From patchwork Thu Aug 29 19:14:20 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Santosh Shilimkar X-Patchwork-Id: 2851573 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 1209E9F2F4 for ; Thu, 29 Aug 2013 19:15:48 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id DCF7220439 for ; Thu, 29 Aug 2013 19:15:46 +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 5AC35201BA for ; Thu, 29 Aug 2013 19:15:45 +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 1VF7gj-0006cH-C4; Thu, 29 Aug 2013 19:15:25 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1VF7gZ-0005ju-T9; Thu, 29 Aug 2013 19:15:15 +0000 Received: from comal.ext.ti.com ([198.47.26.152]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VF7gX-0005iU-7d for linux-arm-kernel@lists.infradead.org; Thu, 29 Aug 2013 19:15:14 +0000 Received: from dlelxv90.itg.ti.com ([172.17.2.17]) by comal.ext.ti.com (8.13.7/8.13.7) with ESMTP id r7TJEmVh019424; Thu, 29 Aug 2013 14:14:48 -0500 Received: from DFLE72.ent.ti.com (dfle72.ent.ti.com [128.247.5.109]) by dlelxv90.itg.ti.com (8.14.3/8.13.8) with ESMTP id r7TJEmiC008202; Thu, 29 Aug 2013 14:14:48 -0500 Received: from dflp33.itg.ti.com (10.64.6.16) by DFLE72.ent.ti.com (128.247.5.109) with Microsoft SMTP Server id 14.2.342.3; Thu, 29 Aug 2013 14:14:47 -0500 Received: from ula0393909.am.dhcp.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by dflp33.itg.ti.com (8.14.3/8.13.8) with ESMTP id r7TJEPsI025499; Thu, 29 Aug 2013 14:14:47 -0500 From: Santosh Shilimkar To: Subject: [PATCH 1/3 v2] clk: keystone: add Keystone PLL clock driver Date: Thu, 29 Aug 2013 15:14:20 -0400 Message-ID: <1377803662-3509-2-git-send-email-santosh.shilimkar@ti.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1377803662-3509-1-git-send-email-santosh.shilimkar@ti.com> References: <1377803662-3509-1-git-send-email-santosh.shilimkar@ti.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130829_151513_451326_D73BEBC7 X-CRM114-Status: GOOD ( 19.56 ) X-Spam-Score: -9.4 (---------) Cc: Mark Rutland , devicetree@vger.kernel.org, Santosh Shilimkar , Mike Turquette 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=-6.7 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, 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 Add the driver for the PLL IPs found on Keystone 2 devices. The PLL IP typically has a multiplier, a divider and a post-divider. The PLL IPs like ARMPLL, DDRPLL and PAPLL are controlled by the memory mapped register where as the Main PLL is controlled by a PLL controller and memory map registers. Cc: Mike Turquette Cc: Mark Rutland Signed-off-by: Santosh Shilimkar --- .../devicetree/bindings/clock/keystone-pll.txt | 40 ++++ drivers/clk/keystone/pll.c | 215 ++++++++++++++++++++ 2 files changed, 255 insertions(+) create mode 100644 Documentation/devicetree/bindings/clock/keystone-pll.txt create mode 100644 drivers/clk/keystone/pll.c diff --git a/Documentation/devicetree/bindings/clock/keystone-pll.txt b/Documentation/devicetree/bindings/clock/keystone-pll.txt new file mode 100644 index 0000000..59b16ab --- /dev/null +++ b/Documentation/devicetree/bindings/clock/keystone-pll.txt @@ -0,0 +1,40 @@ +Status: Unstable - ABI compatibility may be broken in the future + +Binding for keystone PLLs. The main PLL IP typically has a multiplier, +a divider and a post divider. The additional PLL IPs like ARMPLL, DDRPLL +and PAPLL are controlled by the memory mapped register where as the Main +PLL is controlled by a PLL controller registers along with memory mapped +registers. + +This binding uses the common clock binding[1]. + +[1] Documentation/devicetree/bindings/clock/clock-bindings.txt + +Required properties: +- #clock-cells : from common clock binding; shall be set to 0. +- compatible : shall be "ti,keystone,main-pll-clock" or "ti,keystone,pll-clock" +- clocks : parent clock phandle +- reg - pll control0 and pll multipler registers +- reg-names : control and multiplier. The multiplier is applicable only for + main pll clock +- fixed-postdiv : fixed post divider value + +Example: + mainpllclk: mainpllclk@2310110 { + #clock-cells = <0>; + compatible = "ti,keystone,main-pll-clock"; + clocks = <&refclkmain>; + reg = <0x02620350 4>, <0x02310110 4>; + reg-names = "control", "multiplier"; + fixed-postdiv = <2>; + }; + + papllclk: papllclk@2620358 { + #clock-cells = <0>; + compatible = "ti,keystone,pll-clock"; + clocks = <&refclkmain>; + clock-output-names = "pa-pll-clk"; + reg = <0x02620358 4>; + reg-names = "control"; + fixed-postdiv = <6>; + }; diff --git a/drivers/clk/keystone/pll.c b/drivers/clk/keystone/pll.c new file mode 100644 index 0000000..5bc0d02 --- /dev/null +++ b/drivers/clk/keystone/pll.c @@ -0,0 +1,215 @@ +/* + * PLL clock driver for Keystone devices + * + * Copyright (C) 2013 Texas Instruments Inc. + * Murali Karicheri + * Santosh Shilimkar + * + * 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 +#include +#include +#include + +#define PLLM_LOW_MASK 0x3f +#define PLLM_HIGH_MASK 0x7ffc0 +#define MAIN_PLLM_HIGH_MASK 0x7f000 +#define PLLM_HIGH_SHIFT 6 +#define PLLD_MASK 0x3f + +/** + * struct clk_pll_data - pll data structure + * @has_pllctrl: If set to non zero, lower 6 bits of multiplier is in pllm + * register of pll controller, else it is in the pll_ctrl0((bit 11-6) + * @phy_pllm: Physical address of PLLM in pll controller. Used when + * has_pllctrl is non zero. + * @phy_pll_ctl0: Physical address of PLL ctrl0. This could be that of + * Main PLL or any other PLLs in the device such as ARM PLL, DDR PLL + * or PA PLL available on keystone2. These PLLs are controlled by + * this register. Main PLL is controlled by a PLL controller. + * @pllm: PLL register map address + * @pll_ctl0: PLL controller map address + * @pllm_lower_mask: multiplier lower mask + * @pllm_upper_mask: multiplier upper mask + * @pllm_upper_shift: multiplier upper shift + * @plld_mask: divider mask + * @postdiv: Post divider + */ +struct clk_pll_data { + bool has_pllctrl; + u32 phy_pllm; + u32 phy_pll_ctl0; + void __iomem *pllm; + void __iomem *pll_ctl0; + u32 pllm_lower_mask; + u32 pllm_upper_mask; + u32 pllm_upper_shift; + u32 plld_mask; + u32 postdiv; +}; + +/** + * struct clk_pll - Main pll clock + * @hw: clk_hw for the pll + * @pll_data: PLL driver specific data + */ +struct clk_pll { + struct clk_hw hw; + struct clk_pll_data *pll_data; +}; + +#define to_clk_pll(_hw) container_of(_hw, struct clk_pll, hw) + +static unsigned long clk_pllclk_recalc(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct clk_pll *pll = to_clk_pll(hw); + struct clk_pll_data *pll_data = pll->pll_data; + unsigned long rate = parent_rate; + u32 mult = 0, prediv, postdiv, val; + + /* + * get bits 0-5 of multiplier from pllctrl PLLM register + * if has_pllctrl is non zero + */ + if (pll_data->has_pllctrl) { + val = readl(pll_data->pllm); + mult = (val & pll_data->pllm_lower_mask); + } + + /* bit6-12 of PLLM is in Main PLL control register */ + val = readl(pll_data->pll_ctl0); + mult |= ((val & pll_data->pllm_upper_mask) + >> pll_data->pllm_upper_shift); + prediv = (val & pll_data->plld_mask); + postdiv = pll_data->postdiv; + + rate /= (prediv + 1); + rate = (rate * (mult + 1)); + rate /= postdiv; + + return rate; +} + +static const struct clk_ops clk_pll_ops = { + .recalc_rate = clk_pllclk_recalc, +}; + +static struct clk *clk_register_pll(struct device *dev, + const char *name, + const char *parent_name, + struct clk_pll_data *pll_data) +{ + struct clk_init_data init; + struct clk_pll *pll; + struct clk *clk; + + pll = kzalloc(sizeof(*pll), GFP_KERNEL); + if (!pll) + return ERR_PTR(-ENOMEM); + + init.name = name; + init.ops = &clk_pll_ops; + init.flags = 0; + init.parent_names = (parent_name ? &parent_name : NULL); + init.num_parents = (parent_name ? 1 : 0); + + pll->pll_data = pll_data; + pll->hw.init = &init; + + clk = clk_register(NULL, &pll->hw); + if (IS_ERR(clk)) + goto out; + + return clk; +out: + kfree(pll); + return NULL; +} + +/** + * _of_clk_init - PLL initialisation via DT + * @node: device tree node for this clock + * @pllctrl: If true, lower 6 bits of multiplier is in pllm register of + * pll controller, else it is in the control regsiter0(bit 11-6) + */ +static void __init _of_pll_clk_init(struct device_node *node, bool pllctrl) +{ + struct clk_pll_data *pll_data; + const char *parent_name; + struct clk *clk; + int i; + + pll_data = kzalloc(sizeof(*pll_data), GFP_KERNEL); + if (!pll_data) { + pr_err("%s: Out of memory\n", __func__); + return; + } + + parent_name = of_clk_get_parent_name(node, 0); + if (of_property_read_u32(node, "fixed-postdiv", &pll_data->postdiv)) + goto out; + + i = of_property_match_string(node, "reg-names", "control"); + pll_data->pll_ctl0 = of_iomap(node, i); + if (!pll_data->pll_ctl0) { + pr_err("%s: ioremap failed\n", __func__); + goto out; + } + + pll_data->pllm_lower_mask = PLLM_LOW_MASK; + pll_data->pllm_upper_shift = PLLM_HIGH_SHIFT; + pll_data->plld_mask = PLLD_MASK; + pll_data->has_pllctrl = pllctrl; + if (!pll_data->has_pllctrl) { + pll_data->pllm_upper_mask = PLLM_HIGH_MASK; + } else { + pll_data->pllm_upper_mask = MAIN_PLLM_HIGH_MASK; + i = of_property_match_string(node, "reg-names", "multiplier"); + pll_data->pllm = of_iomap(node, i); + if (!pll_data->pllm) { + iounmap(pll_data->pll_ctl0); + goto out; + } + } + + clk = clk_register_pll(NULL, node->name, parent_name, pll_data); + if (clk) { + of_clk_add_provider(node, of_clk_src_simple_get, clk); + return; + } + +out: + pr_err("%s: error initializing pll %s\n", __func__, node->name); + kfree(pll_data); +} + +/** + * of_keystone_pll_clk_init - PLL initialisation DT wrapper + * @node: device tree node for this clock + */ +static void __init of_keystone_pll_clk_init(struct device_node *node) +{ + _of_pll_clk_init(node, false); +} +CLK_OF_DECLARE(keystone_pll_clock, "ti,keystone,pll-clock", + of_keystone_pll_clk_init); + +/** + * of_keystone_pll_main_clk_init - Main PLL initialisation DT wrapper + * @node: device tree node for this clock + */ +static void __init of_keystone_main_pll_clk_init(struct device_node *node) +{ + _of_pll_clk_init(node, true); +} +CLK_OF_DECLARE(keystone_main_pll_clock, "ti,keystone,main-pll-clock", + of_keystone_main_pll_clk_init);