/*
* TURBOchannel bus services.
*
* Copyright (c) Harald Koerfgen, 1998
* Copyright (c) 2001, 2003, 2005, 2006, 2018 Maciej W. Rozycki
* Copyright (c) 2005 James Simmons
*
* 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/compiler.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/tc.h>
#include <linux/types.h>
#include <asm/io.h>
static struct tc_bus tc_bus = {
.name = "TURBOchannel",
};
/*
* Probing for TURBOchannel modules.
*/
static void __init tc_bus_add_devices(struct tc_bus *tbus)
{
resource_size_t slotsize = tbus->info.slot_size << 20;
resource_size_t extslotsize = tbus->ext_slot_size;
resource_size_t slotaddr;
resource_size_t extslotaddr;
resource_size_t devsize;
void __iomem *module;
struct tc_dev *tdev;
int i, slot, err;
u8 pattern[4];
long offset;
for (slot = 0; slot < tbus->num_tcslots; slot++) {
slotaddr = tbus->slot_base + slot * slotsize;
extslotaddr = tbus->ext_slot_base + slot * extslotsize;
module = ioremap(slotaddr, slotsize);
BUG_ON(!module);
offset = TC_OLDCARD;
err = 0;
err |= tc_preadb(pattern + 0, module + offset + TC_PATTERN0);
err |= tc_preadb(pattern + 1, module + offset + TC_PATTERN1);
err |= tc_preadb(pattern + 2, module + offset + TC_PATTERN2);
err |= tc_preadb(pattern + 3, module + offset + TC_PATTERN3);
if (err)
goto out_err;
if (pattern[0] != 0x55 || pattern[1] != 0x00 ||
pattern[2] != 0xaa || pattern[3] != 0xff) {
offset = TC_NEWCARD;
err = 0;
err |= tc_preadb(pattern + 0,
module + offset + TC_PATTERN0);
err |= tc_preadb(pattern + 1,
module + offset + TC_PATTERN1);
err |= tc_preadb(pattern + 2,
module + offset + TC_PATTERN2);
err |= tc_preadb(pattern + 3,
module + offset + TC_PATTERN3);
if (err)
goto out_err;
}
if (pattern[0] != 0x55 || pattern[1] != 0x00 ||
pattern[2] != 0xaa || pattern[3] != 0xff)
goto out_err;
/* Found a board, allocate it an entry in the list */
tdev = kzalloc(sizeof(*tdev), GFP_KERNEL);
if (!tdev) {
pr_err("tc%x: unable to allocate tc_dev\n", slot);
goto out_err;
}
dev_set_name(&tdev->dev, "tc%x", slot);
tdev->bus = tbus;
tdev->dev.parent = &tbus->dev;
tdev->dev.bus = &tc_bus_type;
tdev->slot = slot;
/* TURBOchannel has 34-bit DMA addressing (16GiB space). */
tdev->dma_mask = DMA_BIT_MASK(34);
tdev->dev.dma_mask = &tdev->dma_mask;
tdev->dev.coherent_dma_mask = DMA_BIT_MASK(34);
for (i = 0; i < 8; i++) {
tdev->firmware[i] =
readb(module + offset + TC_FIRM_VER + 4 * i);
tdev->vendor[i] =
readb(module + offset + TC_VENDOR + 4 * i);
tdev->name[i] =
readb(module + offset + TC_MODULE + 4 * i);
}
tdev->firmware[8] = 0;
tdev->vendor[8] = 0;
tdev->name[8] = 0;
pr_info("%s: %s %s %s\n", dev_name(&tdev->dev), tdev->vendor,
tdev->name, tdev->firmware);
devsize = readb(module + offset + TC_SLOT_SIZE);
devsize <<= 22;
if (devsize <= slotsize) {
tdev->resource.start = slotaddr;
tdev->resource.end = slotaddr + devsize - 1;
} else if (devsize <= extslotsize) {
tdev->resource.start = extslotaddr;
tdev->resource.end = extslotaddr + devsize - 1;
} else {
pr_err("%s: Cannot provide slot space "
"(%ldMiB required, up to %ldMiB supported)\n",
dev_name(&tdev->dev), (long)(devsize >> 20),
(long)(max(slotsize, extslotsize) >> 20));
kfree(tdev);
goto out_err;
}
tdev->resource.name = tdev->name;
tdev->resource.flags = IORESOURCE_MEM;
tc_device_get_irq(tdev);
if (device_register(&tdev->dev)) {
put_device(&tdev->dev);
goto out_err;
}
list_add_tail(&tdev->node, &tbus->devices);
out_err:
iounmap(module);
}
}
/*
* The main entry.
*/
static int __init tc_init(void)
{
/* Initialize the TURBOchannel bus */
if (tc_bus_get_info(&tc_bus))
goto out_err;
INIT_LIST_HEAD(&tc_bus.devices);
dev_set_name(&tc_bus.dev, "tc");
if (device_register(&tc_bus.dev))
goto out_err_device;
if (tc_bus.info.slot_size) {
unsigned int tc_clock = tc_get_speed(&tc_bus) / 100000;
pr_info("tc: TURBOchannel rev. %d at %d.%d MHz "
"(with%s parity)\n", tc_bus.info.revision,
tc_clock / 10, tc_clock % 10,
tc_bus.info.parity ? "" : "out");
tc_bus.resource[0].start = tc_bus.slot_base;
tc_bus.resource[0].end = tc_bus.slot_base +
(tc_bus.info.slot_size << 20) *
tc_bus.num_tcslots - 1;
tc_bus.resource[0].name = tc_bus.name;
tc_bus.resource[0].flags = IORESOURCE_MEM;
if (request_resource(&iomem_resource,
&tc_bus.resource[0]) < 0) {
pr_err("tc: Cannot reserve resource\n");
goto out_err_device;
}
if (tc_bus.ext_slot_size) {
tc_bus.resource[1].start = tc_bus.ext_slot_base;
tc_bus.resource[1].end = tc_bus.ext_slot_base +
tc_bus.ext_slot_size *
tc_bus.num_tcslots - 1;
tc_bus.resource[1].name = tc_bus.name;
tc_bus.resource[1].flags = IORESOURCE_MEM;
if (request_resource(&iomem_resource,
&tc_bus.resource[1]) < 0) {
pr_err("tc: Cannot reserve resource\n");
goto out_err_resource;
}
}
tc_bus_add_devices(&tc_bus);
}
return 0;
out_err_resource:
release_resource(&tc_bus.resource[0]);
out_err_device:
put_device(&tc_bus.dev);
out_err:
return 0;
}
subsys_initcall(tc_init);
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