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Wed, 23 Apr 2025 12:18:41 -0700 (PDT) From: Alexey Charkov Date: Wed, 23 Apr 2025 23:18:32 +0400 Subject: [PATCH 2/3] soc: Add VIA/WonderMedia SoC identification driver 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: <20250423-wmt-soc-driver-v1-2-bd8bf32521c2@gmail.com> References: <20250423-wmt-soc-driver-v1-0-bd8bf32521c2@gmail.com> In-Reply-To: <20250423-wmt-soc-driver-v1-0-bd8bf32521c2@gmail.com> To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Krzysztof Kozlowski Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Alexey Charkov X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1745435922; l=6371; i=alchark@gmail.com; s=20250416; h=from:subject:message-id; bh=DsaNBg7kkCyMfyjSK+lMewVbgSsJc/88OwBkVoIMDfM=; b=DE0AJQzoN3d0lr5J/TlpMJOJnWCf/lankDlc7MJI71gwaU5NW4o0GUBO3lv74bEUeN0M1dmR2 hfmZhBD39pkC2noUGj7WdwEuOuYaF9FVPF5MqEpEICR1YrVcZpTDg2N X-Developer-Key: i=alchark@gmail.com; a=ed25519; pk=ltKbQzKLTJPiDgPtcHxdo+dzFthCCMtC3V9qf7+0rkc= Add a small SOC bus driver to parse the chip ID and revision made available on VIA/WonderMedia SoCs via their system configuration controller's SCC_ID register. This is intended to select appropriate sets of on-chip device quirks at runtime, as it has been found that even within the same SoC version there can be register-incompatible differences, such as with the SDMMC controller on WM8505 rev. A0-A1 vs. rev. A2. The list of SoC versions is compiled from various vendor source dumps and not all of them have corresponding mainline driver support. Some of them also have been seen with varying on-chip markings while sharing the same hardware chip ID's (as is the case with e.g. WM8850 vs. WM8950). In such cases the selection of names to use here among those seen in various source dumps and chip markings was arbitrary. Suggested by Krzysztof at [1] - thanks a lot! [1] https://lore.kernel.org/all/14de236b-e2a7-4bde-986d-1e5ffddd01b4@kernel= .org/ Signed-off-by: Alexey Charkov --- drivers/soc/Kconfig | 1 + drivers/soc/Makefile | 1 + drivers/soc/vt8500/Kconfig | 20 +++++++ drivers/soc/vt8500/Makefile | 2 + drivers/soc/vt8500/wmt-socinfo.c | 121 +++++++++++++++++++++++++++++++++++= ++++ 5 files changed, 145 insertions(+) diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig index 6a8daeb8c4b96cd29d56343b338a423140b89896..37ca3f094f8994c7e9c7c99c3ba= 47d168d41ce30 100644 --- a/drivers/soc/Kconfig +++ b/drivers/soc/Kconfig @@ -28,6 +28,7 @@ source "drivers/soc/tegra/Kconfig" source "drivers/soc/ti/Kconfig" source "drivers/soc/ux500/Kconfig" source "drivers/soc/versatile/Kconfig" +source "drivers/soc/vt8500/Kconfig" source "drivers/soc/xilinx/Kconfig" =20 endmenu diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile index 2037a8695cb2898659a434803dcdfa2d95b1dbd6..777255401252eab554f56bded7f= f8ea5611704bf 100644 --- a/drivers/soc/Makefile +++ b/drivers/soc/Makefile @@ -34,4 +34,5 @@ obj-$(CONFIG_ARCH_TEGRA) +=3D tegra/ obj-y +=3D ti/ obj-$(CONFIG_ARCH_U8500) +=3D ux500/ obj-y +=3D versatile/ +obj-y +=3D vt8500/ obj-y +=3D xilinx/ diff --git a/drivers/soc/vt8500/Kconfig b/drivers/soc/vt8500/Kconfig new file mode 100644 index 0000000000000000000000000000000000000000..2b2350678c3f70297c51f94eb77= 674c01be773d8 --- /dev/null +++ b/drivers/soc/vt8500/Kconfig @@ -0,0 +1,20 @@ +# SPDX-License-Identifier: GPL-2.0-only + +if ARCH_VT8500 || COMPILE_TEST + +menu "VIA/WonderMedia SoC drivers" + +config WMT_SOCINFO + bool "VIA/WonderMedia SoC Information driver" + default ARCH_VT8500 + select SOC_BUS + default ARCH_VT8500 + help + Say yes to support decoding of VIA/WonderMedia system configuration + register information. This currently includes just the chip ID register + which helps identify the exact hardware revision of the SoC the kernel + is running on (to know if any revision-specific quirks are required) + +endmenu + +endif diff --git a/drivers/soc/vt8500/Makefile b/drivers/soc/vt8500/Makefile new file mode 100644 index 0000000000000000000000000000000000000000..05964c5f2890989c1d794af4f5a= f10f849a497bc --- /dev/null +++ b/drivers/soc/vt8500/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_WMT_SOCINFO) +=3D wmt-socinfo.o diff --git a/drivers/soc/vt8500/wmt-socinfo.c b/drivers/soc/vt8500/wmt-soci= nfo.c new file mode 100644 index 0000000000000000000000000000000000000000..81dd6f722ede35150289a0d87cf= 09b95d9446948 --- /dev/null +++ b/drivers/soc/vt8500/wmt-socinfo.c @@ -0,0 +1,121 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright 2025 Alexey Charkov + * Based on aspeed-socinfo.c + */ + +#include +#include +#include +#include +#include +#include +#include + +static struct { + const char *name; + const unsigned long id; +} const chip_id_table[] =3D { + /* VIA */ + { "VT8420", 0x3300 }, + { "VT8430", 0x3357 }, + { "VT8500", 0x3400 }, + + /* WonderMedia */ + { "WM8425", 0x3429 }, + { "WM8435", 0x3437 }, + { "WM8440", 0x3451 }, + { "WM8505", 0x3426 }, + { "WM8650", 0x3465 }, + { "WM8750", 0x3445 }, + { "WM8850", 0x3481 }, + { "WM8880", 0x3498 }, +}; + +static const char *sccid_to_name(unsigned long sccid) +{ + unsigned long id =3D sccid >> 16; + unsigned int i; + + for (i =3D 0 ; i < ARRAY_SIZE(chip_id_table) ; ++i) { + if (chip_id_table[i].id =3D=3D id) + return chip_id_table[i].name; + } + + return "Unknown"; +} + +static const char *sccid_to_rev(unsigned long sccid) +{ + char letter, digit; + + letter =3D (sccid >> 8) & 0xf; + letter =3D (letter - 1) + 'A'; + + digit =3D sccid & 0xff; + digit =3D (digit - 1) + '0'; + + return kasprintf(GFP_KERNEL, "%c%c", letter, digit); +} + +static int __init wmt_socinfo_init(void) +{ + struct soc_device_attribute *attrs; + struct soc_device *soc_dev; + struct device_node *np; + void __iomem *reg; + unsigned long sccid; + const char *machine =3D NULL; + + np =3D of_find_compatible_node(NULL, NULL, "via,scc-id"); + if (!of_device_is_available(np)) { + of_node_put(np); + return -ENODEV; + } + + reg =3D of_iomap(np, 0); + if (!reg) { + of_node_put(np); + return -ENODEV; + } + sccid =3D readl(reg); + iounmap(reg); + + attrs =3D kzalloc(sizeof(*attrs), GFP_KERNEL); + if (!attrs) + return -ENODEV; + + /* + * Machine: VIA APC Rock + * Family: WM8850 + * Revision: A2 + * SoC ID: raw silicon revision id (0x34810103) + */ + + np =3D of_find_node_by_path("/"); + of_property_read_string(np, "model", &machine); + if (machine) + attrs->machine =3D kstrdup(machine, GFP_KERNEL); + of_node_put(np); + + attrs->family =3D sccid_to_name(sccid); + attrs->revision =3D sccid_to_rev(sccid); + attrs->soc_id =3D kasprintf(GFP_KERNEL, "%08lx", sccid); + + soc_dev =3D soc_device_register(attrs); + if (IS_ERR(soc_dev)) { + kfree(attrs->machine); + kfree(attrs->soc_id); + kfree(attrs->revision); + kfree(attrs); + return PTR_ERR(soc_dev); + } + + pr_info("VIA/WonderMedia %s rev %s (%s)\n", + attrs->family, + attrs->revision, + attrs->soc_id); + + return 0; +} +early_initcall(wmt_socinfo_init); --=20 2.49.0