Date:	Wed,  3 Nov 2010 16:21:35 +0200
From:	Baruch Siach <baruch@...s.co.il>
To:	linux-kernel@...r.kernel.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Alex Gershgorin <agersh@...bler.ru>,
	Baruch Siach <baruch@...s.co.il>
Subject: [PATCH] drivers/misc: Altera Cyclone active serial implementation

From: Alex Gershgorin <agersh@...bler.ru>

The active serial protocol can be used to program Altera Cyclone FPGA devices.
This driver uses the kernel gpio interface to implement the active serial
protocol.

Signed-off-by: Alex Gershgorin <agersh@...bler.ru>
Signed-off-by: Baruch Siach <baruch@...s.co.il>
---
 drivers/misc/Kconfig       |   10 ++
 drivers/misc/Makefile      |    1 +
 drivers/misc/cyclone_as.c  |  326 ++++++++++++++++++++++++++++++++++++++++++++
 include/linux/cyclone_as.h |   23 +++
 4 files changed, 360 insertions(+), 0 deletions(-)
 create mode 100644 drivers/misc/cyclone_as.c
 create mode 100644 include/linux/cyclone_as.h

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index b743312..182328e 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -390,6 +390,16 @@ config BMP085
 	  To compile this driver as a module, choose M here: the
 	  module will be called bmp085.
 
+config CYCLONE_AS
+	tristate "Altera Cyclone Active Serial driver"
+	help
+	  Provides support for active serial programming of Altera Cyclone
+	  devices. For the active serial protocol details see the Altera 
+	  "Serial Configuration Devices" document (C51014).
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called cyclone_as.
+
 source "drivers/misc/c2port/Kconfig"
 source "drivers/misc/eeprom/Kconfig"
 source "drivers/misc/cb710/Kconfig"
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 42eab95..a3e0248 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -35,3 +35,4 @@ obj-y				+= eeprom/
 obj-y				+= cb710/
 obj-$(CONFIG_VMWARE_BALLOON)	+= vmw_balloon.o
 obj-$(CONFIG_ARM_CHARLCD)	+= arm-charlcd.o
+obj-$(CONFIG_CYCLONE_AS)	+= cyclone_as.o
diff --git a/drivers/misc/cyclone_as.c b/drivers/misc/cyclone_as.c
new file mode 100644
index 0000000..bfaa60d
--- /dev/null
+++ b/drivers/misc/cyclone_as.c
@@ -0,0 +1,326 @@
+/*
+ * Copyright 2010 Alex Gershgorin, Orex Computed Radiography
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ */
+
+#include <linux/fs.h>
+#include <linux/err.h>
+#include <linux/cdev.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+#include <linux/mutex.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/uaccess.h>
+#include <linux/cyclone_as.h>
+#include <linux/platform_device.h>
+
+/* Active Serial Instruction Set */
+#define AS_WRITE_ENABLE		0x06
+#define AS_WRITE_DISABLE	0x04
+#define AS_READ_STATUS		0x05
+#define AS_WRITE_STATUS		0x01
+#define AS_READ_BYTES		0x03
+#define AS_FAST_READ_BYTES	0x0B
+#define AS_PAGE_PROGRAM		0x02
+#define AS_ERASE_SECTOR		0xD8
+#define AS_ERASE_BULK		0xC7
+#define AS_READ_SILICON_ID	0xAB
+#define AS_CHECK_SILICON_ID	0x9F
+
+#define AS_PAGE_SIZE		256
+
+#define AS_MAX_DEVS		16
+
+#define ASIO_DATA		0
+#define ASIO_NCONFIG		1
+#define ASIO_DCLK		2
+#define ASIO_NCS		3
+#define ASIO_NCE		4
+#define AS_GPIO_NUM		5
+
+#define AS_ALIGNED(x)	IS_ALIGNED(x, AS_PAGE_SIZE)
+
+static struct class *cyclone_as_class;
+static unsigned cyclone_as_major;
+static DECLARE_BITMAP(cyclone_as_devs, AS_MAX_DEVS);
+
+struct cyclone_as_device {
+	struct cdev cdev;
+	struct device *dev;
+	struct mutex open_lock;
+	struct gpio gpios[AS_GPIO_NUM];
+};
+
+static void xmit_byte(struct gpio *gpios, char c, char lsb_first)
+{
+	int i;
+
+	for (i = 0; i < 8; i++) {
+		gpio_set_value(gpios[ASIO_DATA].gpio,
+				lsb_first ? (c >> i) & 1 : (c << i) & 0x80);
+
+		gpio_set_value(gpios[ASIO_DCLK].gpio, 0);
+		ndelay(40);
+		gpio_set_value(gpios[ASIO_DCLK].gpio, 1);
+		ndelay(20);
+	}
+}
+
+static int cyclone_as_open(struct inode *inode, struct file *file)
+{
+	int ret;
+	struct cyclone_as_device *drvdata;
+
+	drvdata = container_of(inode->i_cdev, struct cyclone_as_device, cdev);
+	ret = mutex_trylock(&drvdata->open_lock);
+	if (ret == 0)
+		return -EBUSY;
+
+	file->private_data = drvdata;
+
+	ret = gpio_request_array(drvdata->gpios, ARRAY_SIZE(drvdata->gpios));
+	if (ret < 0) {
+		mutex_unlock(&drvdata->open_lock);
+		return ret;
+	}
+	ndelay(300);
+
+	dev_dbg(drvdata->dev,
+			"data: %d, nconfig: %d, dclk: %d, ncs: %d, nce: %d\n",
+			drvdata->gpios[ASIO_DATA].gpio,
+			drvdata->gpios[ASIO_NCONFIG].gpio,
+			drvdata->gpios[ASIO_DCLK].gpio,
+			drvdata->gpios[ASIO_NCS].gpio,
+			drvdata->gpios[ASIO_NCE].gpio);
+
+	return 0;
+}
+
+static ssize_t cyclone_as_write(struct file *file, const char *buf,
+		size_t count, loff_t *ppos)
+{
+	int	i, ret;
+	u8	*page_buf;
+	ssize_t len = count;
+	struct cyclone_as_device *drvdata = file->private_data;
+	unsigned page_count;
+
+	if (len < 0)
+		return -EFAULT;
+
+	if (len == 0)
+		return 0;
+
+	/* writes must be page aligned */
+	if (!AS_ALIGNED(*ppos) || !AS_ALIGNED(count))
+		return -EINVAL;
+	page_count = *ppos / AS_PAGE_SIZE;
+
+	page_buf = kmalloc(AS_PAGE_SIZE, GFP_KERNEL);
+	if (page_buf == NULL)
+		return -ENOMEM;
+
+	if (*ppos == 0) {
+		gpio_set_value(drvdata->gpios[ASIO_NCS].gpio, 0);
+		xmit_byte(drvdata->gpios, AS_WRITE_ENABLE, 0);
+		gpio_set_value(drvdata->gpios[ASIO_NCS].gpio, 1);
+		ndelay(300);
+
+		gpio_set_value(drvdata->gpios[ASIO_NCS].gpio, 0);
+		xmit_byte(drvdata->gpios, AS_ERASE_BULK, 0);
+		gpio_set_value(drvdata->gpios[ASIO_NCS].gpio, 1);
+		msleep_interruptible(5000);
+	}
+
+	while (len) {
+		dev_dbg(drvdata->dev, "offset = 0x%p\n", buf);
+
+		ret = copy_from_user(page_buf, buf, AS_PAGE_SIZE);
+		if (ret == 0) {
+			buf += AS_PAGE_SIZE;
+			*ppos += AS_PAGE_SIZE;
+			len -= AS_PAGE_SIZE;
+		} else {
+			kfree(page_buf);
+			return -EFAULT;
+		}
+
+		gpio_set_value(drvdata->gpios[ASIO_NCS].gpio, 0);
+		xmit_byte(drvdata->gpios, AS_WRITE_ENABLE, 0);
+		gpio_set_value(drvdata->gpios[ASIO_NCS].gpio, 1);
+		ndelay(300);
+
+		gpio_set_value(drvdata->gpios[ASIO_NCS].gpio, 0);
+		xmit_byte(drvdata->gpios, AS_PAGE_PROGRAM, 0);
+		xmit_byte(drvdata->gpios, (page_count >> 8) & 0xff, 0);
+		xmit_byte(drvdata->gpios, page_count & 0xff, 0);
+		xmit_byte(drvdata->gpios, 0, 0);
+		ndelay(300);
+
+		for (i = 0; i < AS_PAGE_SIZE; i++)
+			xmit_byte(drvdata->gpios, page_buf[i], 1);
+
+		ndelay(300);
+		gpio_set_value(drvdata->gpios[ASIO_NCS].gpio, 1);
+		page_count++;
+		mdelay(5);
+	}
+
+	kfree(page_buf);
+	return count;
+}
+
+static int cyclone_as_release(struct inode *inode, struct file *file)
+{
+	struct cyclone_as_device *drvdata = file->private_data;
+	int i;
+
+	gpio_set_value(drvdata->gpios[ASIO_NCONFIG].gpio, 1);
+	gpio_set_value(drvdata->gpios[ASIO_NCE].gpio, 0);
+	gpio_set_value(drvdata->gpios[ASIO_DCLK].gpio, 0);
+	ndelay(500);
+
+	for (i = 0; i < ARRAY_SIZE(drvdata->gpios); i++)
+		gpio_direction_input(drvdata->gpios[i].gpio);
+	gpio_free_array(drvdata->gpios, ARRAY_SIZE(drvdata->gpios));
+	mutex_unlock(&drvdata->open_lock);
+
+	return 0;
+}
+
+static const struct file_operations cyclone_as_fops = {
+	.open		= cyclone_as_open,
+	.write		= cyclone_as_write,
+	.release	= cyclone_as_release,
+};
+
+static int __init cyclone_as_probe(struct platform_device *pdev)
+{
+	int ret, minor;
+	struct cyclone_as_device *drvdata;
+	struct device *dev;
+	struct cyclone_as_platform_data *pdata = pdev->dev.platform_data;
+
+	drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
+	if (!drvdata)
+		return -ENOMEM;
+
+	drvdata->dev = &pdev->dev;
+
+	cdev_init(&drvdata->cdev, &cyclone_as_fops);
+	drvdata->cdev.owner = THIS_MODULE;
+
+	minor = find_first_zero_bit(cyclone_as_devs, AS_MAX_DEVS);
+	if (minor >= AS_MAX_DEVS)
+		return -EBUSY;
+	ret = cdev_add(&drvdata->cdev, MKDEV(cyclone_as_major, minor), 1);
+	if (ret < 0)
+		return ret;
+	set_bit(minor, cyclone_as_devs);
+
+	dev = device_create(cyclone_as_class, &pdev->dev,
+			MKDEV(cyclone_as_major, minor), drvdata,
+			"%s%d", "cyclone_as", minor);
+	if (IS_ERR(dev)) {
+		ret = PTR_ERR(dev);
+		goto cdev_del;
+	}
+
+	mutex_init(&drvdata->open_lock);
+
+	drvdata->gpios[ASIO_DATA].gpio		= pdata->data;
+	drvdata->gpios[ASIO_DATA].flags		= GPIOF_OUT_INIT_LOW;
+	drvdata->gpios[ASIO_DATA].label		= "as_data";
+	drvdata->gpios[ASIO_NCONFIG].gpio	= pdata->nconfig;
+	drvdata->gpios[ASIO_NCONFIG].flags	= GPIOF_OUT_INIT_LOW;
+	drvdata->gpios[ASIO_NCONFIG].label	= "as_nconfig";
+	drvdata->gpios[ASIO_DCLK].gpio		= pdata->dclk;
+	drvdata->gpios[ASIO_DCLK].flags		= GPIOF_OUT_INIT_LOW;
+	drvdata->gpios[ASIO_DCLK].label		= "as_dclk";
+	drvdata->gpios[ASIO_NCS].gpio		= pdata->ncs;
+	drvdata->gpios[ASIO_NCS].flags		= GPIOF_OUT_INIT_HIGH;
+	drvdata->gpios[ASIO_NCS].label		= "as_ncs";
+	drvdata->gpios[ASIO_NCE].gpio		= pdata->nce;
+	drvdata->gpios[ASIO_NCE].flags		= GPIOF_OUT_INIT_HIGH;
+	drvdata->gpios[ASIO_NCE].label		= "as_nce";
+
+	dev_info(drvdata->dev, "Altera Cyclone Active Serial driver\n");
+
+	return 0;
+
+cdev_del:
+	clear_bit(minor, cyclone_as_devs);
+	cdev_del(&drvdata->cdev);
+	return ret;
+}
+
+static int __devexit cyclone_as_remove(struct platform_device *pdev)
+{
+	struct cyclone_as_device *drvdata = platform_get_drvdata(pdev);
+	int minor = MINOR(drvdata->cdev.dev);
+
+	device_destroy(cyclone_as_class, MKDEV(cyclone_as_major, minor));
+	clear_bit(minor, cyclone_as_devs);
+	cdev_del(&drvdata->cdev);
+
+	return 0;
+}
+
+static struct platform_driver cyclone_as_driver = {
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "cyclone_as",
+	},
+	.remove = __devexit_p(cyclone_as_remove),
+};
+
+int __init cyclone_as_init(void)
+{
+	int err;
+	dev_t dev;
+
+	cyclone_as_class = class_create(THIS_MODULE, "cyclone_as");
+	if (IS_ERR(cyclone_as_class)) {
+		err = PTR_ERR(cyclone_as_class);
+		goto out;
+	}
+
+	err = alloc_chrdev_region(&dev, 0, AS_MAX_DEVS, "cyclone_as");
+	if (err < 0)
+		goto class_destroy;
+	cyclone_as_major = MAJOR(dev);
+
+	err = platform_driver_probe(&cyclone_as_driver, cyclone_as_probe);
+	if (err < 0)
+		goto chr_remove;
+
+	return 0;
+
+chr_remove:
+	unregister_chrdev_region(dev, AS_MAX_DEVS);
+class_destroy:
+	class_destroy(cyclone_as_class);
+out:
+	return err;
+}
+
+void __exit cyclone_as_cleanup(void)
+{
+	platform_driver_unregister(&cyclone_as_driver);
+	unregister_chrdev_region(MKDEV(cyclone_as_major, 0), AS_MAX_DEVS);
+	class_destroy(cyclone_as_class);
+}
+
+module_init(cyclone_as_init);
+module_exit(cyclone_as_cleanup);
+
+MODULE_AUTHOR("Alex Gershgorin <agersh@...bler.ru>");
+MODULE_DESCRIPTION("Altera Cyclone Active Serial driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/cyclone_as.h b/include/linux/cyclone_as.h
new file mode 100644
index 0000000..cf86955
--- /dev/null
+++ b/include/linux/cyclone_as.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright 2010 Alex Gershgorin, Orex Computed Radiography
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ */
+
+#ifndef __ALTERA_PROG_H
+#define __ALTERA_PROG_H
+
+struct cyclone_as_platform_data {
+	unsigned data;
+	unsigned nconfig;
+	unsigned dclk;
+	unsigned ncs;
+	unsigned nce;
+}; 
+
+#endif /* __ALTERA_PROG_H */
-- 
1.7.2.3

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