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TOMOYO Linux Cross Reference
Linux/arch/mips/pci/pcie-octeon.c

Version: ~ [ linux-4.20-rc6 ] ~ [ linux-4.19.8 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.87 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.144 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.166 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.128 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.61 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.31.14 ] ~ [ linux-2.6.30.10 ] ~ [ linux-2.6.29.6 ] ~ [ linux-2.6.28.10 ] ~ [ linux-2.6.27.62 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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  */
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  */
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  */
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  */
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  */
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  */
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  */
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  */
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  */
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  */
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  */
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  */
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  */
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  */
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  */
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 
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  */
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. '' == 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  */
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  */
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  */
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  */
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 
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 
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 
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  */
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 
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 
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 
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  */
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 
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 
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 
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 
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  */
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 

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