From patchwork Fri Jul 26 04:32:12 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Haojian Zhuang X-Patchwork-Id: 2833776 Return-Path: X-Original-To: patchwork-linux-arm@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 57DD9C0319 for ; Fri, 26 Jul 2013 04:35:27 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D70ED20190 for ; Fri, 26 Jul 2013 04:35:25 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1BE0F20178 for ; Fri, 26 Jul 2013 04:35:24 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1V2ZkH-0008UY-RI; Fri, 26 Jul 2013 04:35:14 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1V2ZkB-0005y7-NR; Fri, 26 Jul 2013 04:35:07 +0000 Received: from mail-pd0-f174.google.com ([209.85.192.174]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1V2Zk0-0005wO-KC for linux-arm-kernel@lists.infradead.org; Fri, 26 Jul 2013 04:35:01 +0000 Received: by mail-pd0-f174.google.com with SMTP id 3so1453207pdj.33 for ; Thu, 25 Jul 2013 21:34:35 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references :x-gm-message-state; bh=7AoVioHxIdLzSU1iu8rlCRL6dle3CVYOUbowAcqF5+U=; b=c1XOKPhpx7Firu1aAr0bp8ZiOWuuByhNOcGL97MfA/jv8hg2HYN+7GG7jCuXEV+oor GUjwwKq5po2oulrwTiMdr/SCGGd0cIwHot5F4B9guDW/mgXZoyFyizQyfyMXB0JHo6Us Nr8sS2+NLQwh7V+OJCWtVZgW17TQUBiQ5K1uvynIM3+qmlN86XFgnEk20vYAtxi3qJTf ZdbtlC7L/Iviyo74AsdloCzQybGvrtzVRwSUmYMGRrSz2mq3Rtk8YFfI4n043mVcIpG7 2g19DtWk+bF8lJbPkpYdAQqYI/8e0jLxHWcqV3DXbXWGKtddWJ/cJyC1pZ3hIqMr46h4 DebA== X-Received: by 10.68.69.108 with SMTP id d12mr50827819pbu.187.1374813275150; Thu, 25 Jul 2013 21:34:35 -0700 (PDT) Received: from localhost.localdomain ([67.229.68.101]) by mx.google.com with ESMTPSA id is3sm51351497pbc.25.2013.07.25.21.34.29 for (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 25 Jul 2013 21:34:34 -0700 (PDT) From: Haojian Zhuang To: arnd@arndb.de, linux@arm.linux.org.uk, linus.walleij@linaro.org, olof@lixom.net, rob.herring@calxeda.com, linux-arm-kernel@lists.infradead.org, tglx@linutronix.de, john.stultz@linaro.org, mturquette@linaro.org Subject: [PATCH v6 1/4] clk: hi3xxx: add clock support Date: Fri, 26 Jul 2013 12:32:12 +0800 Message-Id: <1374813135-16238-2-git-send-email-haojian.zhuang@linaro.org> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1374813135-16238-1-git-send-email-haojian.zhuang@linaro.org> References: <1374813135-16238-1-git-send-email-haojian.zhuang@linaro.org> X-Gm-Message-State: ALoCoQnbim172KxsYChBT59J6wFObCuZD+/4Ks9lR1DF6DPKxSa49bbiuRlJ1tlfRBLYnNU+Yd7a X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130726_003456_927502_A474A53A X-CRM114-Status: GOOD ( 26.39 ) X-Spam-Score: -1.9 (-) Cc: Haojian Zhuang , patches@linaro.org 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=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, 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 clock support with device tree on Hisilicon SoC. Signed-off-by: Haojian Zhuang Cc: Mike Turquette --- .../devicetree/bindings/clock/hisilicon.txt | 66 ++++ drivers/clk/Makefile | 1 + drivers/clk/clk-hi3xxx.c | 398 +++++++++++++++++++++ 3 files changed, 465 insertions(+) create mode 100644 Documentation/devicetree/bindings/clock/hisilicon.txt create mode 100644 drivers/clk/clk-hi3xxx.c diff --git a/Documentation/devicetree/bindings/clock/hisilicon.txt b/Documentation/devicetree/bindings/clock/hisilicon.txt new file mode 100644 index 0000000..5d7a220 --- /dev/null +++ b/Documentation/devicetree/bindings/clock/hisilicon.txt @@ -0,0 +1,66 @@ +Device Tree Clock bindings for arch-hi3xxx + +This binding uses the common clock binding[1]. + +[1] Documentation/devicetree/bindings/clock/clock-bindings.txt + +Required properties for mux clocks: + - compatible : Shall be "hisilicon,hi3620-clk-mux". + - clocks : shall be the input parent clock phandle for the clock. This should + be the reference clock. + - clock-output-names : shall be reference name. + - #clock-cells : from common clock binding; shall be set to 0. + - clkmux-reg : array of mux register offset & mask bits + - clkmux-table : array of mux select bits + +Required properties for Hi3620 gate clocks: + - compatible : Shall be "hisilicon,hi3620-clk-gate". + - clocks : shall be the input parent clock phandle for the clock. This should + be the reference clock. + - clock-output-names : shall be reference name. + - #clock-cells : from common clock binding; shall be set to 0. + - hi3620-clkgate : array of enable register offset & enable bits + - hi3620-clkreset : array of reset register offset & enable bits + +Required properties for clock divider: + - compatible : Shall be "hisilicon,hi3620-clk-div". + - clocks : shall be the input parent clock phandle for the clock. This should + be the reference clock. + - clock-output-names : shall be reference name. + - #clock-cells : from common clock binding; shall be set to 0. + - #clkdiv-table-cells : the number of parameters after phandle in + clkdiv-table property. + - clkdiv-table : list of value that are used to configure clock + divider. They're value of phandle, index & divider value. + - clkdiv : array of divider register offset & mask bits. + +Required properties for gate clocks: + - compatible : Shall be "hisilicon,clk-gate". + - clocks : shall be the input parent clock phandle for the clock. This should + be the reference clock. + - clock-output-names : shall be reference name. + - #clock-cells : from common clock binding; shall be set to 0. + - clkgate-inverted : bool value. True means that set-to-disable. + +For example: + timclk1: clkgate@38 { + compatible = "hisilicon,clk-gate"; + #clock-cells = <0>; + clocks = <&refclk_timer1>; + clock-output-names = "timclk1"; + clkgate-inverted; + clkgate = <0 18>; + }; + + dtable: clkdiv@0 { + #clkdiv-table-cells = <2>; + }; + + div_cfgaxi: clkdiv@2 { + compatible = "hisilicon,hi3620-clk-div"; + #clock-cells = <0>; + clocks = <&div_shareaxi>; + clock-output-names = "cfgAXI_div"; + clkdiv-table = <&dtable 0x01 2>; + clkdiv = <0x100 0x60>; + }; diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 4038c2b..21076ee 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -12,6 +12,7 @@ obj-$(CONFIG_COMMON_CLK) += clk-composite.o # SoCs specific obj-$(CONFIG_ARCH_BCM2835) += clk-bcm2835.o obj-$(CONFIG_ARCH_NOMADIK) += clk-nomadik.o +obj-$(CONFIG_ARCH_HI3xxx) += clk-hi3xxx.o obj-$(CONFIG_ARCH_HIGHBANK) += clk-highbank.o obj-$(CONFIG_ARCH_NSPIRE) += clk-nspire.o obj-$(CONFIG_ARCH_MXS) += mxs/ diff --git a/drivers/clk/clk-hi3xxx.c b/drivers/clk/clk-hi3xxx.c new file mode 100644 index 0000000..3b041fd --- /dev/null +++ b/drivers/clk/clk-hi3xxx.c @@ -0,0 +1,398 @@ +/* + * Hisilicon clock driver + * + * Copyright (c) 2012-2013 Hisilicon Limited. + * Copyright (c) 2012-2013 Linaro Limited. + * + * Author: Haojian Zhuang + * Xin Li + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define HI3620_DISABLE_OFF 0x4 +#define HI3620_STATUS_OFF 0x8 + +struct hi3620_periclk { + struct clk_hw hw; + void __iomem *enable; /* enable register */ + void __iomem *reset; /* reset register */ + u32 ebits; /* bits in enable/disable register */ + u32 rbits; /* bits in reset/unreset register */ + spinlock_t *lock; +}; + +static void __iomem *hi3xxx_clk_base = NULL; + +static DEFINE_SPINLOCK(hi3xxx_clk_lock); + +static const struct of_device_id hi3xxx_of_match[] = { + { .compatible = "hisilicon,sctrl" }, +}; + +static void __iomem __init *hi3xxx_init_clocks(struct device_node *np) +{ + struct device_node *parent; + const struct of_device_id *match; + void __iomem *ret = NULL; + + parent = of_get_parent(np); + if (!parent) { + pr_warn("Can't find parent node of these clocks\n"); + goto out; + } + match = of_match_node(hi3xxx_of_match, parent); + if (!match) { + pr_warn("Can't find the right parent\n"); + goto out; + } + + if (!hi3xxx_clk_base) { + ret = of_iomap(parent, 0); + WARN_ON(!ret); + hi3xxx_clk_base = ret; + } else { + ret = hi3xxx_clk_base; + } +out: + return ret; +} + +static int hi3620_clkgate_prepare(struct clk_hw *hw) +{ + struct hi3620_periclk *pclk; + unsigned long flags = 0; + + pclk = container_of(hw, struct hi3620_periclk, hw); + + if (pclk->lock) + spin_lock_irqsave(pclk->lock, flags); + if (pclk->reset) { + writel_relaxed(pclk->rbits, pclk->reset + HI3620_DISABLE_OFF); + readl_relaxed(pclk->reset + HI3620_STATUS_OFF); + } + if (pclk->lock) + spin_unlock_irqrestore(pclk->lock, flags); + return 0; +} + +static int hi3620_clkgate_enable(struct clk_hw *hw) +{ + struct hi3620_periclk *pclk; + unsigned long flags = 0; + + pclk = container_of(hw, struct hi3620_periclk, hw); + if (pclk->lock) + spin_lock_irqsave(pclk->lock, flags); + writel_relaxed(pclk->ebits, pclk->enable); + readl_relaxed(pclk->enable + HI3620_STATUS_OFF); + if (pclk->lock) + spin_unlock_irqrestore(pclk->lock, flags); + return 0; +} + +static void hi3620_clkgate_disable(struct clk_hw *hw) +{ + struct hi3620_periclk *pclk; + unsigned long flags = 0; + + pclk = container_of(hw, struct hi3620_periclk, hw); + if (pclk->lock) + spin_lock_irqsave(pclk->lock, flags); + writel_relaxed(pclk->ebits, pclk->enable + HI3620_DISABLE_OFF); + readl_relaxed(pclk->enable + HI3620_STATUS_OFF); + if (pclk->lock) + spin_unlock_irqrestore(pclk->lock, flags); +} + +static struct clk_ops hi3620_clkgate_ops = { + .prepare = hi3620_clkgate_prepare, + .enable = hi3620_clkgate_enable, + .disable = hi3620_clkgate_disable, +}; + +static void __init hi3620_clkgate_setup(struct device_node *np) +{ + struct hi3620_periclk *pclk; + struct clk_init_data *init; + struct clk *clk; + const char *clk_name, *name, **parent_names; + u32 rdata[2], gdata[2]; + void __iomem *base; + + base = hi3xxx_init_clocks(np); + if (!base) + return; + + if (of_property_read_string(np, "clock-output-names", &clk_name)) + return; + if (of_property_read_u32_array(np, "hi3620-clkgate", + &gdata[0], 2)) + return; + + /* gate only has the fixed parent */ + parent_names = kzalloc(sizeof(char *), GFP_KERNEL); + if (!parent_names) + return; + parent_names[0] = of_clk_get_parent_name(np, 0); + + pclk = kzalloc(sizeof(*pclk), GFP_KERNEL); + if (!pclk) + goto err_pclk; + + init = kzalloc(sizeof(*init), GFP_KERNEL); + if (!init) + goto err_init; + init->name = kstrdup(clk_name, GFP_KERNEL); + init->ops = &hi3620_clkgate_ops; + init->flags = CLK_SET_RATE_PARENT; + init->parent_names = parent_names; + init->num_parents = 1; + + if (!of_property_read_u32_array(np, "hi3620-clkreset", + &rdata[0], 2)) { + pclk->reset = base + rdata[0]; + pclk->rbits = rdata[1]; + } + pclk->enable = base + gdata[0]; + pclk->ebits = gdata[1]; + pclk->lock = &hi3xxx_clk_lock; + pclk->hw.init = init; + + clk = clk_register(NULL, &pclk->hw); + if (IS_ERR(clk)) + goto err_clk; + if (!of_property_read_string(np, "clock-names", &name)) + clk_register_clkdev(clk, name, NULL); + of_clk_add_provider(np, of_clk_src_simple_get, clk); + return; +err_clk: + kfree(init); +err_init: + kfree(pclk); +err_pclk: + kfree(parent_names); +} +CLK_OF_DECLARE(hi3620_gate, "hisilicon,hi3620-clk-gate", hi3620_clkgate_setup) + +static int __init hi3xxx_parse_mux(struct device_node *np, + u8 *num_parents, + u32 *table) +{ + int i, cnt, ret; + + /* get the count of items in mux */ + for (i = 0, cnt = 0; ; i++, cnt++) { + /* parent's #clock-cells property is always 0 */ + if (!of_parse_phandle(np, "clocks", i)) + break; + } + + for (i = 0; i < cnt; i++) { + if (!of_clk_get_parent_name(np, i)) + return -ENOENT; + } + *num_parents = cnt; + table = kzalloc(sizeof(u32 *) * cnt, GFP_KERNEL); + if (!table) + return -ENOMEM; + ret = of_property_read_u32_array(np, "clkmux-table", + table, cnt); + if (ret) + goto err; + return 0; +err: + kfree(table); + return ret; +} + +static void __init clkmux_setup(struct device_node *np, int mode) +{ + struct clk *clk; + const char *clk_name, **parent_names = NULL; + u32 rdata[2], mask, *table = NULL; + u8 num_parents, shift, clk_mux_flags = 0; + void __iomem *reg, *base; + int i, ret; + + base = hi3xxx_init_clocks(np); + if (!base) + return; + + if (of_property_read_string(np, "clock-output-names", &clk_name)) + return; + if (of_property_read_u32_array(np, "clkmux-reg", + &rdata[0], 2)) + return; + ret = hi3xxx_parse_mux(np, &num_parents, table); + if (ret) + return; + + parent_names = kzalloc(sizeof(char *) * num_parents, GFP_KERNEL); + if (!parent_names) + goto err; + for (i = 0; i < num_parents; i++) + parent_names[i] = of_clk_get_parent_name(np, i); + + reg = base + rdata[0]; + shift = ffs(rdata[1]) - 1; + mask = rdata[1] >> shift; + if (mode) + clk_mux_flags = CLK_MUX_HIWORD_MASK; + clk = clk_register_mux_table(NULL, clk_name, parent_names, num_parents, + CLK_SET_RATE_PARENT, reg, shift, mask, + clk_mux_flags, table, &hi3xxx_clk_lock); + if (IS_ERR(clk)) + goto err_clk; + of_clk_add_provider(np, of_clk_src_simple_get, clk); + + return; +err_clk: + kfree(parent_names); +err: + kfree(table); +} + +static void __init hi3620_clkmux_setup(struct device_node *np) +{ + clkmux_setup(np, 1); +} +CLK_OF_DECLARE(hi3620_mux, "hisilicon,hi3620-clk-mux", hi3620_clkmux_setup) + +static void __init hi3xxx_clkmux_setup(struct device_node *np) +{ + clkmux_setup(np, 0); +} +CLK_OF_DECLARE(hi3xxx_mux, "hisilicon,clk-mux", hi3xxx_clkmux_setup) + +static void __init hs_clkgate_setup(struct device_node *np) +{ + struct clk *clk; + const char *clk_name, **parent_names, *name; + unsigned long flags = 0; + u32 data[2]; + void __iomem *base; + + base = hi3xxx_init_clocks(np); + if (!base) + return; + if (of_property_read_string(np, "clock-output-names", &clk_name)) + return; + if (of_property_read_u32_array(np, "clkgate", + &data[0], 2)) + return; + if (of_property_read_bool(np, "clkgate-inverted")) + flags = CLK_GATE_SET_TO_DISABLE; + /* gate only has the fixed parent */ + parent_names = kzalloc(sizeof(char *), GFP_KERNEL); + if (!parent_names) + return; + parent_names[0] = of_clk_get_parent_name(np, 0); + + clk = clk_register_gate(NULL, clk_name, parent_names[0], 0, + base + data[0], (u8)data[1], flags, + &hi3xxx_clk_lock); + if (IS_ERR(clk)) + goto err; + if (!of_property_read_string(np, "clock-names", &name)) + clk_register_clkdev(clk, name, NULL); + of_clk_add_provider(np, of_clk_src_simple_get, clk); + return; +err: + kfree(parent_names); +} +CLK_OF_DECLARE(hs_gate, "hisilicon,clk-gate", hs_clkgate_setup) + +void __init hi3620_clkdiv_setup(struct device_node *np) +{ + struct clk *clk; + const char *clk_name, **parent_names; + struct clk_div_table *table; + unsigned int table_num; + int i; + u32 data[2]; + u8 shift, width; + const char *propname = "clkdiv-table"; + const char *cellname = "#clkdiv-table-cells"; + struct of_phandle_args div_table; + void __iomem *reg, *base; + + base = hi3xxx_init_clocks(np); + if (!base) + return; + + if (of_property_read_string(np, "clock-output-names", &clk_name)) + return; + if (of_property_read_u32_array(np, "clkdiv", &data[0], 2)) + return; + + /*process the div_table*/ + for (i = 0; ; i++) { + if (of_parse_phandle_with_args(np, propname, cellname, + i, &div_table)) + break; + } + + /*table ends with <0, 0>, so plus one to table_num*/ + table_num = i + 1; + + table = kzalloc(sizeof(struct clk_div_table) * table_num, GFP_KERNEL); + if (!table) + return ; + + for (i = 0; ; i++) { + if (of_parse_phandle_with_args(np, propname, cellname, + i, &div_table)) + break; + + table[i].val = div_table.args[0]; + table[i].div = div_table.args[1]; + } + + /* gate only has the fixed parent */ + parent_names = kzalloc(sizeof(char *), GFP_KERNEL); + if (!parent_names) + goto err_par; + parent_names[0] = of_clk_get_parent_name(np, 0); + reg = base + data[0]; + shift = ffs(data[1]) - 1; + width = fls(data[1]) - ffs(data[1]) + 1; + clk = clk_register_divider_table(NULL, clk_name, parent_names[0], 0, + reg, shift, width, + CLK_DIVIDER_HIWORD_MASK, + table, &hi3xxx_clk_lock); + if (IS_ERR(clk)) + goto err_clk; + of_clk_add_provider(np, of_clk_src_simple_get, clk); + return; +err_clk: + kfree(parent_names); +err_par: + kfree(table); +} +CLK_OF_DECLARE(hi3620_div, "hisilicon,hi3620-clk-div", hi3620_clkdiv_setup)