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 DFEDACD37AC for ; Wed, 13 May 2026 21:35:15 +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=Ds1PEsn4N7p0GlSYhiFUcNXWLm V2DIG9LL6DD+09DpFNJ1D9roEnVaHqb+UdtJIo1TrVeyZL+spiHWEkBTLsSkiG39YHjdJudhJt5iO cyv5ZDVoP3a/Jv2qnphmkig/UU23cu7E9fA+Rvl295hpM9tK8q3GQ5VpF7Gxlgd9kqGo3vtizqNXo Sc/qZDZU6xPYeTYbUrwfVdUpyC+dzctk9yRwtpIpAtYbeqHVGJK8KlMy20sAiC+ut23/ZzVLE/Acq CGNGVvgGZ3CW0kuJEGLuIOig0CU2eyOp7DTzJglxsSG1IcUqEiFFqQ+MqiuWlagIQbNkZSI5uKij0 7EEyqArg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wNHET-00000003q2T-0MXh; Wed, 13 May 2026 21:35:09 +0000 Received: from mail-wm1-x329.google.com ([2a00:1450:4864:20::329]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wNHEQ-00000003q0D-1og5 for linux-arm-kernel@lists.infradead.org; Wed, 13 May 2026 21:35:07 +0000 Received: by mail-wm1-x329.google.com with SMTP id 5b1f17b1804b1-488a88aeec9so81264635e9.2 for ; Wed, 13 May 2026 14:35:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1778708105; x=1779312905; 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=iTBnDwEE2Aa+Cg+Vf/bJj5l6o836bTGSjt2z4iFF/zfs6voG9JqeTV4JXtKGHSnAr1 aY3NBUSTnHXwazgPMJORqY81lySyW0HnpRJTSBHJngaxnMBT7igOgjw4+f3yTIj4237b tGU9Mqjwz27tfuCaixCm2h9yCQBLZYNxKYpXfUumsd73tEdi1JQlBETjhh5ii5gAAnWe k7jf7PnBq6H/txylKWwpJZZeex3W9dtIwxkAHt1tJqaM74EhtRkTNyHtbTWXt9WI201Q yWBT+OJtP/DcB7linsXrPDZDXPIIvx7uRfXCTn7u31CUSo/Ma67wTZo6Nmyb2UPM9Ph1 HIng== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1778708105; x=1779312905; 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=RoLpx2Mr6GwUQ3JhnVRV5tnyZjDE/lLLUqkOLRJOXT6GIOtpeUJOylr9qN5Giulipd jtf9gwBFpZY6lHHQIAqgWIvVjCJ0M5m9l+Jeqvcl4ev8xRUKAA0HeSJ6P2Yz4U4NjcOe isU0tjyXUn/g06UvJ+58dZcyyfu7o2k8EhpeFFtB0qi+vLYSdLRF3rFEx7IaC7WBDmKI m59MO8I+i/VNchCh/qp/mVScypk+M7oz1H2P6XfW5RbPOPW/Ow8eMSNUfLIqyK5IEZQi LB9UbrbGjMbERLaNw8llrsU3F7wuyXJlxx/bJ1uUe0RV8W6dfgcfg3565G2JOx9bqoq5 ttZQ== X-Gm-Message-State: AOJu0Yz2fLF6UrfxcwvOEldc7qbLvguc6m/JYpfaaAm1KyfzPOVay2X+ hCS80kC7MSTo4xt+h7ygSJEGtzxEyqOdeaLleUXMrYoXTOk/8hmrTQMV X-Gm-Gg: Acq92OFgb9GQD34myvqvT4o9RBc/3aAQ9XNP48UGa/ynePzVvmR01vNWlUGy+iCbI8O Anqa9E5dB4KFWqCRLqvGCHUtzqJVmIwdjp8h3VsX5gU8Ng+cZfpNwnhBwqoHdmlN4paVYKDbUOX CYm0UWQly+GAzR397r4O7nFfOMftiC3Et67K27kiSy8lUBIMbT8Fr5C6dzljihHBRJFCJzBpcDu TqyN+HADqgHLd+p021FTSdkW0CdcatcXBAtORlse/tWUThGBT8k3JEh7PLU9jIuBwq/3BRXNRFw AJ9XAtTLQQ92CL0FD0MYlXk1ekWd/VZ6V4+lCEgVkgGDqOHv58cB338mVGd34AkXWdEkSV8szsq Fj64OTp5gxn311QukYRFMN0mL9LKNLkHsu+KoCo4q3OusPdAmT9aVQDPpSIujBKI/ybeTqt3y0y I0BOoGiKJjdOh0nccfHTfKfMUlVmNf++5LJYXKKW1949s= X-Received: by 2002:a05:600c:4fcb:b0:48e:5d91:cffb with SMTP id 5b1f17b1804b1-48fc9a0f637mr70497135e9.10.1778708104526; Wed, 13 May 2026 14:35:04 -0700 (PDT) Received: from [192.168.0.2] ([197.250.51.99]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48fdb1fee9csm2553055e9.0.2026.05.13.14.35.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 May 2026 14:35:04 -0700 (PDT) From: =?utf-8?q?Stefan_D=C3=B6singer?= Date: Thu, 14 May 2026 00:34:56 +0300 Subject: [PATCH 1/2] 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: <20260514-zx29uart-v1-1-68470ecc3977@gmail.com> References: <20260514-zx29uart-v1-0-68470ecc3977@gmail.com> In-Reply-To: <20260514-zx29uart-v1-0-68470ecc3977@gmail.com> To: Russell King , Greg Kroah-Hartman , Jiri Slaby Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, =?utf-8?q?Stefan_D=C3=B6singer?= , Linus Walleij 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/ZANAwAIAT0TvMhUTxoiAcsmYgBqBO6DHrxaXkARBemDDkrBXpRS3oDZcwST0k/6L QLZOUY6KB+JAk8EAAEIADkWIQRDFvS2qgVbJ5UyXWw9E7zIVE8aIgUCagTugxsUgAAAAAAEAA5t YW51MiwyLjUrMS4xMiwyLDIACgkQPRO8yFRPGiJwjg//XTrdw6+H+63UW2tqzNvWFZC4aWlyYUj gjO5KfX3MtxNMlzZPWOaHkRmJ6iIfTMtSzw0HVwWP8qpWmyauwAyXiVkiSb/cYBR+zTDOCKh8ct 2O4/xKK/IxkSkqRJpZFZKUVxPHj96SwxDRx+XljqC2wPPlG2otentnHSTQBnME/vCXr21QqlX2d oMn/b3jzcNV5QL5RnBowJT0eG54v7ImmhvtP7D/NmVYP341gctaRixem8tVc5VNDcLZQCTUX6/Z jBZg7B5gOsBAe9367QIzSIYsIQ8mGWggHslNjUVnnCHF1wFVJBcfKFiGDa0davUavrGKwpmvLpf i93Rj1OnEPKMqp1LVXhgehpD4nXBFgXUSLaHSggtnRK5IdIfm9VHSX5VTGM/Gy4gSTxy70APCTX z0OpWcnd+RoFpWF0R2G7l07WtpRE/f1KdpogeWPz93/gK1+q9l5j6/1ar51/DFaS/ILJeQuokEV 3uoOf4WZF24/O3/nm3WcdjLRalLqAKvDj4UWFnHVoZ7juBtaOIaP+7NMAyVduI9WJ0GnCHyHUC9 tqjHKhEVWLebrkNuv4zFtLz5BmtgBbTyRhhGbMTJKIgdRDuMbNWq2Hy8XR7ZQpPXWwKx+VM2Jaj o1YS12nYo9yXnK3LtuDuvApaJ3Bb7g9H555OERinTF5PknMfisFk= 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-20260513_143506_510336_698C6134 X-CRM114-Status: GOOD ( 16.56 ) 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