1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 ** DINO manager
4 **
5 ** (c) Copyright 1999 Red Hat Software
6 ** (c) Copyright 1999 SuSE GmbH
7 ** (c) Copyright 1999,2000 Hewlett-Packard Company
8 ** (c) Copyright 2000 Grant Grundler
9 ** (c) Copyright 2006-2019 Helge Deller
10 **
11 **
12 ** This module provides access to Dino PCI bus (config/IOport spaces)
13 ** and helps manage Dino IRQ lines.
14 **
15 ** Dino interrupt handling is a bit complicated.
16 ** Dino always writes to the broadcast EIR via irr0 for now.
17 ** (BIG WARNING: using broadcast EIR is a really bad thing for SMP!)
18 ** Only one processor interrupt is used for the 11 IRQ line
19 ** inputs to dino.
20 **
21 ** The different between Built-in Dino and Card-Mode
22 ** dino is in chip initialization and pci device initialization.
23 **
24 ** Linux drivers can only use Card-Mode Dino if pci devices I/O port
25 ** BARs are configured and used by the driver. Programming MMIO address
26 ** requires substantial knowledge of available Host I/O address ranges
27 ** is currently not supported. Port/Config accessor functions are the
28 ** same. "BIOS" differences are handled within the existing routines.
29 */
30
31 /* Changes :
32 ** 2001-06-14 : Clement Moyroud (moyroudc@esiee.fr)
33 ** - added support for the integrated RS232.
34 */
35
36 /*
37 ** TODO: create a virtual address for each Dino HPA.
38 ** GSC code might be able to do this since IODC data tells us
39 ** how many pages are used. PCI subsystem could (must?) do this
40 ** for PCI drivers devices which implement/use MMIO registers.
41 */
42
43 #include <linux/delay.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/pci.h>
47 #include <linux/init.h>
48 #include <linux/ioport.h>
49 #include <linux/slab.h>
50 #include <linux/interrupt.h> /* for struct irqaction */
51 #include <linux/spinlock.h> /* for spinlock_t and prototypes */
52
53 #include <asm/pdc.h>
54 #include <asm/page.h>
55 #include <asm/io.h>
56 #include <asm/hardware.h>
57
58 #include "gsc.h"
59 #include "iommu.h"
60
61 #undef DINO_DEBUG
62
63 #ifdef DINO_DEBUG
64 #define DBG(x...) printk(x)
65 #else
66 #define DBG(x...)
67 #endif
68
69 /*
70 ** Config accessor functions only pass in the 8-bit bus number
71 ** and not the 8-bit "PCI Segment" number. Each Dino will be
72 ** assigned a PCI bus number based on "when" it's discovered.
73 **
74 ** The "secondary" bus number is set to this before calling
75 ** pci_scan_bus(). If any PPB's are present, the scan will
76 ** discover them and update the "secondary" and "subordinate"
77 ** fields in Dino's pci_bus structure.
78 **
79 ** Changes in the configuration *will* result in a different
80 ** bus number for each dino.
81 */
82
83 #define is_card_dino(id) ((id)->hw_type == HPHW_A_DMA)
84 #define is_cujo(id) ((id)->hversion == 0x682)
85
86 #define DINO_IAR0 0x004
87 #define DINO_IODC_ADDR 0x008
88 #define DINO_IODC_DATA_0 0x008
89 #define DINO_IODC_DATA_1 0x008
90 #define DINO_IRR0 0x00C
91 #define DINO_IAR1 0x010
92 #define DINO_IRR1 0x014
93 #define DINO_IMR 0x018
94 #define DINO_IPR 0x01C
95 #define DINO_TOC_ADDR 0x020
96 #define DINO_ICR 0x024
97 #define DINO_ILR 0x028
98 #define DINO_IO_COMMAND 0x030
99 #define DINO_IO_STATUS 0x034
100 #define DINO_IO_CONTROL 0x038
101 #define DINO_IO_GSC_ERR_RESP 0x040
102 #define DINO_IO_ERR_INFO 0x044
103 #define DINO_IO_PCI_ERR_RESP 0x048
104 #define DINO_IO_FBB_EN 0x05c
105 #define DINO_IO_ADDR_EN 0x060
106 #define DINO_PCI_ADDR 0x064
107 #define DINO_CONFIG_DATA 0x068
108 #define DINO_IO_DATA 0x06c
109 #define DINO_MEM_DATA 0x070 /* Dino 3.x only */
110 #define DINO_GSC2X_CONFIG 0x7b4
111 #define DINO_GMASK 0x800
112 #define DINO_PAMR 0x804
113 #define DINO_PAPR 0x808
114 #define DINO_DAMODE 0x80c
115 #define DINO_PCICMD 0x810
116 #define DINO_PCISTS 0x814
117 #define DINO_MLTIM 0x81c
118 #define DINO_BRDG_FEAT 0x820
119 #define DINO_PCIROR 0x824
120 #define DINO_PCIWOR 0x828
121 #define DINO_TLTIM 0x830
122
123 #define DINO_IRQS 11 /* bits 0-10 are architected */
124 #define DINO_IRR_MASK 0x5ff /* only 10 bits are implemented */
125 #define DINO_LOCAL_IRQS (DINO_IRQS+1)
126
127 #define DINO_MASK_IRQ(x) (1<<(x))
128
129 #define PCIINTA 0x001
130 #define PCIINTB 0x002
131 #define PCIINTC 0x004
132 #define PCIINTD 0x008
133 #define PCIINTE 0x010
134 #define PCIINTF 0x020
135 #define GSCEXTINT 0x040
136 /* #define xxx 0x080 - bit 7 is "default" */
137 /* #define xxx 0x100 - bit 8 not used */
138 /* #define xxx 0x200 - bit 9 not used */
139 #define RS232INT 0x400
140
141 struct dino_device
142 {
143 struct pci_hba_data hba; /* 'C' inheritance - must be first */
144 spinlock_t dinosaur_pen;
145 u32 imr; /* IRQ's which are enabled */
146 struct gsc_irq gsc_irq;
147 int global_irq[DINO_LOCAL_IRQS]; /* map IMR bit to global irq */
148 #ifdef DINO_DEBUG
149 unsigned int dino_irr0; /* save most recent IRQ line stat */
150 #endif
151 };
152
DINO_DEV(struct pci_hba_data * hba)153 static inline struct dino_device *DINO_DEV(struct pci_hba_data *hba)
154 {
155 return container_of(hba, struct dino_device, hba);
156 }
157
158 /*
159 * Dino Configuration Space Accessor Functions
160 */
161
162 #define DINO_CFG_TOK(bus,dfn,pos) ((u32) ((bus)<<16 | (dfn)<<8 | (pos)))
163
164 /*
165 * keep the current highest bus count to assist in allocating busses. This
166 * tries to keep a global bus count total so that when we discover an
167 * entirely new bus, it can be given a unique bus number.
168 */
169 static int dino_current_bus = 0;
170
dino_cfg_read(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 * val)171 static int dino_cfg_read(struct pci_bus *bus, unsigned int devfn, int where,
172 int size, u32 *val)
173 {
174 struct dino_device *d = DINO_DEV(parisc_walk_tree(bus->bridge));
175 u32 local_bus = (bus->parent == NULL) ? 0 : bus->busn_res.start;
176 u32 v = DINO_CFG_TOK(local_bus, devfn, where & ~3);
177 void __iomem *base_addr = d->hba.base_addr;
178 unsigned long flags;
179
180 DBG("%s: %p, %d, %d, %d\n", __func__, base_addr, devfn, where,
181 size);
182 spin_lock_irqsave(&d->dinosaur_pen, flags);
183
184 /* tell HW which CFG address */
185 __raw_writel(v, base_addr + DINO_PCI_ADDR);
186
187 /* generate cfg read cycle */
188 if (size == 1) {
189 *val = readb(base_addr + DINO_CONFIG_DATA + (where & 3));
190 } else if (size == 2) {
191 *val = readw(base_addr + DINO_CONFIG_DATA + (where & 2));
192 } else if (size == 4) {
193 *val = readl(base_addr + DINO_CONFIG_DATA);
194 }
195
196 spin_unlock_irqrestore(&d->dinosaur_pen, flags);
197 return 0;
198 }
199
200 /*
201 * Dino address stepping "feature":
202 * When address stepping, Dino attempts to drive the bus one cycle too soon
203 * even though the type of cycle (config vs. MMIO) might be different.
204 * The read of Ven/Prod ID is harmless and avoids Dino's address stepping.
205 */
dino_cfg_write(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 val)206 static int dino_cfg_write(struct pci_bus *bus, unsigned int devfn, int where,
207 int size, u32 val)
208 {
209 struct dino_device *d = DINO_DEV(parisc_walk_tree(bus->bridge));
210 u32 local_bus = (bus->parent == NULL) ? 0 : bus->busn_res.start;
211 u32 v = DINO_CFG_TOK(local_bus, devfn, where & ~3);
212 void __iomem *base_addr = d->hba.base_addr;
213 unsigned long flags;
214
215 DBG("%s: %p, %d, %d, %d\n", __func__, base_addr, devfn, where,
216 size);
217 spin_lock_irqsave(&d->dinosaur_pen, flags);
218
219 /* avoid address stepping feature */
220 __raw_writel(v & 0xffffff00, base_addr + DINO_PCI_ADDR);
221 __raw_readl(base_addr + DINO_CONFIG_DATA);
222
223 /* tell HW which CFG address */
224 __raw_writel(v, base_addr + DINO_PCI_ADDR);
225 /* generate cfg read cycle */
226 if (size == 1) {
227 writeb(val, base_addr + DINO_CONFIG_DATA + (where & 3));
228 } else if (size == 2) {
229 writew(val, base_addr + DINO_CONFIG_DATA + (where & 2));
230 } else if (size == 4) {
231 writel(val, base_addr + DINO_CONFIG_DATA);
232 }
233
234 spin_unlock_irqrestore(&d->dinosaur_pen, flags);
235 return 0;
236 }
237
238 static struct pci_ops dino_cfg_ops = {
239 .read = dino_cfg_read,
240 .write = dino_cfg_write,
241 };
242
243
244 /*
245 * Dino "I/O Port" Space Accessor Functions
246 *
247 * Many PCI devices don't require use of I/O port space (eg Tulip,
248 * NCR720) since they export the same registers to both MMIO and
249 * I/O port space. Performance is going to stink if drivers use
250 * I/O port instead of MMIO.
251 */
252
253 #define DINO_PORT_IN(type, size, mask) \
254 static u##size dino_in##size (struct pci_hba_data *d, u16 addr) \
255 { \
256 u##size v; \
257 unsigned long flags; \
258 spin_lock_irqsave(&(DINO_DEV(d)->dinosaur_pen), flags); \
259 /* tell HW which IO Port address */ \
260 __raw_writel((u32) addr, d->base_addr + DINO_PCI_ADDR); \
261 /* generate I/O PORT read cycle */ \
262 v = read##type(d->base_addr+DINO_IO_DATA+(addr&mask)); \
263 spin_unlock_irqrestore(&(DINO_DEV(d)->dinosaur_pen), flags); \
264 return v; \
265 }
266
267 DINO_PORT_IN(b, 8, 3)
268 DINO_PORT_IN(w, 16, 2)
269 DINO_PORT_IN(l, 32, 0)
270
271 #define DINO_PORT_OUT(type, size, mask) \
272 static void dino_out##size (struct pci_hba_data *d, u16 addr, u##size val) \
273 { \
274 unsigned long flags; \
275 spin_lock_irqsave(&(DINO_DEV(d)->dinosaur_pen), flags); \
276 /* tell HW which IO port address */ \
277 __raw_writel((u32) addr, d->base_addr + DINO_PCI_ADDR); \
278 /* generate cfg write cycle */ \
279 write##type(val, d->base_addr+DINO_IO_DATA+(addr&mask)); \
280 spin_unlock_irqrestore(&(DINO_DEV(d)->dinosaur_pen), flags); \
281 }
282
283 DINO_PORT_OUT(b, 8, 3)
284 DINO_PORT_OUT(w, 16, 2)
285 DINO_PORT_OUT(l, 32, 0)
286
287 static struct pci_port_ops dino_port_ops = {
288 .inb = dino_in8,
289 .inw = dino_in16,
290 .inl = dino_in32,
291 .outb = dino_out8,
292 .outw = dino_out16,
293 .outl = dino_out32
294 };
295
dino_mask_irq(struct irq_data * d)296 static void dino_mask_irq(struct irq_data *d)
297 {
298 struct dino_device *dino_dev = irq_data_get_irq_chip_data(d);
299 int local_irq = gsc_find_local_irq(d->irq, dino_dev->global_irq, DINO_LOCAL_IRQS);
300
301 DBG(KERN_WARNING "%s(0x%px, %d)\n", __func__, dino_dev, d->irq);
302
303 /* Clear the matching bit in the IMR register */
304 dino_dev->imr &= ~(DINO_MASK_IRQ(local_irq));
305 __raw_writel(dino_dev->imr, dino_dev->hba.base_addr+DINO_IMR);
306 }
307
dino_unmask_irq(struct irq_data * d)308 static void dino_unmask_irq(struct irq_data *d)
309 {
310 struct dino_device *dino_dev = irq_data_get_irq_chip_data(d);
311 int local_irq = gsc_find_local_irq(d->irq, dino_dev->global_irq, DINO_LOCAL_IRQS);
312 u32 tmp;
313
314 DBG(KERN_WARNING "%s(0x%px, %d)\n", __func__, dino_dev, d->irq);
315
316 /*
317 ** clear pending IRQ bits
318 **
319 ** This does NOT change ILR state!
320 ** See comment below for ILR usage.
321 */
322 __raw_readl(dino_dev->hba.base_addr+DINO_IPR);
323
324 /* set the matching bit in the IMR register */
325 dino_dev->imr |= DINO_MASK_IRQ(local_irq); /* used in dino_isr() */
326 __raw_writel( dino_dev->imr, dino_dev->hba.base_addr+DINO_IMR);
327
328 /* Emulate "Level Triggered" Interrupt
329 ** Basically, a driver is blowing it if the IRQ line is asserted
330 ** while the IRQ is disabled. But tulip.c seems to do that....
331 ** Give 'em a kluge award and a nice round of applause!
332 **
333 ** The gsc_write will generate an interrupt which invokes dino_isr().
334 ** dino_isr() will read IPR and find nothing. But then catch this
335 ** when it also checks ILR.
336 */
337 tmp = __raw_readl(dino_dev->hba.base_addr+DINO_ILR);
338 if (tmp & DINO_MASK_IRQ(local_irq)) {
339 DBG(KERN_WARNING "%s(): IRQ asserted! (ILR 0x%x)\n",
340 __func__, tmp);
341 gsc_writel(dino_dev->gsc_irq.txn_data, dino_dev->gsc_irq.txn_addr);
342 }
343 }
344
345 #ifdef CONFIG_SMP
dino_set_affinity_irq(struct irq_data * d,const struct cpumask * dest,bool force)346 static int dino_set_affinity_irq(struct irq_data *d, const struct cpumask *dest,
347 bool force)
348 {
349 struct dino_device *dino_dev = irq_data_get_irq_chip_data(d);
350 struct cpumask tmask;
351 int cpu_irq;
352 u32 eim;
353
354 if (!cpumask_and(&tmask, dest, cpu_online_mask))
355 return -EINVAL;
356
357 cpu_irq = cpu_check_affinity(d, &tmask);
358 if (cpu_irq < 0)
359 return cpu_irq;
360
361 dino_dev->gsc_irq.txn_addr = txn_affinity_addr(d->irq, cpu_irq);
362 eim = ((u32) dino_dev->gsc_irq.txn_addr) | dino_dev->gsc_irq.txn_data;
363 __raw_writel(eim, dino_dev->hba.base_addr+DINO_IAR0);
364
365 irq_data_update_effective_affinity(d, &tmask);
366
367 return IRQ_SET_MASK_OK;
368 }
369 #endif
370
371 static struct irq_chip dino_interrupt_type = {
372 .name = "GSC-PCI",
373 .irq_unmask = dino_unmask_irq,
374 .irq_mask = dino_mask_irq,
375 #ifdef CONFIG_SMP
376 .irq_set_affinity = dino_set_affinity_irq,
377 #endif
378 };
379
380
381 /*
382 * Handle a Processor interrupt generated by Dino.
383 *
384 * ilr_loop counter is a kluge to prevent a "stuck" IRQ line from
385 * wedging the CPU. Could be removed or made optional at some point.
386 */
dino_isr(int irq,void * intr_dev)387 static irqreturn_t dino_isr(int irq, void *intr_dev)
388 {
389 struct dino_device *dino_dev = intr_dev;
390 u32 mask;
391 int ilr_loop = 100;
392
393 /* read and acknowledge pending interrupts */
394 #ifdef DINO_DEBUG
395 dino_dev->dino_irr0 =
396 #endif
397 mask = __raw_readl(dino_dev->hba.base_addr+DINO_IRR0) & DINO_IRR_MASK;
398
399 if (mask == 0)
400 return IRQ_NONE;
401
402 ilr_again:
403 do {
404 int local_irq = __ffs(mask);
405 int irq = dino_dev->global_irq[local_irq];
406 DBG(KERN_DEBUG "%s(%d, %p) mask 0x%x\n",
407 __func__, irq, intr_dev, mask);
408 generic_handle_irq(irq);
409 mask &= ~DINO_MASK_IRQ(local_irq);
410 } while (mask);
411
412 /* Support for level triggered IRQ lines.
413 **
414 ** Dropping this support would make this routine *much* faster.
415 ** But since PCI requires level triggered IRQ line to share lines...
416 ** device drivers may assume lines are level triggered (and not
417 ** edge triggered like EISA/ISA can be).
418 */
419 mask = __raw_readl(dino_dev->hba.base_addr+DINO_ILR) & dino_dev->imr;
420 if (mask) {
421 if (--ilr_loop > 0)
422 goto ilr_again;
423 pr_warn_ratelimited("Dino 0x%px: stuck interrupt %d\n",
424 dino_dev->hba.base_addr, mask);
425 }
426 return IRQ_HANDLED;
427 }
428
dino_assign_irq(struct dino_device * dino,int local_irq,int * irqp)429 static void dino_assign_irq(struct dino_device *dino, int local_irq, int *irqp)
430 {
431 int irq = gsc_assign_irq(&dino_interrupt_type, dino);
432 if (irq == NO_IRQ)
433 return;
434
435 *irqp = irq;
436 dino->global_irq[local_irq] = irq;
437 }
438
dino_choose_irq(struct parisc_device * dev,void * ctrl)439 static void dino_choose_irq(struct parisc_device *dev, void *ctrl)
440 {
441 int irq;
442 struct dino_device *dino = ctrl;
443
444 switch (dev->id.sversion) {
445 case 0x00084: irq = 8; break; /* PS/2 */
446 case 0x0008c: irq = 10; break; /* RS232 */
447 case 0x00096: irq = 8; break; /* PS/2 */
448 default: return; /* Unknown */
449 }
450
451 dino_assign_irq(dino, irq, &dev->irq);
452 }
453
454
455 /*
456 * Cirrus 6832 Cardbus reports wrong irq on RDI Tadpole PARISC Laptop (deller@gmx.de)
457 * (the irqs are off-by-one, not sure yet if this is a cirrus, dino-hardware or dino-driver problem...)
458 */
quirk_cirrus_cardbus(struct pci_dev * dev)459 static void quirk_cirrus_cardbus(struct pci_dev *dev)
460 {
461 u8 new_irq = dev->irq - 1;
462 printk(KERN_INFO "PCI: Cirrus Cardbus IRQ fixup for %s, from %d to %d\n",
463 pci_name(dev), dev->irq, new_irq);
464 dev->irq = new_irq;
465 }
466 DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_CIRRUS, PCI_DEVICE_ID_CIRRUS_6832, quirk_cirrus_cardbus );
467
468 #ifdef CONFIG_TULIP
469 /* Check if PCI device is behind a Card-mode Dino. */
pci_dev_is_behind_card_dino(struct pci_dev * dev)470 static int pci_dev_is_behind_card_dino(struct pci_dev *dev)
471 {
472 struct dino_device *dino_dev;
473
474 dino_dev = DINO_DEV(parisc_walk_tree(dev->bus->bridge));
475 return is_card_dino(&dino_dev->hba.dev->id);
476 }
477
pci_fixup_tulip(struct pci_dev * dev)478 static void pci_fixup_tulip(struct pci_dev *dev)
479 {
480 if (!pci_dev_is_behind_card_dino(dev))
481 return;
482 if (!(pci_resource_flags(dev, 1) & IORESOURCE_MEM))
483 return;
484 pr_warn("%s: HP HSC-PCI Cards with card-mode Dino not yet supported.\n",
485 pci_name(dev));
486 /* Disable this card by zeroing the PCI resources */
487 memset(&dev->resource[0], 0, sizeof(dev->resource[0]));
488 memset(&dev->resource[1], 0, sizeof(dev->resource[1]));
489 }
490 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_DEC, PCI_ANY_ID, pci_fixup_tulip);
491 #endif /* CONFIG_TULIP */
492
493 static void __init
dino_bios_init(void)494 dino_bios_init(void)
495 {
496 DBG("dino_bios_init\n");
497 }
498
499 /*
500 * dino_card_setup - Set up the memory space for a Dino in card mode.
501 * @bus: the bus under this dino
502 *
503 * Claim an 8MB chunk of unused IO space and call the generic PCI routines
504 * to set up the addresses of the devices on this bus.
505 */
506 #define _8MB 0x00800000UL
507 static void __init
dino_card_setup(struct pci_bus * bus,void __iomem * base_addr)508 dino_card_setup(struct pci_bus *bus, void __iomem *base_addr)
509 {
510 int i;
511 struct dino_device *dino_dev = DINO_DEV(parisc_walk_tree(bus->bridge));
512 struct resource *res;
513 char name[128];
514 int size;
515
516 res = &dino_dev->hba.lmmio_space;
517 res->flags = IORESOURCE_MEM;
518 size = scnprintf(name, sizeof(name), "Dino LMMIO (%s)",
519 dev_name(bus->bridge));
520 res->name = kmalloc(size+1, GFP_KERNEL);
521 if(res->name)
522 strcpy((char *)res->name, name);
523 else
524 res->name = dino_dev->hba.lmmio_space.name;
525
526
527 if (ccio_allocate_resource(dino_dev->hba.dev, res, _8MB,
528 F_EXTEND(0xf0000000UL) | _8MB,
529 F_EXTEND(0xffffffffUL) &~ _8MB, _8MB) < 0) {
530 struct pci_dev *dev, *tmp;
531
532 printk(KERN_ERR "Dino: cannot attach bus %s\n",
533 dev_name(bus->bridge));
534 /* kill the bus, we can't do anything with it */
535 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
536 list_del(&dev->bus_list);
537 }
538
539 return;
540 }
541 bus->resource[1] = res;
542 bus->resource[0] = &(dino_dev->hba.io_space);
543
544 /* Now tell dino what range it has */
545 for (i = 1; i < 31; i++) {
546 if (res->start == F_EXTEND(0xf0000000UL | (i * _8MB)))
547 break;
548 }
549 DBG("DINO GSC WRITE i=%d, start=%lx, dino addr = %p\n",
550 i, res->start, base_addr + DINO_IO_ADDR_EN);
551 __raw_writel(1 << i, base_addr + DINO_IO_ADDR_EN);
552 }
553
554 static void __init
dino_card_fixup(struct pci_dev * dev)555 dino_card_fixup(struct pci_dev *dev)
556 {
557 u32 irq_pin;
558
559 /*
560 ** REVISIT: card-mode PCI-PCI expansion chassis do exist.
561 ** Not sure they were ever productized.
562 ** Die here since we'll die later in dino_inb() anyway.
563 */
564 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
565 panic("Card-Mode Dino: PCI-PCI Bridge not supported\n");
566 }
567
568 /*
569 ** Set Latency Timer to 0xff (not a shared bus)
570 ** Set CACHELINE_SIZE.
571 */
572 dino_cfg_write(dev->bus, dev->devfn,
573 PCI_CACHE_LINE_SIZE, 2, 0xff00 | L1_CACHE_BYTES/4);
574
575 /*
576 ** Program INT_LINE for card-mode devices.
577 ** The cards are hardwired according to this algorithm.
578 ** And it doesn't matter if PPB's are present or not since
579 ** the IRQ lines bypass the PPB.
580 **
581 ** "-1" converts INTA-D (1-4) to PCIINTA-D (0-3) range.
582 ** The additional "-1" adjusts for skewing the IRQ<->slot.
583 */
584 dino_cfg_read(dev->bus, dev->devfn, PCI_INTERRUPT_PIN, 1, &irq_pin);
585 dev->irq = pci_swizzle_interrupt_pin(dev, irq_pin) - 1;
586
587 /* Shouldn't really need to do this but it's in case someone tries
588 ** to bypass PCI services and look at the card themselves.
589 */
590 dino_cfg_write(dev->bus, dev->devfn, PCI_INTERRUPT_LINE, 1, dev->irq);
591 }
592
593 /* The alignment contraints for PCI bridges under dino */
594 #define DINO_BRIDGE_ALIGN 0x100000
595
596
597 static void __init
dino_fixup_bus(struct pci_bus * bus)598 dino_fixup_bus(struct pci_bus *bus)
599 {
600 struct pci_dev *dev;
601 struct dino_device *dino_dev = DINO_DEV(parisc_walk_tree(bus->bridge));
602
603 DBG(KERN_WARNING "%s(0x%px) bus %d platform_data 0x%px\n",
604 __func__, bus, bus->busn_res.start,
605 bus->bridge->platform_data);
606
607 /* Firmware doesn't set up card-mode dino, so we have to */
608 if (is_card_dino(&dino_dev->hba.dev->id)) {
609 dino_card_setup(bus, dino_dev->hba.base_addr);
610 } else if (bus->parent) {
611 int i;
612
613 pci_read_bridge_bases(bus);
614
615
616 for(i = PCI_BRIDGE_RESOURCES; i < PCI_NUM_RESOURCES; i++) {
617 if((bus->self->resource[i].flags &
618 (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
619 continue;
620
621 if(bus->self->resource[i].flags & IORESOURCE_MEM) {
622 /* There's a quirk to alignment of
623 * bridge memory resources: the start
624 * is the alignment and start-end is
625 * the size. However, firmware will
626 * have assigned start and end, so we
627 * need to take this into account */
628 bus->self->resource[i].end = bus->self->resource[i].end - bus->self->resource[i].start + DINO_BRIDGE_ALIGN;
629 bus->self->resource[i].start = DINO_BRIDGE_ALIGN;
630
631 }
632
633 DBG("DEBUG %s assigning %d [%pR]\n",
634 dev_name(&bus->self->dev), i,
635 &bus->self->resource[i]);
636 WARN_ON(pci_assign_resource(bus->self, i));
637 DBG("DEBUG %s after assign %d [%pR]\n",
638 dev_name(&bus->self->dev), i,
639 &bus->self->resource[i]);
640 }
641 }
642
643
644 list_for_each_entry(dev, &bus->devices, bus_list) {
645 if (is_card_dino(&dino_dev->hba.dev->id))
646 dino_card_fixup(dev);
647
648 /*
649 ** P2PB's only have 2 BARs, no IRQs.
650 ** I'd like to just ignore them for now.
651 */
652 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
653 pcibios_init_bridge(dev);
654 continue;
655 }
656
657 /* null out the ROM resource if there is one (we don't
658 * care about an expansion rom on parisc, since it
659 * usually contains (x86) bios code) */
660 dev->resource[PCI_ROM_RESOURCE].flags = 0;
661
662 if(dev->irq == 255) {
663
664 #define DINO_FIX_UNASSIGNED_INTERRUPTS
665 #ifdef DINO_FIX_UNASSIGNED_INTERRUPTS
666
667 /* This code tries to assign an unassigned
668 * interrupt. Leave it disabled unless you
669 * *really* know what you're doing since the
670 * pin<->interrupt line mapping varies by bus
671 * and machine */
672
673 u32 irq_pin;
674
675 dino_cfg_read(dev->bus, dev->devfn,
676 PCI_INTERRUPT_PIN, 1, &irq_pin);
677 irq_pin = pci_swizzle_interrupt_pin(dev, irq_pin) - 1;
678 printk(KERN_WARNING "Device %s has undefined IRQ, "
679 "setting to %d\n", pci_name(dev), irq_pin);
680 dino_cfg_write(dev->bus, dev->devfn,
681 PCI_INTERRUPT_LINE, 1, irq_pin);
682 dino_assign_irq(dino_dev, irq_pin, &dev->irq);
683 #else
684 dev->irq = 65535;
685 printk(KERN_WARNING "Device %s has unassigned IRQ\n", pci_name(dev));
686 #endif
687 } else {
688 /* Adjust INT_LINE for that busses region */
689 dino_assign_irq(dino_dev, dev->irq, &dev->irq);
690 }
691 }
692 }
693
694
695 static struct pci_bios_ops dino_bios_ops = {
696 .init = dino_bios_init,
697 .fixup_bus = dino_fixup_bus
698 };
699
700
701 /*
702 * Initialise a DINO controller chip
703 */
704 static void __init
dino_card_init(struct dino_device * dino_dev)705 dino_card_init(struct dino_device *dino_dev)
706 {
707 u32 brdg_feat = 0x00784e05;
708 unsigned long status;
709
710 status = __raw_readl(dino_dev->hba.base_addr+DINO_IO_STATUS);
711 if (status & 0x0000ff80) {
712 __raw_writel(0x00000005,
713 dino_dev->hba.base_addr+DINO_IO_COMMAND);
714 udelay(1);
715 }
716
717 __raw_writel(0x00000000, dino_dev->hba.base_addr+DINO_GMASK);
718 __raw_writel(0x00000001, dino_dev->hba.base_addr+DINO_IO_FBB_EN);
719 __raw_writel(0x00000000, dino_dev->hba.base_addr+DINO_ICR);
720
721 #if 1
722 /* REVISIT - should be a runtime check (eg if (CPU_IS_PCX_L) ...) */
723 /*
724 ** PCX-L processors don't support XQL like Dino wants it.
725 ** PCX-L2 ignore XQL signal and it doesn't matter.
726 */
727 brdg_feat &= ~0x4; /* UXQL */
728 #endif
729 __raw_writel( brdg_feat, dino_dev->hba.base_addr+DINO_BRDG_FEAT);
730
731 /*
732 ** Don't enable address decoding until we know which I/O range
733 ** currently is available from the host. Only affects MMIO
734 ** and not I/O port space.
735 */
736 __raw_writel(0x00000000, dino_dev->hba.base_addr+DINO_IO_ADDR_EN);
737
738 __raw_writel(0x00000000, dino_dev->hba.base_addr+DINO_DAMODE);
739 __raw_writel(0x00222222, dino_dev->hba.base_addr+DINO_PCIROR);
740 __raw_writel(0x00222222, dino_dev->hba.base_addr+DINO_PCIWOR);
741
742 __raw_writel(0x00000040, dino_dev->hba.base_addr+DINO_MLTIM);
743 __raw_writel(0x00000080, dino_dev->hba.base_addr+DINO_IO_CONTROL);
744 __raw_writel(0x0000008c, dino_dev->hba.base_addr+DINO_TLTIM);
745
746 /* Disable PAMR before writing PAPR */
747 __raw_writel(0x0000007e, dino_dev->hba.base_addr+DINO_PAMR);
748 __raw_writel(0x0000007f, dino_dev->hba.base_addr+DINO_PAPR);
749 __raw_writel(0x00000000, dino_dev->hba.base_addr+DINO_PAMR);
750
751 /*
752 ** Dino ERS encourages enabling FBB (0x6f).
753 ** We can't until we know *all* devices below us can support it.
754 ** (Something in device configuration header tells us).
755 */
756 __raw_writel(0x0000004f, dino_dev->hba.base_addr+DINO_PCICMD);
757
758 /* Somewhere, the PCI spec says give devices 1 second
759 ** to recover from the #RESET being de-asserted.
760 ** Experience shows most devices only need 10ms.
761 ** This short-cut speeds up booting significantly.
762 */
763 mdelay(pci_post_reset_delay);
764 }
765
766 static int __init
dino_bridge_init(struct dino_device * dino_dev,const char * name)767 dino_bridge_init(struct dino_device *dino_dev, const char *name)
768 {
769 unsigned long io_addr;
770 int result, i, count=0;
771 struct resource *res, *prevres = NULL;
772 /*
773 * Decoding IO_ADDR_EN only works for Built-in Dino
774 * since PDC has already initialized this.
775 */
776
777 io_addr = __raw_readl(dino_dev->hba.base_addr + DINO_IO_ADDR_EN);
778 if (io_addr == 0) {
779 printk(KERN_WARNING "%s: No PCI devices enabled.\n", name);
780 return -ENODEV;
781 }
782
783 res = &dino_dev->hba.lmmio_space;
784 for (i = 0; i < 32; i++) {
785 unsigned long start, end;
786
787 if((io_addr & (1 << i)) == 0)
788 continue;
789
790 start = F_EXTEND(0xf0000000UL) | (i << 23);
791 end = start + 8 * 1024 * 1024 - 1;
792
793 DBG("DINO RANGE %d is at 0x%lx-0x%lx\n", count,
794 start, end);
795
796 if(prevres && prevres->end + 1 == start) {
797 prevres->end = end;
798 } else {
799 if(count >= DINO_MAX_LMMIO_RESOURCES) {
800 printk(KERN_ERR "%s is out of resource windows for range %d (0x%lx-0x%lx)\n", name, count, start, end);
801 break;
802 }
803 prevres = res;
804 res->start = start;
805 res->end = end;
806 res->flags = IORESOURCE_MEM;
807 res->name = kmalloc(64, GFP_KERNEL);
808 if(res->name)
809 snprintf((char *)res->name, 64, "%s LMMIO %d",
810 name, count);
811 res++;
812 count++;
813 }
814 }
815
816 res = &dino_dev->hba.lmmio_space;
817
818 for(i = 0; i < DINO_MAX_LMMIO_RESOURCES; i++) {
819 if(res[i].flags == 0)
820 break;
821
822 result = ccio_request_resource(dino_dev->hba.dev, &res[i]);
823 if (result < 0) {
824 printk(KERN_ERR "%s: failed to claim PCI Bus address "
825 "space %d (%pR)!\n", name, i, &res[i]);
826 return result;
827 }
828 }
829 return 0;
830 }
831
dino_common_init(struct parisc_device * dev,struct dino_device * dino_dev,const char * name)832 static int __init dino_common_init(struct parisc_device *dev,
833 struct dino_device *dino_dev, const char *name)
834 {
835 int status;
836 u32 eim;
837 struct resource *res;
838
839 pcibios_register_hba(&dino_dev->hba);
840
841 pci_bios = &dino_bios_ops; /* used by pci_scan_bus() */
842 pci_port = &dino_port_ops;
843
844 /*
845 ** Note: SMP systems can make use of IRR1/IAR1 registers
846 ** But it won't buy much performance except in very
847 ** specific applications/configurations. Note Dino
848 ** still only has 11 IRQ input lines - just map some of them
849 ** to a different processor.
850 */
851 dev->irq = gsc_alloc_irq(&dino_dev->gsc_irq);
852 eim = ((u32) dino_dev->gsc_irq.txn_addr) | dino_dev->gsc_irq.txn_data;
853
854 /*
855 ** Dino needs a PA "IRQ" to get a processor's attention.
856 ** arch/parisc/kernel/irq.c returns an EIRR bit.
857 */
858 if (dev->irq < 0) {
859 printk(KERN_WARNING "%s: gsc_alloc_irq() failed\n", name);
860 return 1;
861 }
862
863 status = request_irq(dev->irq, dino_isr, 0, name, dino_dev);
864 if (status) {
865 printk(KERN_WARNING "%s: request_irq() failed with %d\n",
866 name, status);
867 return 1;
868 }
869
870 /* Support the serial port which is sometimes attached on built-in
871 * Dino / Cujo chips.
872 */
873
874 gsc_fixup_irqs(dev, dino_dev, dino_choose_irq);
875
876 /*
877 ** This enables DINO to generate interrupts when it sees
878 ** any of its inputs *change*. Just asserting an IRQ
879 ** before it's enabled (ie unmasked) isn't good enough.
880 */
881 __raw_writel(eim, dino_dev->hba.base_addr+DINO_IAR0);
882
883 /*
884 ** Some platforms don't clear Dino's IRR0 register at boot time.
885 ** Reading will clear it now.
886 */
887 __raw_readl(dino_dev->hba.base_addr+DINO_IRR0);
888
889 /* allocate I/O Port resource region */
890 res = &dino_dev->hba.io_space;
891 if (!is_cujo(&dev->id)) {
892 res->name = "Dino I/O Port";
893 } else {
894 res->name = "Cujo I/O Port";
895 }
896 res->start = HBA_PORT_BASE(dino_dev->hba.hba_num);
897 res->end = res->start + (HBA_PORT_SPACE_SIZE - 1);
898 res->flags = IORESOURCE_IO; /* do not mark it busy ! */
899 if (request_resource(&ioport_resource, res) < 0) {
900 printk(KERN_ERR "%s: request I/O Port region failed "
901 "0x%lx/%lx (hpa 0x%px)\n",
902 name, (unsigned long)res->start, (unsigned long)res->end,
903 dino_dev->hba.base_addr);
904 return 1;
905 }
906
907 return 0;
908 }
909
910 #define CUJO_RAVEN_ADDR F_EXTEND(0xf1000000UL)
911 #define CUJO_FIREHAWK_ADDR F_EXTEND(0xf1604000UL)
912 #define CUJO_RAVEN_BADPAGE 0x01003000UL
913 #define CUJO_FIREHAWK_BADPAGE 0x01607000UL
914
915 static const char dino_vers[][4] = {
916 "2.0",
917 "2.1",
918 "3.0",
919 "3.1"
920 };
921
922 static const char cujo_vers[][4] = {
923 "1.0",
924 "2.0"
925 };
926
927 /*
928 ** Determine if dino should claim this chip (return 0) or not (return 1).
929 ** If so, initialize the chip appropriately (card-mode vs bridge mode).
930 ** Much of the initialization is common though.
931 */
dino_probe(struct parisc_device * dev)932 static int __init dino_probe(struct parisc_device *dev)
933 {
934 struct dino_device *dino_dev; // Dino specific control struct
935 const char *version = "unknown";
936 char *name;
937 int is_cujo = 0;
938 LIST_HEAD(resources);
939 struct pci_bus *bus;
940 unsigned long hpa = dev->hpa.start;
941 int max;
942
943 name = "Dino";
944 if (is_card_dino(&dev->id)) {
945 version = "3.x (card mode)";
946 } else {
947 if (!is_cujo(&dev->id)) {
948 if (dev->id.hversion_rev < 4) {
949 version = dino_vers[dev->id.hversion_rev];
950 }
951 } else {
952 name = "Cujo";
953 is_cujo = 1;
954 if (dev->id.hversion_rev < 2) {
955 version = cujo_vers[dev->id.hversion_rev];
956 }
957 }
958 }
959
960 printk("%s version %s found at 0x%lx\n", name, version, hpa);
961
962 if (!request_mem_region(hpa, PAGE_SIZE, name)) {
963 printk(KERN_ERR "DINO: Hey! Someone took my MMIO space (0x%lx)!\n",
964 hpa);
965 return 1;
966 }
967
968 /* Check for bugs */
969 if (is_cujo && dev->id.hversion_rev == 1) {
970 #ifdef CONFIG_IOMMU_CCIO
971 printk(KERN_WARNING "Enabling Cujo 2.0 bug workaround\n");
972 if (hpa == (unsigned long)CUJO_RAVEN_ADDR) {
973 ccio_cujo20_fixup(dev, CUJO_RAVEN_BADPAGE);
974 } else if (hpa == (unsigned long)CUJO_FIREHAWK_ADDR) {
975 ccio_cujo20_fixup(dev, CUJO_FIREHAWK_BADPAGE);
976 } else {
977 printk("Don't recognise Cujo at address 0x%lx, not enabling workaround\n", hpa);
978 }
979 #endif
980 } else if (!is_cujo && !is_card_dino(&dev->id) &&
981 dev->id.hversion_rev < 3) {
982 printk(KERN_WARNING
983 "The GSCtoPCI (Dino hrev %d) bus converter found may exhibit\n"
984 "data corruption. See Service Note Numbers: A4190A-01, A4191A-01.\n"
985 "Systems shipped after Aug 20, 1997 will not exhibit this problem.\n"
986 "Models affected: C180, C160, C160L, B160L, and B132L workstations.\n\n",
987 dev->id.hversion_rev);
988 /* REVISIT: why are C200/C240 listed in the README table but not
989 ** "Models affected"? Could be an omission in the original literature.
990 */
991 }
992
993 dino_dev = kzalloc(sizeof(struct dino_device), GFP_KERNEL);
994 if (!dino_dev) {
995 printk("dino_init_chip - couldn't alloc dino_device\n");
996 return 1;
997 }
998
999 dino_dev->hba.dev = dev;
1000 dino_dev->hba.base_addr = ioremap(hpa, 4096);
1001 dino_dev->hba.lmmio_space_offset = PCI_F_EXTEND;
1002 spin_lock_init(&dino_dev->dinosaur_pen);
1003 dino_dev->hba.iommu = ccio_get_iommu(dev);
1004
1005 if (is_card_dino(&dev->id)) {
1006 dino_card_init(dino_dev);
1007 } else {
1008 dino_bridge_init(dino_dev, name);
1009 }
1010
1011 if (dino_common_init(dev, dino_dev, name))
1012 return 1;
1013
1014 dev->dev.platform_data = dino_dev;
1015
1016 pci_add_resource_offset(&resources, &dino_dev->hba.io_space,
1017 HBA_PORT_BASE(dino_dev->hba.hba_num));
1018 if (dino_dev->hba.lmmio_space.flags)
1019 pci_add_resource_offset(&resources, &dino_dev->hba.lmmio_space,
1020 dino_dev->hba.lmmio_space_offset);
1021 if (dino_dev->hba.elmmio_space.flags)
1022 pci_add_resource_offset(&resources, &dino_dev->hba.elmmio_space,
1023 dino_dev->hba.lmmio_space_offset);
1024 if (dino_dev->hba.gmmio_space.flags)
1025 pci_add_resource(&resources, &dino_dev->hba.gmmio_space);
1026
1027 dino_dev->hba.bus_num.start = dino_current_bus;
1028 dino_dev->hba.bus_num.end = 255;
1029 dino_dev->hba.bus_num.flags = IORESOURCE_BUS;
1030 pci_add_resource(&resources, &dino_dev->hba.bus_num);
1031 /*
1032 ** It's not used to avoid chicken/egg problems
1033 ** with configuration accessor functions.
1034 */
1035 dino_dev->hba.hba_bus = bus = pci_create_root_bus(&dev->dev,
1036 dino_current_bus, &dino_cfg_ops, NULL, &resources);
1037 if (!bus) {
1038 printk(KERN_ERR "ERROR: failed to scan PCI bus on %s (duplicate bus number %d?)\n",
1039 dev_name(&dev->dev), dino_current_bus);
1040 pci_free_resource_list(&resources);
1041 /* increment the bus number in case of duplicates */
1042 dino_current_bus++;
1043 return 0;
1044 }
1045
1046 max = pci_scan_child_bus(bus);
1047 pci_bus_update_busn_res_end(bus, max);
1048
1049 /* This code *depends* on scanning being single threaded
1050 * if it isn't, this global bus number count will fail
1051 */
1052 dino_current_bus = max + 1;
1053 pci_bus_assign_resources(bus);
1054 pci_bus_add_devices(bus);
1055 return 0;
1056 }
1057
1058 /*
1059 * Normally, we would just test sversion. But the Elroy PCI adapter has
1060 * the same sversion as Dino, so we have to check hversion as well.
1061 * Unfortunately, the J2240 PDC reports the wrong hversion for the first
1062 * Dino, so we have to test for Dino, Cujo and Dino-in-a-J2240.
1063 * For card-mode Dino, most machines report an sversion of 9D. But 715
1064 * and 725 firmware misreport it as 0x08080 for no adequately explained
1065 * reason.
1066 */
1067 static const struct parisc_device_id dino_tbl[] __initconst = {
1068 { HPHW_A_DMA, HVERSION_REV_ANY_ID, 0x004, 0x0009D },/* Card-mode Dino */
1069 { HPHW_A_DMA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x08080 }, /* XXX */
1070 { HPHW_BRIDGE, HVERSION_REV_ANY_ID, 0x680, 0xa }, /* Bridge-mode Dino */
1071 { HPHW_BRIDGE, HVERSION_REV_ANY_ID, 0x682, 0xa }, /* Bridge-mode Cujo */
1072 { HPHW_BRIDGE, HVERSION_REV_ANY_ID, 0x05d, 0xa }, /* Dino in a J2240 */
1073 { 0, }
1074 };
1075
1076 static struct parisc_driver dino_driver __refdata = {
1077 .name = "dino",
1078 .id_table = dino_tbl,
1079 .probe = dino_probe,
1080 };
1081
1082 /*
1083 * One time initialization to let the world know Dino is here.
1084 * This is the only routine which is NOT static.
1085 * Must be called exactly once before pci_init().
1086 */
dino_init(void)1087 static int __init dino_init(void)
1088 {
1089 return register_parisc_driver(&dino_driver);
1090 }
1091 arch_initcall(dino_init);
1092