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/*
* Copyright (c) 2016, Spreadtrum Communications Inc.
* Copyright (c) 2017, Linaro Limited
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <drivers/sprd_uart.h>
#include <io.h>
#include <keep.h>
#include <util.h>
/* Register definitions */
#define UART_TXD 0x0000
#define UART_RXD 0x0004
#define UART_STS1 0x000C /* data number in TX and RX fifo */
/* Register Bit Fields*/
#define STS1_RXF_CNT_MASK 0x00ff /* Rx FIFO data counter mask */
#define STS1_TXF_CNT_MASK 0xff00 /* Tx FIFO data counter mask */
static vaddr_t chip_to_base(struct serial_chip *chip)
{
struct sprd_uart_data *pd =
container_of(chip, struct sprd_uart_data, chip);
return io_pa_or_va(&pd->base);
}
static void sprd_uart_flush(struct serial_chip *chip)
{
vaddr_t base = chip_to_base(chip);
while (read32(base + UART_STS1) & STS1_TXF_CNT_MASK)
;
}
static bool sprd_uart_have_rx_data(struct serial_chip *chip)
{
vaddr_t base = chip_to_base(chip);
return !!(read32(base + UART_STS1) & STS1_RXF_CNT_MASK);
}
static void sprd_uart_putc(struct serial_chip *chip, int ch)
{
vaddr_t base = chip_to_base(chip);
sprd_uart_flush(chip);
write32(base + UART_TXD, ch);
}
static int sprd_uart_getchar(struct serial_chip *chip)
{
vaddr_t base = chip_to_base(chip);
while (!sprd_uart_have_rx_data(chip))
;
return read32(base + UART_RXD) & 0xff;
}
static const struct serial_ops sprd_uart_ops = {
.flush = sprd_uart_flush,
.getchar = sprd_uart_getchar,
.have_rx_data = sprd_uart_have_rx_data,
.putc = sprd_uart_putc,
};
KEEP_PAGER(sprd_uart_ops);
void sprd_uart_init(struct sprd_uart_data *pd, paddr_t base)
{
pd->base.pa = base;
pd->chip.ops = &sprd_uart_ops;
}
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