linux/drivers/gpio/gpio-ts5500.c
Linus Walleij 97feacc05d gpio: ts5500: Delete platform data handling
The TS5500 GPIO driver apparently supports platform data
without making any use of it whatsoever. Delete this code,
last chance to speak up if you think it is needed.

Cc: kernel@savoirfairelinux.com
Cc: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Cc: Jerome Oufella <jerome.oufella@savoirfairelinux.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2018-09-04 08:22:47 +02:00

450 lines
12 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Digital I/O driver for Technologic Systems TS-5500
*
* Copyright (c) 2012 Savoir-faire Linux Inc.
* Vivien Didelot <vivien.didelot@savoirfairelinux.com>
*
* Technologic Systems platforms have pin blocks, exposing several Digital
* Input/Output lines (DIO). This driver aims to support single pin blocks.
* In that sense, the support is not limited to the TS-5500 blocks.
* Actually, the following platforms have DIO support:
*
* TS-5500:
* Documentation: http://wiki.embeddedarm.com/wiki/TS-5500
* Blocks: DIO1, DIO2 and LCD port.
*
* TS-5600:
* Documentation: http://wiki.embeddedarm.com/wiki/TS-5600
* Blocks: LCD port (identical to TS-5500 LCD).
*/
#include <linux/bitops.h>
#include <linux/gpio/driver.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
/* List of supported Technologic Systems platforms DIO blocks */
enum ts5500_blocks { TS5500_DIO1, TS5500_DIO2, TS5500_LCD, TS5600_LCD };
struct ts5500_priv {
const struct ts5500_dio *pinout;
struct gpio_chip gpio_chip;
spinlock_t lock;
bool strap;
u8 hwirq;
};
/*
* Hex 7D is used to control several blocks (e.g. DIO2 and LCD port).
* This flag ensures that the region has been requested by this driver.
*/
static bool hex7d_reserved;
/*
* This structure is used to describe capabilities of DIO lines,
* such as available directions and connected interrupt (if any).
*/
struct ts5500_dio {
const u8 value_addr;
const u8 value_mask;
const u8 control_addr;
const u8 control_mask;
const bool no_input;
const bool no_output;
const u8 irq;
};
#define TS5500_DIO_IN_OUT(vaddr, vbit, caddr, cbit) \
{ \
.value_addr = vaddr, \
.value_mask = BIT(vbit), \
.control_addr = caddr, \
.control_mask = BIT(cbit), \
}
#define TS5500_DIO_IN(addr, bit) \
{ \
.value_addr = addr, \
.value_mask = BIT(bit), \
.no_output = true, \
}
#define TS5500_DIO_IN_IRQ(addr, bit, _irq) \
{ \
.value_addr = addr, \
.value_mask = BIT(bit), \
.no_output = true, \
.irq = _irq, \
}
#define TS5500_DIO_OUT(addr, bit) \
{ \
.value_addr = addr, \
.value_mask = BIT(bit), \
.no_input = true, \
}
/*
* Input/Output DIO lines are programmed in groups of 4. Their values are
* available through 4 consecutive bits in a value port, whereas the direction
* of these 4 lines is driven by only 1 bit in a control port.
*/
#define TS5500_DIO_GROUP(vaddr, vbitfrom, caddr, cbit) \
TS5500_DIO_IN_OUT(vaddr, vbitfrom + 0, caddr, cbit), \
TS5500_DIO_IN_OUT(vaddr, vbitfrom + 1, caddr, cbit), \
TS5500_DIO_IN_OUT(vaddr, vbitfrom + 2, caddr, cbit), \
TS5500_DIO_IN_OUT(vaddr, vbitfrom + 3, caddr, cbit)
/*
* TS-5500 DIO1 block
*
* value control dir hw
* addr bit addr bit in out irq name pin offset
*
* 0x7b 0 0x7a 0 x x DIO1_0 1 0
* 0x7b 1 0x7a 0 x x DIO1_1 3 1
* 0x7b 2 0x7a 0 x x DIO1_2 5 2
* 0x7b 3 0x7a 0 x x DIO1_3 7 3
* 0x7b 4 0x7a 1 x x DIO1_4 9 4
* 0x7b 5 0x7a 1 x x DIO1_5 11 5
* 0x7b 6 0x7a 1 x x DIO1_6 13 6
* 0x7b 7 0x7a 1 x x DIO1_7 15 7
* 0x7c 0 0x7a 5 x x DIO1_8 4 8
* 0x7c 1 0x7a 5 x x DIO1_9 6 9
* 0x7c 2 0x7a 5 x x DIO1_10 8 10
* 0x7c 3 0x7a 5 x x DIO1_11 10 11
* 0x7c 4 x DIO1_12 12 12
* 0x7c 5 x 7 DIO1_13 14 13
*/
static const struct ts5500_dio ts5500_dio1[] = {
TS5500_DIO_GROUP(0x7b, 0, 0x7a, 0),
TS5500_DIO_GROUP(0x7b, 4, 0x7a, 1),
TS5500_DIO_GROUP(0x7c, 0, 0x7a, 5),
TS5500_DIO_IN(0x7c, 4),
TS5500_DIO_IN_IRQ(0x7c, 5, 7),
};
/*
* TS-5500 DIO2 block
*
* value control dir hw
* addr bit addr bit in out irq name pin offset
*
* 0x7e 0 0x7d 0 x x DIO2_0 1 0
* 0x7e 1 0x7d 0 x x DIO2_1 3 1
* 0x7e 2 0x7d 0 x x DIO2_2 5 2
* 0x7e 3 0x7d 0 x x DIO2_3 7 3
* 0x7e 4 0x7d 1 x x DIO2_4 9 4
* 0x7e 5 0x7d 1 x x DIO2_5 11 5
* 0x7e 6 0x7d 1 x x DIO2_6 13 6
* 0x7e 7 0x7d 1 x x DIO2_7 15 7
* 0x7f 0 0x7d 5 x x DIO2_8 4 8
* 0x7f 1 0x7d 5 x x DIO2_9 6 9
* 0x7f 2 0x7d 5 x x DIO2_10 8 10
* 0x7f 3 0x7d 5 x x DIO2_11 10 11
* 0x7f 4 x 6 DIO2_13 14 12
*/
static const struct ts5500_dio ts5500_dio2[] = {
TS5500_DIO_GROUP(0x7e, 0, 0x7d, 0),
TS5500_DIO_GROUP(0x7e, 4, 0x7d, 1),
TS5500_DIO_GROUP(0x7f, 0, 0x7d, 5),
TS5500_DIO_IN_IRQ(0x7f, 4, 6),
};
/*
* TS-5500 LCD port used as DIO block
* TS-5600 LCD port is identical
*
* value control dir hw
* addr bit addr bit in out irq name pin offset
*
* 0x72 0 0x7d 2 x x LCD_0 8 0
* 0x72 1 0x7d 2 x x LCD_1 7 1
* 0x72 2 0x7d 2 x x LCD_2 10 2
* 0x72 3 0x7d 2 x x LCD_3 9 3
* 0x72 4 0x7d 3 x x LCD_4 12 4
* 0x72 5 0x7d 3 x x LCD_5 11 5
* 0x72 6 0x7d 3 x x LCD_6 14 6
* 0x72 7 0x7d 3 x x LCD_7 13 7
* 0x73 0 x LCD_EN 5 8
* 0x73 6 x LCD_WR 6 9
* 0x73 7 x 1 LCD_RS 3 10
*/
static const struct ts5500_dio ts5500_lcd[] = {
TS5500_DIO_GROUP(0x72, 0, 0x7d, 2),
TS5500_DIO_GROUP(0x72, 4, 0x7d, 3),
TS5500_DIO_OUT(0x73, 0),
TS5500_DIO_IN(0x73, 6),
TS5500_DIO_IN_IRQ(0x73, 7, 1),
};
static inline void ts5500_set_mask(u8 mask, u8 addr)
{
u8 val = inb(addr);
val |= mask;
outb(val, addr);
}
static inline void ts5500_clear_mask(u8 mask, u8 addr)
{
u8 val = inb(addr);
val &= ~mask;
outb(val, addr);
}
static int ts5500_gpio_input(struct gpio_chip *chip, unsigned offset)
{
struct ts5500_priv *priv = gpiochip_get_data(chip);
const struct ts5500_dio line = priv->pinout[offset];
unsigned long flags;
if (line.no_input)
return -ENXIO;
if (line.no_output)
return 0;
spin_lock_irqsave(&priv->lock, flags);
ts5500_clear_mask(line.control_mask, line.control_addr);
spin_unlock_irqrestore(&priv->lock, flags);
return 0;
}
static int ts5500_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct ts5500_priv *priv = gpiochip_get_data(chip);
const struct ts5500_dio line = priv->pinout[offset];
return !!(inb(line.value_addr) & line.value_mask);
}
static int ts5500_gpio_output(struct gpio_chip *chip, unsigned offset, int val)
{
struct ts5500_priv *priv = gpiochip_get_data(chip);
const struct ts5500_dio line = priv->pinout[offset];
unsigned long flags;
if (line.no_output)
return -ENXIO;
spin_lock_irqsave(&priv->lock, flags);
if (!line.no_input)
ts5500_set_mask(line.control_mask, line.control_addr);
if (val)
ts5500_set_mask(line.value_mask, line.value_addr);
else
ts5500_clear_mask(line.value_mask, line.value_addr);
spin_unlock_irqrestore(&priv->lock, flags);
return 0;
}
static void ts5500_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
{
struct ts5500_priv *priv = gpiochip_get_data(chip);
const struct ts5500_dio line = priv->pinout[offset];
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
if (val)
ts5500_set_mask(line.value_mask, line.value_addr);
else
ts5500_clear_mask(line.value_mask, line.value_addr);
spin_unlock_irqrestore(&priv->lock, flags);
}
static int ts5500_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
struct ts5500_priv *priv = gpiochip_get_data(chip);
const struct ts5500_dio *block = priv->pinout;
const struct ts5500_dio line = block[offset];
/* Only one pin is connected to an interrupt */
if (line.irq)
return line.irq;
/* As this pin is input-only, we may strap it to another in/out pin */
if (priv->strap)
return priv->hwirq;
return -ENXIO;
}
static int ts5500_enable_irq(struct ts5500_priv *priv)
{
int ret = 0;
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
if (priv->hwirq == 7)
ts5500_set_mask(BIT(7), 0x7a); /* DIO1_13 on IRQ7 */
else if (priv->hwirq == 6)
ts5500_set_mask(BIT(7), 0x7d); /* DIO2_13 on IRQ6 */
else if (priv->hwirq == 1)
ts5500_set_mask(BIT(6), 0x7d); /* LCD_RS on IRQ1 */
else
ret = -EINVAL;
spin_unlock_irqrestore(&priv->lock, flags);
return ret;
}
static void ts5500_disable_irq(struct ts5500_priv *priv)
{
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
if (priv->hwirq == 7)
ts5500_clear_mask(BIT(7), 0x7a); /* DIO1_13 on IRQ7 */
else if (priv->hwirq == 6)
ts5500_clear_mask(BIT(7), 0x7d); /* DIO2_13 on IRQ6 */
else if (priv->hwirq == 1)
ts5500_clear_mask(BIT(6), 0x7d); /* LCD_RS on IRQ1 */
else
dev_err(priv->gpio_chip.parent, "invalid hwirq %d\n",
priv->hwirq);
spin_unlock_irqrestore(&priv->lock, flags);
}
static int ts5500_dio_probe(struct platform_device *pdev)
{
enum ts5500_blocks block = platform_get_device_id(pdev)->driver_data;
struct device *dev = &pdev->dev;
const char *name = dev_name(dev);
struct ts5500_priv *priv;
struct resource *res;
unsigned long flags;
int ret;
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (!res) {
dev_err(dev, "missing IRQ resource\n");
return -EINVAL;
}
priv = devm_kzalloc(dev, sizeof(struct ts5500_priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
platform_set_drvdata(pdev, priv);
priv->hwirq = res->start;
spin_lock_init(&priv->lock);
priv->gpio_chip.owner = THIS_MODULE;
priv->gpio_chip.label = name;
priv->gpio_chip.parent = dev;
priv->gpio_chip.direction_input = ts5500_gpio_input;
priv->gpio_chip.direction_output = ts5500_gpio_output;
priv->gpio_chip.get = ts5500_gpio_get;
priv->gpio_chip.set = ts5500_gpio_set;
priv->gpio_chip.to_irq = ts5500_gpio_to_irq;
priv->gpio_chip.base = -1;
switch (block) {
case TS5500_DIO1:
priv->pinout = ts5500_dio1;
priv->gpio_chip.ngpio = ARRAY_SIZE(ts5500_dio1);
if (!devm_request_region(dev, 0x7a, 3, name)) {
dev_err(dev, "failed to request %s ports\n", name);
return -EBUSY;
}
break;
case TS5500_DIO2:
priv->pinout = ts5500_dio2;
priv->gpio_chip.ngpio = ARRAY_SIZE(ts5500_dio2);
if (!devm_request_region(dev, 0x7e, 2, name)) {
dev_err(dev, "failed to request %s ports\n", name);
return -EBUSY;
}
if (hex7d_reserved)
break;
if (!devm_request_region(dev, 0x7d, 1, name)) {
dev_err(dev, "failed to request %s 7D\n", name);
return -EBUSY;
}
hex7d_reserved = true;
break;
case TS5500_LCD:
case TS5600_LCD:
priv->pinout = ts5500_lcd;
priv->gpio_chip.ngpio = ARRAY_SIZE(ts5500_lcd);
if (!devm_request_region(dev, 0x72, 2, name)) {
dev_err(dev, "failed to request %s ports\n", name);
return -EBUSY;
}
if (!hex7d_reserved) {
if (!devm_request_region(dev, 0x7d, 1, name)) {
dev_err(dev, "failed to request %s 7D\n", name);
return -EBUSY;
}
hex7d_reserved = true;
}
/* Ensure usage of LCD port as DIO */
spin_lock_irqsave(&priv->lock, flags);
ts5500_clear_mask(BIT(4), 0x7d);
spin_unlock_irqrestore(&priv->lock, flags);
break;
}
ret = devm_gpiochip_add_data(dev, &priv->gpio_chip, priv);
if (ret) {
dev_err(dev, "failed to register the gpio chip\n");
return ret;
}
ret = ts5500_enable_irq(priv);
if (ret) {
dev_err(dev, "invalid interrupt %d\n", priv->hwirq);
return ret;
}
return 0;
}
static int ts5500_dio_remove(struct platform_device *pdev)
{
struct ts5500_priv *priv = platform_get_drvdata(pdev);
ts5500_disable_irq(priv);
return 0;
}
static const struct platform_device_id ts5500_dio_ids[] = {
{ "ts5500-dio1", TS5500_DIO1 },
{ "ts5500-dio2", TS5500_DIO2 },
{ "ts5500-dio-lcd", TS5500_LCD },
{ "ts5600-dio-lcd", TS5600_LCD },
{ }
};
MODULE_DEVICE_TABLE(platform, ts5500_dio_ids);
static struct platform_driver ts5500_dio_driver = {
.driver = {
.name = "ts5500-dio",
},
.probe = ts5500_dio_probe,
.remove = ts5500_dio_remove,
.id_table = ts5500_dio_ids,
};
module_platform_driver(ts5500_dio_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Savoir-faire Linux Inc. <kernel@savoirfairelinux.com>");
MODULE_DESCRIPTION("Technologic Systems TS-5500 Digital I/O driver");