The Technologic Systems TS-5500 platform provides 3 digital I/O headers:
DIO1, DIO2, and the LCD port, that may be used as a DIO header.
Signed-off-by: Vivien Didelot <vivien.dide...@savoirfairelinux.com>
Signed-off-by: Jerome Oufella <jerome.oufe...@savoirfairelinux.com>
---
drivers/gpio/Kconfig | 8 +
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-ts5500.c | 344 ++++++++++++++++++++++++++++++
include/linux/platform_data/gpio-ts5500.h | 34 +++
4 files changed, 387 insertions(+)
create mode 100644 drivers/gpio/gpio-ts5500.c
create mode 100644 include/linux/platform_data/gpio-ts5500.h
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index ba7926f5..f8bf8e1 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -395,6 +395,14 @@ config GPIO_TPS65912
help
This driver supports TPS65912 gpio chip
+config GPIO_TS5500
+ tristate "TS-5500 DIO Headers"
+ depends on TS5500
+ help
+ This driver supports the 3 Digital I/O headers of the Technologic
+ Systems TS-5500 platform: DIO1, DIO2, and the LCD port which may be
+ used as a DIO header.
+
config GPIO_TWL4030
tristate "TWL4030, TWL5030, and TPS659x0 GPIOs"
depends on TWL4030_CORE
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 153cace..48e8670 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -66,6 +66,7 @@ obj-$(CONFIG_ARCH_DAVINCI_TNETV107X) += gpio-tnetv107x.o
obj-$(CONFIG_GPIO_TPS6586X) += gpio-tps6586x.o
obj-$(CONFIG_GPIO_TPS65910) += gpio-tps65910.o
obj-$(CONFIG_GPIO_TPS65912) += gpio-tps65912.o
+obj-$(CONFIG_GPIO_TS5500) += gpio-ts5500.o
obj-$(CONFIG_GPIO_TWL4030) += gpio-twl4030.o
obj-$(CONFIG_GPIO_UCB1400) += gpio-ucb1400.o
obj-$(CONFIG_GPIO_VR41XX) += gpio-vr41xx.o
diff --git a/drivers/gpio/gpio-ts5500.c b/drivers/gpio/gpio-ts5500.c
new file mode 100644
index 0000000..d91fee9
--- /dev/null
+++ b/drivers/gpio/gpio-ts5500.c
@@ -0,0 +1,344 @@
+/*
+ * GPIO (DIO) driver for Technologic Systems TS-5500
+ *
+ * Copyright (c) 2010-2012 Savoir-faire Linux Inc.
+ * Vivien Didelot <vivien.dide...@savoirfairelinux.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * The TS-5500 platform has 38 Digital Input/Output lines (DIO), exposed by 3
+ * DIO headers: DIO1, DIO2, and the LCD port which may be used as a DIO header.
+ *
+ * The datasheet is available at:
+ * http://embeddedx86.com/documentation/ts-5500-manual.pdf.
+ * See section 6 "Digital I/O" for details about the pinout.
+ */
+
+#include <linux/bitops.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_data/gpio-ts5500.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+/*
+ * This array describes the names of the DIO lines, but also the mapping
between
+ * the datasheet, and corresponding offsets exposed by the driver.
+ */
+static const char * const ts5500_pinout[38] = {
+ /* DIO1 Header (offset 0-13) */
+ [0] = "DIO1_0", /* pin 1 */
+ [1] = "DIO1_1", /* pin 3 */
+ [2] = "DIO1_2", /* pin 5 */
+ [3] = "DIO1_3", /* pin 7 */
+ [4] = "DIO1_4", /* pin 9 */
+ [5] = "DIO1_5", /* pin 11 */
+ [6] = "DIO1_6", /* pin 13 */
+ [7] = "DIO1_7", /* pin 15 */
+ [8] = "DIO1_8", /* pin 4 */
+ [9] = "DIO1_9", /* pin 6 */
+ [10] = "DIO1_10", /* pin 8 */
+ [11] = "DIO1_11", /* pin 10 */
+ [12] = "DIO1_12", /* pin 12 */
+ [13] = "DIO1_13", /* pin 14 */
+
+ /* DIO2 Header (offset 14-26) */
+ [14] = "DIO2_0", /* pin 1 */
+ [15] = "DIO2_1", /* pin 3 */
+ [16] = "DIO2_2", /* pin 5 */
+ [17] = "DIO2_3", /* pin 7 */
+ [18] = "DIO2_4", /* pin 9 */
+ [19] = "DIO2_5", /* pin 11 */
+ [20] = "DIO2_6", /* pin 13 */
+ [21] = "DIO2_7", /* pin 15 */
+ [22] = "DIO2_8", /* pin 4 */
+ [23] = "DIO2_9", /* pin 6 */
+ [24] = "DIO2_10", /* pin 8 */
+ [25] = "DIO2_11", /* pin 10 */
+ [26] = "DIO2_13", /* pin 14 */
+
+ /* LCD Port as DIO (offset 27-37) */
+ [27] = "LCD_0", /* pin 8 */
+ [28] = "LCD_1", /* pin 7 */
+ [29] = "LCD_2", /* pin 10 */
+ [30] = "LCD_3", /* pin 9 */
+ [31] = "LCD_4", /* pin 12 */
+ [32] = "LCD_5", /* pin 11 */
+ [33] = "LCD_6", /* pin 14 */
+ [34] = "LCD_7", /* pin 13 */
+ [35] = "LCD_EN", /* pin 5 */
+ [36] = "LCD_WR", /* pin 6 */
+ [37] = "LCD_RS", /* pin 3 */
+};
+
+#define IN (1 << 0)
+#define OUT (1 << 1)
+#ifndef NO_IRQ
+#define NO_IRQ -1
+#endif
+
+/*
+ * This structure is used to describe capabilities of DIO lines,
+ * such as available directions, and mapped IRQ (if any).
+ */
+struct ts5500_dio {
+ const unsigned long value_addr;
+ const int value_bit;
+ const unsigned long control_addr;
+ const int control_bit;
+ const int irq;
+ const int direction;
+};
+
+static const struct ts5500_dio ts5500_dios[] = {
+ /* DIO1 Header (offset 0-13) */
+ [0] = { 0x7b, 0, 0x7a, 0, NO_IRQ, IN | OUT },
+ [1] = { 0x7b, 1, 0x7a, 0, NO_IRQ, IN | OUT },
+ [2] = { 0x7b, 2, 0x7a, 0, NO_IRQ, IN | OUT },
+ [3] = { 0x7b, 3, 0x7a, 0, NO_IRQ, IN | OUT },
+ [4] = { 0x7b, 4, 0x7a, 1, NO_IRQ, IN | OUT },
+ [5] = { 0x7b, 5, 0x7a, 1, NO_IRQ, IN | OUT },
+ [6] = { 0x7b, 6, 0x7a, 1, NO_IRQ, IN | OUT },
+ [7] = { 0x7b, 7, 0x7a, 1, NO_IRQ, IN | OUT },
+ [8] = { 0x7c, 0, 0x7a, 5, NO_IRQ, IN | OUT },
+ [9] = { 0x7c, 1, 0x7a, 5, NO_IRQ, IN | OUT },
+ [10] = { 0x7c, 2, 0x7a, 5, NO_IRQ, IN | OUT },
+ [11] = { 0x7c, 3, 0x7a, 5, NO_IRQ, IN | OUT },
+ [12] = { 0x7c, 4, 0, -1, NO_IRQ, IN },
+ [13] = { 0x7c, 5, 0, -1, 7, IN },
+
+ /* DIO2 Header (offset 14-26) */
+ [14] = { 0x7e, 0, 0x7d, 0, NO_IRQ, IN | OUT },
+ [15] = { 0x7e, 1, 0x7d, 0, NO_IRQ, IN | OUT },
+ [16] = { 0x7e, 2, 0x7d, 0, NO_IRQ, IN | OUT },
+ [17] = { 0x7e, 3, 0x7d, 0, NO_IRQ, IN | OUT },
+ [18] = { 0x7e, 4, 0x7d, 1, NO_IRQ, IN | OUT },
+ [19] = { 0x7e, 5, 0x7d, 1, NO_IRQ, IN | OUT },
+ [20] = { 0x7e, 6, 0x7d, 1, NO_IRQ, IN | OUT },
+ [21] = { 0x7e, 7, 0x7d, 1, NO_IRQ, IN | OUT },
+ [22] = { 0x7f, 0, 0x7d, 5, NO_IRQ, IN | OUT },
+ [23] = { 0x7f, 1, 0x7d, 5, NO_IRQ, IN | OUT },
+ [24] = { 0x7f, 2, 0x7d, 5, NO_IRQ, IN | OUT },
+ [25] = { 0x7f, 3, 0x7d, 5, NO_IRQ, IN | OUT },
+ [26] = { 0x7f, 4, 0, -1, 6, IN },
+
+ /* LCD Port as DIO (offset 27-37) */
+ [27] = { 0x72, 0, 0x7d, 2, NO_IRQ, IN | OUT },
+ [28] = { 0x72, 1, 0x7d, 2, NO_IRQ, IN | OUT },
+ [29] = { 0x72, 2, 0x7d, 2, NO_IRQ, IN | OUT },
+ [30] = { 0x72, 3, 0x7d, 2, NO_IRQ, IN | OUT },
+ [31] = { 0x72, 4, 0x7d, 3, NO_IRQ, IN | OUT },
+ [32] = { 0x72, 5, 0x7d, 3, NO_IRQ, IN | OUT },
+ [33] = { 0x72, 6, 0x7d, 3, NO_IRQ, IN | OUT },
+ [34] = { 0x72, 7, 0x7d, 3, NO_IRQ, IN | OUT },
+ [35] = { 0x73, 0, 0, -1, NO_IRQ, OUT },
+ [36] = { 0x73, 6, 0, -1, NO_IRQ, IN },
+ [37] = { 0x73, 7, 0, -1, 1, IN },
+};
+
+static bool lcd_dio;
+static bool lcd_irq;
+static bool dio1_irq;
+static bool dio2_irq;
+
+static DEFINE_SPINLOCK(lock);
+
+static inline void io_set_bit(int bit, unsigned long addr)
+{
+ unsigned long val = inb(addr);
+ __set_bit(bit, &val);
+ outb(val, addr);
+}
+
+static inline void io_clear_bit(int bit, unsigned long addr)
+{
+ unsigned long val = inb(addr);
+ __clear_bit(bit, &val);
+ outb(val, addr);
+}
+
+static int ts5500_gpio_input(struct gpio_chip *chip, unsigned offset)
+{
+ unsigned long flags;
+ const struct ts5500_dio line = ts5500_dios[offset];
+
+ /* Some lines cannot be configured as input */
+ if (!(line.direction & IN))
+ return -ENXIO;
+
+ /* Some others are input only */
+ if (line.direction & OUT) {
+ spin_lock_irqsave(&lock, flags);
+ io_clear_bit(line.control_bit, line.control_addr);
+ spin_unlock_irqrestore(&lock, flags);
+ }
+
+ return 0;
+}
+
+static int ts5500_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ const struct ts5500_dio line = ts5500_dios[offset];
+
+ return (inb(line.value_addr) >> line.value_bit) & 1;
+}
+
+static int ts5500_gpio_output(struct gpio_chip *chip, unsigned offset, int val)
+{
+ unsigned long flags;
+ const struct ts5500_dio line = ts5500_dios[offset];
+
+ /* Some lines cannot be configured as output */
+ if (!(line.direction & OUT))
+ return -ENXIO;
+
+ spin_lock_irqsave(&lock, flags);
+ /* Some lines are output only */
+ if (line.direction & IN)
+ io_set_bit(line.control_bit, line.control_addr);
+
+ if (val)
+ io_set_bit(line.value_bit, line.value_addr);
+ else
+ io_clear_bit(line.value_bit, line.value_addr);
+ spin_unlock_irqrestore(&lock, flags);
+
+ return 0;
+}
+
+static void ts5500_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
+{
+ unsigned long flags;
+ const struct ts5500_dio line = ts5500_dios[offset];
+
+ spin_lock_irqsave(&lock, flags);
+ if (val)
+ io_set_bit(line.value_bit, line.value_addr);
+ else
+ io_clear_bit(line.value_bit, line.value_addr);
+ spin_unlock_irqrestore(&lock, flags);
+}
+
+static int ts5500_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+ const struct ts5500_dio line = ts5500_dios[offset];
+
+ /* Only a few lines are IRQ-capable */
+ if (line.irq != NO_IRQ)
+ return line.irq;
+
+ /* This allows to bridge a line with the IRQ line of the same header */
+ if (dio1_irq && offset < 13)
+ return ts5500_dios[13].irq;
+ if (dio2_irq && offset > 13 && offset < 26)
+ return ts5500_dios[26].irq;
+ if (lcd_irq && offset > 26 && offset < 37)
+ return ts5500_dios[37].irq;
+
+ return -ENXIO;
+}
+
+static struct gpio_chip ts5500_gc = {
+ .label = "TS-5500 DIO Headers",
+ .owner = THIS_MODULE,
+ .direction_input = ts5500_gpio_input,
+ .get = ts5500_gpio_get,
+ .direction_output = ts5500_gpio_output,
+ .set = ts5500_gpio_set,
+ .to_irq = ts5500_gpio_to_irq,
+ .names = ts5500_pinout,
+ .ngpio = 27,
+ .base = -1,
+};
+
+static int __devinit ts5500_gpio_probe(struct platform_device *pdev)
+{
+ int ret;
+ unsigned long flags;
+ struct ts5500_gpio_platform_data *pdata = pdev->dev.platform_data;
+
+ if (pdata) {
+ ts5500_gc.base = pdata->base;
+ dio1_irq = pdata->dio1_irq;
+ dio2_irq = pdata->dio2_irq;
+ if (pdata->lcd_dio) {
+ lcd_dio = true;
+ lcd_irq = pdata->lcd_irq;
+ ts5500_gc.ngpio = 38;
+ }
+ }
+
+ if (!devm_request_region(&pdev->dev, 0x7a, 3, "DIO1 Header")) {
+ dev_err(&pdev->dev, "failed to request DIO1 ports (0x7a-7c)\n");
+ return -EBUSY;
+ }
+
+ if (!devm_request_region(&pdev->dev, 0x7d, 3, "DIO2 Header")) {
+ dev_err(&pdev->dev, "failed to request DIO2 ports (0x7d-7f)\n");
+ return -EBUSY;
+ }
+
+ if (lcd_dio &&
+ !devm_request_region(&pdev->dev, 0x72, 2, "LCD Port as DIO")) {
+ dev_err(&pdev->dev, "failed to request LCD ports (0x72-73)\n");
+ return -EBUSY;
+ }
+
+ platform_set_drvdata(pdev, &ts5500_gc);
+
+ ret = gpiochip_add(&ts5500_gc);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register the gpio chip\n");
+ return ret;
+ }
+
+ /* Enable IRQ generation */
+ spin_lock_irqsave(&lock, flags);
+ io_set_bit(7, 0x7a); /* DIO1_13 on IRQ7 */
+ io_set_bit(7, 0x7d); /* DIO2_13 on IRQ6 */
+ if (lcd_dio) {
+ io_clear_bit(4, 0x7d); /* LCD Header usage as DIO */
+ io_set_bit(6, 0x7d); /* LCD_RS on IRQ1 */
+ }
+ spin_unlock_irqrestore(&lock, flags);
+
+ return 0;
+}
+
+static int __devexit ts5500_gpio_remove(struct platform_device *pdev)
+{
+ int ret;
+ unsigned long flags;
+
+ /* Disable IRQ generation */
+ spin_lock_irqsave(&lock, flags);
+ io_clear_bit(7, 0x7a);
+ io_clear_bit(7, 0x7d);
+ if (lcd_dio)
+ io_clear_bit(6, 0x7d);
+ spin_unlock_irqrestore(&lock, flags);
+
+ ret = gpiochip_remove(&ts5500_gc);
+ if (ret)
+ dev_err(&pdev->dev, "failed to remove the gpio chip\n");
+
+ return ret;
+}
+
+static struct platform_driver ts5500_gpio_driver = {
+ .driver = {
+ .name = "gpio-ts5500",
+ .owner = THIS_MODULE,
+ },
+ .probe = ts5500_gpio_probe,
+ .remove = __devexit_p(ts5500_gpio_remove),
+};
+
+module_platform_driver(ts5500_gpio_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Savoir-faire Linux Inc. <ker...@savoirfairelinux.com>");
+MODULE_DESCRIPTION("Technologic Systems TS-5500 Digital I/O driver");
diff --git a/include/linux/platform_data/gpio-ts5500.h
b/include/linux/platform_data/gpio-ts5500.h
new file mode 100644
index 0000000..9efd4c3
--- /dev/null
+++ b/include/linux/platform_data/gpio-ts5500.h
@@ -0,0 +1,34 @@
+/*
+ * GPIO (DIO) header for Technologic Systems TS-5500
+ *
+ * Copyright (c) 2012 Savoir-faire Linux Inc.
+ * Vivien Didelot <vivien.dide...@savoirfairelinux.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * The TS-5500 board has 38 Digital Input/Output lines, referred to as DIO in
+ * the product's literature. See section 6 "Digital I/O" of the datasheet:
+ * http://embeddedx86.com/documentation/ts-5500-manual.pdf
+ *
+ * As each IRQable line is input only, the platform data has an option for each
+ * header to return the corresponding IRQ line on request. This might be useful
+ * to bind a bidirectional line with the IRQ line of the same header.
+ */
+
+/**
+ * struct ts5500_gpio_platform_data - TS-5500 GPIO configuration
+ * @base: The GPIO base number to use.
+ * @lcd_dio: Use the LCD port as 11 additional digital I/O lines.
+ * @lcd_irq: Return IRQ1 for every line of LCD DIO header.
+ * @dio1_irq: Return IRQ7 for every line of DIO1 header.
+ * @dio2_irq: Return IRQ6 for every line of DIO2 header.
+ */
+struct ts5500_gpio_platform_data {
+ int base;
+ bool lcd_dio;
+ bool lcd_irq;
+ bool dio1_irq;
+ bool dio2_irq;
+};
--
1.7.11.4
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