mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-25 06:00:43 +00:00
3f8b8e3036
U-Boot support on Raspberry Pi 4 relies on the device-tree provided by the firmware. The blob does not contain the U-Boot specific pre-loc-rel properties. The result is, that the U-Boot banner is not printed. We fix this by setting the DM_FLAG_PRE_RELOC flag in the driver, if we rely on a device-tree provided by the firmware. Reported-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: Matthias Brugger <mbrugger@suse.com>
97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
// 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_ofdata_to_platdata(struct udevice *dev)
|
|
{
|
|
struct pl01x_serial_platdata *plat = dev_get_platdata(dev);
|
|
int ret;
|
|
|
|
/* Don't spawn the device if it's not muxed */
|
|
if (!bcm283x_is_serial_muxed())
|
|
return -ENODEV;
|
|
|
|
ret = pl01x_serial_ofdata_to_platdata(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 0;
|
|
}
|
|
|
|
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),
|
|
.ofdata_to_platdata = of_match_ptr(bcm283x_pl011_serial_ofdata_to_platdata),
|
|
.platdata_auto_alloc_size = sizeof(struct pl01x_serial_platdata),
|
|
.probe = pl01x_serial_probe,
|
|
.ops = &bcm283x_pl011_serial_ops,
|
|
#if !CONFIG_IS_ENABLED(OF_CONTROL) || CONFIG_IS_ENABLED(OF_BOARD)
|
|
.flags = DM_FLAG_PRE_RELOC,
|
|
#endif
|
|
.priv_auto_alloc_size = sizeof(struct pl01x_priv),
|
|
};
|