431 lines
9.5 KiB
C
431 lines
9.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
#include <linux/export.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <asm/addrspace.h>
|
|
#include <asm/paccess.h>
|
|
#include <asm/gio_device.h>
|
|
#include <asm/sgi/gio.h>
|
|
#include <asm/sgi/hpc3.h>
|
|
#include <asm/sgi/mc.h>
|
|
#include <asm/sgi/ip22.h>
|
|
|
|
static struct bus_type gio_bus_type;
|
|
|
|
static struct {
|
|
const char *name;
|
|
__u8 id;
|
|
} gio_name_table[] = {
|
|
{ .name = "SGI Impact", .id = 0x10 },
|
|
{ .name = "Phobos G160", .id = 0x35 },
|
|
{ .name = "Phobos G130", .id = 0x36 },
|
|
{ .name = "Phobos G100", .id = 0x37 },
|
|
{ .name = "Set Engineering GFE", .id = 0x38 },
|
|
/* fake IDs */
|
|
{ .name = "SGI Newport", .id = 0x7e },
|
|
{ .name = "SGI GR2/GR3", .id = 0x7f },
|
|
};
|
|
|
|
static void gio_bus_release(struct device *dev)
|
|
{
|
|
kfree(dev);
|
|
}
|
|
|
|
static struct device gio_bus = {
|
|
.init_name = "gio",
|
|
.release = &gio_bus_release,
|
|
};
|
|
|
|
/**
|
|
* gio_match_device - Tell if an of_device structure has a matching
|
|
* gio_match structure
|
|
* @ids: array of of device match structures to search in
|
|
* @dev: the of device structure to match against
|
|
*
|
|
* Used by a driver to check whether an of_device present in the
|
|
* system is in its list of supported devices.
|
|
*/
|
|
static const struct gio_device_id *
|
|
gio_match_device(const struct gio_device_id *match,
|
|
const struct gio_device *dev)
|
|
{
|
|
const struct gio_device_id *ids;
|
|
|
|
for (ids = match; ids->id != 0xff; ids++)
|
|
if (ids->id == dev->id.id)
|
|
return ids;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
struct gio_device *gio_dev_get(struct gio_device *dev)
|
|
{
|
|
struct device *tmp;
|
|
|
|
if (!dev)
|
|
return NULL;
|
|
tmp = get_device(&dev->dev);
|
|
if (tmp)
|
|
return to_gio_device(tmp);
|
|
else
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gio_dev_get);
|
|
|
|
void gio_dev_put(struct gio_device *dev)
|
|
{
|
|
if (dev)
|
|
put_device(&dev->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gio_dev_put);
|
|
|
|
/**
|
|
* gio_release_dev - free an gio device structure when all users of it are finished.
|
|
* @dev: device that's been disconnected
|
|
*
|
|
* Will be called only by the device core when all users of this gio device are
|
|
* done.
|
|
*/
|
|
void gio_release_dev(struct device *dev)
|
|
{
|
|
struct gio_device *giodev;
|
|
|
|
giodev = to_gio_device(dev);
|
|
kfree(giodev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gio_release_dev);
|
|
|
|
int gio_device_register(struct gio_device *giodev)
|
|
{
|
|
giodev->dev.bus = &gio_bus_type;
|
|
giodev->dev.parent = &gio_bus;
|
|
return device_register(&giodev->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gio_device_register);
|
|
|
|
void gio_device_unregister(struct gio_device *giodev)
|
|
{
|
|
device_unregister(&giodev->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gio_device_unregister);
|
|
|
|
static int gio_bus_match(struct device *dev, struct device_driver *drv)
|
|
{
|
|
struct gio_device *gio_dev = to_gio_device(dev);
|
|
struct gio_driver *gio_drv = to_gio_driver(drv);
|
|
|
|
return gio_match_device(gio_drv->id_table, gio_dev) != NULL;
|
|
}
|
|
|
|
static int gio_device_probe(struct device *dev)
|
|
{
|
|
int error = -ENODEV;
|
|
struct gio_driver *drv;
|
|
struct gio_device *gio_dev;
|
|
const struct gio_device_id *match;
|
|
|
|
drv = to_gio_driver(dev->driver);
|
|
gio_dev = to_gio_device(dev);
|
|
|
|
if (!drv->probe)
|
|
return error;
|
|
|
|
gio_dev_get(gio_dev);
|
|
|
|
match = gio_match_device(drv->id_table, gio_dev);
|
|
if (match)
|
|
error = drv->probe(gio_dev, match);
|
|
if (error)
|
|
gio_dev_put(gio_dev);
|
|
|
|
return error;
|
|
}
|
|
|
|
static void gio_device_remove(struct device *dev)
|
|
{
|
|
struct gio_device *gio_dev = to_gio_device(dev);
|
|
struct gio_driver *drv = to_gio_driver(dev->driver);
|
|
|
|
if (dev->driver && drv->remove)
|
|
drv->remove(gio_dev);
|
|
}
|
|
|
|
static void gio_device_shutdown(struct device *dev)
|
|
{
|
|
struct gio_device *gio_dev = to_gio_device(dev);
|
|
struct gio_driver *drv = to_gio_driver(dev->driver);
|
|
|
|
if (dev->driver && drv->shutdown)
|
|
drv->shutdown(gio_dev);
|
|
}
|
|
|
|
static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct gio_device *gio_dev = to_gio_device(dev);
|
|
int len = snprintf(buf, PAGE_SIZE, "gio:%x\n", gio_dev->id.id);
|
|
|
|
return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
|
|
}
|
|
static DEVICE_ATTR_RO(modalias);
|
|
|
|
static ssize_t name_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct gio_device *giodev;
|
|
|
|
giodev = to_gio_device(dev);
|
|
return sprintf(buf, "%s", giodev->name);
|
|
}
|
|
static DEVICE_ATTR_RO(name);
|
|
|
|
static ssize_t id_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct gio_device *giodev;
|
|
|
|
giodev = to_gio_device(dev);
|
|
return sprintf(buf, "%x", giodev->id.id);
|
|
}
|
|
static DEVICE_ATTR_RO(id);
|
|
|
|
static struct attribute *gio_dev_attrs[] = {
|
|
&dev_attr_modalias.attr,
|
|
&dev_attr_name.attr,
|
|
&dev_attr_id.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(gio_dev);
|
|
|
|
static int gio_device_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
struct gio_device *gio_dev = to_gio_device(dev);
|
|
|
|
add_uevent_var(env, "MODALIAS=gio:%x", gio_dev->id.id);
|
|
return 0;
|
|
}
|
|
|
|
int gio_register_driver(struct gio_driver *drv)
|
|
{
|
|
/* initialize common driver fields */
|
|
if (!drv->driver.name)
|
|
drv->driver.name = drv->name;
|
|
if (!drv->driver.owner)
|
|
drv->driver.owner = drv->owner;
|
|
drv->driver.bus = &gio_bus_type;
|
|
|
|
/* register with core */
|
|
return driver_register(&drv->driver);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gio_register_driver);
|
|
|
|
void gio_unregister_driver(struct gio_driver *drv)
|
|
{
|
|
driver_unregister(&drv->driver);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gio_unregister_driver);
|
|
|
|
void gio_set_master(struct gio_device *dev)
|
|
{
|
|
u32 tmp = sgimc->giopar;
|
|
|
|
switch (dev->slotno) {
|
|
case 0:
|
|
tmp |= SGIMC_GIOPAR_MASTERGFX;
|
|
break;
|
|
case 1:
|
|
tmp |= SGIMC_GIOPAR_MASTEREXP0;
|
|
break;
|
|
case 2:
|
|
tmp |= SGIMC_GIOPAR_MASTEREXP1;
|
|
break;
|
|
}
|
|
sgimc->giopar = tmp;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gio_set_master);
|
|
|
|
void ip22_gio_set_64bit(int slotno)
|
|
{
|
|
u32 tmp = sgimc->giopar;
|
|
|
|
switch (slotno) {
|
|
case 0:
|
|
tmp |= SGIMC_GIOPAR_GFX64;
|
|
break;
|
|
case 1:
|
|
tmp |= SGIMC_GIOPAR_EXP064;
|
|
break;
|
|
case 2:
|
|
tmp |= SGIMC_GIOPAR_EXP164;
|
|
break;
|
|
}
|
|
sgimc->giopar = tmp;
|
|
}
|
|
|
|
static int ip22_gio_id(unsigned long addr, u32 *res)
|
|
{
|
|
u8 tmp8;
|
|
u8 tmp16;
|
|
u32 tmp32;
|
|
u8 *ptr8;
|
|
u16 *ptr16;
|
|
u32 *ptr32;
|
|
|
|
ptr32 = (void *)CKSEG1ADDR(addr);
|
|
if (!get_dbe(tmp32, ptr32)) {
|
|
/*
|
|
* We got no DBE, but this doesn't mean anything.
|
|
* If GIO is pipelined (which can't be disabled
|
|
* for GFX slot) we don't get a DBE, but we see
|
|
* the transfer size as data. So we do an 8bit
|
|
* and a 16bit access and check whether the common
|
|
* data matches
|
|
*/
|
|
ptr8 = (void *)CKSEG1ADDR(addr + 3);
|
|
if (get_dbe(tmp8, ptr8)) {
|
|
/*
|
|
* 32bit access worked, but 8bit doesn't
|
|
* so we don't see phantom reads on
|
|
* a pipelined bus, but a real card which
|
|
* doesn't support 8 bit reads
|
|
*/
|
|
*res = tmp32;
|
|
return 1;
|
|
}
|
|
ptr16 = (void *)CKSEG1ADDR(addr + 2);
|
|
get_dbe(tmp16, ptr16);
|
|
if (tmp8 == (tmp16 & 0xff) &&
|
|
tmp8 == (tmp32 & 0xff) &&
|
|
tmp16 == (tmp32 & 0xffff)) {
|
|
*res = tmp32;
|
|
return 1;
|
|
}
|
|
}
|
|
return 0; /* nothing here */
|
|
}
|
|
|
|
#define HQ2_MYSTERY_OFFS 0x6A07C
|
|
#define NEWPORT_USTATUS_OFFS 0xF133C
|
|
|
|
static int ip22_is_gr2(unsigned long addr)
|
|
{
|
|
u32 tmp;
|
|
u32 *ptr;
|
|
|
|
/* HQ2 only allows 32bit accesses */
|
|
ptr = (void *)CKSEG1ADDR(addr + HQ2_MYSTERY_OFFS);
|
|
if (!get_dbe(tmp, ptr)) {
|
|
if (tmp == 0xdeadbeef)
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void ip22_check_gio(int slotno, unsigned long addr, int irq)
|
|
{
|
|
const char *name = "Unknown";
|
|
struct gio_device *gio_dev;
|
|
u32 tmp;
|
|
__u8 id;
|
|
int i;
|
|
|
|
/* first look for GR2/GR3 by checking mystery register */
|
|
if (ip22_is_gr2(addr))
|
|
tmp = 0x7f;
|
|
else {
|
|
if (!ip22_gio_id(addr, &tmp)) {
|
|
/*
|
|
* no GIO signature at start address of slot
|
|
* since Newport doesn't have one, we check if
|
|
* user status register is readable
|
|
*/
|
|
if (ip22_gio_id(addr + NEWPORT_USTATUS_OFFS, &tmp))
|
|
tmp = 0x7e;
|
|
else
|
|
tmp = 0;
|
|
}
|
|
}
|
|
if (tmp) {
|
|
id = GIO_ID(tmp);
|
|
if (tmp & GIO_32BIT_ID) {
|
|
if (tmp & GIO_64BIT_IFACE)
|
|
ip22_gio_set_64bit(slotno);
|
|
}
|
|
for (i = 0; i < ARRAY_SIZE(gio_name_table); i++) {
|
|
if (id == gio_name_table[i].id) {
|
|
name = gio_name_table[i].name;
|
|
break;
|
|
}
|
|
}
|
|
printk(KERN_INFO "GIO: slot %d : %s (id %x)\n",
|
|
slotno, name, id);
|
|
gio_dev = kzalloc(sizeof *gio_dev, GFP_KERNEL);
|
|
gio_dev->name = name;
|
|
gio_dev->slotno = slotno;
|
|
gio_dev->id.id = id;
|
|
gio_dev->resource.start = addr;
|
|
gio_dev->resource.end = addr + 0x3fffff;
|
|
gio_dev->resource.flags = IORESOURCE_MEM;
|
|
gio_dev->irq = irq;
|
|
dev_set_name(&gio_dev->dev, "%d", slotno);
|
|
gio_device_register(gio_dev);
|
|
} else
|
|
printk(KERN_INFO "GIO: slot %d : Empty\n", slotno);
|
|
}
|
|
|
|
static struct bus_type gio_bus_type = {
|
|
.name = "gio",
|
|
.dev_groups = gio_dev_groups,
|
|
.match = gio_bus_match,
|
|
.probe = gio_device_probe,
|
|
.remove = gio_device_remove,
|
|
.shutdown = gio_device_shutdown,
|
|
.uevent = gio_device_uevent,
|
|
};
|
|
|
|
static struct resource gio_bus_resource = {
|
|
.start = GIO_SLOT_GFX_BASE,
|
|
.end = GIO_SLOT_GFX_BASE + 0x9fffff,
|
|
.name = "GIO Bus",
|
|
.flags = IORESOURCE_MEM,
|
|
};
|
|
|
|
int __init ip22_gio_init(void)
|
|
{
|
|
unsigned int pbdma __maybe_unused;
|
|
int ret;
|
|
|
|
ret = device_register(&gio_bus);
|
|
if (ret) {
|
|
put_device(&gio_bus);
|
|
return ret;
|
|
}
|
|
|
|
ret = bus_register(&gio_bus_type);
|
|
if (!ret) {
|
|
request_resource(&iomem_resource, &gio_bus_resource);
|
|
printk(KERN_INFO "GIO: Probing bus...\n");
|
|
|
|
if (ip22_is_fullhouse()) {
|
|
/* Indigo2 */
|
|
ip22_check_gio(0, GIO_SLOT_GFX_BASE, SGI_GIO_1_IRQ);
|
|
ip22_check_gio(1, GIO_SLOT_EXP0_BASE, SGI_GIO_1_IRQ);
|
|
} else {
|
|
/* Indy/Challenge S */
|
|
if (get_dbe(pbdma, (unsigned int *)&hpc3c1->pbdma[1]))
|
|
ip22_check_gio(0, GIO_SLOT_GFX_BASE,
|
|
SGI_GIO_0_IRQ);
|
|
ip22_check_gio(1, GIO_SLOT_EXP0_BASE, SGI_GIOEXP0_IRQ);
|
|
ip22_check_gio(2, GIO_SLOT_EXP1_BASE, SGI_GIOEXP1_IRQ);
|
|
}
|
|
} else
|
|
device_unregister(&gio_bus);
|
|
|
|
return ret;
|
|
}
|
|
|
|
subsys_initcall(ip22_gio_init);
|