path: root/target/linux/zynq/patches/113-add-xilinx-devcfg-char-node.patch

--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -387,6 +387,13 @@ config XILINX_HWICAP
 
 	  If unsure, say N.
 
+config XILINX_DEVCFG
+	tristate "Xilinx Device Configuration"
+	depends on ARCH_ZYNQ
+	help
+	  This option enables support for the Xilinx device configuration driver.
+	  If unsure, say N
+
 config R3964
 	tristate "Siemens R3964 line discipline"
 	depends on TTY
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_GEN_RTC)		+= genrtc.o
 obj-$(CONFIG_EFI_RTC)		+= efirtc.o
 obj-$(CONFIG_DS1302)		+= ds1302.o
 obj-$(CONFIG_XILINX_HWICAP)	+= xilinx_hwicap/
+obj-$(CONFIG_XILINX_DEVCFG)	+= xilinx_devcfg.o
 ifeq ($(CONFIG_GENERIC_NVRAM),y)
   obj-$(CONFIG_NVRAM)	+= generic_nvram.o
 else
--- /dev/null
+++ b/drivers/char/xilinx_devcfg.c
@@ -0,0 +1,2105 @@
+/*
+ * Xilinx Zynq Device Config driver
+ *
+ * Copyright (c) 2011 - 2013 Xilinx Inc.
+ *
+ * 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.
+ */
+
+#include <linux/cdev.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/sysctl.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+
+extern void zynq_slcr_init_preload_fpga(void);
+extern void zynq_slcr_init_postload_fpga(void);
+
+#define DRIVER_NAME "xdevcfg"
+#define XDEVCFG_DEVICES 1
+
+/* An array, which is set to true when the device is registered. */
+static DEFINE_MUTEX(xdevcfg_mutex);
+
+/* Constant Definitions */
+#define XDCFG_CTRL_OFFSET		0x00 /* Control Register */
+#define XDCFG_LOCK_OFFSET		0x04 /* Lock Register */
+#define XDCFG_INT_STS_OFFSET		0x0C /* Interrupt Status Register */
+#define XDCFG_INT_MASK_OFFSET		0x10 /* Interrupt Mask Register */
+#define XDCFG_STATUS_OFFSET		0x14 /* Status Register */
+#define XDCFG_DMA_SRC_ADDR_OFFSET	0x18 /* DMA Source Address Register */
+#define XDCFG_DMA_DEST_ADDR_OFFSET	0x1C /* DMA Destination Address Reg */
+#define XDCFG_DMA_SRC_LEN_OFFSET	0x20 /* DMA Source Transfer Length */
+#define XDCFG_DMA_DEST_LEN_OFFSET	0x24 /* DMA Destination Transfer */
+#define XDCFG_UNLOCK_OFFSET		0x34 /* Unlock Register */
+#define XDCFG_MCTRL_OFFSET		0x80 /* Misc. Control Register */
+
+/* Control Register Bit definitions */
+#define XDCFG_CTRL_PCFG_PROG_B_MASK	0x40000000 /* Program signal to
+						    *  Reset FPGA */
+#define XDCFG_CTRL_PCAP_PR_MASK		0x08000000 /* Enable PCAP for PR */
+#define XDCFG_CTRL_PCAP_MODE_MASK	0x04000000 /* Enable PCAP */
+#define XDCFG_CTRL_PCAP_RATE_EN_MASK  0x02000000 /* Enable PCAP Quad Rate */
+#define XDCFG_CTRL_PCFG_AES_EN_MASK	0x00000E00 /* AES Enable Mask */
+#define XDCFG_CTRL_SEU_EN_MASK		0x00000100 /* SEU Enable Mask */
+#define XDCFG_CTRL_SPNIDEN_MASK		0x00000040 /* Secure Non Invasive
+						    *  Debug Enable */
+#define XDCFG_CTRL_SPIDEN_MASK		0x00000020 /* Secure Invasive
+						    *  Debug Enable */
+#define XDCFG_CTRL_NIDEN_MASK		0x00000010 /* Non-Invasive Debug
+						    *  Enable */
+#define XDCFG_CTRL_DBGEN_MASK		0x00000008 /* Invasive Debug
+						    *  Enable */
+#define XDCFG_CTRL_DAP_EN_MASK		0x00000007 /* DAP Enable Mask */
+
+/* Lock register bit definitions */
+
+#define XDCFG_LOCK_AES_EN_MASK		0x00000008 /* Lock AES_EN update */
+#define XDCFG_LOCK_SEU_MASK		0x00000004 /* Lock SEU_En update */
+#define XDCFG_LOCK_DBG_MASK		0x00000001 /* This bit locks
+						    *  security config
+						    *  including: DAP_En,
+						    *  DBGEN,NIDEN, SPNIEN */
+
+/* Miscellaneous Control Register bit definitions */
+#define XDCFG_MCTRL_PCAP_LPBK_MASK	0x00000010 /* Internal PCAP loopback */
+
+/* Status register bit definitions */
+#define XDCFG_STATUS_PCFG_INIT_MASK	0x00000010 /* FPGA init status */
+
+/* Interrupt Status/Mask Register Bit definitions */
+#define XDCFG_IXR_DMA_DONE_MASK		0x00002000 /* DMA Command Done */
+#define XDCFG_IXR_D_P_DONE_MASK		0x00001000 /* DMA and PCAP Cmd Done */
+#define XDCFG_IXR_PCFG_DONE_MASK	0x00000004 /* FPGA programmed */
+#define XDCFG_IXR_ERROR_FLAGS_MASK	0x00F0F860
+#define XDCFG_IXR_ALL_MASK		0xF8F7F87F
+/* Miscellaneous constant values */
+#define XDCFG_DMA_INVALID_ADDRESS	0xFFFFFFFF  /* Invalid DMA address */
+
+static const char * const fclk_name[] = {
+	"fclk0",
+	"fclk1",
+	"fclk2",
+	"fclk3"
+};
+#define NUMFCLKS ARRAY_SIZE(fclk_name)
+
+/**
+ * struct xdevcfg_drvdata - Device Configuration driver structure
+ *
+ * @dev: Pointer to the device structure
+ * @cdev: Instance of the cdev structure
+ * @devt: Pointer to the dev_t structure
+ * @class: Pointer to device class
+ * @fclk_class: Pointer to fclk device class
+ * @dma_done: The dma_done status bit for the DMA command completion
+ * @error_status: The error status captured during the DMA transfer
+ * @irq: Interrupt number
+ * @clk: Peripheral clock for devcfg
+ * @fclk: Array holding references to the FPGA clocks
+ * @fclk_exported: Flag inidcating whether an FPGA clock is exported
+ * @is_open: The status bit to indicate whether the device is opened
+ * @sem: Instance for the mutex
+ * @lock: Instance of spinlock
+ * @base_address: The virtual device base address of the device registers
+ * @is_partial_bitstream: Status bit to indicate partial/full bitstream
+ */
+struct xdevcfg_drvdata {
+	struct device *dev;
+	struct cdev cdev;
+	dev_t devt;
+	struct class *class;
+	struct class *fclk_class;
+	int irq;
+	struct clk *clk;
+	struct clk *fclk[NUMFCLKS];
+	u8 fclk_exported[NUMFCLKS];
+	volatile bool dma_done;
+	volatile int error_status;
+	bool is_open;
+	struct mutex sem;
+	spinlock_t lock;
+	void __iomem *base_address;
+	int ep107;
+	bool is_partial_bitstream;
+	bool endian_swap;
+	char residue_buf[3];
+	int residue_len;
+};
+
+/**
+ * struct fclk_data - FPGA clock data
+ * @clk: Pointer to clock
+ * @enable: Flag indicating enable status of the clock
+ * @rate_rnd: Rate to be rounded for round rate operation
+ */
+struct fclk_data {
+	struct clk *clk;
+	int enabled;
+	unsigned long rate_rnd;
+};
+
+/* Register read/write access routines */
+#define xdevcfg_writereg(offset, val)	__raw_writel(val, offset)
+#define xdevcfg_readreg(offset)		__raw_readl(offset)
+
+/**
+ * xdevcfg_reset_pl() - Reset the programmable logic.
+ * @base_address:	The base address of the device.
+ *
+ * Must be called with PCAP clock enabled
+ */
+static void xdevcfg_reset_pl(void __iomem *base_address)
+{
+	/*
+	 * Create a rising edge on PCFG_INIT. PCFG_INIT follows PCFG_PROG_B,
+	 * so we need to * poll it after setting PCFG_PROG_B to make sure that
+	 * the rising edge happens.
+	 */
+	xdevcfg_writereg(base_address + XDCFG_CTRL_OFFSET,
+			(xdevcfg_readreg(base_address + XDCFG_CTRL_OFFSET) |
+			 XDCFG_CTRL_PCFG_PROG_B_MASK));
+	while (!(xdevcfg_readreg(base_address + XDCFG_STATUS_OFFSET) &
+				XDCFG_STATUS_PCFG_INIT_MASK))
+		;
+
+	xdevcfg_writereg(base_address + XDCFG_CTRL_OFFSET,
+			(xdevcfg_readreg(base_address + XDCFG_CTRL_OFFSET) &
+			 ~XDCFG_CTRL_PCFG_PROG_B_MASK));
+	while (xdevcfg_readreg(base_address + XDCFG_STATUS_OFFSET) &
+			XDCFG_STATUS_PCFG_INIT_MASK)
+		;
+
+	msleep(5);
+	xdevcfg_writereg(base_address + XDCFG_CTRL_OFFSET,
+			(xdevcfg_readreg(base_address + XDCFG_CTRL_OFFSET) |
+			 XDCFG_CTRL_PCFG_PROG_B_MASK));
+	while (!(xdevcfg_readreg(base_address + XDCFG_STATUS_OFFSET) &
+				XDCFG_STATUS_PCFG_INIT_MASK))
+		;
+}
+
+/**
+ * xdevcfg_irq() - The main interrupt handler.
+ * @irq:	The interrupt number.
+ * @data:	Pointer to the driver data structure.
+ * returns: IRQ_HANDLED after the interrupt is handled.
+ **/
+static irqreturn_t xdevcfg_irq(int irq, void *data)
+{
+	u32 intr_status;
+	struct xdevcfg_drvdata *drvdata = data;
+
+	spin_lock(&drvdata->lock);
+
+	intr_status = xdevcfg_readreg(drvdata->base_address +
+					XDCFG_INT_STS_OFFSET);
+
+	/* Clear the interrupts */
+	xdevcfg_writereg(drvdata->base_address + XDCFG_INT_STS_OFFSET,
+				intr_status);
+
+	if ((intr_status & XDCFG_IXR_D_P_DONE_MASK) ==
+				XDCFG_IXR_D_P_DONE_MASK)
+		drvdata->dma_done = 1;
+
+	if ((intr_status & XDCFG_IXR_ERROR_FLAGS_MASK) ==
+			XDCFG_IXR_ERROR_FLAGS_MASK)
+		drvdata->error_status = 1;
+
+	spin_unlock(&drvdata->lock);
+
+	return IRQ_HANDLED;
+}
+
+/**
+ * xdevcfg_write() - The is the driver write function.
+ *
+ * @file:	Pointer to the file structure.
+ * @buf:	Pointer to the bitstream location.
+ * @count:	The number of bytes to be written.
+ * @ppos:	Pointer to the offset value
+ * returns:	Success or error status.
+ **/
+static ssize_t
+xdevcfg_write(struct file *file, const char __user *buf, size_t count,
+		loff_t *ppos)
+{
+	char *kbuf;
+	int status;
+	unsigned long timeout;
+	u32 intr_reg, dma_len;
+	dma_addr_t dma_addr;
+	u32 transfer_length = 0;
+	struct xdevcfg_drvdata *drvdata = file->private_data;
+	size_t user_count = count;
+	int i;
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	status = mutex_lock_interruptible(&drvdata->sem);
+
+	if (status)
+		goto err_clk;
+
+	dma_len = count + drvdata->residue_len;
+	kbuf = dma_alloc_coherent(drvdata->dev, dma_len, &dma_addr, GFP_KERNEL);
+	if (!kbuf) {
+		status = -ENOMEM;
+		goto err_unlock;
+	}
+
+	/* Collect stragglers from last time (0 to 3 bytes) */
+	memcpy(kbuf, drvdata->residue_buf, drvdata->residue_len);
+
+	/* Fetch user data, appending to stragglers */
+	if (copy_from_user(kbuf + drvdata->residue_len, buf, count)) {
+		status = -EFAULT;
+		goto error;
+	}
+
+	/* Include stragglers in total bytes to be handled */
+	count += drvdata->residue_len;
+
+	/* First block contains a header */
+	if (*ppos == 0 && count > 4) {
+		/* Look for sync word */
+		for (i = 0; i < count - 4; i++) {
+			if (memcmp(kbuf + i, "\x66\x55\x99\xAA", 4) == 0) {
+				pr_debug("Found normal sync word\n");
+				drvdata->endian_swap = 0;
+				break;
+			}
+			if (memcmp(kbuf + i, "\xAA\x99\x55\x66", 4) == 0) {
+				pr_debug("Found swapped sync word\n");
+				drvdata->endian_swap = 1;
+				break;
+			}
+		}
+		/* Remove the header, aligning the data on word boundary */
+		if (i != count - 4) {
+			count -= i;
+			memmove(kbuf, kbuf + i, count);
+		}
+	}
+
+	/* Save stragglers for next time */
+	drvdata->residue_len = count % 4;
+	count -= drvdata->residue_len;
+	memcpy(drvdata->residue_buf, kbuf + count, drvdata->residue_len);
+
+	/* Fixup endianess of the data */
+	if (drvdata->endian_swap) {
+		for (i = 0; i < count; i += 4) {
+			u32 *p = (u32 *)&kbuf[i];
+			*p = swab32(*p);
+		}
+	}
+
+	/* Enable DMA and error interrupts */
+	xdevcfg_writereg(drvdata->base_address + XDCFG_INT_STS_OFFSET,
+				XDCFG_IXR_ALL_MASK);
+
+
+	xdevcfg_writereg(drvdata->base_address + XDCFG_INT_MASK_OFFSET,
+				(u32) (~(XDCFG_IXR_D_P_DONE_MASK |
+				XDCFG_IXR_ERROR_FLAGS_MASK)));
+
+	drvdata->dma_done = 0;
+	drvdata->error_status = 0;
+
+	/* Initiate DMA write command */
+	if (count < 0x1000)
+		xdevcfg_writereg(drvdata->base_address +
+			XDCFG_DMA_SRC_ADDR_OFFSET, (u32)(dma_addr + 1));
+	else
+		xdevcfg_writereg(drvdata->base_address +
+			XDCFG_DMA_SRC_ADDR_OFFSET, (u32) dma_addr);
+
+	xdevcfg_writereg(drvdata->base_address + XDCFG_DMA_DEST_ADDR_OFFSET,
+				(u32)XDCFG_DMA_INVALID_ADDRESS);
+	/* Convert number of bytes to number of words.  */
+	if (count % 4)
+		transfer_length	= (count / 4 + 1);
+	else
+		transfer_length	= count / 4;
+	xdevcfg_writereg(drvdata->base_address + XDCFG_DMA_SRC_LEN_OFFSET,
+				transfer_length);
+	xdevcfg_writereg(drvdata->base_address + XDCFG_DMA_DEST_LEN_OFFSET, 0);
+
+	timeout = jiffies + msecs_to_jiffies(1000);
+
+	while (!drvdata->dma_done) {
+		if (time_after(jiffies, timeout)) {
+				status = -ETIMEDOUT;
+				goto error;
+		}
+	}
+
+	if (drvdata->error_status)
+		status = drvdata->error_status;
+
+	/* Disable the DMA and error interrupts */
+	intr_reg = xdevcfg_readreg(drvdata->base_address +
+					XDCFG_INT_MASK_OFFSET);
+	xdevcfg_writereg(drvdata->base_address + XDCFG_INT_MASK_OFFSET,
+				intr_reg | (XDCFG_IXR_D_P_DONE_MASK |
+				XDCFG_IXR_ERROR_FLAGS_MASK));
+
+	/* If we didn't write correctly, then bail out. */
+	if (status) {
+		status = -EFAULT;
+		goto error;
+	}
+
+	*ppos += user_count;
+	status = user_count;
+
+error:
+	dma_free_coherent(drvdata->dev, dma_len, kbuf, dma_addr);
+err_unlock:
+	mutex_unlock(&drvdata->sem);
+err_clk:
+	clk_disable(drvdata->clk);
+	return status;
+}
+
+
+/**
+ * xdevcfg_read() - The is the driver read function.
+ * @file:	Pointer to the file structure.
+ * @buf:	Pointer to the bitstream location.
+ * @count:	The number of bytes read.
+ * @ppos:	Pointer to the offsetvalue
+ * returns:	Success or error status.
+ */
+static ssize_t
+xdevcfg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
+{
+	u32 *kbuf;
+	int status;
+	unsigned long timeout;
+	dma_addr_t dma_addr;
+	struct xdevcfg_drvdata *drvdata = file->private_data;
+	u32 intr_reg;
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	status = mutex_lock_interruptible(&drvdata->sem);
+	if (status)
+		goto err_clk;
+
+	/* Get new data from the ICAP, and return was requested. */
+	kbuf = dma_alloc_coherent(drvdata->dev, count, &dma_addr, GFP_KERNEL);
+	if (!kbuf) {
+		status = -ENOMEM;
+		goto err_unlock;
+	}
+
+	drvdata->dma_done = 0;
+	drvdata->error_status = 0;
+
+	/* Enable DMA and error interrupts */
+	xdevcfg_writereg(drvdata->base_address + XDCFG_INT_STS_OFFSET,
+				XDCFG_IXR_ALL_MASK);
+
+	xdevcfg_writereg(drvdata->base_address + XDCFG_INT_MASK_OFFSET,
+				(u32) (~(XDCFG_IXR_D_P_DONE_MASK |
+				XDCFG_IXR_ERROR_FLAGS_MASK)));
+	/* Initiate DMA read command */
+	xdevcfg_writereg(drvdata->base_address + XDCFG_DMA_SRC_ADDR_OFFSET,
+				(u32)XDCFG_DMA_INVALID_ADDRESS);
+	xdevcfg_writereg(drvdata->base_address + XDCFG_DMA_DEST_ADDR_OFFSET,
+				(u32)dma_addr);
+	xdevcfg_writereg(drvdata->base_address + XDCFG_DMA_SRC_LEN_OFFSET, 0);
+	xdevcfg_writereg(drvdata->base_address + XDCFG_DMA_DEST_LEN_OFFSET,
+				count / 4);
+
+	timeout = jiffies + msecs_to_jiffies(1000);
+
+	while (!drvdata->dma_done) {
+		if (time_after(jiffies, timeout)) {
+			status = -ETIMEDOUT;
+			goto error;
+		}
+	}
+
+	if (drvdata->error_status)
+		status = drvdata->error_status;
+
+	/* Disable and clear DMA and error interrupts */
+	intr_reg = xdevcfg_readreg(drvdata->base_address +
+					XDCFG_INT_MASK_OFFSET);
+	xdevcfg_writereg(drvdata->base_address + XDCFG_INT_MASK_OFFSET,
+				intr_reg | (XDCFG_IXR_D_P_DONE_MASK |
+				XDCFG_IXR_ERROR_FLAGS_MASK));
+
+
+	/* If we didn't read correctly, then bail out. */
+	if (status) {
+		status = -EFAULT;
+		goto error;
+	}
+
+	/* If we fail to return the data to the user, then bail out. */
+	if (copy_to_user(buf, kbuf, count)) {
+		status = -EFAULT;
+		goto error;
+	}
+
+	status = count;
+error:
+	dma_free_coherent(drvdata->dev, count, kbuf, dma_addr);
+err_unlock:
+	mutex_unlock(&drvdata->sem);
+err_clk:
+	clk_disable(drvdata->clk);
+
+	return status;
+}
+
+static void xdevcfg_enable_partial(struct xdevcfg_drvdata *drvdata)
+{
+	u32 reg = xdevcfg_readreg(drvdata->base_address + XDCFG_CTRL_OFFSET);
+
+	xdevcfg_writereg(drvdata->base_address + XDCFG_CTRL_OFFSET,
+			 reg | XDCFG_CTRL_PCAP_PR_MASK);
+}
+
+static void xdevcfg_disable_partial(struct xdevcfg_drvdata *drvdata)
+{
+	u32 reg = xdevcfg_readreg(drvdata->base_address + XDCFG_CTRL_OFFSET);
+
+	xdevcfg_writereg(drvdata->base_address + XDCFG_CTRL_OFFSET,
+			 reg & ~XDCFG_CTRL_PCAP_PR_MASK);
+}
+
+/**
+ * xdevcfg_open() - The is the driver open function.
+ * @inode:	Pointer to the inode structure of this device.
+ * @file:	Pointer to the file structure.
+ * returns:	Success or error status.
+ */
+static int xdevcfg_open(struct inode *inode, struct file *file)
+{
+	struct xdevcfg_drvdata *drvdata;
+	int status;
+
+	drvdata = container_of(inode->i_cdev, struct xdevcfg_drvdata, cdev);
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	status = mutex_lock_interruptible(&drvdata->sem);
+	if (status)
+		goto err_clk;
+
+	if (drvdata->is_open) {
+		status = -EBUSY;
+		goto error;
+	}
+
+	file->private_data = drvdata;
+	drvdata->is_open = 1;
+	drvdata->endian_swap = 0;
+	drvdata->residue_len= 0;
+
+	/*
+	 * If is_partial_bitstream is set, then PROG_B is not asserted
+	 * (xdevcfg_reset_pl function) and also zynq_slcr_init_preload_fpga and
+	 * zynq_slcr_init_postload_fpga functions are not invoked.
+	 */
+	if (drvdata->is_partial_bitstream)
+		xdevcfg_enable_partial(drvdata);
+	else
+		zynq_slcr_init_preload_fpga();
+
+	/*
+	 * Only do the reset of the PL for Zynq as it causes problems on the
+	 * EP107 and the issue is not understood, but not worth investigating
+	 * as the emulation platform is very different than silicon and not a
+	 * complete implementation. Also, do not reset if it is a partial
+	 * bitstream.
+	 */
+	if ((!drvdata->ep107) && (!drvdata->is_partial_bitstream))
+		xdevcfg_reset_pl(drvdata->base_address);
+
+	xdevcfg_writereg(drvdata->base_address + XDCFG_INT_STS_OFFSET,
+			XDCFG_IXR_PCFG_DONE_MASK);
+
+error:
+	mutex_unlock(&drvdata->sem);
+err_clk:
+	clk_disable(drvdata->clk);
+	return status;
+}
+
+/**
+ * xdevcfg_release() - The is the driver release function.
+ * @inode:	Pointer to the inode structure of this device.
+ * @file:	Pointer to the file structure.
+ * returns:	Success.
+ */
+static int xdevcfg_release(struct inode *inode, struct file *file)
+{
+	struct xdevcfg_drvdata *drvdata = file->private_data;
+
+	if (drvdata->is_partial_bitstream)
+		xdevcfg_disable_partial(drvdata);
+	else
+		zynq_slcr_init_postload_fpga();
+
+
+	if (drvdata->residue_len)
+		printk("Did not transfer last %d bytes\n",
+			drvdata->residue_len);
+
+	drvdata->is_open = 0;
+
+	return 0;
+}
+
+static const struct file_operations xdevcfg_fops = {
+	.owner = THIS_MODULE,
+	.write = xdevcfg_write,
+	.read = xdevcfg_read,
+	.open = xdevcfg_open,
+	.release = xdevcfg_release,
+};
+
+/*
+ * The following functions are the routines provided to the user to
+ * set/get the status bit value in the control/lock registers.
+ */
+
+/**
+ * xdevcfg_set_dap_en() - This function sets the DAP bits in the
+ * control register with the given value.
+ * @dev:	Pointer to the device structure.
+ * @attr:	Pointer to the device attribute structure.
+ * @buf:	Pointer to the buffer location for the configuration
+ *		data.
+ * @size:	The number of bytes used from the buffer
+ * returns:	negative error if the string could not be converted
+ *		or the size of the buffer.
+ */
+static ssize_t xdevcfg_set_dap_en(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	u32 ctrl_reg_status;
+	unsigned long flags;
+	unsigned long mask_bit;
+	int status;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	ctrl_reg_status = xdevcfg_readreg(drvdata->base_address +
+				XDCFG_CTRL_OFFSET);
+	spin_lock_irqsave(&drvdata->lock, flags);
+
+	status = kstrtoul(buf, 10, &mask_bit);
+
+	if (status)
+		goto err_unlock;
+
+	if (mask_bit > 7) {
+		status = -EINVAL;
+		goto err_unlock;
+	}
+
+	xdevcfg_writereg(drvdata->base_address + XDCFG_CTRL_OFFSET,
+			(ctrl_reg_status |
+			 (((u32)mask_bit) & XDCFG_CTRL_DAP_EN_MASK)));
+
+	spin_unlock_irqrestore(&drvdata->lock, flags);
+
+	clk_disable(drvdata->clk);
+
+	return size;
+
+err_unlock:
+	spin_unlock_irqrestore(&drvdata->lock, flags);
+	clk_disable(drvdata->clk);
+
+	return status;
+}
+
+/**
+ * xdevcfg_show_dap_en_status() - The function returns the DAP_EN bits status in
+ * the control register.
+ * @dev:	Pointer to the device structure.
+ * @attr:	Pointer to the device attribute structure.
+ * @buf:	Pointer to the buffer location for the configuration
+ *		data.
+ * returns:	Size of the buffer.
+ */
+static ssize_t xdevcfg_show_dap_en_status(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	u32 dap_en_status;
+	int status;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	dap_en_status = xdevcfg_readreg(drvdata->base_address +
+				XDCFG_CTRL_OFFSET) & XDCFG_CTRL_DAP_EN_MASK;
+
+	clk_disable(drvdata->clk);
+
+	status = sprintf(buf, "%d\n", dap_en_status);
+
+	return status;
+}
+
+static DEVICE_ATTR(enable_dap, 0644, xdevcfg_show_dap_en_status,
+				xdevcfg_set_dap_en);
+
+/**
+ * xdevcfg_set_dbgen() - This function sets the DBGEN bit in the
+ * control register with the given value.
+ * @dev:	Pointer to the device structure.
+ * @attr:	Pointer to the device attribute structure.
+ * @buf:	Pointer to the buffer location for the configuration
+ *		data.
+ * @size:	The number of bytes used from the buffer
+ * returns:	-EINVAL if invalid parameter is sent or size
+ */
+static ssize_t xdevcfg_set_dbgen(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	u32 ctrl_reg_status;
+	unsigned long flags;
+	unsigned long mask_bit;
+	int status;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	ctrl_reg_status = xdevcfg_readreg(drvdata->base_address +
+				XDCFG_CTRL_OFFSET);
+
+	status = kstrtoul(buf, 10, &mask_bit);
+
+	if (status)
+		goto err_clk;
+
+	if (mask_bit > 1) {
+		status = -EINVAL;
+		goto err_clk;
+	}
+
+	spin_lock_irqsave(&drvdata->lock, flags);
+
+	if (mask_bit)
+		xdevcfg_writereg(drvdata->base_address + XDCFG_CTRL_OFFSET,
+				(ctrl_reg_status | XDCFG_CTRL_DBGEN_MASK));
+	else
+		xdevcfg_writereg(drvdata->base_address + XDCFG_CTRL_OFFSET,
+				(ctrl_reg_status & (~XDCFG_CTRL_DBGEN_MASK)));
+
+	spin_unlock_irqrestore(&drvdata->lock, flags);
+
+	clk_disable(drvdata->clk);
+
+	return size;
+
+err_clk:
+	clk_disable(drvdata->clk);
+
+	return status;
+}
+
+/**
+ * xdevcfg_show_dbgen_status() - The function returns the DBGEN bit status in
+ * the control register.
+ * @dev:	Pointer to the device structure.
+ * @attr:	Pointer to the device attribute structure.
+ * @buf:	Pointer to the buffer location for the configuration
+ *		data.
+ * returns:	Size of the buffer.
+ */
+static ssize_t xdevcfg_show_dbgen_status(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	u32 dbgen_status;
+	ssize_t status;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	dbgen_status = xdevcfg_readreg(drvdata->base_address +
+				XDCFG_CTRL_OFFSET) & XDCFG_CTRL_DBGEN_MASK;
+
+	clk_disable(drvdata->clk);
+
+	status = sprintf(buf, "%d\n", (dbgen_status >> 3));
+
+	return status;
+}
+
+static DEVICE_ATTR(enable_dbg_in, 0644, xdevcfg_show_dbgen_status,
+				xdevcfg_set_dbgen);
+
+/**
+ * xdevcfg_set_niden() - This function sets the NIDEN bit in the
+ * control register with the given value.
+ * @dev:	Pointer to the device structure.
+ * @attr:	Pointer to the device attribute structure.
+ * @buf:	Pointer to the buffer location for the configuration
+ *		data.
+ * @size:	The number of bytes used from the buffer
+ * returns:	-EINVAL if invalid parameter is sent or size
+ */
+static ssize_t xdevcfg_set_niden(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	u32 ctrl_reg_status;
+	unsigned long flags;
+	unsigned long mask_bit;
+	int status;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	ctrl_reg_status = xdevcfg_readreg(drvdata->base_address +
+				XDCFG_CTRL_OFFSET);
+
+	status = kstrtoul(buf, 10, &mask_bit);
+
+	if (status)
+		goto err_clk;
+
+	if (mask_bit > 1) {
+		status = -EINVAL;
+		goto err_clk;
+	}
+
+	spin_lock_irqsave(&drvdata->lock, flags);
+
+	if (mask_bit)
+		xdevcfg_writereg(drvdata->base_address + XDCFG_CTRL_OFFSET,
+				(ctrl_reg_status | XDCFG_CTRL_NIDEN_MASK));
+	else
+		xdevcfg_writereg(drvdata->base_address + XDCFG_CTRL_OFFSET,
+				(ctrl_reg_status & (~XDCFG_CTRL_NIDEN_MASK)));
+
+	spin_unlock_irqrestore(&drvdata->lock, flags);
+
+	clk_disable(drvdata->clk);
+
+	return size;
+
+err_clk:
+	clk_disable(drvdata->clk);
+
+	return status;
+}
+
+/**
+ * xdevcfg_show_niden_status() - The function returns the NIDEN bit status in
+ * the control register.
+ * @dev:	Pointer to the device structure.
+ * @attr:	Pointer to the device attribute structure.
+ * @buf:	Pointer to the buffer location for the configuration
+ *		data.
+ * returns:	Size of the buffer.
+ */
+static ssize_t xdevcfg_show_niden_status(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	u32 niden_status;
+	ssize_t status;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	niden_status = xdevcfg_readreg(drvdata->base_address +
+				XDCFG_CTRL_OFFSET) & XDCFG_CTRL_NIDEN_MASK;
+
+	clk_disable(drvdata->clk);
+
+	status = sprintf(buf, "%d\n", (niden_status >> 4));
+
+	return status;
+}
+
+static DEVICE_ATTR(enable_dbg_nonin, 0644, xdevcfg_show_niden_status,
+			xdevcfg_set_niden);
+
+/**
+ * xdevcfg_set_spiden() - This function sets the SPIDEN bit in the
+ * control register with the given value.
+ * @dev:	Pointer to the device structure.
+ * @attr:	Pointer to the device attribute structure.
+ * @buf:	Pointer to the buffer location for the configuration
+ *		data.
+ * @size:	The number of bytes used from the buffer
+ * returns:	-EINVAL if invalid parameter is sent or size
+ */
+static ssize_t xdevcfg_set_spiden(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	u32 ctrl_reg_status;
+	unsigned long flags;
+	unsigned long mask_bit;
+	int status;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	ctrl_reg_status = xdevcfg_readreg(drvdata->base_address +
+				XDCFG_CTRL_OFFSET);
+
+	status = kstrtoul(buf, 10, &mask_bit);
+
+	if (status)
+		goto err_clk;
+
+	if (mask_bit > 1) {
+		status = -EINVAL;
+		goto err_clk;
+	}
+
+	spin_lock_irqsave(&drvdata->lock, flags);
+
+	if (mask_bit)
+		xdevcfg_writereg(drvdata->base_address + XDCFG_CTRL_OFFSET,
+				(ctrl_reg_status | XDCFG_CTRL_SPIDEN_MASK));
+	else
+
+		xdevcfg_writereg(drvdata->base_address + XDCFG_CTRL_OFFSET,
+				(ctrl_reg_status & (~XDCFG_CTRL_SPIDEN_MASK)));
+
+	spin_unlock_irqrestore(&drvdata->lock, flags);
+
+	clk_disable(drvdata->clk);
+
+	return size;
+
+err_clk:
+	clk_disable(drvdata->clk);
+
+	return status;
+}
+
+/**
+ * xdevcfg_show_spiden_status() - The function returns the SPIDEN bit status in
+ * the control register.
+ * @dev:	Pointer to the device structure.
+ * @attr:	Pointer to the device attribute structure.
+ * @buf:	Pointer to the buffer location for the configuration
+ *		data.
+ * returns:	Size of the buffer.
+ */
+static ssize_t xdevcfg_show_spiden_status(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	u32 spiden_status;
+	ssize_t status;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	spiden_status = xdevcfg_readreg(drvdata->base_address +
+			XDCFG_CTRL_OFFSET) & XDCFG_CTRL_SPIDEN_MASK;
+
+	clk_disable(drvdata->clk);
+
+	status = sprintf(buf, "%d\n", (spiden_status >> 5));
+
+	return status;
+}
+
+static DEVICE_ATTR(enable_sec_dbg_in, 0644, xdevcfg_show_spiden_status,
+				xdevcfg_set_spiden);
+
+/**
+ * xdevcfg_set_spniden() - This function sets the SPNIDEN bit in the
+ * control register with the given value.
+ * @dev:	Pointer to the device structure.
+ * @attr:	Pointer to the device attribute structure.
+ * @buf:	Pointer to the buffer location for the configuration
+ *		data.
+ * @size:	The number of bytes used from the buffer
+ * returns:	-EINVAL if invalid parameter is sent or the size of buffer
+ */
+static ssize_t xdevcfg_set_spniden(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	u32 ctrl_reg_status;
+	unsigned long flags;
+	unsigned long mask_bit;
+	ssize_t status;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	ctrl_reg_status = xdevcfg_readreg(drvdata->base_address +
+				XDCFG_CTRL_OFFSET);
+	status = kstrtoul(buf, 10, &mask_bit);
+
+	if (status)
+		goto err_clk;
+
+	if (mask_bit > 1) {
+		status = -EINVAL;
+		goto err_clk;
+	}
+
+	spin_lock_irqsave(&drvdata->lock, flags);
+
+	if (mask_bit)
+		xdevcfg_writereg(drvdata->base_address + XDCFG_CTRL_OFFSET,
+				(ctrl_reg_status | XDCFG_CTRL_SPNIDEN_MASK));
+	else
+		xdevcfg_writereg(drvdata->base_address + XDCFG_CTRL_OFFSET,
+				(ctrl_reg_status & (~XDCFG_CTRL_SPNIDEN_MASK)));
+
+	spin_unlock_irqrestore(&drvdata->lock, flags);
+
+	clk_disable(drvdata->clk);
+
+	return size;
+
+err_clk:
+	clk_disable(drvdata->clk);
+
+	return status;
+}
+
+/**
+ * xdevcfg_show_spniden_status() - The function returns the SPNIDEN bit status
+ * in the control register.
+ * @dev:	Pointer to the device structure.
+ * @attr:	Pointer to the device attribute structure.
+ * @buf:	Pointer to the buffer location for the configuration
+ *		data.
+ * returns:	Size of the buffer.
+ */
+static ssize_t xdevcfg_show_spniden_status(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	u32 spniden_status;
+	ssize_t status;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	spniden_status = xdevcfg_readreg(drvdata->base_address +
+			XDCFG_CTRL_OFFSET) & XDCFG_CTRL_SPNIDEN_MASK;
+
+	clk_disable(drvdata->clk);
+
+	status = sprintf(buf, "%d\n", (spniden_status >> 6));
+
+	return status;
+}
+
+static DEVICE_ATTR(enable_sec_dbg_nonin, 0644, xdevcfg_show_spniden_status,
+					xdevcfg_set_spniden);
+
+/**
+ * xdevcfg_set_seu() - This function sets the SEU_EN bit in the
+ * control register with the given value
+ * @dev:	Pointer to the device structure.
+ * @attr:	Pointer to the device attribute structure.
+ * @buf:	Pointer to the buffer location for the configuration
+ *		data.
+ * @size:	The number of bytes used from the buffer
+ * returns:	-EINVAL if invalid parameter is sent or size
+ */
+static ssize_t xdevcfg_set_seu(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	u32 ctrl_reg_status;
+	unsigned long flags;
+	unsigned long mask_bit;
+	ssize_t status;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	ctrl_reg_status = xdevcfg_readreg(drvdata->base_address +
+				XDCFG_CTRL_OFFSET);
+
+	status = kstrtoul(buf, 10, &mask_bit);
+
+	if (status)
+		goto err_clk;
+
+	if (mask_bit > 1) {
+		status = -EINVAL;
+		goto err_clk;
+	}
+
+	spin_lock_irqsave(&drvdata->lock, flags);
+
+	if (mask_bit)
+		xdevcfg_writereg(drvdata->base_address + XDCFG_CTRL_OFFSET,
+				(ctrl_reg_status | XDCFG_CTRL_SEU_EN_MASK));
+	else
+		xdevcfg_writereg(drvdata->base_address + XDCFG_CTRL_OFFSET,
+				(ctrl_reg_status & (~XDCFG_CTRL_SEU_EN_MASK)));
+
+	spin_unlock_irqrestore(&drvdata->lock, flags);
+
+	clk_disable(drvdata->clk);
+
+	return size;
+
+err_clk:
+	clk_disable(drvdata->clk);
+
+	return status;
+}
+
+/**
+ * xdevcfg_show_seu_status() - The function returns the SEU_EN bit status
+ * in the control register.
+ * @dev:	Pointer to the device structure.
+ * @attr:	Pointer to the device attribute structure.
+ * @buf:	Pointer to the buffer location for the configuration
+ *		data.
+ * returns:	size of the buffer.
+ */
+static ssize_t xdevcfg_show_seu_status(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	u32 seu_status;
+	ssize_t status;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	seu_status = xdevcfg_readreg(drvdata->base_address +
+			XDCFG_CTRL_OFFSET) & XDCFG_CTRL_SEU_EN_MASK;
+
+	clk_disable(drvdata->clk);
+
+	status = sprintf(buf, "%d\n", (seu_status > 8));
+
+	return status;
+}
+
+static DEVICE_ATTR(enable_seu, 0644, xdevcfg_show_seu_status, xdevcfg_set_seu);
+
+/**
+ * xdevcfg_set_aes() - This function sets the AES_EN bits in the
+ * control register with either all 1s or all 0s.
+ * @dev:	Pointer to the device structure.
+ * @attr:	Pointer to the device attribute structure.
+ * @buf:	Pointer to the buffer location for the configuration
+ *		data.
+ * @size:	The number of bytes used from the buffer
+ * returns:	-EINVAL if invalid parameter is sent or size
+ *
+ * The user must send only one bit in the buffer to notify whether he wants to
+ * either set or reset these bits.
+ */
+static ssize_t xdevcfg_set_aes(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	u32 ctrl_reg_status;
+	unsigned long flags;
+	unsigned long mask_bit;
+	int status;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	ctrl_reg_status = xdevcfg_readreg(drvdata->base_address +
+				XDCFG_CTRL_OFFSET);
+
+	status = kstrtoul(buf, 10, &mask_bit);
+
+	if (status < 0)
+		goto err_clk;
+
+	if (mask_bit > 1) {
+		status = -EINVAL;
+		goto err_clk;
+	}
+
+
+	spin_lock_irqsave(&drvdata->lock, flags);
+
+	if (mask_bit)
+		xdevcfg_writereg(drvdata->base_address + XDCFG_CTRL_OFFSET,
+				(ctrl_reg_status |
+				 XDCFG_CTRL_PCFG_AES_EN_MASK |
+				 XDCFG_CTRL_PCAP_RATE_EN_MASK));
+	else
+		xdevcfg_writereg(drvdata->base_address + XDCFG_CTRL_OFFSET,
+				(ctrl_reg_status &
+				 ~(XDCFG_CTRL_PCFG_AES_EN_MASK |
+				 XDCFG_CTRL_PCAP_RATE_EN_MASK)));
+
+	spin_unlock_irqrestore(&drvdata->lock, flags);
+
+	clk_disable(drvdata->clk);
+
+	return size;
+
+err_clk:
+	clk_disable(drvdata->clk);
+
+	return status;
+}
+
+/**
+ * xdevcfg_show_aes_status() - The function returns the AES_EN bit status
+ * in the control register.
+ * @dev:	Pointer to the device structure.
+ * @attr:	Pointer to the device attribute structure.
+ * @buf:	Pointer to the buffer location for the configuration
+ *		data.
+ * returns:	size of the buffer.
+ */
+static ssize_t xdevcfg_show_aes_status(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	u32 aes_status;
+	ssize_t status;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	aes_status = xdevcfg_readreg(drvdata->base_address +
+			XDCFG_CTRL_OFFSET) & XDCFG_CTRL_PCFG_AES_EN_MASK;
+
+	clk_disable(drvdata->clk);
+
+	status = sprintf(buf, "%d\n", (aes_status >> 9));
+
+	return status;
+}
+
+static DEVICE_ATTR(enable_aes, 0644, xdevcfg_show_aes_status, xdevcfg_set_aes);
+
+/**
+ * xdevcfg_set_aes_en_lock() - This function sets the LOCK_AES_EN bit in the
+ * lock register.
+ * @dev:	Pointer to the device structure.
+ * @attr:	Pointer to the device attribute structure.
+ * @buf:	Pointer to the buffer location for the configuration
+ *		data.
+ * @size:	The number of bytes used from the buffer
+ * returns:	-EINVAL if invalid parameter is sent or size
+ */
+static ssize_t xdevcfg_set_aes_en_lock(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	u32 aes_en_lock_status;
+	unsigned long flags;
+	unsigned long mask_bit;
+	ssize_t status;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	aes_en_lock_status = xdevcfg_readreg(drvdata->base_address +
+				XDCFG_LOCK_OFFSET);
+
+	status = kstrtoul(buf, 10, &mask_bit);
+
+	if (status)
+		goto err_clk;
+
+	if (mask_bit > 1) {
+		status = -EINVAL;
+		goto err_clk;
+	}
+
+	spin_lock_irqsave(&drvdata->lock, flags);
+
+	if (mask_bit)
+		xdevcfg_writereg(drvdata->base_address + XDCFG_LOCK_OFFSET,
+				(aes_en_lock_status | XDCFG_LOCK_AES_EN_MASK));
+	else
+		xdevcfg_writereg(drvdata->base_address + XDCFG_LOCK_OFFSET,
+				(aes_en_lock_status &
+				 (~XDCFG_LOCK_AES_EN_MASK)));
+
+	spin_unlock_irqrestore(&drvdata->lock, flags);
+
+	clk_disable(drvdata->clk);
+
+	return size;
+
+err_clk:
+	clk_disable(drvdata->clk);
+
+	return status;
+}
+
+/**
+ * xdevcfg_show_aes_en_lock_status() - The function returns the LOCK_AES_EN bit
+ * status in the lock register.
+ * @dev:	Pointer to the device structure.
+ * @attr:	Pointer to the device attribute structure.
+ * @buf:	Pointer to the buffer location for the configuration
+ *		data.
+ * returns:	size of the buffer.
+ */
+static ssize_t xdevcfg_show_aes_en_lock_status(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	u32 aes_en_lock_status;
+	ssize_t status;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	aes_en_lock_status = xdevcfg_readreg(drvdata->base_address +
+			XDCFG_LOCK_OFFSET) & XDCFG_LOCK_AES_EN_MASK;
+
+	clk_disable(drvdata->clk);
+
+	status = sprintf(buf, "%d\n", (aes_en_lock_status >> 3));
+
+	return status;
+}
+
+static DEVICE_ATTR(aes_en_lock, 0644, xdevcfg_show_aes_en_lock_status,
+				xdevcfg_set_aes_en_lock);
+
+/**
+ * xdevcfg_set_seu_lock() - This function sets the LOCK_SEU bit in the
+ * lock register.
+ * @dev:	Pointer to the device structure.
+ * @attr:	Pointer to the device attribute structure.
+ * @buf:	Pointer to the buffer location for the configuration
+ *		data.
+ * @size:	The number of bytes used from the buffer
+ * returns:	-EINVAL if invalid parameter is sent or size
+ */
+static ssize_t xdevcfg_set_seu_lock(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	u32 seu_lock_status;
+	unsigned long flags;
+	unsigned long mask_bit;
+	ssize_t status;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	seu_lock_status = xdevcfg_readreg(drvdata->base_address +
+				XDCFG_LOCK_OFFSET);
+
+	status = kstrtoul(buf, 10, &mask_bit);
+
+	if (status)
+		goto err_clk;
+
+	if (mask_bit > 1) {
+		status = -EINVAL;
+		goto err_clk;
+	}
+
+	spin_lock_irqsave(&drvdata->lock, flags);
+
+	if (mask_bit)
+		xdevcfg_writereg(drvdata->base_address + XDCFG_LOCK_OFFSET,
+				(seu_lock_status | XDCFG_LOCK_SEU_MASK));
+	else
+		xdevcfg_writereg(drvdata->base_address + XDCFG_LOCK_OFFSET,
+				(seu_lock_status  & (~XDCFG_LOCK_SEU_MASK)));
+
+	spin_unlock_irqrestore(&drvdata->lock, flags);
+
+	clk_disable(drvdata->clk);
+
+	return size;
+
+err_clk:
+	clk_disable(drvdata->clk);
+
+	return status;
+}
+
+/**
+ * xdevcfg_show_seu_lock_status() - The function returns the LOCK_SEU bit
+ * status in the lock register.
+ * @dev:	Pointer to the device structure.
+ * @attr:	Pointer to the device attribute structure.
+ * @buf:	Pointer to the buffer location for the configuration
+ *		data.
+ * returns:	size of the buffer.
+ */
+static ssize_t xdevcfg_show_seu_lock_status(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	u32 seu_lock_status;
+	ssize_t status;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	seu_lock_status = xdevcfg_readreg(drvdata->base_address +
+			XDCFG_LOCK_OFFSET) & XDCFG_LOCK_SEU_MASK;
+
+	clk_disable(drvdata->clk);
+
+	status = sprintf(buf, "%d\n", (seu_lock_status >> 2));
+
+	return status;
+}
+
+static DEVICE_ATTR(seu_lock, 0644, xdevcfg_show_seu_lock_status,
+					xdevcfg_set_seu_lock);
+
+/**
+ * xdevcfg_set_dbg_lock() - This function sets the LOCK_DBG bit in the
+ * lock register.
+ * @dev:	Pointer to the device structure.
+ * @attr:	Pointer to the device attribute structure.
+ * @buf:	Pointer to the buffer location for the configuration
+ *		data.
+ * @size:	The number of bytes used from the buffer
+ * returns:	-EINVAL if invalid parameter is sent or size
+ */
+static ssize_t xdevcfg_set_dbg_lock(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	u32 lock_reg_status;
+	unsigned long flags;
+	unsigned long mask_bit;
+	ssize_t status;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	lock_reg_status = xdevcfg_readreg(drvdata->base_address +
+				XDCFG_LOCK_OFFSET);
+	status = kstrtoul(buf, 10, &mask_bit);
+
+	if (status)
+		goto err_clk;
+
+	if (mask_bit > 1) {
+		status = -EINVAL;
+		goto err_clk;
+	}
+
+	spin_lock_irqsave(&drvdata->lock, flags);
+
+	if (mask_bit)
+		xdevcfg_writereg(drvdata->base_address + XDCFG_LOCK_OFFSET,
+				(lock_reg_status | XDCFG_LOCK_DBG_MASK));
+	else
+		xdevcfg_writereg(drvdata->base_address + XDCFG_LOCK_OFFSET,
+				(lock_reg_status & (~XDCFG_LOCK_DBG_MASK)));
+
+	spin_unlock_irqrestore(&drvdata->lock, flags);
+
+	clk_disable(drvdata->clk);
+
+	return size;
+
+err_clk:
+	clk_disable(drvdata->clk);
+
+	return status;
+}
+
+/**
+ * xdevcfg_show_dbg_lock_status() - The function returns the LOCK_DBG bit
+ * status in the lock register.
+ * @dev:	Pointer to the device structure.
+ * @attr:	Pointer to the device attribute structure.
+ * @buf:	Pointer to the buffer location for the configuration
+ *		data.
+ * returns:	size of the buffer.
+ */
+static ssize_t xdevcfg_show_dbg_lock_status(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	u32 dbg_lock_status;
+	ssize_t status;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	dbg_lock_status = xdevcfg_readreg(drvdata->base_address +
+			XDCFG_LOCK_OFFSET) & XDCFG_LOCK_DBG_MASK;
+
+	clk_disable(drvdata->clk);
+
+	status = sprintf(buf, "%d\n", dbg_lock_status);
+
+	return status;
+}
+
+static DEVICE_ATTR(dbg_lock, 0644, xdevcfg_show_dbg_lock_status,
+				xdevcfg_set_dbg_lock);
+
+/**
+ * xdevcfg_show_prog_done_status() - The function returns the PROG_DONE bit
+ * status in the interrupt status register.
+ * @dev:	Pointer to the device structure.
+ * @attr:	Pointer to the device attribute structure.
+ * @buf:	Pointer to the buffer location for the configuration
+ *		data.
+ * returns:	size of the buffer.
+ */
+static ssize_t xdevcfg_show_prog_done_status(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	u32 prog_done_status;
+	ssize_t status;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	status = clk_enable(drvdata->clk);
+	if (status)
+		return status;
+
+	prog_done_status = xdevcfg_readreg(drvdata->base_address +
+			XDCFG_INT_STS_OFFSET) & XDCFG_IXR_PCFG_DONE_MASK;
+
+	clk_disable(drvdata->clk);
+
+	status = sprintf(buf, "%d\n", (prog_done_status >> 2));
+
+	return status;
+}
+
+static DEVICE_ATTR(prog_done, 0644, xdevcfg_show_prog_done_status,
+				NULL);
+
+/**
+ * xdevcfg_set_is_partial_bitstream() - This function sets the
+ * is_partial_bitstream variable. If is_partial_bitstream is set,
+ * then PROG_B is not asserted (xdevcfg_reset_pl) and also
+ * zynq_slcr_init_preload_fpga and zynq_slcr_init_postload_fpga functions
+ * are not invoked.
+ * @dev:	Pointer to the device structure.
+ * @attr:	Pointer to the device attribute structure.
+ * @buf:	Pointer to the buffer location for the configuration
+ *		data.
+ * @size:	The number of bytes used from the buffer
+ * returns:	-EINVAL if invalid parameter is sent or size
+ */
+static ssize_t xdevcfg_set_is_partial_bitstream(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	unsigned long mask_bit;
+	ssize_t status;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	status = kstrtoul(buf, 10, &mask_bit);
+
+	if (status)
+		return status;
+
+	if (mask_bit > 1)
+		return -EINVAL;
+
+	if (mask_bit)
+		drvdata->is_partial_bitstream = 1;
+	else
+		drvdata->is_partial_bitstream = 0;
+
+	return size;
+}
+
+/**
+ * xdevcfg_show_is_partial_bitstream_status() - The function returns the
+ * value of is_partial_bitstream variable.
+ * @dev:	Pointer to the device structure.
+ * @attr:	Pointer to the device attribute structure.
+ * @buf:	Pointer to the buffer location for the configuration
+ *		data.
+ * returns:	size of the buffer.
+ */
+static ssize_t xdevcfg_show_is_partial_bitstream_status(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	ssize_t status;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	status = sprintf(buf, "%d\n", drvdata->is_partial_bitstream);
+
+	return status;
+}
+
+static DEVICE_ATTR(is_partial_bitstream, 0644,
+				xdevcfg_show_is_partial_bitstream_status,
+				xdevcfg_set_is_partial_bitstream);
+
+static const struct attribute *xdevcfg_attrs[] = {
+	&dev_attr_prog_done.attr, /* PCFG_DONE bit in Intr Status register */
+	&dev_attr_dbg_lock.attr, /* Debug lock bit in Lock register */
+	&dev_attr_seu_lock.attr, /* SEU lock bit in Lock register */
+	&dev_attr_aes_en_lock.attr, /* AES EN lock bit in Lock register */
+	&dev_attr_enable_aes.attr, /* AES EN bit in Control register */
+	&dev_attr_enable_seu.attr, /* SEU EN bit in Control register */
+	&dev_attr_enable_sec_dbg_nonin.attr, /*SPNIDEN bit in Control register*/
+	&dev_attr_enable_sec_dbg_in.attr, /*SPIDEN bit in Control register */
+	&dev_attr_enable_dbg_nonin.attr, /* NIDEN bit in Control register */
+	&dev_attr_enable_dbg_in.attr, /* DBGEN bit in Control register */
+	&dev_attr_enable_dap.attr, /* DAP_EN bits in Control register */
+	&dev_attr_is_partial_bitstream.attr, /* Flag for partial bitstream */
+	NULL,
+};
+
+
+static const struct attribute_group xdevcfg_attr_group = {
+	.attrs = (struct attribute **) xdevcfg_attrs,
+};
+
+static ssize_t fclk_enable_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct fclk_data *pdata = dev_get_drvdata(dev);
+
+	return scnprintf(buf, PAGE_SIZE, "%u\n", pdata->enabled);
+}
+
+static ssize_t fclk_enable_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	unsigned long enable;
+	int ret;
+	struct fclk_data *pdata = dev_get_drvdata(dev);
+
+	ret = kstrtoul(buf, 0, &enable);
+	if (ret)
+		return -EINVAL;
+
+	enable = !!enable;
+	if (enable == pdata->enabled)
+		return count;
+
+	if (enable)
+		ret = clk_enable(pdata->clk);
+	else
+		clk_disable(pdata->clk);
+
+	if (ret)
+		return ret;
+
+	pdata->enabled = enable;
+	return count;
+}
+
+static DEVICE_ATTR(enable, 0644, fclk_enable_show, fclk_enable_store);
+
+static ssize_t fclk_set_rate_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct fclk_data *pdata = dev_get_drvdata(dev);
+
+	return scnprintf(buf, PAGE_SIZE, "%lu\n", clk_get_rate(pdata->clk));
+}
+
+static ssize_t fclk_set_rate_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	int ret = 0;
+	unsigned long rate;
+	struct fclk_data *pdata = dev_get_drvdata(dev);
+
+	ret = kstrtoul(buf, 0, &rate);
+	if (ret)
+		return -EINVAL;
+
+	rate = clk_round_rate(pdata->clk, rate);
+	ret = clk_set_rate(pdata->clk, rate);
+
+	return ret ? ret : count;
+}
+
+static DEVICE_ATTR(set_rate, 0644, fclk_set_rate_show, fclk_set_rate_store);
+
+static ssize_t fclk_round_rate_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct fclk_data *pdata = dev_get_drvdata(dev);
+
+	return scnprintf(buf, PAGE_SIZE, "%lu => %lu\n", pdata->rate_rnd,
+			clk_round_rate(pdata->clk, pdata->rate_rnd));
+}
+
+static ssize_t fclk_round_rate_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	int ret = 0;
+	unsigned long rate;
+	struct fclk_data *pdata = dev_get_drvdata(dev);
+
+	ret = kstrtoul(buf, 0, &rate);
+	if (ret)
+		return -EINVAL;
+
+	pdata->rate_rnd = rate;
+
+	return count;
+}
+
+static DEVICE_ATTR(round_rate, 0644, fclk_round_rate_show,
+		fclk_round_rate_store);
+
+static const struct attribute *fclk_ctrl_attrs[] = {
+	&dev_attr_enable.attr,
+	&dev_attr_set_rate.attr,
+	&dev_attr_round_rate.attr,
+	NULL,
+};
+
+static const struct attribute_group fclk_ctrl_attr_grp = {
+	.attrs = (struct attribute **)fclk_ctrl_attrs,
+};
+
+static ssize_t xdevcfg_fclk_export_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	int i, ret;
+	struct device *subdev;
+	struct fclk_data *fdata;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	for (i = 0; i < NUMFCLKS; i++) {
+		if (!strncmp(buf, fclk_name[i], strlen(fclk_name[i])))
+			break;
+	}
+
+	if (i < NUMFCLKS && !drvdata->fclk_exported[i]) {
+		drvdata->fclk_exported[i] = 1;
+		subdev = device_create(drvdata->fclk_class, dev, MKDEV(0, 0),
+				NULL, fclk_name[i]);
+		if (IS_ERR(subdev))
+			return PTR_ERR(subdev);
+		ret = clk_prepare(drvdata->fclk[i]);
+		if (ret)
+			return ret;
+		fdata = kzalloc(sizeof(*fdata), GFP_KERNEL);
+		if (!fdata) {
+			ret = -ENOMEM;
+			goto err_unprepare;
+		}
+		fdata->clk = drvdata->fclk[i];
+		dev_set_drvdata(subdev, fdata);
+		ret = sysfs_create_group(&subdev->kobj, &fclk_ctrl_attr_grp);
+		if (ret)
+			goto err_free;
+	} else {
+		return -EINVAL;
+	}
+
+	return size;
+
+err_free:
+	kfree(fdata);
+err_unprepare:
+	clk_unprepare(drvdata->fclk[i]);
+
+	return ret;
+}
+
+static ssize_t xdevcfg_fclk_export_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	int i;
+	ssize_t count = 0;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	for (i = 0; i < NUMFCLKS; i++) {
+		if (!drvdata->fclk_exported[i])
+			count += scnprintf(buf + count, PAGE_SIZE - count,
+					"%s\n", fclk_name[i]);
+	}
+	return count;
+}
+
+static DEVICE_ATTR(fclk_export, 0644, xdevcfg_fclk_export_show,
+		xdevcfg_fclk_export_store);
+
+static int match_fclk(struct device *dev, const void *data)
+{
+	struct fclk_data *fdata = dev_get_drvdata(dev);
+
+	return fdata->clk == data;
+}
+
+static ssize_t xdevcfg_fclk_unexport_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	int i;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	for (i = 0; i < NUMFCLKS; i++) {
+		if (!strncmp(buf, fclk_name[i], strlen(fclk_name[i])))
+			break;
+	}
+
+	if (i < NUMFCLKS && drvdata->fclk_exported[i]) {
+		struct fclk_data *fdata;
+		struct device *subdev;
+
+		drvdata->fclk_exported[i] = 0;
+		subdev = class_find_device(drvdata->fclk_class, NULL,
+				drvdata->fclk[i], match_fclk);
+		fdata = dev_get_drvdata(subdev);
+		if (fdata->enabled)
+			clk_disable(fdata->clk);
+		clk_unprepare(fdata->clk);
+		kfree(fdata);
+		device_unregister(subdev);
+		put_device(subdev);
+	} else {
+		return -EINVAL;
+	}
+
+	return size;
+}
+
+static ssize_t xdevcfg_fclk_unexport_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	int i;
+	ssize_t count = 0;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	for (i = 0; i < NUMFCLKS; i++) {
+		if (drvdata->fclk_exported[i])
+			count += scnprintf(buf + count, PAGE_SIZE - count,
+					"%s\n", fclk_name[i]);
+	}
+	return count;
+}
+
+static DEVICE_ATTR(fclk_unexport, 0644, xdevcfg_fclk_unexport_show,
+		xdevcfg_fclk_unexport_store);
+
+static const struct attribute *fclk_exp_attrs[] = {
+	&dev_attr_fclk_export.attr,
+	&dev_attr_fclk_unexport.attr,
+	NULL,
+};
+
+static const struct attribute_group fclk_exp_attr_grp = {
+	.attrs = (struct attribute **)fclk_exp_attrs,
+};
+
+static void xdevcfg_fclk_init(struct device *dev)
+{
+	int i;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	for (i = 0; i < NUMFCLKS; i++) {
+		drvdata->fclk[i] = clk_get(dev, fclk_name[i]);
+		if (IS_ERR(drvdata->fclk[i])) {
+			dev_warn(dev, "fclk not found\n");
+			return;
+		}
+	}
+
+	drvdata->fclk_class = class_create(THIS_MODULE, "fclk");
+	if (IS_ERR(drvdata->fclk_class)) {
+		dev_warn(dev, "failed to create fclk class\n");
+		return;
+	}
+
+	if (sysfs_create_group(&dev->kobj, &fclk_exp_attr_grp))
+		dev_warn(dev, "failed to create sysfs entries\n");
+}
+
+static void xdevcfg_fclk_remove(struct device *dev)
+{
+	int i;
+	struct xdevcfg_drvdata *drvdata = dev_get_drvdata(dev);
+
+	for (i = 0; i < NUMFCLKS; i++) {
+		if (drvdata->fclk_exported[i]) {
+			struct fclk_data *fdata;
+			struct device *subdev;
+
+			drvdata->fclk_exported[i] = 0;
+			subdev = class_find_device(drvdata->fclk_class, NULL,
+					drvdata->fclk[i], match_fclk);
+			fdata = dev_get_drvdata(subdev);
+			if (fdata->enabled)
+				clk_disable(fdata->clk);
+			clk_unprepare(fdata->clk);
+			kfree(fdata);
+			device_unregister(subdev);
+			put_device(subdev);
+
+		}
+	}
+
+	class_destroy(drvdata->fclk_class);
+	sysfs_remove_group(&dev->kobj, &fclk_exp_attr_grp);
+
+	return;
+}
+
+/**
+ * xdevcfg_drv_probe -  Probe call for the device.
+ *
+ * @pdev:	handle to the platform device structure.
+ * Returns 0 on success, negative error otherwise.
+ *
+ * It does all the memory allocation and registration for the device.
+ */
+static int xdevcfg_drv_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	struct xdevcfg_drvdata *drvdata;
+	dev_t devt;
+	int retval;
+	u32 ctrlreg;
+	struct device_node *np;
+	const void *prop;
+	int size;
+	struct device *dev;
+
+	drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
+	if (!drvdata)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	drvdata->base_address = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(drvdata->base_address))
+		return PTR_ERR(drvdata->base_address);
+
+	drvdata->irq = platform_get_irq(pdev, 0);
+	retval = devm_request_irq(&pdev->dev, drvdata->irq, &xdevcfg_irq,
+				0, dev_name(&pdev->dev), drvdata);
+	if (retval) {
+		dev_err(&pdev->dev, "No IRQ available");
+		return retval;
+	}
+
+	platform_set_drvdata(pdev, drvdata);
+	spin_lock_init(&drvdata->lock);
+	mutex_init(&drvdata->sem);
+	drvdata->is_open = 0;
+	drvdata->is_partial_bitstream = 0;
+	drvdata->dma_done = 0;
+	drvdata->error_status = 0;
+	dev_info(&pdev->dev, "ioremap %pa to %p\n",
+		 &res->start, drvdata->base_address);
+
+	drvdata->clk = devm_clk_get(&pdev->dev, "ref_clk");
+	if (IS_ERR(drvdata->clk)) {
+		dev_err(&pdev->dev, "input clock not found\n");
+		return PTR_ERR(drvdata->clk);
+	}
+
+	retval = clk_prepare_enable(drvdata->clk);
+	if (retval) {
+		dev_err(&pdev->dev, "unable to enable clock\n");
+		return retval;
+	}
+
+	/*
+	 * Figure out from the device tree if this is running on the EP107
+	 * emulation platform as it doesn't match the silicon exactly and the
+	 * driver needs to work accordingly.
+	 */
+	np = of_get_next_parent(pdev->dev.of_node);
+	np = of_get_next_parent(np);
+	prop = of_get_property(np, "compatible", &size);
+
+	if (prop != NULL) {
+		if ((strcmp((const char *)prop, "xlnx,zynq-ep107")) == 0)
+			drvdata->ep107 = 1;
+		else
+			drvdata->ep107 = 0;
+	}
+
+	/* Unlock the device */
+	xdevcfg_writereg(drvdata->base_address + XDCFG_UNLOCK_OFFSET,
+				0x757BDF0D);
+
+	/*
+	 * Set the configuration register with the following options
+	 *  - Reset FPGA
+	 *  - Enable the PCAP interface
+	 *  - Set the throughput rate for maximum speed
+	 *  - Set the CPU in user mode
+	 */
+	ctrlreg = xdevcfg_readreg(drvdata->base_address + XDCFG_CTRL_OFFSET);
+	ctrlreg &= ~XDCFG_CTRL_PCAP_PR_MASK;
+	ctrlreg |= XDCFG_CTRL_PCFG_PROG_B_MASK | XDCFG_CTRL_PCAP_MODE_MASK;
+	xdevcfg_writereg(drvdata->base_address + XDCFG_CTRL_OFFSET, ctrlreg);
+
+	/* Ensure internal PCAP loopback is disabled */
+	ctrlreg = xdevcfg_readreg(drvdata->base_address + XDCFG_MCTRL_OFFSET);
+	xdevcfg_writereg(drvdata->base_address + XDCFG_MCTRL_OFFSET,
+				(~XDCFG_MCTRL_PCAP_LPBK_MASK &
+				ctrlreg));
+
+
+	retval = alloc_chrdev_region(&devt, 0, XDEVCFG_DEVICES, DRIVER_NAME);
+	if (retval < 0)
+		goto failed5;
+
+	drvdata->devt = devt;
+
+	cdev_init(&drvdata->cdev, &xdevcfg_fops);
+	drvdata->cdev.owner = THIS_MODULE;
+	retval = cdev_add(&drvdata->cdev, devt, 1);
+	if (retval) {
+		dev_err(&pdev->dev, "cdev_add() failed\n");
+		goto failed6;
+	}
+
+	drvdata->class = class_create(THIS_MODULE, DRIVER_NAME);
+	if (IS_ERR(drvdata->class)) {
+		dev_err(&pdev->dev, "failed to create class\n");
+		goto failed6;
+	}
+
+	dev = device_create(drvdata->class, &pdev->dev, devt, drvdata,
+			DRIVER_NAME);
+	if (IS_ERR(dev)) {
+			dev_err(&pdev->dev, "unable to create device\n");
+			goto failed7;
+	}
+
+	/* create sysfs files for the device */
+	retval = sysfs_create_group(&(pdev->dev.kobj), &xdevcfg_attr_group);
+	if (retval) {
+		dev_err(&pdev->dev, "Failed to create sysfs attr group\n");
+		cdev_del(&drvdata->cdev);
+		goto failed8;
+	}
+
+	xdevcfg_fclk_init(&pdev->dev);
+
+	clk_disable(drvdata->clk);
+
+	return 0;		/* Success */
+
+failed8:
+	device_destroy(drvdata->class, drvdata->devt);
+failed7:
+	class_destroy(drvdata->class);
+failed6:
+	/* Unregister char driver */
+	unregister_chrdev_region(devt, XDEVCFG_DEVICES);
+failed5:
+	clk_disable_unprepare(drvdata->clk);
+
+	return retval;
+}
+
+/**
+ * xdevcfg_drv_remove -  Remove call for the device.
+ *
+ * @pdev:	handle to the platform device structure.
+ * Returns 0 or error status.
+ *
+ * Unregister the device after releasing the resources.
+ */
+static int xdevcfg_drv_remove(struct platform_device *pdev)
+{
+	struct xdevcfg_drvdata *drvdata;
+
+	drvdata = platform_get_drvdata(pdev);
+
+	if (!drvdata)
+		return -ENODEV;
+
+	unregister_chrdev_region(drvdata->devt, XDEVCFG_DEVICES);
+
+	sysfs_remove_group(&pdev->dev.kobj, &xdevcfg_attr_group);
+
+	xdevcfg_fclk_remove(&pdev->dev);
+	device_destroy(drvdata->class, drvdata->devt);
+	class_destroy(drvdata->class);
+	cdev_del(&drvdata->cdev);
+	clk_unprepare(drvdata->clk);
+
+	return 0;		/* Success */
+}
+
+static struct of_device_id xdevcfg_of_match[] = {
+	{ .compatible = "xlnx,zynq-devcfg-1.0", },
+	{ /* end of table */}
+};
+MODULE_DEVICE_TABLE(of, xdevcfg_of_match);
+
+/* Driver Structure */
+static struct platform_driver xdevcfg_platform_driver = {
+	.probe = xdevcfg_drv_probe,
+	.remove = xdevcfg_drv_remove,
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = DRIVER_NAME,
+		.of_match_table = xdevcfg_of_match,
+	},
+};
+
+module_platform_driver(xdevcfg_platform_driver);
+
+MODULE_AUTHOR("Xilinx, Inc");
+MODULE_DESCRIPTION("Xilinx Device Config Driver");
+MODULE_LICENSE("GPL");
--- a/arch/arm/mach-zynq/common.h
+++ b/arch/arm/mach-zynq/common.h
@@ -33,6 +33,9 @@ extern int zynq_cpun_start(u32 address,
 extern struct smp_operations zynq_smp_ops __initdata;
 #endif
 
+extern void zynq_slcr_init_preload_fpga(void);
+extern void zynq_slcr_init_postload_fpga(void);
+
 extern void __iomem *zynq_scu_base;
 
 void zynq_pm_late_init(void);
--- a/arch/arm/mach-zynq/slcr.c
+++ b/arch/arm/mach-zynq/slcr.c
@@ -24,10 +24,14 @@
 
 /* register offsets */
 #define SLCR_UNLOCK_OFFSET		0x8   /* SCLR unlock register */
+
 #define SLCR_PS_RST_CTRL_OFFSET		0x200 /* PS Software Reset Control */
+#define SLCR_FPGA_RST_CTRL_OFFSET	0x240 /* FPGA Software Reset Control */
 #define SLCR_A9_CPU_RST_CTRL_OFFSET	0x244 /* CPU Software Reset Control */
 #define SLCR_REBOOT_STATUS_OFFSET	0x258 /* PS Reboot Status */
 #define SLCR_PSS_IDCODE			0x530 /* PS IDCODE */
+#define SLCR_L2C_RAM			0xA1C /* L2C_RAM in AR#54190 */
+#define SLCR_LVL_SHFTR_EN_OFFSET	0x900 /* Level Shifters Enable */
 
 #define SLCR_UNLOCK_MAGIC		0xDF0D
 #define SLCR_A9_CPU_CLKSTOP		0x10
@@ -124,6 +128,35 @@ static struct notifier_block zynq_slcr_r
 };
 
 /**
+ * zynq_slcr_init_preload_fpga - Disable communication from the PL to PS.
+ */
+void zynq_slcr_init_preload_fpga(void)
+{
+	/* Assert FPGA top level output resets */
+	zynq_slcr_write(0xF, SLCR_FPGA_RST_CTRL_OFFSET);
+
+	/* Disable level shifters */
+	zynq_slcr_write(0, SLCR_LVL_SHFTR_EN_OFFSET);
+
+	/* Enable output level shifters */
+	zynq_slcr_write(0xA, SLCR_LVL_SHFTR_EN_OFFSET);
+}
+EXPORT_SYMBOL(zynq_slcr_init_preload_fpga);
+
+/**
+ * zynq_slcr_init_postload_fpga - Re-enable communication from the PL to PS.
+ */
+void zynq_slcr_init_postload_fpga(void)
+{
+	/* Enable level shifters */
+	zynq_slcr_write(0xf, SLCR_LVL_SHFTR_EN_OFFSET);
+
+	/* Deassert AXI interface resets */
+	zynq_slcr_write(0, SLCR_FPGA_RST_CTRL_OFFSET);
+}
+EXPORT_SYMBOL(zynq_slcr_init_postload_fpga);
+
+/**
  * zynq_slcr_cpu_start - Start cpu
  * @cpu:	cpu number
  */
@@ -227,6 +260,9 @@ int __init zynq_early_slcr_init(void)
 	/* unlock the SLCR so that registers can be changed */
 	zynq_slcr_unlock();
 
+	/* See AR#54190 design advisory */
+	regmap_update_bits(zynq_slcr_regmap, SLCR_L2C_RAM, 0x70707, 0x20202);
+
 	register_restart_handler(&zynq_slcr_restart_nb);
 
 	pr_info("%s mapped to %p\n", np->name, zynq_slcr_base);
--- a/arch/arm/boot/dts/zynq-7000.dtsi
+++ b/arch/arm/boot/dts/zynq-7000.dtsi
@@ -244,7 +244,7 @@
 			clkc: clkc@100 {
 				#clock-cells = <1>;
 				compatible = "xlnx,ps7-clkc";
-				fclk-enable = <0>;
+				fclk-enable = <0xf>;
 				clock-output-names = "armpll", "ddrpll", "iopll", "cpu_6or4x",
 						"cpu_3or2x", "cpu_2x", "cpu_1x", "ddr2x", "ddr3x",
 						"dci", "lqspi", "smc", "pcap", "gem0", "gem1",
@@ -296,8 +296,8 @@
 			reg = <0xf8007000 0x100>;
 			interrupt-parent = <&intc>;
 			interrupts = <0 8 4>;
-			clocks = <&clkc 12>;
-			clock-names = "ref_clk";
+			clocks = <&clkc 12>, <&clkc 15>, <&clkc 16>, <&clkc 17>, <&clkc 18>;
+			clock-names = "ref_clk", "fclk0", "fclk1", "fclk2", "fclk3";
 			syscon = <&slcr>;
 		};