[tip:x86/platform] x86/platform: Add TS-5500 base support

[tip-bot for Vivien Didelot <vivien.didelot@savoirfairelinux.com>]

Commit-ID:  37f9a16c166c51be114bb5b2ff670ccaa893f978
Gitweb:     http://git.kernel.org/tip/37f9a16c166c51be114bb5b2ff670ccaa893f978
Author:     Vivien Didelot <vivien.didelot@savoirfairelinux.com>
AuthorDate: Fri, 2 Sep 2011 14:30:21 -0400
Committer:  Ingo Molnar <mingo@elte.hu>
CommitDate: Wed, 12 Oct 2011 17:36:54 +0200

x86/platform: Add TS-5500 base support

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1314988224-13162-2-git-send-email-vivien.didelot@savoirfairelinux.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 Documentation/ABI/testing/sysfs-platform-ts5500 |   46 +++
 MAINTAINERS                                     |    5 +
 arch/x86/Kconfig                                |    2 +
 arch/x86/platform/Makefile                      |    1 +
 arch/x86/platform/ts5500/Kconfig                |    8 +
 arch/x86/platform/ts5500/Makefile               |    1 +
 arch/x86/platform/ts5500/ts5500.c               |  332 +++++++++++++++++++++++
 7 files changed, 395 insertions(+), 0 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-platform-ts5500 b/Documentation/ABI/testing/sysfs-platform-ts5500
new file mode 100644
index 0000000..a43bb52
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-platform-ts5500
@@ -0,0 +1,46 @@
+What:		/sys/devices/platform/ts5500/id
+Date:		August 2011
+KernelVersion:	3.0
+Contact:	"Savoir-faire Linux, Inc." <kernel-ts@savoirfairelinux.com>
+Description:
+		Product ID of the TS board. TS-5500 ID is 0x60.
+
+What:		/sys/devices/platform/ts5500/sram
+Date:		August 2011
+KernelVersion:	3.0
+Contact:	"Savoir-faire Linux, Inc." <kernel-ts@savoirfairelinux.com>
+Description:
+		Say if the SRAM feature is present. If it is enabled, it will
+		display "1", otherwise "0".
+
+What:		/sys/devices/platform/ts5500/ereset
+Date:		August 2011
+KernelVersion:	3.0
+Contact:	"Savoir-faire Linux, Inc." <kernel-ts@savoirfairelinux.com>
+Description:
+		Say if an external reset is present. If it is present, it will
+		display "1", otherwise "0".
+
+What:		/sys/devices/platform/ts5500/jp{1,2,3,4,5,6}
+Date:		August 2011
+KernelVersion:	3.0
+Contact:	"Savoir-faire Linux, Inc." <kernel-ts@savoirfairelinux.com>
+Description:
+		Show the state of a plugged jumper. If it is present, it will
+		display "1", otherwise "0".
+
+What:		/sys/devices/platform/ts5500/adc
+Date:		August 2011
+KernelVersion:	3.0
+Contact:	"Savoir-faire Linux, Inc." <kernel-ts@savoirfairelinux.com>
+Description:
+		Say if the Analogic to Digital Converter is present. If it is
+		enabled, it will display "1", otherwise "0".
+
+What:		/sys/devices/platform/ts5500/rs485
+Date:		August 2011
+KernelVersion:	3.0
+Contact:	"Savoir-faire Linux, Inc." <kernel-ts@savoirfairelinux.com>
+Description:
+		Say if the RS485 feature is present. If it is enabled, it
+		will display "1", otherwise "0".
diff --git a/MAINTAINERS b/MAINTAINERS
index 5483e0c..ded9e08 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6364,6 +6364,11 @@ W:	http://tcp-lp-mod.sourceforge.net/
 S:	Maintained
 F:	net/ipv4/tcp_lp.c
 
+TECHNOLOGIC SYSTEMS TS-5500 MACHINE SUPPORT
+M:	Savoir-faire Linux Inc. <ts-kernel@savoirfairelinux.com>
+S:	Maintained
+F:  arch/x86/platform/ts5500/*
+
 TEGRA SUPPORT
 M:	Colin Cross <ccross@android.com>
 M:	Olof Johansson <olof@lixom.net>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 6a47bb2..ec71069 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2064,6 +2064,8 @@ config OLPC_XO15_SCI
 	   - AC adapter status updates
 	   - Battery status updates
 
+source "arch/x86/platform/ts5500/Kconfig"
+
 endif # X86_32
 
 config AMD_NB
diff --git a/arch/x86/platform/Makefile b/arch/x86/platform/Makefile
index 021eee9..1bdc038 100644
--- a/arch/x86/platform/Makefile
+++ b/arch/x86/platform/Makefile
@@ -8,3 +8,4 @@ obj-y	+= scx200/
 obj-y	+= sfi/
 obj-y	+= visws/
 obj-y	+= uv/
+obj-y	+= ts5500/
diff --git a/arch/x86/platform/ts5500/Kconfig b/arch/x86/platform/ts5500/Kconfig
new file mode 100644
index 0000000..90c257a
--- /dev/null
+++ b/arch/x86/platform/ts5500/Kconfig
@@ -0,0 +1,8 @@
+config TS5500
+	bool "Technologic Systems TS-5500 Single Board Computer support"
+	depends on MELAN
+  select CHECK_SIGNATURE
+	help
+	  Add support for the Technologic Systems TS-5500 platform features.
+
+	  If you have a TS-5500, say Y here.
diff --git a/arch/x86/platform/ts5500/Makefile b/arch/x86/platform/ts5500/Makefile
new file mode 100644
index 0000000..0a689a7
--- /dev/null
+++ b/arch/x86/platform/ts5500/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_TS5500)			+= ts5500.o
diff --git a/arch/x86/platform/ts5500/ts5500.c b/arch/x86/platform/ts5500/ts5500.c
new file mode 100644
index 0000000..d50cd1b1
--- /dev/null
+++ b/arch/x86/platform/ts5500/ts5500.c
@@ -0,0 +1,332 @@
+/*
+ * Technologic Systems TS-5500 board - SBC info layer
+ *
+ * Copyright (c) 2010-2011 Savoir-faire Linux Inc.
+ *	Alexandre Savard <alexandre.savard@savoirfairelinux.com>
+ *	Jonas Fonseca <jonas.fonseca@savoirfairelinux.com>
+ *	Vivien Didelot <vivien.didelot@savoirfairelinux.com>
+ *
+ * Portions originate from ts_sbcinfo.c (c) Technologic Systems
+ *	Liberty Young <liberty@embeddedx86.com>
+ *
+ * These functions add sysfs platform entries to display information about
+ * the Technologic Systems TS-5500 Single Board Computer (SBC).
+ *
+ * For further information about sysfs entries, see
+ * Documentation/ABI/testing/sysfs-platform-ts5500
+ */
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/platform_device.h>
+#include <linux/kernel.h>
+#include <linux/mutex.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <asm/processor.h>
+
+/* Hardware info for pre-detection */
+#define AMD_ELAN_FAMILY			4
+#define AMD_ELAN_SC520			9
+
+/* Product code register */
+#define TS5500_PRODUCT_CODE_REG		0x74
+#define TS5500_PRODUCT_CODE		0x60	/* TS-5500 product code */
+
+/* SRAM/RS-485/ADC options, and RS-485 RTS/Automatic RS-485 flags register */
+#define TS5500_SRAM_RS485_ADC_REG	0x75
+#define TS5500_SRAM_OPT			0x01	/* SRAM option */
+#define TS5500_RS485_OPT		0x02	/* RS-485 option */
+#define TS5500_ADC_OPT			0x04	/* A/D converter option */
+#define TS5500_RS485_RTS_MASK		0x40	/* RTS for RS-485 */
+#define TS5500_RS485_AUTO_MASK		0x80	/* Automatic RS-485 */
+
+/* External Reset/Industrial Temperature Range options register */
+#define TS5500_ERESET_ITR_REG		0x76
+#define TS5500_ERESET_OPT		0x01	/*  External Reset option */
+#define TS5500_ITR_OPT			0x02	/* Indust. Temp. Range option */
+
+/* LED/Jumpers register */
+#define TS5500_LED_JMPRS_REG		0x77
+#define TS5500_LED_MASK			0x01	/* LED flag */
+#define TS5500_JP1			0x02	/* Automatic CMOS */
+#define TS5500_JP2			0x04	/* Enable Serial Console */
+#define TS5500_JP3			0x08	/* Write Enable Drive A */
+#define TS5500_JP4			0x10	/* Fast Console (115K baud) */
+#define TS5500_JP5			0x20	/* User Jumper */
+#define TS5500_JP6			0x40	/* Console on COM1 (req. JP2) */
+#define TS5500_JP7			0x80	/* Undocumented (Unused) */
+
+/**
+ * struct ts5500_sbc - TS-5500 SBC main structure
+ * @lock:		Read/Write mutex.
+ * @board_id:		Board name.
+ * @sram:		Check SRAM option.
+ * @rs485:		Check RS-485 option.
+ * @adc:		Check Analogic/Digital converter option.
+ * @ereset:		Check External Reset option.
+ * @itr:		Check Industrial Temperature Range option.
+ * @jumpers:		States of jumpers 1-7.
+ */
+struct ts5500_sbc {
+	struct mutex		lock;
+	int			board_id;
+	bool			sram;
+	bool			rs485;
+	bool			adc;
+	bool			ereset;
+	bool			itr;
+	u8			jumpers;
+};
+
+/* Current platform */
+struct ts5500_sbc *ts5500;
+
+/**
+ * ts5500_pre_detect_hw() - check for TS-5500 specific hardware
+ */
+static __init int ts5500_pre_detect_hw(void)
+{
+	/* Check for AMD ElanSC520 Microcontroller */
+	if (cpu_info.x86_vendor != X86_VENDOR_AMD ||
+	    cpu_info.x86 != AMD_ELAN_FAMILY	  ||
+	    cpu_info.x86_model != AMD_ELAN_SC520)
+		return -ENODEV;
+
+	return 0;
+}
+
+/* BIOS signatures */
+static struct {
+	const unsigned char *string;
+	const ssize_t offset;
+} signatures[] __initdata = {
+	{"TS-5x00 AMD Elan", 0xb14}
+};
+
+/**
+ * ts5500_bios_signature() - find board signature in BIOS shadow RAM.
+ */
+static __init int ts5500_bios_signature(void)
+{
+	void __iomem *bios = ioremap(0xF0000, 0x10000);
+	int i, ret = 0;
+
+	for (i = 0; i < ARRAY_SIZE(signatures); i++)
+		if (check_signature(bios + signatures[i].offset,
+				    signatures[i].string,
+				    strlen(signatures[i].string)))
+			goto found;
+		else
+			pr_notice("Technologic Systems BIOS signature "
+				  "'%s' not found at offset %zd\n",
+				  signatures[i].string, signatures[i].offset);
+	ret = -ENODEV;
+found:
+	iounmap(bios);
+	return ret;
+}
+
+/**
+ * ts5500_detect_config() - detect the TS board
+ * @sbc:		Structure where to store the detected board's details.
+ */
+static int ts5500_detect_config(struct ts5500_sbc *sbc)
+{
+	u8 tmp;
+	int ret = 0;
+
+	if (!request_region(TS5500_PRODUCT_CODE_REG, 4, "ts5500"))
+		return -EBUSY;
+
+	mutex_lock(&ts5500->lock);
+	tmp = inb(TS5500_PRODUCT_CODE_REG);
+	if (tmp != TS5500_PRODUCT_CODE) {
+		pr_err("This platform is not a TS-5500 (found ID 0x%x)\n", tmp);
+		ret = -ENODEV;
+		goto error;
+	}
+	sbc->board_id = tmp;
+
+	tmp = inb(TS5500_SRAM_RS485_ADC_REG);
+	ts5500->sram = !!(tmp & TS5500_SRAM_OPT);
+	ts5500->rs485 = !!(tmp & TS5500_RS485_OPT);
+	ts5500->adc = !!(tmp & TS5500_ADC_OPT);
+
+	tmp = inb(TS5500_ERESET_ITR_REG);
+	ts5500->ereset = !!(tmp & TS5500_ERESET_OPT);
+	ts5500->itr = !!(tmp & TS5500_ITR_OPT);
+
+	tmp = inb(TS5500_LED_JMPRS_REG);
+	sbc->jumpers = tmp & 0xFE;	/* All bits except the first (LED) */
+
+error:
+	mutex_unlock(&ts5500->lock);
+	release_region(TS5500_PRODUCT_CODE_REG, 4);
+	return ret;
+}
+
+#define TS5500_IS_JP_SET(sbc, jmp) (!!(sbc->jumpers & TS5500_JP##jmp))
+
+static struct platform_device *ts5500_devices[] __initdata = {
+};
+
+static ssize_t ts5500_show_id(struct device *dev,
+			      struct device_attribute *attr, char *buf)
+{
+	struct ts5500_sbc *sbc = dev_get_drvdata(dev);
+
+	return sprintf(buf, "0x%x\n", sbc->board_id);
+}
+
+static ssize_t ts5500_show_sram(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct ts5500_sbc *sbc = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%d\n", sbc->sram);
+}
+
+static ssize_t ts5500_show_rs485(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	struct ts5500_sbc *sbc = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%d\n", sbc->rs485);
+}
+
+static ssize_t ts5500_show_adc(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	struct ts5500_sbc *sbc = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%d\n", sbc->adc);
+}
+
+static ssize_t ts5500_show_ereset(struct device *dev,
+					  struct device_attribute *attr,
+					  char *buf)
+{
+	struct ts5500_sbc *sbc = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%d\n", sbc->ereset);
+}
+
+static ssize_t ts5500_show_itr(struct device *dev,
+			       struct device_attribute *attr,
+			       char *buf)
+{
+	struct ts5500_sbc *sbc = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%d\n", sbc->itr);
+}
+
+#define TS5500_SHOW_JP(jp)						\
+	static ssize_t ts5500_show_jp##jp(struct device *dev,		\
+					  struct device_attribute *attr,\
+					  char *buf)			\
+	{								\
+		struct ts5500_sbc *sbc = dev_get_drvdata(dev);		\
+		return sprintf(buf, "%d\n", TS5500_IS_JP_SET(sbc, jp)); \
+	}
+
+TS5500_SHOW_JP(1)
+TS5500_SHOW_JP(2)
+TS5500_SHOW_JP(3)
+TS5500_SHOW_JP(4)
+TS5500_SHOW_JP(5)
+TS5500_SHOW_JP(6)
+
+static DEVICE_ATTR(id, S_IRUGO, ts5500_show_id, NULL);
+static DEVICE_ATTR(sram, S_IRUGO, ts5500_show_sram, NULL);
+static DEVICE_ATTR(rs485, S_IRUGO, ts5500_show_rs485, NULL);
+static DEVICE_ATTR(adc, S_IRUGO, ts5500_show_adc, NULL);
+static DEVICE_ATTR(ereset, S_IRUGO, ts5500_show_ereset, NULL);
+static DEVICE_ATTR(itr, S_IRUGO, ts5500_show_itr, NULL);
+static DEVICE_ATTR(jp1, S_IRUGO, ts5500_show_jp1, NULL);
+static DEVICE_ATTR(jp2, S_IRUGO, ts5500_show_jp2, NULL);
+static DEVICE_ATTR(jp3, S_IRUGO, ts5500_show_jp3, NULL);
+static DEVICE_ATTR(jp4, S_IRUGO, ts5500_show_jp4, NULL);
+static DEVICE_ATTR(jp5, S_IRUGO, ts5500_show_jp5, NULL);
+static DEVICE_ATTR(jp6, S_IRUGO, ts5500_show_jp6, NULL);
+
+static struct attribute *ts5500_attributes[] = {
+	&dev_attr_id.attr,
+	&dev_attr_sram.attr,
+	&dev_attr_rs485.attr,
+	&dev_attr_adc.attr,
+	&dev_attr_ereset.attr,
+	&dev_attr_itr.attr,
+	&dev_attr_jp1.attr,
+	&dev_attr_jp2.attr,
+	&dev_attr_jp3.attr,
+	&dev_attr_jp4.attr,
+	&dev_attr_jp5.attr,
+	&dev_attr_jp6.attr,
+	NULL
+};
+
+static const struct attribute_group ts5500_attr_group = {
+	.attrs = ts5500_attributes
+};
+
+static int __init ts5500_init(void)
+{
+	int ret;
+	struct platform_device *pdev;
+
+	/*
+	 * There is no DMI available, or PCI bridge subvendor info,
+	 * only the BIOS provides a 16-bit identification call.
+	 * It is safer to check for a TS-5500 specific hardware
+	 * such as the processor, then find a signature in the BIOS.
+	 */
+	ret = ts5500_pre_detect_hw();
+	if (ret)
+		return ret;
+
+	ret = ts5500_bios_signature();
+	if (ret)
+		return ret;
+
+	ts5500 = kzalloc(sizeof(struct ts5500_sbc), GFP_KERNEL);
+	if (!ts5500)
+		return -ENOMEM;
+	mutex_init(&ts5500->lock);
+
+	ret = ts5500_detect_config(ts5500);
+	if (ret)
+		goto release_mem;
+
+	pdev = platform_device_register_simple("ts5500", -1, NULL, 0);
+	if (IS_ERR(pdev)) {
+		ret = PTR_ERR(pdev);
+		goto release_mem;
+	}
+	platform_set_drvdata(pdev, ts5500);
+
+	ret = platform_add_devices(ts5500_devices, ARRAY_SIZE(ts5500_devices));
+	if (ret)
+		goto release_pdev;
+
+	ret = sysfs_create_group(&pdev->dev.kobj,
+				 &ts5500_attr_group);
+	if (ret)
+		goto release_pdev;
+
+	return 0;
+
+release_pdev:
+	platform_device_unregister(pdev);
+release_mem:
+	kfree(ts5500);
+
+	return ret;
+}
+postcore_initcall(ts5500_init);
+
+MODULE_AUTHOR("Jonas Fonseca <jonas.fonseca@savoirfairelinux.com>");
+MODULE_AUTHOR("Alexandre Savard <alexandre.savard@savoirfairelinux.com>");
+MODULE_AUTHOR("Vivien Didelot <vivien.didelot@savoirfairelinux.com>");
+MODULE_DESCRIPTION("Technologic Systems TS-5500 Board's platform driver");
+MODULE_LICENSE("GPL");