char: remove tile-srom.c

The tile architecture is being removed, so we no longer need this driver.
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>

drivers/char/Kconfig

@@ -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

@@ -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

-/*
- * 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);