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https://github.com/brain-hackers/u-boot-brain
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caa4daa2ae
We use 'priv' for private data but often use 'platdata' for platform data. We can't really use 'pdata' since that is ambiguous (it could mean private or platform data). Rename some of the latter variables to end with 'plat' for consistency. Signed-off-by: Simon Glass <sjg@chromium.org>
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(UCLASS_PINCTRL, &dev) || !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_platdata *plat = dev_get_platdata(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 ofdata_to_platdata() 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_ofdata_to_platdata(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_platdata),
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.ops = &bcm283x_pl011_serial_ops,
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#if !CONFIG_IS_ENABLED(OF_CONTROL) || CONFIG_IS_ENABLED(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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