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
grpci2_map_irq(const struct pci_dev * dev,u8 slot,u8 pin)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
grpci2_cfg_r32(struct grpci2_priv * priv,unsigned int bus,unsigned int devfn,int where,u32 * val)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
grpci2_cfg_r16(struct grpci2_priv * priv,unsigned int bus,unsigned int devfn,int where,u32 * val)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
grpci2_cfg_r8(struct grpci2_priv * priv,unsigned int bus,unsigned int devfn,int where,u32 * val)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
grpci2_cfg_w32(struct grpci2_priv * priv,unsigned int bus,unsigned int devfn,int where,u32 val)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
grpci2_cfg_w16(struct grpci2_priv * priv,unsigned int bus,unsigned int devfn,int where,u32 val)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
grpci2_cfg_w8(struct grpci2_priv * priv,unsigned int bus,unsigned int devfn,int where,u32 val)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 */
grpci2_read_config(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 * val)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 */
grpci2_write_config(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 val)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
grpci2_mask_irq(struct irq_data * data)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
grpci2_unmask_irq(struct irq_data * data)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
grpci2_startup_irq(struct irq_data * data)484 static unsigned int grpci2_startup_irq(struct irq_data *data)
485 {
486 grpci2_unmask_irq(data);
487 return 0;
488 }
489
grpci2_shutdown_irq(struct irq_data * data)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 */
grpci2_pci_flow_irq(struct irq_desc * desc)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 */
grpci2_build_device_irq(unsigned int 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
grpci2_hw_init(struct grpci2_priv * priv)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 its 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
grpci2_jump_interrupt(int irq,void * arg)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 */
grpci2_err_interrupt(int irq,void * arg)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
grpci2_of_probe(struct platform_device * ofdev)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
grpci2_init(void)910 static int __init grpci2_init(void)
911 {
912 return platform_driver_register(&grpci2_of_driver);
913 }
914
915 subsys_initcall(grpci2_init);
916