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/*
* Xilinx XLNK Engine Driver
*
* Copyright (C) 2010 Xilinx, Inc. All rights reserved.
*
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/spinlock_types.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/mutex.h>
#include <linux/string.h>
#include <linux/uio_driver.h>
#include "xlnk-eng.h"
static DEFINE_MUTEX(xlnk_eng_list_mutex);
static LIST_HEAD(xlnk_eng_list);
int xlnk_eng_register_device(struct xlnk_eng_device *xlnk_dev)
{
mutex_lock(&xlnk_eng_list_mutex);
/* todo: need to add more error checking */
list_add_tail(&xlnk_dev->global_node, &xlnk_eng_list);
mutex_unlock(&xlnk_eng_list_mutex);
return 0;
}
EXPORT_SYMBOL(xlnk_eng_register_device);
void xlnk_eng_unregister_device(struct xlnk_eng_device *xlnk_dev)
{
mutex_lock(&xlnk_eng_list_mutex);
/* todo: need to add more error checking */
list_del(&xlnk_dev->global_node);
mutex_unlock(&xlnk_eng_list_mutex);
}
EXPORT_SYMBOL(xlnk_eng_unregister_device);
struct xlnk_eng_device *xlnk_eng_request_by_name(char *name)
{
struct xlnk_eng_device *device, *_d;
int found = 0;
mutex_lock(&xlnk_eng_list_mutex);
list_for_each_entry_safe(device, _d, &xlnk_eng_list, global_node) {
if (!strcmp(dev_name(device->dev), name)) {
found = 1;
break;
}
}
if (found)
device = device->alloc(device);
else
device = NULL;
mutex_unlock(&xlnk_eng_list_mutex);
return device;
}
EXPORT_SYMBOL(xlnk_eng_request_by_name);
/**
* struct xilinx_xlnk_eng_device - device structure for xilinx_xlnk_eng
* @common: common device info
* @base: base address for device
* @lock: lock used by device
* @cnt: usage count
* @info: info for registering and unregistering uio device
*/
struct xilinx_xlnk_eng_device {
struct xlnk_eng_device common;
void __iomem *base;
spinlock_t lock;
int cnt;
struct uio_info *info;
};
static void xlnk_eng_release(struct device *dev)
{
struct xilinx_xlnk_eng_device *xdev;
struct xlnk_eng_device *xlnk_dev;
xdev = dev_get_drvdata(dev);
xlnk_dev = &xdev->common;
if (!xlnk_dev)
return;
xlnk_dev->free(xlnk_dev);
}
#define DRIVER_NAME "xilinx-xlnk-eng"
#define to_xilinx_xlnk(dev) container_of(dev, \
struct xilinx_xlnk_eng_device, common)
static struct xlnk_eng_device *xilinx_xlnk_alloc(
struct xlnk_eng_device *xlnkdev)
{
struct xilinx_xlnk_eng_device *xdev;
struct xlnk_eng_device *retdev;
xdev = to_xilinx_xlnk(xlnkdev);
if (xdev->cnt == 0) {
xdev->cnt++;
retdev = xlnkdev;
} else
retdev = NULL;
return retdev;
}
static void xilinx_xlnk_free(struct xlnk_eng_device *xlnkdev)
{
struct xilinx_xlnk_eng_device *xdev;
xdev = to_xilinx_xlnk(xlnkdev);
xdev->cnt = 0;
}
static int xlnk_eng_probe(struct platform_device *pdev)
{
struct resource *res;
struct xilinx_xlnk_eng_device *xdev;
struct uio_info *info;
char *devname;
pr_info("xlnk_eng_probe ...\n");
xdev = devm_kzalloc(&pdev->dev, sizeof(*xdev), GFP_KERNEL);
if (!xdev) {
dev_err(&pdev->dev, "Not enough memory for device\n");
return -ENOMEM;
}
/* more error handling */
info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
if (!info) {
dev_err(&pdev->dev, "Not enough memory for device\n");
return -ENOMEM;
}
xdev->info = info;
devname = devm_kzalloc(&pdev->dev, 64, GFP_KERNEL);
if (!devname) {
dev_err(&pdev->dev, "Not enough memory for device\n");
return -ENOMEM;
}
sprintf(devname, "%s.%d", DRIVER_NAME, pdev->id);
pr_info("uio name %s\n", devname);
/* iomap registers */
/* Get the data from the platform device */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
xdev->base = devm_ioremap_resource(&pdev->dev, res);
/* %pa types should be used here */
dev_info(&pdev->dev, "physical base : 0x%lx\n",
(unsigned long)res->start);
dev_info(&pdev->dev, "register range : 0x%lx\n",
(unsigned long)resource_size(res));
dev_info(&pdev->dev, "base remapped to: 0x%lx\n",
(unsigned long)xdev->base);
if (!xdev->base) {
dev_err(&pdev->dev, "unable to iomap registers\n");
return -ENOMEM;
}
info->mem[0].addr = res->start;
info->mem[0].size = resource_size(res);
info->mem[0].memtype = UIO_MEM_PHYS;
info->mem[0].internal_addr = xdev->base;
/* info->name = DRIVER_NAME; */
info->name = devname;
info->version = "0.0.1";
info->irq = -1;
xdev->common.dev = &pdev->dev;
xdev->common.alloc = xilinx_xlnk_alloc;
xdev->common.free = xilinx_xlnk_free;
xdev->common.dev->release = xlnk_eng_release;
dev_set_drvdata(&pdev->dev, xdev);
spin_lock_init(&xdev->lock);
xdev->cnt = 0;
xlnk_eng_register_device(&xdev->common);
if (uio_register_device(&pdev->dev, info)) {
dev_err(&pdev->dev, "uio_register_device failed\n");
return -ENODEV;
}
dev_info(&pdev->dev, "xilinx-xlnk-eng uio registered\n");
return 0;
}
static int xlnk_eng_remove(struct platform_device *pdev)
{
struct uio_info *info;
struct xilinx_xlnk_eng_device *xdev;
xdev = dev_get_drvdata(&pdev->dev);
info = xdev->info;
uio_unregister_device(info);
dev_info(&pdev->dev, "xilinx-xlnk-eng uio unregistered\n");
xlnk_eng_unregister_device(&xdev->common);
return 0;
}
static struct platform_driver xlnk_eng_driver = {
.probe = xlnk_eng_probe,
.remove = xlnk_eng_remove,
.driver = {
.owner = THIS_MODULE,
.name = DRIVER_NAME,
},
};
module_platform_driver(xlnk_eng_driver);
MODULE_DESCRIPTION("Xilinx xlnk engine generic driver");
MODULE_LICENSE("GPL");
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