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897 lines
22 KiB
897 lines
22 KiB
/***************************************************************************** |
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* |
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* Author: Xilinx, Inc. |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License as published by the |
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* Free Software Foundation; either version 2 of the License, or (at your |
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* option) any later version. |
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* |
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* XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS" |
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* AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND |
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* SOLUTIONS FOR XILINX DEVICES. BY PROVIDING THIS DESIGN, CODE, |
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* OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE, |
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* APPLICATION OR STANDARD, XILINX IS MAKING NO REPRESENTATION |
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* THAT THIS IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT, |
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* AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE |
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* FOR YOUR IMPLEMENTATION. XILINX EXPRESSLY DISCLAIMS ANY |
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* WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE |
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* IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR |
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* REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF |
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* INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE. |
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* |
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* (c) Copyright 2002 Xilinx Inc., Systems Engineering Group |
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* (c) Copyright 2004 Xilinx Inc., Systems Engineering Group |
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* (c) Copyright 2007-2008 Xilinx Inc. |
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* All rights reserved. |
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* |
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* You should have received a copy of the GNU General Public License along |
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* with this program; if not, write to the Free Software Foundation, Inc., |
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* 675 Mass Ave, Cambridge, MA 02139, USA. |
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* |
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*****************************************************************************/ |
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|
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/* |
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* This is the code behind /dev/icap* -- it allows a user-space |
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* application to use the Xilinx ICAP subsystem. |
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* |
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* The following operations are possible: |
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* |
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* open open the port and initialize for access. |
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* release release port |
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* write Write a bitstream to the configuration processor. |
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* read Read a data stream from the configuration processor. |
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* |
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* After being opened, the port is initialized and accessed to avoid a |
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* corrupted first read which may occur with some hardware. The port |
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* is left in a desynched state, requiring that a synch sequence be |
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* transmitted before any valid configuration data. A user will have |
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* exclusive access to the device while it remains open, and the state |
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* of the ICAP cannot be guaranteed after the device is closed. Note |
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* that a complete reset of the core and the state of the ICAP cannot |
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* be performed on many versions of the cores, hence users of this |
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* device should avoid making inconsistent accesses to the device. In |
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* particular, accessing the read interface, without first generating |
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* a write containing a readback packet can leave the ICAP in an |
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* inaccessible state. |
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* |
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* Note that in order to use the read interface, it is first necessary |
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* to write a request packet to the write interface. i.e., it is not |
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* possible to simply readback the bitstream (or any configuration |
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* bits) from a device without specifically requesting them first. |
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* The code to craft such packets is intended to be part of the |
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* user-space application code that uses this device. The simplest |
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* way to use this interface is simply: |
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* |
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* cp foo.bit /dev/icap0 |
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* |
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* Note that unless foo.bit is an appropriately constructed partial |
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* bitstream, this has a high likelihood of overwriting the design |
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* currently programmed in the FPGA. |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/types.h> |
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#include <linux/ioport.h> |
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#include <linux/interrupt.h> |
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#include <linux/fcntl.h> |
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#include <linux/init.h> |
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#include <linux/poll.h> |
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#include <linux/proc_fs.h> |
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#include <linux/mutex.h> |
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#include <linux/sysctl.h> |
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#include <linux/fs.h> |
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#include <linux/cdev.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#include <linux/io.h> |
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#include <linux/uaccess.h> |
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|
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#ifdef CONFIG_OF |
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/* For open firmware. */ |
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#include <linux/of_address.h> |
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#include <linux/of_device.h> |
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#include <linux/of_platform.h> |
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#endif |
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|
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#include "xilinx_hwicap.h" |
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#include "buffer_icap.h" |
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#include "fifo_icap.h" |
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|
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#define DRIVER_NAME "icap" |
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|
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#define HWICAP_REGS (0x10000) |
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|
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#define XHWICAP_MAJOR 259 |
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#define XHWICAP_MINOR 0 |
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#define HWICAP_DEVICES 1 |
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|
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/* An array, which is set to true when the device is registered. */ |
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static DEFINE_MUTEX(hwicap_mutex); |
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static bool probed_devices[HWICAP_DEVICES]; |
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static struct mutex icap_sem; |
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|
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static struct class *icap_class; |
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|
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#define UNIMPLEMENTED 0xFFFF |
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|
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static const struct config_registers v2_config_registers = { |
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.CRC = 0, |
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.FAR = 1, |
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.FDRI = 2, |
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.FDRO = 3, |
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.CMD = 4, |
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.CTL = 5, |
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.MASK = 6, |
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.STAT = 7, |
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.LOUT = 8, |
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.COR = 9, |
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.MFWR = 10, |
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.FLR = 11, |
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.KEY = 12, |
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.CBC = 13, |
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.IDCODE = 14, |
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.AXSS = UNIMPLEMENTED, |
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.C0R_1 = UNIMPLEMENTED, |
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.CSOB = UNIMPLEMENTED, |
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.WBSTAR = UNIMPLEMENTED, |
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.TIMER = UNIMPLEMENTED, |
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.BOOTSTS = UNIMPLEMENTED, |
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.CTL_1 = UNIMPLEMENTED, |
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}; |
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|
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static const struct config_registers v4_config_registers = { |
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.CRC = 0, |
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.FAR = 1, |
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.FDRI = 2, |
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.FDRO = 3, |
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.CMD = 4, |
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.CTL = 5, |
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.MASK = 6, |
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.STAT = 7, |
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.LOUT = 8, |
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.COR = 9, |
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.MFWR = 10, |
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.FLR = UNIMPLEMENTED, |
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.KEY = UNIMPLEMENTED, |
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.CBC = 11, |
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.IDCODE = 12, |
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.AXSS = 13, |
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.C0R_1 = UNIMPLEMENTED, |
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.CSOB = UNIMPLEMENTED, |
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.WBSTAR = UNIMPLEMENTED, |
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.TIMER = UNIMPLEMENTED, |
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.BOOTSTS = UNIMPLEMENTED, |
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.CTL_1 = UNIMPLEMENTED, |
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}; |
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static const struct config_registers v5_config_registers = { |
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.CRC = 0, |
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.FAR = 1, |
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.FDRI = 2, |
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.FDRO = 3, |
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.CMD = 4, |
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.CTL = 5, |
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.MASK = 6, |
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.STAT = 7, |
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.LOUT = 8, |
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.COR = 9, |
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.MFWR = 10, |
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.FLR = UNIMPLEMENTED, |
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.KEY = UNIMPLEMENTED, |
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.CBC = 11, |
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.IDCODE = 12, |
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.AXSS = 13, |
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.C0R_1 = 14, |
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.CSOB = 15, |
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.WBSTAR = 16, |
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.TIMER = 17, |
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.BOOTSTS = 18, |
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.CTL_1 = 19, |
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}; |
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static const struct config_registers v6_config_registers = { |
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.CRC = 0, |
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.FAR = 1, |
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.FDRI = 2, |
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.FDRO = 3, |
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.CMD = 4, |
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.CTL = 5, |
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.MASK = 6, |
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.STAT = 7, |
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.LOUT = 8, |
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.COR = 9, |
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.MFWR = 10, |
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.FLR = UNIMPLEMENTED, |
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.KEY = UNIMPLEMENTED, |
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.CBC = 11, |
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.IDCODE = 12, |
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.AXSS = 13, |
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.C0R_1 = 14, |
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.CSOB = 15, |
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.WBSTAR = 16, |
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.TIMER = 17, |
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.BOOTSTS = 22, |
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.CTL_1 = 24, |
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}; |
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/** |
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* hwicap_command_desync - Send a DESYNC command to the ICAP port. |
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* @drvdata: a pointer to the drvdata. |
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* |
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* Returns: '0' on success and failure value on error |
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* |
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* This command desynchronizes the ICAP After this command, a |
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* bitstream containing a NULL packet, followed by a SYNCH packet is |
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* required before the ICAP will recognize commands. |
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*/ |
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static int hwicap_command_desync(struct hwicap_drvdata *drvdata) |
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{ |
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u32 buffer[4]; |
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u32 index = 0; |
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|
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/* |
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* Create the data to be written to the ICAP. |
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*/ |
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buffer[index++] = hwicap_type_1_write(drvdata->config_regs->CMD) | 1; |
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buffer[index++] = XHI_CMD_DESYNCH; |
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buffer[index++] = XHI_NOOP_PACKET; |
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buffer[index++] = XHI_NOOP_PACKET; |
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/* |
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* Write the data to the FIFO and intiate the transfer of data present |
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* in the FIFO to the ICAP device. |
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*/ |
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return drvdata->config->set_configuration(drvdata, |
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&buffer[0], index); |
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} |
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|
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/** |
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* hwicap_get_configuration_register - Query a configuration register. |
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* @drvdata: a pointer to the drvdata. |
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* @reg: a constant which represents the configuration |
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* register value to be returned. |
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* Examples: XHI_IDCODE, XHI_FLR. |
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* @reg_data: returns the value of the register. |
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* |
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* Returns: '0' on success and failure value on error |
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* |
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* Sends a query packet to the ICAP and then receives the response. |
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* The icap is left in Synched state. |
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*/ |
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static int hwicap_get_configuration_register(struct hwicap_drvdata *drvdata, |
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u32 reg, u32 *reg_data) |
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{ |
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int status; |
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u32 buffer[6]; |
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u32 index = 0; |
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|
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/* |
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* Create the data to be written to the ICAP. |
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*/ |
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buffer[index++] = XHI_DUMMY_PACKET; |
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buffer[index++] = XHI_NOOP_PACKET; |
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buffer[index++] = XHI_SYNC_PACKET; |
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buffer[index++] = XHI_NOOP_PACKET; |
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buffer[index++] = XHI_NOOP_PACKET; |
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|
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/* |
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* Write the data to the FIFO and initiate the transfer of data present |
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* in the FIFO to the ICAP device. |
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*/ |
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status = drvdata->config->set_configuration(drvdata, |
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&buffer[0], index); |
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if (status) |
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return status; |
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|
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/* If the syncword was not found, then we need to start over. */ |
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status = drvdata->config->get_status(drvdata); |
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if ((status & XHI_SR_DALIGN_MASK) != XHI_SR_DALIGN_MASK) |
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return -EIO; |
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index = 0; |
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buffer[index++] = hwicap_type_1_read(reg) | 1; |
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buffer[index++] = XHI_NOOP_PACKET; |
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buffer[index++] = XHI_NOOP_PACKET; |
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/* |
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* Write the data to the FIFO and intiate the transfer of data present |
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* in the FIFO to the ICAP device. |
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*/ |
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status = drvdata->config->set_configuration(drvdata, |
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&buffer[0], index); |
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if (status) |
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return status; |
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/* |
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* Read the configuration register |
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*/ |
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status = drvdata->config->get_configuration(drvdata, reg_data, 1); |
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if (status) |
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return status; |
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return 0; |
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} |
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static int hwicap_initialize_hwicap(struct hwicap_drvdata *drvdata) |
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{ |
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int status; |
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u32 idcode; |
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dev_dbg(drvdata->dev, "initializing\n"); |
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|
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/* Abort any current transaction, to make sure we have the |
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* ICAP in a good state. |
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*/ |
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dev_dbg(drvdata->dev, "Reset...\n"); |
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drvdata->config->reset(drvdata); |
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dev_dbg(drvdata->dev, "Desync...\n"); |
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status = hwicap_command_desync(drvdata); |
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if (status) |
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return status; |
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/* Attempt to read the IDCODE from ICAP. This |
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* may not be returned correctly, due to the design of the |
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* hardware. |
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*/ |
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dev_dbg(drvdata->dev, "Reading IDCODE...\n"); |
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status = hwicap_get_configuration_register( |
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drvdata, drvdata->config_regs->IDCODE, &idcode); |
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dev_dbg(drvdata->dev, "IDCODE = %x\n", idcode); |
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if (status) |
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return status; |
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dev_dbg(drvdata->dev, "Desync...\n"); |
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status = hwicap_command_desync(drvdata); |
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if (status) |
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return status; |
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return 0; |
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} |
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static ssize_t |
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hwicap_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) |
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{ |
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struct hwicap_drvdata *drvdata = file->private_data; |
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ssize_t bytes_to_read = 0; |
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u32 *kbuf; |
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u32 words; |
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u32 bytes_remaining; |
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int status; |
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|
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status = mutex_lock_interruptible(&drvdata->sem); |
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if (status) |
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return status; |
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|
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if (drvdata->read_buffer_in_use) { |
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/* If there are leftover bytes in the buffer, just */ |
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/* return them and don't try to read more from the */ |
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/* ICAP device. */ |
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bytes_to_read = |
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(count < drvdata->read_buffer_in_use) ? count : |
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drvdata->read_buffer_in_use; |
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|
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/* Return the data currently in the read buffer. */ |
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if (copy_to_user(buf, drvdata->read_buffer, bytes_to_read)) { |
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status = -EFAULT; |
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goto error; |
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} |
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drvdata->read_buffer_in_use -= bytes_to_read; |
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memmove(drvdata->read_buffer, |
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drvdata->read_buffer + bytes_to_read, |
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4 - bytes_to_read); |
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} else { |
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/* Get new data from the ICAP, and return was was requested. */ |
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kbuf = (u32 *) get_zeroed_page(GFP_KERNEL); |
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if (!kbuf) { |
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status = -ENOMEM; |
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goto error; |
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} |
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|
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/* The ICAP device is only able to read complete */ |
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/* words. If a number of bytes that do not correspond */ |
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/* to complete words is requested, then we read enough */ |
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/* words to get the required number of bytes, and then */ |
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/* save the remaining bytes for the next read. */ |
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|
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/* Determine the number of words to read, rounding up */ |
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/* if necessary. */ |
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words = ((count + 3) >> 2); |
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bytes_to_read = words << 2; |
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|
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if (bytes_to_read > PAGE_SIZE) |
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bytes_to_read = PAGE_SIZE; |
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|
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/* Ensure we only read a complete number of words. */ |
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bytes_remaining = bytes_to_read & 3; |
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bytes_to_read &= ~3; |
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words = bytes_to_read >> 2; |
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|
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status = drvdata->config->get_configuration(drvdata, |
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kbuf, words); |
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|
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/* If we didn't read correctly, then bail out. */ |
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if (status) { |
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free_page((unsigned long)kbuf); |
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goto error; |
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} |
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|
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/* If we fail to return the data to the user, then bail out. */ |
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if (copy_to_user(buf, kbuf, bytes_to_read)) { |
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free_page((unsigned long)kbuf); |
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status = -EFAULT; |
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goto error; |
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} |
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memcpy(drvdata->read_buffer, |
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kbuf, |
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bytes_remaining); |
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drvdata->read_buffer_in_use = bytes_remaining; |
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free_page((unsigned long)kbuf); |
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} |
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status = bytes_to_read; |
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error: |
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mutex_unlock(&drvdata->sem); |
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return status; |
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} |
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static ssize_t |
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hwicap_write(struct file *file, const char __user *buf, |
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size_t count, loff_t *ppos) |
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{ |
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struct hwicap_drvdata *drvdata = file->private_data; |
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ssize_t written = 0; |
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ssize_t left = count; |
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u32 *kbuf; |
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ssize_t len; |
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ssize_t status; |
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|
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status = mutex_lock_interruptible(&drvdata->sem); |
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if (status) |
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return status; |
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|
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left += drvdata->write_buffer_in_use; |
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|
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/* Only write multiples of 4 bytes. */ |
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if (left < 4) { |
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status = 0; |
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goto error; |
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} |
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|
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kbuf = (u32 *) __get_free_page(GFP_KERNEL); |
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if (!kbuf) { |
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status = -ENOMEM; |
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goto error; |
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} |
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|
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while (left > 3) { |
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/* only write multiples of 4 bytes, so there might */ |
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/* be as many as 3 bytes left (at the end). */ |
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len = left; |
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|
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if (len > PAGE_SIZE) |
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len = PAGE_SIZE; |
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len &= ~3; |
|
|
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if (drvdata->write_buffer_in_use) { |
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memcpy(kbuf, drvdata->write_buffer, |
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drvdata->write_buffer_in_use); |
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if (copy_from_user( |
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(((char *)kbuf) + drvdata->write_buffer_in_use), |
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buf + written, |
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len - (drvdata->write_buffer_in_use))) { |
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free_page((unsigned long)kbuf); |
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status = -EFAULT; |
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goto error; |
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} |
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} else { |
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if (copy_from_user(kbuf, buf + written, len)) { |
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free_page((unsigned long)kbuf); |
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status = -EFAULT; |
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goto error; |
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} |
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} |
|
|
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status = drvdata->config->set_configuration(drvdata, |
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kbuf, len >> 2); |
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|
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if (status) { |
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free_page((unsigned long)kbuf); |
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status = -EFAULT; |
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goto error; |
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} |
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if (drvdata->write_buffer_in_use) { |
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len -= drvdata->write_buffer_in_use; |
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left -= drvdata->write_buffer_in_use; |
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drvdata->write_buffer_in_use = 0; |
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} |
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written += len; |
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left -= len; |
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} |
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if ((left > 0) && (left < 4)) { |
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if (!copy_from_user(drvdata->write_buffer, |
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buf + written, left)) { |
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drvdata->write_buffer_in_use = left; |
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written += left; |
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left = 0; |
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} |
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} |
|
|
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free_page((unsigned long)kbuf); |
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status = written; |
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error: |
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mutex_unlock(&drvdata->sem); |
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return status; |
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} |
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|
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static int hwicap_open(struct inode *inode, struct file *file) |
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{ |
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struct hwicap_drvdata *drvdata; |
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int status; |
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|
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mutex_lock(&hwicap_mutex); |
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drvdata = container_of(inode->i_cdev, struct hwicap_drvdata, cdev); |
|
|
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status = mutex_lock_interruptible(&drvdata->sem); |
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if (status) |
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goto out; |
|
|
|
if (drvdata->is_open) { |
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status = -EBUSY; |
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goto error; |
|
} |
|
|
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status = hwicap_initialize_hwicap(drvdata); |
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if (status) { |
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dev_err(drvdata->dev, "Failed to open file"); |
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goto error; |
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} |
|
|
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file->private_data = drvdata; |
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drvdata->write_buffer_in_use = 0; |
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drvdata->read_buffer_in_use = 0; |
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drvdata->is_open = 1; |
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|
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error: |
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mutex_unlock(&drvdata->sem); |
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out: |
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mutex_unlock(&hwicap_mutex); |
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return status; |
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} |
|
|
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static int hwicap_release(struct inode *inode, struct file *file) |
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{ |
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struct hwicap_drvdata *drvdata = file->private_data; |
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int i; |
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int status = 0; |
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|
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mutex_lock(&drvdata->sem); |
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|
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if (drvdata->write_buffer_in_use) { |
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/* Flush write buffer. */ |
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for (i = drvdata->write_buffer_in_use; i < 4; i++) |
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drvdata->write_buffer[i] = 0; |
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|
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status = drvdata->config->set_configuration(drvdata, |
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(u32 *) drvdata->write_buffer, 1); |
|
if (status) |
|
goto error; |
|
} |
|
|
|
status = hwicap_command_desync(drvdata); |
|
if (status) |
|
goto error; |
|
|
|
error: |
|
drvdata->is_open = 0; |
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mutex_unlock(&drvdata->sem); |
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return status; |
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} |
|
|
|
static const struct file_operations hwicap_fops = { |
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.owner = THIS_MODULE, |
|
.write = hwicap_write, |
|
.read = hwicap_read, |
|
.open = hwicap_open, |
|
.release = hwicap_release, |
|
.llseek = noop_llseek, |
|
}; |
|
|
|
static int 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"); |
|
|
|
mutex_lock(&icap_sem); |
|
|
|
if (id < 0) { |
|
for (id = 0; id < HWICAP_DEVICES; id++) |
|
if (!probed_devices[id]) |
|
break; |
|
} |
|
if (id < 0 || id >= HWICAP_DEVICES) { |
|
mutex_unlock(&icap_sem); |
|
dev_err(dev, "%s%i too large\n", DRIVER_NAME, id); |
|
return -EINVAL; |
|
} |
|
if (probed_devices[id]) { |
|
mutex_unlock(&icap_sem); |
|
dev_err(dev, "cannot assign to %s%i; it is already in use\n", |
|
DRIVER_NAME, id); |
|
return -EBUSY; |
|
} |
|
|
|
probed_devices[id] = 1; |
|
mutex_unlock(&icap_sem); |
|
|
|
devt = MKDEV(XHWICAP_MAJOR, XHWICAP_MINOR + id); |
|
|
|
drvdata = kzalloc(sizeof(struct hwicap_drvdata), GFP_KERNEL); |
|
if (!drvdata) { |
|
retval = -ENOMEM; |
|
goto failed0; |
|
} |
|
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 = resource_size(regs_res); |
|
|
|
if (!request_mem_region(drvdata->mem_start, |
|
drvdata->mem_size, DRIVER_NAME)) { |
|
dev_err(dev, "Couldn't lock memory region at %Lx\n", |
|
(unsigned long long) 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"); |
|
retval = -ENOMEM; |
|
goto failed2; |
|
} |
|
|
|
drvdata->config = config; |
|
drvdata->config_regs = config_regs; |
|
|
|
mutex_init(&drvdata->sem); |
|
drvdata->is_open = 0; |
|
|
|
dev_info(dev, "ioremap %llx to %p with size %llx\n", |
|
(unsigned long long) drvdata->mem_start, |
|
drvdata->base_address, |
|
(unsigned long long) 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; |
|
} |
|
|
|
device_create(icap_class, dev, devt, NULL, "%s%d", DRIVER_NAME, id); |
|
return 0; /* success */ |
|
|
|
failed3: |
|
iounmap(drvdata->base_address); |
|
|
|
failed2: |
|
release_mem_region(regs_res->start, drvdata->mem_size); |
|
|
|
failed1: |
|
kfree(drvdata); |
|
|
|
failed0: |
|
mutex_lock(&icap_sem); |
|
probed_devices[id] = 0; |
|
mutex_unlock(&icap_sem); |
|
|
|
return retval; |
|
} |
|
|
|
static struct hwicap_driver_config buffer_icap_config = { |
|
.get_configuration = buffer_icap_get_configuration, |
|
.set_configuration = buffer_icap_set_configuration, |
|
.get_status = buffer_icap_get_status, |
|
.reset = buffer_icap_reset, |
|
}; |
|
|
|
static struct hwicap_driver_config fifo_icap_config = { |
|
.get_configuration = fifo_icap_get_configuration, |
|
.set_configuration = fifo_icap_set_configuration, |
|
.get_status = fifo_icap_get_status, |
|
.reset = fifo_icap_reset, |
|
}; |
|
|
|
static int hwicap_remove(struct device *dev) |
|
{ |
|
struct hwicap_drvdata *drvdata; |
|
|
|
drvdata = dev_get_drvdata(dev); |
|
|
|
if (!drvdata) |
|
return 0; |
|
|
|
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); |
|
|
|
mutex_lock(&icap_sem); |
|
probed_devices[MINOR(dev->devt)-XHWICAP_MINOR] = 0; |
|
mutex_unlock(&icap_sem); |
|
return 0; /* success */ |
|
} |
|
|
|
#ifdef CONFIG_OF |
|
static int hwicap_of_probe(struct platform_device *op, |
|
const struct hwicap_driver_config *config) |
|
{ |
|
struct resource res; |
|
const unsigned int *id; |
|
const char *family; |
|
int rc; |
|
const struct config_registers *regs; |
|
|
|
|
|
rc = of_address_to_resource(op->dev.of_node, 0, &res); |
|
if (rc) { |
|
dev_err(&op->dev, "invalid address\n"); |
|
return rc; |
|
} |
|
|
|
id = of_get_property(op->dev.of_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->dev.of_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; |
|
else if (!strcmp(family, "virtex6")) |
|
regs = &v6_config_registers; |
|
} |
|
return hwicap_setup(&op->dev, id ? *id : -1, &res, config, |
|
regs); |
|
} |
|
#else |
|
static inline int hwicap_of_probe(struct platform_device *op, |
|
const struct hwicap_driver_config *config) |
|
{ |
|
return -EINVAL; |
|
} |
|
#endif /* CONFIG_OF */ |
|
|
|
static const struct of_device_id hwicap_of_match[]; |
|
static int hwicap_drv_probe(struct platform_device *pdev) |
|
{ |
|
const struct of_device_id *match; |
|
struct resource *res; |
|
const struct config_registers *regs; |
|
const char *family; |
|
|
|
match = of_match_device(hwicap_of_match, &pdev->dev); |
|
if (match) |
|
return hwicap_of_probe(pdev, match->data); |
|
|
|
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; |
|
else if (!strcmp(family, "virtex6")) |
|
regs = &v6_config_registers; |
|
} |
|
|
|
return hwicap_setup(&pdev->dev, pdev->id, res, |
|
&buffer_icap_config, regs); |
|
} |
|
|
|
static int hwicap_drv_remove(struct platform_device *pdev) |
|
{ |
|
return hwicap_remove(&pdev->dev); |
|
} |
|
|
|
#ifdef CONFIG_OF |
|
/* Match table for device tree binding */ |
|
static const struct of_device_id 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); |
|
#else |
|
#define hwicap_of_match NULL |
|
#endif |
|
|
|
static struct platform_driver hwicap_platform_driver = { |
|
.probe = hwicap_drv_probe, |
|
.remove = hwicap_drv_remove, |
|
.driver = { |
|
.name = DRIVER_NAME, |
|
.of_match_table = hwicap_of_match, |
|
}, |
|
}; |
|
|
|
static int __init hwicap_module_init(void) |
|
{ |
|
dev_t devt; |
|
int retval; |
|
|
|
icap_class = class_create(THIS_MODULE, "xilinx_config"); |
|
mutex_init(&icap_sem); |
|
|
|
devt = MKDEV(XHWICAP_MAJOR, XHWICAP_MINOR); |
|
retval = register_chrdev_region(devt, |
|
HWICAP_DEVICES, |
|
DRIVER_NAME); |
|
if (retval < 0) |
|
return retval; |
|
|
|
retval = platform_driver_register(&hwicap_platform_driver); |
|
if (retval) |
|
goto failed; |
|
|
|
return retval; |
|
|
|
failed: |
|
unregister_chrdev_region(devt, HWICAP_DEVICES); |
|
|
|
return retval; |
|
} |
|
|
|
static void __exit hwicap_module_cleanup(void) |
|
{ |
|
dev_t devt = MKDEV(XHWICAP_MAJOR, XHWICAP_MINOR); |
|
|
|
class_destroy(icap_class); |
|
|
|
platform_driver_unregister(&hwicap_platform_driver); |
|
|
|
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");
|
|
|