/* * NVIDIA Tegra2 GPIO handling. * (C) Copyright 2010-2012 * NVIDIA Corporation <www.nvidia.com> * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ /* * Based on (mostly copied from) kw_gpio.c based Linux 2.6 kernel driver. * Tom Warren (twarren@nvidia.com) */ #include <common.h> #include <asm/io.h> #include <asm/bitops.h> #include <asm/arch/tegra2.h> #include <asm/gpio.h> enum { TEGRA2_CMD_INFO, TEGRA2_CMD_PORT, TEGRA2_CMD_OUTPUT, TEGRA2_CMD_INPUT, }; static struct gpio_names { char name[GPIO_NAME_SIZE]; } gpio_names[MAX_NUM_GPIOS]; static char *get_name(int i) { return *gpio_names[i].name ? gpio_names[i].name : "UNKNOWN"; } /* Return config of pin 'gpio' as GPIO (1) or SFPIO (0) */ static int get_config(unsigned gpio) { struct gpio_ctlr *ctlr = (struct gpio_ctlr *)NV_PA_GPIO_BASE; struct gpio_ctlr_bank *bank = &ctlr->gpio_bank[GPIO_BANK(gpio)]; u32 u; int type; u = readl(&bank->gpio_config[GPIO_PORT(gpio)]); type = (u >> GPIO_BIT(gpio)) & 1; debug("get_config: port = %d, bit = %d is %s\n", GPIO_FULLPORT(gpio), GPIO_BIT(gpio), type ? "GPIO" : "SFPIO"); return type; } /* Config pin 'gpio' as GPIO or SFPIO, based on 'type' */ static void set_config(unsigned gpio, int type) { struct gpio_ctlr *ctlr = (struct gpio_ctlr *)NV_PA_GPIO_BASE; struct gpio_ctlr_bank *bank = &ctlr->gpio_bank[GPIO_BANK(gpio)]; u32 u; debug("set_config: port = %d, bit = %d, %s\n", GPIO_FULLPORT(gpio), GPIO_BIT(gpio), type ? "GPIO" : "SFPIO"); u = readl(&bank->gpio_config[GPIO_PORT(gpio)]); if (type) /* GPIO */ u |= 1 << GPIO_BIT(gpio); else u &= ~(1 << GPIO_BIT(gpio)); writel(u, &bank->gpio_config[GPIO_PORT(gpio)]); } /* Return GPIO pin 'gpio' direction - 0 = input or 1 = output */ static int get_direction(unsigned gpio) { struct gpio_ctlr *ctlr = (struct gpio_ctlr *)NV_PA_GPIO_BASE; struct gpio_ctlr_bank *bank = &ctlr->gpio_bank[GPIO_BANK(gpio)]; u32 u; int dir; u = readl(&bank->gpio_dir_out[GPIO_PORT(gpio)]); dir = (u >> GPIO_BIT(gpio)) & 1; debug("get_direction: port = %d, bit = %d, %s\n", GPIO_FULLPORT(gpio), GPIO_BIT(gpio), dir ? "OUT" : "IN"); return dir; } /* Config GPIO pin 'gpio' as input or output (OE) as per 'output' */ static void set_direction(unsigned gpio, int output) { struct gpio_ctlr *ctlr = (struct gpio_ctlr *)NV_PA_GPIO_BASE; struct gpio_ctlr_bank *bank = &ctlr->gpio_bank[GPIO_BANK(gpio)]; u32 u; debug("set_direction: port = %d, bit = %d, %s\n", GPIO_FULLPORT(gpio), GPIO_BIT(gpio), output ? "OUT" : "IN"); u = readl(&bank->gpio_dir_out[GPIO_PORT(gpio)]); if (output) u |= 1 << GPIO_BIT(gpio); else u &= ~(1 << GPIO_BIT(gpio)); writel(u, &bank->gpio_dir_out[GPIO_PORT(gpio)]); } /* set GPIO pin 'gpio' output bit as 0 or 1 as per 'high' */ static void set_level(unsigned gpio, int high) { struct gpio_ctlr *ctlr = (struct gpio_ctlr *)NV_PA_GPIO_BASE; struct gpio_ctlr_bank *bank = &ctlr->gpio_bank[GPIO_BANK(gpio)]; u32 u; debug("set_level: port = %d, bit %d == %d\n", GPIO_FULLPORT(gpio), GPIO_BIT(gpio), high); u = readl(&bank->gpio_out[GPIO_PORT(gpio)]); if (high) u |= 1 << GPIO_BIT(gpio); else u &= ~(1 << GPIO_BIT(gpio)); writel(u, &bank->gpio_out[GPIO_PORT(gpio)]); } /* * Generic_GPIO primitives. */ int gpio_request(unsigned gpio, const char *label) { if (gpio >= MAX_NUM_GPIOS) return -1; if (label != NULL) { strncpy(gpio_names[gpio].name, label, GPIO_NAME_SIZE); gpio_names[gpio].name[GPIO_NAME_SIZE - 1] = '\0'; } /* Configure as a GPIO */ set_config(gpio, 1); return 0; } int gpio_free(unsigned gpio) { if (gpio >= MAX_NUM_GPIOS) return -1; gpio_names[gpio].name[0] = '\0'; /* Do not configure as input or change pin mux here */ return 0; } /* read GPIO OUT value of pin 'gpio' */ static int gpio_get_output_value(unsigned gpio) { struct gpio_ctlr *ctlr = (struct gpio_ctlr *)NV_PA_GPIO_BASE; struct gpio_ctlr_bank *bank = &ctlr->gpio_bank[GPIO_BANK(gpio)]; int val; debug("gpio_get_output_value: pin = %d (port %d:bit %d)\n", gpio, GPIO_FULLPORT(gpio), GPIO_BIT(gpio)); val = readl(&bank->gpio_out[GPIO_PORT(gpio)]); return (val >> GPIO_BIT(gpio)) & 1; } /* set GPIO pin 'gpio' as an input */ int gpio_direction_input(unsigned gpio) { debug("gpio_direction_input: pin = %d (port %d:bit %d)\n", gpio, GPIO_FULLPORT(gpio), GPIO_BIT(gpio)); /* Configure GPIO direction as input. */ set_direction(gpio, 0); return 0; } /* set GPIO pin 'gpio' as an output, with polarity 'value' */ int gpio_direction_output(unsigned gpio, int value) { debug("gpio_direction_output: pin = %d (port %d:bit %d) = %s\n", gpio, GPIO_FULLPORT(gpio), GPIO_BIT(gpio), value ? "HIGH" : "LOW"); /* Configure GPIO output value. */ set_level(gpio, value); /* Configure GPIO direction as output. */ set_direction(gpio, 1); return 0; } /* read GPIO IN value of pin 'gpio' */ int gpio_get_value(unsigned gpio) { struct gpio_ctlr *ctlr = (struct gpio_ctlr *)NV_PA_GPIO_BASE; struct gpio_ctlr_bank *bank = &ctlr->gpio_bank[GPIO_BANK(gpio)]; int val; debug("gpio_get_value: pin = %d (port %d:bit %d)\n", gpio, GPIO_FULLPORT(gpio), GPIO_BIT(gpio)); val = readl(&bank->gpio_in[GPIO_PORT(gpio)]); return (val >> GPIO_BIT(gpio)) & 1; } /* write GPIO OUT value to pin 'gpio' */ int gpio_set_value(unsigned gpio, int value) { debug("gpio_set_value: pin = %d (port %d:bit %d), value = %d\n", gpio, GPIO_FULLPORT(gpio), GPIO_BIT(gpio), value); /* Configure GPIO output value. */ set_level(gpio, value); return 0; } /* * Display Tegra GPIO information */ void gpio_info(void) { unsigned c; int type; for (c = 0; c < MAX_NUM_GPIOS; c++) { type = get_config(c); /* GPIO, not SFPIO */ if (type) { printf("GPIO_%d:\t%s is an %s, ", c, get_name(c), get_direction(c) ? "OUTPUT" : "INPUT"); if (get_direction(c)) printf("value = %d", gpio_get_output_value(c)); else printf("value = %d", gpio_get_value(c)); printf("\n"); } else continue; } }