1 /* 2 * Zorro Bus Services 3 * 4 * Copyright (C) 1995-2003 Geert Uytterhoeven 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file COPYING in the main directory of this archive 8 * for more details. 9 */ 10 11 #include <linux/module.h> 12 #include <linux/types.h> 13 #include <linux/kernel.h> 14 #include <linux/init.h> 15 #include <linux/zorro.h> 16 #include <linux/bitops.h> 17 #include <linux/string.h> 18 #include <linux/platform_device.h> 19 #include <linux/dma-mapping.h> 20 #include <linux/slab.h> 21 22 #include <asm/byteorder.h> 23 #include <asm/setup.h> 24 #include <asm/amigahw.h> 25 26 #include "zorro.h" 27 28 29 /* 30 * Zorro Expansion Devices 31 */ 32 33 unsigned int zorro_num_autocon; 34 struct zorro_dev_init zorro_autocon_init[ZORRO_NUM_AUTO] __initdata; 35 struct zorro_dev *zorro_autocon; 36 37 38 /* 39 * Zorro bus 40 */ 41 42 struct zorro_bus { 43 struct device dev; 44 struct zorro_dev devices[]; 45 }; 46 47 48 /* 49 * Find Zorro Devices 50 */ 51 52 struct zorro_dev *zorro_find_device(zorro_id id, struct zorro_dev *from) 53 { 54 struct zorro_dev *z; 55 56 if (!zorro_num_autocon) 57 return NULL; 58 59 for (z = from ? from+1 : &zorro_autocon[0]; 60 z < zorro_autocon+zorro_num_autocon; 61 z++) 62 if (id == ZORRO_WILDCARD || id == z->id) 63 return z; 64 return NULL; 65 } 66 EXPORT_SYMBOL(zorro_find_device); 67 68 69 /* 70 * Bitmask indicating portions of available Zorro II RAM that are unused 71 * by the system. Every bit represents a 64K chunk, for a maximum of 8MB 72 * (128 chunks, physical 0x00200000-0x009fffff). 73 * 74 * If you want to use (= allocate) portions of this RAM, you should clear 75 * the corresponding bits. 76 * 77 * Possible uses: 78 * - z2ram device 79 * - SCSI DMA bounce buffers 80 * 81 * FIXME: use the normal resource management 82 */ 83 84 DECLARE_BITMAP(zorro_unused_z2ram, 128); 85 EXPORT_SYMBOL(zorro_unused_z2ram); 86 87 88 static void __init mark_region(unsigned long start, unsigned long end, 89 int flag) 90 { 91 if (flag) 92 start += Z2RAM_CHUNKMASK; 93 else 94 end += Z2RAM_CHUNKMASK; 95 start &= ~Z2RAM_CHUNKMASK; 96 end &= ~Z2RAM_CHUNKMASK; 97 98 if (end <= Z2RAM_START || start >= Z2RAM_END) 99 return; 100 start = start < Z2RAM_START ? 0x00000000 : start-Z2RAM_START; 101 end = end > Z2RAM_END ? Z2RAM_SIZE : end-Z2RAM_START; 102 while (start < end) { 103 u32 chunk = start>>Z2RAM_CHUNKSHIFT; 104 105 if (flag) 106 set_bit(chunk, zorro_unused_z2ram); 107 else 108 clear_bit(chunk, zorro_unused_z2ram); 109 start += Z2RAM_CHUNKSIZE; 110 } 111 } 112 113 114 static struct resource __init *zorro_find_parent_resource( 115 struct platform_device *bridge, struct zorro_dev *z) 116 { 117 int i; 118 119 for (i = 0; i < bridge->num_resources; i++) { 120 if (resource_contains(&bridge->resource[i], &z->resource)) 121 return &bridge->resource[i]; 122 } 123 124 return &iomem_resource; 125 } 126 127 static int __init amiga_zorro_probe(struct platform_device *pdev) 128 { 129 struct zorro_bus *bus; 130 struct zorro_dev_init *zi; 131 struct zorro_dev *z; 132 struct resource *r; 133 unsigned int i; 134 int error; 135 136 /* Initialize the Zorro bus */ 137 bus = kzalloc(struct_size(bus, devices, zorro_num_autocon), 138 GFP_KERNEL); 139 if (!bus) 140 return -ENOMEM; 141 142 zorro_autocon = bus->devices; 143 bus->dev.parent = &pdev->dev; 144 dev_set_name(&bus->dev, zorro_bus_type.name); 145 error = device_register(&bus->dev); 146 if (error) { 147 pr_err("Zorro: Error registering zorro_bus\n"); 148 put_device(&bus->dev); 149 kfree(bus); 150 return error; 151 } 152 platform_set_drvdata(pdev, bus); 153 154 pr_info("Zorro: Probing AutoConfig expansion devices: %u device%s\n", 155 zorro_num_autocon, zorro_num_autocon == 1 ? "" : "s"); 156 157 /* First identify all devices ... */ 158 for (i = 0; i < zorro_num_autocon; i++) { 159 zi = &zorro_autocon_init[i]; 160 z = &zorro_autocon[i]; 161 162 z->rom = zi->rom; 163 z->id = (be16_to_cpu(z->rom.er_Manufacturer) << 16) | 164 (z->rom.er_Product << 8); 165 if (z->id == ZORRO_PROD_GVP_EPC_BASE) { 166 /* GVP quirk */ 167 unsigned long magic = zi->boardaddr + 0x8000; 168 169 z->id |= *(u16 *)ZTWO_VADDR(magic) & GVP_PRODMASK; 170 } 171 z->slotaddr = zi->slotaddr; 172 z->slotsize = zi->slotsize; 173 sprintf(z->name, "Zorro device %08x", z->id); 174 zorro_name_device(z); 175 z->resource = DEFINE_RES_MEM_NAMED(zi->boardaddr, zi->boardsize, z->name); 176 r = zorro_find_parent_resource(pdev, z); 177 error = request_resource(r, &z->resource); 178 if (error && !(z->rom.er_Type & ERTF_MEMLIST)) 179 dev_err(&bus->dev, 180 "Address space collision on device %s %pR\n", 181 z->name, &z->resource); 182 z->dev.parent = &bus->dev; 183 z->dev.bus = &zorro_bus_type; 184 z->dev.id = i; 185 switch (z->rom.er_Type & ERT_TYPEMASK) { 186 case ERT_ZORROIII: 187 z->dev.coherent_dma_mask = DMA_BIT_MASK(32); 188 break; 189 190 case ERT_ZORROII: 191 default: 192 z->dev.coherent_dma_mask = DMA_BIT_MASK(24); 193 break; 194 } 195 z->dev.dma_mask = &z->dev.coherent_dma_mask; 196 } 197 198 /* ... then register them */ 199 for (i = 0; i < zorro_num_autocon; i++) { 200 z = &zorro_autocon[i]; 201 error = device_register(&z->dev); 202 if (error) { 203 dev_err(&bus->dev, "Error registering device %s\n", 204 z->name); 205 put_device(&z->dev); 206 continue; 207 } 208 } 209 210 /* Mark all available Zorro II memory */ 211 zorro_for_each_dev(z) { 212 if (z->rom.er_Type & ERTF_MEMLIST) 213 mark_region(zorro_resource_start(z), 214 zorro_resource_end(z)+1, 1); 215 } 216 217 /* Unmark all used Zorro II memory */ 218 for (i = 0; i < m68k_num_memory; i++) 219 if (m68k_memory[i].addr < 16*1024*1024) 220 mark_region(m68k_memory[i].addr, 221 m68k_memory[i].addr+m68k_memory[i].size, 222 0); 223 224 return 0; 225 } 226 227 static struct platform_driver amiga_zorro_driver = { 228 .driver = { 229 .name = "amiga-zorro", 230 }, 231 }; 232 233 static int __init amiga_zorro_init(void) 234 { 235 return platform_driver_probe(&amiga_zorro_driver, amiga_zorro_probe); 236 } 237 238 module_init(amiga_zorro_init); 239 240 MODULE_LICENSE("GPL"); 241