mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-18 09:13:06 +00:00
d1998a9fde
This name is far too long. Rename it to remove the 'data' bits. This makes it consistent with the platdata->plat rename. Signed-off-by: Simon Glass <sjg@chromium.org>
165 lines
4 KiB
C
165 lines
4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* (C) Copyright 2020 Cortina-Access Ltd.
|
|
* Common UART Driver for Cortina Access CAxxxx line of SoCs
|
|
*
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <errno.h>
|
|
#include <watchdog.h>
|
|
#include <asm/io.h>
|
|
#include <serial.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/compiler.h>
|
|
|
|
/* Register definitions */
|
|
#define UCFG 0x00 /* UART config register */
|
|
#define UFC 0x04 /* Flow Control */
|
|
#define URX_SAMPLE 0x08 /* UART RX Sample register */
|
|
#define URT_TUNE 0x0C /* Fine tune of UART clk */
|
|
#define UTX_DATA 0x10 /* UART TX Character data */
|
|
#define URX_DATA 0x14 /* UART RX Character data */
|
|
#define UINFO 0x18 /* UART Info */
|
|
#define UINT_EN0 0x1C /* UART Interrupt enable 0 */
|
|
#define UINT_EN1 0x20 /* UART Interrupt enable 1 */
|
|
#define UINT0 0x24 /* UART Interrupt 0 setting/clearing */
|
|
#define UINT1 0x28 /* UART Interrupt 1 setting/clearing */
|
|
#define UINT_STAT 0x2C /* UART Interrupt Status */
|
|
|
|
/* UART Control Register Bit Fields */
|
|
#define UCFG_BAUD_COUNT_MASK 0xFFFFFF00
|
|
#define UCFG_BAUD_COUNT(x) ((x << 8) & UCFG_BAUD_COUNT_MASK)
|
|
#define UCFG_EN BIT(7)
|
|
#define UCFG_RX_EN BIT(6)
|
|
#define UCFG_TX_EN BIT(5)
|
|
#define UCFG_PARITY_EN BIT(4)
|
|
#define UCFG_PARITY_SEL BIT(3)
|
|
#define UCFG_2STOP_BIT BIT(2)
|
|
#define UCFG_CNT1 BIT(1)
|
|
#define UCFG_CNT0 BIT(0)
|
|
#define UCFG_CHAR_5 0
|
|
#define UCFG_CHAR_6 1
|
|
#define UCFG_CHAR_7 2
|
|
#define UCFG_CHAR_8 3
|
|
|
|
#define UINFO_TX_FIFO_EMPTY BIT(3)
|
|
#define UINFO_TX_FIFO_FULL BIT(2)
|
|
#define UINFO_RX_FIFO_EMPTY BIT(1)
|
|
#define UINFO_RX_FIFO_FULL BIT(0)
|
|
|
|
#define UINT_RX_NON_EMPTY BIT(6)
|
|
#define UINT_TX_EMPTY BIT(5)
|
|
#define UINT_RX_UNDERRUN BIT(4)
|
|
#define UINT_RX_OVERRUN BIT(3)
|
|
#define UINT_RX_PARITY_ERR BIT(2)
|
|
#define UINT_RX_STOP_ERR BIT(1)
|
|
#define UINT_TX_OVERRUN BIT(0)
|
|
#define UINT_MASK_ALL 0x7F
|
|
|
|
struct ca_uart_priv {
|
|
void __iomem *base;
|
|
};
|
|
|
|
int ca_serial_setbrg(struct udevice *dev, int baudrate)
|
|
{
|
|
struct ca_uart_priv *priv = dev_get_priv(dev);
|
|
unsigned int uart_ctrl, baud, sample;
|
|
|
|
baud = CORTINA_UART_CLOCK / baudrate;
|
|
|
|
uart_ctrl = readl(priv->base + UCFG);
|
|
uart_ctrl &= ~UCFG_BAUD_COUNT_MASK;
|
|
uart_ctrl |= UCFG_BAUD_COUNT(baud);
|
|
writel(uart_ctrl, priv->base + UCFG);
|
|
|
|
sample = baud / 2;
|
|
sample = (sample < 7) ? 7 : sample;
|
|
writel(sample, priv->base + URX_SAMPLE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ca_serial_getc(struct udevice *dev)
|
|
{
|
|
struct ca_uart_priv *priv = dev_get_priv(dev);
|
|
int ch;
|
|
|
|
ch = readl(priv->base + URX_DATA) & 0xFF;
|
|
|
|
return (int)ch;
|
|
}
|
|
|
|
static int ca_serial_putc(struct udevice *dev, const char ch)
|
|
{
|
|
struct ca_uart_priv *priv = dev_get_priv(dev);
|
|
unsigned int status;
|
|
|
|
/* Retry if TX FIFO full */
|
|
status = readl(priv->base + UINFO);
|
|
if (status & UINFO_TX_FIFO_FULL)
|
|
return -EAGAIN;
|
|
|
|
writel(ch, priv->base + UTX_DATA);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ca_serial_pending(struct udevice *dev, bool input)
|
|
{
|
|
struct ca_uart_priv *priv = dev_get_priv(dev);
|
|
unsigned int status;
|
|
|
|
status = readl(priv->base + UINFO);
|
|
|
|
if (input)
|
|
return (status & UINFO_RX_FIFO_EMPTY) ? 0 : 1;
|
|
else
|
|
return (status & UINFO_TX_FIFO_FULL) ? 1 : 0;
|
|
}
|
|
|
|
static int ca_serial_probe(struct udevice *dev)
|
|
{
|
|
struct ca_uart_priv *priv = dev_get_priv(dev);
|
|
u32 uart_ctrl;
|
|
|
|
/* Set data, parity and stop bits */
|
|
uart_ctrl = UCFG_EN | UCFG_TX_EN | UCFG_RX_EN | UCFG_CHAR_8;
|
|
writel(uart_ctrl, priv->base + UCFG);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ca_serial_of_to_plat(struct udevice *dev)
|
|
{
|
|
struct ca_uart_priv *priv = dev_get_priv(dev);
|
|
|
|
priv->base = dev_remap_addr_index(dev, 0);
|
|
if (!priv->base)
|
|
return -ENOENT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dm_serial_ops ca_serial_ops = {
|
|
.putc = ca_serial_putc,
|
|
.pending = ca_serial_pending,
|
|
.getc = ca_serial_getc,
|
|
.setbrg = ca_serial_setbrg,
|
|
};
|
|
|
|
static const struct udevice_id ca_serial_ids[] = {
|
|
{.compatible = "cortina,ca-uart"},
|
|
{}
|
|
};
|
|
|
|
U_BOOT_DRIVER(serial_cortina) = {
|
|
.name = "serial_cortina",
|
|
.id = UCLASS_SERIAL,
|
|
.of_match = ca_serial_ids,
|
|
.of_to_plat = ca_serial_of_to_plat,
|
|
.priv_auto = sizeof(struct ca_uart_priv),
|
|
.probe = ca_serial_probe,
|
|
.ops = &ca_serial_ops
|
|
};
|