arch/powerpc/sysdev/bestcomm/ata.c

   1 /*
   2  * Bestcomm ATA task driver
   3  *
   4  *
   5  * Patterned after bestcomm/fec.c by Dale Farnsworth <dfarnsworth@mvista.com>
   6  *                                   2003-2004 (c) MontaVista, Software, Inc.
   7  *
   8  * Copyright (C) 2006-2007 Sylvain Munaut <tnt@246tNt.com>
   9  * Copyright (C) 2006      Freescale - John Rigby
  10  *
  11  * This file is licensed under the terms of the GNU General Public License
  12  * version 2. This program is licensed "as is" without any warranty of any
  13  * kind, whether express or implied.
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/types.h>
  19 #include <asm/io.h>
  20
  21 #include "bestcomm.h"
  22 #include "bestcomm_priv.h"
  23 #include "ata.h"
  24
  25
  26 /* ======================================================================== */
  27 /* Task image/var/inc                                                       */
  28 /* ======================================================================== */
  29
  30 /* ata task image */
  31 extern u32 bcom_ata_task[];
  32
  33 /* ata task vars that need to be set before enabling the task */
  34 struct bcom_ata_var {
  35         u32 enable;             /* (u16*) address of task's control register */
  36         u32 bd_base;            /* (struct bcom_bd*) beginning of ring buffer */
  37         u32 bd_last;            /* (struct bcom_bd*) end of ring buffer */
  38         u32 bd_start;           /* (struct bcom_bd*) current bd */
  39         u32 buffer_size;        /* size of receive buffer */
  40 };
  41
  42 /* ata task incs that need to be set before enabling the task */
  43 struct bcom_ata_inc {
  44         u16 pad0;
  45         s16 incr_bytes;
  46         u16 pad1;
  47         s16 incr_dst;
  48         u16 pad2;
  49         s16 incr_src;
  50 };
  51
  52
  53 /* ======================================================================== */
  54 /* Task support code                                                        */
  55 /* ======================================================================== */
  56
  57 struct bcom_task *
  58 bcom_ata_init(int queue_len, int maxbufsize)
  59 {
  60         struct bcom_task *tsk;
  61         struct bcom_ata_var *var;
  62         struct bcom_ata_inc *inc;
  63
  64         tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_ata_bd), 0);
  65         if (!tsk)
  66                 return NULL;
  67
  68         tsk->flags = BCOM_FLAGS_NONE;
  69
  70         bcom_ata_reset_bd(tsk);
  71
  72         var = (struct bcom_ata_var *) bcom_task_var(tsk->tasknum);
  73         inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);
  74
  75         if (bcom_load_image(tsk->tasknum, bcom_ata_task)) {
  76                 bcom_task_free(tsk);
  77                 return NULL;
  78         }
  79
  80         var->enable     = bcom_eng->regs_base +
  81                                 offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);
  82         var->bd_base    = tsk->bd_pa;
  83         var->bd_last    = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size);
  84         var->bd_start   = tsk->bd_pa;
  85         var->buffer_size = maxbufsize;
  86
  87         /* Configure some stuff */
  88         bcom_set_task_pragma(tsk->tasknum, BCOM_ATA_PRAGMA);
  89         bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);
  90
  91         out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ATA_RX], BCOM_IPR_ATA_RX);
  92         out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ATA_TX], BCOM_IPR_ATA_TX);
  93
  94         out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum); /* Clear ints */
  95
  96         return tsk;
  97 }
  98 EXPORT_SYMBOL_GPL(bcom_ata_init);
  99
 100 void bcom_ata_rx_prepare(struct bcom_task *tsk)
 101 {
 102         struct bcom_ata_inc *inc;
 103
 104         inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);
 105
 106         inc->incr_bytes = -(s16)sizeof(u32);
 107         inc->incr_src   = 0;
 108         inc->incr_dst   = sizeof(u32);
 109
 110         bcom_set_initiator(tsk->tasknum, BCOM_INITIATOR_ATA_RX);
 111 }
 112 EXPORT_SYMBOL_GPL(bcom_ata_rx_prepare);
 113
 114 void bcom_ata_tx_prepare(struct bcom_task *tsk)
 115 {
 116         struct bcom_ata_inc *inc;
 117
 118         inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);
 119
 120         inc->incr_bytes = -(s16)sizeof(u32);
 121         inc->incr_src   = sizeof(u32);
 122         inc->incr_dst   = 0;
 123
 124         bcom_set_initiator(tsk->tasknum, BCOM_INITIATOR_ATA_TX);
 125 }
 126 EXPORT_SYMBOL_GPL(bcom_ata_tx_prepare);
 127
 128 void bcom_ata_reset_bd(struct bcom_task *tsk)
 129 {
 130         struct bcom_ata_var *var;
 131
 132         /* Reset all BD */
 133         memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);
 134
 135         tsk->index = 0;
 136         tsk->outdex = 0;
 137
 138         var = (struct bcom_ata_var *) bcom_task_var(tsk->tasknum);
 139         var->bd_start = var->bd_base;
 140 }
 141 EXPORT_SYMBOL_GPL(bcom_ata_reset_bd);
 142
 143 void bcom_ata_release(struct bcom_task *tsk)
 144 {
 145         /* Nothing special for the ATA tasks */
 146         bcom_task_free(tsk);
 147 }
 148 EXPORT_SYMBOL_GPL(bcom_ata_release);
 149
 150
 151 MODULE_DESCRIPTION("BestComm ATA task driver");
 152 MODULE_AUTHOR("John Rigby");
 153 MODULE_LICENSE("GPL v2");
 154