Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1945970AbbEVPiO (ORCPT ); Fri, 22 May 2015 11:38:14 -0400 Received: from mail-pa0-f46.google.com ([209.85.220.46]:33707 "EHLO mail-pa0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1945920AbbEVPiK (ORCPT ); Fri, 22 May 2015 11:38:10 -0400 Message-ID: <555F4D58.6040107@linaro.org> Date: Fri, 22 May 2015 23:38:00 +0800 From: Hanjun Guo User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.3.0 MIME-Version: 1.0 To: fu.wei@linaro.org, Suravee.Suthikulpanit@amd.com, linaro-acpi@lists.linaro.org, linux-watchdog@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org CC: tekkamanninja@gmail.com, graeme.gregory@linaro.org, al.stone@linaro.org, timur@codeaurora.org, ashwin.chaugule@linaro.org, arnd@arndb.de, linux@roeck-us.net, vgandhi@codeaurora.org, wim@iguana.be, jcm@redhat.com, leo.duran@amd.com, corbet@lwn.net, mark.rutland@arm.com, Catalin Marinas , Will Deacon Subject: Re: [PATCH v2 7/7] ACPI: import watchdog info of GTDT into platform device References: <=fu.wei@linaro.org> <1432197156-16947-1-git-send-email-fu.wei@linaro.org> <1432197156-16947-8-git-send-email-fu.wei@linaro.org> In-Reply-To: <1432197156-16947-8-git-send-email-fu.wei@linaro.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4214 Lines: 150 +CC Catalin and Will On 2015年05月21日 16:32, fu.wei@linaro.org wrote: > From: Fu Wei > > Parse SBSA Generic Watchdog Structure in GTDT table of ACPI, > and create a platform device with that information. > This platform device can be used by the ARM SBSA Generic > Watchdog driver. > > Signed-off-by: Fu Wei > --- > arch/arm64/kernel/acpi.c | 136 +++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 136 insertions(+) > > diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c > index 8b83955..1ed11fd 100644 > --- a/arch/arm64/kernel/acpi.c > +++ b/arch/arm64/kernel/acpi.c > @@ -23,6 +23,7 @@ > #include > #include > #include > +#include > #include > > #include > @@ -343,3 +344,138 @@ void __init acpi_gic_init(void) > > early_acpi_os_unmap_memory((char *)table, tbl_size); > } > + > +static int __init acpi_gtdt_import_sbsa_gwdt(struct acpi_gtdt_watchdog *wd, > + int index) > +{ > + struct platform_device *pdev; > + struct resource *res; > + u32 gsi, flags; > + int irq, trigger, polarity; > + resource_size_t rf_base_phy, cf_base_phy; > + int err = -ENOMEM; > + > + /* > + * Get SBSA Generic Watchdog info > + * from a Watchdog GT type structure in GTDT > + */ > + rf_base_phy = (resource_size_t)wd->refresh_frame_address; > + cf_base_phy = (resource_size_t)wd->control_frame_address; > + gsi = wd->timer_interrupt; > + flags = wd->timer_flags; > + > + pr_info("GTDT: a Watchdog GT structure(0x%llx/0x%llx gsi:%u flags:0x%x)\n", > + rf_base_phy, cf_base_phy, gsi, flags); Can we use pr_debug here? I don't think those information worthy a pr_info. > + > + if (!(rf_base_phy && cf_base_phy && gsi)) { > + pr_err("GTDT: failed geting the device info.\n"); > + return -EINVAL; > + } > + > + trigger = (flags & ACPI_GTDT_INTERRUPT_MODE) ? ACPI_EDGE_SENSITIVE > + : ACPI_LEVEL_SENSITIVE; > + polarity = (flags & ACPI_GTDT_INTERRUPT_POLARITY) ? ACPI_ACTIVE_LOW > + : ACPI_ACTIVE_HIGH; I see places to duplicate this, I will look into this to see we can form a function to handle it. > + irq = acpi_register_gsi(NULL, gsi, trigger, polarity); > + if (irq < 0) { > + pr_err("GTDT: failed to register GSI of the Watchdog GT.\n"); > + return -EINVAL; > + } > + > + pdev = platform_device_alloc("sbsa-gwdt", index); Please put a comment before this function to explain why we need a "sbsa-gwdt" name here. > + if (!pdev) > + goto err_unregister_gsi; > + > + res = kcalloc(3, sizeof(*res), GFP_KERNEL); > + if (!res) > + goto err_device_put; > + > + res[0].start = rf_base_phy; > + res[0].end = rf_base_phy + SZ_4K - 1; > + res[0].name = "refresh"; > + res[0].flags = IORESOURCE_MEM; > + > + res[1].start = cf_base_phy; > + res[1].end = cf_base_phy + SZ_4K - 1; So why SZ_4K? is it defined in SBSA spec? if so, please comment on it too. > + res[1].name = "control"; > + res[1].flags = IORESOURCE_MEM; > + > + res[2].start = irq; > + res[2].end = res[2].start; > + res[2].name = "ws0"; > + res[2].flags = IORESOURCE_IRQ; > + > + err = platform_device_add_resources(pdev, res, 3); > + if (err) > + goto err_free_res; > + > + err = platform_device_add(pdev); > + if (err) > + goto err_free_res; > + > + return 0; > + > +err_free_res: > + kfree(res); > +err_device_put: > + platform_device_put(pdev); > +err_unregister_gsi: > + acpi_unregister_gsi(gsi); > + > + return err; > +} > + > +/* Initialize SBSA generic Watchdog platform device info from GTDT */ > +static int __init acpi_gtdt_sbsa_gwdt_init(struct acpi_table_header *table) > +{ > + struct acpi_table_gtdt *gtdt; > + struct acpi_gtdt_header *header; > + void *gtdt_subtable; > + int i, gwdt_index; > + int ret = 0; > + > + if (table->revision < 2) { > + pr_info("GTDT: Revision:%d doesn't support Platform Timers.\n", > + table->revision); pr_warn() would be good. Thanks Hanjun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/