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 1.12 2005/11/07 11:14:28 gleixner 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 static int probe = 0;           /* Don't autoprobe */
  30 static unsigned size = 0x1000000; /* 16 MiB the whole ISA address space */
  31 static unsigned width = 8;      /* Default to 8 bits wide */
  32 static char *flashtype = "cfi_probe";
  33
  34 module_param(probe, int, 0);
  35 MODULE_PARM_DESC(probe, "Probe for a BIOS mapping");
  36 module_param(size, int, 0);
  37 MODULE_PARM_DESC(size, "Size of the flash mapping");
  38 module_param(width, int, 0);
  39 MODULE_PARM_DESC(width, "Data width of the flash mapping (8/16)");
  40 module_param(flashtype, charp, 0);
  41 MODULE_PARM_DESC(flashtype, "Type of MTD probe to do");
  42
  43 static struct resource docmem = {
  44         .flags = IORESOURCE_MEM,
  45         .name  = "NatSemi SCx200 DOCCS Flash",
  46 };
  47
  48 static struct mtd_info *mymtd;
  49
  50 #ifdef CONFIG_MTD_PARTITIONS
  51 static struct mtd_partition partition_info[] = {
  52         {
  53                 .name   = "DOCCS Boot kernel",
  54                 .offset = 0,
  55                 .size   = 0xc0000
  56         },
  57         {
  58                 .name   = "DOCCS Low BIOS",
  59                 .offset = 0xc0000,
  60                 .size   = 0x40000
  61         },
  62         {
  63                 .name   = "DOCCS File system",
  64                 .offset = 0x100000,
  65                 .size   = ~0    /* calculate from flash size */
  66         },
  67         {
  68                 .name   = "DOCCS High BIOS",
  69                 .offset = ~0,   /* calculate from flash size */
  70                 .size   = 0x80000
  71         },
  72 };
  73 #define NUM_PARTITIONS ARRAY_SIZE(partition_info)
  74 #endif
  75
  76
  77 static struct map_info scx200_docflash_map = {
  78         .name      = "NatSemi SCx200 DOCCS Flash",
  79 };
  80
  81 static int __init init_scx200_docflash(void)
  82 {
  83         unsigned u;
  84         unsigned base;
  85         unsigned ctrl;
  86         unsigned pmr;
  87         struct pci_dev *bridge;
  88
  89         printk(KERN_DEBUG NAME ": NatSemi SCx200 DOCCS Flash Driver\n");
  90
  91         if ((bridge = pci_find_device(PCI_VENDOR_ID_NS,
  92                                       PCI_DEVICE_ID_NS_SCx200_BRIDGE,
  93                                       NULL)) == NULL)
  94                 return -ENODEV;
  95
  96         /* check that we have found the configuration block */
  97         if (!scx200_cb_present())
  98                 return -ENODEV;
  99
 100         if (probe) {
 101                 /* Try to use the present flash mapping if any */
 102                 pci_read_config_dword(bridge, SCx200_DOCCS_BASE, &base);
 103                 pci_read_config_dword(bridge, SCx200_DOCCS_CTRL, &ctrl);
 104                 pmr = inl(scx200_cb_base + SCx200_PMR);
 105
 106                 if (base == 0
 107                     || (ctrl & 0x07000000) != 0x07000000
 108                     || (ctrl & 0x0007ffff) == 0)
 109                         return -ENODEV;
 110
 111                 size = ((ctrl&0x1fff)<<13) + (1<<13);
 112
 113                 for (u = size; u > 1; u >>= 1)
 114                         ;
 115                 if (u != 1)
 116                         return -ENODEV;
 117
 118                 if (pmr & (1<<6))
 119                         width = 16;
 120                 else
 121                         width = 8;
 122
 123                 docmem.start = base;
 124                 docmem.end = base + size;
 125
 126                 if (request_resource(&iomem_resource, &docmem)) {
 127                         printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");
 128                         return -ENOMEM;
 129                 }
 130         } else {
 131                 for (u = size; u > 1; u >>= 1)
 132                         ;
 133                 if (u != 1) {
 134                         printk(KERN_ERR NAME ": invalid size for flash mapping\n");
 135                         return -EINVAL;
 136                 }
 137
 138                 if (width != 8 && width != 16) {
 139                         printk(KERN_ERR NAME ": invalid bus width for flash mapping\n");
 140                         return -EINVAL;
 141                 }
 142
 143                 if (allocate_resource(&iomem_resource, &docmem,
 144                                       size,
 145                                       0xc0000000, 0xffffffff,
 146                                       size, NULL, NULL)) {
 147                         printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");
 148                         return -ENOMEM;
 149                 }
 150
 151                 ctrl = 0x07000000 | ((size-1) >> 13);
 152
 153                 printk(KERN_INFO "DOCCS BASE=0x%08lx, CTRL=0x%08lx\n", (long)docmem.start, (long)ctrl);
 154
 155                 pci_write_config_dword(bridge, SCx200_DOCCS_BASE, docmem.start);
 156                 pci_write_config_dword(bridge, SCx200_DOCCS_CTRL, ctrl);
 157                 pmr = inl(scx200_cb_base + SCx200_PMR);
 158
 159                 if (width == 8) {
 160                         pmr &= ~(1<<6);
 161                 } else {
 162                         pmr |= (1<<6);
 163                 }
 164                 outl(pmr, scx200_cb_base + SCx200_PMR);
 165         }
 166
 167         printk(KERN_INFO NAME ": DOCCS mapped at 0x%lx-0x%lx, width %d\n",
 168                docmem.start, docmem.end, width);
 169
 170         scx200_docflash_map.size = size;
 171         if (width == 8)
 172                 scx200_docflash_map.bankwidth = 1;
 173         else
 174                 scx200_docflash_map.bankwidth = 2;
 175
 176         simple_map_init(&scx200_docflash_map);
 177
 178         scx200_docflash_map.phys = docmem.start;
 179         scx200_docflash_map.virt = ioremap(docmem.start, scx200_docflash_map.size);
 180         if (!scx200_docflash_map.virt) {
 181                 printk(KERN_ERR NAME ": failed to ioremap the flash\n");
 182                 release_resource(&docmem);
 183                 return -EIO;
 184         }
 185
 186         mymtd = do_map_probe(flashtype, &scx200_docflash_map);
 187         if (!mymtd) {
 188                 printk(KERN_ERR NAME ": unable to detect flash\n");
 189                 iounmap(scx200_docflash_map.virt);
 190                 release_resource(&docmem);
 191                 return -ENXIO;
 192         }
 193
 194         if (size < mymtd->size)
 195                 printk(KERN_WARNING NAME ": warning, flash mapping is smaller than flash size\n");
 196
 197         mymtd->owner = THIS_MODULE;
 198
 199 #ifdef CONFIG_MTD_PARTITIONS
 200         partition_info[3].offset = mymtd->size-partition_info[3].size;
 201         partition_info[2].size = partition_info[3].offset-partition_info[2].offset;
 202         add_mtd_partitions(mymtd, partition_info, NUM_PARTITIONS);
 203 #else
 204         add_mtd_device(mymtd);
 205 #endif
 206         return 0;
 207 }
 208
 209 static void __exit cleanup_scx200_docflash(void)
 210 {
 211         if (mymtd) {
 212 #ifdef CONFIG_MTD_PARTITIONS
 213                 del_mtd_partitions(mymtd);
 214 #else
 215                 del_mtd_device(mymtd);
 216 #endif
 217                 map_destroy(mymtd);
 218         }
 219         if (scx200_docflash_map.virt) {
 220                 iounmap(scx200_docflash_map.virt);
 221                 release_resource(&docmem);
 222         }
 223 }
 224
 225 module_init(init_scx200_docflash);
 226 module_exit(cleanup_scx200_docflash);
 227
 228 /*
 229     Local variables:
 230         compile-command: "make -k -C ../../.. SUBDIRS=drivers/mtd/maps modules"
 231         c-basic-offset: 8
 232     End:
 233 */