diff options
Diffstat (limited to 'drivers/zorro/zorro.c')
| -rw-r--r-- | drivers/zorro/zorro.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/drivers/zorro/zorro.c b/drivers/zorro/zorro.c new file mode 100644 index 000000000000..d3c05dfe20d2 --- /dev/null +++ b/drivers/zorro/zorro.c @@ -0,0 +1,193 @@ +/* + * $Id: zorro.c,v 1.1.2.1 1998/06/07 23:21:02 geert Exp $ + * + * Zorro Bus Services + * + * Copyright (C) 1995-2003 Geert Uytterhoeven + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive + * for more details. + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/zorro.h> +#include <linux/bitops.h> +#include <asm/setup.h> +#include <asm/amigahw.h> + +#include "zorro.h" + + + /* + * Zorro Expansion Devices + */ + +u_int zorro_num_autocon = 0; +struct zorro_dev zorro_autocon[ZORRO_NUM_AUTO]; + + + /* + * Single Zorro bus + */ + +struct zorro_bus zorro_bus = {\ + .resources = { + /* Zorro II regions (on Zorro II/III) */ + { .name = "Zorro II exp", .start = 0x00e80000, .end = 0x00efffff }, + { .name = "Zorro II mem", .start = 0x00200000, .end = 0x009fffff }, + /* Zorro III regions (on Zorro III only) */ + { .name = "Zorro III exp", .start = 0xff000000, .end = 0xffffffff }, + { .name = "Zorro III cfg", .start = 0x40000000, .end = 0x7fffffff } + }, + .name = "Zorro bus" +}; + + + /* + * Find Zorro Devices + */ + +struct zorro_dev *zorro_find_device(zorro_id id, struct zorro_dev *from) +{ + struct zorro_dev *z; + + if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(ZORRO)) + return NULL; + + for (z = from ? from+1 : &zorro_autocon[0]; + z < zorro_autocon+zorro_num_autocon; + z++) + if (id == ZORRO_WILDCARD || id == z->id) + return z; + return NULL; +} + + + /* + * Bitmask indicating portions of available Zorro II RAM that are unused + * by the system. Every bit represents a 64K chunk, for a maximum of 8MB + * (128 chunks, physical 0x00200000-0x009fffff). + * + * If you want to use (= allocate) portions of this RAM, you should clear + * the corresponding bits. + * + * Possible uses: + * - z2ram device + * - SCSI DMA bounce buffers + * + * FIXME: use the normal resource management + */ + +DECLARE_BITMAP(zorro_unused_z2ram, 128); + + +static void __init mark_region(unsigned long start, unsigned long end, + int flag) +{ + if (flag) + start += Z2RAM_CHUNKMASK; + else + end += Z2RAM_CHUNKMASK; + start &= ~Z2RAM_CHUNKMASK; + end &= ~Z2RAM_CHUNKMASK; + + if (end <= Z2RAM_START || start >= Z2RAM_END) + return; + start = start < Z2RAM_START ? 0x00000000 : start-Z2RAM_START; + end = end > Z2RAM_END ? Z2RAM_SIZE : end-Z2RAM_START; + while (start < end) { + u32 chunk = start>>Z2RAM_CHUNKSHIFT; + if (flag) + set_bit(chunk, zorro_unused_z2ram); + else + clear_bit(chunk, zorro_unused_z2ram); + start += Z2RAM_CHUNKSIZE; + } +} + + +static struct resource __init *zorro_find_parent_resource(struct zorro_dev *z) +{ + int i; + + for (i = 0; i < zorro_bus.num_resources; i++) + if (zorro_resource_start(z) >= zorro_bus.resources[i].start && + zorro_resource_end(z) <= zorro_bus.resources[i].end) + return &zorro_bus.resources[i]; + return &iomem_resource; +} + + + /* + * Initialization + */ + +static int __init zorro_init(void) +{ + struct zorro_dev *z; + unsigned int i; + + if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(ZORRO)) + return 0; + + pr_info("Zorro: Probing AutoConfig expansion devices: %d device%s\n", + zorro_num_autocon, zorro_num_autocon == 1 ? "" : "s"); + + /* Initialize the Zorro bus */ + INIT_LIST_HEAD(&zorro_bus.devices); + strcpy(zorro_bus.dev.bus_id, "zorro"); + device_register(&zorro_bus.dev); + + /* Request the resources */ + zorro_bus.num_resources = AMIGAHW_PRESENT(ZORRO3) ? 4 : 2; + for (i = 0; i < zorro_bus.num_resources; i++) + request_resource(&iomem_resource, &zorro_bus.resources[i]); + + /* Register all devices */ + for (i = 0; i < zorro_num_autocon; i++) { + z = &zorro_autocon[i]; + z->id = (z->rom.er_Manufacturer<<16) | (z->rom.er_Product<<8); + if (z->id == ZORRO_PROD_GVP_EPC_BASE) { + /* GVP quirk */ + unsigned long magic = zorro_resource_start(z)+0x8000; + z->id |= *(u16 *)ZTWO_VADDR(magic) & GVP_PRODMASK; + } + sprintf(z->name, "Zorro device %08x", z->id); + zorro_name_device(z); + z->resource.name = z->name; + if (request_resource(zorro_find_parent_resource(z), &z->resource)) + printk(KERN_ERR "Zorro: Address space collision on device %s " + "[%lx:%lx]\n", + z->name, zorro_resource_start(z), zorro_resource_end(z)); + sprintf(z->dev.bus_id, "%02x", i); + z->dev.parent = &zorro_bus.dev; + z->dev.bus = &zorro_bus_type; + device_register(&z->dev); + zorro_create_sysfs_dev_files(z); + } + + /* Mark all available Zorro II memory */ + zorro_for_each_dev(z) { + if (z->rom.er_Type & ERTF_MEMLIST) + mark_region(zorro_resource_start(z), zorro_resource_end(z)+1, 1); + } + + /* Unmark all used Zorro II memory */ + for (i = 0; i < m68k_num_memory; i++) + if (m68k_memory[i].addr < 16*1024*1024) + mark_region(m68k_memory[i].addr, + m68k_memory[i].addr+m68k_memory[i].size, 0); + + return 0; +} + +subsys_initcall(zorro_init); + +EXPORT_SYMBOL(zorro_find_device); +EXPORT_SYMBOL(zorro_unused_z2ram); + +MODULE_LICENSE("GPL"); |