ u8 port[6];
+ u8 int_pending;
+ u8 page_lock;
+ u8 pol_enab_int_id[3];
+};
+
+/**
* struct ws16c48_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)
@@ -38,7 +53,7 @@ MODULE_PARM_DESC(irq, "WinSystems WS16C48 interrupt line numbers");
* @lock: synchronization lock to prevent I/O race conditions
* @irq_mask: I/O bits affected by interrupts
* @flow_mask: IRQ flow type mask for the respective I/O bits
- * @base: base port address of the GPIO device
+ * @reg: I/O address offset for the device registers
*/
struct ws16c48_gpio {
struct gpio_chip chip;
@@ -47,7 +62,7 @@ struct ws16c48_gpio {
raw_spinlock_t lock;
unsigned long irq_mask;
unsigned long flow_mask;
- unsigned base;
+ struct ws16c48_reg __iomem *reg;
};
static int ws16c48_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
@@ -73,7 +88,7 @@ static int ws16c48_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
ws16c48gpio->io_state[port] |= mask;
ws16c48gpio->out_state[port] &= ~mask;
- outb(ws16c48gpio->out_state[port], ws16c48gpio->base + port);
+ iowrite8(ws16c48gpio->out_state[port], ws16c48gpio->reg->port + port);
raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
@@ -95,7 +110,7 @@ static int ws16c48_gpio_direction_output(struct gpio_chip *chip,
ws16c48gpio->out_state[port] |= mask;
else
ws16c48gpio->out_state[port] &= ~mask;
- outb(ws16c48gpio->out_state[port], ws16c48gpio->base + port);
+ iowrite8(ws16c48gpio->out_state[port], ws16c48gpio->reg->port + port);
raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
@@ -118,7 +133,7 @@ static int ws16c48_gpio_get(struct gpio_chip *chip, unsigned offset)
return -EINVAL;
}
- port_state = inb(ws16c48gpio->base + port);
+ port_state = ioread8(ws16c48gpio->reg->port + port);
raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
@@ -131,15 +146,17 @@ static int ws16c48_gpio_get_multiple(struct gpio_chip *chip,
struct ws16c48_gpio *const ws16c48gpio = gpiochip_get_data(chip);
unsigned long offset;
unsigned long gpio_mask;
- unsigned int port_addr;
+ size_t index;
+ u8 __iomem *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, chip->ngpio) {
- port_addr = ws16c48gpio->base + offset / 8;
- port_state = inb(port_addr) & gpio_mask;
+ index = offset / 8;
+ port_addr = ws16c48gpio->reg->port + index;
+ port_state = ioread8(port_addr) & gpio_mask;
bitmap_set_value8(bits, port_state, offset);
}
@@ -166,7 +183,7 @@ static void ws16c48_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
ws16c48gpio->out_state[port] |= mask;
else
ws16c48gpio->out_state[port] &= ~mask;
- outb(ws16c48gpio->out_state[port], ws16c48gpio->base + port);
+ iowrite8(ws16c48gpio->out_state[port], ws16c48gpio->reg->port + port);
raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
}
@@ -178,13 +195,13 @@ static void ws16c48_gpio_set_multiple(struct gpio_chip *chip,
unsigned long offset;
unsigned long gpio_mask;
size_t index;
- unsigned int port_addr;
+ u8 __iomem *port_addr;
unsigned long bitmask;
unsigned long flags;
for_each_set_clump8(offset, gpio_mask, mask, chip->ngpio) {
index = offset / 8;
- port_addr = ws16c48gpio->base + index;
+ port_addr = ws16c48gpio->reg->port + index;
/* mask out GPIO configured for input */
gpio_mask &= ~ws16c48gpio->io_state[index];
@@ -195,7 +212,7 @@ static void ws16c48_gpio_set_multiple(struct gpio_chip *chip,
/* update output state data and set device gpio register */
ws16c48gpio->out_state[index] &= ~gpio_mask;
ws16c48gpio->out_state[index] |= bitmask;
- outb(ws16c48gpio->out_state[index], port_addr);
+ iowrite8(ws16c48gpio->out_state[index], port_addr);
raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
}
@@ -219,10 +236,15 @@ static void ws16c48_irq_ack(struct irq_data *data)
port_state = ws16c48gpio->irq_mask >> (8*port);
- outb(0x80, ws16c48gpio->base + 7);
- outb(port_state & ~mask, ws16c48gpio->base + 8 + port);
- outb(port_state | mask, ws16c48gpio->base + 8 + port);
- outb(0xC0, ws16c48gpio->base + 7);
+ /* Select Register Page 2; Unlock all I/O ports */
+ iowrite8(0x80, &ws16c48gpio->reg->page_lock);
+
+ /* Clear pending interrupt */
+ iowrite8(port_state & ~mask, ws16c48gpio->reg->pol_enab_int_id + port);
+ iowrite8(port_state | mask, ws16c48gpio->reg->pol_enab_int_id + port);
+
+ /* Select Register Page 3; Unlock all I/O ports */
+ iowrite8(0xC0, &ws16c48gpio->reg->page_lock);
raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
}
@@ -235,6 +257,7 @@ static void ws16c48_irq_mask(struct irq_data *data)
const unsigned long mask = BIT(offset);
const unsigned port = offset / 8;
unsigned long flags;
+ unsigned long port_state;
/* only the first 3 ports support interrupts */
if (port > 2)
@@ -243,10 +266,17 @@ static void ws16c48_irq_mask(struct irq_data *data)
raw_spin_lock_irqsave(&ws16c48gpio->lock, flags);
ws16c48gpio->irq_mask &= ~mask;
+ gpiochip_disable_irq(chip, offset);
+ port_state = ws16c48gpio->irq_mask >> (8 * port);
+
+ /* Select Register Page 2; Unlock all I/O ports */
+ iowrite8(0x80, &ws16c48gpio->reg->page_lock);
+
+ /* Disable interrupt */
+ iowrite8(port_state, ws16c48gpio->reg->pol_enab_int_id + port);
- outb(0x80, ws16c48gpio->base + 7);
- outb(ws16c48gpio->irq_mask >> (8*port), ws16c48gpio->base + 8 + port);
- outb(0xC0, ws16c48gpio->base + 7);
+ /* Select Register Page 3; Unlock all I/O ports */
+ iowrite8(0xC0, &ws16c48gpio->reg->page_lock);
raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
}
@@ -259,6 +289,7 @@ static void ws16c48_irq_unmask(struct irq_data *data)
const unsigned long mask = BIT(offset);
const unsigned port = offset / 8;
unsigned long flags;
+ unsigned long port_state;
/* only the first 3 ports support interrupts */
if (port > 2)
@@ -266,11 +297,18 @@ static void ws16c48_irq_unmask(struct irq_data *data)
raw_spin_lock_irqsave(&ws16c48gpio->lock, flags);
+ gpiochip_enable_irq(chip, offset);
ws16c48gpio->irq_mask |= mask;
+ port_state = ws16c48gpio->irq_mask >> (8 * port);
+
+ /* Select Register Page 2; Unlock all I/O ports */
+ iowrite8(0x80, &ws16c48gpio->reg->page_lock);
+
+ /* Enable interrupt */
+ iowrite8(port_state, ws16c48gpio->reg->pol_enab_int_id + port);
- outb(0x80, ws16c48gpio->base + 7);
- outb(ws16c48gpio->irq_mask >> (8*port), ws16c48gpio->base + 8 + port);
- outb(0xC0, ws16c48gpio->base + 7);
+ /* Select Register Page 3; Unlock all I/O ports */
+ iowrite8(0xC0, &ws16c48gpio->reg->page_lock);
raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
}
@@ -283,6 +321,7 @@ static int ws16c48_irq_set_type(struct irq_data *data, unsigned flow_type)
const unsigned long mask = BIT(offset);
const unsigned port = offset / 8;
unsigned long flags;
+ unsigned long port_state;
/* only the first 3 ports support interrupts */
if (port > 2)
@@ -304,46 +343,56 @@ static int ws16c48_irq_set_type(struct irq_data *data, unsigned flow_type)
return -EINVAL;
}
- outb(0x40, ws16c48gpio->base + 7);
- outb(ws16c48gpio->flow_mask >> (8*port), ws16c48gpio->base + 8 + port);
- outb(0xC0, ws16c48gpio->base + 7);
+ port_state = ws16c48gpio->flow_mask >> (8 * port);
+
+ /* Select Register Page 1; Unlock all I/O ports */
+ iowrite8(0x40, &ws16c48gpio->reg->page_lock);
+
+ /* Set interrupt polarity */
+ iowrite8(port_state, ws16c48gpio->reg->pol_enab_int_id + port);
+
+ /* Select Register Page 3; Unlock all I/O ports */
+ iowrite8(0xC0, &ws16c48gpio->reg->page_lock);
raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
return 0;
}
-static struct irq_chip ws16c48_irqchip = {
+static const struct irq_chip ws16c48_irqchip = {
.name = "ws16c48",
.irq_ack = ws16c48_irq_ack,
.irq_mask = ws16c48_irq_mask,
.irq_unmask = ws16c48_irq_unmask,
- .irq_set_type = ws16c48_irq_set_type
+ .irq_set_type = ws16c48_irq_set_type,
+ .flags = IRQCHIP_IMMUTABLE,
+ GPIOCHIP_IRQ_RESOURCE_HELPERS,
};
static irqreturn_t ws16c48_irq_handler(int irq, void *dev_id)
{
struct ws16c48_gpio *const ws16c48gpio = dev_id;
struct gpio_chip *const chip = &ws16c48gpio->chip;
+ struct ws16c48_reg __iomem *const reg = ws16c48gpio->reg;
unsigned long int_pending;
unsigned long port;
unsigned long int_id;
unsigned long gpio;
- int_pending = inb(ws16c48gpio->base + 6) & 0x7;
+ int_pending = ioread8(&reg->int_pending) & 0x7;
if (!int_pending)
return IRQ_NONE;
/* loop until all pending interrupts are handled */
do {
for_each_set_bit(port, &int_pending, 3) {
- int_id = inb(ws16c48gpio->base + 8 + port);
+ int_id = ioread8(reg->pol_enab_int_id + port);
for_each_set_bit(gpio, &int_id, 8)
generic_handle_domain_irq(chip->irq.domain,
gpio + 8*port);
}
- int_pending = inb(ws16c48gpio->base + 6) & 0x7;
+ int_pending = ioread8(&reg->int_pending) & 0x7;
} while (int_pending);
return IRQ_HANDLED;
@@ -369,12 +418,16 @@ static int ws16c48_irq_init_hw(struct gpio_chip *gc)
{
struct ws16c48_gpio *const ws16c48gpio = gpiochip_get_data(gc);
- /* Disable IRQ by default */
- outb(0x80, ws16c48gpio->base + 7);
- outb(0, ws16c48gpio->base + 8);
- outb(0, ws16c48gpio->base + 9);
- outb(0, ws16c48gpio->base + 10);
- outb(0xC0, ws16c48gpio->base + 7);
+ /* Select Register Page 2; Unlock all I/O ports */
+ iowrite8(0x80, &ws16c48gpio->reg->page_lock);
+
+ /* Disable interrupts for all lines */
+ iowrite8(0, &ws16c48gpio->reg->pol_enab_int_id[0]);
+ iowrite8(0, &ws16c48gpio->reg->pol_enab_int_id[1]);
+ iowrite8(0, &ws16c48gpio->reg->pol_enab_int_id[2]);
+
+ /* Select Register Page 3; Unlock all I/O ports */
+ iowrite8(0xC0, &ws16c48gpio->reg->page_lock);
return 0;
}
@@ -396,6 +449,10 @@ static int ws16c48_probe(struct device *dev, unsigned int id)
return -EBUSY;
}
+ ws16c48gpio->reg = devm_ioport_map(dev, base[id], WS16C48_EXTENT);
+ if (!ws16c48gpio->reg)
+ return -ENOMEM;
+
ws16c48gpio->chip.label = name;
ws16c48gpio->chip.parent = dev;
ws16c48gpio->chip.owner = THIS_MODULE;
@@ -409,10 +466,9 @@ static int ws16c48_probe(struct device *dev, unsigned int id)
ws16c48gpio->chip.get_multiple = ws16c48_gpio_get_multiple;
ws16c48gpio->chip.set = ws16c48_gpio_set;
ws16c48gpio->chip.set_multiple = ws16c48_gpio_set_multiple;
- ws16c48gpio->base = base[id];
girq = &ws16c48gpio->chip.irq;
- girq->chip = &ws16c48_irqchip;
+ gpio_irq_chip_set_chip(girq, &ws16c48_irqchip);
/* This will let us handle the parent IRQ in the driver */
girq->parent_handler = NULL;
girq->num_parents = 0;
@@ -446,7 +502,7 @@ static struct isa_driver ws16c48_driver = {
},
};
-module_isa_driver(ws16c48_driver, num_ws16c48);
+module_isa_driver_with_irq(ws16c48_driver, num_ws16c48, num_irq);
MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
MODULE_DESCRIPTION("WinSystems WS16C48 GPIO driver");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.