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u-boot/arch/blackfin/cpu/gpio.c
Mike Frysinger 95b4b9d97a Blackfin: gpio: optimize free path a little 
When we aren't doing resource tracking, the gpio_free() function is a
stub that simply returns, so pull this logic up a level and make it an
inline stub in the header.  Now we don't have to waste time at any of
the call sites.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2011-07-12 02:17:45 -04:00

858 lines
20 KiB
C
Raw Blame History

/*
* 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) || defined(CONFIG_BF50x)
(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) || \
defined(CONFIG_BF50x)
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) || \
defined(CONFIG_BF50x)
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;
}
#ifdef CONFIG_BFIN_GPIO_TRACK
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");
}
#endif
#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
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