2 * Copyright (c) 2018 Alexander Graf <agraf@suse.de>
4 * SPDX-License-Identifier: GPL-2.0+
10 #include <dm/pinctrl.h>
11 #include <dm/platform_data/serial_pl01x.h>
13 #include "serial_pl01x_internal.h"
16 * Check if this serial device is muxed
18 * The serial device will only work properly if it has been muxed to the serial
19 * pins by firmware. Check whether that happened here.
21 * @return true if serial device is muxed, false if not
23 static bool bcm283x_is_serial_muxed(void)
28 if (uclass_first_device(UCLASS_PINCTRL, &dev) || !dev)
31 if (pinctrl_get_gpio_mux(dev, 0, serial_gpio) != BCM2835_GPIO_ALT0)
37 static int bcm283x_pl011_serial_ofdata_to_platdata(struct udevice *dev)
39 struct pl01x_serial_platdata *plat = dev_get_platdata(dev);
42 /* Don't spawn the device if it's not muxed */
43 if (!bcm283x_is_serial_muxed())
46 ret = pl01x_serial_ofdata_to_platdata(dev);
51 * TODO: Reinitialization doesn't always work for now, just skip
52 * init always - we know we're already initialized
54 plat->skip_init = true;
59 static int bcm283x_pl011_serial_setbrg(struct udevice *dev, int baudrate)
63 r = pl01x_serial_setbrg(dev, baudrate);
66 * We may have been muxed to a bogus line before. Drain the RX
67 * queue so we start at a clean slate.
69 while (pl01x_serial_getc(dev) != -EAGAIN) ;
74 static const struct dm_serial_ops bcm283x_pl011_serial_ops = {
75 .putc = pl01x_serial_putc,
76 .pending = pl01x_serial_pending,
77 .getc = pl01x_serial_getc,
78 .setbrg = bcm283x_pl011_serial_setbrg,
81 static const struct udevice_id bcm283x_pl011_serial_id[] = {
82 {.compatible = "brcm,bcm2835-pl011", .data = TYPE_PL011},
86 U_BOOT_DRIVER(bcm283x_pl011_uart) = {
87 .name = "bcm283x_pl011",
89 .of_match = of_match_ptr(bcm283x_pl011_serial_id),
90 .ofdata_to_platdata = of_match_ptr(bcm283x_pl011_serial_ofdata_to_platdata),
91 .platdata_auto_alloc_size = sizeof(struct pl01x_serial_platdata),
92 .probe = pl01x_serial_probe,
93 .ops = &bcm283x_pl011_serial_ops,
94 .flags = DM_FLAG_PRE_RELOC,
95 .priv_auto_alloc_size = sizeof(struct pl01x_priv),