drivers/mtd/maps/scx200_docflash.c

   1 /* linux/drivers/mtd/maps/scx200_docflash.c
   2
   3    Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
   4
   5    $Id: scx200_docflash.c,v 1.5 2003/05/21 12:45:20 dwmw2 Exp $
   6
   7    National Semiconductor SCx200 flash mapped with DOCCS
   8 */
   9
  10 #include <linux/module.h>
  11 #include <linux/config.h>
  12 #include <linux/types.h>
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <asm/io.h>
  16 #include <linux/mtd/mtd.h>
  17 #include <linux/mtd/map.h>
  18 #include <linux/mtd/partitions.h>
  19
  20 #include <linux/pci.h>
  21 #include <linux/scx200.h>
  22
  23 #define NAME "scx200_docflash"
  24
  25 MODULE_AUTHOR("Christer Weinigel <wingel@hack.org>");
  26 MODULE_DESCRIPTION("NatSemi SCx200 DOCCS Flash Driver");
  27 MODULE_LICENSE("GPL");
  28
  29 /* Set this to one if you want to partition the flash */
  30 #define PARTITION 1
  31
  32 MODULE_PARM(probe, "i");
  33 MODULE_PARM_DESC(probe, "Probe for a BIOS mapping");
  34 MODULE_PARM(size, "i");
  35 MODULE_PARM_DESC(size, "Size of the flash mapping");
  36 MODULE_PARM(width, "i");
  37 MODULE_PARM_DESC(width, "Data width of the flash mapping (8/16)");
  38 MODULE_PARM(flashtype, "s");
  39 MODULE_PARM_DESC(flashtype, "Type of MTD probe to do");
  40
  41 static int probe = 0;           /* Don't autoprobe */
  42 static unsigned size = 0x1000000; /* 16 MiB the whole ISA address space */
  43 static unsigned width = 8;      /* Default to 8 bits wide */
  44 static char *flashtype = "cfi_probe";
  45
  46 static struct resource docmem = {
  47         .flags = IORESOURCE_MEM,
  48         .name  = "NatSemi SCx200 DOCCS Flash",
  49 };
  50
  51 static struct mtd_info *mymtd;
  52
  53 #if PARTITION
  54 static struct mtd_partition partition_info[] = {
  55         {
  56                 .name   = "DOCCS Boot kernel",
  57                 .offset = 0,
  58                 .size   = 0xc0000
  59         },
  60         {
  61                 .name   = "DOCCS Low BIOS",
  62                 .offset = 0xc0000,
  63                 .size   = 0x40000
  64         },
  65         {
  66                 .name   = "DOCCS File system",
  67                 .offset = 0x100000,
  68                 .size   = ~0    /* calculate from flash size */
  69         },
  70         {
  71                 .name   = "DOCCS High BIOS",
  72                 .offset = ~0,   /* calculate from flash size */
  73                 .size   = 0x80000
  74         },
  75 };
  76 #define NUM_PARTITIONS (sizeof(partition_info)/sizeof(partition_info[0]))
  77 #endif
  78
  79
  80 static struct map_info scx200_docflash_map = {
  81         .name      = "NatSemi SCx200 DOCCS Flash",
  82 };
  83
  84 int __init init_scx200_docflash(void)
  85 {
  86         unsigned u;
  87         unsigned base;
  88         unsigned ctrl;
  89         unsigned pmr;
  90         struct pci_dev *bridge;
  91
  92         printk(KERN_DEBUG NAME ": NatSemi SCx200 DOCCS Flash Driver\n");
  93
  94         if ((bridge = pci_find_device(PCI_VENDOR_ID_NS,
  95                                       PCI_DEVICE_ID_NS_SCx200_BRIDGE,
  96                                       NULL)) == NULL)
  97                 return -ENODEV;
  98
  99         if (!scx200_cb_probe(SCx200_CB_BASE)) {
 100                 printk(KERN_WARNING NAME ": no configuration block found\n");
 101                 return -ENODEV;
 102         }
 103
 104         if (probe) {
 105                 /* Try to use the present flash mapping if any */
 106                 pci_read_config_dword(bridge, SCx200_DOCCS_BASE, &base);
 107                 pci_read_config_dword(bridge, SCx200_DOCCS_CTRL, &ctrl);
 108                 pmr = inl(SCx200_CB_BASE + SCx200_PMR);
 109
 110                 if (base == 0
 111                     || (ctrl & 0x07000000) != 0x07000000
 112                     || (ctrl & 0x0007ffff) == 0)
 113                         return -ENODEV;
 114
 115                 size = ((ctrl&0x1fff)<<13) + (1<<13);
 116
 117                 for (u = size; u > 1; u >>= 1)
 118                         ;
 119                 if (u != 1)
 120                         return -ENODEV;
 121
 122                 if (pmr & (1<<6))
 123                         width = 16;
 124                 else
 125                         width = 8;
 126
 127                 docmem.start = base;
 128                 docmem.end = base + size;
 129
 130                 if (request_resource(&iomem_resource, &docmem)) {
 131                         printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");
 132                         return -ENOMEM;
 133                 }
 134         } else {
 135                 for (u = size; u > 1; u >>= 1)
 136                         ;
 137                 if (u != 1) {
 138                         printk(KERN_ERR NAME ": invalid size for flash mapping\n");
 139                         return -EINVAL;
 140                 }
 141
 142                 if (width != 8 && width != 16) {
 143                         printk(KERN_ERR NAME ": invalid bus width for flash mapping\n");
 144                         return -EINVAL;
 145                 }
 146
 147                 if (allocate_resource(&iomem_resource, &docmem,
 148                                       size,
 149                                       0xc0000000, 0xffffffff,
 150                                       size, NULL, NULL)) {
 151                         printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");
 152                         return -ENOMEM;
 153                 }
 154
 155                 ctrl = 0x07000000 | ((size-1) >> 13);
 156
 157                 printk(KERN_INFO "DOCCS BASE=0x%08lx, CTRL=0x%08lx\n", (long)docmem.start, (long)ctrl);
 158
 159                 pci_write_config_dword(bridge, SCx200_DOCCS_BASE, docmem.start);
 160                 pci_write_config_dword(bridge, SCx200_DOCCS_CTRL, ctrl);
 161                 pmr = inl(SCx200_CB_BASE + SCx200_PMR);
 162
 163                 if (width == 8) {
 164                         pmr &= ~(1<<6);
 165                 } else {
 166                         pmr |= (1<<6);
 167                 }
 168                 outl(pmr, SCx200_CB_BASE + SCx200_PMR);
 169         }
 170
 171         printk(KERN_INFO NAME ": DOCCS mapped at 0x%lx-0x%lx, width %d\n",
 172                docmem.start, docmem.end, width);
 173
 174         scx200_docflash_map.size = size;
 175         if (width == 8)
 176                 scx200_docflash_map.buswidth = 1;
 177         else
 178                 scx200_docflash_map.buswidth = 2;
 179
 180         simple_map_init(&scx200_docflash_map);
 181
 182         scx200_docflash_map.phys = docmem.start;
 183         scx200_docflash_map.virt = (unsigned long)ioremap(docmem.start, scx200_docflash_map.size);
 184         if (!scx200_docflash_map.virt) {
 185                 printk(KERN_ERR NAME ": failed to ioremap the flash\n");
 186                 release_resource(&docmem);
 187                 return -EIO;
 188         }
 189
 190         mymtd = do_map_probe(flashtype, &scx200_docflash_map);
 191         if (!mymtd) {
 192                 printk(KERN_ERR NAME ": unable to detect flash\n");
 193                 iounmap((void *)scx200_docflash_map.virt);
 194                 release_resource(&docmem);
 195                 return -ENXIO;
 196         }
 197
 198         if (size < mymtd->size)
 199                 printk(KERN_WARNING NAME ": warning, flash mapping is smaller than flash size\n");
 200
 201         mymtd->owner = THIS_MODULE;
 202
 203 #if PARTITION
 204         partition_info[3].offset = mymtd->size-partition_info[3].size;
 205         partition_info[2].size = partition_info[3].offset-partition_info[2].offset;
 206         add_mtd_partitions(mymtd, partition_info, NUM_PARTITIONS);
 207 #else
 208         add_mtd_device(mymtd);
 209 #endif
 210         return 0;
 211 }
 212
 213 static void __exit cleanup_scx200_docflash(void)
 214 {
 215         if (mymtd) {
 216 #if PARTITION
 217                 del_mtd_partitions(mymtd);
 218 #else
 219                 del_mtd_device(mymtd);
 220 #endif
 221                 map_destroy(mymtd);
 222         }
 223         if (scx200_docflash_map.virt) {
 224                 iounmap((void *)scx200_docflash_map.virt);
 225                 release_resource(&docmem);
 226         }
 227 }
 228
 229 module_init(init_scx200_docflash);
 230 module_exit(cleanup_scx200_docflash);
 231
 232 /*
 233     Local variables:
 234         compile-command: "make -k -C ../../.. SUBDIRS=drivers/mtd/maps modules"
 235         c-basic-offset: 8
 236     End:
 237 */