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// 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 int 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);
return 0;
}
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
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