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* Copyright (c) 2016, Texas Instruments Incorporated
*
* 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.
*/
/* See www.ti.com/lit/pdf/swru367, section 6, for CC3200 UART info. */
#include <nanokernel.h>
#include <arch/cpu.h>
#include <uart.h>
/* Driverlib includes */
#include <inc/hw_types.h>
#include <inc/hw_memmap.h>
#include <inc/hw_ints.h>
#include <driverlib/rom.h>
#include <driverlib/rom_map.h>
#include <driverlib/prcm.h>
#include <driverlib/uart.h>
/* Note: Zephyr uses exception numbers, vs the IRQ #s used by the CC3200 SDK */
#define EXCEPTION_UARTA0 5 /* (INT_UARTA0 - 16) = (21-16) */
struct uart_cc32xx_dev_data_t {
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
uart_irq_callback_t cb; /**< Callback function pointer */
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
};
#define DEV_CFG(dev) \
((const struct uart_device_config * const)(dev)->config->config_info)
#define DEV_DATA(dev) \
((struct uart_cc32xx_dev_data_t * const)(dev)->driver_data)
/* Forward decls: */
static struct device DEVICE_NAME_GET(uart_cc32xx_0);
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
static void uart_cc32xx_isr(void *arg);
#endif
static const struct uart_device_config uart_cc32xx_dev_cfg_0 = {
.base = (void *)UARTA0_BASE,
.sys_clk_freq = CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC,
};
static struct uart_cc32xx_dev_data_t uart_cc32xx_dev_data_0 = {
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
.cb = NULL,
#endif
};
/*
* CC32XX UART has a configurable FIFO length, from 1 to 8 characters.
* However, the Zephyr console driver, and the Zephyr uart sample test, assume
* a RX FIFO depth of one: meaning, one interrupt == one character received.
* Keeping with this assumption, this driver leaves the FIFOs disabled,
* and at depth 1.
*/
static int uart_cc32xx_init(struct device *dev)
{
const struct uart_device_config *config = DEV_CFG(dev);
MAP_PRCMPeripheralReset(PRCM_UARTA0);
/* This also calls MAP_UARTEnable() to enable the FIFOs: */
MAP_UARTConfigSetExpClk((unsigned long)config->base,
MAP_PRCMPeripheralClockGet(PRCM_UARTA0),
CONFIG_UART_CC32XX_BAUDRATE,
(UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE
| UART_CONFIG_PAR_NONE));
MAP_UARTFlowControlSet((unsigned long)config->base,
UART_FLOWCONTROL_NONE);
/* Re-disable the FIFOs: */
MAP_UARTFIFODisable((unsigned long)config->base);
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
/* Clear any pending UART interrupts: we only care about RX, TX: */
MAP_UARTIntClear((unsigned long)config->base,
(UART_INT_RX | UART_INT_TX));
IRQ_CONNECT(EXCEPTION_UARTA0,
CONFIG_UART_CC32XX_IRQ_PRI,
uart_cc32xx_isr, DEVICE_GET(uart_cc32xx_0),
0);
irq_enable(EXCEPTION_UARTA0);
#endif
return 0;
}
static int uart_cc32xx_poll_in(struct device *dev, unsigned char *c)
{
const struct uart_device_config *config = DEV_CFG(dev);
if (MAP_UARTCharsAvail((unsigned long)config->base)) {
*c = MAP_UARTCharGetNonBlocking((unsigned long)config->base);
} else {
return (-1);
}
return 0;
}
static unsigned char uart_cc32xx_poll_out(struct device *dev, unsigned char c)
{
const struct uart_device_config *config = DEV_CFG(dev);
MAP_UARTCharPut((unsigned long)config->base, c);
return c;
}
static int uart_cc32xx_err_check(struct device *dev)
{
const struct uart_device_config *config = DEV_CFG(dev);
unsigned long cc32xx_errs = 0L;
unsigned int z_err = 0;
cc32xx_errs = MAP_UARTRxErrorGet((unsigned long)config->base);
/* Map cc3200 SDK uart.h defines to zephyr uart.h defines */
z_err = ((cc32xx_errs & UART_RXERROR_OVERRUN) ?
UART_ERROR_OVERRUN : 0) |
((cc32xx_errs & UART_RXERROR_BREAK) ? UART_ERROR_BREAK : 0) |
((cc32xx_errs & UART_RXERROR_PARITY) ? UART_ERROR_PARITY : 0) |
((cc32xx_errs & UART_RXERROR_FRAMING) ? UART_ERROR_FRAMING : 0);
MAP_UARTRxErrorClear((unsigned long)config->base);
return (int)z_err;
}
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
static int uart_cc32xx_fifo_fill(struct device *dev, const uint8_t *tx_data,
int size)
{
const struct uart_device_config *config = DEV_CFG(dev);
unsigned int num_tx = 0;
while ((size - num_tx) > 0) {
/* Send a character */
if (MAP_UARTCharPutNonBlocking((unsigned long)config->base,
tx_data[num_tx])) {
num_tx++;
} else {
break;
}
}
return (int)num_tx;
}
static int uart_cc32xx_fifo_read(struct device *dev, uint8_t *rx_data,
const int size)
{
const struct uart_device_config *config = DEV_CFG(dev);
unsigned int num_rx = 0;
while (((size - num_rx) > 0) &&
MAP_UARTCharsAvail((unsigned long)config->base)) {
/* Receive a character */
rx_data[num_rx++] =
MAP_UARTCharGetNonBlocking((unsigned long)config->base);
}
return num_rx;
}
static void uart_cc32xx_irq_tx_enable(struct device *dev)
{
const struct uart_device_config *config = DEV_CFG(dev);
MAP_UARTIntEnable((unsigned long)config->base, UART_INT_TX);
}
static void uart_cc32xx_irq_tx_disable(struct device *dev)
{
const struct uart_device_config *config = DEV_CFG(dev);
MAP_UARTIntDisable((unsigned long)config->base, UART_INT_TX);
}
static int uart_cc32xx_irq_tx_ready(struct device *dev)
{
const struct uart_device_config *config = DEV_CFG(dev);
unsigned int int_status;
int_status = MAP_UARTIntStatus((unsigned long)config->base, 1);
return (int_status & UART_INT_TX);
}
static void uart_cc32xx_irq_rx_enable(struct device *dev)
{
const struct uart_device_config *config = DEV_CFG(dev);
/* FIFOs are left disabled from reset, so UART_INT_RT flag not used. */
MAP_UARTIntEnable((unsigned long)config->base, UART_INT_RX);
}
static void uart_cc32xx_irq_rx_disable(struct device *dev)
{
const struct uart_device_config *config = DEV_CFG(dev);
MAP_UARTIntDisable((unsigned long)config->base, UART_INT_RX);
}
static int uart_cc32xx_irq_tx_empty(struct device *dev)
{
const struct uart_device_config *config = DEV_CFG(dev);
return (!MAP_UARTBusy((unsigned long)config->base));
}
static int uart_cc32xx_irq_rx_ready(struct device *dev)
{
const struct uart_device_config *config = DEV_CFG(dev);
unsigned int int_status;
int_status = MAP_UARTIntStatus((unsigned long)config->base, 1);
return (int_status & UART_INT_RX);
}
static void uart_cc32xx_irq_err_enable(struct device *dev)
{
/* Not yet used in zephyr */
}
static void uart_cc32xx_irq_err_disable(struct device *dev)
{
/* Not yet used in zephyr */
}
static int uart_cc32xx_irq_is_pending(struct device *dev)
{
const struct uart_device_config *config = DEV_CFG(dev);
unsigned int int_status;
int_status = MAP_UARTIntStatus((unsigned long)config->base, 1);
return (int_status & (UART_INT_TX | UART_INT_RX));
}
static int uart_cc32xx_irq_update(struct device *dev)
{
return 1;
}
static void uart_cc32xx_irq_callback_set(struct device *dev,
uart_irq_callback_t cb)
{
struct uart_cc32xx_dev_data_t * const dev_data = DEV_DATA(dev);
dev_data->cb = cb;
}
/**
* @brief Interrupt service routine.
*
* This simply calls the callback function, if one exists.
*
* Note: CC32XX UART Tx interrupts when ready to send; Rx interrupts when char
* received.
*
* @param arg Argument to ISR.
*
* @return N/A
*/
static void uart_cc32xx_isr(void *arg)
{
struct device *dev = arg;
const struct uart_device_config *config = DEV_CFG(dev);
struct uart_cc32xx_dev_data_t * const dev_data = DEV_DATA(dev);
unsigned long intStatus = MAP_UARTIntStatus((unsigned long)config->base,
1);
if (dev_data->cb) {
dev_data->cb(dev);
}
/*
* Clear interrupts only after cb called, as Zephyr UART clients expect
* to check interrupt status during the callback.
*/
MAP_UARTIntClear((unsigned long)config->base, intStatus);
}
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
static const struct uart_driver_api uart_cc32xx_driver_api = {
.poll_in = uart_cc32xx_poll_in,
.poll_out = uart_cc32xx_poll_out,
.err_check = uart_cc32xx_err_check,
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
.fifo_fill = uart_cc32xx_fifo_fill,
.fifo_read = uart_cc32xx_fifo_read,
.irq_tx_enable = uart_cc32xx_irq_tx_enable,
.irq_tx_disable = uart_cc32xx_irq_tx_disable,
.irq_tx_ready = uart_cc32xx_irq_tx_ready,
.irq_rx_enable = uart_cc32xx_irq_rx_enable,
.irq_rx_disable = uart_cc32xx_irq_rx_disable,
.irq_tx_empty = uart_cc32xx_irq_tx_empty,
.irq_rx_ready = uart_cc32xx_irq_rx_ready,
.irq_err_enable = uart_cc32xx_irq_err_enable,
.irq_err_disable = uart_cc32xx_irq_err_disable,
.irq_is_pending = uart_cc32xx_irq_is_pending,
.irq_update = uart_cc32xx_irq_update,
.irq_callback_set = uart_cc32xx_irq_callback_set,
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
};
DEVICE_AND_API_INIT(uart_cc32xx_0, CONFIG_UART_CONSOLE_ON_DEV_NAME,
uart_cc32xx_init, &uart_cc32xx_dev_data_0,
&uart_cc32xx_dev_cfg_0,
POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
(void *)&uart_cc32xx_driver_api);
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