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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / arch / sparc / kernel / pci_fire.c
blob0ca08d455e805d7cc72bfc74377105e78d699a68
1 // SPDX-License-Identifier: GPL-2.0
2 /* pci_fire.c: Sun4u platform PCI-E controller support.
3 *
4 * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
5 */
6 #include <linux/kernel.h>
7 #include <linux/pci.h>
8 #include <linux/slab.h>
9 #include <linux/init.h>
10 #include <linux/msi.h>
11 #include <linux/export.h>
12 #include <linux/irq.h>
13 #include <linux/of_device.h>
14 #include <linux/numa.h>
15
16 #include <asm/prom.h>
17 #include <asm/irq.h>
18 #include <asm/upa.h>
19
20 #include "pci_impl.h"
21
22 #define DRIVER_NAME "fire"
23 #define PFX DRIVER_NAME ": "
24
25 #define FIRE_IOMMU_CONTROL 0x40000UL
26 #define FIRE_IOMMU_TSBBASE 0x40008UL
27 #define FIRE_IOMMU_FLUSH 0x40100UL
28 #define FIRE_IOMMU_FLUSHINV 0x40108UL
29
30 static int pci_fire_pbm_iommu_init(struct pci_pbm_info *pbm)
31 {
32 struct iommu *iommu = pbm->iommu;
33 u32 vdma[2], dma_mask;
34 u64 control;
35 int tsbsize, err;
36
37 /* No virtual-dma property on these guys, use largest size. */
38 vdma[0] = 0xc0000000; /* base */
39 vdma[1] = 0x40000000; /* size */
40 dma_mask = 0xffffffff;
41 tsbsize = 128;
42
43 /* Register addresses. */
44 iommu->iommu_control = pbm->pbm_regs + FIRE_IOMMU_CONTROL;
45 iommu->iommu_tsbbase = pbm->pbm_regs + FIRE_IOMMU_TSBBASE;
46 iommu->iommu_flush = pbm->pbm_regs + FIRE_IOMMU_FLUSH;
47 iommu->iommu_flushinv = pbm->pbm_regs + FIRE_IOMMU_FLUSHINV;
48
49 /* We use the main control/status register of FIRE as the write
50 * completion register.
51 */
52 iommu->write_complete_reg = pbm->controller_regs + 0x410000UL;
53
54 /*
55 * Invalidate TLB Entries.
56 */
57 upa_writeq(~(u64)0, iommu->iommu_flushinv);
58
59 err = iommu_table_init(iommu, tsbsize * 8 * 1024, vdma[0], dma_mask,
60 pbm->numa_node);
61 if (err)
62 return err;
63
64 upa_writeq(__pa(iommu->page_table) | 0x7UL, iommu->iommu_tsbbase);
65
66 control = upa_readq(iommu->iommu_control);
67 control |= (0x00000400 /* TSB cache snoop enable */ |
68 0x00000300 /* Cache mode */ |
69 0x00000002 /* Bypass enable */ |
70 0x00000001 /* Translation enable */);
71 upa_writeq(control, iommu->iommu_control);
72
73 return 0;
74 }
75
76 #ifdef CONFIG_PCI_MSI
77 struct pci_msiq_entry {
78 u64 word0;
79 #define MSIQ_WORD0_RESV 0x8000000000000000UL
80 #define MSIQ_WORD0_FMT_TYPE 0x7f00000000000000UL
81 #define MSIQ_WORD0_FMT_TYPE_SHIFT 56
82 #define MSIQ_WORD0_LEN 0x00ffc00000000000UL
83 #define MSIQ_WORD0_LEN_SHIFT 46
84 #define MSIQ_WORD0_ADDR0 0x00003fff00000000UL
85 #define MSIQ_WORD0_ADDR0_SHIFT 32
86 #define MSIQ_WORD0_RID 0x00000000ffff0000UL
87 #define MSIQ_WORD0_RID_SHIFT 16
88 #define MSIQ_WORD0_DATA0 0x000000000000ffffUL
89 #define MSIQ_WORD0_DATA0_SHIFT 0
90
91 #define MSIQ_TYPE_MSG 0x6
92 #define MSIQ_TYPE_MSI32 0xb
93 #define MSIQ_TYPE_MSI64 0xf
94
95 u64 word1;
96 #define MSIQ_WORD1_ADDR1 0xffffffffffff0000UL
97 #define MSIQ_WORD1_ADDR1_SHIFT 16
98 #define MSIQ_WORD1_DATA1 0x000000000000ffffUL
99 #define MSIQ_WORD1_DATA1_SHIFT 0
100
101 u64 resv[6];
102 };
103
104 /* All MSI registers are offset from pbm->pbm_regs */
105 #define EVENT_QUEUE_BASE_ADDR_REG 0x010000UL
106 #define EVENT_QUEUE_BASE_ADDR_ALL_ONES 0xfffc000000000000UL
107
108 #define EVENT_QUEUE_CONTROL_SET(EQ) (0x011000UL + (EQ) * 0x8UL)
109 #define EVENT_QUEUE_CONTROL_SET_OFLOW 0x0200000000000000UL
110 #define EVENT_QUEUE_CONTROL_SET_EN 0x0000100000000000UL
111
112 #define EVENT_QUEUE_CONTROL_CLEAR(EQ) (0x011200UL + (EQ) * 0x8UL)
113 #define EVENT_QUEUE_CONTROL_CLEAR_OF 0x0200000000000000UL
114 #define EVENT_QUEUE_CONTROL_CLEAR_E2I 0x0000800000000000UL
115 #define EVENT_QUEUE_CONTROL_CLEAR_DIS 0x0000100000000000UL
116
117 #define EVENT_QUEUE_STATE(EQ) (0x011400UL + (EQ) * 0x8UL)
118 #define EVENT_QUEUE_STATE_MASK 0x0000000000000007UL
119 #define EVENT_QUEUE_STATE_IDLE 0x0000000000000001UL
120 #define EVENT_QUEUE_STATE_ACTIVE 0x0000000000000002UL
121 #define EVENT_QUEUE_STATE_ERROR 0x0000000000000004UL
122
123 #define EVENT_QUEUE_TAIL(EQ) (0x011600UL + (EQ) * 0x8UL)
124 #define EVENT_QUEUE_TAIL_OFLOW 0x0200000000000000UL
125 #define EVENT_QUEUE_TAIL_VAL 0x000000000000007fUL
126
127 #define EVENT_QUEUE_HEAD(EQ) (0x011800UL + (EQ) * 0x8UL)
128 #define EVENT_QUEUE_HEAD_VAL 0x000000000000007fUL
129
130 #define MSI_MAP(MSI) (0x020000UL + (MSI) * 0x8UL)
131 #define MSI_MAP_VALID 0x8000000000000000UL
132 #define MSI_MAP_EQWR_N 0x4000000000000000UL
133 #define MSI_MAP_EQNUM 0x000000000000003fUL
134
135 #define MSI_CLEAR(MSI) (0x028000UL + (MSI) * 0x8UL)
136 #define MSI_CLEAR_EQWR_N 0x4000000000000000UL
137
138 #define IMONDO_DATA0 0x02C000UL
139 #define IMONDO_DATA0_DATA 0xffffffffffffffc0UL
140
141 #define IMONDO_DATA1 0x02C008UL
142 #define IMONDO_DATA1_DATA 0xffffffffffffffffUL
143
144 #define MSI_32BIT_ADDR 0x034000UL
145 #define MSI_32BIT_ADDR_VAL 0x00000000ffff0000UL
146
147 #define MSI_64BIT_ADDR 0x034008UL
148 #define MSI_64BIT_ADDR_VAL 0xffffffffffff0000UL
149
150 static int pci_fire_get_head(struct pci_pbm_info *pbm, unsigned long msiqid,
151 unsigned long *head)
152 {
153 *head = upa_readq(pbm->pbm_regs + EVENT_QUEUE_HEAD(msiqid));
154 return 0;
155 }
156
157 static int pci_fire_dequeue_msi(struct pci_pbm_info *pbm, unsigned long msiqid,
158 unsigned long *head, unsigned long *msi)
159 {
160 unsigned long type_fmt, type, msi_num;
161 struct pci_msiq_entry *base, *ep;
162
163 base = (pbm->msi_queues + ((msiqid - pbm->msiq_first) * 8192));
164 ep = &base[*head];
165
166 if ((ep->word0 & MSIQ_WORD0_FMT_TYPE) == 0)
167 return 0;
168
169 type_fmt = ((ep->word0 & MSIQ_WORD0_FMT_TYPE) >>
170 MSIQ_WORD0_FMT_TYPE_SHIFT);
171 type = (type_fmt >> 3);
172 if (unlikely(type != MSIQ_TYPE_MSI32 &&
173 type != MSIQ_TYPE_MSI64))
174 return -EINVAL;
175
176 *msi = msi_num = ((ep->word0 & MSIQ_WORD0_DATA0) >>
177 MSIQ_WORD0_DATA0_SHIFT);
178
179 upa_writeq(MSI_CLEAR_EQWR_N, pbm->pbm_regs + MSI_CLEAR(msi_num));
180
181 /* Clear the entry. */
182 ep->word0 &= ~MSIQ_WORD0_FMT_TYPE;
183
184 /* Go to next entry in ring. */
185 (*head)++;
186 if (*head >= pbm->msiq_ent_count)
187 *head = 0;
188
189 return 1;
190 }
191
192 static int pci_fire_set_head(struct pci_pbm_info *pbm, unsigned long msiqid,
193 unsigned long head)
194 {
195 upa_writeq(head, pbm->pbm_regs + EVENT_QUEUE_HEAD(msiqid));
196 return 0;
197 }
198
199 static int pci_fire_msi_setup(struct pci_pbm_info *pbm, unsigned long msiqid,
200 unsigned long msi, int is_msi64)
201 {
202 u64 val;
203
204 val = upa_readq(pbm->pbm_regs + MSI_MAP(msi));
205 val &= ~(MSI_MAP_EQNUM);
206 val |= msiqid;
207 upa_writeq(val, pbm->pbm_regs + MSI_MAP(msi));
208
209 upa_writeq(MSI_CLEAR_EQWR_N, pbm->pbm_regs + MSI_CLEAR(msi));
210
211 val = upa_readq(pbm->pbm_regs + MSI_MAP(msi));
212 val |= MSI_MAP_VALID;
213 upa_writeq(val, pbm->pbm_regs + MSI_MAP(msi));
214
215 return 0;
216 }
217
218 static int pci_fire_msi_teardown(struct pci_pbm_info *pbm, unsigned long msi)
219 {
220 u64 val;
221
222 val = upa_readq(pbm->pbm_regs + MSI_MAP(msi));
223
224 val &= ~MSI_MAP_VALID;
225
226 upa_writeq(val, pbm->pbm_regs + MSI_MAP(msi));
227
228 return 0;
229 }
230
231 static int pci_fire_msiq_alloc(struct pci_pbm_info *pbm)
232 {
233 unsigned long pages, order, i;
234
235 order = get_order(512 * 1024);
236 pages = __get_free_pages(GFP_KERNEL | __GFP_COMP, order);
237 if (pages == 0UL) {
238 printk(KERN_ERR "MSI: Cannot allocate MSI queues (o=%lu).\n",
239 order);
240 return -ENOMEM;
241 }
242 memset((char *)pages, 0, PAGE_SIZE << order);
243 pbm->msi_queues = (void *) pages;
244
245 upa_writeq((EVENT_QUEUE_BASE_ADDR_ALL_ONES |
246 __pa(pbm->msi_queues)),
247 pbm->pbm_regs + EVENT_QUEUE_BASE_ADDR_REG);
248
249 upa_writeq(pbm->portid << 6, pbm->pbm_regs + IMONDO_DATA0);
250 upa_writeq(0, pbm->pbm_regs + IMONDO_DATA1);
251
252 upa_writeq(pbm->msi32_start, pbm->pbm_regs + MSI_32BIT_ADDR);
253 upa_writeq(pbm->msi64_start, pbm->pbm_regs + MSI_64BIT_ADDR);
254
255 for (i = 0; i < pbm->msiq_num; i++) {
256 upa_writeq(0, pbm->pbm_regs + EVENT_QUEUE_HEAD(i));
257 upa_writeq(0, pbm->pbm_regs + EVENT_QUEUE_TAIL(i));
258 }
259
260 return 0;
261 }
262
263 static void pci_fire_msiq_free(struct pci_pbm_info *pbm)
264 {
265 unsigned long pages, order;
266
267 order = get_order(512 * 1024);
268 pages = (unsigned long) pbm->msi_queues;
269
270 free_pages(pages, order);
271
272 pbm->msi_queues = NULL;
273 }
274
275 static int pci_fire_msiq_build_irq(struct pci_pbm_info *pbm,
276 unsigned long msiqid,
277 unsigned long devino)
278 {
279 unsigned long cregs = (unsigned long) pbm->pbm_regs;
280 unsigned long imap_reg, iclr_reg, int_ctrlr;
281 unsigned int irq;
282 int fixup;
283 u64 val;
284
285 imap_reg = cregs + (0x001000UL + (devino * 0x08UL));
286 iclr_reg = cregs + (0x001400UL + (devino * 0x08UL));
287
288 /* XXX iterate amongst the 4 IRQ controllers XXX */
289 int_ctrlr = (1UL << 6);
290
291 val = upa_readq(imap_reg);
292 val |= (1UL << 63) | int_ctrlr;
293 upa_writeq(val, imap_reg);
294
295 fixup = ((pbm->portid << 6) | devino) - int_ctrlr;
296
297 irq = build_irq(fixup, iclr_reg, imap_reg);
298 if (!irq)
299 return -ENOMEM;
300
301 upa_writeq(EVENT_QUEUE_CONTROL_SET_EN,
302 pbm->pbm_regs + EVENT_QUEUE_CONTROL_SET(msiqid));
303
304 return irq;
305 }
306
307 static const struct sparc64_msiq_ops pci_fire_msiq_ops = {
308 .get_head = pci_fire_get_head,
309 .dequeue_msi = pci_fire_dequeue_msi,
310 .set_head = pci_fire_set_head,
311 .msi_setup = pci_fire_msi_setup,
312 .msi_teardown = pci_fire_msi_teardown,
313 .msiq_alloc = pci_fire_msiq_alloc,
314 .msiq_free = pci_fire_msiq_free,
315 .msiq_build_irq = pci_fire_msiq_build_irq,
316 };
317
318 static void pci_fire_msi_init(struct pci_pbm_info *pbm)
319 {
320 sparc64_pbm_msi_init(pbm, &pci_fire_msiq_ops);
321 }
322 #else /* CONFIG_PCI_MSI */
323 static void pci_fire_msi_init(struct pci_pbm_info *pbm)
324 {
325 }
326 #endif /* !(CONFIG_PCI_MSI) */
327
328 /* Based at pbm->controller_regs */
329 #define FIRE_PARITY_CONTROL 0x470010UL
330 #define FIRE_PARITY_ENAB 0x8000000000000000UL
331 #define FIRE_FATAL_RESET_CTL 0x471028UL
332 #define FIRE_FATAL_RESET_SPARE 0x0000000004000000UL
333 #define FIRE_FATAL_RESET_MB 0x0000000002000000UL
334 #define FIRE_FATAL_RESET_CPE 0x0000000000008000UL
335 #define FIRE_FATAL_RESET_APE 0x0000000000004000UL
336 #define FIRE_FATAL_RESET_PIO 0x0000000000000040UL
337 #define FIRE_FATAL_RESET_JW 0x0000000000000004UL
338 #define FIRE_FATAL_RESET_JI 0x0000000000000002UL
339 #define FIRE_FATAL_RESET_JR 0x0000000000000001UL
340 #define FIRE_CORE_INTR_ENABLE 0x471800UL
341
342 /* Based at pbm->pbm_regs */
343 #define FIRE_TLU_CTRL 0x80000UL
344 #define FIRE_TLU_CTRL_TIM 0x00000000da000000UL
345 #define FIRE_TLU_CTRL_QDET 0x0000000000000100UL
346 #define FIRE_TLU_CTRL_CFG 0x0000000000000001UL
347 #define FIRE_TLU_DEV_CTRL 0x90008UL
348 #define FIRE_TLU_LINK_CTRL 0x90020UL
349 #define FIRE_TLU_LINK_CTRL_CLK 0x0000000000000040UL
350 #define FIRE_LPU_RESET 0xe2008UL
351 #define FIRE_LPU_LLCFG 0xe2200UL
352 #define FIRE_LPU_LLCFG_VC0 0x0000000000000100UL
353 #define FIRE_LPU_FCTRL_UCTRL 0xe2240UL
354 #define FIRE_LPU_FCTRL_UCTRL_N 0x0000000000000002UL
355 #define FIRE_LPU_FCTRL_UCTRL_P 0x0000000000000001UL
356 #define FIRE_LPU_TXL_FIFOP 0xe2430UL
357 #define FIRE_LPU_LTSSM_CFG2 0xe2788UL
358 #define FIRE_LPU_LTSSM_CFG3 0xe2790UL
359 #define FIRE_LPU_LTSSM_CFG4 0xe2798UL
360 #define FIRE_LPU_LTSSM_CFG5 0xe27a0UL
361 #define FIRE_DMC_IENAB 0x31800UL
362 #define FIRE_DMC_DBG_SEL_A 0x53000UL
363 #define FIRE_DMC_DBG_SEL_B 0x53008UL
364 #define FIRE_PEC_IENAB 0x51800UL
365
366 static void pci_fire_hw_init(struct pci_pbm_info *pbm)
367 {
368 u64 val;
369
370 upa_writeq(FIRE_PARITY_ENAB,
371 pbm->controller_regs + FIRE_PARITY_CONTROL);
372
373 upa_writeq((FIRE_FATAL_RESET_SPARE |
374 FIRE_FATAL_RESET_MB |
375 FIRE_FATAL_RESET_CPE |
376 FIRE_FATAL_RESET_APE |
377 FIRE_FATAL_RESET_PIO |
378 FIRE_FATAL_RESET_JW |
379 FIRE_FATAL_RESET_JI |
380 FIRE_FATAL_RESET_JR),
381 pbm->controller_regs + FIRE_FATAL_RESET_CTL);
382
383 upa_writeq(~(u64)0, pbm->controller_regs + FIRE_CORE_INTR_ENABLE);
384
385 val = upa_readq(pbm->pbm_regs + FIRE_TLU_CTRL);
386 val |= (FIRE_TLU_CTRL_TIM |
387 FIRE_TLU_CTRL_QDET |
388 FIRE_TLU_CTRL_CFG);
389 upa_writeq(val, pbm->pbm_regs + FIRE_TLU_CTRL);
390 upa_writeq(0, pbm->pbm_regs + FIRE_TLU_DEV_CTRL);
391 upa_writeq(FIRE_TLU_LINK_CTRL_CLK,
392 pbm->pbm_regs + FIRE_TLU_LINK_CTRL);
393
394 upa_writeq(0, pbm->pbm_regs + FIRE_LPU_RESET);
395 upa_writeq(FIRE_LPU_LLCFG_VC0, pbm->pbm_regs + FIRE_LPU_LLCFG);
396 upa_writeq((FIRE_LPU_FCTRL_UCTRL_N | FIRE_LPU_FCTRL_UCTRL_P),
397 pbm->pbm_regs + FIRE_LPU_FCTRL_UCTRL);
398 upa_writeq(((0xffff << 16) | (0x0000 << 0)),
399 pbm->pbm_regs + FIRE_LPU_TXL_FIFOP);
400 upa_writeq(3000000, pbm->pbm_regs + FIRE_LPU_LTSSM_CFG2);
401 upa_writeq(500000, pbm->pbm_regs + FIRE_LPU_LTSSM_CFG3);
402 upa_writeq((2 << 16) | (140 << 8),
403 pbm->pbm_regs + FIRE_LPU_LTSSM_CFG4);
404 upa_writeq(0, pbm->pbm_regs + FIRE_LPU_LTSSM_CFG5);
405
406 upa_writeq(~(u64)0, pbm->pbm_regs + FIRE_DMC_IENAB);
407 upa_writeq(0, pbm->pbm_regs + FIRE_DMC_DBG_SEL_A);
408 upa_writeq(0, pbm->pbm_regs + FIRE_DMC_DBG_SEL_B);
409
410 upa_writeq(~(u64)0, pbm->pbm_regs + FIRE_PEC_IENAB);
411 }
412
413 static int pci_fire_pbm_init(struct pci_pbm_info *pbm,
414 struct platform_device *op, u32 portid)
415 {
416 const struct linux_prom64_registers *regs;
417 struct device_node *dp = op->dev.of_node;
418 int err;
419
420 pbm->numa_node = NUMA_NO_NODE;
421
422 pbm->pci_ops = &sun4u_pci_ops;
423 pbm->config_space_reg_bits = 12;
424
425 pbm->index = pci_num_pbms++;
426
427 pbm->portid = portid;
428 pbm->op = op;
429 pbm->name = dp->full_name;
430
431 regs = of_get_property(dp, "reg", NULL);
432 pbm->pbm_regs = regs[0].phys_addr;
433 pbm->controller_regs = regs[1].phys_addr - 0x410000UL;
434
435 printk("%s: SUN4U PCIE Bus Module\n", pbm->name);
436
437 pci_determine_mem_io_space(pbm);
438
439 pci_get_pbm_props(pbm);
440
441 pci_fire_hw_init(pbm);
442
443 err = pci_fire_pbm_iommu_init(pbm);
444 if (err)
445 return err;
446
447 pci_fire_msi_init(pbm);
448
449 pbm->pci_bus = pci_scan_one_pbm(pbm, &op->dev);
450
451 /* XXX register error interrupt handlers XXX */
452
453 pbm->next = pci_pbm_root;
454 pci_pbm_root = pbm;
455
456 return 0;
457 }
458
459 static int fire_probe(struct platform_device *op)
460 {
461 struct device_node *dp = op->dev.of_node;
462 struct pci_pbm_info *pbm;
463 struct iommu *iommu;
464 u32 portid;
465 int err;
466
467 portid = of_getintprop_default(dp, "portid", 0xff);
468
469 err = -ENOMEM;
470 pbm = kzalloc(sizeof(*pbm), GFP_KERNEL);
471 if (!pbm) {
472 printk(KERN_ERR PFX "Cannot allocate pci_pbminfo.\n");
473 goto out_err;
474 }
475
476 iommu = kzalloc(sizeof(struct iommu), GFP_KERNEL);
477 if (!iommu) {
478 printk(KERN_ERR PFX "Cannot allocate PBM iommu.\n");
479 goto out_free_controller;
480 }
481
482 pbm->iommu = iommu;
483
484 err = pci_fire_pbm_init(pbm, op, portid);
485 if (err)
486 goto out_free_iommu;
487
488 dev_set_drvdata(&op->dev, pbm);
489
490 return 0;
491
492 out_free_iommu:
493 kfree(pbm->iommu);
494
495 out_free_controller:
496 kfree(pbm);
497
498 out_err:
499 return err;
500 }
501
502 static const struct of_device_id fire_match[] = {
503 {
504 .name = "pci",
505 .compatible = "pciex108e,80f0",
506 },
507 {},
508 };
509
510 static struct platform_driver fire_driver = {
511 .driver = {
512 .name = DRIVER_NAME,
513 .of_match_table = fire_match,
514 },
515 .probe = fire_probe,
516 };
517
518 static int __init fire_init(void)
519 {
520 return platform_driver_register(&fire_driver);
521 }
522
523 subsys_initcall(fire_init);
Linux with added FPC-III support