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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (c) 2018 Alexander Graf <agraf@suse.de>
- */
- #include <common.h>
- #include <dm.h>
- #include <asm/gpio.h>
- #include <dm/pinctrl.h>
- #include <dm/platform_data/serial_pl01x.h>
- #include <serial.h>
- #include "serial_pl01x_internal.h"
- /*
- * Check if this serial device is muxed
- *
- * The serial device will only work properly if it has been muxed to the serial
- * pins by firmware. Check whether that happened here.
- *
- * @return true if serial device is muxed, false if not
- */
- static bool bcm283x_is_serial_muxed(void)
- {
- int serial_gpio = 15;
- struct udevice *dev;
- if (uclass_first_device(UCLASS_PINCTRL, &dev) || !dev)
- return false;
- if (pinctrl_get_gpio_mux(dev, 0, serial_gpio) != BCM2835_GPIO_ALT0)
- return false;
- return true;
- }
- static int bcm283x_pl011_serial_probe(struct udevice *dev)
- {
- struct pl01x_serial_plat *plat = dev_get_plat(dev);
- int ret;
- /* Don't spawn the device if it's not muxed */
- if (!bcm283x_is_serial_muxed())
- return -ENODEV;
- /*
- * Read the ofdata here rather than in an of_to_plat() method
- * since we need the soc simple-bus to be probed so that the 'ranges'
- * property is used.
- */
- ret = pl01x_serial_of_to_plat(dev);
- if (ret)
- return ret;
- /*
- * TODO: Reinitialization doesn't always work for now, just skip
- * init always - we know we're already initialized
- */
- plat->skip_init = true;
- return pl01x_serial_probe(dev);
- }
- static int bcm283x_pl011_serial_setbrg(struct udevice *dev, int baudrate)
- {
- int r;
- r = pl01x_serial_setbrg(dev, baudrate);
- /*
- * We may have been muxed to a bogus line before. Drain the RX
- * queue so we start at a clean slate.
- */
- while (pl01x_serial_getc(dev) != -EAGAIN) ;
- return r;
- }
- static const struct dm_serial_ops bcm283x_pl011_serial_ops = {
- .putc = pl01x_serial_putc,
- .pending = pl01x_serial_pending,
- .getc = pl01x_serial_getc,
- .setbrg = bcm283x_pl011_serial_setbrg,
- };
- static const struct udevice_id bcm283x_pl011_serial_id[] = {
- {.compatible = "brcm,bcm2835-pl011", .data = TYPE_PL011},
- {}
- };
- U_BOOT_DRIVER(bcm283x_pl011_uart) = {
- .name = "bcm283x_pl011",
- .id = UCLASS_SERIAL,
- .of_match = of_match_ptr(bcm283x_pl011_serial_id),
- .probe = bcm283x_pl011_serial_probe,
- .plat_auto = sizeof(struct pl01x_serial_plat),
- .ops = &bcm283x_pl011_serial_ops,
- #if !CONFIG_IS_ENABLED(OF_CONTROL) || CONFIG_IS_ENABLED(OF_BOARD)
- .flags = DM_FLAG_PRE_RELOC,
- #endif
- .priv_auto = sizeof(struct pl01x_priv),
- };
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