101 lines
2.2 KiB
C
101 lines
2.2 KiB
C
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/*
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* Copyright (c) 2017 Jean-Paul Etienne <fractalclone@gmail.com>
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @brief PINMUX driver for the SiFive Freedom Processor
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*/
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#include <errno.h>
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#include <device.h>
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#include <pinmux.h>
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#include <soc.h>
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struct pinmux_sifive_config {
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u32_t base;
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};
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struct pinmux_sifive_regs_t {
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u32_t iof_en;
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u32_t iof_sel;
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};
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#define DEV_CFG(dev) \
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((const struct pinmux_sifive_config * const) \
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(dev)->config->config_info)
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#define DEV_PINMUX(dev) \
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((struct pinmux_sifive_regs_t *)(DEV_CFG(dev))->base)
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static int pinmux_sifive_set(struct device *dev, u32_t pin, u32_t func)
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{
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volatile struct pinmux_sifive_regs_t *pinmux = DEV_PINMUX(dev);
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if (func > SIFIVE_PINMUX_IOF1 ||
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pin >= SIFIVE_PINMUX_PINS)
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return -EINVAL;
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if (func == SIFIVE_PINMUX_IOF1)
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pinmux->iof_sel |= (SIFIVE_PINMUX_IOF1 << pin);
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else
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pinmux->iof_sel &= ~(SIFIVE_PINMUX_IOF1 << pin);
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/* Enable IO function for this pin */
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pinmux->iof_en |= (1 << pin);
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return 0;
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}
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static int pinmux_sifive_get(struct device *dev, u32_t pin, u32_t *func)
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{
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volatile struct pinmux_sifive_regs_t *pinmux = DEV_PINMUX(dev);
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if (pin >= SIFIVE_PINMUX_PINS ||
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func == NULL)
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return -EINVAL;
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*func = (pinmux->iof_sel & (SIFIVE_PINMUX_IOF1 << pin)) ?
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SIFIVE_PINMUX_IOF1 : SIFIVE_PINMUX_IOF0;
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return 0;
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}
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static int pinmux_sifive_pullup(struct device *dev, u32_t pin, u8_t func)
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{
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return -ENOTSUP;
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}
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static int pinmux_sifive_input(struct device *dev, u32_t pin, u8_t func)
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{
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return -ENOTSUP;
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}
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static int pinmux_sifive_init(struct device *dev)
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{
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volatile struct pinmux_sifive_regs_t *pinmux = DEV_PINMUX(dev);
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/* Ensure that all pins are disabled initially */
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pinmux->iof_en = 0x0;
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return 0;
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}
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static const struct pinmux_driver_api pinmux_sifive_driver_api = {
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.set = pinmux_sifive_set,
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.get = pinmux_sifive_get,
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.pullup = pinmux_sifive_pullup,
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.input = pinmux_sifive_input,
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};
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static const struct pinmux_sifive_config pinmux_sifive_0_config = {
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.base = SIFIVE_PINMUX_0_BASE_ADDR,
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};
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DEVICE_AND_API_INIT(pinmux_sifive_0, CONFIG_PINMUX_SIFIVE_0_NAME,
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&pinmux_sifive_init, NULL,
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&pinmux_sifive_0_config,
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PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
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&pinmux_sifive_driver_api);
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