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Message-ID: <20100913100719.GA3903@pema>
Date: Mon, 13 Sep 2010 12:07:19 +0200
From: Shérab <Sebastien.Hinderer@...-lyon.org>
To: "H. Peter Anvin" <hpa@...or.com>
Cc: Len Brown <lenb@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
Andrew Morton <akpm@...ux-foundation.org>,
Frederic Weisbecker <fweisbec@...il.com>,
Andres Salomon <dilinger@...ued.net>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Samuel Thibault <Samuel.Thibault@...-lyon.org>
Subject: Re: [PATCH] x86: EuroBraille/Iris power off
Dear all,
This thread has been sleeping for a few days now so I'm trying to wake
it up.
Brief summary: the included patch provides an iris module with a power
off function for a machine that, as has already been seen, has no APM,
no ACPI and no DMI.
The output of lspci -vv -n is included again.
Thanks for your attention,
Shérab.
00:00.0 0600: 1078:0001
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0
00:02.0 0200: 1282:9102 (rev 40)
Subsystem: 0291:8212
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 165 (5000ns min, 10000ns max)
Interrupt: pin A routed to IRQ 11
Region 0: I/O ports at 1000 [size=256]
Region 1: Memory at fedfe000 (32-bit, non-prefetchable) [size=256]
[virtual] Expansion ROM at 08000000 [disabled] [size=256K]
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=160mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
Kernel driver in use: dmfe
00:12.0 0601: 1078:0100 (rev 30)
Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV+ VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 64, Cache Line Size: 16 bytes
00:12.1 0680: 1078:0101
Control: I/O- Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Region 0: Memory at 40012000 (32-bit, non-prefetchable) [size=256]
00:12.2 0101: 1078:0102 (prog-if 80 [Master])
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0
Region 0: [virtual] Memory at 000001f0 (32-bit, non-prefetchable) [size=8]
Region 1: [virtual] Memory at 000003f0 (type 3, non-prefetchable) [size=1]
Region 2: [virtual] Memory at 00000170 (32-bit, non-prefetchable) [size=8]
Region 3: [virtual] Memory at 00000370 (type 3, non-prefetchable) [size=1]
Region 4: I/O ports at 1400 [size=16]
Kernel driver in use: CS5530 IDE
00:12.3 0401: 1078:0103
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0
Region 0: Memory at 40011000 (32-bit, non-prefetchable) [size=128]
Kernel driver in use: CS5530_Audio
00:12.4 0300: 1078:0104 (prog-if 00 [VGA controller])
Subsystem: 1078:0001
Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Region 0: Memory at 40800000 (32-bit, non-prefetchable) [size=8M]
Expansion ROM at <unassigned> [disabled]
00:13.0 0c03: 0e11:a0f8 (rev 06) (prog-if 10 [OHCI])
Subsystem: 0e11:a0f8
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 64 (20000ns max)
Interrupt: pin A routed to IRQ 9
Region 0: Memory at fedff000 (32-bit, non-prefetchable) [size=4K]
Kernel driver in use: ohci_hcd
>From 197e523553a791f97536143001f22abd36f7992c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sh=C3=A9rab?= <Sebastien.Hinderer@...-lyon.org>
Date: Wed, 25 Aug 2010 23:00:14 +0200
Subject: [PATCH] Eurobraille/Iris power off.
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Content-Type: text/plain; charset="utf-8"
The Iris machines from EuroBraille do not have APM or ACPI support
to shut themselves down properly. A special I/O sequence is
needed to do so. This modle runs this I/O sequence at
kernel shutdown.
This is only for Iris machines from EuroBraille.
Signed-off-by: Shérab <Sebastien.Hinderer@...-lyon.org>
---
arch/x86/Kconfig | 13 +++++++
arch/x86/kernel/Makefile | 1 +
arch/x86/kernel/iris.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 94 insertions(+), 0 deletions(-)
create mode 100644 arch/x86/kernel/iris.c
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index ac7827f..88bf897 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -493,6 +493,19 @@ config X86_ES7000
Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
supposed to run on an IA32-based Unisys ES7000 system.
+config X86_32_IRIS
+ tristate "Eurobraille/Iris poweroff module"
+ depends on X86_32
+ ---help---
+ The Iris machines from EuroBraille do not have APM or ACPI support
+ to shut themselves down properly. A special I/O sequence is
+ needed to do so, which is what this module does at
+ kernel shutdown.
+
+ This is only for Iris machines from EuroBraille.
+
+ If unused, say N.
+
config SCHED_OMIT_FRAME_POINTER
def_bool y
prompt "Single-depth WCHAN output"
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 0925676..98dd1c8 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -115,6 +115,7 @@ obj-$(CONFIG_MICROCODE) += microcode.o
obj-$(CONFIG_X86_CHECK_BIOS_CORRUPTION) += check.o
obj-$(CONFIG_SWIOTLB) += pci-swiotlb.o
+obj-$(CONFIG_X86_32_IRIS) += iris.o
###
# 64 bit specific files
diff --git a/arch/x86/kernel/iris.c b/arch/x86/kernel/iris.c
new file mode 100644
index 0000000..8856ef3
--- /dev/null
+++ b/arch/x86/kernel/iris.c
@@ -0,0 +1,80 @@
+/*
+ * Eurobraille/Iris power off support.
+ *
+ * Eurobraille's Iris machine is a PC with no APM or ACPI support.
+ * It is shutdown by a special I/O sequence which this module provides.
+ *
+ * Copyright (C) Shérab <Sebastien.Hinderer@...-lyon.org>
+ *
+ * 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 the program ; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/pm.h>
+#include <linux/delay.h>
+#include <asm/io.h>
+
+#define IRIS_GIO_BASE 0x340
+#define IRIS_GIO_INPUT IRIS_GIO_BASE
+#define IRIS_GIO_OUTPUT (IRIS_GIO_BASE + 1)
+#define IRIS_GIO_PULSE 0x80 /* First byte to send */
+#define IRIS_GIO_REST 0x0 /* Second byte to send */
+#define IRIS_GIO_NODEV 0xff /* Likely not an Iris */
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Sébastien Hinderer <Sebastien.Hinderer@...-lyon.org>");
+MODULE_DESCRIPTION("A power_off handler for Iris devices from EuroBraille");
+MODULE_SUPPORTED_DEVICE("Eurobraille/Iris");
+
+static void (*old_pm_power_off)(void);
+
+static void iris_power_off(void)
+{
+ outb(IRIS_GIO_PULSE, IRIS_GIO_OUTPUT);
+ msleep(850);
+ outb(IRIS_GIO_REST, IRIS_GIO_OUTPUT);
+}
+
+/*
+ * Before installing the power_off handler, try to make sure the OS is
+ * running on an Iris. Since Iris does not support DMI, this is done
+ * by reading its input port and seeing whether the read value is
+ * meaningful.
+ */
+static int iris_init(void)
+{
+ unsigned char status = inb(IRIS_GIO_INPUT);
+ if (status == IRIS_GIO_NODEV) {
+ printk(KERN_ERR "This machine does not seem to be an Iris. Power_off handler not installed.\n");
+ return -ENODEV;
+ }
+ old_pm_power_off = pm_power_off;
+ pm_power_off = &iris_power_off;
+ printk(KERN_INFO "Iris power_off handler installed.\n");
+ return 0;
+}
+
+static void iris_exit(void)
+{
+ pm_power_off = old_pm_power_off;
+ printk(KERN_INFO "Iris power_off handler uninstalled.\n");
+}
+
+module_init(iris_init);
+module_exit(iris_exit);
+
--
1.7.1
--
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