From patchwork Fri Jun 19 08:46:07 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hanjun Guo X-Patchwork-Id: 6643801 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 [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 010B2C0020 for ; Fri, 19 Jun 2015 08:51:08 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 05E7020966 for ; Fri, 19 Jun 2015 08:51:07 +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 EAD6520414 for ; Fri, 19 Jun 2015 08:51:05 +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 1Z5ryT-00083b-Qz; Fri, 19 Jun 2015 08:48:33 +0000 Received: from mail-pa0-f51.google.com ([209.85.220.51]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Z5rx6-0007Ff-9L for linux-arm-kernel@lists.infradead.org; Fri, 19 Jun 2015 08:47:09 +0000 Received: by pacyx8 with SMTP id yx8so81010786pac.2 for ; Fri, 19 Jun 2015 01:46:47 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=ckEuEqZLI19Ld0wgcMbBkYEOsWdsU1xbMOKPCzfGDzM=; b=ggWbuGAKifZ+ZdkfRHbaczONO0XceMqfUnGhdTpIuKrcieY88SUvwl6ARePE5FQePt HDiFQMHSdiLoe2fw5+MPR3aDsa+3CehiC7tJZexpzPGY8oAOjMHSKU12LspBfdypqkC9 skjkSknLr7rCi4tlRDP8GqW2ob/Zdp7GP3H/Tjlvy8pWV0CYYSqQE0C9h68xELOyohzM /lD++s725qWjl+UzivF97yuV+2Jet7IZX6LMsxajUrp8O0HscAyFlUwROReQujv6WX2i Pv+Yu1IeY29QlFWqc7PQI7Lsb3xEGbxMPsONRyE8eMwYBivacJjViVqkK9UUy3TYWQPI Oo1Q== X-Gm-Message-State: ALoCoQmD9d5R7fS2fGrQRW0L1sna1sPU+wRGSSirJ9CpydV2jhS4C4ETl8BNcp5SkEmj8YkJuIls X-Received: by 10.67.24.65 with SMTP id ig1mr29336142pad.61.1434703606971; Fri, 19 Jun 2015 01:46:46 -0700 (PDT) Received: from localhost ([180.150.157.4]) by mx.google.com with ESMTPSA id pr5sm10399857pbc.63.2015.06.19.01.46.45 (version=TLSv1.2 cipher=RC4-SHA bits=128/128); Fri, 19 Jun 2015 01:46:46 -0700 (PDT) From: Hanjun Guo To: Marc Zyngier , Jason Cooper , Will Deacon , Catalin Marinas , "Rafael J. Wysocki" Subject: [PATCH v2 4/9] ACPI / irqchip: Add self-probe infrastructure to initialize IRQ controller Date: Fri, 19 Jun 2015 16:46:07 +0800 Message-Id: <1434703572-26221-5-git-send-email-hanjun.guo@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1434703572-26221-1-git-send-email-hanjun.guo@linaro.org> References: <1434703572-26221-1-git-send-email-hanjun.guo@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150619_014708_397063_50D919D2 X-CRM114-Status: GOOD ( 19.03 ) X-Spam-Score: -0.7 (/) Cc: Wei Huang , Lorenzo Pieralisi , Arnd Bergmann , linux-acpi@vger.kernel.org, linaro-acpi@lists.linaro.org, linux-kernel@vger.kernel.org, Tomasz Nowicki , Olof Johansson , Hanjun Guo , Grant Likely , Thomas Gleixner , Jiang Liu , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 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=-4.5 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 self-probe infrastructure works in the similar way as OF, but there is some different in the mechanism: For DT, the init fn will be called once it finds compatible strings in DT, but for ACPI, we init irqchips by static tables, and in static ACPI tables, there are no compatible strings to indicate irqchips, but thanks to the GIC version presented in ACPI table, we can call the corresponding GIC drivers matching the GIC version with this framework. This mechanism can also be used for clock declare and may also works on x86 for some table parsing too. Part of this patch is based on Tomasz Nowicki's work. Signed-off-by: Tomasz Nowicki Signed-off-by: Hanjun Guo --- drivers/irqchip/irq-gic-acpi.c | 29 +++++++++++++++++++++++++++++ drivers/irqchip/irqchip.h | 12 ++++++++++++ include/asm-generic/vmlinux.lds.h | 13 +++++++++++++ include/linux/acpi.h | 16 ++++++++++++++++ include/linux/mod_devicetable.h | 8 ++++++++ 5 files changed, 78 insertions(+) diff --git a/drivers/irqchip/irq-gic-acpi.c b/drivers/irqchip/irq-gic-acpi.c index 58f7831..f9f1fc7 100644 --- a/drivers/irqchip/irq-gic-acpi.c +++ b/drivers/irqchip/irq-gic-acpi.c @@ -110,3 +110,32 @@ static int __init acpi_gic_version_init(void) return 0; } + +/* + * This special acpi_table_id is the sentinel at the end of the + * acpi_table_id[] array of all irqchips. It is automatically placed at + * the end of the array by the linker, thanks to being part of a + * special section. + */ +static const struct acpi_table_id +irqchip_acpi_match_end __used __section(__irqchip_acpi_table_end); + +extern struct acpi_table_id __irqchip_acpi_table[]; + +void __init acpi_irqchip_init(void) +{ + struct acpi_table_id *id; + + if (acpi_disabled) + return; + + if (acpi_gic_version_init()) + return; + + /* scan the irqchip table to match the GIC version and its driver */ + for (id = __irqchip_acpi_table; id->id[0]; id++) { + if (gic_version == (u8)id->driver_data) + acpi_table_parse(id->id, + (acpi_tbl_table_handler)id->handler); + } +} diff --git a/drivers/irqchip/irqchip.h b/drivers/irqchip/irqchip.h index 0f6486d..241d5f8 100644 --- a/drivers/irqchip/irqchip.h +++ b/drivers/irqchip/irqchip.h @@ -11,6 +11,7 @@ #ifndef _IRQCHIP_H #define _IRQCHIP_H +#include #include /* @@ -25,4 +26,15 @@ */ #define IRQCHIP_DECLARE(name, compat, fn) OF_DECLARE_2(irqchip, name, compat, fn) +/* + * This macro must be used by the different ARM GIC drivers to declare + * the association between their version and their initialization function. + * + * @name: name that must be unique accross all IRQCHIP_ACPI_DECLARE of the + * same file. + * @gic_version: version of GIC + * @fn: initialization function + */ +#define IRQCHIP_ACPI_DECLARE(name, gic_version, fn) \ + ACPI_DECLARE(irqchip, name, ACPI_SIG_MADT, gic_version, fn) #endif diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index 8bd374d..625776c 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -181,6 +181,18 @@ #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) #define EARLYCON_OF_TABLES() OF_TABLE(CONFIG_SERIAL_EARLYCON, earlycon) +#ifdef CONFIG_ACPI +#define ACPI_TABLE(name) \ + . = ALIGN(8); \ + VMLINUX_SYMBOL(__##name##_acpi_table) = .; \ + *(__##name##_acpi_table) \ + *(__##name##_acpi_table_end) + +#define IRQCHIP_ACPI_MATCH_TABLE() ACPI_TABLE(irqchip) +#else +#define IRQCHIP_ACPI_MATCH_TABLE() +#endif + #define KERNEL_DTB() \ STRUCT_ALIGN(); \ VMLINUX_SYMBOL(__dtb_start) = .; \ @@ -516,6 +528,7 @@ CPUIDLE_METHOD_OF_TABLES() \ KERNEL_DTB() \ IRQCHIP_OF_MATCH_TABLE() \ + IRQCHIP_ACPI_MATCH_TABLE() \ EARLYCON_TABLE() \ EARLYCON_OF_TABLES() diff --git a/include/linux/acpi.h b/include/linux/acpi.h index caead48..d383e12 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -825,4 +825,20 @@ static inline struct acpi_device *acpi_get_next_child(struct device *dev, #endif +#ifdef CONFIG_ACPI +#define ACPI_DECLARE(table, name, table_id, data, fn) \ + static const struct acpi_table_id __acpi_table_##name \ + __used __section(__##table##_acpi_table) \ + = { .id = table_id, \ + .handler = (void *)fn, \ + .driver_data = data } +#else +#define ACPI_DECLARE(table, name, table_id, data, fn) \ + static const struct acpi_table_id __acpi_table_##name \ + __attribute__((unused)) \ + = { .id = table_id, \ + .handler = (void *)fn, \ + .driver_data = data } +#endif + #endif /*_LINUX_ACPI_H*/ diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h index 3bfd567..c7fefc7 100644 --- a/include/linux/mod_devicetable.h +++ b/include/linux/mod_devicetable.h @@ -191,6 +191,14 @@ struct acpi_device_id { kernel_ulong_t driver_data; }; +#define ACPI_TABLE_ID_LEN 5 + +struct acpi_table_id { + __u8 id[ACPI_TABLE_ID_LEN]; + const void *handler; + kernel_ulong_t driver_data; +}; + #define PNP_ID_LEN 8 #define PNP_MAX_DEVICES 8