From patchwork Wed Jan 17 18:29:48 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lucas Stach X-Patchwork-Id: 10170405 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 81411603B5 for ; Wed, 17 Jan 2018 18:29:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 77BAC1FF1E for ; Wed, 17 Jan 2018 18:29:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6B7D61FFE4; Wed, 17 Jan 2018 18:29:59 +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=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 77FEE1FFDB for ; Wed, 17 Jan 2018 18:29:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753547AbeAQS35 (ORCPT ); Wed, 17 Jan 2018 13:29:57 -0500 Received: from metis.ext.pengutronix.de ([85.220.165.71]:38197 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752654AbeAQS34 (ORCPT ); Wed, 17 Jan 2018 13:29:56 -0500 Received: from dude.hi.pengutronix.de ([2001:67c:670:100:1d::7] helo=dude.pengutronix.de.) by metis.ext.pengutronix.de with esmtp (Exim 4.89) (envelope-from ) id 1ebsT8-0000q6-Qj; Wed, 17 Jan 2018 19:29:50 +0100 From: Lucas Stach To: Michael Turquette , Stephen Boyd , Rob Herring , Mark Rutland Cc: Shawn Guo , Fabio Estevam , linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kernel@pengutronix.de, patchwork-lst@pengutronix.de Subject: [PATCH 2/4] clk: imx: add SCCG PLL type Date: Wed, 17 Jan 2018 19:29:48 +0100 Message-Id: <20180117182950.26460-2-l.stach@pengutronix.de> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180117182950.26460-1-l.stach@pengutronix.de> References: <20180117182950.26460-1-l.stach@pengutronix.de> X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::7 X-SA-Exim-Mail-From: l.stach@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-clk@vger.kernel.org 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 The SCCG is a new PLL type introduced on i.MX8. Add support for this. The driver currently misses the PLL lock check, as the preliminary documentation mentions lock configurations, but is quiet about where to find the actual lock status signal. Signed-off-by: Lucas Stach --- drivers/clk/imx/Makefile | 3 +- drivers/clk/imx/clk-sccg-pll.c | 235 +++++++++++++++++++++++++++++++++++++++++ drivers/clk/imx/clk.h | 9 ++ 3 files changed, 246 insertions(+), 1 deletion(-) create mode 100644 drivers/clk/imx/clk-sccg-pll.c diff --git a/drivers/clk/imx/Makefile b/drivers/clk/imx/Makefile index 9892ae63539c..bfcbd5272d12 100644 --- a/drivers/clk/imx/Makefile +++ b/drivers/clk/imx/Makefile @@ -12,7 +12,8 @@ obj-y += \ clk-pllv1.o \ clk-pllv2.o \ clk-pllv3.o \ - clk-pfd.o + clk-pfd.o \ + clk-sccg-pll.o obj-$(CONFIG_SOC_IMX1) += clk-imx1.o obj-$(CONFIG_SOC_IMX21) += clk-imx21.o diff --git a/drivers/clk/imx/clk-sccg-pll.c b/drivers/clk/imx/clk-sccg-pll.c new file mode 100644 index 000000000000..3a79f952564b --- /dev/null +++ b/drivers/clk/imx/clk-sccg-pll.c @@ -0,0 +1,235 @@ +/* + * Copyright 2017 NXP. + * + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +#include +#include +#include +#include + +#include "clk.h" + +/* PLL CFGs */ +#define PLL_CFG0 0x0 +#define PLL_CFG1 0x4 +#define PLL_CFG2 0x8 + +#define PLL_DIVF1_SHIFT 13 +#define PLL_DIVF2_SHIFT 7 +#define PLL_DIVF_MASK 0x3f + +#define PLL_DIVR1_SHIFT 25 +#define PLL_DIVR2_SHIFT 19 +#define PLL_DIVR1_MASK 0x3 +#define PLL_DIVR2_MASK 0x3f +#define PLL_REF_SHIFT 0 +#define PLL_REF_MASK 0x3 + +#define PLL_LOCK 31 +#define PLL_PD 7 + +#define OSC_25M 25000000 +#define OSC_27M 27000000 + +struct clk_sccg_pll { + struct clk_hw hw; + void __iomem *base; +}; + +#define to_clk_sccg_pll(_hw) container_of(_hw, struct clk_sccg_pll, hw) + +static int clk_pll1_is_prepared(struct clk_hw *hw) +{ + struct clk_sccg_pll *pll = to_clk_sccg_pll(hw); + u32 val; + + val = readl_relaxed(pll->base + PLL_CFG0); + return (val & (1 << PLL_PD)) ? 0 : 1; +} + +static unsigned long clk_pll1_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct clk_sccg_pll *pll = to_clk_sccg_pll(hw); + u32 val, divf; + + val = readl_relaxed(pll->base + PLL_CFG2); + divf = (val >> PLL_DIVF1_SHIFT) & PLL_DIVF_MASK; + + return parent_rate * 2 * (divf + 1); +} + +static long clk_pll1_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *prate) +{ + unsigned long parent_rate = *prate; + u32 div; + + div = rate / (parent_rate * 2); + + return parent_rate * div * 2; +} + +static int clk_pll1_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct clk_sccg_pll *pll = to_clk_sccg_pll(hw); + u32 val; + u32 divf; + + divf = rate / (parent_rate * 2); + + val = readl_relaxed(pll->base + PLL_CFG2); + val &= ~(PLL_DIVF_MASK << PLL_DIVF1_SHIFT); + val |= (divf - 1) << PLL_DIVF1_SHIFT; + writel_relaxed(val, pll->base + PLL_CFG2); + + /* FIXME: PLL lock check */ + + return 0; +} + +static int clk_pll1_prepare(struct clk_hw *hw) +{ + struct clk_sccg_pll *pll = to_clk_sccg_pll(hw); + u32 val; + + val = readl_relaxed(pll->base); + val &= ~(1 << PLL_PD); + writel_relaxed(val, pll->base); + + /* FIXME: PLL lock check */ + + return 0; +} + +static void clk_pll1_unprepare(struct clk_hw *hw) +{ + struct clk_sccg_pll *pll = to_clk_sccg_pll(hw); + u32 val; + + val = readl_relaxed(pll->base); + val |= (1 << PLL_PD); + writel_relaxed(val, pll->base); +} + +static unsigned long clk_pll2_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct clk_sccg_pll *pll = to_clk_sccg_pll(hw); + u32 val, ref, divr1, divf1, divr2, divf2; + u64 temp64; + + val = readl_relaxed(pll->base + PLL_CFG0); + switch ((val >> PLL_REF_SHIFT) & PLL_REF_MASK) { + case 0: + ref = OSC_25M; + break; + case 1: + ref = OSC_27M; + break; + default: + ref = OSC_25M; + break; + } + + val = readl_relaxed(pll->base + PLL_CFG2); + divr1 = (val >> PLL_DIVR1_SHIFT) & PLL_DIVR1_MASK; + divr2 = (val >> PLL_DIVR2_SHIFT) & PLL_DIVR2_MASK; + divf1 = (val >> PLL_DIVF1_SHIFT) & PLL_DIVF_MASK; + divf2 = (val >> PLL_DIVF2_SHIFT) & PLL_DIVF_MASK; + + temp64 = ref * 2; + temp64 *= (divf1 + 1) * (divf2 + 1); + + do_div(temp64, (divr1 + 1) * (divr2 + 1)); + + return (unsigned long)temp64; +} + +static long clk_pll2_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *prate) +{ + u32 div; + unsigned long parent_rate = *prate; + + div = rate / (parent_rate); + + return parent_rate * div; +} + +static int clk_pll2_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + u32 val; + u32 divf; + struct clk_sccg_pll *pll = to_clk_sccg_pll(hw); + + divf = rate / (parent_rate); + + val = readl_relaxed(pll->base + PLL_CFG2); + val &= ~(PLL_DIVF_MASK << PLL_DIVF2_SHIFT); + val |= (divf - 1) << PLL_DIVF2_SHIFT; + writel_relaxed(val, pll->base + PLL_CFG2); + + /* FIXME: PLL lock check */ + + return 0; +} + +static const struct clk_ops clk_sccg_pll1_ops = { + .is_prepared = clk_pll1_is_prepared, + .recalc_rate = clk_pll1_recalc_rate, + .round_rate = clk_pll1_round_rate, + .set_rate = clk_pll1_set_rate, +}; + +static const struct clk_ops clk_sccg_pll2_ops = { + .prepare = clk_pll1_prepare, + .unprepare = clk_pll1_unprepare, + .recalc_rate = clk_pll2_recalc_rate, + .round_rate = clk_pll2_round_rate, + .set_rate = clk_pll2_set_rate, +}; + +struct clk *imx_clk_sccg_pll(const char *name, const char *parent_name, + void __iomem *base, enum imx_sccg_pll_type pll_type) +{ + struct clk_sccg_pll *pll; + struct clk *clk; + struct clk_init_data init; + + pll = kzalloc(sizeof(*pll), GFP_KERNEL); + if (!pll) + return ERR_PTR(-ENOMEM); + + pll->base = base; + init.name = name; + switch (pll_type) { + case SCCG_PLL1: + init.ops = &clk_sccg_pll1_ops; + break; + case SCCG_PLL2: + init.ops = &clk_sccg_pll2_ops; + break; + } + + init.flags = 0; + init.parent_names = &parent_name; + init.num_parents = 1; + + pll->hw.init = &init; + + clk = clk_register(NULL, &pll->hw); + if (IS_ERR(clk)) + kfree(pll); + + return clk; +} diff --git a/drivers/clk/imx/clk.h b/drivers/clk/imx/clk.h index 287610902ea8..809509758e24 100644 --- a/drivers/clk/imx/clk.h +++ b/drivers/clk/imx/clk.h @@ -21,6 +21,11 @@ enum imx_pllv1_type { IMX_PLLV1_IMX35, }; +enum imx_sccg_pll_type { + SCCG_PLL1, + SCCG_PLL2, +}; + struct clk *imx_clk_pllv1(enum imx_pllv1_type type, const char *name, const char *parent, void __iomem *base); @@ -30,6 +35,10 @@ struct clk *imx_clk_pllv2(const char *name, const char *parent, struct clk *imx_clk_frac_pll(const char *name, const char *parent_name, void __iomem *base); +struct clk *imx_clk_sccg_pll(const char *name, const char *parent_name, + void __iomem *base, + enum imx_sccg_pll_type pll_type); + enum imx_pllv3_type { IMX_PLLV3_GENERIC, IMX_PLLV3_SYS,