Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753239AbdDDNxq (ORCPT ); Tue, 4 Apr 2017 09:53:46 -0400 Received: from mail-qk0-f195.google.com ([209.85.220.195]:33414 "EHLO mail-qk0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752518AbdDDNxn (ORCPT ); Tue, 4 Apr 2017 09:53:43 -0400 MIME-Version: 1.0 In-Reply-To: References: From: Andy Shevchenko Date: Tue, 4 Apr 2017 16:53:42 +0300 Message-ID: Subject: Re: [PATCH v5 5/6] platform/x86: intel_pmc_ipc: Fix iTCO_wdt GCS memory mapping failure To: Kuppuswamy Sathyanarayanan Cc: Andy Shevchenko , Zha Qipeng , "dvhart@infradead.org" , Guenter Roeck , Wim Van Sebroeck , Sathyanarayanan Kuppuswamy Natarajan , David Box , Rajneesh Bhardwaj , Platform Driver , "linux-kernel@vger.kernel.org" , linux-watchdog@vger.kernel.org Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3577 Lines: 101 On Tue, Apr 4, 2017 at 3:24 AM, Kuppuswamy Sathyanarayanan wrote: > iTCO_wdt driver need access to PMC_CFG GCR register to modify the > noreboot setting. Currently, this is done by passing PMC_CFG reg > address as memory resource to watchdog driver and allowing it directly > modify the PMC_CFG register. But currently PMC driver also has > requirement to memory map the entire GCR register space in this driver. > This causes mem request failure in watchdog driver. So this patch fixes > this issue by adding api to update noreboot flag and passes them api -> API > to watchdog driver via platform data. This one looks good. > diff --git a/drivers/platform/x86/intel_pmc_ipc.c b/drivers/platform/x86/intel_pmc_ipc.c > index 8b7fef0..3d0d6f17 100644 > --- a/drivers/platform/x86/intel_pmc_ipc.c > +++ b/drivers/platform/x86/intel_pmc_ipc.c > @@ -112,6 +112,13 @@ > #define TCO_PMC_OFFSET 0x8 > #define TCO_PMC_SIZE 0x4 > > +/* PMC register bit definitions */ > + > +/* PMC_CFG_REG bit masks */ > +#define PMC_CFG_NO_REBOOT_MASK BIT(4) > +#define PMC_CFG_NO_REBOOT_ENABLE BIT(4) > +#define PMC_CFG_NO_REBOOT_DISABLE 0 > + > static struct intel_pmc_ipc_dev { > struct device *dev; > void __iomem *ipc_base; > @@ -126,7 +133,6 @@ static struct intel_pmc_ipc_dev { > struct platform_device *tco_dev; > > /* gcr */ > - resource_size_t gcr_base; > void __iomem *gcr_mem_base; > int gcr_size; > bool has_gcr_regs; > @@ -312,6 +318,18 @@ int intel_pmc_gcr_update(u32 offset, u32 mask, u32 val) > } > EXPORT_SYMBOL_GPL(intel_pmc_gcr_update); > > +static int update_noreboot_bit(bool status) > +{ > + if (status) > + return intel_pmc_gcr_update(PMC_GCR_PMC_CFG_REG, > + PMC_CFG_NO_REBOOT_MASK, > + PMC_CFG_NO_REBOOT_ENABLE); > + > + return intel_pmc_gcr_update(PMC_GCR_PMC_CFG_REG, > + PMC_CFG_NO_REBOOT_MASK, > + PMC_CFG_NO_REBOOT_DISABLE); > +} > + > static int intel_pmc_ipc_check_status(void) > { > int status; > @@ -629,15 +647,12 @@ static struct resource tco_res[] = { > { > .flags = IORESOURCE_IO, > }, > - /* GCS */ > - { > - .flags = IORESOURCE_MEM, > - }, > }; > > static struct itco_wdt_platform_data tco_info = { > .name = "Apollo Lake SoC", > .version = 5, > + .update_noreboot_flag = update_noreboot_bit, > }; > > #define TELEMETRY_RESOURCE_PUNIT_SSRAM 0 > @@ -694,10 +709,6 @@ static int ipc_create_tco_device(void) > res->start = ipcdev.acpi_io_base + SMI_EN_OFFSET; > res->end = res->start + SMI_EN_SIZE - 1; > > - res = tco_res + TCO_RESOURCE_GCR_MEM; > - res->start = ipcdev.gcr_base + TCO_PMC_OFFSET; > - res->end = res->start + TCO_PMC_SIZE - 1; > - > pdev = platform_device_register_full(&pdevinfo); > if (IS_ERR(pdev)) > return PTR_ERR(pdev); > @@ -859,7 +870,6 @@ static int ipc_plat_get_res(struct platform_device *pdev) > } > ipcdev.ipc_base = addr; > > - ipcdev.gcr_base = res->start + PLAT_RESOURCE_GCR_OFFSET; > ipcdev.gcr_mem_base = addr + PLAT_RESOURCE_GCR_OFFSET; > ipcdev.gcr_size = PLAT_RESOURCE_GCR_SIZE; > dev_info(&pdev->dev, "ipc res: %pR\n", res); -- With Best Regards, Andy Shevchenko