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 } 121