summaryrefslogtreecommitdiff
path: root/arch/blackfin/mm/blackfin_sram.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/blackfin/mm/blackfin_sram.c')
-rw-r--r--arch/blackfin/mm/blackfin_sram.c540
1 files changed, 540 insertions, 0 deletions
diff --git a/arch/blackfin/mm/blackfin_sram.c b/arch/blackfin/mm/blackfin_sram.c
new file mode 100644
index 000000000000..dd0c6501c424
--- /dev/null
+++ b/arch/blackfin/mm/blackfin_sram.c
@@ -0,0 +1,540 @@
+/*
+ * File: arch/blackfin/mm/blackfin_sram.c
+ * Based on:
+ * Author:
+ *
+ * Created:
+ * Description: SRAM driver for Blackfin ADSP-BF5xx
+ *
+ * Modified:
+ * Copyright 2004-2006 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/autoconf.h>
+#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;
+};
+
+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 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 l1_data_sram_init(void)
+{
+#if L1_DATA_A_LENGTH != 0
+ printk(KERN_INFO "Blackfin DATA_A SRAM: %d KB\n",
+ L1_DATA_A_LENGTH >> 10);
+
+ 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;
+#endif
+#if L1_DATA_B_LENGTH != 0
+ printk(KERN_INFO "Blackfin DATA_B SRAM: %d KB\n",
+ L1_DATA_B_LENGTH >> 10);
+
+ memset(&l1_data_B_sram, 0x00, sizeof(l1_data_B_sram));
+ l1_data_B_sram[0].paddr = (void*)L1_DATA_B_START;
+ l1_data_B_sram[0].size = L1_DATA_B_LENGTH;
+ l1_data_B_sram[0].flag = SRAM_SLT_FREE;
+#endif
+
+ /* mutex initialize */
+ spin_lock_init(&l1_data_sram_lock);
+}
+
+void l1_inst_sram_init(void)
+{
+#if L1_CODE_LENGTH != 0
+ printk(KERN_INFO "Blackfin Instruction SRAM: %d KB\n",
+ L1_CODE_LENGTH >> 10);
+
+ 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;
+#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 memeory 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;
+ index = i;
+ break;
+ }
+ }
+ if (i >= count)
+ return NULL;
+
+ /* updated the NULL memeory slot !!! */
+ if (pfree[i].size > size) {
+ for (i = 0; i < count; i++) {
+ if (pfree[i].flag == SRAM_SLT_NULL) {
+ 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 memeory 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].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].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].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 = kmalloc(sizeof(struct sram_list_struct), GFP_KERNEL);
+ if (!lsl)
+ return NULL;
+ memset(lsl, 0, sizeof(*lsl));
+
+ 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);