From patchwork Thu Apr 21 08:04:04 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Stanley X-Patchwork-Id: 8896861 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 [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id B9CCBBF440 for ; Thu, 21 Apr 2016 08:07:16 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id E9ABB202F8 for ; Thu, 21 Apr 2016 08:07:13 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 006E020303 for ; Thu, 21 Apr 2016 08:07:13 +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 1at9cb-0005Ks-Dc; Thu, 21 Apr 2016 08:05:57 +0000 Received: from mail-pa0-x230.google.com ([2607:f8b0:400e:c03::230]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1at9c0-0003cH-9V for linux-arm-kernel@lists.infradead.org; Thu, 21 Apr 2016 08:05:21 +0000 Received: by mail-pa0-x230.google.com with SMTP id r5so24212808pag.1 for ; Thu, 21 Apr 2016 01:04:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=jms.id.au; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=++9AJFbVA1Vj9iujlKH+mD/PWtgnQBuPJGHmrvpd/cQ=; b=PivRAyEEZJ7diBW/o1nRXTiWbQS3sS3LWYbETf8lC6jQHLYqdMFwXNOCszwpkbqebr ZBipUojscUnpqbuhMbD81qgA8yLa1KLTsc/iVQq3JHTCeMu0/qm9sEQHsQz4x2YValSG bG8BJHoSH1oV2RAKugxH/h+xzKElNM9VLbedU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=++9AJFbVA1Vj9iujlKH+mD/PWtgnQBuPJGHmrvpd/cQ=; b=UTfB6Ye+MebwYilN1sRSzegUOoveFFT8ge1FvqxTc/is3OhDzQiR02ivqt8llEAWB5 N2E5TjC6MLbnOAzZmCJwrCpLYeWiQMjyOSxISkTrtiBjafvjMYxbPUsgTYu7OvgK7Q/Q ZoRTPSbTNuk26z16bLiBVy686xs1dKE647PAJ7vYDNQo5qa4E/mH8Qv2ZRRo6Ob4iOZ2 thoQEMcjEjWCIBkUt1MK2HhjVxjyTEwBuiaNyvqTg7/IuWrpKF4KxhZpCU2CorevZysO KPv0d+6+6ciqHXzIkaq8o4KgVICgnrMxis62j/0mfPXv18hU6yJz617854UlWZ6UTJPG NmoA== X-Gm-Message-State: AOPr4FWAFqThPpgjRmlE6DUD8at1G6ZDu7G50RVawhFgcpAmN3GrfE3HUsvXmB/rFUNyLg== X-Received: by 10.66.235.129 with SMTP id um1mr18525060pac.17.1461225899561; Thu, 21 Apr 2016 01:04:59 -0700 (PDT) Received: from icarus.au.ibm.com ([203.0.153.9]) by smtp.gmail.com with ESMTPSA id uw2sm2650897pac.10.2016.04.21.01.04.54 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 21 Apr 2016 01:04:57 -0700 (PDT) From: Joel Stanley To: linux-arm-kernel@lists.infradead.org, arnd@arndb.de Subject: [PATCH v2 06/11] clk: Add driver for Aspeed fourth gen SoCs Date: Thu, 21 Apr 2016 17:34:04 +0930 Message-Id: <1461225849-28074-7-git-send-email-joel@jms.id.au> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1461225849-28074-1-git-send-email-joel@jms.id.au> References: <1461225849-28074-1-git-send-email-joel@jms.id.au> In-Reply-To: <1460627269-21721-1-git-send-email-joel@jms.id.au> References: <1460627269-21721-1-git-send-email-joel@jms.id.au> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160421_010520_484020_E324F0F7 X-CRM114-Status: GOOD ( 18.92 ) X-Spam-Score: -2.7 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: benh@kernel.crashing.org, jk@ozlabs.org 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=-5.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED,RP_MATCHES_RCVD,T_DKIM_INVALID,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 A simple driver to create fixed rate clock devices from srapping registers. Signed-off-by: Joel Stanley --- drivers/clk/Makefile | 1 + drivers/clk/clk-aspeed-g4.c | 106 ++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 107 insertions(+) create mode 100644 drivers/clk/clk-aspeed-g4.c diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 46869d696e4d..bd28f6c95aa1 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -84,3 +84,4 @@ obj-$(CONFIG_X86) += x86/ obj-$(CONFIG_ARCH_ZX) += zte/ obj-$(CONFIG_ARCH_ZYNQ) += zynq/ obj-$(CONFIG_H8300) += h8300/ +obj-$(CONFIG_ARCH_ASPEED) += clk-aspeed-g4.o diff --git a/drivers/clk/clk-aspeed-g4.c b/drivers/clk/clk-aspeed-g4.c new file mode 100644 index 000000000000..36feba2a0859 --- /dev/null +++ b/drivers/clk/clk-aspeed-g4.c @@ -0,0 +1,106 @@ +/* + * Copyright 2016 IBM Corporation + * + * 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 +#include + +static void __init aspeed_of_hpll_clk_init(struct device_node *node) +{ + struct clk *clk, *clkin_clk; + void __iomem *base; + int reg, rate, clkin; + const char *name = node->name; + const char *parent_name; + const int rates[][4] = { + {384, 360, 336, 408}, + {400, 375, 350, 425}, + }; + + of_property_read_string(node, "clock-output-names", &name); + parent_name = of_clk_get_parent_name(node, 0); + + base = of_iomap(node, 0); + if (!base) { + pr_err("%s: of_iomap failed\n", node->full_name); + return; + } + reg = readl(base) >> 8 & 0x2; + iounmap(base); + + clkin_clk = of_clk_get(node, 0); + if (IS_ERR(clkin_clk)) { + pr_err("%s: of_clk_get failed\n", node->full_name); + return; + } + + clkin = clk_get_rate(clkin_clk); + + if (clkin == 48000000 || clkin == 24000000) + rate = rates[0][reg] * 1000000; + else if (clkin == 25000000) + rate = rates[1][reg] * 1000000; + else { + pr_err("%s: unknown clkin frequency %dHz\n", + node->full_name, clkin); + WARN_ON(1); + } + + clk = clk_register_fixed_rate(NULL, name, parent_name, 0, rate); + if (IS_ERR(clk)) { + pr_err("%s: failed to register clock\n", node->full_name); + return; + } + + clk_register_clkdev(clk, NULL, name); + of_clk_add_provider(node, of_clk_src_simple_get, clk); +} +CLK_OF_DECLARE(aspeed_hpll_clock, "aspeed,g4-hpll-clock", + aspeed_of_hpll_clk_init); + +static void __init aspeed_of_apb_clk_init(struct device_node *node) +{ + struct clk *clk, *hpll_clk; + void __iomem *base; + int reg, rate; + const char *name = node->name; + const char *parent_name; + + of_property_read_string(node, "clock-output-names", &name); + parent_name = of_clk_get_parent_name(node, 0); + + base = of_iomap(node, 0); + if (!base) { + pr_err("%s: of_iomap failed\n", node->full_name); + return; + } + reg = readl(base) >> 23 & 0x3; + iounmap(base); + + hpll_clk = of_clk_get(node, 0); + if (IS_ERR(hpll_clk)) { + pr_err("%s: of_clk_get failed\n", node->full_name); + return; + } + + rate = clk_get_rate(hpll_clk) / (2 + 2 * reg); + + clk = clk_register_fixed_rate(NULL, name, parent_name, 0, rate); + if (IS_ERR(clk)) { + pr_err("%s: failed to register clock\n", node->full_name); + return; + } + + clk_register_clkdev(clk, NULL, name); + of_clk_add_provider(node, of_clk_src_simple_get, clk); +} +CLK_OF_DECLARE(aspeed_apb_clock, "aspeed,g4-apb-clock", + aspeed_of_apb_clk_init);