Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/blackfin-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/blackfin-2.6: (30 commits)
  Blackfin arch: If we double fault, rather than hang forever, reset
  Blackfin arch: When icache is off, make sure people know it
  Blackfin arch: Fix bug - skip single step in high priority interrupt handler instead of disabling all interrupts in single step debugging.
  Blackfin arch: cache the values of vco/sclk/cclk as the overhead of doing so (~24 bytes) is worth avoiding the software mult/div routines
  Blackfin arch: fix bug - IMDMA is not type struct dma_register
  Blackfin arch: check the EXTBANKS field of the DDRCTL1 register to see if we are using both memory banks
  Blackfin arch: Apply Bluetechnix CM-BF527 board support patch
  Blackfin arch: Add unwinding for stack info, and a little more detail on trace buffer
  Blackfin arch: Add ISP1760 board resources to BF548-EZKIT
  Blackfin arch: fix bug - detect 0.1 silicon revision BF527-EZKIT as 0.0 version
  Blackfin arch: add missing IORESOURCE_MEM flags to UART3
  Blackfin arch: Add return value check in bfin_sir_probe(), remove SSYNC().
  Blackfin arch:  Extend sram malloc to handle L2 SRAM.
  Blackfin arch: Remove useless config option.
  Blackfin arch:  change L1 malloc to base on slab cache and lists.
  Blackfin arch: use local labels and ENDPROC() markings
  Blackfin arch: Do not need this dualcore test module in kernel.
  Blackfin arch: Allow ptrace to peek and poke application data in L1 data SRAM.
  Blackfin arch: Add ANOMALY_05000368 workaround
  Blackfin arch: Functional power management support
  ...

3 files changed, 381 insertions, 178 deletions

diff --git a/arch/blackfin/mm/blackfin_sram.c b/arch/blackfin/mm/blackfin_sram.c
index 3246f91..5af3c31 100644
--- a/arch/blackfin/mm/blackfin_sram.c
+++ b/arch/blackfin/mm/blackfin_sram.c
@@ -41,215 +41,309 @@
 #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
+static spinlock_t l1sram_lock, l1_data_sram_lock, l1_inst_sram_lock;
+static spinlock_t l2_sram_lock;
 
 /* the data structure for L1 scratchpad and DATA SRAM */
-struct l1_sram_piece {
+struct sram_piece {
 	void *paddr;
 	int size;
-	int flag;
 	pid_t pid;
+	struct sram_piece *next;
 };
 
-static struct l1_sram_piece l1_ssram[CONFIG_L1_MAX_PIECE];
+static struct sram_piece free_l1_ssram_head, used_l1_ssram_head;
 
 #if L1_DATA_A_LENGTH != 0
-static struct l1_sram_piece l1_data_A_sram[CONFIG_L1_MAX_PIECE];
+static struct sram_piece free_l1_data_A_sram_head, used_l1_data_A_sram_head;
 #endif
 
 #if L1_DATA_B_LENGTH != 0
-static struct l1_sram_piece l1_data_B_sram[CONFIG_L1_MAX_PIECE];
+static struct sram_piece free_l1_data_B_sram_head, used_l1_data_B_sram_head;
 #endif
 
 #if L1_CODE_LENGTH != 0
-static struct l1_sram_piece l1_inst_sram[CONFIG_L1_MAX_PIECE];
+static struct sram_piece free_l1_inst_sram_head, used_l1_inst_sram_head;
+#endif
+
+#ifdef L2_LENGTH
+static struct sram_piece free_l2_sram_head, used_l2_sram_head;
 #endif
 
+static struct kmem_cache *sram_piece_cache;
+
 /* L1 Scratchpad SRAM initialization function */
-void __init l1sram_init(void)
+static void __init l1sram_init(void)
 {
-	printk(KERN_INFO "Blackfin Scratchpad data SRAM: %d KB\n",
-	       L1_SCRATCH_LENGTH >> 10);
+	free_l1_ssram_head.next =
+		kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
+	if (!free_l1_ssram_head.next) {
+		printk(KERN_INFO"Fail to initialize Scratchpad data SRAM.\n");
+		return;
+	}
+
+	free_l1_ssram_head.next->paddr = (void *)L1_SCRATCH_START;
+	free_l1_ssram_head.next->size = L1_SCRATCH_LENGTH;
+	free_l1_ssram_head.next->pid = 0;
+	free_l1_ssram_head.next->next = NULL;
 
-	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;
+	used_l1_ssram_head.next = NULL;
 
 	/* mutex initialize */
 	spin_lock_init(&l1sram_lock);
+
+	printk(KERN_INFO "Blackfin Scratchpad data SRAM: %d KB\n",
+	       L1_SCRATCH_LENGTH >> 10);
 }
 
-void __init l1_data_sram_init(void)
+static 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);
+	free_l1_data_A_sram_head.next =
+		kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
+	if (!free_l1_data_A_sram_head.next) {
+		printk(KERN_INFO"Fail to initialize L1 Data A SRAM.\n");
+		return;
+	}
+
+	free_l1_data_A_sram_head.next->paddr =
+		(void *)L1_DATA_A_START + (_ebss_l1 - _sdata_l1);
+	free_l1_data_A_sram_head.next->size =
+		L1_DATA_A_LENGTH - (_ebss_l1 - _sdata_l1);
+	free_l1_data_A_sram_head.next->pid = 0;
+	free_l1_data_A_sram_head.next->next = NULL;
+
+	used_l1_data_A_sram_head.next = NULL;
+
+	printk(KERN_INFO "Blackfin L1 Data A SRAM: %d KB (%d KB free)\n",
+		L1_DATA_A_LENGTH >> 10,
+		free_l1_data_A_sram_head.next->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);
+	free_l1_data_B_sram_head.next =
+		kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
+	if (!free_l1_data_B_sram_head.next) {
+		printk(KERN_INFO"Fail to initialize L1 Data B SRAM.\n");
+		return;
+	}
+
+	free_l1_data_B_sram_head.next->paddr =
+		(void *)L1_DATA_B_START + (_ebss_b_l1 - _sdata_b_l1);
+	free_l1_data_B_sram_head.next->size =
+		L1_DATA_B_LENGTH - (_ebss_b_l1 - _sdata_b_l1);
+	free_l1_data_B_sram_head.next->pid = 0;
+	free_l1_data_B_sram_head.next->next = NULL;
+
+	used_l1_data_B_sram_head.next = NULL;
+
+	printk(KERN_INFO "Blackfin L1 Data B SRAM: %d KB (%d KB free)\n",
+		L1_DATA_B_LENGTH >> 10,
+		free_l1_data_B_sram_head.next->size >> 10);
 #endif
 
 	/* mutex initialize */
 	spin_lock_init(&l1_data_sram_lock);
 }
 
-void __init l1_inst_sram_init(void)
+static 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;
+	free_l1_inst_sram_head.next =
+		kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
+	if (!free_l1_inst_sram_head.next) {
+		printk(KERN_INFO"Fail to initialize L1 Instruction SRAM.\n");
+		return;
+	}
 
-	printk(KERN_INFO "Blackfin Instruction SRAM: %d KB (%d KB free)\n",
-	       L1_CODE_LENGTH >> 10, l1_inst_sram[0].size >> 10);
+	free_l1_inst_sram_head.next->paddr =
+		(void *)L1_CODE_START + (_etext_l1 - _stext_l1);
+	free_l1_inst_sram_head.next->size =
+		L1_CODE_LENGTH - (_etext_l1 - _stext_l1);
+	free_l1_inst_sram_head.next->pid = 0;
+	free_l1_inst_sram_head.next->next = NULL;
+
+	used_l1_inst_sram_head.next = NULL;
+
+	printk(KERN_INFO "Blackfin L1 Instruction SRAM: %d KB (%d KB free)\n",
+		L1_CODE_LENGTH >> 10,
+		free_l1_inst_sram_head.next->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)
+static void __init l2_sram_init(void)
 {
-	int i, index = 0;
-	void *addr = NULL;
+#ifdef L2_LENGTH
+	free_l2_sram_head.next =
+		kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
+	if (!free_l2_sram_head.next) {
+		printk(KERN_INFO"Fail to initialize L2 SRAM.\n");
+		return;
+	}
 
-	if (size <= 0)
+	free_l2_sram_head.next->paddr = (void *)L2_START +
+		(_etext_l2 - _stext_l2) + (_edata_l2 - _sdata_l2);
+	free_l2_sram_head.next->size = L2_LENGTH -
+		(_etext_l2 - _stext_l2) + (_edata_l2 - _sdata_l2);
+	free_l2_sram_head.next->pid = 0;
+	free_l2_sram_head.next->next = NULL;
+
+	used_l2_sram_head.next = NULL;
+
+	printk(KERN_INFO "Blackfin L2 SRAM: %d KB (%d KB free)\n",
+		L2_LENGTH >> 10,
+		free_l2_sram_head.next->size >> 10);
+#endif
+
+	/* mutex initialize */
+	spin_lock_init(&l2_sram_lock);
+}
+void __init bfin_sram_init(void)
+{
+	sram_piece_cache = kmem_cache_create("sram_piece_cache",
+				sizeof(struct sram_piece),
+				0, SLAB_PANIC, NULL);
+
+	l1sram_init();
+	l1_data_sram_init();
+	l1_inst_sram_init();
+	l2_sram_init();
+}
+
+/* SRAM allocate function */
+static void *_sram_alloc(size_t size, struct sram_piece *pfree_head,
+		struct sram_piece *pused_head)
+{
+	struct sram_piece *pslot, *plast, *pavail;
+
+	if (size <= 0 || !pfree_head || !pused_head)
 		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;
-		}
+	pslot = pfree_head->next;
+	plast = pfree_head;
+
+	/* search an available piece slot */
+	while (pslot != NULL && size > pslot->size) {
+		plast = pslot;
+		pslot = pslot->next;
 	}
-	if (i >= count)
+
+	if (!pslot)
 		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;
-			}
-		}
+	if (pslot->size == size) {
+		plast->next = pslot->next;
+		pavail = pslot;
+	} else {
+		pavail = kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
+
+		if (!pavail)
+			return NULL;
+
+		pavail->paddr = pslot->paddr;
+		pavail->size = size;
+		pslot->paddr += size;
+		pslot->size -= size;
 	}
 
-	return addr;
+	pavail->pid = current->pid;
+
+	pslot = pused_head->next;
+	plast = pused_head;
+
+	/* insert new piece into used piece list !!! */
+	while (pslot != NULL && pavail->paddr < pslot->paddr) {
+		plast = pslot;
+		pslot = pslot->next;
+	}
+
+	pavail->next = pslot;
+	plast->next = pavail;
+
+	return pavail->paddr;
 }
 
 /* Allocate the largest available block.  */
-static void *_l1_sram_alloc_max(struct l1_sram_piece *pfree, int count,
+static void *_sram_alloc_max(struct sram_piece *pfree_head,
+				struct sram_piece *pused_head,
 				unsigned long *psize)
 {
-	unsigned long best = 0;
-	int i, index = -1;
-	void *addr = NULL;
+	struct sram_piece *pslot, *pmax;
 
-	/* 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 (!pfree_head || !pused_head)
+		return NULL;
+
+	pmax = pslot = pfree_head->next;
+
+	/* search an available piece slot */
+	while (pslot != NULL) {
+		if (pslot->size > pmax->size)
+			pmax = pslot;
+		pslot = pslot->next;
 	}
-	if (index < 0)
+
+	if (!pmax)
 		return NULL;
-	*psize = best;
 
-	pfree[index].pid = current->pid;
-	pfree[index].flag = SRAM_SLT_ALLOCATED;
-	return addr;
+	*psize = pmax->size;
+
+	return _sram_alloc(*psize, pfree_head, pused_head);
 }
 
-/* L1 memory free function */
-static int _l1_sram_free(const void *addr,
-			struct l1_sram_piece *pfree,
-			int count)
+/* SRAM free function */
+static int _sram_free(const void *addr,
+			struct sram_piece *pfree_head,
+			struct sram_piece *pused_head)
 {
-	int i, index = 0;
+	struct sram_piece *pslot, *plast, *pavail;
+
+	if (!pfree_head || !pused_head)
+		return -1;
 
 	/* 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;
-		}
+	pslot = pused_head->next;
+	plast = pused_head;
+
+	/* search an available piece slot */
+	while (pslot != NULL && pslot->paddr != addr) {
+		plast = pslot;
+		pslot = pslot->next;
 	}
-	if (i >= count)
+
+	if (!pslot)
 		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;
-		}
+	plast->next = pslot->next;
+	pavail = pslot;
+	pavail->pid = 0;
+
+	/* insert free pieces back to the free list */
+	pslot = pfree_head->next;
+	plast = pfree_head;
+
+	while (pslot != NULL && addr > pslot->paddr) {
+		plast = pslot;
+		pslot = pslot->next;
+	}
+
+	if (plast != pfree_head && plast->paddr + plast->size == pavail->paddr) {
+		plast->size += pavail->size;
+		kmem_cache_free(sram_piece_cache, pavail);
+	} else {
+		pavail->next = plast;
+		plast->next = pavail;
+		plast = pavail;
 	}
 
-	/* 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;
-		}
+	if (pslot && plast->paddr + plast->size == pslot->paddr) {
+		plast->size += pslot->size;
+		plast->next = pslot->next;
+		kmem_cache_free(sram_piece_cache, pslot);
 	}
 
 	return 0;
@@ -273,6 +367,11 @@ int sram_free(const void *addr)
 		 && addr < (void *)(L1_DATA_B_START + L1_DATA_B_LENGTH))
 		return l1_data_B_sram_free(addr);
 #endif
+#ifdef L2_LENGTH
+	else if (addr >= (void *)L2_START
+		 && addr < (void *)(L2_START + L2_LENGTH))
+		return l2_sram_free(addr);
+#endif
 	else
 		return -1;
 }
@@ -287,7 +386,8 @@ void *l1_data_A_sram_alloc(size_t size)
 	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));
+	addr = _sram_alloc(size, &free_l1_data_A_sram_head,
+			&used_l1_data_A_sram_head);
 #endif
 
 	/* add mutex operation */
@@ -309,8 +409,8 @@ int l1_data_A_sram_free(const void *addr)
 	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));
+	ret = _sram_free(addr, &free_l1_data_A_sram_head,
+			&used_l1_data_A_sram_head);
 #else
 	ret = -1;
 #endif
@@ -331,7 +431,8 @@ void *l1_data_B_sram_alloc(size_t size)
 	/* 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));
+	addr = _sram_alloc(size, &free_l1_data_B_sram_head,
+			&used_l1_data_B_sram_head);
 
 	/* add mutex operation */
 	spin_unlock_irqrestore(&l1_data_sram_lock, flags);
@@ -355,7 +456,8 @@ int l1_data_B_sram_free(const void *addr)
 	/* 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));
+	ret = _sram_free(addr, &free_l1_data_B_sram_head,
+			&used_l1_data_B_sram_head);
 
 	/* add mutex operation */
 	spin_unlock_irqrestore(&l1_data_sram_lock, flags);
@@ -408,7 +510,8 @@ void *l1_inst_sram_alloc(size_t size)
 	/* add mutex operation */
 	spin_lock_irqsave(&l1_inst_sram_lock, flags);
 
-	addr = _l1_sram_alloc(size, l1_inst_sram, ARRAY_SIZE(l1_inst_sram));
+	addr = _sram_alloc(size, &free_l1_inst_sram_head,
+			&used_l1_inst_sram_head);
 
 	/* add mutex operation */
 	spin_unlock_irqrestore(&l1_inst_sram_lock, flags);
@@ -432,7 +535,8 @@ int l1_inst_sram_free(const void *addr)
 	/* add mutex operation */
 	spin_lock_irqsave(&l1_inst_sram_lock, flags);
 
-	ret = _l1_sram_free(addr, l1_inst_sram, ARRAY_SIZE(l1_inst_sram));
+	ret = _sram_free(addr, &free_l1_inst_sram_head,
+			&used_l1_inst_sram_head);
 
 	/* add mutex operation */
 	spin_unlock_irqrestore(&l1_inst_sram_lock, flags);
@@ -453,7 +557,8 @@ void *l1sram_alloc(size_t size)
 	/* add mutex operation */
 	spin_lock_irqsave(&l1sram_lock, flags);
 
-	addr = _l1_sram_alloc(size, l1_ssram, ARRAY_SIZE(l1_ssram));
+	addr = _sram_alloc(size, &free_l1_ssram_head,
+			&used_l1_ssram_head);
 
 	/* add mutex operation */
 	spin_unlock_irqrestore(&l1sram_lock, flags);
@@ -470,7 +575,8 @@ void *l1sram_alloc_max(size_t *psize)
 	/* add mutex operation */
 	spin_lock_irqsave(&l1sram_lock, flags);
 
-	addr = _l1_sram_alloc_max(l1_ssram, ARRAY_SIZE(l1_ssram), psize);
+	addr = _sram_alloc_max(&free_l1_ssram_head,
+			&used_l1_ssram_head, psize);
 
 	/* add mutex operation */
 	spin_unlock_irqrestore(&l1sram_lock, flags);
@@ -487,7 +593,8 @@ int l1sram_free(const void *addr)
 	/* add mutex operation */
 	spin_lock_irqsave(&l1sram_lock, flags);
 
-	ret = _l1_sram_free(addr, l1_ssram, ARRAY_SIZE(l1_ssram));
+	ret = _sram_free(addr, &free_l1_ssram_head,
+			&used_l1_ssram_head);
 
 	/* add mutex operation */
 	spin_unlock_irqrestore(&l1sram_lock, flags);
@@ -495,6 +602,64 @@ int l1sram_free(const void *addr)
 	return ret;
 }
 
+void *l2_sram_alloc(size_t size)
+{
+#ifdef L2_LENGTH
+	unsigned flags;
+	void *addr;
+
+	/* add mutex operation */
+	spin_lock_irqsave(&l2_sram_lock, flags);
+
+	addr = _sram_alloc(size, &free_l2_sram_head,
+			&used_l2_sram_head);
+
+	/* add mutex operation */
+	spin_unlock_irqrestore(&l2_sram_lock, flags);
+
+	pr_debug("Allocated address in l2_sram_alloc is 0x%lx+0x%lx\n",
+		 (long unsigned int)addr, size);
+
+	return addr;
+#else
+	return NULL;
+#endif
+}
+EXPORT_SYMBOL(l2_sram_alloc);
+
+void *l2_sram_zalloc(size_t size)
+{
+	void *addr = l2_sram_alloc(size);
+
+	if (addr)
+		memset(addr, 0x00, size);
+
+	return addr;
+}
+EXPORT_SYMBOL(l2_sram_zalloc);
+
+int l2_sram_free(const void *addr)
+{
+#ifdef L2_LENGTH
+	unsigned flags;
+	int ret;
+
+	/* add mutex operation */
+	spin_lock_irqsave(&l2_sram_lock, flags);
+
+	ret = _sram_free(addr, &free_l2_sram_head,
+			&used_l2_sram_head);
+
+	/* add mutex operation */
+	spin_unlock_irqrestore(&l2_sram_lock, flags);
+
+	return ret;
+#else
+	return -1;
+#endif
+}
+EXPORT_SYMBOL(l2_sram_free);
+
 int sram_free_with_lsl(const void *addr)
 {
 	struct sram_list_struct *lsl, **tmp;
@@ -533,6 +698,9 @@ void *sram_alloc_with_lsl(size_t size, unsigned long flags)
 	if (addr == NULL && (flags & L1_DATA_B_SRAM))
 		addr = l1_data_B_sram_alloc(size);
 
+	if (addr == NULL && (flags & L2_SRAM))
+		addr = l2_sram_alloc(size);
+
 	if (addr == NULL) {
 		kfree(lsl);
 		return NULL;
@@ -549,49 +717,80 @@ EXPORT_SYMBOL(sram_alloc_with_lsl);
 /* 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)
+/* Need to keep line of output the same.  Currently, that is 44 bytes
+ * (including newline).
+ */
+static int _sram_proc_read(char *buf, int *len, int count, const char *desc,
+		struct sram_piece *pfree_head,
+		struct sram_piece *pused_head)
 {
-	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);
+	struct sram_piece *pslot;
+
+	if (!pfree_head || !pused_head)
+		return -1;
+
+	*len += sprintf(&buf[*len], "--- SRAM %-14s Size   PID State     \n", desc);
+
+	/* search the relevant memory slot */
+	pslot = pused_head->next;
+
+	while (pslot != NULL) {
+		*len += sprintf(&buf[*len], "%p-%p %10i %5i %-10s\n",
+			pslot->paddr, pslot->paddr + pslot->size,
+			pslot->size, pslot->pid, "ALLOCATED");
+
+		pslot = pslot->next;
 	}
+
+	pslot = pfree_head->next;
+
+	while (pslot != NULL) {
+		*len += sprintf(&buf[*len], "%p-%p %10i %5i %-10s\n",
+			pslot->paddr, pslot->paddr + pslot->size,
+			pslot->size, pslot->pid, "FREE");
+
+		pslot = pslot->next;
+	}
+
+	return 0;
 }
-static int l1sram_proc_read(char *buf, char **start, off_t offset, int count,
+static int sram_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 (_sram_proc_read(buf, &len, count, "Scratchpad",
+			&free_l1_ssram_head, &used_l1_ssram_head))
+		goto not_done;
 #if L1_DATA_A_LENGTH != 0
-	_l1sram_proc_read(buf, &len, "Data A",
-			l1_data_A_sram, ARRAY_SIZE(l1_data_A_sram));
+	if (_sram_proc_read(buf, &len, count, "L1 Data A",
+			&free_l1_data_A_sram_head,
+			&used_l1_data_A_sram_head))
+		goto not_done;
 #endif
 #if L1_DATA_B_LENGTH != 0
-	_l1sram_proc_read(buf, &len, "Data B",
-			l1_data_B_sram, ARRAY_SIZE(l1_data_B_sram));
+	if (_sram_proc_read(buf, &len, count, "L1 Data B",
+			&free_l1_data_B_sram_head,
+			&used_l1_data_B_sram_head))
+		goto not_done;
 #endif
 #if L1_CODE_LENGTH != 0
-	_l1sram_proc_read(buf, &len, "Instruction",
-			l1_inst_sram, ARRAY_SIZE(l1_inst_sram));
+	if (_sram_proc_read(buf, &len, count, "L1 Instruction",
+			&free_l1_inst_sram_head, &used_l1_inst_sram_head))
+		goto not_done;
+#endif
+#ifdef L2_LENGTH
+	if (_sram_proc_read(buf, &len, count, "L2",
+			&free_l2_sram_head, &used_l2_sram_head))
+		goto not_done;
 #endif
 
+	*eof = 1;
+ not_done:
 	return len;
 }
 
-static int __init l1sram_proc_init(void)
+static int __init sram_proc_init(void)
 {
 	struct proc_dir_entry *ptr;
 	ptr = create_proc_entry("sram", S_IFREG | S_IRUGO, NULL);
@@ -600,8 +799,8 @@ static int __init l1sram_proc_init(void)
 		return -1;
 	}
 	ptr->owner = THIS_MODULE;
-	ptr->read_proc = l1sram_proc_read;
+	ptr->read_proc = sram_proc_read;
 	return 0;
 }
-late_initcall(l1sram_proc_init);
+late_initcall(sram_proc_init);
 #endif
diff --git a/arch/blackfin/mm/blackfin_sram.h b/arch/blackfin/mm/blackfin_sram.h
index 0fb73b7..8cb0945 100644
--- a/arch/blackfin/mm/blackfin_sram.h
+++ b/arch/blackfin/mm/blackfin_sram.h
@@ -30,9 +30,7 @@
 #ifndef __BLACKFIN_SRAM_H__
 #define __BLACKFIN_SRAM_H__
 
-extern void l1sram_init(void);
-extern void l1_inst_sram_init(void);
-extern void l1_data_sram_init(void);
+extern void bfin_sram_init(void);
 extern void *l1sram_alloc(size_t);
 
 #endif
diff --git a/arch/blackfin/mm/init.c b/arch/blackfin/mm/init.c
index 4d5326e..bc240ab 100644
--- a/arch/blackfin/mm/init.c
+++ b/arch/blackfin/mm/init.c
@@ -137,11 +137,14 @@ void __init mem_init(void)
 		"(%uk init code, %uk kernel code, %uk data, %uk dma, %uk reserved)\n",
 		(unsigned long) freepages << (PAGE_SHIFT-10), _ramend >> 10,
 		initk, codek, datak, DMA_UNCACHED_REGION >> 10, (reservedpages << (PAGE_SHIFT-10)));
+}
+
+static int __init sram_init(void)
+{
+	unsigned long tmp;
 
 	/* Initialize the blackfin L1 Memory. */
-	l1sram_init();
-	l1_data_sram_init();
-	l1_inst_sram_init();
+	bfin_sram_init();
 
 	/* Allocate this once; never free it.  We assume this gives us a
 	   pointer to the start of L1 scratchpad memory; panic if it
@@ -152,7 +155,10 @@ void __init mem_init(void)
 			tmp, (unsigned long)L1_SCRATCH_TASK_INFO);
 		panic("No L1, time to give up\n");
 	}
+
+	return 0;
 }
+pure_initcall(sram_init);
 
 static void __init free_init_pages(const char *what, unsigned long begin, unsigned long end)
 {