diff options
Diffstat (limited to 'arch/blackfin/kernel/bfin_gpio.c')
| -rw-r--r-- | arch/blackfin/kernel/bfin_gpio.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/bfin_gpio.c b/arch/blackfin/kernel/bfin_gpio.c index 22705eeff34..a174596cc00 100644 --- a/arch/blackfin/kernel/bfin_gpio.c +++ b/arch/blackfin/kernel/bfin_gpio.c @@ -100,6 +100,12 @@ u8 pmux_offset[][16] = { }; # endif +#elif defined(BF538_FAMILY) +static unsigned short * const port_fer[] = { + (unsigned short *) PORTCIO_FER, + (unsigned short *) PORTDIO_FER, + (unsigned short *) PORTEIO_FER, +}; #endif static unsigned short reserved_gpio_map[GPIO_BANK_NUM]; @@ -163,6 +169,27 @@ static int cmp_label(unsigned short ident, const char *label) static void port_setup(unsigned gpio, unsigned short usage) { +#if defined(BF538_FAMILY) + /* + * BF538/9 Port C,D and E are special. + * Inverted PORT_FER polarity on CDE and no PORF_FER on F + * Regular PORT F GPIOs are handled here, CDE are exclusively + * managed by GPIOLIB + */ + + if (gpio < MAX_BLACKFIN_GPIOS || gpio >= MAX_RESOURCES) + return; + + gpio -= MAX_BLACKFIN_GPIOS; + + if (usage == GPIO_USAGE) + *port_fer[gpio_bank(gpio)] |= gpio_bit(gpio); + else + *port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio); + SSYNC(); + return; +#endif + if (check_gpio(gpio)) return; @@ -762,6 +789,8 @@ int peripheral_request(unsigned short per, const char *label) if (!(per & P_DEFINED)) return -ENODEV; + BUG_ON(ident >= MAX_RESOURCES); + local_irq_save_hw(flags); /* If a pin can be muxed as either GPIO or peripheral, make @@ -979,6 +1008,76 @@ void bfin_gpio_free(unsigned gpio) } EXPORT_SYMBOL(bfin_gpio_free); +#ifdef BFIN_SPECIAL_GPIO_BANKS +static unsigned short reserved_special_gpio_map[gpio_bank(MAX_RESOURCES)]; + +int bfin_special_gpio_request(unsigned gpio, const char *label) +{ + unsigned long flags; + + local_irq_save_hw(flags); + + /* + * Allow that the identical GPIO can + * be requested from the same driver twice + * Do nothing and return - + */ + + if (cmp_label(gpio, label) == 0) { + local_irq_restore_hw(flags); + return 0; + } + + if (unlikely(reserved_special_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) { + local_irq_restore_hw(flags); + printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved by %s !\n", + gpio, get_label(gpio)); + + return -EBUSY; + } + if (unlikely(reserved_peri_map[gpio_bank(gpio)] & gpio_bit(gpio))) { + local_irq_restore_hw(flags); + printk(KERN_ERR + "bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n", + gpio, get_label(gpio)); + + return -EBUSY; + } + + reserved_special_gpio_map[gpio_bank(gpio)] |= gpio_bit(gpio); + reserved_peri_map[gpio_bank(gpio)] |= gpio_bit(gpio); + + set_label(gpio, label); + local_irq_restore_hw(flags); + port_setup(gpio, GPIO_USAGE); + + return 0; +} +EXPORT_SYMBOL(bfin_special_gpio_request); + +void bfin_special_gpio_free(unsigned gpio) +{ + unsigned long flags; + + might_sleep(); + + local_irq_save_hw(flags); + + if (unlikely(!(reserved_special_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)))) { + gpio_error(gpio); + local_irq_restore_hw(flags); + return; + } + + reserved_special_gpio_map[gpio_bank(gpio)] &= ~gpio_bit(gpio); + reserved_peri_map[gpio_bank(gpio)] &= ~gpio_bit(gpio); + set_label(gpio, "free"); + local_irq_restore_hw(flags); +} +EXPORT_SYMBOL(bfin_special_gpio_free); +#endif + + int bfin_gpio_irq_request(unsigned gpio, const char *label) { unsigned long flags; |