diff options
Diffstat (limited to 'src/soc/qualcomm/ipq40xx/gpio.c')
| -rw-r--r-- | src/soc/qualcomm/ipq40xx/gpio.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/src/soc/qualcomm/ipq40xx/gpio.c b/src/soc/qualcomm/ipq40xx/gpio.c new file mode 100644 index 0000000000..47c0fcdaa7 --- /dev/null +++ b/src/soc/qualcomm/ipq40xx/gpio.c @@ -0,0 +1,152 @@ +/* + * Copyright (c) 2011-2012, The Linux Foundation. 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 The Linux Foundation 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 "AS IS" AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT + * 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); +} |