2 files changed, 340 insertions, 0 deletions

diff --git a/arch/x86/platform/ts5500/Makefile b/arch/x86/platform/ts5500/Makefile
new file mode 100644
index 000000000000..c54e348c96a7
--- /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 000000000000..39febb214e8c
--- /dev/null
+++ b/arch/x86/platform/ts5500/ts5500.c
@@ -0,0 +1,339 @@
+/*
+ * Technologic Systems TS-5500 Single Board Computer support
+ *
+ * Copyright (C) 2013 Savoir-faire Linux Inc.
+ *      Vivien Didelot <vivien.didelot@savoirfairelinux.com>
+ *
+ * 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 driver registers the Technologic Systems TS-5500 Single Board Computer
+ * (SBC) and its devices, and exposes information to userspace such as jumpers'
+ * state or available options. For further information about sysfs entries, see
+ * Documentation/ABI/testing/sysfs-platform-ts5500.
+ *
+ * This code actually supports the TS-5500 platform, but it may be extended to
+ * support similar Technologic Systems x86-based platforms, such as the TS-5600.
+ */
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/platform_data/gpio-ts5500.h>
+#include <linux/platform_data/max197.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+/* 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                     BIT(0)  /* SRAM option */
+#define TS5500_RS485                    BIT(1)  /* RS-485 option */
+#define TS5500_ADC                      BIT(2)  /* A/D converter option */
+#define TS5500_RS485_RTS                BIT(6)  /* RTS for RS-485 */
+#define TS5500_RS485_AUTO               BIT(7)  /* Automatic RS-485 */
+
+/* External Reset/Industrial Temperature Range options register */
+#define TS5500_ERESET_ITR_ADDR          0x76
+#define TS5500_ERESET                   BIT(0)  /* External Reset option */
+#define TS5500_ITR                      BIT(1)  /* Indust. Temp. Range option */
+
+/* LED/Jumpers register */
+#define TS5500_LED_JP_ADDR              0x77
+#define TS5500_LED                      BIT(0)  /* LED flag */
+#define TS5500_JP1                      BIT(1)  /* Automatic CMOS */
+#define TS5500_JP2                      BIT(2)  /* Enable Serial Console */
+#define TS5500_JP3                      BIT(3)  /* Write Enable Drive A */
+#define TS5500_JP4                      BIT(4)  /* Fast Console (115K baud) */
+#define TS5500_JP5                      BIT(5)  /* User Jumper */
+#define TS5500_JP6                      BIT(6)  /* Console on COM1 (req. JP2) */
+#define TS5500_JP7                      BIT(7)  /* Undocumented (Unused) */
+
+/* A/D Converter registers */
+#define TS5500_ADC_CONV_BUSY_ADDR       0x195   /* Conversion state register */
+#define TS5500_ADC_CONV_BUSY            BIT(0)
+#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 board description
+ * @id:         Board product ID.
+ * @sram:       Flag for SRAM option.
+ * @rs485:      Flag for RS-485 option.
+ * @adc:        Flag for Analog/Digital converter option.
+ * @ereset:     Flag for External Reset option.
+ * @itr:        Flag for Industrial Temperature Range option.
+ * @jumpers:    Bitfield for jumpers' state.
+ */
+struct ts5500_sbc {
+        int     id;
+        bool    sram;
+        bool    rs485;
+        bool    adc;
+        bool    ereset;
+        bool    itr;
+        u8      jumpers;
+};
+
+/* Board signatures in BIOS shadow RAM */
+static const struct {
+        const char * const string;
+        const ssize_t offset;
+} ts5500_signatures[] __initdata = {
+        { "TS-5x00 AMD Elan", 0xb14 },
+};
+
+static int __init ts5500_check_signature(void)
+{
+        void __iomem *bios;
+        int i, ret = -ENODEV;
+
+        bios = ioremap(0xf0000, 0x10000);
+        if (!bios)
+                return -ENOMEM;
+
+        for (i = 0; i < ARRAY_SIZE(ts5500_signatures); i++) {
+                if (check_signature(bios + ts5500_signatures[i].offset,
+                                    ts5500_signatures[i].string,
+                                    strlen(ts5500_signatures[i].string))) {
+                        ret = 0;
+                        break;
+                }
+        }
+
+        iounmap(bios);
+        return ret;
+}
+
+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;
+
+        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->id = tmp;
+
+        tmp = inb(TS5500_SRAM_RS485_ADC_ADDR);
+        sbc->sram = tmp & TS5500_SRAM;
+        sbc->rs485 = tmp & TS5500_RS485;
+        sbc->adc = tmp & TS5500_ADC;
+
+        tmp = inb(TS5500_ERESET_ITR_ADDR);
+        sbc->ereset = tmp & TS5500_ERESET;
+        sbc->itr = tmp & TS5500_ITR;
+
+        tmp = inb(TS5500_LED_JP_ADDR);
+        sbc->jumpers = tmp & ~TS5500_LED;
+
+cleanup:
+        release_region(TS5500_PRODUCT_CODE_ADDR, 4);
+        return ret;
+}
+
+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%.2x\n", sbc->id);
+}
+
+static ssize_t ts5500_show_jumpers(struct device *dev,
+                                   struct device_attribute *attr,
+                                   char *buf)
+{
+        struct ts5500_sbc *sbc = dev_get_drvdata(dev);
+
+        return sprintf(buf, "0x%.2x\n", sbc->jumpers >> 1);
+}
+
+#define TS5500_SHOW(field)                                      \
+        static ssize_t ts5500_show_##field(struct device *dev,  \
+                        struct device_attribute *attr,          \
+                        char *buf)                              \
+        {                                                       \
+                struct ts5500_sbc *sbc = dev_get_drvdata(dev);  \
+                return sprintf(buf, "%d\n", sbc->field);        \
+        }
+
+TS5500_SHOW(sram)
+TS5500_SHOW(rs485)
+TS5500_SHOW(adc)
+TS5500_SHOW(ereset)
+TS5500_SHOW(itr)
+
+static DEVICE_ATTR(id, S_IRUGO, ts5500_show_id, NULL);
+static DEVICE_ATTR(jumpers, S_IRUGO, ts5500_show_jumpers, 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 struct attribute *ts5500_attributes[] = {
+        &dev_attr_id.attr,
+        &dev_attr_jumpers.attr,
+        &dev_attr_sram.attr,
+        &dev_attr_rs485.attr,
+        &dev_attr_adc.attr,
+        &dev_attr_ereset.attr,
+        &dev_attr_itr.attr,
+        NULL
+};
+
+static const struct attribute_group ts5500_attr_group = {
+        .attrs = ts5500_attributes,
+};
+
+static struct resource ts5500_dio1_resource[] = {
+        DEFINE_RES_IRQ_NAMED(7, "DIO1 interrupt"),
+};
+
+static struct platform_device ts5500_dio1_pdev = {
+        .name = "ts5500-dio1",
+        .id = -1,
+        .resource = ts5500_dio1_resource,
+        .num_resources = 1,
+};
+
+static struct resource ts5500_dio2_resource[] = {
+        DEFINE_RES_IRQ_NAMED(6, "DIO2 interrupt"),
+};
+
+static struct platform_device ts5500_dio2_pdev = {
+        .name = "ts5500-dio2",
+        .id = -1,
+        .resource = ts5500_dio2_resource,
+        .num_resources = 1,
+};
+
+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:",
+        .brightness_set = ts5500_led_set,
+        .brightness_get = ts5500_led_get,
+};
+
+static int ts5500_adc_convert(u8 ctrl)
+{
+        u8 lsb, msb;
+
+        /* Start conversion (ensure the 3 MSB are set to 0) */
+        outb(ctrl & 0x1f, TS5500_ADC_CONV_INIT_LSB_ADDR);
+
+        /*
+         * The platform has CPLD logic driving the A/D converter.
+         * The conversion must complete within 11 microseconds,
+         * otherwise we have to re-initiate a conversion.
+         */
+        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);
+
+        return (msb << 8) | lsb;
+}
+
+static struct max197_platform_data ts5500_adc_pdata = {
+        .convert = ts5500_adc_convert,
+};
+
+static struct platform_device ts5500_adc_pdev = {
+        .name = "max197",
+        .id = -1,
+        .dev = {
+                .platform_data = &ts5500_adc_pdata,
+        },
+};
+
+static int __init ts5500_init(void)
+{
+        struct platform_device *pdev;
+        struct ts5500_sbc *sbc;
+        int err;
+
+        /*
+         * There is no DMI available or PCI bridge subvendor info,
+         * only the BIOS provides a 16-bit identification call.
+         * It is safer to find a signature in the BIOS shadow RAM.
+         */
+        err = ts5500_check_signature();
+        if (err)
+                return err;
+
+        pdev = platform_device_register_simple("ts5500", -1, NULL, 0);
+        if (IS_ERR(pdev))
+                return PTR_ERR(pdev);
+
+        sbc = devm_kzalloc(&pdev->dev, sizeof(struct ts5500_sbc), GFP_KERNEL);
+        if (!sbc) {
+                err = -ENOMEM;
+                goto error;
+        }
+
+        err = ts5500_detect_config(sbc);
+        if (err)
+                goto error;
+
+        platform_set_drvdata(pdev, sbc);
+
+        err = sysfs_create_group(&pdev->dev.kobj, &ts5500_attr_group);
+        if (err)
+                goto error;
+
+        ts5500_dio1_pdev.dev.parent = &pdev->dev;
+        if (platform_device_register(&ts5500_dio1_pdev))
+                dev_warn(&pdev->dev, "DIO1 block registration failed\n");
+        ts5500_dio2_pdev.dev.parent = &pdev->dev;
+        if (platform_device_register(&ts5500_dio2_pdev))
+                dev_warn(&pdev->dev, "DIO2 block registration failed\n");
+
+        if (led_classdev_register(&pdev->dev, &ts5500_led_cdev))
+                dev_warn(&pdev->dev, "LED registration failed\n");
+
+        if (sbc->adc) {
+                ts5500_adc_pdev.dev.parent = &pdev->dev;
+                if (platform_device_register(&ts5500_adc_pdev))
+                        dev_warn(&pdev->dev, "ADC registration failed\n");
+        }
+
+        return 0;
+error:
+        platform_device_unregister(pdev);
+        return err;
+}
+device_initcall(ts5500_init);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Savoir-faire Linux Inc. <kernel@savoirfairelinux.com>");
+MODULE_DESCRIPTION("Technologic Systems TS-5500 platform driver");