1 /*
2 * drivers/misc/spear13xx_pcie_gadget.c
3 *
4 * Copyright (C) 2010 ST Microelectronics
5 * Pratyush Anand<pratyush.anand@st.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
enable_dbi_access(struct pcie_app_reg __iomem * app_reg)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
disable_dbi_access(struct pcie_app_reg __iomem * app_reg)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
spear_dbi_read_reg(struct spear_pcie_gadget_config * config,int where,int size,u32 * val)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
spear_dbi_write_reg(struct spear_pcie_gadget_config * config,int where,int size,u32 val)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
pci_find_own_next_cap_ttl(struct spear_pcie_gadget_config * config,u32 pos,int cap,int * ttl)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
pci_find_own_next_cap(struct spear_pcie_gadget_config * config,u32 pos,int cap)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
pci_find_own_cap_start(struct spear_pcie_gadget_config * config,u8 hdr_type)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 */
pci_find_own_capability(struct spear_pcie_gadget_config * config,int cap)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
spear_pcie_gadget_irq(int irq,void * dev_id)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 */
pcie_gadget_show_link(struct spear_pcie_gadget_config * config,char * buf)223 static ssize_t pcie_gadget_show_link(
224 struct spear_pcie_gadget_config *config,
225 char *buf)
226 {
227 struct pcie_app_reg __iomem *app_reg = config->va_app_base;
228
229 if (readl(&app_reg->app_status_1) & ((u32)1 << XMLH_LINK_UP_ID))
230 return sprintf(buf, "UP");
231 else
232 return sprintf(buf, "DOWN");
233 }
234
pcie_gadget_store_link(struct spear_pcie_gadget_config * config,const char * buf,size_t count)235 static ssize_t pcie_gadget_store_link(
236 struct spear_pcie_gadget_config *config,
237 const char *buf, size_t count)
238 {
239 struct pcie_app_reg __iomem *app_reg = config->va_app_base;
240
241 if (sysfs_streq(buf, "UP"))
242 writel(readl(&app_reg->app_ctrl_0) | (1 << APP_LTSSM_ENABLE_ID),
243 &app_reg->app_ctrl_0);
244 else if (sysfs_streq(buf, "DOWN"))
245 writel(readl(&app_reg->app_ctrl_0)
246 & ~(1 << APP_LTSSM_ENABLE_ID),
247 &app_reg->app_ctrl_0);
248 else
249 return -EINVAL;
250 return count;
251 }
252
pcie_gadget_show_int_type(struct spear_pcie_gadget_config * config,char * buf)253 static ssize_t pcie_gadget_show_int_type(
254 struct spear_pcie_gadget_config *config,
255 char *buf)
256 {
257 return sprintf(buf, "%s", config->int_type);
258 }
259
pcie_gadget_store_int_type(struct spear_pcie_gadget_config * config,const char * buf,size_t count)260 static ssize_t pcie_gadget_store_int_type(
261 struct spear_pcie_gadget_config *config,
262 const char *buf, size_t count)
263 {
264 u32 cap, vec, flags;
265 ulong vector;
266
267 if (sysfs_streq(buf, "INTA"))
268 spear_dbi_write_reg(config, PCI_INTERRUPT_LINE, 1, 1);
269
270 else if (sysfs_streq(buf, "MSI")) {
271 vector = config->requested_msi;
272 vec = 0;
273 while (vector > 1) {
274 vector /= 2;
275 vec++;
276 }
277 spear_dbi_write_reg(config, PCI_INTERRUPT_LINE, 1, 0);
278 cap = pci_find_own_capability(config, PCI_CAP_ID_MSI);
279 spear_dbi_read_reg(config, cap + PCI_MSI_FLAGS, 1, &flags);
280 flags &= ~PCI_MSI_FLAGS_QMASK;
281 flags |= vec << 1;
282 spear_dbi_write_reg(config, cap + PCI_MSI_FLAGS, 1, flags);
283 } else
284 return -EINVAL;
285
286 strcpy(config->int_type, buf);
287
288 return count;
289 }
290
pcie_gadget_show_no_of_msi(struct spear_pcie_gadget_config * config,char * buf)291 static ssize_t pcie_gadget_show_no_of_msi(
292 struct spear_pcie_gadget_config *config,
293 char *buf)
294 {
295 struct pcie_app_reg __iomem *app_reg = config->va_app_base;
296 u32 cap, vec, flags;
297 ulong vector;
298
299 if ((readl(&app_reg->msg_status) & (1 << CFG_MSI_EN_ID))
300 != (1 << CFG_MSI_EN_ID))
301 vector = 0;
302 else {
303 cap = pci_find_own_capability(config, PCI_CAP_ID_MSI);
304 spear_dbi_read_reg(config, cap + PCI_MSI_FLAGS, 1, &flags);
305 flags &= ~PCI_MSI_FLAGS_QSIZE;
306 vec = flags >> 4;
307 vector = 1;
308 while (vec--)
309 vector *= 2;
310 }
311 config->configured_msi = vector;
312
313 return sprintf(buf, "%lu", vector);
314 }
315
pcie_gadget_store_no_of_msi(struct spear_pcie_gadget_config * config,const char * buf,size_t count)316 static ssize_t pcie_gadget_store_no_of_msi(
317 struct spear_pcie_gadget_config *config,
318 const char *buf, size_t count)
319 {
320 int ret;
321
322 ret = kstrtoul(buf, 0, &config->requested_msi);
323 if (ret)
324 return ret;
325
326 if (config->requested_msi > 32)
327 config->requested_msi = 32;
328
329 return count;
330 }
331
pcie_gadget_store_inta(struct spear_pcie_gadget_config * config,const char * buf,size_t count)332 static ssize_t pcie_gadget_store_inta(
333 struct spear_pcie_gadget_config *config,
334 const char *buf, size_t count)
335 {
336 struct pcie_app_reg __iomem *app_reg = config->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
pcie_gadget_store_send_msi(struct spear_pcie_gadget_config * config,const char * buf,size_t count)354 static ssize_t pcie_gadget_store_send_msi(
355 struct spear_pcie_gadget_config *config,
356 const char *buf, size_t count)
357 {
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
pcie_gadget_show_vendor_id(struct spear_pcie_gadget_config * config,char * buf)391 static ssize_t pcie_gadget_show_vendor_id(
392 struct spear_pcie_gadget_config *config,
393 char *buf)
394 {
395 u32 id;
396
397 spear_dbi_read_reg(config, PCI_VENDOR_ID, 2, &id);
398
399 return sprintf(buf, "%x", id);
400 }
401
pcie_gadget_store_vendor_id(struct spear_pcie_gadget_config * config,const char * buf,size_t count)402 static ssize_t pcie_gadget_store_vendor_id(
403 struct spear_pcie_gadget_config *config,
404 const char *buf, size_t count)
405 {
406 ulong id;
407 int ret;
408
409 ret = kstrtoul(buf, 0, &id);
410 if (ret)
411 return ret;
412
413 spear_dbi_write_reg(config, PCI_VENDOR_ID, 2, id);
414
415 return count;
416 }
417
pcie_gadget_show_device_id(struct spear_pcie_gadget_config * config,char * buf)418 static ssize_t pcie_gadget_show_device_id(
419 struct spear_pcie_gadget_config *config,
420 char *buf)
421 {
422 u32 id;
423
424 spear_dbi_read_reg(config, PCI_DEVICE_ID, 2, &id);
425
426 return sprintf(buf, "%x", id);
427 }
428
pcie_gadget_store_device_id(struct spear_pcie_gadget_config * config,const char * buf,size_t count)429 static ssize_t pcie_gadget_store_device_id(
430 struct spear_pcie_gadget_config *config,
431 const char *buf, size_t count)
432 {
433 ulong id;
434 int ret;
435
436 ret = kstrtoul(buf, 0, &id);
437 if (ret)
438 return ret;
439
440 spear_dbi_write_reg(config, PCI_DEVICE_ID, 2, id);
441
442 return count;
443 }
444
pcie_gadget_show_bar0_size(struct spear_pcie_gadget_config * config,char * buf)445 static ssize_t pcie_gadget_show_bar0_size(
446 struct spear_pcie_gadget_config *config,
447 char *buf)
448 {
449 return sprintf(buf, "%lx", config->bar0_size);
450 }
451
pcie_gadget_store_bar0_size(struct spear_pcie_gadget_config * config,const char * buf,size_t count)452 static ssize_t pcie_gadget_store_bar0_size(
453 struct spear_pcie_gadget_config *config,
454 const char *buf, size_t count)
455 {
456 ulong size;
457 u32 pos, pos1;
458 u32 no_of_bit = 0;
459 int ret;
460
461 ret = kstrtoul(buf, 0, &size);
462 if (ret)
463 return ret;
464
465 /* min bar size is 256 */
466 if (size <= 0x100)
467 size = 0x100;
468 /* max bar size is 1MB*/
469 else if (size >= 0x100000)
470 size = 0x100000;
471 else {
472 pos = 0;
473 pos1 = 0;
474 while (pos < 21) {
475 pos = find_next_bit((ulong *)&size, 21, pos);
476 if (pos != 21)
477 pos1 = pos + 1;
478 pos++;
479 no_of_bit++;
480 }
481 if (no_of_bit == 2)
482 pos1--;
483
484 size = 1 << pos1;
485 }
486 config->bar0_size = size;
487 spear_dbi_write_reg(config, PCIE_BAR0_MASK_REG, 4, size - 1);
488
489 return count;
490 }
491
pcie_gadget_show_bar0_address(struct spear_pcie_gadget_config * config,char * buf)492 static ssize_t pcie_gadget_show_bar0_address(
493 struct spear_pcie_gadget_config *config,
494 char *buf)
495 {
496 struct pcie_app_reg __iomem *app_reg = config->va_app_base;
497
498 u32 address = readl(&app_reg->pim0_mem_addr_start);
499
500 return sprintf(buf, "%x", address);
501 }
502
pcie_gadget_store_bar0_address(struct spear_pcie_gadget_config * config,const char * buf,size_t count)503 static ssize_t pcie_gadget_store_bar0_address(
504 struct spear_pcie_gadget_config *config,
505 const char *buf, size_t count)
506 {
507 struct pcie_app_reg __iomem *app_reg = config->va_app_base;
508 ulong address;
509 int ret;
510
511 ret = kstrtoul(buf, 0, &address);
512 if (ret)
513 return ret;
514
515 address &= ~(config->bar0_size - 1);
516 if (config->va_bar0_address)
517 iounmap(config->va_bar0_address);
518 config->va_bar0_address = ioremap(address, config->bar0_size);
519 if (!config->va_bar0_address)
520 return -ENOMEM;
521
522 writel(address, &app_reg->pim0_mem_addr_start);
523
524 return count;
525 }
526
pcie_gadget_show_bar0_rw_offset(struct spear_pcie_gadget_config * config,char * buf)527 static ssize_t pcie_gadget_show_bar0_rw_offset(
528 struct spear_pcie_gadget_config *config,
529 char *buf)
530 {
531 return sprintf(buf, "%lx", config->bar0_rw_offset);
532 }
533
pcie_gadget_store_bar0_rw_offset(struct spear_pcie_gadget_config * config,const char * buf,size_t count)534 static ssize_t pcie_gadget_store_bar0_rw_offset(
535 struct spear_pcie_gadget_config *config,
536 const char *buf, size_t count)
537 {
538 ulong offset;
539 int ret;
540
541 ret = kstrtoul(buf, 0, &offset);
542 if (ret)
543 return ret;
544
545 if (offset % 4)
546 return -EINVAL;
547
548 config->bar0_rw_offset = offset;
549
550 return count;
551 }
552
pcie_gadget_show_bar0_data(struct spear_pcie_gadget_config * config,char * buf)553 static ssize_t pcie_gadget_show_bar0_data(
554 struct spear_pcie_gadget_config *config,
555 char *buf)
556 {
557 ulong data;
558
559 if (!config->va_bar0_address)
560 return -ENOMEM;
561
562 data = readl((ulong)config->va_bar0_address + config->bar0_rw_offset);
563
564 return sprintf(buf, "%lx", data);
565 }
566
pcie_gadget_store_bar0_data(struct spear_pcie_gadget_config * config,const char * buf,size_t count)567 static ssize_t pcie_gadget_store_bar0_data(
568 struct spear_pcie_gadget_config *config,
569 const char *buf, size_t count)
570 {
571 ulong data;
572 int ret;
573
574 ret = kstrtoul(buf, 0, &data);
575 if (ret)
576 return ret;
577
578 if (!config->va_bar0_address)
579 return -ENOMEM;
580
581 writel(data, (ulong)config->va_bar0_address + config->bar0_rw_offset);
582
583 return count;
584 }
585
586 /*
587 * Attribute definitions.
588 */
589
590 #define PCIE_GADGET_TARGET_ATTR_RO(_name) \
591 static struct pcie_gadget_target_attr pcie_gadget_target_##_name = \
592 __CONFIGFS_ATTR(_name, S_IRUGO, pcie_gadget_show_##_name, NULL)
593
594 #define PCIE_GADGET_TARGET_ATTR_WO(_name) \
595 static struct pcie_gadget_target_attr pcie_gadget_target_##_name = \
596 __CONFIGFS_ATTR(_name, S_IWUSR, NULL, pcie_gadget_store_##_name)
597
598 #define PCIE_GADGET_TARGET_ATTR_RW(_name) \
599 static struct pcie_gadget_target_attr pcie_gadget_target_##_name = \
600 __CONFIGFS_ATTR(_name, S_IRUGO | S_IWUSR, pcie_gadget_show_##_name, \
601 pcie_gadget_store_##_name)
602 PCIE_GADGET_TARGET_ATTR_RW(link);
603 PCIE_GADGET_TARGET_ATTR_RW(int_type);
604 PCIE_GADGET_TARGET_ATTR_RW(no_of_msi);
605 PCIE_GADGET_TARGET_ATTR_WO(inta);
606 PCIE_GADGET_TARGET_ATTR_WO(send_msi);
607 PCIE_GADGET_TARGET_ATTR_RW(vendor_id);
608 PCIE_GADGET_TARGET_ATTR_RW(device_id);
609 PCIE_GADGET_TARGET_ATTR_RW(bar0_size);
610 PCIE_GADGET_TARGET_ATTR_RW(bar0_address);
611 PCIE_GADGET_TARGET_ATTR_RW(bar0_rw_offset);
612 PCIE_GADGET_TARGET_ATTR_RW(bar0_data);
613
614 static struct configfs_attribute *pcie_gadget_target_attrs[] = {
615 &pcie_gadget_target_link.attr,
616 &pcie_gadget_target_int_type.attr,
617 &pcie_gadget_target_no_of_msi.attr,
618 &pcie_gadget_target_inta.attr,
619 &pcie_gadget_target_send_msi.attr,
620 &pcie_gadget_target_vendor_id.attr,
621 &pcie_gadget_target_device_id.attr,
622 &pcie_gadget_target_bar0_size.attr,
623 &pcie_gadget_target_bar0_address.attr,
624 &pcie_gadget_target_bar0_rw_offset.attr,
625 &pcie_gadget_target_bar0_data.attr,
626 NULL,
627 };
628
to_target(struct config_item * item)629 static struct pcie_gadget_target *to_target(struct config_item *item)
630 {
631 return item ?
632 container_of(to_configfs_subsystem(to_config_group(item)),
633 struct pcie_gadget_target, subsys) : NULL;
634 }
635
636 /*
637 * Item operations and type for pcie_gadget_target.
638 */
639
pcie_gadget_target_attr_show(struct config_item * item,struct configfs_attribute * attr,char * buf)640 static ssize_t pcie_gadget_target_attr_show(struct config_item *item,
641 struct configfs_attribute *attr,
642 char *buf)
643 {
644 ssize_t ret = -EINVAL;
645 struct pcie_gadget_target *target = to_target(item);
646 struct pcie_gadget_target_attr *t_attr =
647 container_of(attr, struct pcie_gadget_target_attr, attr);
648
649 if (t_attr->show)
650 ret = t_attr->show(&target->config, buf);
651 return ret;
652 }
653
pcie_gadget_target_attr_store(struct config_item * item,struct configfs_attribute * attr,const char * buf,size_t count)654 static ssize_t pcie_gadget_target_attr_store(struct config_item *item,
655 struct configfs_attribute *attr,
656 const char *buf,
657 size_t count)
658 {
659 ssize_t ret = -EINVAL;
660 struct pcie_gadget_target *target = to_target(item);
661 struct pcie_gadget_target_attr *t_attr =
662 container_of(attr, struct pcie_gadget_target_attr, attr);
663
664 if (t_attr->store)
665 ret = t_attr->store(&target->config, buf, count);
666 return ret;
667 }
668
669 static struct configfs_item_operations pcie_gadget_target_item_ops = {
670 .show_attribute = pcie_gadget_target_attr_show,
671 .store_attribute = pcie_gadget_target_attr_store,
672 };
673
674 static struct config_item_type pcie_gadget_target_type = {
675 .ct_attrs = pcie_gadget_target_attrs,
676 .ct_item_ops = &pcie_gadget_target_item_ops,
677 .ct_owner = THIS_MODULE,
678 };
679
spear13xx_pcie_device_init(struct spear_pcie_gadget_config * config)680 static void spear13xx_pcie_device_init(struct spear_pcie_gadget_config *config)
681 {
682 struct pcie_app_reg __iomem *app_reg = config->va_app_base;
683
684 /*setup registers for outbound translation */
685
686 writel(config->base, &app_reg->in0_mem_addr_start);
687 writel(app_reg->in0_mem_addr_start + IN0_MEM_SIZE,
688 &app_reg->in0_mem_addr_limit);
689 writel(app_reg->in0_mem_addr_limit + 1, &app_reg->in1_mem_addr_start);
690 writel(app_reg->in1_mem_addr_start + IN1_MEM_SIZE,
691 &app_reg->in1_mem_addr_limit);
692 writel(app_reg->in1_mem_addr_limit + 1, &app_reg->in_io_addr_start);
693 writel(app_reg->in_io_addr_start + IN_IO_SIZE,
694 &app_reg->in_io_addr_limit);
695 writel(app_reg->in_io_addr_limit + 1, &app_reg->in_cfg0_addr_start);
696 writel(app_reg->in_cfg0_addr_start + IN_CFG0_SIZE,
697 &app_reg->in_cfg0_addr_limit);
698 writel(app_reg->in_cfg0_addr_limit + 1, &app_reg->in_cfg1_addr_start);
699 writel(app_reg->in_cfg1_addr_start + IN_CFG1_SIZE,
700 &app_reg->in_cfg1_addr_limit);
701 writel(app_reg->in_cfg1_addr_limit + 1, &app_reg->in_msg_addr_start);
702 writel(app_reg->in_msg_addr_start + IN_MSG_SIZE,
703 &app_reg->in_msg_addr_limit);
704
705 writel(app_reg->in0_mem_addr_start, &app_reg->pom0_mem_addr_start);
706 writel(app_reg->in1_mem_addr_start, &app_reg->pom1_mem_addr_start);
707 writel(app_reg->in_io_addr_start, &app_reg->pom_io_addr_start);
708
709 /*setup registers for inbound translation */
710
711 /* Keep AORAM mapped at BAR0 as default */
712 config->bar0_size = INBOUND_ADDR_MASK + 1;
713 spear_dbi_write_reg(config, PCIE_BAR0_MASK_REG, 4, INBOUND_ADDR_MASK);
714 spear_dbi_write_reg(config, PCI_BASE_ADDRESS_0, 4, 0xC);
715 config->va_bar0_address = ioremap(SPEAR13XX_SYSRAM1_BASE,
716 config->bar0_size);
717
718 writel(SPEAR13XX_SYSRAM1_BASE, &app_reg->pim0_mem_addr_start);
719 writel(0, &app_reg->pim1_mem_addr_start);
720 writel(INBOUND_ADDR_MASK + 1, &app_reg->mem0_addr_offset_limit);
721
722 writel(0x0, &app_reg->pim_io_addr_start);
723 writel(0x0, &app_reg->pim_io_addr_start);
724 writel(0x0, &app_reg->pim_rom_addr_start);
725
726 writel(DEVICE_TYPE_EP | (1 << MISCTRL_EN_ID)
727 | ((u32)1 << REG_TRANSLATION_ENABLE),
728 &app_reg->app_ctrl_0);
729 /* disable all rx interrupts */
730 writel(0, &app_reg->int_mask);
731
732 /* Select INTA as default*/
733 spear_dbi_write_reg(config, PCI_INTERRUPT_LINE, 1, 1);
734 }
735
spear_pcie_gadget_probe(struct platform_device * pdev)736 static int spear_pcie_gadget_probe(struct platform_device *pdev)
737 {
738 struct resource *res0, *res1;
739 unsigned int status = 0;
740 int irq;
741 struct clk *clk;
742 static struct pcie_gadget_target *target;
743 struct spear_pcie_gadget_config *config;
744 struct config_item *cg_item;
745 struct configfs_subsystem *subsys;
746
747 target = devm_kzalloc(&pdev->dev, sizeof(*target), GFP_KERNEL);
748 if (!target) {
749 dev_err(&pdev->dev, "out of memory\n");
750 return -ENOMEM;
751 }
752
753 cg_item = &target->subsys.su_group.cg_item;
754 sprintf(cg_item->ci_namebuf, "pcie_gadget.%d", pdev->id);
755 cg_item->ci_type = &pcie_gadget_target_type;
756 config = &target->config;
757
758 /* get resource for application registers*/
759 res0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
760 config->va_app_base = devm_ioremap_resource(&pdev->dev, res0);
761 if (IS_ERR(config->va_app_base)) {
762 dev_err(&pdev->dev, "ioremap fail\n");
763 return PTR_ERR(config->va_app_base);
764 }
765
766 /* get resource for dbi registers*/
767 res1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
768 config->base = (void __iomem *)res1->start;
769
770 config->va_dbi_base = devm_ioremap_resource(&pdev->dev, res1);
771 if (IS_ERR(config->va_dbi_base)) {
772 dev_err(&pdev->dev, "ioremap fail\n");
773 return PTR_ERR(config->va_dbi_base);
774 }
775
776 platform_set_drvdata(pdev, target);
777
778 irq = platform_get_irq(pdev, 0);
779 if (irq < 0) {
780 dev_err(&pdev->dev, "no update irq?\n");
781 return irq;
782 }
783
784 status = devm_request_irq(&pdev->dev, irq, spear_pcie_gadget_irq,
785 0, pdev->name, NULL);
786 if (status) {
787 dev_err(&pdev->dev,
788 "pcie gadget interrupt IRQ%d already claimed\n", irq);
789 return status;
790 }
791
792 /* Register configfs hooks */
793 subsys = &target->subsys;
794 config_group_init(&subsys->su_group);
795 mutex_init(&subsys->su_mutex);
796 status = configfs_register_subsystem(subsys);
797 if (status)
798 return status;
799
800 /*
801 * init basic pcie application registers
802 * do not enable clock if it is PCIE0.Ideally , all controller should
803 * have been independent from others with respect to clock. But PCIE1
804 * and 2 depends on PCIE0.So PCIE0 clk is provided during board init.
805 */
806 if (pdev->id == 1) {
807 /*
808 * Ideally CFG Clock should have been also enabled here. But
809 * it is done currently during board init routne
810 */
811 clk = clk_get_sys("pcie1", NULL);
812 if (IS_ERR(clk)) {
813 pr_err("%s:couldn't get clk for pcie1\n", __func__);
814 return PTR_ERR(clk);
815 }
816 status = clk_enable(clk);
817 if (status) {
818 pr_err("%s:couldn't enable clk for pcie1\n", __func__);
819 return status;
820 }
821 } else if (pdev->id == 2) {
822 /*
823 * Ideally CFG Clock should have been also enabled here. But
824 * it is done currently during board init routne
825 */
826 clk = clk_get_sys("pcie2", NULL);
827 if (IS_ERR(clk)) {
828 pr_err("%s:couldn't get clk for pcie2\n", __func__);
829 return PTR_ERR(clk);
830 }
831 status = clk_enable(clk);
832 if (status) {
833 pr_err("%s:couldn't enable clk for pcie2\n", __func__);
834 return status;
835 }
836 }
837 spear13xx_pcie_device_init(config);
838
839 return 0;
840 }
841
spear_pcie_gadget_remove(struct platform_device * pdev)842 static int spear_pcie_gadget_remove(struct platform_device *pdev)
843 {
844 static struct pcie_gadget_target *target;
845
846 target = platform_get_drvdata(pdev);
847
848 configfs_unregister_subsystem(&target->subsys);
849
850 return 0;
851 }
852
spear_pcie_gadget_shutdown(struct platform_device * pdev)853 static void spear_pcie_gadget_shutdown(struct platform_device *pdev)
854 {
855 }
856
857 static struct platform_driver spear_pcie_gadget_driver = {
858 .probe = spear_pcie_gadget_probe,
859 .remove = spear_pcie_gadget_remove,
860 .shutdown = spear_pcie_gadget_shutdown,
861 .driver = {
862 .name = "pcie-gadget-spear",
863 .bus = &platform_bus_type
864 },
865 };
866
867 module_platform_driver(spear_pcie_gadget_driver);
868
869 MODULE_ALIAS("platform:pcie-gadget-spear");
870 MODULE_AUTHOR("Pratyush Anand");
871 MODULE_LICENSE("GPL");
872