LXR linux/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
  27static struct mtd_info *impa7_mtd[NUM_FLASHBANKS];
  28
  29static const char * const rom_probe_types[] = { "jedec_probe", NULL };
  30
  31static 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 */
  47static const struct mtd_partition partitions[] =
  48{
  49        {
  50                .name = "FileSystem",
  51                .size = 0x800000,
  52                .offset = 0x00000000
  53        },
  54};
  55
  56static 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
  97static 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
 110module_init(init_impa7);
 111module_exit(cleanup_impa7);
 112
 113MODULE_LICENSE("GPL");
 114MODULE_AUTHOR("Pavel Bartusek <pba@sysgo.de>");
 115MODULE_DESCRIPTION("MTD map driver for implementa impA7");
 116