drivers/crypto/ccree/cc_sram_mgr.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (C) 2012-2018 ARM Limited or its affiliates. */
   3
   4 #include "cc_driver.h"
   5 #include "cc_sram_mgr.h"
   6
   7 /**
   8  * struct cc_sram_ctx -Internal RAM context manager
   9  * @sram_free_offset:   the offset to the non-allocated area
  10  */
  11 struct cc_sram_ctx {
  12         cc_sram_addr_t sram_free_offset;
  13 };
  14
  15 /**
  16  * cc_sram_mgr_fini() - Cleanup SRAM pool.
  17  *
  18  * @drvdata: Associated device driver context
  19  */
  20 void cc_sram_mgr_fini(struct cc_drvdata *drvdata)
  21 {
  22         /* Free "this" context */
  23         kfree(drvdata->sram_mgr_handle);
  24 }
  25
  26 /**
  27  * cc_sram_mgr_init() - Initializes SRAM pool.
  28  *      The pool starts right at the beginning of SRAM.
  29  *      Returns zero for success, negative value otherwise.
  30  *
  31  * @drvdata: Associated device driver context
  32  */
  33 int cc_sram_mgr_init(struct cc_drvdata *drvdata)
  34 {
  35         struct cc_sram_ctx *ctx;
  36         dma_addr_t start = 0;
  37         struct device *dev = drvdata_to_dev(drvdata);
  38
  39         if (drvdata->hw_rev < CC_HW_REV_712) {
  40                 /* Pool starts after ROM bytes */
  41                 start = (dma_addr_t)cc_ioread(drvdata,
  42                                               CC_REG(HOST_SEP_SRAM_THRESHOLD));
  43
  44                 if ((start & 0x3) != 0) {
  45                         dev_err(dev, "Invalid SRAM offset %pad\n", &start);
  46                         return -EINVAL;
  47                 }
  48         }
  49
  50         /* Allocate "this" context */
  51         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
  52
  53         if (!ctx)
  54                 return -ENOMEM;
  55
  56         ctx->sram_free_offset = start;
  57         drvdata->sram_mgr_handle = ctx;
  58
  59         return 0;
  60 }
  61
  62 /*!
  63  * Allocated buffer from SRAM pool.
  64  * Note: Caller is responsible to free the LAST allocated buffer.
  65  * This function does not taking care of any fragmentation may occur
  66  * by the order of calls to alloc/free.
  67  *
  68  * \param drvdata
  69  * \param size The requested bytes to allocate
  70  */
  71 cc_sram_addr_t cc_sram_alloc(struct cc_drvdata *drvdata, u32 size)
  72 {
  73         struct cc_sram_ctx *smgr_ctx = drvdata->sram_mgr_handle;
  74         struct device *dev = drvdata_to_dev(drvdata);
  75         cc_sram_addr_t p;
  76
  77         if ((size & 0x3)) {
  78                 dev_err(dev, "Requested buffer size (%u) is not multiple of 4",
  79                         size);
  80                 return NULL_SRAM_ADDR;
  81         }
  82         if (size > (CC_CC_SRAM_SIZE - smgr_ctx->sram_free_offset)) {
  83                 dev_err(dev, "Not enough space to allocate %u B (at offset %llu)\n",
  84                         size, smgr_ctx->sram_free_offset);
  85                 return NULL_SRAM_ADDR;
  86         }
  87
  88         p = smgr_ctx->sram_free_offset;
  89         smgr_ctx->sram_free_offset += size;
  90         dev_dbg(dev, "Allocated %u B @ %u\n", size, (unsigned int)p);
  91         return p;
  92 }
  93
  94 /**
  95  * cc_set_sram_desc() - Create const descriptors sequence to
  96  *      set values in given array into SRAM.
  97  * Note: each const value can't exceed word size.
  98  *
  99  * @src:          A pointer to array of words to set as consts.
 100  * @dst:          The target SRAM buffer to set into
 101  * @nelements:    The number of words in "src" array
 102  * @seq:          A pointer to the given IN/OUT descriptor sequence
 103  * @seq_len:      A pointer to the given IN/OUT sequence length
 104  */
 105 void cc_set_sram_desc(const u32 *src, cc_sram_addr_t dst,
 106                       unsigned int nelement, struct cc_hw_desc *seq,
 107                       unsigned int *seq_len)
 108 {
 109         u32 i;
 110         unsigned int idx = *seq_len;
 111
 112         for (i = 0; i < nelement; i++, idx++) {
 113                 hw_desc_init(&seq[idx]);
 114                 set_din_const(&seq[idx], src[i], sizeof(u32));
 115                 set_dout_sram(&seq[idx], dst + (i * sizeof(u32)), sizeof(u32));
 116                 set_flow_mode(&seq[idx], BYPASS);
 117         }
 118
 119         *seq_len = idx;
 120 }