WSL2-Linux-Kernel/drivers/char/xilinx_hwicap/xilinx_hwicap.c

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/*****************************************************************************
*
* 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.
*
* (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/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/icap0
*
* 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/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 <linux/mutex.h>
#include <linux/sysctl.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <linux/platform_device.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 11:04:11 +03:00
#include <linux/slab.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#ifdef CONFIG_OF
/* For open firmware. */
#include <linux/of_address.h>
#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 "icap"
#define HWICAP_REGS (0x10000)
#define XHWICAP_MAJOR 259
#define XHWICAP_MINOR 0
#define HWICAP_DEVICES 1
/* An array, which is set to true when the device is registered. */
static DEFINE_MUTEX(hwicap_mutex);
static bool probed_devices[HWICAP_DEVICES];
static struct mutex icap_sem;
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.
* @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.
*/
static 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_get_configuration_register - Query a configuration register.
* @drvdata: a pointer to the drvdata.
* @reg: a constant which represents the configuration
* register value to be returned.
* Examples: XHI_IDCODE, XHI_FLR.
* @reg_data: 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.
*/
static int hwicap_get_configuration_register(struct hwicap_drvdata *drvdata,
u32 reg, u32 *reg_data)
{
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_NOOP_PACKET;
buffer[index++] = XHI_SYNC_PACKET;
buffer[index++] = XHI_NOOP_PACKET;
buffer[index++] = XHI_NOOP_PACKET;
/*
* Write the data to the FIFO and initiate 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;
/* If the syncword was not found, then we need to start over. */
status = drvdata->config->get_status(drvdata);
if ((status & XHI_SR_DALIGN_MASK) != XHI_SR_DALIGN_MASK)
return -EIO;
index = 0;
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, reg_data, 1);
if (status)
return status;
return 0;
}
static 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 __user *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;
status = mutex_lock_interruptible(&drvdata->sem);
if (status)
return status;
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;
memmove(drvdata->read_buffer,
drvdata->read_buffer + bytes_to_read,
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(drvdata->read_buffer,
kbuf,
bytes_remaining);
drvdata->read_buffer_in_use = bytes_remaining;
free_page((unsigned long)kbuf);
}
status = bytes_to_read;
error:
mutex_unlock(&drvdata->sem);
return status;
}
static ssize_t
hwicap_write(struct file *file, const char __user *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;
status = mutex_lock_interruptible(&drvdata->sem);
if (status)
return status;
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:
mutex_unlock(&drvdata->sem);
return status;
}
static int hwicap_open(struct inode *inode, struct file *file)
{
struct hwicap_drvdata *drvdata;
int status;
mutex_lock(&hwicap_mutex);
drvdata = container_of(inode->i_cdev, struct hwicap_drvdata, cdev);
status = mutex_lock_interruptible(&drvdata->sem);
if (status)
goto out;
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:
mutex_unlock(&drvdata->sem);
out:
mutex_unlock(&hwicap_mutex);
return status;
}
static int hwicap_release(struct inode *inode, struct file *file)
{
struct hwicap_drvdata *drvdata = file->private_data;
int i;
int status = 0;
mutex_lock(&drvdata->sem);
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;
mutex_unlock(&drvdata->sem);
return status;
}
static const struct file_operations hwicap_fops = {
.owner = THIS_MODULE,
.write = hwicap_write,
.read = hwicap_read,
.open = hwicap_open,
.release = hwicap_release,
llseek: automatically add .llseek fop All file_operations should get a .llseek operation so we can make nonseekable_open the default for future file operations without a .llseek pointer. The three cases that we can automatically detect are no_llseek, seq_lseek and default_llseek. For cases where we can we can automatically prove that the file offset is always ignored, we use noop_llseek, which maintains the current behavior of not returning an error from a seek. New drivers should normally not use noop_llseek but instead use no_llseek and call nonseekable_open at open time. Existing drivers can be converted to do the same when the maintainer knows for certain that no user code relies on calling seek on the device file. The generated code is often incorrectly indented and right now contains comments that clarify for each added line why a specific variant was chosen. In the version that gets submitted upstream, the comments will be gone and I will manually fix the indentation, because there does not seem to be a way to do that using coccinelle. Some amount of new code is currently sitting in linux-next that should get the same modifications, which I will do at the end of the merge window. Many thanks to Julia Lawall for helping me learn to write a semantic patch that does all this. ===== begin semantic patch ===== // This adds an llseek= method to all file operations, // as a preparation for making no_llseek the default. // // The rules are // - use no_llseek explicitly if we do nonseekable_open // - use seq_lseek for sequential files // - use default_llseek if we know we access f_pos // - use noop_llseek if we know we don't access f_pos, // but we still want to allow users to call lseek // @ open1 exists @ identifier nested_open; @@ nested_open(...) { <+... nonseekable_open(...) ...+> } @ open exists@ identifier open_f; identifier i, f; identifier open1.nested_open; @@ int open_f(struct inode *i, struct file *f) { <+... ( nonseekable_open(...) | nested_open(...) ) ...+> } @ read disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ read_no_fpos disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { ... when != off } @ write @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ write_no_fpos @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { ... when != off } @ fops0 @ identifier fops; @@ struct file_operations fops = { ... }; @ has_llseek depends on fops0 @ identifier fops0.fops; identifier llseek_f; @@ struct file_operations fops = { ... .llseek = llseek_f, ... }; @ has_read depends on fops0 @ identifier fops0.fops; identifier read_f; @@ struct file_operations fops = { ... .read = read_f, ... }; @ has_write depends on fops0 @ identifier fops0.fops; identifier write_f; @@ struct file_operations fops = { ... .write = write_f, ... }; @ has_open depends on fops0 @ identifier fops0.fops; identifier open_f; @@ struct file_operations fops = { ... .open = open_f, ... }; // use no_llseek if we call nonseekable_open //////////////////////////////////////////// @ nonseekable1 depends on !has_llseek && has_open @ identifier fops0.fops; identifier nso ~= "nonseekable_open"; @@ struct file_operations fops = { ... .open = nso, ... +.llseek = no_llseek, /* nonseekable */ }; @ nonseekable2 depends on !has_llseek @ identifier fops0.fops; identifier open.open_f; @@ struct file_operations fops = { ... .open = open_f, ... +.llseek = no_llseek, /* open uses nonseekable */ }; // use seq_lseek for sequential files ///////////////////////////////////// @ seq depends on !has_llseek @ identifier fops0.fops; identifier sr ~= "seq_read"; @@ struct file_operations fops = { ... .read = sr, ... +.llseek = seq_lseek, /* we have seq_read */ }; // use default_llseek if there is a readdir /////////////////////////////////////////// @ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier readdir_e; @@ // any other fop is used that changes pos struct file_operations fops = { ... .readdir = readdir_e, ... +.llseek = default_llseek, /* readdir is present */ }; // use default_llseek if at least one of read/write touches f_pos ///////////////////////////////////////////////////////////////// @ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read.read_f; @@ // read fops use offset struct file_operations fops = { ... .read = read_f, ... +.llseek = default_llseek, /* read accesses f_pos */ }; @ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, ... + .llseek = default_llseek, /* write accesses f_pos */ }; // Use noop_llseek if neither read nor write accesses f_pos /////////////////////////////////////////////////////////// @ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; identifier write_no_fpos.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, .read = read_f, ... +.llseek = noop_llseek, /* read and write both use no f_pos */ }; @ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write_no_fpos.write_f; @@ struct file_operations fops = { ... .write = write_f, ... +.llseek = noop_llseek, /* write uses no f_pos */ }; @ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; @@ struct file_operations fops = { ... .read = read_f, ... +.llseek = noop_llseek, /* read uses no f_pos */ }; @ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; @@ struct file_operations fops = { ... +.llseek = noop_llseek, /* no read or write fn */ }; ===== End semantic patch ===== Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Julia Lawall <julia@diku.dk> Cc: Christoph Hellwig <hch@infradead.org>
2010-08-15 20:52:59 +04:00
.llseek = noop_llseek,
};
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");
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) {
dev_err(dev, "Couldn't allocate device private record\n");
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 = 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 %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");
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 __devexit hwicap_remove(struct device *dev)
{
struct hwicap_drvdata *drvdata;
drvdata = (struct hwicap_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);
dev_set_drvdata(dev, NULL);
mutex_lock(&icap_sem);
probed_devices[MINOR(dev->devt)-XHWICAP_MINOR] = 0;
mutex_unlock(&icap_sem);
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 platform_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->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;
}
}
return hwicap_setup(&op->dev, id ? *id : -1, &res, config,
regs);
}
static int __devexit hwicap_of_remove(struct platform_device *op)
{
return hwicap_remove(&op->dev);
}
/* Match table for of_platform binding */
static const struct of_device_id __devinitconst 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 = {
.probe = hwicap_of_probe,
.remove = __devexit_p(hwicap_of_remove),
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
.of_match_table = hwicap_of_match,
},
};
/* Registration helpers to keep the number of #ifdefs to a minimum */
static inline int __init hwicap_of_register(void)
{
pr_debug("hwicap: calling of_register_platform_driver()\n");
return of_register_platform_driver(&hwicap_of_driver);
}
static inline void __exit hwicap_of_unregister(void)
{
of_unregister_platform_driver(&hwicap_of_driver);
}
#else /* CONFIG_OF */
/* CONFIG_OF not enabled; do nothing helpers */
static inline int __init hwicap_of_register(void) { return 0; }
static inline void __exit hwicap_of_unregister(void) { }
#endif /* CONFIG_OF */
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 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 __exit 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");