diff options
Diffstat (limited to 'arch/blackfin')
| -rw-r--r-- | arch/blackfin/mach-bf548/gpio.c | 189 |
1 files changed, 160 insertions, 29 deletions
diff --git a/arch/blackfin/mach-bf548/gpio.c b/arch/blackfin/mach-bf548/gpio.c index 9b1a00aabf2..0da5f0003b8 100644 --- a/arch/blackfin/mach-bf548/gpio.c +++ b/arch/blackfin/mach-bf548/gpio.c @@ -31,38 +31,64 @@ #include <linux/err.h> #include <asm/blackfin.h> #include <asm/gpio.h> +#include <asm/portmux.h> #include <linux/irq.h> static struct gpio_port_t *gpio_array[gpio_bank(MAX_BLACKFIN_GPIOS)] = { - (struct gpio_port_t *) PORTA_FER, - (struct gpio_port_t *) PORTB_FER, - (struct gpio_port_t *) PORTC_FER, - (struct gpio_port_t *) PORTD_FER, - (struct gpio_port_t *) PORTE_FER, - (struct gpio_port_t *) PORTF_FER, - (struct gpio_port_t *) PORTG_FER, - (struct gpio_port_t *) PORTH_FER, - (struct gpio_port_t *) PORTI_FER, - (struct gpio_port_t *) PORTJ_FER, + (struct gpio_port_t *)PORTA_FER, + (struct gpio_port_t *)PORTB_FER, + (struct gpio_port_t *)PORTC_FER, + (struct gpio_port_t *)PORTD_FER, + (struct gpio_port_t *)PORTE_FER, + (struct gpio_port_t *)PORTF_FER, + (struct gpio_port_t *)PORTG_FER, + (struct gpio_port_t *)PORTH_FER, + (struct gpio_port_t *)PORTI_FER, + (struct gpio_port_t *)PORTJ_FER, }; -static unsigned short reserved_map[gpio_bank(MAX_BLACKFIN_GPIOS)]; +static unsigned short reserved_gpio_map[gpio_bank(MAX_BLACKFIN_GPIOS)]; +static unsigned short reserved_peri_map[gpio_bank(MAX_BLACKFIN_GPIOS)]; inline int check_gpio(unsigned short gpio) { - if (gpio == GPIO_PB15 || gpio == GPIO_PC14 || gpio == GPIO_PC15 \ - || gpio == GPIO_PH14 || gpio == GPIO_PH15 \ - || gpio == GPIO_PJ14 || gpio == GPIO_PJ15 \ - || gpio > MAX_BLACKFIN_GPIOS) + if (gpio == GPIO_PB15 || gpio == GPIO_PC14 || gpio == GPIO_PC15 + || gpio == GPIO_PH14 || gpio == GPIO_PH15 + || gpio == GPIO_PJ14 || gpio == GPIO_PJ15 + || gpio > MAX_BLACKFIN_GPIOS) return -EINVAL; return 0; } +inline void portmux_setup(unsigned short portno, unsigned short function) +{ + u32 pmux; + + pmux = gpio_array[gpio_bank(portno)]->port_mux; + + pmux &= ~(0x3 << (2 * gpio_sub_n(portno))); + pmux |= (function & 0x3) << (2 * gpio_sub_n(portno)); + + gpio_array[gpio_bank(portno)]->port_mux = pmux; + +} + +inline u16 get_portmux(unsigned short portno) +{ + u32 pmux; + + pmux = gpio_array[gpio_bank(portno)]->port_mux; + + return (pmux >> (2 * gpio_sub_n(portno)) & 0x3); + +} + static void port_setup(unsigned short gpio, unsigned short usage) { if (usage == GPIO_USAGE) { if (gpio_array[gpio_bank(gpio)]->port_fer & gpio_bit(gpio)) - printk(KERN_WARNING "bfin-gpio: Possible Conflict with Peripheral " + printk(KERN_WARNING + "bfin-gpio: Possible Conflict with Peripheral " "usage and GPIO %d detected!\n", gpio); gpio_array[gpio_bank(gpio)]->port_fer &= ~gpio_bit(gpio); } else @@ -72,18 +98,116 @@ static void port_setup(unsigned short gpio, unsigned short usage) static int __init bfin_gpio_init(void) { - int i; - printk(KERN_INFO "Blackfin GPIO Controller\n"); - for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) - reserved_map[gpio_bank(i)] = 0; - return 0; } arch_initcall(bfin_gpio_init); +int peripheral_request(unsigned short per, const char *label) +{ + unsigned long flags; + unsigned short ident = P_IDENT(per); + + if (!(per & P_DEFINED)) + return -ENODEV; + + if (check_gpio(ident) < 0) + return -EINVAL; + + local_irq_save(flags); + + if (unlikely(reserved_gpio_map[gpio_bank(ident)] & gpio_bit(ident))) { + printk(KERN_ERR + "%s: Peripheral %d is already reserved as GPIO!\n", + __FUNCTION__, per); + dump_stack(); + local_irq_restore(flags); + return -EBUSY; + } + + if (unlikely(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident))) { + + u16 funct = get_portmux(ident); + + if (!((per & P_MAYSHARE) && (funct == P_FUNCT2MUX(per)))) { + printk(KERN_ERR + "%s: Peripheral %d is already reserved!\n", + __FUNCTION__, per); + dump_stack(); + local_irq_restore(flags); + return -EBUSY; + } + } + + reserved_peri_map[gpio_bank(ident)] |= gpio_bit(ident); + + portmux_setup(ident, P_FUNCT2MUX(per)); + port_setup(ident, PERIPHERAL_USAGE); + + local_irq_restore(flags); + + return 0; +} +EXPORT_SYMBOL(peripheral_request); + +int peripheral_request_list(unsigned short per[], const char *label) +{ + + u16 cnt; + int ret; + + for (cnt = 0; per[cnt] != 0; cnt++) { + ret = peripheral_request(per[cnt], label); + if (ret < 0) + return ret; + } + + return 0; +} +EXPORT_SYMBOL(peripheral_request_list); + +void peripheral_free(unsigned short per) +{ + unsigned long flags; + unsigned short ident = P_IDENT(per); + + if (!(per & P_DEFINED)) + return; + + if (check_gpio(ident) < 0) + return; + + local_irq_save(flags); + + if (unlikely(!(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident)))) { + printk(KERN_ERR "bfin-gpio: Peripheral %d wasn't reserved!\n", per); + dump_stack(); + local_irq_restore(flags); + return; + } + + if (!(per & P_MAYSHARE)) { + port_setup(ident, GPIO_USAGE); + } + + reserved_peri_map[gpio_bank(ident)] &= ~gpio_bit(ident); + + local_irq_restore(flags); +} +EXPORT_SYMBOL(peripheral_free); + +void peripheral_free_list(unsigned short per[]) +{ + u16 cnt; + + for (cnt = 0; per[cnt] != 0; cnt++) { + peripheral_free(per[cnt]); + } + +} +EXPORT_SYMBOL(peripheral_free_list); /*********************************************************** * @@ -109,13 +233,22 @@ int gpio_request(unsigned short gpio, const char *label) local_irq_save(flags); - if (unlikely(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))) { + if (unlikely(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) { printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved!\n", gpio); dump_stack(); local_irq_restore(flags); return -EBUSY; } - reserved_map[gpio_bank(gpio)] |= gpio_bit(gpio); + + if (unlikely(reserved_peri_map[gpio_bank(gpio)] & gpio_bit(gpio))) { + printk(KERN_ERR + "bfin-gpio: GPIO %d is already reserved as Peripheral!\n", gpio); + dump_stack(); + local_irq_restore(flags); + return -EBUSY; + } + + reserved_gpio_map[gpio_bank(gpio)] |= gpio_bit(gpio); local_irq_restore(flags); @@ -125,7 +258,6 @@ int gpio_request(unsigned short gpio, const char *label) } EXPORT_SYMBOL(gpio_request); - void gpio_free(unsigned short gpio) { unsigned long flags; @@ -135,25 +267,24 @@ void gpio_free(unsigned short gpio) local_irq_save(flags); - if (unlikely(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)))) { + if (unlikely(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)))) { printk(KERN_ERR "bfin-gpio: GPIO %d wasn't reserved!\n", gpio); dump_stack(); local_irq_restore(flags); return; } - reserved_map[gpio_bank(gpio)] &= ~gpio_bit(gpio); + reserved_gpio_map[gpio_bank(gpio)] &= ~gpio_bit(gpio); local_irq_restore(flags); } EXPORT_SYMBOL(gpio_free); - void gpio_direction_input(unsigned short gpio) { unsigned long flags; - BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))); + BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))); local_irq_save(flags); gpio_array[gpio_bank(gpio)]->port_dir_clear = gpio_bit(gpio); @@ -166,7 +297,7 @@ void gpio_direction_output(unsigned short gpio) { unsigned long flags; - BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))); + BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))); local_irq_save(flags); gpio_array[gpio_bank(gpio)]->port_inen &= ~gpio_bit(gpio); |