/*
* 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");