diff options
Diffstat (limited to 'drivers/zorro/zorro.c')
| -rw-r--r-- | drivers/zorro/zorro.c | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/drivers/zorro/zorro.c b/drivers/zorro/zorro.c new file mode 100644 index 000000000..1b9928648 --- /dev/null +++ b/drivers/zorro/zorro.c @@ -0,0 +1,246 @@ +/* + * 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 <linux/string.h> +#include <linux/platform_device.h> +#include <linux/dma-mapping.h> +#include <linux/slab.h> + +#include <asm/byteorder.h> +#include <asm/setup.h> +#include <asm/amigahw.h> + +#include "zorro.h" + + + /* + * Zorro Expansion Devices + */ + +unsigned int zorro_num_autocon; +struct zorro_dev_init zorro_autocon_init[ZORRO_NUM_AUTO] __initdata; +struct zorro_dev *zorro_autocon; + + + /* + * Zorro bus + */ + +struct zorro_bus { + struct device dev; + struct zorro_dev devices[]; +}; + + + /* + * Find Zorro Devices + */ + +struct zorro_dev *zorro_find_device(zorro_id id, struct zorro_dev *from) +{ + struct zorro_dev *z; + + if (!zorro_num_autocon) + 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; +} +EXPORT_SYMBOL(zorro_find_device); + + + /* + * 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); +EXPORT_SYMBOL(zorro_unused_z2ram); + + +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 platform_device *bridge, struct zorro_dev *z) +{ + int i; + + for (i = 0; i < bridge->num_resources; i++) { + struct resource *r = &bridge->resource[i]; + + if (zorro_resource_start(z) >= r->start && + zorro_resource_end(z) <= r->end) + return r; + } + return &iomem_resource; +} + + + +static int __init amiga_zorro_probe(struct platform_device *pdev) +{ + struct zorro_bus *bus; + struct zorro_dev_init *zi; + struct zorro_dev *z; + struct resource *r; + unsigned int i; + int error; + + /* Initialize the Zorro bus */ + bus = kzalloc(struct_size(bus, devices, zorro_num_autocon), + GFP_KERNEL); + if (!bus) + return -ENOMEM; + + zorro_autocon = bus->devices; + bus->dev.parent = &pdev->dev; + dev_set_name(&bus->dev, zorro_bus_type.name); + error = device_register(&bus->dev); + if (error) { + pr_err("Zorro: Error registering zorro_bus\n"); + put_device(&bus->dev); + kfree(bus); + return error; + } + platform_set_drvdata(pdev, bus); + + pr_info("Zorro: Probing AutoConfig expansion devices: %u device%s\n", + zorro_num_autocon, zorro_num_autocon == 1 ? "" : "s"); + + /* First identify all devices ... */ + for (i = 0; i < zorro_num_autocon; i++) { + zi = &zorro_autocon_init[i]; + z = &zorro_autocon[i]; + + z->rom = zi->rom; + z->id = (be16_to_cpu(z->rom.er_Manufacturer) << 16) | + (z->rom.er_Product << 8); + if (z->id == ZORRO_PROD_GVP_EPC_BASE) { + /* GVP quirk */ + unsigned long magic = zi->boardaddr + 0x8000; + + z->id |= *(u16 *)ZTWO_VADDR(magic) & GVP_PRODMASK; + } + z->slotaddr = zi->slotaddr; + z->slotsize = zi->slotsize; + sprintf(z->name, "Zorro device %08x", z->id); + zorro_name_device(z); + z->resource.start = zi->boardaddr; + z->resource.end = zi->boardaddr + zi->boardsize - 1; + z->resource.name = z->name; + r = zorro_find_parent_resource(pdev, z); + error = request_resource(r, &z->resource); + if (error && !(z->rom.er_Type & ERTF_MEMLIST)) + dev_err(&bus->dev, + "Address space collision on device %s %pR\n", + z->name, &z->resource); + z->dev.parent = &bus->dev; + z->dev.bus = &zorro_bus_type; + z->dev.id = i; + switch (z->rom.er_Type & ERT_TYPEMASK) { + case ERT_ZORROIII: + z->dev.coherent_dma_mask = DMA_BIT_MASK(32); + break; + + case ERT_ZORROII: + default: + z->dev.coherent_dma_mask = DMA_BIT_MASK(24); + break; + } + z->dev.dma_mask = &z->dev.coherent_dma_mask; + } + + /* ... then register them */ + for (i = 0; i < zorro_num_autocon; i++) { + z = &zorro_autocon[i]; + error = device_register(&z->dev); + if (error) { + dev_err(&bus->dev, "Error registering device %s\n", + z->name); + put_device(&z->dev); + continue; + } + } + + /* 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; +} + +static struct platform_driver amiga_zorro_driver = { + .driver = { + .name = "amiga-zorro", + }, +}; + +static int __init amiga_zorro_init(void) +{ + return platform_driver_probe(&amiga_zorro_driver, amiga_zorro_probe); +} + +module_init(amiga_zorro_init); + +MODULE_LICENSE("GPL"); |