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powercap: restrict energy meter to root access
[linux/fpc-iii.git] / drivers / misc / spear13xx_pcie_gadget.c
blobee120dcbb3e6ba9b842859496d565129d66c1fd8
1 /*
2 * drivers/misc/spear13xx_pcie_gadget.c
3 *
4 * Copyright (C) 2010 ST Microelectronics
5 * Pratyush Anand<pratyush.anand@gmail.com>
6 *
7 * This file is licensed under the terms of the GNU General Public
8 * License version 2. This program is licensed "as is" without any
9 * warranty of any kind, whether express or implied.
10 */
11
12 #include <linux/device.h>
13 #include <linux/clk.h>
14 #include <linux/slab.h>
15 #include <linux/delay.h>
16 #include <linux/io.h>
17 #include <linux/interrupt.h>
18 #include <linux/irq.h>
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/platform_device.h>
22 #include <linux/pci_regs.h>
23 #include <linux/configfs.h>
24 #include <mach/pcie.h>
25 #include <mach/misc_regs.h>
26
27 #define IN0_MEM_SIZE (200 * 1024 * 1024 - 1)
28 /* In current implementation address translation is done using IN0 only.
29 * So IN1 start address and IN0 end address has been kept same
30 */
31 #define IN1_MEM_SIZE (0 * 1024 * 1024 - 1)
32 #define IN_IO_SIZE (20 * 1024 * 1024 - 1)
33 #define IN_CFG0_SIZE (12 * 1024 * 1024 - 1)
34 #define IN_CFG1_SIZE (12 * 1024 * 1024 - 1)
35 #define IN_MSG_SIZE (12 * 1024 * 1024 - 1)
36 /* Keep default BAR size as 4K*/
37 /* AORAM would be mapped by default*/
38 #define INBOUND_ADDR_MASK (SPEAR13XX_SYSRAM1_SIZE - 1)
39
40 #define INT_TYPE_NO_INT 0
41 #define INT_TYPE_INTX 1
42 #define INT_TYPE_MSI 2
43 struct spear_pcie_gadget_config {
44 void __iomem *base;
45 void __iomem *va_app_base;
46 void __iomem *va_dbi_base;
47 char int_type[10];
48 ulong requested_msi;
49 ulong configured_msi;
50 ulong bar0_size;
51 ulong bar0_rw_offset;
52 void __iomem *va_bar0_address;
53 };
54
55 struct pcie_gadget_target {
56 struct configfs_subsystem subsys;
57 struct spear_pcie_gadget_config config;
58 };
59
60 struct pcie_gadget_target_attr {
61 struct configfs_attribute attr;
62 ssize_t (*show)(struct spear_pcie_gadget_config *config,
63 char *buf);
64 ssize_t (*store)(struct spear_pcie_gadget_config *config,
65 const char *buf,
66 size_t count);
67 };
68
69 static void enable_dbi_access(struct pcie_app_reg __iomem *app_reg)
70 {
71 /* Enable DBI access */
72 writel(readl(&app_reg->slv_armisc) | (1 << AXI_OP_DBI_ACCESS_ID),
73 &app_reg->slv_armisc);
74 writel(readl(&app_reg->slv_awmisc) | (1 << AXI_OP_DBI_ACCESS_ID),
75 &app_reg->slv_awmisc);
76
77 }
78
79 static void disable_dbi_access(struct pcie_app_reg __iomem *app_reg)
80 {
81 /* disable DBI access */
82 writel(readl(&app_reg->slv_armisc) & ~(1 << AXI_OP_DBI_ACCESS_ID),
83 &app_reg->slv_armisc);
84 writel(readl(&app_reg->slv_awmisc) & ~(1 << AXI_OP_DBI_ACCESS_ID),
85 &app_reg->slv_awmisc);
86
87 }
88
89 static void spear_dbi_read_reg(struct spear_pcie_gadget_config *config,
90 int where, int size, u32 *val)
91 {
92 struct pcie_app_reg __iomem *app_reg = config->va_app_base;
93 ulong va_address;
94
95 /* Enable DBI access */
96 enable_dbi_access(app_reg);
97
98 va_address = (ulong)config->va_dbi_base + (where & ~0x3);
99
100 *val = readl(va_address);
101
102 if (size == 1)
103 *val = (*val >> (8 * (where & 3))) & 0xff;
104 else if (size == 2)
105 *val = (*val >> (8 * (where & 3))) & 0xffff;
106
107 /* Disable DBI access */
108 disable_dbi_access(app_reg);
109 }
110
111 static void spear_dbi_write_reg(struct spear_pcie_gadget_config *config,
112 int where, int size, u32 val)
113 {
114 struct pcie_app_reg __iomem *app_reg = config->va_app_base;
115 ulong va_address;
116
117 /* Enable DBI access */
118 enable_dbi_access(app_reg);
119
120 va_address = (ulong)config->va_dbi_base + (where & ~0x3);
121
122 if (size == 4)
123 writel(val, va_address);
124 else if (size == 2)
125 writew(val, va_address + (where & 2));
126 else if (size == 1)
127 writeb(val, va_address + (where & 3));
128
129 /* Disable DBI access */
130 disable_dbi_access(app_reg);
131 }
132
133 #define PCI_FIND_CAP_TTL 48
134
135 static int pci_find_own_next_cap_ttl(struct spear_pcie_gadget_config *config,
136 u32 pos, int cap, int *ttl)
137 {
138 u32 id;
139
140 while ((*ttl)--) {
141 spear_dbi_read_reg(config, pos, 1, &pos);
142 if (pos < 0x40)
143 break;
144 pos &= ~3;
145 spear_dbi_read_reg(config, pos + PCI_CAP_LIST_ID, 1, &id);
146 if (id == 0xff)
147 break;
148 if (id == cap)
149 return pos;
150 pos += PCI_CAP_LIST_NEXT;
151 }
152 return 0;
153 }
154
155 static int pci_find_own_next_cap(struct spear_pcie_gadget_config *config,
156 u32 pos, int cap)
157 {
158 int ttl = PCI_FIND_CAP_TTL;
159
160 return pci_find_own_next_cap_ttl(config, pos, cap, &ttl);
161 }
162
163 static int pci_find_own_cap_start(struct spear_pcie_gadget_config *config,
164 u8 hdr_type)
165 {
166 u32 status;
167
168 spear_dbi_read_reg(config, PCI_STATUS, 2, &status);
169 if (!(status & PCI_STATUS_CAP_LIST))
170 return 0;
171
172 switch (hdr_type) {
173 case PCI_HEADER_TYPE_NORMAL:
174 case PCI_HEADER_TYPE_BRIDGE:
175 return PCI_CAPABILITY_LIST;
176 case PCI_HEADER_TYPE_CARDBUS:
177 return PCI_CB_CAPABILITY_LIST;
178 default:
179 return 0;
180 }
181
182 return 0;
183 }
184
185 /*
186 * Tell if a device supports a given PCI capability.
187 * Returns the address of the requested capability structure within the
188 * device's PCI configuration space or 0 in case the device does not
189 * support it. Possible values for @cap:
190 *
191 * %PCI_CAP_ID_PM Power Management
192 * %PCI_CAP_ID_AGP Accelerated Graphics Port
193 * %PCI_CAP_ID_VPD Vital Product Data
194 * %PCI_CAP_ID_SLOTID Slot Identification
195 * %PCI_CAP_ID_MSI Message Signalled Interrupts
196 * %PCI_CAP_ID_CHSWP CompactPCI HotSwap
197 * %PCI_CAP_ID_PCIX PCI-X
198 * %PCI_CAP_ID_EXP PCI Express
199 */
200 static int pci_find_own_capability(struct spear_pcie_gadget_config *config,
201 int cap)
202 {
203 u32 pos;
204 u32 hdr_type;
205
206 spear_dbi_read_reg(config, PCI_HEADER_TYPE, 1, &hdr_type);
207
208 pos = pci_find_own_cap_start(config, hdr_type);
209 if (pos)
210 pos = pci_find_own_next_cap(config, pos, cap);
211
212 return pos;
213 }
214
215 static irqreturn_t spear_pcie_gadget_irq(int irq, void *dev_id)
216 {
217 return 0;
218 }
219
220 /*
221 * configfs interfaces show/store functions
222 */
223
224 static struct pcie_gadget_target *to_target(struct config_item *item)
225 {
226 return item ?
227 container_of(to_configfs_subsystem(to_config_group(item)),
228 struct pcie_gadget_target, subsys) : NULL;
229 }
230
231 static ssize_t pcie_gadget_link_show(struct config_item *item, char *buf)
232 {
233 struct pcie_app_reg __iomem *app_reg = to_target(item)->va_app_base;
234
235 if (readl(&app_reg->app_status_1) & ((u32)1 << XMLH_LINK_UP_ID))
236 return sprintf(buf, "UP");
237 else
238 return sprintf(buf, "DOWN");
239 }
240
241 static ssize_t pcie_gadget_link_store(struct config_item *item,
242 const char *buf, size_t count)
243 {
244 struct pcie_app_reg __iomem *app_reg = to_target(item)->va_app_base;
245
246 if (sysfs_streq(buf, "UP"))
247 writel(readl(&app_reg->app_ctrl_0) | (1 << APP_LTSSM_ENABLE_ID),
248 &app_reg->app_ctrl_0);
249 else if (sysfs_streq(buf, "DOWN"))
250 writel(readl(&app_reg->app_ctrl_0)
251 & ~(1 << APP_LTSSM_ENABLE_ID),
252 &app_reg->app_ctrl_0);
253 else
254 return -EINVAL;
255 return count;
256 }
257
258 static ssize_t pcie_gadget_int_type_show(struct config_item *item, char *buf)
259 {
260 return sprintf(buf, "%s", to_target(item)->int_type);
261 }
262
263 static ssize_t pcie_gadget_int_type_store(struct config_item *item,
264 const char *buf, size_t count)
265 {
266 struct spear_pcie_gadget_config *config = to_target(item)
267 u32 cap, vec, flags;
268 ulong vector;
269
270 if (sysfs_streq(buf, "INTA"))
271 spear_dbi_write_reg(config, PCI_INTERRUPT_LINE, 1, 1);
272
273 else if (sysfs_streq(buf, "MSI")) {
274 vector = config->requested_msi;
275 vec = 0;
276 while (vector > 1) {
277 vector /= 2;
278 vec++;
279 }
280 spear_dbi_write_reg(config, PCI_INTERRUPT_LINE, 1, 0);
281 cap = pci_find_own_capability(config, PCI_CAP_ID_MSI);
282 spear_dbi_read_reg(config, cap + PCI_MSI_FLAGS, 1, &flags);
283 flags &= ~PCI_MSI_FLAGS_QMASK;
284 flags |= vec << 1;
285 spear_dbi_write_reg(config, cap + PCI_MSI_FLAGS, 1, flags);
286 } else
287 return -EINVAL;
288
289 strcpy(config->int_type, buf);
290
291 return count;
292 }
293
294 static ssize_t pcie_gadget_no_of_msi_show(struct config_item *item, char *buf)
295 {
296 struct spear_pcie_gadget_config *config = to_target(item)
297 struct pcie_app_reg __iomem *app_reg = to_target(item)->va_app_base;
298 u32 cap, vec, flags;
299 ulong vector;
300
301 if ((readl(&app_reg->msg_status) & (1 << CFG_MSI_EN_ID))
302 != (1 << CFG_MSI_EN_ID))
303 vector = 0;
304 else {
305 cap = pci_find_own_capability(config, PCI_CAP_ID_MSI);
306 spear_dbi_read_reg(config, cap + PCI_MSI_FLAGS, 1, &flags);
307 flags &= ~PCI_MSI_FLAGS_QSIZE;
308 vec = flags >> 4;
309 vector = 1;
310 while (vec--)
311 vector *= 2;
312 }
313 config->configured_msi = vector;
314
315 return sprintf(buf, "%lu", vector);
316 }
317
318 static ssize_t pcie_gadget_no_of_msi_store(struct config_item *item,
319 const char *buf, size_t count)
320 {
321 int ret;
322
323 ret = kstrtoul(buf, 0, &to_target(item)->requested_msi);
324 if (ret)
325 return ret;
326
327 if (config->requested_msi > 32)
328 config->requested_msi = 32;
329
330 return count;
331 }
332
333 static ssize_t pcie_gadget_inta_store(struct config_item *item,
334 const char *buf, size_t count)
335 {
336 struct pcie_app_reg __iomem *app_reg = to_target(item)->va_app_base;
337 ulong en;
338 int ret;
339
340 ret = kstrtoul(buf, 0, &en);
341 if (ret)
342 return ret;
343
344 if (en)
345 writel(readl(&app_reg->app_ctrl_0) | (1 << SYS_INT_ID),
346 &app_reg->app_ctrl_0);
347 else
348 writel(readl(&app_reg->app_ctrl_0) & ~(1 << SYS_INT_ID),
349 &app_reg->app_ctrl_0);
350
351 return count;
352 }
353
354 static ssize_t pcie_gadget_send_msi_store(struct config_item *item,
355 const char *buf, size_t count)
356 {
357 struct spear_pcie_gadget_config *config = to_target(item)
358 struct pcie_app_reg __iomem *app_reg = config->va_app_base;
359 ulong vector;
360 u32 ven_msi;
361 int ret;
362
363 ret = kstrtoul(buf, 0, &vector);
364 if (ret)
365 return ret;
366
367 if (!config->configured_msi)
368 return -EINVAL;
369
370 if (vector >= config->configured_msi)
371 return -EINVAL;
372
373 ven_msi = readl(&app_reg->ven_msi_1);
374 ven_msi &= ~VEN_MSI_FUN_NUM_MASK;
375 ven_msi |= 0 << VEN_MSI_FUN_NUM_ID;
376 ven_msi &= ~VEN_MSI_TC_MASK;
377 ven_msi |= 0 << VEN_MSI_TC_ID;
378 ven_msi &= ~VEN_MSI_VECTOR_MASK;
379 ven_msi |= vector << VEN_MSI_VECTOR_ID;
380
381 /* generating interrupt for msi vector */
382 ven_msi |= VEN_MSI_REQ_EN;
383 writel(ven_msi, &app_reg->ven_msi_1);
384 udelay(1);
385 ven_msi &= ~VEN_MSI_REQ_EN;
386 writel(ven_msi, &app_reg->ven_msi_1);
387
388 return count;
389 }
390
391 static ssize_t pcie_gadget_vendor_id_show(struct config_item *item, char *buf)
392 {
393 u32 id;
394
395 spear_dbi_read_reg(to_target(item), PCI_VENDOR_ID, 2, &id);
396
397 return sprintf(buf, "%x", id);
398 }
399
400 static ssize_t pcie_gadget_vendor_id_store(struct config_item *item,
401 const char *buf, size_t count)
402 {
403 ulong id;
404 int ret;
405
406 ret = kstrtoul(buf, 0, &id);
407 if (ret)
408 return ret;
409
410 spear_dbi_write_reg(to_target(item), PCI_VENDOR_ID, 2, id);
411
412 return count;
413 }
414
415 static ssize_t pcie_gadget_device_id_show(struct config_item *item, char *buf)
416 {
417 u32 id;
418
419 spear_dbi_read_reg(to_target(item), PCI_DEVICE_ID, 2, &id);
420
421 return sprintf(buf, "%x", id);
422 }
423
424 static ssize_t pcie_gadget_device_id_store(struct config_item *item,
425 const char *buf, size_t count)
426 {
427 ulong id;
428 int ret;
429
430 ret = kstrtoul(buf, 0, &id);
431 if (ret)
432 return ret;
433
434 spear_dbi_write_reg(to_target(item), PCI_DEVICE_ID, 2, id);
435
436 return count;
437 }
438
439 static ssize_t pcie_gadget_bar0_size_show(struct config_item *item, char *buf)
440 {
441 return sprintf(buf, "%lx", to_target(item)->bar0_size);
442 }
443
444 static ssize_t pcie_gadget_bar0_size_store(struct config_item *item,
445 const char *buf, size_t count)
446 {
447 struct spear_pcie_gadget_config *config = to_target(item)
448 ulong size;
449 u32 pos, pos1;
450 u32 no_of_bit = 0;
451 int ret;
452
453 ret = kstrtoul(buf, 0, &size);
454 if (ret)
455 return ret;
456
457 /* min bar size is 256 */
458 if (size <= 0x100)
459 size = 0x100;
460 /* max bar size is 1MB*/
461 else if (size >= 0x100000)
462 size = 0x100000;
463 else {
464 pos = 0;
465 pos1 = 0;
466 while (pos < 21) {
467 pos = find_next_bit((ulong *)&size, 21, pos);
468 if (pos != 21)
469 pos1 = pos + 1;
470 pos++;
471 no_of_bit++;
472 }
473 if (no_of_bit == 2)
474 pos1--;
475
476 size = 1 << pos1;
477 }
478 config->bar0_size = size;
479 spear_dbi_write_reg(config, PCIE_BAR0_MASK_REG, 4, size - 1);
480
481 return count;
482 }
483
484 static ssize_t pcie_gadget_bar0_address_show(struct config_item *item,
485 char *buf)
486 {
487 struct pcie_app_reg __iomem *app_reg = to_target(item)->va_app_base;
488
489 u32 address = readl(&app_reg->pim0_mem_addr_start);
490
491 return sprintf(buf, "%x", address);
492 }
493
494 static ssize_t pcie_gadget_bar0_address_store(struct config_item *item,
495 const char *buf, size_t count)
496 {
497 struct spear_pcie_gadget_config *config = to_target(item)
498 struct pcie_app_reg __iomem *app_reg = config->va_app_base;
499 ulong address;
500 int ret;
501
502 ret = kstrtoul(buf, 0, &address);
503 if (ret)
504 return ret;
505
506 address &= ~(config->bar0_size - 1);
507 if (config->va_bar0_address)
508 iounmap(config->va_bar0_address);
509 config->va_bar0_address = ioremap(address, config->bar0_size);
510 if (!config->va_bar0_address)
511 return -ENOMEM;
512
513 writel(address, &app_reg->pim0_mem_addr_start);
514
515 return count;
516 }
517
518 static ssize_t pcie_gadget_bar0_rw_offset_show(struct config_item *item,
519 char *buf)
520 {
521 return sprintf(buf, "%lx", to_target(item)->bar0_rw_offset);
522 }
523
524 static ssize_t pcie_gadget_bar0_rw_offset_store(struct config_item *item,
525 const char *buf, size_t count)
526 {
527 ulong offset;
528 int ret;
529
530 ret = kstrtoul(buf, 0, &offset);
531 if (ret)
532 return ret;
533
534 if (offset % 4)
535 return -EINVAL;
536
537 to_target(item)->bar0_rw_offset = offset;
538
539 return count;
540 }
541
542 static ssize_t pcie_gadget_bar0_data_show(struct config_item *item, char *buf)
543 {
544 struct spear_pcie_gadget_config *config = to_target(item)
545 ulong data;
546
547 if (!config->va_bar0_address)
548 return -ENOMEM;
549
550 data = readl((ulong)config->va_bar0_address + config->bar0_rw_offset);
551
552 return sprintf(buf, "%lx", data);
553 }
554
555 static ssize_t pcie_gadget_bar0_data_store(struct config_item *item,
556 const char *buf, size_t count)
557 {
558 struct spear_pcie_gadget_config *config = to_target(item)
559 ulong data;
560 int ret;
561
562 ret = kstrtoul(buf, 0, &data);
563 if (ret)
564 return ret;
565
566 if (!config->va_bar0_address)
567 return -ENOMEM;
568
569 writel(data, (ulong)config->va_bar0_address + config->bar0_rw_offset);
570
571 return count;
572 }
573
574 CONFIGFS_ATTR(pcie_gadget_, link);
575 CONFIGFS_ATTR(pcie_gadget_, int_type);
576 CONFIGFS_ATTR(pcie_gadget_, no_of_msi);
577 CONFIGFS_ATTR_WO(pcie_gadget_, inta);
578 CONFIGFS_ATTR_WO(pcie_gadget_, send_msi);
579 CONFIGFS_ATTR(pcie_gadget_, vendor_id);
580 CONFIGFS_ATTR(pcie_gadget_, device_id);
581 CONFIGFS_ATTR(pcie_gadget_, bar0_size);
582 CONFIGFS_ATTR(pcie_gadget_, bar0_address);
583 CONFIGFS_ATTR(pcie_gadget_, bar0_rw_offset);
584 CONFIGFS_ATTR(pcie_gadget_, bar0_data);
585
586 static struct configfs_attribute *pcie_gadget_target_attrs[] = {
587 &pcie_gadget_attr_link,
588 &pcie_gadget_attr_int_type,
589 &pcie_gadget_attr_no_of_msi,
590 &pcie_gadget_attr_inta,
591 &pcie_gadget_attr_send_msi,
592 &pcie_gadget_attr_vendor_id,
593 &pcie_gadget_attr_device_id,
594 &pcie_gadget_attr_bar0_size,
595 &pcie_gadget_attr_bar0_address,
596 &pcie_gadget_attr_bar0_rw_offset,
597 &pcie_gadget_attr_bar0_data,
598 NULL,
599 };
600
601 static struct config_item_type pcie_gadget_target_type = {
602 .ct_attrs = pcie_gadget_target_attrs,
603 .ct_owner = THIS_MODULE,
604 };
605
606 static void spear13xx_pcie_device_init(struct spear_pcie_gadget_config *config)
607 {
608 struct pcie_app_reg __iomem *app_reg = config->va_app_base;
609
610 /*setup registers for outbound translation */
611
612 writel(config->base, &app_reg->in0_mem_addr_start);
613 writel(app_reg->in0_mem_addr_start + IN0_MEM_SIZE,
614 &app_reg->in0_mem_addr_limit);
615 writel(app_reg->in0_mem_addr_limit + 1, &app_reg->in1_mem_addr_start);
616 writel(app_reg->in1_mem_addr_start + IN1_MEM_SIZE,
617 &app_reg->in1_mem_addr_limit);
618 writel(app_reg->in1_mem_addr_limit + 1, &app_reg->in_io_addr_start);
619 writel(app_reg->in_io_addr_start + IN_IO_SIZE,
620 &app_reg->in_io_addr_limit);
621 writel(app_reg->in_io_addr_limit + 1, &app_reg->in_cfg0_addr_start);
622 writel(app_reg->in_cfg0_addr_start + IN_CFG0_SIZE,
623 &app_reg->in_cfg0_addr_limit);
624 writel(app_reg->in_cfg0_addr_limit + 1, &app_reg->in_cfg1_addr_start);
625 writel(app_reg->in_cfg1_addr_start + IN_CFG1_SIZE,
626 &app_reg->in_cfg1_addr_limit);
627 writel(app_reg->in_cfg1_addr_limit + 1, &app_reg->in_msg_addr_start);
628 writel(app_reg->in_msg_addr_start + IN_MSG_SIZE,
629 &app_reg->in_msg_addr_limit);
630
631 writel(app_reg->in0_mem_addr_start, &app_reg->pom0_mem_addr_start);
632 writel(app_reg->in1_mem_addr_start, &app_reg->pom1_mem_addr_start);
633 writel(app_reg->in_io_addr_start, &app_reg->pom_io_addr_start);
634
635 /*setup registers for inbound translation */
636
637 /* Keep AORAM mapped at BAR0 as default */
638 config->bar0_size = INBOUND_ADDR_MASK + 1;
639 spear_dbi_write_reg(config, PCIE_BAR0_MASK_REG, 4, INBOUND_ADDR_MASK);
640 spear_dbi_write_reg(config, PCI_BASE_ADDRESS_0, 4, 0xC);
641 config->va_bar0_address = ioremap(SPEAR13XX_SYSRAM1_BASE,
642 config->bar0_size);
643
644 writel(SPEAR13XX_SYSRAM1_BASE, &app_reg->pim0_mem_addr_start);
645 writel(0, &app_reg->pim1_mem_addr_start);
646 writel(INBOUND_ADDR_MASK + 1, &app_reg->mem0_addr_offset_limit);
647
648 writel(0x0, &app_reg->pim_io_addr_start);
649 writel(0x0, &app_reg->pim_io_addr_start);
650 writel(0x0, &app_reg->pim_rom_addr_start);
651
652 writel(DEVICE_TYPE_EP | (1 << MISCTRL_EN_ID)
653 | ((u32)1 << REG_TRANSLATION_ENABLE),
654 &app_reg->app_ctrl_0);
655 /* disable all rx interrupts */
656 writel(0, &app_reg->int_mask);
657
658 /* Select INTA as default*/
659 spear_dbi_write_reg(config, PCI_INTERRUPT_LINE, 1, 1);
660 }
661
662 static int spear_pcie_gadget_probe(struct platform_device *pdev)
663 {
664 struct resource *res0, *res1;
665 unsigned int status = 0;
666 int irq;
667 struct clk *clk;
668 static struct pcie_gadget_target *target;
669 struct spear_pcie_gadget_config *config;
670 struct config_item *cg_item;
671 struct configfs_subsystem *subsys;
672
673 target = devm_kzalloc(&pdev->dev, sizeof(*target), GFP_KERNEL);
674 if (!target) {
675 dev_err(&pdev->dev, "out of memory\n");
676 return -ENOMEM;
677 }
678
679 cg_item = &target->subsys.su_group.cg_item;
680 sprintf(cg_item->ci_namebuf, "pcie_gadget.%d", pdev->id);
681 cg_item->ci_type = &pcie_gadget_target_type;
682 config = &target->config;
683
684 /* get resource for application registers*/
685 res0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
686 config->va_app_base = devm_ioremap_resource(&pdev->dev, res0);
687 if (IS_ERR(config->va_app_base)) {
688 dev_err(&pdev->dev, "ioremap fail\n");
689 return PTR_ERR(config->va_app_base);
690 }
691
692 /* get resource for dbi registers*/
693 res1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
694 config->base = (void __iomem *)res1->start;
695
696 config->va_dbi_base = devm_ioremap_resource(&pdev->dev, res1);
697 if (IS_ERR(config->va_dbi_base)) {
698 dev_err(&pdev->dev, "ioremap fail\n");
699 return PTR_ERR(config->va_dbi_base);
700 }
701
702 platform_set_drvdata(pdev, target);
703
704 irq = platform_get_irq(pdev, 0);
705 if (irq < 0) {
706 dev_err(&pdev->dev, "no update irq?\n");
707 return irq;
708 }
709
710 status = devm_request_irq(&pdev->dev, irq, spear_pcie_gadget_irq,
711 0, pdev->name, NULL);
712 if (status) {
713 dev_err(&pdev->dev,
714 "pcie gadget interrupt IRQ%d already claimed\n", irq);
715 return status;
716 }
717
718 /* Register configfs hooks */
719 subsys = &target->subsys;
720 config_group_init(&subsys->su_group);
721 mutex_init(&subsys->su_mutex);
722 status = configfs_register_subsystem(subsys);
723 if (status)
724 return status;
725
726 /*
727 * init basic pcie application registers
728 * do not enable clock if it is PCIE0.Ideally , all controller should
729 * have been independent from others with respect to clock. But PCIE1
730 * and 2 depends on PCIE0.So PCIE0 clk is provided during board init.
731 */
732 if (pdev->id == 1) {
733 /*
734 * Ideally CFG Clock should have been also enabled here. But
735 * it is done currently during board init routne
736 */
737 clk = clk_get_sys("pcie1", NULL);
738 if (IS_ERR(clk)) {
739 pr_err("%s:couldn't get clk for pcie1\n", __func__);
740 return PTR_ERR(clk);
741 }
742 status = clk_enable(clk);
743 if (status) {
744 pr_err("%s:couldn't enable clk for pcie1\n", __func__);
745 return status;
746 }
747 } else if (pdev->id == 2) {
748 /*
749 * Ideally CFG Clock should have been also enabled here. But
750 * it is done currently during board init routne
751 */
752 clk = clk_get_sys("pcie2", NULL);
753 if (IS_ERR(clk)) {
754 pr_err("%s:couldn't get clk for pcie2\n", __func__);
755 return PTR_ERR(clk);
756 }
757 status = clk_enable(clk);
758 if (status) {
759 pr_err("%s:couldn't enable clk for pcie2\n", __func__);
760 return status;
761 }
762 }
763 spear13xx_pcie_device_init(config);
764
765 return 0;
766 }
767
768 static int spear_pcie_gadget_remove(struct platform_device *pdev)
769 {
770 static struct pcie_gadget_target *target;
771
772 target = platform_get_drvdata(pdev);
773
774 configfs_unregister_subsystem(&target->subsys);
775
776 return 0;
777 }
778
779 static void spear_pcie_gadget_shutdown(struct platform_device *pdev)
780 {
781 }
782
783 static struct platform_driver spear_pcie_gadget_driver = {
784 .probe = spear_pcie_gadget_probe,
785 .remove = spear_pcie_gadget_remove,
786 .shutdown = spear_pcie_gadget_shutdown,
787 .driver = {
788 .name = "pcie-gadget-spear",
789 .bus = &platform_bus_type
790 },
791 };
792
793 module_platform_driver(spear_pcie_gadget_driver);
794
795 MODULE_ALIAS("platform:pcie-gadget-spear");
796 MODULE_AUTHOR("Pratyush Anand");
797 MODULE_LICENSE("GPL");
Linux with added FPC-III support