From patchwork Thu May 8 20:16:52 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sebastian Hesselbarth X-Patchwork-Id: 4138651 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 6F5C6BFF02 for ; Thu, 8 May 2014 20:19:41 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 8212520212 for ; Thu, 8 May 2014 20:19:40 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8C3E0201FA for ; Thu, 8 May 2014 20:19:39 +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 1WiUl5-0008EK-3b; Thu, 08 May 2014 20:17:35 +0000 Received: from mail-ee0-x22a.google.com ([2a00:1450:4013:c00::22a]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WiUkv-00084s-UE for linux-arm-kernel@lists.infradead.org; Thu, 08 May 2014 20:17:27 +0000 Received: by mail-ee0-f42.google.com with SMTP id d49so2017649eek.15 for ; Thu, 08 May 2014 13:17:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=H3+Q+mwtZiY2GNYm0JdAQ4tR8b8dvPaW9GoYzkWrTYg=; b=pWcbsfRSyPfrOW7g5IGbRd52nsr8+4IWEp53s2cKReX+feEh7xHjW7bEGnYwCj8Vro McPtSWPPEAZtHi2og0MT3KD93tiobYAnVDYMGMhvo66ZNhBnOs5LQjq5VBb0+eaCJts7 VNS5R7KVsz5qKYRCfp96SSyoe3LoULxfmkNuED1jY+YAw3HZvGNLF5cvWvpv39fYLIN9 rv0J21fI3BtnThOn6QdIz20e5Kx3QZQi3RT4IkjKhV34C7l0ZUouSahXtAOMJVLkoDfw Yzqst/OPVh9ImmoaHxmhPRHImX11Oqg2FFNMdudguYU5cMY1IktOnNm6eVejfLYJLCNZ BY+Q== X-Received: by 10.14.102.6 with SMTP id c6mr8146771eeg.96.1399580222877; Thu, 08 May 2014 13:17:02 -0700 (PDT) Received: from topkick.lan (dslc-082-083-251-183.pools.arcor-ip.net. [82.83.251.183]) by mx.google.com with ESMTPSA id z7sm6448128eeo.42.2014.05.08.13.17.00 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 08 May 2014 13:17:01 -0700 (PDT) From: Sebastian Hesselbarth To: Sebastian Hesselbarth Subject: [PATCH RFC 3/3] clk: berlin: add driver for BG2x simple PLLs Date: Thu, 8 May 2014 22:16:52 +0200 Message-Id: <1399580212-30183-4-git-send-email-sebastian.hesselbarth@gmail.com> In-Reply-To: <1399580212-30183-1-git-send-email-sebastian.hesselbarth@gmail.com> References: <1399580212-30183-1-git-send-email-sebastian.hesselbarth@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140508_131726_136393_1728AC25 X-CRM114-Status: GOOD ( 16.50 ) X-Spam-Score: -0.1 (/) Cc: Thomas Petazzoni , Andrew Lunn , Mike Turquette , Jason Cooper , devicetree@vger.kernel.org, Antoine Tenart , linux-kernel@vger.kernel.org, Alexandre Belloni , Gregory Clement , 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: , 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=-2.4 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, 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 is a clock driver for the simple PLLs found on Berlin SoCs. With repect to PLL registers and features, BG2/BG2CD and BG2Q are slightly different, e.g. different allowed VCO dividers and bit shifts. Signed-off-by: Sebastian Hesselbarth --- Cc: Mike Turquette Cc: Alexandre Belloni Cc: Antoine Tenart Cc: Jason Cooper Cc: Andrew Lunn Cc: Gregory Clement Cc: Thomas Petazzoni Cc: devicetree@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org --- drivers/clk/berlin/berlin2-pll.c | 104 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 104 insertions(+) create mode 100644 drivers/clk/berlin/berlin2-pll.c diff --git a/drivers/clk/berlin/berlin2-pll.c b/drivers/clk/berlin/berlin2-pll.c new file mode 100644 index 000000000000..aef4ddd8db10 --- /dev/null +++ b/drivers/clk/berlin/berlin2-pll.c @@ -0,0 +1,104 @@ +/* + * Copyright (c) 2014 Marvell Technology Group Ltd. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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, see . + */ +#include +#include +#include +#include +#include + +#include "common.h" + +struct berlin2_pll { + struct clk_hw hw; + void __iomem *base; + struct berlin2_pll_map map; +}; + +#define to_berlin2_pll(hw) container_of(hw, struct berlin2_pll, hw) + +#define SPLL_CTRL0 0x00 +#define SPLL_CTRL1 0x04 +#define SPLL_CTRL2 0x08 +#define SPLL_CTRL3 0x0c +#define SPLL_CTRL4 0x10 + +#define FBDIV_MASK 0x1ff +#define RFDIV_MASK 0x1f +#define DIVSEL_MASK 0xf + +/* + * The output frequency formula for the pll is: + * clkout = fbdiv / refdiv * parent / vcodiv + */ +static unsigned long +berlin2_pll_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) +{ + struct berlin2_pll *pll = to_berlin2_pll(hw); + struct berlin2_pll_map *map = &pll->map; + u32 val, fbdiv, rfdiv, vcodivsel, vcodiv; + u64 rate = parent_rate; + + val = readl_relaxed(pll->base + SPLL_CTRL0); + fbdiv = (val >> map->fbdiv_shift) & FBDIV_MASK; + rfdiv = (val >> map->rfdiv_shift) & RFDIV_MASK; + if (rfdiv == 0) { + pr_warn("%s has zero rfdiv\n", __clk_get_name(hw->clk)); + rfdiv = 1; + } + + val = readl_relaxed(pll->base + SPLL_CTRL1); + vcodivsel = (val >> map->divsel_shift) & DIVSEL_MASK; + vcodiv = map->vcodiv[vcodivsel]; + if (vcodiv == 0) { + pr_warn("%s has zero vcodiv (index %d)\n", + __clk_get_name(hw->clk), vcodivsel); + vcodiv = 1; + } + + rate *= fbdiv * map->mult; + do_div(rate, rfdiv * vcodiv); + + return (unsigned long)rate; +} + +static const struct clk_ops berlin2_pll_ops = { + .recalc_rate = berlin2_pll_recalc_rate, +}; + +struct clk * __init +berlin2_pll_register(const struct berlin2_pll_map *map, + void __iomem *base, const char *name, + const char *parent_name, unsigned long flags) +{ + struct clk_init_data init; + struct berlin2_pll *pll; + + pll = kzalloc(sizeof(*pll), GFP_KERNEL); + if (!pll) + return ERR_PTR(-ENOMEM); + + /* copy pll_map to allow __initconst */ + memcpy(&pll->map, map, sizeof(*map)); + pll->base = base; + pll->hw.init = &init; + init.name = name; + init.ops = &berlin2_pll_ops; + init.parent_names = &parent_name; + init.num_parents = 1; + init.flags = flags; + + return clk_register(NULL, &pll->hw); +}