From patchwork Sun Sep 29 03:49:35 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Emilio_L=C3=B3pez?= X-Patchwork-Id: 2959791 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 5AAA39F1BF for ; Sun, 29 Sep 2013 04:05:43 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 4E57020240 for ; Sun, 29 Sep 2013 04:05:42 +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 286F620237 for ; Sun, 29 Sep 2013 04:05:41 +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 1VQ83m-0006J6-1z; Sun, 29 Sep 2013 03:52:43 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1VQ835-00070N-Fy; Sun, 29 Sep 2013 03:51:59 +0000 Received: from zetta.elopez.com.ar ([199.30.59.35]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VQ81t-0006s7-PT for linux-arm-kernel@lists.infradead.org; Sun, 29 Sep 2013 03:50:48 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=elopez.com.ar; s=mail; h=Content-Transfer-Encoding:Content-Type:MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From; bh=mDxDcvKADsCas+N3m6Buni1V3coNwHXKdIBcD7mM1qg=; b=XMiHA7bB0TqQR3MrZhFsqvWpwalJ7QEfhlw4Z7ULrpQfqjtFEmBhvrU3ikPHNHUjHnb4zRIg9vsfX2un+X+7YugeniluLnyP/ZmvNnpJDHWO/X0vojgiUFd4Kj6ovO1fCd5yvnwlPutimf5XTmw/Litaykn26qGQHHYJEz7ocgtkns3VRs19kyZNNpwZEQ7FCQrTybqzFUjOWR524K26Lzgt22JcYVqiNs0iJH03PEEV0J97cfusBGJus6AYG4DC+lGX2XaaUcgpSvV0bcLhBZ16O0xxRYMSQeFqc7LhOI8xasjDR1Kknh7+eotHJAdPT6RpX3W+KvK6eI5ubM3u1A==; Received: from 201-212-126-35.prima.net.ar ([201.212.126.35] helo=desktop.lan) by zetta.elopez.com.ar with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) id 1VQ81Y-0001iw-Gl; Sun, 29 Sep 2013 00:50:24 -0300 From: =?UTF-8?q?Emilio=20L=C3=B3pez?= To: Mike Turquette , Maxime Ripard Subject: [PATCH 06/10] clk: sunxi: mod0 support Date: Sun, 29 Sep 2013 00:49:35 -0300 Message-Id: <1380426579-32458-7-git-send-email-emilio@elopez.com.ar> X-Mailer: git-send-email 1.8.4 In-Reply-To: <1380426579-32458-1-git-send-email-emilio@elopez.com.ar> References: <1380426579-32458-1-git-send-email-emilio@elopez.com.ar> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130928_235046_152144_B5E3D9C3 X-CRM114-Status: GOOD ( 13.86 ) X-Spam-Score: -4.4 (----) Cc: =?UTF-8?q?Emilio=20L=C3=B3pez?= , linux-arm-kernel@lists.infradead.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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-6.5 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 This commit implements support for the "module 0" type of clocks, as used by MMC, IR, NAND, SATA and other components. Signed-off-by: Emilio López --- Documentation/devicetree/bindings/clock/sunxi.txt | 1 + drivers/clk/sunxi/clk-sunxi.c | 57 +++++++++++++++++++++++ 2 files changed, 58 insertions(+) diff --git a/Documentation/devicetree/bindings/clock/sunxi.txt b/Documentation/devicetree/bindings/clock/sunxi.txt index 773f3ae..ff3f61c 100644 --- a/Documentation/devicetree/bindings/clock/sunxi.txt +++ b/Documentation/devicetree/bindings/clock/sunxi.txt @@ -35,6 +35,7 @@ Required properties: "allwinner,sun7i-a20-apb1-gates-clk" - for the APB1 gates on A20 "allwinner,sun6i-a31-apb2-div-clk" - for the APB2 gates on A31 "allwinner,sun6i-a31-apb2-gates-clk" - for the APB2 gates on A31 + "allwinner,sun4i-mod0-clk" - for the module 0 family of clocks Required properties for all clocks: - reg : shall be the control register address for the clock. diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c index b1210f3..163a3d8 100644 --- a/drivers/clk/sunxi/clk-sunxi.c +++ b/drivers/clk/sunxi/clk-sunxi.c @@ -287,6 +287,47 @@ static void sun4i_get_apb1_factors(u32 *freq, u32 parent_rate, /** + * sun4i_get_mod0_factors() - calculates m, n factors for MOD0-style clocks + * MMC rate is calculated as follows + * rate = (parent_rate >> p) / (m + 1); + */ + +static void sun4i_get_mod0_factors(u32 *freq, u32 parent_rate, + u8 *n, u8 *k, u8 *m, u8 *p) +{ + u8 div, calcm, calcp; + + /* These clocks can only divide, so we will never be able to achieve + * frequencies higher than the parent frequency */ + if (*freq > parent_rate) + *freq = parent_rate; + + div = parent_rate / *freq; + + if (div < 16) + calcp = 0; + else if (div / 2 < 16) + calcp = 1; + else if (div / 4 < 16) + calcp = 2; + else + calcp = 3; + + calcm = DIV_ROUND_UP(div, 1 << calcp); + + *freq = (parent_rate >> calcp) / calcm; + + /* we were called to round the frequency, we can now return */ + if (n == NULL) + return; + + *m = calcm - 1; + *p = calcp; +} + + + +/** * sunxi_factors_clk_setup() - Setup function for factor clocks */ @@ -333,6 +374,14 @@ static struct clk_factors_config sun4i_apb1_config = { .pwidth = 2, }; +/* user manual says "n" but it's really "p" */ +static struct clk_factors_config sun4i_mod0_config = { + .mshift = 0, + .mwidth = 4, + .pshift = 16, + .pwidth = 2, +}; + static const struct factors_data sun4i_pll1_data __initconst = { .enable = 31, .table = &sun4i_pll1_config, @@ -356,6 +405,13 @@ static const struct factors_data sun4i_apb1_data __initconst = { .getter = sun4i_get_apb1_factors, }; +static const struct factors_data sun4i_mod0_data __initconst = { + .enable = 31, + .mux = 24, + .table = &sun4i_mod0_config, + .getter = sun4i_get_mod0_factors, +}; + static struct clk * __init sunxi_factors_clk_setup(struct device_node *node, const struct factors_data *data) { @@ -779,6 +835,7 @@ static const struct of_device_id clk_factors_match[] __initconst = { {.compatible = "allwinner,sun4i-pll1-clk", .data = &sun4i_pll1_data,}, {.compatible = "allwinner,sun6i-a31-pll1-clk", .data = &sun6i_a31_pll1_data,}, {.compatible = "allwinner,sun4i-apb1-clk", .data = &sun4i_apb1_data,}, + {.compatible = "allwinner,sun4i-mod0-clk", .data = &sun4i_mod0_data,}, {} };