2 * HP Quicksilver AGP GART routines
4 * Copyright (c) 2006, Kyle McMartin <kyle@parisc-linux.org>
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>
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.
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>
22 #include <asm-parisc/parisc-device.h>
23 #include <asm-parisc/ropes.h>
27 #define DRVNAME "quicksilver"
28 #define DRVPFX DRVNAME ": "
31 #define log2(x) ffz(~(x))
34 #define AGP8X_MODE_BIT 3
35 #define AGP8X_MODE (1 << AGP8X_MODE_BIT)
37 static struct _parisc_agp_info {
38 void __iomem *ioc_regs;
39 void __iomem *lba_regs;
50 int io_pages_per_kpage;
53 static struct gatt_mask parisc_agp_masks[] =
56 .mask = SBA_PDIR_VALID_BIT,
61 static struct aper_size_info_fixed parisc_agp_sizes[] =
63 {0, 0, 0}, /* filled in by parisc_agp_fetch_size() */
67 parisc_agp_fetch_size(void)
71 size = parisc_agp_info.gart_size / MB(1);
72 parisc_agp_sizes[0].size = size;
73 agp_bridge->current_size = (void *) &parisc_agp_sizes[0];
79 parisc_agp_configure(void)
81 struct _parisc_agp_info *info = &parisc_agp_info;
83 agp_bridge->gart_bus_addr = info->gart_base;
84 agp_bridge->capndx = info->lba_cap_offset;
85 agp_bridge->mode = readl(info->lba_regs+info->lba_cap_offset+PCI_AGP_STATUS);
91 parisc_agp_tlbflush(struct agp_memory *mem)
93 struct _parisc_agp_info *info = &parisc_agp_info;
95 writeq(info->gart_base | log2(info->gart_size), info->ioc_regs+IOC_PCOM);
96 readq(info->ioc_regs+IOC_PCOM); /* flush */
100 parisc_agp_create_gatt_table(struct agp_bridge_data *bridge)
102 struct _parisc_agp_info *info = &parisc_agp_info;
105 for (i = 0; i < info->gatt_entries; i++) {
106 info->gatt[i] = (unsigned long)agp_bridge->scratch_page;
113 parisc_agp_free_gatt_table(struct agp_bridge_data *bridge)
115 struct _parisc_agp_info *info = &parisc_agp_info;
117 info->gatt[0] = SBA_AGPGART_COOKIE;
123 parisc_agp_insert_memory(struct agp_memory *mem, off_t pg_start, int type)
125 struct _parisc_agp_info *info = &parisc_agp_info;
127 off_t j, io_pg_start;
130 if (type != 0 || mem->type != 0) {
134 io_pg_start = info->io_pages_per_kpage * pg_start;
135 io_pg_count = info->io_pages_per_kpage * mem->page_count;
136 if ((io_pg_start + io_pg_count) > info->gatt_entries) {
141 while (j < (io_pg_start + io_pg_count)) {
147 if (mem->is_flushed == FALSE) {
148 global_cache_flush();
149 mem->is_flushed = TRUE;
152 for (i = 0, j = io_pg_start; i < mem->page_count; i++) {
155 paddr = mem->memory[i];
157 k < info->io_pages_per_kpage;
158 k++, j++, paddr += info->io_page_size) {
160 agp_bridge->driver->mask_memory(agp_bridge,
165 agp_bridge->driver->tlb_flush(mem);
171 parisc_agp_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
173 struct _parisc_agp_info *info = &parisc_agp_info;
174 int i, io_pg_start, io_pg_count;
176 if (type != 0 || mem->type != 0) {
180 io_pg_start = info->io_pages_per_kpage * pg_start;
181 io_pg_count = info->io_pages_per_kpage * mem->page_count;
182 for (i = io_pg_start; i < io_pg_count + io_pg_start; i++) {
183 info->gatt[i] = agp_bridge->scratch_page;
186 agp_bridge->driver->tlb_flush(mem);
191 parisc_agp_mask_memory(struct agp_bridge_data *bridge,
192 unsigned long addr, int type)
194 return SBA_PDIR_VALID_BIT | addr;
198 parisc_agp_enable(struct agp_bridge_data *bridge, u32 mode)
200 struct _parisc_agp_info *info = &parisc_agp_info;
203 command = readl(info->lba_regs + info->lba_cap_offset + PCI_AGP_STATUS);
205 command = agp_collect_device_status(bridge, mode, command);
206 command |= 0x00000100;
208 writel(command, info->lba_regs + info->lba_cap_offset + PCI_AGP_COMMAND);
210 agp_device_command(command, (mode & AGP8X_MODE) != 0);
213 static const struct agp_bridge_driver parisc_agp_driver = {
214 .owner = THIS_MODULE,
215 .size_type = FIXED_APER_SIZE,
216 .configure = parisc_agp_configure,
217 .fetch_size = parisc_agp_fetch_size,
218 .tlb_flush = parisc_agp_tlbflush,
219 .mask_memory = parisc_agp_mask_memory,
220 .masks = parisc_agp_masks,
221 .agp_enable = parisc_agp_enable,
222 .cache_flush = global_cache_flush,
223 .create_gatt_table = parisc_agp_create_gatt_table,
224 .free_gatt_table = parisc_agp_free_gatt_table,
225 .insert_memory = parisc_agp_insert_memory,
226 .remove_memory = parisc_agp_remove_memory,
227 .alloc_by_type = agp_generic_alloc_by_type,
228 .free_by_type = agp_generic_free_by_type,
229 .agp_alloc_page = agp_generic_alloc_page,
230 .agp_destroy_page = agp_generic_destroy_page,
231 .agp_type_to_mask_type = agp_generic_type_to_mask_type,
232 .cant_use_aperture = 1,
236 agp_ioc_init(void __iomem *ioc_regs)
238 struct _parisc_agp_info *info = &parisc_agp_info;
239 u64 iova_base, *io_pdir, io_tlb_ps;
242 printk(KERN_INFO DRVPFX "IO PDIR shared with sba_iommu\n");
244 info->ioc_regs = ioc_regs;
246 io_tlb_ps = readq(info->ioc_regs+IOC_TCNFG);
248 case 0: io_tlb_shift = 12; break;
249 case 1: io_tlb_shift = 13; break;
250 case 2: io_tlb_shift = 14; break;
251 case 3: io_tlb_shift = 16; break;
253 printk(KERN_ERR DRVPFX "Invalid IOTLB page size "
254 "configuration 0x%llx\n", io_tlb_ps);
256 info->gatt_entries = 0;
259 info->io_page_size = 1 << io_tlb_shift;
260 info->io_pages_per_kpage = PAGE_SIZE / info->io_page_size;
262 iova_base = readq(info->ioc_regs+IOC_IBASE) & ~0x1;
263 info->gart_base = iova_base + PLUTO_IOVA_SIZE - PLUTO_GART_SIZE;
265 info->gart_size = PLUTO_GART_SIZE;
266 info->gatt_entries = info->gart_size / info->io_page_size;
268 io_pdir = phys_to_virt(readq(info->ioc_regs+IOC_PDIR_BASE));
269 info->gatt = &io_pdir[(PLUTO_IOVA_SIZE/2) >> PAGE_SHIFT];
271 if (info->gatt[0] != SBA_AGPGART_COOKIE) {
273 info->gatt_entries = 0;
274 printk(KERN_ERR DRVPFX "No reserved IO PDIR entry found; "
283 lba_find_capability(int cap)
285 struct _parisc_agp_info *info = &parisc_agp_info;
290 status = readw(info->lba_regs + PCI_STATUS);
291 if (!(status & PCI_STATUS_CAP_LIST))
293 pos = readb(info->lba_regs + PCI_CAPABILITY_LIST);
294 while (ttl-- && pos >= 0x40) {
296 id = readb(info->lba_regs + pos + PCI_CAP_LIST_ID);
301 pos = readb(info->lba_regs + pos + PCI_CAP_LIST_NEXT);
307 agp_lba_init(void __iomem *lba_hpa)
309 struct _parisc_agp_info *info = &parisc_agp_info;
312 info->lba_regs = lba_hpa;
313 info->lba_cap_offset = lba_find_capability(PCI_CAP_ID_AGP);
315 cap = readl(lba_hpa + info->lba_cap_offset) & 0xff;
316 if (cap != PCI_CAP_ID_AGP) {
317 printk(KERN_ERR DRVPFX "Invalid capability ID 0x%02x at 0x%x\n",
318 cap, info->lba_cap_offset);
326 parisc_agp_setup(void __iomem *ioc_hpa, void __iomem *lba_hpa)
328 struct pci_dev *fake_bridge_dev = NULL;
329 struct agp_bridge_data *bridge;
332 fake_bridge_dev = alloc_pci_dev();
333 if (!fake_bridge_dev) {
338 error = agp_ioc_init(ioc_hpa);
342 error = agp_lba_init(lba_hpa);
346 bridge = agp_alloc_bridge();
351 bridge->driver = &parisc_agp_driver;
353 fake_bridge_dev->vendor = PCI_VENDOR_ID_HP;
354 fake_bridge_dev->device = PCI_DEVICE_ID_HP_PCIX_LBA;
355 bridge->dev = fake_bridge_dev;
357 error = agp_add_bridge(bridge);
363 static struct device *next_device(struct klist_iter *i) {
364 struct klist_node * n = klist_next(i);
365 return n ? container_of(n, struct device, knode_parent) : NULL;
369 parisc_agp_init(void)
371 extern struct sba_device *sba_list;
374 struct parisc_device *sba = NULL, *lba = NULL;
375 struct lba_device *lbadev = NULL;
376 struct device *dev = NULL;
382 /* Find our parent Pluto */
384 if (!IS_PLUTO(sba)) {
385 printk(KERN_INFO DRVPFX "No Pluto found, so no AGPGART for you.\n");
389 /* Now search our Pluto for our precious AGP device... */
390 klist_iter_init(&sba->dev.klist_children, &i);
391 while ((dev = next_device(&i))) {
392 struct parisc_device *padev = to_parisc_device(dev);
393 if (IS_QUICKSILVER(padev))
399 printk(KERN_INFO DRVPFX "No AGP devices found.\n");
403 lbadev = parisc_get_drvdata(lba);
405 /* w00t, let's go find our cookies... */
406 parisc_agp_setup(sba_list->ioc[0].ioc_hpa, lbadev->hba.base_addr);
414 module_init(parisc_agp_init);
416 MODULE_AUTHOR("Kyle McMartin <kyle@parisc-linux.org>");
417 MODULE_LICENSE("GPL");