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08a64368 KM |
1 | /* |
2 | * HP Quicksilver AGP GART routines | |
3 | * | |
4 | * Copyright (c) 2006, Kyle McMartin <kyle@parisc-linux.org> | |
5 | * | |
6 | * Based on drivers/char/agpgart/hp-agp.c which is | |
7 | * (c) Copyright 2002, 2003 Hewlett-Packard Development Company, L.P. | |
8 | * Bjorn Helgaas <bjorn.helgaas@hp.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/pci.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/klist.h> | |
20 | #include <linux/agp_backend.h> | |
e57aa839 | 21 | #include <linux/log2.h> |
6a915c2b | 22 | #include <linux/slab.h> |
08a64368 | 23 | |
98f172b2 KM |
24 | #include <asm/parisc-device.h> |
25 | #include <asm/ropes.h> | |
08a64368 KM |
26 | |
27 | #include "agp.h" | |
28 | ||
29 | #define DRVNAME "quicksilver" | |
30 | #define DRVPFX DRVNAME ": " | |
31 | ||
08a64368 KM |
32 | #define AGP8X_MODE_BIT 3 |
33 | #define AGP8X_MODE (1 << AGP8X_MODE_BIT) | |
34 | ||
07613ba2 | 35 | static unsigned long |
2a4ceb6d | 36 | parisc_agp_mask_memory(struct agp_bridge_data *bridge, dma_addr_t addr, |
07613ba2 DA |
37 | int type); |
38 | ||
08a64368 KM |
39 | static struct _parisc_agp_info { |
40 | void __iomem *ioc_regs; | |
41 | void __iomem *lba_regs; | |
42 | ||
43 | int lba_cap_offset; | |
44 | ||
45 | u64 *gatt; | |
46 | u64 gatt_entries; | |
47 | ||
48 | u64 gart_base; | |
49 | u64 gart_size; | |
50 | ||
51 | int io_page_size; | |
52 | int io_pages_per_kpage; | |
53 | } parisc_agp_info; | |
54 | ||
55 | static struct gatt_mask parisc_agp_masks[] = | |
56 | { | |
57 | { | |
58 | .mask = SBA_PDIR_VALID_BIT, | |
59 | .type = 0 | |
60 | } | |
61 | }; | |
62 | ||
63 | static struct aper_size_info_fixed parisc_agp_sizes[] = | |
64 | { | |
65 | {0, 0, 0}, /* filled in by parisc_agp_fetch_size() */ | |
66 | }; | |
67 | ||
68 | static int | |
69 | parisc_agp_fetch_size(void) | |
70 | { | |
71 | int size; | |
72 | ||
73 | size = parisc_agp_info.gart_size / MB(1); | |
74 | parisc_agp_sizes[0].size = size; | |
75 | agp_bridge->current_size = (void *) &parisc_agp_sizes[0]; | |
76 | ||
77 | return size; | |
78 | } | |
79 | ||
80 | static int | |
81 | parisc_agp_configure(void) | |
82 | { | |
83 | struct _parisc_agp_info *info = &parisc_agp_info; | |
84 | ||
85 | agp_bridge->gart_bus_addr = info->gart_base; | |
86 | agp_bridge->capndx = info->lba_cap_offset; | |
87 | agp_bridge->mode = readl(info->lba_regs+info->lba_cap_offset+PCI_AGP_STATUS); | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
92 | static void | |
93 | parisc_agp_tlbflush(struct agp_memory *mem) | |
94 | { | |
95 | struct _parisc_agp_info *info = &parisc_agp_info; | |
96 | ||
e57aa839 | 97 | writeq(info->gart_base | ilog2(info->gart_size), info->ioc_regs+IOC_PCOM); |
08a64368 KM |
98 | readq(info->ioc_regs+IOC_PCOM); /* flush */ |
99 | } | |
100 | ||
101 | static int | |
102 | parisc_agp_create_gatt_table(struct agp_bridge_data *bridge) | |
103 | { | |
104 | struct _parisc_agp_info *info = &parisc_agp_info; | |
105 | int i; | |
106 | ||
107 | for (i = 0; i < info->gatt_entries; i++) { | |
108 | info->gatt[i] = (unsigned long)agp_bridge->scratch_page; | |
109 | } | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
114 | static int | |
115 | parisc_agp_free_gatt_table(struct agp_bridge_data *bridge) | |
116 | { | |
117 | struct _parisc_agp_info *info = &parisc_agp_info; | |
118 | ||
119 | info->gatt[0] = SBA_AGPGART_COOKIE; | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
124 | static int | |
125 | parisc_agp_insert_memory(struct agp_memory *mem, off_t pg_start, int type) | |
126 | { | |
127 | struct _parisc_agp_info *info = &parisc_agp_info; | |
128 | int i, k; | |
129 | off_t j, io_pg_start; | |
130 | int io_pg_count; | |
131 | ||
132 | if (type != 0 || mem->type != 0) { | |
133 | return -EINVAL; | |
134 | } | |
135 | ||
136 | io_pg_start = info->io_pages_per_kpage * pg_start; | |
137 | io_pg_count = info->io_pages_per_kpage * mem->page_count; | |
138 | if ((io_pg_start + io_pg_count) > info->gatt_entries) { | |
139 | return -EINVAL; | |
140 | } | |
141 | ||
142 | j = io_pg_start; | |
143 | while (j < (io_pg_start + io_pg_count)) { | |
144 | if (info->gatt[j]) | |
145 | return -EBUSY; | |
146 | j++; | |
147 | } | |
148 | ||
c7258012 | 149 | if (!mem->is_flushed) { |
08a64368 | 150 | global_cache_flush(); |
c7258012 | 151 | mem->is_flushed = true; |
08a64368 KM |
152 | } |
153 | ||
154 | for (i = 0, j = io_pg_start; i < mem->page_count; i++) { | |
155 | unsigned long paddr; | |
156 | ||
07613ba2 | 157 | paddr = page_to_phys(mem->pages[i]); |
08a64368 KM |
158 | for (k = 0; |
159 | k < info->io_pages_per_kpage; | |
160 | k++, j++, paddr += info->io_page_size) { | |
161 | info->gatt[j] = | |
07613ba2 | 162 | parisc_agp_mask_memory(agp_bridge, |
08a64368 KM |
163 | paddr, type); |
164 | } | |
165 | } | |
166 | ||
167 | agp_bridge->driver->tlb_flush(mem); | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
172 | static int | |
173 | parisc_agp_remove_memory(struct agp_memory *mem, off_t pg_start, int type) | |
174 | { | |
175 | struct _parisc_agp_info *info = &parisc_agp_info; | |
176 | int i, io_pg_start, io_pg_count; | |
177 | ||
178 | if (type != 0 || mem->type != 0) { | |
179 | return -EINVAL; | |
180 | } | |
181 | ||
182 | io_pg_start = info->io_pages_per_kpage * pg_start; | |
183 | io_pg_count = info->io_pages_per_kpage * mem->page_count; | |
184 | for (i = io_pg_start; i < io_pg_count + io_pg_start; i++) { | |
185 | info->gatt[i] = agp_bridge->scratch_page; | |
186 | } | |
187 | ||
188 | agp_bridge->driver->tlb_flush(mem); | |
189 | return 0; | |
190 | } | |
191 | ||
192 | static unsigned long | |
2a4ceb6d | 193 | parisc_agp_mask_memory(struct agp_bridge_data *bridge, dma_addr_t addr, |
07613ba2 DA |
194 | int type) |
195 | { | |
196 | return SBA_PDIR_VALID_BIT | addr; | |
197 | } | |
198 | ||
08a64368 KM |
199 | static void |
200 | parisc_agp_enable(struct agp_bridge_data *bridge, u32 mode) | |
201 | { | |
202 | struct _parisc_agp_info *info = &parisc_agp_info; | |
203 | u32 command; | |
204 | ||
205 | command = readl(info->lba_regs + info->lba_cap_offset + PCI_AGP_STATUS); | |
206 | ||
207 | command = agp_collect_device_status(bridge, mode, command); | |
208 | command |= 0x00000100; | |
209 | ||
210 | writel(command, info->lba_regs + info->lba_cap_offset + PCI_AGP_COMMAND); | |
211 | ||
212 | agp_device_command(command, (mode & AGP8X_MODE) != 0); | |
213 | } | |
214 | ||
fb55a0de | 215 | static const struct agp_bridge_driver parisc_agp_driver = { |
08a64368 KM |
216 | .owner = THIS_MODULE, |
217 | .size_type = FIXED_APER_SIZE, | |
218 | .configure = parisc_agp_configure, | |
219 | .fetch_size = parisc_agp_fetch_size, | |
220 | .tlb_flush = parisc_agp_tlbflush, | |
4ef8774c | 221 | .mask_memory = parisc_agp_mask_memory, |
08a64368 KM |
222 | .masks = parisc_agp_masks, |
223 | .agp_enable = parisc_agp_enable, | |
224 | .cache_flush = global_cache_flush, | |
225 | .create_gatt_table = parisc_agp_create_gatt_table, | |
226 | .free_gatt_table = parisc_agp_free_gatt_table, | |
227 | .insert_memory = parisc_agp_insert_memory, | |
228 | .remove_memory = parisc_agp_remove_memory, | |
229 | .alloc_by_type = agp_generic_alloc_by_type, | |
230 | .free_by_type = agp_generic_free_by_type, | |
231 | .agp_alloc_page = agp_generic_alloc_page, | |
5f310b63 | 232 | .agp_alloc_pages = agp_generic_alloc_pages, |
08a64368 | 233 | .agp_destroy_page = agp_generic_destroy_page, |
5f310b63 | 234 | .agp_destroy_pages = agp_generic_destroy_pages, |
bf1e5989 | 235 | .agp_type_to_mask_type = agp_generic_type_to_mask_type, |
c7258012 | 236 | .cant_use_aperture = true, |
08a64368 KM |
237 | }; |
238 | ||
239 | static int __init | |
240 | agp_ioc_init(void __iomem *ioc_regs) | |
241 | { | |
242 | struct _parisc_agp_info *info = &parisc_agp_info; | |
423c8ece | 243 | u64 iova_base, *io_pdir, io_tlb_ps; |
08a64368 KM |
244 | int io_tlb_shift; |
245 | ||
246 | printk(KERN_INFO DRVPFX "IO PDIR shared with sba_iommu\n"); | |
247 | ||
248 | info->ioc_regs = ioc_regs; | |
249 | ||
250 | io_tlb_ps = readq(info->ioc_regs+IOC_TCNFG); | |
251 | switch (io_tlb_ps) { | |
252 | case 0: io_tlb_shift = 12; break; | |
253 | case 1: io_tlb_shift = 13; break; | |
254 | case 2: io_tlb_shift = 14; break; | |
255 | case 3: io_tlb_shift = 16; break; | |
256 | default: | |
257 | printk(KERN_ERR DRVPFX "Invalid IOTLB page size " | |
258 | "configuration 0x%llx\n", io_tlb_ps); | |
259 | info->gatt = NULL; | |
260 | info->gatt_entries = 0; | |
261 | return -ENODEV; | |
262 | } | |
263 | info->io_page_size = 1 << io_tlb_shift; | |
264 | info->io_pages_per_kpage = PAGE_SIZE / info->io_page_size; | |
265 | ||
266 | iova_base = readq(info->ioc_regs+IOC_IBASE) & ~0x1; | |
267 | info->gart_base = iova_base + PLUTO_IOVA_SIZE - PLUTO_GART_SIZE; | |
268 | ||
269 | info->gart_size = PLUTO_GART_SIZE; | |
270 | info->gatt_entries = info->gart_size / info->io_page_size; | |
271 | ||
272 | io_pdir = phys_to_virt(readq(info->ioc_regs+IOC_PDIR_BASE)); | |
273 | info->gatt = &io_pdir[(PLUTO_IOVA_SIZE/2) >> PAGE_SHIFT]; | |
274 | ||
275 | if (info->gatt[0] != SBA_AGPGART_COOKIE) { | |
276 | info->gatt = NULL; | |
277 | info->gatt_entries = 0; | |
278 | printk(KERN_ERR DRVPFX "No reserved IO PDIR entry found; " | |
279 | "GART disabled\n"); | |
280 | return -ENODEV; | |
281 | } | |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
286 | static int | |
287 | lba_find_capability(int cap) | |
288 | { | |
289 | struct _parisc_agp_info *info = &parisc_agp_info; | |
290 | u16 status; | |
291 | u8 pos, id; | |
292 | int ttl = 48; | |
293 | ||
294 | status = readw(info->lba_regs + PCI_STATUS); | |
295 | if (!(status & PCI_STATUS_CAP_LIST)) | |
296 | return 0; | |
297 | pos = readb(info->lba_regs + PCI_CAPABILITY_LIST); | |
298 | while (ttl-- && pos >= 0x40) { | |
299 | pos &= ~3; | |
300 | id = readb(info->lba_regs + pos + PCI_CAP_LIST_ID); | |
301 | if (id == 0xff) | |
302 | break; | |
303 | if (id == cap) | |
304 | return pos; | |
305 | pos = readb(info->lba_regs + pos + PCI_CAP_LIST_NEXT); | |
306 | } | |
307 | return 0; | |
308 | } | |
309 | ||
310 | static int __init | |
311 | agp_lba_init(void __iomem *lba_hpa) | |
312 | { | |
313 | struct _parisc_agp_info *info = &parisc_agp_info; | |
314 | int cap; | |
315 | ||
316 | info->lba_regs = lba_hpa; | |
317 | info->lba_cap_offset = lba_find_capability(PCI_CAP_ID_AGP); | |
318 | ||
319 | cap = readl(lba_hpa + info->lba_cap_offset) & 0xff; | |
320 | if (cap != PCI_CAP_ID_AGP) { | |
321 | printk(KERN_ERR DRVPFX "Invalid capability ID 0x%02x at 0x%x\n", | |
322 | cap, info->lba_cap_offset); | |
323 | return -ENODEV; | |
324 | } | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
329 | static int __init | |
330 | parisc_agp_setup(void __iomem *ioc_hpa, void __iomem *lba_hpa) | |
331 | { | |
332 | struct pci_dev *fake_bridge_dev = NULL; | |
333 | struct agp_bridge_data *bridge; | |
334 | int error = 0; | |
335 | ||
8b1fce04 | 336 | fake_bridge_dev = pci_alloc_dev(NULL); |
08a64368 KM |
337 | if (!fake_bridge_dev) { |
338 | error = -ENOMEM; | |
339 | goto fail; | |
340 | } | |
341 | ||
342 | error = agp_ioc_init(ioc_hpa); | |
343 | if (error) | |
344 | goto fail; | |
345 | ||
346 | error = agp_lba_init(lba_hpa); | |
347 | if (error) | |
348 | goto fail; | |
349 | ||
350 | bridge = agp_alloc_bridge(); | |
351 | if (!bridge) { | |
352 | error = -ENOMEM; | |
353 | goto fail; | |
354 | } | |
355 | bridge->driver = &parisc_agp_driver; | |
356 | ||
357 | fake_bridge_dev->vendor = PCI_VENDOR_ID_HP; | |
358 | fake_bridge_dev->device = PCI_DEVICE_ID_HP_PCIX_LBA; | |
359 | bridge->dev = fake_bridge_dev; | |
360 | ||
361 | error = agp_add_bridge(bridge); | |
338e4fab JL |
362 | if (error) |
363 | goto fail; | |
364 | return 0; | |
08a64368 KM |
365 | |
366 | fail: | |
338e4fab | 367 | kfree(fake_bridge_dev); |
08a64368 KM |
368 | return error; |
369 | } | |
370 | ||
bfe4f4f8 JB |
371 | static int |
372 | find_quicksilver(struct device *dev, void *data) | |
373 | { | |
374 | struct parisc_device **lba = data; | |
375 | struct parisc_device *padev = to_parisc_device(dev); | |
376 | ||
377 | if (IS_QUICKSILVER(padev)) | |
378 | *lba = padev; | |
379 | ||
380 | return 0; | |
08a64368 KM |
381 | } |
382 | ||
383 | static int | |
384 | parisc_agp_init(void) | |
385 | { | |
386 | extern struct sba_device *sba_list; | |
387 | ||
388 | int err = -1; | |
389 | struct parisc_device *sba = NULL, *lba = NULL; | |
390 | struct lba_device *lbadev = NULL; | |
08a64368 KM |
391 | |
392 | if (!sba_list) | |
393 | goto out; | |
394 | ||
395 | /* Find our parent Pluto */ | |
396 | sba = sba_list->dev; | |
397 | if (!IS_PLUTO(sba)) { | |
398 | printk(KERN_INFO DRVPFX "No Pluto found, so no AGPGART for you.\n"); | |
399 | goto out; | |
400 | } | |
401 | ||
402 | /* Now search our Pluto for our precious AGP device... */ | |
bfe4f4f8 | 403 | device_for_each_child(&sba->dev, &lba, find_quicksilver); |
08a64368 KM |
404 | |
405 | if (!lba) { | |
406 | printk(KERN_INFO DRVPFX "No AGP devices found.\n"); | |
407 | goto out; | |
408 | } | |
409 | ||
410 | lbadev = parisc_get_drvdata(lba); | |
411 | ||
412 | /* w00t, let's go find our cookies... */ | |
413 | parisc_agp_setup(sba_list->ioc[0].ioc_hpa, lbadev->hba.base_addr); | |
414 | ||
415 | return 0; | |
416 | ||
417 | out: | |
418 | return err; | |
419 | } | |
420 | ||
421 | module_init(parisc_agp_init); | |
422 | ||
423 | MODULE_AUTHOR("Kyle McMartin <kyle@parisc-linux.org>"); | |
424 | MODULE_LICENSE("GPL"); |