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Merge tag 'bcachefs-2024-09-09' of git://evilpiepirate.org/bcachefs
[linux-block.git] / drivers / ssb / driver_pcicore.c
CommitLineData
61e115a5
MB		 1/*
2 * Sonics Silicon Backplane
3 * Broadcom PCI-core driver
4 *
5 * Copyright 2005, Broadcom Corporation
eb032b98 6 * Copyright 2006, 2007, Michael Buesch <m@bues.ch>
61e115a5
MB		 7 *
8 * Licensed under the GNU/GPL. See COPYING for details.
9 */
10
b8b6069c
MB		 11#include "ssb_private.h"
12
61e115a5
MB		 13#include <linux/ssb/ssb.h>
14#include <linux/pci.h>
1014c22e 15#include <linux/export.h>
61e115a5 16#include <linux/delay.h>
7cb44615 17#include <linux/ssb/ssb_embedded.h>
61e115a5 18
ccc7c28a
RM		 19static u32 ssb_pcie_read(struct ssb_pcicore *pc, u32 address);
20static void ssb_pcie_write(struct ssb_pcicore *pc, u32 address, u32 data);
21static u16 ssb_pcie_mdio_read(struct ssb_pcicore *pc, u8 device, u8 address);
22static void ssb_pcie_mdio_write(struct ssb_pcicore *pc, u8 device,
23 u8 address, u16 data);
61e115a5
MB		 24
25static inline
26u32 pcicore_read32(struct ssb_pcicore *pc, u16 offset)
27{
28 return ssb_read32(pc->dev, offset);
29}
30
31static inline
32void pcicore_write32(struct ssb_pcicore *pc, u16 offset, u32 value)
33{
34 ssb_write32(pc->dev, offset, value);
35}
36
7cb44615
MB		 37static inline
38u16 pcicore_read16(struct ssb_pcicore *pc, u16 offset)
39{
40 return ssb_read16(pc->dev, offset);
41}
42
43static inline
44void pcicore_write16(struct ssb_pcicore *pc, u16 offset, u16 value)
45{
46 ssb_write16(pc->dev, offset, value);
47}
48
61e115a5
MB		 49/**************************************************
50 * Code for hostmode operation.
51 **************************************************/
52
53#ifdef CONFIG_SSB_PCICORE_HOSTMODE
54
55#include <asm/paccess.h>
56/* Probe a 32bit value on the bus and catch bus exceptions.
57 * Returns nonzero on a bus exception.
2a3d830f
SK		 58 * This is MIPS specific
59 */
61e115a5
MB		 60#define mips_busprobe32(val, addr) get_dbe((val), ((u32 *)(addr)))
61
62/* Assume one-hot slot wiring */
63#define SSB_PCI_SLOT_MAX 16
64
65/* Global lock is OK, as we won't have more than one extpci anyway. */
66static DEFINE_SPINLOCK(cfgspace_lock);
67/* Core to access the external PCI config space. Can only have one. */
68static struct ssb_pcicore *extpci_core;
69
61e115a5
MB		 70
71static u32 get_cfgspace_addr(struct ssb_pcicore *pc,
72 unsigned int bus, unsigned int dev,
73 unsigned int func, unsigned int off)
74{
75 u32 addr = 0;
76 u32 tmp;
77
7cb44615 78 /* We do only have one cardbus device behind the bridge. */
a6c84622 79 if (pc->cardbusmode && (dev > 1))
61e115a5 80 goto out;
7cb44615 81
61e115a5
MB		 82 if (bus == 0) {
83 /* Type 0 transaction */
84 if (unlikely(dev >= SSB_PCI_SLOT_MAX))
85 goto out;
86 /* Slide the window */
87 tmp = SSB_PCICORE_SBTOPCI_CFG0;
88 tmp |= ((1 << (dev + 16)) & SSB_PCICORE_SBTOPCI1_MASK);
89 pcicore_write32(pc, SSB_PCICORE_SBTOPCI1, tmp);
90 /* Calculate the address */
91 addr = SSB_PCI_CFG;
92 addr |= ((1 << (dev + 16)) & ~SSB_PCICORE_SBTOPCI1_MASK);
93 addr |= (func << 8);
94 addr |= (off & ~3);
95 } else {
96 /* Type 1 transaction */
97 pcicore_write32(pc, SSB_PCICORE_SBTOPCI1,
98 SSB_PCICORE_SBTOPCI_CFG1);
99 /* Calculate the address */
100 addr = SSB_PCI_CFG;
101 addr |= (bus << 16);
102 addr |= (dev << 11);
103 addr |= (func << 8);
104 addr |= (off & ~3);
105 }
106out:
107 return addr;
108}
109
110static int ssb_extpci_read_config(struct ssb_pcicore *pc,
111 unsigned int bus, unsigned int dev,
112 unsigned int func, unsigned int off,
113 void *buf, int len)
114{
115 int err = -EINVAL;
116 u32 addr, val;
117 void __iomem *mmio;
118
209b4375 119 WARN_ON(!pc->hostmode);
61e115a5
MB		 120 if (unlikely(len != 1 && len != 2 && len != 4))
121 goto out;
122 addr = get_cfgspace_addr(pc, bus, dev, func, off);
123 if (unlikely(!addr))
124 goto out;
125 err = -ENOMEM;
4bdc0d67 126 mmio = ioremap(addr, len);
61e115a5
MB		 127 if (!mmio)
128 goto out;
129
130 if (mips_busprobe32(val, mmio)) {
131 val = 0xffffffff;
132 goto unmap;
133 }
134
135 val = readl(mmio);
136 val >>= (8 * (off & 3));
137
138 switch (len) {
139 case 1:
140 *((u8 *)buf) = (u8)val;
141 break;
142 case 2:
143 *((u16 *)buf) = (u16)val;
144 break;
145 case 4:
146 *((u32 *)buf) = (u32)val;
147 break;
148 }
149 err = 0;
150unmap:
151 iounmap(mmio);
152out:
153 return err;
154}
155
156static int ssb_extpci_write_config(struct ssb_pcicore *pc,
157 unsigned int bus, unsigned int dev,
158 unsigned int func, unsigned int off,
159 const void *buf, int len)
160{
161 int err = -EINVAL;
162 u32 addr, val = 0;
163 void __iomem *mmio;
164
209b4375 165 WARN_ON(!pc->hostmode);
61e115a5
MB		 166 if (unlikely(len != 1 && len != 2 && len != 4))
167 goto out;
168 addr = get_cfgspace_addr(pc, bus, dev, func, off);
169 if (unlikely(!addr))
170 goto out;
171 err = -ENOMEM;
4bdc0d67 172 mmio = ioremap(addr, len);
61e115a5
MB		 173 if (!mmio)
174 goto out;
175
176 if (mips_busprobe32(val, mmio)) {
177 val = 0xffffffff;
178 goto unmap;
179 }
180
181 switch (len) {
182 case 1:
183 val = readl(mmio);
184 val &= ~(0xFF << (8 * (off & 3)));
185 val |= *((const u8 *)buf) << (8 * (off & 3));
186 break;
187 case 2:
188 val = readl(mmio);
189 val &= ~(0xFFFF << (8 * (off & 3)));
190 val |= *((const u16 *)buf) << (8 * (off & 3));
191 break;
192 case 4:
193 val = *((const u32 *)buf);
194 break;
195 }
196 writel(val, mmio);
197
198 err = 0;
199unmap:
200 iounmap(mmio);
201out:
202 return err;
203}
204
205static int ssb_pcicore_read_config(struct pci_bus *bus, unsigned int devfn,
206 int reg, int size, u32 *val)
207{
208 unsigned long flags;
209 int err;
210
211 spin_lock_irqsave(&cfgspace_lock, flags);
212 err = ssb_extpci_read_config(extpci_core, bus->number, PCI_SLOT(devfn),
213 PCI_FUNC(devfn), reg, val, size);
214 spin_unlock_irqrestore(&cfgspace_lock, flags);
215
216 return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
217}
218
219static int ssb_pcicore_write_config(struct pci_bus *bus, unsigned int devfn,
220 int reg, int size, u32 val)
221{
222 unsigned long flags;
223 int err;
224
225 spin_lock_irqsave(&cfgspace_lock, flags);
226 err = ssb_extpci_write_config(extpci_core, bus->number, PCI_SLOT(devfn),
227 PCI_FUNC(devfn), reg, &val, size);
228 spin_unlock_irqrestore(&cfgspace_lock, flags);
229
230 return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
231}
232
233static struct pci_ops ssb_pcicore_pciops = {
234 .read = ssb_pcicore_read_config,
235 .write = ssb_pcicore_write_config,
236};
237
238static struct resource ssb_pcicore_mem_resource = {
239 .name = "SSB PCIcore external memory",
240 .start = SSB_PCI_DMA,
241 .end = SSB_PCI_DMA + SSB_PCI_DMA_SZ - 1,
fc71acc8 242 .flags = IORESOURCE_MEM | IORESOURCE_PCI_FIXED,
61e115a5
MB		 243};
244
245static struct resource ssb_pcicore_io_resource = {
246 .name = "SSB PCIcore external I/O",
247 .start = 0x100,
248 .end = 0x7FF,
fc71acc8 249 .flags = IORESOURCE_IO | IORESOURCE_PCI_FIXED,
61e115a5
MB		 250};
251
252static struct pci_controller ssb_pcicore_controller = {
253 .pci_ops = &ssb_pcicore_pciops,
254 .io_resource = &ssb_pcicore_io_resource,
255 .mem_resource = &ssb_pcicore_mem_resource,
61e115a5
MB		 256};
257
aab547ce 258/* This function is called when doing a pci_enable_device().
2a3d830f
SK		 259 * We must first check if the device is a device on the PCI-core bridge.
260 */
aab547ce
MB		 261int ssb_pcicore_plat_dev_init(struct pci_dev *d)
262{
aab547ce
MB		 263 if (d->bus->ops != &ssb_pcicore_pciops) {
264 /* This is not a device on the PCI-core bridge. */
265 return -ENODEV;
266 }
267
b8b6069c 268 dev_info(&d->dev, "PCI: Fixing up device %s\n", pci_name(d));
aab547ce 269
aab547ce
MB		 270 /* Fix up interrupt lines */
271 d->irq = ssb_mips_irq(extpci_core->dev) + 2;
272 pci_write_config_byte(d, PCI_INTERRUPT_LINE, d->irq);
273
274 return 0;
275}
276
277/* Early PCI fixup for a device on the PCI-core bridge. */
278static void ssb_pcicore_fixup_pcibridge(struct pci_dev *dev)
279{
280 u8 lat;
281
282 if (dev->bus->ops != &ssb_pcicore_pciops) {
283 /* This is not a device on the PCI-core bridge. */
284 return;
285 }
286 if (dev->bus->number != 0 || PCI_SLOT(dev->devfn) != 0)
287 return;
288
b8b6069c 289 dev_info(&dev->dev, "PCI: Fixing up bridge %s\n", pci_name(dev));
aab547ce
MB		 290
291 /* Enable PCI bridge bus mastering and memory space */
292 pci_set_master(dev);
293 if (pcibios_enable_device(dev, ~0) < 0) {
b8b6069c 294 dev_err(&dev->dev, "PCI: SSB bridge enable failed\n");
aab547ce
MB		 295 return;
296 }
297
298 /* Enable PCI bridge BAR1 prefetch and burst */
299 pci_write_config_dword(dev, SSB_BAR1_CONTROL, 3);
300
301 /* Make sure our latency is high enough to handle the devices behind us */
302 lat = 168;
b8b6069c
MB		 303 dev_info(&dev->dev,
304 "PCI: Fixing latency timer of device %s to %u\n",
33a606ac 305 pci_name(dev), lat);
aab547ce
MB		 306 pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
307}
308DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ssb_pcicore_fixup_pcibridge);
309
310/* PCI device IRQ mapping. */
311int ssb_pcicore_pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
312{
313 if (dev->bus->ops != &ssb_pcicore_pciops) {
314 /* This is not a device on the PCI-core bridge. */
315 return -ENODEV;
316 }
317 return ssb_mips_irq(extpci_core->dev) + 2;
318}
319
163247c1 320static void ssb_pcicore_init_hostmode(struct ssb_pcicore *pc)
61e115a5
MB		 321{
322 u32 val;
323
324 if (WARN_ON(extpci_core))
325 return;
326 extpci_core = pc;
327
b8b6069c 328 dev_dbg(pc->dev->dev, "PCIcore in host mode found\n");
61e115a5
MB		 329 /* Reset devices on the external PCI bus */
330 val = SSB_PCICORE_CTL_RST_OE;
331 val |= SSB_PCICORE_CTL_CLK_OE;
332 pcicore_write32(pc, SSB_PCICORE_CTL, val);
333 val |= SSB_PCICORE_CTL_CLK; /* Clock on */
334 pcicore_write32(pc, SSB_PCICORE_CTL, val);
335 udelay(150); /* Assertion time demanded by the PCI standard */
336 val |= SSB_PCICORE_CTL_RST; /* Deassert RST# */
337 pcicore_write32(pc, SSB_PCICORE_CTL, val);
338 val = SSB_PCICORE_ARBCTL_INTERN;
339 pcicore_write32(pc, SSB_PCICORE_ARBCTL, val);
340 udelay(1); /* Assertion time demanded by the PCI standard */
341
7cb44615 342 if (pc->dev->bus->has_cardbus_slot) {
b8b6069c 343 dev_dbg(pc->dev->dev, "CardBus slot detected\n");
7cb44615
MB		 344 pc->cardbusmode = 1;
345 /* GPIO 1 resets the bridge */
346 ssb_gpio_out(pc->dev->bus, 1, 1);
347 ssb_gpio_outen(pc->dev->bus, 1, 1);
348 pcicore_write16(pc, SSB_PCICORE_SPROM(0),
349 pcicore_read16(pc, SSB_PCICORE_SPROM(0))
350 | 0x0400);
351 }
61e115a5
MB		 352
353 /* 64MB I/O window */
354 pcicore_write32(pc, SSB_PCICORE_SBTOPCI0,
355 SSB_PCICORE_SBTOPCI_IO);
356 /* 64MB config space */
357 pcicore_write32(pc, SSB_PCICORE_SBTOPCI1,
358 SSB_PCICORE_SBTOPCI_CFG0);
359 /* 1GB memory window */
360 pcicore_write32(pc, SSB_PCICORE_SBTOPCI2,
361 SSB_PCICORE_SBTOPCI_MEM | SSB_PCI_DMA);
362
f56d9e23
RM		 363 /*
364 * Accessing PCI config without a proper delay after devices reset (not
c411ead9 365 * GPIO reset) was causing reboots on WRT300N v1.0 (BCM4704).
f56d9e23
RM		 366 * Tested delay 850 us lowered reboot chance to 50-80%, 1000 us fixed it
367 * completely. Flushing all writes was also tested but with no luck.
c411ead9
RM		 368 * The same problem was reported for WRT350N v1 (BCM4705), so we just
369 * sleep here unconditionally.
f56d9e23 370 */
c411ead9 371 usleep_range(1000, 2000);
f56d9e23 372
61e115a5
MB		 373 /* Enable PCI bridge BAR0 prefetch and burst */
374 val = PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
375 ssb_extpci_write_config(pc, 0, 0, 0, PCI_COMMAND, &val, 2);
376 /* Clear error conditions */
377 val = 0;
378 ssb_extpci_write_config(pc, 0, 0, 0, PCI_STATUS, &val, 2);
379
380 /* Enable PCI interrupts */
381 pcicore_write32(pc, SSB_PCICORE_IMASK,
382 SSB_PCICORE_IMASK_INTA);
383
384 /* Ok, ready to run, register it to the system.
385 * The following needs change, if we want to port hostmode
2a3d830f
SK		 386 * to non-MIPS platform.
387 */
4bdc0d67 388 ssb_pcicore_controller.io_map_base = (unsigned long)ioremap(SSB_PCI_MEM, 0x04000000);
fc71acc8 389 set_io_port_base(ssb_pcicore_controller.io_map_base);
61e115a5 390 /* Give some time to the PCI controller to configure itself with the new
2a3d830f
SK		 391 * values. Not waiting at this point causes crashes of the machine.
392 */
61e115a5
MB		 393 mdelay(10);
394 register_pci_controller(&ssb_pcicore_controller);
395}
396
163247c1 397static int pcicore_is_in_hostmode(struct ssb_pcicore *pc)
61e115a5
MB		 398{
399 struct ssb_bus *bus = pc->dev->bus;
400 u16 chipid_top;
401 u32 tmp;
402
403 chipid_top = (bus->chip_id & 0xFF00);
404 if (chipid_top != 0x4700 &&
405 chipid_top != 0x5300)
406 return 0;
407
2d8d4fdf 408 if (bus->sprom.boardflags_lo & SSB_PCICORE_BFL_NOPCI)
61e115a5
MB		 409 return 0;
410
411 /* The 200-pin BCM4712 package does not bond out PCI. Even when
2a3d830f
SK		 412 * PCI is bonded out, some boards may leave the pins floating.
413 */
61e115a5
MB		 414 if (bus->chip_id == 0x4712) {
415 if (bus->chip_package == SSB_CHIPPACK_BCM4712S)
416 return 0;
417 if (bus->chip_package == SSB_CHIPPACK_BCM4712M)
418 return 0;
419 }
420 if (bus->chip_id == 0x5350)
421 return 0;
422
423 return !mips_busprobe32(tmp, (bus->mmio + (pc->dev->core_index * SSB_CORE_SIZE)));
424}
425#endif /* CONFIG_SSB_PCICORE_HOSTMODE */
426
ccc7c28a
RM		 427/**************************************************
428 * Workarounds.
429 **************************************************/
430
163247c1 431static void ssb_pcicore_fix_sprom_core_index(struct ssb_pcicore *pc)
af335a6c
RM		 432{
433 u16 tmp = pcicore_read16(pc, SSB_PCICORE_SPROM(0));
434 if (((tmp & 0xF000) >> 12) != pc->dev->core_index) {
435 tmp &= ~0xF000;
436 tmp |= (pc->dev->core_index << 12);
437 pcicore_write16(pc, SSB_PCICORE_SPROM(0), tmp);
438 }
439}
440
ccc7c28a
RM		 441static u8 ssb_pcicore_polarity_workaround(struct ssb_pcicore *pc)
442{
443 return (ssb_pcie_read(pc, 0x204) & 0x10) ? 0xC0 : 0x80;
444}
445
446static void ssb_pcicore_serdes_workaround(struct ssb_pcicore *pc)
447{
448 const u8 serdes_pll_device = 0x1D;
449 const u8 serdes_rx_device = 0x1F;
450 u16 tmp;
451
452 ssb_pcie_mdio_write(pc, serdes_rx_device, 1 /* Control */,
453 ssb_pcicore_polarity_workaround(pc));
454 tmp = ssb_pcie_mdio_read(pc, serdes_pll_device, 1 /* Control */);
455 if (tmp & 0x4000)
456 ssb_pcie_mdio_write(pc, serdes_pll_device, 1, tmp & ~0x4000);
457}
61e115a5 458
6e914101
RM		 459static void ssb_pcicore_pci_setup_workarounds(struct ssb_pcicore *pc)
460{
461 struct ssb_device *pdev = pc->dev;
462 struct ssb_bus *bus = pdev->bus;
463 u32 tmp;
464
465 tmp = pcicore_read32(pc, SSB_PCICORE_SBTOPCI2);
466 tmp |= SSB_PCICORE_SBTOPCI_PREF;
467 tmp |= SSB_PCICORE_SBTOPCI_BURST;
468 pcicore_write32(pc, SSB_PCICORE_SBTOPCI2, tmp);
469
470 if (pdev->id.revision < 5) {
471 tmp = ssb_read32(pdev, SSB_IMCFGLO);
472 tmp &= ~SSB_IMCFGLO_SERTO;
473 tmp |= 2;
474 tmp &= ~SSB_IMCFGLO_REQTO;
475 tmp |= 3 << SSB_IMCFGLO_REQTO_SHIFT;
476 ssb_write32(pdev, SSB_IMCFGLO, tmp);
477 ssb_commit_settings(bus);
478 } else if (pdev->id.revision >= 11) {
479 tmp = pcicore_read32(pc, SSB_PCICORE_SBTOPCI2);
480 tmp |= SSB_PCICORE_SBTOPCI_MRM;
481 pcicore_write32(pc, SSB_PCICORE_SBTOPCI2, tmp);
482 }
483}
484
485static void ssb_pcicore_pcie_setup_workarounds(struct ssb_pcicore *pc)
486{
6e914101 487 u32 tmp;
5890a3ca 488 u8 rev = pc->dev->id.revision;
6e914101 489
5890a3ca 490 if (rev == 0 || rev == 1) {
6e914101
RM		 491 /* TLP Workaround register. */
492 tmp = ssb_pcie_read(pc, 0x4);
493 tmp |= 0x8;
494 ssb_pcie_write(pc, 0x4, tmp);
495 }
5890a3ca
RM		 496 if (rev == 1) {
497 /* DLLP Link Control register. */
498 tmp = ssb_pcie_read(pc, 0x100);
499 tmp |= 0x40;
500 ssb_pcie_write(pc, 0x100, tmp);
501 }
502
503 if (rev == 0) {
6e914101
RM		 504 const u8 serdes_rx_device = 0x1F;
505
506 ssb_pcie_mdio_write(pc, serdes_rx_device,
507 2 /* Timer */, 0x8128);
508 ssb_pcie_mdio_write(pc, serdes_rx_device,
509 6 /* CDR */, 0x0100);
510 ssb_pcie_mdio_write(pc, serdes_rx_device,
511 7 /* CDR BW */, 0x1466);
5890a3ca
RM		 512 } else if (rev == 3 || rev == 4 || rev == 5) {
513 /* TODO: DLLP Power Management Threshold */
514 ssb_pcicore_serdes_workaround(pc);
515 /* TODO: ASPM */
516 } else if (rev == 7) {
517 /* TODO: No PLL down */
518 }
519
520 if (rev >= 6) {
521 /* Miscellaneous Configuration Fixup */
522 tmp = pcicore_read16(pc, SSB_PCICORE_SPROM(5));
523 if (!(tmp & 0x8000))
524 pcicore_write16(pc, SSB_PCICORE_SPROM(5),
525 tmp | 0x8000);
6e914101
RM		 526 }
527}
528
61e115a5
MB		 529/**************************************************
530 * Generic and Clientmode operation code.
531 **************************************************/
532
163247c1 533static void ssb_pcicore_init_clientmode(struct ssb_pcicore *pc)
61e115a5 534{
329456d1
HM		 535 struct ssb_device *pdev = pc->dev;
536 struct ssb_bus *bus = pdev->bus;
537
538 if (bus->bustype == SSB_BUSTYPE_PCI)
539 ssb_pcicore_fix_sprom_core_index(pc);
6ae8ec27 540
61e115a5 541 /* Disable PCI interrupts. */
329456d1 542 ssb_write32(pdev, SSB_INTVEC, 0);
6ae8ec27
RM		 543
544 /* Additional PCIe always once-executed workarounds */
545 if (pc->dev->id.coreid == SSB_DEV_PCIE) {
546 ssb_pcicore_serdes_workaround(pc);
547 /* TODO: ASPM */
548 /* TODO: Clock Request Update */
549 }
61e115a5
MB		 550}
551
163247c1 552void ssb_pcicore_init(struct ssb_pcicore *pc)
61e115a5
MB		 553{
554 struct ssb_device *dev = pc->dev;
61e115a5
MB		 555
556 if (!dev)
557 return;
61e115a5
MB		 558 if (!ssb_device_is_enabled(dev))
559 ssb_device_enable(dev, 0);
560
561#ifdef CONFIG_SSB_PCICORE_HOSTMODE
562 pc->hostmode = pcicore_is_in_hostmode(pc);
563 if (pc->hostmode)
564 ssb_pcicore_init_hostmode(pc);
565#endif /* CONFIG_SSB_PCICORE_HOSTMODE */
566 if (!pc->hostmode)
567 ssb_pcicore_init_clientmode(pc);
568}
569
570static u32 ssb_pcie_read(struct ssb_pcicore *pc, u32 address)
571{
572 pcicore_write32(pc, 0x130, address);
573 return pcicore_read32(pc, 0x134);
574}
575
576static void ssb_pcie_write(struct ssb_pcicore *pc, u32 address, u32 data)
577{
578 pcicore_write32(pc, 0x130, address);
579 pcicore_write32(pc, 0x134, data);
580}
581
1b1c7acd
RM		 582static void ssb_pcie_mdio_set_phy(struct ssb_pcicore *pc, u8 phy)
583{
584 const u16 mdio_control = 0x128;
585 const u16 mdio_data = 0x12C;
586 u32 v;
587 int i;
588
589 v = (1 << 30); /* Start of Transaction */
590 v |= (1 << 28); /* Write Transaction */
591 v |= (1 << 17); /* Turnaround */
592 v |= (0x1F << 18);
593 v |= (phy << 4);
594 pcicore_write32(pc, mdio_data, v);
595
596 udelay(10);
597 for (i = 0; i < 200; i++) {
598 v = pcicore_read32(pc, mdio_control);
599 if (v & 0x100 /* Trans complete */)
600 break;
601 msleep(1);
602 }
603}
604
ba91d1a1
RM		 605static u16 ssb_pcie_mdio_read(struct ssb_pcicore *pc, u8 device, u8 address)
606{
607 const u16 mdio_control = 0x128;
608 const u16 mdio_data = 0x12C;
609 int max_retries = 10;
610 u16 ret = 0;
611 u32 v;
612 int i;
613
614 v = 0x80; /* Enable Preamble Sequence */
615 v |= 0x2; /* MDIO Clock Divisor */
616 pcicore_write32(pc, mdio_control, v);
617
618 if (pc->dev->id.revision >= 10) {
619 max_retries = 200;
620 ssb_pcie_mdio_set_phy(pc, device);
621 }
622
623 v = (1 << 30); /* Start of Transaction */
624 v |= (1 << 29); /* Read Transaction */
625 v |= (1 << 17); /* Turnaround */
626 if (pc->dev->id.revision < 10)
627 v |= (u32)device << 22;
628 v |= (u32)address << 18;
629 pcicore_write32(pc, mdio_data, v);
630 /* Wait for the device to complete the transaction */
631 udelay(10);
9be1cb39 632 for (i = 0; i < max_retries; i++) {
ba91d1a1
RM		 633 v = pcicore_read32(pc, mdio_control);
634 if (v & 0x100 /* Trans complete */) {
635 udelay(10);
636 ret = pcicore_read32(pc, mdio_data);
637 break;
638 }
639 msleep(1);
640 }
641 pcicore_write32(pc, mdio_control, 0);
642 return ret;
643}
ba91d1a1 644
61e115a5
MB		 645static void ssb_pcie_mdio_write(struct ssb_pcicore *pc, u8 device,
646 u8 address, u16 data)
647{
648 const u16 mdio_control = 0x128;
649 const u16 mdio_data = 0x12C;
1b1c7acd 650 int max_retries = 10;
61e115a5
MB		 651 u32 v;
652 int i;
653
654 v = 0x80; /* Enable Preamble Sequence */
655 v |= 0x2; /* MDIO Clock Divisor */
656 pcicore_write32(pc, mdio_control, v);
657
1b1c7acd
RM		 658 if (pc->dev->id.revision >= 10) {
659 max_retries = 200;
660 ssb_pcie_mdio_set_phy(pc, device);
661 }
662
61e115a5
MB		 663 v = (1 << 30); /* Start of Transaction */
664 v |= (1 << 28); /* Write Transaction */
665 v |= (1 << 17); /* Turnaround */
1b1c7acd
RM		 666 if (pc->dev->id.revision < 10)
667 v |= (u32)device << 22;
61e115a5
MB		 668 v |= (u32)address << 18;
669 v |= data;
670 pcicore_write32(pc, mdio_data, v);
671 /* Wait for the device to complete the transaction */
672 udelay(10);
1b1c7acd 673 for (i = 0; i < max_retries; i++) {
61e115a5
MB		 674 v = pcicore_read32(pc, mdio_control);
675 if (v & 0x100 /* Trans complete */)
676 break;
677 msleep(1);
678 }
679 pcicore_write32(pc, mdio_control, 0);
680}
681
61e115a5
MB		 682int ssb_pcicore_dev_irqvecs_enable(struct ssb_pcicore *pc,
683 struct ssb_device *dev)
684{
685 struct ssb_device *pdev = pc->dev;
686 struct ssb_bus *bus;
687 int err = 0;
688 u32 tmp;
689
9e095a68
MB		 690 if (dev->bus->bustype != SSB_BUSTYPE_PCI) {
691 /* This SSB device is not on a PCI host-bus. So the IRQs are
692 * not routed through the PCI core.
2a3d830f
SK		 693 * So we must not enable routing through the PCI core.
694 */
9e095a68
MB		 695 goto out;
696 }
697
61e115a5
MB		 698 if (!pdev)
699 goto out;
700 bus = pdev->bus;
701
a3bafeed
MB		 702 might_sleep_if(pdev->id.coreid != SSB_DEV_PCI);
703
61e115a5 704 /* Enable interrupts for this device. */
8b45499c 705 if ((pdev->id.revision >= 6) || (pdev->id.coreid == SSB_DEV_PCIE)) {
61e115a5
MB		 706 u32 coremask;
707
708 /* Calculate the "coremask" for the device. */
709 coremask = (1 << dev->core_index);
710
209b4375 711 WARN_ON(bus->bustype != SSB_BUSTYPE_PCI);
61e115a5
MB		 712 err = pci_read_config_dword(bus->host_pci, SSB_PCI_IRQMASK, &tmp);
713 if (err)
714 goto out;
715 tmp |= coremask << 8;
716 err = pci_write_config_dword(bus->host_pci, SSB_PCI_IRQMASK, tmp);
717 if (err)
718 goto out;
719 } else {
720 u32 intvec;
721
722 intvec = ssb_read32(pdev, SSB_INTVEC);
51e8b885
MB		 723 tmp = ssb_read32(dev, SSB_TPSFLAG);
724 tmp &= SSB_TPSFLAG_BPFLAG;
725 intvec |= (1 << tmp);
61e115a5
MB		 726 ssb_write32(pdev, SSB_INTVEC, intvec);
727 }
728
729 /* Setup PCIcore operation. */
730 if (pc->setup_done)
731 goto out;
732 if (pdev->id.coreid == SSB_DEV_PCI) {
6e914101 733 ssb_pcicore_pci_setup_workarounds(pc);
61e115a5
MB		 734 } else {
735 WARN_ON(pdev->id.coreid != SSB_DEV_PCIE);
6e914101 736 ssb_pcicore_pcie_setup_workarounds(pc);
61e115a5
MB		 737 }
738 pc->setup_done = 1;
739out:
740 return err;
741}
742EXPORT_SYMBOL(ssb_pcicore_dev_irqvecs_enable);
Linux 6.x block layer and io_uring tree(s)