u-boot/drivers/gpio/adi_gpio2.c

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/*
* ADI GPIO2 Abstraction Layer
* Support BF54x, BF60x and future processors.
*
* Copyright 2008-2013 Analog Devices Inc.
*
* Licensed under the GPL-2 or later
*/
#include <common.h>
#include <linux/errno.h>
#include <asm/gpio.h>
#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("adi_gpio2: 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("adi_gpio2: 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) unsigned short reserved_##m##_map[c]
static DECLARE_RESERVED_MAP(gpio, GPIO_BANK_NUM);
static 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_GPIOS)
return -EINVAL;
return 0;
}
static void port_setup(unsigned gpio, unsigned short usage)
{
#if 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);
#else
if (usage == GPIO_USAGE)
gpio_array[gpio_bank(gpio)]->port_fer_clear = gpio_bit(gpio);
else
gpio_array[gpio_bank(gpio)]->port_fer_set = gpio_bit(gpio);
#endif
}
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;
}
unsigned short get_gpio_dir(unsigned gpio)
{
return 0x01 &
(gpio_array[gpio_bank(gpio)]->dir_clear >> gpio_sub_n(gpio));
}
/***********************************************************
*
* FUNCTIONS: Peripheral Resource Allocation
* and PortMux Setup
*
* INPUTS/OUTPUTS:
* per Peripheral Identifier
* label String
*
* DESCRIPTION: Peripheral Resource Allocation and Setup API
**************************************************************/
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
*/
if (!((per & P_MAYSHARE) &&
get_portmux(per) == P_FUNCT2MUX(per))) {
/*
* 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: GPIO Driver
*
* INPUTS/OUTPUTS:
* gpio PIO Number between 0 and MAX_GPIOS
* label String
*
* DESCRIPTION: GPIO Driver API
**************************************************************/
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("adi_gpio2: GPIO %d is already reserved by %s!\n",
gpio, get_label(gpio));
return -EBUSY;
}
if (unlikely(is_reserved(peri, gpio, 1))) {
printf("adi_gpio2: GPIO %d is already reserved as Peripheral "
"by %s!\n", gpio, get_label(gpio));
return -EBUSY;
}
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
static 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("adi_gpio2: GPIO %d is already reserved by %s!\n",
gpio, get_label(gpio));
return -EBUSY;
}
if (unlikely(is_reserved(peri, gpio, 1))) {
printf("adi_gpio2: 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;
}
unreserve(special_gpio, gpio);
unreserve(peri, gpio);
set_label(gpio, "free");
}
#endif
static inline void __gpio_direction_input(unsigned gpio)
{
gpio_array[gpio_bank(gpio)]->dir_clear = gpio_bit(gpio);
#if defined(CONFIG_BF54x)
gpio_array[gpio_bank(gpio)]->inen |= gpio_bit(gpio);
#else
gpio_array[gpio_bank(gpio)]->inen_set = gpio_bit(gpio);
#endif
}
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);
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);
#if defined(CONFIG_BF54x)
gpio_array[gpio_bank(gpio)]->inen &= ~gpio_bit(gpio);
#else
gpio_array[gpio_bank(gpio)]->inen_clear = gpio_bit(gpio);
#endif
gpio_set_value(gpio, value);
gpio_array[gpio_bank(gpio)]->dir_set = gpio_bit(gpio);
local_irq_restore(flags);
return 0;
}
int gpio_get_value(unsigned gpio)
{
return 1 & (gpio_array[gpio_bank(gpio)]->data >> gpio_sub_n(gpio));
}
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;
}
}