1 // SPDX-License-Identifier: GPL-2.0-only 2 /* linux/drivers/mtd/maps/scx200_docflash.c 3 4 Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com> 5 6 National Semiconductor SCx200 flash mapped with DOCCS 7 */ 8 9 #include <linux/module.h> 10 #include <linux/types.h> 11 #include <linux/kernel.h> 12 #include <linux/init.h> 13 #include <asm/io.h> 14 #include <linux/mtd/mtd.h> 15 #include <linux/mtd/map.h> 16 #include <linux/mtd/partitions.h> 17 18 #include <linux/pci.h> 19 #include <linux/scx200.h> 20 21 #define NAME "scx200_docflash" 22 23 MODULE_AUTHOR("Christer Weinigel <wingel@hack.org>"); 24 MODULE_DESCRIPTION("NatSemi SCx200 DOCCS Flash Driver"); 25 MODULE_LICENSE("GPL"); 26 27 static int probe = 0; /* Don't autoprobe */ 28 static unsigned size = 0x1000000; /* 16 MiB the whole ISA address space */ 29 static unsigned width = 8; /* Default to 8 bits wide */ 30 static char *flashtype = "cfi_probe"; 31 32 module_param(probe, int, 0); 33 MODULE_PARM_DESC(probe, "Probe for a BIOS mapping"); 34 module_param(size, int, 0); 35 MODULE_PARM_DESC(size, "Size of the flash mapping"); 36 module_param(width, int, 0); 37 MODULE_PARM_DESC(width, "Data width of the flash mapping (8/16)"); 38 module_param(flashtype, charp, 0); 39 MODULE_PARM_DESC(flashtype, "Type of MTD probe to do"); 40 41 static struct resource docmem = { 42 .flags = IORESOURCE_MEM, 43 .name = "NatSemi SCx200 DOCCS Flash", 44 }; 45 46 static struct mtd_info *mymtd; 47 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 72 static struct map_info scx200_docflash_map = { 73 .name = "NatSemi SCx200 DOCCS Flash", 74 }; 75 76 static int __init init_scx200_docflash(void) 77 { 78 unsigned u; 79 unsigned base; 80 unsigned ctrl; 81 unsigned pmr; 82 struct pci_dev *bridge; 83 84 printk(KERN_DEBUG NAME ": NatSemi SCx200 DOCCS Flash Driver\n"); 85 86 if ((bridge = pci_get_device(PCI_VENDOR_ID_NS, 87 PCI_DEVICE_ID_NS_SCx200_BRIDGE, 88 NULL)) == NULL) 89 return -ENODEV; 90 91 /* check that we have found the configuration block */ 92 if (!scx200_cb_present()) { 93 pci_dev_put(bridge); 94 return -ENODEV; 95 } 96 97 if (probe) { 98 /* Try to use the present flash mapping if any */ 99 pci_read_config_dword(bridge, SCx200_DOCCS_BASE, &base); 100 pci_read_config_dword(bridge, SCx200_DOCCS_CTRL, &ctrl); 101 pci_dev_put(bridge); 102 103 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 pci_dev_put(bridge); 131 for (u = size; u > 1; u >>= 1) 132 ; 133 if (u != 1) { 134 printk(KERN_ERR NAME ": invalid size for flash mapping\n"); 135 return -EINVAL; 136 } 137 138 if (width != 8 && width != 16) { 139 printk(KERN_ERR NAME ": invalid bus width for flash mapping\n"); 140 return -EINVAL; 141 } 142 143 if (allocate_resource(&iomem_resource, &docmem, 144 size, 145 0xc0000000, 0xffffffff, 146 size, NULL, NULL)) { 147 printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n"); 148 return -ENOMEM; 149 } 150 151 ctrl = 0x07000000 | ((size-1) >> 13); 152 153 printk(KERN_INFO "DOCCS BASE=0x%08lx, CTRL=0x%08lx\n", (long)docmem.start, (long)ctrl); 154 155 pci_write_config_dword(bridge, SCx200_DOCCS_BASE, docmem.start); 156 pci_write_config_dword(bridge, SCx200_DOCCS_CTRL, ctrl); 157 pmr = inl(scx200_cb_base + SCx200_PMR); 158 159 if (width == 8) { 160 pmr &= ~(1<<6); 161 } else { 162 pmr |= (1<<6); 163 } 164 outl(pmr, scx200_cb_base + SCx200_PMR); 165 } 166 167 printk(KERN_INFO NAME ": DOCCS mapped at %pR, width %d\n", 168 &docmem, 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 partition_info[3].offset = mymtd->size-partition_info[3].size; 200 partition_info[2].size = partition_info[3].offset-partition_info[2].offset; 201 mtd_device_register(mymtd, partition_info, NUM_PARTITIONS); 202 203 return 0; 204 } 205 206 static void __exit cleanup_scx200_docflash(void) 207 { 208 if (mymtd) { 209 mtd_device_unregister(mymtd); 210 map_destroy(mymtd); 211 } 212 if (scx200_docflash_map.virt) { 213 iounmap(scx200_docflash_map.virt); 214 release_resource(&docmem); 215 } 216 } 217 218 module_init(init_scx200_docflash); 219 module_exit(cleanup_scx200_docflash); 220