1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Handle mapping of the NOR flash on implementa A7 boards
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright 2002 SYSGO Real-Time Solutions GmbH
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/module.h>
9*4882a593Smuzhiyun #include <linux/types.h>
10*4882a593Smuzhiyun #include <linux/kernel.h>
11*4882a593Smuzhiyun #include <linux/init.h>
12*4882a593Smuzhiyun #include <asm/io.h>
13*4882a593Smuzhiyun #include <linux/mtd/mtd.h>
14*4882a593Smuzhiyun #include <linux/mtd/map.h>
15*4882a593Smuzhiyun #include <linux/mtd/partitions.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun #define WINDOW_ADDR0 0x00000000 /* physical properties of flash */
18*4882a593Smuzhiyun #define WINDOW_SIZE0 0x00800000
19*4882a593Smuzhiyun #define WINDOW_ADDR1 0x10000000 /* physical properties of flash */
20*4882a593Smuzhiyun #define WINDOW_SIZE1 0x00800000
21*4882a593Smuzhiyun #define NUM_FLASHBANKS 2
22*4882a593Smuzhiyun #define BUSWIDTH 4
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun #define MSG_PREFIX "impA7:" /* prefix for our printk()'s */
25*4882a593Smuzhiyun #define MTDID "impa7-%d" /* for mtdparts= partitioning */
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun static struct mtd_info *impa7_mtd[NUM_FLASHBANKS];
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun static const char * const rom_probe_types[] = { "jedec_probe", NULL };
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun static struct map_info impa7_map[NUM_FLASHBANKS] = {
32*4882a593Smuzhiyun {
33*4882a593Smuzhiyun .name = "impA7 NOR Flash Bank #0",
34*4882a593Smuzhiyun .size = WINDOW_SIZE0,
35*4882a593Smuzhiyun .bankwidth = BUSWIDTH,
36*4882a593Smuzhiyun },
37*4882a593Smuzhiyun {
38*4882a593Smuzhiyun .name = "impA7 NOR Flash Bank #1",
39*4882a593Smuzhiyun .size = WINDOW_SIZE1,
40*4882a593Smuzhiyun .bankwidth = BUSWIDTH,
41*4882a593Smuzhiyun },
42*4882a593Smuzhiyun };
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun /*
45*4882a593Smuzhiyun * MTD partitioning stuff
46*4882a593Smuzhiyun */
47*4882a593Smuzhiyun static const struct mtd_partition partitions[] =
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun {
50*4882a593Smuzhiyun .name = "FileSystem",
51*4882a593Smuzhiyun .size = 0x800000,
52*4882a593Smuzhiyun .offset = 0x00000000
53*4882a593Smuzhiyun },
54*4882a593Smuzhiyun };
55*4882a593Smuzhiyun
init_impa7(void)56*4882a593Smuzhiyun static int __init init_impa7(void)
57*4882a593Smuzhiyun {
58*4882a593Smuzhiyun const char * const *type;
59*4882a593Smuzhiyun int i;
60*4882a593Smuzhiyun static struct { u_long addr; u_long size; } pt[NUM_FLASHBANKS] = {
61*4882a593Smuzhiyun { WINDOW_ADDR0, WINDOW_SIZE0 },
62*4882a593Smuzhiyun { WINDOW_ADDR1, WINDOW_SIZE1 },
63*4882a593Smuzhiyun };
64*4882a593Smuzhiyun int devicesfound = 0;
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun for(i=0; i<NUM_FLASHBANKS; i++)
67*4882a593Smuzhiyun {
68*4882a593Smuzhiyun printk(KERN_NOTICE MSG_PREFIX "probing 0x%08lx at 0x%08lx\n",
69*4882a593Smuzhiyun pt[i].size, pt[i].addr);
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun impa7_map[i].phys = pt[i].addr;
72*4882a593Smuzhiyun impa7_map[i].virt = ioremap(pt[i].addr, pt[i].size);
73*4882a593Smuzhiyun if (!impa7_map[i].virt) {
74*4882a593Smuzhiyun printk(MSG_PREFIX "failed to ioremap\n");
75*4882a593Smuzhiyun return -EIO;
76*4882a593Smuzhiyun }
77*4882a593Smuzhiyun simple_map_init(&impa7_map[i]);
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun impa7_mtd[i] = NULL;
80*4882a593Smuzhiyun type = rom_probe_types;
81*4882a593Smuzhiyun for(; !impa7_mtd[i] && *type; type++) {
82*4882a593Smuzhiyun impa7_mtd[i] = do_map_probe(*type, &impa7_map[i]);
83*4882a593Smuzhiyun }
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun if (impa7_mtd[i]) {
86*4882a593Smuzhiyun impa7_mtd[i]->owner = THIS_MODULE;
87*4882a593Smuzhiyun devicesfound++;
88*4882a593Smuzhiyun mtd_device_register(impa7_mtd[i], partitions,
89*4882a593Smuzhiyun ARRAY_SIZE(partitions));
90*4882a593Smuzhiyun } else {
91*4882a593Smuzhiyun iounmap((void __iomem *)impa7_map[i].virt);
92*4882a593Smuzhiyun }
93*4882a593Smuzhiyun }
94*4882a593Smuzhiyun return devicesfound == 0 ? -ENXIO : 0;
95*4882a593Smuzhiyun }
96*4882a593Smuzhiyun
cleanup_impa7(void)97*4882a593Smuzhiyun static void __exit cleanup_impa7(void)
98*4882a593Smuzhiyun {
99*4882a593Smuzhiyun int i;
100*4882a593Smuzhiyun for (i=0; i<NUM_FLASHBANKS; i++) {
101*4882a593Smuzhiyun if (impa7_mtd[i]) {
102*4882a593Smuzhiyun mtd_device_unregister(impa7_mtd[i]);
103*4882a593Smuzhiyun map_destroy(impa7_mtd[i]);
104*4882a593Smuzhiyun iounmap((void __iomem *)impa7_map[i].virt);
105*4882a593Smuzhiyun impa7_map[i].virt = NULL;
106*4882a593Smuzhiyun }
107*4882a593Smuzhiyun }
108*4882a593Smuzhiyun }
109*4882a593Smuzhiyun
110*4882a593Smuzhiyun module_init(init_impa7);
111*4882a593Smuzhiyun module_exit(cleanup_impa7);
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun MODULE_LICENSE("GPL");
114*4882a593Smuzhiyun MODULE_AUTHOR("Pavel Bartusek <pba@sysgo.de>");
115*4882a593Smuzhiyun MODULE_DESCRIPTION("MTD map driver for implementa impA7");
116