diff options
Diffstat (limited to 'arch/m68k/mach-mcfv4e/net/nbuf.c')
| -rw-r--r-- | arch/m68k/mach-mcfv4e/net/nbuf.c | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/arch/m68k/mach-mcfv4e/net/nbuf.c b/arch/m68k/mach-mcfv4e/net/nbuf.c new file mode 100644 index 0000000000..d7ae921bed --- /dev/null +++ b/arch/m68k/mach-mcfv4e/net/nbuf.c @@ -0,0 +1,239 @@ +/* + * Copyright (c) 2008 Carsten Schlote <c.schlote@konzeptpark.de> + * See file CREDITS for list of people who contributed to this project. + * + * This file is part of U-Boot V2. + * + * U-Boot V2 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 3 of the License, or + * (at your option) any later version. + * + * U-Boot V2 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 U-Boot V2. If not, see <http://www.gnu.org/licenses/>. + */ + +/** @file + * Implementation of network buffer scheme. + * @todo Obsolete this file + */ +#include <common.h> +#include <malloc.h> +#include <linux/types.h> + +#include <asm/proc/net/queue.h> +#include <asm/proc/net/net.h> + +#include <asm/arch/mcf54xx-regs.h> + + +#define ASSERT(x) + +/** + * Queues used for network buffer storage + */ +QUEUE nbuf_queue[NBUF_MAXQ]; + +/* + * Some devices require line-aligned buffers. In order to accomplish + * this, the nbuf data is over-allocated and adjusted. The following + * array keeps track of the original data pointer returned by malloc + */ +ADDRESS unaligned_buffers[NBUF_MAX]; + +/** + * Initialize all the network buffer queues + * + * Return Value: + * 0 success + * 1 failure + */ +int +nbuf_init(void) +{ + int i; + NBUF *nbuf; + + for (i=0; i<NBUF_MAXQ; ++i) + { + /* Initialize all the queues */ + queue_init(&nbuf_queue[i]); + } + + #ifdef CONFIG_DRIVER_NET_MCF54XX_DEBUG + printf("Creating %d net buffers of %d bytes\n",NBUF_MAX,NBUF_SZ); + #endif + + for (i=0; i<NBUF_MAX; ++i) + { + /* Allocate memory for the network buffer structure */ + nbuf = (NBUF *)malloc(sizeof(NBUF)); + if (!nbuf) + { + ASSERT(nbuf); + return 1; + } + + /* Allocate memory for the actual data */ + unaligned_buffers[i] = (ADDRESS)malloc(NBUF_SZ + 16); + nbuf->data = (uint8_t *)((uint32_t)(unaligned_buffers[i] + 15) & 0xFFFFFFF0); + if (!nbuf->data) + { + ASSERT(nbuf->data); + return 1; + } + + /* Initialize the network buffer */ + nbuf->offset = 0; + nbuf->length = 0; + + /* Add the network buffer to the free list */ + queue_add(&nbuf_queue[NBUF_FREE], (QNODE *)nbuf); + } + + #ifdef CONFIG_DRIVER_NET_MCF54XX_DEBUG + printf("NBUF allocation complete\n"); + nbuf_debug_dump(); + #endif + + return 0; +} +/** + * Return all the allocated memory to the heap + */ +void +nbuf_flush(void) +{ + NBUF *nbuf; + int i, level = asm_set_ipl(7); + int n = 0; + + for (i=0; i<NBUF_MAX; ++i) + free((uint8_t*)unaligned_buffers[i]); + + for (i=0; i<NBUF_MAXQ; ++i) + { + while ((nbuf = (NBUF *)queue_remove(&nbuf_queue[i])) != NULL) + { + free(nbuf); + ++n; + } + } + ASSERT(n == NBUF_MAX); + asm_set_ipl(level); +} +/** + * Allocate a network buffer from the free list + * + * Return Value: + * Pointer to a free network buffer + * NULL if none are available + */ +NBUF * +nbuf_alloc(void) +{ + NBUF *nbuf; + int level = asm_set_ipl(7); + + nbuf = (NBUF *)queue_remove(&nbuf_queue[NBUF_FREE]); + asm_set_ipl(level); + return nbuf; +} +/** + * Add the specified network buffer back to the free list + * + * Parameters: + * nbuf Buffer to add back to the free list + */ +void +nbuf_free(NBUF *nbuf) +{ + int level = asm_set_ipl(7); + + nbuf->offset = 0; + nbuf->length = NBUF_SZ; + queue_add(&nbuf_queue[NBUF_FREE],(QNODE *)nbuf); + + asm_set_ipl(level); +} +/** + * Remove a network buffer from the specified queue + * + * Parameters: + * q The index that identifies the queue to pull the buffer from + */ +NBUF * +nbuf_remove(int q) +{ + NBUF *nbuf; + int level = asm_set_ipl(7); + + nbuf = (NBUF *)queue_remove(&nbuf_queue[q]); + asm_set_ipl(level); + return nbuf; +} +/** + * Add a network buffer to the specified queue + * + * Parameters: + * q The index that identifies the queue to add the buffer to + */ +void +nbuf_add(int q, NBUF *nbuf) +{ + int level = asm_set_ipl(7); + queue_add(&nbuf_queue[q],(QNODE *)nbuf); + asm_set_ipl(level); +} +/** + * Put all the network buffers back into the free list + */ +void +nbuf_reset(void) +{ + NBUF *nbuf; + int i, level = asm_set_ipl(7); + + for (i=1; i<NBUF_MAXQ; ++i) + { + while ((nbuf = nbuf_remove(i)) != NULL) + nbuf_free(nbuf); + } + asm_set_ipl(level); +} +/** + * Display all the nbuf queues + */ +void +nbuf_debug_dump(void) +{ +#ifdef CONFIG_DRIVER_NET_MCF54XX_DEBUG + NBUF *nbuf; + int i, j, level; + + level = asm_set_ipl(7); + + for (i=0; i<NBUF_MAXQ; ++i) + { + printf("\n\nQueue #%d\n\n",i); + printf("\tBuffer Location\tOffset\tLength\n"); + printf("--------------------------------------\n"); + j = 0; + nbuf = (NBUF *)queue_peek(&nbuf_queue[i]); + while (nbuf != NULL) + { + printf("%d\t 0x%08x\t0x%04x\t0x%04x\n",j++,nbuf->data, + nbuf->offset, + nbuf->length); + nbuf = (NBUF *)nbuf->node.next; + } + } + + asm_set_ipl(level); +#endif +} |