From patchwork Tue Sep 20 15:54:56 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yang Ling X-Patchwork-Id: 9341967 X-Patchwork-Delegate: sboyd@codeaurora.org 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 6D05F607EE for ; Tue, 20 Sep 2016 15:55:11 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5F19A297B6 for ; Tue, 20 Sep 2016 15:55:11 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 524F529866; Tue, 20 Sep 2016 15:55:11 +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=-6.8 required=2.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_HI, T_DKIM_INVALID autolearn=ham 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 D2129297B6 for ; Tue, 20 Sep 2016 15:55:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755033AbcITPzK (ORCPT ); Tue, 20 Sep 2016 11:55:10 -0400 Received: from mail-pf0-f195.google.com ([209.85.192.195]:34098 "EHLO mail-pf0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754803AbcITPzJ (ORCPT ); Tue, 20 Sep 2016 11:55:09 -0400 Received: by mail-pf0-f195.google.com with SMTP id 21so1144624pfy.1; Tue, 20 Sep 2016 08:55:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:cc:subject:message-id:mime-version:content-disposition :user-agent; bh=UHQ5juj6czyfuLwJ4ueAm3ZPdyLGCE6IaeLQLkbyD+Y=; b=lL5mKw2KHUJLDJ5a04hsadMY6kOdGcaCZqBY5J5eNiO2SncYJJ193YtPeAmRfHzj3S SmhROKbSjYoB+ceZgTNrhvPOjS3qpXs/RidHEWdfZTXrL0/bcA8siBIVrE9w/MQjGCPi sSGpo6NXFF5ZiK+VsY4KcQphzc+qT0r2XWdxHTdKSfSoDcJYufOg437TR+K2RD0RdJSs MLOgOUsWJN+9xKndJVtrx5DGnN4ScybRW4MvvWUAHnykXzXhgPV6+fktbpKLD0cyn1qy PgPctq7NFok9KG+xD0/smHNiIdVxwNWzbvCd+/0s6sPkBeRWHqXxVf5S2NZipO5IxcB1 it7g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:date:from:to:cc:subject:message-id:mime-version :content-disposition:user-agent; bh=UHQ5juj6czyfuLwJ4ueAm3ZPdyLGCE6IaeLQLkbyD+Y=; b=R6DuihRqOGFYAkpoOhP8plexcCV9nrXR1Dn9ykNFR2DZTU/dRxaRqFJmCdoUDiH/tq zAO4X8D0F+gJ6duOcAgPhwXfgEYudxzYA84noA6t9uE3yK8o0oEG2sLMg8X9sRp+hcKW 4Z7unIn6IanpqKtFP2XSymftiT+GTB8CvUo2n+FeoxW/RLtFnm0K/p/kxGqN5iwNYkce pD4m+0JKuzhdAmfzCyvJSo31VbKxeZkyoBFbWvJHuQtNX48x6joXg/PHUp9UC3+WSEc/ CzhdEsTeqDpC2kfNVjgRErwQ2LIoOFITi2lZmdcYgAAVe75BuXA6uDOrhiGYpKf89YJm owGw== X-Gm-Message-State: AE9vXwM8SItWxqr3C0XWO12vGoQS4awGoNhMclBZY9OnVGk3RrHxgAG2SQbai9GznYqBxQ== X-Received: by 10.98.22.21 with SMTP id 21mr27306469pfw.4.1474386908429; Tue, 20 Sep 2016 08:55:08 -0700 (PDT) Received: from ubuntu ([121.237.185.127]) by smtp.gmail.com with ESMTPSA id p7sm32543443paa.3.2016.09.20.08.55.02 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Tue, 20 Sep 2016 08:55:07 -0700 (PDT) Date: Tue, 20 Sep 2016 23:54:56 +0800 From: Yang Ling To: mturquette@baylibre.com, sboyd@codeaurora.org, keguang.zhang@gmail.com Cc: linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, linux-mips@linux-mips.org, gnaygnil@gmail.com Subject: [PATCH v3] CLK: Add Loongson1C clock support Message-ID: <20160920155439.GA26095@ubuntu> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) 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 patch adds clock support to Loongson1C SoC. Signed-off-by: Yang Ling --- V3: clk: loongson1c: Migrate to clk_hw based OF and registration APIs. --- V2: Use loongson1 generic clock interface. --- drivers/clk/loongson1/Makefile | 1 + drivers/clk/loongson1/clk-loongson1c.c | 97 ++++++++++++++++++++++++++++++++++ 2 files changed, 98 insertions(+) create mode 100644 drivers/clk/loongson1/clk-loongson1c.c diff --git a/drivers/clk/loongson1/Makefile b/drivers/clk/loongson1/Makefile index 5a162a1..b7f6a16 100644 --- a/drivers/clk/loongson1/Makefile +++ b/drivers/clk/loongson1/Makefile @@ -1,2 +1,3 @@ obj-y += clk.o obj-$(CONFIG_LOONGSON1_LS1B) += clk-loongson1b.o +obj-$(CONFIG_LOONGSON1_LS1C) += clk-loongson1c.o diff --git a/drivers/clk/loongson1/clk-loongson1c.c b/drivers/clk/loongson1/clk-loongson1c.c new file mode 100644 index 0000000..3466f73 --- /dev/null +++ b/drivers/clk/loongson1/clk-loongson1c.c @@ -0,0 +1,97 @@ +/* + * Copyright (c) 2016 Yang Ling + * + * 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. + */ + +#include +#include + +#include +#include "clk.h" + +#define OSC (24 * 1000000) +#define DIV_APB 1 + +static DEFINE_SPINLOCK(_lock); + +static unsigned long ls1x_pll_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + u32 pll, rate; + + pll = __raw_readl(LS1X_CLK_PLL_FREQ); + rate = ((pll >> 8) & 0xff) + ((pll >> 16) & 0xff); + rate *= OSC; + rate >>= 2; + + return rate; +} + +static const struct clk_ops ls1x_pll_clk_ops = { + .recalc_rate = ls1x_pll_recalc_rate, +}; + +static const struct clk_div_table ahb_div_table[] = { + [0] = { .val = 0, .div = 2 }, + [1] = { .val = 1, .div = 4 }, + [2] = { .val = 2, .div = 3 }, + [3] = { .val = 3, .div = 3 }, +}; + +void __init ls1x_clk_init(void) +{ + struct clk_hw *hw; + + hw = clk_hw_register_fixed_rate(NULL, "osc_clk", NULL, 0, OSC); + clk_hw_register_clkdev(hw, "osc_clk", NULL); + + /* clock derived from 24 MHz OSC clk */ + hw = clk_hw_register_pll(NULL, "pll_clk", "osc_clk", + &ls1x_pll_clk_ops, 0); + clk_hw_register_clkdev(hw, "pll_clk", NULL); + + hw = clk_hw_register_divider(NULL, "cpu_clk_div", "pll_clk", + CLK_GET_RATE_NOCACHE, LS1X_CLK_PLL_DIV, + DIV_CPU_SHIFT, DIV_CPU_WIDTH, + CLK_DIVIDER_ONE_BASED | + CLK_DIVIDER_ROUND_CLOSEST, &_lock); + clk_hw_register_clkdev(hw, "cpu_clk_div", NULL); + hw = clk_hw_register_fixed_factor(NULL, "cpu_clk", "cpu_clk_div", + 0, 1, 1); + clk_hw_register_clkdev(hw, "cpu_clk", NULL); + + hw = clk_hw_register_divider(NULL, "dc_clk_div", "pll_clk", + 0, LS1X_CLK_PLL_DIV, DIV_DC_SHIFT, + DIV_DC_WIDTH, CLK_DIVIDER_ONE_BASED, &_lock); + clk_hw_register_clkdev(hw, "dc_clk_div", NULL); + hw = clk_hw_register_fixed_factor(NULL, "dc_clk", "dc_clk_div", + 0, 1, 1); + clk_hw_register_clkdev(hw, "dc_clk", NULL); + + hw = clk_hw_register_divider_table(NULL, "ahb_clk_div", "cpu_clk_div", + 0, LS1X_CLK_PLL_FREQ, DIV_DDR_SHIFT, + DIV_DDR_WIDTH, CLK_DIVIDER_ALLOW_ZERO, + ahb_div_table, &_lock); + clk_hw_register_clkdev(hw, "ahb_clk_div", NULL); + hw = clk_hw_register_fixed_factor(NULL, "ahb_clk", "ahb_clk_div", + 0, 1, 1); + clk_hw_register_clkdev(hw, "ahb_clk", NULL); + clk_hw_register_clkdev(hw, "ls1x-dma", NULL); + clk_hw_register_clkdev(hw, "stmmaceth", NULL); + + /* clock derived from AHB clk */ + hw = clk_hw_register_fixed_factor(NULL, "apb_clk", "ahb_clk", 0, 1, + DIV_APB); + clk_hw_register_clkdev(hw, "apb_clk", NULL); + clk_hw_register_clkdev(hw, "ls1x-ac97", NULL); + clk_hw_register_clkdev(hw, "ls1x-i2c", NULL); + clk_hw_register_clkdev(hw, "ls1x-nand", NULL); + clk_hw_register_clkdev(hw, "ls1x-pwmtimer", NULL); + clk_hw_register_clkdev(hw, "ls1x-spi", NULL); + clk_hw_register_clkdev(hw, "ls1x-wdt", NULL); + clk_hw_register_clkdev(hw, "serial8250", NULL); +}