diff options
Diffstat (limited to 'arch/blackfin/kernel/bfin_gpio.c')
| -rw-r--r-- | arch/blackfin/kernel/bfin_gpio.c | 637 |
1 files changed, 637 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/bfin_gpio.c b/arch/blackfin/kernel/bfin_gpio.c new file mode 100644 index 0000000..e9f24a9 --- /dev/null +++ b/arch/blackfin/kernel/bfin_gpio.c @@ -0,0 +1,637 @@ +/* + * File: arch/blackfin/kernel/bfin_gpio.c + * Based on: + * Author: Michael Hennerich (hennerich@blackfin.uclinux.org) + * + * Created: + * Description: GPIO Abstraction Layer + * + * Modified: + * Copyright 2006 Analog Devices Inc. + * + * Bugs: Enter bugs at http://blackfin.uclinux.org/ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see the file COPYING, or write + * to the Free Software Foundation, Inc., + * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/* +* Number BF537/6/4 BF561 BF533/2/1 +* +* GPIO_0 PF0 PF0 PF0 +* GPIO_1 PF1 PF1 PF1 +* GPIO_2 PF2 PF2 PF2 +* GPIO_3 PF3 PF3 PF3 +* GPIO_4 PF4 PF4 PF4 +* GPIO_5 PF5 PF5 PF5 +* GPIO_6 PF6 PF6 PF6 +* GPIO_7 PF7 PF7 PF7 +* GPIO_8 PF8 PF8 PF8 +* GPIO_9 PF9 PF9 PF9 +* GPIO_10 PF10 PF10 PF10 +* GPIO_11 PF11 PF11 PF11 +* GPIO_12 PF12 PF12 PF12 +* GPIO_13 PF13 PF13 PF13 +* GPIO_14 PF14 PF14 PF14 +* GPIO_15 PF15 PF15 PF15 +* GPIO_16 PG0 PF16 +* GPIO_17 PG1 PF17 +* GPIO_18 PG2 PF18 +* GPIO_19 PG3 PF19 +* GPIO_20 PG4 PF20 +* GPIO_21 PG5 PF21 +* GPIO_22 PG6 PF22 +* GPIO_23 PG7 PF23 +* GPIO_24 PG8 PF24 +* GPIO_25 PG9 PF25 +* GPIO_26 PG10 PF26 +* GPIO_27 PG11 PF27 +* GPIO_28 PG12 PF28 +* GPIO_29 PG13 PF29 +* GPIO_30 PG14 PF30 +* GPIO_31 PG15 PF31 +* GPIO_32 PH0 PF32 +* GPIO_33 PH1 PF33 +* GPIO_34 PH2 PF34 +* GPIO_35 PH3 PF35 +* GPIO_36 PH4 PF36 +* GPIO_37 PH5 PF37 +* GPIO_38 PH6 PF38 +* GPIO_39 PH7 PF39 +* GPIO_40 PH8 PF40 +* GPIO_41 PH9 PF41 +* GPIO_42 PH10 PF42 +* GPIO_43 PH11 PF43 +* GPIO_44 PH12 PF44 +* GPIO_45 PH13 PF45 +* GPIO_46 PH14 PF46 +* GPIO_47 PH15 PF47 +*/ + +#include <linux/module.h> +#include <linux/err.h> +#include <asm/blackfin.h> +#include <asm/gpio.h> +#include <linux/irq.h> + +#ifdef BF533_FAMILY +static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = { + (struct gpio_port_t *) FIO_FLAG_D, +}; +#endif + +#ifdef BF537_FAMILY +static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = { + (struct gpio_port_t *) PORTFIO, + (struct gpio_port_t *) PORTGIO, + (struct gpio_port_t *) PORTHIO, +}; + +static unsigned short *port_fer[gpio_bank(MAX_BLACKFIN_GPIOS)] = { + (unsigned short *) PORTF_FER, + (unsigned short *) PORTG_FER, + (unsigned short *) PORTH_FER, +}; + +#endif + +#ifdef BF561_FAMILY +static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = { + (struct gpio_port_t *) FIO0_FLAG_D, + (struct gpio_port_t *) FIO1_FLAG_D, + (struct gpio_port_t *) FIO2_FLAG_D, +}; +#endif + +static unsigned short reserved_map[gpio_bank(MAX_BLACKFIN_GPIOS)]; + +#ifdef CONFIG_PM +static unsigned short wakeup_map[gpio_bank(MAX_BLACKFIN_GPIOS)]; +static unsigned char wakeup_flags_map[MAX_BLACKFIN_GPIOS]; +static struct gpio_port_s gpio_bank_saved[gpio_bank(MAX_BLACKFIN_GPIOS)]; + +#ifdef BF533_FAMILY +static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG_INTB}; +#endif + +#ifdef BF537_FAMILY +static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG_INTB, IRQ_PORTG_INTB, IRQ_MAC_TX}; +#endif + +#ifdef BF561_FAMILY +static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG0_INTB, IRQ_PROG1_INTB, IRQ_PROG2_INTB}; +#endif + +#endif /* CONFIG_PM */ + +inline int check_gpio(unsigned short gpio) +{ + if (gpio > MAX_BLACKFIN_GPIOS) + return -EINVAL; + return 0; +} + +#ifdef BF537_FAMILY +void port_setup(unsigned short gpio, unsigned short usage) +{ + if (usage == GPIO_USAGE) { + if (*port_fer[gpio_bank(gpio)] & gpio_bit(gpio)) + printk(KERN_WARNING "bfin-gpio: Possible Conflict with Peripheral " + "usage and GPIO %d detected!\n", gpio); + *port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio); + } else + *port_fer[gpio_bank(gpio)] |= gpio_bit(gpio); + SSYNC(); +} +#else +# define port_setup(...) do { } while (0) +#endif + + +void default_gpio(unsigned short gpio) +{ + unsigned short bank,bitmask; + + bank = gpio_bank(gpio); + bitmask = gpio_bit(gpio); + + gpio_bankb[bank]->maska_clear = bitmask; + gpio_bankb[bank]->maskb_clear = bitmask; + SSYNC(); + gpio_bankb[bank]->inen &= ~bitmask; + gpio_bankb[bank]->dir &= ~bitmask; + gpio_bankb[bank]->polar &= ~bitmask; + gpio_bankb[bank]->both &= ~bitmask; + gpio_bankb[bank]->edge &= ~bitmask; +} + + +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; + +#if defined(BF537_FAMILY) && (defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE)) +# if defined(CONFIG_BFIN_MAC_RMII) + reserved_map[PORT_H] = 0xC373; +# else + reserved_map[PORT_H] = 0xFFFF; +# endif +#endif + + return 0; +} + +arch_initcall(bfin_gpio_init); + + +/*********************************************************** +* +* FUNCTIONS: Blackfin General Purpose Ports Access Functions +* +* INPUTS/OUTPUTS: +* gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS +* +* +* DESCRIPTION: These functions abstract direct register access +* to Blackfin processor General Purpose +* Ports Regsiters +* +* CAUTION: These functions do not belong to the GPIO Driver API +************************************************************* +* MODIFICATION HISTORY : +**************************************************************/ + +/* Set a specific bit */ + +#define SET_GPIO(name) \ +void set_gpio_ ## name(unsigned short gpio, unsigned short arg) \ +{ \ + unsigned long flags; \ + BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))); \ + local_irq_save(flags); \ + if (arg) \ + gpio_bankb[gpio_bank(gpio)]->name |= gpio_bit(gpio); \ + else \ + gpio_bankb[gpio_bank(gpio)]->name &= ~gpio_bit(gpio); \ + local_irq_restore(flags); \ +} \ +EXPORT_SYMBOL(set_gpio_ ## name); + +SET_GPIO(dir) +SET_GPIO(inen) +SET_GPIO(polar) +SET_GPIO(edge) +SET_GPIO(both) + + +#define SET_GPIO_SC(name) \ +void set_gpio_ ## name(unsigned short gpio, unsigned short arg) \ +{ \ + BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))); \ + if (arg) \ + gpio_bankb[gpio_bank(gpio)]->name ## _set = gpio_bit(gpio); \ + else \ + gpio_bankb[gpio_bank(gpio)]->name ## _clear = gpio_bit(gpio); \ +} \ +EXPORT_SYMBOL(set_gpio_ ## name); + +SET_GPIO_SC(maska) +SET_GPIO_SC(maskb) + +#if defined(ANOMALY_05000311) +void set_gpio_data(unsigned short gpio, unsigned short arg) +{ + unsigned long flags; + BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))); + local_irq_save(flags); + if (arg) + gpio_bankb[gpio_bank(gpio)]->data_set = gpio_bit(gpio); + else + gpio_bankb[gpio_bank(gpio)]->data_clear = gpio_bit(gpio); + bfin_read_CHIPID(); + local_irq_restore(flags); +} +EXPORT_SYMBOL(set_gpio_data); +#else +SET_GPIO_SC(data) +#endif + + +#if defined(ANOMALY_05000311) +void set_gpio_toggle(unsigned short gpio) +{ + unsigned long flags; + BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))); + local_irq_save(flags); + gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio); + bfin_read_CHIPID(); + local_irq_restore(flags); +} +#else +void set_gpio_toggle(unsigned short gpio) +{ + BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))); + gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio); +} +#endif +EXPORT_SYMBOL(set_gpio_toggle); + + +/*Set current PORT date (16-bit word)*/ + +#define SET_GPIO_P(name) \ +void set_gpiop_ ## name(unsigned short gpio, unsigned short arg) \ +{ \ + gpio_bankb[gpio_bank(gpio)]->name = arg; \ +} \ +EXPORT_SYMBOL(set_gpiop_ ## name); + +SET_GPIO_P(dir) +SET_GPIO_P(inen) +SET_GPIO_P(polar) +SET_GPIO_P(edge) +SET_GPIO_P(both) +SET_GPIO_P(maska) +SET_GPIO_P(maskb) + + +#if defined(ANOMALY_05000311) +void set_gpiop_data(unsigned short gpio, unsigned short arg) +{ + unsigned long flags; + local_irq_save(flags); + gpio_bankb[gpio_bank(gpio)]->data = arg; + bfin_read_CHIPID(); + local_irq_restore(flags); +} +EXPORT_SYMBOL(set_gpiop_data); +#else +SET_GPIO_P(data) +#endif + + + +/* Get a specific bit */ + +#define GET_GPIO(name) \ +unsigned short get_gpio_ ## name(unsigned short gpio) \ +{ \ + return (0x01 & (gpio_bankb[gpio_bank(gpio)]->name >> gpio_sub_n(gpio))); \ +} \ +EXPORT_SYMBOL(get_gpio_ ## name); + +GET_GPIO(dir) +GET_GPIO(inen) +GET_GPIO(polar) +GET_GPIO(edge) +GET_GPIO(both) +GET_GPIO(maska) +GET_GPIO(maskb) + + +#if defined(ANOMALY_05000311) +unsigned short get_gpio_data(unsigned short gpio) +{ + unsigned long flags; + unsigned short ret; + BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))); + local_irq_save(flags); + ret = 0x01 & (gpio_bankb[gpio_bank(gpio)]->data >> gpio_sub_n(gpio)); + bfin_read_CHIPID(); + local_irq_restore(flags); + return ret; +} +EXPORT_SYMBOL(get_gpio_data); +#else +GET_GPIO(data) +#endif + +/*Get current PORT date (16-bit word)*/ + +#define GET_GPIO_P(name) \ +unsigned short get_gpiop_ ## name(unsigned short gpio) \ +{ \ + return (gpio_bankb[gpio_bank(gpio)]->name);\ +} \ +EXPORT_SYMBOL(get_gpiop_ ## name); + +GET_GPIO_P(dir) +GET_GPIO_P(inen) +GET_GPIO_P(polar) +GET_GPIO_P(edge) +GET_GPIO_P(both) +GET_GPIO_P(maska) +GET_GPIO_P(maskb) + +#if defined(ANOMALY_05000311) +unsigned short get_gpiop_data(unsigned short gpio) +{ + unsigned long flags; + unsigned short ret; + local_irq_save(flags); + ret = gpio_bankb[gpio_bank(gpio)]->data; + bfin_read_CHIPID(); + local_irq_restore(flags); + return ret; +} +EXPORT_SYMBOL(get_gpiop_data); +#else +GET_GPIO_P(data) +#endif + +#ifdef CONFIG_PM +/*********************************************************** +* +* FUNCTIONS: Blackfin PM Setup API +* +* INPUTS/OUTPUTS: +* gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS +* type - +* PM_WAKE_RISING +* PM_WAKE_FALLING +* PM_WAKE_HIGH +* PM_WAKE_LOW +* PM_WAKE_BOTH_EDGES +* +* DESCRIPTION: Blackfin PM Driver API +* +* CAUTION: +************************************************************* +* MODIFICATION HISTORY : +**************************************************************/ +int gpio_pm_wakeup_request(unsigned short gpio, unsigned char type) +{ + unsigned long flags; + + if ((check_gpio(gpio) < 0) || !type) + return -EINVAL; + + local_irq_save(flags); + + wakeup_map[gpio_bank(gpio)] |= gpio_bit(gpio); + wakeup_flags_map[gpio] = type; + local_irq_restore(flags); + + return 0; +} +EXPORT_SYMBOL(gpio_pm_wakeup_request); + +void gpio_pm_wakeup_free(unsigned short gpio) +{ + unsigned long flags; + + if (check_gpio(gpio) < 0) + return; + + local_irq_save(flags); + + wakeup_map[gpio_bank(gpio)] &= ~gpio_bit(gpio); + + local_irq_restore(flags); +} +EXPORT_SYMBOL(gpio_pm_wakeup_free); + +static int bfin_gpio_wakeup_type(unsigned short gpio, unsigned char type) +{ + port_setup(gpio, GPIO_USAGE); + set_gpio_dir(gpio, 0); + set_gpio_inen(gpio, 1); + + if (type & (PM_WAKE_RISING | PM_WAKE_FALLING)) + set_gpio_edge(gpio, 1); + else + set_gpio_edge(gpio, 0); + + if ((type & (PM_WAKE_BOTH_EDGES)) == (PM_WAKE_BOTH_EDGES)) + set_gpio_both(gpio, 1); + else + set_gpio_both(gpio, 0); + + if ((type & (PM_WAKE_FALLING | PM_WAKE_LOW))) + set_gpio_polar(gpio, 1); + else + set_gpio_polar(gpio, 0); + + SSYNC(); + + return 0; +} + +u32 gpio_pm_setup(void) +{ + u32 sic_iwr = 0; + u16 bank, mask, i, gpio; + + for (i = 0; i < MAX_BLACKFIN_GPIOS; i+=GPIO_BANKSIZE) { + mask = wakeup_map[gpio_bank(i)]; + bank = gpio_bank(i); + + gpio_bank_saved[bank].maskb = gpio_bankb[bank]->maskb; + gpio_bankb[bank]->maskb = 0; + + if (mask) { +#ifdef BF537_FAMILY + gpio_bank_saved[bank].fer = *port_fer[bank]; +#endif + gpio_bank_saved[bank].inen = gpio_bankb[bank]->inen; + gpio_bank_saved[bank].polar = gpio_bankb[bank]->polar; + gpio_bank_saved[bank].dir = gpio_bankb[bank]->dir; + gpio_bank_saved[bank].edge = gpio_bankb[bank]->edge; + gpio_bank_saved[bank].both = gpio_bankb[bank]->both; + + gpio = i; + + while (mask) { + if (mask & 1) { + bfin_gpio_wakeup_type(gpio, wakeup_flags_map[gpio]); + set_gpio_data(gpio, 0); /*Clear*/ + } + gpio++; + mask >>= 1; + } + + sic_iwr |= 1 << (sic_iwr_irqs[bank] - (IRQ_CORETMR + 1)); + gpio_bankb[bank]->maskb_set = wakeup_map[gpio_bank(i)]; + } + } + + if (sic_iwr) + return sic_iwr; + else + return IWR_ENABLE_ALL; +} + + +void gpio_pm_restore(void) +{ + u16 bank, mask, i; + + for (i = 0; i < MAX_BLACKFIN_GPIOS; i+=GPIO_BANKSIZE) { + mask = wakeup_map[gpio_bank(i)]; + bank = gpio_bank(i); + + if (mask) { +#ifdef BF537_FAMILY + *port_fer[bank] = gpio_bank_saved[bank].fer; +#endif + gpio_bankb[bank]->inen = gpio_bank_saved[bank].inen; + gpio_bankb[bank]->dir = gpio_bank_saved[bank].dir; + gpio_bankb[bank]->polar = gpio_bank_saved[bank].polar; + gpio_bankb[bank]->edge = gpio_bank_saved[bank].edge; + gpio_bankb[bank]->both = gpio_bank_saved[bank].both; + } + + gpio_bankb[bank]->maskb = gpio_bank_saved[bank].maskb; + } +} + +#endif + +/*********************************************************** +* +* FUNCTIONS: Blackfin GPIO Driver +* +* INPUTS/OUTPUTS: +* gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS +* +* +* DESCRIPTION: Blackfin GPIO Driver API +* +* CAUTION: +************************************************************* +* MODIFICATION HISTORY : +**************************************************************/ + +int gpio_request(unsigned short gpio, const char *label) +{ + unsigned long flags; + + if (check_gpio(gpio) < 0) + return -EINVAL; + + local_irq_save(flags); + + if (unlikely(reserved_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); + + local_irq_restore(flags); + + port_setup(gpio, GPIO_USAGE); + + return 0; +} +EXPORT_SYMBOL(gpio_request); + + +void gpio_free(unsigned short gpio) +{ + unsigned long flags; + + if (check_gpio(gpio) < 0) + return; + + local_irq_save(flags); + + if (unlikely(!(reserved_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; + } + + default_gpio(gpio); + + reserved_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))); + + local_irq_save(flags); + gpio_bankb[gpio_bank(gpio)]->dir &= ~gpio_bit(gpio); + gpio_bankb[gpio_bank(gpio)]->inen |= gpio_bit(gpio); + local_irq_restore(flags); +} +EXPORT_SYMBOL(gpio_direction_input); + +void gpio_direction_output(unsigned short gpio) +{ + unsigned long flags; + + BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))); + + local_irq_save(flags); + gpio_bankb[gpio_bank(gpio)]->inen &= ~gpio_bit(gpio); + gpio_bankb[gpio_bank(gpio)]->dir |= gpio_bit(gpio); + local_irq_restore(flags); +} +EXPORT_SYMBOL(gpio_direction_output); |