Commit b6aba85c authored by Rebecca Schultz's avatar Rebecca Schultz Committed by Greg Kroah-Hartman
Browse files

staging: android: add pmem driver 



This adds the Android pmem driver to the staging tree.

[At this point in time, it is dependent on the ARM platform, due to some
build issues that require it. - gregkh]

Signed-off-by: default avatarRebecca Schultz <rschultz@google.com>
Signed-off-by: default avatarRebecca Schultz Zavin <rebecca@android.com>
Signed-off-by: default avatarDima Zavin <dima@android.com>
Signed-off-by: default avatarJamie Gennis <jgennis@google.com>
Cc: Brian Swetland <swetland@google.com>
Cc: Arve Hjønnevåg <arve@android.com>
Cc: Colin Cross <ccross@android.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent c001dff0

drivers/staging/android/Kconfig

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@@ -90,6 +90,10 @@ config ANDROID_LOW_MEMORY_KILLER 
	---help---

	  Register processes to be killed when memory is low



config ANDROID_PMEM

	bool "Android pmem allocator"

	depends on ARM



source "drivers/staging/android/switch/Kconfig"



endif # if ANDROID

drivers/staging/android/Makefile

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@@ -4,4 +4,5 @@ obj-$(CONFIG_ANDROID_RAM_CONSOLE) += ram_console.o 
obj-$(CONFIG_ANDROID_TIMED_OUTPUT)	+= timed_output.o

obj-$(CONFIG_ANDROID_TIMED_GPIO)	+= timed_gpio.o

obj-$(CONFIG_ANDROID_LOW_MEMORY_KILLER)	+= lowmemorykiller.o

obj-$(CONFIG_ANDROID_PMEM)		+= pmem.o

obj-$(CONFIG_ANDROID_SWITCH)		+= switch/

drivers/staging/android/android_pmem.h

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/* include/linux/android_pmem.h

 *

 * Copyright (C) 2007 Google, Inc.

 *

 * This software is licensed under the terms of the GNU General Public

 * License version 2, as published by the Free Software Foundation, and

 * may be copied, distributed, and modified under those terms.

 *

 * 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.  See the

 * GNU General Public License for more details.

 *

 */



#ifndef _ANDROID_PMEM_H_

#define _ANDROID_PMEM_H_



#define PMEM_IOCTL_MAGIC 'p'

#define PMEM_GET_PHYS		_IOW(PMEM_IOCTL_MAGIC, 1, unsigned int)

#define PMEM_MAP		_IOW(PMEM_IOCTL_MAGIC, 2, unsigned int)

#define PMEM_GET_SIZE		_IOW(PMEM_IOCTL_MAGIC, 3, unsigned int)

#define PMEM_UNMAP		_IOW(PMEM_IOCTL_MAGIC, 4, unsigned int)

/* This ioctl will allocate pmem space, backing the file, it will fail

 * if the file already has an allocation, pass it the len as the argument

 * to the ioctl */

#define PMEM_ALLOCATE		_IOW(PMEM_IOCTL_MAGIC, 5, unsigned int)

/* This will connect a one pmem file to another, pass the file that is already

 * backed in memory as the argument to the ioctl

 */

#define PMEM_CONNECT		_IOW(PMEM_IOCTL_MAGIC, 6, unsigned int)

/* Returns the total size of the pmem region it is sent to as a pmem_region

 * struct (with offset set to 0). 

 */

#define PMEM_GET_TOTAL_SIZE	_IOW(PMEM_IOCTL_MAGIC, 7, unsigned int)

#define PMEM_CACHE_FLUSH	_IOW(PMEM_IOCTL_MAGIC, 8, unsigned int)



struct android_pmem_platform_data

{

	const char* name;

	/* starting physical address of memory region */

	unsigned long start;

	/* size of memory region */

	unsigned long size;

	/* set to indicate the region should not be managed with an allocator */

	unsigned no_allocator;

	/* set to indicate maps of this region should be cached, if a mix of

	 * cached and uncached is desired, set this and open the device with

	 * O_SYNC to get an uncached region */

	unsigned cached;

	/* The MSM7k has bits to enable a write buffer in the bus controller*/

	unsigned buffered;

};



struct pmem_region {

	unsigned long offset;

	unsigned long len;

};



#ifdef CONFIG_ANDROID_PMEM

int is_pmem_file(struct file *file);

int get_pmem_file(int fd, unsigned long *start, unsigned long *vstart,

		  unsigned long *end, struct file **filp);

int get_pmem_user_addr(struct file *file, unsigned long *start,

		       unsigned long *end);

void put_pmem_file(struct file* file);

void flush_pmem_file(struct file *file, unsigned long start, unsigned long len);

int pmem_setup(struct android_pmem_platform_data *pdata,

	       long (*ioctl)(struct file *, unsigned int, unsigned long),

	       int (*release)(struct inode *, struct file *));

int pmem_remap(struct pmem_region *region, struct file *file,

	       unsigned operation);



#else

static inline int is_pmem_file(struct file *file) { return 0; }

static inline int get_pmem_file(int fd, unsigned long *start,

				unsigned long *vstart, unsigned long *end,

				struct file **filp) { return -ENOSYS; }

static inline int get_pmem_user_addr(struct file *file, unsigned long *start,

				     unsigned long *end) { return -ENOSYS; }

static inline void put_pmem_file(struct file* file) { return; }

static inline void flush_pmem_file(struct file *file, unsigned long start,

				   unsigned long len) { return; }

static inline int pmem_setup(struct android_pmem_platform_data *pdata,

	      long (*ioctl)(struct file *, unsigned int, unsigned long),

	      int (*release)(struct inode *, struct file *)) { return -ENOSYS; }



static inline int pmem_remap(struct pmem_region *region, struct file *file,

			     unsigned operation) { return -ENOSYS; }

#endif



#endif //_ANDROID_PPP_H_

drivers/staging/android/pmem.c

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File added.

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