1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * HP Quicksilver AGP GART routines
4 *
5 * Copyright (c) 2006, Kyle McMartin <kyle@parisc-linux.org>
6 *
7 * Based on drivers/char/agpgart/hp-agp.c which is
8 * (c) Copyright 2002, 2003 Hewlett-Packard Development Company, L.P.
9 * Bjorn Helgaas <bjorn.helgaas@hp.com>
10 */
11
12 #include <linux/module.h>
13 #include <linux/pci.h>
14 #include <linux/init.h>
15 #include <linux/klist.h>
16 #include <linux/agp_backend.h>
17 #include <linux/log2.h>
18 #include <linux/slab.h>
19
20 #include <asm/parisc-device.h>
21 #include <asm/ropes.h>
22
23 #include "agp.h"
24
25 #define DRVNAME "quicksilver"
26 #define DRVPFX DRVNAME ": "
27
28 #define AGP8X_MODE_BIT 3
29 #define AGP8X_MODE (1 << AGP8X_MODE_BIT)
30
31 static unsigned long
32 parisc_agp_mask_memory(struct agp_bridge_data *bridge, dma_addr_t addr,
33 int type);
34
35 static struct _parisc_agp_info {
36 void __iomem *ioc_regs;
37 void __iomem *lba_regs;
38
39 int lba_cap_offset;
40
41 u64 *gatt;
42 u64 gatt_entries;
43
44 u64 gart_base;
45 u64 gart_size;
46
47 int io_page_size;
48 int io_pages_per_kpage;
49 } parisc_agp_info;
50
51 static struct gatt_mask parisc_agp_masks[] =
52 {
53 {
54 .mask = SBA_PDIR_VALID_BIT,
55 .type = 0
56 }
57 };
58
59 static struct aper_size_info_fixed parisc_agp_sizes[] =
60 {
61 {0, 0, 0}, /* filled in by parisc_agp_fetch_size() */
62 };
63
64 static int
parisc_agp_fetch_size(void)65 parisc_agp_fetch_size(void)
66 {
67 int size;
68
69 size = parisc_agp_info.gart_size / MB(1);
70 parisc_agp_sizes[0].size = size;
71 agp_bridge->current_size = (void *) &parisc_agp_sizes[0];
72
73 return size;
74 }
75
76 static int
parisc_agp_configure(void)77 parisc_agp_configure(void)
78 {
79 struct _parisc_agp_info *info = &parisc_agp_info;
80
81 agp_bridge->gart_bus_addr = info->gart_base;
82 agp_bridge->capndx = info->lba_cap_offset;
83 agp_bridge->mode = readl(info->lba_regs+info->lba_cap_offset+PCI_AGP_STATUS);
84
85 return 0;
86 }
87
88 static void
parisc_agp_tlbflush(struct agp_memory * mem)89 parisc_agp_tlbflush(struct agp_memory *mem)
90 {
91 struct _parisc_agp_info *info = &parisc_agp_info;
92
93 /* force fdc ops to be visible to IOMMU */
94 asm_io_sync();
95
96 writeq(info->gart_base | ilog2(info->gart_size), info->ioc_regs+IOC_PCOM);
97 readq(info->ioc_regs+IOC_PCOM); /* flush */
98 }
99
100 static int
parisc_agp_create_gatt_table(struct agp_bridge_data * bridge)101 parisc_agp_create_gatt_table(struct agp_bridge_data *bridge)
102 {
103 struct _parisc_agp_info *info = &parisc_agp_info;
104 int i;
105
106 for (i = 0; i < info->gatt_entries; i++) {
107 info->gatt[i] = (unsigned long)agp_bridge->scratch_page;
108 }
109
110 return 0;
111 }
112
113 static int
parisc_agp_free_gatt_table(struct agp_bridge_data * bridge)114 parisc_agp_free_gatt_table(struct agp_bridge_data *bridge)
115 {
116 struct _parisc_agp_info *info = &parisc_agp_info;
117
118 info->gatt[0] = SBA_AGPGART_COOKIE;
119
120 return 0;
121 }
122
123 static int
parisc_agp_insert_memory(struct agp_memory * mem,off_t pg_start,int type)124 parisc_agp_insert_memory(struct agp_memory *mem, off_t pg_start, int type)
125 {
126 struct _parisc_agp_info *info = &parisc_agp_info;
127 int i, k;
128 off_t j, io_pg_start;
129 int io_pg_count;
130
131 if (type != mem->type ||
132 agp_bridge->driver->agp_type_to_mask_type(agp_bridge, type)) {
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
149 if (!mem->is_flushed) {
150 global_cache_flush();
151 mem->is_flushed = true;
152 }
153
154 for (i = 0, j = io_pg_start; i < mem->page_count; i++) {
155 unsigned long paddr;
156
157 paddr = page_to_phys(mem->pages[i]);
158 for (k = 0;
159 k < info->io_pages_per_kpage;
160 k++, j++, paddr += info->io_page_size) {
161 info->gatt[j] =
162 parisc_agp_mask_memory(agp_bridge,
163 paddr, type);
164 asm_io_fdc(&info->gatt[j]);
165 }
166 }
167
168 agp_bridge->driver->tlb_flush(mem);
169
170 return 0;
171 }
172
173 static int
parisc_agp_remove_memory(struct agp_memory * mem,off_t pg_start,int type)174 parisc_agp_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
175 {
176 struct _parisc_agp_info *info = &parisc_agp_info;
177 int i, io_pg_start, io_pg_count;
178
179 if (type != mem->type ||
180 agp_bridge->driver->agp_type_to_mask_type(agp_bridge, type)) {
181 return -EINVAL;
182 }
183
184 io_pg_start = info->io_pages_per_kpage * pg_start;
185 io_pg_count = info->io_pages_per_kpage * mem->page_count;
186 for (i = io_pg_start; i < io_pg_count + io_pg_start; i++) {
187 info->gatt[i] = agp_bridge->scratch_page;
188 }
189
190 agp_bridge->driver->tlb_flush(mem);
191 return 0;
192 }
193
194 static unsigned long
parisc_agp_mask_memory(struct agp_bridge_data * bridge,dma_addr_t addr,int type)195 parisc_agp_mask_memory(struct agp_bridge_data *bridge, dma_addr_t addr,
196 int type)
197 {
198 unsigned ci; /* coherent index */
199 dma_addr_t pa;
200
201 pa = addr & IOVP_MASK;
202 asm("lci 0(%1), %0" : "=r" (ci) : "r" (phys_to_virt(pa)));
203
204 pa |= (ci >> PAGE_SHIFT) & 0xff;/* move CI (8 bits) into lowest byte */
205 pa |= SBA_PDIR_VALID_BIT; /* set "valid" bit */
206
207 return cpu_to_le64(pa);
208 }
209
210 static void
parisc_agp_enable(struct agp_bridge_data * bridge,u32 mode)211 parisc_agp_enable(struct agp_bridge_data *bridge, u32 mode)
212 {
213 struct _parisc_agp_info *info = &parisc_agp_info;
214 u32 command;
215
216 command = readl(info->lba_regs + info->lba_cap_offset + PCI_AGP_STATUS);
217
218 command = agp_collect_device_status(bridge, mode, command);
219 command |= 0x00000100;
220
221 writel(command, info->lba_regs + info->lba_cap_offset + PCI_AGP_COMMAND);
222
223 agp_device_command(command, (mode & AGP8X_MODE) != 0);
224 }
225
226 static const struct agp_bridge_driver parisc_agp_driver = {
227 .owner = THIS_MODULE,
228 .size_type = FIXED_APER_SIZE,
229 .configure = parisc_agp_configure,
230 .fetch_size = parisc_agp_fetch_size,
231 .tlb_flush = parisc_agp_tlbflush,
232 .mask_memory = parisc_agp_mask_memory,
233 .masks = parisc_agp_masks,
234 .agp_enable = parisc_agp_enable,
235 .cache_flush = global_cache_flush,
236 .create_gatt_table = parisc_agp_create_gatt_table,
237 .free_gatt_table = parisc_agp_free_gatt_table,
238 .insert_memory = parisc_agp_insert_memory,
239 .remove_memory = parisc_agp_remove_memory,
240 .alloc_by_type = agp_generic_alloc_by_type,
241 .free_by_type = agp_generic_free_by_type,
242 .agp_alloc_page = agp_generic_alloc_page,
243 .agp_alloc_pages = agp_generic_alloc_pages,
244 .agp_destroy_page = agp_generic_destroy_page,
245 .agp_destroy_pages = agp_generic_destroy_pages,
246 .agp_type_to_mask_type = agp_generic_type_to_mask_type,
247 .cant_use_aperture = true,
248 };
249
250 static int __init
agp_ioc_init(void __iomem * ioc_regs)251 agp_ioc_init(void __iomem *ioc_regs)
252 {
253 struct _parisc_agp_info *info = &parisc_agp_info;
254 u64 iova_base, *io_pdir, io_tlb_ps;
255 int io_tlb_shift;
256
257 printk(KERN_INFO DRVPFX "IO PDIR shared with sba_iommu\n");
258
259 info->ioc_regs = ioc_regs;
260
261 io_tlb_ps = readq(info->ioc_regs+IOC_TCNFG);
262 switch (io_tlb_ps) {
263 case 0: io_tlb_shift = 12; break;
264 case 1: io_tlb_shift = 13; break;
265 case 2: io_tlb_shift = 14; break;
266 case 3: io_tlb_shift = 16; break;
267 default:
268 printk(KERN_ERR DRVPFX "Invalid IOTLB page size "
269 "configuration 0x%llx\n", io_tlb_ps);
270 info->gatt = NULL;
271 info->gatt_entries = 0;
272 return -ENODEV;
273 }
274 info->io_page_size = 1 << io_tlb_shift;
275 info->io_pages_per_kpage = PAGE_SIZE / info->io_page_size;
276
277 iova_base = readq(info->ioc_regs+IOC_IBASE) & ~0x1;
278 info->gart_base = iova_base + PLUTO_IOVA_SIZE - PLUTO_GART_SIZE;
279
280 info->gart_size = PLUTO_GART_SIZE;
281 info->gatt_entries = info->gart_size / info->io_page_size;
282
283 io_pdir = phys_to_virt(readq(info->ioc_regs+IOC_PDIR_BASE));
284 info->gatt = &io_pdir[(PLUTO_IOVA_SIZE/2) >> PAGE_SHIFT];
285
286 if (info->gatt[0] != SBA_AGPGART_COOKIE) {
287 info->gatt = NULL;
288 info->gatt_entries = 0;
289 printk(KERN_ERR DRVPFX "No reserved IO PDIR entry found; "
290 "GART disabled\n");
291 return -ENODEV;
292 }
293
294 return 0;
295 }
296
297 static int __init
lba_find_capability(int cap)298 lba_find_capability(int cap)
299 {
300 struct _parisc_agp_info *info = &parisc_agp_info;
301 u16 status;
302 u8 pos, id;
303 int ttl = 48;
304
305 status = readw(info->lba_regs + PCI_STATUS);
306 if (!(status & PCI_STATUS_CAP_LIST))
307 return 0;
308 pos = readb(info->lba_regs + PCI_CAPABILITY_LIST);
309 while (ttl-- && pos >= 0x40) {
310 pos &= ~3;
311 id = readb(info->lba_regs + pos + PCI_CAP_LIST_ID);
312 if (id == 0xff)
313 break;
314 if (id == cap)
315 return pos;
316 pos = readb(info->lba_regs + pos + PCI_CAP_LIST_NEXT);
317 }
318 return 0;
319 }
320
321 static int __init
agp_lba_init(void __iomem * lba_hpa)322 agp_lba_init(void __iomem *lba_hpa)
323 {
324 struct _parisc_agp_info *info = &parisc_agp_info;
325 int cap;
326
327 info->lba_regs = lba_hpa;
328 info->lba_cap_offset = lba_find_capability(PCI_CAP_ID_AGP);
329
330 cap = readl(lba_hpa + info->lba_cap_offset) & 0xff;
331 if (cap != PCI_CAP_ID_AGP) {
332 printk(KERN_ERR DRVPFX "Invalid capability ID 0x%02x at 0x%x\n",
333 cap, info->lba_cap_offset);
334 return -ENODEV;
335 }
336
337 return 0;
338 }
339
340 static int __init
parisc_agp_setup(void __iomem * ioc_hpa,void __iomem * lba_hpa)341 parisc_agp_setup(void __iomem *ioc_hpa, void __iomem *lba_hpa)
342 {
343 struct pci_dev *fake_bridge_dev = NULL;
344 struct agp_bridge_data *bridge;
345 int error = 0;
346
347 fake_bridge_dev = pci_alloc_dev(NULL);
348 if (!fake_bridge_dev) {
349 error = -ENOMEM;
350 goto fail;
351 }
352
353 error = agp_ioc_init(ioc_hpa);
354 if (error)
355 goto fail;
356
357 error = agp_lba_init(lba_hpa);
358 if (error)
359 goto fail;
360
361 bridge = agp_alloc_bridge();
362 if (!bridge) {
363 error = -ENOMEM;
364 goto fail;
365 }
366 bridge->driver = &parisc_agp_driver;
367
368 fake_bridge_dev->vendor = PCI_VENDOR_ID_HP;
369 fake_bridge_dev->device = PCI_DEVICE_ID_HP_PCIX_LBA;
370 bridge->dev = fake_bridge_dev;
371
372 error = agp_add_bridge(bridge);
373 if (error)
374 goto fail;
375 return 0;
376
377 fail:
378 kfree(fake_bridge_dev);
379 return error;
380 }
381
382 static int __init
find_quicksilver(struct device * dev,void * data)383 find_quicksilver(struct device *dev, void *data)
384 {
385 struct parisc_device **lba = data;
386 struct parisc_device *padev = to_parisc_device(dev);
387
388 if (IS_QUICKSILVER(padev))
389 *lba = padev;
390
391 return 0;
392 }
393
394 static int __init
parisc_agp_init(void)395 parisc_agp_init(void)
396 {
397 int err = -1;
398 struct parisc_device *sba = NULL, *lba = NULL;
399 struct lba_device *lbadev = NULL;
400
401 if (!sba_list)
402 goto out;
403
404 /* Find our parent Pluto */
405 sba = sba_list->dev;
406 if (!IS_PLUTO(sba)) {
407 printk(KERN_INFO DRVPFX "No Pluto found, so no AGPGART for you.\n");
408 goto out;
409 }
410
411 /* Now search our Pluto for our precious AGP device... */
412 device_for_each_child(&sba->dev, &lba, find_quicksilver);
413
414 if (!lba) {
415 printk(KERN_INFO DRVPFX "No AGP devices found.\n");
416 goto out;
417 }
418
419 lbadev = parisc_get_drvdata(lba);
420
421 /* w00t, let's go find our cookies... */
422 parisc_agp_setup(sba_list->ioc[0].ioc_hpa, lbadev->hba.base_addr);
423
424 return 0;
425
426 out:
427 return err;
428 }
429
430 module_init(parisc_agp_init);
431
432 MODULE_AUTHOR("Kyle McMartin <kyle@parisc-linux.org>");
433 MODULE_LICENSE("GPL");
434
