drivers/mtd/maps/scx200_docflash.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* linux/drivers/mtd/maps/scx200_docflash.c
   3
   4    Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
   5
   6    National Semiconductor SCx200 flash mapped with DOCCS
   7 */
   8
   9 #include <linux/module.h>
  10 #include <linux/types.h>
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <asm/io.h>
  14 #include <linux/mtd/mtd.h>
  15 #include <linux/mtd/map.h>
  16 #include <linux/mtd/partitions.h>
  17
  18 #include <linux/pci.h>
  19 #include <linux/scx200.h>
  20
  21 #define NAME "scx200_docflash"
  22
  23 MODULE_AUTHOR("Christer Weinigel <wingel@hack.org>");
  24 MODULE_DESCRIPTION("NatSemi SCx200 DOCCS Flash Driver");
  25 MODULE_LICENSE("GPL");
  26
  27 static int probe = 0;           /* Don't autoprobe */
  28 static unsigned size = 0x1000000; /* 16 MiB the whole ISA address space */
  29 static unsigned width = 8;      /* Default to 8 bits wide */
  30 static char *flashtype = "cfi_probe";
  31
  32 module_param(probe, int, 0);
  33 MODULE_PARM_DESC(probe, "Probe for a BIOS mapping");
  34 module_param(size, int, 0);
  35 MODULE_PARM_DESC(size, "Size of the flash mapping");
  36 module_param(width, int, 0);
  37 MODULE_PARM_DESC(width, "Data width of the flash mapping (8/16)");
  38 module_param(flashtype, charp, 0);
  39 MODULE_PARM_DESC(flashtype, "Type of MTD probe to do");
  40
  41 static struct resource docmem = {
  42         .flags = IORESOURCE_MEM,
  43         .name  = "NatSemi SCx200 DOCCS Flash",
  44 };
  45
  46 static struct mtd_info *mymtd;
  47
  48 static struct mtd_partition partition_info[] = {
  49         {
  50                 .name   = "DOCCS Boot kernel",
  51                 .offset = 0,
  52                 .size   = 0xc0000
  53         },
  54         {
  55                 .name   = "DOCCS Low BIOS",
  56                 .offset = 0xc0000,
  57                 .size   = 0x40000
  58         },
  59         {
  60                 .name   = "DOCCS File system",
  61                 .offset = 0x100000,
  62                 .size   = ~0    /* calculate from flash size */
  63         },
  64         {
  65                 .name   = "DOCCS High BIOS",
  66                 .offset = ~0,   /* calculate from flash size */
  67                 .size   = 0x80000
  68         },
  69 };
  70 #define NUM_PARTITIONS ARRAY_SIZE(partition_info)
  71
  72 static struct map_info scx200_docflash_map = {
  73         .name      = "NatSemi SCx200 DOCCS Flash",
  74 };
  75
  76 static int __init init_scx200_docflash(void)
  77 {
  78         unsigned u;
  79         unsigned base;
  80         unsigned ctrl;
  81         unsigned pmr;
  82         struct pci_dev *bridge;
  83
  84         printk(KERN_DEBUG NAME ": NatSemi SCx200 DOCCS Flash Driver\n");
  85
  86         if ((bridge = pci_get_device(PCI_VENDOR_ID_NS,
  87                                       PCI_DEVICE_ID_NS_SCx200_BRIDGE,
  88                                       NULL)) == NULL)
  89                 return -ENODEV;
  90
  91         /* check that we have found the configuration block */
  92         if (!scx200_cb_present()) {
  93                 pci_dev_put(bridge);
  94                 return -ENODEV;
  95         }
  96
  97         if (probe) {
  98                 /* Try to use the present flash mapping if any */
  99                 pci_read_config_dword(bridge, SCx200_DOCCS_BASE, &base);
 100                 pci_read_config_dword(bridge, SCx200_DOCCS_CTRL, &ctrl);
 101                 pci_dev_put(bridge);
 102
 103                 pmr = inl(scx200_cb_base + SCx200_PMR);
 104
 105                 if (base == 0
 106                     || (ctrl & 0x07000000) != 0x07000000
 107                     || (ctrl & 0x0007ffff) == 0)
 108                         return -ENODEV;
 109
 110                 size = ((ctrl&0x1fff)<<13) + (1<<13);
 111
 112                 for (u = size; u > 1; u >>= 1)
 113                         ;
 114                 if (u != 1)
 115                         return -ENODEV;
 116
 117                 if (pmr & (1<<6))
 118                         width = 16;
 119                 else
 120                         width = 8;
 121
 122                 docmem.start = base;
 123                 docmem.end = base + size;
 124
 125                 if (request_resource(&iomem_resource, &docmem)) {
 126                         printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");
 127                         return -ENOMEM;
 128                 }
 129         } else {
 130                 pci_dev_put(bridge);
 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 %pR, width %d\n",
 168                &docmem, 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         partition_info[3].offset = mymtd->size-partition_info[3].size;
 200         partition_info[2].size = partition_info[3].offset-partition_info[2].offset;
 201         mtd_device_register(mymtd, partition_info, NUM_PARTITIONS);
 202
 203         return 0;
 204 }
 205
 206 static void __exit cleanup_scx200_docflash(void)
 207 {
 208         if (mymtd) {
 209                 mtd_device_unregister(mymtd);
 210                 map_destroy(mymtd);
 211         }
 212         if (scx200_docflash_map.virt) {
 213                 iounmap(scx200_docflash_map.virt);
 214                 release_resource(&docmem);
 215         }
 216 }
 217
 218 module_init(init_scx200_docflash);
 219 module_exit(cleanup_scx200_docflash);