/* pinmux_dev_qmsi.c - QMSI pinmux dev driver */ /* * Copyright (c) 2016 Intel Corporation * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include #include #include "qm_pinmux.h" #define MASK_2_BITS 0x3 static int pinmux_dev_set(struct device *dev, uint32_t pin, uint32_t func) { ARG_UNUSED(dev); return qm_pmux_select(pin, func) == 0 ? 0 : -EIO; } static int pinmux_dev_get(struct device *dev, uint32_t pin, uint32_t *func) { ARG_UNUSED(dev); /* * pinmux control registers are 32-bit wide, but each pin requires * 2 bits to set the mode (A, B, C, or D). As such we only get 16 * pins per register. */ uint32_t reg_offset = pin >> 4; /* The pin offset within the register */ uint32_t pin_no = pin % 16; /* * Now figure out what is the full address for the register * we are looking for. */ volatile uint32_t *mux_register = &QM_SCSS_PMUX->pmux_sel[reg_offset]; /* * MASK_2_BITS (the value of which is 3) is used because there are * 2 bits for the mode of each pin. */ uint32_t pin_mask = MASK_2_BITS << (pin_no << 1); uint32_t mode_mask = *mux_register & pin_mask; uint32_t mode = mode_mask >> (pin_no << 1); *func = mode; return 0; } static int pinmux_dev_pullup(struct device *dev, uint32_t pin, uint8_t func) { ARG_UNUSED(dev); return qm_pmux_pullup_en(pin, func) == 0 ? 0 : -EIO; } static int pinmux_dev_input(struct device *dev, uint32_t pin, uint8_t func) { ARG_UNUSED(dev); return qm_pmux_input_en(pin, func) == 0 ? 0 : -EIO; } static struct pinmux_driver_api api_funcs = { .set = pinmux_dev_set, .get = pinmux_dev_get, .pullup = pinmux_dev_pullup, .input = pinmux_dev_input }; static int pinmux_dev_initialize(struct device *port) { return 0; } DEVICE_AND_API_INIT(pmux_dev, CONFIG_PINMUX_DEV_NAME, &pinmux_dev_initialize, NULL, NULL, SECONDARY, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT, &api_funcs);