mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 00:47:26 +00:00
5ec6cbcc7f
Add dm_serial driver source code for S5P4418 SOC. Extend the "arm,pl011" driver by init of UART-clock and UART-reset. Signed-off-by: Stefan Bosch <stefan_b@posteo.net>
94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2022 Stefan Bosch <stefan_b@posteo.net>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <asm/arch/clk.h>
|
|
#include <asm/arch/reset.h>
|
|
#include <linux/delay.h>
|
|
|
|
#include <dm/platform_data/serial_pl01x.h>
|
|
#include <serial.h>
|
|
#include "serial_pl01x_internal.h"
|
|
|
|
int s5p4418_pl011_serial_probe(struct udevice *dev)
|
|
{
|
|
struct pl01x_serial_plat *plat = dev_get_plat(dev);
|
|
struct clk *nx_clk;
|
|
ulong rate_act;
|
|
char uart_clk_name[10];
|
|
int uart_num = -1;
|
|
int rst_id, ret;
|
|
|
|
if (!plat->skip_init) {
|
|
uart_num = dev->seq_;
|
|
rst_id = RESET_ID_UART0 + uart_num;
|
|
|
|
if (uart_num < 0 || rst_id > RESET_ID_UART5) {
|
|
/* invalid UART-number */
|
|
debug("%s: sequence/uart number %d is invalid!\n", __func__, uart_num);
|
|
return -ENODEV;
|
|
}
|
|
|
|
sprintf(uart_clk_name, "nx-uart.%d", uart_num);
|
|
nx_clk = clk_get(uart_clk_name);
|
|
if (!nx_clk) {
|
|
debug("%s: clk_get('%s') failed!\n", __func__, uart_clk_name);
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* wait to make sure all pending characters have been sent */
|
|
mdelay(100);
|
|
}
|
|
|
|
/*
|
|
* Note: Unless !plat->skip_init, the UART is disabled here, so printf()
|
|
* or debug() must not be used until pl01x_serial_setbrg() has been called
|
|
* (enables the UART). Otherwise u-boot is hanging!
|
|
*/
|
|
ret = pl01x_serial_probe(dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!plat->skip_init) {
|
|
/* do reset UART */
|
|
nx_rstcon_setrst(rst_id, RSTCON_ASSERT);
|
|
udelay(10);
|
|
nx_rstcon_setrst(rst_id, RSTCON_NEGATE);
|
|
udelay(10);
|
|
clk_disable(nx_clk);
|
|
|
|
rate_act = clk_set_rate(nx_clk, plat->clock);
|
|
clk_enable(nx_clk);
|
|
|
|
plat->clock = rate_act;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dm_serial_ops s5p4418_pl011_serial_ops = {
|
|
.putc = pl01x_serial_putc,
|
|
.pending = pl01x_serial_pending,
|
|
.getc = pl01x_serial_getc,
|
|
.setbrg = pl01x_serial_setbrg,
|
|
};
|
|
|
|
static const struct udevice_id s5p4418_pl011_serial_id[] = {
|
|
{.compatible = "nexell,s5p4418-pl011", .data = TYPE_PL011},
|
|
{}
|
|
};
|
|
|
|
U_BOOT_DRIVER(s5p4418_pl011_uart) = {
|
|
.name = "s5p4418_pl011",
|
|
.id = UCLASS_SERIAL,
|
|
.of_match = of_match_ptr(s5p4418_pl011_serial_id),
|
|
.of_to_plat = of_match_ptr(pl01x_serial_of_to_plat),
|
|
.plat_auto = sizeof(struct pl01x_serial_plat),
|
|
.probe = s5p4418_pl011_serial_probe,
|
|
.ops = &s5p4418_pl011_serial_ops,
|
|
.flags = DM_FLAG_PRE_RELOC,
|
|
.priv_auto = sizeof(struct pl01x_priv),
|
|
};
|