From nobody Mon Dec 15 22:47:17 2025 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 639A9C7EE23 for ; Sun, 11 Jun 2023 13:25:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233486AbjFKNZX (ORCPT ); Sun, 11 Jun 2023 09:25:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56878 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231255AbjFKNZT (ORCPT ); Sun, 11 Jun 2023 09:25:19 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4C2E7BC for ; Sun, 11 Jun 2023 06:25:18 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id DD9636162C for ; Sun, 11 Jun 2023 13:25:17 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C792BC4339C; Sun, 11 Jun 2023 13:25:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1686489917; bh=iGXfXvl/InzCE01L3sj/3r7/25fU+y8vp67ay4WDSZk=; h=From:Date:Subject:References:In-Reply-To:To:From; b=sD1d1xsciU4UF1mPeH58L23UrGpOKJhQk5GEDMz+6hGModQ/HE6OnnrEFJcTa7GMV 7hwFwq8lYECkfqghCj2MY5ssvXEsJMYtFqZiX+StHYim4UFQddL1MgUnFFCrLIt5PZ V04QBMLPwi59BumYyf7C4Z37mU+ye5d6eZsEF/RGd45SBD8Ta7PKQRxmtJPVGOd/hH AotF4/+qpmcA3Yh38c+We+HO5SljXtFU5mo17NOorcg5CrmctAR/W7wder7ToBLncj 57K211Y+BCmCjxqUoL/JHFHmSx6UX44keX7O1WyEbOFQZQSn81wm9BbjyGNtB/KizG si45pb+eDGnCA== From: Mark Brown Date: Sun, 11 Jun 2023 14:25:02 +0100 Subject: [PATCH 1/2] regmap: Provide a ram backed regmap with raw support MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20230610-regcache-raw-kunit-v1-1-583112cd28ac@kernel.org> References: <20230610-regcache-raw-kunit-v1-0-583112cd28ac@kernel.org> In-Reply-To: <20230610-regcache-raw-kunit-v1-0-583112cd28ac@kernel.org> To: linux-kernel@vger.kernel.org, Mark Brown X-Mailer: b4 0.13-dev-bfdf5 X-Developer-Signature: v=1; a=openpgp-sha256; l=5358; i=broonie@kernel.org; h=from:subject:message-id; bh=iGXfXvl/InzCE01L3sj/3r7/25fU+y8vp67ay4WDSZk=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBkhcs58m+HeWH7HY7AiWhG5fOA1XIsYUj4h1lWHnha Emy3/gCJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZIXLOQAKCRAk1otyXVSH0Fn8CA CGIdztpdcZxHw5ek5sxzeUB20CaHawbD3CQLm5mE2Sn4AuyVHgE1OoOTlawyCLNn1+n538YoLwud7+ E2zCUaH/6g+VuMudS7uDrSe6032ZwK6amDcDPyN2anauU+JmXvAe40FbgULzKgMoDsG1ZSfxmQlful OJ5OTMb34omIBUAoP+6hVnzTleeoqUowD9GnCBp0rvKdX0LSgb8tX78M0e/Li47+eg0so2szC7ziKE SlbShUMBwqAzvHTMOyKVcGu13VAGcMneP6yuJaPWMFcUF8lxP/yNThW8Zx6xdk/lAefJpIFMN/WdZN FqN263qa1EvaEjto7p7fEqV8RN/Pg9 X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Provide a simple, 16 bit only, RAM backed regmap which supports raw I/O for use in testing. Signed-off-by: Mark Brown --- drivers/base/regmap/Makefile | 2 +- drivers/base/regmap/internal.h | 8 +++ drivers/base/regmap/regmap-raw-ram.c | 133 +++++++++++++++++++++++++++++++= ++++ 3 files changed, 142 insertions(+), 1 deletion(-) diff --git a/drivers/base/regmap/Makefile b/drivers/base/regmap/Makefile index f6c6cb017200..5fdd0845b45e 100644 --- a/drivers/base/regmap/Makefile +++ b/drivers/base/regmap/Makefile @@ -8,7 +8,7 @@ obj-$(CONFIG_DEBUG_FS) +=3D regmap-debugfs.o obj-$(CONFIG_REGMAP_KUNIT) +=3D regmap-kunit.o obj-$(CONFIG_REGMAP_AC97) +=3D regmap-ac97.o obj-$(CONFIG_REGMAP_I2C) +=3D regmap-i2c.o -obj-$(CONFIG_REGMAP_RAM) +=3D regmap-ram.o +obj-$(CONFIG_REGMAP_RAM) +=3D regmap-ram.o regmap-raw-ram.o obj-$(CONFIG_REGMAP_SLIMBUS) +=3D regmap-slimbus.o obj-$(CONFIG_REGMAP_SPI) +=3D regmap-spi.o obj-$(CONFIG_REGMAP_SPMI) +=3D regmap-spmi.o diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h index 9bd0dfd1e259..d987ce182d22 100644 --- a/drivers/base/regmap/internal.h +++ b/drivers/base/regmap/internal.h @@ -312,6 +312,7 @@ struct regmap_ram_data { unsigned int *vals; /* Allocatd by caller */ bool *read; bool *written; + enum regmap_endian reg_endian; }; =20 /* @@ -326,5 +327,12 @@ struct regmap *__regmap_init_ram(const struct regmap_c= onfig *config, #define regmap_init_ram(config, data) \ __regmap_lockdep_wrapper(__regmap_init_ram, #config, config, data) =20 +struct regmap *__regmap_init_raw_ram(const struct regmap_config *config, + struct regmap_ram_data *data, + struct lock_class_key *lock_key, + const char *lock_name); + +#define regmap_init_raw_ram(config, data) \ + __regmap_lockdep_wrapper(__regmap_init_raw_ram, #config, config, data) =20 #endif diff --git a/drivers/base/regmap/regmap-raw-ram.c b/drivers/base/regmap/reg= map-raw-ram.c new file mode 100644 index 000000000000..c9b800885f3b --- /dev/null +++ b/drivers/base/regmap/regmap-raw-ram.c @@ -0,0 +1,133 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Register map access API - Memory region with raw access +// +// This is intended for testing only +// +// Copyright (c) 2023, Arm Ltd + +#include +#include +#include +#include +#include +#include +#include + +#include "internal.h" + +static unsigned int decode_reg(enum regmap_endian endian, const void *reg) +{ + const u16 *r =3D reg; + + if (endian =3D=3D REGMAP_ENDIAN_BIG) + return be16_to_cpu(*r); + else + return le16_to_cpu(*r); +} + +static int regmap_raw_ram_gather_write(void *context, + const void *reg, size_t reg_len, + const void *val, size_t val_len) +{ + struct regmap_ram_data *data =3D context; + unsigned int r; + u16 *our_buf =3D (u16 *)data->vals; + int i; + + if (reg_len !=3D 2) + return -EINVAL; + if (val_len % 2) + return -EINVAL; + + r =3D decode_reg(data->reg_endian, reg); + memcpy(&our_buf[r], val, val_len); + + for (i =3D 0; i < val_len / 2; i++) + data->written[r + i] =3D true; +=09 + return 0; +} + +static int regmap_raw_ram_write(void *context, const void *data, size_t co= unt) +{ + return regmap_raw_ram_gather_write(context, data, 2, + data + 2, count - 2); +} + +static int regmap_raw_ram_read(void *context, + const void *reg, size_t reg_len, + void *val, size_t val_len) +{ + struct regmap_ram_data *data =3D context; + unsigned int r; + u16 *our_buf =3D (u16 *)data->vals; + int i; + + if (reg_len !=3D 2) + return -EINVAL; + if (val_len % 2) + return -EINVAL; + + r =3D decode_reg(data->reg_endian, reg); + memcpy(val, &our_buf[r], val_len); + + for (i =3D 0; i < val_len / 2; i++) + data->read[r + i] =3D true; + + return 0; +} + +static void regmap_raw_ram_free_context(void *context) +{ + struct regmap_ram_data *data =3D context; + + kfree(data->vals); + kfree(data->read); + kfree(data->written); + kfree(data); +} + +static const struct regmap_bus regmap_raw_ram =3D { + .fast_io =3D true, + .write =3D regmap_raw_ram_write, + .gather_write =3D regmap_raw_ram_gather_write, + .read =3D regmap_raw_ram_read, + .free_context =3D regmap_raw_ram_free_context, +}; + +struct regmap *__regmap_init_raw_ram(const struct regmap_config *config, + struct regmap_ram_data *data, + struct lock_class_key *lock_key, + const char *lock_name) +{ + struct regmap *map; + + if (config->reg_bits !=3D 16) + return ERR_PTR(-EINVAL); + + if (!config->max_register) { + pr_crit("No max_register specified for RAM regmap\n"); + return ERR_PTR(-EINVAL); + } + + data->read =3D kcalloc(sizeof(bool), config->max_register + 1, + GFP_KERNEL); + if (!data->read) + return ERR_PTR(-ENOMEM); + + data->written =3D kcalloc(sizeof(bool), config->max_register + 1, + GFP_KERNEL); + if (!data->written) + return ERR_PTR(-ENOMEM); + + data->reg_endian =3D config->reg_format_endian; + + map =3D __regmap_init(NULL, ®map_raw_ram, data, config, + lock_key, lock_name); + + return map; +} +EXPORT_SYMBOL_GPL(__regmap_init_raw_ram); + +MODULE_LICENSE("GPL v2"); --=20 2.30.2