1 /* linux/drivers/mtd/maps/scx200_docflash.c 2 3 Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com> 4 5 $Id: scx200_docflash.c,v 1.12 2005/11/07 11:14:28 gleixner Exp $ 6 7 National Semiconductor SCx200 flash mapped with DOCCS 8 */ 9 10 #include <linux/module.h> 11 #include <linux/types.h> 12 #include <linux/kernel.h> 13 #include <linux/init.h> 14 #include <asm/io.h> 15 #include <linux/mtd/mtd.h> 16 #include <linux/mtd/map.h> 17 #include <linux/mtd/partitions.h> 18 19 #include <linux/pci.h> 20 #include <linux/scx200.h> 21 22 #define NAME "scx200_docflash" 23 24 MODULE_AUTHOR("Christer Weinigel <wingel@hack.org>"); 25 MODULE_DESCRIPTION("NatSemi SCx200 DOCCS Flash Driver"); 26 MODULE_LICENSE("GPL"); 27 28 static int probe = 0; /* Don't autoprobe */ 29 static unsigned size = 0x1000000; /* 16 MiB the whole ISA address space */ 30 static unsigned width = 8; /* Default to 8 bits wide */ 31 static char *flashtype = "cfi_probe"; 32 33 module_param(probe, int, 0); 34 MODULE_PARM_DESC(probe, "Probe for a BIOS mapping"); 35 module_param(size, int, 0); 36 MODULE_PARM_DESC(size, "Size of the flash mapping"); 37 module_param(width, int, 0); 38 MODULE_PARM_DESC(width, "Data width of the flash mapping (8/16)"); 39 module_param(flashtype, charp, 0); 40 MODULE_PARM_DESC(flashtype, "Type of MTD probe to do"); 41 42 static struct resource docmem = { 43 .flags = IORESOURCE_MEM, 44 .name = "NatSemi SCx200 DOCCS Flash", 45 }; 46 47 static struct mtd_info *mymtd; 48 49 #ifdef CONFIG_MTD_PARTITIONS 50 static struct mtd_partition partition_info[] = { 51 { 52 .name = "DOCCS Boot kernel", 53 .offset = 0, 54 .size = 0xc0000 55 }, 56 { 57 .name = "DOCCS Low BIOS", 58 .offset = 0xc0000, 59 .size = 0x40000 60 }, 61 { 62 .name = "DOCCS File system", 63 .offset = 0x100000, 64 .size = ~0 /* calculate from flash size */ 65 }, 66 { 67 .name = "DOCCS High BIOS", 68 .offset = ~0, /* calculate from flash size */ 69 .size = 0x80000 70 }, 71 }; 72 #define NUM_PARTITIONS ARRAY_SIZE(partition_info) 73 #endif 74 75 76 static struct map_info scx200_docflash_map = { 77 .name = "NatSemi SCx200 DOCCS Flash", 78 }; 79 80 static int __init init_scx200_docflash(void) 81 { 82 unsigned u; 83 unsigned base; 84 unsigned ctrl; 85 unsigned pmr; 86 struct pci_dev *bridge; 87 88 printk(KERN_DEBUG NAME ": NatSemi SCx200 DOCCS Flash Driver\n"); 89 90 if ((bridge = pci_get_device(PCI_VENDOR_ID_NS, 91 PCI_DEVICE_ID_NS_SCx200_BRIDGE, 92 NULL)) == NULL) 93 return -ENODEV; 94 95 /* check that we have found the configuration block */ 96 if (!scx200_cb_present()) { 97 pci_dev_put(bridge); 98 return -ENODEV; 99 } 100 101 if (probe) { 102 /* Try to use the present flash mapping if any */ 103 pci_read_config_dword(bridge, SCx200_DOCCS_BASE, &base); 104 pci_read_config_dword(bridge, SCx200_DOCCS_CTRL, &ctrl); 105 pci_dev_put(bridge); 106 107 pmr = inl(scx200_cb_base + SCx200_PMR); 108 109 if (base == 0 110 || (ctrl & 0x07000000) != 0x07000000 111 || (ctrl & 0x0007ffff) == 0) 112 return -ENODEV; 113 114 size = ((ctrl&0x1fff)<<13) + (1<<13); 115 116 for (u = size; u > 1; u >>= 1) 117 ; 118 if (u != 1) 119 return -ENODEV; 120 121 if (pmr & (1<<6)) 122 width = 16; 123 else 124 width = 8; 125 126 docmem.start = base; 127 docmem.end = base + size; 128 129 if (request_resource(&iomem_resource, &docmem)) { 130 printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n"); 131 return -ENOMEM; 132 } 133 } else { 134 pci_dev_put(bridge); 135 for (u = size; u > 1; u >>= 1) 136 ; 137 if (u != 1) { 138 printk(KERN_ERR NAME ": invalid size for flash mapping\n"); 139 return -EINVAL; 140 } 141 142 if (width != 8 && width != 16) { 143 printk(KERN_ERR NAME ": invalid bus width for flash mapping\n"); 144 return -EINVAL; 145 } 146 147 if (allocate_resource(&iomem_resource, &docmem, 148 size, 149 0xc0000000, 0xffffffff, 150 size, NULL, NULL)) { 151 printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n"); 152 return -ENOMEM; 153 } 154 155 ctrl = 0x07000000 | ((size-1) >> 13); 156 157 printk(KERN_INFO "DOCCS BASE=0x%08lx, CTRL=0x%08lx\n", (long)docmem.start, (long)ctrl); 158 159 pci_write_config_dword(bridge, SCx200_DOCCS_BASE, docmem.start); 160 pci_write_config_dword(bridge, SCx200_DOCCS_CTRL, ctrl); 161 pmr = inl(scx200_cb_base + SCx200_PMR); 162 163 if (width == 8) { 164 pmr &= ~(1<<6); 165 } else { 166 pmr |= (1<<6); 167 } 168 outl(pmr, scx200_cb_base + SCx200_PMR); 169 } 170 171 printk(KERN_INFO NAME ": DOCCS mapped at 0x%llx-0x%llx, width %d\n", 172 (unsigned long long)docmem.start, 173 (unsigned long long)docmem.end, width); 174 175 scx200_docflash_map.size = size; 176 if (width == 8) 177 scx200_docflash_map.bankwidth = 1; 178 else 179 scx200_docflash_map.bankwidth = 2; 180 181 simple_map_init(&scx200_docflash_map); 182 183 scx200_docflash_map.phys = docmem.start; 184 scx200_docflash_map.virt = ioremap(docmem.start, scx200_docflash_map.size); 185 if (!scx200_docflash_map.virt) { 186 printk(KERN_ERR NAME ": failed to ioremap the flash\n"); 187 release_resource(&docmem); 188 return -EIO; 189 } 190 191 mymtd = do_map_probe(flashtype, &scx200_docflash_map); 192 if (!mymtd) { 193 printk(KERN_ERR NAME ": unable to detect flash\n"); 194 iounmap(scx200_docflash_map.virt); 195 release_resource(&docmem); 196 return -ENXIO; 197 } 198 199 if (size < mymtd->size) 200 printk(KERN_WARNING NAME ": warning, flash mapping is smaller than flash size\n"); 201 202 mymtd->owner = THIS_MODULE; 203 204 #ifdef CONFIG_MTD_PARTITIONS 205 partition_info[3].offset = mymtd->size-partition_info[3].size; 206 partition_info[2].size = partition_info[3].offset-partition_info[2].offset; 207 add_mtd_partitions(mymtd, partition_info, NUM_PARTITIONS); 208 #else 209 add_mtd_device(mymtd); 210 #endif 211 return 0; 212 } 213 214 static void __exit cleanup_scx200_docflash(void) 215 { 216 if (mymtd) { 217 #ifdef CONFIG_MTD_PARTITIONS 218 del_mtd_partitions(mymtd); 219 #else 220 del_mtd_device(mymtd); 221 #endif 222 map_destroy(mymtd); 223 } 224 if (scx200_docflash_map.virt) { 225 iounmap(scx200_docflash_map.virt); 226 release_resource(&docmem); 227 } 228 } 229 230 module_init(init_scx200_docflash); 231 module_exit(cleanup_scx200_docflash); 232 233 /* 234 Local variables: 235 compile-command: "make -k -C ../../.. SUBDIRS=drivers/mtd/maps modules" 236 c-basic-offset: 8 237 End: 238 */ 239