1 /* linux/drivers/mtd/maps/scx200_docflash.c 2 3 Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com> 4 5 National Semiconductor SCx200 flash mapped with DOCCS 6 */ 7 8 #include <linux/module.h> 9 #include <linux/types.h> 10 #include <linux/kernel.h> 11 #include <linux/init.h> 12 #include <asm/io.h> 13 #include <linux/mtd/mtd.h> 14 #include <linux/mtd/map.h> 15 #include <linux/mtd/partitions.h> 16 17 #include <linux/pci.h> 18 #include <linux/scx200.h> 19 20 #define NAME "scx200_docflash" 21 22 MODULE_AUTHOR("Christer Weinigel <wingel@hack.org>"); 23 MODULE_DESCRIPTION("NatSemi SCx200 DOCCS Flash Driver"); 24 MODULE_LICENSE("GPL"); 25 26 static int probe = 0; /* Don't autoprobe */ 27 static unsigned size = 0x1000000; /* 16 MiB the whole ISA address space */ 28 static unsigned width = 8; /* Default to 8 bits wide */ 29 static char *flashtype = "cfi_probe"; 30 31 module_param(probe, int, 0); 32 MODULE_PARM_DESC(probe, "Probe for a BIOS mapping"); 33 module_param(size, int, 0); 34 MODULE_PARM_DESC(size, "Size of the flash mapping"); 35 module_param(width, int, 0); 36 MODULE_PARM_DESC(width, "Data width of the flash mapping (8/16)"); 37 module_param(flashtype, charp, 0); 38 MODULE_PARM_DESC(flashtype, "Type of MTD probe to do"); 39 40 static struct resource docmem = { 41 .flags = IORESOURCE_MEM, 42 .name = "NatSemi SCx200 DOCCS Flash", 43 }; 44 45 static struct mtd_info *mymtd; 46 47 #ifdef CONFIG_MTD_PARTITIONS 48 static struct mtd_partition partition_info[] = { 49 { 50 .name = "DOCCS Boot kernel", 51 .offset = 0, 52 .size = 0xc0000 53 }, 54 { 55 .name = "DOCCS Low BIOS", 56 .offset = 0xc0000, 57 .size = 0x40000 58 }, 59 { 60 .name = "DOCCS File system", 61 .offset = 0x100000, 62 .size = ~0 /* calculate from flash size */ 63 }, 64 { 65 .name = "DOCCS High BIOS", 66 .offset = ~0, /* calculate from flash size */ 67 .size = 0x80000 68 }, 69 }; 70 #define NUM_PARTITIONS ARRAY_SIZE(partition_info) 71 #endif 72 73 74 static struct map_info scx200_docflash_map = { 75 .name = "NatSemi SCx200 DOCCS Flash", 76 }; 77 78 static int __init init_scx200_docflash(void) 79 { 80 unsigned u; 81 unsigned base; 82 unsigned ctrl; 83 unsigned pmr; 84 struct pci_dev *bridge; 85 86 printk(KERN_DEBUG NAME ": NatSemi SCx200 DOCCS Flash Driver\n"); 87 88 if ((bridge = pci_get_device(PCI_VENDOR_ID_NS, 89 PCI_DEVICE_ID_NS_SCx200_BRIDGE, 90 NULL)) == NULL) 91 return -ENODEV; 92 93 /* check that we have found the configuration block */ 94 if (!scx200_cb_present()) { 95 pci_dev_put(bridge); 96 return -ENODEV; 97 } 98 99 if (probe) { 100 /* Try to use the present flash mapping if any */ 101 pci_read_config_dword(bridge, SCx200_DOCCS_BASE, &base); 102 pci_read_config_dword(bridge, SCx200_DOCCS_CTRL, &ctrl); 103 pci_dev_put(bridge); 104 105 pmr = inl(scx200_cb_base + SCx200_PMR); 106 107 if (base == 0 108 || (ctrl & 0x07000000) != 0x07000000 109 || (ctrl & 0x0007ffff) == 0) 110 return -ENODEV; 111 112 size = ((ctrl&0x1fff)<<13) + (1<<13); 113 114 for (u = size; u > 1; u >>= 1) 115 ; 116 if (u != 1) 117 return -ENODEV; 118 119 if (pmr & (1<<6)) 120 width = 16; 121 else 122 width = 8; 123 124 docmem.start = base; 125 docmem.end = base + size; 126 127 if (request_resource(&iomem_resource, &docmem)) { 128 printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n"); 129 return -ENOMEM; 130 } 131 } else { 132 pci_dev_put(bridge); 133 for (u = size; u > 1; u >>= 1) 134 ; 135 if (u != 1) { 136 printk(KERN_ERR NAME ": invalid size for flash mapping\n"); 137 return -EINVAL; 138 } 139 140 if (width != 8 && width != 16) { 141 printk(KERN_ERR NAME ": invalid bus width for flash mapping\n"); 142 return -EINVAL; 143 } 144 145 if (allocate_resource(&iomem_resource, &docmem, 146 size, 147 0xc0000000, 0xffffffff, 148 size, NULL, NULL)) { 149 printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n"); 150 return -ENOMEM; 151 } 152 153 ctrl = 0x07000000 | ((size-1) >> 13); 154 155 printk(KERN_INFO "DOCCS BASE=0x%08lx, CTRL=0x%08lx\n", (long)docmem.start, (long)ctrl); 156 157 pci_write_config_dword(bridge, SCx200_DOCCS_BASE, docmem.start); 158 pci_write_config_dword(bridge, SCx200_DOCCS_CTRL, ctrl); 159 pmr = inl(scx200_cb_base + SCx200_PMR); 160 161 if (width == 8) { 162 pmr &= ~(1<<6); 163 } else { 164 pmr |= (1<<6); 165 } 166 outl(pmr, scx200_cb_base + SCx200_PMR); 167 } 168 169 printk(KERN_INFO NAME ": DOCCS mapped at 0x%llx-0x%llx, width %d\n", 170 (unsigned long long)docmem.start, 171 (unsigned long long)docmem.end, width); 172 173 scx200_docflash_map.size = size; 174 if (width == 8) 175 scx200_docflash_map.bankwidth = 1; 176 else 177 scx200_docflash_map.bankwidth = 2; 178 179 simple_map_init(&scx200_docflash_map); 180 181 scx200_docflash_map.phys = docmem.start; 182 scx200_docflash_map.virt = ioremap(docmem.start, scx200_docflash_map.size); 183 if (!scx200_docflash_map.virt) { 184 printk(KERN_ERR NAME ": failed to ioremap the flash\n"); 185 release_resource(&docmem); 186 return -EIO; 187 } 188 189 mymtd = do_map_probe(flashtype, &scx200_docflash_map); 190 if (!mymtd) { 191 printk(KERN_ERR NAME ": unable to detect flash\n"); 192 iounmap(scx200_docflash_map.virt); 193 release_resource(&docmem); 194 return -ENXIO; 195 } 196 197 if (size < mymtd->size) 198 printk(KERN_WARNING NAME ": warning, flash mapping is smaller than flash size\n"); 199 200 mymtd->owner = THIS_MODULE; 201 202 #ifdef CONFIG_MTD_PARTITIONS 203 partition_info[3].offset = mymtd->size-partition_info[3].size; 204 partition_info[2].size = partition_info[3].offset-partition_info[2].offset; 205 add_mtd_partitions(mymtd, partition_info, NUM_PARTITIONS); 206 #else 207 add_mtd_device(mymtd); 208 #endif 209 return 0; 210 } 211 212 static void __exit cleanup_scx200_docflash(void) 213 { 214 if (mymtd) { 215 #ifdef CONFIG_MTD_PARTITIONS 216 del_mtd_partitions(mymtd); 217 #else 218 del_mtd_device(mymtd); 219 #endif 220 map_destroy(mymtd); 221 } 222 if (scx200_docflash_map.virt) { 223 iounmap(scx200_docflash_map.virt); 224 release_resource(&docmem); 225 } 226 } 227 228 module_init(init_scx200_docflash); 229 module_exit(cleanup_scx200_docflash); 230 231 /* 232 Local variables: 233 compile-command: "make -k -C ../../.. SUBDIRS=drivers/mtd/maps modules" 234 c-basic-offset: 8 235 End: 236 */ 237