[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen master] xen/arm: Add i.MX lpuart early printk support
commit e9935146cd695188e70c10a6dda9f24ef9b63e30 Author: Peng Fan <peng.fan@xxxxxxx> AuthorDate: Tue Apr 19 12:39:27 2022 +0800 Commit: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx> CommitDate: Tue Apr 19 17:38:53 2022 -0700 xen/arm: Add i.MX lpuart early printk support Signed-off-by: Peng Fan <peng.fan@xxxxxxx> Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx> Acked-by: Bertrand Marquis <bertrand.marquis@xxxxxxx> Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx> --- xen/arch/arm/Kconfig.debug | 14 ++++++++++ xen/arch/arm/arm64/debug-imx-lpuart.inc | 48 +++++++++++++++++++++++++++++++++ 2 files changed, 62 insertions(+) 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.fan@xxxxxxx> + * 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: + */ -- generated by git-patchbot for /home/xen/git/xen.git#master
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