From: "Edgar E. Iglesias" <edgar.igles...@xilinx.com> Reviewed-by: Julien Grall <julien.gr...@linaro.org> Signed-off-by: Edgar E. Iglesias <edgar.igles...@xilinx.com> --- docs/misc/arm/early-printk.txt | 1 + xen/arch/arm/Rules.mk | 6 +++++ xen/arch/arm/arm64/debug-cadence.inc | 45 ++++++++++++++++++++++++++++++++++++ 3 files changed, 52 insertions(+) create mode 100644 xen/arch/arm/arm64/debug-cadence.inc
diff --git a/docs/misc/arm/early-printk.txt b/docs/misc/arm/early-printk.txt index 859c635..710f07e 100644 --- a/docs/misc/arm/early-printk.txt +++ b/docs/misc/arm/early-printk.txt @@ -21,6 +21,7 @@ where mach is the name of the machine: - seattle: printk with pl011 for AMD Seattle processor - lager: printk with SCIF0 on Renesas R-Car H2 processors - thunderx: printk with pl011 for Cavium ThunderX processor + - zynqmp: printk with Cadence UART for Xilinx ZynqMP SoCs The base address and baud rate is hardcoded in xen/arch/arm/Rules.mk, see there when adding support for new machines. diff --git a/xen/arch/arm/Rules.mk b/xen/arch/arm/Rules.mk index 54efa91..818a5bc 100644 --- a/xen/arch/arm/Rules.mk +++ b/xen/arch/arm/Rules.mk @@ -118,6 +118,12 @@ EARLY_PRINTK_INC := pl011 EARLY_UART_BASE_ADDRESS := 0x87e024000000 endif +ifeq ($(CONFIG_EARLY_PRINTK), zynqmp) +EARLY_PRINTK_INC := cadence +EARLY_PRINTK_BAUD := 115200 +EARLY_UART_BASE_ADDRESS := 0xff000000 +endif + ifneq ($(EARLY_PRINTK_INC),) EARLY_PRINTK := y endif diff --git a/xen/arch/arm/arm64/debug-cadence.inc b/xen/arch/arm/arm64/debug-cadence.inc new file mode 100644 index 0000000..84dee4c --- /dev/null +++ b/xen/arch/arm/arm64/debug-cadence.inc @@ -0,0 +1,45 @@ +/* + * xen/arch/arm/arm64/debug-cadence.S + * + * Cadence UART specific debug code + * + * Copyright (c) 2015 Xilinx Inc. + * Written by Edgar E. Iglesias. + * + * 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/asm_defns.h> +#include <asm/cadence-uart.h> + +/* Cadence UART wait UART to be ready to transmit + * xb: register which contains the UART base address + * c: scratch register number */ +.macro early_uart_ready xb, c +1: + ldrh w\c, [\xb, #R_UART_SR] + tst w\c, #UART_SR_INTR_TFUL + b.ne 1b +.endm + +/* Cadence UART transmit character + * xb: register which contains the UART base address + * wt: register which contains the character to transmit */ +.macro early_uart_transmit xb, wt + strb \wt, [\xb, #R_UART_TX] +.endm + +/* + * Local variables: + * mode: ASM + * indent-tabs-mode: nil + * End: + */ -- 1.9.1 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
