crypto/ccree/cc_sram_mgr.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /* Copyright (C) 2012-2019 ARM Limited (or its affiliates). */
0003
0004 #include "cc_driver.h"
0005 #include "cc_sram_mgr.h"
0006
0007 /**
0008  * cc_sram_mgr_init() - Initializes SRAM pool.
0009  *      The pool starts right at the beginning of SRAM.
0010  *      Returns zero for success, negative value otherwise.
0011  *
0012  * @drvdata: Associated device driver context
0013  *
0014  * Return:
0015  * 0 for success, negative error code for failure.
0016  */
0017 int cc_sram_mgr_init(struct cc_drvdata *drvdata)
0018 {
0019     u32 start = 0;
0020     struct device *dev = drvdata_to_dev(drvdata);
0021
0022     if (drvdata->hw_rev < CC_HW_REV_712) {
0023         /* Pool starts after ROM bytes */
0024         start = cc_ioread(drvdata, CC_REG(HOST_SEP_SRAM_THRESHOLD));
0025         if ((start & 0x3) != 0) {
0026             dev_err(dev, "Invalid SRAM offset 0x%x\n", start);
0027             return -EINVAL;
0028         }
0029     }
0030
0031     drvdata->sram_free_offset = start;
0032     return 0;
0033 }
0034
0035 /**
0036  * cc_sram_alloc() - Allocate buffer from SRAM pool.
0037  *
0038  * @drvdata: Associated device driver context
0039  * @size: The requested numer of bytes to allocate
0040  *
0041  * Return:
0042  * Address offset in SRAM or NULL_SRAM_ADDR for failure.
0043  */
0044 u32 cc_sram_alloc(struct cc_drvdata *drvdata, u32 size)
0045 {
0046     struct device *dev = drvdata_to_dev(drvdata);
0047     u32 p;
0048
0049     if ((size & 0x3)) {
0050         dev_err(dev, "Requested buffer size (%u) is not multiple of 4",
0051             size);
0052         return NULL_SRAM_ADDR;
0053     }
0054     if (size > (CC_CC_SRAM_SIZE - drvdata->sram_free_offset)) {
0055         dev_err(dev, "Not enough space to allocate %u B (at offset %u)\n",
0056             size, drvdata->sram_free_offset);
0057         return NULL_SRAM_ADDR;
0058     }
0059
0060     p = drvdata->sram_free_offset;
0061     drvdata->sram_free_offset += size;
0062     dev_dbg(dev, "Allocated %u B @ %u\n", size, p);
0063     return p;
0064 }
0065
0066 /**
0067  * cc_set_sram_desc() - Create const descriptors sequence to
0068  *  set values in given array into SRAM.
0069  * Note: each const value can't exceed word size.
0070  *
0071  * @src:      A pointer to array of words to set as consts.
0072  * @dst:      The target SRAM buffer to set into
0073  * @nelement:     The number of words in "src" array
0074  * @seq:      A pointer to the given IN/OUT descriptor sequence
0075  * @seq_len:      A pointer to the given IN/OUT sequence length
0076  */
0077 void cc_set_sram_desc(const u32 *src, u32 dst, unsigned int nelement,
0078               struct cc_hw_desc *seq, unsigned int *seq_len)
0079 {
0080     u32 i;
0081     unsigned int idx = *seq_len;
0082
0083     for (i = 0; i < nelement; i++, idx++) {
0084         hw_desc_init(&seq[idx]);
0085         set_din_const(&seq[idx], src[i], sizeof(u32));
0086         set_dout_sram(&seq[idx], dst + (i * sizeof(u32)), sizeof(u32));
0087         set_flow_mode(&seq[idx], BYPASS);
0088     }
0089
0090     *seq_len = idx;
0091 }