arch/blackfin/mm/blackfin_sram.c - linux - Git at Google

 /*
  * File:         arch/blackfin/mm/blackfin_sram.c
  * Based on:
  * Author:
  *
  * Created:
  * Description:  SRAM driver for Blackfin ADSP-BF5xx
  *
  * Modified:
  *               Copyright 2004-2007 Analog Devices Inc.
  *
  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  *
  * 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.
  *
  * 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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, see the file COPYING, or write
  * to the Free Software Foundation, Inc.,
  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/miscdevice.h>
 #include <linux/ioport.h>
 #include <linux/fcntl.h>
 #include <linux/init.h>
 #include <linux/poll.h>
 #include <linux/proc_fs.h>
 #include <linux/spinlock.h>
 #include <linux/rtc.h>
 #include <asm/blackfin.h>
 #include "blackfin_sram.h"

 spinlock_t l1sram_lock, l1_data_sram_lock, l1_inst_sram_lock;

 #if CONFIG_L1_MAX_PIECE < 16
 #undef CONFIG_L1_MAX_PIECE
 #define CONFIG_L1_MAX_PIECE        16
 #endif

 #if CONFIG_L1_MAX_PIECE > 1024
 #undef CONFIG_L1_MAX_PIECE
 #define CONFIG_L1_MAX_PIECE        1024
 #endif

 #define SRAM_SLT_NULL      0
 #define SRAM_SLT_FREE      1
 #define SRAM_SLT_ALLOCATED 2

 /* the data structure for L1 scratchpad and DATA SRAM */
 struct l1_sram_piece {
 	void *paddr;
 	int size;
 	int flag;
 	pid_t pid;
 };

 static struct l1_sram_piece l1_ssram[CONFIG_L1_MAX_PIECE];

 #if L1_DATA_A_LENGTH != 0
 static struct l1_sram_piece l1_data_A_sram[CONFIG_L1_MAX_PIECE];
 #endif

 #if L1_DATA_B_LENGTH != 0
 static struct l1_sram_piece l1_data_B_sram[CONFIG_L1_MAX_PIECE];
 #endif

 #if L1_CODE_LENGTH != 0
 static struct l1_sram_piece l1_inst_sram[CONFIG_L1_MAX_PIECE];
 #endif

 /* L1 Scratchpad SRAM initialization function */
 void __init l1sram_init(void)
 {
 	printk(KERN_INFO "Blackfin Scratchpad data SRAM: %d KB\n",
 	       L1_SCRATCH_LENGTH >> 10);

 	memset(&l1_ssram, 0x00, sizeof(l1_ssram));
 	l1_ssram[0].paddr = (void *)L1_SCRATCH_START;
 	l1_ssram[0].size = L1_SCRATCH_LENGTH;
 	l1_ssram[0].flag = SRAM_SLT_FREE;

 	/* mutex initialize */
 	spin_lock_init(&l1sram_lock);
 }

 void __init l1_data_sram_init(void)
 {
 #if L1_DATA_A_LENGTH != 0
 	memset(&l1_data_A_sram, 0x00, sizeof(l1_data_A_sram));
 	l1_data_A_sram[0].paddr = (void *)L1_DATA_A_START +
 					(_ebss_l1 - _sdata_l1);
 	l1_data_A_sram[0].size = L1_DATA_A_LENGTH - (_ebss_l1 - _sdata_l1);
 	l1_data_A_sram[0].flag = SRAM_SLT_FREE;

 	printk(KERN_INFO "Blackfin Data A SRAM: %d KB (%d KB free)\n",
 	       L1_DATA_A_LENGTH >> 10, l1_data_A_sram[0].size >> 10);
 #endif
 #if L1_DATA_B_LENGTH != 0
 	memset(&l1_data_B_sram, 0x00, sizeof(l1_data_B_sram));
 	l1_data_B_sram[0].paddr = (void *)L1_DATA_B_START +
 				(_ebss_b_l1 - _sdata_b_l1);
 	l1_data_B_sram[0].size = L1_DATA_B_LENGTH - (_ebss_b_l1 - _sdata_b_l1);
 	l1_data_B_sram[0].flag = SRAM_SLT_FREE;

 	printk(KERN_INFO "Blackfin Data B SRAM: %d KB (%d KB free)\n",
 	       L1_DATA_B_LENGTH >> 10, l1_data_B_sram[0].size >> 10);
 #endif

 	/* mutex initialize */
 	spin_lock_init(&l1_data_sram_lock);
 }

 void __init l1_inst_sram_init(void)
 {
 #if L1_CODE_LENGTH != 0
 	memset(&l1_inst_sram, 0x00, sizeof(l1_inst_sram));
 	l1_inst_sram[0].paddr = (void *)L1_CODE_START + (_etext_l1 - _stext_l1);
 	l1_inst_sram[0].size = L1_CODE_LENGTH - (_etext_l1 - _stext_l1);
 	l1_inst_sram[0].flag = SRAM_SLT_FREE;

 	printk(KERN_INFO "Blackfin Instruction SRAM: %d KB (%d KB free)\n",
 	       L1_CODE_LENGTH >> 10, l1_inst_sram[0].size >> 10);
 #endif

 	/* mutex initialize */
 	spin_lock_init(&l1_inst_sram_lock);
 }

 /* L1 memory allocate function */
 static void *_l1_sram_alloc(size_t size, struct l1_sram_piece *pfree, int count)
 {
 	int i, index = 0;
 	void *addr = NULL;

 	if (size <= 0)
 		return NULL;

 	/* Align the size */
 	size = (size + 3) & ~3;

 	/* not use the good method to match the best slot !!! */
 	/* search an available memory slot */
 	for (i = 0; i < count; i++) {
 		if ((pfree[i].flag == SRAM_SLT_FREE)
 		    && (pfree[i].size >= size)) {
 			addr = pfree[i].paddr;
 			pfree[i].flag = SRAM_SLT_ALLOCATED;
 			pfree[i].pid = current->pid;
 			index = i;
 			break;
 		}
 	}
 	if (i >= count)
 		return NULL;

 	/* updated the NULL memory slot !!! */
 	if (pfree[i].size > size) {
 		for (i = 0; i < count; i++) {
 			if (pfree[i].flag == SRAM_SLT_NULL) {
 				pfree[i].pid = 0;
 				pfree[i].flag = SRAM_SLT_FREE;
 				pfree[i].paddr = addr + size;
 				pfree[i].size = pfree[index].size - size;
 				pfree[index].size = size;
 				break;
 			}
 		}
 	}

 	return addr;
 }

 /* Allocate the largest available block.  */
 static void *_l1_sram_alloc_max(struct l1_sram_piece *pfree, int count,
 				unsigned long *psize)
 {
 	unsigned long best = 0;
 	int i, index = -1;
 	void *addr = NULL;

 	/* search an available memory slot */
 	for (i = 0; i < count; i++) {
 		if (pfree[i].flag == SRAM_SLT_FREE && pfree[i].size > best) {
 			addr = pfree[i].paddr;
 			index = i;
 			best = pfree[i].size;
 		}
 	}
 	if (index < 0)
 		return NULL;
 	*psize = best;

 	pfree[index].pid = current->pid;
 	pfree[index].flag = SRAM_SLT_ALLOCATED;
 	return addr;
 }

 /* L1 memory free function */
 static int _l1_sram_free(const void *addr,
 			struct l1_sram_piece *pfree,
 			int count)
 {
 	int i, index = 0;

 	/* search the relevant memory slot */
 	for (i = 0; i < count; i++) {
 		if (pfree[i].paddr == addr) {
 			if (pfree[i].flag != SRAM_SLT_ALLOCATED) {
 				/* error log */
 				return -1;
 			}
 			index = i;
 			break;
 		}
 	}
 	if (i >= count)
 		return -1;

 	pfree[index].pid = 0;
 	pfree[index].flag = SRAM_SLT_FREE;

 	/* link the next address slot */
 	for (i = 0; i < count; i++) {
 		if (((pfree[index].paddr + pfree[index].size) == pfree[i].paddr)
 		    && (pfree[i].flag == SRAM_SLT_FREE)) {
 			pfree[i].pid = 0;
 			pfree[i].flag = SRAM_SLT_NULL;
 			pfree[index].size += pfree[i].size;
 			pfree[index].flag = SRAM_SLT_FREE;
 			break;
 		}
 	}

 	/* link the last address slot */
 	for (i = 0; i < count; i++) {
 		if (((pfree[i].paddr + pfree[i].size) == pfree[index].paddr) &&
 		    (pfree[i].flag == SRAM_SLT_FREE)) {
 			pfree[index].flag = SRAM_SLT_NULL;
 			pfree[i].size += pfree[index].size;
 			break;
 		}
 	}

 	return 0;
 }

 int sram_free(const void *addr)
 {
 	if (0) {}
 #if L1_CODE_LENGTH != 0
 	else if (addr >= (void *)L1_CODE_START
 		 && addr < (void *)(L1_CODE_START + L1_CODE_LENGTH))
 		return l1_inst_sram_free(addr);
 #endif
 #if L1_DATA_A_LENGTH != 0
 	else if (addr >= (void *)L1_DATA_A_START
 		 && addr < (void *)(L1_DATA_A_START + L1_DATA_A_LENGTH))
 		return l1_data_A_sram_free(addr);
 #endif
 #if L1_DATA_B_LENGTH != 0
 	else if (addr >= (void *)L1_DATA_B_START
 		 && addr < (void *)(L1_DATA_B_START + L1_DATA_B_LENGTH))
 		return l1_data_B_sram_free(addr);
 #endif
 	else
 		return -1;
 }
 EXPORT_SYMBOL(sram_free);

 void *l1_data_A_sram_alloc(size_t size)
 {
 	unsigned flags;
 	void *addr = NULL;

 	/* add mutex operation */
 	spin_lock_irqsave(&l1_data_sram_lock, flags);

 #if L1_DATA_A_LENGTH != 0
 	addr = _l1_sram_alloc(size, l1_data_A_sram, ARRAY_SIZE(l1_data_A_sram));
 #endif

 	/* add mutex operation */
 	spin_unlock_irqrestore(&l1_data_sram_lock, flags);

 	pr_debug("Allocated address in l1_data_A_sram_alloc is 0x%lx+0x%lx\n",
 		 (long unsigned int)addr, size);

 	return addr;
 }
 EXPORT_SYMBOL(l1_data_A_sram_alloc);

 int l1_data_A_sram_free(const void *addr)
 {
 	unsigned flags;
 	int ret;

 	/* add mutex operation */
 	spin_lock_irqsave(&l1_data_sram_lock, flags);

 #if L1_DATA_A_LENGTH != 0
 	ret = _l1_sram_free(addr,
 			   l1_data_A_sram, ARRAY_SIZE(l1_data_A_sram));
 #else
 	ret = -1;
 #endif

 	/* add mutex operation */
 	spin_unlock_irqrestore(&l1_data_sram_lock, flags);

 	return ret;
 }
 EXPORT_SYMBOL(l1_data_A_sram_free);

 void *l1_data_B_sram_alloc(size_t size)
 {
 #if L1_DATA_B_LENGTH != 0
 	unsigned flags;
 	void *addr;

 	/* add mutex operation */
 	spin_lock_irqsave(&l1_data_sram_lock, flags);

 	addr = _l1_sram_alloc(size, l1_data_B_sram, ARRAY_SIZE(l1_data_B_sram));

 	/* add mutex operation */
 	spin_unlock_irqrestore(&l1_data_sram_lock, flags);

 	pr_debug("Allocated address in l1_data_B_sram_alloc is 0x%lx+0x%lx\n",
 		 (long unsigned int)addr, size);

 	return addr;
 #else
 	return NULL;
 #endif
 }
 EXPORT_SYMBOL(l1_data_B_sram_alloc);

 int l1_data_B_sram_free(const void *addr)
 {
 #if L1_DATA_B_LENGTH != 0
 	unsigned flags;
 	int ret;

 	/* add mutex operation */
 	spin_lock_irqsave(&l1_data_sram_lock, flags);

 	ret = _l1_sram_free(addr, l1_data_B_sram, ARRAY_SIZE(l1_data_B_sram));

 	/* add mutex operation */
 	spin_unlock_irqrestore(&l1_data_sram_lock, flags);

 	return ret;
 #else
 	return -1;
 #endif
 }
 EXPORT_SYMBOL(l1_data_B_sram_free);

 void *l1_data_sram_alloc(size_t size)
 {
 	void *addr = l1_data_A_sram_alloc(size);

 	if (!addr)
 		addr = l1_data_B_sram_alloc(size);

 	return addr;
 }
 EXPORT_SYMBOL(l1_data_sram_alloc);

 void *l1_data_sram_zalloc(size_t size)
 {
 	void *addr = l1_data_sram_alloc(size);

 	if (addr)
 		memset(addr, 0x00, size);

 	return addr;
 }
 EXPORT_SYMBOL(l1_data_sram_zalloc);

 int l1_data_sram_free(const void *addr)
 {
 	int ret;
 	ret = l1_data_A_sram_free(addr);
 	if (ret == -1)
 		ret = l1_data_B_sram_free(addr);
 	return ret;
 }
 EXPORT_SYMBOL(l1_data_sram_free);

 void *l1_inst_sram_alloc(size_t size)
 {
 #if L1_DATA_A_LENGTH != 0
 	unsigned flags;
 	void *addr;

 	/* add mutex operation */
 	spin_lock_irqsave(&l1_inst_sram_lock, flags);

 	addr = _l1_sram_alloc(size, l1_inst_sram, ARRAY_SIZE(l1_inst_sram));

 	/* add mutex operation */
 	spin_unlock_irqrestore(&l1_inst_sram_lock, flags);

 	pr_debug("Allocated address in l1_inst_sram_alloc is 0x%lx+0x%lx\n",
 		 (long unsigned int)addr, size);

 	return addr;
 #else
 	return NULL;
 #endif
 }
 EXPORT_SYMBOL(l1_inst_sram_alloc);

 int l1_inst_sram_free(const void *addr)
 {
 #if L1_CODE_LENGTH != 0
 	unsigned flags;
 	int ret;

 	/* add mutex operation */
 	spin_lock_irqsave(&l1_inst_sram_lock, flags);

 	ret = _l1_sram_free(addr, l1_inst_sram, ARRAY_SIZE(l1_inst_sram));

 	/* add mutex operation */
 	spin_unlock_irqrestore(&l1_inst_sram_lock, flags);

 	return ret;
 #else
 	return -1;
 #endif
 }
 EXPORT_SYMBOL(l1_inst_sram_free);

 /* L1 Scratchpad memory allocate function */
 void *l1sram_alloc(size_t size)
 {
 	unsigned flags;
 	void *addr;

 	/* add mutex operation */
 	spin_lock_irqsave(&l1sram_lock, flags);

 	addr = _l1_sram_alloc(size, l1_ssram, ARRAY_SIZE(l1_ssram));

 	/* add mutex operation */
 	spin_unlock_irqrestore(&l1sram_lock, flags);

 	return addr;
 }

 /* L1 Scratchpad memory allocate function */
 void *l1sram_alloc_max(size_t *psize)
 {
 	unsigned flags;
 	void *addr;

 	/* add mutex operation */
 	spin_lock_irqsave(&l1sram_lock, flags);

 	addr = _l1_sram_alloc_max(l1_ssram, ARRAY_SIZE(l1_ssram), psize);

 	/* add mutex operation */
 	spin_unlock_irqrestore(&l1sram_lock, flags);

 	return addr;
 }

 /* L1 Scratchpad memory free function */
 int l1sram_free(const void *addr)
 {
 	unsigned flags;
 	int ret;

 	/* add mutex operation */
 	spin_lock_irqsave(&l1sram_lock, flags);

 	ret = _l1_sram_free(addr, l1_ssram, ARRAY_SIZE(l1_ssram));

 	/* add mutex operation */
 	spin_unlock_irqrestore(&l1sram_lock, flags);

 	return ret;
 }

 int sram_free_with_lsl(const void *addr)
 {
 	struct sram_list_struct *lsl, **tmp;
 	struct mm_struct *mm = current->mm;

 	for (tmp = &mm->context.sram_list; *tmp; tmp = &(*tmp)->next)
 		if ((*tmp)->addr == addr)
 			goto found;
 	return -1;
 found:
 	lsl = *tmp;
 	sram_free(addr);
 	*tmp = lsl->next;
 	kfree(lsl);

 	return 0;
 }
 EXPORT_SYMBOL(sram_free_with_lsl);

 void *sram_alloc_with_lsl(size_t size, unsigned long flags)
 {
 	void *addr = NULL;
 	struct sram_list_struct *lsl = NULL;
 	struct mm_struct *mm = current->mm;

 	lsl = kzalloc(sizeof(struct sram_list_struct), GFP_KERNEL);
 	if (!lsl)
 		return NULL;

 	if (flags & L1_INST_SRAM)
 		addr = l1_inst_sram_alloc(size);

 	if (addr == NULL && (flags & L1_DATA_A_SRAM))
 		addr = l1_data_A_sram_alloc(size);

 	if (addr == NULL && (flags & L1_DATA_B_SRAM))
 		addr = l1_data_B_sram_alloc(size);

 	if (addr == NULL) {
 		kfree(lsl);
 		return NULL;
 	}
 	lsl->addr = addr;
 	lsl->length = size;
 	lsl->next = mm->context.sram_list;
 	mm->context.sram_list = lsl;
 	return addr;
 }
 EXPORT_SYMBOL(sram_alloc_with_lsl);

 #ifdef CONFIG_PROC_FS
 /* Once we get a real allocator, we'll throw all of this away.
  * Until then, we need some sort of visibility into the L1 alloc.
  */
 static void _l1sram_proc_read(char *buf, int *len, const char *desc,
 		struct l1_sram_piece *pfree, const int array_size)
 {
 	int i;

 	*len += sprintf(&buf[*len], "--- L1 %-14s Size  PID State\n", desc);
 	for (i = 0; i < array_size; ++i) {
 		const char *alloc_type;
 		switch (pfree[i].flag) {
 		case SRAM_SLT_NULL:      alloc_type = "NULL"; break;
 		case SRAM_SLT_FREE:      alloc_type = "FREE"; break;
 		case SRAM_SLT_ALLOCATED: alloc_type = "ALLOCATED"; break;
 		default:                 alloc_type = "????"; break;
 		}
 		*len += sprintf(&buf[*len], "%p-%p %8i %4i %s\n",
 			pfree[i].paddr, pfree[i].paddr + pfree[i].size,
 			pfree[i].size, pfree[i].pid, alloc_type);
 	}
 }
 static int l1sram_proc_read(char *buf, char **start, off_t offset, int count,
 		int *eof, void *data)
 {
 	int len = 0;

 	_l1sram_proc_read(buf, &len, "Scratchpad",
 			l1_ssram, ARRAY_SIZE(l1_ssram));
 #if L1_DATA_A_LENGTH != 0
 	_l1sram_proc_read(buf, &len, "Data A",
 			l1_data_A_sram, ARRAY_SIZE(l1_data_A_sram));
 #endif
 #if L1_DATA_B_LENGTH != 0
 	_l1sram_proc_read(buf, &len, "Data B",
 			l1_data_B_sram, ARRAY_SIZE(l1_data_B_sram));
 #endif
 #if L1_CODE_LENGTH != 0
 	_l1sram_proc_read(buf, &len, "Instruction",
 			l1_inst_sram, ARRAY_SIZE(l1_inst_sram));
 #endif

 	return len;
 }

 static int __init l1sram_proc_init(void)
 {
 	struct proc_dir_entry *ptr;
 	ptr = create_proc_entry("sram", S_IFREG | S_IRUGO, NULL);
 	if (!ptr) {
 		printk(KERN_WARNING "unable to create /proc/sram\n");
 		return -1;
 	}
 	ptr->owner = THIS_MODULE;
 	ptr->read_proc = l1sram_proc_read;
 	return 0;
 }
 late_initcall(l1sram_proc_init);
 #endif
	/*
	* File: arch/blackfin/mm/blackfin_sram.c
	* Based on:
	* Author:
	*
	* Created:
	* Description: SRAM driver for Blackfin ADSP-BF5xx
	*
	* Modified:
	* Copyright 2004-2007 Analog Devices Inc.
	*
	* Bugs: Enter bugs at http://blackfin.uclinux.org/
	*
	* 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.
	*
	* 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, see the file COPYING, or write
	* to the Free Software Foundation, Inc.,
	* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/types.h>
	#include <linux/miscdevice.h>
	#include <linux/ioport.h>
	#include <linux/fcntl.h>
	#include <linux/init.h>
	#include <linux/poll.h>
	#include <linux/proc_fs.h>
	#include <linux/spinlock.h>
	#include <linux/rtc.h>
	#include <asm/blackfin.h>
	#include "blackfin_sram.h"

	spinlock_t l1sram_lock, l1_data_sram_lock, l1_inst_sram_lock;

	#if CONFIG_L1_MAX_PIECE < 16
	#undef CONFIG_L1_MAX_PIECE
	#define CONFIG_L1_MAX_PIECE 16
	#endif

	#if CONFIG_L1_MAX_PIECE > 1024
	#undef CONFIG_L1_MAX_PIECE
	#define CONFIG_L1_MAX_PIECE 1024
	#endif

	#define SRAM_SLT_NULL 0
	#define SRAM_SLT_FREE 1
	#define SRAM_SLT_ALLOCATED 2

	/* the data structure for L1 scratchpad and DATA SRAM */
	struct l1_sram_piece {
	void *paddr;
	int size;
	int flag;
	pid_t pid;
	};

	static struct l1_sram_piece l1_ssram[CONFIG_L1_MAX_PIECE];

	#if L1_DATA_A_LENGTH != 0
	static struct l1_sram_piece l1_data_A_sram[CONFIG_L1_MAX_PIECE];
	#endif

	#if L1_DATA_B_LENGTH != 0
	static struct l1_sram_piece l1_data_B_sram[CONFIG_L1_MAX_PIECE];
	#endif

	#if L1_CODE_LENGTH != 0
	static struct l1_sram_piece l1_inst_sram[CONFIG_L1_MAX_PIECE];
	#endif

	/* L1 Scratchpad SRAM initialization function */
	void __init l1sram_init(void)
	{
	printk(KERN_INFO "Blackfin Scratchpad data SRAM: %d KB\n",
	L1_SCRATCH_LENGTH >> 10);

	memset(&l1_ssram, 0x00, sizeof(l1_ssram));
	l1_ssram[0].paddr = (void *)L1_SCRATCH_START;
	l1_ssram[0].size = L1_SCRATCH_LENGTH;
	l1_ssram[0].flag = SRAM_SLT_FREE;

	/* mutex initialize */
	spin_lock_init(&l1sram_lock);
	}

	void __init l1_data_sram_init(void)
	{
	#if L1_DATA_A_LENGTH != 0
	memset(&l1_data_A_sram, 0x00, sizeof(l1_data_A_sram));
	l1_data_A_sram[0].paddr = (void *)L1_DATA_A_START +
	(_ebss_l1 - _sdata_l1);
	l1_data_A_sram[0].size = L1_DATA_A_LENGTH - (_ebss_l1 - _sdata_l1);
	l1_data_A_sram[0].flag = SRAM_SLT_FREE;

	printk(KERN_INFO "Blackfin Data A SRAM: %d KB (%d KB free)\n",
	L1_DATA_A_LENGTH >> 10, l1_data_A_sram[0].size >> 10);
	#endif
	#if L1_DATA_B_LENGTH != 0
	memset(&l1_data_B_sram, 0x00, sizeof(l1_data_B_sram));
	l1_data_B_sram[0].paddr = (void *)L1_DATA_B_START +
	(_ebss_b_l1 - _sdata_b_l1);
	l1_data_B_sram[0].size = L1_DATA_B_LENGTH - (_ebss_b_l1 - _sdata_b_l1);
	l1_data_B_sram[0].flag = SRAM_SLT_FREE;

	printk(KERN_INFO "Blackfin Data B SRAM: %d KB (%d KB free)\n",
	L1_DATA_B_LENGTH >> 10, l1_data_B_sram[0].size >> 10);
	#endif

	/* mutex initialize */
	spin_lock_init(&l1_data_sram_lock);
	}

	void __init l1_inst_sram_init(void)
	{
	#if L1_CODE_LENGTH != 0
	memset(&l1_inst_sram, 0x00, sizeof(l1_inst_sram));
	l1_inst_sram[0].paddr = (void *)L1_CODE_START + (_etext_l1 - _stext_l1);
	l1_inst_sram[0].size = L1_CODE_LENGTH - (_etext_l1 - _stext_l1);
	l1_inst_sram[0].flag = SRAM_SLT_FREE;

	printk(KERN_INFO "Blackfin Instruction SRAM: %d KB (%d KB free)\n",
	L1_CODE_LENGTH >> 10, l1_inst_sram[0].size >> 10);
	#endif

	/* mutex initialize */
	spin_lock_init(&l1_inst_sram_lock);
	}

	/* L1 memory allocate function */
	static void _l1_sram_alloc(size_t size, struct l1_sram_piece pfree, int count)
	{
	int i, index = 0;
	void *addr = NULL;

	if (size <= 0)
	return NULL;

	/* Align the size */
	size = (size + 3) & ~3;

	/* not use the good method to match the best slot !!! */
	/* search an available memory slot */
	for (i = 0; i < count; i++) {
	if ((pfree[i].flag == SRAM_SLT_FREE)
	&& (pfree[i].size >= size)) {
	addr = pfree[i].paddr;
	pfree[i].flag = SRAM_SLT_ALLOCATED;
	pfree[i].pid = current->pid;
	index = i;
	break;
	}
	}
	if (i >= count)
	return NULL;

	/* updated the NULL memory slot !!! */
	if (pfree[i].size > size) {
	for (i = 0; i < count; i++) {
	if (pfree[i].flag == SRAM_SLT_NULL) {
	pfree[i].pid = 0;
	pfree[i].flag = SRAM_SLT_FREE;
	pfree[i].paddr = addr + size;
	pfree[i].size = pfree[index].size - size;
	pfree[index].size = size;
	break;
	}
	}
	}

	return addr;
	}

	/* Allocate the largest available block. */
	static void _l1_sram_alloc_max(struct l1_sram_piece pfree, int count,
	unsigned long *psize)
	{
	unsigned long best = 0;
	int i, index = -1;
	void *addr = NULL;

	/* search an available memory slot */
	for (i = 0; i < count; i++) {
	if (pfree[i].flag == SRAM_SLT_FREE && pfree[i].size > best) {
	addr = pfree[i].paddr;
	index = i;
	best = pfree[i].size;
	}
	}
	if (index < 0)
	return NULL;
	*psize = best;

	pfree[index].pid = current->pid;
	pfree[index].flag = SRAM_SLT_ALLOCATED;
	return addr;
	}

	/* L1 memory free function */
	static int _l1_sram_free(const void *addr,
	struct l1_sram_piece *pfree,
	int count)
	{
	int i, index = 0;

	/* search the relevant memory slot */
	for (i = 0; i < count; i++) {
	if (pfree[i].paddr == addr) {
	if (pfree[i].flag != SRAM_SLT_ALLOCATED) {
	/* error log */
	return -1;
	}
	index = i;
	break;
	}
	}
	if (i >= count)
	return -1;

	pfree[index].pid = 0;
	pfree[index].flag = SRAM_SLT_FREE;

	/* link the next address slot */
	for (i = 0; i < count; i++) {
	if (((pfree[index].paddr + pfree[index].size) == pfree[i].paddr)
	&& (pfree[i].flag == SRAM_SLT_FREE)) {
	pfree[i].pid = 0;
	pfree[i].flag = SRAM_SLT_NULL;
	pfree[index].size += pfree[i].size;
	pfree[index].flag = SRAM_SLT_FREE;
	break;
	}
	}

	/* link the last address slot */
	for (i = 0; i < count; i++) {
	if (((pfree[i].paddr + pfree[i].size) == pfree[index].paddr) &&
	(pfree[i].flag == SRAM_SLT_FREE)) {
	pfree[index].flag = SRAM_SLT_NULL;
	pfree[i].size += pfree[index].size;
	break;
	}
	}

	return 0;
	}

	int sram_free(const void *addr)
	{
	if (0) {}
	#if L1_CODE_LENGTH != 0
	else if (addr >= (void *)L1_CODE_START
	&& addr < (void *)(L1_CODE_START + L1_CODE_LENGTH))
	return l1_inst_sram_free(addr);
	#endif
	#if L1_DATA_A_LENGTH != 0
	else if (addr >= (void *)L1_DATA_A_START
	&& addr < (void *)(L1_DATA_A_START + L1_DATA_A_LENGTH))
	return l1_data_A_sram_free(addr);
	#endif
	#if L1_DATA_B_LENGTH != 0
	else if (addr >= (void *)L1_DATA_B_START
	&& addr < (void *)(L1_DATA_B_START + L1_DATA_B_LENGTH))
	return l1_data_B_sram_free(addr);
	#endif
	else
	return -1;
	}
	EXPORT_SYMBOL(sram_free);

	void *l1_data_A_sram_alloc(size_t size)
	{
	unsigned flags;
	void *addr = NULL;

	/* add mutex operation */
	spin_lock_irqsave(&l1_data_sram_lock, flags);

	#if L1_DATA_A_LENGTH != 0
	addr = _l1_sram_alloc(size, l1_data_A_sram, ARRAY_SIZE(l1_data_A_sram));
	#endif

	/* add mutex operation */
	spin_unlock_irqrestore(&l1_data_sram_lock, flags);

	pr_debug("Allocated address in l1_data_A_sram_alloc is 0x%lx+0x%lx\n",
	(long unsigned int)addr, size);

	return addr;
	}
	EXPORT_SYMBOL(l1_data_A_sram_alloc);

	int l1_data_A_sram_free(const void *addr)
	{
	unsigned flags;
	int ret;

	/* add mutex operation */
	spin_lock_irqsave(&l1_data_sram_lock, flags);

	#if L1_DATA_A_LENGTH != 0
	ret = _l1_sram_free(addr,
	l1_data_A_sram, ARRAY_SIZE(l1_data_A_sram));
	#else
	ret = -1;
	#endif

	/* add mutex operation */
	spin_unlock_irqrestore(&l1_data_sram_lock, flags);

	return ret;
	}
	EXPORT_SYMBOL(l1_data_A_sram_free);

	void *l1_data_B_sram_alloc(size_t size)
	{
	#if L1_DATA_B_LENGTH != 0
	unsigned flags;
	void *addr;

	/* add mutex operation */
	spin_lock_irqsave(&l1_data_sram_lock, flags);

	addr = _l1_sram_alloc(size, l1_data_B_sram, ARRAY_SIZE(l1_data_B_sram));

	/* add mutex operation */
	spin_unlock_irqrestore(&l1_data_sram_lock, flags);

	pr_debug("Allocated address in l1_data_B_sram_alloc is 0x%lx+0x%lx\n",
	(long unsigned int)addr, size);

	return addr;
	#else
	return NULL;
	#endif
	}
	EXPORT_SYMBOL(l1_data_B_sram_alloc);

	int l1_data_B_sram_free(const void *addr)
	{
	#if L1_DATA_B_LENGTH != 0
	unsigned flags;
	int ret;

	/* add mutex operation */
	spin_lock_irqsave(&l1_data_sram_lock, flags);

	ret = _l1_sram_free(addr, l1_data_B_sram, ARRAY_SIZE(l1_data_B_sram));

	/* add mutex operation */
	spin_unlock_irqrestore(&l1_data_sram_lock, flags);

	return ret;
	#else
	return -1;
	#endif
	}
	EXPORT_SYMBOL(l1_data_B_sram_free);

	void *l1_data_sram_alloc(size_t size)
	{
	void *addr = l1_data_A_sram_alloc(size);

	if (!addr)
	addr = l1_data_B_sram_alloc(size);

	return addr;
	}
	EXPORT_SYMBOL(l1_data_sram_alloc);

	void *l1_data_sram_zalloc(size_t size)
	{
	void *addr = l1_data_sram_alloc(size);

	if (addr)
	memset(addr, 0x00, size);

	return addr;
	}
	EXPORT_SYMBOL(l1_data_sram_zalloc);

	int l1_data_sram_free(const void *addr)
	{
	int ret;
	ret = l1_data_A_sram_free(addr);
	if (ret == -1)
	ret = l1_data_B_sram_free(addr);
	return ret;
	}
	EXPORT_SYMBOL(l1_data_sram_free);

	void *l1_inst_sram_alloc(size_t size)
	{
	#if L1_DATA_A_LENGTH != 0
	unsigned flags;
	void *addr;

	/* add mutex operation */
	spin_lock_irqsave(&l1_inst_sram_lock, flags);

	addr = _l1_sram_alloc(size, l1_inst_sram, ARRAY_SIZE(l1_inst_sram));

	/* add mutex operation */
	spin_unlock_irqrestore(&l1_inst_sram_lock, flags);

	pr_debug("Allocated address in l1_inst_sram_alloc is 0x%lx+0x%lx\n",
	(long unsigned int)addr, size);

	return addr;
	#else
	return NULL;
	#endif
	}
	EXPORT_SYMBOL(l1_inst_sram_alloc);

	int l1_inst_sram_free(const void *addr)
	{
	#if L1_CODE_LENGTH != 0
	unsigned flags;
	int ret;

	/* add mutex operation */
	spin_lock_irqsave(&l1_inst_sram_lock, flags);

	ret = _l1_sram_free(addr, l1_inst_sram, ARRAY_SIZE(l1_inst_sram));

	/* add mutex operation */
	spin_unlock_irqrestore(&l1_inst_sram_lock, flags);

	return ret;
	#else
	return -1;
	#endif
	}
	EXPORT_SYMBOL(l1_inst_sram_free);

	/* L1 Scratchpad memory allocate function */
	void *l1sram_alloc(size_t size)
	{
	unsigned flags;
	void *addr;

	/* add mutex operation */
	spin_lock_irqsave(&l1sram_lock, flags);

	addr = _l1_sram_alloc(size, l1_ssram, ARRAY_SIZE(l1_ssram));

	/* add mutex operation */
	spin_unlock_irqrestore(&l1sram_lock, flags);

	return addr;
	}

	/* L1 Scratchpad memory allocate function */
	void l1sram_alloc_max(size_t psize)
	{
	unsigned flags;
	void *addr;

	/* add mutex operation */
	spin_lock_irqsave(&l1sram_lock, flags);

	addr = _l1_sram_alloc_max(l1_ssram, ARRAY_SIZE(l1_ssram), psize);

	/* add mutex operation */
	spin_unlock_irqrestore(&l1sram_lock, flags);

	return addr;
	}

	/* L1 Scratchpad memory free function */
	int l1sram_free(const void *addr)
	{
	unsigned flags;
	int ret;

	/* add mutex operation */
	spin_lock_irqsave(&l1sram_lock, flags);

	ret = _l1_sram_free(addr, l1_ssram, ARRAY_SIZE(l1_ssram));

	/* add mutex operation */
	spin_unlock_irqrestore(&l1sram_lock, flags);

	return ret;
	}

	int sram_free_with_lsl(const void *addr)
	{
	struct sram_list_struct lsl, *tmp;
	struct mm_struct *mm = current->mm;

	for (tmp = &mm->context.sram_list; tmp; tmp = &(tmp)->next)
	if ((*tmp)->addr == addr)
	goto found;
	return -1;
	found:
	lsl = *tmp;
	sram_free(addr);
	*tmp = lsl->next;
	kfree(lsl);

	return 0;
	}
	EXPORT_SYMBOL(sram_free_with_lsl);

	void *sram_alloc_with_lsl(size_t size, unsigned long flags)
	{
	void *addr = NULL;
	struct sram_list_struct *lsl = NULL;
	struct mm_struct *mm = current->mm;

	lsl = kzalloc(sizeof(struct sram_list_struct), GFP_KERNEL);
	if (!lsl)
	return NULL;

	if (flags & L1_INST_SRAM)
	addr = l1_inst_sram_alloc(size);

	if (addr == NULL && (flags & L1_DATA_A_SRAM))
	addr = l1_data_A_sram_alloc(size);

	if (addr == NULL && (flags & L1_DATA_B_SRAM))
	addr = l1_data_B_sram_alloc(size);

	if (addr == NULL) {
	kfree(lsl);
	return NULL;
	}
	lsl->addr = addr;
	lsl->length = size;
	lsl->next = mm->context.sram_list;
	mm->context.sram_list = lsl;
	return addr;
	}
	EXPORT_SYMBOL(sram_alloc_with_lsl);

	#ifdef CONFIG_PROC_FS
	/* Once we get a real allocator, we'll throw all of this away.
	* Until then, we need some sort of visibility into the L1 alloc.
	*/
	static void _l1sram_proc_read(char buf, int len, const char *desc,
	struct l1_sram_piece *pfree, const int array_size)
	{
	int i;

	len += sprintf(&buf[len], "--- L1 %-14s Size PID State\n", desc);
	for (i = 0; i < array_size; ++i) {
	const char *alloc_type;
	switch (pfree[i].flag) {
	case SRAM_SLT_NULL: alloc_type = "NULL"; break;
	case SRAM_SLT_FREE: alloc_type = "FREE"; break;
	case SRAM_SLT_ALLOCATED: alloc_type = "ALLOCATED"; break;
	default: alloc_type = "????"; break;
	}
	len += sprintf(&buf[len], "%p-%p %8i %4i %s\n",
	pfree[i].paddr, pfree[i].paddr + pfree[i].size,
	pfree[i].size, pfree[i].pid, alloc_type);
	}
	}
	static int l1sram_proc_read(char buf, char *start, off_t offset, int count,
	int eof, void data)
	{
	int len = 0;

	_l1sram_proc_read(buf, &len, "Scratchpad",
	l1_ssram, ARRAY_SIZE(l1_ssram));
	#if L1_DATA_A_LENGTH != 0
	_l1sram_proc_read(buf, &len, "Data A",
	l1_data_A_sram, ARRAY_SIZE(l1_data_A_sram));
	#endif
	#if L1_DATA_B_LENGTH != 0
	_l1sram_proc_read(buf, &len, "Data B",
	l1_data_B_sram, ARRAY_SIZE(l1_data_B_sram));
	#endif
	#if L1_CODE_LENGTH != 0
	_l1sram_proc_read(buf, &len, "Instruction",
	l1_inst_sram, ARRAY_SIZE(l1_inst_sram));
	#endif

	return len;
	}

	static int __init l1sram_proc_init(void)
	{
	struct proc_dir_entry *ptr;
	ptr = create_proc_entry("sram", S_IFREG \| S_IRUGO, NULL);
	if (!ptr) {
	printk(KERN_WARNING "unable to create /proc/sram\n");
	return -1;
	}
	ptr->owner = THIS_MODULE;
	ptr->read_proc = l1sram_proc_read;
	return 0;
	}
	late_initcall(l1sram_proc_init);
	#endif