130 lines
3.0 KiB
C
130 lines
3.0 KiB
C
/*
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* Copyright (c) 2015 Intel Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @file Board config file
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*/
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#include <device.h>
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#include <init.h>
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#include <nanokernel.h>
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#include "soc.h"
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#ifdef CONFIG_UART_K20
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#include <uart.h>
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#include <drivers/k20_pcr.h>
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#include <drivers/k20_sim.h>
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#include <console/uart_console.h>
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#include <serial/uart_k20_priv.h>
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#endif /* CONFIG_UART_K20 */
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/*
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* UART configuration
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*/
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#ifdef CONFIG_UART_K20
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#if defined(CONFIG_UART_CONSOLE) && \
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(defined(CONFIG_PRINTK) || defined(CONFIG_STDOUT_CONSOLE))
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/**
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* @brief Initialize K20 serial port as console
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*
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* Initialize the UART port for console I/O.
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*
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* @param dev The UART device struct
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*
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* @return 0 if successful, otherwise failed.
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*/
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static ALWAYS_INLINE int uart_k20_console_init(void)
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{
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uint32_t port;
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uint32_t rxPin;
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uint32_t txPin;
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union K20_PCR pcr = {0}; /* Pin Control Register */
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/* Port/pin ctrl module */
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volatile struct K20_PORT_PCR *port_pcr_p =
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(volatile struct K20_PORT_PCR *)PERIPH_ADDR_BASE_PCR;
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/* UART0 Rx and Tx pin assignments */
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port = CONFIG_UART_CONSOLE_PORT;
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rxPin = CONFIG_UART_CONSOLE_PORT_RX_PIN;
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txPin = CONFIG_UART_CONSOLE_PORT_TX_PIN;
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/* Enable the UART Rx and Tx Pins */
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pcr.field.mux = CONFIG_UART_CONSOLE_PORT_MUX_FUNC;
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port_pcr_p->port[port].pcr[rxPin] = pcr;
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port_pcr_p->port[port].pcr[txPin] = pcr;
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return 0;
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}
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#else
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#define uart_k20_console_init(...)
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#endif /* CONFIG_UART_CONSOLE && (CONFIG_PRINTK || CONFIG_STDOUT_CONSOLE) */
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static int uart_k20_init(struct device *dev)
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{
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volatile struct K20_SIM *sim = /* sys integ. ctl */
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(volatile struct K20_SIM *)PERIPH_ADDR_BASE_SIM;
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SIM_SCGC4_t scgc4;
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ARG_UNUSED(dev);
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/* Although it is possible to modify the bits through
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* *sim directly, the following code saves about 20 bytes
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* of ROM space, compared to direct modification.
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*/
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scgc4.value = sim->scgc4.value;
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#ifdef CONFIG_UART_K20_PORT_0
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scgc4.field.uart0_clk_en = 1;
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#endif
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#ifdef CONFIG_UART_K20_PORT_1
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scgc4.field.uart1_clk_en = 1;
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#endif
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#ifdef CONFIG_UART_K20_PORT_2
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scgc4.field.uart2_clk_en = 1;
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#endif
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#ifdef CONFIG_UART_K20_PORT_3
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scgc4.field.uart3_clk_en = 1;
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#endif
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sim->scgc4.value = scgc4.value;
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#ifdef CONFIG_UART_K20_PORT_4
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sim->scgc1.field.uart4_clk_en = 1;
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#endif
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/* Initialize UART port for console if needed */
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uart_k20_console_init();
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return 0;
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}
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DEVICE_INIT(_uart_k20_init, "", uart_k20_init,
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NULL, NULL,
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PRIMARY, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
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#endif /* CONFIG_UART_K20 */
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