root/drivers/crypto/ccree/cc_sram_mgr.c

DEFINITIONS

1. cc_sram_mgr_fini
2. cc_sram_mgr_init
3. cc_sram_alloc
4. cc_set_sram_desc

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (C) 2012-2019 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         /* Nothing needed */
  23 }
  24 
  25 /**
  26  * cc_sram_mgr_init() - Initializes SRAM pool.
  27  *      The pool starts right at the beginning of SRAM.
  28  *      Returns zero for success, negative value otherwise.
  29  *
  30  * @drvdata: Associated device driver context
  31  */
  32 int cc_sram_mgr_init(struct cc_drvdata *drvdata)
  33 {
  34         struct cc_sram_ctx *ctx;
  35         dma_addr_t start = 0;
  36         struct device *dev = drvdata_to_dev(drvdata);
  37 
  38         if (drvdata->hw_rev < CC_HW_REV_712) {
  39                 /* Pool starts after ROM bytes */
  40                 start = (dma_addr_t)cc_ioread(drvdata,
  41                                               CC_REG(HOST_SEP_SRAM_THRESHOLD));
  42 
  43                 if ((start & 0x3) != 0) {
  44                         dev_err(dev, "Invalid SRAM offset %pad\n", &start);
  45                         return -EINVAL;
  46                 }
  47         }
  48 
  49         /* Allocate "this" context */
  50         ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
  51 
  52         if (!ctx)
  53                 return -ENOMEM;
  54 
  55         ctx->sram_free_offset = start;
  56         drvdata->sram_mgr_handle = ctx;
  57 
  58         return 0;
  59 }
  60 
  61 /*!
  62  * Allocated buffer from SRAM pool.
  63  * Note: Caller is responsible to free the LAST allocated buffer.
  64  * This function does not taking care of any fragmentation may occur
  65  * by the order of calls to alloc/free.
  66  *
  67  * \param drvdata
  68  * \param size The requested bytes to allocate
  69  */
  70 cc_sram_addr_t cc_sram_alloc(struct cc_drvdata *drvdata, u32 size)
  71 {
  72         struct cc_sram_ctx *smgr_ctx = drvdata->sram_mgr_handle;
  73         struct device *dev = drvdata_to_dev(drvdata);
  74         cc_sram_addr_t p;
  75 
  76         if ((size & 0x3)) {
  77                 dev_err(dev, "Requested buffer size (%u) is not multiple of 4",
  78                         size);
  79                 return NULL_SRAM_ADDR;
  80         }
  81         if (size > (CC_CC_SRAM_SIZE - smgr_ctx->sram_free_offset)) {
  82                 dev_err(dev, "Not enough space to allocate %u B (at offset %llu)\n",
  83                         size, smgr_ctx->sram_free_offset);
  84                 return NULL_SRAM_ADDR;
  85         }
  86 
  87         p = smgr_ctx->sram_free_offset;
  88         smgr_ctx->sram_free_offset += size;
  89         dev_dbg(dev, "Allocated %u B @ %u\n", size, (unsigned int)p);
  90         return p;
  91 }
  92 
  93 /**
  94  * cc_set_sram_desc() - Create const descriptors sequence to
  95  *      set values in given array into SRAM.
  96  * Note: each const value can't exceed word size.
  97  *
  98  * @src:          A pointer to array of words to set as consts.
  99  * @dst:          The target SRAM buffer to set into
 100  * @nelements:    The number of words in "src" array
 101  * @seq:          A pointer to the given IN/OUT descriptor sequence
 102  * @seq_len:      A pointer to the given IN/OUT sequence length
 103  */
 104 void cc_set_sram_desc(const u32 *src, cc_sram_addr_t dst,
 105                       unsigned int nelement, struct cc_hw_desc *seq,
 106                       unsigned int *seq_len)
 107 {
 108         u32 i;
 109         unsigned int idx = *seq_len;
 110 
 111         for (i = 0; i < nelement; i++, idx++) {
 112                 hw_desc_init(&seq[idx]);
 113                 set_din_const(&seq[idx], src[i], sizeof(u32));
 114                 set_dout_sram(&seq[idx], dst + (i * sizeof(u32)), sizeof(u32));
 115                 set_flow_mode(&seq[idx], BYPASS);
 116         }
 117 
 118         *seq_len = idx;
 119 }