1 #include <linux/export.h>
2 #include <linux/kernel.h>
3 #include <linux/init.h>
4 #include <linux/slab.h>
6 #include <asm/addrspace.h>
7 #include <asm/paccess.h>
8 #include <asm/gio_device.h>
9 #include <asm/sgi/gio.h>
10 #include <asm/sgi/hpc3.h>
11 #include <asm/sgi/mc.h>
12 #include <asm/sgi/ip22.h>
14 static struct bus_type gio_bus_type;
19 } gio_name_table[] = {
20 { .name = "SGI Impact", .id = 0x10 },
21 { .name = "Phobos G160", .id = 0x35 },
22 { .name = "Phobos G130", .id = 0x36 },
23 { .name = "Phobos G100", .id = 0x37 },
24 { .name = "Set Engineering GFE", .id = 0x38 },
26 { .name = "SGI Newport", .id = 0x7e },
27 { .name = "SGI GR2/GR3", .id = 0x7f },
30 static void gio_bus_release(struct device *dev)
35 static struct device gio_bus = {
37 .release = &gio_bus_release,
41 * gio_match_device - Tell if an of_device structure has a matching
43 * @ids: array of of device match structures to search in
44 * @dev: the of device structure to match against
46 * Used by a driver to check whether an of_device present in the
47 * system is in its list of supported devices.
49 const struct gio_device_id *gio_match_device(const struct gio_device_id *match,
50 const struct gio_device *dev)
52 const struct gio_device_id *ids;
54 for (ids = match; ids->id != 0xff; ids++)
55 if (ids->id == dev->id.id)
60 EXPORT_SYMBOL_GPL(gio_match_device);
62 struct gio_device *gio_dev_get(struct gio_device *dev)
68 tmp = get_device(&dev->dev);
70 return to_gio_device(tmp);
74 EXPORT_SYMBOL_GPL(gio_dev_get);
76 void gio_dev_put(struct gio_device *dev)
79 put_device(&dev->dev);
81 EXPORT_SYMBOL_GPL(gio_dev_put);
84 * gio_release_dev - free an gio device structure when all users of it are finished.
85 * @dev: device that's been disconnected
87 * Will be called only by the device core when all users of this gio device are
90 void gio_release_dev(struct device *dev)
92 struct gio_device *giodev;
94 giodev = to_gio_device(dev);
97 EXPORT_SYMBOL_GPL(gio_release_dev);
99 int gio_device_register(struct gio_device *giodev)
101 giodev->dev.bus = &gio_bus_type;
102 giodev->dev.parent = &gio_bus;
103 return device_register(&giodev->dev);
105 EXPORT_SYMBOL_GPL(gio_device_register);
107 void gio_device_unregister(struct gio_device *giodev)
109 device_unregister(&giodev->dev);
111 EXPORT_SYMBOL_GPL(gio_device_unregister);
113 static int gio_bus_match(struct device *dev, struct device_driver *drv)
115 struct gio_device *gio_dev = to_gio_device(dev);
116 struct gio_driver *gio_drv = to_gio_driver(drv);
118 return gio_match_device(gio_drv->id_table, gio_dev) != NULL;
121 static int gio_device_probe(struct device *dev)
124 struct gio_driver *drv;
125 struct gio_device *gio_dev;
126 const struct gio_device_id *match;
128 drv = to_gio_driver(dev->driver);
129 gio_dev = to_gio_device(dev);
134 gio_dev_get(gio_dev);
136 match = gio_match_device(drv->id_table, gio_dev);
138 error = drv->probe(gio_dev, match);
140 gio_dev_put(gio_dev);
145 static int gio_device_remove(struct device *dev)
147 struct gio_device *gio_dev = to_gio_device(dev);
148 struct gio_driver *drv = to_gio_driver(dev->driver);
150 if (dev->driver && drv->remove)
151 drv->remove(gio_dev);
155 static void gio_device_shutdown(struct device *dev)
157 struct gio_device *gio_dev = to_gio_device(dev);
158 struct gio_driver *drv = to_gio_driver(dev->driver);
160 if (dev->driver && drv->shutdown)
161 drv->shutdown(gio_dev);
164 static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
167 struct gio_device *gio_dev = to_gio_device(dev);
168 int len = snprintf(buf, PAGE_SIZE, "gio:%x\n", gio_dev->id.id);
170 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
172 static DEVICE_ATTR_RO(modalias);
174 static ssize_t name_show(struct device *dev,
175 struct device_attribute *attr, char *buf)
177 struct gio_device *giodev;
179 giodev = to_gio_device(dev);
180 return sprintf(buf, "%s", giodev->name);
182 static DEVICE_ATTR_RO(name);
184 static ssize_t id_show(struct device *dev,
185 struct device_attribute *attr, char *buf)
187 struct gio_device *giodev;
189 giodev = to_gio_device(dev);
190 return sprintf(buf, "%x", giodev->id.id);
192 static DEVICE_ATTR_RO(id);
194 static struct attribute *gio_dev_attrs[] = {
195 &dev_attr_modalias.attr,
200 ATTRIBUTE_GROUPS(gio_dev);
202 static int gio_device_uevent(struct device *dev, struct kobj_uevent_env *env)
204 struct gio_device *gio_dev = to_gio_device(dev);
206 add_uevent_var(env, "MODALIAS=gio:%x", gio_dev->id.id);
210 int gio_register_driver(struct gio_driver *drv)
212 /* initialize common driver fields */
213 if (!drv->driver.name)
214 drv->driver.name = drv->name;
215 if (!drv->driver.owner)
216 drv->driver.owner = drv->owner;
217 drv->driver.bus = &gio_bus_type;
219 /* register with core */
220 return driver_register(&drv->driver);
222 EXPORT_SYMBOL_GPL(gio_register_driver);
224 void gio_unregister_driver(struct gio_driver *drv)
226 driver_unregister(&drv->driver);
228 EXPORT_SYMBOL_GPL(gio_unregister_driver);
230 void gio_set_master(struct gio_device *dev)
232 u32 tmp = sgimc->giopar;
234 switch (dev->slotno) {
236 tmp |= SGIMC_GIOPAR_MASTERGFX;
239 tmp |= SGIMC_GIOPAR_MASTEREXP0;
242 tmp |= SGIMC_GIOPAR_MASTEREXP1;
247 EXPORT_SYMBOL_GPL(gio_set_master);
249 void ip22_gio_set_64bit(int slotno)
251 u32 tmp = sgimc->giopar;
255 tmp |= SGIMC_GIOPAR_GFX64;
258 tmp |= SGIMC_GIOPAR_EXP064;
261 tmp |= SGIMC_GIOPAR_EXP164;
267 static int ip22_gio_id(unsigned long addr, u32 *res)
276 ptr32 = (void *)CKSEG1ADDR(addr);
277 if (!get_dbe(tmp32, ptr32)) {
279 * We got no DBE, but this doesn't mean anything.
280 * If GIO is pipelined (which can't be disabled
281 * for GFX slot) we don't get a DBE, but we see
282 * the transfer size as data. So we do an 8bit
283 * and a 16bit access and check whether the common
286 ptr8 = (void *)CKSEG1ADDR(addr + 3);
287 if (get_dbe(tmp8, ptr8)) {
289 * 32bit access worked, but 8bit doesn't
290 * so we don't see phantom reads on
291 * a pipelined bus, but a real card which
292 * doesn't support 8 bit reads
297 ptr16 = (void *)CKSEG1ADDR(addr + 2);
298 get_dbe(tmp16, ptr16);
299 if (tmp8 == (tmp16 & 0xff) &&
300 tmp8 == (tmp32 & 0xff) &&
301 tmp16 == (tmp32 & 0xffff)) {
306 return 0; /* nothing here */
309 #define HQ2_MYSTERY_OFFS 0x6A07C
310 #define NEWPORT_USTATUS_OFFS 0xF133C
312 static int ip22_is_gr2(unsigned long addr)
317 /* HQ2 only allows 32bit accesses */
318 ptr = (void *)CKSEG1ADDR(addr + HQ2_MYSTERY_OFFS);
319 if (!get_dbe(tmp, ptr)) {
320 if (tmp == 0xdeadbeef)
327 static void ip22_check_gio(int slotno, unsigned long addr, int irq)
329 const char *name = "Unknown";
330 struct gio_device *gio_dev;
335 /* first look for GR2/GR3 by checking mystery register */
336 if (ip22_is_gr2(addr))
339 if (!ip22_gio_id(addr, &tmp)) {
341 * no GIO signature at start address of slot
342 * since Newport doesn't have one, we check if
343 * user status register is readable
345 if (ip22_gio_id(addr + NEWPORT_USTATUS_OFFS, &tmp))
353 if (tmp & GIO_32BIT_ID) {
354 if (tmp & GIO_64BIT_IFACE)
355 ip22_gio_set_64bit(slotno);
357 for (i = 0; i < ARRAY_SIZE(gio_name_table); i++) {
358 if (id == gio_name_table[i].id) {
359 name = gio_name_table[i].name;
363 printk(KERN_INFO "GIO: slot %d : %s (id %x)\n",
365 gio_dev = kzalloc(sizeof *gio_dev, GFP_KERNEL);
366 gio_dev->name = name;
367 gio_dev->slotno = slotno;
369 gio_dev->resource.start = addr;
370 gio_dev->resource.end = addr + 0x3fffff;
371 gio_dev->resource.flags = IORESOURCE_MEM;
373 dev_set_name(&gio_dev->dev, "%d", slotno);
374 gio_device_register(gio_dev);
376 printk(KERN_INFO "GIO: slot %d : Empty\n", slotno);
379 static struct bus_type gio_bus_type = {
381 .dev_groups = gio_dev_groups,
382 .match = gio_bus_match,
383 .probe = gio_device_probe,
384 .remove = gio_device_remove,
385 .shutdown = gio_device_shutdown,
386 .uevent = gio_device_uevent,
389 static struct resource gio_bus_resource = {
390 .start = GIO_SLOT_GFX_BASE,
391 .end = GIO_SLOT_GFX_BASE + 0x9fffff,
393 .flags = IORESOURCE_MEM,
396 int __init ip22_gio_init(void)
398 unsigned int pbdma __maybe_unused;
401 ret = device_register(&gio_bus);
403 put_device(&gio_bus);
407 ret = bus_register(&gio_bus_type);
409 request_resource(&iomem_resource, &gio_bus_resource);
410 printk(KERN_INFO "GIO: Probing bus...\n");
412 if (ip22_is_fullhouse()) {
414 ip22_check_gio(0, GIO_SLOT_GFX_BASE, SGI_GIO_1_IRQ);
415 ip22_check_gio(1, GIO_SLOT_EXP0_BASE, SGI_GIO_1_IRQ);
417 /* Indy/Challenge S */
418 if (get_dbe(pbdma, (unsigned int *)&hpc3c1->pbdma[1]))
419 ip22_check_gio(0, GIO_SLOT_GFX_BASE,
421 ip22_check_gio(1, GIO_SLOT_EXP0_BASE, SGI_GIOEXP0_IRQ);
422 ip22_check_gio(2, GIO_SLOT_EXP1_BASE, SGI_GIOEXP1_IRQ);
425 device_unregister(&gio_bus);
430 subsys_initcall(ip22_gio_init);