xref: /linux/drivers/ssb/driver_pcicore.c (revision 762f99f4f3cb41a775b5157dd761217beba65873)
1 /*
2  * Sonics Silicon Backplane
3  * Broadcom PCI-core driver
4  *
5  * Copyright 2005, Broadcom Corporation
6  * Copyright 2006, 2007, Michael Buesch <m@bues.ch>
7  *
8  * Licensed under the GNU/GPL. See COPYING for details.
9  */
10 
11 #include "ssb_private.h"
12 
13 #include <linux/ssb/ssb.h>
14 #include <linux/pci.h>
15 #include <linux/export.h>
16 #include <linux/delay.h>
17 #include <linux/ssb/ssb_embedded.h>
18 
19 static u32 ssb_pcie_read(struct ssb_pcicore *pc, u32 address);
20 static void ssb_pcie_write(struct ssb_pcicore *pc, u32 address, u32 data);
21 static u16 ssb_pcie_mdio_read(struct ssb_pcicore *pc, u8 device, u8 address);
22 static void ssb_pcie_mdio_write(struct ssb_pcicore *pc, u8 device,
23 				u8 address, u16 data);
24 
25 static inline
pcicore_read32(struct ssb_pcicore * pc,u16 offset)26 u32 pcicore_read32(struct ssb_pcicore *pc, u16 offset)
27 {
28 	return ssb_read32(pc->dev, offset);
29 }
30 
31 static inline
pcicore_write32(struct ssb_pcicore * pc,u16 offset,u32 value)32 void pcicore_write32(struct ssb_pcicore *pc, u16 offset, u32 value)
33 {
34 	ssb_write32(pc->dev, offset, value);
35 }
36 
37 static inline
pcicore_read16(struct ssb_pcicore * pc,u16 offset)38 u16 pcicore_read16(struct ssb_pcicore *pc, u16 offset)
39 {
40 	return ssb_read16(pc->dev, offset);
41 }
42 
43 static inline
pcicore_write16(struct ssb_pcicore * pc,u16 offset,u16 value)44 void pcicore_write16(struct ssb_pcicore *pc, u16 offset, u16 value)
45 {
46 	ssb_write16(pc->dev, offset, value);
47 }
48 
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.
58  * This is MIPS specific
59  */
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. */
66 static DEFINE_SPINLOCK(cfgspace_lock);
67 /* Core to access the external PCI config space. Can only have one. */
68 static struct ssb_pcicore *extpci_core;
69 
70 
get_cfgspace_addr(struct ssb_pcicore * pc,unsigned int bus,unsigned int dev,unsigned int func,unsigned int off)71 static 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 
78 	/* We do only have one cardbus device behind the bridge. */
79 	if (pc->cardbusmode && (dev > 1))
80 		goto out;
81 
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 	}
106 out:
107 	return addr;
108 }
109 
ssb_extpci_read_config(struct ssb_pcicore * pc,unsigned int bus,unsigned int dev,unsigned int func,unsigned int off,void * buf,int len)110 static 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 
119 	WARN_ON(!pc->hostmode);
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;
126 	mmio = ioremap(addr, len);
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;
150 unmap:
151 	iounmap(mmio);
152 out:
153 	return err;
154 }
155 
ssb_extpci_write_config(struct ssb_pcicore * pc,unsigned int bus,unsigned int dev,unsigned int func,unsigned int off,const void * buf,int len)156 static 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 
165 	WARN_ON(!pc->hostmode);
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;
172 	mmio = ioremap(addr, len);
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;
199 unmap:
200 	iounmap(mmio);
201 out:
202 	return err;
203 }
204 
ssb_pcicore_read_config(struct pci_bus * bus,unsigned int devfn,int reg,int size,u32 * val)205 static 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 
ssb_pcicore_write_config(struct pci_bus * bus,unsigned int devfn,int reg,int size,u32 val)219 static 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 
233 static struct pci_ops ssb_pcicore_pciops = {
234 	.read	= ssb_pcicore_read_config,
235 	.write	= ssb_pcicore_write_config,
236 };
237 
238 static 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,
242 	.flags	= IORESOURCE_MEM | IORESOURCE_PCI_FIXED,
243 };
244 
245 static struct resource ssb_pcicore_io_resource = {
246 	.name	= "SSB PCIcore external I/O",
247 	.start	= 0x100,
248 	.end	= 0x7FF,
249 	.flags	= IORESOURCE_IO | IORESOURCE_PCI_FIXED,
250 };
251 
252 static 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,
256 };
257 
258 /* This function is called when doing a pci_enable_device().
259  * We must first check if the device is a device on the PCI-core bridge.
260  */
ssb_pcicore_plat_dev_init(struct pci_dev * d)261 int ssb_pcicore_plat_dev_init(struct pci_dev *d)
262 {
263 	if (d->bus->ops != &ssb_pcicore_pciops) {
264 		/* This is not a device on the PCI-core bridge. */
265 		return -ENODEV;
266 	}
267 
268 	dev_info(&d->dev, "PCI: Fixing up device %s\n", pci_name(d));
269 
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. */
ssb_pcicore_fixup_pcibridge(struct pci_dev * dev)278 static 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 
289 	dev_info(&dev->dev, "PCI: Fixing up bridge %s\n", pci_name(dev));
290 
291 	/* Enable PCI bridge bus mastering and memory space */
292 	pci_set_master(dev);
293 	if (pcibios_enable_device(dev, ~0) < 0) {
294 		dev_err(&dev->dev, "PCI: SSB bridge enable failed\n");
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;
303 	dev_info(&dev->dev,
304 		 "PCI: Fixing latency timer of device %s to %u\n",
305 		 pci_name(dev), lat);
306 	pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
307 }
308 DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ssb_pcicore_fixup_pcibridge);
309 
310 /* PCI device IRQ mapping. */
ssb_pcicore_pcibios_map_irq(const struct pci_dev * dev,u8 slot,u8 pin)311 int 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 
ssb_pcicore_init_hostmode(struct ssb_pcicore * pc)320 static void ssb_pcicore_init_hostmode(struct ssb_pcicore *pc)
321 {
322 	u32 val;
323 
324 	if (WARN_ON(extpci_core))
325 		return;
326 	extpci_core = pc;
327 
328 	dev_dbg(pc->dev->dev, "PCIcore in host mode found\n");
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 
342 	if (pc->dev->bus->has_cardbus_slot) {
343 		dev_dbg(pc->dev->dev, "CardBus slot detected\n");
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 	}
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 
363 	/*
364 	 * Accessing PCI config without a proper delay after devices reset (not
365 	 * GPIO reset) was causing reboots on WRT300N v1.0 (BCM4704).
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.
368 	 * The same problem was reported for WRT350N v1 (BCM4705), so we just
369 	 * sleep here unconditionally.
370 	 */
371 	usleep_range(1000, 2000);
372 
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
386 	 * to non-MIPS platform.
387 	 */
388 	ssb_pcicore_controller.io_map_base = (unsigned long)ioremap(SSB_PCI_MEM, 0x04000000);
389 	set_io_port_base(ssb_pcicore_controller.io_map_base);
390 	/* Give some time to the PCI controller to configure itself with the new
391 	 * values. Not waiting at this point causes crashes of the machine.
392 	 */
393 	mdelay(10);
394 	register_pci_controller(&ssb_pcicore_controller);
395 }
396 
pcicore_is_in_hostmode(struct ssb_pcicore * pc)397 static int pcicore_is_in_hostmode(struct ssb_pcicore *pc)
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 
408 	if (bus->sprom.boardflags_lo & SSB_PCICORE_BFL_NOPCI)
409 		return 0;
410 
411 	/* The 200-pin BCM4712 package does not bond out PCI. Even when
412 	 * PCI is bonded out, some boards may leave the pins floating.
413 	 */
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 
427 /**************************************************
428  * Workarounds.
429  **************************************************/
430 
ssb_pcicore_fix_sprom_core_index(struct ssb_pcicore * pc)431 static void ssb_pcicore_fix_sprom_core_index(struct ssb_pcicore *pc)
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 
ssb_pcicore_polarity_workaround(struct ssb_pcicore * pc)441 static u8 ssb_pcicore_polarity_workaround(struct ssb_pcicore *pc)
442 {
443 	return (ssb_pcie_read(pc, 0x204) & 0x10) ? 0xC0 : 0x80;
444 }
445 
ssb_pcicore_serdes_workaround(struct ssb_pcicore * pc)446 static 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 }
458 
ssb_pcicore_pci_setup_workarounds(struct ssb_pcicore * pc)459 static 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 
ssb_pcicore_pcie_setup_workarounds(struct ssb_pcicore * pc)485 static void ssb_pcicore_pcie_setup_workarounds(struct ssb_pcicore *pc)
486 {
487 	u32 tmp;
488 	u8 rev = pc->dev->id.revision;
489 
490 	if (rev == 0 || rev == 1) {
491 		/* TLP Workaround register. */
492 		tmp = ssb_pcie_read(pc, 0x4);
493 		tmp |= 0x8;
494 		ssb_pcie_write(pc, 0x4, tmp);
495 	}
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) {
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);
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);
526 	}
527 }
528 
529 /**************************************************
530  * Generic and Clientmode operation code.
531  **************************************************/
532 
ssb_pcicore_init_clientmode(struct ssb_pcicore * pc)533 static void ssb_pcicore_init_clientmode(struct ssb_pcicore *pc)
534 {
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);
540 
541 	/* Disable PCI interrupts. */
542 	ssb_write32(pdev, SSB_INTVEC, 0);
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 	}
550 }
551 
ssb_pcicore_init(struct ssb_pcicore * pc)552 void ssb_pcicore_init(struct ssb_pcicore *pc)
553 {
554 	struct ssb_device *dev = pc->dev;
555 
556 	if (!dev)
557 		return;
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 
ssb_pcie_read(struct ssb_pcicore * pc,u32 address)570 static 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 
ssb_pcie_write(struct ssb_pcicore * pc,u32 address,u32 data)576 static 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 
ssb_pcie_mdio_set_phy(struct ssb_pcicore * pc,u8 phy)582 static 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 
ssb_pcie_mdio_read(struct ssb_pcicore * pc,u8 device,u8 address)605 static 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);
632 	for (i = 0; i < max_retries; i++) {
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 }
644 
ssb_pcie_mdio_write(struct ssb_pcicore * pc,u8 device,u8 address,u16 data)645 static 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;
650 	int max_retries = 10;
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 
658 	if (pc->dev->id.revision >= 10) {
659 		max_retries = 200;
660 		ssb_pcie_mdio_set_phy(pc, device);
661 	}
662 
663 	v = (1 << 30); /* Start of Transaction */
664 	v |= (1 << 28); /* Write Transaction */
665 	v |= (1 << 17); /* Turnaround */
666 	if (pc->dev->id.revision < 10)
667 		v |= (u32)device << 22;
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);
673 	for (i = 0; i < max_retries; i++) {
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 
ssb_pcicore_dev_irqvecs_enable(struct ssb_pcicore * pc,struct ssb_device * dev)682 int 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 
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.
693 		 * So we must not enable routing through the PCI core.
694 		 */
695 		goto out;
696 	}
697 
698 	if (!pdev)
699 		goto out;
700 	bus = pdev->bus;
701 
702 	might_sleep_if(pdev->id.coreid != SSB_DEV_PCI);
703 
704 	/* Enable interrupts for this device. */
705 	if ((pdev->id.revision >= 6) || (pdev->id.coreid == SSB_DEV_PCIE)) {
706 		u32 coremask;
707 
708 		/* Calculate the "coremask" for the device. */
709 		coremask = (1 << dev->core_index);
710 
711 		WARN_ON(bus->bustype != SSB_BUSTYPE_PCI);
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);
723 		tmp = ssb_read32(dev, SSB_TPSFLAG);
724 		tmp &= SSB_TPSFLAG_BPFLAG;
725 		intvec |= (1 << tmp);
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) {
733 		ssb_pcicore_pci_setup_workarounds(pc);
734 	} else {
735 		WARN_ON(pdev->id.coreid != SSB_DEV_PCIE);
736 		ssb_pcicore_pcie_setup_workarounds(pc);
737 	}
738 	pc->setup_done = 1;
739 out:
740 	return err;
741 }
742 EXPORT_SYMBOL(ssb_pcicore_dev_irqvecs_enable);
743