1/* 2 * NV-RAM memory access on autcpu12 3 * (C) 2002 Thomas Gleixner (gleixner@autronix.de) 4 * 5 * $Id: autcpu12-nvram.c,v 1.1.1.1 2008/10/15 03:26:35 james26_jang 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 */ 22 23#include <linux/module.h> 24#include <linux/types.h> 25#include <linux/kernel.h> 26#include <linux/ioport.h> 27#include <asm/io.h> 28#include <asm/sizes.h> 29#include <asm/hardware.h> 30#include <asm/arch/autcpu12.h> 31#include <linux/mtd/mtd.h> 32#include <linux/mtd/map.h> 33#include <linux/mtd/partitions.h> 34 35__u8 autcpu12_read8(struct map_info *map, unsigned long ofs) 36{ 37 return __raw_readb(map->map_priv_1 + ofs); 38} 39 40__u16 autcpu12_read16(struct map_info *map, unsigned long ofs) 41{ 42 return __raw_readw(map->map_priv_1 + ofs); 43} 44 45__u32 autcpu12_read32(struct map_info *map, unsigned long ofs) 46{ 47 return __raw_readl(map->map_priv_1 + ofs); 48} 49 50void autcpu12_write8(struct map_info *map, __u8 d, unsigned long adr) 51{ 52 __raw_writeb(d, map->map_priv_1 + adr); 53 mb(); 54} 55 56void autcpu12_write16(struct map_info *map, __u16 d, unsigned long adr) 57{ 58 __raw_writew(d, map->map_priv_1 + adr); 59 mb(); 60} 61 62void autcpu12_write32(struct map_info *map, __u32 d, unsigned long adr) 63{ 64 __raw_writel(d, map->map_priv_1 + adr); 65 mb(); 66} 67 68void autcpu12_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len) 69{ 70 memcpy_fromio(to, map->map_priv_1 + from, len); 71} 72 73void autcpu12_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len) 74{ 75 while(len) { 76 __raw_writeb(*(unsigned char *) from, map->map_priv_1 + to); 77 from++; 78 to++; 79 len--; 80 } 81} 82 83static struct mtd_info *sram_mtd; 84 85struct map_info autcpu12_sram_map = { 86 name: "SRAM", 87 size: 32768, 88 buswidth: 8, 89 read8: autcpu12_read8, 90 read16: autcpu12_read16, 91 read32: autcpu12_read32, 92 copy_from: autcpu12_copy_from, 93 write8: autcpu12_write8, 94 write16: autcpu12_write16, 95 write32: autcpu12_write32, 96 copy_to: autcpu12_copy_to 97}; 98 99static int __init init_autcpu12_sram (void) 100{ 101 int err, save0, save1; 102 103 autcpu12_sram_map.map_priv_1 = (unsigned long)ioremap(0x12000000, SZ_128K); 104 if (!autcpu12_sram_map.map_priv_1) { 105 printk("Failed to ioremap autcpu12 NV-RAM space\n"); 106 err = -EIO; 107 goto out; 108 } 109 110 /* 111 * Check for 32K/128K 112 * read ofs 0 113 * read ofs 0x10000 114 * Write complement to ofs 0x100000 115 * Read and check result on ofs 0x0 116 * Restore contents 117 */ 118 save0 = autcpu12_read32(&autcpu12_sram_map,0); 119 save1 = autcpu12_read32(&autcpu12_sram_map,0x10000); 120 autcpu12_write32(&autcpu12_sram_map,~save0,0x10000); 121 /* if we find this pattern on 0x0, we have 32K size 122 * restore contents and exit 123 */ 124 if ( autcpu12_read32(&autcpu12_sram_map,0) != save0) { 125 autcpu12_write32(&autcpu12_sram_map,save0,0x0); 126 goto map; 127 } 128 /* We have a 128K found, restore 0x10000 and set size 129 * to 128K 130 */ 131 autcpu12_write32(&autcpu12_sram_map,save1,0x10000); 132 autcpu12_sram_map.size = SZ_128K; 133 134map: 135 sram_mtd = do_map_probe("map_ram", &autcpu12_sram_map); 136 if (!sram_mtd) { 137 printk("NV-RAM probe failed\n"); 138 err = -ENXIO; 139 goto out_ioremap; 140 } 141 142 sram_mtd->module = THIS_MODULE; 143 sram_mtd->erasesize = 16; 144 145 if (add_mtd_device(sram_mtd)) { 146 printk("NV-RAM device addition failed\n"); 147 err = -ENOMEM; 148 goto out_probe; 149 } 150 151 printk("NV-RAM device size %ldK registered on AUTCPU12\n",autcpu12_sram_map.size/SZ_1K); 152 153 return 0; 154 155out_probe: 156 map_destroy(sram_mtd); 157 sram_mtd = 0; 158 159out_ioremap: 160 iounmap((void *)autcpu12_sram_map.map_priv_1); 161out: 162 return err; 163} 164 165static void __exit cleanup_autcpu12_maps(void) 166{ 167 if (sram_mtd) { 168 del_mtd_device(sram_mtd); 169 map_destroy(sram_mtd); 170 iounmap((void *)autcpu12_sram_map.map_priv_1); 171 } 172} 173 174module_init(init_autcpu12_sram); 175module_exit(cleanup_autcpu12_maps); 176 177MODULE_AUTHOR("Thomas Gleixner"); 178MODULE_DESCRIPTION("autcpu12 NV-RAM map driver"); 179MODULE_LICENSE("GPL"); 180