From patchwork Fri Jun 14 17:45:47 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Sylwester Nawrocki/Kernel \\(PLT\\) /SRPOL/Staff Engineer/Samsung Electronics" X-Patchwork-Id: 2722681 Return-Path: X-Original-To: patchwork-linux-fbdev@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 590B3C0AB1 for ; Fri, 14 Jun 2013 17:47:25 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 1F6B9202F3 for ; Fri, 14 Jun 2013 17:47:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0973420366 for ; Fri, 14 Jun 2013 17:47:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753387Ab3FNRrU (ORCPT ); Fri, 14 Jun 2013 13:47:20 -0400 Received: from mailout4.samsung.com ([203.254.224.34]:29734 "EHLO mailout4.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753236Ab3FNRrT (ORCPT ); Fri, 14 Jun 2013 13:47:19 -0400 Received: from epcpsbgm1.samsung.com (epcpsbgm1 [203.254.230.26]) by mailout4.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0MOE003RX9ETF360@mailout4.samsung.com>; Sat, 15 Jun 2013 02:47:17 +0900 (KST) X-AuditID: cbfee61a-b7f3b6d000006edd-c8-51bb5725deb6 Received: from epmmp2 ( [203.254.227.17]) by epcpsbgm1.samsung.com (EPCPMTA) with SMTP id 60.CC.28381.5275BB15; Sat, 15 Jun 2013 02:47:17 +0900 (KST) Received: from amdc1344.digital.local ([106.116.147.32]) by mmp2.samsung.com (Oracle Communications Messaging Server 7u4-24.01 (7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0MOE00L589D10O50@mmp2.samsung.com>; Sat, 15 Jun 2013 02:47:17 +0900 (KST) From: Sylwester Nawrocki To: kishon@ti.com Cc: linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org, linux-samsung-soc@vger.kernel.org, kyungmin.park@samsung.com, sw0312.kim@samsung.com, devicetree-discuss@lists.ozlabs.org, kgene.kim@samsung.com, dh09.lee@samsung.com, jg1.han@samsung.com, linux-fbdev@vger.kernel.org, Sylwester Nawrocki Subject: [RFC PATCH 1/5] phy: Add driver for Exynos MIPI CSIS/DSIM DPHYs Date: Fri, 14 Jun 2013 19:45:47 +0200 Message-id: <1371231951-1969-2-git-send-email-s.nawrocki@samsung.com> X-Mailer: git-send-email 1.7.9.5 In-reply-to: <1371231951-1969-1-git-send-email-s.nawrocki@samsung.com> References: <1371231951-1969-1-git-send-email-s.nawrocki@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrFLMWRmVeSWpSXmKPExsVy+t9jQV3V8N2BBmun6FocmP2Q1eL6eTuL ywsvsVr0LrjKZnHhaQ+bxdmmN+wWmx5fY7U40feB1aJnw1ZWixnn9zFZHH7TDmRNfsnmwOOx eUm9x/kZCxk9+rasYvQ4fmM7k8fnTXIBrFFcNimpOZllqUX6dglcGY9vzmItmGJZsWFxH1sD 4z29LkZODgkBE4lnH04yQthiEhfurWfrYuTiEBKYzijx78EfFging0liw8G5LCBVbAKGEr1H +4A6ODhEBAQlPn1iBKlhFrjCJNF1awMzSI2wgIfE6fu72EBsFgFVie0/94PFeQVcJaZsfMIC 0ishoCAxZ5INSJhTwE1ifdMJdhBbCKikceNS5gmMvAsYGVYxiqYWJBcUJ6XnGuoVJ+YWl+al 6yXn525iBIfgM6kdjCsbLA4xCnAwKvHwTlDbHSjEmlhWXJl7iFGCg1lJhPeuKlCINyWxsiq1 KD++qDQntfgQozQHi5I474FW60AhgfTEktTs1NSC1CKYLBMHp1QDY3bXh8frbntcei5zXIPv zeu/LzVLV39vuTrbpfhcxbukGGPHJxY8DGxCp2+cNy/IPpby7uUd/idWx6WaN6ZpB5nun/b8 V8gkpr064Td1brHJWu+4K2ol3MKTqPfvSu/NvgsXZA+Z2FluL57ErxU6saF+e+XDl+ctlzDf 915lEn729TsFn8U1KUosxRmJhlrMRcWJAFvjK409AgAA Sender: linux-fbdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org X-Spam-Status: No, score=-7.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add a PHY provider driver for the Samsung S5P/Exynos SoC MIPI CSI-2 receiver and MIPI DSI transmitter DPHYs. Signed-off-by: Sylwester Nawrocki Signed-off-by: Kyungmin Park --- .../bindings/phy/exynos-video-mipi-phy.txt | 16 ++ drivers/phy/Kconfig | 10 ++ drivers/phy/Makefile | 3 +- drivers/phy/exynos_video_mipi_phy.c | 166 ++++++++++++++++++++ 4 files changed, 194 insertions(+), 1 deletion(-) create mode 100644 Documentation/devicetree/bindings/phy/exynos-video-mipi-phy.txt create mode 100644 drivers/phy/exynos_video_mipi_phy.c diff --git a/Documentation/devicetree/bindings/phy/exynos-video-mipi-phy.txt b/Documentation/devicetree/bindings/phy/exynos-video-mipi-phy.txt new file mode 100644 index 0000000..32311c89 --- /dev/null +++ b/Documentation/devicetree/bindings/phy/exynos-video-mipi-phy.txt @@ -0,0 +1,16 @@ +Samsung S5P/EXYNOS SoC series MIPI CSIS/DSIM DPHY +------------------------------------------------- + +Required properties: +- compatible : "samsung,-video-phy", currently most SoCs can claim + compatibility with the S5PV210 MIPI CSIS/DSIM PHY and thus should use + "samsung,s5pv210-video-phy"; +- reg : offset and length of the MIPI DPHY register set; +- #phy-cells : from the generic phy bindings, must be 1; + +For "samsung,s5pv210-video-phy" compatible DPHYs the second cell in the PHY +specifier identifies the DPHY and its meaning is as follows: + 0 - MIPI CSIS 0, + 1 - MIPI DSIM 0, + 2 - MIPI CSIS 1, + 3 - MIPI DSIM 1. diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig index 0764a54..d234e99 100644 --- a/drivers/phy/Kconfig +++ b/drivers/phy/Kconfig @@ -11,3 +11,13 @@ menuconfig GENERIC_PHY devices present in the kernel. This layer will have the generic API by which phy drivers can create PHY using the phy framework and phy users can obtain reference to the PHY. + +if GENERIC_PHY + +config EXYNOS_VIDEO_MIPI_PHY + bool "S5P/EXYNOS MIPI CSI-2/DSI PHY driver" + depends on OF + help + Support for MIPI CSI-2 and MIPI DSI DPHY found on Samsung + S5P and EXYNOS SoCs. +endif diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile index 9e9560f..b16f2c1 100644 --- a/drivers/phy/Makefile +++ b/drivers/phy/Makefile @@ -2,4 +2,5 @@ # Makefile for the phy drivers. # -obj-$(CONFIG_GENERIC_PHY) += phy-core.o +obj-$(CONFIG_GENERIC_PHY) += phy-core.o +obj-$(CONFIG_EXYNOS_VIDEO_MIPI_PHY) += exynos_video_mipi_phy.o diff --git a/drivers/phy/exynos_video_mipi_phy.c b/drivers/phy/exynos_video_mipi_phy.c new file mode 100644 index 0000000..8d4976f --- /dev/null +++ b/drivers/phy/exynos_video_mipi_phy.c @@ -0,0 +1,166 @@ +/* + * Samsung S5P/EXYNOS SoC series MIPI CSIS/DSIM DPHY driver + * + * Copyright (C) 2013 Samsung Electronics Co., Ltd. + * Author: Sylwester Nawrocki + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* MIPI_PHYn_CONTROL register bit definitions */ +#define EXYNOS_MIPI_PHY_ENABLE (1 << 0) +#define EXYNOS_MIPI_PHY_SRESETN (1 << 1) +#define EXYNOS_MIPI_PHY_MRESETN (1 << 2) +#define EXYNOS_MIPI_PHY_RESET_MASK (3 << 1) + +#define EXYNOS_MAX_VIDEO_PHYS 4 + +struct exynos_video_phy { + spinlock_t slock; + struct phy *phys[EXYNOS_MAX_VIDEO_PHYS]; + void __iomem *regs; +}; + +/* + * The @id argument specifies MIPI CSIS or DSIM PHY as follows: + * 0 - MIPI CSIS 0 + * 1 - MIPI DSIM 0 + * 2 - MIPI CSIS 1 + * 3 - MIPI DSIM 1 + */ +static int set_phy_state(struct exynos_video_phy *state, + unsigned int id, int on) +{ + void __iomem *addr = id < 2 ? state->regs : state->regs + 4; + unsigned long flags; + u32 reg, reset; + + pr_debug("%s(): id: %d, on: %d, addr: %#x, base: %#x\n", + __func__, id, on, (u32)addr, (u32)state->regs); + + if (WARN_ON(id > EXYNOS_MAX_VIDEO_PHYS)) + return -EINVAL; + + if (id & 1) + reset = EXYNOS_MIPI_PHY_MRESETN; + else + reset = EXYNOS_MIPI_PHY_SRESETN; + + spin_lock_irqsave(&state->slock, flags); + + reg = readl(addr); + if (on) + reg |= reset; + else + reg &= ~reset; + writel(reg, addr); + + if (on) + reg |= EXYNOS_MIPI_PHY_ENABLE; + else if (!(reg & EXYNOS_MIPI_PHY_RESET_MASK)) + reg &= ~EXYNOS_MIPI_PHY_ENABLE; + + writel(reg, addr); + + spin_unlock_irqrestore(&state->slock, flags); + return 0; +} + +static int exynos_video_phy_power_on(struct phy *phy) +{ + struct exynos_video_phy *state = dev_get_drvdata(&phy->dev); + return set_phy_state(state, phy->id, 1); +} + +static int exynos_video_phy_power_off(struct phy *phy) +{ + struct exynos_video_phy *state = dev_get_drvdata(&phy->dev); + return set_phy_state(state, phy->id, 0); +} + +static struct phy *exynos_video_phy_xlate(struct device *dev, + struct of_phandle_args *args) +{ + struct exynos_video_phy *state = dev_get_drvdata(dev); + + if (WARN_ON(args->args[0] > EXYNOS_MAX_VIDEO_PHYS)) + return NULL; + + return state->phys[args->args[0]]; +} + +static struct phy_ops exynos_video_phy_ops = { + .power_on = exynos_video_phy_power_on, + .power_off = exynos_video_phy_power_off, + .owner = THIS_MODULE, +}; + +static int exynos_video_phy_probe(struct platform_device *pdev) +{ + struct exynos_video_phy *state; + struct device *dev = &pdev->dev; + struct resource res; + struct phy_provider *phy_provider; + int ret, i; + + state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL); + if (!state) + return -ENOMEM; + + ret = of_address_to_resource(dev->of_node, 0, &res); + if (ret < 0) + return ret; + + state->regs = devm_ioremap_resource(dev, &res); + if (IS_ERR(state->regs)) + return PTR_ERR(state->regs); + + dev_set_drvdata(dev, state); + + phy_provider = devm_of_phy_provider_register(dev, THIS_MODULE, + exynos_video_phy_xlate); + if (IS_ERR(phy_provider)) + return PTR_ERR(phy_provider); + + for (i = 0; i < EXYNOS_MAX_VIDEO_PHYS; i++) { + state->phys[i] = devm_phy_create(dev, i, &exynos_video_phy_ops, + state); + if (IS_ERR(state->phys[i])) { + dev_err(dev, "failed to create PHY %d\n", i); + return PTR_ERR(state->phys[i]); + } + } + + return 0; +} + +static const struct of_device_id exynos_video_phy_of_match[] = { + { .compatible = "samsung,s5pv210-video-phy" }, + { }, +}; + +static struct platform_driver exynos_video_phy_driver = { + .probe = exynos_video_phy_probe, + .driver = { + .of_match_table = exynos_video_phy_of_match, + .name = "exynos-video-phy", + .owner = THIS_MODULE, + } +}; +module_platform_driver(exynos_video_phy_driver); + +MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC MIPI CSI-2/DSI DPHY driver"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Sylwester Nawrocki ");