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/*
* Copyright (c) 2018 Cypress
* SPDX-License-Identifier: Apache-2.0
*/
/** @file
* @brief UART driver for Cypress PSoC6 MCU family.
*
* Note:
* - Error handling is not implemented.
* - The driver works only in polling mode, interrupt mode is not implemented.
*/
#include <device.h>
#include <errno.h>
#include <init.h>
#include <sys/__assert.h>
#include <soc.h>
#include <drivers/uart.h>
#include "cy_syslib.h"
#include "cy_sysclk.h"
#include "cy_gpio.h"
#include "cy_scb_uart.h"
/*
* Verify Kconfig configuration
*/
struct cypress_psoc6_config {
CySCB_Type *base;
GPIO_PRT_Type *port;
u32_t rx_num;
u32_t tx_num;
en_hsiom_sel_t rx_val;
en_hsiom_sel_t tx_val;
en_clk_dst_t scb_clock;
};
/* Populate configuration structure */
static const cy_stc_scb_uart_config_t uartConfig = {
.uartMode = CY_SCB_UART_STANDARD,
.enableMutliProcessorMode = false,
.smartCardRetryOnNack = false,
.irdaInvertRx = false,
.irdaEnableLowPowerReceiver = false,
.oversample = DT_UART_PSOC6_CONFIG_OVERSAMPLE,
.enableMsbFirst = false,
.dataWidth = DT_UART_PSOC6_CONFIG_DATAWIDTH,
.parity = CY_SCB_UART_PARITY_NONE,
.stopBits = CY_SCB_UART_STOP_BITS_1,
.enableInputFilter = false,
.breakWidth = DT_UART_PSOC6_CONFIG_BREAKWIDTH,
.dropOnFrameError = false,
.dropOnParityError = false,
.receiverAddress = 0UL,
.receiverAddressMask = 0UL,
.acceptAddrInFifo = false,
.enableCts = false,
.ctsPolarity = CY_SCB_UART_ACTIVE_LOW,
.rtsRxFifoLevel = 0UL,
.rtsPolarity = CY_SCB_UART_ACTIVE_LOW,
.rxFifoTriggerLevel = 0UL,
.rxFifoIntEnableMask = 0UL,
.txFifoTriggerLevel = 0UL,
.txFifoIntEnableMask = 0UL,
};
/**
* Function Name: uart_psoc6_init()
*
* Peforms hardware initialization: debug UART.
*
*/
static int uart_psoc6_init(struct device *dev)
{
const struct cypress_psoc6_config *config = dev->config->config_info;
/* Connect SCB5 UART function to pins */
Cy_GPIO_SetHSIOM(config->port, config->rx_num, config->rx_val);
Cy_GPIO_SetHSIOM(config->port, config->tx_num, config->tx_val);
/* Configure pins for UART operation */
Cy_GPIO_SetDrivemode(config->port, config->rx_num, CY_GPIO_DM_HIGHZ);
Cy_GPIO_SetDrivemode(config->port, config->tx_num,
CY_GPIO_DM_STRONG_IN_OFF);
/* Connect assigned divider to be a clock source for UART */
Cy_SysClk_PeriphAssignDivider(config->scb_clock,
DT_UART_PSOC6_UART_CLK_DIV_TYPE,
DT_UART_PSOC6_UART_CLK_DIV_NUMBER);
Cy_SysClk_PeriphSetDivider(DT_UART_PSOC6_UART_CLK_DIV_TYPE,
DT_UART_PSOC6_UART_CLK_DIV_NUMBER,
DT_UART_PSOC6_UART_CLK_DIV_VAL);
Cy_SysClk_PeriphEnableDivider(DT_UART_PSOC6_UART_CLK_DIV_TYPE,
DT_UART_PSOC6_UART_CLK_DIV_NUMBER);
/* Configure UART to operate */
(void) Cy_SCB_UART_Init(config->base, &uartConfig, NULL);
Cy_SCB_UART_Enable(config->base);
return 0;
}
static int uart_psoc6_poll_in(struct device *dev, unsigned char *c)
{
const struct cypress_psoc6_config *config = dev->config->config_info;
u32_t rec;
rec = Cy_SCB_UART_Get(config->base);
*c = (unsigned char)(rec & 0xff);
return ((rec == CY_SCB_UART_RX_NO_DATA) ? -1 : 0);
}
static void uart_psoc6_poll_out(struct device *dev, unsigned char c)
{
const struct cypress_psoc6_config *config = dev->config->config_info;
while (Cy_SCB_UART_Put(config->base, (uint32_t)c) != 1UL) {
}
}
static const struct uart_driver_api uart_psoc6_driver_api = {
.poll_in = uart_psoc6_poll_in,
.poll_out = uart_psoc6_poll_out,
};
#ifdef CONFIG_UART_PSOC6_UART_5
static const struct cypress_psoc6_config cypress_psoc6_uart5_config = {
.base = DT_UART_PSOC6_UART_5_BASE_ADDRESS,
.port = DT_UART_PSOC6_UART_5_PORT,
.rx_num = DT_UART_PSOC6_UART_5_RX_NUM,
.tx_num = DT_UART_PSOC6_UART_5_TX_NUM,
.rx_val = DT_UART_PSOC6_UART_5_RX_VAL,
.tx_val = DT_UART_PSOC6_UART_5_TX_VAL,
.scb_clock = DT_UART_PSOC6_UART_5_CLOCK,
};
DEVICE_AND_API_INIT(uart_5, DT_UART_PSOC6_UART_5_NAME,
uart_psoc6_init, NULL,
&cypress_psoc6_uart5_config,
PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
(void *)&uart_psoc6_driver_api);
#endif /* CONFIG_UART_PSOC6_UART_5 */
#ifdef CONFIG_UART_PSOC6_UART_6
static const struct cypress_psoc6_config cypress_psoc6_uart6_config = {
.base = DT_UART_PSOC6_UART_6_BASE_ADDRESS,
.port = DT_UART_PSOC6_UART_6_PORT,
.rx_num = DT_UART_PSOC6_UART_6_RX_NUM,
.tx_num = DT_UART_PSOC6_UART_6_TX_NUM,
.rx_val = DT_UART_PSOC6_UART_6_RX_VAL,
.tx_val = DT_UART_PSOC6_UART_6_TX_VAL,
.scb_clock = DT_UART_PSOC6_UART_6_CLOCK,
};
DEVICE_AND_API_INIT(uart_6, DT_UART_PSOC6_UART_6_NAME,
uart_psoc6_init, NULL,
&cypress_psoc6_uart6_config,
PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
(void *)&uart_psoc6_driver_api);
#endif /* CONFIG_UART_PSOC6_UART_6 */