From patchwork Tue Nov 20 19:20:05 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephen Warren X-Patchwork-Id: 1775331 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork1.kernel.org (Postfix) with ESMTP id 759FD3FD1A for ; Tue, 20 Nov 2012 19:22:17 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1TatMq-0000Dm-BC; Tue, 20 Nov 2012 19:20:20 +0000 Received: from avon.wwwdotorg.org ([2001:470:1f0f:bd7::2]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1TatMm-0000DA-Eb for linux-arm-kernel@lists.infradead.org; Tue, 20 Nov 2012 19:20:17 +0000 Received: from severn.wwwdotorg.org (unknown [192.168.65.5]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by avon.wwwdotorg.org (Postfix) with ESMTPS id C83B66254; Tue, 20 Nov 2012 12:21:47 -0700 (MST) Received: from swarren-lx1.nvidia.com (localhost [127.0.0.1]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by severn.wwwdotorg.org (Postfix) with ESMTPSA id 80B76E40FD; Tue, 20 Nov 2012 12:20:13 -0700 (MST) From: Stephen Warren To: Stephen Warren , John Stultz , Thomas Gleixner Subject: [PATCH V3 1/2] clocksource: add common of_clksrc_init() function Date: Tue, 20 Nov 2012 12:20:05 -0700 Message-Id: <1353439206-1654-1-git-send-email-swarren@wwwdotorg.org> X-Mailer: git-send-email 1.7.10.4 X-NVConfidentiality: public X-Virus-Scanned: clamav-milter 0.96.5 at avon.wwwdotorg.org X-Virus-Status: Clean X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20121120_142016_662986_D9DC79E1 X-CRM114-Status: GOOD ( 19.53 ) X-Spam-Score: 0.4 (/) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (0.4 points) pts rule name description ---- ---------------------- -------------------------------------------------- 3.0 KHOP_BIG_TO_CC Sent to 10+ recipients instaed of Bcc or a list -0.0 SPF_PASS SPF: sender matches SPF record -0.7 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: Thomas Petazzoni , Josh Cartwright , Stephen Warren , Arnd Bergmann , linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org, Olof Johansson , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Stephen Warren It is desirable to move all clocksource drivers to drivers/clocksource, yet each requires its own initialization function. We'd rather not pollute with a header for each function. Instead, create a single of_clksrc_init() function which will determine which clocksource driver to initialize based on device tree. Inspired by a similar patch for drivers/irqchip by Thomas Petazzoni. Signed-off-by: Stephen Warren --- v3: Use a linker section to replace manually maintained table. v2: New patch. This series is based on the ARM sys_timer rework that I reposted today. I hope that these patches can be taken through arm-soc tree for 3.9; I will repost them based on 3.8-rc1 at the appropriate time. --- drivers/clocksource/Kconfig | 3 +++ drivers/clocksource/Makefile | 1 + drivers/clocksource/clksrc-of.c | 41 +++++++++++++++++++++++++++++++++++++ include/asm-generic/vmlinux.lds.h | 10 +++++++++ include/linux/clocksource.h | 10 +++++++++ 5 files changed, 65 insertions(+) create mode 100644 drivers/clocksource/clksrc-of.c diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index c9f67de..4f300c5 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -1,3 +1,6 @@ +config CLKSRC_OF + bool + config CLKSRC_I8253 bool diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile index 24fb888..29017a3 100644 --- a/drivers/clocksource/Makefile +++ b/drivers/clocksource/Makefile @@ -1,3 +1,4 @@ +obj-$(CONFIG_CLKSRC_OF) += clksrc-of.o obj-$(CONFIG_ATMEL_TCB_CLKSRC) += tcb_clksrc.o obj-$(CONFIG_X86_CYCLONE_TIMER) += cyclone.o obj-$(CONFIG_X86_PM_TIMER) += acpi_pm.o diff --git a/drivers/clocksource/clksrc-of.c b/drivers/clocksource/clksrc-of.c new file mode 100644 index 0000000..04c7820 --- /dev/null +++ b/drivers/clocksource/clksrc-of.c @@ -0,0 +1,41 @@ +/* + * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. + * + * 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 + +extern struct of_device_id *__start_clksrc_of_match_tables[]; +extern struct of_device_id *__stop_clksrc_of_match_tables[]; + +void __init clocksource_of_init(void) +{ + struct of_device_id **table; + struct of_device_id **stop; + struct device_node *np; + const struct of_device_id *match; + void (*init_func)(void); + + table = __start_clksrc_of_match_tables; + stop = __stop_clksrc_of_match_tables; + + for ( ; table < stop; table++) { + for_each_matching_node(np, *table) { + match = of_match_node(*table, np); + init_func = match->data; + init_func(); + } + } +} diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index d1ea7ce..b17f793 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -149,6 +149,15 @@ #define TRACE_SYSCALLS() #endif +#ifdef CONFIG_CLKSRC_OF +#define CLKSRC_OF_MATCH_TABLES() \ + . = ALIGN(8); \ + VMLINUX_SYMBOL(__start_clksrc_of_match_tables) = .; \ + *(__clksrc_of_table) \ + VMLINUX_SYMBOL(__stop_clksrc_of_match_tables) = .; +#else +#define CLKSRC_OF_MATCH_TABLES() +#endif #define KERNEL_DTB() \ STRUCT_ALIGN(); \ @@ -490,6 +499,7 @@ *(.init.rodata) \ FTRACE_EVENTS() \ TRACE_SYSCALLS() \ + CLKSRC_OF_MATCH_TABLES() \ DEV_DISCARD(init.rodata) \ CPU_DISCARD(init.rodata) \ MEM_DISCARD(init.rodata) \ diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h index 4dceaf8..3b0f30e 100644 --- a/include/linux/clocksource.h +++ b/include/linux/clocksource.h @@ -332,4 +332,14 @@ extern int clocksource_mmio_init(void __iomem *, const char *, extern int clocksource_i8253_init(void); +#ifdef CONFIG_CLKSRC_OF +extern void clocksource_of_init(void); + +#define CLKSRC_OF_MATCH_TABLE(name, table) \ + static const struct of_device_id __used \ + __attribute__((section("__clksrc_of_table"))) \ + *__p_clksrc_of_match_table_##name = table; + +#endif + #endif /* _LINUX_CLOCKSOURCE_H */