rom/hidds/ata_pci/interface_dma.c

   1 /*
   2     Copyright © 2004-2013, The AROS Development Team. All rights reserved
   3     $Id$
   4
   5     Desc: Generic PCI-DMA ATA controller driver
   6     Lang: English
   7 */
   8
   9 #include <aros/debug.h>
  10 #include <devices/scsidisk.h>
  11 #include <exec/exec.h>
  12 #include <proto/exec.h>
  13
  14 #include "interface_dma.h"
  15
  16 /*
  17  * Prepare PRD entries for sectors transfer. This function assumes that no one
  18  * else will even touch PRD. It should be however truth, as for given bus all
  19  * ATA accesses are protected with a semaphore.
  20  */
  21 static LONG dma_Setup(APTR addr, ULONG len, BOOL read, struct PRDEntry* array)
  22 {
  23     ULONG tmp = 0, rem = 0;
  24     ULONG flg = read ? DMA_ReadFromRAM : 0;
  25     IPTR phy_mem;
  26     LONG items = 0;
  27
  28     D(bug("[PCI-ATA] dma_Setup(addr %p, len %d, PRDEntry  @ %p for %s)\n", addr, len, array, read ? "READ" : "WRITE"));
  29
  30     /*
  31      * in future you may have to put this in prd construction procedure
  32      */
  33     while (0 < len)
  34     {
  35         tmp = len;
  36         phy_mem = (IPTR)CachePreDMA(addr, &tmp, flg);
  37
  38         D(bug("[PCI-ATA] dma_Setup: Translating V:%p > P:%p (%ld bytes)\n", addr, phy_mem, tmp));
  39         /*
  40          * update all addresses for the next call
  41          */
  42         addr = &((UBYTE*)addr)[tmp];
  43         len -= tmp;
  44         flg |= DMA_Continue;
  45
  46         /*
  47          * check if we're crossing the magic 64k boundary:
  48          */
  49         while (0 < tmp)
  50         {
  51             /*
  52              * politely say what sucks
  53              */
  54             if (phy_mem > 0xffffffffull)
  55             {
  56                 D(bug("[PCI-ATA] dma_Setup: ERROR: ATA DMA POINTERS BEYOND MAXIMUM ALLOWED ADDRESS!\n"));
  57                 return 0;
  58             }
  59             if (items > PRD_MAX)
  60             {
  61                 D(bug("[PCI-ATA] dma_Setup: ERROR: ATA DMA PRD TABLE SIZE TOO LARGE\n"));
  62                 return 0;
  63             }
  64
  65             /*
  66              * calculate remainder and see if it is larger of the current memory block.
  67              * if smaller, adjust its size.
  68              */
  69             rem = 0x10000 - (phy_mem & 0xffff);
  70             if (rem > tmp)
  71                 rem = tmp;
  72             /*
  73              * update PRD with address and remainder
  74              */
  75             D(bug("[PCI-ATA] dma_Setup: Inserting into PRD Table: %p / %d @ %p\n", phy_mem, rem, array));
  76             array->prde_Address = AROS_LONG2LE(phy_mem);
  77             array->prde_Length  = AROS_LONG2LE((rem & 0xffff));
  78             ++array;
  79             ++items;
  80
  81             /*
  82              * update locals ;-)
  83              */
  84             phy_mem += rem;
  85             tmp -= rem;
  86         }
  87     }
  88
  89     if (items > 0)
  90     {
  91         --array;
  92         array->prde_Length |= AROS_LONG2LE(PRDE_EOT);
  93     }
  94     D(bug("[PCI-ATA] dma_Setup: PRD Table set - %u items in total.\n", items));
  95
  96     /*
  97      * PRD table all set.
  98      */
  99     return items;
 100 }
 101
 102 BOOL dma_SetupPRDSize(struct dma_data *unit, APTR buffer, IPTR size, BOOL read)
 103 {
 104     LONG items = 0;
 105     IPTR prd_phys;
 106     ULONG length;
 107
 108     items = dma_Setup(buffer, size, read, unit->ab_PRD);
 109
 110     if (0 == items)
 111         return FALSE;
 112
 113     length = items * sizeof(struct PRDEntry);
 114
 115     prd_phys = (IPTR)CachePreDMA(unit->ab_PRD, &length, DMA_ReadFromRAM);
 116
 117     outl(prd_phys, dma_PRD + unit->au_DMAPort);
 118     outb(read ? DMA_WRITE : DMA_READ, dma_Command + unit->au_DMAPort); /* inverse logic */
 119
 120     return TRUE;
 121 }
 122
 123 void dma_Cleanup(struct dma_data *unit, APTR addr, IPTR len, BOOL read)
 124 {
 125     ULONG tmp, flg;
 126     port_t port = dma_Command + unit->au_DMAPort;
 127
 128     /* Stop DMA engine */
 129     outb(inb(port) & ~DMA_START, port);
 130
 131     flg = read ? DMA_ReadFromRAM : 0;
 132     while (len > 0)
 133     {
 134         tmp = len;
 135         CachePostDMA(addr, &tmp, flg);
 136         addr = &((UBYTE*)addr)[tmp];
 137         len -= tmp;
 138         flg |= DMA_Continue;
 139     }
 140 }
 141
 142 VOID dma_StartDMA(struct dma_data *unit)
 143 {
 144     port_t port = dma_Command + unit->au_DMAPort;
 145
 146     outb(inb(port) | DMA_START, port);
 147 }
 148
 149 ULONG dma_CheckErr(struct dma_data *unit)
 150 {
 151     UBYTE stat = inb(dma_Status + unit->au_DMAPort);
 152
 153     return (stat & DMAF_Error) ? HFERR_DMA : 0;
 154 }
 155
 156 const APTR dma_FuncTable[]=
 157 {
 158     dma_SetupPRDSize,
 159     dma_StartDMA,
 160     dma_Cleanup,
 161     dma_CheckErr,
 162     (APTR)-1
 163 };