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 * cc_sram_mgr_init() - Initializes SRAM pool. 9 * The pool starts right at the beginning of SRAM. 10 * Returns zero for success, negative value otherwise. 11 * 12 * @drvdata: Associated device driver context 13 * 14 * Return: 15 * 0 for success, negative error code for failure. 16 */ 17 int cc_sram_mgr_init(struct cc_drvdata *drvdata) 18 { 19 u32 start = 0; 20 struct device *dev = drvdata_to_dev(drvdata); 21 22 if (drvdata->hw_rev < CC_HW_REV_712) { 23 /* Pool starts after ROM bytes */ 24 start = cc_ioread(drvdata, CC_REG(HOST_SEP_SRAM_THRESHOLD)); 25 if ((start & 0x3) != 0) { 26 dev_err(dev, "Invalid SRAM offset 0x%x\n", start); 27 return -EINVAL; 28 } 29 } 30 31 drvdata->sram_free_offset = start; 32 return 0; 33 } 34 35 /** 36 * cc_sram_alloc() - Allocate buffer from SRAM pool. 37 * 38 * @drvdata: Associated device driver context 39 * @size: The requested numer of bytes to allocate 40 * 41 * Return: 42 * Address offset in SRAM or NULL_SRAM_ADDR for failure. 43 */ 44 u32 cc_sram_alloc(struct cc_drvdata *drvdata, u32 size) 45 { 46 struct device *dev = drvdata_to_dev(drvdata); 47 u32 p; 48 49 if ((size & 0x3)) { 50 dev_err(dev, "Requested buffer size (%u) is not multiple of 4", 51 size); 52 return NULL_SRAM_ADDR; 53 } 54 if (size > (CC_CC_SRAM_SIZE - drvdata->sram_free_offset)) { 55 dev_err(dev, "Not enough space to allocate %u B (at offset %u)\n", 56 size, drvdata->sram_free_offset); 57 return NULL_SRAM_ADDR; 58 } 59 60 p = drvdata->sram_free_offset; 61 drvdata->sram_free_offset += size; 62 dev_dbg(dev, "Allocated %u B @ %u\n", size, p); 63 return p; 64 } 65 66 /** 67 * cc_set_sram_desc() - Create const descriptors sequence to 68 * set values in given array into SRAM. 69 * Note: each const value can't exceed word size. 70 * 71 * @src: A pointer to array of words to set as consts. 72 * @dst: The target SRAM buffer to set into 73 * @nelement: The number of words in "src" array 74 * @seq: A pointer to the given IN/OUT descriptor sequence 75 * @seq_len: A pointer to the given IN/OUT sequence length 76 */ 77 void cc_set_sram_desc(const u32 *src, u32 dst, unsigned int nelement, 78 struct cc_hw_desc *seq, unsigned int *seq_len) 79 { 80 u32 i; 81 unsigned int idx = *seq_len; 82 83 for (i = 0; i < nelement; i++, idx++) { 84 hw_desc_init(&seq[idx]); 85 set_din_const(&seq[idx], src[i], sizeof(u32)); 86 set_dout_sram(&seq[idx], dst + (i * sizeof(u32)), sizeof(u32)); 87 set_flow_mode(&seq[idx], BYPASS); 88 } 89 90 *seq_len = idx; 91 } 92