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 The SBC-MediaGX / SBC-GXx has up to 16 MiB of 21 Intel StrataFlash (28F320/28F640) in x8 mode. 22 23 This driver uses the CFI probe and Intel Extended Command Set drivers. 24 25 The flash is accessed as follows: 26 27 16 KiB memory window at 0xdc000-0xdffff 28 29 Two IO address locations for paging 30 31 0x258 32 bit 0-7: address bit 14-21 33 0x259 34 bit 0-1: address bit 22-23 35 bit 7: 0 - reset/powered down 36 1 - device enabled 37 38 The single flash device is divided into 3 partition which appear as 39 separate MTD devices. 40 41 25/04/2001 AJL (Arcom) Modified signon strings and partition sizes 42 (to support bzImages up to 638KiB-ish) 43 */ 44 45 // Includes 46 47 #include <linux/module.h> 48 #include <linux/slab.h> 49 #include <linux/ioport.h> 50 #include <linux/init.h> 51 #include <asm/io.h> 52 53 #include <linux/mtd/mtd.h> 54 #include <linux/mtd/map.h> 55 #include <linux/mtd/partitions.h> 56 57 // Defines 58 59 // - Hardware specific 60 61 #define WINDOW_START 0xdc000 62 63 /* Number of bits in offset. */ 64 #define WINDOW_SHIFT 14 65 #define WINDOW_LENGTH (1 << WINDOW_SHIFT) 66 67 /* The bits for the offset into the window. */ 68 #define WINDOW_MASK (WINDOW_LENGTH-1) 69 #define PAGE_IO 0x258 70 #define PAGE_IO_SIZE 2 71 72 /* bit 7 of 0x259 must be 1 to enable device. */ 73 #define DEVICE_ENABLE 0x8000 74 75 // - Flash / Partition sizing 76 77 #define MAX_SIZE_KiB 16384 78 #define BOOT_PARTITION_SIZE_KiB 768 79 #define DATA_PARTITION_SIZE_KiB 1280 80 #define APP_PARTITION_SIZE_KiB 6144 81 82 // Globals 83 84 static volatile int page_in_window = -1; // Current page in window. 85 static void __iomem *iomapadr; 86 static DEFINE_SPINLOCK(sbc_gxx_spin); 87 88 /* partition_info gives details on the logical partitions that the split the 89 * single flash device into. If the size if zero we use up to the end of the 90 * device. */ 91 static struct mtd_partition partition_info[]={ 92 { .name = "SBC-GXx flash boot partition", 93 .offset = 0, 94 .size = BOOT_PARTITION_SIZE_KiB*1024 }, 95 { .name = "SBC-GXx flash data partition", 96 .offset = BOOT_PARTITION_SIZE_KiB*1024, 97 .size = (DATA_PARTITION_SIZE_KiB)*1024 }, 98 { .name = "SBC-GXx flash application partition", 99 .offset = (BOOT_PARTITION_SIZE_KiB+DATA_PARTITION_SIZE_KiB)*1024 } 100 }; 101 102 #define NUM_PARTITIONS 3 103 104 static inline void sbc_gxx_page(struct map_info *map, unsigned long ofs) 105 { 106 unsigned long page = ofs >> WINDOW_SHIFT; 107 108 if( page!=page_in_window ) { 109 outw( page | DEVICE_ENABLE, PAGE_IO ); 110 page_in_window = page; 111 } 112 } 113 114 115 static map_word sbc_gxx_read8(struct map_info *map, unsigned long ofs) 116 { 117 map_word ret; 118 spin_lock(&sbc_gxx_spin); 119 sbc_gxx_page(map, ofs); 120 ret.x[0] = readb(iomapadr + (ofs & WINDOW_MASK)); 121 spin_unlock(&sbc_gxx_spin); 122 return ret; 123 } 124 125 static void sbc_gxx_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len) 126 { 127 while(len) { 128 unsigned long thislen = len; 129 if (len > (WINDOW_LENGTH - (from & WINDOW_MASK))) 130 thislen = WINDOW_LENGTH-(from & WINDOW_MASK); 131 132 spin_lock(&sbc_gxx_spin); 133 sbc_gxx_page(map, from); 134 memcpy_fromio(to, iomapadr + (from & WINDOW_MASK), thislen); 135 spin_unlock(&sbc_gxx_spin); 136 to += thislen; 137 from += thislen; 138 len -= thislen; 139 } 140 } 141 142 static void sbc_gxx_write8(struct map_info *map, map_word d, unsigned long adr) 143 { 144 spin_lock(&sbc_gxx_spin); 145 sbc_gxx_page(map, adr); 146 writeb(d.x[0], iomapadr + (adr & WINDOW_MASK)); 147 spin_unlock(&sbc_gxx_spin); 148 } 149 150 static void sbc_gxx_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len) 151 { 152 while(len) { 153 unsigned long thislen = len; 154 if (len > (WINDOW_LENGTH - (to & WINDOW_MASK))) 155 thislen = WINDOW_LENGTH-(to & WINDOW_MASK); 156 157 spin_lock(&sbc_gxx_spin); 158 sbc_gxx_page(map, to); 159 memcpy_toio(iomapadr + (to & WINDOW_MASK), from, thislen); 160 spin_unlock(&sbc_gxx_spin); 161 to += thislen; 162 from += thislen; 163 len -= thislen; 164 } 165 } 166 167 static struct map_info sbc_gxx_map = { 168 .name = "SBC-GXx flash", 169 .phys = NO_XIP, 170 .size = MAX_SIZE_KiB*1024, /* this must be set to a maximum possible amount 171 of flash so the cfi probe routines find all 172 the chips */ 173 .bankwidth = 1, 174 .read = sbc_gxx_read8, 175 .copy_from = sbc_gxx_copy_from, 176 .write = sbc_gxx_write8, 177 .copy_to = sbc_gxx_copy_to 178 }; 179 180 /* MTD device for all of the flash. */ 181 static struct mtd_info *all_mtd; 182 183 static void cleanup_sbc_gxx(void) 184 { 185 if( all_mtd ) { 186 del_mtd_partitions( all_mtd ); 187 map_destroy( all_mtd ); 188 } 189 190 iounmap(iomapadr); 191 release_region(PAGE_IO,PAGE_IO_SIZE); 192 } 193 194 static int __init init_sbc_gxx(void) 195 { 196 iomapadr = ioremap(WINDOW_START, WINDOW_LENGTH); 197 if (!iomapadr) { 198 printk( KERN_ERR"%s: failed to ioremap memory region\n", 199 sbc_gxx_map.name ); 200 return -EIO; 201 } 202 203 if (!request_region( PAGE_IO, PAGE_IO_SIZE, "SBC-GXx flash")) { 204 printk( KERN_ERR"%s: IO ports 0x%x-0x%x in use\n", 205 sbc_gxx_map.name, 206 PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1 ); 207 iounmap(iomapadr); 208 return -EAGAIN; 209 } 210 211 212 printk( KERN_INFO"%s: IO:0x%x-0x%x MEM:0x%x-0x%x\n", 213 sbc_gxx_map.name, 214 PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1, 215 WINDOW_START, WINDOW_START+WINDOW_LENGTH-1 ); 216 217 /* Probe for chip. */ 218 all_mtd = do_map_probe( "cfi_probe", &sbc_gxx_map ); 219 if( !all_mtd ) { 220 cleanup_sbc_gxx(); 221 return -ENXIO; 222 } 223 224 all_mtd->owner = THIS_MODULE; 225 226 /* Create MTD devices for each partition. */ 227 add_mtd_partitions(all_mtd, partition_info, NUM_PARTITIONS ); 228 229 return 0; 230 } 231 232 module_init(init_sbc_gxx); 233 module_exit(cleanup_sbc_gxx); 234 235 MODULE_LICENSE("GPL"); 236 MODULE_AUTHOR("Arcom Control Systems Ltd."); 237 MODULE_DESCRIPTION("MTD map driver for SBC-GXm and SBC-GX1 series boards"); 238