mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 02:51:00 +00:00
b62450cf22
CONFIG_VAL(DEBUG_UART_BASE) expands to CONFIG_DEBUG_UART_BASE or
CONFIG_SPL_DEBUG_UART_BASE or CONFIG_TPL_DEBUG_UART_BASE and allows boards
to set different values for SPL, TPL and U-Boot Proper.
For ns16550 driver this support is there since commit d293759d55
("serial: ns16550: Add support for SPL_DEBUG_UART_BASE").
Signed-off-by: Pali Rohár <pali@kernel.org>
149 lines
3.2 KiB
C
149 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
|
|
* Scott McNutt <smcnutt@psyent.com>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <errno.h>
|
|
#include <serial.h>
|
|
#include <asm/io.h>
|
|
#include <linux/bitops.h>
|
|
|
|
/* status register */
|
|
#define ALTERA_UART_TMT BIT(5) /* tx empty */
|
|
#define ALTERA_UART_TRDY BIT(6) /* tx ready */
|
|
#define ALTERA_UART_RRDY BIT(7) /* rx ready */
|
|
|
|
struct altera_uart_regs {
|
|
u32 rxdata; /* Rx data reg */
|
|
u32 txdata; /* Tx data reg */
|
|
u32 status; /* Status reg */
|
|
u32 control; /* Control reg */
|
|
u32 divisor; /* Baud rate divisor reg */
|
|
u32 endofpacket; /* End-of-packet reg */
|
|
};
|
|
|
|
struct altera_uart_plat {
|
|
struct altera_uart_regs *regs;
|
|
unsigned int uartclk;
|
|
};
|
|
|
|
static int altera_uart_setbrg(struct udevice *dev, int baudrate)
|
|
{
|
|
struct altera_uart_plat *plat = dev_get_plat(dev);
|
|
struct altera_uart_regs *const regs = plat->regs;
|
|
u32 div;
|
|
|
|
div = (plat->uartclk / baudrate) - 1;
|
|
writel(div, ®s->divisor);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int altera_uart_putc(struct udevice *dev, const char ch)
|
|
{
|
|
struct altera_uart_plat *plat = dev_get_plat(dev);
|
|
struct altera_uart_regs *const regs = plat->regs;
|
|
|
|
if (!(readl(®s->status) & ALTERA_UART_TRDY))
|
|
return -EAGAIN;
|
|
|
|
writel(ch, ®s->txdata);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int altera_uart_pending(struct udevice *dev, bool input)
|
|
{
|
|
struct altera_uart_plat *plat = dev_get_plat(dev);
|
|
struct altera_uart_regs *const regs = plat->regs;
|
|
u32 st = readl(®s->status);
|
|
|
|
if (input)
|
|
return st & ALTERA_UART_RRDY ? 1 : 0;
|
|
else
|
|
return !(st & ALTERA_UART_TMT);
|
|
}
|
|
|
|
static int altera_uart_getc(struct udevice *dev)
|
|
{
|
|
struct altera_uart_plat *plat = dev_get_plat(dev);
|
|
struct altera_uart_regs *const regs = plat->regs;
|
|
|
|
if (!(readl(®s->status) & ALTERA_UART_RRDY))
|
|
return -EAGAIN;
|
|
|
|
return readl(®s->rxdata) & 0xff;
|
|
}
|
|
|
|
static int altera_uart_probe(struct udevice *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int altera_uart_of_to_plat(struct udevice *dev)
|
|
{
|
|
struct altera_uart_plat *plat = dev_get_plat(dev);
|
|
|
|
plat->regs = map_physmem(dev_read_addr(dev),
|
|
sizeof(struct altera_uart_regs),
|
|
MAP_NOCACHE);
|
|
plat->uartclk = dev_read_u32_default(dev, "clock-frequency", 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dm_serial_ops altera_uart_ops = {
|
|
.putc = altera_uart_putc,
|
|
.pending = altera_uart_pending,
|
|
.getc = altera_uart_getc,
|
|
.setbrg = altera_uart_setbrg,
|
|
};
|
|
|
|
static const struct udevice_id altera_uart_ids[] = {
|
|
{ .compatible = "altr,uart-1.0" },
|
|
{}
|
|
};
|
|
|
|
U_BOOT_DRIVER(altera_uart) = {
|
|
.name = "altera_uart",
|
|
.id = UCLASS_SERIAL,
|
|
.of_match = altera_uart_ids,
|
|
.of_to_plat = altera_uart_of_to_plat,
|
|
.plat_auto = sizeof(struct altera_uart_plat),
|
|
.probe = altera_uart_probe,
|
|
.ops = &altera_uart_ops,
|
|
};
|
|
|
|
#ifdef CONFIG_DEBUG_UART_ALTERA_UART
|
|
|
|
#include <debug_uart.h>
|
|
|
|
static inline void _debug_uart_init(void)
|
|
{
|
|
struct altera_uart_regs *regs = (void *)CONFIG_VAL(DEBUG_UART_BASE);
|
|
u32 div;
|
|
|
|
div = (CONFIG_DEBUG_UART_CLOCK / CONFIG_BAUDRATE) - 1;
|
|
writel(div, ®s->divisor);
|
|
}
|
|
|
|
static inline void _debug_uart_putc(int ch)
|
|
{
|
|
struct altera_uart_regs *regs = (void *)CONFIG_VAL(DEBUG_UART_BASE);
|
|
|
|
while (1) {
|
|
u32 st = readl(®s->status);
|
|
|
|
if (st & ALTERA_UART_TRDY)
|
|
break;
|
|
}
|
|
|
|
writel(ch, ®s->txdata);
|
|
}
|
|
|
|
DEBUG_UART_FUNCS
|
|
|
|
#endif
|