| /* |
| * Copyright (c) 2011-2012, Code Aurora Forum. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google, Inc. nor the names of its contributors |
| * may be used to endorse or promote products derived from this |
| * software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #include <arch/io.h> |
| #include <gpio.h> |
| #include <soc/iomap.h> |
| |
| /******************************************************* |
| Function description: check for invalid GPIO # |
| Arguments : |
| gpio_t gpio - Gpio number |
| |
| Return : GPIO Valid(0)/Invalid(1) |
| *******************************************************/ |
| |
| static inline int gpio_not_valid(gpio_t gpio) |
| { |
| return (gpio > GPIO_MAX_NUM); |
| } |
| |
| |
| /******************************************************* |
| Function description: configure GPIO functinality |
| Arguments : |
| gpio_t gpio - Gpio number |
| unsigned func - Functionality number |
| unsigned pull - pull up/down, no pull range(0-3) |
| unsigned drvstr - range (0 - 7)-> (2- 16)MA steps of 2 |
| unsigned enable - 0 Disable, 1 - Enable. |
| |
| Return : None |
| *******************************************************/ |
| |
| |
| void gpio_tlmm_config_set(gpio_t gpio, unsigned func, |
| unsigned pull, unsigned drvstr, |
| unsigned enable) |
| { |
| unsigned val = 0; |
| |
| if (gpio_not_valid(gpio)) |
| return; |
| |
| val |= (pull & GPIO_CFG_PULL_MASK) << GPIO_CFG_PULL_SHIFT; |
| val |= (func & GPIO_CFG_FUNC_MASK) << GPIO_CFG_FUNC_SHIFT; |
| val |= (drvstr & GPIO_CFG_DRV_MASK) << GPIO_CFG_DRV_SHIFT; |
| val |= (enable & GPIO_CFG_OE_MASK) << GPIO_CFG_OE_SHIFT; |
| |
| write32(GPIO_CONFIG_ADDR(gpio), val); |
| } |
| |
| /******************************************************* |
| Function description: Get GPIO configuration |
| Arguments : |
| gpio_t gpio - Gpio number |
| unsigned *func - Functionality number |
| unsigned *pull - pull up/down, no pull range(0-3) |
| unsigned *drvstr - range (0 - 7)-> (2- 16)MA steps of 2 |
| unsigned *enable - 0 - Disable, 1- Enable. |
| |
| Return : None |
| *******************************************************/ |
| |
| |
| void gpio_tlmm_config_get(gpio_t gpio, unsigned *func, |
| unsigned *pull, unsigned *drvstr, |
| unsigned *enable) |
| { |
| unsigned val; |
| void *addr = GPIO_CONFIG_ADDR(gpio); |
| |
| if (gpio_not_valid(gpio)) |
| return; |
| |
| val = read32(addr); |
| |
| *pull = (val >> GPIO_CFG_PULL_SHIFT) & GPIO_CFG_PULL_MASK; |
| *func = (val >> GPIO_CFG_FUNC_SHIFT) & GPIO_CFG_FUNC_MASK; |
| *drvstr = (val >> GPIO_CFG_DRV_SHIFT) & GPIO_CFG_DRV_MASK; |
| *enable = (val >> GPIO_CFG_OE_SHIFT) & GPIO_CFG_OE_MASK; |
| } |
| |
| /******************************************************* |
| Function description: get GPIO IO functinality details |
| Arguments : |
| gpio_t gpio - Gpio number |
| unsigned *in - Value of GPIO input |
| unsigned *out - Value of GPIO output |
| |
| Return : None |
| *******************************************************/ |
| int gpio_get(gpio_t gpio) |
| { |
| if (gpio_not_valid(gpio)) |
| return -1; |
| |
| |
| return (read32(GPIO_IN_OUT_ADDR(gpio)) >> GPIO_IO_IN_SHIFT) & |
| GPIO_IO_IN_MASK; |
| } |
| |
| void gpio_set(gpio_t gpio, int value) |
| { |
| if (gpio_not_valid(gpio)) |
| return; |
| |
| write32(GPIO_IN_OUT_ADDR(gpio), (value & 1) << GPIO_IO_OUT_SHIFT); |
| } |
| |
| void gpio_input_pulldown(gpio_t gpio) |
| { |
| gpio_tlmm_config_set(gpio, GPIO_FUNC_DISABLE, |
| GPIO_PULL_DOWN, GPIO_2MA, GPIO_DISABLE); |
| } |
| |
| void gpio_input_pullup(gpio_t gpio) |
| { |
| gpio_tlmm_config_set(gpio, GPIO_FUNC_DISABLE, |
| GPIO_PULL_UP, GPIO_2MA, GPIO_DISABLE); |
| } |
| |
| void gpio_input(gpio_t gpio) |
| { |
| gpio_tlmm_config_set(gpio, GPIO_FUNC_DISABLE, |
| GPIO_NO_PULL, GPIO_2MA, GPIO_DISABLE); |
| } |
| |