diff options
Diffstat (limited to 'drivers/crypto/ccree/cc_sram_mgr.c')
-rw-r--r-- | drivers/crypto/ccree/cc_sram_mgr.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/drivers/crypto/ccree/cc_sram_mgr.c b/drivers/crypto/ccree/cc_sram_mgr.c new file mode 100644 index 000000000000..c8c276f6dee9 --- /dev/null +++ b/drivers/crypto/ccree/cc_sram_mgr.c @@ -0,0 +1,120 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) 2012-2018 ARM Limited or its affiliates. */ + +#include "cc_driver.h" +#include "cc_sram_mgr.h" + +/** + * struct cc_sram_ctx -Internal RAM context manager + * @sram_free_offset: the offset to the non-allocated area + */ +struct cc_sram_ctx { + cc_sram_addr_t sram_free_offset; +}; + +/** + * cc_sram_mgr_fini() - Cleanup SRAM pool. + * + * @drvdata: Associated device driver context + */ +void cc_sram_mgr_fini(struct cc_drvdata *drvdata) +{ + /* Free "this" context */ + kfree(drvdata->sram_mgr_handle); +} + +/** + * cc_sram_mgr_init() - Initializes SRAM pool. + * The pool starts right at the beginning of SRAM. + * Returns zero for success, negative value otherwise. + * + * @drvdata: Associated device driver context + */ +int cc_sram_mgr_init(struct cc_drvdata *drvdata) +{ + struct cc_sram_ctx *ctx; + dma_addr_t start = 0; + struct device *dev = drvdata_to_dev(drvdata); + + if (drvdata->hw_rev < CC_HW_REV_712) { + /* Pool starts after ROM bytes */ + start = (dma_addr_t)cc_ioread(drvdata, + CC_REG(HOST_SEP_SRAM_THRESHOLD)); + + if ((start & 0x3) != 0) { + dev_err(dev, "Invalid SRAM offset %pad\n", &start); + return -EINVAL; + } + } + + /* Allocate "this" context */ + ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); + + if (!ctx) + return -ENOMEM; + + ctx->sram_free_offset = start; + drvdata->sram_mgr_handle = ctx; + + return 0; +} + +/*! + * Allocated buffer from SRAM pool. + * Note: Caller is responsible to free the LAST allocated buffer. + * This function does not taking care of any fragmentation may occur + * by the order of calls to alloc/free. + * + * \param drvdata + * \param size The requested bytes to allocate + */ +cc_sram_addr_t cc_sram_alloc(struct cc_drvdata *drvdata, u32 size) +{ + struct cc_sram_ctx *smgr_ctx = drvdata->sram_mgr_handle; + struct device *dev = drvdata_to_dev(drvdata); + cc_sram_addr_t p; + + if ((size & 0x3)) { + dev_err(dev, "Requested buffer size (%u) is not multiple of 4", + size); + return NULL_SRAM_ADDR; + } + if (size > (CC_CC_SRAM_SIZE - smgr_ctx->sram_free_offset)) { + dev_err(dev, "Not enough space to allocate %u B (at offset %llu)\n", + size, smgr_ctx->sram_free_offset); + return NULL_SRAM_ADDR; + } + + p = smgr_ctx->sram_free_offset; + smgr_ctx->sram_free_offset += size; + dev_dbg(dev, "Allocated %u B @ %u\n", size, (unsigned int)p); + return p; +} + +/** + * cc_set_sram_desc() - Create const descriptors sequence to + * set values in given array into SRAM. + * Note: each const value can't exceed word size. + * + * @src: A pointer to array of words to set as consts. + * @dst: The target SRAM buffer to set into + * @nelements: The number of words in "src" array + * @seq: A pointer to the given IN/OUT descriptor sequence + * @seq_len: A pointer to the given IN/OUT sequence length + */ +void cc_set_sram_desc(const u32 *src, cc_sram_addr_t dst, + unsigned int nelement, struct cc_hw_desc *seq, + unsigned int *seq_len) +{ + u32 i; + unsigned int idx = *seq_len; + + for (i = 0; i < nelement; i++, idx++) { + hw_desc_init(&seq[idx]); + set_din_const(&seq[idx], src[i], sizeof(u32)); + set_dout_sram(&seq[idx], dst + (i * sizeof(u32)), sizeof(u32)); + set_flow_mode(&seq[idx], BYPASS); + } + + *seq_len = idx; +} |