ia64/linux-2.6.18-xen.hg

view drivers/mtd/maps/autcpu12-nvram.c @ 912:dd42cdb0ab89

[IA64] Build blktap2 driver by default in x86 builds.

add CONFIG_XEN_BLKDEV_TAP2=y to buildconfigs/linux-defconfig_xen_ia64.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Isaku Yamahata <yamahata@valinux.co.jp>
date Mon Jun 29 12:09:16 2009 +0900 (2009-06-29)
parents 831230e53067
children
line source
1 /*
2 * NV-RAM memory access on autcpu12
3 * (C) 2002 Thomas Gleixner (gleixner@autronix.de)
4 *
5 * $Id: autcpu12-nvram.c,v 1.9 2005/11/07 11:14:26 gleixner Exp $
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 */
23 #include <linux/module.h>
24 #include <linux/types.h>
25 #include <linux/kernel.h>
26 #include <linux/ioport.h>
27 #include <linux/init.h>
28 #include <asm/io.h>
29 #include <asm/sizes.h>
30 #include <asm/hardware.h>
31 #include <asm/arch/autcpu12.h>
32 #include <linux/mtd/mtd.h>
33 #include <linux/mtd/map.h>
34 #include <linux/mtd/partitions.h>
37 static struct mtd_info *sram_mtd;
39 struct map_info autcpu12_sram_map = {
40 .name = "SRAM",
41 .size = 32768,
42 .bankwidth = 4,
43 .phys = 0x12000000,
44 };
46 static int __init init_autcpu12_sram (void)
47 {
48 int err, save0, save1;
50 autcpu12_sram_map.virt = ioremap(0x12000000, SZ_128K);
51 if (!autcpu12_sram_map.virt) {
52 printk("Failed to ioremap autcpu12 NV-RAM space\n");
53 err = -EIO;
54 goto out;
55 }
56 simple_map_init(&autcpu_sram_map);
58 /*
59 * Check for 32K/128K
60 * read ofs 0
61 * read ofs 0x10000
62 * Write complement to ofs 0x100000
63 * Read and check result on ofs 0x0
64 * Restore contents
65 */
66 save0 = map_read32(&autcpu12_sram_map,0);
67 save1 = map_read32(&autcpu12_sram_map,0x10000);
68 map_write32(&autcpu12_sram_map,~save0,0x10000);
69 /* if we find this pattern on 0x0, we have 32K size
70 * restore contents and exit
71 */
72 if ( map_read32(&autcpu12_sram_map,0) != save0) {
73 map_write32(&autcpu12_sram_map,save0,0x0);
74 goto map;
75 }
76 /* We have a 128K found, restore 0x10000 and set size
77 * to 128K
78 */
79 map_write32(&autcpu12_sram_map,save1,0x10000);
80 autcpu12_sram_map.size = SZ_128K;
82 map:
83 sram_mtd = do_map_probe("map_ram", &autcpu12_sram_map);
84 if (!sram_mtd) {
85 printk("NV-RAM probe failed\n");
86 err = -ENXIO;
87 goto out_ioremap;
88 }
90 sram_mtd->owner = THIS_MODULE;
91 sram_mtd->erasesize = 16;
93 if (add_mtd_device(sram_mtd)) {
94 printk("NV-RAM device addition failed\n");
95 err = -ENOMEM;
96 goto out_probe;
97 }
99 printk("NV-RAM device size %ldKiB registered on AUTCPU12\n",autcpu12_sram_map.size/SZ_1K);
101 return 0;
103 out_probe:
104 map_destroy(sram_mtd);
105 sram_mtd = 0;
107 out_ioremap:
108 iounmap((void *)autcpu12_sram_map.virt);
109 out:
110 return err;
111 }
113 static void __exit cleanup_autcpu12_maps(void)
114 {
115 if (sram_mtd) {
116 del_mtd_device(sram_mtd);
117 map_destroy(sram_mtd);
118 iounmap((void *)autcpu12_sram_map.virt);
119 }
120 }
122 module_init(init_autcpu12_sram);
123 module_exit(cleanup_autcpu12_maps);
125 MODULE_AUTHOR("Thomas Gleixner");
126 MODULE_DESCRIPTION("autcpu12 NV-RAM map driver");
127 MODULE_LICENSE("GPL");