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    National Semiconductor SCx200 flash mapped with DOCCS
   6 */
   7
   8 #include <linux/module.h>
   9 #include <linux/types.h>
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <asm/io.h>
  13 #include <linux/mtd/mtd.h>
  14 #include <linux/mtd/map.h>
  15 #include <linux/mtd/partitions.h>
  16
  17 #include <linux/pci.h>
  18 #include <linux/scx200.h>
  19
  20 #define NAME "scx200_docflash"
  21
  22 MODULE_AUTHOR("Christer Weinigel <wingel@hack.org>");
  23 MODULE_DESCRIPTION("NatSemi SCx200 DOCCS Flash Driver");
  24 MODULE_LICENSE("GPL");
  25
  26 static int probe = 0;           /* Don't autoprobe */
  27 static unsigned size = 0x1000000; /* 16 MiB the whole ISA address space */
  28 static unsigned width = 8;      /* Default to 8 bits wide */
  29 static char *flashtype = "cfi_probe";
  30
  31 module_param(probe, int, 0);
  32 MODULE_PARM_DESC(probe, "Probe for a BIOS mapping");
  33 module_param(size, int, 0);
  34 MODULE_PARM_DESC(size, "Size of the flash mapping");
  35 module_param(width, int, 0);
  36 MODULE_PARM_DESC(width, "Data width of the flash mapping (8/16)");
  37 module_param(flashtype, charp, 0);
  38 MODULE_PARM_DESC(flashtype, "Type of MTD probe to do");
  39
  40 static struct resource docmem = {
  41         .flags = IORESOURCE_MEM,
  42         .name  = "NatSemi SCx200 DOCCS Flash",
  43 };
  44
  45 static struct mtd_info *mymtd;
  46
  47 static struct mtd_partition partition_info[] = {
  48         {
  49                 .name   = "DOCCS Boot kernel",
  50                 .offset = 0,
  51                 .size   = 0xc0000
  52         },
  53         {
  54                 .name   = "DOCCS Low BIOS",
  55                 .offset = 0xc0000,
  56                 .size   = 0x40000
  57         },
  58         {
  59                 .name   = "DOCCS File system",
  60                 .offset = 0x100000,
  61                 .size   = ~0    /* calculate from flash size */
  62         },
  63         {
  64                 .name   = "DOCCS High BIOS",
  65                 .offset = ~0,   /* calculate from flash size */
  66                 .size   = 0x80000
  67         },
  68 };
  69 #define NUM_PARTITIONS ARRAY_SIZE(partition_info)
  70
  71 static struct map_info scx200_docflash_map = {
  72         .name      = "NatSemi SCx200 DOCCS Flash",
  73 };
  74
  75 static int __init init_scx200_docflash(void)
  76 {
  77         unsigned u;
  78         unsigned base;
  79         unsigned ctrl;
  80         unsigned pmr;
  81         struct pci_dev *bridge;
  82
  83         printk(KERN_DEBUG NAME ": NatSemi SCx200 DOCCS Flash Driver\n");
  84
  85         if ((bridge = pci_get_device(PCI_VENDOR_ID_NS,
  86                                       PCI_DEVICE_ID_NS_SCx200_BRIDGE,
  87                                       NULL)) == NULL)
  88                 return -ENODEV;
  89
  90         /* check that we have found the configuration block */
  91         if (!scx200_cb_present()) {
  92                 pci_dev_put(bridge);
  93                 return -ENODEV;
  94         }
  95
  96         if (probe) {
  97                 /* Try to use the present flash mapping if any */
  98                 pci_read_config_dword(bridge, SCx200_DOCCS_BASE, &base);
  99                 pci_read_config_dword(bridge, SCx200_DOCCS_CTRL, &ctrl);
 100                 pci_dev_put(bridge);
 101
 102                 pmr = inl(scx200_cb_base + SCx200_PMR);
 103
 104                 if (base == 0
 105                     || (ctrl & 0x07000000) != 0x07000000
 106                     || (ctrl & 0x0007ffff) == 0)
 107                         return -ENODEV;
 108
 109                 size = ((ctrl&0x1fff)<<13) + (1<<13);
 110
 111                 for (u = size; u > 1; u >>= 1)
 112                         ;
 113                 if (u != 1)
 114                         return -ENODEV;
 115
 116                 if (pmr & (1<<6))
 117                         width = 16;
 118                 else
 119                         width = 8;
 120
 121                 docmem.start = base;
 122                 docmem.end = base + size;
 123
 124                 if (request_resource(&iomem_resource, &docmem)) {
 125                         printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");
 126                         return -ENOMEM;
 127                 }
 128         } else {
 129                 pci_dev_put(bridge);
 130                 for (u = size; u > 1; u >>= 1)
 131                         ;
 132                 if (u != 1) {
 133                         printk(KERN_ERR NAME ": invalid size for flash mapping\n");
 134                         return -EINVAL;
 135                 }
 136
 137                 if (width != 8 && width != 16) {
 138                         printk(KERN_ERR NAME ": invalid bus width for flash mapping\n");
 139                         return -EINVAL;
 140                 }
 141
 142                 if (allocate_resource(&iomem_resource, &docmem,
 143                                       size,
 144                                       0xc0000000, 0xffffffff,
 145                                       size, NULL, NULL)) {
 146                         printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");
 147                         return -ENOMEM;
 148                 }
 149
 150                 ctrl = 0x07000000 | ((size-1) >> 13);
 151
 152                 printk(KERN_INFO "DOCCS BASE=0x%08lx, CTRL=0x%08lx\n", (long)docmem.start, (long)ctrl);
 153
 154                 pci_write_config_dword(bridge, SCx200_DOCCS_BASE, docmem.start);
 155                 pci_write_config_dword(bridge, SCx200_DOCCS_CTRL, ctrl);
 156                 pmr = inl(scx200_cb_base + SCx200_PMR);
 157
 158                 if (width == 8) {
 159                         pmr &= ~(1<<6);
 160                 } else {
 161                         pmr |= (1<<6);
 162                 }
 163                 outl(pmr, scx200_cb_base + SCx200_PMR);
 164         }
 165
 166         printk(KERN_INFO NAME ": DOCCS mapped at %pR, width %d\n",
 167                &docmem, width);
 168
 169         scx200_docflash_map.size = size;
 170         if (width == 8)
 171                 scx200_docflash_map.bankwidth = 1;
 172         else
 173                 scx200_docflash_map.bankwidth = 2;
 174
 175         simple_map_init(&scx200_docflash_map);
 176
 177         scx200_docflash_map.phys = docmem.start;
 178         scx200_docflash_map.virt = ioremap(docmem.start, scx200_docflash_map.size);
 179         if (!scx200_docflash_map.virt) {
 180                 printk(KERN_ERR NAME ": failed to ioremap the flash\n");
 181                 release_resource(&docmem);
 182                 return -EIO;
 183         }
 184
 185         mymtd = do_map_probe(flashtype, &scx200_docflash_map);
 186         if (!mymtd) {
 187                 printk(KERN_ERR NAME ": unable to detect flash\n");
 188                 iounmap(scx200_docflash_map.virt);
 189                 release_resource(&docmem);
 190                 return -ENXIO;
 191         }
 192
 193         if (size < mymtd->size)
 194                 printk(KERN_WARNING NAME ": warning, flash mapping is smaller than flash size\n");
 195
 196         mymtd->owner = THIS_MODULE;
 197
 198         partition_info[3].offset = mymtd->size-partition_info[3].size;
 199         partition_info[2].size = partition_info[3].offset-partition_info[2].offset;
 200         mtd_device_register(mymtd, partition_info, NUM_PARTITIONS);
 201
 202         return 0;
 203 }
 204
 205 static void __exit cleanup_scx200_docflash(void)
 206 {
 207         if (mymtd) {
 208                 mtd_device_unregister(mymtd);
 209                 map_destroy(mymtd);
 210         }
 211         if (scx200_docflash_map.virt) {
 212                 iounmap(scx200_docflash_map.virt);
 213                 release_resource(&docmem);
 214         }
 215 }
 216
 217 module_init(init_scx200_docflash);
 218 module_exit(cleanup_scx200_docflash);
 219
 220 /*
 221     Local variables:
 222         compile-command: "make -k -C ../../.. SUBDIRS=drivers/mtd/maps modules"
 223         c-basic-offset: 8
 224     End:
 225 */