mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-06 11:16:15 +09:00
da34aae5fb
The gpio spec for bf54x and bf60x differ a lot from the old gpio driver for bf5xx. A lot of machine macros are used to accomodate both code in one gpio driver. This patch split the old gpio driver and move new gpio2 support to the generic gpio driver folder. - To enable gpio2 driver, macro CONFIG_ADI_GPIO2 should be defined in the board's config header file. - The gpio2 driver supports bf54x, bf60x and future ADI processors, while the older gpio driver supports bf50x, bf51x, bf52x, bf53x and bf561. - All blackfin specific gpio function names are replaced by the generic gpio APIs. Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
776 lines
18 KiB
C
776 lines
18 KiB
C
/*
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* ADI GPIO1 Abstraction Layer
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* Support BF50x, BF51x, BF52x, BF53x and BF561 only.
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*
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* Copyright 2006-2010 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later
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*/
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#include <common.h>
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#include <asm/errno.h>
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#include <asm/gpio.h>
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#include <asm/portmux.h>
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#if ANOMALY_05000311 || ANOMALY_05000323
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enum {
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AWA_data = SYSCR,
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AWA_data_clear = SYSCR,
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AWA_data_set = SYSCR,
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AWA_toggle = SYSCR,
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AWA_maska = UART_SCR,
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AWA_maska_clear = UART_SCR,
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AWA_maska_set = UART_SCR,
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AWA_maska_toggle = UART_SCR,
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AWA_maskb = UART_GCTL,
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AWA_maskb_clear = UART_GCTL,
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AWA_maskb_set = UART_GCTL,
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AWA_maskb_toggle = UART_GCTL,
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AWA_dir = SPORT1_STAT,
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AWA_polar = SPORT1_STAT,
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AWA_edge = SPORT1_STAT,
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AWA_both = SPORT1_STAT,
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#if ANOMALY_05000311
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AWA_inen = TIMER_ENABLE,
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#elif ANOMALY_05000323
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AWA_inen = DMA1_1_CONFIG,
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#endif
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};
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/* Anomaly Workaround */
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#define AWA_DUMMY_READ(name) bfin_read16(AWA_ ## name)
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#else
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#define AWA_DUMMY_READ(...) do { } while (0)
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#endif
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static struct gpio_port_t * const gpio_array[] = {
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#if defined(BF533_FAMILY)
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(struct gpio_port_t *) FIO_FLAG_D,
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#elif defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x) \
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|| defined(BF538_FAMILY) || defined(CONFIG_BF50x)
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(struct gpio_port_t *) PORTFIO,
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# if !defined(BF538_FAMILY)
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(struct gpio_port_t *) PORTGIO,
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(struct gpio_port_t *) PORTHIO,
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# endif
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#elif defined(BF561_FAMILY)
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(struct gpio_port_t *) FIO0_FLAG_D,
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(struct gpio_port_t *) FIO1_FLAG_D,
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(struct gpio_port_t *) FIO2_FLAG_D,
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#else
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# error no gpio arrays defined
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#endif
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};
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#if defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x) || \
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defined(CONFIG_BF50x)
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static unsigned short * const port_fer[] = {
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(unsigned short *) PORTF_FER,
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(unsigned short *) PORTG_FER,
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(unsigned short *) PORTH_FER,
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};
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# if !defined(BF537_FAMILY)
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static unsigned short * const port_mux[] = {
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(unsigned short *) PORTF_MUX,
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(unsigned short *) PORTG_MUX,
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(unsigned short *) PORTH_MUX,
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};
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static const
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u8 pmux_offset[][16] = {
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# if defined(CONFIG_BF52x)
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{ 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 4, 6, 8, 8, 10, 10 }, /* PORTF */
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{ 0, 0, 0, 0, 0, 2, 2, 4, 4, 6, 8, 10, 10, 10, 12, 12 }, /* PORTG */
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{ 0, 0, 0, 0, 0, 0, 0, 0, 2, 4, 4, 4, 4, 4, 4, 4 }, /* PORTH */
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# elif defined(CONFIG_BF51x)
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{ 0, 2, 2, 2, 2, 2, 2, 4, 6, 6, 6, 8, 8, 8, 8, 10 }, /* PORTF */
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{ 0, 0, 0, 2, 4, 6, 6, 6, 8, 10, 10, 12, 14, 14, 14, 14 }, /* PORTG */
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{ 0, 0, 0, 0, 2, 2, 4, 6, 10, 10, 10, 10, 10, 10, 10, 10 }, /* PORTH */
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# endif
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};
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# endif
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#elif defined(BF538_FAMILY)
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static unsigned short * const port_fer[] = {
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(unsigned short *) PORTCIO_FER,
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(unsigned short *) PORTDIO_FER,
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(unsigned short *) PORTEIO_FER,
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};
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#endif
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#ifdef CONFIG_BFIN_GPIO_TRACK
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#define RESOURCE_LABEL_SIZE 16
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static struct str_ident {
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char name[RESOURCE_LABEL_SIZE];
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} str_ident[MAX_RESOURCES];
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static void gpio_error(unsigned gpio)
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{
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printf("bfin-gpio: GPIO %d wasn't requested!\n", gpio);
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}
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static void set_label(unsigned short ident, const char *label)
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{
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if (label) {
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strncpy(str_ident[ident].name, label,
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RESOURCE_LABEL_SIZE);
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str_ident[ident].name[RESOURCE_LABEL_SIZE - 1] = 0;
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}
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}
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static char *get_label(unsigned short ident)
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{
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return (*str_ident[ident].name ? str_ident[ident].name : "UNKNOWN");
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}
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static int cmp_label(unsigned short ident, const char *label)
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{
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if (label == NULL)
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printf("bfin-gpio: please provide none-null label\n");
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if (label)
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return strcmp(str_ident[ident].name, label);
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else
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return -EINVAL;
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}
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#define map_entry(m, i) reserved_##m##_map[gpio_bank(i)]
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#define is_reserved(m, i, e) (map_entry(m, i) & gpio_bit(i))
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#define reserve(m, i) (map_entry(m, i) |= gpio_bit(i))
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#define unreserve(m, i) (map_entry(m, i) &= ~gpio_bit(i))
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#define DECLARE_RESERVED_MAP(m, c) static unsigned short reserved_##m##_map[c]
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#else
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#define is_reserved(m, i, e) (!(e))
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#define reserve(m, i)
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#define unreserve(m, i)
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#define DECLARE_RESERVED_MAP(m, c)
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#define gpio_error(gpio)
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#define set_label(...)
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#define get_label(...) ""
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#define cmp_label(...) 1
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#endif
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DECLARE_RESERVED_MAP(gpio, GPIO_BANK_NUM);
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DECLARE_RESERVED_MAP(peri, gpio_bank(MAX_RESOURCES));
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inline int check_gpio(unsigned gpio)
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{
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if (gpio >= MAX_BLACKFIN_GPIOS)
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return -EINVAL;
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return 0;
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}
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static void port_setup(unsigned gpio, unsigned short usage)
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{
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#if defined(BF538_FAMILY)
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/*
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* BF538/9 Port C,D and E are special.
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* Inverted PORT_FER polarity on CDE and no PORF_FER on F
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* Regular PORT F GPIOs are handled here, CDE are exclusively
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* managed by GPIOLIB
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*/
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if (gpio < MAX_BLACKFIN_GPIOS || gpio >= MAX_RESOURCES)
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return;
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gpio -= MAX_BLACKFIN_GPIOS;
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if (usage == GPIO_USAGE)
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*port_fer[gpio_bank(gpio)] |= gpio_bit(gpio);
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else
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*port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio);
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SSYNC();
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return;
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#endif
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if (check_gpio(gpio))
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return;
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#if defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x) || \
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defined(CONFIG_BF50x)
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if (usage == GPIO_USAGE)
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*port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio);
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else
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*port_fer[gpio_bank(gpio)] |= gpio_bit(gpio);
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SSYNC();
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#endif
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}
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#ifdef BF537_FAMILY
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static struct {
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unsigned short res;
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unsigned short offset;
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} port_mux_lut[] = {
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{.res = P_PPI0_D13, .offset = 11},
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{.res = P_PPI0_D14, .offset = 11},
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{.res = P_PPI0_D15, .offset = 11},
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{.res = P_SPORT1_TFS, .offset = 11},
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{.res = P_SPORT1_TSCLK, .offset = 11},
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{.res = P_SPORT1_DTPRI, .offset = 11},
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{.res = P_PPI0_D10, .offset = 10},
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{.res = P_PPI0_D11, .offset = 10},
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{.res = P_PPI0_D12, .offset = 10},
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{.res = P_SPORT1_RSCLK, .offset = 10},
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{.res = P_SPORT1_RFS, .offset = 10},
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{.res = P_SPORT1_DRPRI, .offset = 10},
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{.res = P_PPI0_D8, .offset = 9},
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{.res = P_PPI0_D9, .offset = 9},
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{.res = P_SPORT1_DRSEC, .offset = 9},
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{.res = P_SPORT1_DTSEC, .offset = 9},
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{.res = P_TMR2, .offset = 8},
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{.res = P_PPI0_FS3, .offset = 8},
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{.res = P_TMR3, .offset = 7},
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{.res = P_SPI0_SSEL4, .offset = 7},
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{.res = P_TMR4, .offset = 6},
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{.res = P_SPI0_SSEL5, .offset = 6},
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{.res = P_TMR5, .offset = 5},
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{.res = P_SPI0_SSEL6, .offset = 5},
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{.res = P_UART1_RX, .offset = 4},
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{.res = P_UART1_TX, .offset = 4},
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{.res = P_TMR6, .offset = 4},
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{.res = P_TMR7, .offset = 4},
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{.res = P_UART0_RX, .offset = 3},
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{.res = P_UART0_TX, .offset = 3},
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{.res = P_DMAR0, .offset = 3},
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{.res = P_DMAR1, .offset = 3},
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{.res = P_SPORT0_DTSEC, .offset = 1},
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{.res = P_SPORT0_DRSEC, .offset = 1},
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{.res = P_CAN0_RX, .offset = 1},
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{.res = P_CAN0_TX, .offset = 1},
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{.res = P_SPI0_SSEL7, .offset = 1},
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{.res = P_SPORT0_TFS, .offset = 0},
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{.res = P_SPORT0_DTPRI, .offset = 0},
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{.res = P_SPI0_SSEL2, .offset = 0},
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{.res = P_SPI0_SSEL3, .offset = 0},
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};
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static void portmux_setup(unsigned short per)
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{
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u16 y, offset, muxreg;
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u16 function = P_FUNCT2MUX(per);
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for (y = 0; y < ARRAY_SIZE(port_mux_lut); y++) {
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if (port_mux_lut[y].res == per) {
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/* SET PORTMUX REG */
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offset = port_mux_lut[y].offset;
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muxreg = bfin_read_PORT_MUX();
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if (offset != 1)
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muxreg &= ~(1 << offset);
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else
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muxreg &= ~(3 << 1);
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muxreg |= (function << offset);
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bfin_write_PORT_MUX(muxreg);
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}
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}
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}
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#elif defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
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inline void portmux_setup(unsigned short per)
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{
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u16 pmux, ident = P_IDENT(per), function = P_FUNCT2MUX(per);
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u8 offset = pmux_offset[gpio_bank(ident)][gpio_sub_n(ident)];
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pmux = *port_mux[gpio_bank(ident)];
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pmux &= ~(3 << offset);
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pmux |= (function & 3) << offset;
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*port_mux[gpio_bank(ident)] = pmux;
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SSYNC();
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}
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#else
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# define portmux_setup(...) do { } while (0)
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#endif
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/***********************************************************
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*
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* FUNCTIONS: Blackfin General Purpose Ports Access Functions
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*
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* INPUTS/OUTPUTS:
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* gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
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*
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*
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* DESCRIPTION: These functions abstract direct register access
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* to Blackfin processor General Purpose
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* Ports Regsiters
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*
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* CAUTION: These functions do not belong to the GPIO Driver API
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*************************************************************
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* MODIFICATION HISTORY :
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**************************************************************/
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/* Set a specific bit */
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#define SET_GPIO(name) \
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void set_gpio_ ## name(unsigned gpio, unsigned short arg) \
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{ \
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unsigned long flags; \
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local_irq_save(flags); \
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if (arg) \
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gpio_array[gpio_bank(gpio)]->name |= gpio_bit(gpio); \
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else \
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gpio_array[gpio_bank(gpio)]->name &= ~gpio_bit(gpio); \
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AWA_DUMMY_READ(name); \
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local_irq_restore(flags); \
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}
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SET_GPIO(dir) /* set_gpio_dir() */
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SET_GPIO(inen) /* set_gpio_inen() */
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SET_GPIO(polar) /* set_gpio_polar() */
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SET_GPIO(edge) /* set_gpio_edge() */
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SET_GPIO(both) /* set_gpio_both() */
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#define SET_GPIO_SC(name) \
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void set_gpio_ ## name(unsigned gpio, unsigned short arg) \
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{ \
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unsigned long flags; \
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if (ANOMALY_05000311 || ANOMALY_05000323) \
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local_irq_save(flags); \
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if (arg) \
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gpio_array[gpio_bank(gpio)]->name ## _set = gpio_bit(gpio); \
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else \
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gpio_array[gpio_bank(gpio)]->name ## _clear = gpio_bit(gpio); \
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if (ANOMALY_05000311 || ANOMALY_05000323) { \
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AWA_DUMMY_READ(name); \
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local_irq_restore(flags); \
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} \
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}
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SET_GPIO_SC(maska)
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SET_GPIO_SC(maskb)
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SET_GPIO_SC(data)
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void set_gpio_toggle(unsigned gpio)
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{
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unsigned long flags;
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if (ANOMALY_05000311 || ANOMALY_05000323)
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local_irq_save(flags);
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gpio_array[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
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if (ANOMALY_05000311 || ANOMALY_05000323) {
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AWA_DUMMY_READ(toggle);
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local_irq_restore(flags);
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}
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}
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/* Set current PORT date (16-bit word) */
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#define SET_GPIO_P(name) \
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void set_gpiop_ ## name(unsigned gpio, unsigned short arg) \
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{ \
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unsigned long flags; \
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if (ANOMALY_05000311 || ANOMALY_05000323) \
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local_irq_save(flags); \
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gpio_array[gpio_bank(gpio)]->name = arg; \
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if (ANOMALY_05000311 || ANOMALY_05000323) { \
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AWA_DUMMY_READ(name); \
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local_irq_restore(flags); \
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} \
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}
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SET_GPIO_P(data)
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SET_GPIO_P(dir)
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SET_GPIO_P(inen)
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SET_GPIO_P(polar)
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SET_GPIO_P(edge)
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SET_GPIO_P(both)
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SET_GPIO_P(maska)
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SET_GPIO_P(maskb)
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/* Get a specific bit */
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#define GET_GPIO(name) \
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unsigned short get_gpio_ ## name(unsigned gpio) \
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{ \
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unsigned long flags; \
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unsigned short ret; \
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if (ANOMALY_05000311 || ANOMALY_05000323) \
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local_irq_save(flags); \
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ret = 0x01 & (gpio_array[gpio_bank(gpio)]->name >> gpio_sub_n(gpio)); \
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if (ANOMALY_05000311 || ANOMALY_05000323) { \
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AWA_DUMMY_READ(name); \
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local_irq_restore(flags); \
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} \
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return ret; \
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}
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GET_GPIO(data)
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GET_GPIO(dir)
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GET_GPIO(inen)
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GET_GPIO(polar)
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GET_GPIO(edge)
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GET_GPIO(both)
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GET_GPIO(maska)
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GET_GPIO(maskb)
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/* Get current PORT date (16-bit word) */
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#define GET_GPIO_P(name) \
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unsigned short get_gpiop_ ## name(unsigned gpio) \
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{ \
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unsigned long flags; \
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unsigned short ret; \
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if (ANOMALY_05000311 || ANOMALY_05000323) \
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local_irq_save(flags); \
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ret = (gpio_array[gpio_bank(gpio)]->name); \
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if (ANOMALY_05000311 || ANOMALY_05000323) { \
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AWA_DUMMY_READ(name); \
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local_irq_restore(flags); \
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} \
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return ret; \
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}
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GET_GPIO_P(data)
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GET_GPIO_P(dir)
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GET_GPIO_P(inen)
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GET_GPIO_P(polar)
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GET_GPIO_P(edge)
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GET_GPIO_P(both)
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GET_GPIO_P(maska)
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GET_GPIO_P(maskb)
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/***********************************************************
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*
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* FUNCTIONS: Blackfin Peripheral Resource Allocation
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* and PortMux Setup
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*
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* INPUTS/OUTPUTS:
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* per Peripheral Identifier
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* label String
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*
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* DESCRIPTION: Blackfin Peripheral Resource Allocation and Setup API
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*
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* CAUTION:
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*************************************************************
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* MODIFICATION HISTORY :
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**************************************************************/
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int peripheral_request(unsigned short per, const char *label)
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{
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unsigned short ident = P_IDENT(per);
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/*
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* Don't cares are pins with only one dedicated function
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*/
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if (per & P_DONTCARE)
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return 0;
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if (!(per & P_DEFINED))
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return -ENODEV;
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BUG_ON(ident >= MAX_RESOURCES);
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/* If a pin can be muxed as either GPIO or peripheral, make
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* sure it is not already a GPIO pin when we request it.
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*/
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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
|
|
*/
|
|
|
|
if (!(per & P_MAYSHARE)) {
|
|
/*
|
|
* 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 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;
|
|
}
|
|
else { /* Reset POLAR setting when acquiring a gpio for the first time */
|
|
set_gpio_polar(gpio, 0);
|
|
}
|
|
|
|
reserve(gpio, gpio);
|
|
set_label(gpio, label);
|
|
|
|
port_setup(gpio, GPIO_USAGE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gpio_free(unsigned gpio)
|
|
{
|
|
if (check_gpio(gpio) < 0)
|
|
return -1;
|
|
|
|
if (unlikely(!is_reserved(gpio, gpio, 0))) {
|
|
gpio_error(gpio);
|
|
return -1;
|
|
}
|
|
|
|
unreserve(gpio, gpio);
|
|
|
|
set_label(gpio, "free");
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef ADI_SPECIAL_GPIO_BANKS
|
|
DECLARE_RESERVED_MAP(special_gpio, gpio_bank(MAX_RESOURCES));
|
|
|
|
int 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 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 __gpio_direction_input(unsigned gpio)
|
|
{
|
|
gpio_array[gpio_bank(gpio)]->dir &= ~gpio_bit(gpio);
|
|
gpio_array[gpio_bank(gpio)]->inen |= gpio_bit(gpio);
|
|
}
|
|
|
|
int gpio_direction_input(unsigned gpio)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (!is_reserved(gpio, gpio, 0)) {
|
|
gpio_error(gpio);
|
|
return -EINVAL;
|
|
}
|
|
|
|
local_irq_save(flags);
|
|
__gpio_direction_input(gpio);
|
|
AWA_DUMMY_READ(inen);
|
|
local_irq_restore(flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int 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);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int 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);
|
|
gpio_array[gpio_bank(gpio)]->dir |= gpio_bit(gpio);
|
|
|
|
AWA_DUMMY_READ(dir);
|
|
local_irq_restore(flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gpio_get_value(unsigned gpio)
|
|
{
|
|
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);
|
|
}
|
|
|
|
/* 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);
|
|
}
|
|
|
|
void 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;
|
|
}
|
|
}
|