+++ /dev/null
-/*
- * 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 <malloc.h>
-#include <linux/bug.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 -EINVAL;
-
- 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;
- }
-}
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