242 lines · c
1/*2 * Zorro Bus Services3 *4 * Copyright (C) 1995-2003 Geert Uytterhoeven5 *6 * This file is subject to the terms and conditions of the GNU General Public7 * License. See the file COPYING in the main directory of this archive8 * 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#include <linux/string_choices.h>22 23#include <asm/byteorder.h>24#include <asm/setup.h>25#include <asm/amigahw.h>26 27#include "zorro.h"28 29 30 /*31 * Zorro Expansion Devices32 */33 34unsigned int zorro_num_autocon;35struct zorro_dev_init zorro_autocon_init[ZORRO_NUM_AUTO] __initdata;36struct zorro_dev *zorro_autocon;37 38 39 /*40 * Zorro bus41 */42 43struct zorro_bus {44 struct device dev;45 struct zorro_dev devices[];46};47 48 49 /*50 * Find Zorro Devices51 */52 53struct zorro_dev *zorro_find_device(zorro_id id, struct zorro_dev *from)54{55 struct zorro_dev *z;56 57 if (!zorro_num_autocon)58 return NULL;59 60 for (z = from ? from+1 : &zorro_autocon[0];61 z < zorro_autocon+zorro_num_autocon;62 z++)63 if (id == ZORRO_WILDCARD || id == z->id)64 return z;65 return NULL;66}67EXPORT_SYMBOL(zorro_find_device);68 69 70 /*71 * Bitmask indicating portions of available Zorro II RAM that are unused72 * by the system. Every bit represents a 64K chunk, for a maximum of 8MB73 * (128 chunks, physical 0x00200000-0x009fffff).74 *75 * If you want to use (= allocate) portions of this RAM, you should clear76 * the corresponding bits.77 *78 * Possible uses:79 * - z2ram device80 * - SCSI DMA bounce buffers81 *82 * FIXME: use the normal resource management83 */84 85DECLARE_BITMAP(zorro_unused_z2ram, 128);86EXPORT_SYMBOL(zorro_unused_z2ram);87 88 89static void __init mark_region(unsigned long start, unsigned long end,90 int flag)91{92 if (flag)93 start += Z2RAM_CHUNKMASK;94 else95 end += Z2RAM_CHUNKMASK;96 start &= ~Z2RAM_CHUNKMASK;97 end &= ~Z2RAM_CHUNKMASK;98 99 if (end <= Z2RAM_START || start >= Z2RAM_END)100 return;101 start = start < Z2RAM_START ? 0x00000000 : start-Z2RAM_START;102 end = end > Z2RAM_END ? Z2RAM_SIZE : end-Z2RAM_START;103 while (start < end) {104 u32 chunk = start>>Z2RAM_CHUNKSHIFT;105 106 if (flag)107 set_bit(chunk, zorro_unused_z2ram);108 else109 clear_bit(chunk, zorro_unused_z2ram);110 start += Z2RAM_CHUNKSIZE;111 }112}113 114 115static struct resource __init *zorro_find_parent_resource(116 struct platform_device *bridge, struct zorro_dev *z)117{118 int i;119 120 for (i = 0; i < bridge->num_resources; i++) {121 if (resource_contains(&bridge->resource[i], &z->resource))122 return &bridge->resource[i];123 }124 125 return &iomem_resource;126}127 128static int __init amiga_zorro_probe(struct platform_device *pdev)129{130 struct zorro_bus *bus;131 struct zorro_dev_init *zi;132 struct zorro_dev *z;133 struct resource *r;134 unsigned int i;135 int error;136 137 /* Initialize the Zorro bus */138 bus = kzalloc(struct_size(bus, devices, zorro_num_autocon),139 GFP_KERNEL);140 if (!bus)141 return -ENOMEM;142 143 zorro_autocon = bus->devices;144 bus->dev.parent = &pdev->dev;145 dev_set_name(&bus->dev, zorro_bus_type.name);146 error = device_register(&bus->dev);147 if (error) {148 pr_err("Zorro: Error registering zorro_bus\n");149 put_device(&bus->dev);150 kfree(bus);151 return error;152 }153 platform_set_drvdata(pdev, bus);154 155 pr_info("Zorro: Probing AutoConfig expansion devices: %u device%s\n",156 zorro_num_autocon, str_plural(zorro_num_autocon));157 158 /* First identify all devices ... */159 for (i = 0; i < zorro_num_autocon; i++) {160 zi = &zorro_autocon_init[i];161 z = &zorro_autocon[i];162 163 z->rom = zi->rom;164 z->id = (be16_to_cpu(z->rom.er_Manufacturer) << 16) |165 (z->rom.er_Product << 8);166 if (z->id == ZORRO_PROD_GVP_EPC_BASE) {167 /* GVP quirk */168 unsigned long magic = zi->boardaddr + 0x8000;169 170 z->id |= *(u16 *)ZTWO_VADDR(magic) & GVP_PRODMASK;171 }172 z->slotaddr = zi->slotaddr;173 z->slotsize = zi->slotsize;174 sprintf(z->name, "Zorro device %08x", z->id);175 zorro_name_device(z);176 z->resource = DEFINE_RES_MEM_NAMED(zi->boardaddr, zi->boardsize, z->name);177 r = zorro_find_parent_resource(pdev, z);178 error = request_resource(r, &z->resource);179 if (error && !(z->rom.er_Type & ERTF_MEMLIST))180 dev_err(&bus->dev,181 "Address space collision on device %s %pR\n",182 z->name, &z->resource);183 z->dev.parent = &bus->dev;184 z->dev.bus = &zorro_bus_type;185 z->dev.id = i;186 switch (z->rom.er_Type & ERT_TYPEMASK) {187 case ERT_ZORROIII:188 z->dev.coherent_dma_mask = DMA_BIT_MASK(32);189 break;190 191 case ERT_ZORROII:192 default:193 z->dev.coherent_dma_mask = DMA_BIT_MASK(24);194 break;195 }196 z->dev.dma_mask = &z->dev.coherent_dma_mask;197 }198 199 /* ... then register them */200 for (i = 0; i < zorro_num_autocon; i++) {201 z = &zorro_autocon[i];202 error = device_register(&z->dev);203 if (error) {204 dev_err(&bus->dev, "Error registering device %s\n",205 z->name);206 put_device(&z->dev);207 continue;208 }209 }210 211 /* Mark all available Zorro II memory */212 zorro_for_each_dev(z) {213 if (z->rom.er_Type & ERTF_MEMLIST)214 mark_region(zorro_resource_start(z),215 zorro_resource_end(z)+1, 1);216 }217 218 /* Unmark all used Zorro II memory */219 for (i = 0; i < m68k_num_memory; i++)220 if (m68k_memory[i].addr < 16*1024*1024)221 mark_region(m68k_memory[i].addr,222 m68k_memory[i].addr+m68k_memory[i].size,223 0);224 225 return 0;226}227 228static struct platform_driver amiga_zorro_driver = {229 .driver = {230 .name = "amiga-zorro",231 },232};233 234static int __init amiga_zorro_init(void)235{236 return platform_driver_probe(&amiga_zorro_driver, amiga_zorro_probe);237}238 239module_init(amiga_zorro_init);240 241MODULE_LICENSE("GPL");242