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Linux/drivers/parisc/dino.c

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

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