linux-kernel - Re: [PATCH v4 2/2] x86: intel-mid: add watchdog platform code for Merrifield

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Date:	Tue, 15 Apr 2014 13:09:00 -0700
From:	David Cohen <david.a.cohen@...ux.intel.com>
To:	wim@...ana.be, tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org
Cc:	linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org,
	gnomes@...rguk.ukuu.org.uk
Subject: Re: [PATCH v4 2/2] x86: intel-mid: add watchdog platform code for
 Merrifield

On Tue, Apr 15, 2014 at 01:06:06PM -0700, David Cohen wrote:
> This patch adds platform code for Intel Merrifield.
> Since the watchdog is not part of SFI table, we have no other option but
> to manually register watchdog's platform device (argh!).
> 
> Signed-off-by: David Cohen <david.a.cohen@...ux.intel.com>
> ---
>  arch/x86/platform/intel-mid/device_libs/Makefile   |  1 +
>  .../platform/intel-mid/device_libs/platform_wdt.c  | 66 ++++++++++++++++++++++
>  2 files changed, 67 insertions(+)
>  create mode 100644 arch/x86/platform/intel-mid/device_libs/platform_wdt.c
> 
> diff --git a/arch/x86/platform/intel-mid/device_libs/Makefile b/arch/x86/platform/intel-mid/device_libs/Makefile
> index 097e7a7940d8..af9307f2cc28 100644
> --- a/arch/x86/platform/intel-mid/device_libs/Makefile
> +++ b/arch/x86/platform/intel-mid/device_libs/Makefile
> @@ -20,3 +20,4 @@ obj-$(subst m,y,$(CONFIG_DRM_MEDFIELD)) += platform_tc35876x.o
>  obj-$(subst m,y,$(CONFIG_SERIAL_MRST_MAX3110)) += platform_max3111.o
>  # MISC Devices
>  obj-$(subst m,y,$(CONFIG_KEYBOARD_GPIO)) += platform_gpio_keys.o
> +obj-$(subst m,y,$(CONFIG_INTEL_MID_WATCHDOG)) += platform_wdt.o
> diff --git a/arch/x86/platform/intel-mid/device_libs/platform_wdt.c b/arch/x86/platform/intel-mid/device_libs/platform_wdt.c
> new file mode 100644
> index 000000000000..4b0434b54aff
> --- /dev/null
> +++ b/arch/x86/platform/intel-mid/device_libs/platform_wdt.c
> @@ -0,0 +1,66 @@
> +/*
> + * platform_wdt.c: Watchdog platform library file
> + *
> + * (C) Copyright 2014 Intel Corporation
> + * Author: David Cohen <david.a.cohen@...ux.intel.com>
> + *
> + * 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; version 2
> + * of the License.
> + */
> +
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/platform_data/intel-mid_wdt.h>
> +#include <asm/intel-mid.h>
> +
> +#define TANGIER_EXT_TIMER0_MSI 15
> +
> +static struct platform_device wdt_dev = {
> +	.name = "intel_mid_wdt",
> +	.id = -1,
> +};
> +
> +static int tangier_probe(struct platform_device *pdev)
> +{
> +	int ioapic;
> +	struct io_apic_irq_attr irq_attr = { 0 };
> +
> +	ioapic = mp_find_ioapic(TANGIER_EXT_TIMER0_MSI);

Forgot remove this hardcoded irq number. I'll send v4.1 of this patch.

BR, David

> +	if (ioapic >= 0) {
> +		int ret;
> +		irq_attr.ioapic = ioapic;
> +		irq_attr.ioapic_pin = TANGIER_EXT_TIMER0_MSI;
> +		irq_attr.trigger = 1;
> +		irq_attr.polarity = 0; /* Active high */
> +		ret = io_apic_set_pci_routing(NULL, TANGIER_EXT_TIMER0_MSI,
> +					      &irq_attr);
> +		if (ret)
> +			return ret;
> +	} else {
> +		dev_warn(&pdev->dev, "cannot find interrupt %d in ioapic\n",
> +			 TANGIER_EXT_TIMER0_MSI);
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static struct intel_mid_wdt_pdata tangier_pdata = {
> +	.irq = TANGIER_EXT_TIMER0_MSI,
> +	.probe = tangier_probe,
> +};
> +
> +static int __init register_mid_wdt(void)
> +{
> +	if (intel_mid_identify_cpu() == INTEL_MID_CPU_CHIP_TANGIER) {
> +		wdt_dev.dev.platform_data = &tangier_pdata;
> +		return platform_device_register(&wdt_dev);
> +	}
> +
> +	return -ENODEV;
> +}
> +
> +rootfs_initcall(register_mid_wdt);
> -- 
> 1.9.1
> 
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