1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/arch/alpha/kernel/core_marvel.c
4 *
5 * Code common to all Marvel based systems.
6 */
7
8 #define __EXTERN_INLINE inline
9 #include <asm/io.h>
10 #include <asm/core_marvel.h>
11 #undef __EXTERN_INLINE
12
13 #include <linux/types.h>
14 #include <linux/pci.h>
15 #include <linux/sched.h>
16 #include <linux/init.h>
17 #include <linux/vmalloc.h>
18 #include <linux/mc146818rtc.h>
19 #include <linux/rtc.h>
20 #include <linux/module.h>
21 #include <linux/memblock.h>
22
23 #include <asm/ptrace.h>
24 #include <asm/smp.h>
25 #include <asm/gct.h>
26 #include <asm/tlbflush.h>
27 #include <asm/vga.h>
28
29 #include "proto.h"
30 #include "pci_impl.h"
31
32
33 /*
34 * Debug helpers
35 */
36 #define DEBUG_CONFIG 0
37
38 #if DEBUG_CONFIG
39 # define DBG_CFG(args) printk args
40 #else
41 # define DBG_CFG(args)
42 #endif
43
44
45 /*
46 * Private data
47 */
48 static struct io7 *io7_head = NULL;
49
50
51 /*
52 * Helper functions
53 */
54 static unsigned long __attribute__ ((unused))
55 read_ev7_csr(int pe, unsigned long offset)
56 {
57 ev7_csr *ev7csr = EV7_CSR_KERN(pe, offset);
58 unsigned long q;
59
60 mb();
61 q = ev7csr->csr;
62 mb();
63
64 return q;
65 }
66
67 static void __attribute__ ((unused))
68 write_ev7_csr(int pe, unsigned long offset, unsigned long q)
69 {
70 ev7_csr *ev7csr = EV7_CSR_KERN(pe, offset);
71
72 mb();
73 ev7csr->csr = q;
74 mb();
75 }
76
77 static char * __init
78 mk_resource_name(int pe, int port, char *str)
79 {
80 char tmp[80];
81 char *name;
82
83 sprintf(tmp, "PCI %s PE %d PORT %d", str, pe, port);
84 name = memblock_alloc(strlen(tmp) + 1, SMP_CACHE_BYTES);
85 if (!name)
86 panic("%s: Failed to allocate %zu bytes\n", __func__,
87 strlen(tmp) + 1);
88 strcpy(name, tmp);
89
90 return name;
91 }
92
93 inline struct io7 *
94 marvel_next_io7(struct io7 *prev)
95 {
96 return (prev ? prev->next : io7_head);
97 }
98
99 struct io7 *
100 marvel_find_io7(int pe)
101 {
102 struct io7 *io7;
103
104 for (io7 = io7_head; io7 && io7->pe != pe; io7 = io7->next)
105 continue;
106
107 return io7;
108 }
109
110 static struct io7 * __init
111 alloc_io7(unsigned int pe)
112 {
113 struct io7 *io7;
114 struct io7 *insp;
115 int h;
116
117 if (marvel_find_io7(pe)) {
118 printk(KERN_WARNING "IO7 at PE %d already allocated!\n", pe);
119 return NULL;
120 }
121
122 io7 = memblock_alloc(sizeof(*io7), SMP_CACHE_BYTES);
123 if (!io7)
124 panic("%s: Failed to allocate %zu bytes\n", __func__,
125 sizeof(*io7));
126 io7->pe = pe;
127 raw_spin_lock_init(&io7->irq_lock);
128
129 for (h = 0; h < 4; h++) {
130 io7->ports[h].io7 = io7;
131 io7->ports[h].port = h;
132 io7->ports[h].enabled = 0; /* default to disabled */
133 }
134
135 /*
136 * Insert in pe sorted order.
137 */
138 if (NULL == io7_head) /* empty list */
139 io7_head = io7;
140 else if (io7_head->pe > io7->pe) { /* insert at head */
141 io7->next = io7_head;
142 io7_head = io7;
143 } else { /* insert at position */
144 for (insp = io7_head; insp; insp = insp->next) {
145 if (insp->pe == io7->pe) {
146 printk(KERN_ERR "Too many IO7s at PE %d\n",
147 io7->pe);
148 return NULL;
149 }
150
151 if (NULL == insp->next ||
152 insp->next->pe > io7->pe) { /* insert here */
153 io7->next = insp->next;
154 insp->next = io7;
155 break;
156 }
157 }
158
159 if (NULL == insp) { /* couldn't insert ?!? */
160 printk(KERN_WARNING "Failed to insert IO7 at PE %d "
161 " - adding at head of list\n", io7->pe);
162 io7->next = io7_head;
163 io7_head = io7;
164 }
165 }
166
167 return io7;
168 }
169
170 void
171 io7_clear_errors(struct io7 *io7)
172 {
173 io7_port7_csrs *p7csrs;
174 io7_ioport_csrs *csrs;
175 int port;
176
177
178 /*
179 * First the IO ports.
180 */
181 for (port = 0; port < 4; port++) {
182 csrs = IO7_CSRS_KERN(io7->pe, port);
183
184 csrs->POx_ERR_SUM.csr = -1UL;
185 csrs->POx_TLB_ERR.csr = -1UL;
186 csrs->POx_SPL_COMPLT.csr = -1UL;
187 csrs->POx_TRANS_SUM.csr = -1UL;
188 }
189
190 /*
191 * Then the common ones.
192 */
193 p7csrs = IO7_PORT7_CSRS_KERN(io7->pe);
194
195 p7csrs->PO7_ERROR_SUM.csr = -1UL;
196 p7csrs->PO7_UNCRR_SYM.csr = -1UL;
197 p7csrs->PO7_CRRCT_SYM.csr = -1UL;
198 }
199
200
201 /*
202 * IO7 PCI, PCI/X, AGP configuration.
203 */
204 static void __init
205 io7_init_hose(struct io7 *io7, int port)
206 {
207 static int hose_index = 0;
208
209 struct pci_controller *hose = alloc_pci_controller();
210 struct io7_port *io7_port = &io7->ports[port];
211 io7_ioport_csrs *csrs = IO7_CSRS_KERN(io7->pe, port);
212 int i;
213
214 hose->index = hose_index++; /* arbitrary */
215
216 /*
217 * We don't have an isa or legacy hose, but glibc expects to be
218 * able to use the bus == 0 / dev == 0 form of the iobase syscall
219 * to determine information about the i/o system. Since XFree86
220 * relies on glibc's determination to tell whether or not to use
221 * sparse access, we need to point the pci_isa_hose at a real hose
222 * so at least that determination is correct.
223 */
224 if (hose->index == 0)
225 pci_isa_hose = hose;
226
227 io7_port->csrs = csrs;
228 io7_port->hose = hose;
229 hose->sysdata = io7_port;
230
231 hose->io_space = alloc_resource();
232 hose->mem_space = alloc_resource();
233
234 /*
235 * Base addresses for userland consumption. Since these are going
236 * to be mapped, they are pure physical addresses.
237 */
238 hose->sparse_mem_base = hose->sparse_io_base = 0;
239 hose->dense_mem_base = IO7_MEM_PHYS(io7->pe, port);
240 hose->dense_io_base = IO7_IO_PHYS(io7->pe, port);
241
242 /*
243 * Base addresses and resource ranges for kernel consumption.
244 */
245 hose->config_space_base = (unsigned long)IO7_CONF_KERN(io7->pe, port);
246
247 hose->io_space->start = (unsigned long)IO7_IO_KERN(io7->pe, port);
248 hose->io_space->end = hose->io_space->start + IO7_IO_SPACE - 1;
249 hose->io_space->name = mk_resource_name(io7->pe, port, "IO");
250 hose->io_space->flags = IORESOURCE_IO;
251
252 hose->mem_space->start = (unsigned long)IO7_MEM_KERN(io7->pe, port);
253 hose->mem_space->end = hose->mem_space->start + IO7_MEM_SPACE - 1;
254 hose->mem_space->name = mk_resource_name(io7->pe, port, "MEM");
255 hose->mem_space->flags = IORESOURCE_MEM;
256
257 if (request_resource(&ioport_resource, hose->io_space) < 0)
258 printk(KERN_ERR "Failed to request IO on hose %d\n",
259 hose->index);
260 if (request_resource(&iomem_resource, hose->mem_space) < 0)
261 printk(KERN_ERR "Failed to request MEM on hose %d\n",
262 hose->index);
263
264 /*
265 * Save the existing DMA window settings for later restoration.
266 */
267 for (i = 0; i < 4; i++) {
268 io7_port->saved_wbase[i] = csrs->POx_WBASE[i].csr;
269 io7_port->saved_wmask[i] = csrs->POx_WMASK[i].csr;
270 io7_port->saved_tbase[i] = csrs->POx_TBASE[i].csr;
271 }
272
273 /*
274 * Set up the PCI to main memory translation windows.
275 *
276 * Window 0 is scatter-gather 8MB at 8MB
277 * Window 1 is direct access 1GB at 2GB
278 * Window 2 is scatter-gather (up-to) 1GB at 3GB
279 * Window 3 is disabled
280 */
281
282 /*
283 * TBIA before modifying windows.
284 */
285 marvel_pci_tbi(hose, 0, -1);
286
287 /*
288 * Set up window 0 for scatter-gather 8MB at 8MB.
289 */
290 hose->sg_isa = iommu_arena_new_node(0, hose, 0x00800000, 0x00800000, 0);
291 hose->sg_isa->align_entry = 8; /* cache line boundary */
292 csrs->POx_WBASE[0].csr =
293 hose->sg_isa->dma_base | wbase_m_ena | wbase_m_sg;
294 csrs->POx_WMASK[0].csr = (hose->sg_isa->size - 1) & wbase_m_addr;
295 csrs->POx_TBASE[0].csr = virt_to_phys(hose->sg_isa->ptes);
296
297 /*
298 * Set up window 1 for direct-mapped 1GB at 2GB.
299 */
300 csrs->POx_WBASE[1].csr = __direct_map_base | wbase_m_ena;
301 csrs->POx_WMASK[1].csr = (__direct_map_size - 1) & wbase_m_addr;
302 csrs->POx_TBASE[1].csr = 0;
303
304 /*
305 * Set up window 2 for scatter-gather (up-to) 1GB at 3GB.
306 */
307 hose->sg_pci = iommu_arena_new_node(0, hose, 0xc0000000, 0x40000000, 0);
308 hose->sg_pci->align_entry = 8; /* cache line boundary */
309 csrs->POx_WBASE[2].csr =
310 hose->sg_pci->dma_base | wbase_m_ena | wbase_m_sg;
311 csrs->POx_WMASK[2].csr = (hose->sg_pci->size - 1) & wbase_m_addr;
312 csrs->POx_TBASE[2].csr = virt_to_phys(hose->sg_pci->ptes);
313
314 /*
315 * Disable window 3.
316 */
317 csrs->POx_WBASE[3].csr = 0;
318
319 /*
320 * Make sure that the AGP Monster Window is disabled.
321 */
322 csrs->POx_CTRL.csr &= ~(1UL << 61);
323
324 #if 1
325 printk("FIXME: disabling master aborts\n");
326 csrs->POx_MSK_HEI.csr &= ~(3UL << 14);
327 #endif
328 /*
329 * TBIA after modifying windows.
330 */
331 marvel_pci_tbi(hose, 0, -1);
332 }
333
334 static void __init
335 marvel_init_io7(struct io7 *io7)
336 {
337 int i;
338
339 printk("Initializing IO7 at PID %d\n", io7->pe);
340
341 /*
342 * Get the Port 7 CSR pointer.
343 */
344 io7->csrs = IO7_PORT7_CSRS_KERN(io7->pe);
345
346 /*
347 * Init this IO7's hoses.
348 */
349 for (i = 0; i < IO7_NUM_PORTS; i++) {
350 io7_ioport_csrs *csrs = IO7_CSRS_KERN(io7->pe, i);
351 if (csrs->POx_CACHE_CTL.csr == 8) {
352 io7->ports[i].enabled = 1;
353 io7_init_hose(io7, i);
354 }
355 }
356 }
357
358 static void __init
359 marvel_io7_present(gct6_node *node)
360 {
361 int pe;
362
363 if (node->type != GCT_TYPE_HOSE ||
364 node->subtype != GCT_SUBTYPE_IO_PORT_MODULE)
365 return;
366
367 pe = (node->id >> 8) & 0xff;
368 printk("Found an IO7 at PID %d\n", pe);
369
370 alloc_io7(pe);
371 }
372
373 static void __init
374 marvel_find_console_vga_hose(void)
375 {
376 #ifdef CONFIG_VGA_HOSE
377 u64 *pu64 = (u64 *)((u64)hwrpb + hwrpb->ctbt_offset);
378
379 if (pu64[7] == 3) { /* TERM_TYPE == graphics */
380 struct pci_controller *hose = NULL;
381 int h = (pu64[30] >> 24) & 0xff; /* TERM_OUT_LOC, hose # */
382 struct io7 *io7;
383 int pid, port;
384
385 /* FIXME - encoding is going to have to change for Marvel
386 * since hose will be able to overflow a byte...
387 * need to fix this decode when the console
388 * changes its encoding
389 */
390 printk("console graphics is on hose %d (console)\n", h);
391
392 /*
393 * The console's hose numbering is:
394 *
395 * hose<n:2>: PID
396 * hose<1:0>: PORT
397 *
398 * We need to find the hose at that pid and port
399 */
400 pid = h >> 2;
401 port = h & 3;
402 if ((io7 = marvel_find_io7(pid)))
403 hose = io7->ports[port].hose;
404
405 if (hose) {
406 printk("Console graphics on hose %d\n", hose->index);
407 pci_vga_hose = hose;
408 }
409 }
410 #endif
411 }
412
413 gct6_search_struct gct_wanted_node_list[] __initdata = {
414 { GCT_TYPE_HOSE, GCT_SUBTYPE_IO_PORT_MODULE, marvel_io7_present },
415 { 0, 0, NULL }
416 };
417
418 /*
419 * In case the GCT is not complete, let the user specify PIDs with IO7s
420 * at boot time. Syntax is 'io7=a,b,c,...,n' where a-n are the PIDs (decimal)
421 * where IO7s are connected
422 */
423 static int __init
424 marvel_specify_io7(char *str)
425 {
426 unsigned long pid;
427 struct io7 *io7;
428 char *pchar;
429
430 do {
431 pid = simple_strtoul(str, &pchar, 0);
432 if (pchar != str) {
433 printk("User-specified IO7 at PID %lu\n", pid);
434 io7 = alloc_io7(pid);
435 if (io7) marvel_init_io7(io7);
436 }
437
438 if (pchar == str) pchar++;
439 str = pchar;
440 } while(*str);
441
442 return 1;
443 }
444 __setup("io7=", marvel_specify_io7);
445
446 void __init
447 marvel_init_arch(void)
448 {
449 struct io7 *io7;
450
451 /* With multiple PCI busses, we play with I/O as physical addrs. */
452 ioport_resource.end = ~0UL;
453
454 /* PCI DMA Direct Mapping is 1GB at 2GB. */
455 __direct_map_base = 0x80000000;
456 __direct_map_size = 0x40000000;
457
458 /* Parse the config tree. */
459 gct6_find_nodes(GCT_NODE_PTR(0), gct_wanted_node_list);
460
461 /* Init the io7s. */
462 for (io7 = NULL; NULL != (io7 = marvel_next_io7(io7)); )
463 marvel_init_io7(io7);
464
465 /* Check for graphic console location (if any). */
466 marvel_find_console_vga_hose();
467 }
468
469 void
470 marvel_kill_arch(int mode)
471 {
472 }
473
474
475 /*
476 * PCI Configuration Space access functions
477 *
478 * Configuration space addresses have the following format:
479 *
480 * |2 2 2 2|1 1 1 1|1 1 1 1|1 1
481 * |3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
482 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
483 * |B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|R|R|
484 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
485 *
486 * n:24 reserved for hose base
487 * 23:16 bus number (8 bits = 128 possible buses)
488 * 15:11 Device number (5 bits)
489 * 10:8 function number
490 * 7:2 register number
491 *
492 * Notes:
493 * IO7 determines whether to use a type 0 or type 1 config cycle
494 * based on the bus number. Therefore the bus number must be set
495 * to 0 for the root bus on any hose.
496 *
497 * The function number selects which function of a multi-function device
498 * (e.g., SCSI and Ethernet).
499 *
500 */
501
502 static inline unsigned long
503 build_conf_addr(struct pci_controller *hose, u8 bus,
504 unsigned int devfn, int where)
505 {
506 return (hose->config_space_base | (bus << 16) | (devfn << 8) | where);
507 }
508
509 static unsigned long
510 mk_conf_addr(struct pci_bus *pbus, unsigned int devfn, int where)
511 {
512 struct pci_controller *hose = pbus->sysdata;
513 struct io7_port *io7_port;
514 unsigned long addr = 0;
515 u8 bus = pbus->number;
516
517 if (!hose)
518 return addr;
519
520 /* Check for enabled. */
521 io7_port = hose->sysdata;
522 if (!io7_port->enabled)
523 return addr;
524
525 if (!pbus->parent) { /* No parent means peer PCI bus. */
526 /* Don't support idsel > 20 on primary bus. */
527 if (devfn >= PCI_DEVFN(21, 0))
528 return addr;
529 bus = 0;
530 }
531
532 addr = build_conf_addr(hose, bus, devfn, where);
533
534 DBG_CFG(("mk_conf_addr: returning pci_addr 0x%lx\n", addr));
535 return addr;
536 }
537
538 static int
539 marvel_read_config(struct pci_bus *bus, unsigned int devfn, int where,
540 int size, u32 *value)
541 {
542 unsigned long addr;
543
544 if (0 == (addr = mk_conf_addr(bus, devfn, where)))
545 return PCIBIOS_DEVICE_NOT_FOUND;
546
547 switch(size) {
548 case 1:
549 *value = __kernel_ldbu(*(vucp)addr);
550 break;
551 case 2:
552 *value = __kernel_ldwu(*(vusp)addr);
553 break;
554 case 4:
555 *value = *(vuip)addr;
556 break;
557 default:
558 return PCIBIOS_FUNC_NOT_SUPPORTED;
559 }
560
561 return PCIBIOS_SUCCESSFUL;
562 }
563
564 static int
565 marvel_write_config(struct pci_bus *bus, unsigned int devfn, int where,
566 int size, u32 value)
567 {
568 unsigned long addr;
569
570 if (0 == (addr = mk_conf_addr(bus, devfn, where)))
571 return PCIBIOS_DEVICE_NOT_FOUND;
572
573 switch (size) {
574 case 1:
575 __kernel_stb(value, *(vucp)addr);
576 mb();
577 __kernel_ldbu(*(vucp)addr);
578 break;
579 case 2:
580 __kernel_stw(value, *(vusp)addr);
581 mb();
582 __kernel_ldwu(*(vusp)addr);
583 break;
584 case 4:
585 *(vuip)addr = value;
586 mb();
587 *(vuip)addr;
588 break;
589 default:
590 return PCIBIOS_FUNC_NOT_SUPPORTED;
591 }
592
593 return PCIBIOS_SUCCESSFUL;
594 }
595
596 struct pci_ops marvel_pci_ops =
597 {
598 .read = marvel_read_config,
599 .write = marvel_write_config,
600 };
601
602
603 /*
604 * Other PCI helper functions.
605 */
606 void
607 marvel_pci_tbi(struct pci_controller *hose, dma_addr_t start, dma_addr_t end)
608 {
609 io7_ioport_csrs *csrs = ((struct io7_port *)hose->sysdata)->csrs;
610
611 wmb();
612 csrs->POx_SG_TBIA.csr = 0;
613 mb();
614 csrs->POx_SG_TBIA.csr;
615 }
616
617
618
619 /*
620 * RTC Support
621 */
622 struct marvel_rtc_access_info {
623 unsigned long function;
624 unsigned long index;
625 unsigned long data;
626 };
627
628 static void
629 __marvel_access_rtc(void *info)
630 {
631 struct marvel_rtc_access_info *rtc_access = info;
632
633 register unsigned long __r0 __asm__("$0");
634 register unsigned long __r16 __asm__("$16") = rtc_access->function;
635 register unsigned long __r17 __asm__("$17") = rtc_access->index;
636 register unsigned long __r18 __asm__("$18") = rtc_access->data;
637
638 __asm__ __volatile__(
639 "call_pal %4 # cserve rtc"
640 : "=r"(__r16), "=r"(__r17), "=r"(__r18), "=r"(__r0)
641 : "i"(PAL_cserve), ""(__r16), "1"(__r17), "2"(__r18)
642 : "$1", "$22", "$23", "$24", "$25");
643
644 rtc_access->data = __r0;
645 }
646
647 static u8
648 __marvel_rtc_io(u8 b, unsigned long addr, int write)
649 {
650 static u8 index = 0;
651
652 struct marvel_rtc_access_info rtc_access;
653 u8 ret = 0;
654
655 switch(addr) {
656 case 0x70: /* RTC_PORT(0) */
657 if (write) index = b;
658 ret = index;
659 break;
660
661 case 0x71: /* RTC_PORT(1) */
662 rtc_access.index = index;
663 rtc_access.data = bcd2bin(b);
664 rtc_access.function = 0x48 + !write; /* GET/PUT_TOY */
665
666 __marvel_access_rtc(&rtc_access);
667
668 ret = bin2bcd(rtc_access.data);
669 break;
670
671 default:
672 printk(KERN_WARNING "Illegal RTC port %lx\n", addr);
673 break;
674 }
675
676 return ret;
677 }
678
679
680 /*
681 * IO map support.
682 */
683 void __iomem *
684 marvel_ioremap(unsigned long addr, unsigned long size)
685 {
686 struct pci_controller *hose;
687 unsigned long baddr, last;
688 struct vm_struct *area;
689 unsigned long vaddr;
690 unsigned long *ptes;
691 unsigned long pfn;
692
693 /*
694 * Adjust the address.
695 */
696 FIXUP_MEMADDR_VGA(addr);
697
698 /*
699 * Find the hose.
700 */
701 for (hose = hose_head; hose; hose = hose->next) {
702 if ((addr >> 32) == (hose->mem_space->start >> 32))
703 break;
704 }
705 if (!hose)
706 return NULL;
707
708 /*
709 * We have the hose - calculate the bus limits.
710 */
711 baddr = addr - hose->mem_space->start;
712 last = baddr + size - 1;
713
714 /*
715 * Is it direct-mapped?
716 */
717 if ((baddr >= __direct_map_base) &&
718 ((baddr + size - 1) < __direct_map_base + __direct_map_size)) {
719 addr = IDENT_ADDR | (baddr - __direct_map_base);
720 return (void __iomem *) addr;
721 }
722
723 /*
724 * Check the scatter-gather arena.
725 */
726 if (hose->sg_pci &&
727 baddr >= (unsigned long)hose->sg_pci->dma_base &&
728 last < (unsigned long)hose->sg_pci->dma_base + hose->sg_pci->size) {
729
730 /*
731 * Adjust the limits (mappings must be page aligned)
732 */
733 baddr -= hose->sg_pci->dma_base;
734 last -= hose->sg_pci->dma_base;
735 baddr &= PAGE_MASK;
736 size = PAGE_ALIGN(last) - baddr;
737
738 /*
739 * Map it.
740 */
741 area = get_vm_area(size, VM_IOREMAP);
742 if (!area)
743 return NULL;
744
745 ptes = hose->sg_pci->ptes;
746 for (vaddr = (unsigned long)area->addr;
747 baddr <= last;
748 baddr += PAGE_SIZE, vaddr += PAGE_SIZE) {
749 pfn = ptes[baddr >> PAGE_SHIFT];
750 if (!(pfn & 1)) {
751 printk("ioremap failed... pte not valid...\n");
752 vfree(area->addr);
753 return NULL;
754 }
755 pfn >>= 1; /* make it a true pfn */
756
757 if (__alpha_remap_area_pages(vaddr,
758 pfn << PAGE_SHIFT,
759 PAGE_SIZE, 0)) {
760 printk("FAILED to map...\n");
761 vfree(area->addr);
762 return NULL;
763 }
764 }
765
766 flush_tlb_all();
767
768 vaddr = (unsigned long)area->addr + (addr & ~PAGE_MASK);
769
770 return (void __iomem *) vaddr;
771 }
772
773 /* Assume it was already a reasonable address */
774 vaddr = baddr + hose->mem_space->start;
775 return (void __iomem *) vaddr;
776 }
777
778 void
779 marvel_iounmap(volatile void __iomem *xaddr)
780 {
781 unsigned long addr = (unsigned long) xaddr;
782 if (addr >= VMALLOC_START)
783 vfree((void *)(PAGE_MASK & addr));
784 }
785
786 int
787 marvel_is_mmio(const volatile void __iomem *xaddr)
788 {
789 unsigned long addr = (unsigned long) xaddr;
790
791 if (addr >= VMALLOC_START)
792 return 1;
793 else
794 return (addr & 0xFF000000UL) == 0;
795 }
796
797 #define __marvel_is_port_kbd(a) (((a) == 0x60) || ((a) == 0x64))
798 #define __marvel_is_port_rtc(a) (((a) == 0x70) || ((a) == 0x71))
799
800 void __iomem *marvel_ioportmap (unsigned long addr)
801 {
802 FIXUP_IOADDR_VGA(addr);
803 return (void __iomem *)addr;
804 }
805
806 u8
807 marvel_ioread8(const void __iomem *xaddr)
808 {
809 unsigned long addr = (unsigned long) xaddr;
810 if (__marvel_is_port_kbd(addr))
811 return 0;
812 else if (__marvel_is_port_rtc(addr))
813 return __marvel_rtc_io(0, addr, 0);
814 else if (marvel_is_ioaddr(addr))
815 return __kernel_ldbu(*(vucp)addr);
816 else
817 /* this should catch other legacy addresses
818 that would normally fail on MARVEL,
819 because there really is nothing there...
820 */
821 return ~0;
822 }
823
824 void
825 marvel_iowrite8(u8 b, void __iomem *xaddr)
826 {
827 unsigned long addr = (unsigned long) xaddr;
828 if (__marvel_is_port_kbd(addr))
829 return;
830 else if (__marvel_is_port_rtc(addr))
831 __marvel_rtc_io(b, addr, 1);
832 else if (marvel_is_ioaddr(addr))
833 __kernel_stb(b, *(vucp)addr);
834 }
835
836 #ifndef CONFIG_ALPHA_GENERIC
837 EXPORT_SYMBOL(marvel_ioremap);
838 EXPORT_SYMBOL(marvel_iounmap);
839 EXPORT_SYMBOL(marvel_is_mmio);
840 EXPORT_SYMBOL(marvel_ioportmap);
841 EXPORT_SYMBOL(marvel_ioread8);
842 EXPORT_SYMBOL(marvel_iowrite8);
843 #endif
844
845 /*
846 * AGP GART Support.
847 */
848 #include <linux/agp_backend.h>
849 #include <asm/agp_backend.h>
850 #include <linux/slab.h>
851 #include <linux/delay.h>
852
853 struct marvel_agp_aperture {
854 struct pci_iommu_arena *arena;
855 long pg_start;
856 long pg_count;
857 };
858
859 static int
860 marvel_agp_setup(alpha_agp_info *agp)
861 {
862 struct marvel_agp_aperture *aper;
863
864 if (!alpha_agpgart_size)
865 return -ENOMEM;
866
867 aper = kmalloc(sizeof(*aper), GFP_KERNEL);
868 if (aper == NULL) return -ENOMEM;
869
870 aper->arena = agp->hose->sg_pci;
871 aper->pg_count = alpha_agpgart_size / PAGE_SIZE;
872 aper->pg_start = iommu_reserve(aper->arena, aper->pg_count,
873 aper->pg_count - 1);
874
875 if (aper->pg_start < 0) {
876 printk(KERN_ERR "Failed to reserve AGP memory\n");
877 kfree(aper);
878 return -ENOMEM;
879 }
880
881 agp->aperture.bus_base =
882 aper->arena->dma_base + aper->pg_start * PAGE_SIZE;
883 agp->aperture.size = aper->pg_count * PAGE_SIZE;
884 agp->aperture.sysdata = aper;
885
886 return 0;
887 }
888
889 static void
890 marvel_agp_cleanup(alpha_agp_info *agp)
891 {
892 struct marvel_agp_aperture *aper = agp->aperture.sysdata;
893 int status;
894
895 status = iommu_release(aper->arena, aper->pg_start, aper->pg_count);
896 if (status == -EBUSY) {
897 printk(KERN_WARNING
898 "Attempted to release bound AGP memory - unbinding\n");
899 iommu_unbind(aper->arena, aper->pg_start, aper->pg_count);
900 status = iommu_release(aper->arena, aper->pg_start,
901 aper->pg_count);
902 }
903 if (status < 0)
904 printk(KERN_ERR "Failed to release AGP memory\n");
905
906 kfree(aper);
907 kfree(agp);
908 }
909
910 static int
911 marvel_agp_configure(alpha_agp_info *agp)
912 {
913 io7_ioport_csrs *csrs = ((struct io7_port *)agp->hose->sysdata)->csrs;
914 struct io7 *io7 = ((struct io7_port *)agp->hose->sysdata)->io7;
915 unsigned int new_rate = 0;
916 unsigned long agp_pll;
917
918 /*
919 * Check the requested mode against the PLL setting.
920 * The agpgart_be code has not programmed the card yet,
921 * so we can still tweak mode here.
922 */
923 agp_pll = io7->csrs->POx_RST[IO7_AGP_PORT].csr;
924 switch(IO7_PLL_RNGB(agp_pll)) {
925 case 0x4: /* 2x only */
926 /*
927 * The PLL is only programmed for 2x, so adjust the
928 * rate to 2x, if necessary.
929 */
930 if (agp->mode.bits.rate != 2)
931 new_rate = 2;
932 break;
933
934 case 0x6: /* 1x / 4x */
935 /*
936 * The PLL is programmed for 1x or 4x. Don't go faster
937 * than requested, so if the requested rate is 2x, use 1x.
938 */
939 if (agp->mode.bits.rate == 2)
940 new_rate = 1;
941 break;
942
943 default: /* ??????? */
944 /*
945 * Don't know what this PLL setting is, take the requested
946 * rate, but warn the user.
947 */
948 printk("%s: unknown PLL setting RNGB=%lx (PLL6_CTL=%016lx)\n",
949 __func__, IO7_PLL_RNGB(agp_pll), agp_pll);
950 break;
951 }
952
953 /*
954 * Set the new rate, if necessary.
955 */
956 if (new_rate) {
957 printk("Requested AGP Rate %dX not compatible "
958 "with PLL setting - using %dX\n",
959 agp->mode.bits.rate,
960 new_rate);
961
962 agp->mode.bits.rate = new_rate;
963 }
964
965 printk("Enabling AGP on hose %d: %dX%s RQ %d\n",
966 agp->hose->index, agp->mode.bits.rate,
967 agp->mode.bits.sba ? " - SBA" : "", agp->mode.bits.rq);
968
969 csrs->AGP_CMD.csr = agp->mode.lw;
970
971 return 0;
972 }
973
974 static int
975 marvel_agp_bind_memory(alpha_agp_info *agp, off_t pg_start, struct agp_memory *mem)
976 {
977 struct marvel_agp_aperture *aper = agp->aperture.sysdata;
978 return iommu_bind(aper->arena, aper->pg_start + pg_start,
979 mem->page_count, mem->pages);
980 }
981
982 static int
983 marvel_agp_unbind_memory(alpha_agp_info *agp, off_t pg_start, struct agp_memory *mem)
984 {
985 struct marvel_agp_aperture *aper = agp->aperture.sysdata;
986 return iommu_unbind(aper->arena, aper->pg_start + pg_start,
987 mem->page_count);
988 }
989
990 static unsigned long
991 marvel_agp_translate(alpha_agp_info *agp, dma_addr_t addr)
992 {
993 struct marvel_agp_aperture *aper = agp->aperture.sysdata;
994 unsigned long baddr = addr - aper->arena->dma_base;
995 unsigned long pte;
996
997 if (addr < agp->aperture.bus_base ||
998 addr >= agp->aperture.bus_base + agp->aperture.size) {
999 printk("%s: addr out of range\n", __func__);
1000 return -EINVAL;
1001 }
1002
1003 pte = aper->arena->ptes[baddr >> PAGE_SHIFT];
1004 if (!(pte & 1)) {
1005 printk("%s: pte not valid\n", __func__);
1006 return -EINVAL;
1007 }
1008 return (pte >> 1) << PAGE_SHIFT;
1009 }
1010
1011 struct alpha_agp_ops marvel_agp_ops =
1012 {
1013 .setup = marvel_agp_setup,
1014 .cleanup = marvel_agp_cleanup,
1015 .configure = marvel_agp_configure,
1016 .bind = marvel_agp_bind_memory,
1017 .unbind = marvel_agp_unbind_memory,
1018 .translate = marvel_agp_translate
1019 };
1020
1021 alpha_agp_info *
1022 marvel_agp_info(void)
1023 {
1024 struct pci_controller *hose;
1025 io7_ioport_csrs *csrs;
1026 alpha_agp_info *agp;
1027 struct io7 *io7;
1028
1029 /*
1030 * Find the first IO7 with an AGP card.
1031 *
1032 * FIXME -- there should be a better way (we want to be able to
1033 * specify and what if the agp card is not video???)
1034 */
1035 hose = NULL;
1036 for (io7 = NULL; (io7 = marvel_next_io7(io7)) != NULL; ) {
1037 struct pci_controller *h;
1038 vuip addr;
1039
1040 if (!io7->ports[IO7_AGP_PORT].enabled)
1041 continue;
1042
1043 h = io7->ports[IO7_AGP_PORT].hose;
1044 addr = (vuip)build_conf_addr(h, 0, PCI_DEVFN(5, 0), 0);
1045
1046 if (*addr != 0xffffffffu) {
1047 hose = h;
1048 break;
1049 }
1050 }
1051
1052 if (!hose || !hose->sg_pci)
1053 return NULL;
1054
1055 printk("MARVEL - using hose %d as AGP\n", hose->index);
1056
1057 /*
1058 * Get the csrs from the hose.
1059 */
1060 csrs = ((struct io7_port *)hose->sysdata)->csrs;
1061
1062 /*
1063 * Allocate the info structure.
1064 */
1065 agp = kmalloc(sizeof(*agp), GFP_KERNEL);
1066 if (!agp)
1067 return NULL;
1068
1069 /*
1070 * Fill it in.
1071 */
1072 agp->hose = hose;
1073 agp->private = NULL;
1074 agp->ops = &marvel_agp_ops;
1075
1076 /*
1077 * Aperture - not configured until ops.setup().
1078 */
1079 agp->aperture.bus_base = 0;
1080 agp->aperture.size = 0;
1081 agp->aperture.sysdata = NULL;
1082
1083 /*
1084 * Capabilities.
1085 *
1086 * NOTE: IO7 reports through AGP_STAT that it can support a read queue
1087 * depth of 17 (rq = 0x10). It actually only supports a depth of
1088 * 16 (rq = 0xf).
1089 */
1090 agp->capability.lw = csrs->AGP_STAT.csr;
1091 agp->capability.bits.rq = 0xf;
1092
1093 /*
1094 * Mode.
1095 */
1096 agp->mode.lw = csrs->AGP_CMD.csr;
1097
1098 return agp;
1099 }
1100
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