2 * File: arch/blackfin/mm/blackfin_sram.c
7 * Description: SRAM driver for Blackfin ADSP-BF5xx
10 * Copyright 2004-2006 Analog Devices Inc.
12 * Bugs: Enter bugs at http://blackfin.uclinux.org/
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, see the file COPYING, or write
26 * to the Free Software Foundation, Inc.,
27 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
30 #include <linux/autoconf.h>
31 #include <linux/module.h>
32 #include <linux/kernel.h>
33 #include <linux/types.h>
34 #include <linux/miscdevice.h>
35 #include <linux/ioport.h>
36 #include <linux/fcntl.h>
37 #include <linux/init.h>
38 #include <linux/poll.h>
39 #include <linux/proc_fs.h>
40 #include <linux/spinlock.h>
41 #include <linux/rtc.h>
42 #include <asm/blackfin.h>
43 #include "blackfin_sram.h"
45 spinlock_t l1sram_lock, l1_data_sram_lock, l1_inst_sram_lock;
47 #if CONFIG_L1_MAX_PIECE < 16
48 #undef CONFIG_L1_MAX_PIECE
49 #define CONFIG_L1_MAX_PIECE 16
52 #if CONFIG_L1_MAX_PIECE > 1024
53 #undef CONFIG_L1_MAX_PIECE
54 #define CONFIG_L1_MAX_PIECE 1024
57 #define SRAM_SLT_NULL 0
58 #define SRAM_SLT_FREE 1
59 #define SRAM_SLT_ALLOCATED 2
61 /* the data structure for L1 scratchpad and DATA SRAM */
62 struct l1_sram_piece {
68 static struct l1_sram_piece l1_ssram[CONFIG_L1_MAX_PIECE];
70 #if L1_DATA_A_LENGTH != 0
71 static struct l1_sram_piece l1_data_A_sram[CONFIG_L1_MAX_PIECE];
74 #if L1_DATA_B_LENGTH != 0
75 static struct l1_sram_piece l1_data_B_sram[CONFIG_L1_MAX_PIECE];
78 #if L1_CODE_LENGTH != 0
79 static struct l1_sram_piece l1_inst_sram[CONFIG_L1_MAX_PIECE];
82 /* L1 Scratchpad SRAM initialization function */
83 void l1sram_init(void)
85 printk(KERN_INFO "Blackfin Scratchpad data SRAM: %d KB\n",
86 L1_SCRATCH_LENGTH >> 10);
88 memset(&l1_ssram, 0x00, sizeof(l1_ssram));
89 l1_ssram[0].paddr = (void*)L1_SCRATCH_START;
90 l1_ssram[0].size = L1_SCRATCH_LENGTH;
91 l1_ssram[0].flag = SRAM_SLT_FREE;
93 /* mutex initialize */
94 spin_lock_init(&l1sram_lock);
97 void l1_data_sram_init(void)
99 #if L1_DATA_A_LENGTH != 0
100 printk(KERN_INFO "Blackfin DATA_A SRAM: %d KB\n",
101 L1_DATA_A_LENGTH >> 10);
103 memset(&l1_data_A_sram, 0x00, sizeof(l1_data_A_sram));
104 l1_data_A_sram[0].paddr = (void*)L1_DATA_A_START +
105 (_ebss_l1 - _sdata_l1);
106 l1_data_A_sram[0].size = L1_DATA_A_LENGTH - (_ebss_l1 - _sdata_l1);
107 l1_data_A_sram[0].flag = SRAM_SLT_FREE;
109 #if L1_DATA_B_LENGTH != 0
110 printk(KERN_INFO "Blackfin DATA_B SRAM: %d KB\n",
111 L1_DATA_B_LENGTH >> 10);
113 memset(&l1_data_B_sram, 0x00, sizeof(l1_data_B_sram));
114 l1_data_B_sram[0].paddr = (void*)L1_DATA_B_START;
115 l1_data_B_sram[0].size = L1_DATA_B_LENGTH;
116 l1_data_B_sram[0].flag = SRAM_SLT_FREE;
119 /* mutex initialize */
120 spin_lock_init(&l1_data_sram_lock);
123 void l1_inst_sram_init(void)
125 #if L1_CODE_LENGTH != 0
126 printk(KERN_INFO "Blackfin Instruction SRAM: %d KB\n",
127 L1_CODE_LENGTH >> 10);
129 memset(&l1_inst_sram, 0x00, sizeof(l1_inst_sram));
130 l1_inst_sram[0].paddr = (void*)L1_CODE_START + (_etext_l1 - _stext_l1);
131 l1_inst_sram[0].size = L1_CODE_LENGTH - (_etext_l1 - _stext_l1);
132 l1_inst_sram[0].flag = SRAM_SLT_FREE;
135 /* mutex initialize */
136 spin_lock_init(&l1_inst_sram_lock);
139 /* L1 memory allocate function */
140 static void *_l1_sram_alloc(size_t size, struct l1_sram_piece *pfree, int count)
149 size = (size + 3) & ~3;
151 /* not use the good method to match the best slot !!! */
152 /* search an available memeory slot */
153 for (i = 0; i < count; i++) {
154 if ((pfree[i].flag == SRAM_SLT_FREE)
155 && (pfree[i].size >= size)) {
156 addr = pfree[i].paddr;
157 pfree[i].flag = SRAM_SLT_ALLOCATED;
165 /* updated the NULL memeory slot !!! */
166 if (pfree[i].size > size) {
167 for (i = 0; i < count; i++) {
168 if (pfree[i].flag == SRAM_SLT_NULL) {
169 pfree[i].flag = SRAM_SLT_FREE;
170 pfree[i].paddr = addr + size;
171 pfree[i].size = pfree[index].size - size;
172 pfree[index].size = size;
181 /* Allocate the largest available block. */
182 static void *_l1_sram_alloc_max(struct l1_sram_piece *pfree, int count,
183 unsigned long *psize)
185 unsigned long best = 0;
189 /* search an available memeory slot */
190 for (i = 0; i < count; i++) {
191 if (pfree[i].flag == SRAM_SLT_FREE && pfree[i].size > best) {
192 addr = pfree[i].paddr;
194 best = pfree[i].size;
201 pfree[index].flag = SRAM_SLT_ALLOCATED;
205 /* L1 memory free function */
206 static int _l1_sram_free(const void *addr,
207 struct l1_sram_piece *pfree, int count)
211 /* search the relevant memory slot */
212 for (i = 0; i < count; i++) {
213 if (pfree[i].paddr == addr) {
214 if (pfree[i].flag != SRAM_SLT_ALLOCATED) {
225 pfree[index].flag = SRAM_SLT_FREE;
227 /* link the next address slot */
228 for (i = 0; i < count; i++) {
229 if (((pfree[index].paddr + pfree[index].size) == pfree[i].paddr)
230 && (pfree[i].flag == SRAM_SLT_FREE)) {
231 pfree[i].flag = SRAM_SLT_NULL;
232 pfree[index].size += pfree[i].size;
233 pfree[index].flag = SRAM_SLT_FREE;
238 /* link the last address slot */
239 for (i = 0; i < count; i++) {
240 if (((pfree[i].paddr + pfree[i].size) == pfree[index].paddr) &&
241 (pfree[i].flag == SRAM_SLT_FREE)) {
242 pfree[index].flag = SRAM_SLT_NULL;
243 pfree[i].size += pfree[index].size;
251 int sram_free(const void *addr)
254 #if L1_CODE_LENGTH != 0
255 else if (addr >= (void *)L1_CODE_START
256 && addr < (void *)(L1_CODE_START + L1_CODE_LENGTH))
257 return l1_inst_sram_free(addr);
259 #if L1_DATA_A_LENGTH != 0
260 else if (addr >= (void *)L1_DATA_A_START
261 && addr < (void *)(L1_DATA_A_START + L1_DATA_A_LENGTH))
262 return l1_data_A_sram_free(addr);
264 #if L1_DATA_B_LENGTH != 0
265 else if (addr >= (void *)L1_DATA_B_START
266 && addr < (void *)(L1_DATA_B_START + L1_DATA_B_LENGTH))
267 return l1_data_B_sram_free(addr);
272 EXPORT_SYMBOL(sram_free);
274 void *l1_data_A_sram_alloc(size_t size)
279 /* add mutex operation */
280 spin_lock_irqsave(&l1_data_sram_lock, flags);
282 #if L1_DATA_A_LENGTH != 0
283 addr = _l1_sram_alloc(size, l1_data_A_sram, ARRAY_SIZE(l1_data_A_sram));
286 /* add mutex operation */
287 spin_unlock_irqrestore(&l1_data_sram_lock, flags);
289 pr_debug("Allocated address in l1_data_A_sram_alloc is 0x%lx+0x%lx\n",
290 (long unsigned int)addr, size);
294 EXPORT_SYMBOL(l1_data_A_sram_alloc);
296 int l1_data_A_sram_free(const void *addr)
301 /* add mutex operation */
302 spin_lock_irqsave(&l1_data_sram_lock, flags);
304 #if L1_DATA_A_LENGTH != 0
305 ret = _l1_sram_free(addr,
306 l1_data_A_sram, ARRAY_SIZE(l1_data_A_sram));
311 /* add mutex operation */
312 spin_unlock_irqrestore(&l1_data_sram_lock, flags);
316 EXPORT_SYMBOL(l1_data_A_sram_free);
318 void *l1_data_B_sram_alloc(size_t size)
320 #if L1_DATA_B_LENGTH != 0
324 /* add mutex operation */
325 spin_lock_irqsave(&l1_data_sram_lock, flags);
327 addr = _l1_sram_alloc(size, l1_data_B_sram, ARRAY_SIZE(l1_data_B_sram));
329 /* add mutex operation */
330 spin_unlock_irqrestore(&l1_data_sram_lock, flags);
332 pr_debug("Allocated address in l1_data_B_sram_alloc is 0x%lx+0x%lx\n",
333 (long unsigned int)addr, size);
340 EXPORT_SYMBOL(l1_data_B_sram_alloc);
342 int l1_data_B_sram_free(const void *addr)
344 #if L1_DATA_B_LENGTH != 0
348 /* add mutex operation */
349 spin_lock_irqsave(&l1_data_sram_lock, flags);
351 ret = _l1_sram_free(addr, l1_data_B_sram, ARRAY_SIZE(l1_data_B_sram));
353 /* add mutex operation */
354 spin_unlock_irqrestore(&l1_data_sram_lock, flags);
361 EXPORT_SYMBOL(l1_data_B_sram_free);
363 void *l1_data_sram_alloc(size_t size)
365 void *addr = l1_data_A_sram_alloc(size);
368 addr = l1_data_B_sram_alloc(size);
372 EXPORT_SYMBOL(l1_data_sram_alloc);
374 void *l1_data_sram_zalloc(size_t size)
376 void *addr = l1_data_sram_alloc(size);
379 memset(addr, 0x00, size);
383 EXPORT_SYMBOL(l1_data_sram_zalloc);
385 int l1_data_sram_free(const void *addr)
388 ret = l1_data_A_sram_free(addr);
390 ret = l1_data_B_sram_free(addr);
393 EXPORT_SYMBOL(l1_data_sram_free);
395 void *l1_inst_sram_alloc(size_t size)
397 #if L1_DATA_A_LENGTH != 0
401 /* add mutex operation */
402 spin_lock_irqsave(&l1_inst_sram_lock, flags);
404 addr = _l1_sram_alloc(size, l1_inst_sram, ARRAY_SIZE(l1_inst_sram));
406 /* add mutex operation */
407 spin_unlock_irqrestore(&l1_inst_sram_lock, flags);
409 pr_debug("Allocated address in l1_inst_sram_alloc is 0x%lx+0x%lx\n",
410 (long unsigned int)addr, size);
417 EXPORT_SYMBOL(l1_inst_sram_alloc);
419 int l1_inst_sram_free(const void *addr)
421 #if L1_CODE_LENGTH != 0
425 /* add mutex operation */
426 spin_lock_irqsave(&l1_inst_sram_lock, flags);
428 ret = _l1_sram_free(addr, l1_inst_sram, ARRAY_SIZE(l1_inst_sram));
430 /* add mutex operation */
431 spin_unlock_irqrestore(&l1_inst_sram_lock, flags);
438 EXPORT_SYMBOL(l1_inst_sram_free);
440 /* L1 Scratchpad memory allocate function */
441 void *l1sram_alloc(size_t size)
446 /* add mutex operation */
447 spin_lock_irqsave(&l1sram_lock, flags);
449 addr = _l1_sram_alloc(size, l1_ssram, ARRAY_SIZE(l1_ssram));
451 /* add mutex operation */
452 spin_unlock_irqrestore(&l1sram_lock, flags);
457 /* L1 Scratchpad memory allocate function */
458 void *l1sram_alloc_max(size_t *psize)
463 /* add mutex operation */
464 spin_lock_irqsave(&l1sram_lock, flags);
466 addr = _l1_sram_alloc_max(l1_ssram, ARRAY_SIZE(l1_ssram), psize);
468 /* add mutex operation */
469 spin_unlock_irqrestore(&l1sram_lock, flags);
474 /* L1 Scratchpad memory free function */
475 int l1sram_free(const void *addr)
480 /* add mutex operation */
481 spin_lock_irqsave(&l1sram_lock, flags);
483 ret = _l1_sram_free(addr, l1_ssram, ARRAY_SIZE(l1_ssram));
485 /* add mutex operation */
486 spin_unlock_irqrestore(&l1sram_lock, flags);
491 int sram_free_with_lsl(const void *addr)
493 struct sram_list_struct *lsl, **tmp;
494 struct mm_struct *mm = current->mm;
496 for (tmp = &mm->context.sram_list; *tmp; tmp = &(*tmp)->next)
497 if ((*tmp)->addr == addr)
508 EXPORT_SYMBOL(sram_free_with_lsl);
510 void *sram_alloc_with_lsl(size_t size, unsigned long flags)
513 struct sram_list_struct *lsl = NULL;
514 struct mm_struct *mm = current->mm;
516 lsl = kmalloc(sizeof(struct sram_list_struct), GFP_KERNEL);
519 memset(lsl, 0, sizeof(*lsl));
521 if (flags & L1_INST_SRAM)
522 addr = l1_inst_sram_alloc(size);
524 if (addr == NULL && (flags & L1_DATA_A_SRAM))
525 addr = l1_data_A_sram_alloc(size);
527 if (addr == NULL && (flags & L1_DATA_B_SRAM))
528 addr = l1_data_B_sram_alloc(size);
536 lsl->next = mm->context.sram_list;
537 mm->context.sram_list = lsl;
540 EXPORT_SYMBOL(sram_alloc_with_lsl);