diff options
Diffstat (limited to 'arch/powerpc/sysdev/mpc8xxx_gpio.c')
| -rw-r--r-- | arch/powerpc/sysdev/mpc8xxx_gpio.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/arch/powerpc/sysdev/mpc8xxx_gpio.c b/arch/powerpc/sysdev/mpc8xxx_gpio.c index 103eace3619..ee1c0e1cf4a 100644 --- a/arch/powerpc/sysdev/mpc8xxx_gpio.c +++ b/arch/powerpc/sysdev/mpc8xxx_gpio.c @@ -54,6 +54,22 @@ static void mpc8xxx_gpio_save_regs(struct of_mm_gpio_chip *mm) mpc8xxx_gc->data = in_be32(mm->regs + GPIO_DAT); } +/* Workaround GPIO 1 errata on MPC8572/MPC8536. The status of GPIOs + * defined as output cannot be determined by reading GPDAT register, + * so we use shadow data register instead. The status of input pins + * is determined by reading GPDAT register. + */ +static int mpc8572_gpio_get(struct gpio_chip *gc, unsigned int gpio) +{ + u32 val; + struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc); + struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm); + + val = in_be32(mm->regs + GPIO_DAT) & ~in_be32(mm->regs + GPIO_DIR); + + return (val | mpc8xxx_gc->data) & mpc8xxx_gpio2mask(gpio); +} + static int mpc8xxx_gpio_get(struct gpio_chip *gc, unsigned int gpio) { struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc); @@ -136,7 +152,10 @@ static void __init mpc8xxx_add_controller(struct device_node *np) gc->ngpio = MPC8XXX_GPIO_PINS; gc->direction_input = mpc8xxx_gpio_dir_in; gc->direction_output = mpc8xxx_gpio_dir_out; - gc->get = mpc8xxx_gpio_get; + if (of_device_is_compatible(np, "fsl,mpc8572-gpio")) + gc->get = mpc8572_gpio_get; + else + gc->get = mpc8xxx_gpio_get; gc->set = mpc8xxx_gpio_set; ret = of_mm_gpiochip_add(np, mm_gc); |