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