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