From patchwork Fri Nov 10 06:36:01 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chunyan Zhang X-Patchwork-Id: 10052437 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A91CF6035D for ; Fri, 10 Nov 2017 06:44:13 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9BCDE2B28E for ; Fri, 10 Nov 2017 06:44:13 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9042C2B290; Fri, 10 Nov 2017 06:44:13 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3B6892B28F for ; Fri, 10 Nov 2017 06:44:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755904AbdKJGnL (ORCPT ); Fri, 10 Nov 2017 01:43:11 -0500 Received: from sci-ig2.spreadtrum.com ([222.66.158.135]:29405 "EHLO SHSQR01.spreadtrum.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1755940AbdKJGnJ (ORCPT ); Fri, 10 Nov 2017 01:43:09 -0500 Received: from ig2.spreadtrum.com (shmbx04.spreadtrum.com [10.0.1.214]) by SHSQR01.spreadtrum.com with ESMTP id vAA6fSoR033213 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 10 Nov 2017 14:41:28 +0800 (CST) (envelope-from Chunyan.Zhang@spreadtrum.com) Received: from SHCAS02.spreadtrum.com (10.0.1.202) by SHMBX04.spreadtrum.com (10.0.1.214) with Microsoft SMTP Server (TLS) id 15.0.847.32; Fri, 10 Nov 2017 14:41:38 +0800 Received: from localhost (10.0.73.143) by SHCAS02.spreadtrum.com (10.0.1.250) with Microsoft SMTP Server (TLS) id 15.0.847.32 via Frontend Transport; Fri, 10 Nov 2017 14:41:38 +0800 From: Chunyan Zhang To: Stephen Boyd , Michael Turquette , Rob Herring , Mark Rutland CC: Catalin Marinas , Will Deacon , , , , , Arnd Bergmann , Mark Brown , Xiaolong Zhang , Ben Li , Orson Zhai , Chunyan Zhang Subject: [PATCH V4 06/12] clk: sprd: add divider clock support Date: Fri, 10 Nov 2017 14:36:01 +0800 Message-ID: <20171110063607.3250-7-chunyan.zhang@spreadtrum.com> X-Mailer: git-send-email 2.12.2 In-Reply-To: <20171110063607.3250-1-chunyan.zhang@spreadtrum.com> References: <20171110063607.3250-1-chunyan.zhang@spreadtrum.com> MIME-Version: 1.0 X-MAIL: SHSQR01.spreadtrum.com vAA6fSoR033213 Sender: linux-clk-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This is a feature that can also be found in sprd composite clocks, provide a bunch of helpers that can be reused in that. Signed-off-by: Chunyan Zhang --- drivers/clk/sprd/Makefile | 1 + drivers/clk/sprd/div.c | 100 ++++++++++++++++++++++++++++++++++++++++++++++ drivers/clk/sprd/div.h | 79 ++++++++++++++++++++++++++++++++++++ 3 files changed, 180 insertions(+) create mode 100644 drivers/clk/sprd/div.c create mode 100644 drivers/clk/sprd/div.h diff --git a/drivers/clk/sprd/Makefile b/drivers/clk/sprd/Makefile index cee36b5..80e6039 100644 --- a/drivers/clk/sprd/Makefile +++ b/drivers/clk/sprd/Makefile @@ -3,3 +3,4 @@ obj-$(CONFIG_SPRD_COMMON_CLK) += clk-sprd.o clk-sprd-y += common.o clk-sprd-y += gate.o clk-sprd-y += mux.o +clk-sprd-y += div.o diff --git a/drivers/clk/sprd/div.c b/drivers/clk/sprd/div.c new file mode 100644 index 0000000..3e08dcd --- /dev/null +++ b/drivers/clk/sprd/div.c @@ -0,0 +1,100 @@ +/* + * Spreadtrum divider clock driver + * + * Copyright (C) 2017 Spreadtrum, Inc. + * Author: Chunyan Zhang + * + * SPDX-License-Identifier: GPL-2.0 + */ + +#include + +#include "div.h" + +DEFINE_SPINLOCK(sprd_div_lock); +EXPORT_SYMBOL_GPL(sprd_div_lock); + +long sprd_div_helper_round_rate(struct sprd_clk_common *common, + const struct sprd_div_internal *div, + unsigned long rate, + unsigned long *parent_rate) +{ + return divider_round_rate(&common->hw, rate, parent_rate, + NULL, div->width, 0); +} +EXPORT_SYMBOL_GPL(sprd_div_helper_round_rate); + +static long sprd_div_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) +{ + struct sprd_div *cd = hw_to_sprd_div(hw); + + return sprd_div_helper_round_rate(&cd->common, &cd->div, + rate, parent_rate); +} + +unsigned long sprd_div_helper_recalc_rate(struct sprd_clk_common *common, + const struct sprd_div_internal *div, + unsigned long parent_rate) +{ + unsigned long val; + unsigned int reg; + + sprd_regmap_read(common->regmap, common->reg, ®); + val = reg >> div->shift; + val &= (1 << div->width) - 1; + + return divider_recalc_rate(&common->hw, parent_rate, val, NULL, 0); +} +EXPORT_SYMBOL_GPL(sprd_div_helper_recalc_rate); + +static unsigned long sprd_div_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct sprd_div *cd = hw_to_sprd_div(hw); + + return sprd_div_helper_recalc_rate(&cd->common, &cd->div, parent_rate); +} + +int sprd_div_helper_set_rate(const struct sprd_clk_common *common, + const struct sprd_div_internal *div, + unsigned long rate, + unsigned long parent_rate) +{ + unsigned long flags; + unsigned long val; + unsigned int reg; + + val = divider_get_val(rate, parent_rate, NULL, + div->width, 0); + + spin_lock_irqsave(common->lock, flags); + + sprd_regmap_read(common->regmap, common->reg, ®); + reg &= ~GENMASK(div->width + div->shift - 1, div->shift); + + sprd_regmap_write(common->regmap, common->reg, + reg | (val << div->shift)); + + spin_unlock_irqrestore(common->lock, flags); + + return 0; + +} +EXPORT_SYMBOL_GPL(sprd_div_helper_set_rate); + +static int sprd_div_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct sprd_div *cd = hw_to_sprd_div(hw); + + return sprd_div_helper_set_rate(&cd->common, &cd->div, + rate, parent_rate); +} + +const struct clk_ops sprd_div_ops = { + .recalc_rate = sprd_div_recalc_rate, + .round_rate = sprd_div_round_rate, + .set_rate = sprd_div_set_rate, +}; +EXPORT_SYMBOL_GPL(sprd_div_ops); diff --git a/drivers/clk/sprd/div.h b/drivers/clk/sprd/div.h new file mode 100644 index 0000000..fa47773 --- /dev/null +++ b/drivers/clk/sprd/div.h @@ -0,0 +1,79 @@ +/* + * Spreadtrum divider clock driver + * + * Copyright (C) 2017 Spreadtrum, Inc. + * Author: Chunyan Zhang + * + * SPDX-License-Identifier: GPL-2.0 + */ + +#ifndef _SPRD_DIV_H_ +#define _SPRD_DIV_H_ + +#include "common.h" + +/** + * struct sprd_div_internal - Internal divider description + * @shift: Bit offset of the divider in its register + * @width: Width of the divider field in its register + * + * That structure represents a single divider, and is meant to be + * embedded in other structures representing the various clock + * classes. + */ +struct sprd_div_internal { + u8 shift; + u8 width; +}; + +#define _SPRD_DIV_CLK(_shift, _width) \ + { \ + .shift = _shift, \ + .width = _width, \ + } + +struct sprd_div { + struct sprd_div_internal div; + struct sprd_clk_common common; +}; + +#define SPRD_DIV_CLK(_struct, _name, _parent, _reg, \ + _shift, _width, _flags) \ + struct sprd_div _struct = { \ + .div = _SPRD_DIV_CLK(_shift, _width), \ + .common = { \ + .regmap = NULL, \ + .reg = _reg, \ + .lock = &sprd_div_lock, \ + .hw.init = CLK_HW_INIT(_name, \ + _parent, \ + &sprd_div_ops, \ + _flags), \ + } \ + } + +static inline struct sprd_div *hw_to_sprd_div(const struct clk_hw *hw) +{ + struct sprd_clk_common *common = hw_to_sprd_clk_common(hw); + + return container_of(common, struct sprd_div, common); +} + +long sprd_div_helper_round_rate(struct sprd_clk_common *common, + const struct sprd_div_internal *div, + unsigned long rate, + unsigned long *parent_rate); + +unsigned long sprd_div_helper_recalc_rate(struct sprd_clk_common *common, + const struct sprd_div_internal *div, + unsigned long parent_rate); + +int sprd_div_helper_set_rate(const struct sprd_clk_common *common, + const struct sprd_div_internal *div, + unsigned long rate, + unsigned long parent_rate); + +extern const struct clk_ops sprd_div_ops; +extern spinlock_t sprd_div_lock; + +#endif /* _SPRD_DIV_H_ */