[PATCH v6 2/3] x86/platform: TS-5500 basic platform support
From: Vivien Didelot
Date: Thu Apr 12 2012 - 20:42:27 EST
Signed-off-by: Vivien Didelot <vivien.didelot@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/ABI/testing/sysfs-platform-ts5500 | 46 +++
MAINTAINERS | 5 +
arch/x86/Kconfig | 8 +
arch/x86/platform/Makefile | 1 +
arch/x86/platform/ts5500/Makefile | 1 +
arch/x86/platform/ts5500/ts5500.c | 400 +++++++++++++++++++++++
6 files changed, 461 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-platform-ts5500
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..bc29bb8
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-platform-ts5500
@@ -0,0 +1,46 @@
+What: /sys/devices/platform/ts5500/id
+Date: April 2012
+KernelVersion: 3.3
+Contact: "Savoir-faire Linux Inc." <kernel@xxxxxxxxxxxxxxxxxxxx>
+Description:
+ Product ID of the TS board. TS-5500 ID is 0x60.
+
+What: /sys/devices/platform/ts5500/sram
+Date: April 2012
+KernelVersion: 3.3
+Contact: "Savoir-faire Linux Inc." <kernel@xxxxxxxxxxxxxxxxxxxx>
+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: April 2012
+KernelVersion: 3.3
+Contact: "Savoir-faire Linux Inc." <kernel@xxxxxxxxxxxxxxxxxxxx>
+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: April 2012
+KernelVersion: 3.3
+Contact: "Savoir-faire Linux Inc." <kernel@xxxxxxxxxxxxxxxxxxxx>
+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: April 2012
+KernelVersion: 3.3
+Contact: "Savoir-faire Linux Inc." <kernel@xxxxxxxxxxxxxxxxxxxx>
+Description:
+ Say if the A/D Converter is present. If it is enabled,
+ it will display "1", otherwise "0".
+
+What: /sys/devices/platform/ts5500/rs485
+Date: April 2012
+KernelVersion: 3.3
+Contact: "Savoir-faire Linux Inc." <kernel@xxxxxxxxxxxxxxxxxxxx>
+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 2dcfca8..b126129 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6620,6 +6620,11 @@ S: Supported
F: drivers/net/team/
F: include/linux/if_team.h
+TECHNOLOGIC SYSTEMS TS-5500 MACHINE SUPPORT
+M: Savoir-faire Linux Inc. <kernel@xxxxxxxxxxxxxxxxxxxx>
+S: Maintained
+F: arch/x86/platform/ts5500/
+
TEGRA SUPPORT
M: Colin Cross <ccross@xxxxxxxxxxx>
M: Olof Johansson <olof@xxxxxxxxx>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 1d14cc6..55f32b5 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2131,6 +2131,14 @@ config GEOS
---help---
This option enables system support for the Traverse Technologies GEOS.
+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 SBC.
+ If you have a TS-5500 platform, say Y here.
+
endif # X86_32
config AMD_NB
diff --git a/arch/x86/platform/Makefile b/arch/x86/platform/Makefile
index 8d87439..f50911b 100644
--- a/arch/x86/platform/Makefile
+++ b/arch/x86/platform/Makefile
@@ -7,5 +7,6 @@ obj-y += mrst/
obj-y += olpc/
obj-y += scx200/
obj-y += sfi/
+obj-y += ts5500/
obj-y += visws/
obj-y += uv/
diff --git a/arch/x86/platform/ts5500/Makefile b/arch/x86/platform/ts5500/Makefile
new file mode 100644
index 0000000..c54e348
--- /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..96f76c0
--- /dev/null
+++ b/arch/x86/platform/ts5500/ts5500.c
@@ -0,0 +1,400 @@
+/*
+ * Technologic Systems TS-5500 board - SBC info layer
+ *
+ * Copyright (c) 2010-2012 Savoir-faire Linux Inc.
+ * Vivien Didelot <vivien.didelot@xxxxxxxxxxxxxxxxxxxx>
+ * Alexandre Savard <alexandre.savard@xxxxxxxxxxxxxxxxxxxx>
+ * Jonas Fonseca <jonas.fonseca@xxxxxxxxxxxxxxxxxxxx>
+ *
+ * Portions originate from ts_sbcinfo.c (c) Technologic Systems
+ * Liberty Young <liberty@xxxxxxxxxxxxxxx>
+ *
+ * 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>
+#include <linux/leds.h>
+#include <linux/delay.h>
+#include <linux/max197.h>
+
+/* Hardware info for pre-detection */
+#define AMD_ELAN_FAMILY 4
+#define AMD_ELAN_SC520 9
+
+/* Product code register */
+#define TS5500_PRODUCT_CODE_ADDR 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_ADDR 0x75
+#define TS5500_SRAM 0x01 /* SRAM option */
+#define TS5500_RS485 0x02 /* RS-485 option */
+#define TS5500_ADC 0x04 /* A/D converter option */
+#define TS5500_RS485_RTS 0x40 /* RTS for RS-485 */
+#define TS5500_RS485_AUTO 0x80 /* Automatic RS-485 */
+
+/* External Reset/Industrial Temperature Range options register */
+#define TS5500_ERESET_ITR_ADDR 0x76
+#define TS5500_ERESET 0x01 /* External Reset option */
+#define TS5500_ITR 0x02 /* Indust. Temp. Range option */
+
+/* LED/Jumpers register */
+#define TS5500_LED_JP_ADDR 0x77
+#define TS5500_LED 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) */
+
+/* A/D Converter registers */
+#define TS5500_ADC_CONV_BUSY_ADDR 0x195 /* Conversion state register */
+#define TS5500_ADC_CONV_BUSY 0x01
+#define TS5500_ADC_CONV_INIT_LSB_ADDR 0x196 /* Start conv. / LSB register */
+#define TS5500_ADC_CONV_MSB_ADDR 0x197 /* MSB register */
+#define TS5500_ADC_CONV_DELAY 12 /* usec */
+
+/**
+ * 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 Analog/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 int __init 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 int __init 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 in which the detected board's details will be stored.
+ */
+static int __init ts5500_detect_config(struct ts5500_sbc *sbc)
+{
+ u8 tmp;
+ int ret = 0;
+
+ if (!request_region(TS5500_PRODUCT_CODE_ADDR, 4, "ts5500"))
+ return -EBUSY;
+
+ mutex_lock(&ts5500->lock);
+ tmp = inb(TS5500_PRODUCT_CODE_ADDR);
+ if (tmp != TS5500_PRODUCT_CODE) {
+ pr_err("This platform is not a TS-5500 (found ID 0x%x)\n", tmp);
+ ret = -ENODEV;
+ goto cleanup;
+ }
+ sbc->board_id = tmp;
+
+ tmp = inb(TS5500_SRAM_RS485_ADC_ADDR);
+ ts5500->sram = tmp & TS5500_SRAM;
+ ts5500->rs485 = tmp & TS5500_RS485;
+ ts5500->adc = tmp & TS5500_ADC;
+
+ tmp = inb(TS5500_ERESET_ITR_ADDR);
+ ts5500->ereset = tmp & TS5500_ERESET;
+ ts5500->itr = tmp & TS5500_ITR;
+
+ tmp = inb(TS5500_LED_JP_ADDR);
+ sbc->jumpers = tmp & ~TS5500_LED;
+
+cleanup:
+ mutex_unlock(&ts5500->lock);
+ release_region(TS5500_PRODUCT_CODE_ADDR, 4);
+ return ret;
+}
+
+#define TS5500_IS_JP_SET(sbc, jmp) (!!(sbc->jumpers & TS5500_JP##jmp))
+
+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,
+};
+
+/* LED platform device */
+
+static void ts5500_led_set(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+{
+ outb(!!brightness, TS5500_LED_JP_ADDR);
+}
+
+static enum led_brightness ts5500_led_get(struct led_classdev *led_cdev)
+{
+ return (inb(TS5500_LED_JP_ADDR) & TS5500_LED) ? LED_FULL : LED_OFF;
+}
+
+static struct led_classdev ts5500_led_cdev = {
+ .name = "ts5500:green:activity",
+ .brightness_set = ts5500_led_set,
+ .brightness_get = ts5500_led_get,
+};
+
+/* A/D Converter platform device */
+
+static int ts5500_adc_convert(u8 ctrl, u16 *raw)
+{
+ u8 lsb, msb;
+
+ /* Start convertion (ensure the 3 MSB are set to 0) */
+ outb(ctrl & 0x1F, TS5500_ADC_CONV_INIT_LSB_ADDR);
+
+ udelay(TS5500_ADC_CONV_DELAY);
+ if (inb(TS5500_ADC_CONV_BUSY_ADDR) & TS5500_ADC_CONV_BUSY)
+ return -EBUSY;
+
+ /* Read the raw data */
+ lsb = inb(TS5500_ADC_CONV_INIT_LSB_ADDR);
+ msb = inb(TS5500_ADC_CONV_MSB_ADDR);
+ *raw = (msb << 8) | lsb;
+
+ return 0;
+}
+
+static struct max197_platform_data ts5500_adc_pdata = {
+ .convert = ts5500_adc_convert,
+};
+
+static void ts5500_adc_release(struct device *dev)
+{
+ /* noop */
+}
+
+static struct platform_device ts5500_adc_pdev = {
+ .name = "max197",
+ .id = -1,
+ .dev = {
+ .platform_data = &ts5500_adc_pdata,
+ .release = ts5500_adc_release,
+ },
+};
+
+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 = sysfs_create_group(&pdev->dev.kobj,
+ &ts5500_attr_group);
+ if (ret)
+ goto release_pdev;
+
+ if (led_classdev_register(&pdev->dev, &ts5500_led_cdev))
+ dev_warn(ts5500_led_cdev.dev, "failed to register the LED\n");
+ if (ts5500->adc) {
+ ts5500_adc_pdev.dev.parent = &pdev->dev;
+ if (platform_device_register(&ts5500_adc_pdev))
+ dev_warn(&ts5500_adc_pdev.dev,
+ "failed to register the A/D converter\n");
+ }
+
+ return 0;
+
+release_pdev:
+ platform_device_unregister(pdev);
+release_mem:
+ kfree(ts5500);
+
+ return ret;
+}
+device_initcall(ts5500_init);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Savoir-faire Linux Inc. <kernel@xxxxxxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Technologic Systems TS-5500 Board's platform driver");
--
1.7.9.2
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