From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5B40D49CF40; Tue, 6 Oct 2026 18:17:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791310662; cv=none; b=UHguhcuSQvg4yhi6NnW5RBy+PSbsPY5t2bCqGqG3MDAEhrLubGopMibB31Ad2RkmDi9SP4XogIeMgCuBW1fCKw7oNMw/sS0WsMspoOEN0bPlLcIh6CY9eShxUJ0SMh/yI/z1cG1zOzRyI3xiF7JvuuuuERagSIbzSxqBLLwWqUY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791310662; c=relaxed/simple; bh=c19LaHI3cqGeWOYYHaqupTRfxRQfQ3vM+xMhd/XhZOI=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=C0IJoMbSYoaMZzMolbMiLoTOxKuDZ0BJfF8iPdTorkoTFwr2/4b1x7IejWxGxUsnfoQsMHogm7gZj5iekXUSfaxVSWu6z2xpC198w4VE4aDGwkMUTl/jIqnPS4kUDn8a1jXnXpp6vMfpt0waTf2H+3Zj4DeU0KXeNQG3+Xu2IKc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OX6Onhlk; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="OX6Onhlk" Received: by smtp.kernel.org (Postfix) with ESMTPS id 1D49FC4DDE9; Tue, 6 Oct 2026 18:17:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1791310662; bh=c19LaHI3cqGeWOYYHaqupTRfxRQfQ3vM+xMhd/XhZOI=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=OX6OnhlkLVhwwfMaF3+0ABEj8T80pJQ3KowY++9nXuODaeHuHRjdGV1c+vUvtDFv7 yu8u7rV5O95yoJ2TQXLUT4N7N66A2A1QLsVHzVmxPuTnmsUl0lhEPvI8zx4nLee0mk BkPIKFH4991lm5YT40SnRYt9lBlzxpjv79B3T2rDTR0mmLr8Mpx/6vjCoLzsCR5SnU DkpeVtDh3Eub/4apqwTD801VOhlTx5I6YzwYpjQJByhz7fJR97Agw8gjXO09MyUXTn zTv7j1HsdUKsUxJvu8U6g8jKaI+ZJBjrX8bFMb6lMtZqHqfu1siIyr/w5H6eKrwTsC GjrqhXtfyyu1w== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0609ECA6007; Tue, 6 Oct 2026 18:17:42 +0000 (UTC) From: Fil Dunsky via B4 Relay Date: Tue, 06 Oct 2026 21:17:42 +0300 Subject: [PATCH RFC v2 04/10] ARM: goldengate: Add support for the CS75xx SoC family 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: 7bit Message-Id: <20261006-b4-cs75xx-v2-4-b7d6e1e24d44@gmail.com> References: <20261006-b4-cs75xx-v2-0-b7d6e1e24d44@gmail.com> In-Reply-To: <20261006-b4-cs75xx-v2-0-b7d6e1e24d44@gmail.com> To: Arnd Bergmann , Linus Walleij , Krzysztof Kozlowski Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Greg Kroah-Hartman , Jiri Slaby , Russell King , Alexandre Belloni , Drew Fustini , Lorenzo Pieralisi , linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, Jason Li , Fil Dunsky X-Mailer: b4 0.16.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1791310660; l=5987; i=filipp.dunsky@gmail.com; s=20260930; h=from:subject:message-id; bh=AzNWE2baVafHzkNdLx0zx4waCWh7ilySOdAnW5XR5+E=; b=isPwfUsi/iD5IMLLj5oKk8AD8iq7e1+JKCODggC/2sktLHS6srv6EJ5c8ZtE7Pyl6q/ZissaT l4bjPlW8wTkBOGmDeK6vz9d74/Z1FIINZlo8xSt9PnAryH4oV8hwjxk X-Developer-Key: i=filipp.dunsky@gmail.com; a=ed25519; pk=JAYP8e2rJ54DHOmhNtXud8rl1igAaAXoOHxtJmVXI1g= X-Endpoint-Received: by B4 Relay for filipp.dunsky@gmail.com/20260930 with auth_id=1085 X-Original-From: Fil Dunsky Reply-To: filipp.dunsky@gmail.com From: Fil Dunsky The Cortina Systems CS75xx ("Goldengate G2") are network processors with two Cortex-A9 cores, an SCU, GIC, the Cortex-A9 global and private timers and a PL310 L2 cache controller. The family includes at least the CS7522 and the CS7542; the CS7542 is used, among others, in the Securifi Almond+ router. Apart from the vendor this has little in common with the Cortina Systems Gemini (SL3516/CS3516) supported by mach-gemini: Gemini is a single ARMv4 FA526 with Faraday peripherals (FTINTC010, FTTMR010, FTGPIO010, a 16550 UART) built for ARCH_MULTI_V4, while the CS75xx is an ARMv7 MPCore whose UART, GPIO, interrupt controller and NAND controller are different blocks. It therefore gets its own directory, named after the Goldengate codename like in the vendor kernel. The Kconfig symbol, ARCH_CORTINA_ACCESS, covers the whole family and is named after Cortina Access, which last sold these chips and also makes the newer 64-bit parts. The generic DT machine is sufficient for the platform, so only the SMP bring-up needs code: the bootloader parks the secondary core in a WFE loop that polls a global software register, so boot it by writing the physical address of secondary_startup to the register named by the cpu-release-addr property and issuing SEV. The CPU is a Cortex-A9 r2p1, so select the errata workarounds that apply to that revision and can be enabled on a multiplatform kernel. The PL310 is r3p2 and needs none of the PL310 workarounds. Signed-off-by: Fil Dunsky --- arch/arm/Kconfig | 2 ++ arch/arm/Makefile | 1 + arch/arm/mach-goldengate/Kconfig | 18 ++++++++++ arch/arm/mach-goldengate/Makefile | 2 ++ arch/arm/mach-goldengate/platsmp.c | 71 ++++++++++++++++++++++++++++++++++++++ 5 files changed, 94 insertions(+) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 0cc289a7184..87ff6525648 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -391,6 +391,8 @@ source "arch/arm/mach-footbridge/Kconfig" source "arch/arm/mach-gemini/Kconfig" +source "arch/arm/mach-goldengate/Kconfig" + source "arch/arm/mach-highbank/Kconfig" source "arch/arm/mach-hisi/Kconfig" diff --git a/arch/arm/Makefile b/arch/arm/Makefile index 573813ef5e7..21d7a443cf7 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -187,6 +187,7 @@ machine-$(CONFIG_ARCH_DOVE) += dove machine-$(CONFIG_ARCH_EXYNOS) += exynos machine-$(CONFIG_ARCH_FOOTBRIDGE) += footbridge machine-$(CONFIG_ARCH_GEMINI) += gemini +machine-$(CONFIG_ARCH_CORTINA_ACCESS) += goldengate machine-$(CONFIG_ARCH_HIGHBANK) += highbank machine-$(CONFIG_ARCH_HISI) += hisi machine-$(CONFIG_ARCH_IXP4XX) += ixp4xx diff --git a/arch/arm/mach-goldengate/Kconfig b/arch/arm/mach-goldengate/Kconfig new file mode 100644 index 00000000000..d2963df0aee --- /dev/null +++ b/arch/arm/mach-goldengate/Kconfig @@ -0,0 +1,18 @@ +# SPDX-License-Identifier: GPL-2.0-only +config ARCH_CORTINA_ACCESS + bool "Cortina Systems CS75xx (Goldengate G2)" + depends on ARCH_MULTI_V7 + select ARM_ERRATA_754322 + select ARM_ERRATA_764369 if SMP + select ARM_GIC + select ARM_GLOBAL_TIMER + select CACHE_L2X0 + select CLKSRC_ARM_GLOBAL_TIMER_SCHED_CLOCK + select HAVE_ARM_SCU if SMP + select HAVE_ARM_TWD if SMP + help + Support for the Cortina Systems CS75xx (Goldengate G2) family of + network processors, such as the CS7542 used in the Securifi + Almond+ router. These SoCs have two Cortex-A9 cores with a PL310 + L2 cache controller, a packet processing engine, PCIe, NAND and + the usual low speed peripherals. diff --git a/arch/arm/mach-goldengate/Makefile b/arch/arm/mach-goldengate/Makefile new file mode 100644 index 00000000000..b839201c980 --- /dev/null +++ b/arch/arm/mach-goldengate/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_SMP) += platsmp.o diff --git a/arch/arm/mach-goldengate/platsmp.c b/arch/arm/mach-goldengate/platsmp.c new file mode 100644 index 00000000000..7cd23ee56be --- /dev/null +++ b/arch/arm/mach-goldengate/platsmp.c @@ -0,0 +1,71 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * SMP support for the Cortina Systems CS75xx SoCs + * + * The bootloader parks the secondary core in a WFE loop that polls a + * global software register and jumps to the address found there once it + * becomes non-zero. The register is described by the cpu-release-addr + * property of the secondary CPU node. + */ + +#include +#include +#include +#include +#include +#include + +static int cs75xx_boot_secondary(unsigned int cpu, struct task_struct *idle) +{ + struct device_node *np; + void __iomem *release; + u64 addr; + int ret; + + np = of_get_cpu_node(cpu, NULL); + if (!np) + return -ENODEV; + + ret = of_property_read_u64(np, "cpu-release-addr", &addr); + of_node_put(np); + if (ret) { + pr_err("CPU%u: missing cpu-release-addr\n", cpu); + return ret; + } + + release = ioremap(addr, sizeof(u32)); + if (!release) + return -ENOMEM; + + writel(__pa_symbol(secondary_startup), release); + iounmap(release); + + /* The secondary core waits in WFE, wake it up */ + dsb_sev(); + + return 0; +} + +static void __init cs75xx_smp_prepare_cpus(unsigned int max_cpus) +{ + struct device_node *np; + void __iomem *scu_base; + + np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu"); + scu_base = of_iomap(np, 0); + of_node_put(np); + if (!scu_base) { + pr_err("failed to map SCU\n"); + return; + } + + scu_enable(scu_base); + iounmap(scu_base); +} + +static const struct smp_operations cs75xx_smp_ops __initconst = { + .smp_prepare_cpus = cs75xx_smp_prepare_cpus, + .smp_boot_secondary = cs75xx_boot_secondary, +}; + +CPU_METHOD_OF_DECLARE(cs7542_smp, "cortina,cs7542-smp", &cs75xx_smp_ops); -- 2.53.0