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Diffstat (limited to '')
| -rw-r--r-- | arch/blackfin/mm/blackfin_sram.c | 540 |
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); |