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157 lines
4.2 KiB
157 lines
4.2 KiB
/* |
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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 <linux/fsl/bestcomm/bestcomm.h> |
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#include <linux/fsl/bestcomm/bestcomm_priv.h> |
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#include <linux/fsl/bestcomm/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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