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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 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable 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 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 D=C3=B6singer --- 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. =20 + 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 =20 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 =20 +#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, =3DCONFIG_DEBUG_UART_PHYS --=20 2.53.0 From nobody Fri Jun 12 15:57:54 2026 Received: from mail-wm1-f54.google.com (mail-wm1-f54.google.com [209.85.128.54]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2F1C13BFAF7 for ; 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a=openpgp; fpr=4F9C2C8728019633893EBBB98CB81F9A72BBA155 This is based on code removed in commit 89d4f98ae90d ("ARM: remove zte zx platform"). I did not bring back the zx29-uart .compatible as the arm,primecell-periphid does the job. Reviewed-by: Linus Walleij Signed-off-by: Stefan D=C3=B6singer --- Changes since v4: Use ZTE's JEDEC ID instead of 0xfe for the DT-Provided AMBA ID. --- drivers/tty/serial/amba-pl011.c | 42 +++++++++++++++++++++++++++++++++++++= ++++ 1 file changed, 42 insertions(+) diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl01= 1.c index 028e37ad8d79..8ed91e1da22b 100644 --- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -240,6 +240,38 @@ static struct vendor_data vendor_nvidia =3D { .get_fifosize =3D get_fifosize_nvidia, }; =20 +static const u16 pl011_zte_offsets[REG_ARRAY_SIZE] =3D { + [REG_DR] =3D ZX_UART011_DR, + [REG_FR] =3D ZX_UART011_FR, + [REG_LCRH_RX] =3D ZX_UART011_LCRH, + [REG_LCRH_TX] =3D ZX_UART011_LCRH, + [REG_IBRD] =3D ZX_UART011_IBRD, + [REG_FBRD] =3D ZX_UART011_FBRD, + [REG_CR] =3D ZX_UART011_CR, + [REG_IFLS] =3D ZX_UART011_IFLS, + [REG_IMSC] =3D ZX_UART011_IMSC, + [REG_RIS] =3D ZX_UART011_RIS, + [REG_MIS] =3D ZX_UART011_MIS, + [REG_ICR] =3D ZX_UART011_ICR, + [REG_DMACR] =3D ZX_UART011_DMACR, +}; + +static unsigned int get_fifosize_zte(struct amba_device *dev) +{ + return 16; +} + +static struct vendor_data vendor_zte =3D { + .reg_offset =3D pl011_zte_offsets, + .access_32b =3D true, + .ifls =3D UART011_IFLS_RX4_8 | UART011_IFLS_TX4_8, + .fr_busy =3D ZX_UART01x_FR_BUSY, + .fr_dsr =3D ZX_UART01x_FR_DSR, + .fr_cts =3D ZX_UART01x_FR_CTS, + .fr_ri =3D ZX_UART011_FR_RI, + .get_fifosize =3D get_fifosize_zte, +}; + /* Deals with DMA transactions */ =20 struct pl011_dmabuf { @@ -3180,6 +3212,16 @@ static const struct amba_id pl011_ids[] =3D { .mask =3D 0x000fffff, .data =3D &vendor_nvidia, }, + { + /* This is an invented ID. The actual hardware that contains + * these ZTE UARTs (zx29 boards) has no AMBA PIDs stored. ZTE + * JEDEC ID (ignoring banks) and the "011" part number as used + * by ARM. + */ + .id =3D 0x0008c011, + .mask =3D 0x000fffff, + .data =3D &vendor_zte, + }, { 0, 0 }, }; =20 --=20 2.53.0