424 lines
8.7 KiB
C
424 lines
8.7 KiB
C
/*
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* ADI GPIO2 Abstraction Layer
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* Support BF54x, BF60x and future processors.
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*
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* Copyright 2008-2013 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 <linux/errno.h>
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#include <asm/gpio.h>
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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("adi_gpio2: 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("adi_gpio2: 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) unsigned short reserved_##m##_map[c]
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static DECLARE_RESERVED_MAP(gpio, GPIO_BANK_NUM);
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static 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 defined(CONFIG_BF54x)
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if (gpio == GPIO_PB15 || gpio == GPIO_PC14 || gpio == GPIO_PC15 ||
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gpio == GPIO_PH14 || gpio == GPIO_PH15 ||
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gpio == GPIO_PJ14 || gpio == GPIO_PJ15)
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return -EINVAL;
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#endif
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if (gpio >= MAX_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(CONFIG_BF54x)
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if (usage == GPIO_USAGE)
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gpio_array[gpio_bank(gpio)]->port_fer &= ~gpio_bit(gpio);
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else
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gpio_array[gpio_bank(gpio)]->port_fer |= gpio_bit(gpio);
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#else
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if (usage == GPIO_USAGE)
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gpio_array[gpio_bank(gpio)]->port_fer_clear = gpio_bit(gpio);
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else
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gpio_array[gpio_bank(gpio)]->port_fer_set = gpio_bit(gpio);
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#endif
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}
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inline void portmux_setup(unsigned short per)
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{
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u32 pmux;
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u16 ident = P_IDENT(per);
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u16 function = P_FUNCT2MUX(per);
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pmux = gpio_array[gpio_bank(ident)]->port_mux;
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pmux &= ~(0x3 << (2 * gpio_sub_n(ident)));
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pmux |= (function & 0x3) << (2 * gpio_sub_n(ident));
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gpio_array[gpio_bank(ident)]->port_mux = pmux;
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}
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inline u16 get_portmux(unsigned short per)
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{
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u32 pmux;
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u16 ident = P_IDENT(per);
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pmux = gpio_array[gpio_bank(ident)]->port_mux;
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return pmux >> (2 * gpio_sub_n(ident)) & 0x3;
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}
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unsigned short get_gpio_dir(unsigned gpio)
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{
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return 0x01 &
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(gpio_array[gpio_bank(gpio)]->dir_clear >> gpio_sub_n(gpio));
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}
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/***********************************************************
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*
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* FUNCTIONS: 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: Peripheral Resource Allocation and Setup API
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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))) {
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printf("%s: Peripheral %d is already reserved as GPIO by %s!\n",
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__func__, ident, get_label(ident));
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return -EBUSY;
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}
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if (unlikely(is_reserved(peri, ident, 1))) {
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/*
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* Pin functions like AMC address strobes my
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* be requested and used by several drivers
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*/
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if (!((per & P_MAYSHARE) &&
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get_portmux(per) == P_FUNCT2MUX(per))) {
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/*
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* Allow that the identical pin function can
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* be requested from the same driver twice
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*/
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if (cmp_label(ident, label) == 0)
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goto anyway;
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printf("%s: Peripheral %d function %d is already "
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"reserved by %s!\n", __func__, ident,
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P_FUNCT2MUX(per), get_label(ident));
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return -EBUSY;
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}
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}
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anyway:
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reserve(peri, ident);
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portmux_setup(per);
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port_setup(ident, PERIPHERAL_USAGE);
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set_label(ident, label);
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return 0;
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}
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int peripheral_request_list(const unsigned short per[], const char *label)
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{
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u16 cnt;
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int ret;
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for (cnt = 0; per[cnt] != 0; cnt++) {
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ret = peripheral_request(per[cnt], label);
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if (ret < 0) {
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for (; cnt > 0; cnt--)
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peripheral_free(per[cnt - 1]);
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return ret;
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}
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}
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return 0;
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}
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void peripheral_free(unsigned short per)
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{
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unsigned short ident = P_IDENT(per);
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if (per & P_DONTCARE)
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return;
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if (!(per & P_DEFINED))
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return;
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if (unlikely(!is_reserved(peri, ident, 0)))
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return;
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if (!(per & P_MAYSHARE))
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port_setup(ident, GPIO_USAGE);
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unreserve(peri, ident);
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set_label(ident, "free");
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}
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void peripheral_free_list(const unsigned short per[])
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{
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u16 cnt;
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for (cnt = 0; per[cnt] != 0; cnt++)
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peripheral_free(per[cnt]);
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}
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/***********************************************************
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*
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* FUNCTIONS: GPIO Driver
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*
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* INPUTS/OUTPUTS:
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* gpio PIO Number between 0 and MAX_GPIOS
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* label String
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*
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* DESCRIPTION: GPIO Driver API
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**************************************************************/
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int gpio_request(unsigned gpio, const char *label)
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{
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if (check_gpio(gpio) < 0)
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return -EINVAL;
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/*
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* Allow that the identical GPIO can
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* be requested from the same driver twice
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* Do nothing and return -
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*/
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if (cmp_label(gpio, label) == 0)
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return 0;
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if (unlikely(is_reserved(gpio, gpio, 1))) {
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printf("adi_gpio2: GPIO %d is already reserved by %s!\n",
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gpio, get_label(gpio));
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return -EBUSY;
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}
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if (unlikely(is_reserved(peri, gpio, 1))) {
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printf("adi_gpio2: GPIO %d is already reserved as Peripheral "
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"by %s!\n", gpio, get_label(gpio));
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return -EBUSY;
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}
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reserve(gpio, gpio);
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set_label(gpio, label);
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port_setup(gpio, GPIO_USAGE);
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return 0;
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}
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int gpio_free(unsigned gpio)
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{
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if (check_gpio(gpio) < 0)
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return -1;
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if (unlikely(!is_reserved(gpio, gpio, 0))) {
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gpio_error(gpio);
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return -1;
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}
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unreserve(gpio, gpio);
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set_label(gpio, "free");
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return 0;
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}
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#ifdef ADI_SPECIAL_GPIO_BANKS
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static DECLARE_RESERVED_MAP(special_gpio, gpio_bank(MAX_RESOURCES));
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int special_gpio_request(unsigned gpio, const char *label)
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{
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/*
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* Allow that the identical GPIO can
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* be requested from the same driver twice
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* Do nothing and return -
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*/
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if (cmp_label(gpio, label) == 0)
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return 0;
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if (unlikely(is_reserved(special_gpio, gpio, 1))) {
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printf("adi_gpio2: GPIO %d is already reserved by %s!\n",
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gpio, get_label(gpio));
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return -EBUSY;
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}
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if (unlikely(is_reserved(peri, gpio, 1))) {
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printf("adi_gpio2: GPIO %d is already reserved as Peripheral "
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"by %s!\n", gpio, get_label(gpio));
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return -EBUSY;
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}
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reserve(special_gpio, gpio);
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reserve(peri, gpio);
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set_label(gpio, label);
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port_setup(gpio, GPIO_USAGE);
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return 0;
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}
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void special_gpio_free(unsigned gpio)
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{
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if (unlikely(!is_reserved(special_gpio, gpio, 0))) {
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gpio_error(gpio);
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return;
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}
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unreserve(special_gpio, gpio);
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unreserve(peri, gpio);
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set_label(gpio, "free");
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}
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#endif
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static inline void __gpio_direction_input(unsigned gpio)
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{
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gpio_array[gpio_bank(gpio)]->dir_clear = gpio_bit(gpio);
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#if defined(CONFIG_BF54x)
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gpio_array[gpio_bank(gpio)]->inen |= gpio_bit(gpio);
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#else
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gpio_array[gpio_bank(gpio)]->inen_set = gpio_bit(gpio);
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#endif
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}
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int gpio_direction_input(unsigned gpio)
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{
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unsigned long flags;
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if (!is_reserved(gpio, gpio, 0)) {
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gpio_error(gpio);
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return -EINVAL;
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}
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local_irq_save(flags);
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__gpio_direction_input(gpio);
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local_irq_restore(flags);
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return 0;
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}
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int gpio_set_value(unsigned gpio, int arg)
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{
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if (arg)
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gpio_array[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
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else
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gpio_array[gpio_bank(gpio)]->data_clear = gpio_bit(gpio);
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return 0;
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}
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int gpio_direction_output(unsigned gpio, int value)
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{
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unsigned long flags;
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if (!is_reserved(gpio, gpio, 0)) {
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gpio_error(gpio);
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return -EINVAL;
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}
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local_irq_save(flags);
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#if defined(CONFIG_BF54x)
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gpio_array[gpio_bank(gpio)]->inen &= ~gpio_bit(gpio);
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#else
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gpio_array[gpio_bank(gpio)]->inen_clear = gpio_bit(gpio);
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#endif
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gpio_set_value(gpio, value);
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gpio_array[gpio_bank(gpio)]->dir_set = gpio_bit(gpio);
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local_irq_restore(flags);
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return 0;
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}
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int gpio_get_value(unsigned gpio)
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{
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return 1 & (gpio_array[gpio_bank(gpio)]->data >> gpio_sub_n(gpio));
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}
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void gpio_labels(void)
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{
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int c, gpio;
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for (c = 0; c < MAX_RESOURCES; c++) {
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gpio = is_reserved(gpio, c, 1);
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if (!check_gpio(c) && gpio)
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printf("GPIO_%d:\t%s\tGPIO %s\n", c, get_label(c),
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get_gpio_dir(c) ? "OUTPUT" : "INPUT");
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else if (is_reserved(peri, c, 1))
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printf("GPIO_%d:\t%s\tPeripheral\n", c, get_label(c));
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else
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continue;
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}
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}
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