From: Amit Singh Tomar <amittomer25@gmail.com> To: xen-devel@lists.xenproject.org Cc: andre.przywara@arm.com, julien.grall@arm.com, sstabellini@kernel.org, Amit Singh Tomar <amittomer25@gmail.com> Subject: [PATCH v3] xen/arm: Add Amlogic Meson SoCs earlyprintk support Date: Sun, 14 Apr 2019 12:03:31 +0530 [thread overview] Message-ID: <1555223611-10263-1-git-send-email-amittomer25@gmail.com> (raw) This patch adds earlyprintk support for Amlogic Meson SoC based boards. It relies on firmware[1] to initialize the UART. Tested With: http://wiki.friendlyarm.com/wiki/index.php/NanoPi_K2 [1]: https://github.com/ARM-software/arm-trusted-firmware/blob/master/drivers/meson/console/aarch64/meson_console.S#L92 Signed-off-by: Amit Singh Tomar <amittomer25@gmail.com> --- Changes since v2: * Added the commit message that talks about uart initialization. * Added dummy early_uart_init function. Changes since v1: * Fixed coding style issue. * Undone changes in early-printk.txt. Changes since RFC: * Replaced LDRH with LDR, with this there is no scattered output on console now. * Used tbnz instead of tst and b.ne. * Used AML_ prefix against register names. --- xen/arch/arm/arm64/debug-meson.inc | 55 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 xen/arch/arm/arm64/debug-meson.inc diff --git a/xen/arch/arm/arm64/debug-meson.inc b/xen/arch/arm/arm64/debug-meson.inc new file mode 100644 index 0000000..e1a8fa8 --- /dev/null +++ b/xen/arch/arm/arm64/debug-meson.inc @@ -0,0 +1,55 @@ +/* + * xen/arch/arm/arm64/debug-meson.inc + * + * MESON specific debug code. + * + * Copyright (c) 2019, Amit Singh Tomar <amittomer25@gmail.com>. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms and conditions of the GNU General Public + * License, version 2, as published by the Free Software Foundation. + * + * 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. + * + * You should have received a copy of the GNU General Public + * License along with this program; If not, see <http://www.gnu.org/licenses/>. + */ + +#define AML_UART_WFIFO_REG 0x00 +#define AML_UART_STATUS_REG 0x0c + +#define AML_UART_TX_FIFO_FULL 21 + +.macro early_uart_init xb, c +/* Uart has already been initialized by Firmware, for instance by TF-A */ +.endm + +/* + * MESON UART wait UART to be ready to transmit + * xb: register which contains the UART base address + * c: scratch register + */ +.macro early_uart_ready xb c +1: + ldr w\c, [\xb, #AML_UART_STATUS_REG] /* status register */ + tbnz w\c, #AML_UART_TX_FIFO_FULL, 1b /* Check TXFIFO FULL bit */ +.endm + +/* + * MESON 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 + str \wt, [\xb, #AML_UART_WFIFO_REG] +.endm + +/* + * Local variables: + * mode: ASM + * indent-tabs-mode: nil + * End: + */ -- 2.7.4 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
WARNING: multiple messages have this Message-ID (diff)
From: Amit Singh Tomar <amittomer25@gmail.com> To: xen-devel@lists.xenproject.org Cc: andre.przywara@arm.com, julien.grall@arm.com, sstabellini@kernel.org, Amit Singh Tomar <amittomer25@gmail.com> Subject: [Xen-devel] [PATCH v3] xen/arm: Add Amlogic Meson SoCs earlyprintk support Date: Sun, 14 Apr 2019 12:03:31 +0530 [thread overview] Message-ID: <1555223611-10263-1-git-send-email-amittomer25@gmail.com> (raw) Message-ID: <20190414063331.62NcgWjUI-xYLvPLO3qNQulwluIgA8Lp-pfQWQlnLUA@z> (raw) This patch adds earlyprintk support for Amlogic Meson SoC based boards. It relies on firmware[1] to initialize the UART. Tested With: http://wiki.friendlyarm.com/wiki/index.php/NanoPi_K2 [1]: https://github.com/ARM-software/arm-trusted-firmware/blob/master/drivers/meson/console/aarch64/meson_console.S#L92 Signed-off-by: Amit Singh Tomar <amittomer25@gmail.com> --- Changes since v2: * Added the commit message that talks about uart initialization. * Added dummy early_uart_init function. Changes since v1: * Fixed coding style issue. * Undone changes in early-printk.txt. Changes since RFC: * Replaced LDRH with LDR, with this there is no scattered output on console now. * Used tbnz instead of tst and b.ne. * Used AML_ prefix against register names. --- xen/arch/arm/arm64/debug-meson.inc | 55 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 xen/arch/arm/arm64/debug-meson.inc diff --git a/xen/arch/arm/arm64/debug-meson.inc b/xen/arch/arm/arm64/debug-meson.inc new file mode 100644 index 0000000..e1a8fa8 --- /dev/null +++ b/xen/arch/arm/arm64/debug-meson.inc @@ -0,0 +1,55 @@ +/* + * xen/arch/arm/arm64/debug-meson.inc + * + * MESON specific debug code. + * + * Copyright (c) 2019, Amit Singh Tomar <amittomer25@gmail.com>. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms and conditions of the GNU General Public + * License, version 2, as published by the Free Software Foundation. + * + * 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. + * + * You should have received a copy of the GNU General Public + * License along with this program; If not, see <http://www.gnu.org/licenses/>. + */ + +#define AML_UART_WFIFO_REG 0x00 +#define AML_UART_STATUS_REG 0x0c + +#define AML_UART_TX_FIFO_FULL 21 + +.macro early_uart_init xb, c +/* Uart has already been initialized by Firmware, for instance by TF-A */ +.endm + +/* + * MESON UART wait UART to be ready to transmit + * xb: register which contains the UART base address + * c: scratch register + */ +.macro early_uart_ready xb c +1: + ldr w\c, [\xb, #AML_UART_STATUS_REG] /* status register */ + tbnz w\c, #AML_UART_TX_FIFO_FULL, 1b /* Check TXFIFO FULL bit */ +.endm + +/* + * MESON 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 + str \wt, [\xb, #AML_UART_WFIFO_REG] +.endm + +/* + * Local variables: + * mode: ASM + * indent-tabs-mode: nil + * End: + */ -- 2.7.4 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
next reply other threads:[~2019-04-14 6:33 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-04-14 6:33 Amit Singh Tomar [this message] 2019-04-14 6:33 ` [Xen-devel] [PATCH v3] xen/arm: Add Amlogic Meson SoCs earlyprintk support Amit Singh Tomar 2019-04-14 16:10 ` Julien Grall 2019-04-14 16:10 ` [Xen-devel] " Julien Grall 2019-04-14 16:35 ` Amit Tomer 2019-04-14 16:35 ` [Xen-devel] " Amit Tomer 2019-04-14 16:39 ` Julien Grall 2019-04-14 16:39 ` [Xen-devel] " Julien Grall
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