drivers/staging/octeon/cvmx-fpa.h

   1 /***********************license start***************
   2  * Author: Cavium Networks
   3  *
   4  * Contact: support@caviumnetworks.com
   5  * This file is part of the OCTEON SDK
   6  *
   7  * Copyright (c) 2003-2008 Cavium Networks
   8  *
   9  * This file is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License, Version 2, as
  11  * published by the Free Software Foundation.
  12  *
  13  * This file is distributed in the hope that it will be useful, but
  14  * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
  15  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
  16  * NONINFRINGEMENT.  See the GNU General Public License for more
  17  * details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this file; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  22  * or visit http://www.gnu.org/licenses/.
  23  *
  24  * This file may also be available under a different license from Cavium.
  25  * Contact Cavium Networks for more information
  26  ***********************license end**************************************/
  27
  28 /**
  29  * @file
  30  *
  31  * Interface to the hardware Free Pool Allocator.
  32  *
  33  *
  34  */
  35
  36 #ifndef __CVMX_FPA_H__
  37 #define __CVMX_FPA_H__
  38
  39 #include "cvmx-address.h"
  40 #include "cvmx-fpa-defs.h"
  41
  42 #define CVMX_FPA_NUM_POOLS      8
  43 #define CVMX_FPA_MIN_BLOCK_SIZE 128
  44 #define CVMX_FPA_ALIGNMENT      128
  45
  46 /**
  47  * Structure describing the data format used for stores to the FPA.
  48  */
  49 typedef union {
  50         uint64_t u64;
  51         struct {
  52                 /*
  53                  * the (64-bit word) location in scratchpad to write
  54                  * to (if len != 0)
  55                  */
  56                 uint64_t scraddr:8;
  57                 /* the number of words in the response (0 => no response) */
  58                 uint64_t len:8;
  59                 /* the ID of the device on the non-coherent bus */
  60                 uint64_t did:8;
  61                 /*
  62                  * the address that will appear in the first tick on
  63                  * the NCB bus.
  64                  */
  65                 uint64_t addr:40;
  66         } s;
  67 } cvmx_fpa_iobdma_data_t;
  68
  69 /**
  70  * Structure describing the current state of a FPA pool.
  71  */
  72 typedef struct {
  73         /* Name it was created under */
  74         const char *name;
  75         /* Size of each block */
  76         uint64_t size;
  77         /* The base memory address of whole block */
  78         void *base;
  79         /* The number of elements in the pool at creation */
  80         uint64_t starting_element_count;
  81 } cvmx_fpa_pool_info_t;
  82
  83 /**
  84  * Current state of all the pools. Use access functions
  85  * instead of using it directly.
  86  */
  87 extern cvmx_fpa_pool_info_t cvmx_fpa_pool_info[CVMX_FPA_NUM_POOLS];
  88
  89 /* CSR typedefs have been moved to cvmx-csr-*.h */
  90
  91 /**
  92  * Return the name of the pool
  93  *
  94  * @pool:   Pool to get the name of
  95  * Returns The name
  96  */
  97 static inline const char *cvmx_fpa_get_name(uint64_t pool)
  98 {
  99         return cvmx_fpa_pool_info[pool].name;
 100 }
 101
 102 /**
 103  * Return the base of the pool
 104  *
 105  * @pool:   Pool to get the base of
 106  * Returns The base
 107  */
 108 static inline void *cvmx_fpa_get_base(uint64_t pool)
 109 {
 110         return cvmx_fpa_pool_info[pool].base;
 111 }
 112
 113 /**
 114  * Check if a pointer belongs to an FPA pool. Return non-zero
 115  * if the supplied pointer is inside the memory controlled by
 116  * an FPA pool.
 117  *
 118  * @pool:   Pool to check
 119  * @ptr:    Pointer to check
 120  * Returns Non-zero if pointer is in the pool. Zero if not
 121  */
 122 static inline int cvmx_fpa_is_member(uint64_t pool, void *ptr)
 123 {
 124         return ((ptr >= cvmx_fpa_pool_info[pool].base) &&
 125                 ((char *)ptr <
 126                  ((char *)(cvmx_fpa_pool_info[pool].base)) +
 127                  cvmx_fpa_pool_info[pool].size *
 128                  cvmx_fpa_pool_info[pool].starting_element_count));
 129 }
 130
 131 /**
 132  * Enable the FPA for use. Must be performed after any CSR
 133  * configuration but before any other FPA functions.
 134  */
 135 static inline void cvmx_fpa_enable(void)
 136 {
 137         union cvmx_fpa_ctl_status status;
 138
 139         status.u64 = cvmx_read_csr(CVMX_FPA_CTL_STATUS);
 140         if (status.s.enb) {
 141                 cvmx_dprintf
 142                     ("Warning: Enabling FPA when FPA already enabled.\n");
 143         }
 144
 145         /*
 146          * Do runtime check as we allow pass1 compiled code to run on
 147          * pass2 chips.
 148          */
 149         if (cvmx_octeon_is_pass1()) {
 150                 union cvmx_fpa_fpfx_marks marks;
 151                 int i;
 152                 for (i = 1; i < 8; i++) {
 153                         marks.u64 =
 154                             cvmx_read_csr(CVMX_FPA_FPF1_MARKS + (i - 1) * 8ull);
 155                         marks.s.fpf_wr = 0xe0;
 156                         cvmx_write_csr(CVMX_FPA_FPF1_MARKS + (i - 1) * 8ull,
 157                                        marks.u64);
 158                 }
 159
 160                 /* Enforce a 10 cycle delay between config and enable */
 161                 cvmx_wait(10);
 162         }
 163
 164         /* FIXME: CVMX_FPA_CTL_STATUS read is unmodelled */
 165         status.u64 = 0;
 166         status.s.enb = 1;
 167         cvmx_write_csr(CVMX_FPA_CTL_STATUS, status.u64);
 168 }
 169
 170 /**
 171  * Get a new block from the FPA
 172  *
 173  * @pool:   Pool to get the block from
 174  * Returns Pointer to the block or NULL on failure
 175  */
 176 static inline void *cvmx_fpa_alloc(uint64_t pool)
 177 {
 178         uint64_t address =
 179             cvmx_read_csr(CVMX_ADDR_DID(CVMX_FULL_DID(CVMX_OCT_DID_FPA, pool)));
 180         if (address)
 181                 return cvmx_phys_to_ptr(address);
 182         else
 183                 return NULL;
 184 }
 185
 186 /**
 187  * Asynchronously get a new block from the FPA
 188  *
 189  * @scr_addr: Local scratch address to put response in.  This is a byte address,
 190  *                  but must be 8 byte aligned.
 191  * @pool:      Pool to get the block from
 192  */
 193 static inline void cvmx_fpa_async_alloc(uint64_t scr_addr, uint64_t pool)
 194 {
 195         cvmx_fpa_iobdma_data_t data;
 196
 197         /*
 198          * Hardware only uses 64 bit alligned locations, so convert
 199          * from byte address to 64-bit index
 200          */
 201         data.s.scraddr = scr_addr >> 3;
 202         data.s.len = 1;
 203         data.s.did = CVMX_FULL_DID(CVMX_OCT_DID_FPA, pool);
 204         data.s.addr = 0;
 205         cvmx_send_single(data.u64);
 206 }
 207
 208 /**
 209  * Free a block allocated with a FPA pool.  Does NOT provide memory
 210  * ordering in cases where the memory block was modified by the core.
 211  *
 212  * @ptr:    Block to free
 213  * @pool:   Pool to put it in
 214  * @num_cache_lines:
 215  *               Cache lines to invalidate
 216  */
 217 static inline void cvmx_fpa_free_nosync(void *ptr, uint64_t pool,
 218                                         uint64_t num_cache_lines)
 219 {
 220         cvmx_addr_t newptr;
 221         newptr.u64 = cvmx_ptr_to_phys(ptr);
 222         newptr.sfilldidspace.didspace =
 223             CVMX_ADDR_DIDSPACE(CVMX_FULL_DID(CVMX_OCT_DID_FPA, pool));
 224         /* Prevent GCC from reordering around free */
 225         barrier();
 226         /* value written is number of cache lines not written back */
 227         cvmx_write_io(newptr.u64, num_cache_lines);
 228 }
 229
 230 /**
 231  * Free a block allocated with a FPA pool.  Provides required memory
 232  * ordering in cases where memory block was modified by core.
 233  *
 234  * @ptr:    Block to free
 235  * @pool:   Pool to put it in
 236  * @num_cache_lines:
 237  *               Cache lines to invalidate
 238  */
 239 static inline void cvmx_fpa_free(void *ptr, uint64_t pool,
 240                                  uint64_t num_cache_lines)
 241 {
 242         cvmx_addr_t newptr;
 243         newptr.u64 = cvmx_ptr_to_phys(ptr);
 244         newptr.sfilldidspace.didspace =
 245             CVMX_ADDR_DIDSPACE(CVMX_FULL_DID(CVMX_OCT_DID_FPA, pool));
 246         /*
 247          * Make sure that any previous writes to memory go out before
 248          * we free this buffer.  This also serves as a barrier to
 249          * prevent GCC from reordering operations to after the
 250          * free.
 251          */
 252         CVMX_SYNCWS;
 253         /* value written is number of cache lines not written back */
 254         cvmx_write_io(newptr.u64, num_cache_lines);
 255 }
 256
 257 /**
 258  * Setup a FPA pool to control a new block of memory.
 259  * This can only be called once per pool. Make sure proper
 260  * locking enforces this.
 261  *
 262  * @pool:       Pool to initialize
 263  *                   0 <= pool < 8
 264  * @name:       Constant character string to name this pool.
 265  *                   String is not copied.
 266  * @buffer:     Pointer to the block of memory to use. This must be
 267  *                   accessable by all processors and external hardware.
 268  * @block_size: Size for each block controlled by the FPA
 269  * @num_blocks: Number of blocks
 270  *
 271  * Returns 0 on Success,
 272  *         -1 on failure
 273  */
 274 extern int cvmx_fpa_setup_pool(uint64_t pool, const char *name, void *buffer,
 275                                uint64_t block_size, uint64_t num_blocks);
 276
 277 /**
 278  * Shutdown a Memory pool and validate that it had all of
 279  * the buffers originally placed in it. This should only be
 280  * called by one processor after all hardware has finished
 281  * using the pool.
 282  *
 283  * @pool:   Pool to shutdown
 284  * Returns Zero on success
 285  *         - Positive is count of missing buffers
 286  *         - Negative is too many buffers or corrupted pointers
 287  */
 288 extern uint64_t cvmx_fpa_shutdown_pool(uint64_t pool);
 289
 290 /**
 291  * Get the size of blocks controlled by the pool
 292  * This is resolved to a constant at compile time.
 293  *
 294  * @pool:   Pool to access
 295  * Returns Size of the block in bytes
 296  */
 297 uint64_t cvmx_fpa_get_block_size(uint64_t pool);
 298
 299 #endif /*  __CVM_FPA_H__ */