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 static struct mtd_partition partition_info[] = { 48 { 49 .name = "DOCCS Boot kernel", 50 .offset = 0, 51 .size = 0xc0000 52 }, 53 { 54 .name = "DOCCS Low BIOS", 55 .offset = 0xc0000, 56 .size = 0x40000 57 }, 58 { 59 .name = "DOCCS File system", 60 .offset = 0x100000, 61 .size = ~0 /* calculate from flash size */ 62 }, 63 { 64 .name = "DOCCS High BIOS", 65 .offset = ~0, /* calculate from flash size */ 66 .size = 0x80000 67 }, 68 }; 69 #define NUM_PARTITIONS ARRAY_SIZE(partition_info) 70 71 static struct map_info scx200_docflash_map = { 72 .name = "NatSemi SCx200 DOCCS Flash", 73 }; 74 75 static int __init init_scx200_docflash(void) 76 { 77 unsigned u; 78 unsigned base; 79 unsigned ctrl; 80 unsigned pmr; 81 struct pci_dev *bridge; 82 83 printk(KERN_DEBUG NAME ": NatSemi SCx200 DOCCS Flash Driver\n"); 84 85 if ((bridge = pci_get_device(PCI_VENDOR_ID_NS, 86 PCI_DEVICE_ID_NS_SCx200_BRIDGE, 87 NULL)) == NULL) 88 return -ENODEV; 89 90 /* check that we have found the configuration block */ 91 if (!scx200_cb_present()) { 92 pci_dev_put(bridge); 93 return -ENODEV; 94 } 95 96 if (probe) { 97 /* Try to use the present flash mapping if any */ 98 pci_read_config_dword(bridge, SCx200_DOCCS_BASE, &base); 99 pci_read_config_dword(bridge, SCx200_DOCCS_CTRL, &ctrl); 100 pci_dev_put(bridge); 101 102 pmr = inl(scx200_cb_base + SCx200_PMR); 103 104 if (base == 0 105 || (ctrl & 0x07000000) != 0x07000000 106 || (ctrl & 0x0007ffff) == 0) 107 return -ENODEV; 108 109 size = ((ctrl&0x1fff)<<13) + (1<<13); 110 111 for (u = size; u > 1; u >>= 1) 112 ; 113 if (u != 1) 114 return -ENODEV; 115 116 if (pmr & (1<<6)) 117 width = 16; 118 else 119 width = 8; 120 121 docmem.start = base; 122 docmem.end = base + size; 123 124 if (request_resource(&iomem_resource, &docmem)) { 125 printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n"); 126 return -ENOMEM; 127 } 128 } else { 129 pci_dev_put(bridge); 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 %pR, width %d\n", 167 &docmem, width); 168 169 scx200_docflash_map.size = size; 170 if (width == 8) 171 scx200_docflash_map.bankwidth = 1; 172 else 173 scx200_docflash_map.bankwidth = 2; 174 175 simple_map_init(&scx200_docflash_map); 176 177 scx200_docflash_map.phys = docmem.start; 178 scx200_docflash_map.virt = ioremap(docmem.start, scx200_docflash_map.size); 179 if (!scx200_docflash_map.virt) { 180 printk(KERN_ERR NAME ": failed to ioremap the flash\n"); 181 release_resource(&docmem); 182 return -EIO; 183 } 184 185 mymtd = do_map_probe(flashtype, &scx200_docflash_map); 186 if (!mymtd) { 187 printk(KERN_ERR NAME ": unable to detect flash\n"); 188 iounmap(scx200_docflash_map.virt); 189 release_resource(&docmem); 190 return -ENXIO; 191 } 192 193 if (size < mymtd->size) 194 printk(KERN_WARNING NAME ": warning, flash mapping is smaller than flash size\n"); 195 196 mymtd->owner = THIS_MODULE; 197 198 partition_info[3].offset = mymtd->size-partition_info[3].size; 199 partition_info[2].size = partition_info[3].offset-partition_info[2].offset; 200 mtd_device_register(mymtd, partition_info, NUM_PARTITIONS); 201 202 return 0; 203 } 204 205 static void __exit cleanup_scx200_docflash(void) 206 { 207 if (mymtd) { 208 mtd_device_unregister(mymtd); 209 map_destroy(mymtd); 210 } 211 if (scx200_docflash_map.virt) { 212 iounmap(scx200_docflash_map.virt); 213 release_resource(&docmem); 214 } 215 } 216 217 module_init(init_scx200_docflash); 218 module_exit(cleanup_scx200_docflash); 219