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/*
* Copyright (C) 2011-2015 Vladimir Zapolskiy <vz@mleia.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <serial.h>
#include <dm/platform_data/lpc32xx_hsuart.h>
#include <asm/arch/uart.h>
#include <linux/compiler.h>
struct lpc32xx_hsuart_priv {
struct hsuart_regs *hsuart;
};
static int lpc32xx_serial_setbrg(struct udevice *dev, int baudrate)
{
struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
struct hsuart_regs *hsuart = priv->hsuart;
u32 div;
/* UART rate = PERIPH_CLK / ((HSU_RATE + 1) x 14) */
div = (get_serial_clock() / 14 + baudrate / 2) / baudrate - 1;
if (div > 255)
div = 255;
writel(div, &hsuart->rate);
return 0;
}
static int lpc32xx_serial_getc(struct udevice *dev)
{
struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
struct hsuart_regs *hsuart = priv->hsuart;
if (!(readl(&hsuart->level) & HSUART_LEVEL_RX))
return -EAGAIN;
return readl(&hsuart->rx) & HSUART_RX_DATA;
}
static int lpc32xx_serial_putc(struct udevice *dev, const char c)
{
struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
struct hsuart_regs *hsuart = priv->hsuart;
/* Wait for empty FIFO */
if (readl(&hsuart->level) & HSUART_LEVEL_TX)
return -EAGAIN;
writel(c, &hsuart->tx);
return 0;
}
static int lpc32xx_serial_pending(struct udevice *dev, bool input)
{
struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
struct hsuart_regs *hsuart = priv->hsuart;
if (input) {
if (readl(&hsuart->level) & HSUART_LEVEL_RX)
return 1;
} else {
if (readl(&hsuart->level) & HSUART_LEVEL_TX)
return 1;
}
return 0;
}
static int lpc32xx_serial_init(struct hsuart_regs *hsuart)
{
/* Disable hardware RTS and CTS flow control, set up RX and TX FIFO */
writel(HSUART_CTRL_TMO_16 | HSUART_CTRL_HSU_OFFSET(20) |
HSUART_CTRL_HSU_RX_TRIG_32 | HSUART_CTRL_HSU_TX_TRIG_0,
&hsuart->ctrl);
return 0;
}
static int lpc32xx_hsuart_probe(struct udevice *dev)
{
struct lpc32xx_hsuart_platdata *platdata = dev_get_platdata(dev);
struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
priv->hsuart = (struct hsuart_regs *)platdata->base;
lpc32xx_serial_init(priv->hsuart);
return 0;
}
static const struct dm_serial_ops lpc32xx_hsuart_ops = {
.setbrg = lpc32xx_serial_setbrg,
.getc = lpc32xx_serial_getc,
.putc = lpc32xx_serial_putc,
.pending = lpc32xx_serial_pending,
};
U_BOOT_DRIVER(lpc32xx_hsuart) = {
.name = "lpc32xx_hsuart",
.id = UCLASS_SERIAL,
.probe = lpc32xx_hsuart_probe,
.ops = &lpc32xx_hsuart_ops,
.priv_auto_alloc_size = sizeof(struct lpc32xx_hsuart_priv),
.flags = DM_FLAG_PRE_RELOC,
};
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