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_find_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 return -ENODEV; 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 pmr = inl(scx200_cb_base + SCx200_PMR); 104 105 if (base == 0 106 || (ctrl & 0x07000000) != 0x07000000 107 || (ctrl & 0x0007ffff) == 0) 108 return -ENODEV; 109 110 size = ((ctrl&0x1fff)<<13) + (1<<13); 111 112 for (u = size; u > 1; u >>= 1) 113 ; 114 if (u != 1) 115 return -ENODEV; 116 117 if (pmr & (1<<6)) 118 width = 16; 119 else 120 width = 8; 121 122 docmem.start = base; 123 docmem.end = base + size; 124 125 if (request_resource(&iomem_resource, &docmem)) { 126 printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n"); 127 return -ENOMEM; 128 } 129 } else { 130 for (u = size; u > 1; u >>= 1) 131 ; 132 if (u != 1) { 133 printk(KERN_ERR NAME ": invalid size for flash mapping\n"); 134 return -EINVAL; 135 } 136 137 if (width != 8 && width != 16) { 138 printk(KERN_ERR NAME ": invalid bus width for flash mapping\n"); 139 return -EINVAL; 140 } 141 142 if (allocate_resource(&iomem_resource, &docmem, 143 size, 144 0xc0000000, 0xffffffff, 145 size, NULL, NULL)) { 146 printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n"); 147 return -ENOMEM; 148 } 149 150 ctrl = 0x07000000 | ((size-1) >> 13); 151 152 printk(KERN_INFO "DOCCS BASE=0x%08lx, CTRL=0x%08lx\n", (long)docmem.start, (long)ctrl); 153 154 pci_write_config_dword(bridge, SCx200_DOCCS_BASE, docmem.start); 155 pci_write_config_dword(bridge, SCx200_DOCCS_CTRL, ctrl); 156 pmr = inl(scx200_cb_base + SCx200_PMR); 157 158 if (width == 8) { 159 pmr &= ~(1<<6); 160 } else { 161 pmr |= (1<<6); 162 } 163 outl(pmr, scx200_cb_base + SCx200_PMR); 164 } 165 166 printk(KERN_INFO NAME ": DOCCS mapped at 0x%llx-0x%llx, width %d\n", 167 (unsigned long long)docmem.start, 168 (unsigned long long)docmem.end, width); 169 170 scx200_docflash_map.size = size; 171 if (width == 8) 172 scx200_docflash_map.bankwidth = 1; 173 else 174 scx200_docflash_map.bankwidth = 2; 175 176 simple_map_init(&scx200_docflash_map); 177 178 scx200_docflash_map.phys = docmem.start; 179 scx200_docflash_map.virt = ioremap(docmem.start, scx200_docflash_map.size); 180 if (!scx200_docflash_map.virt) { 181 printk(KERN_ERR NAME ": failed to ioremap the flash\n"); 182 release_resource(&docmem); 183 return -EIO; 184 } 185 186 mymtd = do_map_probe(flashtype, &scx200_docflash_map); 187 if (!mymtd) { 188 printk(KERN_ERR NAME ": unable to detect flash\n"); 189 iounmap(scx200_docflash_map.virt); 190 release_resource(&docmem); 191 return -ENXIO; 192 } 193 194 if (size < mymtd->size) 195 printk(KERN_WARNING NAME ": warning, flash mapping is smaller than flash size\n"); 196 197 mymtd->owner = THIS_MODULE; 198 199 #ifdef CONFIG_MTD_PARTITIONS 200 partition_info[3].offset = mymtd->size-partition_info[3].size; 201 partition_info[2].size = partition_info[3].offset-partition_info[2].offset; 202 add_mtd_partitions(mymtd, partition_info, NUM_PARTITIONS); 203 #else 204 add_mtd_device(mymtd); 205 #endif 206 return 0; 207 } 208 209 static void __exit cleanup_scx200_docflash(void) 210 { 211 if (mymtd) { 212 #ifdef CONFIG_MTD_PARTITIONS 213 del_mtd_partitions(mymtd); 214 #else 215 del_mtd_device(mymtd); 216 #endif 217 map_destroy(mymtd); 218 } 219 if (scx200_docflash_map.virt) { 220 iounmap(scx200_docflash_map.virt); 221 release_resource(&docmem); 222 } 223 } 224 225 module_init(init_scx200_docflash); 226 module_exit(cleanup_scx200_docflash); 227 228 /* 229 Local variables: 230 compile-command: "make -k -C ../../.. SUBDIRS=drivers/mtd/maps modules" 231 c-basic-offset: 8 232 End: 233 */ 234