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 X-Spam-Level: X-Spam-Status: No, score=-9.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7E3B8C2BA19 for ; Mon, 13 Apr 2020 06:14:06 +0000 (UTC) Received: from vger.kernel.org (unknown [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4AF4120735 for ; Mon, 13 Apr 2020 06:14:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="g7y1bs+B" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4AF4120735 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727700AbgDMGOF (ORCPT ); Mon, 13 Apr 2020 02:14:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.18]:48264 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726138AbgDMGOD (ORCPT ); Mon, 13 Apr 2020 02:14:03 -0400 Received: from mail-pl1-x641.google.com (mail-pl1-x641.google.com [IPv6:2607:f8b0:4864:20::641]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CBA93C0A3BE0 for ; Sun, 12 Apr 2020 23:14:02 -0700 (PDT) Received: by mail-pl1-x641.google.com with SMTP id n24so325681plp.13 for ; Sun, 12 Apr 2020 23:14:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=lwW9dDHboCKlwty3GK0oBbeC2zYSo6LldkhEtYkcgDM=; b=g7y1bs+BFxl81E84mu1n/MJ/hbN3SNQaxrh4Hfg8oyQJ71yxSAn2PL5f+REf6pjCRm QoC1IRJwAma0lavJVbSj8eD7nb+Z0P6bgLtMCexrSmeojZkNvtYU2qhipQ/PO2leUZ3I VWlFtuS5bkBpXuKX8fdNmW7X3DoYZ8W5Z5/U80Q8qTjyNRvpNW8JrkcH1sNFcdQRIoOd Yjxu7WueKR+BZKiHdieCNeH38ILT349Ah60DKdzQjPEsdOx2gXy8HGVm7TCgZks+08uk kUQgkgbllinaeoEYsbwGPyVWOvcvFKoyjdD9FfNzAHJHmzj5tjka//fbMoiBFimLY49E mG+g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=lwW9dDHboCKlwty3GK0oBbeC2zYSo6LldkhEtYkcgDM=; b=Wq92G/yqnHKJoKnIvDs6WFvDJ4fc8qM0stq1T6UTDajBOAGwPBAx8DvFnKydL8MOOF wILcm1igRuwv1AqPmzB+WcRoSjRh5hiKhHg5eSAyYaKwa3T88xWHycWJmAxLTTh/9m/G G1YM8fd4TMVFtvlZHixY7kKGkBuduCe8+51R4nR4f7LW5NSuIJ2OCXUycb0014AAlK/r LsICuxKTX+25AVweUbh6jxm7cyWWI8jm8gN06UhuUXGR6XYwpwumRw9LrcTXLhSyivzI xmSUzjyrPwbASyrsaNSBx26R9cjXhNMncJaECSY25Z8xqzFe4JZwKWqsoioZNknX4qNy hT4g== X-Gm-Message-State: AGi0PuYPZFg3+7AgMfZCss6TsbaTGSxw2lFQBQRMlffAGW+vPbMyi8Uh ytzLglAMSeVmcBJRa4hqIxU= X-Google-Smtp-Source: APiQypIDtWYZGzVQBXG6hKaoTe8SA/lCU1E00DKCRq5BjOV2IquAw6vDL4yTUAe/Tf/CD2tDd5ox5A== X-Received: by 2002:a17:902:6503:: with SMTP id b3mr6797296plk.20.1586758441630; Sun, 12 Apr 2020 23:14:01 -0700 (PDT) Received: from localhost.localdomain ([45.135.186.19]) by smtp.gmail.com with ESMTPSA id w5sm7712645pfw.154.2020.04.12.23.13.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 12 Apr 2020 23:14:01 -0700 (PDT) From: Baolin Wang To: lee.jones@linaro.org, arnd@arndb.de, broonie@kernel.org Cc: baolin.wang7@gmail.com, orsonzhai@gmail.com, zhang.lyra@gmail.com, linux-kernel@vger.kernel.org Subject: [RFC PATCH v2 3/3] soc: sprd: Add Spreadtrum special bits updating support Date: Mon, 13 Apr 2020 14:13:21 +0800 Message-Id: X-Mailer: git-send-email 2.17.1 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The spreadtrum platform uses a special set/clear method to update registers' bits, which can remove the race of updating the global registers between the multiple subsystems. Thus we can register a physical regmap bus into syscon core to support this. Signed-off-by: Baolin Wang --- drivers/soc/Kconfig | 1 + drivers/soc/Makefile | 1 + drivers/soc/sprd/Kconfig | 16 +++++++ drivers/soc/sprd/Makefile | 2 + drivers/soc/sprd/sprd_syscon.c | 76 ++++++++++++++++++++++++++++++++++ 5 files changed, 96 insertions(+) create mode 100644 drivers/soc/sprd/Kconfig create mode 100644 drivers/soc/sprd/Makefile create mode 100644 drivers/soc/sprd/sprd_syscon.c diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig index 425ab6f7e375..8cfbf2dc518d 100644 --- a/drivers/soc/Kconfig +++ b/drivers/soc/Kconfig @@ -23,5 +23,6 @@ source "drivers/soc/versatile/Kconfig" source "drivers/soc/xilinx/Kconfig" source "drivers/soc/zte/Kconfig" source "drivers/soc/kendryte/Kconfig" +source "drivers/soc/sprd/Kconfig" endmenu diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile index 36452bed86ef..7d156a6dd536 100644 --- a/drivers/soc/Makefile +++ b/drivers/soc/Makefile @@ -29,3 +29,4 @@ obj-$(CONFIG_PLAT_VERSATILE) += versatile/ obj-y += xilinx/ obj-$(CONFIG_ARCH_ZX) += zte/ obj-$(CONFIG_SOC_KENDRYTE) += kendryte/ +obj-$(CONFIG_ARCH_SPRD) += sprd/ diff --git a/drivers/soc/sprd/Kconfig b/drivers/soc/sprd/Kconfig new file mode 100644 index 000000000000..38d1f5971a28 --- /dev/null +++ b/drivers/soc/sprd/Kconfig @@ -0,0 +1,16 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# SPRD SoC drivers +# + +menu "Spreadtrum SoC drivers" + depends on ARCH_SPRD || COMPILE_TEST + +config SPRD_SYSCON + tristate "Spreadtrum syscon support" + depends on ARCH_SPRD || COMPILE_TEST + help + Say yes here to add support for the Spreadtrum syscon driver, + which is used to implement the atomic method of bits updating. + +endmenu diff --git a/drivers/soc/sprd/Makefile b/drivers/soc/sprd/Makefile new file mode 100644 index 000000000000..4d7715553cf6 --- /dev/null +++ b/drivers/soc/sprd/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_SPRD_SYSCON) += sprd_syscon.o diff --git a/drivers/soc/sprd/sprd_syscon.c b/drivers/soc/sprd/sprd_syscon.c new file mode 100644 index 000000000000..0cfd43afeaff --- /dev/null +++ b/drivers/soc/sprd/sprd_syscon.c @@ -0,0 +1,76 @@ +//SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020 Spreadtrum Communications Inc. + */ +#include +#include +#include +#include +#include + +#define SPRD_REG_SET_OFFSET 0x1000 +#define SPRD_REG_CLR_OFFSET 0x2000 + +/* + * The Spreadtrum platform defines a special set/clear method to update + * registers' bits, which means it can write values to the register's SET + * address (offset is 0x1000) to set bits, and write values to the register's + * CLEAR address (offset is 0x2000) to clear bits. + * + * This set/clear method can help to remove the race of accessing the global + * registers between the multiple subsystems instead of using hardware + * spinlocks. + */ +static int sprd_syscon_update_bits(void *context, unsigned int reg, + unsigned int mask, unsigned int val) +{ + void __iomem *base = context; + unsigned int set, clr; + + set = val & mask; + clr = ~set & mask; + + if (set) + writel(set, base + reg + SPRD_REG_SET_OFFSET); + + if (clr) + writel(clr, base + reg + SPRD_REG_CLR_OFFSET); + + return 0; +} + +static int sprd_syscon_read(void *context, unsigned int reg, unsigned int *val) +{ + void __iomem *base = context; + + *val = readl(base + reg); + return 0; +} + +static int sprd_syscon_write(void *context, unsigned int reg, unsigned int val) +{ + void __iomem *base = context; + + writel(val, base + reg); + return 0; +} + +static struct regmap_bus sprd_syscon_regmap = { + .fast_io = true, + .reg_write = sprd_syscon_write, + .reg_read = sprd_syscon_read, + .reg_update_bits = sprd_syscon_update_bits, + .val_format_endian_default = REGMAP_ENDIAN_LITTLE, +}; + +static int sprd_syscon_init(void) +{ + syscon_register_phys_regmap_bus(&sprd_syscon_regmap); + + return 0; +} +core_initcall_sync(sprd_syscon_init); + +MODULE_DESCRIPTION("Spreadtrum syscon support"); +MODULE_AUTHOR("Baolin Wang "); +MODULE_LICENSE("GPL v2"); -- 2.17.1