1 /* $Id: pci.c,v 1.39 2002/01/05 01:13:43 davem Exp $
2 * pci.c: UltraSparc PCI controller support.
4 * Copyright (C) 1997, 1998, 1999 David S. Miller (davem@redhat.com)
5 * Copyright (C) 1998, 1999 Eddie C. Dost (ecd@skynet.be)
6 * Copyright (C) 1999 Jakub Jelinek (jj@ultra.linux.cz)
9 #include <linux/config.h>
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/string.h>
13 #include <linux/sched.h>
14 #include <linux/capability.h>
15 #include <linux/errno.h>
16 #include <linux/smp_lock.h>
17 #include <linux/init.h>
19 #include <asm/uaccess.h>
21 #include <asm/pgtable.h>
27 unsigned long pci_memspace_mask
= 0xffffffffUL
;
30 /* A "nop" PCI implementation. */
31 asmlinkage
int sys_pciconfig_read(unsigned long bus
, unsigned long dfn
,
32 unsigned long off
, unsigned long len
,
37 asmlinkage
int sys_pciconfig_write(unsigned long bus
, unsigned long dfn
,
38 unsigned long off
, unsigned long len
,
45 /* List of all PCI controllers found in the system. */
46 struct pci_controller_info
*pci_controller_root
= NULL
;
48 /* Each PCI controller found gets a unique index. */
49 int pci_num_controllers
= 0;
51 volatile int pci_poke_in_progress
;
52 volatile int pci_poke_cpu
= -1;
53 volatile int pci_poke_faulted
;
55 static DEFINE_SPINLOCK(pci_poke_lock
);
57 void pci_config_read8(u8
*addr
, u8
*ret
)
62 spin_lock_irqsave(&pci_poke_lock
, flags
);
63 pci_poke_cpu
= smp_processor_id();
64 pci_poke_in_progress
= 1;
66 __asm__
__volatile__("membar #Sync\n\t"
67 "lduba [%1] %2, %0\n\t"
70 : "r" (addr
), "i" (ASI_PHYS_BYPASS_EC_E_L
)
72 pci_poke_in_progress
= 0;
74 if (!pci_poke_faulted
)
76 spin_unlock_irqrestore(&pci_poke_lock
, flags
);
79 void pci_config_read16(u16
*addr
, u16
*ret
)
84 spin_lock_irqsave(&pci_poke_lock
, flags
);
85 pci_poke_cpu
= smp_processor_id();
86 pci_poke_in_progress
= 1;
88 __asm__
__volatile__("membar #Sync\n\t"
89 "lduha [%1] %2, %0\n\t"
92 : "r" (addr
), "i" (ASI_PHYS_BYPASS_EC_E_L
)
94 pci_poke_in_progress
= 0;
96 if (!pci_poke_faulted
)
98 spin_unlock_irqrestore(&pci_poke_lock
, flags
);
101 void pci_config_read32(u32
*addr
, u32
*ret
)
106 spin_lock_irqsave(&pci_poke_lock
, flags
);
107 pci_poke_cpu
= smp_processor_id();
108 pci_poke_in_progress
= 1;
109 pci_poke_faulted
= 0;
110 __asm__
__volatile__("membar #Sync\n\t"
111 "lduwa [%1] %2, %0\n\t"
114 : "r" (addr
), "i" (ASI_PHYS_BYPASS_EC_E_L
)
116 pci_poke_in_progress
= 0;
118 if (!pci_poke_faulted
)
120 spin_unlock_irqrestore(&pci_poke_lock
, flags
);
123 void pci_config_write8(u8
*addr
, u8 val
)
127 spin_lock_irqsave(&pci_poke_lock
, flags
);
128 pci_poke_cpu
= smp_processor_id();
129 pci_poke_in_progress
= 1;
130 pci_poke_faulted
= 0;
131 __asm__
__volatile__("membar #Sync\n\t"
132 "stba %0, [%1] %2\n\t"
135 : "r" (val
), "r" (addr
), "i" (ASI_PHYS_BYPASS_EC_E_L
)
137 pci_poke_in_progress
= 0;
139 spin_unlock_irqrestore(&pci_poke_lock
, flags
);
142 void pci_config_write16(u16
*addr
, u16 val
)
146 spin_lock_irqsave(&pci_poke_lock
, flags
);
147 pci_poke_cpu
= smp_processor_id();
148 pci_poke_in_progress
= 1;
149 pci_poke_faulted
= 0;
150 __asm__
__volatile__("membar #Sync\n\t"
151 "stha %0, [%1] %2\n\t"
154 : "r" (val
), "r" (addr
), "i" (ASI_PHYS_BYPASS_EC_E_L
)
156 pci_poke_in_progress
= 0;
158 spin_unlock_irqrestore(&pci_poke_lock
, flags
);
161 void pci_config_write32(u32
*addr
, u32 val
)
165 spin_lock_irqsave(&pci_poke_lock
, flags
);
166 pci_poke_cpu
= smp_processor_id();
167 pci_poke_in_progress
= 1;
168 pci_poke_faulted
= 0;
169 __asm__
__volatile__("membar #Sync\n\t"
170 "stwa %0, [%1] %2\n\t"
173 : "r" (val
), "r" (addr
), "i" (ASI_PHYS_BYPASS_EC_E_L
)
175 pci_poke_in_progress
= 0;
177 spin_unlock_irqrestore(&pci_poke_lock
, flags
);
180 /* Probe for all PCI controllers in the system. */
181 extern void sabre_init(struct device_node
*, const char *);
182 extern void psycho_init(struct device_node
*, const char *);
183 extern void schizo_init(struct device_node
*, const char *);
184 extern void schizo_plus_init(struct device_node
*, const char *);
185 extern void tomatillo_init(struct device_node
*, const char *);
186 extern void sun4v_pci_init(struct device_node
*, const char *);
190 void (*init
)(struct device_node
*, const char *);
191 } pci_controller_table
[] __initdata
= {
192 { "SUNW,sabre", sabre_init
},
193 { "pci108e,a000", sabre_init
},
194 { "pci108e,a001", sabre_init
},
195 { "SUNW,psycho", psycho_init
},
196 { "pci108e,8000", psycho_init
},
197 { "SUNW,schizo", schizo_init
},
198 { "pci108e,8001", schizo_init
},
199 { "SUNW,schizo+", schizo_plus_init
},
200 { "pci108e,8002", schizo_plus_init
},
201 { "SUNW,tomatillo", tomatillo_init
},
202 { "pci108e,a801", tomatillo_init
},
203 { "SUNW,sun4v-pci", sun4v_pci_init
},
205 #define PCI_NUM_CONTROLLER_TYPES (sizeof(pci_controller_table) / \
206 sizeof(pci_controller_table[0]))
208 static int __init
pci_controller_init(const char *model_name
, int namelen
, struct device_node
*dp
)
212 for (i
= 0; i
< PCI_NUM_CONTROLLER_TYPES
; i
++) {
213 if (!strncmp(model_name
,
214 pci_controller_table
[i
].model_name
,
216 pci_controller_table
[i
].init(dp
, model_name
);
224 static int __init
pci_is_controller(const char *model_name
, int namelen
, struct device_node
*dp
)
228 for (i
= 0; i
< PCI_NUM_CONTROLLER_TYPES
; i
++) {
229 if (!strncmp(model_name
,
230 pci_controller_table
[i
].model_name
,
238 static int __init
pci_controller_scan(int (*handler
)(const char *, int, struct device_node
*))
240 struct device_node
*dp
;
243 for_each_node_by_name(dp
, "pci") {
244 struct property
*prop
;
247 prop
= of_find_property(dp
, "model", &len
);
249 prop
= of_find_property(dp
, "compatible", &len
);
252 const char *model
= prop
->value
;
255 /* Our value may be a multi-valued string in the
256 * case of some compatible properties. For sanity,
257 * only try the first one.
259 while (model
[item_len
] && len
) {
264 if (handler(model
, item_len
, dp
))
273 /* Is there some PCI controller in the system? */
274 int __init
pcic_present(void)
276 return pci_controller_scan(pci_is_controller
);
279 struct pci_iommu_ops
*pci_iommu_ops
;
280 EXPORT_SYMBOL(pci_iommu_ops
);
282 extern struct pci_iommu_ops pci_sun4u_iommu_ops
,
285 /* Find each controller in the system, attach and initialize
286 * software state structure for each and link into the
287 * pci_controller_root. Setup the controller enough such
288 * that bus scanning can be done.
290 static void __init
pci_controller_probe(void)
292 if (tlb_type
== hypervisor
)
293 pci_iommu_ops
= &pci_sun4v_iommu_ops
;
295 pci_iommu_ops
= &pci_sun4u_iommu_ops
;
297 printk("PCI: Probing for controllers.\n");
299 pci_controller_scan(pci_controller_init
);
302 static void __init
pci_scan_each_controller_bus(void)
304 struct pci_controller_info
*p
;
306 for (p
= pci_controller_root
; p
; p
= p
->next
)
310 extern void clock_probe(void);
311 extern void power_init(void);
313 static int __init
pcibios_init(void)
315 pci_controller_probe();
316 if (pci_controller_root
== NULL
)
319 pci_scan_each_controller_bus();
329 subsys_initcall(pcibios_init
);
331 void pcibios_fixup_bus(struct pci_bus
*pbus
)
333 struct pci_pbm_info
*pbm
= pbus
->sysdata
;
335 /* Generic PCI bus probing sets these to point at
336 * &io{port,mem}_resouce which is wrong for us.
338 pbus
->resource
[0] = &pbm
->io_space
;
339 pbus
->resource
[1] = &pbm
->mem_space
;
342 struct resource
*pcibios_select_root(struct pci_dev
*pdev
, struct resource
*r
)
344 struct pci_pbm_info
*pbm
= pdev
->bus
->sysdata
;
345 struct resource
*root
= NULL
;
347 if (r
->flags
& IORESOURCE_IO
)
348 root
= &pbm
->io_space
;
349 if (r
->flags
& IORESOURCE_MEM
)
350 root
= &pbm
->mem_space
;
355 void pcibios_update_irq(struct pci_dev
*pdev
, int irq
)
359 void pcibios_align_resource(void *data
, struct resource
*res
,
360 unsigned long size
, unsigned long align
)
364 int pcibios_enable_device(struct pci_dev
*pdev
, int mask
)
369 void pcibios_resource_to_bus(struct pci_dev
*pdev
, struct pci_bus_region
*region
,
370 struct resource
*res
)
372 struct pci_pbm_info
*pbm
= pdev
->bus
->sysdata
;
373 struct resource zero_res
, *root
;
377 zero_res
.flags
= res
->flags
;
379 if (res
->flags
& IORESOURCE_IO
)
380 root
= &pbm
->io_space
;
382 root
= &pbm
->mem_space
;
384 pbm
->parent
->resource_adjust(pdev
, &zero_res
, root
);
386 region
->start
= res
->start
- zero_res
.start
;
387 region
->end
= res
->end
- zero_res
.start
;
389 EXPORT_SYMBOL(pcibios_resource_to_bus
);
391 void pcibios_bus_to_resource(struct pci_dev
*pdev
, struct resource
*res
,
392 struct pci_bus_region
*region
)
394 struct pci_pbm_info
*pbm
= pdev
->bus
->sysdata
;
395 struct resource
*root
;
397 res
->start
= region
->start
;
398 res
->end
= region
->end
;
400 if (res
->flags
& IORESOURCE_IO
)
401 root
= &pbm
->io_space
;
403 root
= &pbm
->mem_space
;
405 pbm
->parent
->resource_adjust(pdev
, res
, root
);
407 EXPORT_SYMBOL(pcibios_bus_to_resource
);
409 extern int pci_irq_verbose
;
411 char * __init
pcibios_setup(char *str
)
413 if (!strcmp(str
, "irq_verbose")) {
420 /* Platform support for /proc/bus/pci/X/Y mmap()s. */
422 /* If the user uses a host-bridge as the PCI device, he may use
423 * this to perform a raw mmap() of the I/O or MEM space behind
426 * This can be useful for execution of x86 PCI bios initialization code
427 * on a PCI card, like the xfree86 int10 stuff does.
429 static int __pci_mmap_make_offset_bus(struct pci_dev
*pdev
, struct vm_area_struct
*vma
,
430 enum pci_mmap_state mmap_state
)
432 struct pcidev_cookie
*pcp
= pdev
->sysdata
;
433 struct pci_pbm_info
*pbm
;
434 struct pci_controller_info
*p
;
435 unsigned long space_size
, user_offset
, user_size
;
444 if (p
->pbms_same_domain
) {
445 unsigned long lowest
, highest
;
447 lowest
= ~0UL; highest
= 0UL;
448 if (mmap_state
== pci_mmap_io
) {
449 if (p
->pbm_A
.io_space
.flags
) {
450 lowest
= p
->pbm_A
.io_space
.start
;
451 highest
= p
->pbm_A
.io_space
.end
+ 1;
453 if (p
->pbm_B
.io_space
.flags
) {
454 if (lowest
> p
->pbm_B
.io_space
.start
)
455 lowest
= p
->pbm_B
.io_space
.start
;
456 if (highest
< p
->pbm_B
.io_space
.end
+ 1)
457 highest
= p
->pbm_B
.io_space
.end
+ 1;
459 space_size
= highest
- lowest
;
461 if (p
->pbm_A
.mem_space
.flags
) {
462 lowest
= p
->pbm_A
.mem_space
.start
;
463 highest
= p
->pbm_A
.mem_space
.end
+ 1;
465 if (p
->pbm_B
.mem_space
.flags
) {
466 if (lowest
> p
->pbm_B
.mem_space
.start
)
467 lowest
= p
->pbm_B
.mem_space
.start
;
468 if (highest
< p
->pbm_B
.mem_space
.end
+ 1)
469 highest
= p
->pbm_B
.mem_space
.end
+ 1;
471 space_size
= highest
- lowest
;
474 if (mmap_state
== pci_mmap_io
) {
475 space_size
= (pbm
->io_space
.end
-
476 pbm
->io_space
.start
) + 1;
478 space_size
= (pbm
->mem_space
.end
-
479 pbm
->mem_space
.start
) + 1;
483 /* Make sure the request is in range. */
484 user_offset
= vma
->vm_pgoff
<< PAGE_SHIFT
;
485 user_size
= vma
->vm_end
- vma
->vm_start
;
487 if (user_offset
>= space_size
||
488 (user_offset
+ user_size
) > space_size
)
491 if (p
->pbms_same_domain
) {
492 unsigned long lowest
= ~0UL;
494 if (mmap_state
== pci_mmap_io
) {
495 if (p
->pbm_A
.io_space
.flags
)
496 lowest
= p
->pbm_A
.io_space
.start
;
497 if (p
->pbm_B
.io_space
.flags
&&
498 lowest
> p
->pbm_B
.io_space
.start
)
499 lowest
= p
->pbm_B
.io_space
.start
;
501 if (p
->pbm_A
.mem_space
.flags
)
502 lowest
= p
->pbm_A
.mem_space
.start
;
503 if (p
->pbm_B
.mem_space
.flags
&&
504 lowest
> p
->pbm_B
.mem_space
.start
)
505 lowest
= p
->pbm_B
.mem_space
.start
;
507 vma
->vm_pgoff
= (lowest
+ user_offset
) >> PAGE_SHIFT
;
509 if (mmap_state
== pci_mmap_io
) {
510 vma
->vm_pgoff
= (pbm
->io_space
.start
+
511 user_offset
) >> PAGE_SHIFT
;
513 vma
->vm_pgoff
= (pbm
->mem_space
.start
+
514 user_offset
) >> PAGE_SHIFT
;
521 /* Adjust vm_pgoff of VMA such that it is the physical page offset corresponding
522 * to the 32-bit pci bus offset for DEV requested by the user.
524 * Basically, the user finds the base address for his device which he wishes
525 * to mmap. They read the 32-bit value from the config space base register,
526 * add whatever PAGE_SIZE multiple offset they wish, and feed this into the
527 * offset parameter of mmap on /proc/bus/pci/XXX for that device.
529 * Returns negative error code on failure, zero on success.
531 static int __pci_mmap_make_offset(struct pci_dev
*dev
, struct vm_area_struct
*vma
,
532 enum pci_mmap_state mmap_state
)
534 unsigned long user_offset
= vma
->vm_pgoff
<< PAGE_SHIFT
;
535 unsigned long user32
= user_offset
& pci_memspace_mask
;
536 unsigned long largest_base
, this_base
, addr32
;
539 if ((dev
->class >> 8) == PCI_CLASS_BRIDGE_HOST
)
540 return __pci_mmap_make_offset_bus(dev
, vma
, mmap_state
);
542 /* Figure out which base address this is for. */
544 for (i
= 0; i
<= PCI_ROM_RESOURCE
; i
++) {
545 struct resource
*rp
= &dev
->resource
[i
];
552 if (i
== PCI_ROM_RESOURCE
) {
553 if (mmap_state
!= pci_mmap_mem
)
556 if ((mmap_state
== pci_mmap_io
&&
557 (rp
->flags
& IORESOURCE_IO
) == 0) ||
558 (mmap_state
== pci_mmap_mem
&&
559 (rp
->flags
& IORESOURCE_MEM
) == 0))
563 this_base
= rp
->start
;
565 addr32
= (this_base
& PAGE_MASK
) & pci_memspace_mask
;
567 if (mmap_state
== pci_mmap_io
)
570 if (addr32
<= user32
&& this_base
> largest_base
)
571 largest_base
= this_base
;
574 if (largest_base
== 0UL)
577 /* Now construct the final physical address. */
578 if (mmap_state
== pci_mmap_io
)
579 vma
->vm_pgoff
= (((largest_base
& ~0xffffffUL
) | user32
) >> PAGE_SHIFT
);
581 vma
->vm_pgoff
= (((largest_base
& ~(pci_memspace_mask
)) | user32
) >> PAGE_SHIFT
);
586 /* Set vm_flags of VMA, as appropriate for this architecture, for a pci device
589 static void __pci_mmap_set_flags(struct pci_dev
*dev
, struct vm_area_struct
*vma
,
590 enum pci_mmap_state mmap_state
)
592 vma
->vm_flags
|= (VM_IO
| VM_RESERVED
);
595 /* Set vm_page_prot of VMA, as appropriate for this architecture, for a pci
598 static void __pci_mmap_set_pgprot(struct pci_dev
*dev
, struct vm_area_struct
*vma
,
599 enum pci_mmap_state mmap_state
)
601 /* Our io_remap_pfn_range takes care of this, do nothing. */
604 /* Perform the actual remap of the pages for a PCI device mapping, as appropriate
605 * for this architecture. The region in the process to map is described by vm_start
606 * and vm_end members of VMA, the base physical address is found in vm_pgoff.
607 * The pci device structure is provided so that architectures may make mapping
608 * decisions on a per-device or per-bus basis.
610 * Returns a negative error code on failure, zero on success.
612 int pci_mmap_page_range(struct pci_dev
*dev
, struct vm_area_struct
*vma
,
613 enum pci_mmap_state mmap_state
,
618 ret
= __pci_mmap_make_offset(dev
, vma
, mmap_state
);
622 __pci_mmap_set_flags(dev
, vma
, mmap_state
);
623 __pci_mmap_set_pgprot(dev
, vma
, mmap_state
);
625 vma
->vm_page_prot
= pgprot_noncached(vma
->vm_page_prot
);
626 ret
= io_remap_pfn_range(vma
, vma
->vm_start
,
628 vma
->vm_end
- vma
->vm_start
,
636 /* Return the domain nuber for this pci bus */
638 int pci_domain_nr(struct pci_bus
*pbus
)
640 struct pci_pbm_info
*pbm
= pbus
->sysdata
;
643 if (pbm
== NULL
|| pbm
->parent
== NULL
) {
646 struct pci_controller_info
*p
= pbm
->parent
;
649 if (p
->pbms_same_domain
== 0)
651 ((pbm
== &pbm
->parent
->pbm_B
) ? 1 : 0));
656 EXPORT_SYMBOL(pci_domain_nr
);
658 int pcibios_prep_mwi(struct pci_dev
*dev
)
660 /* We set correct PCI_CACHE_LINE_SIZE register values for every
661 * device probed on this platform. So there is nothing to check
662 * and this always succeeds.
667 #endif /* !(CONFIG_PCI) */