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From: "Peng Fan (OSS)" To: sstabellini@kernel.org, julien@xen.org, Volodymyr_Babchuk@epam.com, bertrand.marquis@arm.com Cc: andrew.cooper3@citrix.com, george.dunlap@citrix.com, jbeulich@suse.com, wl@xen.org, xen-devel@lists.xenproject.org, van.freenix@gmail.com, Peng Fan Subject: [PATCH 2/3] xen/arm: Add i.MX lpuart early printk support Date: Mon, 28 Feb 2022 09:07:10 +0800 Message-Id: <20220228010711.11566-3-peng.fan@oss.nxp.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20220228010711.11566-1-peng.fan@oss.nxp.com> References: <20220228010711.11566-1-peng.fan@oss.nxp.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SI2PR02CA0001.apcprd02.prod.outlook.com (2603:1096:4:194::10) To DU0PR04MB9417.eurprd04.prod.outlook.com (2603:10a6:10:358::11) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 5c43f520-0d5a-4339-c7f7-08d9fa5115cc X-MS-TrafficTypeDiagnostic: DB8PR04MB6460:EE_ X-MS-Exchange-SharedMailbox-RoutingAgent-Processed: True X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?Ox3s7WlQfZ+VfDVreq/oshTEe6eoZyEWMJ/7hudbrfqrZ1RhIf03X1uOkNhL?= =?us-ascii?Q?r3jU2UTYSQMIGmA/vN6RyEjf92I9Xv6LADRUlIQfNILnOzCf9dDEpiKI2+Gz?= =?us-ascii?Q?0HAWfZe89GkPE67OaeJQhr1PAFsquIRx99FWp+7wm4TL9d03UE+ubR9/ZY1M?= =?us-ascii?Q?D34M+SU1+NtYxGt/ZQMiT7hpM2jDeN1QVczwGd63ApGvDJraxk4dJu8YQ6z3?= =?us-ascii?Q?v1xKoAahTwz/BLqmhEk4OSnsXLoGSe9fFByDMGKWaAR7k5fD60zDc7PBi1f3?= =?us-ascii?Q?LmdrD8oSqRUeBr/KMQ1lhg1wfIqo2oa7mbA293/MTp+jyiYZXbHj1hmlLMw0?= =?us-ascii?Q?tVVVuj9MWunDXFQ/Fubzh85EB8R9pmT+fd6EXYoGlXBUi1JkQFmX7fxL6AB/?= =?us-ascii?Q?Bsm0LYfLVCesTCcxTNJMeW6+GdQ9ZcWvTehunVAlnz9AOe8KCexiBbK8w+hU?= =?us-ascii?Q?DckZBrPUPqS//hTh+5KOBKV9rk16B9i4SM/UE9Bs8TIu36JsDEFIj1ykCkU+?= =?us-ascii?Q?zVuCJenXUbMLS5uFnfJUZtGJZwRr1UaCBnyR7nB+lTn0HTu3Gqk058qnK4Bd?= =?us-ascii?Q?RB9BSsI9CF+HuXuumzft8hY6PTQm9r4lMQC7sONn+tMs1eMHfhbPm2EdustL?= =?us-ascii?Q?U1eZDQdWl3arb39q4PqO9tCGiteuR8evkT0L8pfmO0gxLi6GJB4pBuqugzes?= =?us-ascii?Q?xLZQMjwYgF6IhNe1Vxeby2Uz89UXu2DIdNXCyNQcCPVMYzOarGpwVrlKxZVd?= =?us-ascii?Q?hIhEH9h/ufZdZvblvUriDOhEvgRTqbiVGzaPkPPz8cRNhRjuXKMwbIDIh8Li?= =?us-ascii?Q?lXW1FaQg9oM7jeJFDF4A1fz+T1XFb1XtG6zNNDeLXF1vhBlFzgNIHaHgTsej?= =?us-ascii?Q?0nHmHqmfV2BgRTePlqRcd1wuLarA4T1YtbyHVwFq29mPmfswfAykh70lUvQl?= =?us-ascii?Q?pta5k1HjNAcZFEtju7Ov/9GQr8ASWmgI7V8ulXu4lzTFx9bpFhnDY/7hRV+L?= =?us-ascii?Q?+9PEn+faV0fR3kBjwFoz2IdVECHxi9kLG6yKy9A8C+1oHco76G79g1Ic6M2B?= =?us-ascii?Q?xBHGqgepqTa2gfNf9EKTQTTmu0J6Wb8QLgt4nqGpc+IA6/wr2f378FGPeREy?= =?us-ascii?Q?j/8hVxUcXSByCroi/Vbc8/LXnv2diz2/sUEHjxnNTGk8zO2BWmgfE3JEqsTj?= =?us-ascii?Q?U3ih+ba6u/GTlS8VhFz7T9N0276v9Uc0FUqm6SXbH5W0OOt5/Y58U0A4mz0V?= =?us-ascii?Q?j2FYUN4EJmdgquCgtFDIcLWUxhsIrSyCK4IlGC0EZvzhQ6lJsDQmzBhITFFS?= =?us-ascii?Q?718Q2404oyNz6wKubXKrGrhSgNtRWeRc97IIbDETCm6DIapcAnnb5kTZKLJk?= =?us-ascii?Q?uADE45L2pYEkvEn4f4lJdK3Aju8m2nnzPCr6RniEJ42zAYsqX1NJOZyeABxA?= =?us-ascii?Q?FzARX5ksPipfLPQYfcXKvYHBhu6sO7hkwQgTtSMvzPA+QR/WtFV5wCEgmM3A?= =?us-ascii?Q?Oy2Z2VwlY9XQhR+fy+VV9ScxRlFX6+pXoX7HqxmCr4ustgB9ekxc3Zp3pKAM?= =?us-ascii?Q?JdiliP0aUMuPfY9rc4IVg1s7cZI7ab+m2JuRgRztsSrMzxyAr/pPOtrbRnTE?= =?us-ascii?Q?FEpZfntLRfRObnEbhbHXu6I=3D?= X-OriginatorOrg: oss.nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 5c43f520-0d5a-4339-c7f7-08d9fa5115cc X-MS-Exchange-CrossTenant-AuthSource: DU0PR04MB9417.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Feb 2022 00:27:21.6403 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: nQDVnKWb2+ruoBIbLr+n6Kvrranrf1p0OwVzodIRM8BZZe/BTHabB8by4SBJ/8kLJ2rrR6OE+ikFJRRuq0+D5A== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB8PR04MB6460 From: Peng Fan Signed-off-by: Peng Fan --- xen/arch/arm/Kconfig.debug | 18 ++++++++++ xen/arch/arm/arm64/debug-imx-lpuart.inc | 48 +++++++++++++++++++++++++ 2 files changed, 66 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..9ecb446b3a 100644 --- a/xen/arch/arm/Kconfig.debug +++ b/xen/arch/arm/Kconfig.debug @@ -55,6 +55,20 @@ choice selecting one of the platform specific options below if you know the parameters for the port. + 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. + This option is preferred over the platform specific options; the platform specific options are deprecated and will soon be removed. @@ -186,6 +200,9 @@ 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 +300,7 @@ 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..7510210d46 --- /dev/null +++ b/xen/arch/arm/arm64/debug-imx-lpuart.inc @@ -0,0 +1,48 @@ +/* + * xen/arch/arm/arm64/debug-imx8qm.inc + * + * i.MX8QM specific debug code + * + * Peng Fan + * Copyright (C) 2016 Freescale Inc. + * + * 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 + +.macro early_uart_init wb wc wd +/* Already initialized in bootloader */ +.endm +/* i.MX8QM 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 + +/* i.MX8QM 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: + */ -- 2.30.0