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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2018 Alexander Graf <agraf@suse.de>
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*/
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#include <common.h>
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#include <dm.h>
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#include <asm/gpio.h>
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#include <dm/pinctrl.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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/*
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* Check if this serial device is muxed
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*
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* The serial device will only work properly if it has been muxed to the serial
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* pins by firmware. Check whether that happened here.
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*
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* Return: true if serial device is muxed, false if not
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*/
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static bool bcm283x_is_serial_muxed(void)
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{
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int serial_gpio = 15;
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struct udevice *dev;
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if (uclass_first_device_err(UCLASS_PINCTRL, &dev))
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return false;
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if (pinctrl_get_gpio_mux(dev, 0, serial_gpio) != BCM2835_GPIO_ALT0)
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return false;
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return true;
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}
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static int bcm283x_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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int ret;
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/* Don't spawn the device if it's not muxed */
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if (!bcm283x_is_serial_muxed())
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return -ENODEV;
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/*
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* Read the ofdata here rather than in an of_to_plat() method
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* since we need the soc simple-bus to be probed so that the 'ranges'
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* property is used.
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*/
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ret = pl01x_serial_of_to_plat(dev);
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if (ret)
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return ret;
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/*
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* TODO: Reinitialization doesn't always work for now, just skip
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* init always - we know we're already initialized
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*/
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plat->skip_init = true;
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return pl01x_serial_probe(dev);
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}
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static int bcm283x_pl011_serial_setbrg(struct udevice *dev, int baudrate)
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{
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int r;
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r = pl01x_serial_setbrg(dev, baudrate);
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/*
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* We may have been muxed to a bogus line before. Drain the RX
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* queue so we start at a clean slate.
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*/
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while (pl01x_serial_getc(dev) != -EAGAIN) ;
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return r;
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}
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static const struct dm_serial_ops bcm283x_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 = bcm283x_pl011_serial_setbrg,
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};
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static const struct udevice_id bcm283x_pl011_serial_id[] = {
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{.compatible = "brcm,bcm2835-pl011", .data = TYPE_PL011},
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{}
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};
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U_BOOT_DRIVER(bcm283x_pl011_uart) = {
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.name = "bcm283x_pl011",
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.id = UCLASS_SERIAL,
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.of_match = of_match_ptr(bcm283x_pl011_serial_id),
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.probe = bcm283x_pl011_serial_probe,
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.plat_auto = sizeof(struct pl01x_serial_plat),
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.ops = &bcm283x_pl011_serial_ops,
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#if !CONFIG_IS_ENABLED(OF_CONTROL) || IS_ENABLED(CONFIG_OF_BOARD)
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.flags = DM_FLAG_PRE_RELOC,
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#endif
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.priv_auto = sizeof(struct pl01x_priv),
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};
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