Hi Peng, > On 14 Apr 2022, at 08:44, Peng Fan (OSS) <peng....@oss.nxp.com> wrote: > > From: Peng Fan <peng....@nxp.com> > > Signed-off-by: Peng Fan <peng....@nxp.com> Acked-by: Bertrand Marquis <bertrand.marq...@arm.com>
Cheers Bertrand > --- > xen/arch/arm/Kconfig.debug | 14 ++++++++ > xen/arch/arm/arm64/debug-imx-lpuart.inc | 48 +++++++++++++++++++++++++ > 2 files changed, 62 insertions(+) > create mode 100644 xen/arch/arm/arm64/debug-imx-lpuart.inc > > diff --git a/xen/arch/arm/Kconfig.debug b/xen/arch/arm/Kconfig.debug > index 35ccd13273..842d768280 100644 > --- a/xen/arch/arm/Kconfig.debug > +++ b/xen/arch/arm/Kconfig.debug > @@ -58,6 +58,16 @@ choice > This option is preferred over the platform specific > options; the platform specific options are deprecated > and will soon be removed. > + config EARLY_UART_CHOICE_IMX_LPUART > + select EARLY_UART_IMX_LPUART > + depends on ARM_64 > + bool "Early printk via i.MX LPUART" > + help > + Say Y here if you wish the early printk to direct their > + output to a i.MX LPUART. You can use this option to > + provide the parameters for the i.MX LPUART rather than > + selecting one of the platform specific options below if > + you know the parameters for the port. > config EARLY_UART_CHOICE_MESON > select EARLY_UART_MESON > depends on ARM_64 > @@ -186,6 +196,9 @@ config EARLY_UART_CADENCE > config EARLY_UART_EXYNOS4210 > select EARLY_PRINTK > bool > +config EARLY_UART_IMX_LPUART > + select EARLY_PRINTK > + bool > config EARLY_UART_MESON > select EARLY_PRINTK > bool > @@ -283,6 +296,7 @@ config EARLY_PRINTK_INC > default "debug-8250.inc" if EARLY_UART_8250 > default "debug-cadence.inc" if EARLY_UART_CADENCE > default "debug-exynos4210.inc" if EARLY_UART_EXYNOS4210 > + default "debug-imx-lpuart.inc" if EARLY_UART_IMX_LPUART > default "debug-meson.inc" if EARLY_UART_MESON > default "debug-mvebu.inc" if EARLY_UART_MVEBU > default "debug-pl011.inc" if EARLY_UART_PL011 > diff --git a/xen/arch/arm/arm64/debug-imx-lpuart.inc > b/xen/arch/arm/arm64/debug-imx-lpuart.inc > new file mode 100644 > index 0000000000..b169332932 > --- /dev/null > +++ b/xen/arch/arm/arm64/debug-imx-lpuart.inc > @@ -0,0 +1,48 @@ > +/* > + * xen/arch/arm/arm64/debug-imx-lpuart.inc > + * > + * i.MX8QM specific debug code > + * > + * Peng Fan <peng....@nxp.com> > + * Copyright 2022 NXP > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation; either version 2 of the License, or > + * (at your option) any later version. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + */ > + > +#include <asm/imx-lpuart.h> > + > +/* > + * Wait LPUART to be ready to transmit > + * rb: register which contains the UART base address > + * rc: scratch register > + */ > +.macro early_uart_ready xb, c > +1: > + ldr w\c, [\xb, #UARTSTAT] /* <- Flag register */ > + tst w\c, #UARTSTAT_TDRE /* Check FIFO EMPTY bit */ > + beq 1b /* Wait for the UART to be ready */ > +.endm > + > +/* > + * LPUART transmit character > + * rb: register which contains the UART base address > + * rt: register which contains the character to transmit > + */ > +.macro early_uart_transmit xb, wt > + str \wt, [\xb, #UARTDATA] /* -> Data Register */ > +.endm > + > +/* > + * Local variables: > + * mode: ASM > + * indent-tabs-mode: nil > + * End: > + */ > -- > 2.35.1 >
