From: Henning Schild <henning.schild@siemens.com>
To: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Hans de Goede <hdegoede@redhat.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux LED Subsystem <linux-leds@vger.kernel.org>,
Platform Driver <platform-driver-x86@vger.kernel.org>,
linux-watchdog@vger.kernel.org,
Srikanth Krishnakar <skrishnakar@gmail.com>,
Jan Kiszka <jan.kiszka@siemens.com>,
Gerd Haeussler <gerd.haeussler.ext@siemens.com>,
Guenter Roeck <linux@roeck-us.net>,
Wim Van Sebroeck <wim@linux-watchdog.org>,
Mark Gross <mgross@linux.intel.com>, Pavel Machek <pavel@ucw.cz>
Subject: Re: [PATCH 1/4] platform/x86: simatic-ipc: add main driver for Siemens devices
Date: Fri, 5 Mar 2021 17:42:23 +0100 [thread overview]
Message-ID: <20210305174223.11537d42@md1za8fc.ad001.siemens.net> (raw)
In-Reply-To: <CAHp75VfB8v1n3Hav_oMqG0k4C31NBEUe082i8NrrOGUbSgoESw@mail.gmail.com>
Am Fri, 5 Mar 2021 17:42:42 +0200
schrieb Andy Shevchenko <andy.shevchenko@gmail.com>:
> On Thu, Mar 4, 2021 at 3:47 PM Hans de Goede <hdegoede@redhat.com>
> wrote:
> > On 3/4/21 11:11 AM, Andy Shevchenko wrote:
> > > On Thu, Mar 4, 2021 at 8:36 AM Henning Schild
> > > <henning.schild@siemens.com> wrote:
>
> ...
>
> > >> +u32 simatic_ipc_get_membase0(unsigned int p2sb)
> > >> +{
> > >> + u32 bar0 = 0;
> > >
> > >> +#ifdef CONFIG_PCI
> > >
> > > It's ugly besides the fact that you have a dependency.
> > >
> > >> + struct pci_bus *bus;
> > >
> > > Missed blank line.
> > >
> > >> + /*
> > >> + * The GPIO memory is bar0 of the hidden P2SB device.
> > >> Unhide the device
> > >> + * to have a quick look at it, before we hide it again.
> > >> + * Also grab the pci rescan lock so that device does not
> > >> get discovered
> > >> + * and remapped while it is visible.
> > >> + * This code is inspired by drivers/mfd/lpc_ich.c
> > >> + */
> > >> + bus = pci_find_bus(0, 0);
> > >> + pci_lock_rescan_remove();
> > >> + pci_bus_write_config_byte(bus, p2sb, 0xE1, 0x0);
> > >> + pci_bus_read_config_dword(bus, p2sb, PCI_BASE_ADDRESS_0,
> > >> &bar0); +
> > >> + bar0 &= ~0xf;
> > >> + pci_bus_write_config_byte(bus, p2sb, 0xE1, 0x1);
> > >> + pci_unlock_rescan_remove();
> > >> +#endif /* CONFIG_PCI */
> > >> + return bar0;
> > >> +}
> > >> +EXPORT_SYMBOL(simatic_ipc_get_membase0);
> > >
> > > Oy vey! I know what this is and let's do it differently. I have
> > > some (relatively old) patch series I can send you privately for
> > > testing.
> >
> > This bit stood out the most to me too, it would be good if we can
> > this fixed in some cleaner work. So I'm curious how things will
> > look with Andy's work integrated.
> >
> > Also I don't think this should be exported. Instead this (or its
> > replacement) should be used to get the address for an IOMEM
> > resource to add the platform devices when they are instantiated.
> > Then the platform-dev drivers can just use the regular functions to
> > get their resources instead of relying on this module.
>
> I have published a WIP branch [1]. I have no means to test (I don't
> know what hardware at hand I can use right now), but I made it compile
> after 4 years of gathering dust...
> Feel free to give any kind of comments or share your ideas on how it
> can be improved (the above idea on IOMEM resource is interesting, but
> devices are PCI, not sure how this can be done).
>
> [1]: https://gitlab.com/andy-shev/next/-/tree/p2sb
That is a little weird, might be a good idea to RFC reply to the cover
letter of this one. To allow review and discussion in a central place.
Henning
next prev parent reply other threads:[~2021-03-05 16:48 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-02 16:33 [PATCH 0/4] add device drivers for Siemens Industrial PCs Henning Schild
2021-03-02 16:33 ` [PATCH 1/4] platform/x86: simatic-ipc: add main driver for Siemens devices Henning Schild
2021-03-04 10:11 ` Andy Shevchenko
2021-03-04 13:47 ` Hans de Goede
2021-03-05 15:42 ` Andy Shevchenko
2021-03-05 16:14 ` Hans de Goede
2021-03-05 16:25 ` Andy Shevchenko
2021-03-05 16:36 ` Hans de Goede
2021-03-05 16:41 ` Andy Shevchenko
2021-03-05 16:47 ` Andy Shevchenko
2021-03-05 16:42 ` Henning Schild [this message]
2021-03-05 17:17 ` Andy Shevchenko
2021-03-05 17:44 ` Andy Shevchenko
2021-03-08 12:57 ` Henning Schild
2021-03-08 13:43 ` Andy Shevchenko
2021-03-04 19:42 ` Henning Schild
2021-03-05 15:46 ` Andy Shevchenko
2021-03-05 16:31 ` Henning Schild
2021-03-04 14:03 ` Hans de Goede
2021-03-02 16:33 ` [PATCH 2/4] leds: simatic-ipc-leds: add new driver for Siemens Industial PCs Henning Schild
2021-03-02 20:54 ` Pavel Machek
2021-03-03 13:11 ` Henning Schild
2021-03-03 19:31 ` Pavel Machek
2021-03-03 20:48 ` Henning Schild
2021-03-03 20:56 ` Henning Schild
2021-03-05 18:25 ` Henning Schild
2021-03-06 12:54 ` Henning Schild
2021-03-06 13:06 ` Henning Schild
2021-03-15 11:49 ` Pavel Machek
2021-03-15 11:41 ` Pavel Machek
2021-03-03 17:37 ` Henning Schild
2021-03-03 17:40 ` Pavel Machek
2021-03-03 18:49 ` Henning Schild
2021-03-03 19:27 ` Pavel Machek
2021-03-02 16:33 ` [PATCH 3/4] watchdog: simatic-ipc-wdt: add new driver for Siemens Industrial PCs Henning Schild
2021-03-02 18:38 ` Guenter Roeck
2021-03-03 14:21 ` Henning Schild
2021-03-03 14:49 ` Jan Kiszka
2021-03-08 15:20 ` Henning Schild
[not found] ` <CAHp75VdUXWDg-2o8fmeo7EoMtRLfCnFOw5ptwjXTv9fKMmHv2A@mail.gmail.com>
2021-03-04 9:00 ` Henning Schild
2021-03-02 16:33 ` [PATCH 4/4] platform/x86: pmc_atom: improve critclk_systems matching for Siemens PCs Henning Schild
2021-03-04 9:50 ` Andy Shevchenko
2021-03-04 10:19 ` [PATCH 0/4] add device drivers for Siemens Industrial PCs Andy Shevchenko
2021-03-04 10:20 ` Andy Shevchenko
2021-03-04 19:26 ` Henning Schild
2021-03-04 19:14 ` Henning Schild
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