diff options
Diffstat (limited to 'arch/blackfin/cpu/gpio.c')
| -rw-r--r-- | arch/blackfin/cpu/gpio.c | 854 |
1 files changed, 854 insertions, 0 deletions
diff --git a/arch/blackfin/cpu/gpio.c b/arch/blackfin/cpu/gpio.c new file mode 100644 index 00000000000..488ca11bb06 --- /dev/null +++ b/arch/blackfin/cpu/gpio.c @@ -0,0 +1,854 @@ +/* + * GPIO Abstraction Layer + * + * Copyright 2006-2010 Analog Devices Inc. + * + * Licensed under the GPL-2 or later + */ + +#include <common.h> +#include <asm/errno.h> +#include <asm/gpio.h> +#include <asm/portmux.h> + +#if ANOMALY_05000311 || ANOMALY_05000323 +enum { + AWA_data = SYSCR, + AWA_data_clear = SYSCR, + AWA_data_set = SYSCR, + AWA_toggle = SYSCR, + AWA_maska = UART_SCR, + AWA_maska_clear = UART_SCR, + AWA_maska_set = UART_SCR, + AWA_maska_toggle = UART_SCR, + AWA_maskb = UART_GCTL, + AWA_maskb_clear = UART_GCTL, + AWA_maskb_set = UART_GCTL, + AWA_maskb_toggle = UART_GCTL, + AWA_dir = SPORT1_STAT, + AWA_polar = SPORT1_STAT, + AWA_edge = SPORT1_STAT, + AWA_both = SPORT1_STAT, +#if ANOMALY_05000311 + AWA_inen = TIMER_ENABLE, +#elif ANOMALY_05000323 + AWA_inen = DMA1_1_CONFIG, +#endif +}; + /* Anomaly Workaround */ +#define AWA_DUMMY_READ(name) bfin_read16(AWA_ ## name) +#else +#define AWA_DUMMY_READ(...) do { } while (0) +#endif + +static struct gpio_port_t * const gpio_array[] = { +#if defined(BF533_FAMILY) + (struct gpio_port_t *) FIO_FLAG_D, +#elif defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x) \ + || defined(BF538_FAMILY) + (struct gpio_port_t *) PORTFIO, +# if !defined(BF538_FAMILY) + (struct gpio_port_t *) PORTGIO, + (struct gpio_port_t *) PORTHIO, +# endif +#elif defined(BF561_FAMILY) + (struct gpio_port_t *) FIO0_FLAG_D, + (struct gpio_port_t *) FIO1_FLAG_D, + (struct gpio_port_t *) FIO2_FLAG_D, +#elif defined(CONFIG_BF54x) + (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, +#else +# error no gpio arrays defined +#endif +}; + +#if defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x) +static unsigned short * const port_fer[] = { + (unsigned short *) PORTF_FER, + (unsigned short *) PORTG_FER, + (unsigned short *) PORTH_FER, +}; + +# if !defined(BF537_FAMILY) +static unsigned short * const port_mux[] = { + (unsigned short *) PORTF_MUX, + (unsigned short *) PORTG_MUX, + (unsigned short *) PORTH_MUX, +}; + +static const +u8 pmux_offset[][16] = { +# if defined(CONFIG_BF52x) + { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 4, 6, 8, 8, 10, 10 }, /* PORTF */ + { 0, 0, 0, 0, 0, 2, 2, 4, 4, 6, 8, 10, 10, 10, 12, 12 }, /* PORTG */ + { 0, 0, 0, 0, 0, 0, 0, 0, 2, 4, 4, 4, 4, 4, 4, 4 }, /* PORTH */ +# elif defined(CONFIG_BF51x) + { 0, 2, 2, 2, 2, 2, 2, 4, 6, 6, 6, 8, 8, 8, 8, 10 }, /* PORTF */ + { 0, 0, 0, 2, 4, 6, 6, 6, 8, 10, 10, 12, 14, 14, 14, 14 }, /* PORTG */ + { 0, 0, 0, 0, 2, 2, 4, 6, 10, 10, 10, 10, 10, 10, 10, 10 }, /* PORTH */ +# endif +}; +# endif + +#elif defined(BF538_FAMILY) +static unsigned short * const port_fer[] = { + (unsigned short *) PORTCIO_FER, + (unsigned short *) PORTDIO_FER, + (unsigned short *) PORTEIO_FER, +}; +#endif + +#ifdef CONFIG_BFIN_GPIO_TRACK +#define RESOURCE_LABEL_SIZE 16 + +static struct str_ident { + char name[RESOURCE_LABEL_SIZE]; +} str_ident[MAX_RESOURCES]; + +static void gpio_error(unsigned gpio) +{ + printf("bfin-gpio: GPIO %d wasn't requested!\n", gpio); +} + +static void set_label(unsigned short ident, const char *label) +{ + if (label) { + strncpy(str_ident[ident].name, label, + RESOURCE_LABEL_SIZE); + str_ident[ident].name[RESOURCE_LABEL_SIZE - 1] = 0; + } +} + +static char *get_label(unsigned short ident) +{ + return (*str_ident[ident].name ? str_ident[ident].name : "UNKNOWN"); +} + +static int cmp_label(unsigned short ident, const char *label) +{ + if (label == NULL) + printf("bfin-gpio: please provide none-null label\n"); + + if (label) + return strcmp(str_ident[ident].name, label); + else + return -EINVAL; +} + +#define map_entry(m, i) reserved_##m##_map[gpio_bank(i)] +#define is_reserved(m, i, e) (map_entry(m, i) & gpio_bit(i)) +#define reserve(m, i) (map_entry(m, i) |= gpio_bit(i)) +#define unreserve(m, i) (map_entry(m, i) &= ~gpio_bit(i)) +#define DECLARE_RESERVED_MAP(m, c) static unsigned short reserved_##m##_map[c] +#else +#define is_reserved(m, i, e) (!(e)) +#define reserve(m, i) +#define unreserve(m, i) +#define DECLARE_RESERVED_MAP(m, c) +#define gpio_error(gpio) +#define set_label(...) +#define get_label(...) "" +#define cmp_label(...) 1 +#endif + +DECLARE_RESERVED_MAP(gpio, GPIO_BANK_NUM); +DECLARE_RESERVED_MAP(peri, gpio_bank(MAX_RESOURCES)); + +inline int check_gpio(unsigned gpio) +{ +#if defined(CONFIG_BF54x) + if (gpio == GPIO_PB15 || gpio == GPIO_PC14 || gpio == GPIO_PC15 + || gpio == GPIO_PH14 || gpio == GPIO_PH15 + || gpio == GPIO_PJ14 || gpio == GPIO_PJ15) + return -EINVAL; +#endif + if (gpio >= MAX_BLACKFIN_GPIOS) + return -EINVAL; + return 0; +} + +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; + +#if defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x) + if (usage == GPIO_USAGE) + *port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio); + else + *port_fer[gpio_bank(gpio)] |= gpio_bit(gpio); + SSYNC(); +#elif defined(CONFIG_BF54x) + if (usage == GPIO_USAGE) + gpio_array[gpio_bank(gpio)]->port_fer &= ~gpio_bit(gpio); + else + gpio_array[gpio_bank(gpio)]->port_fer |= gpio_bit(gpio); + SSYNC(); +#endif +} + +#ifdef BF537_FAMILY +static struct { + unsigned short res; + unsigned short offset; +} port_mux_lut[] = { + {.res = P_PPI0_D13, .offset = 11}, + {.res = P_PPI0_D14, .offset = 11}, + {.res = P_PPI0_D15, .offset = 11}, + {.res = P_SPORT1_TFS, .offset = 11}, + {.res = P_SPORT1_TSCLK, .offset = 11}, + {.res = P_SPORT1_DTPRI, .offset = 11}, + {.res = P_PPI0_D10, .offset = 10}, + {.res = P_PPI0_D11, .offset = 10}, + {.res = P_PPI0_D12, .offset = 10}, + {.res = P_SPORT1_RSCLK, .offset = 10}, + {.res = P_SPORT1_RFS, .offset = 10}, + {.res = P_SPORT1_DRPRI, .offset = 10}, + {.res = P_PPI0_D8, .offset = 9}, + {.res = P_PPI0_D9, .offset = 9}, + {.res = P_SPORT1_DRSEC, .offset = 9}, + {.res = P_SPORT1_DTSEC, .offset = 9}, + {.res = P_TMR2, .offset = 8}, + {.res = P_PPI0_FS3, .offset = 8}, + {.res = P_TMR3, .offset = 7}, + {.res = P_SPI0_SSEL4, .offset = 7}, + {.res = P_TMR4, .offset = 6}, + {.res = P_SPI0_SSEL5, .offset = 6}, + {.res = P_TMR5, .offset = 5}, + {.res = P_SPI0_SSEL6, .offset = 5}, + {.res = P_UART1_RX, .offset = 4}, + {.res = P_UART1_TX, .offset = 4}, + {.res = P_TMR6, .offset = 4}, + {.res = P_TMR7, .offset = 4}, + {.res = P_UART0_RX, .offset = 3}, + {.res = P_UART0_TX, .offset = 3}, + {.res = P_DMAR0, .offset = 3}, + {.res = P_DMAR1, .offset = 3}, + {.res = P_SPORT0_DTSEC, .offset = 1}, + {.res = P_SPORT0_DRSEC, .offset = 1}, + {.res = P_CAN0_RX, .offset = 1}, + {.res = P_CAN0_TX, .offset = 1}, + {.res = P_SPI0_SSEL7, .offset = 1}, + {.res = P_SPORT0_TFS, .offset = 0}, + {.res = P_SPORT0_DTPRI, .offset = 0}, + {.res = P_SPI0_SSEL2, .offset = 0}, + {.res = P_SPI0_SSEL3, .offset = 0}, +}; + +static void portmux_setup(unsigned short per) +{ + u16 y, offset, muxreg; + u16 function = P_FUNCT2MUX(per); + + for (y = 0; y < ARRAY_SIZE(port_mux_lut); y++) { + if (port_mux_lut[y].res == per) { + + /* SET PORTMUX REG */ + + offset = port_mux_lut[y].offset; + muxreg = bfin_read_PORT_MUX(); + + if (offset != 1) + muxreg &= ~(1 << offset); + else + muxreg &= ~(3 << 1); + + muxreg |= (function << offset); + bfin_write_PORT_MUX(muxreg); + } + } +} +#elif defined(CONFIG_BF54x) +inline void portmux_setup(unsigned short per) +{ + u32 pmux; + u16 ident = P_IDENT(per); + u16 function = P_FUNCT2MUX(per); + + pmux = gpio_array[gpio_bank(ident)]->port_mux; + + pmux &= ~(0x3 << (2 * gpio_sub_n(ident))); + pmux |= (function & 0x3) << (2 * gpio_sub_n(ident)); + + gpio_array[gpio_bank(ident)]->port_mux = pmux; +} + +inline u16 get_portmux(unsigned short per) +{ + u32 pmux; + u16 ident = P_IDENT(per); + + pmux = gpio_array[gpio_bank(ident)]->port_mux; + + return (pmux >> (2 * gpio_sub_n(ident)) & 0x3); +} +#elif defined(CONFIG_BF52x) || defined(CONFIG_BF51x) +inline void portmux_setup(unsigned short per) +{ + u16 pmux, ident = P_IDENT(per), function = P_FUNCT2MUX(per); + u8 offset = pmux_offset[gpio_bank(ident)][gpio_sub_n(ident)]; + + pmux = *port_mux[gpio_bank(ident)]; + pmux &= ~(3 << offset); + pmux |= (function & 3) << offset; + *port_mux[gpio_bank(ident)] = pmux; + SSYNC(); +} +#else +# define portmux_setup(...) do { } while (0) +#endif + +#ifndef CONFIG_BF54x +/*********************************************************** +* +* 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 gpio, unsigned short arg) \ +{ \ + unsigned long flags; \ + local_irq_save(flags); \ + if (arg) \ + gpio_array[gpio_bank(gpio)]->name |= gpio_bit(gpio); \ + else \ + gpio_array[gpio_bank(gpio)]->name &= ~gpio_bit(gpio); \ + AWA_DUMMY_READ(name); \ + local_irq_restore(flags); \ +} + +SET_GPIO(dir) /* set_gpio_dir() */ +SET_GPIO(inen) /* set_gpio_inen() */ +SET_GPIO(polar) /* set_gpio_polar() */ +SET_GPIO(edge) /* set_gpio_edge() */ +SET_GPIO(both) /* set_gpio_both() */ + + +#define SET_GPIO_SC(name) \ +void set_gpio_ ## name(unsigned gpio, unsigned short arg) \ +{ \ + unsigned long flags; \ + if (ANOMALY_05000311 || ANOMALY_05000323) \ + local_irq_save(flags); \ + if (arg) \ + gpio_array[gpio_bank(gpio)]->name ## _set = gpio_bit(gpio); \ + else \ + gpio_array[gpio_bank(gpio)]->name ## _clear = gpio_bit(gpio); \ + if (ANOMALY_05000311 || ANOMALY_05000323) { \ + AWA_DUMMY_READ(name); \ + local_irq_restore(flags); \ + } \ +} + +SET_GPIO_SC(maska) +SET_GPIO_SC(maskb) +SET_GPIO_SC(data) + +void set_gpio_toggle(unsigned gpio) +{ + unsigned long flags; + if (ANOMALY_05000311 || ANOMALY_05000323) + local_irq_save(flags); + gpio_array[gpio_bank(gpio)]->toggle = gpio_bit(gpio); + if (ANOMALY_05000311 || ANOMALY_05000323) { + AWA_DUMMY_READ(toggle); + local_irq_restore(flags); + } +} + +/* Set current PORT date (16-bit word) */ + +#define SET_GPIO_P(name) \ +void set_gpiop_ ## name(unsigned gpio, unsigned short arg) \ +{ \ + unsigned long flags; \ + if (ANOMALY_05000311 || ANOMALY_05000323) \ + local_irq_save(flags); \ + gpio_array[gpio_bank(gpio)]->name = arg; \ + if (ANOMALY_05000311 || ANOMALY_05000323) { \ + AWA_DUMMY_READ(name); \ + local_irq_restore(flags); \ + } \ +} + +SET_GPIO_P(data) +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) + +/* Get a specific bit */ +#define GET_GPIO(name) \ +unsigned short get_gpio_ ## name(unsigned gpio) \ +{ \ + unsigned long flags; \ + unsigned short ret; \ + if (ANOMALY_05000311 || ANOMALY_05000323) \ + local_irq_save(flags); \ + ret = 0x01 & (gpio_array[gpio_bank(gpio)]->name >> gpio_sub_n(gpio)); \ + if (ANOMALY_05000311 || ANOMALY_05000323) { \ + AWA_DUMMY_READ(name); \ + local_irq_restore(flags); \ + } \ + return ret; \ +} + +GET_GPIO(data) +GET_GPIO(dir) +GET_GPIO(inen) +GET_GPIO(polar) +GET_GPIO(edge) +GET_GPIO(both) +GET_GPIO(maska) +GET_GPIO(maskb) + +/* Get current PORT date (16-bit word) */ + +#define GET_GPIO_P(name) \ +unsigned short get_gpiop_ ## name(unsigned gpio) \ +{ \ + unsigned long flags; \ + unsigned short ret; \ + if (ANOMALY_05000311 || ANOMALY_05000323) \ + local_irq_save(flags); \ + ret = (gpio_array[gpio_bank(gpio)]->name); \ + if (ANOMALY_05000311 || ANOMALY_05000323) { \ + AWA_DUMMY_READ(name); \ + local_irq_restore(flags); \ + } \ + return ret; \ +} + +GET_GPIO_P(data) +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) + +#else /* CONFIG_BF54x */ + +unsigned short get_gpio_dir(unsigned gpio) +{ + return (0x01 & (gpio_array[gpio_bank(gpio)]->dir_clear >> gpio_sub_n(gpio))); +} + +#endif /* CONFIG_BF54x */ + +/*********************************************************** +* +* FUNCTIONS: Blackfin Peripheral Resource Allocation +* and PortMux Setup +* +* INPUTS/OUTPUTS: +* per Peripheral Identifier +* label String +* +* DESCRIPTION: Blackfin Peripheral Resource Allocation and Setup API +* +* CAUTION: +************************************************************* +* MODIFICATION HISTORY : +**************************************************************/ + +int peripheral_request(unsigned short per, const char *label) +{ + unsigned short ident = P_IDENT(per); + + /* + * Don't cares are pins with only one dedicated function + */ + + if (per & P_DONTCARE) + return 0; + + if (!(per & P_DEFINED)) + return -ENODEV; + + BUG_ON(ident >= MAX_RESOURCES); + + /* If a pin can be muxed as either GPIO or peripheral, make + * sure it is not already a GPIO pin when we request it. + */ + if (unlikely(!check_gpio(ident) && is_reserved(gpio, ident, 1))) { + printf("%s: Peripheral %d is already reserved as GPIO by %s !\n", + __func__, ident, get_label(ident)); + return -EBUSY; + } + + if (unlikely(is_reserved(peri, ident, 1))) { + + /* + * Pin functions like AMC address strobes my + * be requested and used by several drivers + */ + +#ifdef CONFIG_BF54x + if (!((per & P_MAYSHARE) && get_portmux(per) == P_FUNCT2MUX(per))) { +#else + if (!(per & P_MAYSHARE)) { +#endif + /* + * Allow that the identical pin function can + * be requested from the same driver twice + */ + + if (cmp_label(ident, label) == 0) + goto anyway; + + printf("%s: Peripheral %d function %d is already reserved by %s !\n", + __func__, ident, P_FUNCT2MUX(per), get_label(ident)); + return -EBUSY; + } + } + + anyway: + reserve(peri, ident); + + portmux_setup(per); + port_setup(ident, PERIPHERAL_USAGE); + + set_label(ident, label); + + return 0; +} + +int peripheral_request_list(const 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) { + for ( ; cnt > 0; cnt--) + peripheral_free(per[cnt - 1]); + + return ret; + } + } + + return 0; +} + +void peripheral_free(unsigned short per) +{ + unsigned short ident = P_IDENT(per); + + if (per & P_DONTCARE) + return; + + if (!(per & P_DEFINED)) + return; + + if (unlikely(!is_reserved(peri, ident, 0))) + return; + + if (!(per & P_MAYSHARE)) + port_setup(ident, GPIO_USAGE); + + unreserve(peri, ident); + + set_label(ident, "free"); +} + +void peripheral_free_list(const unsigned short per[]) +{ + u16 cnt; + for (cnt = 0; per[cnt] != 0; cnt++) + peripheral_free(per[cnt]); +} + +/*********************************************************** +* +* FUNCTIONS: Blackfin GPIO Driver +* +* INPUTS/OUTPUTS: +* gpio PIO Number between 0 and MAX_BLACKFIN_GPIOS +* label String +* +* DESCRIPTION: Blackfin GPIO Driver API +* +* CAUTION: +************************************************************* +* MODIFICATION HISTORY : +**************************************************************/ + +int bfin_gpio_request(unsigned gpio, const char *label) +{ + if (check_gpio(gpio) < 0) + return -EINVAL; + + /* + * Allow that the identical GPIO can + * be requested from the same driver twice + * Do nothing and return - + */ + + if (cmp_label(gpio, label) == 0) + return 0; + + if (unlikely(is_reserved(gpio, gpio, 1))) { + printf("bfin-gpio: GPIO %d is already reserved by %s !\n", + gpio, get_label(gpio)); + return -EBUSY; + } + if (unlikely(is_reserved(peri, gpio, 1))) { + printf("bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n", + gpio, get_label(gpio)); + return -EBUSY; + } +#ifndef CONFIG_BF54x + else { /* Reset POLAR setting when acquiring a gpio for the first time */ + set_gpio_polar(gpio, 0); + } +#endif + + reserve(gpio, gpio); + set_label(gpio, label); + + port_setup(gpio, GPIO_USAGE); + + return 0; +} + +void bfin_gpio_free(unsigned gpio) +{ + if (check_gpio(gpio) < 0) + return; + + if (unlikely(!is_reserved(gpio, gpio, 0))) { + gpio_error(gpio); + return; + } + + unreserve(gpio, gpio); + + set_label(gpio, "free"); +} + +#ifdef BFIN_SPECIAL_GPIO_BANKS +DECLARE_RESERVED_MAP(special_gpio, gpio_bank(MAX_RESOURCES)); + +int bfin_special_gpio_request(unsigned gpio, const char *label) +{ + /* + * Allow that the identical GPIO can + * be requested from the same driver twice + * Do nothing and return - + */ + + if (cmp_label(gpio, label) == 0) + return 0; + + if (unlikely(is_reserved(special_gpio, gpio, 1))) { + printf("bfin-gpio: GPIO %d is already reserved by %s !\n", + gpio, get_label(gpio)); + return -EBUSY; + } + if (unlikely(is_reserved(peri, gpio, 1))) { + printf("bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n", + gpio, get_label(gpio)); + + return -EBUSY; + } + + reserve(special_gpio, gpio); + reserve(peri, gpio); + + set_label(gpio, label); + port_setup(gpio, GPIO_USAGE); + + return 0; +} + +void bfin_special_gpio_free(unsigned gpio) +{ + if (unlikely(!is_reserved(special_gpio, gpio, 0))) { + gpio_error(gpio); + return; + } + + reserve(special_gpio, gpio); + reserve(peri, gpio); + set_label(gpio, "free"); +} +#endif + +static inline void __bfin_gpio_direction_input(unsigned gpio) +{ +#ifdef CONFIG_BF54x + gpio_array[gpio_bank(gpio)]->dir_clear = gpio_bit(gpio); +#else + gpio_array[gpio_bank(gpio)]->dir &= ~gpio_bit(gpio); +#endif + gpio_array[gpio_bank(gpio)]->inen |= gpio_bit(gpio); +} + +int bfin_gpio_direction_input(unsigned gpio) +{ + unsigned long flags; + + if (!is_reserved(gpio, gpio, 0)) { + gpio_error(gpio); + return -EINVAL; + } + + local_irq_save(flags); + __bfin_gpio_direction_input(gpio); + AWA_DUMMY_READ(inen); + local_irq_restore(flags); + + return 0; +} + +void bfin_gpio_toggle_value(unsigned gpio) +{ +#ifdef CONFIG_BF54x + gpio_set_value(gpio, !gpio_get_value(gpio)); +#else + gpio_array[gpio_bank(gpio)]->toggle = gpio_bit(gpio); +#endif +} + +void bfin_gpio_set_value(unsigned gpio, int arg) +{ + if (arg) + gpio_array[gpio_bank(gpio)]->data_set = gpio_bit(gpio); + else + gpio_array[gpio_bank(gpio)]->data_clear = gpio_bit(gpio); +} + +int bfin_gpio_direction_output(unsigned gpio, int value) +{ + unsigned long flags; + + if (!is_reserved(gpio, gpio, 0)) { + gpio_error(gpio); + return -EINVAL; + } + + local_irq_save(flags); + + gpio_array[gpio_bank(gpio)]->inen &= ~gpio_bit(gpio); + gpio_set_value(gpio, value); +#ifdef CONFIG_BF54x + gpio_array[gpio_bank(gpio)]->dir_set = gpio_bit(gpio); +#else + gpio_array[gpio_bank(gpio)]->dir |= gpio_bit(gpio); +#endif + + AWA_DUMMY_READ(dir); + local_irq_restore(flags); + + return 0; +} + +int bfin_gpio_get_value(unsigned gpio) +{ +#ifdef CONFIG_BF54x + return (1 & (gpio_array[gpio_bank(gpio)]->data >> gpio_sub_n(gpio))); +#else + unsigned long flags; + + if (unlikely(get_gpio_edge(gpio))) { + int ret; + local_irq_save(flags); + set_gpio_edge(gpio, 0); + ret = get_gpio_data(gpio); + set_gpio_edge(gpio, 1); + local_irq_restore(flags); + return ret; + } else + return get_gpio_data(gpio); +#endif +} + +/* If we are booting from SPI and our board lacks a strong enough pull up, + * the core can reset and execute the bootrom faster than the resistor can + * pull the signal logically high. To work around this (common) error in + * board design, we explicitly set the pin back to GPIO mode, force /CS + * high, and wait for the electrons to do their thing. + * + * This function only makes sense to be called from reset code, but it + * lives here as we need to force all the GPIO states w/out going through + * BUG() checks and such. + */ +void bfin_reset_boot_spi_cs(unsigned short pin) +{ + unsigned short gpio = P_IDENT(pin); + port_setup(gpio, GPIO_USAGE); + gpio_array[gpio_bank(gpio)]->data_set = gpio_bit(gpio); + AWA_DUMMY_READ(data_set); + udelay(1); +} + +#ifdef CONFIG_BFIN_GPIO_TRACK +void bfin_gpio_labels(void) +{ + int c, gpio; + + for (c = 0; c < MAX_RESOURCES; c++) { + gpio = is_reserved(gpio, c, 1); + if (!check_gpio(c) && gpio) + printf("GPIO_%d:\t%s\tGPIO %s\n", c, + get_label(c), + get_gpio_dir(c) ? "OUTPUT" : "INPUT"); + else if (is_reserved(peri, c, 1)) + printf("GPIO_%d:\t%s\tPeripheral\n", c, get_label(c)); + else + continue; + } +} +#endif |