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Message-ID: <CAHp75VcDQoVrGkBvwb7wXwUwG_ew+XDGnBmvvraDBJ4Oy0SkOQ@mail.gmail.com>
Date: Sun, 2 Apr 2017 17:04:57 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc: Andy Shevchenko <andy@...radead.org>,
Zha Qipeng <qipeng.zha@...el.com>,
"dvhart@...radead.org" <dvhart@...radead.org>,
Guenter Roeck <linux@...ck-us.net>,
Wim Van Sebroeck <wim@...ana.be>, sathyaosid@...il.com,
David Box <david.e.box@...ux.intel.com>,
Rajneesh Bhardwaj <rajneesh.bhardwaj@...el.com>,
Platform Driver <platform-driver-x86@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
linux-watchdog@...r.kernel.org
Subject: Re: [PATCH v4 3/5] watchdog: iTCO_wdt: Add PMC specific noreboot
update api
On Sat, Apr 1, 2017 at 2:27 AM, Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@...ux.intel.com> wrote:
> In some SOCs, setting noreboot bit needs modification to
SoCs.
Perhaps you can create a wikipage to share with your team what style
issues usually needs to be addressed.
One of them is a proper capitalization in abbreviations / code names.
> PMC GC registers. But not all PMC drivers allow other drivers
> to memory map their GC region. This could create mem request
> conflict in watchdog driver. So this patch adds facility to allow
> PMC drivers to pass noreboot update function to watchdog
> drivers via platform data.
> --- a/drivers/watchdog/iTCO_wdt.c
> +++ b/drivers/watchdog/iTCO_wdt.c
> @@ -100,6 +100,8 @@ struct iTCO_wdt_private {
> */
> struct resource *gcs_pmc_res;
> unsigned long __iomem *gcs_pmc;
> + /* pmc specific api to update noreboot flag */
PMC
API
> + int (*update_noreboot_flag)(bool status);
> /* the lock for io operations */
> spinlock_t io_lock;
> /* the PCI-device */
> @@ -176,9 +178,13 @@ static void iTCO_wdt_set_NO_REBOOT_bit(struct iTCO_wdt_private *p)
>
> /* Set the NO_REBOOT bit: this disables reboots */
> if (p->iTCO_version >= 2) {
> - val32 = readl(p->gcs_pmc);
> - val32 |= no_reboot_bit(p);
> - writel(val32, p->gcs_pmc);
> + if (p->update_noreboot_flag)
> + p->update_noreboot_flag(1);
1 -> true for sake of consistency.
> + else {
> + val32 = readl(p->gcs_pmc);
> + val32 |= no_reboot_bit(p);
> + writel(val32, p->gcs_pmc);
> + }
> } else if (p->iTCO_version == 1) {
> pci_read_config_dword(p->pci_dev, 0xd4, &val32);
> val32 |= no_reboot_bit(p);
> @@ -193,11 +199,14 @@ static int iTCO_wdt_unset_NO_REBOOT_bit(struct iTCO_wdt_private *p)
>
> /* Unset the NO_REBOOT bit: this enables reboots */
> if (p->iTCO_version >= 2) {
> - val32 = readl(p->gcs_pmc);
> - val32 &= ~enable_bit;
> - writel(val32, p->gcs_pmc);
> -
> - val32 = readl(p->gcs_pmc);
> + if (p->update_noreboot_flag)
> + return p->update_noreboot_flag(0);
0 -> false.
> + else {
> + val32 = readl(p->gcs_pmc);
> + val32 &= ~enable_bit;
> + writel(val32, p->gcs_pmc);
> + val32 = readl(p->gcs_pmc);
This and similar above code might be split to a helper and you may
assign it once. In such case you will not need a special flag anymore.
Helpers split might be done as a preparatory separate patch.
--
With Best Regards,
Andy Shevchenko
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