xref: /openbmc/linux/drivers/mtd/maps/impa7.c (revision f5c27da4)
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");
116