From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4D052CD342C for ; Wed, 6 May 2026 19:34:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=ilUL26n1rjGYeNrOGQ28D9s1uztNCB3AEwbB2W2pXWM=; b=ZKA/bDEWyYrIauD8jDzpzquVPo 9bizpRVzPKac7AIVYEyfQ9G3qFBKmTCTX8s2/ojKr1zRnOGO1ITthlFK072kMNIznsI8F8WektTmB X6ks5xXfxLaZIIjwRC7cSddRmCY6RsHEIR81Mrrlk078PnGlIKGYokQ8G7p6fvSl9L1yiXNgfmAJb z3NhZAaycHThZO5n91maR4nqK44mWIlCkg6KsG/bJCAp2cuZTOLrDey3Rby43ac6X54G+aA2L9bXk 2ftmgKe/SLr4qVDBaa49tbhI66LklbtRFE3d00Mp+Sumh0u46FDg4GP9w4O44sYwIxAK5sBZIFcPH Bu+ajSlA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wKi0Y-00000001t2q-3WFu; Wed, 06 May 2026 19:34:10 +0000 Received: from mail-wr1-x42b.google.com ([2a00:1450:4864:20::42b]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wKi0V-00000001t0x-20WY for linux-arm-kernel@lists.infradead.org; Wed, 06 May 2026 19:34:09 +0000 Received: by mail-wr1-x42b.google.com with SMTP id ffacd0b85a97d-44c350a5b87so49417f8f.3 for ; Wed, 06 May 2026 12:34:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1778096046; x=1778700846; darn=lists.infradead.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=ilUL26n1rjGYeNrOGQ28D9s1uztNCB3AEwbB2W2pXWM=; b=iDVE9di0agLQNijnyoFVsbCp2UdLubSDWLXZEQINnvr5y0VTK0CaeYl3GrRYDLq95V wFwRw97tsWHJuyb1UDnkKuoOT9sm8Bf5YirOuPmnseGsetyy+RxIHRz+WbQJvW+dA3By bx7VtGZxjKoFD3ZzTgvIDtwTuAaqL7u3a4O1cs8ew/jgLNqGwiu498YiK90NIYelu92J LnpDT3nO3Q1hH2HobwFKvbAbOpHVk0vyHt+SnSVh/5zr7W4JJ/L6g/DVlaGJfldqPC9p QTrl1CTKqSivOaGLA4JMXru0rESd5HSnwkMuyzNWgB7qiqW50LTlSEwW81vnXID5J4un jZcw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1778096046; x=1778700846; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-gg:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to; bh=ilUL26n1rjGYeNrOGQ28D9s1uztNCB3AEwbB2W2pXWM=; b=Xh/3gWipSpIIAnemng6nCKUrTdNb5BWw4f67i2wdg93z+iZoHL5feWaeJLZNd+EC2o AvGFdMWx1UATe9+P0m2OjvhKPxy/8z/6zIztL8W576Bn2g9+Us/JcgPtKLeF3iaWTXZE 5KYDwLw20bMVQgVKSyNLjfjHt5tHe4fjJa/sS6ryFBwZGuLmpbJbHHxt2pm6l3QjWqtG ygfl5aRWFmWWXrjCGt+3mik510QYzqhSt7yAuatS6w5ltKth/it8W4q5InIYjCCVBSQE mb7YuiPlOu7NGZoZ3km5m1V7t0Okc77CaClvs4phd9e6gp+Mnb68Z7oLD+0cfJ8EKET5 FaKQ== X-Forwarded-Encrypted: i=1; AFNElJ8YFbSRLDUVpwkU/Yt3vhP0rdcRZ+0KrQVJcndMGjScOUEzmQTLTxXJPgrUAoe2JvEqp8NE0CjV0AhTNaocfoA0@lists.infradead.org X-Gm-Message-State: AOJu0YyTvY6ywBf41J9Hw588BmbuX5A0xCxTaN/xFYiyGAOe9pq+VZpc s5AKhWGBIaarhbsqtRd78f5pXarRmJyEN1Rq2ogPE7ZqmxB2jBoYay/7 X-Gm-Gg: AeBDietRI3mZy3Zogpub7KI3I4zljHpwbJL8cETcgi43iinhAMQwJITNAIhqHMKngvs UlT2ceFjKjqk5NwARjQvvGAOI1j3HljCdN0Uec4cjRxnLOEmCygmEKsAhAVmbXA+Dw/6dWvnibr YY2GyN6vk7mhVMQgWPOSbiatBuHXSyNy01WTqX8s6Ak2uSZ241tEsR3OHS10WRBKn1eFdgZrRJI jJYXVSHNecnJx3TLVCh1nmyhi/pymESGOEFeBNmAXIG6OqmGovlYDa4VAQOjHz0xRuYc88G4u2e QGNQ3JbrplWju/v0hdhHKwhEzvBJk6/7nslfesTjtZFvSghl0i312KZ02ZVDpfXFzsq057tutRJ 8Myb+QubtvIwLyIWh4+DqUZ0CKDRR/iJEA5vwFLqyMWIYCVqGYSJMq/KGJRXSUT0JRR9gMe0u5q 0fkvXTzLBAX78FiN1ieexsHqW1xptBkmom7PWGoEJC1q4= X-Received: by 2002:a05:6000:290c:b0:43b:4982:fc73 with SMTP id ffacd0b85a97d-4515c57465amr8159966f8f.25.1778096045780; Wed, 06 May 2026 12:34:05 -0700 (PDT) Received: from [192.168.0.2] ([197.250.51.29]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-45055960022sm14895673f8f.26.2026.05.06.12.34.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 06 May 2026 12:34:05 -0700 (PDT) From: =?utf-8?q?Stefan_D=C3=B6singer?= Date: Wed, 06 May 2026 22:33:20 +0300 Subject: [PATCH v8 3/6] ARM: zte: Add support for zx29 low level debug MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <20260506-send-v8-3-f1bdf3243b34@gmail.com> References: <20260506-send-v8-0-f1bdf3243b34@gmail.com> In-Reply-To: <20260506-send-v8-0-f1bdf3243b34@gmail.com> To: Jonathan Corbet , Shuah Khan , Russell King , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Arnd Bergmann , Krzysztof Kozlowski , Alexandre Belloni , Linus Walleij , Drew Fustini , Greg Kroah-Hartman , Jiri Slaby Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, soc@lists.linux.dev, linux-serial@vger.kernel.org, =?utf-8?q?Stefan_D=C3=B6singer?= X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=2902; i=stefandoesinger@gmail.com; h=from:subject:message-id; bh=fcg5dGJNBAQyU4b2cL0nA3wqgVJTqz/EfkeGsaL9qZo=; b=owEBiQJ2/ZANAwAIAT0TvMhUTxoiAcsmYgBp+5eWHMnqBAGLcyW54UYM1CAyGLQMWIHuikrQl y0IeI0wWVCJAk8EAAEIADkWIQRDFvS2qgVbJ5UyXWw9E7zIVE8aIgUCafuXlhsUgAAAAAAEAA5t YW51MiwyLjUrMS4xMiwyLDIACgkQPRO8yFRPGiKoNg//WNV3zil9essnB/1w2NGojHfI3ct0p7k s7kK2TKGuBVgMsUetJH7xCF8c94Nm2AUnnEPsAnWf2ORenjfzAdvqtuDTw7JbVtCCtEoMnm8JwF GepqzU6j4p4z9t1hiNP615EHi0cY+N435sJnmOvXK/+WPKwThqx7rCFaakJlr4TdvuxULALOOXx pdqSI0dvr8DzynlLLQyc6nPmm0dGtNAZ31NkyoavEiDa6CnoZJtovW4U5OPyp4RS+NNHj+Et3ln Yw1qcLBkhYr3KpmzA/qxpFUtgrP1XOxuJweDcPJT0RB9I3UBl/1HpTYmt4uNEIB6QuwDaV1yjI3 XWPKMwZ4NjPb1uuM2Y+ioJTzAxewvaXU0R1WTmsnnOU3U1qnvqfIpnIcHhP1c6kQi+IXnNyAAnh /TBWYv4ajE5JdtAAr0B12Ordg/FiOMm9DfDnhQnlNUaM564a93xn1iMFnH7df8Rk99mIL3kwiEf p01lGtGtq+w6+I0gBaDGzzgur+b5yxijspBSodKyeddnGLtUiT05+yWRkvPSJ5fUeasctGdRBQm O8+Dx/rgTRRYlBL+rOf5UeDw1v01Jd9dz0HokUTWomjidhZBzCYQCQjeWHWw0e1zxzPPJgugrwD ZHx/OHabjruoyJ6LFV/e9OCJiEfpbi+049Ae3I/wZKG+qjcNqHbc= X-Developer-Key: i=stefandoesinger@gmail.com; a=openpgp; fpr=4F9C2C8728019633893EBBB98CB81F9A72BBA155 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260506_123409_519547_BBAFBAA6 X-CRM114-Status: GOOD ( 17.40 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This is based on the removed zx29 code. A separate (more complicated) patch will re-add the register map to the pl011 serial driver. Reviewed-by: Linus Walleij Signed-off-by: Stefan Dösinger --- Patch changelog: v8: Adjust UART01x_FR_BUSY to match the different ZX UART registers (Sashiko). I am unsure about UART01x_FR_TXFF and my boards do not expose flow control pins to allow me to test if it works. I am unsure about the virtual address. It doesn't seem to matter, as long as it is a valid address. This address is based on the old removed code. Is there a rule-of-thumb physical to virtual mapping I can use to give a sensible default value? --- arch/arm/Kconfig.debug | 12 ++++++++++++ arch/arm/include/debug/pl01x.S | 9 +++++++++ 2 files changed, 21 insertions(+) diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug index 366f162e147d..98d8a5a60048 100644 --- a/arch/arm/Kconfig.debug +++ b/arch/arm/Kconfig.debug @@ -1331,6 +1331,16 @@ choice This option selects UART0 on VIA/Wondermedia System-on-a-chip devices, including VT8500, WM8505, WM8650 and WM8850. + config DEBUG_ZTE_ZX + bool "Kernel low-level debugging via zx29 UART" + select DEBUG_UART_PL01X + depends on ARCH_ZTE + help + Say Y here if you are enabling ZTE zx297520v3 SOC and need + debug UART support. This UART is a PL011 with different + register addresses. The UART for boot messages on zx29 boards + is usually UART1 and is operating at 921600 8N1. + config DEBUG_ZYNQ_UART0 bool "Kernel low-level debugging on Xilinx Zynq using UART0" depends on ARCH_ZYNQ @@ -1545,6 +1555,7 @@ config DEBUG_UART_8250 config DEBUG_UART_PHYS hex "Physical base address of debug UART" + default 0x01408000 if DEBUG_ZTE_ZX default 0x01c28000 if DEBUG_SUNXI_UART0 default 0x01c28400 if DEBUG_SUNXI_UART1 default 0x01d0c000 if DEBUG_DAVINCI_DA8XX_UART1 @@ -1701,6 +1712,7 @@ config DEBUG_UART_VIRT default 0xf31004c0 if DEBUG_MESON_UARTAO default 0xf4090000 if DEBUG_LPC32XX default 0xf4200000 if DEBUG_GEMINI + default 0xf4708000 if DEBUG_ZTE_ZX default 0xf6200000 if DEBUG_PXA_UART1 default 0xf7000000 if DEBUG_SUN9I_UART0 default 0xf7000000 if DEBUG_S3C64XX_UART && DEBUG_S3C_UART0 diff --git a/arch/arm/include/debug/pl01x.S b/arch/arm/include/debug/pl01x.S index c7e02d0628bf..9dcdeed2357d 100644 --- a/arch/arm/include/debug/pl01x.S +++ b/arch/arm/include/debug/pl01x.S @@ -8,6 +8,15 @@ */ #include +#ifdef CONFIG_DEBUG_ZTE_ZX +#undef UART01x_DR +#undef UART01x_FR +#undef UART01x_FR_BUSY +#define UART01x_DR 0x04 +#define UART01x_FR 0x14 +#define UART01x_FR_BUSY (1<<8) +#endif + #ifdef CONFIG_DEBUG_UART_PHYS .macro addruart, rp, rv, tmp ldr \rp, =CONFIG_DEBUG_UART_PHYS -- 2.53.0