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 20The SBC-MediaGX / SBC-GXx has up to 16 MiB of 21Intel StrataFlash (28F320/28F640) in x8 mode. 22 23This driver uses the CFI probe and Intel Extended Command Set drivers. 24 25The 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 38The single flash device is divided into 3 partition which appear as 39separate MTD devices. 40 4125/04/2001 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/ioport.h> 49#include <linux/init.h> 50#include <asm/io.h> 51 52#include <linux/mtd/mtd.h> 53#include <linux/mtd/map.h> 54#include <linux/mtd/partitions.h> 55 56// Defines 57 58// - Hardware specific 59 60#define WINDOW_START 0xdc000 61 62/* Number of bits in offset. */ 63#define WINDOW_SHIFT 14 64#define WINDOW_LENGTH (1 << WINDOW_SHIFT) 65 66/* The bits for the offset into the window. */ 67#define WINDOW_MASK (WINDOW_LENGTH-1) 68#define PAGE_IO 0x258 69#define PAGE_IO_SIZE 2 70 71/* bit 7 of 0x259 must be 1 to enable device. */ 72#define DEVICE_ENABLE 0x8000 73 74// - Flash / Partition sizing 75 76#define MAX_SIZE_KiB 16384 77#define BOOT_PARTITION_SIZE_KiB 768 78#define DATA_PARTITION_SIZE_KiB 1280 79#define APP_PARTITION_SIZE_KiB 6144 80 81// Globals 82 83static volatile int page_in_window = -1; // Current page in window. 84static void __iomem *iomapadr; 85static DEFINE_SPINLOCK(sbc_gxx_spin); 86 87/* partition_info gives details on the logical partitions that the split the 88 * single flash device into. If the size if zero we use up to the end of the 89 * device. */ 90static struct mtd_partition partition_info[]={ 91 { .name = "SBC-GXx flash boot partition", 92 .offset = 0, 93 .size = BOOT_PARTITION_SIZE_KiB*1024 }, 94 { .name = "SBC-GXx flash data partition", 95 .offset = BOOT_PARTITION_SIZE_KiB*1024, 96 .size = (DATA_PARTITION_SIZE_KiB)*1024 }, 97 { .name = "SBC-GXx flash application partition", 98 .offset = (BOOT_PARTITION_SIZE_KiB+DATA_PARTITION_SIZE_KiB)*1024 } 99}; 100 101#define NUM_PARTITIONS 3 102 103static inline void sbc_gxx_page(struct map_info *map, unsigned long ofs) 104{ 105 unsigned long page = ofs >> WINDOW_SHIFT; 106 107 if( page!=page_in_window ) { 108 outw( page | DEVICE_ENABLE, PAGE_IO ); 109 page_in_window = page; 110 } 111} 112 113 114static map_word sbc_gxx_read8(struct map_info *map, unsigned long ofs) 115{ 116 map_word ret; 117 spin_lock(&sbc_gxx_spin); 118 sbc_gxx_page(map, ofs); 119 ret.x[0] = readb(iomapadr + (ofs & WINDOW_MASK)); 120 spin_unlock(&sbc_gxx_spin); 121 return ret; 122} 123 124static void sbc_gxx_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len) 125{ 126 while(len) { 127 unsigned long thislen = len; 128 if (len > (WINDOW_LENGTH - (from & WINDOW_MASK))) 129 thislen = WINDOW_LENGTH-(from & WINDOW_MASK); 130 131 spin_lock(&sbc_gxx_spin); 132 sbc_gxx_page(map, from); 133 memcpy_fromio(to, iomapadr + (from & WINDOW_MASK), thislen); 134 spin_unlock(&sbc_gxx_spin); 135 to += thislen; 136 from += thislen; 137 len -= thislen; 138 } 139} 140 141static void sbc_gxx_write8(struct map_info *map, map_word d, unsigned long adr) 142{ 143 spin_lock(&sbc_gxx_spin); 144 sbc_gxx_page(map, adr); 145 writeb(d.x[0], iomapadr + (adr & WINDOW_MASK)); 146 spin_unlock(&sbc_gxx_spin); 147} 148 149static void sbc_gxx_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len) 150{ 151 while(len) { 152 unsigned long thislen = len; 153 if (len > (WINDOW_LENGTH - (to & WINDOW_MASK))) 154 thislen = WINDOW_LENGTH-(to & WINDOW_MASK); 155 156 spin_lock(&sbc_gxx_spin); 157 sbc_gxx_page(map, to); 158 memcpy_toio(iomapadr + (to & WINDOW_MASK), from, thislen); 159 spin_unlock(&sbc_gxx_spin); 160 to += thislen; 161 from += thislen; 162 len -= thislen; 163 } 164} 165 166static struct map_info sbc_gxx_map = { 167 .name = "SBC-GXx flash", 168 .phys = NO_XIP, 169 .size = MAX_SIZE_KiB*1024, /* this must be set to a maximum possible amount 170 of flash so the cfi probe routines find all 171 the chips */ 172 .bankwidth = 1, 173 .read = sbc_gxx_read8, 174 .copy_from = sbc_gxx_copy_from, 175 .write = sbc_gxx_write8, 176 .copy_to = sbc_gxx_copy_to 177}; 178 179/* MTD device for all of the flash. */ 180static struct mtd_info *all_mtd; 181 182static void cleanup_sbc_gxx(void) 183{ 184 if( all_mtd ) { 185 del_mtd_partitions( all_mtd ); 186 map_destroy( all_mtd ); 187 } 188 189 iounmap(iomapadr); 190 release_region(PAGE_IO,PAGE_IO_SIZE); 191} 192 193static int __init init_sbc_gxx(void) 194{ 195 iomapadr = ioremap(WINDOW_START, WINDOW_LENGTH); 196 if (!iomapadr) { 197 printk( KERN_ERR"%s: failed to ioremap memory region\n", 198 sbc_gxx_map.name ); 199 return -EIO; 200 } 201 202 if (!request_region( PAGE_IO, PAGE_IO_SIZE, "SBC-GXx flash")) { 203 printk( KERN_ERR"%s: IO ports 0x%x-0x%x in use\n", 204 sbc_gxx_map.name, 205 PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1 ); 206 iounmap(iomapadr); 207 return -EAGAIN; 208 } 209 210 211 printk( KERN_INFO"%s: IO:0x%x-0x%x MEM:0x%x-0x%x\n", 212 sbc_gxx_map.name, 213 PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1, 214 WINDOW_START, WINDOW_START+WINDOW_LENGTH-1 ); 215 216 /* Probe for chip. */ 217 all_mtd = do_map_probe( "cfi_probe", &sbc_gxx_map ); 218 if( !all_mtd ) { 219 cleanup_sbc_gxx(); 220 return -ENXIO; 221 } 222 223 all_mtd->owner = THIS_MODULE; 224 225 /* Create MTD devices for each partition. */ 226 add_mtd_partitions(all_mtd, partition_info, NUM_PARTITIONS ); 227 228 return 0; 229} 230 231module_init(init_sbc_gxx); 232module_exit(cleanup_sbc_gxx); 233 234MODULE_LICENSE("GPL"); 235MODULE_AUTHOR("Arcom Control Systems Ltd."); 236MODULE_DESCRIPTION("MTD map driver for SBC-GXm and SBC-GX1 series boards"); 237