drivers/mtd/maps/impa7.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Handle mapping of the NOR flash on implementa A7 boards
   4  *
   5  * Copyright 2002 SYSGO Real-Time Solutions GmbH
   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 #define WINDOW_ADDR0 0x00000000      /* physical properties of flash */
  18 #define WINDOW_SIZE0 0x00800000
  19 #define WINDOW_ADDR1 0x10000000      /* physical properties of flash */
  20 #define WINDOW_SIZE1 0x00800000
  21 #define NUM_FLASHBANKS 2
  22 #define BUSWIDTH     4
  23
  24 #define MSG_PREFIX "impA7:"   /* prefix for our printk()'s */
  25 #define MTDID      "impa7-%d"  /* for mtdparts= partitioning */
  26
  27 static struct mtd_info *impa7_mtd[NUM_FLASHBANKS];
  28
  29 static const char * const rom_probe_types[] = { "jedec_probe", NULL };
  30
  31 static struct map_info impa7_map[NUM_FLASHBANKS] = {
  32         {
  33                 .name = "impA7 NOR Flash Bank #0",
  34                 .size = WINDOW_SIZE0,
  35                 .bankwidth = BUSWIDTH,
  36         },
  37         {
  38                 .name = "impA7 NOR Flash Bank #1",
  39                 .size = WINDOW_SIZE1,
  40                 .bankwidth = BUSWIDTH,
  41         },
  42 };
  43
  44 /*
  45  * MTD partitioning stuff
  46  */
  47 static const struct mtd_partition partitions[] =
  48 {
  49         {
  50                 .name = "FileSystem",
  51                 .size = 0x800000,
  52                 .offset = 0x00000000
  53         },
  54 };
  55
  56 static int __init init_impa7(void)
  57 {
  58         const char * const *type;
  59         int i;
  60         static struct { u_long addr; u_long size; } pt[NUM_FLASHBANKS] = {
  61           { WINDOW_ADDR0, WINDOW_SIZE0 },
  62           { WINDOW_ADDR1, WINDOW_SIZE1 },
  63         };
  64         int devicesfound = 0;
  65
  66         for(i=0; i<NUM_FLASHBANKS; i++)
  67         {
  68                 printk(KERN_NOTICE MSG_PREFIX "probing 0x%08lx at 0x%08lx\n",
  69                        pt[i].size, pt[i].addr);
  70
  71                 impa7_map[i].phys = pt[i].addr;
  72                 impa7_map[i].virt = ioremap(pt[i].addr, pt[i].size);
  73                 if (!impa7_map[i].virt) {
  74                         printk(MSG_PREFIX "failed to ioremap\n");
  75                         return -EIO;
  76                 }
  77                 simple_map_init(&impa7_map[i]);
  78
  79                 impa7_mtd[i] = NULL;
  80                 type = rom_probe_types;
  81                 for(; !impa7_mtd[i] && *type; type++) {
  82                         impa7_mtd[i] = do_map_probe(*type, &impa7_map[i]);
  83                 }
  84
  85                 if (impa7_mtd[i]) {
  86                         impa7_mtd[i]->owner = THIS_MODULE;
  87                         devicesfound++;
  88                         mtd_device_register(impa7_mtd[i], partitions,
  89                                             ARRAY_SIZE(partitions));
  90                 } else {
  91                         iounmap((void __iomem *)impa7_map[i].virt);
  92                 }
  93         }
  94         return devicesfound == 0 ? -ENXIO : 0;
  95 }
  96
  97 static void __exit cleanup_impa7(void)
  98 {
  99         int i;
 100         for (i=0; i<NUM_FLASHBANKS; i++) {
 101                 if (impa7_mtd[i]) {
 102                         mtd_device_unregister(impa7_mtd[i]);
 103                         map_destroy(impa7_mtd[i]);
 104                         iounmap((void __iomem *)impa7_map[i].virt);
 105                         impa7_map[i].virt = NULL;
 106                 }
 107         }
 108 }
 109
 110 module_init(init_impa7);
 111 module_exit(cleanup_impa7);
 112
 113 MODULE_LICENSE("GPL");
 114 MODULE_AUTHOR("Pavel Bartusek <pba@sysgo.de>");
 115 MODULE_DESCRIPTION("MTD map driver for implementa impA7");