[lm-sensors] [PATCH 1/5] x86: base support for TS-5500 Single Board Computer

Vivien Didelot vivien.didelot at savoirfairelinux.com
Tue Jul 19 22:00:31 CEST 2011


Add base support for TS-5500 in arch/x86/platform/ts5500 and documentation in
Documentation/ABI/testing/sysfs-platform-ts5500.

Signed-off-by: Vivien Didelot <vivien.didelot at savoirfairelinux.com>
---
 Documentation/ABI/testing/sysfs-platform-ts5500 |   46 ++++
 MAINTAINERS                                     |    7 +
 arch/x86/Kconfig                                |    2 +
 arch/x86/platform/Makefile                      |    1 +
 arch/x86/platform/ts5500/Kconfig                |    7 +
 arch/x86/platform/ts5500/Makefile               |    1 +
 arch/x86/platform/ts5500/ts5500.c               |  296 +++++++++++++++++++++++
 7 files changed, 360 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-platform-ts5500
 create mode 100644 arch/x86/platform/ts5500/Kconfig
 create mode 100644 arch/x86/platform/ts5500/Makefile
 create mode 100644 arch/x86/platform/ts5500/ts5500.c

diff --git a/Documentation/ABI/testing/sysfs-platform-ts5500 b/Documentation/ABI/testing/sysfs-platform-ts5500
new file mode 100644
index 0000000..c870564
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-platform-ts5500
@@ -0,0 +1,46 @@
+What:		/sys/devices/platform/ts5500/id
+Date:		July 2011
+KernelVersion:	2.6.39
+Contact:	"Savoir-faire Linux, Inc." <kernel-ts at savoirfairelinux.com>
+Description:
+		Product ID of the TS board. TS-5500 ID is 0x60.
+
+What:		/sys/devices/platform/ts5500/sram
+Date:		July 2011
+KernelVersion:	2.6.39
+Contact:	"Savoir-faire Linux, Inc." <kernel-ts at 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:		July 2011
+KernelVersion:	2.6.39
+Contact:	"Savoir-faire Linux, Inc." <kernel-ts at 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:		July 2011
+KernelVersion:	2.6.39
+Contact:	"Savoir-faire Linux, Inc." <kernel-ts at 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:		July 2011
+KernelVersion:	2.6.39
+Contact:	"Savoir-faire Linux, Inc." <kernel-ts at 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:		July 2011
+KernelVersion:	2.6.39
+Contact:	"Savoir-faire Linux, Inc." <kernel-ts at savoirfairelinux.com>
+Description:
+		Say if the RS485 feature is present. If it is enabled, it
+		will display "1", otherwise "0".
\ No newline at end of file
diff --git a/MAINTAINERS b/MAINTAINERS
index 187282d..be8ce4b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6134,6 +6134,13 @@ W:	http://tcp-lp-mod.sourceforge.net/
 S:	Maintained
 F:	net/ipv4/tcp_lp.c
 
+TECHNOLOGIC SYSTEMS TS5500 MACHINE SUPPORT
+M:	Savoir-faire Linux Inc. <ts-kernel at savoirfairelinux.com>
+S:	Maintained
+F:  arch/x86/platform/ts5500/Kconfig
+F:  arch/x86/platform/ts5500/Makefile
+F:  arch/x86/platform/ts5500/ts5500.c
+
 TEGRA SUPPORT
 M:	Colin Cross <ccross at android.com>
 M:	Erik Gilling <konkers at android.com>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index da34972..cd4bf1a 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2079,6 +2079,8 @@ config OLPC_XO1
 	---help---
 	  Add support for non-essential features of the OLPC XO-1 laptop.
 
+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..6428ca5
--- /dev/null
+++ b/arch/x86/platform/ts5500/Kconfig
@@ -0,0 +1,7 @@
+config TS5500
+	bool "Technologic Systems TS-5500 Single Board Computer support"
+	depends on MELAN
+	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..0135dbd
--- /dev/null
+++ b/arch/x86/platform/ts5500/ts5500.c
@@ -0,0 +1,296 @@
+/*
+ * Technologic Systems TS-5500 board - SBC info layer
+ *
+ * Copyright (c) 2010-2011 Savoir-faire Linux Inc.
+ *	Alexandre Savard <alexandre.savard at savoirfairelinux.com>
+ *	Jonas Fonseca <jonas.fonseca at savoirfairelinux.com>
+ *	Vivien Didelot <vivien.didelot at savoirfairelinux.com>
+ *
+ * Portions originate from ts_sbcinfo.c (c) Technologic Systems
+ *	Liberty Young <liberty at 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_FLAG		0x40	/* RTS for RS-485 */
+#define TS5500_RS485_AUTO_FLAG		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_FLAG			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() - check for TS-5500 specific features
+ *
+ * It is not safe to read ID register if we are not sure that it's a TS SBC.
+ * Since TS SBCs don't have DMI support, it is safer to check for a TS-5500
+ * specific feature such as the processor.
+ */
+static int ts5500_pre_detect(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;
+}
+
+/**
+ * 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;
+
+	/* Firstly, check specific TS-5500 hardware, such as CPU. */
+	ret = ts5500_pre_detect();
+	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 at savoirfairelinux.com>");
+MODULE_AUTHOR("Alexandre Savard <alexandre.savard at savoirfairelinux.com>");
+MODULE_AUTHOR("Vivien Didelot <vivien.didelot at savoirfairelinux.com>");
+MODULE_DESCRIPTION("Technologic Systems TS-5500 Board's platform driver");
+MODULE_LICENSE("GPL");
-- 
1.7.6





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