From patchwork Sat Jun 30 13:33:25 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 140675 Delivered-To: patch@linaro.org Received: by 2002:a2e:9754:0:0:0:0:0 with SMTP id f20-v6csp2000791ljj; Sat, 30 Jun 2018 06:34:13 -0700 (PDT) X-Google-Smtp-Source: ADUXVKIHsKAIHQWA87Ft5rauktcfNmTUjR4CFRgFYKnWOk/divBB4Srg/WLV3/xbj0sMWSBFi9Tb X-Received: by 2002:a17:902:6802:: with SMTP id h2-v6mr18674790plk.113.1530365653743; Sat, 30 Jun 2018 06:34:13 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1530365653; cv=none; d=google.com; s=arc-20160816; b=u96mEN94M1arwh5ukioMbq/6FNOS5rq74rIrFdMmATuFfEKRWcaCWeKqoYgraHzKpz lHgMniLMoUswyjsuETSZoyGLsuFA5Jthj8RvOh1tqreFEV4McRn87kU0x6GpM/rBdZ5O 1bGVphbm4XfzgUdLBgOALhReqY9hmAzRJAln5bL6AT860h7V6yFDOhstGMB9pyxl2/z8 fojrM6RegDvM7PXJg+nRaOGFAnNxm2hjwsLCKKc0p0fTf8OB/Vd0GC00/qu7TpMi7pCI iyhHWb4eKL9a4u0SiY4Hpkppj0ShmPJKK6+Mn9krPFByzSMpTD7fG/q0L+UI2Fdk0JVT 9//g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:references:in-reply-to:message-id:date :subject:cc:to:from:dkim-signature:arc-authentication-results; bh=P3sErEIs2TdQVU1vCbLuXOpei3kXzzcqD58jTzbNExU=; b=mdKwB6t31Gc2DcM/M6lT80s46nGltQKVZ0DiTK0a1nl9lkGrQSHSsF3fBUpNz9DqbX +4SKnYrNfbLLXSTgZRwpnHnGoaMoV3BSjaC0cZ+QQ9241tYoNlf6aNSlNlk9hHdtOdDc of80vocSzVaJE8cwIHYEx/kocQqsD/uBqOiTbqsaeAmuVGqaNB31BBniZs0gGOb0xL3z 1GeZ1pWzgLc2l0v46NC5K9c9I/UfXMxcp21uPflRg4n43v3lg/va5lilroiKfFuyF+ut 0BicQ2rEgEqGSA7asHoLpPyWqqXY3u4gRUYHY0dFo1xMPZxWAkllusH+EzFs/qxqHLHG 8mPQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=YjTKDmE4; spf=pass (google.com: best guess record for domain of linux-i2c-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-i2c-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id o123-v6si4086165pgo.190.2018.06.30.06.34.13; Sat, 30 Jun 2018 06:34:13 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-i2c-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=YjTKDmE4; spf=pass (google.com: best guess record for domain of linux-i2c-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-i2c-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751096AbeF3NeD (ORCPT + 2 others); Sat, 30 Jun 2018 09:34:03 -0400 Received: from mail-pl0-f67.google.com ([209.85.160.67]:40038 "EHLO mail-pl0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751060AbeF3Nd5 (ORCPT ); Sat, 30 Jun 2018 09:33:57 -0400 Received: by mail-pl0-f67.google.com with SMTP id t6-v6so5800419plo.7 for ; Sat, 30 Jun 2018 06:33:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=P3sErEIs2TdQVU1vCbLuXOpei3kXzzcqD58jTzbNExU=; b=YjTKDmE4YaMqwRk6V3v7r9XY4w3noRKkarDChMw1xBVbWHgNR2k6XknTw0g0MQazO1 BttlBO+FdjP5f1p+yKMPR3c93d/76Tx1DdNMl5EFj69k7gEED7aYJYYD355Ry6B/k47u Q5TJXdVof4VD46xJvbKXBY1VJgaW2BYU2Kmrg= 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; bh=P3sErEIs2TdQVU1vCbLuXOpei3kXzzcqD58jTzbNExU=; b=P/8+tUYB6r1iG+ngDu908OgAHjA5Q+vvK1jmaI4fBqzJmhiBDmrRuu8lo9Mg4UVypb aW31SoeveZeVe7eIfO+TQ9ObYTi7b52sDHCCjpoQYbAY0a1spD7XelJ+KZ86wbIsyDZC Pse1MX2iHgCCZTdQkYpKox0I01s2jtQKhFgQFWgNTdOKKpGjvEZJmwhRbD3fVqA3Vdrq jnYaVr0a1Lmqq+G7tB2pmPsIJSEijWQATij0qMx5S6l6Ryb4E5MnKc8ZCGkqaebIcds4 HDGwwnQ689Qw50Uyqzh8AIpwcyYcT2KCVfSQd4cD+i+Z3CjGTd4KJG0lhYwOzJOuIJE7 KGlg== X-Gm-Message-State: APt69E0Qb+oWaU3BN8EXsbXebc0xPmjpppLF6OlW5bGhNtrupeulHzBD qGbKecPsZ4Vp1v505IF3bMhe X-Received: by 2002:a17:902:3303:: with SMTP id a3-v6mr18890105plc.209.1530365637165; Sat, 30 Jun 2018 06:33:57 -0700 (PDT) Received: from localhost.localdomain ([2405:204:73ca:b257:2c06:3367:1893:796]) by smtp.gmail.com with ESMTPSA id m10-v6sm18738778pgq.89.2018.06.30.06.33.48 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 30 Jun 2018 06:33:56 -0700 (PDT) From: Manivannan Sadhasivam To: wsa@the-dreams.de, robh+dt@kernel.org, afaerber@suse.de Cc: linus.walleij@linaro.org, linux-i2c@vger.kernel.org, liuwei@actions-semi.com, mp-cs@actions-semi.com, 96boards@ucrobotics.com, devicetree@vger.kernel.org, andy.shevchenko@gmail.com, daniel.thompson@linaro.org, amit.kucheria@linaro.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, hzhang@ucrobotics.com, bdong@ucrobotics.com, manivannanece23@gmail.com, thomas.liau@actions-semi.com, jeff.chen@actions-semi.com, Manivannan Sadhasivam Subject: [PATCH v3 1/6] dt-bindings: i2c: Add binding for Actions Semiconductor Owl I2C controller Date: Sat, 30 Jun 2018 19:03:25 +0530 Message-Id: <20180630133330.23858-2-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180630133330.23858-1-manivannan.sadhasivam@linaro.org> References: <20180630133330.23858-1-manivannan.sadhasivam@linaro.org> Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Add devicetree binding for Actions Semiconductor Owl I2C controller Signed-off-by: Manivannan Sadhasivam --- .../devicetree/bindings/i2c/i2c-owl.txt | 27 +++++++++++++++++++ 1 file changed, 27 insertions(+) create mode 100644 Documentation/devicetree/bindings/i2c/i2c-owl.txt -- 2.17.1 diff --git a/Documentation/devicetree/bindings/i2c/i2c-owl.txt b/Documentation/devicetree/bindings/i2c/i2c-owl.txt new file mode 100644 index 000000000000..b743fe444e9f --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/i2c-owl.txt @@ -0,0 +1,27 @@ +Actions Semiconductor Owl I2C controller + +Required properties: + +- compatible : Should be "actions,s900-i2c". +- reg : Offset and length of the register set for the device. +- #address-cells : Should be 1. +- #size-cells : Should be 0. +- interrupts : A single interrupt specifier. +- clocks : Phandle of the clock feeding the I2C controller. + +Optional properties: + +- clock-frequency : Desired I2C bus clock frequency in Hz. As only Normal and + Fast modes are supported, possible values are 100000 and + 400000. +Examples: + + i2c0: i2c@e0170000 { + compatible = "actions,s900-i2c"; + reg = <0 0xe0170000 0 0x1000>; + #address-cells = <1>; + #size-cells = <0>; + interrupts = ; + clocks = <&clock CLK_I2C0>; + clock-frequency = <100000>; + }; From patchwork Sat Jun 30 13:33:29 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 140679 Delivered-To: patch@linaro.org Received: by 2002:a2e:9754:0:0:0:0:0 with SMTP id f20-v6csp2001243ljj; Sat, 30 Jun 2018 06:34:46 -0700 (PDT) X-Google-Smtp-Source: AAOMgpfyI8xraSfmR4jNU6PxN8+Cth6GjZBmO9Y9egSsWW0w3+BQowOOJ1h+NuCoBSclFy1ZEprx X-Received: by 2002:a65:4b04:: with SMTP id r4-v6mr10428281pgq.175.1530365686757; Sat, 30 Jun 2018 06:34:46 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1530365686; cv=none; d=google.com; s=arc-20160816; b=NxwNg8/wQuaO/S9FACDrN7XCyJZtovZiS9em7PDPRTE8JusCnsQNL+3F5ZOtrwABJj iMOygK42/8FsUA5GM8bdqpxuCndEr88xorelf8dKuCNriaPlon4Ze1jRqxEru2tOR6hb KKnEUTwoZrLWzWJ289hYzuR1wY8VI43tZ1Rt8DGy5/8T5hfuv2hrULeupeIH8yK8tijr bDucR+G4xaw0r67l7dqeCPxmBlxRTwU7UvKs5HUU3haBi4RdOI4Gr2m/Aaqex8WZgmTt fPA7dKA3y47p70EzHpILK/wMnjWV9xFqFrop336IfeSrnWbyKGqxRb2f99CHY9QpMj9W EwPQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:references:in-reply-to:message-id:date :subject:cc:to:from:dkim-signature:arc-authentication-results; bh=4V7VDi6R0bVDt5vsOMtpTh+WYXj4pGp6Vo5xXi7xuK8=; b=F/lRNIFTI8TovXGt3WNf93u6vLbu2QatRKnoo0QSc3/JZR2/8+FtgpwjOcj/DPZyBC PKzaS82WlvQt9xjpnlgRTfk7GAfCiKhwu8xWqn0KdHLJY5hD76IV7MdYKdFehMXkhleH ozk85x3foiL+o7wTMwmokU5fnfSXDETa9T2EEtOxmvmfsu/MfWKXHhGt/H9e0siHTewA xVsHo1Fis8tQVA0I7UETfAOonTnhquKEFlCqzdztBu0jWGAanT1Zdo0a7MjHB0RdO7PU kWddsy5fvRuLCUXC9ZaCiRIlx9ghUmZVOWmb2VWTf3M5wgooLxGgy7xkYC3EjOfy6BeR LXLQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=fr59eYKe; spf=pass (google.com: best guess record for domain of linux-i2c-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-i2c-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id l81-v6si13122487pfa.368.2018.06.30.06.34.46; Sat, 30 Jun 2018 06:34:46 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-i2c-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=fr59eYKe; spf=pass (google.com: best guess record for domain of linux-i2c-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-i2c-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751483AbeF3Nep (ORCPT + 2 others); Sat, 30 Jun 2018 09:34:45 -0400 Received: from mail-pg0-f66.google.com ([74.125.83.66]:40680 "EHLO mail-pg0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751469AbeF3Nei (ORCPT ); Sat, 30 Jun 2018 09:34:38 -0400 Received: by mail-pg0-f66.google.com with SMTP id w8-v6so5181439pgp.7 for ; Sat, 30 Jun 2018 06:34:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=4V7VDi6R0bVDt5vsOMtpTh+WYXj4pGp6Vo5xXi7xuK8=; b=fr59eYKeiZgA9ukZbQhtWuPcDnNjBe9A/qah8i99unkEuMfS52FQlWTuSJE69Rop8Z oePIOatYJyqLegmtCUjLzO/OcqNffW643+s2TzzC75L9cM8FEtDGKMl0gdOrIIZM63Iy TMNg+EJwj7gHw4xsazZIGrcQcoRIfhBsCfVD0= 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; bh=4V7VDi6R0bVDt5vsOMtpTh+WYXj4pGp6Vo5xXi7xuK8=; b=aFIks43Uy2ANtvNOeLbqfOz8hT02UnyLgA32yActyoCesVzTdhNYh59QuCYrDoseR6 PtcNPM3TFCckmmhuNmcjDLI2qUaSsSr3RG01eRnOn9XrIiOnWFAIJ/GInu5eXt0Ksil+ I97V0LuWvBoJ41eT471uFppmQyWd3Z7kH2noQaYYfpE83/Q3upNpmsZ7+iHPtdhZQWf5 A7V6+yNZaR8MyMWNOQr/kgLZlKs0dLKDPrMPIno2tn6OwtP8LuV+FfiHAEW3G5zpLwbX nT5Ez2i4O//oS8108a7V28WG+fTGp8iXEEOWXXM1KwCw6Rz1i3FB77zmiLya+TEritTt xCnw== X-Gm-Message-State: APt69E2rj6yH8IhFfxkp2IilI9OWuf+VvohI22Irx7lQ6tk1wshGPSwM 1niJGvhknz4BcbY7qj0uXEar X-Received: by 2002:a62:ed13:: with SMTP id u19-v6mr18440964pfh.125.1530365677182; Sat, 30 Jun 2018 06:34:37 -0700 (PDT) Received: from localhost.localdomain ([2405:204:73ca:b257:2c06:3367:1893:796]) by smtp.gmail.com with ESMTPSA id m10-v6sm18738778pgq.89.2018.06.30.06.34.27 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 30 Jun 2018 06:34:36 -0700 (PDT) From: Manivannan Sadhasivam To: wsa@the-dreams.de, robh+dt@kernel.org, afaerber@suse.de Cc: linus.walleij@linaro.org, linux-i2c@vger.kernel.org, liuwei@actions-semi.com, mp-cs@actions-semi.com, 96boards@ucrobotics.com, devicetree@vger.kernel.org, andy.shevchenko@gmail.com, daniel.thompson@linaro.org, amit.kucheria@linaro.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, hzhang@ucrobotics.com, bdong@ucrobotics.com, manivannanece23@gmail.com, thomas.liau@actions-semi.com, jeff.chen@actions-semi.com, Manivannan Sadhasivam Subject: [PATCH v3 5/6] i2c: Add Actions Semiconductor Owl family S900 I2C driver Date: Sat, 30 Jun 2018 19:03:29 +0530 Message-Id: <20180630133330.23858-6-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180630133330.23858-1-manivannan.sadhasivam@linaro.org> References: <20180630133330.23858-1-manivannan.sadhasivam@linaro.org> Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Add Actions Semiconductor Owl family S900 I2C driver. Signed-off-by: Manivannan Sadhasivam --- drivers/i2c/busses/Kconfig | 7 + drivers/i2c/busses/Makefile | 1 + drivers/i2c/busses/i2c-owl.c | 477 +++++++++++++++++++++++++++++++++++ 3 files changed, 485 insertions(+) create mode 100644 drivers/i2c/busses/i2c-owl.c -- 2.17.1 diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index 4f8df2ec87b1..8c8025f87ce4 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -762,6 +762,13 @@ config I2C_OMAP Like OMAP1510/1610/1710/5912 and OMAP242x. For details see http://www.ti.com/omap. +config I2C_OWL + tristate "Actions Semiconductor Owl I2C Controller" + depends on ARCH_ACTIONS || COMPILE_TEST + help + Say Y here if you want to use the I2C bus controller on + the Actions Semiconductor Owl SoC's. + config I2C_PASEMI tristate "PA Semi SMBus interface" depends on PPC_PASEMI && PCI diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile index 5a869144a0c5..b71618f77880 100644 --- a/drivers/i2c/busses/Makefile +++ b/drivers/i2c/busses/Makefile @@ -76,6 +76,7 @@ obj-$(CONFIG_I2C_MXS) += i2c-mxs.o obj-$(CONFIG_I2C_NOMADIK) += i2c-nomadik.o obj-$(CONFIG_I2C_OCORES) += i2c-ocores.o obj-$(CONFIG_I2C_OMAP) += i2c-omap.o +obj-$(CONFIG_I2C_OWL) += i2c-owl.o obj-$(CONFIG_I2C_PASEMI) += i2c-pasemi.o obj-$(CONFIG_I2C_PCA_PLATFORM) += i2c-pca-platform.o obj-$(CONFIG_I2C_PMCMSP) += i2c-pmcmsp.o diff --git a/drivers/i2c/busses/i2c-owl.c b/drivers/i2c/busses/i2c-owl.c new file mode 100644 index 000000000000..144a249bf994 --- /dev/null +++ b/drivers/i2c/busses/i2c-owl.c @@ -0,0 +1,477 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Actions Semiconductor Owl SoC's I2C driver + * + * Copyright (c) 2014 Actions Semi Inc. + * Author: David Liu + * + * Copyright (c) 2018 Linaro Ltd. + * Author: Manivannan Sadhasivam + */ + +#include +#include +#include +#include +#include +#include +#include + +/* I2C registers */ +#define OWL_I2C_REG_CTL 0x0000 +#define OWL_I2C_REG_CLKDIV 0x0004 +#define OWL_I2C_REG_STAT 0x0008 +#define OWL_I2C_REG_ADDR 0x000C +#define OWL_I2C_REG_TXDAT 0x0010 +#define OWL_I2C_REG_RXDAT 0x0014 +#define OWL_I2C_REG_CMD 0x0018 +#define OWL_I2C_REG_FIFOCTL 0x001C +#define OWL_I2C_REG_FIFOSTAT 0x0020 +#define OWL_I2C_REG_DATCNT 0x0024 +#define OWL_I2C_REG_RCNT 0x0028 + +/* I2Cx_CTL Bit Mask */ +#define OWL_I2C_CTL_RB BIT(1) +#define OWL_I2C_CTL_GBCC(x) (((x) & 0x3) << 2) +#define OWL_I2C_CTL_GBCC_NONE OWL_I2C_CTL_GBCC(0) +#define OWL_I2C_CTL_GBCC_START OWL_I2C_CTL_GBCC(1) +#define OWL_I2C_CTL_GBCC_STOP OWL_I2C_CTL_GBCC(2) +#define OWL_I2C_CTL_GBCC_RSTART OWL_I2C_CTL_GBCC(3) +#define OWL_I2C_CTL_IRQE BIT(5) +#define OWL_I2C_CTL_EN BIT(7) +#define OWL_I2C_CTL_AE BIT(8) +#define OWL_I2C_CTL_SHSM BIT(10) + +#define OWL_I2C_DIV_FACTOR(x) ((x) & 0xff) + +/* I2Cx_STAT Bit Mask */ +#define OWL_I2C_STAT_RACK BIT(0) +#define OWL_I2C_STAT_BEB BIT(1) +#define OWL_I2C_STAT_IRQP BIT(2) +#define OWL_I2C_STAT_LAB BIT(3) +#define OWL_I2C_STAT_STPD BIT(4) +#define OWL_I2C_STAT_STAD BIT(5) +#define OWL_I2C_STAT_BBB BIT(6) +#define OWL_I2C_STAT_TCB BIT(7) +#define OWL_I2C_STAT_LBST BIT(8) +#define OWL_I2C_STAT_SAMB BIT(9) +#define OWL_I2C_STAT_SRGC BIT(10) + +/* I2Cx_CMD Bit Mask */ +#define OWL_I2C_CMD_SBE BIT(0) +#define OWL_I2C_CMD_RBE BIT(4) +#define OWL_I2C_CMD_DE BIT(8) +#define OWL_I2C_CMD_NS BIT(9) +#define OWL_I2C_CMD_SE BIT(10) +#define OWL_I2C_CMD_MSS BIT(11) +#define OWL_I2C_CMD_WRS BIT(12) +#define OWL_I2C_CMD_SECL BIT(15) + +#define OWL_I2C_CMD_AS(x) (((x) & 0x7) << 1) +#define OWL_I2C_CMD_SAS(x) (((x) & 0x7) << 5) + +/* I2Cx_FIFOCTL Bit Mask */ +#define OWL_I2C_FIFOCTL_NIB BIT(0) +#define OWL_I2C_FIFOCTL_RFR BIT(1) +#define OWL_I2C_FIFOCTL_TFR BIT(2) + +/* I2Cc_FIFOSTAT Bit Mask */ +#define OWL_I2C_FIFOSTAT_RNB BIT(1) +#define OWL_I2C_FIFOSTAT_RFE BIT(2) +#define OWL_I2C_FIFOSTAT_TFF BIT(5) +#define OWL_I2C_FIFOSTAT_TFD GENMASK(23, 16) +#define OWL_I2C_FIFOSTAT_RFD GENMASK(15, 8) + +/* I2C bus timeout */ +#define OWL_I2C_TIMEOUT msecs_to_jiffies(4 * 1000) + +#define OWL_I2C_MAX_RETRIES 50 + +#define OWL_I2C_DEF_SPEED_HZ 100000 +#define OWL_I2C_MAX_SPEED_HZ 400000 + +struct owl_i2c_dev { + struct i2c_adapter adap; + struct i2c_msg *msg; + struct completion msg_complete; + struct clk *clk; + void __iomem *base; + unsigned long clk_rate; + u32 bus_freq; + u32 msg_ptr; +}; + +static void owl_i2c_update_reg(void __iomem *reg, unsigned int val, bool state) +{ + unsigned int regval; + + regval = readl(reg); + + if (state) + regval |= val; + else + regval &= ~val; + + writel(regval, reg); +} + +static int owl_i2c_reset(struct owl_i2c_dev *i2c_dev) +{ + unsigned int val, timeout = 0; + + owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_CTL, + OWL_I2C_CTL_EN, false); + mdelay(1); + owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_CTL, + OWL_I2C_CTL_EN, true); + + /* Reset FIFO */ + owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_FIFOCTL, + OWL_I2C_FIFOCTL_RFR | OWL_I2C_FIFOCTL_TFR, + true); + + /* Wait 50ms for FIFO reset complete */ + do { + val = readl(i2c_dev->base + OWL_I2C_REG_FIFOCTL); + if (!(val & (OWL_I2C_FIFOCTL_RFR | OWL_I2C_FIFOCTL_TFR))) + break; + mdelay(1); + } while (timeout++ < OWL_I2C_MAX_RETRIES); + + if (timeout > OWL_I2C_MAX_RETRIES) { + dev_err(&i2c_dev->adap.dev, "FIFO reset timeout"); + return -ETIMEDOUT; + } + + /* Clear status registers */ + writel(0, i2c_dev->base + OWL_I2C_REG_STAT); + + return 0; +} + +static int owl_i2c_set_freq(struct owl_i2c_dev *i2c_dev) +{ + unsigned int val; + + val = (i2c_dev->clk_rate + i2c_dev->bus_freq * 16 - 1) / + (i2c_dev->bus_freq * 16); + + /* Set clock divider factor */ + writel(OWL_I2C_DIV_FACTOR(val), i2c_dev->base + OWL_I2C_REG_CLKDIV); + + return 0; +} + +static int owl_i2c_hw_init(struct owl_i2c_dev *i2c_dev) +{ + int ret; + + /* Reset I2C controller */ + ret = owl_i2c_reset(i2c_dev); + if (ret) + return ret; + + /* Set bus frequency */ + return owl_i2c_set_freq(i2c_dev); +} + +static irqreturn_t owl_i2c_interrupt(int irq, void *_dev) +{ + struct owl_i2c_dev *i2c_dev = _dev; + struct i2c_msg *msg = i2c_dev->msg; + unsigned int stat, fifostat; + + fifostat = readl(i2c_dev->base + OWL_I2C_REG_FIFOSTAT); + if (fifostat & OWL_I2C_FIFOSTAT_RNB) { + dev_dbg(&i2c_dev->adap.dev, "received NACK from device"); + goto stop; + } + + stat = readl(i2c_dev->base + OWL_I2C_REG_STAT); + if (stat & OWL_I2C_STAT_BEB) { + dev_dbg(&i2c_dev->adap.dev, "bus error"); + goto stop; + } + + /* Handle FIFO read */ + if (msg->flags & I2C_M_RD) { + while ((readl(i2c_dev->base + OWL_I2C_REG_FIFOSTAT) & + OWL_I2C_FIFOSTAT_RFE) && + (i2c_dev->msg_ptr < msg->len)) { + msg->buf[i2c_dev->msg_ptr++] = readl(i2c_dev->base + + OWL_I2C_REG_RXDAT); + } + } else { + /* Handle the remaining bytes which were not sent */ + while (!(readl(i2c_dev->base + OWL_I2C_REG_FIFOSTAT) & + OWL_I2C_FIFOSTAT_TFF) && + i2c_dev->msg_ptr < msg->len) { + writel(msg->buf[i2c_dev->msg_ptr++], i2c_dev->base + + OWL_I2C_REG_TXDAT); + } + } + +stop: + /* Clear pending interrupts */ + owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_STAT, + OWL_I2C_STAT_IRQP, true); + + complete_all(&i2c_dev->msg_complete); + + return IRQ_HANDLED; +} + +static u32 owl_i2c_func(struct i2c_adapter *adap) +{ + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; +} + +static int owl_i2c_check_bus_busy(struct i2c_adapter *adap) +{ + struct owl_i2c_dev *i2c_dev = i2c_get_adapdata(adap); + unsigned long timeout; + unsigned int val; + + /* Check for Arbitration lost */ + val = readl(i2c_dev->base + OWL_I2C_REG_STAT); + if (val & OWL_I2C_STAT_LAB) { + val &= ~OWL_I2C_STAT_LAB; + writel(val, i2c_dev->base + OWL_I2C_REG_STAT); + return -EAGAIN; + } + + /* Check for Bus busy */ + timeout = jiffies + OWL_I2C_TIMEOUT; + while (readl(i2c_dev->base + OWL_I2C_REG_STAT) & OWL_I2C_STAT_BBB) { + if (time_after(jiffies, timeout)) { + dev_err(&adap->dev, "Bus busy timeout"); + return -ETIMEDOUT; + } + } + + return 0; +} + +static int owl_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, + int num) +{ + struct owl_i2c_dev *i2c_dev = i2c_get_adapdata(adap); + struct i2c_msg *msg; + unsigned long time_left; + unsigned int i2c_cmd; + unsigned int addr; + int ret, idx; + + ret = owl_i2c_hw_init(i2c_dev); + if (ret) + return ret; + + ret = owl_i2c_check_bus_busy(adap); + if (ret) + return ret; + + reinit_completion(&i2c_dev->msg_complete); + + /* Enable I2C controller interrupt */ + owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_CTL, + OWL_I2C_CTL_IRQE, true); + + /* + * Select: FIFO enable, Master mode, Stop enable, Data count enable, + * Send start bit + */ + i2c_cmd = (OWL_I2C_CMD_SECL | OWL_I2C_CMD_MSS | OWL_I2C_CMD_SE + | OWL_I2C_CMD_NS | OWL_I2C_CMD_DE | OWL_I2C_CMD_SBE); + + /* Handle repeated start condition */ + if (num > 1) { + /* Set internal address length and enable repeated start */ + i2c_cmd |= (OWL_I2C_CMD_AS(msgs[0].len + 1) + | OWL_I2C_CMD_SAS(1) | OWL_I2C_CMD_RBE); + + /* Write slave address */ + addr = i2c_8bit_addr_from_msg(&msgs[0]); + writel(addr, i2c_dev->base + OWL_I2C_REG_TXDAT); + + /* Write internal register address */ + for (idx = 0; idx < msgs[0].len; idx++) + writel(msgs[0].buf[idx], i2c_dev->base + + OWL_I2C_REG_TXDAT); + + msg = &msgs[1]; + } else { + /* Set address length */ + i2c_cmd |= OWL_I2C_CMD_AS(1); + msg = &msgs[0]; + } + + i2c_dev->msg = msg; + i2c_dev->msg_ptr = 0; + + /* Set data count for the message */ + writel(msg->len, i2c_dev->base + OWL_I2C_REG_DATCNT); + + addr = i2c_8bit_addr_from_msg(msg); + writel(addr, i2c_dev->base + OWL_I2C_REG_TXDAT); + + if (!(msg->flags & I2C_M_RD)) { + /* Write data to FIFO */ + for (idx = 0; idx < msg->len; idx++) { + /* Check for FIFO full */ + if (readl(i2c_dev->base + OWL_I2C_REG_FIFOSTAT) + & OWL_I2C_FIFOSTAT_TFF) + break; + + writel(msg->buf[idx], + i2c_dev->base + OWL_I2C_REG_TXDAT); + } + + i2c_dev->msg_ptr = idx; + } + + /* Ignore the NACK if needed */ + if (msg->flags & I2C_M_IGNORE_NAK) + owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_FIFOCTL, + OWL_I2C_FIFOCTL_NIB, true); + else + owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_FIFOCTL, + OWL_I2C_FIFOCTL_NIB, false); + + /* Start the transfer */ + writel(i2c_cmd, i2c_dev->base + OWL_I2C_REG_CMD); + + time_left = wait_for_completion_timeout(&i2c_dev->msg_complete, + adap->timeout); + if (time_left == 0) { + dev_err(&adap->dev, "Transaction timed out"); + /* Send stop condition and release the bus */ + owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_CTL, + OWL_I2C_CTL_GBCC_STOP | OWL_I2C_CTL_RB, true); + ret = -ETIMEDOUT; + } + + /* + * By default, 0 will be returned if interrupt occurred but no + * read or write happened. Else if msg_ptr equals to message length, + * message count will be returned. + */ + if (i2c_dev->msg_ptr == msg->len) + ret = num; + + /* Disable I2C controller */ + owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_CTL, + OWL_I2C_CTL_EN, false); + + return ret; +} + +static const struct i2c_algorithm owl_i2c_algorithm = { + .master_xfer = owl_i2c_master_xfer, + .functionality = owl_i2c_func, +}; + +static const struct i2c_adapter_quirks owl_i2c_quirks = { + .flags = I2C_AQ_COMB | I2C_AQ_COMB_WRITE_FIRST, + .max_read_len = 240, + .max_write_len = 240, + .max_comb_1st_msg_len = 6, + .max_comb_2nd_msg_len = 240, +}; + +static int owl_i2c_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct owl_i2c_dev *i2c_dev; + struct resource *res; + int ret, irq; + + i2c_dev = devm_kzalloc(dev, sizeof(*i2c_dev), GFP_KERNEL); + if (!i2c_dev) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + i2c_dev->base = devm_ioremap_resource(dev, res); + if (IS_ERR(i2c_dev->base)) + return PTR_ERR(i2c_dev->base); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(dev, "failed to get IRQ number\n"); + return irq; + } + + if (of_property_read_u32(dev->of_node, "clock-frequency", + &i2c_dev->bus_freq)) + i2c_dev->bus_freq = OWL_I2C_DEF_SPEED_HZ; + + /* We support only frequencies of 100k and 400k for now */ + if (i2c_dev->bus_freq != OWL_I2C_DEF_SPEED_HZ && + i2c_dev->bus_freq > OWL_I2C_MAX_SPEED_HZ) { + dev_err(dev, "invalid clock-frequency %d\n", i2c_dev->bus_freq); + return -EINVAL; + } + + i2c_dev->clk = devm_clk_get(dev, NULL); + if (IS_ERR(i2c_dev->clk)) { + dev_err(dev, "failed to get clock\n"); + return PTR_ERR(i2c_dev->clk); + } + + ret = clk_prepare_enable(i2c_dev->clk); + if (ret) + return ret; + + i2c_dev->clk_rate = clk_get_rate(i2c_dev->clk); + if (!i2c_dev->clk_rate) { + dev_err(dev, "input clock rate should not be zero\n"); + ret = -EINVAL; + goto disable_clk; + } + + init_completion(&i2c_dev->msg_complete); + i2c_dev->adap.owner = THIS_MODULE; + i2c_dev->adap.algo = &owl_i2c_algorithm; + i2c_dev->adap.timeout = OWL_I2C_TIMEOUT; + i2c_dev->adap.quirks = &owl_i2c_quirks; + i2c_dev->adap.dev.parent = dev; + i2c_dev->adap.dev.of_node = dev->of_node; + snprintf(i2c_dev->adap.name, sizeof(i2c_dev->adap.name), + "%s", "OWL I2C adapter"); + i2c_set_adapdata(&i2c_dev->adap, i2c_dev); + + platform_set_drvdata(pdev, i2c_dev); + + ret = devm_request_irq(dev, irq, owl_i2c_interrupt, 0, pdev->name, + i2c_dev); + if (ret) { + dev_err(dev, "failed to request irq %d\n", irq); + goto disable_clk; + } + + return i2c_add_adapter(&i2c_dev->adap); + +disable_clk: + clk_disable_unprepare(i2c_dev->clk); + + return ret; +} + +static const struct of_device_id owl_i2c_of_match[] = { + {.compatible = "actions,s900-i2c"}, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, owl_i2c_of_match); + +static struct platform_driver owl_i2c_driver = { + .probe = owl_i2c_probe, + .driver = { + .name = "owl-i2c", + .of_match_table = of_match_ptr(owl_i2c_of_match), + }, +}; +module_platform_driver(owl_i2c_driver); + +MODULE_AUTHOR("David Liu "); +MODULE_AUTHOR("Manivannan Sadhasivam "); +MODULE_DESCRIPTION("Actions Semiconductor Owl SoC's I2C driver"); +MODULE_LICENSE("GPL");