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gpio-exar/8250-exar: Make set of exported GPIOs configurable

Browse source 
On the SIMATIC, IOT2040 only a single pin is exportable as GPIO, the
rest is required to operate the UART. To allow modeling this case,
expand the platform device data structure to specify a (consecutive) pin
subset for exporting by the gpio-exar driver.

Signed-off-by: Jan Kiszka <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
This commit is contained in:
Jan Kiszka 2017-05-22 12:43:18 +02:00
commit 380b1e2f3a
2 changed files with 45 additions and 26 deletions
Download patch file Download diff file Expand all files Collapse all files

56
drivers/gpio/gpio-exar.c
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@ -31,6 +31,7 @@ struct exar_gpio_chip {
int index;
void __iomem *regs;
char name[20];
unsigned int first_pin;
};
static void exar_update(struct gpio_chip *chip, unsigned int reg, int val,
@ -51,11 +52,12 @@ static void exar_update(struct gpio_chip *chip, unsigned int reg, int val,
static int exar_set_direction(struct gpio_chip *chip, int direction,
unsigned int offset)
{
unsigned int bank = offset / 8;
unsigned int addr;
struct exar_gpio_chip *exar_gpio = gpiochip_get_data(chip);
unsigned int addr = (offset + exar_gpio->first_pin) / 8 ?
EXAR_OFFSET_MPIOSEL_HI : EXAR_OFFSET_MPIOSEL_LO;
unsigned int bit = (offset + exar_gpio->first_pin) % 8;
addr = bank ? EXAR_OFFSET_MPIOSEL_HI : EXAR_OFFSET_MPIOSEL_LO;
exar_update(chip, addr, direction, offset % 8);
exar_update(chip, addr, direction, bit);
return 0;
}
@ -73,36 +75,33 @@ static int exar_get(struct gpio_chip *chip, unsigned int reg)
static int exar_get_direction(struct gpio_chip *chip, unsigned int offset)
{
unsigned int bank = offset / 8;
unsigned int addr;
int val;
struct exar_gpio_chip *exar_gpio = gpiochip_get_data(chip);
unsigned int addr = (offset + exar_gpio->first_pin) / 8 ?
EXAR_OFFSET_MPIOSEL_HI : EXAR_OFFSET_MPIOSEL_LO;
unsigned int bit = (offset + exar_gpio->first_pin) % 8;
addr = bank ? EXAR_OFFSET_MPIOSEL_HI : EXAR_OFFSET_MPIOSEL_LO;
val = exar_get(chip, addr) & BIT(offset % 8);
return !!val;
return !!(exar_get(chip, addr) & BIT(bit));
}
static int exar_get_value(struct gpio_chip *chip, unsigned int offset)
{
unsigned int bank = offset / 8;
unsigned int addr;
int val;
struct exar_gpio_chip *exar_gpio = gpiochip_get_data(chip);
unsigned int addr = (offset + exar_gpio->first_pin) / 8 ?
EXAR_OFFSET_MPIOLVL_HI : EXAR_OFFSET_MPIOLVL_LO;
unsigned int bit = (offset + exar_gpio->first_pin) % 8;
addr = bank ? EXAR_OFFSET_MPIOLVL_HI : EXAR_OFFSET_MPIOLVL_LO;
val = exar_get(chip, addr) & BIT(offset % 8);
return !!val;
return !!(exar_get(chip, addr) & BIT(bit));
}
static void exar_set_value(struct gpio_chip *chip, unsigned int offset,
int value)
{
unsigned int bank = offset / 8;
unsigned int addr;
struct exar_gpio_chip *exar_gpio = gpiochip_get_data(chip);
unsigned int addr = (offset + exar_gpio->first_pin) / 8 ?
EXAR_OFFSET_MPIOLVL_HI : EXAR_OFFSET_MPIOLVL_LO;
unsigned int bit = (offset + exar_gpio->first_pin) % 8;
addr = bank ? EXAR_OFFSET_MPIOLVL_HI : EXAR_OFFSET_MPIOLVL_LO;
exar_update(chip, addr, value, offset % 8);
exar_update(chip, addr, value, bit);
}
static int exar_direction_output(struct gpio_chip *chip, unsigned int offset,
@ -121,6 +120,7 @@ static int gpio_exar_probe(struct platform_device *pdev)
{
struct pci_dev *pcidev = to_pci_dev(pdev->dev.parent);
struct exar_gpio_chip *exar_gpio;
u32 first_pin, ngpios;
void __iomem *p;
int index, ret;
@ -132,6 +132,15 @@ static int gpio_exar_probe(struct platform_device *pdev)
if (!p)
return -ENOMEM;
ret = device_property_read_u32(&pdev->dev, "linux,first-pin",
&first_pin);
if (ret)
return ret;
ret = device_property_read_u32(&pdev->dev, "ngpios", &ngpios);
if (ret)
return ret;
exar_gpio = devm_kzalloc(&pdev->dev, sizeof(*exar_gpio), GFP_KERNEL);
if (!exar_gpio)
return -ENOMEM;
@ -149,9 +158,10 @@ static int gpio_exar_probe(struct platform_device *pdev)
exar_gpio->gpio_chip.get = exar_get_value;
exar_gpio->gpio_chip.set = exar_set_value;
exar_gpio->gpio_chip.base = -1;
exar_gpio->gpio_chip.ngpio = 16;
exar_gpio->gpio_chip.ngpio = ngpios;
exar_gpio->regs = p;
exar_gpio->index = index;
exar_gpio->first_pin = first_pin;
ret = devm_gpiochip_add_data(&pdev->dev,
&exar_gpio->gpio_chip, exar_gpio);