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linux-next/drivers/zorro/zorro.c
Geert Uytterhoeven ea2abe2fd5 zorro: Fix address space collision message with RAM expansion boards
When booting Linux on an Amiga with BigRAMPlus Zorro expansion board:

    zorro: Address space collision on device Zorro device 12128600 (Individual Computers) [??? 0x50000000-]

This happens because the address space occupied by the BigRAMPlus Zorro
device is already in use, as it is part of system RAM.  Hence the
message is harmless.

Zorro memory expansion boards have the ERTF_MEMLIST flag set, which
tells AmigaOS to link the board's RAM into the free memory list.  While
we could skip registering the board resource if this flag is set, that
may cause issues with Zorro II RAM excluded in a memfile.

Hence fix the issue by just ignoring the error if ERTF_MEMLIST is set.

Reported-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/20200713072429.6182-1-geert@linux-m68k.org
2020-08-26 13:26:52 +02:00

247 lines
5.7 KiB
C

/*
* 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");