1 /* 2 * TURBOchannel bus services. 3 * 4 * Copyright (c) Harald Koerfgen, 1998 5 * Copyright (c) 2001, 2003, 2005, 2006 Maciej W. Rozycki 6 * Copyright (c) 2005 James Simmons 7 * 8 * This file is subject to the terms and conditions of the GNU 9 * General Public License. See the file "COPYING" in the main 10 * directory of this archive for more details. 11 */ 12 #include <linux/compiler.h> 13 #include <linux/errno.h> 14 #include <linux/init.h> 15 #include <linux/ioport.h> 16 #include <linux/kernel.h> 17 #include <linux/list.h> 18 #include <linux/module.h> 19 #include <linux/slab.h> 20 #include <linux/string.h> 21 #include <linux/tc.h> 22 #include <linux/types.h> 23 24 #include <asm/io.h> 25 26 static struct tc_bus tc_bus = { 27 .name = "TURBOchannel", 28 }; 29 30 /* 31 * Probing for TURBOchannel modules. 32 */ 33 static void __init tc_bus_add_devices(struct tc_bus *tbus) 34 { 35 resource_size_t slotsize = tbus->info.slot_size << 20; 36 resource_size_t extslotsize = tbus->ext_slot_size; 37 resource_size_t slotaddr; 38 resource_size_t extslotaddr; 39 resource_size_t devsize; 40 void __iomem *module; 41 struct tc_dev *tdev; 42 int i, slot, err; 43 u8 pattern[4]; 44 long offset; 45 46 for (slot = 0; slot < tbus->num_tcslots; slot++) { 47 slotaddr = tbus->slot_base + slot * slotsize; 48 extslotaddr = tbus->ext_slot_base + slot * extslotsize; 49 module = ioremap_nocache(slotaddr, slotsize); 50 BUG_ON(!module); 51 52 offset = TC_OLDCARD; 53 54 err = 0; 55 err |= tc_preadb(pattern + 0, module + offset + TC_PATTERN0); 56 err |= tc_preadb(pattern + 1, module + offset + TC_PATTERN1); 57 err |= tc_preadb(pattern + 2, module + offset + TC_PATTERN2); 58 err |= tc_preadb(pattern + 3, module + offset + TC_PATTERN3); 59 if (err) 60 goto out_err; 61 62 if (pattern[0] != 0x55 || pattern[1] != 0x00 || 63 pattern[2] != 0xaa || pattern[3] != 0xff) { 64 offset = TC_NEWCARD; 65 66 err = 0; 67 err |= tc_preadb(pattern + 0, 68 module + offset + TC_PATTERN0); 69 err |= tc_preadb(pattern + 1, 70 module + offset + TC_PATTERN1); 71 err |= tc_preadb(pattern + 2, 72 module + offset + TC_PATTERN2); 73 err |= tc_preadb(pattern + 3, 74 module + offset + TC_PATTERN3); 75 if (err) 76 goto out_err; 77 } 78 79 if (pattern[0] != 0x55 || pattern[1] != 0x00 || 80 pattern[2] != 0xaa || pattern[3] != 0xff) 81 goto out_err; 82 83 /* Found a board, allocate it an entry in the list */ 84 tdev = kzalloc(sizeof(*tdev), GFP_KERNEL); 85 if (!tdev) { 86 printk(KERN_ERR "tc%x: unable to allocate tc_dev\n", 87 slot); 88 goto out_err; 89 } 90 dev_set_name(&tdev->dev, "tc%x", slot); 91 tdev->bus = tbus; 92 tdev->dev.parent = &tbus->dev; 93 tdev->dev.bus = &tc_bus_type; 94 tdev->slot = slot; 95 96 for (i = 0; i < 8; i++) { 97 tdev->firmware[i] = 98 readb(module + offset + TC_FIRM_VER + 4 * i); 99 tdev->vendor[i] = 100 readb(module + offset + TC_VENDOR + 4 * i); 101 tdev->name[i] = 102 readb(module + offset + TC_MODULE + 4 * i); 103 } 104 tdev->firmware[8] = 0; 105 tdev->vendor[8] = 0; 106 tdev->name[8] = 0; 107 108 pr_info("%s: %s %s %s\n", dev_name(&tdev->dev), tdev->vendor, 109 tdev->name, tdev->firmware); 110 111 devsize = readb(module + offset + TC_SLOT_SIZE); 112 devsize <<= 22; 113 if (devsize <= slotsize) { 114 tdev->resource.start = slotaddr; 115 tdev->resource.end = slotaddr + devsize - 1; 116 } else if (devsize <= extslotsize) { 117 tdev->resource.start = extslotaddr; 118 tdev->resource.end = extslotaddr + devsize - 1; 119 } else { 120 printk(KERN_ERR "%s: Cannot provide slot space " 121 "(%dMiB required, up to %dMiB supported)\n", 122 dev_name(&tdev->dev), devsize >> 20, 123 max(slotsize, extslotsize) >> 20); 124 kfree(tdev); 125 goto out_err; 126 } 127 tdev->resource.name = tdev->name; 128 tdev->resource.flags = IORESOURCE_MEM; 129 130 tc_device_get_irq(tdev); 131 132 if (device_register(&tdev->dev)) { 133 put_device(&tdev->dev); 134 goto out_err; 135 } 136 list_add_tail(&tdev->node, &tbus->devices); 137 138 out_err: 139 iounmap(module); 140 } 141 } 142 143 /* 144 * The main entry. 145 */ 146 static int __init tc_init(void) 147 { 148 /* Initialize the TURBOchannel bus */ 149 if (tc_bus_get_info(&tc_bus)) 150 return 0; 151 152 INIT_LIST_HEAD(&tc_bus.devices); 153 dev_set_name(&tc_bus.dev, "tc"); 154 if (device_register(&tc_bus.dev)) { 155 put_device(&tc_bus.dev); 156 return 0; 157 } 158 159 if (tc_bus.info.slot_size) { 160 unsigned int tc_clock = tc_get_speed(&tc_bus) / 100000; 161 162 pr_info("tc: TURBOchannel rev. %d at %d.%d MHz " 163 "(with%s parity)\n", tc_bus.info.revision, 164 tc_clock / 10, tc_clock % 10, 165 tc_bus.info.parity ? "" : "out"); 166 167 tc_bus.resource[0].start = tc_bus.slot_base; 168 tc_bus.resource[0].end = tc_bus.slot_base + 169 (tc_bus.info.slot_size << 20) * 170 tc_bus.num_tcslots - 1; 171 tc_bus.resource[0].name = tc_bus.name; 172 tc_bus.resource[0].flags = IORESOURCE_MEM; 173 if (request_resource(&iomem_resource, 174 &tc_bus.resource[0]) < 0) { 175 printk(KERN_ERR "tc: Cannot reserve resource\n"); 176 return 0; 177 } 178 if (tc_bus.ext_slot_size) { 179 tc_bus.resource[1].start = tc_bus.ext_slot_base; 180 tc_bus.resource[1].end = tc_bus.ext_slot_base + 181 tc_bus.ext_slot_size * 182 tc_bus.num_tcslots - 1; 183 tc_bus.resource[1].name = tc_bus.name; 184 tc_bus.resource[1].flags = IORESOURCE_MEM; 185 if (request_resource(&iomem_resource, 186 &tc_bus.resource[1]) < 0) { 187 printk(KERN_ERR 188 "tc: Cannot reserve resource\n"); 189 release_resource(&tc_bus.resource[0]); 190 return 0; 191 } 192 } 193 194 tc_bus_add_devices(&tc_bus); 195 } 196 197 return 0; 198 } 199 200 subsys_initcall(tc_init); 201