116 lines
2.7 KiB
C
116 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Handle mapping of the NOR flash on implementa A7 boards
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*
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* Copyright 2002 SYSGO Real-Time Solutions GmbH
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <asm/io.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/partitions.h>
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#define WINDOW_ADDR0 0x00000000 /* physical properties of flash */
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#define WINDOW_SIZE0 0x00800000
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#define WINDOW_ADDR1 0x10000000 /* physical properties of flash */
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#define WINDOW_SIZE1 0x00800000
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#define NUM_FLASHBANKS 2
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#define BUSWIDTH 4
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#define MSG_PREFIX "impA7:" /* prefix for our printk()'s */
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#define MTDID "impa7-%d" /* for mtdparts= partitioning */
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static struct mtd_info *impa7_mtd[NUM_FLASHBANKS];
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static const char * const rom_probe_types[] = { "jedec_probe", NULL };
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static struct map_info impa7_map[NUM_FLASHBANKS] = {
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{
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.name = "impA7 NOR Flash Bank #0",
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.size = WINDOW_SIZE0,
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.bankwidth = BUSWIDTH,
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},
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{
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.name = "impA7 NOR Flash Bank #1",
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.size = WINDOW_SIZE1,
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.bankwidth = BUSWIDTH,
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},
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};
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/*
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* MTD partitioning stuff
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*/
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static const struct mtd_partition partitions[] =
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{
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{
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.name = "FileSystem",
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.size = 0x800000,
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.offset = 0x00000000
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},
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};
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static int __init init_impa7(void)
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{
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const char * const *type;
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int i;
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static struct { u_long addr; u_long size; } pt[NUM_FLASHBANKS] = {
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{ WINDOW_ADDR0, WINDOW_SIZE0 },
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{ WINDOW_ADDR1, WINDOW_SIZE1 },
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};
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int devicesfound = 0;
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for(i=0; i<NUM_FLASHBANKS; i++)
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{
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printk(KERN_NOTICE MSG_PREFIX "probing 0x%08lx at 0x%08lx\n",
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pt[i].size, pt[i].addr);
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impa7_map[i].phys = pt[i].addr;
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impa7_map[i].virt = ioremap(pt[i].addr, pt[i].size);
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if (!impa7_map[i].virt) {
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printk(MSG_PREFIX "failed to ioremap\n");
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return -EIO;
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}
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simple_map_init(&impa7_map[i]);
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impa7_mtd[i] = NULL;
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type = rom_probe_types;
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for(; !impa7_mtd[i] && *type; type++) {
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impa7_mtd[i] = do_map_probe(*type, &impa7_map[i]);
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}
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if (impa7_mtd[i]) {
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impa7_mtd[i]->owner = THIS_MODULE;
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devicesfound++;
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mtd_device_register(impa7_mtd[i], partitions,
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ARRAY_SIZE(partitions));
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} else {
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iounmap((void __iomem *)impa7_map[i].virt);
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}
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}
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return devicesfound == 0 ? -ENXIO : 0;
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}
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static void __exit cleanup_impa7(void)
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{
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int i;
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for (i=0; i<NUM_FLASHBANKS; i++) {
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if (impa7_mtd[i]) {
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mtd_device_unregister(impa7_mtd[i]);
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map_destroy(impa7_mtd[i]);
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iounmap((void __iomem *)impa7_map[i].virt);
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impa7_map[i].virt = NULL;
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}
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}
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}
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module_init(init_impa7);
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module_exit(cleanup_impa7);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Pavel Bartusek <pba@sysgo.de>");
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MODULE_DESCRIPTION("MTD map driver for implementa impA7");
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