1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * leon_pci_grpci2.c: GRPCI2 Host PCI driver
4  *
5  * Copyright (C) 2011 Aeroflex Gaisler AB, Daniel Hellstrom
6  *
7  */
8 
9 #include <linux/kernel.h>
10 #include <linux/pci.h>
11 #include <linux/slab.h>
12 #include <linux/delay.h>
13 #include <linux/export.h>
14 #include <linux/of.h>
15 #include <linux/platform_device.h>
16 
17 #include <asm/io.h>
18 #include <asm/leon.h>
19 #include <asm/vaddrs.h>
20 #include <asm/sections.h>
21 #include <asm/leon_pci.h>
22 
23 #include "irq.h"
24 
25 struct grpci2_barcfg {
26 	unsigned long pciadr;	/* PCI Space Address */
27 	unsigned long ahbadr;	/* PCI Base address mapped to this AHB addr */
28 };
29 
30 /* Device Node Configuration options:
31  *  - barcfgs    : Custom Configuration of Host's 6 target BARs
32  *  - irq_mask   : Limit which PCI interrupts are enabled
33  *  - do_reset   : Force PCI Reset on startup
34  *
35  * barcfgs
36  * =======
37  *
38  * Optional custom Target BAR configuration (see struct grpci2_barcfg). All
39  * addresses are physical. Array always contains 6 elements (len=2*4*6 bytes)
40  *
41  * -1 means not configured (let host driver do default setup).
42  *
43  * [i*2+0] = PCI Address of BAR[i] on target interface
44  * [i*2+1] = Accessing PCI address of BAR[i] result in this AMBA address
45  *
46  *
47  * irq_mask
48  * ========
49  *
50  * Limit which PCI interrupts are enabled. 0=Disable, 1=Enable. By default
51  * all are enabled. Use this when PCI interrupt pins are floating on PCB.
52  * int, len=4.
53  *  bit0 = PCI INTA#
54  *  bit1 = PCI INTB#
55  *  bit2 = PCI INTC#
56  *  bit3 = PCI INTD#
57  *
58  *
59  * reset
60  * =====
61  *
62  * Force PCI reset on startup. int, len=4
63  */
64 
65 /* Enable Debugging Configuration Space Access */
66 #undef GRPCI2_DEBUG_CFGACCESS
67 
68 /*
69  * GRPCI2 APB Register MAP
70  */
71 struct grpci2_regs {
72 	unsigned int ctrl;		/* 0x00 Control */
73 	unsigned int sts_cap;		/* 0x04 Status / Capabilities */
74 	int res1;			/* 0x08 */
75 	unsigned int io_map;		/* 0x0C I/O Map address */
76 	unsigned int dma_ctrl;		/* 0x10 DMA */
77 	unsigned int dma_bdbase;	/* 0x14 DMA */
78 	int res2[2];			/* 0x18 */
79 	unsigned int bars[6];		/* 0x20 read-only PCI BARs */
80 	int res3[2];			/* 0x38 */
81 	unsigned int ahbmst_map[16];	/* 0x40 AHB->PCI Map per AHB Master */
82 
83 	/* PCI Trace Buffer Registers (OPTIONAL) */
84 	unsigned int t_ctrl;		/* 0x80 */
85 	unsigned int t_cnt;		/* 0x84 */
86 	unsigned int t_adpat;		/* 0x88 */
87 	unsigned int t_admask;		/* 0x8C */
88 	unsigned int t_sigpat;		/* 0x90 */
89 	unsigned int t_sigmask;		/* 0x94 */
90 	unsigned int t_adstate;		/* 0x98 */
91 	unsigned int t_sigstate;	/* 0x9C */
92 };
93 
94 #define REGLOAD(a)	(be32_to_cpu(__raw_readl(&(a))))
95 #define REGSTORE(a, v)	(__raw_writel(cpu_to_be32(v), &(a)))
96 
97 #define CTRL_BUS_BIT 16
98 
99 #define CTRL_RESET (1<<31)
100 #define CTRL_SI (1<<27)
101 #define CTRL_PE (1<<26)
102 #define CTRL_EI (1<<25)
103 #define CTRL_ER (1<<24)
104 #define CTRL_BUS (0xff<<CTRL_BUS_BIT)
105 #define CTRL_HOSTINT 0xf
106 
107 #define STS_HOST_BIT	31
108 #define STS_MST_BIT	30
109 #define STS_TAR_BIT	29
110 #define STS_DMA_BIT	28
111 #define STS_DI_BIT	27
112 #define STS_HI_BIT	26
113 #define STS_IRQMODE_BIT	24
114 #define STS_TRACE_BIT	23
115 #define STS_CFGERRVALID_BIT 20
116 #define STS_CFGERR_BIT	19
117 #define STS_INTTYPE_BIT	12
118 #define STS_INTSTS_BIT	8
119 #define STS_FDEPTH_BIT	2
120 #define STS_FNUM_BIT	0
121 
122 #define STS_HOST	(1<<STS_HOST_BIT)
123 #define STS_MST		(1<<STS_MST_BIT)
124 #define STS_TAR		(1<<STS_TAR_BIT)
125 #define STS_DMA		(1<<STS_DMA_BIT)
126 #define STS_DI		(1<<STS_DI_BIT)
127 #define STS_HI		(1<<STS_HI_BIT)
128 #define STS_IRQMODE	(0x3<<STS_IRQMODE_BIT)
129 #define STS_TRACE	(1<<STS_TRACE_BIT)
130 #define STS_CFGERRVALID	(1<<STS_CFGERRVALID_BIT)
131 #define STS_CFGERR	(1<<STS_CFGERR_BIT)
132 #define STS_INTTYPE	(0x3f<<STS_INTTYPE_BIT)
133 #define STS_INTSTS	(0xf<<STS_INTSTS_BIT)
134 #define STS_FDEPTH	(0x7<<STS_FDEPTH_BIT)
135 #define STS_FNUM	(0x3<<STS_FNUM_BIT)
136 
137 #define STS_ISYSERR	(1<<17)
138 #define STS_IDMA	(1<<16)
139 #define STS_IDMAERR	(1<<15)
140 #define STS_IMSTABRT	(1<<14)
141 #define STS_ITGTABRT	(1<<13)
142 #define STS_IPARERR	(1<<12)
143 
144 #define STS_ERR_IRQ (STS_ISYSERR | STS_IMSTABRT | STS_ITGTABRT | STS_IPARERR)
145 
146 struct grpci2_bd_chan {
147 	unsigned int ctrl;	/* 0x00 DMA Control */
148 	unsigned int nchan;	/* 0x04 Next DMA Channel Address */
149 	unsigned int nbd;	/* 0x08 Next Data Descriptor in chan */
150 	unsigned int res;	/* 0x0C Reserved */
151 };
152 
153 #define BD_CHAN_EN		0x80000000
154 #define BD_CHAN_TYPE		0x00300000
155 #define BD_CHAN_BDCNT		0x0000ffff
156 #define BD_CHAN_EN_BIT		31
157 #define BD_CHAN_TYPE_BIT	20
158 #define BD_CHAN_BDCNT_BIT	0
159 
160 struct grpci2_bd_data {
161 	unsigned int ctrl;	/* 0x00 DMA Data Control */
162 	unsigned int pci_adr;	/* 0x04 PCI Start Address */
163 	unsigned int ahb_adr;	/* 0x08 AHB Start address */
164 	unsigned int next;	/* 0x0C Next Data Descriptor in chan */
165 };
166 
167 #define BD_DATA_EN		0x80000000
168 #define BD_DATA_IE		0x40000000
169 #define BD_DATA_DR		0x20000000
170 #define BD_DATA_TYPE		0x00300000
171 #define BD_DATA_ER		0x00080000
172 #define BD_DATA_LEN		0x0000ffff
173 #define BD_DATA_EN_BIT		31
174 #define BD_DATA_IE_BIT		30
175 #define BD_DATA_DR_BIT		29
176 #define BD_DATA_TYPE_BIT	20
177 #define BD_DATA_ER_BIT		19
178 #define BD_DATA_LEN_BIT		0
179 
180 /* GRPCI2 Capability */
181 struct grpci2_cap_first {
182 	unsigned int ctrl;
183 	unsigned int pci2ahb_map[6];
184 	unsigned int ext2ahb_map;
185 	unsigned int io_map;
186 	unsigned int pcibar_size[6];
187 };
188 #define CAP9_CTRL_OFS 0
189 #define CAP9_BAR_OFS 0x4
190 #define CAP9_IOMAP_OFS 0x20
191 #define CAP9_BARSIZE_OFS 0x24
192 
193 #define TGT 256
194 
195 struct grpci2_priv {
196 	struct leon_pci_info	info; /* must be on top of this structure */
197 	struct grpci2_regs __iomem *regs;
198 	char			irq;
199 	char			irq_mode; /* IRQ Mode from CAPSTS REG */
200 	char			bt_enabled;
201 	char			do_reset;
202 	char			irq_mask;
203 	u32			pciid; /* PCI ID of Host */
204 	unsigned char		irq_map[4];
205 
206 	/* Virtual IRQ numbers */
207 	unsigned int		virq_err;
208 	unsigned int		virq_dma;
209 
210 	/* AHB PCI Windows */
211 	unsigned long		pci_area;	/* MEMORY */
212 	unsigned long		pci_area_end;
213 	unsigned long		pci_io;		/* I/O */
214 	unsigned long		pci_conf;	/* CONFIGURATION */
215 	unsigned long		pci_conf_end;
216 	unsigned long		pci_io_va;
217 
218 	struct grpci2_barcfg	tgtbars[6];
219 };
220 
221 static DEFINE_SPINLOCK(grpci2_dev_lock);
222 static struct grpci2_priv *grpci2priv;
223 
224 static int grpci2_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
225 {
226 	struct grpci2_priv *priv = dev->bus->sysdata;
227 	int irq_group;
228 
229 	/* Use default IRQ decoding on PCI BUS0 according slot numbering */
230 	irq_group = slot & 0x3;
231 	pin = ((pin - 1) + irq_group) & 0x3;
232 
233 	return priv->irq_map[pin];
234 }
235 
236 static int grpci2_cfg_r32(struct grpci2_priv *priv, unsigned int bus,
237 				unsigned int devfn, int where, u32 *val)
238 {
239 	unsigned int *pci_conf;
240 	unsigned long flags;
241 	u32 tmp;
242 
243 	if (where & 0x3)
244 		return -EINVAL;
245 
246 	if (bus == 0) {
247 		devfn += (0x8 * 6); /* start at AD16=Device0 */
248 	} else if (bus == TGT) {
249 		bus = 0;
250 		devfn = 0; /* special case: bridge controller itself */
251 	}
252 
253 	/* Select bus */
254 	spin_lock_irqsave(&grpci2_dev_lock, flags);
255 	REGSTORE(priv->regs->ctrl, (REGLOAD(priv->regs->ctrl) & ~(0xff << 16)) |
256 				   (bus << 16));
257 	spin_unlock_irqrestore(&grpci2_dev_lock, flags);
258 
259 	/* clear old status */
260 	REGSTORE(priv->regs->sts_cap, (STS_CFGERR | STS_CFGERRVALID));
261 
262 	pci_conf = (unsigned int *) (priv->pci_conf |
263 						(devfn << 8) | (where & 0xfc));
264 	tmp = LEON3_BYPASS_LOAD_PA(pci_conf);
265 
266 	/* Wait until GRPCI2 signals that CFG access is done, it should be
267 	 * done instantaneously unless a DMA operation is ongoing...
268 	 */
269 	while ((REGLOAD(priv->regs->sts_cap) & STS_CFGERRVALID) == 0)
270 		;
271 
272 	if (REGLOAD(priv->regs->sts_cap) & STS_CFGERR) {
273 		*val = 0xffffffff;
274 	} else {
275 		/* Bus always little endian (unaffected by byte-swapping) */
276 		*val = swab32(tmp);
277 	}
278 
279 	return 0;
280 }
281 
282 static int grpci2_cfg_r16(struct grpci2_priv *priv, unsigned int bus,
283 				unsigned int devfn, int where, u32 *val)
284 {
285 	u32 v;
286 	int ret;
287 
288 	if (where & 0x1)
289 		return -EINVAL;
290 	ret = grpci2_cfg_r32(priv, bus, devfn, where & ~0x3, &v);
291 	*val = 0xffff & (v >> (8 * (where & 0x3)));
292 	return ret;
293 }
294 
295 static int grpci2_cfg_r8(struct grpci2_priv *priv, unsigned int bus,
296 				unsigned int devfn, int where, u32 *val)
297 {
298 	u32 v;
299 	int ret;
300 
301 	ret = grpci2_cfg_r32(priv, bus, devfn, where & ~0x3, &v);
302 	*val = 0xff & (v >> (8 * (where & 3)));
303 
304 	return ret;
305 }
306 
307 static int grpci2_cfg_w32(struct grpci2_priv *priv, unsigned int bus,
308 				unsigned int devfn, int where, u32 val)
309 {
310 	unsigned int *pci_conf;
311 	unsigned long flags;
312 
313 	if (where & 0x3)
314 		return -EINVAL;
315 
316 	if (bus == 0) {
317 		devfn += (0x8 * 6); /* start at AD16=Device0 */
318 	} else if (bus == TGT) {
319 		bus = 0;
320 		devfn = 0; /* special case: bridge controller itself */
321 	}
322 
323 	/* Select bus */
324 	spin_lock_irqsave(&grpci2_dev_lock, flags);
325 	REGSTORE(priv->regs->ctrl, (REGLOAD(priv->regs->ctrl) & ~(0xff << 16)) |
326 				   (bus << 16));
327 	spin_unlock_irqrestore(&grpci2_dev_lock, flags);
328 
329 	/* clear old status */
330 	REGSTORE(priv->regs->sts_cap, (STS_CFGERR | STS_CFGERRVALID));
331 
332 	pci_conf = (unsigned int *) (priv->pci_conf |
333 						(devfn << 8) | (where & 0xfc));
334 	LEON3_BYPASS_STORE_PA(pci_conf, swab32(val));
335 
336 	/* Wait until GRPCI2 signals that CFG access is done, it should be
337 	 * done instantaneously unless a DMA operation is ongoing...
338 	 */
339 	while ((REGLOAD(priv->regs->sts_cap) & STS_CFGERRVALID) == 0)
340 		;
341 
342 	return 0;
343 }
344 
345 static int grpci2_cfg_w16(struct grpci2_priv *priv, unsigned int bus,
346 				unsigned int devfn, int where, u32 val)
347 {
348 	int ret;
349 	u32 v;
350 
351 	if (where & 0x1)
352 		return -EINVAL;
353 	ret = grpci2_cfg_r32(priv, bus, devfn, where&~3, &v);
354 	if (ret)
355 		return ret;
356 	v = (v & ~(0xffff << (8 * (where & 0x3)))) |
357 	    ((0xffff & val) << (8 * (where & 0x3)));
358 	return grpci2_cfg_w32(priv, bus, devfn, where & ~0x3, v);
359 }
360 
361 static int grpci2_cfg_w8(struct grpci2_priv *priv, unsigned int bus,
362 				unsigned int devfn, int where, u32 val)
363 {
364 	int ret;
365 	u32 v;
366 
367 	ret = grpci2_cfg_r32(priv, bus, devfn, where & ~0x3, &v);
368 	if (ret != 0)
369 		return ret;
370 	v = (v & ~(0xff << (8 * (where & 0x3)))) |
371 	    ((0xff & val) << (8 * (where & 0x3)));
372 	return grpci2_cfg_w32(priv, bus, devfn, where & ~0x3, v);
373 }
374 
375 /* Read from Configuration Space. When entering here the PCI layer has taken
376  * the pci_lock spinlock and IRQ is off.
377  */
378 static int grpci2_read_config(struct pci_bus *bus, unsigned int devfn,
379 			      int where, int size, u32 *val)
380 {
381 	struct grpci2_priv *priv = grpci2priv;
382 	unsigned int busno = bus->number;
383 	int ret;
384 
385 	if (PCI_SLOT(devfn) > 15 || busno > 255) {
386 		*val = ~0;
387 		return 0;
388 	}
389 
390 	switch (size) {
391 	case 1:
392 		ret = grpci2_cfg_r8(priv, busno, devfn, where, val);
393 		break;
394 	case 2:
395 		ret = grpci2_cfg_r16(priv, busno, devfn, where, val);
396 		break;
397 	case 4:
398 		ret = grpci2_cfg_r32(priv, busno, devfn, where, val);
399 		break;
400 	default:
401 		ret = -EINVAL;
402 		break;
403 	}
404 
405 #ifdef GRPCI2_DEBUG_CFGACCESS
406 	printk(KERN_INFO "grpci2_read_config: [%02x:%02x:%x] ofs=%d val=%x "
407 		"size=%d\n", busno, PCI_SLOT(devfn), PCI_FUNC(devfn), where,
408 		*val, size);
409 #endif
410 
411 	return ret;
412 }
413 
414 /* Write to Configuration Space. When entering here the PCI layer has taken
415  * the pci_lock spinlock and IRQ is off.
416  */
417 static int grpci2_write_config(struct pci_bus *bus, unsigned int devfn,
418 			       int where, int size, u32 val)
419 {
420 	struct grpci2_priv *priv = grpci2priv;
421 	unsigned int busno = bus->number;
422 
423 	if (PCI_SLOT(devfn) > 15 || busno > 255)
424 		return 0;
425 
426 #ifdef GRPCI2_DEBUG_CFGACCESS
427 	printk(KERN_INFO "grpci2_write_config: [%02x:%02x:%x] ofs=%d size=%d "
428 		"val=%x\n", busno, PCI_SLOT(devfn), PCI_FUNC(devfn),
429 		where, size, val);
430 #endif
431 
432 	switch (size) {
433 	default:
434 		return -EINVAL;
435 	case 1:
436 		return grpci2_cfg_w8(priv, busno, devfn, where, val);
437 	case 2:
438 		return grpci2_cfg_w16(priv, busno, devfn, where, val);
439 	case 4:
440 		return grpci2_cfg_w32(priv, busno, devfn, where, val);
441 	}
442 }
443 
444 static struct pci_ops grpci2_ops = {
445 	.read =		grpci2_read_config,
446 	.write =	grpci2_write_config,
447 };
448 
449 /* GENIRQ IRQ chip implementation for GRPCI2 irqmode=0..2. In configuration
450  * 3 where all PCI Interrupts has a separate IRQ on the system IRQ controller
451  * this is not needed and the standard IRQ controller can be used.
452  */
453 
454 static void grpci2_mask_irq(struct irq_data *data)
455 {
456 	unsigned long flags;
457 	unsigned int irqidx;
458 	struct grpci2_priv *priv = grpci2priv;
459 
460 	irqidx = (unsigned int)data->chip_data - 1;
461 	if (irqidx > 3) /* only mask PCI interrupts here */
462 		return;
463 
464 	spin_lock_irqsave(&grpci2_dev_lock, flags);
465 	REGSTORE(priv->regs->ctrl, REGLOAD(priv->regs->ctrl) & ~(1 << irqidx));
466 	spin_unlock_irqrestore(&grpci2_dev_lock, flags);
467 }
468 
469 static void grpci2_unmask_irq(struct irq_data *data)
470 {
471 	unsigned long flags;
472 	unsigned int irqidx;
473 	struct grpci2_priv *priv = grpci2priv;
474 
475 	irqidx = (unsigned int)data->chip_data - 1;
476 	if (irqidx > 3) /* only unmask PCI interrupts here */
477 		return;
478 
479 	spin_lock_irqsave(&grpci2_dev_lock, flags);
480 	REGSTORE(priv->regs->ctrl, REGLOAD(priv->regs->ctrl) | (1 << irqidx));
481 	spin_unlock_irqrestore(&grpci2_dev_lock, flags);
482 }
483 
484 static unsigned int grpci2_startup_irq(struct irq_data *data)
485 {
486 	grpci2_unmask_irq(data);
487 	return 0;
488 }
489 
490 static void grpci2_shutdown_irq(struct irq_data *data)
491 {
492 	grpci2_mask_irq(data);
493 }
494 
495 static struct irq_chip grpci2_irq = {
496 	.name		= "grpci2",
497 	.irq_startup	= grpci2_startup_irq,
498 	.irq_shutdown	= grpci2_shutdown_irq,
499 	.irq_mask	= grpci2_mask_irq,
500 	.irq_unmask	= grpci2_unmask_irq,
501 };
502 
503 /* Handle one or multiple IRQs from the PCI core */
504 static void grpci2_pci_flow_irq(struct irq_desc *desc)
505 {
506 	struct grpci2_priv *priv = grpci2priv;
507 	int i, ack = 0;
508 	unsigned int ctrl, sts_cap, pci_ints;
509 
510 	ctrl = REGLOAD(priv->regs->ctrl);
511 	sts_cap = REGLOAD(priv->regs->sts_cap);
512 
513 	/* Error Interrupt? */
514 	if (sts_cap & STS_ERR_IRQ) {
515 		generic_handle_irq(priv->virq_err);
516 		ack = 1;
517 	}
518 
519 	/* PCI Interrupt? */
520 	pci_ints = ((~sts_cap) >> STS_INTSTS_BIT) & ctrl & CTRL_HOSTINT;
521 	if (pci_ints) {
522 		/* Call respective PCI Interrupt handler */
523 		for (i = 0; i < 4; i++) {
524 			if (pci_ints & (1 << i))
525 				generic_handle_irq(priv->irq_map[i]);
526 		}
527 		ack = 1;
528 	}
529 
530 	/*
531 	 * Decode DMA Interrupt only when shared with Err and PCI INTX#, when
532 	 * the DMA is a unique IRQ the DMA interrupts doesn't end up here, they
533 	 * goes directly to DMA ISR.
534 	 */
535 	if ((priv->irq_mode == 0) && (sts_cap & (STS_IDMA | STS_IDMAERR))) {
536 		generic_handle_irq(priv->virq_dma);
537 		ack = 1;
538 	}
539 
540 	/*
541 	 * Call "first level" IRQ chip end-of-irq handler. It will ACK LEON IRQ
542 	 * Controller, this must be done after IRQ sources have been handled to
543 	 * avoid double IRQ generation
544 	 */
545 	if (ack)
546 		desc->irq_data.chip->irq_eoi(&desc->irq_data);
547 }
548 
549 /* Create a virtual IRQ */
550 static unsigned int grpci2_build_device_irq(unsigned int irq)
551 {
552 	unsigned int virq = 0, pil;
553 
554 	pil = 1 << 8;
555 	virq = irq_alloc(irq, pil);
556 	if (virq == 0)
557 		goto out;
558 
559 	irq_set_chip_and_handler_name(virq, &grpci2_irq, handle_simple_irq,
560 				      "pcilvl");
561 	irq_set_chip_data(virq, (void *)irq);
562 
563 out:
564 	return virq;
565 }
566 
567 static void grpci2_hw_init(struct grpci2_priv *priv)
568 {
569 	u32 ahbadr, pciadr, bar_sz, capptr, io_map, data;
570 	struct grpci2_regs __iomem *regs = priv->regs;
571 	int i;
572 	struct grpci2_barcfg *barcfg = priv->tgtbars;
573 
574 	/* Reset any earlier setup */
575 	if (priv->do_reset) {
576 		printk(KERN_INFO "GRPCI2: Resetting PCI bus\n");
577 		REGSTORE(regs->ctrl, CTRL_RESET);
578 		ssleep(1); /* Wait for boards to settle */
579 	}
580 	REGSTORE(regs->ctrl, 0);
581 	REGSTORE(regs->sts_cap, ~0); /* Clear Status */
582 	REGSTORE(regs->dma_ctrl, 0);
583 	REGSTORE(regs->dma_bdbase, 0);
584 
585 	/* Translate I/O accesses to 0, I/O Space always @ PCI low 64Kbytes */
586 	REGSTORE(regs->io_map, REGLOAD(regs->io_map) & 0x0000ffff);
587 
588 	/* set 1:1 mapping between AHB -> PCI memory space, for all Masters
589 	 * Each AHB master has it's own mapping registers. Max 16 AHB masters.
590 	 */
591 	for (i = 0; i < 16; i++)
592 		REGSTORE(regs->ahbmst_map[i], priv->pci_area);
593 
594 	/* Get the GRPCI2 Host PCI ID */
595 	grpci2_cfg_r32(priv, TGT, 0, PCI_VENDOR_ID, &priv->pciid);
596 
597 	/* Get address to first (always defined) capability structure */
598 	grpci2_cfg_r8(priv, TGT, 0, PCI_CAPABILITY_LIST, &capptr);
599 
600 	/* Enable/Disable Byte twisting */
601 	grpci2_cfg_r32(priv, TGT, 0, capptr+CAP9_IOMAP_OFS, &io_map);
602 	io_map = (io_map & ~0x1) | (priv->bt_enabled ? 1 : 0);
603 	grpci2_cfg_w32(priv, TGT, 0, capptr+CAP9_IOMAP_OFS, io_map);
604 
605 	/* Setup the Host's PCI Target BARs for other peripherals to access,
606 	 * and do DMA to the host's memory. The target BARs can be sized and
607 	 * enabled individually.
608 	 *
609 	 * User may set custom target BARs, but default is:
610 	 * The first BARs is used to map kernel low (DMA is part of normal
611 	 * region on sparc which is SRMMU_MAXMEM big) main memory 1:1 to the
612 	 * PCI bus, the other BARs are disabled. We assume that the first BAR
613 	 * is always available.
614 	 */
615 	for (i = 0; i < 6; i++) {
616 		if (barcfg[i].pciadr != ~0 && barcfg[i].ahbadr != ~0) {
617 			/* Target BARs must have the proper alignment */
618 			ahbadr = barcfg[i].ahbadr;
619 			pciadr = barcfg[i].pciadr;
620 			bar_sz = ((pciadr - 1) & ~pciadr) + 1;
621 		} else {
622 			if (i == 0) {
623 				/* Map main memory */
624 				bar_sz = 0xf0000008; /* 256MB prefetchable */
625 				ahbadr = 0xf0000000 & (u32)__pa(PAGE_ALIGN(
626 					(unsigned long) &_end));
627 				pciadr = ahbadr;
628 			} else {
629 				bar_sz = 0;
630 				ahbadr = 0;
631 				pciadr = 0;
632 			}
633 		}
634 		grpci2_cfg_w32(priv, TGT, 0, capptr+CAP9_BARSIZE_OFS+i*4,
635 				bar_sz);
636 		grpci2_cfg_w32(priv, TGT, 0, PCI_BASE_ADDRESS_0+i*4, pciadr);
637 		grpci2_cfg_w32(priv, TGT, 0, capptr+CAP9_BAR_OFS+i*4, ahbadr);
638 		printk(KERN_INFO "        TGT BAR[%d]: 0x%08x (PCI)-> 0x%08x\n",
639 			i, pciadr, ahbadr);
640 	}
641 
642 	/* set as bus master and enable pci memory responses */
643 	grpci2_cfg_r32(priv, TGT, 0, PCI_COMMAND, &data);
644 	data |= (PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
645 	grpci2_cfg_w32(priv, TGT, 0, PCI_COMMAND, data);
646 
647 	/* Enable Error respone (CPU-TRAP) on illegal memory access. */
648 	REGSTORE(regs->ctrl, CTRL_ER | CTRL_PE);
649 }
650 
651 static irqreturn_t grpci2_jump_interrupt(int irq, void *arg)
652 {
653 	printk(KERN_ERR "GRPCI2: Jump IRQ happened\n");
654 	return IRQ_NONE;
655 }
656 
657 /* Handle GRPCI2 Error Interrupt */
658 static irqreturn_t grpci2_err_interrupt(int irq, void *arg)
659 {
660 	struct grpci2_priv *priv = arg;
661 	struct grpci2_regs __iomem *regs = priv->regs;
662 	unsigned int status;
663 
664 	status = REGLOAD(regs->sts_cap);
665 	if ((status & STS_ERR_IRQ) == 0)
666 		return IRQ_NONE;
667 
668 	if (status & STS_IPARERR)
669 		printk(KERN_ERR "GRPCI2: Parity Error\n");
670 
671 	if (status & STS_ITGTABRT)
672 		printk(KERN_ERR "GRPCI2: Target Abort\n");
673 
674 	if (status & STS_IMSTABRT)
675 		printk(KERN_ERR "GRPCI2: Master Abort\n");
676 
677 	if (status & STS_ISYSERR)
678 		printk(KERN_ERR "GRPCI2: System Error\n");
679 
680 	/* Clear handled INT TYPE IRQs */
681 	REGSTORE(regs->sts_cap, status & STS_ERR_IRQ);
682 
683 	return IRQ_HANDLED;
684 }
685 
686 static int grpci2_of_probe(struct platform_device *ofdev)
687 {
688 	struct grpci2_regs __iomem *regs;
689 	struct grpci2_priv *priv;
690 	int err, i, len;
691 	const int *tmp;
692 	unsigned int capability;
693 
694 	if (grpci2priv) {
695 		printk(KERN_ERR "GRPCI2: only one GRPCI2 core supported\n");
696 		return -ENODEV;
697 	}
698 
699 	if (ofdev->num_resources < 3) {
700 		printk(KERN_ERR "GRPCI2: not enough APB/AHB resources\n");
701 		return -EIO;
702 	}
703 
704 	/* Find Device Address */
705 	regs = of_ioremap(&ofdev->resource[0], 0,
706 			  resource_size(&ofdev->resource[0]),
707 			  "grlib-grpci2 regs");
708 	if (regs == NULL) {
709 		printk(KERN_ERR "GRPCI2: ioremap failed\n");
710 		return -EIO;
711 	}
712 
713 	/*
714 	 * Check that we're in Host Slot and that we can act as a Host Bridge
715 	 * and not only as target.
716 	 */
717 	capability = REGLOAD(regs->sts_cap);
718 	if ((capability & STS_HOST) || !(capability & STS_MST)) {
719 		printk(KERN_INFO "GRPCI2: not in host system slot\n");
720 		err = -EIO;
721 		goto err1;
722 	}
723 
724 	priv = grpci2priv = kzalloc(sizeof(struct grpci2_priv), GFP_KERNEL);
725 	if (grpci2priv == NULL) {
726 		err = -ENOMEM;
727 		goto err1;
728 	}
729 	priv->regs = regs;
730 	priv->irq = ofdev->archdata.irqs[0]; /* BASE IRQ */
731 	priv->irq_mode = (capability & STS_IRQMODE) >> STS_IRQMODE_BIT;
732 
733 	printk(KERN_INFO "GRPCI2: host found at %p, irq%d\n", regs, priv->irq);
734 
735 	/* Byte twisting should be made configurable from kernel command line */
736 	priv->bt_enabled = 1;
737 
738 	/* Let user do custom Target BAR assignment */
739 	tmp = of_get_property(ofdev->dev.of_node, "barcfg", &len);
740 	if (tmp && (len == 2*4*6))
741 		memcpy(priv->tgtbars, tmp, 2*4*6);
742 	else
743 		memset(priv->tgtbars, -1, 2*4*6);
744 
745 	/* Limit IRQ unmasking in irq_mode 2 and 3 */
746 	tmp = of_get_property(ofdev->dev.of_node, "irq_mask", &len);
747 	if (tmp && (len == 4))
748 		priv->do_reset = *tmp;
749 	else
750 		priv->irq_mask = 0xf;
751 
752 	/* Optional PCI reset. Force PCI reset on startup */
753 	tmp = of_get_property(ofdev->dev.of_node, "reset", &len);
754 	if (tmp && (len == 4))
755 		priv->do_reset = *tmp;
756 	else
757 		priv->do_reset = 0;
758 
759 	/* Find PCI Memory, I/O and Configuration Space Windows */
760 	priv->pci_area = ofdev->resource[1].start;
761 	priv->pci_area_end = ofdev->resource[1].end+1;
762 	priv->pci_io = ofdev->resource[2].start;
763 	priv->pci_conf = ofdev->resource[2].start + 0x10000;
764 	priv->pci_conf_end = priv->pci_conf + 0x10000;
765 	priv->pci_io_va = (unsigned long)ioremap(priv->pci_io, 0x10000);
766 	if (!priv->pci_io_va) {
767 		err = -EIO;
768 		goto err2;
769 	}
770 
771 	printk(KERN_INFO
772 		"GRPCI2: MEMORY SPACE [0x%08lx - 0x%08lx]\n"
773 		"        I/O    SPACE [0x%08lx - 0x%08lx]\n"
774 		"        CONFIG SPACE [0x%08lx - 0x%08lx]\n",
775 		priv->pci_area, priv->pci_area_end-1,
776 		priv->pci_io, priv->pci_conf-1,
777 		priv->pci_conf, priv->pci_conf_end-1);
778 
779 	/*
780 	 * I/O Space resources in I/O Window mapped into Virtual Adr Space
781 	 * We never use low 4KB because some devices seem have problems using
782 	 * address 0.
783 	 */
784 	memset(&priv->info.io_space, 0, sizeof(struct resource));
785 	priv->info.io_space.name = "GRPCI2 PCI I/O Space";
786 	priv->info.io_space.start = priv->pci_io_va + 0x1000;
787 	priv->info.io_space.end = priv->pci_io_va + 0x10000 - 1;
788 	priv->info.io_space.flags = IORESOURCE_IO;
789 
790 	/*
791 	 * GRPCI2 has no prefetchable memory, map everything as
792 	 * non-prefetchable memory
793 	 */
794 	memset(&priv->info.mem_space, 0, sizeof(struct resource));
795 	priv->info.mem_space.name = "GRPCI2 PCI MEM Space";
796 	priv->info.mem_space.start = priv->pci_area;
797 	priv->info.mem_space.end = priv->pci_area_end - 1;
798 	priv->info.mem_space.flags = IORESOURCE_MEM;
799 
800 	if (request_resource(&iomem_resource, &priv->info.mem_space) < 0)
801 		goto err3;
802 	if (request_resource(&ioport_resource, &priv->info.io_space) < 0)
803 		goto err4;
804 
805 	/* setup maximum supported PCI buses */
806 	priv->info.busn.name = "GRPCI2 busn";
807 	priv->info.busn.start = 0;
808 	priv->info.busn.end = 255;
809 
810 	grpci2_hw_init(priv);
811 
812 	/*
813 	 * Get PCI Interrupt to System IRQ mapping and setup IRQ handling
814 	 * Error IRQ always on PCI INTA.
815 	 */
816 	if (priv->irq_mode < 2) {
817 		/* All PCI interrupts are shared using the same system IRQ */
818 		leon_update_virq_handling(priv->irq, grpci2_pci_flow_irq,
819 					 "pcilvl", 0);
820 
821 		priv->irq_map[0] = grpci2_build_device_irq(1);
822 		priv->irq_map[1] = grpci2_build_device_irq(2);
823 		priv->irq_map[2] = grpci2_build_device_irq(3);
824 		priv->irq_map[3] = grpci2_build_device_irq(4);
825 
826 		priv->virq_err = grpci2_build_device_irq(5);
827 		if (priv->irq_mode & 1)
828 			priv->virq_dma = ofdev->archdata.irqs[1];
829 		else
830 			priv->virq_dma = grpci2_build_device_irq(6);
831 
832 		/* Enable IRQs on LEON IRQ controller */
833 		err = request_irq(priv->irq, grpci2_jump_interrupt, 0,
834 					"GRPCI2_JUMP", priv);
835 		if (err)
836 			printk(KERN_ERR "GRPCI2: ERR IRQ request failed\n");
837 	} else {
838 		/* All PCI interrupts have an unique IRQ interrupt */
839 		for (i = 0; i < 4; i++) {
840 			/* Make LEON IRQ layer handle level IRQ by acking */
841 			leon_update_virq_handling(ofdev->archdata.irqs[i],
842 						 handle_fasteoi_irq, "pcilvl",
843 						 1);
844 			priv->irq_map[i] = ofdev->archdata.irqs[i];
845 		}
846 		priv->virq_err = priv->irq_map[0];
847 		if (priv->irq_mode & 1)
848 			priv->virq_dma = ofdev->archdata.irqs[4];
849 		else
850 			priv->virq_dma = priv->irq_map[0];
851 
852 		/* Unmask all PCI interrupts, request_irq will not do that */
853 		REGSTORE(regs->ctrl, REGLOAD(regs->ctrl)|(priv->irq_mask&0xf));
854 	}
855 
856 	/* Setup IRQ handler for non-configuration space access errors */
857 	err = request_irq(priv->virq_err, grpci2_err_interrupt, IRQF_SHARED,
858 				"GRPCI2_ERR", priv);
859 	if (err) {
860 		printk(KERN_DEBUG "GRPCI2: ERR VIRQ request failed: %d\n", err);
861 		goto err5;
862 	}
863 
864 	/*
865 	 * Enable Error Interrupts. PCI interrupts are unmasked once request_irq
866 	 * is called by the PCI Device drivers
867 	 */
868 	REGSTORE(regs->ctrl, REGLOAD(regs->ctrl) | CTRL_EI | CTRL_SI);
869 
870 	/* Init common layer and scan buses */
871 	priv->info.ops = &grpci2_ops;
872 	priv->info.map_irq = grpci2_map_irq;
873 	leon_pci_init(ofdev, &priv->info);
874 
875 	return 0;
876 
877 err5:
878 	release_resource(&priv->info.io_space);
879 err4:
880 	release_resource(&priv->info.mem_space);
881 err3:
882 	err = -ENOMEM;
883 	iounmap((void __iomem *)priv->pci_io_va);
884 err2:
885 	kfree(priv);
886 err1:
887 	of_iounmap(&ofdev->resource[0], regs,
888 		resource_size(&ofdev->resource[0]));
889 	return err;
890 }
891 
892 static const struct of_device_id grpci2_of_match[] = {
893 	{
894 	 .name = "GAISLER_GRPCI2",
895 	 },
896 	{
897 	 .name = "01_07c",
898 	 },
899 	{},
900 };
901 
902 static struct platform_driver grpci2_of_driver = {
903 	.driver = {
904 		.name = "grpci2",
905 		.of_match_table = grpci2_of_match,
906 	},
907 	.probe = grpci2_of_probe,
908 };
909 
910 static int __init grpci2_init(void)
911 {
912 	return platform_driver_register(&grpci2_of_driver);
913 }
914 
915 subsys_initcall(grpci2_init);
916