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 <stefa...@posteo.net>
---
MAINTAINERS | 1 +
drivers/serial/serial_s5p4418_pl011.c | 94 +++++++++++++++++++++++++++
2 files changed, 95 insertions(+)
create mode 100644 drivers/serial/serial_s5p4418_pl011.c
diff --git a/MAINTAINERS b/MAINTAINERS
index cb4d44584d..3473f765fd 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -411,6 +411,7 @@ F: drivers/gpio/nx_gpio.c
F: drivers/i2c/nx_i2c.c
F: drivers/mmc/nexell_dw_mmc_dm.c
F: drivers/pinctrl/nexell/
+F: drivers/serial/serial_s5p4418_pl011.c
F: drivers/video/nexell/
F: drivers/video/nexell_display.c
F: include/configs/s5p4418_nanopi2.h
diff --git a/drivers/serial/serial_s5p4418_pl011.c
b/drivers/serial/serial_s5p4418_pl011.c
new file mode 100644
index 0000000000..e4492e662e
--- /dev/null
+++ b/drivers/serial/serial_s5p4418_pl011.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2022 Stefan Bosch <stefa...@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),
+};
--
2.17.1
