2 * Sonics Silicon Backplane
3 * Broadcom PCI-core driver
5 * Copyright 2005, Broadcom Corporation
6 * Copyright 2006, 2007, Michael Buesch <mb@bu3sch.de>
8 * Licensed under the GNU/GPL. See COPYING for details.
11 #include <linux/ssb/ssb.h>
12 #include <linux/pci.h>
13 #include <linux/delay.h>
14 #include <linux/ssb/ssb_embedded.h>
16 #include "ssb_private.h"
20 u32
pcicore_read32(struct ssb_pcicore
*pc
, u16 offset
)
22 return ssb_read32(pc
->dev
, offset
);
26 void pcicore_write32(struct ssb_pcicore
*pc
, u16 offset
, u32 value
)
28 ssb_write32(pc
->dev
, offset
, value
);
32 u16
pcicore_read16(struct ssb_pcicore
*pc
, u16 offset
)
34 return ssb_read16(pc
->dev
, offset
);
38 void pcicore_write16(struct ssb_pcicore
*pc
, u16 offset
, u16 value
)
40 ssb_write16(pc
->dev
, offset
, value
);
43 /**************************************************
44 * Code for hostmode operation.
45 **************************************************/
47 #ifdef CONFIG_SSB_PCICORE_HOSTMODE
49 #include <asm/paccess.h>
50 /* Probe a 32bit value on the bus and catch bus exceptions.
51 * Returns nonzero on a bus exception.
52 * This is MIPS specific */
53 #define mips_busprobe32(val, addr) get_dbe((val), ((u32 *)(addr)))
55 /* Assume one-hot slot wiring */
56 #define SSB_PCI_SLOT_MAX 16
58 /* Global lock is OK, as we won't have more than one extpci anyway. */
59 static DEFINE_SPINLOCK(cfgspace_lock
);
60 /* Core to access the external PCI config space. Can only have one. */
61 static struct ssb_pcicore
*extpci_core
;
64 static u32
get_cfgspace_addr(struct ssb_pcicore
*pc
,
65 unsigned int bus
, unsigned int dev
,
66 unsigned int func
, unsigned int off
)
71 /* We do only have one cardbus device behind the bridge. */
72 if (pc
->cardbusmode
&& (dev
>= 1))
76 /* Type 0 transaction */
77 if (unlikely(dev
>= SSB_PCI_SLOT_MAX
))
79 /* Slide the window */
80 tmp
= SSB_PCICORE_SBTOPCI_CFG0
;
81 tmp
|= ((1 << (dev
+ 16)) & SSB_PCICORE_SBTOPCI1_MASK
);
82 pcicore_write32(pc
, SSB_PCICORE_SBTOPCI1
, tmp
);
83 /* Calculate the address */
85 addr
|= ((1 << (dev
+ 16)) & ~SSB_PCICORE_SBTOPCI1_MASK
);
89 /* Type 1 transaction */
90 pcicore_write32(pc
, SSB_PCICORE_SBTOPCI1
,
91 SSB_PCICORE_SBTOPCI_CFG1
);
92 /* Calculate the address */
103 static int ssb_extpci_read_config(struct ssb_pcicore
*pc
,
104 unsigned int bus
, unsigned int dev
,
105 unsigned int func
, unsigned int off
,
112 SSB_WARN_ON(!pc
->hostmode
);
113 if (unlikely(len
!= 1 && len
!= 2 && len
!= 4))
115 addr
= get_cfgspace_addr(pc
, bus
, dev
, func
, off
);
119 mmio
= ioremap_nocache(addr
, len
);
123 if (mips_busprobe32(val
, mmio
)) {
129 val
>>= (8 * (off
& 3));
133 *((u8
*)buf
) = (u8
)val
;
136 *((u16
*)buf
) = (u16
)val
;
139 *((u32
*)buf
) = (u32
)val
;
149 static int ssb_extpci_write_config(struct ssb_pcicore
*pc
,
150 unsigned int bus
, unsigned int dev
,
151 unsigned int func
, unsigned int off
,
152 const void *buf
, int len
)
158 SSB_WARN_ON(!pc
->hostmode
);
159 if (unlikely(len
!= 1 && len
!= 2 && len
!= 4))
161 addr
= get_cfgspace_addr(pc
, bus
, dev
, func
, off
);
165 mmio
= ioremap_nocache(addr
, len
);
169 if (mips_busprobe32(val
, mmio
)) {
177 val
&= ~(0xFF << (8 * (off
& 3)));
178 val
|= *((const u8
*)buf
) << (8 * (off
& 3));
182 val
&= ~(0xFFFF << (8 * (off
& 3)));
183 val
|= *((const u16
*)buf
) << (8 * (off
& 3));
186 val
= *((const u32
*)buf
);
198 static int ssb_pcicore_read_config(struct pci_bus
*bus
, unsigned int devfn
,
199 int reg
, int size
, u32
*val
)
204 spin_lock_irqsave(&cfgspace_lock
, flags
);
205 err
= ssb_extpci_read_config(extpci_core
, bus
->number
, PCI_SLOT(devfn
),
206 PCI_FUNC(devfn
), reg
, val
, size
);
207 spin_unlock_irqrestore(&cfgspace_lock
, flags
);
209 return err
? PCIBIOS_DEVICE_NOT_FOUND
: PCIBIOS_SUCCESSFUL
;
212 static int ssb_pcicore_write_config(struct pci_bus
*bus
, unsigned int devfn
,
213 int reg
, int size
, u32 val
)
218 spin_lock_irqsave(&cfgspace_lock
, flags
);
219 err
= ssb_extpci_write_config(extpci_core
, bus
->number
, PCI_SLOT(devfn
),
220 PCI_FUNC(devfn
), reg
, &val
, size
);
221 spin_unlock_irqrestore(&cfgspace_lock
, flags
);
223 return err
? PCIBIOS_DEVICE_NOT_FOUND
: PCIBIOS_SUCCESSFUL
;
226 static struct pci_ops ssb_pcicore_pciops
= {
227 .read
= ssb_pcicore_read_config
,
228 .write
= ssb_pcicore_write_config
,
231 static struct resource ssb_pcicore_mem_resource
= {
232 .name
= "SSB PCIcore external memory",
233 .start
= SSB_PCI_DMA
,
234 .end
= SSB_PCI_DMA
+ SSB_PCI_DMA_SZ
- 1,
235 .flags
= IORESOURCE_MEM
| IORESOURCE_PCI_FIXED
,
238 static struct resource ssb_pcicore_io_resource
= {
239 .name
= "SSB PCIcore external I/O",
242 .flags
= IORESOURCE_IO
| IORESOURCE_PCI_FIXED
,
245 static struct pci_controller ssb_pcicore_controller
= {
246 .pci_ops
= &ssb_pcicore_pciops
,
247 .io_resource
= &ssb_pcicore_io_resource
,
248 .mem_resource
= &ssb_pcicore_mem_resource
,
249 .mem_offset
= 0x24000000,
252 static u32 ssb_pcicore_pcibus_iobase
= 0x100;
253 static u32 ssb_pcicore_pcibus_membase
= SSB_PCI_DMA
;
255 /* This function is called when doing a pci_enable_device().
256 * We must first check if the device is a device on the PCI-core bridge. */
257 int ssb_pcicore_plat_dev_init(struct pci_dev
*d
)
259 struct resource
*res
;
263 if (d
->bus
->ops
!= &ssb_pcicore_pciops
) {
264 /* This is not a device on the PCI-core bridge. */
268 ssb_printk(KERN_INFO
"PCI: Fixing up device %s\n",
271 /* Fix up resource bases */
272 for (pos
= 0; pos
< 6; pos
++) {
273 res
= &d
->resource
[pos
];
274 if (res
->flags
& IORESOURCE_IO
)
275 base
= &ssb_pcicore_pcibus_iobase
;
277 base
= &ssb_pcicore_pcibus_membase
;
278 res
->flags
|= IORESOURCE_PCI_FIXED
;
280 size
= res
->end
- res
->start
+ 1;
281 if (*base
& (size
- 1))
282 *base
= (*base
+ size
) & ~(size
- 1);
284 res
->end
= res
->start
+ size
- 1;
286 pci_write_config_dword(d
, PCI_BASE_ADDRESS_0
+ (pos
<< 2), res
->start
);
288 /* Fix up PCI bridge BAR0 only */
289 if (d
->bus
->number
== 0 && PCI_SLOT(d
->devfn
) == 0)
292 /* Fix up interrupt lines */
293 d
->irq
= ssb_mips_irq(extpci_core
->dev
) + 2;
294 pci_write_config_byte(d
, PCI_INTERRUPT_LINE
, d
->irq
);
299 /* Early PCI fixup for a device on the PCI-core bridge. */
300 static void ssb_pcicore_fixup_pcibridge(struct pci_dev
*dev
)
304 if (dev
->bus
->ops
!= &ssb_pcicore_pciops
) {
305 /* This is not a device on the PCI-core bridge. */
308 if (dev
->bus
->number
!= 0 || PCI_SLOT(dev
->devfn
) != 0)
311 ssb_printk(KERN_INFO
"PCI: Fixing up bridge %s\n", pci_name(dev
));
313 /* Enable PCI bridge bus mastering and memory space */
315 if (pcibios_enable_device(dev
, ~0) < 0) {
316 ssb_printk(KERN_ERR
"PCI: SSB bridge enable failed\n");
320 /* Enable PCI bridge BAR1 prefetch and burst */
321 pci_write_config_dword(dev
, SSB_BAR1_CONTROL
, 3);
323 /* Make sure our latency is high enough to handle the devices behind us */
325 ssb_printk(KERN_INFO
"PCI: Fixing latency timer of device %s to %u\n",
327 pci_write_config_byte(dev
, PCI_LATENCY_TIMER
, lat
);
329 DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID
, PCI_ANY_ID
, ssb_pcicore_fixup_pcibridge
);
331 /* PCI device IRQ mapping. */
332 int ssb_pcicore_pcibios_map_irq(const struct pci_dev
*dev
, u8 slot
, u8 pin
)
334 if (dev
->bus
->ops
!= &ssb_pcicore_pciops
) {
335 /* This is not a device on the PCI-core bridge. */
338 return ssb_mips_irq(extpci_core
->dev
) + 2;
341 static void ssb_pcicore_init_hostmode(struct ssb_pcicore
*pc
)
345 if (WARN_ON(extpci_core
))
349 ssb_dprintk(KERN_INFO PFX
"PCIcore in host mode found\n");
350 /* Reset devices on the external PCI bus */
351 val
= SSB_PCICORE_CTL_RST_OE
;
352 val
|= SSB_PCICORE_CTL_CLK_OE
;
353 pcicore_write32(pc
, SSB_PCICORE_CTL
, val
);
354 val
|= SSB_PCICORE_CTL_CLK
; /* Clock on */
355 pcicore_write32(pc
, SSB_PCICORE_CTL
, val
);
356 udelay(150); /* Assertion time demanded by the PCI standard */
357 val
|= SSB_PCICORE_CTL_RST
; /* Deassert RST# */
358 pcicore_write32(pc
, SSB_PCICORE_CTL
, val
);
359 val
= SSB_PCICORE_ARBCTL_INTERN
;
360 pcicore_write32(pc
, SSB_PCICORE_ARBCTL
, val
);
361 udelay(1); /* Assertion time demanded by the PCI standard */
363 if (pc
->dev
->bus
->has_cardbus_slot
) {
364 ssb_dprintk(KERN_INFO PFX
"CardBus slot detected\n");
366 /* GPIO 1 resets the bridge */
367 ssb_gpio_out(pc
->dev
->bus
, 1, 1);
368 ssb_gpio_outen(pc
->dev
->bus
, 1, 1);
369 pcicore_write16(pc
, SSB_PCICORE_SPROM(0),
370 pcicore_read16(pc
, SSB_PCICORE_SPROM(0))
374 /* 64MB I/O window */
375 pcicore_write32(pc
, SSB_PCICORE_SBTOPCI0
,
376 SSB_PCICORE_SBTOPCI_IO
);
377 /* 64MB config space */
378 pcicore_write32(pc
, SSB_PCICORE_SBTOPCI1
,
379 SSB_PCICORE_SBTOPCI_CFG0
);
380 /* 1GB memory window */
381 pcicore_write32(pc
, SSB_PCICORE_SBTOPCI2
,
382 SSB_PCICORE_SBTOPCI_MEM
| SSB_PCI_DMA
);
384 /* Enable PCI bridge BAR0 prefetch and burst */
385 val
= PCI_COMMAND_MASTER
| PCI_COMMAND_MEMORY
;
386 ssb_extpci_write_config(pc
, 0, 0, 0, PCI_COMMAND
, &val
, 2);
387 /* Clear error conditions */
389 ssb_extpci_write_config(pc
, 0, 0, 0, PCI_STATUS
, &val
, 2);
391 /* Enable PCI interrupts */
392 pcicore_write32(pc
, SSB_PCICORE_IMASK
,
393 SSB_PCICORE_IMASK_INTA
);
395 /* Ok, ready to run, register it to the system.
396 * The following needs change, if we want to port hostmode
397 * to non-MIPS platform. */
398 ssb_pcicore_controller
.io_map_base
= (unsigned long)ioremap_nocache(SSB_PCI_MEM
, 0x04000000);
399 set_io_port_base(ssb_pcicore_controller
.io_map_base
);
400 /* Give some time to the PCI controller to configure itself with the new
401 * values. Not waiting at this point causes crashes of the machine. */
403 register_pci_controller(&ssb_pcicore_controller
);
406 static int pcicore_is_in_hostmode(struct ssb_pcicore
*pc
)
408 struct ssb_bus
*bus
= pc
->dev
->bus
;
412 chipid_top
= (bus
->chip_id
& 0xFF00);
413 if (chipid_top
!= 0x4700 &&
414 chipid_top
!= 0x5300)
417 if (bus
->sprom
.boardflags_lo
& SSB_PCICORE_BFL_NOPCI
)
420 /* The 200-pin BCM4712 package does not bond out PCI. Even when
421 * PCI is bonded out, some boards may leave the pins floating. */
422 if (bus
->chip_id
== 0x4712) {
423 if (bus
->chip_package
== SSB_CHIPPACK_BCM4712S
)
425 if (bus
->chip_package
== SSB_CHIPPACK_BCM4712M
)
428 if (bus
->chip_id
== 0x5350)
431 return !mips_busprobe32(tmp
, (bus
->mmio
+ (pc
->dev
->core_index
* SSB_CORE_SIZE
)));
433 #endif /* CONFIG_SSB_PCICORE_HOSTMODE */
436 /**************************************************
437 * Generic and Clientmode operation code.
438 **************************************************/
440 static void ssb_pcicore_init_clientmode(struct ssb_pcicore
*pc
)
442 /* Disable PCI interrupts. */
443 ssb_write32(pc
->dev
, SSB_INTVEC
, 0);
446 void ssb_pcicore_init(struct ssb_pcicore
*pc
)
448 struct ssb_device
*dev
= pc
->dev
;
454 if (!ssb_device_is_enabled(dev
))
455 ssb_device_enable(dev
, 0);
457 #ifdef CONFIG_SSB_PCICORE_HOSTMODE
458 pc
->hostmode
= pcicore_is_in_hostmode(pc
);
460 ssb_pcicore_init_hostmode(pc
);
461 #endif /* CONFIG_SSB_PCICORE_HOSTMODE */
463 ssb_pcicore_init_clientmode(pc
);
466 static u32
ssb_pcie_read(struct ssb_pcicore
*pc
, u32 address
)
468 pcicore_write32(pc
, 0x130, address
);
469 return pcicore_read32(pc
, 0x134);
472 static void ssb_pcie_write(struct ssb_pcicore
*pc
, u32 address
, u32 data
)
474 pcicore_write32(pc
, 0x130, address
);
475 pcicore_write32(pc
, 0x134, data
);
478 static void ssb_pcie_mdio_write(struct ssb_pcicore
*pc
, u8 device
,
479 u8 address
, u16 data
)
481 const u16 mdio_control
= 0x128;
482 const u16 mdio_data
= 0x12C;
486 v
= 0x80; /* Enable Preamble Sequence */
487 v
|= 0x2; /* MDIO Clock Divisor */
488 pcicore_write32(pc
, mdio_control
, v
);
490 v
= (1 << 30); /* Start of Transaction */
491 v
|= (1 << 28); /* Write Transaction */
492 v
|= (1 << 17); /* Turnaround */
493 v
|= (u32
)device
<< 22;
494 v
|= (u32
)address
<< 18;
496 pcicore_write32(pc
, mdio_data
, v
);
497 /* Wait for the device to complete the transaction */
499 for (i
= 0; i
< 10; i
++) {
500 v
= pcicore_read32(pc
, mdio_control
);
501 if (v
& 0x100 /* Trans complete */)
505 pcicore_write32(pc
, mdio_control
, 0);
508 static void ssb_broadcast_value(struct ssb_device
*dev
,
509 u32 address
, u32 data
)
511 /* This is used for both, PCI and ChipCommon core, so be careful. */
512 BUILD_BUG_ON(SSB_PCICORE_BCAST_ADDR
!= SSB_CHIPCO_BCAST_ADDR
);
513 BUILD_BUG_ON(SSB_PCICORE_BCAST_DATA
!= SSB_CHIPCO_BCAST_DATA
);
515 ssb_write32(dev
, SSB_PCICORE_BCAST_ADDR
, address
);
516 ssb_read32(dev
, SSB_PCICORE_BCAST_ADDR
); /* flush */
517 ssb_write32(dev
, SSB_PCICORE_BCAST_DATA
, data
);
518 ssb_read32(dev
, SSB_PCICORE_BCAST_DATA
); /* flush */
521 static void ssb_commit_settings(struct ssb_bus
*bus
)
523 struct ssb_device
*dev
;
525 dev
= bus
->chipco
.dev
? bus
->chipco
.dev
: bus
->pcicore
.dev
;
528 /* This forces an update of the cached registers. */
529 ssb_broadcast_value(dev
, 0xFD8, 0);
532 int ssb_pcicore_dev_irqvecs_enable(struct ssb_pcicore
*pc
,
533 struct ssb_device
*dev
)
535 struct ssb_device
*pdev
= pc
->dev
;
546 /* Enable interrupts for this device. */
548 ((pdev
->id
.revision
>= 6) || (pdev
->id
.coreid
== SSB_DEV_PCIE
))) {
551 /* Calculate the "coremask" for the device. */
552 coremask
= (1 << dev
->core_index
);
554 err
= pci_read_config_dword(bus
->host_pci
, SSB_PCI_IRQMASK
, &tmp
);
557 tmp
|= coremask
<< 8;
558 err
= pci_write_config_dword(bus
->host_pci
, SSB_PCI_IRQMASK
, tmp
);
564 intvec
= ssb_read32(pdev
, SSB_INTVEC
);
565 if ((bus
->chip_id
& 0xFF00) == 0x4400) {
566 /* Workaround: On the BCM44XX the BPFLAG routing
567 * bit is wrong. Use a hardcoded constant. */
568 intvec
|= 0x00000002;
570 tmp
= ssb_read32(dev
, SSB_TPSFLAG
);
571 tmp
&= SSB_TPSFLAG_BPFLAG
;
574 ssb_write32(pdev
, SSB_INTVEC
, intvec
);
577 /* Setup PCIcore operation. */
580 if (pdev
->id
.coreid
== SSB_DEV_PCI
) {
581 tmp
= pcicore_read32(pc
, SSB_PCICORE_SBTOPCI2
);
582 tmp
|= SSB_PCICORE_SBTOPCI_PREF
;
583 tmp
|= SSB_PCICORE_SBTOPCI_BURST
;
584 pcicore_write32(pc
, SSB_PCICORE_SBTOPCI2
, tmp
);
586 if (pdev
->id
.revision
< 5) {
587 tmp
= ssb_read32(pdev
, SSB_IMCFGLO
);
588 tmp
&= ~SSB_IMCFGLO_SERTO
;
590 tmp
&= ~SSB_IMCFGLO_REQTO
;
591 tmp
|= 3 << SSB_IMCFGLO_REQTO_SHIFT
;
592 ssb_write32(pdev
, SSB_IMCFGLO
, tmp
);
593 ssb_commit_settings(bus
);
594 } else if (pdev
->id
.revision
>= 11) {
595 tmp
= pcicore_read32(pc
, SSB_PCICORE_SBTOPCI2
);
596 tmp
|= SSB_PCICORE_SBTOPCI_MRM
;
597 pcicore_write32(pc
, SSB_PCICORE_SBTOPCI2
, tmp
);
600 WARN_ON(pdev
->id
.coreid
!= SSB_DEV_PCIE
);
601 //TODO: Better make defines for all these magic PCIE values.
602 if ((pdev
->id
.revision
== 0) || (pdev
->id
.revision
== 1)) {
603 /* TLP Workaround register. */
604 tmp
= ssb_pcie_read(pc
, 0x4);
606 ssb_pcie_write(pc
, 0x4, tmp
);
608 if (pdev
->id
.revision
== 0) {
609 const u8 serdes_rx_device
= 0x1F;
611 ssb_pcie_mdio_write(pc
, serdes_rx_device
,
612 2 /* Timer */, 0x8128);
613 ssb_pcie_mdio_write(pc
, serdes_rx_device
,
614 6 /* CDR */, 0x0100);
615 ssb_pcie_mdio_write(pc
, serdes_rx_device
,
616 7 /* CDR BW */, 0x1466);
617 } else if (pdev
->id
.revision
== 1) {
618 /* DLLP Link Control register. */
619 tmp
= ssb_pcie_read(pc
, 0x100);
621 ssb_pcie_write(pc
, 0x100, tmp
);
628 EXPORT_SYMBOL(ssb_pcicore_dev_irqvecs_enable
);