1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2007, 2008, 2009, 2010, 2011 Cavium Networks
7 */
8 #include <linux/kernel.h>
9 #include <linux/init.h>
10 #include <linux/pci.h>
11 #include <linux/interrupt.h>
12 #include <linux/time.h>
13 #include <linux/delay.h>
14 #include <linux/moduleparam.h>
15
16 #include <asm/octeon/octeon.h>
17 #include <asm/octeon/cvmx-npei-defs.h>
18 #include <asm/octeon/cvmx-pciercx-defs.h>
19 #include <asm/octeon/cvmx-pescx-defs.h>
20 #include <asm/octeon/cvmx-pexp-defs.h>
21 #include <asm/octeon/cvmx-pemx-defs.h>
22 #include <asm/octeon/cvmx-dpi-defs.h>
23 #include <asm/octeon/cvmx-sli-defs.h>
24 #include <asm/octeon/cvmx-sriox-defs.h>
25 #include <asm/octeon/cvmx-helper-errata.h>
26 #include <asm/octeon/pci-octeon.h>
27
28 #define MRRS_CN5XXX 0 /* 128 byte Max Read Request Size */
29 #define MPS_CN5XXX 0 /* 128 byte Max Packet Size (Limit of most PCs) */
30 #define MRRS_CN6XXX 3 /* 1024 byte Max Read Request Size */
31 #define MPS_CN6XXX 0 /* 128 byte Max Packet Size (Limit of most PCs) */
32
33 /* Module parameter to disable PCI probing */
34 static int pcie_disable;
35 module_param(pcie_disable, int, S_IRUGO);
36
37 static int enable_pcie_14459_war;
38 static int enable_pcie_bus_num_war[2];
39
40 union cvmx_pcie_address {
41 uint64_t u64;
42 struct {
43 uint64_t upper:2; /* Normally 2 for XKPHYS */
44 uint64_t reserved_49_61:13; /* Must be zero */
45 uint64_t io:1; /* 1 for IO space access */
46 uint64_t did:5; /* PCIe DID = 3 */
47 uint64_t subdid:3; /* PCIe SubDID = 1 */
48 uint64_t reserved_36_39:4; /* Must be zero */
49 uint64_t es:2; /* Endian swap = 1 */
50 uint64_t port:2; /* PCIe port 0,1 */
51 uint64_t reserved_29_31:3; /* Must be zero */
52 /*
53 * Selects the type of the configuration request (0 = type 0,
54 * 1 = type 1).
55 */
56 uint64_t ty:1;
57 /* Target bus number sent in the ID in the request. */
58 uint64_t bus:8;
59 /*
60 * Target device number sent in the ID in the
61 * request. Note that Dev must be zero for type 0
62 * configuration requests.
63 */
64 uint64_t dev:5;
65 /* Target function number sent in the ID in the request. */
66 uint64_t func:3;
67 /*
68 * Selects a register in the configuration space of
69 * the target.
70 */
71 uint64_t reg:12;
72 } config;
73 struct {
74 uint64_t upper:2; /* Normally 2 for XKPHYS */
75 uint64_t reserved_49_61:13; /* Must be zero */
76 uint64_t io:1; /* 1 for IO space access */
77 uint64_t did:5; /* PCIe DID = 3 */
78 uint64_t subdid:3; /* PCIe SubDID = 2 */
79 uint64_t reserved_36_39:4; /* Must be zero */
80 uint64_t es:2; /* Endian swap = 1 */
81 uint64_t port:2; /* PCIe port 0,1 */
82 uint64_t address:32; /* PCIe IO address */
83 } io;
84 struct {
85 uint64_t upper:2; /* Normally 2 for XKPHYS */
86 uint64_t reserved_49_61:13; /* Must be zero */
87 uint64_t io:1; /* 1 for IO space access */
88 uint64_t did:5; /* PCIe DID = 3 */
89 uint64_t subdid:3; /* PCIe SubDID = 3-6 */
90 uint64_t reserved_36_39:4; /* Must be zero */
91 uint64_t address:36; /* PCIe Mem address */
92 } mem;
93 };
94
95 static int cvmx_pcie_rc_initialize(int pcie_port);
96
97 /**
98 * Return the Core virtual base address for PCIe IO access. IOs are
99 * read/written as an offset from this address.
100 *
101 * @pcie_port: PCIe port the IO is for
102 *
103 * Returns 64bit Octeon IO base address for read/write
104 */
cvmx_pcie_get_io_base_address(int pcie_port)105 static inline uint64_t cvmx_pcie_get_io_base_address(int pcie_port)
106 {
107 union cvmx_pcie_address pcie_addr;
108 pcie_addr.u64 = 0;
109 pcie_addr.io.upper = 0;
110 pcie_addr.io.io = 1;
111 pcie_addr.io.did = 3;
112 pcie_addr.io.subdid = 2;
113 pcie_addr.io.es = 1;
114 pcie_addr.io.port = pcie_port;
115 return pcie_addr.u64;
116 }
117
118 /**
119 * Size of the IO address region returned at address
120 * cvmx_pcie_get_io_base_address()
121 *
122 * @pcie_port: PCIe port the IO is for
123 *
124 * Returns Size of the IO window
125 */
cvmx_pcie_get_io_size(int pcie_port)126 static inline uint64_t cvmx_pcie_get_io_size(int pcie_port)
127 {
128 return 1ull << 32;
129 }
130
131 /**
132 * Return the Core virtual base address for PCIe MEM access. Memory is
133 * read/written as an offset from this address.
134 *
135 * @pcie_port: PCIe port the IO is for
136 *
137 * Returns 64bit Octeon IO base address for read/write
138 */
cvmx_pcie_get_mem_base_address(int pcie_port)139 static inline uint64_t cvmx_pcie_get_mem_base_address(int pcie_port)
140 {
141 union cvmx_pcie_address pcie_addr;
142 pcie_addr.u64 = 0;
143 pcie_addr.mem.upper = 0;
144 pcie_addr.mem.io = 1;
145 pcie_addr.mem.did = 3;
146 pcie_addr.mem.subdid = 3 + pcie_port;
147 return pcie_addr.u64;
148 }
149
150 /**
151 * Size of the Mem address region returned at address
152 * cvmx_pcie_get_mem_base_address()
153 *
154 * @pcie_port: PCIe port the IO is for
155 *
156 * Returns Size of the Mem window
157 */
cvmx_pcie_get_mem_size(int pcie_port)158 static inline uint64_t cvmx_pcie_get_mem_size(int pcie_port)
159 {
160 return 1ull << 36;
161 }
162
163 /**
164 * Read a PCIe config space register indirectly. This is used for
165 * registers of the form PCIEEP_CFG??? and PCIERC?_CFG???.
166 *
167 * @pcie_port: PCIe port to read from
168 * @cfg_offset: Address to read
169 *
170 * Returns Value read
171 */
cvmx_pcie_cfgx_read(int pcie_port,uint32_t cfg_offset)172 static uint32_t cvmx_pcie_cfgx_read(int pcie_port, uint32_t cfg_offset)
173 {
174 if (octeon_has_feature(OCTEON_FEATURE_NPEI)) {
175 union cvmx_pescx_cfg_rd pescx_cfg_rd;
176 pescx_cfg_rd.u64 = 0;
177 pescx_cfg_rd.s.addr = cfg_offset;
178 cvmx_write_csr(CVMX_PESCX_CFG_RD(pcie_port), pescx_cfg_rd.u64);
179 pescx_cfg_rd.u64 = cvmx_read_csr(CVMX_PESCX_CFG_RD(pcie_port));
180 return pescx_cfg_rd.s.data;
181 } else {
182 union cvmx_pemx_cfg_rd pemx_cfg_rd;
183 pemx_cfg_rd.u64 = 0;
184 pemx_cfg_rd.s.addr = cfg_offset;
185 cvmx_write_csr(CVMX_PEMX_CFG_RD(pcie_port), pemx_cfg_rd.u64);
186 pemx_cfg_rd.u64 = cvmx_read_csr(CVMX_PEMX_CFG_RD(pcie_port));
187 return pemx_cfg_rd.s.data;
188 }
189 }
190
191 /**
192 * Write a PCIe config space register indirectly. This is used for
193 * registers of the form PCIEEP_CFG??? and PCIERC?_CFG???.
194 *
195 * @pcie_port: PCIe port to write to
196 * @cfg_offset: Address to write
197 * @val: Value to write
198 */
cvmx_pcie_cfgx_write(int pcie_port,uint32_t cfg_offset,uint32_t val)199 static void cvmx_pcie_cfgx_write(int pcie_port, uint32_t cfg_offset,
200 uint32_t val)
201 {
202 if (octeon_has_feature(OCTEON_FEATURE_NPEI)) {
203 union cvmx_pescx_cfg_wr pescx_cfg_wr;
204 pescx_cfg_wr.u64 = 0;
205 pescx_cfg_wr.s.addr = cfg_offset;
206 pescx_cfg_wr.s.data = val;
207 cvmx_write_csr(CVMX_PESCX_CFG_WR(pcie_port), pescx_cfg_wr.u64);
208 } else {
209 union cvmx_pemx_cfg_wr pemx_cfg_wr;
210 pemx_cfg_wr.u64 = 0;
211 pemx_cfg_wr.s.addr = cfg_offset;
212 pemx_cfg_wr.s.data = val;
213 cvmx_write_csr(CVMX_PEMX_CFG_WR(pcie_port), pemx_cfg_wr.u64);
214 }
215 }
216
217 /**
218 * Build a PCIe config space request address for a device
219 *
220 * @pcie_port: PCIe port to access
221 * @bus: Sub bus
222 * @dev: Device ID
223 * @fn: Device sub function
224 * @reg: Register to access
225 *
226 * Returns 64bit Octeon IO address
227 */
__cvmx_pcie_build_config_addr(int pcie_port,int bus,int dev,int fn,int reg)228 static inline uint64_t __cvmx_pcie_build_config_addr(int pcie_port, int bus,
229 int dev, int fn, int reg)
230 {
231 union cvmx_pcie_address pcie_addr;
232 union cvmx_pciercx_cfg006 pciercx_cfg006;
233
234 pciercx_cfg006.u32 =
235 cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG006(pcie_port));
236 if ((bus <= pciercx_cfg006.s.pbnum) && (dev != 0))
237 return 0;
238
239 pcie_addr.u64 = 0;
240 pcie_addr.config.upper = 2;
241 pcie_addr.config.io = 1;
242 pcie_addr.config.did = 3;
243 pcie_addr.config.subdid = 1;
244 pcie_addr.config.es = 1;
245 pcie_addr.config.port = pcie_port;
246 pcie_addr.config.ty = (bus > pciercx_cfg006.s.pbnum);
247 pcie_addr.config.bus = bus;
248 pcie_addr.config.dev = dev;
249 pcie_addr.config.func = fn;
250 pcie_addr.config.reg = reg;
251 return pcie_addr.u64;
252 }
253
254 /**
255 * Read 8bits from a Device's config space
256 *
257 * @pcie_port: PCIe port the device is on
258 * @bus: Sub bus
259 * @dev: Device ID
260 * @fn: Device sub function
261 * @reg: Register to access
262 *
263 * Returns Result of the read
264 */
cvmx_pcie_config_read8(int pcie_port,int bus,int dev,int fn,int reg)265 static uint8_t cvmx_pcie_config_read8(int pcie_port, int bus, int dev,
266 int fn, int reg)
267 {
268 uint64_t address =
269 __cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
270 if (address)
271 return cvmx_read64_uint8(address);
272 else
273 return 0xff;
274 }
275
276 /**
277 * Read 16bits from a Device's config space
278 *
279 * @pcie_port: PCIe port the device is on
280 * @bus: Sub bus
281 * @dev: Device ID
282 * @fn: Device sub function
283 * @reg: Register to access
284 *
285 * Returns Result of the read
286 */
cvmx_pcie_config_read16(int pcie_port,int bus,int dev,int fn,int reg)287 static uint16_t cvmx_pcie_config_read16(int pcie_port, int bus, int dev,
288 int fn, int reg)
289 {
290 uint64_t address =
291 __cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
292 if (address)
293 return le16_to_cpu(cvmx_read64_uint16(address));
294 else
295 return 0xffff;
296 }
297
298 /**
299 * Read 32bits from a Device's config space
300 *
301 * @pcie_port: PCIe port the device is on
302 * @bus: Sub bus
303 * @dev: Device ID
304 * @fn: Device sub function
305 * @reg: Register to access
306 *
307 * Returns Result of the read
308 */
cvmx_pcie_config_read32(int pcie_port,int bus,int dev,int fn,int reg)309 static uint32_t cvmx_pcie_config_read32(int pcie_port, int bus, int dev,
310 int fn, int reg)
311 {
312 uint64_t address =
313 __cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
314 if (address)
315 return le32_to_cpu(cvmx_read64_uint32(address));
316 else
317 return 0xffffffff;
318 }
319
320 /**
321 * Write 8bits to a Device's config space
322 *
323 * @pcie_port: PCIe port the device is on
324 * @bus: Sub bus
325 * @dev: Device ID
326 * @fn: Device sub function
327 * @reg: Register to access
328 * @val: Value to write
329 */
cvmx_pcie_config_write8(int pcie_port,int bus,int dev,int fn,int reg,uint8_t val)330 static void cvmx_pcie_config_write8(int pcie_port, int bus, int dev, int fn,
331 int reg, uint8_t val)
332 {
333 uint64_t address =
334 __cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
335 if (address)
336 cvmx_write64_uint8(address, val);
337 }
338
339 /**
340 * Write 16bits to a Device's config space
341 *
342 * @pcie_port: PCIe port the device is on
343 * @bus: Sub bus
344 * @dev: Device ID
345 * @fn: Device sub function
346 * @reg: Register to access
347 * @val: Value to write
348 */
cvmx_pcie_config_write16(int pcie_port,int bus,int dev,int fn,int reg,uint16_t val)349 static void cvmx_pcie_config_write16(int pcie_port, int bus, int dev, int fn,
350 int reg, uint16_t val)
351 {
352 uint64_t address =
353 __cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
354 if (address)
355 cvmx_write64_uint16(address, cpu_to_le16(val));
356 }
357
358 /**
359 * Write 32bits to a Device's config space
360 *
361 * @pcie_port: PCIe port the device is on
362 * @bus: Sub bus
363 * @dev: Device ID
364 * @fn: Device sub function
365 * @reg: Register to access
366 * @val: Value to write
367 */
cvmx_pcie_config_write32(int pcie_port,int bus,int dev,int fn,int reg,uint32_t val)368 static void cvmx_pcie_config_write32(int pcie_port, int bus, int dev, int fn,
369 int reg, uint32_t val)
370 {
371 uint64_t address =
372 __cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
373 if (address)
374 cvmx_write64_uint32(address, cpu_to_le32(val));
375 }
376
377 /**
378 * Initialize the RC config space CSRs
379 *
380 * @pcie_port: PCIe port to initialize
381 */
__cvmx_pcie_rc_initialize_config_space(int pcie_port)382 static void __cvmx_pcie_rc_initialize_config_space(int pcie_port)
383 {
384 union cvmx_pciercx_cfg030 pciercx_cfg030;
385 union cvmx_pciercx_cfg070 pciercx_cfg070;
386 union cvmx_pciercx_cfg001 pciercx_cfg001;
387 union cvmx_pciercx_cfg032 pciercx_cfg032;
388 union cvmx_pciercx_cfg006 pciercx_cfg006;
389 union cvmx_pciercx_cfg008 pciercx_cfg008;
390 union cvmx_pciercx_cfg009 pciercx_cfg009;
391 union cvmx_pciercx_cfg010 pciercx_cfg010;
392 union cvmx_pciercx_cfg011 pciercx_cfg011;
393 union cvmx_pciercx_cfg035 pciercx_cfg035;
394 union cvmx_pciercx_cfg075 pciercx_cfg075;
395 union cvmx_pciercx_cfg034 pciercx_cfg034;
396
397 /* Max Payload Size (PCIE*_CFG030[MPS]) */
398 /* Max Read Request Size (PCIE*_CFG030[MRRS]) */
399 /* Relaxed-order, no-snoop enables (PCIE*_CFG030[RO_EN,NS_EN] */
400 /* Error Message Enables (PCIE*_CFG030[CE_EN,NFE_EN,FE_EN,UR_EN]) */
401
402 pciercx_cfg030.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG030(pcie_port));
403 if (OCTEON_IS_MODEL(OCTEON_CN5XXX)) {
404 pciercx_cfg030.s.mps = MPS_CN5XXX;
405 pciercx_cfg030.s.mrrs = MRRS_CN5XXX;
406 } else {
407 pciercx_cfg030.s.mps = MPS_CN6XXX;
408 pciercx_cfg030.s.mrrs = MRRS_CN6XXX;
409 }
410 /*
411 * Enable relaxed order processing. This will allow devices to
412 * affect read response ordering.
413 */
414 pciercx_cfg030.s.ro_en = 1;
415 /* Enable no snoop processing. Not used by Octeon */
416 pciercx_cfg030.s.ns_en = 1;
417 /* Correctable error reporting enable. */
418 pciercx_cfg030.s.ce_en = 1;
419 /* Non-fatal error reporting enable. */
420 pciercx_cfg030.s.nfe_en = 1;
421 /* Fatal error reporting enable. */
422 pciercx_cfg030.s.fe_en = 1;
423 /* Unsupported request reporting enable. */
424 pciercx_cfg030.s.ur_en = 1;
425 cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG030(pcie_port), pciercx_cfg030.u32);
426
427
428 if (octeon_has_feature(OCTEON_FEATURE_NPEI)) {
429 union cvmx_npei_ctl_status2 npei_ctl_status2;
430 /*
431 * Max Payload Size (NPEI_CTL_STATUS2[MPS]) must match
432 * PCIE*_CFG030[MPS]. Max Read Request Size
433 * (NPEI_CTL_STATUS2[MRRS]) must not exceed
434 * PCIE*_CFG030[MRRS]
435 */
436 npei_ctl_status2.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_CTL_STATUS2);
437 /* Max payload size = 128 bytes for best Octeon DMA performance */
438 npei_ctl_status2.s.mps = MPS_CN5XXX;
439 /* Max read request size = 128 bytes for best Octeon DMA performance */
440 npei_ctl_status2.s.mrrs = MRRS_CN5XXX;
441 if (pcie_port)
442 npei_ctl_status2.s.c1_b1_s = 3; /* Port1 BAR1 Size 256MB */
443 else
444 npei_ctl_status2.s.c0_b1_s = 3; /* Port0 BAR1 Size 256MB */
445
446 cvmx_write_csr(CVMX_PEXP_NPEI_CTL_STATUS2, npei_ctl_status2.u64);
447 } else {
448 /*
449 * Max Payload Size (DPI_SLI_PRTX_CFG[MPS]) must match
450 * PCIE*_CFG030[MPS]. Max Read Request Size
451 * (DPI_SLI_PRTX_CFG[MRRS]) must not exceed
452 * PCIE*_CFG030[MRRS].
453 */
454 union cvmx_dpi_sli_prtx_cfg prt_cfg;
455 union cvmx_sli_s2m_portx_ctl sli_s2m_portx_ctl;
456 prt_cfg.u64 = cvmx_read_csr(CVMX_DPI_SLI_PRTX_CFG(pcie_port));
457 prt_cfg.s.mps = MPS_CN6XXX;
458 prt_cfg.s.mrrs = MRRS_CN6XXX;
459 /* Max outstanding load request. */
460 prt_cfg.s.molr = 32;
461 cvmx_write_csr(CVMX_DPI_SLI_PRTX_CFG(pcie_port), prt_cfg.u64);
462
463 sli_s2m_portx_ctl.u64 = cvmx_read_csr(CVMX_PEXP_SLI_S2M_PORTX_CTL(pcie_port));
464 sli_s2m_portx_ctl.s.mrrs = MRRS_CN6XXX;
465 cvmx_write_csr(CVMX_PEXP_SLI_S2M_PORTX_CTL(pcie_port), sli_s2m_portx_ctl.u64);
466 }
467
468 /* ECRC Generation (PCIE*_CFG070[GE,CE]) */
469 pciercx_cfg070.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG070(pcie_port));
470 pciercx_cfg070.s.ge = 1; /* ECRC generation enable. */
471 pciercx_cfg070.s.ce = 1; /* ECRC check enable. */
472 cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG070(pcie_port), pciercx_cfg070.u32);
473
474 /*
475 * Access Enables (PCIE*_CFG001[MSAE,ME])
476 * ME and MSAE should always be set.
477 * Interrupt Disable (PCIE*_CFG001[I_DIS])
478 * System Error Message Enable (PCIE*_CFG001[SEE])
479 */
480 pciercx_cfg001.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG001(pcie_port));
481 pciercx_cfg001.s.msae = 1; /* Memory space enable. */
482 pciercx_cfg001.s.me = 1; /* Bus master enable. */
483 pciercx_cfg001.s.i_dis = 1; /* INTx assertion disable. */
484 pciercx_cfg001.s.see = 1; /* SERR# enable */
485 cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG001(pcie_port), pciercx_cfg001.u32);
486
487 /* Advanced Error Recovery Message Enables */
488 /* (PCIE*_CFG066,PCIE*_CFG067,PCIE*_CFG069) */
489 cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG066(pcie_port), 0);
490 /* Use CVMX_PCIERCX_CFG067 hardware default */
491 cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG069(pcie_port), 0);
492
493
494 /* Active State Power Management (PCIE*_CFG032[ASLPC]) */
495 pciercx_cfg032.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG032(pcie_port));
496 pciercx_cfg032.s.aslpc = 0; /* Active state Link PM control. */
497 cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG032(pcie_port), pciercx_cfg032.u32);
498
499 /*
500 * Link Width Mode (PCIERCn_CFG452[LME]) - Set during
501 * cvmx_pcie_rc_initialize_link()
502 *
503 * Primary Bus Number (PCIERCn_CFG006[PBNUM])
504 *
505 * We set the primary bus number to 1 so IDT bridges are
506 * happy. They don't like zero.
507 */
508 pciercx_cfg006.u32 = 0;
509 pciercx_cfg006.s.pbnum = 1;
510 pciercx_cfg006.s.sbnum = 1;
511 pciercx_cfg006.s.subbnum = 1;
512 cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG006(pcie_port), pciercx_cfg006.u32);
513
514
515 /*
516 * Memory-mapped I/O BAR (PCIERCn_CFG008)
517 * Most applications should disable the memory-mapped I/O BAR by
518 * setting PCIERCn_CFG008[ML_ADDR] < PCIERCn_CFG008[MB_ADDR]
519 */
520 pciercx_cfg008.u32 = 0;
521 pciercx_cfg008.s.mb_addr = 0x100;
522 pciercx_cfg008.s.ml_addr = 0;
523 cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG008(pcie_port), pciercx_cfg008.u32);
524
525
526 /*
527 * Prefetchable BAR (PCIERCn_CFG009,PCIERCn_CFG010,PCIERCn_CFG011)
528 * Most applications should disable the prefetchable BAR by setting
529 * PCIERCn_CFG011[UMEM_LIMIT],PCIERCn_CFG009[LMEM_LIMIT] <
530 * PCIERCn_CFG010[UMEM_BASE],PCIERCn_CFG009[LMEM_BASE]
531 */
532 pciercx_cfg009.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG009(pcie_port));
533 pciercx_cfg010.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG010(pcie_port));
534 pciercx_cfg011.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG011(pcie_port));
535 pciercx_cfg009.s.lmem_base = 0x100;
536 pciercx_cfg009.s.lmem_limit = 0;
537 pciercx_cfg010.s.umem_base = 0x100;
538 pciercx_cfg011.s.umem_limit = 0;
539 cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG009(pcie_port), pciercx_cfg009.u32);
540 cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG010(pcie_port), pciercx_cfg010.u32);
541 cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG011(pcie_port), pciercx_cfg011.u32);
542
543 /*
544 * System Error Interrupt Enables (PCIERCn_CFG035[SECEE,SEFEE,SENFEE])
545 * PME Interrupt Enables (PCIERCn_CFG035[PMEIE])
546 */
547 pciercx_cfg035.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG035(pcie_port));
548 pciercx_cfg035.s.secee = 1; /* System error on correctable error enable. */
549 pciercx_cfg035.s.sefee = 1; /* System error on fatal error enable. */
550 pciercx_cfg035.s.senfee = 1; /* System error on non-fatal error enable. */
551 pciercx_cfg035.s.pmeie = 1; /* PME interrupt enable. */
552 cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG035(pcie_port), pciercx_cfg035.u32);
553
554 /*
555 * Advanced Error Recovery Interrupt Enables
556 * (PCIERCn_CFG075[CERE,NFERE,FERE])
557 */
558 pciercx_cfg075.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG075(pcie_port));
559 pciercx_cfg075.s.cere = 1; /* Correctable error reporting enable. */
560 pciercx_cfg075.s.nfere = 1; /* Non-fatal error reporting enable. */
561 pciercx_cfg075.s.fere = 1; /* Fatal error reporting enable. */
562 cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG075(pcie_port), pciercx_cfg075.u32);
563
564 /*
565 * HP Interrupt Enables (PCIERCn_CFG034[HPINT_EN],
566 * PCIERCn_CFG034[DLLS_EN,CCINT_EN])
567 */
568 pciercx_cfg034.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG034(pcie_port));
569 pciercx_cfg034.s.hpint_en = 1; /* Hot-plug interrupt enable. */
570 pciercx_cfg034.s.dlls_en = 1; /* Data Link Layer state changed enable */
571 pciercx_cfg034.s.ccint_en = 1; /* Command completed interrupt enable. */
572 cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG034(pcie_port), pciercx_cfg034.u32);
573 }
574
575 /**
576 * Initialize a host mode PCIe gen 1 link. This function takes a PCIe
577 * port from reset to a link up state. Software can then begin
578 * configuring the rest of the link.
579 *
580 * @pcie_port: PCIe port to initialize
581 *
582 * Returns Zero on success
583 */
__cvmx_pcie_rc_initialize_link_gen1(int pcie_port)584 static int __cvmx_pcie_rc_initialize_link_gen1(int pcie_port)
585 {
586 uint64_t start_cycle;
587 union cvmx_pescx_ctl_status pescx_ctl_status;
588 union cvmx_pciercx_cfg452 pciercx_cfg452;
589 union cvmx_pciercx_cfg032 pciercx_cfg032;
590 union cvmx_pciercx_cfg448 pciercx_cfg448;
591
592 /* Set the lane width */
593 pciercx_cfg452.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG452(pcie_port));
594 pescx_ctl_status.u64 = cvmx_read_csr(CVMX_PESCX_CTL_STATUS(pcie_port));
595 if (pescx_ctl_status.s.qlm_cfg == 0)
596 /* We're in 8 lane (56XX) or 4 lane (54XX) mode */
597 pciercx_cfg452.s.lme = 0xf;
598 else
599 /* We're in 4 lane (56XX) or 2 lane (52XX) mode */
600 pciercx_cfg452.s.lme = 0x7;
601 cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG452(pcie_port), pciercx_cfg452.u32);
602
603 /*
604 * CN52XX pass 1.x has an errata where length mismatches on UR
605 * responses can cause bus errors on 64bit memory
606 * reads. Turning off length error checking fixes this.
607 */
608 if (OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X)) {
609 union cvmx_pciercx_cfg455 pciercx_cfg455;
610 pciercx_cfg455.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG455(pcie_port));
611 pciercx_cfg455.s.m_cpl_len_err = 1;
612 cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG455(pcie_port), pciercx_cfg455.u32);
613 }
614
615 /* Lane swap needs to be manually enabled for CN52XX */
616 if (OCTEON_IS_MODEL(OCTEON_CN52XX) && (pcie_port == 1)) {
617 pescx_ctl_status.s.lane_swp = 1;
618 cvmx_write_csr(CVMX_PESCX_CTL_STATUS(pcie_port), pescx_ctl_status.u64);
619 }
620
621 /* Bring up the link */
622 pescx_ctl_status.u64 = cvmx_read_csr(CVMX_PESCX_CTL_STATUS(pcie_port));
623 pescx_ctl_status.s.lnk_enb = 1;
624 cvmx_write_csr(CVMX_PESCX_CTL_STATUS(pcie_port), pescx_ctl_status.u64);
625
626 /*
627 * CN52XX pass 1.0: Due to a bug in 2nd order CDR, it needs to
628 * be disabled.
629 */
630 if (OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_0))
631 __cvmx_helper_errata_qlm_disable_2nd_order_cdr(0);
632
633 /* Wait for the link to come up */
634 start_cycle = cvmx_get_cycle();
635 do {
636 if (cvmx_get_cycle() - start_cycle > 2 * octeon_get_clock_rate()) {
637 cvmx_dprintf("PCIe: Port %d link timeout\n", pcie_port);
638 return -1;
639 }
640 __delay(10000);
641 pciercx_cfg032.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG032(pcie_port));
642 } while (pciercx_cfg032.s.dlla == 0);
643
644 /* Clear all pending errors */
645 cvmx_write_csr(CVMX_PEXP_NPEI_INT_SUM, cvmx_read_csr(CVMX_PEXP_NPEI_INT_SUM));
646
647 /*
648 * Update the Replay Time Limit. Empirically, some PCIe
649 * devices take a little longer to respond than expected under
650 * load. As a workaround for this we configure the Replay Time
651 * Limit to the value expected for a 512 byte MPS instead of
652 * our actual 256 byte MPS. The numbers below are directly
653 * from the PCIe spec table 3-4.
654 */
655 pciercx_cfg448.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG448(pcie_port));
656 switch (pciercx_cfg032.s.nlw) {
657 case 1: /* 1 lane */
658 pciercx_cfg448.s.rtl = 1677;
659 break;
660 case 2: /* 2 lanes */
661 pciercx_cfg448.s.rtl = 867;
662 break;
663 case 4: /* 4 lanes */
664 pciercx_cfg448.s.rtl = 462;
665 break;
666 case 8: /* 8 lanes */
667 pciercx_cfg448.s.rtl = 258;
668 break;
669 }
670 cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG448(pcie_port), pciercx_cfg448.u32);
671
672 return 0;
673 }
674
__cvmx_increment_ba(union cvmx_sli_mem_access_subidx * pmas)675 static void __cvmx_increment_ba(union cvmx_sli_mem_access_subidx *pmas)
676 {
677 if (OCTEON_IS_MODEL(OCTEON_CN68XX))
678 pmas->cn68xx.ba++;
679 else
680 pmas->s.ba++;
681 }
682
683 /**
684 * Initialize a PCIe gen 1 port for use in host(RC) mode. It doesn't
685 * enumerate the bus.
686 *
687 * @pcie_port: PCIe port to initialize
688 *
689 * Returns Zero on success
690 */
__cvmx_pcie_rc_initialize_gen1(int pcie_port)691 static int __cvmx_pcie_rc_initialize_gen1(int pcie_port)
692 {
693 int i;
694 int base;
695 u64 addr_swizzle;
696 union cvmx_ciu_soft_prst ciu_soft_prst;
697 union cvmx_pescx_bist_status pescx_bist_status;
698 union cvmx_pescx_bist_status2 pescx_bist_status2;
699 union cvmx_npei_ctl_status npei_ctl_status;
700 union cvmx_npei_mem_access_ctl npei_mem_access_ctl;
701 union cvmx_npei_mem_access_subidx mem_access_subid;
702 union cvmx_npei_dbg_data npei_dbg_data;
703 union cvmx_pescx_ctl_status2 pescx_ctl_status2;
704 union cvmx_pciercx_cfg032 pciercx_cfg032;
705 union cvmx_npei_bar1_indexx bar1_index;
706
707 retry:
708 /*
709 * Make sure we aren't trying to setup a target mode interface
710 * in host mode.
711 */
712 npei_ctl_status.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_CTL_STATUS);
713 if ((pcie_port == 0) && !npei_ctl_status.s.host_mode) {
714 cvmx_dprintf("PCIe: Port %d in endpoint mode\n", pcie_port);
715 return -1;
716 }
717
718 /*
719 * Make sure a CN52XX isn't trying to bring up port 1 when it
720 * is disabled.
721 */
722 if (OCTEON_IS_MODEL(OCTEON_CN52XX)) {
723 npei_dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA);
724 if ((pcie_port == 1) && npei_dbg_data.cn52xx.qlm0_link_width) {
725 cvmx_dprintf("PCIe: ERROR: cvmx_pcie_rc_initialize() called on port1, but port1 is disabled\n");
726 return -1;
727 }
728 }
729
730 /*
731 * PCIe switch arbitration mode. '0' == fixed priority NPEI,
732 * PCIe0, then PCIe1. '1' == round robin.
733 */
734 npei_ctl_status.s.arb = 1;
735 /* Allow up to 0x20 config retries */
736 npei_ctl_status.s.cfg_rtry = 0x20;
737 /*
738 * CN52XX pass1.x has an errata where P0_NTAGS and P1_NTAGS
739 * don't reset.
740 */
741 if (OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X)) {
742 npei_ctl_status.s.p0_ntags = 0x20;
743 npei_ctl_status.s.p1_ntags = 0x20;
744 }
745 cvmx_write_csr(CVMX_PEXP_NPEI_CTL_STATUS, npei_ctl_status.u64);
746
747 /* Bring the PCIe out of reset */
748 if (cvmx_sysinfo_get()->board_type == CVMX_BOARD_TYPE_EBH5200) {
749 /*
750 * The EBH5200 board swapped the PCIe reset lines on
751 * the board. As a workaround for this bug, we bring
752 * both PCIe ports out of reset at the same time
753 * instead of on separate calls. So for port 0, we
754 * bring both out of reset and do nothing on port 1
755 */
756 if (pcie_port == 0) {
757 ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST);
758 /*
759 * After a chip reset the PCIe will also be in
760 * reset. If it isn't, most likely someone is
761 * trying to init it again without a proper
762 * PCIe reset.
763 */
764 if (ciu_soft_prst.s.soft_prst == 0) {
765 /* Reset the ports */
766 ciu_soft_prst.s.soft_prst = 1;
767 cvmx_write_csr(CVMX_CIU_SOFT_PRST, ciu_soft_prst.u64);
768 ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST1);
769 ciu_soft_prst.s.soft_prst = 1;
770 cvmx_write_csr(CVMX_CIU_SOFT_PRST1, ciu_soft_prst.u64);
771 /* Wait until pcie resets the ports. */
772 udelay(2000);
773 }
774 ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST1);
775 ciu_soft_prst.s.soft_prst = 0;
776 cvmx_write_csr(CVMX_CIU_SOFT_PRST1, ciu_soft_prst.u64);
777 ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST);
778 ciu_soft_prst.s.soft_prst = 0;
779 cvmx_write_csr(CVMX_CIU_SOFT_PRST, ciu_soft_prst.u64);
780 }
781 } else {
782 /*
783 * The normal case: The PCIe ports are completely
784 * separate and can be brought out of reset
785 * independently.
786 */
787 if (pcie_port)
788 ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST1);
789 else
790 ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST);
791 /*
792 * After a chip reset the PCIe will also be in
793 * reset. If it isn't, most likely someone is trying
794 * to init it again without a proper PCIe reset.
795 */
796 if (ciu_soft_prst.s.soft_prst == 0) {
797 /* Reset the port */
798 ciu_soft_prst.s.soft_prst = 1;
799 if (pcie_port)
800 cvmx_write_csr(CVMX_CIU_SOFT_PRST1, ciu_soft_prst.u64);
801 else
802 cvmx_write_csr(CVMX_CIU_SOFT_PRST, ciu_soft_prst.u64);
803 /* Wait until pcie resets the ports. */
804 udelay(2000);
805 }
806 if (pcie_port) {
807 ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST1);
808 ciu_soft_prst.s.soft_prst = 0;
809 cvmx_write_csr(CVMX_CIU_SOFT_PRST1, ciu_soft_prst.u64);
810 } else {
811 ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST);
812 ciu_soft_prst.s.soft_prst = 0;
813 cvmx_write_csr(CVMX_CIU_SOFT_PRST, ciu_soft_prst.u64);
814 }
815 }
816
817 /*
818 * Wait for PCIe reset to complete. Due to errata PCIE-700, we
819 * don't poll PESCX_CTL_STATUS2[PCIERST], but simply wait a
820 * fixed number of cycles.
821 */
822 __delay(400000);
823
824 /*
825 * PESCX_BIST_STATUS2[PCLK_RUN] was missing on pass 1 of
826 * CN56XX and CN52XX, so we only probe it on newer chips
827 */
828 if (!OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_X) && !OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X)) {
829 /* Clear PCLK_RUN so we can check if the clock is running */
830 pescx_ctl_status2.u64 = cvmx_read_csr(CVMX_PESCX_CTL_STATUS2(pcie_port));
831 pescx_ctl_status2.s.pclk_run = 1;
832 cvmx_write_csr(CVMX_PESCX_CTL_STATUS2(pcie_port), pescx_ctl_status2.u64);
833 /* Now that we cleared PCLK_RUN, wait for it to be set
834 * again telling us the clock is running
835 */
836 if (CVMX_WAIT_FOR_FIELD64(CVMX_PESCX_CTL_STATUS2(pcie_port),
837 union cvmx_pescx_ctl_status2, pclk_run, ==, 1, 10000)) {
838 cvmx_dprintf("PCIe: Port %d isn't clocked, skipping.\n", pcie_port);
839 return -1;
840 }
841 }
842
843 /*
844 * Check and make sure PCIe came out of reset. If it doesn't
845 * the board probably hasn't wired the clocks up and the
846 * interface should be skipped.
847 */
848 pescx_ctl_status2.u64 = cvmx_read_csr(CVMX_PESCX_CTL_STATUS2(pcie_port));
849 if (pescx_ctl_status2.s.pcierst) {
850 cvmx_dprintf("PCIe: Port %d stuck in reset, skipping.\n", pcie_port);
851 return -1;
852 }
853
854 /*
855 * Check BIST2 status. If any bits are set skip this
856 * interface. This is an attempt to catch PCIE-813 on pass 1
857 * parts.
858 */
859 pescx_bist_status2.u64 = cvmx_read_csr(CVMX_PESCX_BIST_STATUS2(pcie_port));
860 if (pescx_bist_status2.u64) {
861 cvmx_dprintf("PCIe: Port %d BIST2 failed. Most likely this port isn't hooked up, skipping.\n",
862 pcie_port);
863 return -1;
864 }
865
866 /* Check BIST status */
867 pescx_bist_status.u64 = cvmx_read_csr(CVMX_PESCX_BIST_STATUS(pcie_port));
868 if (pescx_bist_status.u64)
869 cvmx_dprintf("PCIe: BIST FAILED for port %d (0x%016llx)\n",
870 pcie_port, CAST64(pescx_bist_status.u64));
871
872 /* Initialize the config space CSRs */
873 __cvmx_pcie_rc_initialize_config_space(pcie_port);
874
875 /* Bring the link up */
876 if (__cvmx_pcie_rc_initialize_link_gen1(pcie_port)) {
877 cvmx_dprintf("PCIe: Failed to initialize port %d, probably the slot is empty\n",
878 pcie_port);
879 return -1;
880 }
881
882 /* Store merge control (NPEI_MEM_ACCESS_CTL[TIMER,MAX_WORD]) */
883 npei_mem_access_ctl.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_MEM_ACCESS_CTL);
884 npei_mem_access_ctl.s.max_word = 0; /* Allow 16 words to combine */
885 npei_mem_access_ctl.s.timer = 127; /* Wait up to 127 cycles for more data */
886 cvmx_write_csr(CVMX_PEXP_NPEI_MEM_ACCESS_CTL, npei_mem_access_ctl.u64);
887
888 /* Setup Mem access SubDIDs */
889 mem_access_subid.u64 = 0;
890 mem_access_subid.s.port = pcie_port; /* Port the request is sent to. */
891 mem_access_subid.s.nmerge = 1; /* Due to an errata on pass 1 chips, no merging is allowed. */
892 mem_access_subid.s.esr = 1; /* Endian-swap for Reads. */
893 mem_access_subid.s.esw = 1; /* Endian-swap for Writes. */
894 mem_access_subid.s.nsr = 0; /* Enable Snooping for Reads. Octeon doesn't care, but devices might want this more conservative setting */
895 mem_access_subid.s.nsw = 0; /* Enable Snoop for Writes. */
896 mem_access_subid.s.ror = 0; /* Disable Relaxed Ordering for Reads. */
897 mem_access_subid.s.row = 0; /* Disable Relaxed Ordering for Writes. */
898 mem_access_subid.s.ba = 0; /* PCIe Adddress Bits <63:34>. */
899
900 /*
901 * Setup mem access 12-15 for port 0, 16-19 for port 1,
902 * supplying 36 bits of address space.
903 */
904 for (i = 12 + pcie_port * 4; i < 16 + pcie_port * 4; i++) {
905 cvmx_write_csr(CVMX_PEXP_NPEI_MEM_ACCESS_SUBIDX(i), mem_access_subid.u64);
906 mem_access_subid.s.ba += 1; /* Set each SUBID to extend the addressable range */
907 }
908
909 /*
910 * Disable the peer to peer forwarding register. This must be
911 * setup by the OS after it enumerates the bus and assigns
912 * addresses to the PCIe busses.
913 */
914 for (i = 0; i < 4; i++) {
915 cvmx_write_csr(CVMX_PESCX_P2P_BARX_START(i, pcie_port), -1);
916 cvmx_write_csr(CVMX_PESCX_P2P_BARX_END(i, pcie_port), -1);
917 }
918
919 /* Set Octeon's BAR0 to decode 0-16KB. It overlaps with Bar2 */
920 cvmx_write_csr(CVMX_PESCX_P2N_BAR0_START(pcie_port), 0);
921
922 /* BAR1 follows BAR2 with a gap so it has the same address as for gen2. */
923 cvmx_write_csr(CVMX_PESCX_P2N_BAR1_START(pcie_port), CVMX_PCIE_BAR1_RC_BASE);
924
925 bar1_index.u32 = 0;
926 bar1_index.s.addr_idx = (CVMX_PCIE_BAR1_PHYS_BASE >> 22);
927 bar1_index.s.ca = 1; /* Not Cached */
928 bar1_index.s.end_swp = 1; /* Endian Swap mode */
929 bar1_index.s.addr_v = 1; /* Valid entry */
930
931 base = pcie_port ? 16 : 0;
932
933 /* Big endian swizzle for 32-bit PEXP_NCB register. */
934 #ifdef __MIPSEB__
935 addr_swizzle = 4;
936 #else
937 addr_swizzle = 0;
938 #endif
939 for (i = 0; i < 16; i++) {
940 cvmx_write64_uint32((CVMX_PEXP_NPEI_BAR1_INDEXX(base) ^ addr_swizzle),
941 bar1_index.u32);
942 base++;
943 /* 256MB / 16 >> 22 == 4 */
944 bar1_index.s.addr_idx += (((1ull << 28) / 16ull) >> 22);
945 }
946
947 /*
948 * Set Octeon's BAR2 to decode 0-2^39. Bar0 and Bar1 take
949 * precedence where they overlap. It also overlaps with the
950 * device addresses, so make sure the peer to peer forwarding
951 * is set right.
952 */
953 cvmx_write_csr(CVMX_PESCX_P2N_BAR2_START(pcie_port), 0);
954
955 /*
956 * Setup BAR2 attributes
957 *
958 * Relaxed Ordering (NPEI_CTL_PORTn[PTLP_RO,CTLP_RO, WAIT_COM])
959 * - PTLP_RO,CTLP_RO should normally be set (except for debug).
960 * - WAIT_COM=0 will likely work for all applications.
961 *
962 * Load completion relaxed ordering (NPEI_CTL_PORTn[WAITL_COM]).
963 */
964 if (pcie_port) {
965 union cvmx_npei_ctl_port1 npei_ctl_port;
966 npei_ctl_port.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_CTL_PORT1);
967 npei_ctl_port.s.bar2_enb = 1;
968 npei_ctl_port.s.bar2_esx = 1;
969 npei_ctl_port.s.bar2_cax = 0;
970 npei_ctl_port.s.ptlp_ro = 1;
971 npei_ctl_port.s.ctlp_ro = 1;
972 npei_ctl_port.s.wait_com = 0;
973 npei_ctl_port.s.waitl_com = 0;
974 cvmx_write_csr(CVMX_PEXP_NPEI_CTL_PORT1, npei_ctl_port.u64);
975 } else {
976 union cvmx_npei_ctl_port0 npei_ctl_port;
977 npei_ctl_port.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_CTL_PORT0);
978 npei_ctl_port.s.bar2_enb = 1;
979 npei_ctl_port.s.bar2_esx = 1;
980 npei_ctl_port.s.bar2_cax = 0;
981 npei_ctl_port.s.ptlp_ro = 1;
982 npei_ctl_port.s.ctlp_ro = 1;
983 npei_ctl_port.s.wait_com = 0;
984 npei_ctl_port.s.waitl_com = 0;
985 cvmx_write_csr(CVMX_PEXP_NPEI_CTL_PORT0, npei_ctl_port.u64);
986 }
987
988 /*
989 * Both pass 1 and pass 2 of CN52XX and CN56XX have an errata
990 * that causes TLP ordering to not be preserved after multiple
991 * PCIe port resets. This code detects this fault and corrects
992 * it by aligning the TLP counters properly. Another link
993 * reset is then performed. See PCIE-13340
994 */
995 if (OCTEON_IS_MODEL(OCTEON_CN56XX_PASS2_X) ||
996 OCTEON_IS_MODEL(OCTEON_CN52XX_PASS2_X) ||
997 OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_X) ||
998 OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X)) {
999 union cvmx_npei_dbg_data dbg_data;
1000 int old_in_fif_p_count;
1001 int in_fif_p_count;
1002 int out_p_count;
1003 int in_p_offset = (OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X) || OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_X)) ? 4 : 1;
1004 int i;
1005
1006 /*
1007 * Choose a write address of 1MB. It should be
1008 * harmless as all bars haven't been setup.
1009 */
1010 uint64_t write_address = (cvmx_pcie_get_mem_base_address(pcie_port) + 0x100000) | (1ull<<63);
1011
1012 /*
1013 * Make sure at least in_p_offset have been executed before we try and
1014 * read in_fif_p_count
1015 */
1016 i = in_p_offset;
1017 while (i--) {
1018 cvmx_write64_uint32(write_address, 0);
1019 __delay(10000);
1020 }
1021
1022 /*
1023 * Read the IN_FIF_P_COUNT from the debug
1024 * select. IN_FIF_P_COUNT can be unstable sometimes so
1025 * read it twice with a write between the reads. This
1026 * way we can tell the value is good as it will
1027 * increment by one due to the write
1028 */
1029 cvmx_write_csr(CVMX_PEXP_NPEI_DBG_SELECT, (pcie_port) ? 0xd7fc : 0xcffc);
1030 cvmx_read_csr(CVMX_PEXP_NPEI_DBG_SELECT);
1031 do {
1032 dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA);
1033 old_in_fif_p_count = dbg_data.s.data & 0xff;
1034 cvmx_write64_uint32(write_address, 0);
1035 __delay(10000);
1036 dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA);
1037 in_fif_p_count = dbg_data.s.data & 0xff;
1038 } while (in_fif_p_count != ((old_in_fif_p_count+1) & 0xff));
1039
1040 /* Update in_fif_p_count for it's offset with respect to out_p_count */
1041 in_fif_p_count = (in_fif_p_count + in_p_offset) & 0xff;
1042
1043 /* Read the OUT_P_COUNT from the debug select */
1044 cvmx_write_csr(CVMX_PEXP_NPEI_DBG_SELECT, (pcie_port) ? 0xd00f : 0xc80f);
1045 cvmx_read_csr(CVMX_PEXP_NPEI_DBG_SELECT);
1046 dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA);
1047 out_p_count = (dbg_data.s.data>>1) & 0xff;
1048
1049 /* Check that the two counters are aligned */
1050 if (out_p_count != in_fif_p_count) {
1051 cvmx_dprintf("PCIe: Port %d aligning TLP counters as workaround to maintain ordering\n", pcie_port);
1052 while (in_fif_p_count != 0) {
1053 cvmx_write64_uint32(write_address, 0);
1054 __delay(10000);
1055 in_fif_p_count = (in_fif_p_count + 1) & 0xff;
1056 }
1057 /*
1058 * The EBH5200 board swapped the PCIe reset
1059 * lines on the board. This means we must
1060 * bring both links down and up, which will
1061 * cause the PCIe0 to need alignment
1062 * again. Lots of messages will be displayed,
1063 * but everything should work
1064 */
1065 if ((cvmx_sysinfo_get()->board_type == CVMX_BOARD_TYPE_EBH5200) &&
1066 (pcie_port == 1))
1067 cvmx_pcie_rc_initialize(0);
1068 /* Rety bringing this port up */
1069 goto retry;
1070 }
1071 }
1072
1073 /* Display the link status */
1074 pciercx_cfg032.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG032(pcie_port));
1075 cvmx_dprintf("PCIe: Port %d link active, %d lanes\n", pcie_port, pciercx_cfg032.s.nlw);
1076
1077 return 0;
1078 }
1079
1080 /**
1081 * Initialize a host mode PCIe gen 2 link. This function takes a PCIe
1082 * port from reset to a link up state. Software can then begin
1083 * configuring the rest of the link.
1084 *
1085 * @pcie_port: PCIe port to initialize
1086 *
1087 * Return Zero on success.
1088 */
__cvmx_pcie_rc_initialize_link_gen2(int pcie_port)1089 static int __cvmx_pcie_rc_initialize_link_gen2(int pcie_port)
1090 {
1091 uint64_t start_cycle;
1092 union cvmx_pemx_ctl_status pem_ctl_status;
1093 union cvmx_pciercx_cfg032 pciercx_cfg032;
1094 union cvmx_pciercx_cfg448 pciercx_cfg448;
1095
1096 /* Bring up the link */
1097 pem_ctl_status.u64 = cvmx_read_csr(CVMX_PEMX_CTL_STATUS(pcie_port));
1098 pem_ctl_status.s.lnk_enb = 1;
1099 cvmx_write_csr(CVMX_PEMX_CTL_STATUS(pcie_port), pem_ctl_status.u64);
1100
1101 /* Wait for the link to come up */
1102 start_cycle = cvmx_get_cycle();
1103 do {
1104 if (cvmx_get_cycle() - start_cycle > octeon_get_clock_rate())
1105 return -1;
1106 __delay(10000);
1107 pciercx_cfg032.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG032(pcie_port));
1108 } while ((pciercx_cfg032.s.dlla == 0) || (pciercx_cfg032.s.lt == 1));
1109
1110 /*
1111 * Update the Replay Time Limit. Empirically, some PCIe
1112 * devices take a little longer to respond than expected under
1113 * load. As a workaround for this we configure the Replay Time
1114 * Limit to the value expected for a 512 byte MPS instead of
1115 * our actual 256 byte MPS. The numbers below are directly
1116 * from the PCIe spec table 3-4
1117 */
1118 pciercx_cfg448.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG448(pcie_port));
1119 switch (pciercx_cfg032.s.nlw) {
1120 case 1: /* 1 lane */
1121 pciercx_cfg448.s.rtl = 1677;
1122 break;
1123 case 2: /* 2 lanes */
1124 pciercx_cfg448.s.rtl = 867;
1125 break;
1126 case 4: /* 4 lanes */
1127 pciercx_cfg448.s.rtl = 462;
1128 break;
1129 case 8: /* 8 lanes */
1130 pciercx_cfg448.s.rtl = 258;
1131 break;
1132 }
1133 cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG448(pcie_port), pciercx_cfg448.u32);
1134
1135 return 0;
1136 }
1137
1138
1139 /**
1140 * Initialize a PCIe gen 2 port for use in host(RC) mode. It doesn't enumerate
1141 * the bus.
1142 *
1143 * @pcie_port: PCIe port to initialize
1144 *
1145 * Returns Zero on success.
1146 */
__cvmx_pcie_rc_initialize_gen2(int pcie_port)1147 static int __cvmx_pcie_rc_initialize_gen2(int pcie_port)
1148 {
1149 int i;
1150 union cvmx_ciu_soft_prst ciu_soft_prst;
1151 union cvmx_mio_rst_ctlx mio_rst_ctl;
1152 union cvmx_pemx_bar_ctl pemx_bar_ctl;
1153 union cvmx_pemx_ctl_status pemx_ctl_status;
1154 union cvmx_pemx_bist_status pemx_bist_status;
1155 union cvmx_pemx_bist_status2 pemx_bist_status2;
1156 union cvmx_pciercx_cfg032 pciercx_cfg032;
1157 union cvmx_pciercx_cfg515 pciercx_cfg515;
1158 union cvmx_sli_ctl_portx sli_ctl_portx;
1159 union cvmx_sli_mem_access_ctl sli_mem_access_ctl;
1160 union cvmx_sli_mem_access_subidx mem_access_subid;
1161 union cvmx_sriox_status_reg sriox_status_reg;
1162 union cvmx_pemx_bar1_indexx bar1_index;
1163
1164 if (octeon_has_feature(OCTEON_FEATURE_SRIO)) {
1165 /* Make sure this interface isn't SRIO */
1166 if (OCTEON_IS_MODEL(OCTEON_CN66XX)) {
1167 /*
1168 * The CN66XX requires reading the
1169 * MIO_QLMX_CFG register to figure out the
1170 * port type.
1171 */
1172 union cvmx_mio_qlmx_cfg qlmx_cfg;
1173 qlmx_cfg.u64 = cvmx_read_csr(CVMX_MIO_QLMX_CFG(pcie_port));
1174
1175 if (qlmx_cfg.s.qlm_spd == 15) {
1176 pr_notice("PCIe: Port %d is disabled, skipping.\n", pcie_port);
1177 return -1;
1178 }
1179
1180 switch (qlmx_cfg.s.qlm_spd) {
1181 case 0x1: /* SRIO 1x4 short */
1182 case 0x3: /* SRIO 1x4 long */
1183 case 0x4: /* SRIO 2x2 short */
1184 case 0x6: /* SRIO 2x2 long */
1185 pr_notice("PCIe: Port %d is SRIO, skipping.\n", pcie_port);
1186 return -1;
1187 case 0x9: /* SGMII */
1188 pr_notice("PCIe: Port %d is SGMII, skipping.\n", pcie_port);
1189 return -1;
1190 case 0xb: /* XAUI */
1191 pr_notice("PCIe: Port %d is XAUI, skipping.\n", pcie_port);
1192 return -1;
1193 case 0x0: /* PCIE gen2 */
1194 case 0x8: /* PCIE gen2 (alias) */
1195 case 0x2: /* PCIE gen1 */
1196 case 0xa: /* PCIE gen1 (alias) */
1197 break;
1198 default:
1199 pr_notice("PCIe: Port %d is unknown, skipping.\n", pcie_port);
1200 return -1;
1201 }
1202 } else {
1203 sriox_status_reg.u64 = cvmx_read_csr(CVMX_SRIOX_STATUS_REG(pcie_port));
1204 if (sriox_status_reg.s.srio) {
1205 pr_notice("PCIe: Port %d is SRIO, skipping.\n", pcie_port);
1206 return -1;
1207 }
1208 }
1209 }
1210
1211 #if 0
1212 /* This code is so that the PCIe analyzer is able to see 63XX traffic */
1213 pr_notice("PCIE : init for pcie analyzer.\n");
1214 cvmx_helper_qlm_jtag_init();
1215 cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 85);
1216 cvmx_helper_qlm_jtag_shift(pcie_port, 1, 1);
1217 cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 300-86);
1218 cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 85);
1219 cvmx_helper_qlm_jtag_shift(pcie_port, 1, 1);
1220 cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 300-86);
1221 cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 85);
1222 cvmx_helper_qlm_jtag_shift(pcie_port, 1, 1);
1223 cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 300-86);
1224 cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 85);
1225 cvmx_helper_qlm_jtag_shift(pcie_port, 1, 1);
1226 cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 300-86);
1227 cvmx_helper_qlm_jtag_update(pcie_port);
1228 #endif
1229
1230 /* Make sure we aren't trying to setup a target mode interface in host mode */
1231 mio_rst_ctl.u64 = cvmx_read_csr(CVMX_MIO_RST_CTLX(pcie_port));
1232 if (!mio_rst_ctl.s.host_mode) {
1233 pr_notice("PCIe: Port %d in endpoint mode.\n", pcie_port);
1234 return -1;
1235 }
1236
1237 /* CN63XX Pass 1.0 errata G-14395 requires the QLM De-emphasis be programmed */
1238 if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_0)) {
1239 if (pcie_port) {
1240 union cvmx_ciu_qlm ciu_qlm;
1241 ciu_qlm.u64 = cvmx_read_csr(CVMX_CIU_QLM1);
1242 ciu_qlm.s.txbypass = 1;
1243 ciu_qlm.s.txdeemph = 5;
1244 ciu_qlm.s.txmargin = 0x17;
1245 cvmx_write_csr(CVMX_CIU_QLM1, ciu_qlm.u64);
1246 } else {
1247 union cvmx_ciu_qlm ciu_qlm;
1248 ciu_qlm.u64 = cvmx_read_csr(CVMX_CIU_QLM0);
1249 ciu_qlm.s.txbypass = 1;
1250 ciu_qlm.s.txdeemph = 5;
1251 ciu_qlm.s.txmargin = 0x17;
1252 cvmx_write_csr(CVMX_CIU_QLM0, ciu_qlm.u64);
1253 }
1254 }
1255 /* Bring the PCIe out of reset */
1256 if (pcie_port)
1257 ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST1);
1258 else
1259 ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST);
1260 /*
1261 * After a chip reset the PCIe will also be in reset. If it
1262 * isn't, most likely someone is trying to init it again
1263 * without a proper PCIe reset
1264 */
1265 if (ciu_soft_prst.s.soft_prst == 0) {
1266 /* Reset the port */
1267 ciu_soft_prst.s.soft_prst = 1;
1268 if (pcie_port)
1269 cvmx_write_csr(CVMX_CIU_SOFT_PRST1, ciu_soft_prst.u64);
1270 else
1271 cvmx_write_csr(CVMX_CIU_SOFT_PRST, ciu_soft_prst.u64);
1272 /* Wait until pcie resets the ports. */
1273 udelay(2000);
1274 }
1275 if (pcie_port) {
1276 ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST1);
1277 ciu_soft_prst.s.soft_prst = 0;
1278 cvmx_write_csr(CVMX_CIU_SOFT_PRST1, ciu_soft_prst.u64);
1279 } else {
1280 ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST);
1281 ciu_soft_prst.s.soft_prst = 0;
1282 cvmx_write_csr(CVMX_CIU_SOFT_PRST, ciu_soft_prst.u64);
1283 }
1284
1285 /* Wait for PCIe reset to complete */
1286 udelay(1000);
1287
1288 /*
1289 * Check and make sure PCIe came out of reset. If it doesn't
1290 * the board probably hasn't wired the clocks up and the
1291 * interface should be skipped.
1292 */
1293 if (CVMX_WAIT_FOR_FIELD64(CVMX_MIO_RST_CTLX(pcie_port), union cvmx_mio_rst_ctlx, rst_done, ==, 1, 10000)) {
1294 pr_notice("PCIe: Port %d stuck in reset, skipping.\n", pcie_port);
1295 return -1;
1296 }
1297
1298 /* Check BIST status */
1299 pemx_bist_status.u64 = cvmx_read_csr(CVMX_PEMX_BIST_STATUS(pcie_port));
1300 if (pemx_bist_status.u64)
1301 pr_notice("PCIe: BIST FAILED for port %d (0x%016llx)\n", pcie_port, CAST64(pemx_bist_status.u64));
1302 pemx_bist_status2.u64 = cvmx_read_csr(CVMX_PEMX_BIST_STATUS2(pcie_port));
1303 /* Errata PCIE-14766 may cause the lower 6 bits to be randomly set on CN63XXp1 */
1304 if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X))
1305 pemx_bist_status2.u64 &= ~0x3full;
1306 if (pemx_bist_status2.u64)
1307 pr_notice("PCIe: BIST2 FAILED for port %d (0x%016llx)\n", pcie_port, CAST64(pemx_bist_status2.u64));
1308
1309 /* Initialize the config space CSRs */
1310 __cvmx_pcie_rc_initialize_config_space(pcie_port);
1311
1312 /* Enable gen2 speed selection */
1313 pciercx_cfg515.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG515(pcie_port));
1314 pciercx_cfg515.s.dsc = 1;
1315 cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG515(pcie_port), pciercx_cfg515.u32);
1316
1317 /* Bring the link up */
1318 if (__cvmx_pcie_rc_initialize_link_gen2(pcie_port)) {
1319 /*
1320 * Some gen1 devices don't handle the gen 2 training
1321 * correctly. Disable gen2 and try again with only
1322 * gen1
1323 */
1324 union cvmx_pciercx_cfg031 pciercx_cfg031;
1325 pciercx_cfg031.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG031(pcie_port));
1326 pciercx_cfg031.s.mls = 1;
1327 cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG031(pcie_port), pciercx_cfg031.u32);
1328 if (__cvmx_pcie_rc_initialize_link_gen2(pcie_port)) {
1329 pr_notice("PCIe: Link timeout on port %d, probably the slot is empty\n", pcie_port);
1330 return -1;
1331 }
1332 }
1333
1334 /* Store merge control (SLI_MEM_ACCESS_CTL[TIMER,MAX_WORD]) */
1335 sli_mem_access_ctl.u64 = cvmx_read_csr(CVMX_PEXP_SLI_MEM_ACCESS_CTL);
1336 sli_mem_access_ctl.s.max_word = 0; /* Allow 16 words to combine */
1337 sli_mem_access_ctl.s.timer = 127; /* Wait up to 127 cycles for more data */
1338 cvmx_write_csr(CVMX_PEXP_SLI_MEM_ACCESS_CTL, sli_mem_access_ctl.u64);
1339
1340 /* Setup Mem access SubDIDs */
1341 mem_access_subid.u64 = 0;
1342 mem_access_subid.s.port = pcie_port; /* Port the request is sent to. */
1343 mem_access_subid.s.nmerge = 0; /* Allow merging as it works on CN6XXX. */
1344 mem_access_subid.s.esr = 1; /* Endian-swap for Reads. */
1345 mem_access_subid.s.esw = 1; /* Endian-swap for Writes. */
1346 mem_access_subid.s.wtype = 0; /* "No snoop" and "Relaxed ordering" are not set */
1347 mem_access_subid.s.rtype = 0; /* "No snoop" and "Relaxed ordering" are not set */
1348 /* PCIe Adddress Bits <63:34>. */
1349 if (OCTEON_IS_MODEL(OCTEON_CN68XX))
1350 mem_access_subid.cn68xx.ba = 0;
1351 else
1352 mem_access_subid.s.ba = 0;
1353
1354 /*
1355 * Setup mem access 12-15 for port 0, 16-19 for port 1,
1356 * supplying 36 bits of address space.
1357 */
1358 for (i = 12 + pcie_port * 4; i < 16 + pcie_port * 4; i++) {
1359 cvmx_write_csr(CVMX_PEXP_SLI_MEM_ACCESS_SUBIDX(i), mem_access_subid.u64);
1360 /* Set each SUBID to extend the addressable range */
1361 __cvmx_increment_ba(&mem_access_subid);
1362 }
1363
1364 /*
1365 * Disable the peer to peer forwarding register. This must be
1366 * setup by the OS after it enumerates the bus and assigns
1367 * addresses to the PCIe busses.
1368 */
1369 for (i = 0; i < 4; i++) {
1370 cvmx_write_csr(CVMX_PEMX_P2P_BARX_START(i, pcie_port), -1);
1371 cvmx_write_csr(CVMX_PEMX_P2P_BARX_END(i, pcie_port), -1);
1372 }
1373
1374 /* Set Octeon's BAR0 to decode 0-16KB. It overlaps with Bar2 */
1375 cvmx_write_csr(CVMX_PEMX_P2N_BAR0_START(pcie_port), 0);
1376
1377 /*
1378 * Set Octeon's BAR2 to decode 0-2^41. Bar0 and Bar1 take
1379 * precedence where they overlap. It also overlaps with the
1380 * device addresses, so make sure the peer to peer forwarding
1381 * is set right.
1382 */
1383 cvmx_write_csr(CVMX_PEMX_P2N_BAR2_START(pcie_port), 0);
1384
1385 /*
1386 * Setup BAR2 attributes
1387 * Relaxed Ordering (NPEI_CTL_PORTn[PTLP_RO,CTLP_RO, WAIT_COM])
1388 * - PTLP_RO,CTLP_RO should normally be set (except for debug).
1389 * - WAIT_COM=0 will likely work for all applications.
1390 * Load completion relaxed ordering (NPEI_CTL_PORTn[WAITL_COM])
1391 */
1392 pemx_bar_ctl.u64 = cvmx_read_csr(CVMX_PEMX_BAR_CTL(pcie_port));
1393 pemx_bar_ctl.s.bar1_siz = 3; /* 256MB BAR1*/
1394 pemx_bar_ctl.s.bar2_enb = 1;
1395 pemx_bar_ctl.s.bar2_esx = 1;
1396 pemx_bar_ctl.s.bar2_cax = 0;
1397 cvmx_write_csr(CVMX_PEMX_BAR_CTL(pcie_port), pemx_bar_ctl.u64);
1398 sli_ctl_portx.u64 = cvmx_read_csr(CVMX_PEXP_SLI_CTL_PORTX(pcie_port));
1399 sli_ctl_portx.s.ptlp_ro = 1;
1400 sli_ctl_portx.s.ctlp_ro = 1;
1401 sli_ctl_portx.s.wait_com = 0;
1402 sli_ctl_portx.s.waitl_com = 0;
1403 cvmx_write_csr(CVMX_PEXP_SLI_CTL_PORTX(pcie_port), sli_ctl_portx.u64);
1404
1405 /* BAR1 follows BAR2 */
1406 cvmx_write_csr(CVMX_PEMX_P2N_BAR1_START(pcie_port), CVMX_PCIE_BAR1_RC_BASE);
1407
1408 bar1_index.u64 = 0;
1409 bar1_index.s.addr_idx = (CVMX_PCIE_BAR1_PHYS_BASE >> 22);
1410 bar1_index.s.ca = 1; /* Not Cached */
1411 bar1_index.s.end_swp = 1; /* Endian Swap mode */
1412 bar1_index.s.addr_v = 1; /* Valid entry */
1413
1414 for (i = 0; i < 16; i++) {
1415 cvmx_write_csr(CVMX_PEMX_BAR1_INDEXX(i, pcie_port), bar1_index.u64);
1416 /* 256MB / 16 >> 22 == 4 */
1417 bar1_index.s.addr_idx += (((1ull << 28) / 16ull) >> 22);
1418 }
1419
1420 /*
1421 * Allow config retries for 250ms. Count is based off the 5Ghz
1422 * SERDES clock.
1423 */
1424 pemx_ctl_status.u64 = cvmx_read_csr(CVMX_PEMX_CTL_STATUS(pcie_port));
1425 pemx_ctl_status.s.cfg_rtry = 250 * 5000000 / 0x10000;
1426 cvmx_write_csr(CVMX_PEMX_CTL_STATUS(pcie_port), pemx_ctl_status.u64);
1427
1428 /* Display the link status */
1429 pciercx_cfg032.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG032(pcie_port));
1430 pr_notice("PCIe: Port %d link active, %d lanes, speed gen%d\n", pcie_port, pciercx_cfg032.s.nlw, pciercx_cfg032.s.ls);
1431
1432 return 0;
1433 }
1434
1435 /**
1436 * Initialize a PCIe port for use in host(RC) mode. It doesn't enumerate the bus.
1437 *
1438 * @pcie_port: PCIe port to initialize
1439 *
1440 * Returns Zero on success
1441 */
cvmx_pcie_rc_initialize(int pcie_port)1442 static int cvmx_pcie_rc_initialize(int pcie_port)
1443 {
1444 int result;
1445 if (octeon_has_feature(OCTEON_FEATURE_NPEI))
1446 result = __cvmx_pcie_rc_initialize_gen1(pcie_port);
1447 else
1448 result = __cvmx_pcie_rc_initialize_gen2(pcie_port);
1449 return result;
1450 }
1451
1452 /* Above was cvmx-pcie.c, below original pcie.c */
1453
1454 /**
1455 * Map a PCI device to the appropriate interrupt line
1456 *
1457 * @dev: The Linux PCI device structure for the device to map
1458 * @slot: The slot number for this device on __BUS 0__. Linux
1459 * enumerates through all the bridges and figures out the
1460 * slot on Bus 0 where this device eventually hooks to.
1461 * @pin: The PCI interrupt pin read from the device, then swizzled
1462 * as it goes through each bridge.
1463 * Returns Interrupt number for the device
1464 */
octeon_pcie_pcibios_map_irq(const struct pci_dev * dev,u8 slot,u8 pin)1465 int octeon_pcie_pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
1466 {
1467 /*
1468 * The EBH5600 board with the PCI to PCIe bridge mistakenly
1469 * wires the first slot for both device id 2 and interrupt
1470 * A. According to the PCI spec, device id 2 should be C. The
1471 * following kludge attempts to fix this.
1472 */
1473 if (strstr(octeon_board_type_string(), "EBH5600") &&
1474 dev->bus && dev->bus->parent) {
1475 /*
1476 * Iterate all the way up the device chain and find
1477 * the root bus.
1478 */
1479 while (dev->bus && dev->bus->parent)
1480 dev = to_pci_dev(dev->bus->bridge);
1481 /*
1482 * If the root bus is number 0 and the PEX 8114 is the
1483 * root, assume we are behind the miswired bus. We
1484 * need to correct the swizzle level by two. Yuck.
1485 */
1486 if ((dev->bus->number == 1) &&
1487 (dev->vendor == 0x10b5) && (dev->device == 0x8114)) {
1488 /*
1489 * The pin field is one based, not zero. We
1490 * need to swizzle it by minus two.
1491 */
1492 pin = ((pin - 3) & 3) + 1;
1493 }
1494 }
1495 /*
1496 * The -1 is because pin starts with one, not zero. It might
1497 * be that this equation needs to include the slot number, but
1498 * I don't have hardware to check that against.
1499 */
1500 return pin - 1 + OCTEON_IRQ_PCI_INT0;
1501 }
1502
set_cfg_read_retry(u32 retry_cnt)1503 static void set_cfg_read_retry(u32 retry_cnt)
1504 {
1505 union cvmx_pemx_ctl_status pemx_ctl;
1506 pemx_ctl.u64 = cvmx_read_csr(CVMX_PEMX_CTL_STATUS(1));
1507 pemx_ctl.s.cfg_rtry = retry_cnt;
1508 cvmx_write_csr(CVMX_PEMX_CTL_STATUS(1), pemx_ctl.u64);
1509 }
1510
1511
disable_cfg_read_retry(void)1512 static u32 disable_cfg_read_retry(void)
1513 {
1514 u32 retry_cnt;
1515
1516 union cvmx_pemx_ctl_status pemx_ctl;
1517 pemx_ctl.u64 = cvmx_read_csr(CVMX_PEMX_CTL_STATUS(1));
1518 retry_cnt = pemx_ctl.s.cfg_rtry;
1519 pemx_ctl.s.cfg_rtry = 0;
1520 cvmx_write_csr(CVMX_PEMX_CTL_STATUS(1), pemx_ctl.u64);
1521 return retry_cnt;
1522 }
1523
is_cfg_retry(void)1524 static int is_cfg_retry(void)
1525 {
1526 union cvmx_pemx_int_sum pemx_int_sum;
1527 pemx_int_sum.u64 = cvmx_read_csr(CVMX_PEMX_INT_SUM(1));
1528 if (pemx_int_sum.s.crs_dr)
1529 return 1;
1530 return 0;
1531 }
1532
1533 /*
1534 * Read a value from configuration space
1535 *
1536 */
octeon_pcie_read_config(unsigned int pcie_port,struct pci_bus * bus,unsigned int devfn,int reg,int size,u32 * val)1537 static int octeon_pcie_read_config(unsigned int pcie_port, struct pci_bus *bus,
1538 unsigned int devfn, int reg, int size,
1539 u32 *val)
1540 {
1541 union octeon_cvmemctl cvmmemctl;
1542 union octeon_cvmemctl cvmmemctl_save;
1543 int bus_number = bus->number;
1544 int cfg_retry = 0;
1545 int retry_cnt = 0;
1546 int max_retry_cnt = 10;
1547 u32 cfg_retry_cnt = 0;
1548
1549 cvmmemctl_save.u64 = 0;
1550 BUG_ON(pcie_port >= ARRAY_SIZE(enable_pcie_bus_num_war));
1551 /*
1552 * For the top level bus make sure our hardware bus number
1553 * matches the software one
1554 */
1555 if (bus->parent == NULL) {
1556 if (enable_pcie_bus_num_war[pcie_port])
1557 bus_number = 0;
1558 else {
1559 union cvmx_pciercx_cfg006 pciercx_cfg006;
1560 pciercx_cfg006.u32 = cvmx_pcie_cfgx_read(pcie_port,
1561 CVMX_PCIERCX_CFG006(pcie_port));
1562 if (pciercx_cfg006.s.pbnum != bus_number) {
1563 pciercx_cfg006.s.pbnum = bus_number;
1564 pciercx_cfg006.s.sbnum = bus_number;
1565 pciercx_cfg006.s.subbnum = bus_number;
1566 cvmx_pcie_cfgx_write(pcie_port,
1567 CVMX_PCIERCX_CFG006(pcie_port),
1568 pciercx_cfg006.u32);
1569 }
1570 }
1571 }
1572
1573 /*
1574 * PCIe only has a single device connected to Octeon. It is
1575 * always device ID 0. Don't bother doing reads for other
1576 * device IDs on the first segment.
1577 */
1578 if ((bus->parent == NULL) && (devfn >> 3 != 0))
1579 return PCIBIOS_FUNC_NOT_SUPPORTED;
1580
1581 /*
1582 * The following is a workaround for the CN57XX, CN56XX,
1583 * CN55XX, and CN54XX errata with PCIe config reads from non
1584 * existent devices. These chips will hang the PCIe link if a
1585 * config read is performed that causes a UR response.
1586 */
1587 if (OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1) ||
1588 OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_1)) {
1589 /*
1590 * For our EBH5600 board, port 0 has a bridge with two
1591 * PCI-X slots. We need a new special checks to make
1592 * sure we only probe valid stuff. The PCIe->PCI-X
1593 * bridge only respondes to device ID 0, function
1594 * 0-1
1595 */
1596 if ((bus->parent == NULL) && (devfn >= 2))
1597 return PCIBIOS_FUNC_NOT_SUPPORTED;
1598 /*
1599 * The PCI-X slots are device ID 2,3. Choose one of
1600 * the below "if" blocks based on what is plugged into
1601 * the board.
1602 */
1603 #if 1
1604 /* Use this option if you aren't using either slot */
1605 if (bus_number == 2)
1606 return PCIBIOS_FUNC_NOT_SUPPORTED;
1607 #elif 0
1608 /*
1609 * Use this option if you are using the first slot but
1610 * not the second.
1611 */
1612 if ((bus_number == 2) && (devfn >> 3 != 2))
1613 return PCIBIOS_FUNC_NOT_SUPPORTED;
1614 #elif 0
1615 /*
1616 * Use this option if you are using the second slot
1617 * but not the first.
1618 */
1619 if ((bus_number == 2) && (devfn >> 3 != 3))
1620 return PCIBIOS_FUNC_NOT_SUPPORTED;
1621 #elif 0
1622 /* Use this opion if you are using both slots */
1623 if ((bus_number == 2) &&
1624 !((devfn == (2 << 3)) || (devfn == (3 << 3))))
1625 return PCIBIOS_FUNC_NOT_SUPPORTED;
1626 #endif
1627
1628 /* The following #if gives a more complicated example. This is
1629 the required checks for running a Nitrox CN16XX-NHBX in the
1630 slot of the EBH5600. This card has a PLX PCIe bridge with
1631 four Nitrox PLX parts behind it */
1632 #if 0
1633 /* PLX bridge with 4 ports */
1634 if ((bus_number == 4) &&
1635 !((devfn >> 3 >= 1) && (devfn >> 3 <= 4)))
1636 return PCIBIOS_FUNC_NOT_SUPPORTED;
1637 /* Nitrox behind PLX 1 */
1638 if ((bus_number == 5) && (devfn >> 3 != 0))
1639 return PCIBIOS_FUNC_NOT_SUPPORTED;
1640 /* Nitrox behind PLX 2 */
1641 if ((bus_number == 6) && (devfn >> 3 != 0))
1642 return PCIBIOS_FUNC_NOT_SUPPORTED;
1643 /* Nitrox behind PLX 3 */
1644 if ((bus_number == 7) && (devfn >> 3 != 0))
1645 return PCIBIOS_FUNC_NOT_SUPPORTED;
1646 /* Nitrox behind PLX 4 */
1647 if ((bus_number == 8) && (devfn >> 3 != 0))
1648 return PCIBIOS_FUNC_NOT_SUPPORTED;
1649 #endif
1650
1651 /*
1652 * Shorten the DID timeout so bus errors for PCIe
1653 * config reads from non existent devices happen
1654 * faster. This allows us to continue booting even if
1655 * the above "if" checks are wrong. Once one of these
1656 * errors happens, the PCIe port is dead.
1657 */
1658 cvmmemctl_save.u64 = __read_64bit_c0_register($11, 7);
1659 cvmmemctl.u64 = cvmmemctl_save.u64;
1660 cvmmemctl.s.didtto = 2;
1661 __write_64bit_c0_register($11, 7, cvmmemctl.u64);
1662 }
1663
1664 if ((OCTEON_IS_MODEL(OCTEON_CN63XX)) && (enable_pcie_14459_war))
1665 cfg_retry_cnt = disable_cfg_read_retry();
1666
1667 pr_debug("pcie_cfg_rd port=%d b=%d devfn=0x%03x reg=0x%03x"
1668 " size=%d ", pcie_port, bus_number, devfn, reg, size);
1669 do {
1670 switch (size) {
1671 case 4:
1672 *val = cvmx_pcie_config_read32(pcie_port, bus_number,
1673 devfn >> 3, devfn & 0x7, reg);
1674 break;
1675 case 2:
1676 *val = cvmx_pcie_config_read16(pcie_port, bus_number,
1677 devfn >> 3, devfn & 0x7, reg);
1678 break;
1679 case 1:
1680 *val = cvmx_pcie_config_read8(pcie_port, bus_number,
1681 devfn >> 3, devfn & 0x7, reg);
1682 break;
1683 default:
1684 if (OCTEON_IS_MODEL(OCTEON_CN63XX))
1685 set_cfg_read_retry(cfg_retry_cnt);
1686 return PCIBIOS_FUNC_NOT_SUPPORTED;
1687 }
1688 if ((OCTEON_IS_MODEL(OCTEON_CN63XX)) &&
1689 (enable_pcie_14459_war)) {
1690 cfg_retry = is_cfg_retry();
1691 retry_cnt++;
1692 if (retry_cnt > max_retry_cnt) {
1693 pr_err(" pcie cfg_read retries failed. retry_cnt=%d\n",
1694 retry_cnt);
1695 cfg_retry = 0;
1696 }
1697 }
1698 } while (cfg_retry);
1699
1700 if ((OCTEON_IS_MODEL(OCTEON_CN63XX)) && (enable_pcie_14459_war))
1701 set_cfg_read_retry(cfg_retry_cnt);
1702 pr_debug("val=%08x : tries=%02d\n", *val, retry_cnt);
1703 if (OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1) ||
1704 OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_1))
1705 write_c0_cvmmemctl(cvmmemctl_save.u64);
1706 return PCIBIOS_SUCCESSFUL;
1707 }
1708
octeon_pcie0_read_config(struct pci_bus * bus,unsigned int devfn,int reg,int size,u32 * val)1709 static int octeon_pcie0_read_config(struct pci_bus *bus, unsigned int devfn,
1710 int reg, int size, u32 *val)
1711 {
1712 return octeon_pcie_read_config(0, bus, devfn, reg, size, val);
1713 }
1714
octeon_pcie1_read_config(struct pci_bus * bus,unsigned int devfn,int reg,int size,u32 * val)1715 static int octeon_pcie1_read_config(struct pci_bus *bus, unsigned int devfn,
1716 int reg, int size, u32 *val)
1717 {
1718 return octeon_pcie_read_config(1, bus, devfn, reg, size, val);
1719 }
1720
octeon_dummy_read_config(struct pci_bus * bus,unsigned int devfn,int reg,int size,u32 * val)1721 static int octeon_dummy_read_config(struct pci_bus *bus, unsigned int devfn,
1722 int reg, int size, u32 *val)
1723 {
1724 return PCIBIOS_FUNC_NOT_SUPPORTED;
1725 }
1726
1727 /*
1728 * Write a value to PCI configuration space
1729 */
octeon_pcie_write_config(unsigned int pcie_port,struct pci_bus * bus,unsigned int devfn,int reg,int size,u32 val)1730 static int octeon_pcie_write_config(unsigned int pcie_port, struct pci_bus *bus,
1731 unsigned int devfn, int reg,
1732 int size, u32 val)
1733 {
1734 int bus_number = bus->number;
1735
1736 BUG_ON(pcie_port >= ARRAY_SIZE(enable_pcie_bus_num_war));
1737
1738 if ((bus->parent == NULL) && (enable_pcie_bus_num_war[pcie_port]))
1739 bus_number = 0;
1740
1741 pr_debug("pcie_cfg_wr port=%d b=%d devfn=0x%03x"
1742 " reg=0x%03x size=%d val=%08x\n", pcie_port, bus_number, devfn,
1743 reg, size, val);
1744
1745
1746 switch (size) {
1747 case 4:
1748 cvmx_pcie_config_write32(pcie_port, bus_number, devfn >> 3,
1749 devfn & 0x7, reg, val);
1750 break;
1751 case 2:
1752 cvmx_pcie_config_write16(pcie_port, bus_number, devfn >> 3,
1753 devfn & 0x7, reg, val);
1754 break;
1755 case 1:
1756 cvmx_pcie_config_write8(pcie_port, bus_number, devfn >> 3,
1757 devfn & 0x7, reg, val);
1758 break;
1759 default:
1760 return PCIBIOS_FUNC_NOT_SUPPORTED;
1761 }
1762 return PCIBIOS_SUCCESSFUL;
1763 }
1764
octeon_pcie0_write_config(struct pci_bus * bus,unsigned int devfn,int reg,int size,u32 val)1765 static int octeon_pcie0_write_config(struct pci_bus *bus, unsigned int devfn,
1766 int reg, int size, u32 val)
1767 {
1768 return octeon_pcie_write_config(0, bus, devfn, reg, size, val);
1769 }
1770
octeon_pcie1_write_config(struct pci_bus * bus,unsigned int devfn,int reg,int size,u32 val)1771 static int octeon_pcie1_write_config(struct pci_bus *bus, unsigned int devfn,
1772 int reg, int size, u32 val)
1773 {
1774 return octeon_pcie_write_config(1, bus, devfn, reg, size, val);
1775 }
1776
octeon_dummy_write_config(struct pci_bus * bus,unsigned int devfn,int reg,int size,u32 val)1777 static int octeon_dummy_write_config(struct pci_bus *bus, unsigned int devfn,
1778 int reg, int size, u32 val)
1779 {
1780 return PCIBIOS_FUNC_NOT_SUPPORTED;
1781 }
1782
1783 static struct pci_ops octeon_pcie0_ops = {
1784 .read = octeon_pcie0_read_config,
1785 .write = octeon_pcie0_write_config,
1786 };
1787
1788 static struct resource octeon_pcie0_mem_resource = {
1789 .name = "Octeon PCIe0 MEM",
1790 .flags = IORESOURCE_MEM,
1791 };
1792
1793 static struct resource octeon_pcie0_io_resource = {
1794 .name = "Octeon PCIe0 IO",
1795 .flags = IORESOURCE_IO,
1796 };
1797
1798 static struct pci_controller octeon_pcie0_controller = {
1799 .pci_ops = &octeon_pcie0_ops,
1800 .mem_resource = &octeon_pcie0_mem_resource,
1801 .io_resource = &octeon_pcie0_io_resource,
1802 };
1803
1804 static struct pci_ops octeon_pcie1_ops = {
1805 .read = octeon_pcie1_read_config,
1806 .write = octeon_pcie1_write_config,
1807 };
1808
1809 static struct resource octeon_pcie1_mem_resource = {
1810 .name = "Octeon PCIe1 MEM",
1811 .flags = IORESOURCE_MEM,
1812 };
1813
1814 static struct resource octeon_pcie1_io_resource = {
1815 .name = "Octeon PCIe1 IO",
1816 .flags = IORESOURCE_IO,
1817 };
1818
1819 static struct pci_controller octeon_pcie1_controller = {
1820 .pci_ops = &octeon_pcie1_ops,
1821 .mem_resource = &octeon_pcie1_mem_resource,
1822 .io_resource = &octeon_pcie1_io_resource,
1823 };
1824
1825 static struct pci_ops octeon_dummy_ops = {
1826 .read = octeon_dummy_read_config,
1827 .write = octeon_dummy_write_config,
1828 };
1829
1830 static struct resource octeon_dummy_mem_resource = {
1831 .name = "Virtual PCIe MEM",
1832 .flags = IORESOURCE_MEM,
1833 };
1834
1835 static struct resource octeon_dummy_io_resource = {
1836 .name = "Virtual PCIe IO",
1837 .flags = IORESOURCE_IO,
1838 };
1839
1840 static struct pci_controller octeon_dummy_controller = {
1841 .pci_ops = &octeon_dummy_ops,
1842 .mem_resource = &octeon_dummy_mem_resource,
1843 .io_resource = &octeon_dummy_io_resource,
1844 };
1845
device_needs_bus_num_war(uint32_t deviceid)1846 static int device_needs_bus_num_war(uint32_t deviceid)
1847 {
1848 #define IDT_VENDOR_ID 0x111d
1849
1850 if ((deviceid & 0xffff) == IDT_VENDOR_ID)
1851 return 1;
1852 return 0;
1853 }
1854
1855 /**
1856 * Initialize the Octeon PCIe controllers
1857 *
1858 * Returns
1859 */
octeon_pcie_setup(void)1860 static int __init octeon_pcie_setup(void)
1861 {
1862 int result;
1863 int host_mode;
1864 int srio_war15205 = 0, port;
1865 union cvmx_sli_ctl_portx sli_ctl_portx;
1866 union cvmx_sriox_status_reg sriox_status_reg;
1867
1868 /* These chips don't have PCIe */
1869 if (!octeon_has_feature(OCTEON_FEATURE_PCIE))
1870 return 0;
1871
1872 /* No PCIe simulation */
1873 if (octeon_is_simulation())
1874 return 0;
1875
1876 /* Disable PCI if instructed on the command line */
1877 if (pcie_disable)
1878 return 0;
1879
1880 /* Point pcibios_map_irq() to the PCIe version of it */
1881 octeon_pcibios_map_irq = octeon_pcie_pcibios_map_irq;
1882
1883 /*
1884 * PCIe I/O range. It is based on port 0 but includes up until
1885 * port 1's end.
1886 */
1887 set_io_port_base(CVMX_ADD_IO_SEG(cvmx_pcie_get_io_base_address(0)));
1888 ioport_resource.start = 0;
1889 ioport_resource.end =
1890 cvmx_pcie_get_io_base_address(1) -
1891 cvmx_pcie_get_io_base_address(0) + cvmx_pcie_get_io_size(1) - 1;
1892
1893 /*
1894 * Create a dummy PCIe controller to swallow up bus 0. IDT bridges
1895 * don't work if the primary bus number is zero. Here we add a fake
1896 * PCIe controller that the kernel will give bus 0. This allows
1897 * us to not change the normal kernel bus enumeration
1898 */
1899 octeon_dummy_controller.io_map_base = -1;
1900 octeon_dummy_controller.mem_resource->start = (1ull<<48);
1901 octeon_dummy_controller.mem_resource->end = (1ull<<48);
1902 register_pci_controller(&octeon_dummy_controller);
1903
1904 if (octeon_has_feature(OCTEON_FEATURE_NPEI)) {
1905 union cvmx_npei_ctl_status npei_ctl_status;
1906 npei_ctl_status.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_CTL_STATUS);
1907 host_mode = npei_ctl_status.s.host_mode;
1908 octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_PCIE;
1909 } else {
1910 union cvmx_mio_rst_ctlx mio_rst_ctl;
1911 mio_rst_ctl.u64 = cvmx_read_csr(CVMX_MIO_RST_CTLX(0));
1912 host_mode = mio_rst_ctl.s.host_mode;
1913 octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_PCIE2;
1914 }
1915
1916 if (host_mode) {
1917 pr_notice("PCIe: Initializing port 0\n");
1918 /* CN63XX pass 1_x/2.0 errata PCIe-15205 */
1919 if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X) ||
1920 OCTEON_IS_MODEL(OCTEON_CN63XX_PASS2_0)) {
1921 sriox_status_reg.u64 = cvmx_read_csr(CVMX_SRIOX_STATUS_REG(0));
1922 if (sriox_status_reg.s.srio) {
1923 srio_war15205 += 1; /* Port is SRIO */
1924 port = 0;
1925 }
1926 }
1927 result = cvmx_pcie_rc_initialize(0);
1928 if (result == 0) {
1929 uint32_t device0;
1930 /* Memory offsets are physical addresses */
1931 octeon_pcie0_controller.mem_offset =
1932 cvmx_pcie_get_mem_base_address(0);
1933 /* IO offsets are Mips virtual addresses */
1934 octeon_pcie0_controller.io_map_base =
1935 CVMX_ADD_IO_SEG(cvmx_pcie_get_io_base_address
1936 (0));
1937 octeon_pcie0_controller.io_offset = 0;
1938 /*
1939 * To keep things similar to PCI, we start
1940 * device addresses at the same place as PCI
1941 * uisng big bar support. This normally
1942 * translates to 4GB-256MB, which is the same
1943 * as most x86 PCs.
1944 */
1945 octeon_pcie0_controller.mem_resource->start =
1946 cvmx_pcie_get_mem_base_address(0) +
1947 (4ul << 30) - (OCTEON_PCI_BAR1_HOLE_SIZE << 20);
1948 octeon_pcie0_controller.mem_resource->end =
1949 cvmx_pcie_get_mem_base_address(0) +
1950 cvmx_pcie_get_mem_size(0) - 1;
1951 /*
1952 * Ports must be above 16KB for the ISA bus
1953 * filtering in the PCI-X to PCI bridge.
1954 */
1955 octeon_pcie0_controller.io_resource->start = 4 << 10;
1956 octeon_pcie0_controller.io_resource->end =
1957 cvmx_pcie_get_io_size(0) - 1;
1958 msleep(100); /* Some devices need extra time */
1959 register_pci_controller(&octeon_pcie0_controller);
1960 device0 = cvmx_pcie_config_read32(0, 0, 0, 0, 0);
1961 enable_pcie_bus_num_war[0] =
1962 device_needs_bus_num_war(device0);
1963 }
1964 } else {
1965 pr_notice("PCIe: Port 0 in endpoint mode, skipping.\n");
1966 /* CN63XX pass 1_x/2.0 errata PCIe-15205 */
1967 if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X) ||
1968 OCTEON_IS_MODEL(OCTEON_CN63XX_PASS2_0)) {
1969 srio_war15205 += 1;
1970 port = 0;
1971 }
1972 }
1973
1974 if (octeon_has_feature(OCTEON_FEATURE_NPEI)) {
1975 host_mode = 1;
1976 /* Skip the 2nd port on CN52XX if port 0 is in 4 lane mode */
1977 if (OCTEON_IS_MODEL(OCTEON_CN52XX)) {
1978 union cvmx_npei_dbg_data dbg_data;
1979 dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA);
1980 if (dbg_data.cn52xx.qlm0_link_width)
1981 host_mode = 0;
1982 }
1983 } else {
1984 union cvmx_mio_rst_ctlx mio_rst_ctl;
1985 mio_rst_ctl.u64 = cvmx_read_csr(CVMX_MIO_RST_CTLX(1));
1986 host_mode = mio_rst_ctl.s.host_mode;
1987 }
1988
1989 if (host_mode) {
1990 pr_notice("PCIe: Initializing port 1\n");
1991 /* CN63XX pass 1_x/2.0 errata PCIe-15205 */
1992 if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X) ||
1993 OCTEON_IS_MODEL(OCTEON_CN63XX_PASS2_0)) {
1994 sriox_status_reg.u64 = cvmx_read_csr(CVMX_SRIOX_STATUS_REG(1));
1995 if (sriox_status_reg.s.srio) {
1996 srio_war15205 += 1; /* Port is SRIO */
1997 port = 1;
1998 }
1999 }
2000 result = cvmx_pcie_rc_initialize(1);
2001 if (result == 0) {
2002 uint32_t device0;
2003 /* Memory offsets are physical addresses */
2004 octeon_pcie1_controller.mem_offset =
2005 cvmx_pcie_get_mem_base_address(1);
2006 /*
2007 * To calculate the address for accessing the 2nd PCIe device,
2008 * either 'io_map_base' (pci_iomap()), or 'mips_io_port_base'
2009 * (ioport_map()) value is added to
2010 * pci_resource_start(dev,bar)). The 'mips_io_port_base' is set
2011 * only once based on first PCIe. Also changing 'io_map_base'
2012 * based on first slot's value so that both the routines will
2013 * work properly.
2014 */
2015 octeon_pcie1_controller.io_map_base =
2016 CVMX_ADD_IO_SEG(cvmx_pcie_get_io_base_address(0));
2017 /* IO offsets are Mips virtual addresses */
2018 octeon_pcie1_controller.io_offset =
2019 cvmx_pcie_get_io_base_address(1) -
2020 cvmx_pcie_get_io_base_address(0);
2021 /*
2022 * To keep things similar to PCI, we start device
2023 * addresses at the same place as PCI uisng big bar
2024 * support. This normally translates to 4GB-256MB,
2025 * which is the same as most x86 PCs.
2026 */
2027 octeon_pcie1_controller.mem_resource->start =
2028 cvmx_pcie_get_mem_base_address(1) + (4ul << 30) -
2029 (OCTEON_PCI_BAR1_HOLE_SIZE << 20);
2030 octeon_pcie1_controller.mem_resource->end =
2031 cvmx_pcie_get_mem_base_address(1) +
2032 cvmx_pcie_get_mem_size(1) - 1;
2033 /*
2034 * Ports must be above 16KB for the ISA bus filtering
2035 * in the PCI-X to PCI bridge.
2036 */
2037 octeon_pcie1_controller.io_resource->start =
2038 cvmx_pcie_get_io_base_address(1) -
2039 cvmx_pcie_get_io_base_address(0);
2040 octeon_pcie1_controller.io_resource->end =
2041 octeon_pcie1_controller.io_resource->start +
2042 cvmx_pcie_get_io_size(1) - 1;
2043 msleep(100); /* Some devices need extra time */
2044 register_pci_controller(&octeon_pcie1_controller);
2045 device0 = cvmx_pcie_config_read32(1, 0, 0, 0, 0);
2046 enable_pcie_bus_num_war[1] =
2047 device_needs_bus_num_war(device0);
2048 }
2049 } else {
2050 pr_notice("PCIe: Port 1 not in root complex mode, skipping.\n");
2051 /* CN63XX pass 1_x/2.0 errata PCIe-15205 */
2052 if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X) ||
2053 OCTEON_IS_MODEL(OCTEON_CN63XX_PASS2_0)) {
2054 srio_war15205 += 1;
2055 port = 1;
2056 }
2057 }
2058
2059 /*
2060 * CN63XX pass 1_x/2.0 errata PCIe-15205 requires setting all
2061 * of SRIO MACs SLI_CTL_PORT*[INT*_MAP] to similar value and
2062 * all of PCIe Macs SLI_CTL_PORT*[INT*_MAP] to different value
2063 * from the previous set values
2064 */
2065 if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X) ||
2066 OCTEON_IS_MODEL(OCTEON_CN63XX_PASS2_0)) {
2067 if (srio_war15205 == 1) {
2068 sli_ctl_portx.u64 = cvmx_read_csr(CVMX_PEXP_SLI_CTL_PORTX(port));
2069 sli_ctl_portx.s.inta_map = 1;
2070 sli_ctl_portx.s.intb_map = 1;
2071 sli_ctl_portx.s.intc_map = 1;
2072 sli_ctl_portx.s.intd_map = 1;
2073 cvmx_write_csr(CVMX_PEXP_SLI_CTL_PORTX(port), sli_ctl_portx.u64);
2074
2075 sli_ctl_portx.u64 = cvmx_read_csr(CVMX_PEXP_SLI_CTL_PORTX(!port));
2076 sli_ctl_portx.s.inta_map = 0;
2077 sli_ctl_portx.s.intb_map = 0;
2078 sli_ctl_portx.s.intc_map = 0;
2079 sli_ctl_portx.s.intd_map = 0;
2080 cvmx_write_csr(CVMX_PEXP_SLI_CTL_PORTX(!port), sli_ctl_portx.u64);
2081 }
2082 }
2083
2084 octeon_pci_dma_init();
2085
2086 return 0;
2087 }
2088 arch_initcall(octeon_pcie_setup);
2089