arch/arm/soc/nxp_kinetis/k6x/soc_config.c

/*
 * Copyright (c) 2015 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.
 */

/**
 * @file Board config file
 */

#include <device.h>
#include <init.h>

#include <nanokernel.h>

#include "soc.h"

#ifdef CONFIG_UART_K20
#include <uart.h>
#include <drivers/k20_pcr.h>
#include <drivers/k20_sim.h>
#include <console/uart_console.h>
#include <serial/uart_k20_priv.h>
#endif /* CONFIG_UART_K20 */

/*
 * UART configuration
 */

#ifdef CONFIG_UART_K20

#if defined(CONFIG_UART_CONSOLE) && \
	(defined(CONFIG_PRINTK) || defined(CONFIG_STDOUT_CONSOLE))

/**
 * @brief Initialize K20 serial port as console
 *
 * Initialize the UART port for console I/O.
 *
 * @param dev The UART device struct
 *
 * @return 0 if successful, otherwise failed.
 */
static ALWAYS_INLINE int uart_k20_console_init(void)
{
	uint32_t port;
	uint32_t rxPin;
	uint32_t txPin;
	union K20_PCR pcr = {0}; /* Pin Control Register */

	/* Port/pin ctrl module */
	volatile struct K20_PORT_PCR *port_pcr_p =
		(volatile struct K20_PORT_PCR *)PERIPH_ADDR_BASE_PCR;

	/* UART0 Rx and Tx pin assignments */
	port = CONFIG_UART_CONSOLE_PORT;
	rxPin = CONFIG_UART_CONSOLE_PORT_RX_PIN;
	txPin = CONFIG_UART_CONSOLE_PORT_TX_PIN;

	/* Enable the UART Rx and Tx Pins */
	pcr.field.mux = CONFIG_UART_CONSOLE_PORT_MUX_FUNC;

	port_pcr_p->port[port].pcr[rxPin] = pcr;
	port_pcr_p->port[port].pcr[txPin] = pcr;

	return 0;
}

#else
#define uart_k20_console_init(...)
#endif /* CONFIG_UART_CONSOLE && (CONFIG_PRINTK || CONFIG_STDOUT_CONSOLE) */

static int uart_k20_init(struct device *dev)
{
	volatile struct K20_SIM *sim = /* sys integ. ctl */
		(volatile struct K20_SIM *)PERIPH_ADDR_BASE_SIM;
	SIM_SCGC4_t scgc4;

	ARG_UNUSED(dev);

	/* Although it is possible to modify the bits through
	 * *sim directly, the following code saves about 20 bytes
	 * of ROM space, compared to direct modification.
	 */
	scgc4.value = sim->scgc4.value;

#ifdef CONFIG_UART_K20_PORT_0
	scgc4.field.uart0_clk_en = 1;
#endif

#ifdef CONFIG_UART_K20_PORT_1
	scgc4.field.uart1_clk_en = 1;
#endif

#ifdef CONFIG_UART_K20_PORT_2
	scgc4.field.uart2_clk_en = 1;
#endif

#ifdef CONFIG_UART_K20_PORT_3
	scgc4.field.uart3_clk_en = 1;
#endif

	sim->scgc4.value = scgc4.value;

#ifdef CONFIG_UART_K20_PORT_4
	sim->scgc1.field.uart4_clk_en = 1;
#endif

	/* Initialize UART port for console if needed */
	uart_k20_console_init();

	return 0;
}

DEVICE_INIT(_uart_k20_init, "", uart_k20_init,
				NULL, NULL,
				PRIMARY, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);

#endif /* CONFIG_UART_K20 */