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/*
* Copyright (c) 2016, 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 <compiler.h>
#include <drivers/pl050.h>
#include <util.h>
#include <io.h>
#define KMI_ICR 0x00
#define KMI_STAT 0x04
#define KMI_DATA 0x08
#define KMI_CLKDIV 0x0c
#define KMI_IR 0x10
#define KMI_ICR_TYPE (1 << 5)
#define KMI_ICR_RXINTERN (1 << 4)
#define KMI_ICR_TXINTERN (1 << 3)
#define KMI_ICR_EN (1 << 2)
#define KMI_ICR_FKMID (1 << 1)
#define KMI_ICR_FKMIC (1 << 0)
#define KMI_STAT_TXEMPTY (1 << 6)
#define KMI_STAT_TXBUSY (1 << 5)
#define KMI_STAT_RXFULL (1 << 4)
#define KMI_STAT_RXBUSY (1 << 3)
#define KMI_STAT_RXPARITY (1 << 2)
#define KMI_STAT_KMIC (1 << 1)
#define KMI_STAT_KMID (1 << 0)
#define KMI_IR_TXINTR (1 << 1)
#define KMI_IR_RXINTR (1 << 0)
static bool pl050_have_rx_data(struct serial_chip *chip)
{
struct pl050_data *pd = container_of(chip, struct pl050_data, chip);
return !!(read8(pd->base + KMI_STAT) & KMI_STAT_RXFULL);
}
static int pl050_getchar(struct serial_chip *chip)
{
struct pl050_data *pd = container_of(chip, struct pl050_data, chip);
while (!pl050_have_rx_data(chip))
;
return read8(pd->base + KMI_DATA);
}
static void pl050_flush(struct serial_chip *chip)
{
struct pl050_data *pd = container_of(chip, struct pl050_data, chip);
while (!(read8(pd->base + KMI_STAT) & KMI_STAT_TXEMPTY))
;
}
static void pl050_putc(struct serial_chip *chip, int ch)
{
struct pl050_data *pd = container_of(chip, struct pl050_data, chip);
pl050_flush(chip);
write8(ch, pd->base + KMI_DATA);
}
static const struct serial_ops pl050_ops = {
.putc = pl050_putc,
.flush = pl050_flush,
.have_rx_data = pl050_have_rx_data,
.getchar = pl050_getchar,
};
void pl050_init(struct pl050_data *pd, vaddr_t base, uint32_t clk)
{
pd->base = base;
pd->chip.ops = &pl050_ops;
write8(KMI_ICR_RXINTERN | KMI_ICR_EN, pd->base + KMI_ICR);
write8(clk, base + KMI_CLKDIV);
}
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