158 строки
4.1 KiB
C
158 строки
4.1 KiB
C
/*
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* Bestcomm ATA task driver
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*
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*
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* Patterned after bestcomm/fec.c by Dale Farnsworth <dfarnsworth@mvista.com>
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* 2003-2004 (c) MontaVista, Software, Inc.
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*
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* Copyright (C) 2006-2007 Sylvain Munaut <tnt@246tNt.com>
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* Copyright (C) 2006 Freescale - John Rigby
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <asm/io.h>
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#include "bestcomm.h"
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#include "bestcomm_priv.h"
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#include "ata.h"
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/* ======================================================================== */
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/* Task image/var/inc */
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/* ======================================================================== */
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/* ata task image */
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extern u32 bcom_ata_task[];
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/* ata task vars that need to be set before enabling the task */
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struct bcom_ata_var {
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u32 enable; /* (u16*) address of task's control register */
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u32 bd_base; /* (struct bcom_bd*) beginning of ring buffer */
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u32 bd_last; /* (struct bcom_bd*) end of ring buffer */
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u32 bd_start; /* (struct bcom_bd*) current bd */
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u32 buffer_size; /* size of receive buffer */
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};
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/* ata task incs that need to be set before enabling the task */
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struct bcom_ata_inc {
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u16 pad0;
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s16 incr_bytes;
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u16 pad1;
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s16 incr_dst;
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u16 pad2;
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s16 incr_src;
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};
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/* ======================================================================== */
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/* Task support code */
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/* ======================================================================== */
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struct bcom_task *
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bcom_ata_init(int queue_len, int maxbufsize)
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{
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struct bcom_task *tsk;
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struct bcom_ata_var *var;
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struct bcom_ata_inc *inc;
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/* Prefetch breaks ATA DMA. Turn it off for ATA DMA */
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bcom_disable_prefetch();
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tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_ata_bd), 0);
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if (!tsk)
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return NULL;
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tsk->flags = BCOM_FLAGS_NONE;
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bcom_ata_reset_bd(tsk);
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var = (struct bcom_ata_var *) bcom_task_var(tsk->tasknum);
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inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);
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if (bcom_load_image(tsk->tasknum, bcom_ata_task)) {
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bcom_task_free(tsk);
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return NULL;
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}
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var->enable = bcom_eng->regs_base +
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offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);
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var->bd_base = tsk->bd_pa;
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var->bd_last = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size);
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var->bd_start = tsk->bd_pa;
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var->buffer_size = maxbufsize;
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/* Configure some stuff */
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bcom_set_task_pragma(tsk->tasknum, BCOM_ATA_PRAGMA);
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bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);
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out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ATA_RX], BCOM_IPR_ATA_RX);
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out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ATA_TX], BCOM_IPR_ATA_TX);
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out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum); /* Clear ints */
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return tsk;
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}
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EXPORT_SYMBOL_GPL(bcom_ata_init);
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void bcom_ata_rx_prepare(struct bcom_task *tsk)
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{
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struct bcom_ata_inc *inc;
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inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);
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inc->incr_bytes = -(s16)sizeof(u32);
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inc->incr_src = 0;
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inc->incr_dst = sizeof(u32);
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bcom_set_initiator(tsk->tasknum, BCOM_INITIATOR_ATA_RX);
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}
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EXPORT_SYMBOL_GPL(bcom_ata_rx_prepare);
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void bcom_ata_tx_prepare(struct bcom_task *tsk)
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{
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struct bcom_ata_inc *inc;
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inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);
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inc->incr_bytes = -(s16)sizeof(u32);
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inc->incr_src = sizeof(u32);
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inc->incr_dst = 0;
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bcom_set_initiator(tsk->tasknum, BCOM_INITIATOR_ATA_TX);
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}
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EXPORT_SYMBOL_GPL(bcom_ata_tx_prepare);
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void bcom_ata_reset_bd(struct bcom_task *tsk)
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{
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struct bcom_ata_var *var;
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/* Reset all BD */
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memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);
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tsk->index = 0;
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tsk->outdex = 0;
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var = (struct bcom_ata_var *) bcom_task_var(tsk->tasknum);
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var->bd_start = var->bd_base;
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}
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EXPORT_SYMBOL_GPL(bcom_ata_reset_bd);
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void bcom_ata_release(struct bcom_task *tsk)
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{
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/* Nothing special for the ATA tasks */
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bcom_task_free(tsk);
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}
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EXPORT_SYMBOL_GPL(bcom_ata_release);
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MODULE_DESCRIPTION("BestComm ATA task driver");
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MODULE_AUTHOR("John Rigby");
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MODULE_LICENSE("GPL v2");
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