1 /* sbc_gxx.c -- MTD map driver for Arcom Control Systems SBC-MediaGX, 2 SBC-GXm and SBC-GX1 series boards. 3 4 Copyright (C) 2001 Arcom Control System Ltd 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA 19 20 $Id: sbc_gxx.c,v 1.35 2005/11/07 11:14:28 gleixner Exp $ 21 22 The SBC-MediaGX / SBC-GXx has up to 16 MiB of 23 Intel StrataFlash (28F320/28F640) in x8 mode. 24 25 This driver uses the CFI probe and Intel Extended Command Set drivers. 26 27 The flash is accessed as follows: 28 29 16 KiB memory window at 0xdc000-0xdffff 30 31 Two IO address locations for paging 32 33 0x258 34 bit 0-7: address bit 14-21 35 0x259 36 bit 0-1: address bit 22-23 37 bit 7: 0 - reset/powered down 38 1 - device enabled 39 40 The single flash device is divided into 3 partition which appear as 41 separate MTD devices. 42 43 25/04/2001 AJL (Arcom) Modified signon strings and partition sizes 44 (to support bzImages up to 638KiB-ish) 45 */ 46 47 // Includes 48 49 #include <linux/module.h> 50 #include <linux/slab.h> 51 #include <linux/ioport.h> 52 #include <linux/init.h> 53 #include <asm/io.h> 54 55 #include <linux/mtd/mtd.h> 56 #include <linux/mtd/map.h> 57 #include <linux/mtd/partitions.h> 58 59 // Defines 60 61 // - Hardware specific 62 63 #define WINDOW_START 0xdc000 64 65 /* Number of bits in offset. */ 66 #define WINDOW_SHIFT 14 67 #define WINDOW_LENGTH (1 << WINDOW_SHIFT) 68 69 /* The bits for the offset into the window. */ 70 #define WINDOW_MASK (WINDOW_LENGTH-1) 71 #define PAGE_IO 0x258 72 #define PAGE_IO_SIZE 2 73 74 /* bit 7 of 0x259 must be 1 to enable device. */ 75 #define DEVICE_ENABLE 0x8000 76 77 // - Flash / Partition sizing 78 79 #define MAX_SIZE_KiB 16384 80 #define BOOT_PARTITION_SIZE_KiB 768 81 #define DATA_PARTITION_SIZE_KiB 1280 82 #define APP_PARTITION_SIZE_KiB 6144 83 84 // Globals 85 86 static volatile int page_in_window = -1; // Current page in window. 87 static void __iomem *iomapadr; 88 static DEFINE_SPINLOCK(sbc_gxx_spin); 89 90 /* partition_info gives details on the logical partitions that the split the 91 * single flash device into. If the size if zero we use up to the end of the 92 * device. */ 93 static struct mtd_partition partition_info[]={ 94 { .name = "SBC-GXx flash boot partition", 95 .offset = 0, 96 .size = BOOT_PARTITION_SIZE_KiB*1024 }, 97 { .name = "SBC-GXx flash data partition", 98 .offset = BOOT_PARTITION_SIZE_KiB*1024, 99 .size = (DATA_PARTITION_SIZE_KiB)*1024 }, 100 { .name = "SBC-GXx flash application partition", 101 .offset = (BOOT_PARTITION_SIZE_KiB+DATA_PARTITION_SIZE_KiB)*1024 } 102 }; 103 104 #define NUM_PARTITIONS 3 105 106 static inline void sbc_gxx_page(struct map_info *map, unsigned long ofs) 107 { 108 unsigned long page = ofs >> WINDOW_SHIFT; 109 110 if( page!=page_in_window ) { 111 outw( page | DEVICE_ENABLE, PAGE_IO ); 112 page_in_window = page; 113 } 114 } 115 116 117 static map_word sbc_gxx_read8(struct map_info *map, unsigned long ofs) 118 { 119 map_word ret; 120 spin_lock(&sbc_gxx_spin); 121 sbc_gxx_page(map, ofs); 122 ret.x[0] = readb(iomapadr + (ofs & WINDOW_MASK)); 123 spin_unlock(&sbc_gxx_spin); 124 return ret; 125 } 126 127 static void sbc_gxx_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len) 128 { 129 while(len) { 130 unsigned long thislen = len; 131 if (len > (WINDOW_LENGTH - (from & WINDOW_MASK))) 132 thislen = WINDOW_LENGTH-(from & WINDOW_MASK); 133 134 spin_lock(&sbc_gxx_spin); 135 sbc_gxx_page(map, from); 136 memcpy_fromio(to, iomapadr + (from & WINDOW_MASK), thislen); 137 spin_unlock(&sbc_gxx_spin); 138 to += thislen; 139 from += thislen; 140 len -= thislen; 141 } 142 } 143 144 static void sbc_gxx_write8(struct map_info *map, map_word d, unsigned long adr) 145 { 146 spin_lock(&sbc_gxx_spin); 147 sbc_gxx_page(map, adr); 148 writeb(d.x[0], iomapadr + (adr & WINDOW_MASK)); 149 spin_unlock(&sbc_gxx_spin); 150 } 151 152 static void sbc_gxx_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len) 153 { 154 while(len) { 155 unsigned long thislen = len; 156 if (len > (WINDOW_LENGTH - (to & WINDOW_MASK))) 157 thislen = WINDOW_LENGTH-(to & WINDOW_MASK); 158 159 spin_lock(&sbc_gxx_spin); 160 sbc_gxx_page(map, to); 161 memcpy_toio(iomapadr + (to & WINDOW_MASK), from, thislen); 162 spin_unlock(&sbc_gxx_spin); 163 to += thislen; 164 from += thislen; 165 len -= thislen; 166 } 167 } 168 169 static struct map_info sbc_gxx_map = { 170 .name = "SBC-GXx flash", 171 .phys = NO_XIP, 172 .size = MAX_SIZE_KiB*1024, /* this must be set to a maximum possible amount 173 of flash so the cfi probe routines find all 174 the chips */ 175 .bankwidth = 1, 176 .read = sbc_gxx_read8, 177 .copy_from = sbc_gxx_copy_from, 178 .write = sbc_gxx_write8, 179 .copy_to = sbc_gxx_copy_to 180 }; 181 182 /* MTD device for all of the flash. */ 183 static struct mtd_info *all_mtd; 184 185 static void cleanup_sbc_gxx(void) 186 { 187 if( all_mtd ) { 188 del_mtd_partitions( all_mtd ); 189 map_destroy( all_mtd ); 190 } 191 192 iounmap(iomapadr); 193 release_region(PAGE_IO,PAGE_IO_SIZE); 194 } 195 196 static int __init init_sbc_gxx(void) 197 { 198 iomapadr = ioremap(WINDOW_START, WINDOW_LENGTH); 199 if (!iomapadr) { 200 printk( KERN_ERR"%s: failed to ioremap memory region\n", 201 sbc_gxx_map.name ); 202 return -EIO; 203 } 204 205 if (!request_region( PAGE_IO, PAGE_IO_SIZE, "SBC-GXx flash")) { 206 printk( KERN_ERR"%s: IO ports 0x%x-0x%x in use\n", 207 sbc_gxx_map.name, 208 PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1 ); 209 iounmap(iomapadr); 210 return -EAGAIN; 211 } 212 213 214 printk( KERN_INFO"%s: IO:0x%x-0x%x MEM:0x%x-0x%x\n", 215 sbc_gxx_map.name, 216 PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1, 217 WINDOW_START, WINDOW_START+WINDOW_LENGTH-1 ); 218 219 /* Probe for chip. */ 220 all_mtd = do_map_probe( "cfi_probe", &sbc_gxx_map ); 221 if( !all_mtd ) { 222 cleanup_sbc_gxx(); 223 return -ENXIO; 224 } 225 226 all_mtd->owner = THIS_MODULE; 227 228 /* Create MTD devices for each partition. */ 229 add_mtd_partitions(all_mtd, partition_info, NUM_PARTITIONS ); 230 231 return 0; 232 } 233 234 module_init(init_sbc_gxx); 235 module_exit(cleanup_sbc_gxx); 236 237 MODULE_LICENSE("GPL"); 238 MODULE_AUTHOR("Arcom Control Systems Ltd."); 239 MODULE_DESCRIPTION("MTD map driver for SBC-GXm and SBC-GX1 series boards"); 240