/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *  Routines for control of MPU-401 in UART mode
 *
 *   Modified for the Aureal Vortex based Soundcards
 *   by Manuel Jander (mjande@embedded.cl).
 *
 *   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; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/time.h>
#include <linux/init.h>
#include <sound/core.h>
#include <sound/mpu401.h>
#include "au88x0.h"

/* Check for mpu401 mmio support. */
/* MPU401 legacy support is only provided as a emergency fallback *
 * for older versions of ALSA. Its usage is strongly discouraged. */
#ifndef MPU401_HW_AUREAL
#define VORTEX_MPU401_LEGACY
#endif

/* Vortex MPU401 defines. */
#define MIDI_CLOCK_DIV      0x61
/* Standart MPU401 defines. */
#define MPU401_RESET		0xff
#define MPU401_ENTER_UART	0x3f
#define MPU401_ACK		    0xfe

static int snd_vortex_midi(vortex_t *vortex)
{
	struct snd_rawmidi *rmidi;
	int temp, mode;
	struct snd_mpu401 *mpu;
	unsigned long port;

#ifdef VORTEX_MPU401_LEGACY
	/* EnableHardCodedMPU401Port() */
	/* Enable Legacy MIDI Interface port. */
	port = (0x03 << 5);	/* FIXME: static address. 0x330 */
	temp =
	    (hwread(vortex->mmio, VORTEX_CTRL) & ~CTRL_MIDI_PORT) |
	    CTRL_MIDI_EN | port;
	hwwrite(vortex->mmio, VORTEX_CTRL, temp);
#else
	/* Disable Legacy MIDI Interface port. */
	temp =
	    (hwread(vortex->mmio, VORTEX_CTRL) & ~CTRL_MIDI_PORT) &
	    ~CTRL_MIDI_EN;
	hwwrite(vortex->mmio, VORTEX_CTRL, temp);
#endif
	/* Mpu401UartInit() */
	mode = 1;
	temp = hwread(vortex->mmio, VORTEX_CTRL2) & 0xffff00cf;
	temp |= (MIDI_CLOCK_DIV << 8) | ((mode >> 24) & 0xff) << 4;
	hwwrite(vortex->mmio, VORTEX_CTRL2, temp);
	hwwrite(vortex->mmio, VORTEX_MIDI_CMD, MPU401_RESET);

	/* Check if anything is OK. */
	temp = hwread(vortex->mmio, VORTEX_MIDI_DATA);
	if (temp != MPU401_ACK /*0xfe */ ) {
		dev_err(vortex->card->dev, "midi port doesn't acknowledge!\n");
		return -ENODEV;
	}
	/* Enable MPU401 interrupts. */
	hwwrite(vortex->mmio, VORTEX_IRQ_CTRL,
		hwread(vortex->mmio, VORTEX_IRQ_CTRL) | IRQ_MIDI);

	/* Create MPU401 instance. */
#ifdef VORTEX_MPU401_LEGACY
	if ((temp =
	     snd_mpu401_uart_new(vortex->card, 0, MPU401_HW_MPU401, 0x330,
				 MPU401_INFO_IRQ_HOOK, -1, &rmidi)) != 0) {
		hwwrite(vortex->mmio, VORTEX_CTRL,
			(hwread(vortex->mmio, VORTEX_CTRL) &
			 ~CTRL_MIDI_PORT) & ~CTRL_MIDI_EN);
		return temp;
	}
#else
	port = (unsigned long)(vortex->mmio + VORTEX_MIDI_DATA);
	if ((temp =
	     snd_mpu401_uart_new(vortex->card, 0, MPU401_HW_AUREAL, port,
				 MPU401_INFO_INTEGRATED | MPU401_INFO_MMIO |
				 MPU401_INFO_IRQ_HOOK, -1, &rmidi)) != 0) {
		hwwrite(vortex->mmio, VORTEX_CTRL,
			(hwread(vortex->mmio, VORTEX_CTRL) &
			 ~CTRL_MIDI_PORT) & ~CTRL_MIDI_EN);
		return temp;
	}
	mpu = rmidi->private_data;
	mpu->cport = (unsigned long)(vortex->mmio + VORTEX_MIDI_CMD);
#endif
	/* Overwrite MIDI name */
	snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI %d", CARD_NAME_SHORT , vortex->card->number);

	vortex->rmidi = rmidi;
	return 0;
}
17ac649326f'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Jiri Kosina &lt;jkosina@suse.cz&gt;</td><td class='right'>2017-01-27 22:25:52 +0000</td></tr>
<tr><th>committer</th><td>Ingo Molnar &lt;mingo@kernel.org&gt;</td><td class='right'>2017-01-28 09:18:56 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/intel/skylake/skl-topology.h?id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>bf29bddf0417a4783da3b24e8c9e017ac649326f</a> (<a href='/cgit.cgi/linux/net-next.git/patch/sound/soc/intel/skylake/skl-topology.h?id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>54a05a4883b73f80e4e1d8c4b15750aa01c39932</a> /<a href='/cgit.cgi/linux/net-next.git/tree/sound/soc/intel/skylake/skl-topology.h?id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>sound/soc/intel/skylake/skl-topology.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/intel/skylake/skl-topology.h?id=883af14e67e8b8702b5560aa64c888c0cd0bd66c'>883af14e67e8b8702b5560aa64c888c0cd0bd66c</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/soc/intel/skylake/skl-topology.h?id=bf29bddf0417a4783da3b24e8c9e017ac649326f&amp;id2=883af14e67e8b8702b5560aa64c888c0cd0bd66c'>diff</a>)</td></tr></table>
<div class='commit-subject'>x86/efi: Always map the first physical page into the EFI pagetables</div><div class='commit-msg'>Commit:

  129766708 ("x86/efi: Only map RAM into EFI page tables if in mixed-mode")

stopped creating 1:1 mappings for all RAM, when running in native 64-bit mode.

It turns out though that there are 64-bit EFI implementations in the wild
(this particular problem has been reported on a Lenovo Yoga 710-11IKB),
which still make use of the first physical page for their own private use,
even though they explicitly mark it EFI_CONVENTIONAL_MEMORY in the memory
map.

In case there is no mapping for this particular frame in the EFI pagetables,
as soon as firmware tries to make use of it, a triple fault occurs and the
system reboots (in case of the Yoga 710-11IKB this is very early during bootup).

Fix that by always mapping the first page of physical memory into the EFI
pagetables. We're free to hand this page to the BIOS, as trim_bios_range()
will reserve the first page and isolate it away from memory allocators anyway.

Note that just reverting 129766708 alone is not enough on v4.9-rc1+ to fix the
regression on affected hardware, as this commit:

   ab72a27da ("x86/efi: Consolidate region mapping logic")

later made the first physical frame not to be mapped anyway.

Reported-by: Hanka Pavlikova &lt;hanka@ucw.cz&gt;
Signed-off-by: Jiri Kosina &lt;jkosina@suse.cz&gt;
Signed-off-by: Matt Fleming &lt;matt@codeblueprint.co.uk&gt;
Cc: Ard Biesheuvel &lt;ard.biesheuvel@linaro.org&gt;
Cc: Borislav Petkov &lt;bp@alien8.de&gt;
Cc: Borislav Petkov &lt;bp@suse.de&gt;
Cc: Laura Abbott &lt;labbott@redhat.com&gt;
Cc: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
Cc: Peter Zijlstra &lt;peterz@infradead.org&gt;
Cc: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Cc: Vojtech Pavlik &lt;vojtech@ucw.cz&gt;
Cc: Waiman Long &lt;waiman.long@hpe.com&gt;
Cc: linux-efi@vger.kernel.org
Cc: stable@kernel.org # v4.8+
Fixes: 129766708 ("x86/efi: Only map RAM into EFI page tables if in mixed-mode")
Link: http://lkml.kernel.org/r/20170127222552.22336-1-matt@codeblueprint.co.uk
[ Tidied up the changelog and the comment. ]
Signed-off-by: Ingo Molnar &lt;mingo@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>Diffstat</a> (limited to 'sound/soc/intel/skylake/skl-topology.h')</div><table summary='diffstat' class='diffstat'>