1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright(c) 2018-2021 Beijing WangXun Technology Co., Ltd. 3 * Copyright(c) 2010-2017 Intel Corporation 4 */ 5 6 #include "ngbe_hw.h" 7 #include "ngbe_mng.h" 8 #include "ngbe_eeprom.h" 9 10 /** 11 * ngbe_init_eeprom_params - Initialize EEPROM params 12 * @hw: pointer to hardware structure 13 * 14 * Initializes the EEPROM parameters ngbe_rom_info within the 15 * ngbe_hw struct in order to set up EEPROM access. 16 **/ 17 s32 ngbe_init_eeprom_params(struct ngbe_hw *hw) 18 { 19 struct ngbe_rom_info *eeprom = &hw->rom; 20 u32 eec; 21 u16 eeprom_size; 22 23 DEBUGFUNC("ngbe_init_eeprom_params"); 24 25 if (eeprom->type != ngbe_eeprom_unknown) 26 return 0; 27 28 eeprom->type = ngbe_eeprom_none; 29 /* Set default semaphore delay to 10ms which is a well 30 * tested value 31 */ 32 eeprom->semaphore_delay = 10; /*ms*/ 33 /* Clear EEPROM page size, it will be initialized as needed */ 34 eeprom->word_page_size = 0; 35 36 /* 37 * Check for EEPROM present first. 38 * If not present leave as none 39 */ 40 eec = rd32(hw, NGBE_SPISTAT); 41 if (!(eec & NGBE_SPISTAT_BPFLASH)) { 42 eeprom->type = ngbe_eeprom_flash; 43 44 /* 45 * SPI EEPROM is assumed here. This code would need to 46 * change if a future EEPROM is not SPI. 47 */ 48 eeprom_size = 4096; 49 eeprom->word_size = eeprom_size >> 1; 50 } 51 52 eeprom->address_bits = 16; 53 eeprom->sw_addr = 0x80; 54 55 DEBUGOUT("eeprom params: type = %d, size = %d, address bits: " 56 "%d %d\n", eeprom->type, eeprom->word_size, 57 eeprom->address_bits, eeprom->sw_addr); 58 59 return 0; 60 } 61 62 /** 63 * ngbe_get_eeprom_semaphore - Get hardware semaphore 64 * @hw: pointer to hardware structure 65 * 66 * Sets the hardware semaphores so EEPROM access can occur for bit-bang method 67 **/ 68 s32 ngbe_get_eeprom_semaphore(struct ngbe_hw *hw) 69 { 70 s32 status = NGBE_ERR_EEPROM; 71 u32 timeout = 2000; 72 u32 i; 73 u32 swsm; 74 75 DEBUGFUNC("ngbe_get_eeprom_semaphore"); 76 77 78 /* Get SMBI software semaphore between device drivers first */ 79 for (i = 0; i < timeout; i++) { 80 /* 81 * If the SMBI bit is 0 when we read it, then the bit will be 82 * set and we have the semaphore 83 */ 84 swsm = rd32(hw, NGBE_SWSEM); 85 if (!(swsm & NGBE_SWSEM_PF)) { 86 status = 0; 87 break; 88 } 89 usec_delay(50); 90 } 91 92 if (i == timeout) { 93 DEBUGOUT("Driver can't access the eeprom - SMBI Semaphore " 94 "not granted.\n"); 95 /* 96 * this release is particularly important because our attempts 97 * above to get the semaphore may have succeeded, and if there 98 * was a timeout, we should unconditionally clear the semaphore 99 * bits to free the driver to make progress 100 */ 101 ngbe_release_eeprom_semaphore(hw); 102 103 usec_delay(50); 104 /* 105 * one last try 106 * If the SMBI bit is 0 when we read it, then the bit will be 107 * set and we have the semaphore 108 */ 109 swsm = rd32(hw, NGBE_SWSEM); 110 if (!(swsm & NGBE_SWSEM_PF)) 111 status = 0; 112 } 113 114 /* Now get the semaphore between SW/FW through the SWESMBI bit */ 115 if (status == 0) { 116 for (i = 0; i < timeout; i++) { 117 /* Set the SW EEPROM semaphore bit to request access */ 118 wr32m(hw, NGBE_MNGSWSYNC, 119 NGBE_MNGSWSYNC_REQ, NGBE_MNGSWSYNC_REQ); 120 121 /* 122 * If we set the bit successfully then we got the 123 * semaphore. 124 */ 125 swsm = rd32(hw, NGBE_MNGSWSYNC); 126 if (swsm & NGBE_MNGSWSYNC_REQ) 127 break; 128 129 usec_delay(50); 130 } 131 132 /* 133 * Release semaphores and return error if SW EEPROM semaphore 134 * was not granted because we don't have access to the EEPROM 135 */ 136 if (i >= timeout) { 137 DEBUGOUT("SWESMBI Software EEPROM semaphore not granted.\n"); 138 ngbe_release_eeprom_semaphore(hw); 139 status = NGBE_ERR_EEPROM; 140 } 141 } else { 142 DEBUGOUT("Software semaphore SMBI between device drivers " 143 "not granted.\n"); 144 } 145 146 return status; 147 } 148 149 /** 150 * ngbe_release_eeprom_semaphore - Release hardware semaphore 151 * @hw: pointer to hardware structure 152 * 153 * This function clears hardware semaphore bits. 154 **/ 155 void ngbe_release_eeprom_semaphore(struct ngbe_hw *hw) 156 { 157 DEBUGFUNC("ngbe_release_eeprom_semaphore"); 158 159 wr32m(hw, NGBE_MNGSWSYNC, NGBE_MNGSWSYNC_REQ, 0); 160 wr32m(hw, NGBE_SWSEM, NGBE_SWSEM_PF, 0); 161 ngbe_flush(hw); 162 } 163 164 /** 165 * ngbe_validate_eeprom_checksum_em - Validate EEPROM checksum 166 * @hw: pointer to hardware structure 167 * @checksum_val: calculated checksum 168 * 169 * Performs checksum calculation and validates the EEPROM checksum. If the 170 * caller does not need checksum_val, the value can be NULL. 171 **/ 172 s32 ngbe_validate_eeprom_checksum_em(struct ngbe_hw *hw, 173 u16 *checksum_val) 174 { 175 u32 eeprom_cksum_devcap = 0; 176 int err = 0; 177 178 DEBUGFUNC("ngbe_validate_eeprom_checksum_em"); 179 UNREFERENCED_PARAMETER(checksum_val); 180 181 /* Check EEPROM only once */ 182 if (hw->bus.lan_id == 0) { 183 wr32(hw, NGBE_CALSUM_CAP_STATUS, 0x0); 184 wr32(hw, NGBE_EEPROM_VERSION_STORE_REG, 0x0); 185 } else { 186 eeprom_cksum_devcap = rd32(hw, NGBE_CALSUM_CAP_STATUS); 187 hw->rom.saved_version = rd32(hw, NGBE_EEPROM_VERSION_STORE_REG); 188 } 189 190 if (hw->bus.lan_id == 0 || eeprom_cksum_devcap == 0) { 191 err = ngbe_hic_check_cap(hw); 192 if (err != 0) { 193 PMD_INIT_LOG(ERR, 194 "The EEPROM checksum is not valid: %d", err); 195 return -EIO; 196 } 197 } 198 199 hw->rom.cksum_devcap = eeprom_cksum_devcap & 0xffff; 200 201 return err; 202 } 203 204