1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Synopsys DesignWare PCIe host controller driver
4 *
5 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
6 * https://www.samsung.com
7 *
8 * Author: Jingoo Han <jg1.han@samsung.com>
9 */
10
11 #include <linux/align.h>
12 #include <linux/bitops.h>
13 #include <linux/clk.h>
14 #include <linux/delay.h>
15 #include <linux/dma/edma.h>
16 #include <linux/gpio/consumer.h>
17 #include <linux/ioport.h>
18 #include <linux/of.h>
19 #include <linux/platform_device.h>
20 #include <linux/sizes.h>
21 #include <linux/types.h>
22
23 #include "../../pci.h"
24 #include "pcie-designware.h"
25
26 static const char * const dw_pcie_app_clks[DW_PCIE_NUM_APP_CLKS] = {
27 [DW_PCIE_DBI_CLK] = "dbi",
28 [DW_PCIE_MSTR_CLK] = "mstr",
29 [DW_PCIE_SLV_CLK] = "slv",
30 };
31
32 static const char * const dw_pcie_core_clks[DW_PCIE_NUM_CORE_CLKS] = {
33 [DW_PCIE_PIPE_CLK] = "pipe",
34 [DW_PCIE_CORE_CLK] = "core",
35 [DW_PCIE_AUX_CLK] = "aux",
36 [DW_PCIE_REF_CLK] = "ref",
37 };
38
39 static const char * const dw_pcie_app_rsts[DW_PCIE_NUM_APP_RSTS] = {
40 [DW_PCIE_DBI_RST] = "dbi",
41 [DW_PCIE_MSTR_RST] = "mstr",
42 [DW_PCIE_SLV_RST] = "slv",
43 };
44
45 static const char * const dw_pcie_core_rsts[DW_PCIE_NUM_CORE_RSTS] = {
46 [DW_PCIE_NON_STICKY_RST] = "non-sticky",
47 [DW_PCIE_STICKY_RST] = "sticky",
48 [DW_PCIE_CORE_RST] = "core",
49 [DW_PCIE_PIPE_RST] = "pipe",
50 [DW_PCIE_PHY_RST] = "phy",
51 [DW_PCIE_HOT_RST] = "hot",
52 [DW_PCIE_PWR_RST] = "pwr",
53 };
54
dw_pcie_get_clocks(struct dw_pcie * pci)55 static int dw_pcie_get_clocks(struct dw_pcie *pci)
56 {
57 int i, ret;
58
59 for (i = 0; i < DW_PCIE_NUM_APP_CLKS; i++)
60 pci->app_clks[i].id = dw_pcie_app_clks[i];
61
62 for (i = 0; i < DW_PCIE_NUM_CORE_CLKS; i++)
63 pci->core_clks[i].id = dw_pcie_core_clks[i];
64
65 ret = devm_clk_bulk_get_optional(pci->dev, DW_PCIE_NUM_APP_CLKS,
66 pci->app_clks);
67 if (ret)
68 return ret;
69
70 return devm_clk_bulk_get_optional(pci->dev, DW_PCIE_NUM_CORE_CLKS,
71 pci->core_clks);
72 }
73
dw_pcie_get_resets(struct dw_pcie * pci)74 static int dw_pcie_get_resets(struct dw_pcie *pci)
75 {
76 int i, ret;
77
78 for (i = 0; i < DW_PCIE_NUM_APP_RSTS; i++)
79 pci->app_rsts[i].id = dw_pcie_app_rsts[i];
80
81 for (i = 0; i < DW_PCIE_NUM_CORE_RSTS; i++)
82 pci->core_rsts[i].id = dw_pcie_core_rsts[i];
83
84 ret = devm_reset_control_bulk_get_optional_shared(pci->dev,
85 DW_PCIE_NUM_APP_RSTS,
86 pci->app_rsts);
87 if (ret)
88 return ret;
89
90 ret = devm_reset_control_bulk_get_optional_exclusive(pci->dev,
91 DW_PCIE_NUM_CORE_RSTS,
92 pci->core_rsts);
93 if (ret)
94 return ret;
95
96 pci->pe_rst = devm_gpiod_get_optional(pci->dev, "reset", GPIOD_OUT_HIGH);
97 if (IS_ERR(pci->pe_rst))
98 return PTR_ERR(pci->pe_rst);
99
100 return 0;
101 }
102
dw_pcie_get_resources(struct dw_pcie * pci)103 int dw_pcie_get_resources(struct dw_pcie *pci)
104 {
105 struct platform_device *pdev = to_platform_device(pci->dev);
106 struct device_node *np = dev_of_node(pci->dev);
107 struct resource *res;
108 int ret;
109
110 if (!pci->dbi_base) {
111 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
112 pci->dbi_base = devm_pci_remap_cfg_resource(pci->dev, res);
113 if (IS_ERR(pci->dbi_base))
114 return PTR_ERR(pci->dbi_base);
115 }
116
117 /* DBI2 is mainly useful for the endpoint controller */
118 if (!pci->dbi_base2) {
119 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi2");
120 if (res) {
121 pci->dbi_base2 = devm_pci_remap_cfg_resource(pci->dev, res);
122 if (IS_ERR(pci->dbi_base2))
123 return PTR_ERR(pci->dbi_base2);
124 } else {
125 pci->dbi_base2 = pci->dbi_base + SZ_4K;
126 }
127 }
128
129 /* For non-unrolled iATU/eDMA platforms this range will be ignored */
130 if (!pci->atu_base) {
131 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "atu");
132 if (res) {
133 pci->atu_size = resource_size(res);
134 pci->atu_base = devm_ioremap_resource(pci->dev, res);
135 if (IS_ERR(pci->atu_base))
136 return PTR_ERR(pci->atu_base);
137 } else {
138 pci->atu_base = pci->dbi_base + DEFAULT_DBI_ATU_OFFSET;
139 }
140 }
141
142 /* Set a default value suitable for at most 8 in and 8 out windows */
143 if (!pci->atu_size)
144 pci->atu_size = SZ_4K;
145
146 /* eDMA region can be mapped to a custom base address */
147 if (!pci->edma.reg_base) {
148 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma");
149 if (res) {
150 pci->edma.reg_base = devm_ioremap_resource(pci->dev, res);
151 if (IS_ERR(pci->edma.reg_base))
152 return PTR_ERR(pci->edma.reg_base);
153 } else if (pci->atu_size >= 2 * DEFAULT_DBI_DMA_OFFSET) {
154 pci->edma.reg_base = pci->atu_base + DEFAULT_DBI_DMA_OFFSET;
155 }
156 }
157
158 /* LLDD is supposed to manually switch the clocks and resets state */
159 if (dw_pcie_cap_is(pci, REQ_RES)) {
160 ret = dw_pcie_get_clocks(pci);
161 if (ret)
162 return ret;
163
164 ret = dw_pcie_get_resets(pci);
165 if (ret)
166 return ret;
167 }
168
169 if (pci->link_gen < 1)
170 pci->link_gen = of_pci_get_max_link_speed(np);
171
172 of_property_read_u32(np, "num-lanes", &pci->num_lanes);
173
174 if (of_property_read_bool(np, "snps,enable-cdm-check"))
175 dw_pcie_cap_set(pci, CDM_CHECK);
176
177 return 0;
178 }
179
dw_pcie_version_detect(struct dw_pcie * pci)180 void dw_pcie_version_detect(struct dw_pcie *pci)
181 {
182 u32 ver;
183
184 /* The content of the CSR is zero on DWC PCIe older than v4.70a */
185 ver = dw_pcie_readl_dbi(pci, PCIE_VERSION_NUMBER);
186 if (!ver)
187 return;
188
189 if (pci->version && pci->version != ver)
190 dev_warn(pci->dev, "Versions don't match (%08x != %08x)\n",
191 pci->version, ver);
192 else
193 pci->version = ver;
194
195 ver = dw_pcie_readl_dbi(pci, PCIE_VERSION_TYPE);
196
197 if (pci->type && pci->type != ver)
198 dev_warn(pci->dev, "Types don't match (%08x != %08x)\n",
199 pci->type, ver);
200 else
201 pci->type = ver;
202 }
203
204 /*
205 * These interfaces resemble the pci_find_*capability() interfaces, but these
206 * are for configuring host controllers, which are bridges *to* PCI devices but
207 * are not PCI devices themselves.
208 */
__dw_pcie_find_next_cap(struct dw_pcie * pci,u8 cap_ptr,u8 cap)209 static u8 __dw_pcie_find_next_cap(struct dw_pcie *pci, u8 cap_ptr,
210 u8 cap)
211 {
212 u8 cap_id, next_cap_ptr;
213 u16 reg;
214
215 if (!cap_ptr)
216 return 0;
217
218 reg = dw_pcie_readw_dbi(pci, cap_ptr);
219 cap_id = (reg & 0x00ff);
220
221 if (cap_id > PCI_CAP_ID_MAX)
222 return 0;
223
224 if (cap_id == cap)
225 return cap_ptr;
226
227 next_cap_ptr = (reg & 0xff00) >> 8;
228 return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap);
229 }
230
dw_pcie_find_capability(struct dw_pcie * pci,u8 cap)231 u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap)
232 {
233 u8 next_cap_ptr;
234 u16 reg;
235
236 reg = dw_pcie_readw_dbi(pci, PCI_CAPABILITY_LIST);
237 next_cap_ptr = (reg & 0x00ff);
238
239 return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap);
240 }
241 EXPORT_SYMBOL_GPL(dw_pcie_find_capability);
242
dw_pcie_find_next_ext_capability(struct dw_pcie * pci,u16 start,u8 cap)243 static u16 dw_pcie_find_next_ext_capability(struct dw_pcie *pci, u16 start,
244 u8 cap)
245 {
246 u32 header;
247 int ttl;
248 int pos = PCI_CFG_SPACE_SIZE;
249
250 /* minimum 8 bytes per capability */
251 ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8;
252
253 if (start)
254 pos = start;
255
256 header = dw_pcie_readl_dbi(pci, pos);
257 /*
258 * If we have no capabilities, this is indicated by cap ID,
259 * cap version and next pointer all being 0.
260 */
261 if (header == 0)
262 return 0;
263
264 while (ttl-- > 0) {
265 if (PCI_EXT_CAP_ID(header) == cap && pos != start)
266 return pos;
267
268 pos = PCI_EXT_CAP_NEXT(header);
269 if (pos < PCI_CFG_SPACE_SIZE)
270 break;
271
272 header = dw_pcie_readl_dbi(pci, pos);
273 }
274
275 return 0;
276 }
277
dw_pcie_find_ext_capability(struct dw_pcie * pci,u8 cap)278 u16 dw_pcie_find_ext_capability(struct dw_pcie *pci, u8 cap)
279 {
280 return dw_pcie_find_next_ext_capability(pci, 0, cap);
281 }
282 EXPORT_SYMBOL_GPL(dw_pcie_find_ext_capability);
283
dw_pcie_read(void __iomem * addr,int size,u32 * val)284 int dw_pcie_read(void __iomem *addr, int size, u32 *val)
285 {
286 if (!IS_ALIGNED((uintptr_t)addr, size)) {
287 *val = 0;
288 return PCIBIOS_BAD_REGISTER_NUMBER;
289 }
290
291 if (size == 4) {
292 *val = readl(addr);
293 } else if (size == 2) {
294 *val = readw(addr);
295 } else if (size == 1) {
296 *val = readb(addr);
297 } else {
298 *val = 0;
299 return PCIBIOS_BAD_REGISTER_NUMBER;
300 }
301
302 return PCIBIOS_SUCCESSFUL;
303 }
304 EXPORT_SYMBOL_GPL(dw_pcie_read);
305
dw_pcie_write(void __iomem * addr,int size,u32 val)306 int dw_pcie_write(void __iomem *addr, int size, u32 val)
307 {
308 if (!IS_ALIGNED((uintptr_t)addr, size))
309 return PCIBIOS_BAD_REGISTER_NUMBER;
310
311 if (size == 4)
312 writel(val, addr);
313 else if (size == 2)
314 writew(val, addr);
315 else if (size == 1)
316 writeb(val, addr);
317 else
318 return PCIBIOS_BAD_REGISTER_NUMBER;
319
320 return PCIBIOS_SUCCESSFUL;
321 }
322 EXPORT_SYMBOL_GPL(dw_pcie_write);
323
dw_pcie_read_dbi(struct dw_pcie * pci,u32 reg,size_t size)324 u32 dw_pcie_read_dbi(struct dw_pcie *pci, u32 reg, size_t size)
325 {
326 int ret;
327 u32 val;
328
329 if (pci->ops && pci->ops->read_dbi)
330 return pci->ops->read_dbi(pci, pci->dbi_base, reg, size);
331
332 ret = dw_pcie_read(pci->dbi_base + reg, size, &val);
333 if (ret)
334 dev_err(pci->dev, "Read DBI address failed\n");
335
336 return val;
337 }
338 EXPORT_SYMBOL_GPL(dw_pcie_read_dbi);
339
dw_pcie_write_dbi(struct dw_pcie * pci,u32 reg,size_t size,u32 val)340 void dw_pcie_write_dbi(struct dw_pcie *pci, u32 reg, size_t size, u32 val)
341 {
342 int ret;
343
344 if (pci->ops && pci->ops->write_dbi) {
345 pci->ops->write_dbi(pci, pci->dbi_base, reg, size, val);
346 return;
347 }
348
349 ret = dw_pcie_write(pci->dbi_base + reg, size, val);
350 if (ret)
351 dev_err(pci->dev, "Write DBI address failed\n");
352 }
353 EXPORT_SYMBOL_GPL(dw_pcie_write_dbi);
354
dw_pcie_write_dbi2(struct dw_pcie * pci,u32 reg,size_t size,u32 val)355 void dw_pcie_write_dbi2(struct dw_pcie *pci, u32 reg, size_t size, u32 val)
356 {
357 int ret;
358
359 if (pci->ops && pci->ops->write_dbi2) {
360 pci->ops->write_dbi2(pci, pci->dbi_base2, reg, size, val);
361 return;
362 }
363
364 ret = dw_pcie_write(pci->dbi_base2 + reg, size, val);
365 if (ret)
366 dev_err(pci->dev, "write DBI address failed\n");
367 }
368 EXPORT_SYMBOL_GPL(dw_pcie_write_dbi2);
369
dw_pcie_select_atu(struct dw_pcie * pci,u32 dir,u32 index)370 static inline void __iomem *dw_pcie_select_atu(struct dw_pcie *pci, u32 dir,
371 u32 index)
372 {
373 if (dw_pcie_cap_is(pci, IATU_UNROLL))
374 return pci->atu_base + PCIE_ATU_UNROLL_BASE(dir, index);
375
376 dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, dir | index);
377 return pci->atu_base;
378 }
379
dw_pcie_readl_atu(struct dw_pcie * pci,u32 dir,u32 index,u32 reg)380 static u32 dw_pcie_readl_atu(struct dw_pcie *pci, u32 dir, u32 index, u32 reg)
381 {
382 void __iomem *base;
383 int ret;
384 u32 val;
385
386 base = dw_pcie_select_atu(pci, dir, index);
387
388 if (pci->ops && pci->ops->read_dbi)
389 return pci->ops->read_dbi(pci, base, reg, 4);
390
391 ret = dw_pcie_read(base + reg, 4, &val);
392 if (ret)
393 dev_err(pci->dev, "Read ATU address failed\n");
394
395 return val;
396 }
397
dw_pcie_writel_atu(struct dw_pcie * pci,u32 dir,u32 index,u32 reg,u32 val)398 static void dw_pcie_writel_atu(struct dw_pcie *pci, u32 dir, u32 index,
399 u32 reg, u32 val)
400 {
401 void __iomem *base;
402 int ret;
403
404 base = dw_pcie_select_atu(pci, dir, index);
405
406 if (pci->ops && pci->ops->write_dbi) {
407 pci->ops->write_dbi(pci, base, reg, 4, val);
408 return;
409 }
410
411 ret = dw_pcie_write(base + reg, 4, val);
412 if (ret)
413 dev_err(pci->dev, "Write ATU address failed\n");
414 }
415
dw_pcie_readl_atu_ob(struct dw_pcie * pci,u32 index,u32 reg)416 static inline u32 dw_pcie_readl_atu_ob(struct dw_pcie *pci, u32 index, u32 reg)
417 {
418 return dw_pcie_readl_atu(pci, PCIE_ATU_REGION_DIR_OB, index, reg);
419 }
420
dw_pcie_writel_atu_ob(struct dw_pcie * pci,u32 index,u32 reg,u32 val)421 static inline void dw_pcie_writel_atu_ob(struct dw_pcie *pci, u32 index, u32 reg,
422 u32 val)
423 {
424 dw_pcie_writel_atu(pci, PCIE_ATU_REGION_DIR_OB, index, reg, val);
425 }
426
dw_pcie_enable_ecrc(u32 val)427 static inline u32 dw_pcie_enable_ecrc(u32 val)
428 {
429 /*
430 * DesignWare core version 4.90A has a design issue where the 'TD'
431 * bit in the Control register-1 of the ATU outbound region acts
432 * like an override for the ECRC setting, i.e., the presence of TLP
433 * Digest (ECRC) in the outgoing TLPs is solely determined by this
434 * bit. This is contrary to the PCIe spec which says that the
435 * enablement of the ECRC is solely determined by the AER
436 * registers.
437 *
438 * Because of this, even when the ECRC is enabled through AER
439 * registers, the transactions going through ATU won't have TLP
440 * Digest as there is no way the PCI core AER code could program
441 * the TD bit which is specific to the DesignWare core.
442 *
443 * The best way to handle this scenario is to program the TD bit
444 * always. It affects only the traffic from root port to downstream
445 * devices.
446 *
447 * At this point,
448 * When ECRC is enabled in AER registers, everything works normally
449 * When ECRC is NOT enabled in AER registers, then,
450 * on Root Port:- TLP Digest (DWord size) gets appended to each packet
451 * even through it is not required. Since downstream
452 * TLPs are mostly for configuration accesses and BAR
453 * accesses, they are not in critical path and won't
454 * have much negative effect on the performance.
455 * on End Point:- TLP Digest is received for some/all the packets coming
456 * from the root port. TLP Digest is ignored because,
457 * as per the PCIe Spec r5.0 v1.0 section 2.2.3
458 * "TLP Digest Rules", when an endpoint receives TLP
459 * Digest when its ECRC check functionality is disabled
460 * in AER registers, received TLP Digest is just ignored.
461 * Since there is no issue or error reported either side, best way to
462 * handle the scenario is to program TD bit by default.
463 */
464
465 return val | PCIE_ATU_TD;
466 }
467
__dw_pcie_prog_outbound_atu(struct dw_pcie * pci,u8 func_no,int index,int type,u64 cpu_addr,u64 pci_addr,u64 size)468 static int __dw_pcie_prog_outbound_atu(struct dw_pcie *pci, u8 func_no,
469 int index, int type, u64 cpu_addr,
470 u64 pci_addr, u64 size)
471 {
472 u32 retries, val;
473 u64 limit_addr;
474
475 if (pci->ops && pci->ops->cpu_addr_fixup)
476 cpu_addr = pci->ops->cpu_addr_fixup(pci, cpu_addr);
477
478 limit_addr = cpu_addr + size - 1;
479
480 if ((limit_addr & ~pci->region_limit) != (cpu_addr & ~pci->region_limit) ||
481 !IS_ALIGNED(cpu_addr, pci->region_align) ||
482 !IS_ALIGNED(pci_addr, pci->region_align) || !size) {
483 return -EINVAL;
484 }
485
486 dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_LOWER_BASE,
487 lower_32_bits(cpu_addr));
488 dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_UPPER_BASE,
489 upper_32_bits(cpu_addr));
490
491 dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_LIMIT,
492 lower_32_bits(limit_addr));
493 if (dw_pcie_ver_is_ge(pci, 460A))
494 dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_UPPER_LIMIT,
495 upper_32_bits(limit_addr));
496
497 dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_LOWER_TARGET,
498 lower_32_bits(pci_addr));
499 dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_UPPER_TARGET,
500 upper_32_bits(pci_addr));
501
502 val = type | PCIE_ATU_FUNC_NUM(func_no);
503 if (upper_32_bits(limit_addr) > upper_32_bits(cpu_addr) &&
504 dw_pcie_ver_is_ge(pci, 460A))
505 val |= PCIE_ATU_INCREASE_REGION_SIZE;
506 if (dw_pcie_ver_is(pci, 490A))
507 val = dw_pcie_enable_ecrc(val);
508 dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_REGION_CTRL1, val);
509
510 dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_REGION_CTRL2, PCIE_ATU_ENABLE);
511
512 /*
513 * Make sure ATU enable takes effect before any subsequent config
514 * and I/O accesses.
515 */
516 for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
517 val = dw_pcie_readl_atu_ob(pci, index, PCIE_ATU_REGION_CTRL2);
518 if (val & PCIE_ATU_ENABLE)
519 return 0;
520
521 mdelay(LINK_WAIT_IATU);
522 }
523
524 dev_err(pci->dev, "Outbound iATU is not being enabled\n");
525
526 return -ETIMEDOUT;
527 }
528
dw_pcie_prog_outbound_atu(struct dw_pcie * pci,int index,int type,u64 cpu_addr,u64 pci_addr,u64 size)529 int dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
530 u64 cpu_addr, u64 pci_addr, u64 size)
531 {
532 return __dw_pcie_prog_outbound_atu(pci, 0, index, type,
533 cpu_addr, pci_addr, size);
534 }
535
dw_pcie_prog_ep_outbound_atu(struct dw_pcie * pci,u8 func_no,int index,int type,u64 cpu_addr,u64 pci_addr,u64 size)536 int dw_pcie_prog_ep_outbound_atu(struct dw_pcie *pci, u8 func_no, int index,
537 int type, u64 cpu_addr, u64 pci_addr,
538 u64 size)
539 {
540 return __dw_pcie_prog_outbound_atu(pci, func_no, index, type,
541 cpu_addr, pci_addr, size);
542 }
543
dw_pcie_readl_atu_ib(struct dw_pcie * pci,u32 index,u32 reg)544 static inline u32 dw_pcie_readl_atu_ib(struct dw_pcie *pci, u32 index, u32 reg)
545 {
546 return dw_pcie_readl_atu(pci, PCIE_ATU_REGION_DIR_IB, index, reg);
547 }
548
dw_pcie_writel_atu_ib(struct dw_pcie * pci,u32 index,u32 reg,u32 val)549 static inline void dw_pcie_writel_atu_ib(struct dw_pcie *pci, u32 index, u32 reg,
550 u32 val)
551 {
552 dw_pcie_writel_atu(pci, PCIE_ATU_REGION_DIR_IB, index, reg, val);
553 }
554
dw_pcie_prog_inbound_atu(struct dw_pcie * pci,int index,int type,u64 cpu_addr,u64 pci_addr,u64 size)555 int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int type,
556 u64 cpu_addr, u64 pci_addr, u64 size)
557 {
558 u64 limit_addr = pci_addr + size - 1;
559 u32 retries, val;
560
561 if ((limit_addr & ~pci->region_limit) != (pci_addr & ~pci->region_limit) ||
562 !IS_ALIGNED(cpu_addr, pci->region_align) ||
563 !IS_ALIGNED(pci_addr, pci->region_align) || !size) {
564 return -EINVAL;
565 }
566
567 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_LOWER_BASE,
568 lower_32_bits(pci_addr));
569 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_UPPER_BASE,
570 upper_32_bits(pci_addr));
571
572 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_LIMIT,
573 lower_32_bits(limit_addr));
574 if (dw_pcie_ver_is_ge(pci, 460A))
575 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_UPPER_LIMIT,
576 upper_32_bits(limit_addr));
577
578 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_LOWER_TARGET,
579 lower_32_bits(cpu_addr));
580 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_UPPER_TARGET,
581 upper_32_bits(cpu_addr));
582
583 val = type;
584 if (upper_32_bits(limit_addr) > upper_32_bits(pci_addr) &&
585 dw_pcie_ver_is_ge(pci, 460A))
586 val |= PCIE_ATU_INCREASE_REGION_SIZE;
587 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_REGION_CTRL1, val);
588 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_REGION_CTRL2, PCIE_ATU_ENABLE);
589
590 /*
591 * Make sure ATU enable takes effect before any subsequent config
592 * and I/O accesses.
593 */
594 for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
595 val = dw_pcie_readl_atu_ib(pci, index, PCIE_ATU_REGION_CTRL2);
596 if (val & PCIE_ATU_ENABLE)
597 return 0;
598
599 mdelay(LINK_WAIT_IATU);
600 }
601
602 dev_err(pci->dev, "Inbound iATU is not being enabled\n");
603
604 return -ETIMEDOUT;
605 }
606
dw_pcie_prog_ep_inbound_atu(struct dw_pcie * pci,u8 func_no,int index,int type,u64 cpu_addr,u8 bar)607 int dw_pcie_prog_ep_inbound_atu(struct dw_pcie *pci, u8 func_no, int index,
608 int type, u64 cpu_addr, u8 bar)
609 {
610 u32 retries, val;
611
612 if (!IS_ALIGNED(cpu_addr, pci->region_align))
613 return -EINVAL;
614
615 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_LOWER_TARGET,
616 lower_32_bits(cpu_addr));
617 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_UPPER_TARGET,
618 upper_32_bits(cpu_addr));
619
620 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_REGION_CTRL1, type |
621 PCIE_ATU_FUNC_NUM(func_no));
622 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_REGION_CTRL2,
623 PCIE_ATU_ENABLE | PCIE_ATU_FUNC_NUM_MATCH_EN |
624 PCIE_ATU_BAR_MODE_ENABLE | (bar << 8));
625
626 /*
627 * Make sure ATU enable takes effect before any subsequent config
628 * and I/O accesses.
629 */
630 for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
631 val = dw_pcie_readl_atu_ib(pci, index, PCIE_ATU_REGION_CTRL2);
632 if (val & PCIE_ATU_ENABLE)
633 return 0;
634
635 mdelay(LINK_WAIT_IATU);
636 }
637
638 dev_err(pci->dev, "Inbound iATU is not being enabled\n");
639
640 return -ETIMEDOUT;
641 }
642
dw_pcie_disable_atu(struct dw_pcie * pci,u32 dir,int index)643 void dw_pcie_disable_atu(struct dw_pcie *pci, u32 dir, int index)
644 {
645 dw_pcie_writel_atu(pci, dir, index, PCIE_ATU_REGION_CTRL2, 0);
646 }
647
dw_pcie_wait_for_link(struct dw_pcie * pci)648 int dw_pcie_wait_for_link(struct dw_pcie *pci)
649 {
650 u32 offset, val;
651 int retries;
652
653 /* Check if the link is up or not */
654 for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) {
655 if (dw_pcie_link_up(pci))
656 break;
657
658 usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX);
659 }
660
661 if (retries >= LINK_WAIT_MAX_RETRIES) {
662 dev_info(pci->dev, "Phy link never came up\n");
663 return -ETIMEDOUT;
664 }
665
666 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
667 val = dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKSTA);
668
669 dev_info(pci->dev, "PCIe Gen.%u x%u link up\n",
670 FIELD_GET(PCI_EXP_LNKSTA_CLS, val),
671 FIELD_GET(PCI_EXP_LNKSTA_NLW, val));
672
673 return 0;
674 }
675 EXPORT_SYMBOL_GPL(dw_pcie_wait_for_link);
676
dw_pcie_link_up(struct dw_pcie * pci)677 int dw_pcie_link_up(struct dw_pcie *pci)
678 {
679 u32 val;
680
681 if (pci->ops && pci->ops->link_up)
682 return pci->ops->link_up(pci);
683
684 val = dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG1);
685 return ((val & PCIE_PORT_DEBUG1_LINK_UP) &&
686 (!(val & PCIE_PORT_DEBUG1_LINK_IN_TRAINING)));
687 }
688 EXPORT_SYMBOL_GPL(dw_pcie_link_up);
689
dw_pcie_upconfig_setup(struct dw_pcie * pci)690 void dw_pcie_upconfig_setup(struct dw_pcie *pci)
691 {
692 u32 val;
693
694 val = dw_pcie_readl_dbi(pci, PCIE_PORT_MULTI_LANE_CTRL);
695 val |= PORT_MLTI_UPCFG_SUPPORT;
696 dw_pcie_writel_dbi(pci, PCIE_PORT_MULTI_LANE_CTRL, val);
697 }
698 EXPORT_SYMBOL_GPL(dw_pcie_upconfig_setup);
699
dw_pcie_link_set_max_speed(struct dw_pcie * pci,u32 link_gen)700 static void dw_pcie_link_set_max_speed(struct dw_pcie *pci, u32 link_gen)
701 {
702 u32 cap, ctrl2, link_speed;
703 u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
704
705 cap = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCAP);
706 ctrl2 = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCTL2);
707 ctrl2 &= ~PCI_EXP_LNKCTL2_TLS;
708
709 switch (pcie_link_speed[link_gen]) {
710 case PCIE_SPEED_2_5GT:
711 link_speed = PCI_EXP_LNKCTL2_TLS_2_5GT;
712 break;
713 case PCIE_SPEED_5_0GT:
714 link_speed = PCI_EXP_LNKCTL2_TLS_5_0GT;
715 break;
716 case PCIE_SPEED_8_0GT:
717 link_speed = PCI_EXP_LNKCTL2_TLS_8_0GT;
718 break;
719 case PCIE_SPEED_16_0GT:
720 link_speed = PCI_EXP_LNKCTL2_TLS_16_0GT;
721 break;
722 default:
723 /* Use hardware capability */
724 link_speed = FIELD_GET(PCI_EXP_LNKCAP_SLS, cap);
725 ctrl2 &= ~PCI_EXP_LNKCTL2_HASD;
726 break;
727 }
728
729 dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCTL2, ctrl2 | link_speed);
730
731 cap &= ~((u32)PCI_EXP_LNKCAP_SLS);
732 dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCAP, cap | link_speed);
733
734 }
735
dw_pcie_link_set_max_link_width(struct dw_pcie * pci,u32 num_lanes)736 static void dw_pcie_link_set_max_link_width(struct dw_pcie *pci, u32 num_lanes)
737 {
738 u32 lnkcap, lwsc, plc;
739 u8 cap;
740
741 if (!num_lanes)
742 return;
743
744 /* Set the number of lanes */
745 plc = dw_pcie_readl_dbi(pci, PCIE_PORT_LINK_CONTROL);
746 plc &= ~PORT_LINK_FAST_LINK_MODE;
747 plc &= ~PORT_LINK_MODE_MASK;
748
749 /* Set link width speed control register */
750 lwsc = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
751 lwsc &= ~PORT_LOGIC_LINK_WIDTH_MASK;
752 switch (num_lanes) {
753 case 1:
754 plc |= PORT_LINK_MODE_1_LANES;
755 lwsc |= PORT_LOGIC_LINK_WIDTH_1_LANES;
756 break;
757 case 2:
758 plc |= PORT_LINK_MODE_2_LANES;
759 lwsc |= PORT_LOGIC_LINK_WIDTH_2_LANES;
760 break;
761 case 4:
762 plc |= PORT_LINK_MODE_4_LANES;
763 lwsc |= PORT_LOGIC_LINK_WIDTH_4_LANES;
764 break;
765 case 8:
766 plc |= PORT_LINK_MODE_8_LANES;
767 lwsc |= PORT_LOGIC_LINK_WIDTH_8_LANES;
768 break;
769 default:
770 dev_err(pci->dev, "num-lanes %u: invalid value\n", num_lanes);
771 return;
772 }
773 dw_pcie_writel_dbi(pci, PCIE_PORT_LINK_CONTROL, plc);
774 dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, lwsc);
775
776 cap = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
777 lnkcap = dw_pcie_readl_dbi(pci, cap + PCI_EXP_LNKCAP);
778 lnkcap &= ~PCI_EXP_LNKCAP_MLW;
779 lnkcap |= FIELD_PREP(PCI_EXP_LNKCAP_MLW, num_lanes);
780 dw_pcie_writel_dbi(pci, cap + PCI_EXP_LNKCAP, lnkcap);
781 }
782
dw_pcie_iatu_detect(struct dw_pcie * pci)783 void dw_pcie_iatu_detect(struct dw_pcie *pci)
784 {
785 int max_region, ob, ib;
786 u32 val, min, dir;
787 u64 max;
788
789 val = dw_pcie_readl_dbi(pci, PCIE_ATU_VIEWPORT);
790 if (val == 0xFFFFFFFF) {
791 dw_pcie_cap_set(pci, IATU_UNROLL);
792
793 max_region = min((int)pci->atu_size / 512, 256);
794 } else {
795 pci->atu_base = pci->dbi_base + PCIE_ATU_VIEWPORT_BASE;
796 pci->atu_size = PCIE_ATU_VIEWPORT_SIZE;
797
798 dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, 0xFF);
799 max_region = dw_pcie_readl_dbi(pci, PCIE_ATU_VIEWPORT) + 1;
800 }
801
802 for (ob = 0; ob < max_region; ob++) {
803 dw_pcie_writel_atu_ob(pci, ob, PCIE_ATU_LOWER_TARGET, 0x11110000);
804 val = dw_pcie_readl_atu_ob(pci, ob, PCIE_ATU_LOWER_TARGET);
805 if (val != 0x11110000)
806 break;
807 }
808
809 for (ib = 0; ib < max_region; ib++) {
810 dw_pcie_writel_atu_ib(pci, ib, PCIE_ATU_LOWER_TARGET, 0x11110000);
811 val = dw_pcie_readl_atu_ib(pci, ib, PCIE_ATU_LOWER_TARGET);
812 if (val != 0x11110000)
813 break;
814 }
815
816 if (ob) {
817 dir = PCIE_ATU_REGION_DIR_OB;
818 } else if (ib) {
819 dir = PCIE_ATU_REGION_DIR_IB;
820 } else {
821 dev_err(pci->dev, "No iATU regions found\n");
822 return;
823 }
824
825 dw_pcie_writel_atu(pci, dir, 0, PCIE_ATU_LIMIT, 0x0);
826 min = dw_pcie_readl_atu(pci, dir, 0, PCIE_ATU_LIMIT);
827
828 if (dw_pcie_ver_is_ge(pci, 460A)) {
829 dw_pcie_writel_atu(pci, dir, 0, PCIE_ATU_UPPER_LIMIT, 0xFFFFFFFF);
830 max = dw_pcie_readl_atu(pci, dir, 0, PCIE_ATU_UPPER_LIMIT);
831 } else {
832 max = 0;
833 }
834
835 pci->num_ob_windows = ob;
836 pci->num_ib_windows = ib;
837 pci->region_align = 1 << fls(min);
838 pci->region_limit = (max << 32) | (SZ_4G - 1);
839
840 dev_info(pci->dev, "iATU: unroll %s, %u ob, %u ib, align %uK, limit %lluG\n",
841 dw_pcie_cap_is(pci, IATU_UNROLL) ? "T" : "F",
842 pci->num_ob_windows, pci->num_ib_windows,
843 pci->region_align / SZ_1K, (pci->region_limit + 1) / SZ_1G);
844 }
845
dw_pcie_readl_dma(struct dw_pcie * pci,u32 reg)846 static u32 dw_pcie_readl_dma(struct dw_pcie *pci, u32 reg)
847 {
848 u32 val = 0;
849 int ret;
850
851 if (pci->ops && pci->ops->read_dbi)
852 return pci->ops->read_dbi(pci, pci->edma.reg_base, reg, 4);
853
854 ret = dw_pcie_read(pci->edma.reg_base + reg, 4, &val);
855 if (ret)
856 dev_err(pci->dev, "Read DMA address failed\n");
857
858 return val;
859 }
860
dw_pcie_edma_irq_vector(struct device * dev,unsigned int nr)861 static int dw_pcie_edma_irq_vector(struct device *dev, unsigned int nr)
862 {
863 struct platform_device *pdev = to_platform_device(dev);
864 char name[6];
865 int ret;
866
867 if (nr >= EDMA_MAX_WR_CH + EDMA_MAX_RD_CH)
868 return -EINVAL;
869
870 ret = platform_get_irq_byname_optional(pdev, "dma");
871 if (ret > 0)
872 return ret;
873
874 snprintf(name, sizeof(name), "dma%u", nr);
875
876 return platform_get_irq_byname_optional(pdev, name);
877 }
878
879 static struct dw_edma_plat_ops dw_pcie_edma_ops = {
880 .irq_vector = dw_pcie_edma_irq_vector,
881 };
882
dw_pcie_edma_find_chip(struct dw_pcie * pci)883 static int dw_pcie_edma_find_chip(struct dw_pcie *pci)
884 {
885 u32 val;
886
887 /*
888 * Indirect eDMA CSRs access has been completely removed since v5.40a
889 * thus no space is now reserved for the eDMA channels viewport and
890 * former DMA CTRL register is no longer fixed to FFs.
891 *
892 * Note that Renesas R-Car S4-8's PCIe controllers for unknown reason
893 * have zeros in the eDMA CTRL register even though the HW-manual
894 * explicitly states there must FFs if the unrolled mapping is enabled.
895 * For such cases the low-level drivers are supposed to manually
896 * activate the unrolled mapping to bypass the auto-detection procedure.
897 */
898 if (dw_pcie_ver_is_ge(pci, 540A) || dw_pcie_cap_is(pci, EDMA_UNROLL))
899 val = 0xFFFFFFFF;
900 else
901 val = dw_pcie_readl_dbi(pci, PCIE_DMA_VIEWPORT_BASE + PCIE_DMA_CTRL);
902
903 if (val == 0xFFFFFFFF && pci->edma.reg_base) {
904 pci->edma.mf = EDMA_MF_EDMA_UNROLL;
905
906 val = dw_pcie_readl_dma(pci, PCIE_DMA_CTRL);
907 } else if (val != 0xFFFFFFFF) {
908 pci->edma.mf = EDMA_MF_EDMA_LEGACY;
909
910 pci->edma.reg_base = pci->dbi_base + PCIE_DMA_VIEWPORT_BASE;
911 } else {
912 return -ENODEV;
913 }
914
915 pci->edma.dev = pci->dev;
916
917 if (!pci->edma.ops)
918 pci->edma.ops = &dw_pcie_edma_ops;
919
920 pci->edma.flags |= DW_EDMA_CHIP_LOCAL;
921
922 pci->edma.ll_wr_cnt = FIELD_GET(PCIE_DMA_NUM_WR_CHAN, val);
923 pci->edma.ll_rd_cnt = FIELD_GET(PCIE_DMA_NUM_RD_CHAN, val);
924
925 /* Sanity check the channels count if the mapping was incorrect */
926 if (!pci->edma.ll_wr_cnt || pci->edma.ll_wr_cnt > EDMA_MAX_WR_CH ||
927 !pci->edma.ll_rd_cnt || pci->edma.ll_rd_cnt > EDMA_MAX_RD_CH)
928 return -EINVAL;
929
930 return 0;
931 }
932
dw_pcie_edma_irq_verify(struct dw_pcie * pci)933 static int dw_pcie_edma_irq_verify(struct dw_pcie *pci)
934 {
935 struct platform_device *pdev = to_platform_device(pci->dev);
936 u16 ch_cnt = pci->edma.ll_wr_cnt + pci->edma.ll_rd_cnt;
937 char name[6];
938 int ret;
939
940 if (pci->edma.nr_irqs == 1)
941 return 0;
942 else if (pci->edma.nr_irqs > 1)
943 return pci->edma.nr_irqs != ch_cnt ? -EINVAL : 0;
944
945 ret = platform_get_irq_byname_optional(pdev, "dma");
946 if (ret > 0) {
947 pci->edma.nr_irqs = 1;
948 return 0;
949 }
950
951 for (; pci->edma.nr_irqs < ch_cnt; pci->edma.nr_irqs++) {
952 snprintf(name, sizeof(name), "dma%d", pci->edma.nr_irqs);
953
954 ret = platform_get_irq_byname_optional(pdev, name);
955 if (ret <= 0)
956 return -EINVAL;
957 }
958
959 return 0;
960 }
961
dw_pcie_edma_ll_alloc(struct dw_pcie * pci)962 static int dw_pcie_edma_ll_alloc(struct dw_pcie *pci)
963 {
964 struct dw_edma_region *ll;
965 dma_addr_t paddr;
966 int i;
967
968 for (i = 0; i < pci->edma.ll_wr_cnt; i++) {
969 ll = &pci->edma.ll_region_wr[i];
970 ll->sz = DMA_LLP_MEM_SIZE;
971 ll->vaddr.mem = dmam_alloc_coherent(pci->dev, ll->sz,
972 &paddr, GFP_KERNEL);
973 if (!ll->vaddr.mem)
974 return -ENOMEM;
975
976 ll->paddr = paddr;
977 }
978
979 for (i = 0; i < pci->edma.ll_rd_cnt; i++) {
980 ll = &pci->edma.ll_region_rd[i];
981 ll->sz = DMA_LLP_MEM_SIZE;
982 ll->vaddr.mem = dmam_alloc_coherent(pci->dev, ll->sz,
983 &paddr, GFP_KERNEL);
984 if (!ll->vaddr.mem)
985 return -ENOMEM;
986
987 ll->paddr = paddr;
988 }
989
990 return 0;
991 }
992
dw_pcie_edma_detect(struct dw_pcie * pci)993 int dw_pcie_edma_detect(struct dw_pcie *pci)
994 {
995 int ret;
996
997 /* Don't fail if no eDMA was found (for the backward compatibility) */
998 ret = dw_pcie_edma_find_chip(pci);
999 if (ret)
1000 return 0;
1001
1002 /* Don't fail on the IRQs verification (for the backward compatibility) */
1003 ret = dw_pcie_edma_irq_verify(pci);
1004 if (ret) {
1005 dev_err(pci->dev, "Invalid eDMA IRQs found\n");
1006 return 0;
1007 }
1008
1009 ret = dw_pcie_edma_ll_alloc(pci);
1010 if (ret) {
1011 dev_err(pci->dev, "Couldn't allocate LLP memory\n");
1012 return ret;
1013 }
1014
1015 /* Don't fail if the DW eDMA driver can't find the device */
1016 ret = dw_edma_probe(&pci->edma);
1017 if (ret && ret != -ENODEV) {
1018 dev_err(pci->dev, "Couldn't register eDMA device\n");
1019 return ret;
1020 }
1021
1022 dev_info(pci->dev, "eDMA: unroll %s, %hu wr, %hu rd\n",
1023 pci->edma.mf == EDMA_MF_EDMA_UNROLL ? "T" : "F",
1024 pci->edma.ll_wr_cnt, pci->edma.ll_rd_cnt);
1025
1026 return 0;
1027 }
1028
dw_pcie_edma_remove(struct dw_pcie * pci)1029 void dw_pcie_edma_remove(struct dw_pcie *pci)
1030 {
1031 dw_edma_remove(&pci->edma);
1032 }
1033
dw_pcie_setup(struct dw_pcie * pci)1034 void dw_pcie_setup(struct dw_pcie *pci)
1035 {
1036 u32 val;
1037
1038 if (pci->link_gen > 0)
1039 dw_pcie_link_set_max_speed(pci, pci->link_gen);
1040
1041 /* Configure Gen1 N_FTS */
1042 if (pci->n_fts[0]) {
1043 val = dw_pcie_readl_dbi(pci, PCIE_PORT_AFR);
1044 val &= ~(PORT_AFR_N_FTS_MASK | PORT_AFR_CC_N_FTS_MASK);
1045 val |= PORT_AFR_N_FTS(pci->n_fts[0]);
1046 val |= PORT_AFR_CC_N_FTS(pci->n_fts[0]);
1047 dw_pcie_writel_dbi(pci, PCIE_PORT_AFR, val);
1048 }
1049
1050 /* Configure Gen2+ N_FTS */
1051 if (pci->n_fts[1]) {
1052 val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
1053 val &= ~PORT_LOGIC_N_FTS_MASK;
1054 val |= pci->n_fts[1];
1055 dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
1056 }
1057
1058 if (dw_pcie_cap_is(pci, CDM_CHECK)) {
1059 val = dw_pcie_readl_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS);
1060 val |= PCIE_PL_CHK_REG_CHK_REG_CONTINUOUS |
1061 PCIE_PL_CHK_REG_CHK_REG_START;
1062 dw_pcie_writel_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS, val);
1063 }
1064
1065 val = dw_pcie_readl_dbi(pci, PCIE_PORT_LINK_CONTROL);
1066 val &= ~PORT_LINK_FAST_LINK_MODE;
1067 val |= PORT_LINK_DLL_LINK_EN;
1068 dw_pcie_writel_dbi(pci, PCIE_PORT_LINK_CONTROL, val);
1069
1070 dw_pcie_link_set_max_link_width(pci, pci->num_lanes);
1071 }
1072