Commit 315e80e7 authored by Arnd Bergmann's avatar Arnd Bergmann
Browse files

char: remove tile-srom.c 



The tile architecture is being removed, so we no longer need this driver.

Acked-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
parent 59fc07b3

drivers/char/Kconfig

+0 −11
Original line number Diff line number Diff line
@@ -566,17 +566,6 @@ config DEVPORT 


source "drivers/s390/char/Kconfig"



config TILE_SROM

	tristate "Character-device access via hypervisor to the Tilera SPI ROM"

	depends on TILE

	default y

	---help---

	  This device provides character-level read-write access

	  to the SROM, typically via the "0", "1", and "2" devices

	  in /dev/srom/.  The Tilera hypervisor makes the flash

	  device appear much like a simple EEPROM, and knows

	  how to partition a single ROM for multiple purposes.



source "drivers/char/xillybus/Kconfig"



endmenu

drivers/char/Makefile

+0 −1
Original line number Diff line number Diff line
@@ -56,6 +56,5 @@ obj-$(CONFIG_PS3_FLASH) += ps3flash.o 
obj-$(CONFIG_JS_RTC)		+= js-rtc.o

js-rtc-y = rtc.o



obj-$(CONFIG_TILE_SROM)		+= tile-srom.o

obj-$(CONFIG_XILLYBUS)		+= xillybus/

obj-$(CONFIG_POWERNV_OP_PANEL)	+= powernv-op-panel.o

drivers/char/tile-srom.c

deleted100644 → 0
+0 −475
Original line number Diff line number Diff line 
/*

 * Copyright 2011 Tilera Corporation. All Rights Reserved.

 *

 *   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, version 2.

 *

 *   This program is distributed in the hope that it will be useful, but

 *   WITHOUT ANY WARRANTY; without even the implied warranty of

 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or

 *   NON INFRINGEMENT.  See the GNU General Public License for

 *   more details.

 *

 * SPI Flash ROM driver

 *

 * This source code is derived from code provided in "Linux Device

 * Drivers, Third Edition", by Jonathan Corbet, Alessandro Rubini, and

 * Greg Kroah-Hartman, published by O'Reilly Media, Inc.

 */



#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/kernel.h>	/* printk() */

#include <linux/slab.h>		/* kmalloc() */

#include <linux/fs.h>		/* everything... */

#include <linux/errno.h>	/* error codes */

#include <linux/types.h>	/* size_t */

#include <linux/proc_fs.h>

#include <linux/fcntl.h>	/* O_ACCMODE */

#include <linux/pagemap.h>

#include <linux/hugetlb.h>

#include <linux/uaccess.h>

#include <linux/platform_device.h>

#include <hv/hypervisor.h>

#include <linux/ioctl.h>

#include <linux/cdev.h>

#include <linux/delay.h>

#include <hv/drv_srom_intf.h>



/*

 * Size of our hypervisor I/O requests.  We break up large transfers

 * so that we don't spend large uninterrupted spans of time in the

 * hypervisor.  Erasing an SROM sector takes a significant fraction of

 * a second, so if we allowed the user to, say, do one I/O to write the

 * entire ROM, we'd get soft lockup timeouts, or worse.

 */

#define SROM_CHUNK_SIZE ((size_t)4096)



/*

 * When hypervisor is busy (e.g. erasing), poll the status periodically.

 */



/*

 * Interval to poll the state in msec

 */

#define SROM_WAIT_TRY_INTERVAL 20



/*

 * Maximum times to poll the state

 */

#define SROM_MAX_WAIT_TRY_TIMES 1000



struct srom_dev {

	int hv_devhdl;			/* Handle for hypervisor device */

	u32 total_size;			/* Size of this device */

	u32 sector_size;		/* Size of a sector */

	u32 page_size;			/* Size of a page */

	struct mutex lock;		/* Allow only one accessor at a time */

};



static int srom_major;			/* Dynamic major by default */

module_param(srom_major, int, 0);

MODULE_AUTHOR("Tilera Corporation");

MODULE_LICENSE("GPL");



static int srom_devs;			/* Number of SROM partitions */

static struct cdev srom_cdev;

static struct platform_device *srom_parent;

static struct class *srom_class;

static struct srom_dev *srom_devices;



/*

 * Handle calling the hypervisor and managing EAGAIN/EBUSY.

 */



static ssize_t _srom_read(int hv_devhdl, void *buf,

			  loff_t off, size_t count)

{

	int retval, retries = SROM_MAX_WAIT_TRY_TIMES;

	for (;;) {

		retval = hv_dev_pread(hv_devhdl, 0, (HV_VirtAddr)buf,

				      count, off);

		if (retval >= 0)

			return retval;

		if (retval == HV_EAGAIN)

			continue;

		if (retval == HV_EBUSY && --retries > 0) {

			msleep(SROM_WAIT_TRY_INTERVAL);

			continue;

		}

		pr_err("_srom_read: error %d\n", retval);

		return -EIO;

	}

}



static ssize_t _srom_write(int hv_devhdl, const void *buf,

			   loff_t off, size_t count)

{

	int retval, retries = SROM_MAX_WAIT_TRY_TIMES;

	for (;;) {

		retval = hv_dev_pwrite(hv_devhdl, 0, (HV_VirtAddr)buf,

				       count, off);

		if (retval >= 0)

			return retval;

		if (retval == HV_EAGAIN)

			continue;

		if (retval == HV_EBUSY && --retries > 0) {

			msleep(SROM_WAIT_TRY_INTERVAL);

			continue;

		}

		pr_err("_srom_write: error %d\n", retval);

		return -EIO;

	}

}



/**

 * srom_open() - Device open routine.

 * @inode: Inode for this device.

 * @filp: File for this specific open of the device.

 *

 * Returns zero, or an error code.

 */

static int srom_open(struct inode *inode, struct file *filp)

{

	filp->private_data = &srom_devices[iminor(inode)];

	return 0;

}





/**

 * srom_release() - Device release routine.

 * @inode: Inode for this device.

 * @filp: File for this specific open of the device.

 *

 * Returns zero, or an error code.

 */

static int srom_release(struct inode *inode, struct file *filp)

{

	struct srom_dev *srom = filp->private_data;

	char dummy;



	/* Make sure we've flushed anything written to the ROM. */

	mutex_lock(&srom->lock);

	if (srom->hv_devhdl >= 0)

		_srom_write(srom->hv_devhdl, &dummy, SROM_FLUSH_OFF, 1);

	mutex_unlock(&srom->lock);



	filp->private_data = NULL;



	return 0;

}





/**

 * srom_read() - Read data from the device.

 * @filp: File for this specific open of the device.

 * @buf: User's data buffer.

 * @count: Number of bytes requested.

 * @f_pos: File position.

 *

 * Returns number of bytes read, or an error code.

 */

static ssize_t srom_read(struct file *filp, char __user *buf,

			 size_t count, loff_t *f_pos)

{

	int retval = 0;

	void *kernbuf;

	struct srom_dev *srom = filp->private_data;



	kernbuf = kmalloc(SROM_CHUNK_SIZE, GFP_KERNEL);

	if (!kernbuf)

		return -ENOMEM;



	if (mutex_lock_interruptible(&srom->lock)) {

		retval = -ERESTARTSYS;

		kfree(kernbuf);

		return retval;

	}



	while (count) {

		int hv_retval;

		int bytes_this_pass = min(count, SROM_CHUNK_SIZE);



		hv_retval = _srom_read(srom->hv_devhdl, kernbuf,

				       *f_pos, bytes_this_pass);

		if (hv_retval <= 0) {

			if (retval == 0)

				retval = hv_retval;

			break;

		}



		if (copy_to_user(buf, kernbuf, hv_retval) != 0) {

			retval = -EFAULT;

			break;

		}



		retval += hv_retval;

		*f_pos += hv_retval;

		buf += hv_retval;

		count -= hv_retval;

	}



	mutex_unlock(&srom->lock);

	kfree(kernbuf);



	return retval;

}



/**

 * srom_write() - Write data to the device.

 * @filp: File for this specific open of the device.

 * @buf: User's data buffer.

 * @count: Number of bytes requested.

 * @f_pos: File position.

 *

 * Returns number of bytes written, or an error code.

 */

static ssize_t srom_write(struct file *filp, const char __user *buf,

			  size_t count, loff_t *f_pos)

{

	int retval = 0;

	void *kernbuf;

	struct srom_dev *srom = filp->private_data;



	kernbuf = kmalloc(SROM_CHUNK_SIZE, GFP_KERNEL);

	if (!kernbuf)

		return -ENOMEM;



	if (mutex_lock_interruptible(&srom->lock)) {

		retval = -ERESTARTSYS;

		kfree(kernbuf);

		return retval;

	}



	while (count) {

		int hv_retval;

		int bytes_this_pass = min(count, SROM_CHUNK_SIZE);



		if (copy_from_user(kernbuf, buf, bytes_this_pass) != 0) {

			retval = -EFAULT;

			break;

		}



		hv_retval = _srom_write(srom->hv_devhdl, kernbuf,

					*f_pos, bytes_this_pass);

		if (hv_retval <= 0) {

			if (retval == 0)

				retval = hv_retval;

			break;

		}



		retval += hv_retval;

		*f_pos += hv_retval;

		buf += hv_retval;

		count -= hv_retval;

	}



	mutex_unlock(&srom->lock);

	kfree(kernbuf);



	return retval;

}



/* Provide our own implementation so we can use srom->total_size. */

loff_t srom_llseek(struct file *file, loff_t offset, int origin)

{

	struct srom_dev *srom = file->private_data;

	return fixed_size_llseek(file, offset, origin, srom->total_size);

}



static ssize_t total_size_show(struct device *dev,

			       struct device_attribute *attr, char *buf)

{

	struct srom_dev *srom = dev_get_drvdata(dev);

	return sprintf(buf, "%u\n", srom->total_size);

}

static DEVICE_ATTR_RO(total_size);



static ssize_t sector_size_show(struct device *dev,

				struct device_attribute *attr, char *buf)

{

	struct srom_dev *srom = dev_get_drvdata(dev);

	return sprintf(buf, "%u\n", srom->sector_size);

}

static DEVICE_ATTR_RO(sector_size);



static ssize_t page_size_show(struct device *dev,

			      struct device_attribute *attr, char *buf)

{

	struct srom_dev *srom = dev_get_drvdata(dev);

	return sprintf(buf, "%u\n", srom->page_size);

}

static DEVICE_ATTR_RO(page_size);



static struct attribute *srom_dev_attrs[] = {

	&dev_attr_total_size.attr,

	&dev_attr_sector_size.attr,

	&dev_attr_page_size.attr,

	NULL,

};

ATTRIBUTE_GROUPS(srom_dev);



static char *srom_devnode(struct device *dev, umode_t *mode)

{

	if (mode)

		*mode = 0644;

	return kasprintf(GFP_KERNEL, "srom/%s", dev_name(dev));

}



/*

 * The fops

 */

static const struct file_operations srom_fops = {

	.owner =     THIS_MODULE,

	.llseek =    srom_llseek,

	.read =	     srom_read,

	.write =     srom_write,

	.open =	     srom_open,

	.release =   srom_release,

};



/**

 * srom_setup_minor() - Initialize per-minor information.

 * @srom: Per-device SROM state.

 * @devhdl: Partition device handle.

 */

static int srom_setup_minor(struct srom_dev *srom, int devhdl)

{

	srom->hv_devhdl = devhdl;

	mutex_init(&srom->lock);



	if (_srom_read(devhdl, &srom->total_size,

		       SROM_TOTAL_SIZE_OFF, sizeof(srom->total_size)) < 0)

		return -EIO;

	if (_srom_read(devhdl, &srom->sector_size,

		       SROM_SECTOR_SIZE_OFF, sizeof(srom->sector_size)) < 0)

		return -EIO;

	if (_srom_read(devhdl, &srom->page_size,

		       SROM_PAGE_SIZE_OFF, sizeof(srom->page_size)) < 0)

		return -EIO;



	return 0;

}



/** srom_init() - Initialize the driver's module. */

static int srom_init(void)

{

	int result, i;

	dev_t dev = MKDEV(srom_major, 0);



	/*

	 * Start with a plausible number of partitions; the krealloc() call

	 * below will yield about log(srom_devs) additional allocations.

	 */

	srom_devices = kmalloc(4 * sizeof(struct srom_dev), GFP_KERNEL);



	/* Discover the number of srom partitions. */

	for (i = 0; ; i++) {

		int devhdl;

		char buf[20];

		struct srom_dev *new_srom_devices =

			krealloc(srom_devices, (i+1) * sizeof(struct srom_dev),

				 GFP_KERNEL);

		if (!new_srom_devices) {

			result = -ENOMEM;

			goto fail_mem;

		}

		srom_devices = new_srom_devices;

		sprintf(buf, "srom/0/%d", i);

		devhdl = hv_dev_open((HV_VirtAddr)buf, 0);

		if (devhdl < 0) {

			if (devhdl != HV_ENODEV)

				pr_notice("srom/%d: hv_dev_open failed: %d.\n",

					  i, devhdl);

			break;

		}

		result = srom_setup_minor(&srom_devices[i], devhdl);

		if (result != 0)

			goto fail_mem;

	}

	srom_devs = i;



	/* Bail out early if we have no partitions at all. */

	if (srom_devs == 0) {

		result = -ENODEV;

		goto fail_mem;

	}



	/* Register our major, and accept a dynamic number. */

	if (srom_major)

		result = register_chrdev_region(dev, srom_devs, "srom");

	else {

		result = alloc_chrdev_region(&dev, 0, srom_devs, "srom");

		srom_major = MAJOR(dev);

	}

	if (result < 0)

		goto fail_mem;



	/* Register a character device. */

	cdev_init(&srom_cdev, &srom_fops);

	srom_cdev.owner = THIS_MODULE;

	srom_cdev.ops = &srom_fops;

	result = cdev_add(&srom_cdev, dev, srom_devs);

	if (result < 0)

		goto fail_chrdev;



	/* Create a parent device */

	srom_parent = platform_device_register_simple("srom", -1, NULL, 0);

	if (IS_ERR(srom_parent)) {

		result = PTR_ERR(srom_parent);

		goto fail_pdev;

	}



	/* Create a sysfs class. */

	srom_class = class_create(THIS_MODULE, "srom");

	if (IS_ERR(srom_class)) {

		result = PTR_ERR(srom_class);

		goto fail_cdev;

	}

	srom_class->dev_groups = srom_dev_groups;

	srom_class->devnode = srom_devnode;



	/* Create per-partition devices */

	for (i = 0; i < srom_devs; i++) {

		struct device *dev =

			device_create(srom_class, &srom_parent->dev,

				      MKDEV(srom_major, i), srom_devices + i,

				      "%d", i);

		result = PTR_ERR_OR_ZERO(dev);

		if (result < 0)

			goto fail_class;

	}



	return 0;



fail_class:

	for (i = 0; i < srom_devs; i++)

		device_destroy(srom_class, MKDEV(srom_major, i));

	class_destroy(srom_class);

fail_cdev:

	platform_device_unregister(srom_parent);

fail_pdev:

	cdev_del(&srom_cdev);

fail_chrdev:

	unregister_chrdev_region(dev, srom_devs);

fail_mem:

	kfree(srom_devices);

	return result;

}



/** srom_cleanup() - Clean up the driver's module. */

static void srom_cleanup(void)

{

	int i;

	for (i = 0; i < srom_devs; i++)

		device_destroy(srom_class, MKDEV(srom_major, i));

	class_destroy(srom_class);

	cdev_del(&srom_cdev);

	platform_device_unregister(srom_parent);

	unregister_chrdev_region(MKDEV(srom_major, 0), srom_devs);

	kfree(srom_devices);

}



module_init(srom_init);

module_exit(srom_cleanup);