From patchwork Thu Nov 28 12:45:33 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Boris BREZILLON X-Patchwork-Id: 3254061 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 3C2B0C045B for ; Thu, 28 Nov 2013 12:46:34 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id F162120515 for ; Thu, 28 Nov 2013 12:46:32 +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 9A7BA204E2 for ; Thu, 28 Nov 2013 12:46:31 +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 1Vm0zD-0000Kt-4S; Thu, 28 Nov 2013 12:46:27 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Vm0zA-0002Q7-Pa; Thu, 28 Nov 2013 12:46:24 +0000 Received: from 7.mo6.mail-out.ovh.net ([46.105.59.196] helo=mo6.mail-out.ovh.net) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Vm0z7-0002Ox-89 for linux-arm-kernel@lists.infradead.org; Thu, 28 Nov 2013 12:46:22 +0000 Received: from mail610.ha.ovh.net (b9.ovh.net [213.186.33.59]) by mo6.mail-out.ovh.net (Postfix) with SMTP id E2AC4FFA09A for ; Thu, 28 Nov 2013 13:47:24 +0100 (CET) Received: from b0.ovh.net (HELO queueout) (213.186.33.50) by b0.ovh.net with SMTP; 28 Nov 2013 14:46:10 +0200 Received: from unknown (HELO bbrezillon-laptop.private.s2ih) (b.brezillon@overkiz.com@80.245.18.66) by ns0.ovh.net with SMTP; 28 Nov 2013 14:46:08 +0200 From: Boris BREZILLON To: Nicolas Ferre , Russell King , Mike Turquette , Felipe Balbi , Jason Cooper Subject: [PATCH v6 08/16] clk: at91: add PMC system clocks Date: Thu, 28 Nov 2013 13:45:33 +0100 Message-Id: <1385642733-6941-1-git-send-email-b.brezillon@overkiz.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1385642184-6467-1-git-send-email-b.brezillon@overkiz.com> References: <1385642184-6467-1-git-send-email-b.brezillon@overkiz.com> X-Ovh-Tracer-Id: 4250272148901296236 X-Ovh-Remote: 80.245.18.66 () X-Ovh-Local: 213.186.33.20 (ns0.ovh.net) X-OVH-SPAMSTATE: OK X-OVH-SPAMSCORE: -100 X-OVH-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrfeeiledrjeelucetufdoteggodetrfcurfhrohhfihhlvgemucfqggfjnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmd X-Spam-Check: DONE|U 0.5/N X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: -100 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrfeeiledrjeelucetufdoteggodetrfcurfhrohhfihhlvgemucfqggfjnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmd X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20131128_074621_481469_056C13D7 X-CRM114-Status: GOOD ( 23.32 ) X-Spam-Score: -1.9 (-) Cc: devicetree@vger.kernel.org, linux-doc@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Boris BREZILLON , 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=-4.2 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 This patch adds new at91 system clock implementation using common clk framework. Some peripherals need to enable a "system" clock in order to work properly. Each system clock is given an id based on the bit position in SCER/SCDR registers. Signed-off-by: Boris BREZILLON Acked-by: Nicolas Ferre --- drivers/clk/at91/Makefile | 1 + drivers/clk/at91/clk-system.c | 135 +++++++++++++++++++++++++++++++++++++++++ drivers/clk/at91/pmc.c | 5 ++ drivers/clk/at91/pmc.h | 3 + 4 files changed, 144 insertions(+) create mode 100644 drivers/clk/at91/clk-system.c diff --git a/drivers/clk/at91/Makefile b/drivers/clk/at91/Makefile index e28fb2b..c2b7068 100644 --- a/drivers/clk/at91/Makefile +++ b/drivers/clk/at91/Makefile @@ -4,3 +4,4 @@ obj-y += pmc.o obj-y += clk-main.o clk-pll.o clk-plldiv.o clk-master.o +obj-y += clk-system.o diff --git a/drivers/clk/at91/clk-system.c b/drivers/clk/at91/clk-system.c new file mode 100644 index 0000000..8f7c043 --- /dev/null +++ b/drivers/clk/at91/clk-system.c @@ -0,0 +1,135 @@ +/* + * Copyright (C) 2013 Boris BREZILLON + * + * 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 "pmc.h" + +#define SYSTEM_MAX_ID 31 + +#define SYSTEM_MAX_NAME_SZ 32 + +#define to_clk_system(hw) container_of(hw, struct clk_system, hw) +struct clk_system { + struct clk_hw hw; + struct at91_pmc *pmc; + u8 id; +}; + +static int clk_system_enable(struct clk_hw *hw) +{ + struct clk_system *sys = to_clk_system(hw); + struct at91_pmc *pmc = sys->pmc; + + pmc_write(pmc, AT91_PMC_SCER, 1 << sys->id); + return 0; +} + +static void clk_system_disable(struct clk_hw *hw) +{ + struct clk_system *sys = to_clk_system(hw); + struct at91_pmc *pmc = sys->pmc; + + pmc_write(pmc, AT91_PMC_SCDR, 1 << sys->id); +} + +static int clk_system_is_enabled(struct clk_hw *hw) +{ + struct clk_system *sys = to_clk_system(hw); + struct at91_pmc *pmc = sys->pmc; + + return !!(pmc_read(pmc, AT91_PMC_SCSR) & (1 << sys->id)); +} + +static const struct clk_ops system_ops = { + .enable = clk_system_enable, + .disable = clk_system_disable, + .is_enabled = clk_system_is_enabled, +}; + +static struct clk * __init +at91_clk_register_system(struct at91_pmc *pmc, const char *name, + const char *parent_name, u8 id) +{ + struct clk_system *sys; + struct clk *clk = NULL; + struct clk_init_data init; + + if (!parent_name || id > SYSTEM_MAX_ID) + return ERR_PTR(-EINVAL); + + sys = kzalloc(sizeof(*sys), GFP_KERNEL); + if (!sys) + return ERR_PTR(-ENOMEM); + + init.name = name; + init.ops = &system_ops; + init.parent_names = &parent_name; + init.num_parents = 1; + /* + * CLK_IGNORE_UNUSED is used to avoid ddrck switch off. + * TODO : we should implement a driver supporting at91 ddr controller + * (see drivers/memory) which would request and enable the ddrck clock. + * When this is done we will be able to remove CLK_IGNORE_UNUSED flag. + */ + init.flags = CLK_IGNORE_UNUSED; + + sys->id = id; + sys->hw.init = &init; + sys->pmc = pmc; + + clk = clk_register(NULL, &sys->hw); + if (IS_ERR(clk)) + kfree(sys); + + return clk; +} + +static void __init +of_at91_clk_sys_setup(struct device_node *np, struct at91_pmc *pmc) +{ + int num; + u32 id; + struct clk *clk; + const char *name; + struct device_node *sysclknp; + const char *parent_name; + + num = of_get_child_count(np); + if (num > (SYSTEM_MAX_ID + 1)) + return; + + for_each_child_of_node(np, sysclknp) { + if (of_property_read_u32(sysclknp, "reg", &id)) + continue; + + if (of_property_read_string(np, "clock-output-names", &name)) + name = sysclknp->name; + + parent_name = of_clk_get_parent_name(sysclknp, 0); + + clk = at91_clk_register_system(pmc, name, parent_name, id); + if (IS_ERR(clk)) + continue; + + of_clk_add_provider(sysclknp, of_clk_src_simple_get, clk); + } +} + +void __init of_at91rm9200_clk_sys_setup(struct device_node *np, + struct at91_pmc *pmc) +{ + of_at91_clk_sys_setup(np, pmc); +} diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c index a311cf3..a97554f 100644 --- a/drivers/clk/at91/pmc.c +++ b/drivers/clk/at91/pmc.c @@ -264,6 +264,11 @@ static const struct of_device_id pmc_clk_ids[] __initdata = { .compatible = "atmel,at91sam9x5-clk-master", .data = of_at91sam9x5_clk_master_setup, }, + /* System clocks */ + { + .compatible = "atmel,at91rm9200-clk-system", + .data = of_at91rm9200_clk_sys_setup, + }, { /*sentinel*/ } }; diff --git a/drivers/clk/at91/pmc.h b/drivers/clk/at91/pmc.h index be5c964..9c8a397 100644 --- a/drivers/clk/at91/pmc.h +++ b/drivers/clk/at91/pmc.h @@ -77,4 +77,7 @@ extern void __init of_at91rm9200_clk_master_setup(struct device_node *np, extern void __init of_at91sam9x5_clk_master_setup(struct device_node *np, struct at91_pmc *pmc); +extern void __init of_at91rm9200_clk_sys_setup(struct device_node *np, + struct at91_pmc *pmc); + #endif /* __PMC_H_ */