Merge branch 'virtex-for-2.6.25' of git://git.secretlab.ca/git/linux-2.6-virtex into for-2.6.25

Documentation/powerpc/booting-without-of.txt

···
       Requred properties:
        - current-speed : Baud rate of uartlite
 
+      v) Xilinx hwicap
+
+		Xilinx hwicap devices provide access to the configuration logic
+		of the FPGA through the Internal Configuration Access Port
+		(ICAP).  The ICAP enables partial reconfiguration of the FPGA,
+		readback of the configuration information, and some control over
+		'warm boots' of the FPGA fabric.
+
+		Required properties:
+		- xlnx,family : The family of the FPGA, necessary since the
+                      capabilities of the underlying ICAP hardware
+                      differ between different families.  May be
+                      'virtex2p', 'virtex4', or 'virtex5'.
+
     p) Freescale Synchronous Serial Interface
 
        The SSI is a serial device that communicates with audio codecs.  It can

arch/powerpc/platforms/40x/virtex.c

···
 {
 	unsigned long root = of_get_flat_dt_root();
 
-	if (!of_flat_dt_is_compatible(root, "xilinx,virtex"))
+	if (!of_flat_dt_is_compatible(root, "xlnx,virtex"))
 		return 0;
 
 	return 1;

drivers/block/xsysace.c

···
 }
 
 /* Match table for of_platform binding */
-static struct of_device_id __devinit ace_of_match[] = {
-	{ .compatible = "xilinx,xsysace", },
+static struct of_device_id ace_of_match[] __devinitdata = {
+	{ .compatible = "xlnx,opb-sysace-1.00.b", },
+	{ .compatible = "xlnx,opb-sysace-1.00.c", },
+	{ .compatible = "xlnx,xps-sysace-1.00.a", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, ace_of_match);

drivers/char/Kconfig

···
 	  To compile this driver as a module, choose M here: the
 	  module will be called dtlk.
 
+config XILINX_HWICAP
+	tristate "Xilinx HWICAP Support"
+	depends on XILINX_VIRTEX
+	help
+	  This option enables support for Xilinx Internal Configuration
+	  Access Port (ICAP) driver.  The ICAP is used on Xilinx Virtex
+	  FPGA platforms to partially reconfigure the FPGA at runtime.
+
+	  If unsure, say N.
+
 config R3964
 	tristate "Siemens R3964 line discipline"
 	---help---

drivers/char/Makefile

···
 obj-$(CONFIG_SGI_DS1286)	+= ds1286.o
 obj-$(CONFIG_SGI_IP27_RTC)	+= ip27-rtc.o
 obj-$(CONFIG_DS1302)		+= ds1302.o
+obj-$(CONFIG_XILINX_HWICAP)	+= xilinx_hwicap/
 ifeq ($(CONFIG_GENERIC_NVRAM),y)
   obj-$(CONFIG_NVRAM)	+= generic_nvram.o
 else

drivers/char/xilinx_hwicap/Makefile

···
+#
+# Makefile for the Xilinx OPB hwicap driver
+#
+
+obj-$(CONFIG_XILINX_HWICAP) += xilinx_hwicap_m.o 
+ 
+xilinx_hwicap_m-y := xilinx_hwicap.o fifo_icap.o buffer_icap.o

drivers/char/xilinx_hwicap/buffer_icap.c

···
+/*****************************************************************************
+ *
+ *     Author: 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.
+ *
+ *     XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"
+ *     AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND
+ *     SOLUTIONS FOR XILINX DEVICES.  BY PROVIDING THIS DESIGN, CODE,
+ *     OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE,
+ *     APPLICATION OR STANDARD, XILINX IS MAKING NO REPRESENTATION
+ *     THAT THIS IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT,
+ *     AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE
+ *     FOR YOUR IMPLEMENTATION.  XILINX EXPRESSLY DISCLAIMS ANY
+ *     WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE
+ *     IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR
+ *     REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF
+ *     INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ *     FOR A PARTICULAR PURPOSE.
+ *
+ *     Xilinx products are not intended for use in life support appliances,
+ *     devices, or systems. Use in such applications is expressly prohibited.
+ *
+ *     (c) Copyright 2003-2008 Xilinx Inc.
+ *     All rights reserved.
+ *
+ *     You should have received a copy of the GNU General Public License along
+ *     with this program; if not, write to the Free Software Foundation, Inc.,
+ *     675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *****************************************************************************/
+
+#include "buffer_icap.h"
+
+/* Indicates how many bytes will fit in a buffer. (1 BRAM) */
+#define XHI_MAX_BUFFER_BYTES        2048
+#define XHI_MAX_BUFFER_INTS         (XHI_MAX_BUFFER_BYTES >> 2)
+
+/* File access and error constants */
+#define XHI_DEVICE_READ_ERROR       -1
+#define XHI_DEVICE_WRITE_ERROR      -2
+#define XHI_BUFFER_OVERFLOW_ERROR   -3
+
+#define XHI_DEVICE_READ             0x1
+#define XHI_DEVICE_WRITE            0x0
+
+/* Constants for checking transfer status */
+#define XHI_CYCLE_DONE              0
+#define XHI_CYCLE_EXECUTING         1
+
+/* buffer_icap register offsets */
+
+/* Size of transfer, read & write */
+#define XHI_SIZE_REG_OFFSET        0x800L
+/* offset into bram, read & write */
+#define XHI_BRAM_OFFSET_REG_OFFSET 0x804L
+/* Read not Configure, direction of transfer.  Write only */
+#define XHI_RNC_REG_OFFSET         0x808L
+/* Indicates transfer complete. Read only */
+#define XHI_STATUS_REG_OFFSET      0x80CL
+
+/* Constants for setting the RNC register */
+#define XHI_CONFIGURE              0x0UL
+#define XHI_READBACK               0x1UL
+
+/* Constants for the Done register */
+#define XHI_NOT_FINISHED           0x0UL
+#define XHI_FINISHED               0x1UL
+
+#define XHI_BUFFER_START 0
+
+/**
+ * buffer_icap_get_status: Get the contents of the status register.
+ * @parameter base_address: is the base address of the device
+ *
+ * The status register contains the ICAP status and the done bit.
+ *
+ * D8 - cfgerr
+ * D7 - dalign
+ * D6 - rip
+ * D5 - in_abort_l
+ * D4 - Always 1
+ * D3 - Always 1
+ * D2 - Always 1
+ * D1 - Always 1
+ * D0 - Done bit
+ **/
+static inline u32 buffer_icap_get_status(void __iomem *base_address)
+{
+	return in_be32(base_address + XHI_STATUS_REG_OFFSET);
+}
+
+/**
+ * buffer_icap_get_bram: Reads data from the storage buffer bram.
+ * @parameter base_address: contains the base address of the component.
+ * @parameter offset: The word offset from which the data should be read.
+ *
+ * A bram is used as a configuration memory cache.  One frame of data can
+ * be stored in this "storage buffer".
+ **/
+static inline u32 buffer_icap_get_bram(void __iomem *base_address,
+		u32 offset)
+{
+	return in_be32(base_address + (offset << 2));
+}
+
+/**
+ * buffer_icap_busy: Return true if the icap device is busy
+ * @parameter base_address: is the base address of the device
+ *
+ * The queries the low order bit of the status register, which
+ * indicates whether the current configuration or readback operation
+ * has completed.
+ **/
+static inline bool buffer_icap_busy(void __iomem *base_address)
+{
+	return (buffer_icap_get_status(base_address) & 1) == XHI_NOT_FINISHED;
+}
+
+/**
+ * buffer_icap_busy: Return true if the icap device is not busy
+ * @parameter base_address: is the base address of the device
+ *
+ * The queries the low order bit of the status register, which
+ * indicates whether the current configuration or readback operation
+ * has completed.
+ **/
+static inline bool buffer_icap_done(void __iomem *base_address)
+{
+	return (buffer_icap_get_status(base_address) & 1) == XHI_FINISHED;
+}
+
+/**
+ * buffer_icap_set_size: Set the size register.
+ * @parameter base_address: is the base address of the device
+ * @parameter data: The size in bytes.
+ *
+ * The size register holds the number of 8 bit bytes to transfer between
+ * bram and the icap (or icap to bram).
+ **/
+static inline void buffer_icap_set_size(void __iomem *base_address,
+		u32 data)
+{
+	out_be32(base_address + XHI_SIZE_REG_OFFSET, data);
+}
+
+/**
+ * buffer_icap_mSetoffsetReg: Set the bram offset register.
+ * @parameter base_address: contains the base address of the device.
+ * @parameter data: is the value to be written to the data register.
+ *
+ * The bram offset register holds the starting bram address to transfer
+ * data from during configuration or write data to during readback.
+ **/
+static inline void buffer_icap_set_offset(void __iomem *base_address,
+		u32 data)
+{
+	out_be32(base_address + XHI_BRAM_OFFSET_REG_OFFSET, data);
+}
+
+/**
+ * buffer_icap_set_rnc: Set the RNC (Readback not Configure) register.
+ * @parameter base_address: contains the base address of the device.
+ * @parameter data: is the value to be written to the data register.
+ *
+ * The RNC register determines the direction of the data transfer.  It
+ * controls whether a configuration or readback take place.  Writing to
+ * this register initiates the transfer.  A value of 1 initiates a
+ * readback while writing a value of 0 initiates a configuration.
+ **/
+static inline void buffer_icap_set_rnc(void __iomem *base_address,
+		u32 data)
+{
+	out_be32(base_address + XHI_RNC_REG_OFFSET, data);
+}
+
+/**
+ * buffer_icap_set_bram: Write data to the storage buffer bram.
+ * @parameter base_address: contains the base address of the component.
+ * @parameter offset: The word offset at which the data should be written.
+ * @parameter data: The value to be written to the bram offset.
+ *
+ * A bram is used as a configuration memory cache.  One frame of data can
+ * be stored in this "storage buffer".
+ **/
+static inline void buffer_icap_set_bram(void __iomem *base_address,
+		u32 offset, u32 data)
+{
+	out_be32(base_address + (offset << 2), data);
+}
+
+/**
+ * buffer_icap_device_read: Transfer bytes from ICAP to the storage buffer.
+ * @parameter drvdata: a pointer to the drvdata.
+ * @parameter offset: The storage buffer start address.
+ * @parameter count: The number of words (32 bit) to read from the
+ *           device (ICAP).
+ **/
+static int buffer_icap_device_read(struct hwicap_drvdata *drvdata,
+		u32 offset, u32 count)
+{
+
+	s32 retries = 0;
+	void __iomem *base_address = drvdata->base_address;
+
+	if (buffer_icap_busy(base_address))
+		return -EBUSY;
+
+	if ((offset + count) > XHI_MAX_BUFFER_INTS)
+		return -EINVAL;
+
+	/* setSize count*4 to get bytes. */
+	buffer_icap_set_size(base_address, (count << 2));
+	buffer_icap_set_offset(base_address, offset);
+	buffer_icap_set_rnc(base_address, XHI_READBACK);
+
+	while (buffer_icap_busy(base_address)) {
+		retries++;
+		if (retries > XHI_MAX_RETRIES)
+			return -EBUSY;
+	}
+	return 0;
+
+};
+
+/**
+ * buffer_icap_device_write: Transfer bytes from ICAP to the storage buffer.
+ * @parameter drvdata: a pointer to the drvdata.
+ * @parameter offset: The storage buffer start address.
+ * @parameter count: The number of words (32 bit) to read from the
+ *           device (ICAP).
+ **/
+static int buffer_icap_device_write(struct hwicap_drvdata *drvdata,
+		u32 offset, u32 count)
+{
+
+	s32 retries = 0;
+	void __iomem *base_address = drvdata->base_address;
+
+	if (buffer_icap_busy(base_address))
+		return -EBUSY;
+
+	if ((offset + count) > XHI_MAX_BUFFER_INTS)
+		return -EINVAL;
+
+	/* setSize count*4 to get bytes. */
+	buffer_icap_set_size(base_address, count << 2);
+	buffer_icap_set_offset(base_address, offset);
+	buffer_icap_set_rnc(base_address, XHI_CONFIGURE);
+
+	while (buffer_icap_busy(base_address)) {
+		retries++;
+		if (retries > XHI_MAX_RETRIES)
+			return -EBUSY;
+	}
+	return 0;
+
+};
+
+/**
+ * buffer_icap_reset: Reset the logic of the icap device.
+ * @parameter drvdata: a pointer to the drvdata.
+ *
+ * Writing to the status register resets the ICAP logic in an internal
+ * version of the core.  For the version of the core published in EDK,
+ * this is a noop.
+ **/
+void buffer_icap_reset(struct hwicap_drvdata *drvdata)
+{
+    out_be32(drvdata->base_address + XHI_STATUS_REG_OFFSET, 0xFEFE);
+}
+
+/**
+ * buffer_icap_set_configuration: Load a partial bitstream from system memory.
+ * @parameter drvdata: a pointer to the drvdata.
+ * @parameter data: Kernel address of the partial bitstream.
+ * @parameter size: the size of the partial bitstream in 32 bit words.
+ **/
+int buffer_icap_set_configuration(struct hwicap_drvdata *drvdata, u32 *data,
+			     u32 size)
+{
+	int status;
+	s32 buffer_count = 0;
+	s32 num_writes = 0;
+	bool dirty = 0;
+	u32 i;
+	void __iomem *base_address = drvdata->base_address;
+
+	/* Loop through all the data */
+	for (i = 0, buffer_count = 0; i < size; i++) {
+
+		/* Copy data to bram */
+		buffer_icap_set_bram(base_address, buffer_count, data[i]);
+		dirty = 1;
+
+		if (buffer_count < XHI_MAX_BUFFER_INTS - 1) {
+			buffer_count++;
+			continue;
+		}
+
+		/* Write data to ICAP */
+		status = buffer_icap_device_write(
+				drvdata,
+				XHI_BUFFER_START,
+				XHI_MAX_BUFFER_INTS);
+		if (status != 0) {
+			/* abort. */
+			buffer_icap_reset(drvdata);
+			return status;
+		}
+
+		buffer_count = 0;
+		num_writes++;
+		dirty = 0;
+	}
+
+	/* Write unwritten data to ICAP */
+	if (dirty) {
+		/* Write data to ICAP */
+		status = buffer_icap_device_write(drvdata, XHI_BUFFER_START,
+					     buffer_count);
+		if (status != 0) {
+			/* abort. */
+			buffer_icap_reset(drvdata);
+		}
+		return status;
+	}
+
+	return 0;
+};
+
+/**
+ * buffer_icap_get_configuration: Read configuration data from the device.
+ * @parameter drvdata: a pointer to the drvdata.
+ * @parameter data: Address of the data representing the partial bitstream
+ * @parameter size: the size of the partial bitstream in 32 bit words.
+ **/
+int buffer_icap_get_configuration(struct hwicap_drvdata *drvdata, u32 *data,
+			     u32 size)
+{
+	int status;
+	s32 buffer_count = 0;
+	s32 read_count = 0;
+	u32 i;
+	void __iomem *base_address = drvdata->base_address;
+
+	/* Loop through all the data */
+	for (i = 0, buffer_count = XHI_MAX_BUFFER_INTS; i < size; i++) {
+		if (buffer_count == XHI_MAX_BUFFER_INTS) {
+			u32 words_remaining = size - i;
+			u32 words_to_read =
+				words_remaining <
+				XHI_MAX_BUFFER_INTS ? words_remaining :
+				XHI_MAX_BUFFER_INTS;
+
+			/* Read data from ICAP */
+			status = buffer_icap_device_read(
+					drvdata,
+					XHI_BUFFER_START,
+					words_to_read);
+			if (status != 0) {
+				/* abort. */
+				buffer_icap_reset(drvdata);
+				return status;
+			}
+
+			buffer_count = 0;
+			read_count++;
+		}
+
+		/* Copy data from bram */
+		data[i] = buffer_icap_get_bram(base_address, buffer_count);
+		buffer_count++;
+	}
+
+	return 0;
+};

drivers/char/xilinx_hwicap/buffer_icap.h

···
+/*****************************************************************************
+ *
+ *     Author: 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.
+ *
+ *     XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"
+ *     AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND
+ *     SOLUTIONS FOR XILINX DEVICES.  BY PROVIDING THIS DESIGN, CODE,
+ *     OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE,
+ *     APPLICATION OR STANDARD, XILINX IS MAKING NO REPRESENTATION
+ *     THAT THIS IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT,
+ *     AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE
+ *     FOR YOUR IMPLEMENTATION.  XILINX EXPRESSLY DISCLAIMS ANY
+ *     WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE
+ *     IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR
+ *     REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF
+ *     INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ *     FOR A PARTICULAR PURPOSE.
+ *
+ *     Xilinx products are not intended for use in life support appliances,
+ *     devices, or systems. Use in such applications is expressly prohibited.
+ *
+ *     (c) Copyright 2003-2008 Xilinx Inc.
+ *     All rights reserved.
+ *
+ *     You should have received a copy of the GNU General Public License along
+ *     with this program; if not, write to the Free Software Foundation, Inc.,
+ *     675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *****************************************************************************/
+
+#ifndef XILINX_BUFFER_ICAP_H_	/* prevent circular inclusions */
+#define XILINX_BUFFER_ICAP_H_	/* by using protection macros */
+
+#include <linux/types.h>
+#include <linux/cdev.h>
+#include <linux/version.h>
+#include <linux/platform_device.h>
+
+#include <asm/io.h>
+#include "xilinx_hwicap.h"
+
+void buffer_icap_reset(struct hwicap_drvdata *drvdata);
+
+/* Loads a partial bitstream from system memory. */
+int buffer_icap_set_configuration(struct hwicap_drvdata *drvdata, u32 *data,
+			     u32 Size);
+
+/* Loads a partial bitstream from system memory. */
+int buffer_icap_get_configuration(struct hwicap_drvdata *drvdata, u32 *data,
+			     u32 Size);
+
+#endif

drivers/char/xilinx_hwicap/fifo_icap.c

···
+/*****************************************************************************
+ *
+ *     Author: 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.
+ *
+ *     XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"
+ *     AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND
+ *     SOLUTIONS FOR XILINX DEVICES.  BY PROVIDING THIS DESIGN, CODE,
+ *     OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE,
+ *     APPLICATION OR STANDARD, XILINX IS MAKING NO REPRESENTATION
+ *     THAT THIS IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT,
+ *     AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE
+ *     FOR YOUR IMPLEMENTATION.  XILINX EXPRESSLY DISCLAIMS ANY
+ *     WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE
+ *     IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR
+ *     REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF
+ *     INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ *     FOR A PARTICULAR PURPOSE.
+ *
+ *     Xilinx products are not intended for use in life support appliances,
+ *     devices, or systems. Use in such applications is expressly prohibited.
+ *
+ *     (c) Copyright 2007-2008 Xilinx Inc.
+ *     All rights reserved.
+ *
+ *     You should have received a copy of the GNU General Public License along
+ *     with this program; if not, write to the Free Software Foundation, Inc.,
+ *     675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *****************************************************************************/
+
+#include "fifo_icap.h"
+
+/* Register offsets for the XHwIcap device. */
+#define XHI_GIER_OFFSET	0x1C  /* Device Global Interrupt Enable Reg */
+#define XHI_IPISR_OFFSET 0x20  /* Interrupt Status Register */
+#define XHI_IPIER_OFFSET 0x28  /* Interrupt Enable Register */
+#define XHI_WF_OFFSET 0x100 /* Write FIFO */
+#define XHI_RF_OFFSET 0x104 /* Read FIFO */
+#define XHI_SZ_OFFSET 0x108 /* Size Register */
+#define XHI_CR_OFFSET 0x10C /* Control Register */
+#define XHI_SR_OFFSET 0x110 /* Status Register */
+#define XHI_WFV_OFFSET 0x114 /* Write FIFO Vacancy Register */
+#define XHI_RFO_OFFSET 0x118 /* Read FIFO Occupancy Register */
+
+/* Device Global Interrupt Enable Register (GIER) bit definitions */
+
+#define XHI_GIER_GIE_MASK 0x80000000 /* Global Interrupt enable Mask */
+
+/**
+ * HwIcap Device Interrupt Status/Enable Registers
+ *
+ * Interrupt Status Register (IPISR) : This register holds the
+ * interrupt status flags for the device. These bits are toggle on
+ * write.
+ *
+ * Interrupt Enable Register (IPIER) : This register is used to enable
+ * interrupt sources for the device.
+ * Writing a '1' to a bit enables the corresponding interrupt.
+ * Writing a '0' to a bit disables the corresponding interrupt.
+ *
+ * IPISR/IPIER registers have the same bit definitions and are only defined
+ * once.
+ */
+#define XHI_IPIXR_RFULL_MASK 0x00000008 /* Read FIFO Full */
+#define XHI_IPIXR_WEMPTY_MASK 0x00000004 /* Write FIFO Empty */
+#define XHI_IPIXR_RDP_MASK 0x00000002 /* Read FIFO half full */
+#define XHI_IPIXR_WRP_MASK 0x00000001 /* Write FIFO half full */
+#define XHI_IPIXR_ALL_MASK 0x0000000F /* Mask of all interrupts */
+
+/* Control Register (CR) */
+#define XHI_CR_SW_RESET_MASK 0x00000008 /* SW Reset Mask */
+#define XHI_CR_FIFO_CLR_MASK 0x00000004 /* FIFO Clear Mask */
+#define XHI_CR_READ_MASK 0x00000002 /* Read from ICAP to FIFO */
+#define XHI_CR_WRITE_MASK 0x00000001 /* Write from FIFO to ICAP */
+
+/* Status Register (SR) */
+#define XHI_SR_CFGERR_N_MASK 0x00000100 /* Config Error Mask */
+#define XHI_SR_DALIGN_MASK 0x00000080 /* Data Alignment Mask */
+#define XHI_SR_RIP_MASK 0x00000040 /* Read back Mask */
+#define XHI_SR_IN_ABORT_N_MASK 0x00000020 /* Select Map Abort Mask */
+#define XHI_SR_DONE_MASK 0x00000001 /* Done bit Mask  */
+
+
+#define XHI_WFO_MAX_VACANCY 1024 /* Max Write FIFO Vacancy, in words */
+#define XHI_RFO_MAX_OCCUPANCY 256 /* Max Read FIFO Occupancy, in words */
+/* The maximum amount we can request from fifo_icap_get_configuration
+   at once, in bytes. */
+#define XHI_MAX_READ_TRANSACTION_WORDS 0xFFF
+
+
+/**
+ * fifo_icap_fifo_write: Write data to the write FIFO.
+ * @parameter drvdata: a pointer to the drvdata.
+ * @parameter data: the 32-bit value to be written to the FIFO.
+ *
+ * This function will silently fail if the fifo is full.
+ **/
+static inline void fifo_icap_fifo_write(struct hwicap_drvdata *drvdata,
+		u32 data)
+{
+	dev_dbg(drvdata->dev, "fifo_write: %x\n", data);
+	out_be32(drvdata->base_address + XHI_WF_OFFSET, data);
+}
+
+/**
+ * fifo_icap_fifo_read: Read data from the Read FIFO.
+ * @parameter drvdata: a pointer to the drvdata.
+ *
+ * This function will silently fail if the fifo is empty.
+ **/
+static inline u32 fifo_icap_fifo_read(struct hwicap_drvdata *drvdata)
+{
+	u32 data = in_be32(drvdata->base_address + XHI_RF_OFFSET);
+	dev_dbg(drvdata->dev, "fifo_read: %x\n", data);
+	return data;
+}
+
+/**
+ * fifo_icap_set_read_size: Set the the size register.
+ * @parameter drvdata: a pointer to the drvdata.
+ * @parameter data: the size of the following read transaction, in words.
+ **/
+static inline void fifo_icap_set_read_size(struct hwicap_drvdata *drvdata,
+		u32 data)
+{
+	out_be32(drvdata->base_address + XHI_SZ_OFFSET, data);
+}
+
+/**
+ * fifo_icap_start_config: Initiate a configuration (write) to the device.
+ * @parameter drvdata: a pointer to the drvdata.
+ **/
+static inline void fifo_icap_start_config(struct hwicap_drvdata *drvdata)
+{
+	out_be32(drvdata->base_address + XHI_CR_OFFSET, XHI_CR_WRITE_MASK);
+	dev_dbg(drvdata->dev, "configuration started\n");
+}
+
+/**
+ * fifo_icap_start_readback: Initiate a readback from the device.
+ * @parameter drvdata: a pointer to the drvdata.
+ **/
+static inline void fifo_icap_start_readback(struct hwicap_drvdata *drvdata)
+{
+	out_be32(drvdata->base_address + XHI_CR_OFFSET, XHI_CR_READ_MASK);
+	dev_dbg(drvdata->dev, "readback started\n");
+}
+
+/**
+ * fifo_icap_busy: Return true if the ICAP is still processing a transaction.
+ * @parameter drvdata: a pointer to the drvdata.
+ **/
+static inline u32 fifo_icap_busy(struct hwicap_drvdata *drvdata)
+{
+	u32 status = in_be32(drvdata->base_address + XHI_SR_OFFSET);
+	dev_dbg(drvdata->dev, "Getting status = %x\n", status);
+	return (status & XHI_SR_DONE_MASK) ? 0 : 1;
+}
+
+/**
+ * fifo_icap_write_fifo_vacancy: Query the write fifo available space.
+ * @parameter drvdata: a pointer to the drvdata.
+ *
+ * Return the number of words that can be safely pushed into the write fifo.
+ **/
+static inline u32 fifo_icap_write_fifo_vacancy(
+		struct hwicap_drvdata *drvdata)
+{
+	return in_be32(drvdata->base_address + XHI_WFV_OFFSET);
+}
+
+/**
+ * fifo_icap_read_fifo_occupancy: Query the read fifo available data.
+ * @parameter drvdata: a pointer to the drvdata.
+ *
+ * Return the number of words that can be safely read from the read fifo.
+ **/
+static inline u32 fifo_icap_read_fifo_occupancy(
+		struct hwicap_drvdata *drvdata)
+{
+	return in_be32(drvdata->base_address + XHI_RFO_OFFSET);
+}
+
+/**
+ * fifo_icap_set_configuration: Send configuration data to the ICAP.
+ * @parameter drvdata: a pointer to the drvdata.
+ * @parameter frame_buffer: a pointer to the data to be written to the
+ *		ICAP device.
+ * @parameter num_words: the number of words (32 bit) to write to the ICAP
+ *		device.
+
+ * This function writes the given user data to the Write FIFO in
+ * polled mode and starts the transfer of the data to
+ * the ICAP device.
+ **/
+int fifo_icap_set_configuration(struct hwicap_drvdata *drvdata,
+		u32 *frame_buffer, u32 num_words)
+{
+
+	u32 write_fifo_vacancy = 0;
+	u32 retries = 0;
+	u32 remaining_words;
+
+	dev_dbg(drvdata->dev, "fifo_set_configuration\n");
+
+	/*
+	 * Check if the ICAP device is Busy with the last Read/Write
+	 */
+	if (fifo_icap_busy(drvdata))
+		return -EBUSY;
+
+	/*
+	 * Set up the buffer pointer and the words to be transferred.
+	 */
+	remaining_words = num_words;
+
+	while (remaining_words > 0) {
+		/*
+		 * Wait until we have some data in the fifo.
+		 */
+		while (write_fifo_vacancy == 0) {
+			write_fifo_vacancy =
+				fifo_icap_write_fifo_vacancy(drvdata);
+			retries++;
+			if (retries > XHI_MAX_RETRIES)
+				return -EIO;
+		}
+
+		/*
+		 * Write data into the Write FIFO.
+		 */
+		while ((write_fifo_vacancy != 0) &&
+				(remaining_words > 0)) {
+			fifo_icap_fifo_write(drvdata, *frame_buffer);
+
+			remaining_words--;
+			write_fifo_vacancy--;
+			frame_buffer++;
+		}
+		/* Start pushing whatever is in the FIFO into the ICAP. */
+		fifo_icap_start_config(drvdata);
+	}
+
+	/* Wait until the write has finished. */
+	while (fifo_icap_busy(drvdata)) {
+		retries++;
+		if (retries > XHI_MAX_RETRIES)
+			break;
+	}
+
+	dev_dbg(drvdata->dev, "done fifo_set_configuration\n");
+
+	/*
+	 * If the requested number of words have not been read from
+	 * the device then indicate failure.
+	 */
+	if (remaining_words != 0)
+		return -EIO;
+
+	return 0;
+}
+
+/**
+ * fifo_icap_get_configuration: Read configuration data from the device.
+ * @parameter drvdata: a pointer to the drvdata.
+ * @parameter data: Address of the data representing the partial bitstream
+ * @parameter size: the size of the partial bitstream in 32 bit words.
+ *
+ * This function reads the specified number of words from the ICAP device in
+ * the polled mode.
+ */
+int fifo_icap_get_configuration(struct hwicap_drvdata *drvdata,
+		u32 *frame_buffer, u32 num_words)
+{
+
+	u32 read_fifo_occupancy = 0;
+	u32 retries = 0;
+	u32 *data = frame_buffer;
+	u32 remaining_words;
+	u32 words_to_read;
+
+	dev_dbg(drvdata->dev, "fifo_get_configuration\n");
+
+	/*
+	 * Check if the ICAP device is Busy with the last Write/Read
+	 */
+	if (fifo_icap_busy(drvdata))
+		return -EBUSY;
+
+	remaining_words = num_words;
+
+	while (remaining_words > 0) {
+		words_to_read = remaining_words;
+		/* The hardware has a limit on the number of words
+		   that can be read at one time.  */
+		if (words_to_read > XHI_MAX_READ_TRANSACTION_WORDS)
+			words_to_read = XHI_MAX_READ_TRANSACTION_WORDS;
+
+		remaining_words -= words_to_read;
+
+		fifo_icap_set_read_size(drvdata, words_to_read);
+		fifo_icap_start_readback(drvdata);
+
+		while (words_to_read > 0) {
+			/* Wait until we have some data in the fifo. */
+			while (read_fifo_occupancy == 0) {
+				read_fifo_occupancy =
+					fifo_icap_read_fifo_occupancy(drvdata);
+				retries++;
+				if (retries > XHI_MAX_RETRIES)
+					return -EIO;
+			}
+
+			if (read_fifo_occupancy > words_to_read)
+				read_fifo_occupancy = words_to_read;
+
+			words_to_read -= read_fifo_occupancy;
+
+			/* Read the data from the Read FIFO. */
+			while (read_fifo_occupancy != 0) {
+				*data++ = fifo_icap_fifo_read(drvdata);
+				read_fifo_occupancy--;
+			}
+		}
+	}
+
+	dev_dbg(drvdata->dev, "done fifo_get_configuration\n");
+
+	return 0;
+}
+
+/**
+ * buffer_icap_reset: Reset the logic of the icap device.
+ * @parameter drvdata: a pointer to the drvdata.
+ *
+ * This function forces the software reset of the complete HWICAP device.
+ * All the registers will return to the default value and the FIFO is also
+ * flushed as a part of this software reset.
+ */
+void fifo_icap_reset(struct hwicap_drvdata *drvdata)
+{
+	u32 reg_data;
+	/*
+	 * Reset the device by setting/clearing the RESET bit in the
+	 * Control Register.
+	 */
+	reg_data = in_be32(drvdata->base_address + XHI_CR_OFFSET);
+
+	out_be32(drvdata->base_address + XHI_CR_OFFSET,
+				reg_data | XHI_CR_SW_RESET_MASK);
+
+	out_be32(drvdata->base_address + XHI_CR_OFFSET,
+				reg_data & (~XHI_CR_SW_RESET_MASK));
+
+}
+
+/**
+ * fifo_icap_flush_fifo: This function flushes the FIFOs in the device.
+ * @parameter drvdata: a pointer to the drvdata.
+ */
+void fifo_icap_flush_fifo(struct hwicap_drvdata *drvdata)
+{
+	u32 reg_data;
+	/*
+	 * Flush the FIFO by setting/clearing the FIFO Clear bit in the
+	 * Control Register.
+	 */
+	reg_data = in_be32(drvdata->base_address + XHI_CR_OFFSET);
+
+	out_be32(drvdata->base_address + XHI_CR_OFFSET,
+				reg_data | XHI_CR_FIFO_CLR_MASK);
+
+	out_be32(drvdata->base_address + XHI_CR_OFFSET,
+				reg_data & (~XHI_CR_FIFO_CLR_MASK));
+}
+

drivers/char/xilinx_hwicap/fifo_icap.h

···
+/*****************************************************************************
+ *
+ *     Author: 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.
+ *
+ *     XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"
+ *     AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND
+ *     SOLUTIONS FOR XILINX DEVICES.  BY PROVIDING THIS DESIGN, CODE,
+ *     OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE,
+ *     APPLICATION OR STANDARD, XILINX IS MAKING NO REPRESENTATION
+ *     THAT THIS IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT,
+ *     AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE
+ *     FOR YOUR IMPLEMENTATION.  XILINX EXPRESSLY DISCLAIMS ANY
+ *     WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE
+ *     IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR
+ *     REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF
+ *     INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ *     FOR A PARTICULAR PURPOSE.
+ *
+ *     Xilinx products are not intended for use in life support appliances,
+ *     devices, or systems. Use in such applications is expressly prohibited.
+ *
+ *     (c) Copyright 2007-2008 Xilinx Inc.
+ *     All rights reserved.
+ *
+ *     You should have received a copy of the GNU General Public License along
+ *     with this program; if not, write to the Free Software Foundation, Inc.,
+ *     675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *****************************************************************************/
+
+#ifndef XILINX_FIFO_ICAP_H_	/* prevent circular inclusions */
+#define XILINX_FIFO_ICAP_H_	/* by using protection macros */
+
+#include <linux/types.h>
+#include <linux/cdev.h>
+#include <linux/version.h>
+#include <linux/platform_device.h>
+
+#include <asm/io.h>
+#include "xilinx_hwicap.h"
+
+/* Reads integers from the device into the storage buffer. */
+int fifo_icap_get_configuration(
+		struct hwicap_drvdata *drvdata,
+		u32 *FrameBuffer,
+		u32 NumWords);
+
+/* Writes integers to the device from the storage buffer. */
+int fifo_icap_set_configuration(
+		struct hwicap_drvdata *drvdata,
+		u32 *FrameBuffer,
+		u32 NumWords);
+
+void fifo_icap_reset(struct hwicap_drvdata *drvdata);
+void fifo_icap_flush_fifo(struct hwicap_drvdata *drvdata);
+
+#endif

drivers/char/xilinx_hwicap/xilinx_hwicap.c

···
+/*****************************************************************************
+ *
+ *     Author: 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.
+ *
+ *     XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"
+ *     AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND
+ *     SOLUTIONS FOR XILINX DEVICES.  BY PROVIDING THIS DESIGN, CODE,
+ *     OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE,
+ *     APPLICATION OR STANDARD, XILINX IS MAKING NO REPRESENTATION
+ *     THAT THIS IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT,
+ *     AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE
+ *     FOR YOUR IMPLEMENTATION.  XILINX EXPRESSLY DISCLAIMS ANY
+ *     WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE
+ *     IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR
+ *     REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF
+ *     INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ *     FOR A PARTICULAR PURPOSE.
+ *
+ *     Xilinx products are not intended for use in life support appliances,
+ *     devices, or systems. Use in such applications is expressly prohibited.
+ *
+ *     (c) Copyright 2002 Xilinx Inc., Systems Engineering Group
+ *     (c) Copyright 2004 Xilinx Inc., Systems Engineering Group
+ *     (c) Copyright 2007-2008 Xilinx Inc.
+ *     All rights reserved.
+ *
+ *     You should have received a copy of the GNU General Public License along
+ *     with this program; if not, write to the Free Software Foundation, Inc.,
+ *     675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *****************************************************************************/
+
+/*
+ * This is the code behind /dev/xilinx_icap -- it allows a user-space
+ * application to use the Xilinx ICAP subsystem.
+ *
+ * The following operations are possible:
+ *
+ * open         open the port and initialize for access.
+ * release      release port
+ * write        Write a bitstream to the configuration processor.
+ * read         Read a data stream from the configuration processor.
+ *
+ * After being opened, the port is initialized and accessed to avoid a
+ * corrupted first read which may occur with some hardware.  The port
+ * is left in a desynched state, requiring that a synch sequence be
+ * transmitted before any valid configuration data.  A user will have
+ * exclusive access to the device while it remains open, and the state
+ * of the ICAP cannot be guaranteed after the device is closed.  Note
+ * that a complete reset of the core and the state of the ICAP cannot
+ * be performed on many versions of the cores, hence users of this
+ * device should avoid making inconsistent accesses to the device.  In
+ * particular, accessing the read interface, without first generating
+ * a write containing a readback packet can leave the ICAP in an
+ * inaccessible state.
+ *
+ * Note that in order to use the read interface, it is first necessary
+ * to write a request packet to the write interface.  i.e., it is not
+ * possible to simply readback the bitstream (or any configuration
+ * bits) from a device without specifically requesting them first.
+ * The code to craft such packets is intended to be part of the
+ * user-space application code that uses this device.  The simplest
+ * way to use this interface is simply:
+ *
+ * cp foo.bit /dev/xilinx_icap
+ *
+ * Note that unless foo.bit is an appropriately constructed partial
+ * bitstream, this has a high likelyhood of overwriting the design
+ * currently programmed in the FPGA.
+ */
+
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/fcntl.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <linux/proc_fs.h>
+#include <asm/semaphore.h>
+#include <linux/sysctl.h>
+#include <linux/version.h>
+#include <linux/fs.h>
+#include <linux/cdev.h>
+#include <linux/platform_device.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+#ifdef CONFIG_OF
+/* For open firmware. */
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#endif
+
+#include "xilinx_hwicap.h"
+#include "buffer_icap.h"
+#include "fifo_icap.h"
+
+#define DRIVER_NAME "xilinx_icap"
+
+#define HWICAP_REGS   (0x10000)
+
+/* dynamically allocate device number */
+static int xhwicap_major;
+static int xhwicap_minor;
+#define HWICAP_DEVICES 1
+
+module_param(xhwicap_major, int, S_IRUGO);
+module_param(xhwicap_minor, int, S_IRUGO);
+
+/* An array, which is set to true when the device is registered. */
+static bool probed_devices[HWICAP_DEVICES];
+
+static struct class *icap_class;
+
+#define UNIMPLEMENTED 0xFFFF
+
+static const struct config_registers v2_config_registers = {
+	.CRC = 0,
+	.FAR = 1,
+	.FDRI = 2,
+	.FDRO = 3,
+	.CMD = 4,
+	.CTL = 5,
+	.MASK = 6,
+	.STAT = 7,
+	.LOUT = 8,
+	.COR = 9,
+	.MFWR = 10,
+	.FLR = 11,
+	.KEY = 12,
+	.CBC = 13,
+	.IDCODE = 14,
+	.AXSS = UNIMPLEMENTED,
+	.C0R_1 = UNIMPLEMENTED,
+	.CSOB = UNIMPLEMENTED,
+	.WBSTAR = UNIMPLEMENTED,
+	.TIMER = UNIMPLEMENTED,
+	.BOOTSTS = UNIMPLEMENTED,
+	.CTL_1 = UNIMPLEMENTED,
+};
+
+static const struct config_registers v4_config_registers = {
+	.CRC = 0,
+	.FAR = 1,
+	.FDRI = 2,
+	.FDRO = 3,
+	.CMD = 4,
+	.CTL = 5,
+	.MASK = 6,
+	.STAT = 7,
+	.LOUT = 8,
+	.COR = 9,
+	.MFWR = 10,
+	.FLR = UNIMPLEMENTED,
+	.KEY = UNIMPLEMENTED,
+	.CBC = 11,
+	.IDCODE = 12,
+	.AXSS = 13,
+	.C0R_1 = UNIMPLEMENTED,
+	.CSOB = UNIMPLEMENTED,
+	.WBSTAR = UNIMPLEMENTED,
+	.TIMER = UNIMPLEMENTED,
+	.BOOTSTS = UNIMPLEMENTED,
+	.CTL_1 = UNIMPLEMENTED,
+};
+static const struct config_registers v5_config_registers = {
+	.CRC = 0,
+	.FAR = 1,
+	.FDRI = 2,
+	.FDRO = 3,
+	.CMD = 4,
+	.CTL = 5,
+	.MASK = 6,
+	.STAT = 7,
+	.LOUT = 8,
+	.COR = 9,
+	.MFWR = 10,
+	.FLR = UNIMPLEMENTED,
+	.KEY = UNIMPLEMENTED,
+	.CBC = 11,
+	.IDCODE = 12,
+	.AXSS = 13,
+	.C0R_1 = 14,
+	.CSOB = 15,
+	.WBSTAR = 16,
+	.TIMER = 17,
+	.BOOTSTS = 18,
+	.CTL_1 = 19,
+};
+
+/**
+ * hwicap_command_desync: Send a DESYNC command to the ICAP port.
+ * @parameter drvdata: a pointer to the drvdata.
+ *
+ * This command desynchronizes the ICAP After this command, a
+ * bitstream containing a NULL packet, followed by a SYNCH packet is
+ * required before the ICAP will recognize commands.
+ */
+int hwicap_command_desync(struct hwicap_drvdata *drvdata)
+{
+	u32 buffer[4];
+	u32 index = 0;
+
+	/*
+	 * Create the data to be written to the ICAP.
+	 */
+	buffer[index++] = hwicap_type_1_write(drvdata->config_regs->CMD) | 1;
+	buffer[index++] = XHI_CMD_DESYNCH;
+	buffer[index++] = XHI_NOOP_PACKET;
+	buffer[index++] = XHI_NOOP_PACKET;
+
+	/*
+	 * Write the data to the FIFO and intiate the transfer of data present
+	 * in the FIFO to the ICAP device.
+	 */
+	return drvdata->config->set_configuration(drvdata,
+			&buffer[0], index);
+}
+
+/**
+ * hwicap_command_capture: Send a CAPTURE command to the ICAP port.
+ * @parameter drvdata: a pointer to the drvdata.
+ *
+ * This command captures all of the flip flop states so they will be
+ * available during readback.  One can use this command instead of
+ * enabling the CAPTURE block in the design.
+ */
+int hwicap_command_capture(struct hwicap_drvdata *drvdata)
+{
+	u32 buffer[7];
+	u32 index = 0;
+
+	/*
+	 * Create the data to be written to the ICAP.
+	 */
+	buffer[index++] = XHI_DUMMY_PACKET;
+	buffer[index++] = XHI_SYNC_PACKET;
+	buffer[index++] = XHI_NOOP_PACKET;
+	buffer[index++] = hwicap_type_1_write(drvdata->config_regs->CMD) | 1;
+	buffer[index++] = XHI_CMD_GCAPTURE;
+	buffer[index++] = XHI_DUMMY_PACKET;
+	buffer[index++] = XHI_DUMMY_PACKET;
+
+	/*
+	 * Write the data to the FIFO and intiate the transfer of data
+	 * present in the FIFO to the ICAP device.
+	 */
+	return drvdata->config->set_configuration(drvdata,
+			&buffer[0], index);
+
+}
+
+/**
+ * hwicap_get_configuration_register: Query a configuration register.
+ * @parameter drvdata: a pointer to the drvdata.
+ * @parameter reg: a constant which represents the configuration
+ *		register value to be returned.
+ * 		Examples:  XHI_IDCODE, XHI_FLR.
+ * @parameter RegData: returns the value of the register.
+ *
+ * Sends a query packet to the ICAP and then receives the response.
+ * The icap is left in Synched state.
+ */
+int hwicap_get_configuration_register(struct hwicap_drvdata *drvdata,
+		u32 reg, u32 *RegData)
+{
+	int status;
+	u32 buffer[6];
+	u32 index = 0;
+
+	/*
+	 * Create the data to be written to the ICAP.
+	 */
+	buffer[index++] = XHI_DUMMY_PACKET;
+	buffer[index++] = XHI_SYNC_PACKET;
+	buffer[index++] = XHI_NOOP_PACKET;
+	buffer[index++] = hwicap_type_1_read(reg) | 1;
+	buffer[index++] = XHI_NOOP_PACKET;
+	buffer[index++] = XHI_NOOP_PACKET;
+
+	/*
+	 * Write the data to the FIFO and intiate the transfer of data present
+	 * in the FIFO to the ICAP device.
+	 */
+	status = drvdata->config->set_configuration(drvdata,
+			&buffer[0], index);
+	if (status)
+		return status;
+
+	/*
+	 * Read the configuration register
+	 */
+	status = drvdata->config->get_configuration(drvdata, RegData, 1);
+	if (status)
+		return status;
+
+	return 0;
+}
+
+int hwicap_initialize_hwicap(struct hwicap_drvdata *drvdata)
+{
+	int status;
+	u32 idcode;
+
+	dev_dbg(drvdata->dev, "initializing\n");
+
+	/* Abort any current transaction, to make sure we have the
+	 * ICAP in a good state. */
+	dev_dbg(drvdata->dev, "Reset...\n");
+	drvdata->config->reset(drvdata);
+
+	dev_dbg(drvdata->dev, "Desync...\n");
+	status = hwicap_command_desync(drvdata);
+	if (status)
+		return status;
+
+	/* Attempt to read the IDCODE from ICAP.  This
+	 * may not be returned correctly, due to the design of the
+	 * hardware.
+	 */
+	dev_dbg(drvdata->dev, "Reading IDCODE...\n");
+	status = hwicap_get_configuration_register(
+			drvdata, drvdata->config_regs->IDCODE, &idcode);
+	dev_dbg(drvdata->dev, "IDCODE = %x\n", idcode);
+	if (status)
+		return status;
+
+	dev_dbg(drvdata->dev, "Desync...\n");
+	status = hwicap_command_desync(drvdata);
+	if (status)
+		return status;
+
+	return 0;
+}
+
+static ssize_t
+hwicap_read(struct file *file, char *buf, size_t count, loff_t *ppos)
+{
+	struct hwicap_drvdata *drvdata = file->private_data;
+	ssize_t bytes_to_read = 0;
+	u32 *kbuf;
+	u32 words;
+	u32 bytes_remaining;
+	int status;
+
+	if (down_interruptible(&drvdata->sem))
+		return -ERESTARTSYS;
+
+	if (drvdata->read_buffer_in_use) {
+		/* If there are leftover bytes in the buffer, just */
+		/* return them and don't try to read more from the */
+		/* ICAP device. */
+		bytes_to_read =
+			(count < drvdata->read_buffer_in_use) ? count :
+			drvdata->read_buffer_in_use;
+
+		/* Return the data currently in the read buffer. */
+		if (copy_to_user(buf, drvdata->read_buffer, bytes_to_read)) {
+			status = -EFAULT;
+			goto error;
+		}
+		drvdata->read_buffer_in_use -= bytes_to_read;
+		memcpy(drvdata->read_buffer + bytes_to_read,
+				drvdata->read_buffer, 4 - bytes_to_read);
+	} else {
+		/* Get new data from the ICAP, and return was was requested. */
+		kbuf = (u32 *) get_zeroed_page(GFP_KERNEL);
+		if (!kbuf) {
+			status = -ENOMEM;
+			goto error;
+		}
+
+		/* The ICAP device is only able to read complete */
+		/* words.  If a number of bytes that do not correspond */
+		/* to complete words is requested, then we read enough */
+		/* words to get the required number of bytes, and then */
+		/* save the remaining bytes for the next read. */
+
+		/* Determine the number of words to read, rounding up */
+		/* if necessary. */
+		words = ((count + 3) >> 2);
+		bytes_to_read = words << 2;
+
+		if (bytes_to_read > PAGE_SIZE)
+			bytes_to_read = PAGE_SIZE;
+
+		/* Ensure we only read a complete number of words. */
+		bytes_remaining = bytes_to_read & 3;
+		bytes_to_read &= ~3;
+		words = bytes_to_read >> 2;
+
+		status = drvdata->config->get_configuration(drvdata,
+				kbuf, words);
+
+		/* If we didn't read correctly, then bail out. */
+		if (status) {
+			free_page((unsigned long)kbuf);
+			goto error;
+		}
+
+		/* If we fail to return the data to the user, then bail out. */
+		if (copy_to_user(buf, kbuf, bytes_to_read)) {
+			free_page((unsigned long)kbuf);
+			status = -EFAULT;
+			goto error;
+		}
+		memcpy(kbuf, drvdata->read_buffer, bytes_remaining);
+		drvdata->read_buffer_in_use = bytes_remaining;
+		free_page((unsigned long)kbuf);
+	}
+	status = bytes_to_read;
+ error:
+	up(&drvdata->sem);
+	return status;
+}
+
+static ssize_t
+hwicap_write(struct file *file, const char *buf,
+		size_t count, loff_t *ppos)
+{
+	struct hwicap_drvdata *drvdata = file->private_data;
+	ssize_t written = 0;
+	ssize_t left = count;
+	u32 *kbuf;
+	ssize_t len;
+	ssize_t status;
+
+	if (down_interruptible(&drvdata->sem))
+		return -ERESTARTSYS;
+
+	left += drvdata->write_buffer_in_use;
+
+	/* Only write multiples of 4 bytes. */
+	if (left < 4) {
+		status = 0;
+		goto error;
+	}
+
+	kbuf = (u32 *) __get_free_page(GFP_KERNEL);
+	if (!kbuf) {
+		status = -ENOMEM;
+		goto error;
+	}
+
+	while (left > 3) {
+		/* only write multiples of 4 bytes, so there might */
+		/* be as many as 3 bytes left (at the end). */
+		len = left;
+
+		if (len > PAGE_SIZE)
+			len = PAGE_SIZE;
+		len &= ~3;
+
+		if (drvdata->write_buffer_in_use) {
+			memcpy(kbuf, drvdata->write_buffer,
+					drvdata->write_buffer_in_use);
+			if (copy_from_user(
+			    (((char *)kbuf) + (drvdata->write_buffer_in_use)),
+			    buf + written,
+			    len - (drvdata->write_buffer_in_use))) {
+				free_page((unsigned long)kbuf);
+				status = -EFAULT;
+				goto error;
+			}
+		} else {
+			if (copy_from_user(kbuf, buf + written, len)) {
+				free_page((unsigned long)kbuf);
+				status = -EFAULT;
+				goto error;
+			}
+		}
+
+		status = drvdata->config->set_configuration(drvdata,
+				kbuf, len >> 2);
+
+		if (status) {
+			free_page((unsigned long)kbuf);
+			status = -EFAULT;
+			goto error;
+		}
+		if (drvdata->write_buffer_in_use) {
+			len -= drvdata->write_buffer_in_use;
+			left -= drvdata->write_buffer_in_use;
+			drvdata->write_buffer_in_use = 0;
+		}
+		written += len;
+		left -= len;
+	}
+	if ((left > 0) && (left < 4)) {
+		if (!copy_from_user(drvdata->write_buffer,
+						buf + written, left)) {
+			drvdata->write_buffer_in_use = left;
+			written += left;
+			left = 0;
+		}
+	}
+
+	free_page((unsigned long)kbuf);
+	status = written;
+ error:
+	up(&drvdata->sem);
+	return status;
+}
+
+static int hwicap_open(struct inode *inode, struct file *file)
+{
+	struct hwicap_drvdata *drvdata;
+	int status;
+
+	drvdata = container_of(inode->i_cdev, struct hwicap_drvdata, cdev);
+
+	if (down_interruptible(&drvdata->sem))
+		return -ERESTARTSYS;
+
+	if (drvdata->is_open) {
+		status = -EBUSY;
+		goto error;
+	}
+
+	status = hwicap_initialize_hwicap(drvdata);
+	if (status) {
+		dev_err(drvdata->dev, "Failed to open file");
+		goto error;
+	}
+
+	file->private_data = drvdata;
+	drvdata->write_buffer_in_use = 0;
+	drvdata->read_buffer_in_use = 0;
+	drvdata->is_open = 1;
+
+ error:
+	up(&drvdata->sem);
+	return status;
+}
+
+static int hwicap_release(struct inode *inode, struct file *file)
+{
+	struct hwicap_drvdata *drvdata = file->private_data;
+	int i;
+	int status = 0;
+
+	if (down_interruptible(&drvdata->sem))
+		return -ERESTARTSYS;
+
+	if (drvdata->write_buffer_in_use) {
+		/* Flush write buffer. */
+		for (i = drvdata->write_buffer_in_use; i < 4; i++)
+			drvdata->write_buffer[i] = 0;
+
+		status = drvdata->config->set_configuration(drvdata,
+				(u32 *) drvdata->write_buffer, 1);
+		if (status)
+			goto error;
+	}
+
+	status = hwicap_command_desync(drvdata);
+	if (status)
+		goto error;
+
+ error:
+	drvdata->is_open = 0;
+	up(&drvdata->sem);
+	return status;
+}
+
+static struct file_operations hwicap_fops = {
+	.owner = THIS_MODULE,
+	.write = hwicap_write,
+	.read = hwicap_read,
+	.open = hwicap_open,
+	.release = hwicap_release,
+};
+
+static int __devinit hwicap_setup(struct device *dev, int id,
+		const struct resource *regs_res,
+		const struct hwicap_driver_config *config,
+		const struct config_registers *config_regs)
+{
+	dev_t devt;
+	struct hwicap_drvdata *drvdata = NULL;
+	int retval = 0;
+
+	dev_info(dev, "Xilinx icap port driver\n");
+
+	if (id < 0) {
+		for (id = 0; id < HWICAP_DEVICES; id++)
+			if (!probed_devices[id])
+				break;
+	}
+	if (id < 0 || id >= HWICAP_DEVICES) {
+		dev_err(dev, "%s%i too large\n", DRIVER_NAME, id);
+		return -EINVAL;
+	}
+	if (probed_devices[id]) {
+		dev_err(dev, "cannot assign to %s%i; it is already in use\n",
+			DRIVER_NAME, id);
+		return -EBUSY;
+	}
+
+	probed_devices[id] = 1;
+
+	devt = MKDEV(xhwicap_major, xhwicap_minor + id);
+
+	drvdata = kmalloc(sizeof(struct hwicap_drvdata), GFP_KERNEL);
+	if (!drvdata) {
+		dev_err(dev, "Couldn't allocate device private record\n");
+		return -ENOMEM;
+	}
+	memset((void *)drvdata, 0, sizeof(struct hwicap_drvdata));
+	dev_set_drvdata(dev, (void *)drvdata);
+
+	if (!regs_res) {
+		dev_err(dev, "Couldn't get registers resource\n");
+		retval = -EFAULT;
+		goto failed1;
+	}
+
+	drvdata->mem_start = regs_res->start;
+	drvdata->mem_end = regs_res->end;
+	drvdata->mem_size = regs_res->end - regs_res->start + 1;
+
+	if (!request_mem_region(drvdata->mem_start,
+					drvdata->mem_size, DRIVER_NAME)) {
+		dev_err(dev, "Couldn't lock memory region at %p\n",
+			(void *)regs_res->start);
+		retval = -EBUSY;
+		goto failed1;
+	}
+
+	drvdata->devt = devt;
+	drvdata->dev = dev;
+	drvdata->base_address = ioremap(drvdata->mem_start, drvdata->mem_size);
+	if (!drvdata->base_address) {
+		dev_err(dev, "ioremap() failed\n");
+		goto failed2;
+	}
+
+	drvdata->config = config;
+	drvdata->config_regs = config_regs;
+
+	init_MUTEX(&drvdata->sem);
+	drvdata->is_open = 0;
+
+	dev_info(dev, "ioremap %lx to %p with size %x\n",
+		 (unsigned long int)drvdata->mem_start,
+			drvdata->base_address, drvdata->mem_size);
+
+	cdev_init(&drvdata->cdev, &hwicap_fops);
+	drvdata->cdev.owner = THIS_MODULE;
+	retval = cdev_add(&drvdata->cdev, devt, 1);
+	if (retval) {
+		dev_err(dev, "cdev_add() failed\n");
+		goto failed3;
+	}
+	/*  devfs_mk_cdev(devt, S_IFCHR|S_IRUGO|S_IWUGO, DRIVER_NAME); */
+	class_device_create(icap_class, NULL, devt, NULL, DRIVER_NAME);
+	return 0;		/* success */
+
+ failed3:
+	iounmap(drvdata->base_address);
+
+ failed2:
+	release_mem_region(regs_res->start, drvdata->mem_size);
+
+ failed1:
+	kfree(drvdata);
+
+	return retval;
+}
+
+static struct hwicap_driver_config buffer_icap_config = {
+	.get_configuration = buffer_icap_get_configuration,
+	.set_configuration = buffer_icap_set_configuration,
+	.reset = buffer_icap_reset,
+};
+
+static struct hwicap_driver_config fifo_icap_config = {
+	.get_configuration = fifo_icap_get_configuration,
+	.set_configuration = fifo_icap_set_configuration,
+	.reset = fifo_icap_reset,
+};
+
+static int __devexit hwicap_remove(struct device *dev)
+{
+	struct hwicap_drvdata *drvdata;
+
+	drvdata = (struct hwicap_drvdata *)dev_get_drvdata(dev);
+
+	if (!drvdata)
+		return 0;
+
+	class_device_destroy(icap_class, drvdata->devt);
+	cdev_del(&drvdata->cdev);
+	iounmap(drvdata->base_address);
+	release_mem_region(drvdata->mem_start, drvdata->mem_size);
+	kfree(drvdata);
+	dev_set_drvdata(dev, NULL);
+	probed_devices[MINOR(dev->devt)-xhwicap_minor] = 0;
+
+	return 0;		/* success */
+}
+
+static int __devinit hwicap_drv_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	const struct config_registers *regs;
+	const char *family;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENODEV;
+
+	/* It's most likely that we're using V4, if the family is not
+	   specified */
+	regs = &v4_config_registers;
+	family = pdev->dev.platform_data;
+
+	if (family) {
+		if (!strcmp(family, "virtex2p")) {
+			regs = &v2_config_registers;
+		} else if (!strcmp(family, "virtex4")) {
+			regs = &v4_config_registers;
+		} else if (!strcmp(family, "virtex5")) {
+			regs = &v5_config_registers;
+		}
+	}
+
+	return hwicap_setup(&pdev->dev, pdev->id, res,
+			&buffer_icap_config, regs);
+}
+
+static int __devexit hwicap_drv_remove(struct platform_device *pdev)
+{
+	return hwicap_remove(&pdev->dev);
+}
+
+static struct platform_driver hwicap_platform_driver = {
+	.probe = hwicap_drv_probe,
+	.remove = hwicap_drv_remove,
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = DRIVER_NAME,
+	},
+};
+
+/* ---------------------------------------------------------------------
+ * OF bus binding
+ */
+
+#if defined(CONFIG_OF)
+static int __devinit
+hwicap_of_probe(struct of_device *op, const struct of_device_id *match)
+{
+	struct resource res;
+	const unsigned int *id;
+	const char *family;
+	int rc;
+	const struct hwicap_driver_config *config = match->data;
+	const struct config_registers *regs;
+
+	dev_dbg(&op->dev, "hwicap_of_probe(%p, %p)\n", op, match);
+
+	rc = of_address_to_resource(op->node, 0, &res);
+	if (rc) {
+		dev_err(&op->dev, "invalid address\n");
+		return rc;
+	}
+
+	id = of_get_property(op->node, "port-number", NULL);
+
+	/* It's most likely that we're using V4, if the family is not
+	   specified */
+	regs = &v4_config_registers;
+	family = of_get_property(op->node, "xlnx,family", NULL);
+
+	if (family) {
+		if (!strcmp(family, "virtex2p")) {
+			regs = &v2_config_registers;
+		} else if (!strcmp(family, "virtex4")) {
+			regs = &v4_config_registers;
+		} else if (!strcmp(family, "virtex5")) {
+			regs = &v5_config_registers;
+		}
+	}
+	return hwicap_setup(&op->dev, id ? *id : -1, &res, config,
+			regs);
+}
+
+static int __devexit hwicap_of_remove(struct of_device *op)
+{
+	return hwicap_remove(&op->dev);
+}
+
+/* Match table for of_platform binding */
+static const struct of_device_id __devinit hwicap_of_match[] = {
+	{ .compatible = "xlnx,opb-hwicap-1.00.b", .data = &buffer_icap_config},
+	{ .compatible = "xlnx,xps-hwicap-1.00.a", .data = &fifo_icap_config},
+	{},
+};
+MODULE_DEVICE_TABLE(of, hwicap_of_match);
+
+static struct of_platform_driver hwicap_of_driver = {
+	.owner = THIS_MODULE,
+	.name = DRIVER_NAME,
+	.match_table = hwicap_of_match,
+	.probe = hwicap_of_probe,
+	.remove = __devexit_p(hwicap_of_remove),
+	.driver = {
+		.name = DRIVER_NAME,
+	},
+};
+
+/* Registration helpers to keep the number of #ifdefs to a minimum */
+static inline int __devinit hwicap_of_register(void)
+{
+	pr_debug("hwicap: calling of_register_platform_driver()\n");
+	return of_register_platform_driver(&hwicap_of_driver);
+}
+
+static inline void __devexit hwicap_of_unregister(void)
+{
+	of_unregister_platform_driver(&hwicap_of_driver);
+}
+#else /* CONFIG_OF */
+/* CONFIG_OF not enabled; do nothing helpers */
+static inline int __devinit hwicap_of_register(void) { return 0; }
+static inline void __devexit hwicap_of_unregister(void) { }
+#endif /* CONFIG_OF */
+
+static int __devinit hwicap_module_init(void)
+{
+	dev_t devt;
+	int retval;
+
+	icap_class = class_create(THIS_MODULE, "xilinx_config");
+
+	if (xhwicap_major) {
+		devt = MKDEV(xhwicap_major, xhwicap_minor);
+		retval = register_chrdev_region(
+				devt,
+				HWICAP_DEVICES,
+				DRIVER_NAME);
+		if (retval < 0)
+			return retval;
+	} else {
+		retval = alloc_chrdev_region(&devt,
+				xhwicap_minor,
+				HWICAP_DEVICES,
+				DRIVER_NAME);
+		if (retval < 0)
+			return retval;
+		xhwicap_major = MAJOR(devt);
+	}
+
+	retval = platform_driver_register(&hwicap_platform_driver);
+
+	if (retval)
+		goto failed1;
+
+	retval = hwicap_of_register();
+
+	if (retval)
+		goto failed2;
+
+	return retval;
+
+ failed2:
+	platform_driver_unregister(&hwicap_platform_driver);
+
+ failed1:
+	unregister_chrdev_region(devt, HWICAP_DEVICES);
+
+	return retval;
+}
+
+static void __devexit hwicap_module_cleanup(void)
+{
+	dev_t devt = MKDEV(xhwicap_major, xhwicap_minor);
+
+	class_destroy(icap_class);
+
+	platform_driver_unregister(&hwicap_platform_driver);
+
+	hwicap_of_unregister();
+
+	unregister_chrdev_region(devt, HWICAP_DEVICES);
+}
+
+module_init(hwicap_module_init);
+module_exit(hwicap_module_cleanup);
+
+MODULE_AUTHOR("Xilinx, Inc; Xilinx Research Labs Group");
+MODULE_DESCRIPTION("Xilinx ICAP Port Driver");
+MODULE_LICENSE("GPL");

drivers/char/xilinx_hwicap/xilinx_hwicap.h

···
+/*****************************************************************************
+ *
+ *     Author: 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.
+ *
+ *     XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"
+ *     AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND
+ *     SOLUTIONS FOR XILINX DEVICES.  BY PROVIDING THIS DESIGN, CODE,
+ *     OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE,
+ *     APPLICATION OR STANDARD, XILINX IS MAKING NO REPRESENTATION
+ *     THAT THIS IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT,
+ *     AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE
+ *     FOR YOUR IMPLEMENTATION.  XILINX EXPRESSLY DISCLAIMS ANY
+ *     WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE
+ *     IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR
+ *     REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF
+ *     INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ *     FOR A PARTICULAR PURPOSE.
+ *
+ *     Xilinx products are not intended for use in life support appliances,
+ *     devices, or systems. Use in such applications is expressly prohibited.
+ *
+ *     (c) Copyright 2003-2007 Xilinx Inc.
+ *     All rights reserved.
+ *
+ *     You should have received a copy of the GNU General Public License along
+ *     with this program; if not, write to the Free Software Foundation, Inc.,
+ *     675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *****************************************************************************/
+
+#ifndef XILINX_HWICAP_H_	/* prevent circular inclusions */
+#define XILINX_HWICAP_H_	/* by using protection macros */
+
+#include <linux/types.h>
+#include <linux/cdev.h>
+#include <linux/version.h>
+#include <linux/platform_device.h>
+
+#include <asm/io.h>
+
+struct hwicap_drvdata {
+	u32 write_buffer_in_use;  /* Always in [0,3] */
+	u8 write_buffer[4];
+	u32 read_buffer_in_use;	  /* Always in [0,3] */
+	u8 read_buffer[4];
+	u32 mem_start;		  /* phys. address of the control registers */
+	u32 mem_end;		  /* phys. address of the control registers */
+	u32 mem_size;
+	void __iomem *base_address;/* virt. address of the control registers */
+
+	struct device *dev;
+	struct cdev cdev;	/* Char device structure */
+	dev_t devt;
+
+	const struct hwicap_driver_config *config;
+	const struct config_registers *config_regs;
+	void *private_data;
+	bool is_open;
+	struct semaphore sem;
+};
+
+struct hwicap_driver_config {
+	int (*get_configuration)(struct hwicap_drvdata *drvdata, u32 *data,
+			u32 size);
+	int (*set_configuration)(struct hwicap_drvdata *drvdata, u32 *data,
+			u32 size);
+	void (*reset)(struct hwicap_drvdata *drvdata);
+};
+
+/* Number of times to poll the done regsiter */
+#define XHI_MAX_RETRIES     10
+
+/************ Constant Definitions *************/
+
+#define XHI_PAD_FRAMES              0x1
+
+/* Mask for calculating configuration packet headers */
+#define XHI_WORD_COUNT_MASK_TYPE_1  0x7FFUL
+#define XHI_WORD_COUNT_MASK_TYPE_2  0x1FFFFFUL
+#define XHI_TYPE_MASK               0x7
+#define XHI_REGISTER_MASK           0xF
+#define XHI_OP_MASK                 0x3
+
+#define XHI_TYPE_SHIFT              29
+#define XHI_REGISTER_SHIFT          13
+#define XHI_OP_SHIFT                27
+
+#define XHI_TYPE_1                  1
+#define XHI_TYPE_2                  2
+#define XHI_OP_WRITE                2
+#define XHI_OP_READ                 1
+
+/* Address Block Types */
+#define XHI_FAR_CLB_BLOCK           0
+#define XHI_FAR_BRAM_BLOCK          1
+#define XHI_FAR_BRAM_INT_BLOCK      2
+
+struct config_registers {
+	u32 CRC;
+	u32 FAR;
+	u32 FDRI;
+	u32 FDRO;
+	u32 CMD;
+	u32 CTL;
+	u32 MASK;
+	u32 STAT;
+	u32 LOUT;
+	u32 COR;
+	u32 MFWR;
+	u32 FLR;
+	u32 KEY;
+	u32 CBC;
+	u32 IDCODE;
+	u32 AXSS;
+	u32 C0R_1;
+	u32 CSOB;
+	u32 WBSTAR;
+	u32 TIMER;
+	u32 BOOTSTS;
+	u32 CTL_1;
+};
+
+/* Configuration Commands */
+#define XHI_CMD_NULL                0
+#define XHI_CMD_WCFG                1
+#define XHI_CMD_MFW                 2
+#define XHI_CMD_DGHIGH              3
+#define XHI_CMD_RCFG                4
+#define XHI_CMD_START               5
+#define XHI_CMD_RCAP                6
+#define XHI_CMD_RCRC                7
+#define XHI_CMD_AGHIGH              8
+#define XHI_CMD_SWITCH              9
+#define XHI_CMD_GRESTORE            10
+#define XHI_CMD_SHUTDOWN            11
+#define XHI_CMD_GCAPTURE            12
+#define XHI_CMD_DESYNCH             13
+#define XHI_CMD_IPROG               15 /* Only in Virtex5 */
+#define XHI_CMD_CRCC                16 /* Only in Virtex5 */
+#define XHI_CMD_LTIMER              17 /* Only in Virtex5 */
+
+/* Packet constants */
+#define XHI_SYNC_PACKET             0xAA995566UL
+#define XHI_DUMMY_PACKET            0xFFFFFFFFUL
+#define XHI_NOOP_PACKET             (XHI_TYPE_1 << XHI_TYPE_SHIFT)
+#define XHI_TYPE_2_READ ((XHI_TYPE_2 << XHI_TYPE_SHIFT) | \
+			(XHI_OP_READ << XHI_OP_SHIFT))
+
+#define XHI_TYPE_2_WRITE ((XHI_TYPE_2 << XHI_TYPE_SHIFT) | \
+			(XHI_OP_WRITE << XHI_OP_SHIFT))
+
+#define XHI_TYPE2_CNT_MASK          0x07FFFFFF
+
+#define XHI_TYPE_1_PACKET_MAX_WORDS 2047UL
+#define XHI_TYPE_1_HEADER_BYTES     4
+#define XHI_TYPE_2_HEADER_BYTES     8
+
+/* Constant to use for CRC check when CRC has been disabled */
+#define XHI_DISABLED_AUTO_CRC       0x0000DEFCUL
+
+/**
+ * hwicap_type_1_read: Generates a Type 1 read packet header.
+ * @parameter: Register is the address of the register to be read back.
+ *
+ * Generates a Type 1 read packet header, which is used to indirectly
+ * read registers in the configuration logic.  This packet must then
+ * be sent through the icap device, and a return packet received with
+ * the information.
+ **/
+static inline u32 hwicap_type_1_read(u32 Register)
+{
+	return (XHI_TYPE_1 << XHI_TYPE_SHIFT) |
+		(Register << XHI_REGISTER_SHIFT) |
+		(XHI_OP_READ << XHI_OP_SHIFT);
+}
+
+/**
+ * hwicap_type_1_write: Generates a Type 1 write packet header
+ * @parameter: Register is the address of the register to be read back.
+ **/
+static inline u32 hwicap_type_1_write(u32 Register)
+{
+	return (XHI_TYPE_1 << XHI_TYPE_SHIFT) |
+		(Register << XHI_REGISTER_SHIFT) |
+		(XHI_OP_WRITE << XHI_OP_SHIFT);
+}
+
+#endif

drivers/serial/uartlite.c

···
 #include <linux/tty.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
+#include <linux/init.h>
 #include <asm/io.h>
 #if defined(CONFIG_OF)
+#include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/of_platform.h>
+
+/* Match table for of_platform binding */
+static struct of_device_id ulite_of_match[] __devinitdata = {
+	{ .compatible = "xlnx,opb-uartlite-1.00.b", },
+	{ .compatible = "xlnx,xps-uartlite-1.00.a", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, ulite_of_match);
+
 #endif
 
 #define ULITE_NAME		"ttyUL"
···
 
 static int ulite_request_port(struct uart_port *port)
 {
+	pr_debug("ulite console: port=%p; port->mapbase=%x\n",
+		 port, port->mapbase);
+
 	if (!request_mem_region(port->mapbase, ULITE_REGION, "uartlite")) {
 		dev_err(port->dev, "Memory region busy\n");
 		return -EBUSY;
···
 		spin_unlock_irqrestore(&port->lock, flags);
 }
 
-#if defined(CONFIG_OF)
-static inline void __init ulite_console_of_find_device(int id)
-{
-	struct device_node *np;
-	struct resource res;
-	const unsigned int *of_id;
-	int rc;
-
-	for_each_compatible_node(np, NULL, "xilinx,uartlite") {
-		of_id = of_get_property(np, "port-number", NULL);
-		if ((!of_id) || (*of_id != id))
-			continue;
-
-		rc = of_address_to_resource(np, 0, &res);
-		if (rc)
-			continue;
-
-		ulite_ports[id].mapbase = res.start;
-		of_node_put(np);
-		return;
-	}
-}
-#else /* CONFIG_OF */
-static inline void __init ulite_console_of_find_device(int id) { /* do nothing */ }
-#endif /* CONFIG_OF */
-
 static int __init ulite_console_setup(struct console *co, char *options)
 {
 	struct uart_port *port;
···
 
 	port = &ulite_ports[co->index];
 
-	/* Check if it is an OF device */
-	if (!port->mapbase)
-		ulite_console_of_find_device(co->index);
-
-	/* Do we have a device now? */
+	/* Has the device been initialized yet? */
 	if (!port->mapbase) {
 		pr_debug("console on ttyUL%i not present\n", co->index);
 		return -ENODEV;
···
 {
 	return ulite_release(&op->dev);
 }
-
-/* Match table for of_platform binding */
-static struct of_device_id __devinit ulite_of_match[] = {
-	{ .type = "serial", .compatible = "xilinx,uartlite", },
-	{},
-};
-MODULE_DEVICE_TABLE(of, ulite_of_match);
 
 static struct of_platform_driver ulite_of_driver = {
 	.owner = THIS_MODULE,

drivers/video/xilinxfb.c

···
 }
 
 /* Match table for of_platform binding */
-static struct of_device_id __devinit xilinxfb_of_match[] = {
-	{ .compatible = "xilinx,ml300-fb", },
+static struct of_device_id xilinxfb_of_match[] __devinitdata = {
+	{ .compatible = "xlnx,plb-tft-cntlr-ref-1.00.a", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, xilinxfb_of_match);