From patchwork Tue May 20 16:43:30 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomasz Figa X-Patchwork-Id: 4211801 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 601BA9F1CD for ; Tue, 20 May 2014 16:47:27 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 59C55200E7 for ; Tue, 20 May 2014 16:47:26 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 53C912020F for ; Tue, 20 May 2014 16:47:25 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Wmn9Y-0001Aq-LH; Tue, 20 May 2014 16:44:36 +0000 Received: from mailout3.w1.samsung.com ([210.118.77.13]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Wmn94-0000xo-M1 for linux-arm-kernel@lists.infradead.org; Tue, 20 May 2014 16:44:08 +0000 Received: from eucpsbgm2.samsung.com (unknown [203.254.199.245]) by mailout3.w1.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0N5V000BFT4QAS50@mailout3.w1.samsung.com> for linux-arm-kernel@lists.infradead.org; Tue, 20 May 2014 17:43:39 +0100 (BST) X-AuditID: cbfec7f5-b7f626d000004b39-7a-537b863b8f72 Received: from eusync4.samsung.com ( [203.254.199.214]) by eucpsbgm2.samsung.com (EUCPMTA) with SMTP id 42.E8.19257.B368B735; Tue, 20 May 2014 17:43:39 +0100 (BST) Received: from AMDC1227.digital.local ([106.116.147.199]) by eusync4.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0N5V0027KT4ME150@eusync4.samsung.com>; Tue, 20 May 2014 17:43:39 +0100 (BST) From: Tomasz Figa To: linux-samsung-soc@vger.kernel.org Subject: [PATCH 3/4] clk: samsung: Add driver to control CLKOUT line on Exynos SoCs Date: Tue, 20 May 2014 18:43:30 +0200 Message-id: <1400604211-9447-4-git-send-email-t.figa@samsung.com> X-Mailer: git-send-email 1.9.3 In-reply-to: <1400604211-9447-1-git-send-email-t.figa@samsung.com> References: <1400604211-9447-1-git-send-email-t.figa@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrGLMWRmVeSWpSXmKPExsVy+t/xa7rWbdXBBpfOc1hMffiEzWL+kXOs Fr0LrrJZbHp8jdXi8q45bBYzzu9jslh75C67xdLrF5ksnk64yGaxaOsXdospiw6zWrTuPcJu sX7GaxaLVbv+MFq0/93L5sDvsWbeGkaPnbPusntsWtXJ5nHn2h42j81L6j36tqxi9Pi8SS6A PYrLJiU1J7MstUjfLoErY0bzRaaCexYVJ469ZGpgfKDfxcjBISFgIjGrJ7WLkRPIFJO4cG89 WxcjF4eQwFJGiS8bFzNBOH1MEpO7jrGAVLEJqEl8bnjEBmKLCKhKfG5bwA5SxCwwjUVi1bJ2 dpCEsECoxN6HP9hBNrAAFU3dpwES5hVwlPg7/TQzxDY5id5tb8BsTgEniR/tz8BahYBqni3t ZJ7AyLuAkWEVo2hqaXJBcVJ6rpFecWJucWleul5yfu4mRkjYft3BuPSY1SFGAQ5GJR5eidSq YCHWxLLiytxDjBIczEoivPbB1cFCvCmJlVWpRfnxRaU5qcWHGJk4OKUaGE885fFXcY9hctdg j9m5ur1x5wadfJ2ni3sXRB8/V3BqfubiCVOO3j2eNs/Dzvezefs8eZtNqdz7Ur14tz/Ls1u6 Ort1gcK8z2LCigUMkcK7LjJePPmqdNlftbY49ZtiUyKtNjlq2DtM6r2snLfjU3QWi2Kc1MLu GUZc68+4xZ4OrTY0Lss+qMRSnJFoqMVcVJwIAFfookc5AgAA X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140520_094407_239170_63509507 X-CRM114-Status: GOOD ( 18.35 ) X-Spam-Score: -5.7 (-----) Cc: Mark Rutland , devicetree@vger.kernel.org, Kukjin Kim , Mike Turquette , Pankaj Dubey , Rahul Sharma , linux-kernel@vger.kernel.org, Tomasz Figa , Rob Herring , Mark Brown , Tushar Behera , Tomasz Figa , linux-arm-kernel@lists.infradead.org, Marek Szyprowski X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.5 required=5.0 tests=BAYES_00,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 This patch introduces a driver that handles configuration of CLKOUT pin of Exynos SoCs that can be used to output certain clocks from inside of the SoC to a dedicated output pin. Signed-off-by: Tomasz Figa --- .../devicetree/bindings/arm/samsung/pmu.txt | 30 ++++ drivers/clk/samsung/Makefile | 1 + drivers/clk/samsung/clk-exynos-clkout.c | 153 +++++++++++++++++++++ 3 files changed, 184 insertions(+) create mode 100644 drivers/clk/samsung/clk-exynos-clkout.c diff --git a/Documentation/devicetree/bindings/arm/samsung/pmu.txt b/Documentation/devicetree/bindings/arm/samsung/pmu.txt index b562634..5ed94a9 100644 --- a/Documentation/devicetree/bindings/arm/samsung/pmu.txt +++ b/Documentation/devicetree/bindings/arm/samsung/pmu.txt @@ -11,8 +11,38 @@ Properties: - reg : offset and length of the register set. + - #clock-cells : must be <1>, since PMU requires once cell as clock specifier. + The single specifier cell is used as index to list of clocks + provided by PMU, which is currently: + 0 : SoC clock output (CLKOUT pin) + + - clock-names : list of clock names for particular CLKOUT mux inputs in + following format: + "clkoutN", where N is a decimal number corresponding to + CLKOUT mux control bits value for given input, e.g. + "clkout0", "clkout7", "clkout15". + + - clocks : list of phandles and specifiers to all input clocks listed in + clock-names property. + Example : pmu_system_controller: system-controller@10040000 { compatible = "samsung,exynos5250-pmu", "syscon"; reg = <0x10040000 0x5000>; + #clock-cells = <1>; + clock-names = "clkout0", "clkout1", "clkout2", "clkout3", + "clkout4", "clkout8", "clkout9"; + clocks = <&clock CLK_OUT_DMC>, <&clock CLK_OUT_TOP>, + <&clock CLK_OUT_LEFTBUS>, <&clock CLK_OUT_RIGHTBUS>, + <&clock CLK_OUT_CPU>, <&clock CLK_XXTI>, + <&clock CLK_XUSBXTI>; +}; + +Example of clock consumer : + +usb3503: usb3503@08 { + /* ... */ + clock-names = "refclk"; + clocks = <&pmu_system_controller 0>; + /* ... */ }; diff --git a/drivers/clk/samsung/Makefile b/drivers/clk/samsung/Makefile index 25646c6..efeb8e5 100644 --- a/drivers/clk/samsung/Makefile +++ b/drivers/clk/samsung/Makefile @@ -10,6 +10,7 @@ obj-$(CONFIG_SOC_EXYNOS5260) += clk-exynos5260.o obj-$(CONFIG_SOC_EXYNOS5420) += clk-exynos5420.o obj-$(CONFIG_SOC_EXYNOS5440) += clk-exynos5440.o obj-$(CONFIG_ARCH_EXYNOS) += clk-exynos-audss.o +obj-$(CONFIG_ARCH_EXYNOS) += clk-exynos-clkout.o obj-$(CONFIG_S3C2410_COMMON_CLK)+= clk-s3c2410.o obj-$(CONFIG_S3C2410_COMMON_DCLK)+= clk-s3c2410-dclk.o obj-$(CONFIG_S3C2412_COMMON_CLK)+= clk-s3c2412.o diff --git a/drivers/clk/samsung/clk-exynos-clkout.c b/drivers/clk/samsung/clk-exynos-clkout.c new file mode 100644 index 0000000..3a7cb25 --- /dev/null +++ b/drivers/clk/samsung/clk-exynos-clkout.c @@ -0,0 +1,153 @@ +/* + * Copyright (c) 2014 Samsung Electronics Co., Ltd. + * Author: Tomasz Figa + * + * 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. + * + * Clock driver for Exynos clock output + */ + +#include +#include +#include +#include +#include +#include + +#define EXYNOS_CLKOUT_NR_CLKS 1 +#define EXYNOS_CLKOUT_PARENTS 32 + +#define EXYNOS_PMU_DEBUG_REG 0xa00 +#define EXYNOS_CLKOUT_DISABLE_SHIFT 0 +#define EXYNOS_CLKOUT_MUX_SHIFT 8 +#define EXYNOS4_CLKOUT_MUX_MASK 0xf +#define EXYNOS5_CLKOUT_MUX_MASK 0x1f + +struct exynos_clkout { + struct clk_gate gate; + struct clk_mux mux; + spinlock_t slock; + struct clk_onecell_data data; + struct clk *clk_table[EXYNOS_CLKOUT_NR_CLKS]; + void __iomem *reg; + u32 pmu_debug_save; +}; + +static struct exynos_clkout *clkout; + +static int exynos_clkout_suspend(void) +{ + clkout->pmu_debug_save = readl(clkout->reg + EXYNOS_PMU_DEBUG_REG); + + return 0; +} + +static void exynos_clkout_resume(void) +{ + writel(clkout->pmu_debug_save, clkout->reg + EXYNOS_PMU_DEBUG_REG); +} + +static struct syscore_ops exynos_clkout_syscore_ops = { + .suspend = exynos_clkout_suspend, + .resume = exynos_clkout_resume, +}; + +static void __init exynos_clkout_init(struct device_node *node, u32 mux_mask) +{ + const char *parent_names[EXYNOS_CLKOUT_PARENTS]; + struct clk *parents[EXYNOS_CLKOUT_PARENTS]; + int parent_count; + int ret; + int i; + + clkout = kzalloc(sizeof(*clkout), GFP_KERNEL); + if (!clkout) + return; + + spin_lock_init(&clkout->slock); + + parent_count = 0; + for (i = 0; i < EXYNOS_CLKOUT_PARENTS; ++i) { + char name[] = "clkoutXX"; + + snprintf(name, sizeof(name), "clkout%d", i); + parents[i] = of_clk_get_by_name(node, name); + if (IS_ERR(parents[i])) { + parent_names[i] = "none"; + continue; + } + + parent_names[i] = __clk_get_name(parents[i]); + parent_count = i + 1; + } + + if (!parent_count) + goto free_clkout; + + clkout->reg = of_iomap(node, 0); + if (!clkout->reg) + goto clks_put; + + clkout->gate.reg = clkout->reg + EXYNOS_PMU_DEBUG_REG; + clkout->gate.bit_idx = EXYNOS_CLKOUT_DISABLE_SHIFT; + clkout->gate.flags = CLK_GATE_SET_TO_DISABLE; + clkout->gate.lock = &clkout->slock; + + clkout->mux.reg = clkout->reg + EXYNOS_PMU_DEBUG_REG; + clkout->mux.mask = mux_mask; + clkout->mux.shift = EXYNOS_CLKOUT_MUX_SHIFT; + clkout->mux.lock = &clkout->slock; + + clkout->clk_table[0] = clk_register_composite(NULL, "clkout", + parent_names, parent_count, &clkout->mux.hw, + &clk_mux_ops, NULL, NULL, &clkout->gate.hw, + &clk_gate_ops, CLK_SET_RATE_PARENT + | CLK_SET_RATE_NO_REPARENT); + if (IS_ERR(clkout->clk_table[0])) + goto err_unmap; + + clkout->data.clks = clkout->clk_table; + clkout->data.clk_num = EXYNOS_CLKOUT_NR_CLKS; + ret = of_clk_add_provider(node, of_clk_src_onecell_get, &clkout->data); + if (ret) + goto err_clk_unreg; + + register_syscore_ops(&exynos_clkout_syscore_ops); + + return; + +err_clk_unreg: + clk_unregister(clkout->clk_table[0]); +err_unmap: + iounmap(clkout->reg); +clks_put: + for (i = 0; i < EXYNOS_CLKOUT_PARENTS; ++i) + if (!IS_ERR(parents[i])) + clk_put(parents[i]); +free_clkout: + kfree(clkout); + + pr_err("%s: failed to register clkout clock\n", __func__); +} + +static void __init exynos4_clkout_init(struct device_node *node) +{ + exynos_clkout_init(node, EXYNOS4_CLKOUT_MUX_MASK); +} +CLK_OF_DECLARE(exynos4210_clkout, "samsung,exynos4210-pmu", + exynos4_clkout_init); +CLK_OF_DECLARE(exynos4212_clkout, "samsung,exynos4212-pmu", + exynos4_clkout_init); +CLK_OF_DECLARE(exynos4412_clkout, "samsung,exynos4412-pmu", + exynos4_clkout_init); + +static void __init exynos5_clkout_init(struct device_node *node) +{ + exynos_clkout_init(node, EXYNOS5_CLKOUT_MUX_MASK); +} +CLK_OF_DECLARE(exynos5250_clkout, "samsung,exynos5250-pmu", + exynos5_clkout_init); +CLK_OF_DECLARE(exynos5420_clkout, "samsung,exynos5420-pmu", + exynos5_clkout_init);