diff options
Diffstat (limited to 'drivers/net/wireless/intel/iwlwifi/iwl-eeprom-read.c')
| -rw-r--r-- | drivers/net/wireless/intel/iwlwifi/iwl-eeprom-read.c | 394 |
1 files changed, 0 insertions, 394 deletions
diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-eeprom-read.c b/drivers/net/wireless/intel/iwlwifi/iwl-eeprom-read.c deleted file mode 100644 index 5f386bb1a353..000000000000 --- a/drivers/net/wireless/intel/iwlwifi/iwl-eeprom-read.c +++ /dev/null @@ -1,394 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause -/* - * Copyright (C) 2005-2014, 2018-2019, 2021 Intel Corporation - */ -#include <linux/types.h> -#include <linux/slab.h> -#include <linux/export.h> - -#include "iwl-drv.h" -#include "iwl-debug.h" -#include "iwl-eeprom-read.h" -#include "iwl-io.h" -#include "iwl-prph.h" -#include "iwl-csr.h" - -/* - * EEPROM access time values: - * - * Driver initiates EEPROM read by writing byte address << 1 to CSR_EEPROM_REG. - * Driver then polls CSR_EEPROM_REG for CSR_EEPROM_REG_READ_VALID_MSK (0x1). - * When polling, wait 10 uSec between polling loops, up to a maximum 5000 uSec. - * Driver reads 16-bit value from bits 31-16 of CSR_EEPROM_REG. - */ -#define IWL_EEPROM_ACCESS_TIMEOUT 5000 /* uSec */ - -/* - * The device's EEPROM semaphore prevents conflicts between driver and uCode - * when accessing the EEPROM; each access is a series of pulses to/from the - * EEPROM chip, not a single event, so even reads could conflict if they - * weren't arbitrated by the semaphore. - */ -#define IWL_EEPROM_SEM_TIMEOUT 10 /* microseconds */ -#define IWL_EEPROM_SEM_RETRY_LIMIT 1000 /* number of attempts (not time) */ - - -static int iwl_eeprom_acquire_semaphore(struct iwl_trans *trans) -{ - u16 count; - int ret; - - for (count = 0; count < IWL_EEPROM_SEM_RETRY_LIMIT; count++) { - /* Request semaphore */ - iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG, - CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM); - - /* See if we got it */ - ret = iwl_poll_bit(trans, CSR_HW_IF_CONFIG_REG, - CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM, - CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM, - IWL_EEPROM_SEM_TIMEOUT); - if (ret >= 0) { - IWL_DEBUG_EEPROM(trans->dev, - "Acquired semaphore after %d tries.\n", - count+1); - return ret; - } - } - - return ret; -} - -static void iwl_eeprom_release_semaphore(struct iwl_trans *trans) -{ - iwl_clear_bit(trans, CSR_HW_IF_CONFIG_REG, - CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM); -} - -static int iwl_eeprom_verify_signature(struct iwl_trans *trans, bool nvm_is_otp) -{ - u32 gp = iwl_read32(trans, CSR_EEPROM_GP) & CSR_EEPROM_GP_VALID_MSK; - - IWL_DEBUG_EEPROM(trans->dev, "EEPROM signature=0x%08x\n", gp); - - switch (gp) { - case CSR_EEPROM_GP_BAD_SIG_EEP_GOOD_SIG_OTP: - if (!nvm_is_otp) { - IWL_ERR(trans, "EEPROM with bad signature: 0x%08x\n", - gp); - return -ENOENT; - } - return 0; - case CSR_EEPROM_GP_GOOD_SIG_EEP_LESS_THAN_4K: - case CSR_EEPROM_GP_GOOD_SIG_EEP_MORE_THAN_4K: - if (nvm_is_otp) { - IWL_ERR(trans, "OTP with bad signature: 0x%08x\n", gp); - return -ENOENT; - } - return 0; - case CSR_EEPROM_GP_BAD_SIGNATURE_BOTH_EEP_AND_OTP: - default: - IWL_ERR(trans, - "bad EEPROM/OTP signature, type=%s, EEPROM_GP=0x%08x\n", - nvm_is_otp ? "OTP" : "EEPROM", gp); - return -ENOENT; - } -} - -/****************************************************************************** - * - * OTP related functions - * -******************************************************************************/ - -static void iwl_set_otp_access_absolute(struct iwl_trans *trans) -{ - iwl_read32(trans, CSR_OTP_GP_REG); - - iwl_clear_bit(trans, CSR_OTP_GP_REG, - CSR_OTP_GP_REG_OTP_ACCESS_MODE); -} - -static int iwl_nvm_is_otp(struct iwl_trans *trans) -{ - u32 otpgp; - - /* OTP only valid for CP/PP and after */ - switch (trans->hw_rev & CSR_HW_REV_TYPE_MSK) { - case CSR_HW_REV_TYPE_NONE: - IWL_ERR(trans, "Unknown hardware type\n"); - return -EIO; - case CSR_HW_REV_TYPE_5300: - case CSR_HW_REV_TYPE_5350: - case CSR_HW_REV_TYPE_5100: - case CSR_HW_REV_TYPE_5150: - return 0; - default: - otpgp = iwl_read32(trans, CSR_OTP_GP_REG); - if (otpgp & CSR_OTP_GP_REG_DEVICE_SELECT) - return 1; - return 0; - } -} - -static int iwl_init_otp_access(struct iwl_trans *trans) -{ - int ret; - - ret = iwl_finish_nic_init(trans); - if (ret) - return ret; - - iwl_set_bits_prph(trans, APMG_PS_CTRL_REG, - APMG_PS_CTRL_VAL_RESET_REQ); - udelay(5); - iwl_clear_bits_prph(trans, APMG_PS_CTRL_REG, - APMG_PS_CTRL_VAL_RESET_REQ); - - /* - * CSR auto clock gate disable bit - - * this is only applicable for HW with OTP shadow RAM - */ - if (trans->trans_cfg->base_params->shadow_ram_support) - iwl_set_bit(trans, CSR_DBG_LINK_PWR_MGMT_REG, - CSR_RESET_LINK_PWR_MGMT_DISABLED); - - return 0; -} - -static int iwl_read_otp_word(struct iwl_trans *trans, u16 addr, - __le16 *eeprom_data) -{ - int ret = 0; - u32 r; - u32 otpgp; - - iwl_write32(trans, CSR_EEPROM_REG, - CSR_EEPROM_REG_MSK_ADDR & (addr << 1)); - ret = iwl_poll_bit(trans, CSR_EEPROM_REG, - CSR_EEPROM_REG_READ_VALID_MSK, - CSR_EEPROM_REG_READ_VALID_MSK, - IWL_EEPROM_ACCESS_TIMEOUT); - if (ret < 0) { - IWL_ERR(trans, "Time out reading OTP[%d]\n", addr); - return ret; - } - r = iwl_read32(trans, CSR_EEPROM_REG); - /* check for ECC errors: */ - otpgp = iwl_read32(trans, CSR_OTP_GP_REG); - if (otpgp & CSR_OTP_GP_REG_ECC_UNCORR_STATUS_MSK) { - /* stop in this case */ - /* set the uncorrectable OTP ECC bit for acknowledgment */ - iwl_set_bit(trans, CSR_OTP_GP_REG, - CSR_OTP_GP_REG_ECC_UNCORR_STATUS_MSK); - IWL_ERR(trans, "Uncorrectable OTP ECC error, abort OTP read\n"); - return -EINVAL; - } - if (otpgp & CSR_OTP_GP_REG_ECC_CORR_STATUS_MSK) { - /* continue in this case */ - /* set the correctable OTP ECC bit for acknowledgment */ - iwl_set_bit(trans, CSR_OTP_GP_REG, - CSR_OTP_GP_REG_ECC_CORR_STATUS_MSK); - IWL_ERR(trans, "Correctable OTP ECC error, continue read\n"); - } - *eeprom_data = cpu_to_le16(r >> 16); - return 0; -} - -/* - * iwl_is_otp_empty: check for empty OTP - */ -static bool iwl_is_otp_empty(struct iwl_trans *trans) -{ - u16 next_link_addr = 0; - __le16 link_value; - bool is_empty = false; - - /* locate the beginning of OTP link list */ - if (!iwl_read_otp_word(trans, next_link_addr, &link_value)) { - if (!link_value) { - IWL_ERR(trans, "OTP is empty\n"); - is_empty = true; - } - } else { - IWL_ERR(trans, "Unable to read first block of OTP list.\n"); - is_empty = true; - } - - return is_empty; -} - - -/* - * iwl_find_otp_image: find EEPROM image in OTP - * finding the OTP block that contains the EEPROM image. - * the last valid block on the link list (the block _before_ the last block) - * is the block we should read and used to configure the device. - * If all the available OTP blocks are full, the last block will be the block - * we should read and used to configure the device. - * only perform this operation if shadow RAM is disabled - */ -static int iwl_find_otp_image(struct iwl_trans *trans, - u16 *validblockaddr) -{ - u16 next_link_addr = 0, valid_addr; - __le16 link_value = 0; - int usedblocks = 0; - - /* set addressing mode to absolute to traverse the link list */ - iwl_set_otp_access_absolute(trans); - - /* checking for empty OTP or error */ - if (iwl_is_otp_empty(trans)) - return -EINVAL; - - /* - * start traverse link list - * until reach the max number of OTP blocks - * different devices have different number of OTP blocks - */ - do { - /* save current valid block address - * check for more block on the link list - */ - valid_addr = next_link_addr; - next_link_addr = le16_to_cpu(link_value) * sizeof(u16); - IWL_DEBUG_EEPROM(trans->dev, "OTP blocks %d addr 0x%x\n", - usedblocks, next_link_addr); - if (iwl_read_otp_word(trans, next_link_addr, &link_value)) - return -EINVAL; - if (!link_value) { - /* - * reach the end of link list, return success and - * set address point to the starting address - * of the image - */ - *validblockaddr = valid_addr; - /* skip first 2 bytes (link list pointer) */ - *validblockaddr += 2; - return 0; - } - /* more in the link list, continue */ - usedblocks++; - } while (usedblocks <= trans->trans_cfg->base_params->max_ll_items); - - /* OTP has no valid blocks */ - IWL_DEBUG_EEPROM(trans->dev, "OTP has no valid blocks\n"); - return -EINVAL; -} - -/* - * iwl_read_eeprom - read EEPROM contents - * - * Load the EEPROM contents from adapter and return it - * and its size. - * - * NOTE: This routine uses the non-debug IO access functions. - */ -int iwl_read_eeprom(struct iwl_trans *trans, u8 **eeprom, size_t *eeprom_size) -{ - __le16 *e; - u32 gp = iwl_read32(trans, CSR_EEPROM_GP); - int sz; - int ret; - u16 addr; - u16 validblockaddr = 0; - u16 cache_addr = 0; - int nvm_is_otp; - - if (!eeprom || !eeprom_size) - return -EINVAL; - - nvm_is_otp = iwl_nvm_is_otp(trans); - if (nvm_is_otp < 0) - return nvm_is_otp; - - sz = trans->trans_cfg->base_params->eeprom_size; - IWL_DEBUG_EEPROM(trans->dev, "NVM size = %d\n", sz); - - e = kmalloc(sz, GFP_KERNEL); - if (!e) - return -ENOMEM; - - ret = iwl_eeprom_verify_signature(trans, nvm_is_otp); - if (ret < 0) { - IWL_ERR(trans, "EEPROM not found, EEPROM_GP=0x%08x\n", gp); - goto err_free; - } - - /* Make sure driver (instead of uCode) is allowed to read EEPROM */ - ret = iwl_eeprom_acquire_semaphore(trans); - if (ret < 0) { - IWL_ERR(trans, "Failed to acquire EEPROM semaphore.\n"); - goto err_free; - } - - if (nvm_is_otp) { - ret = iwl_init_otp_access(trans); - if (ret) { - IWL_ERR(trans, "Failed to initialize OTP access.\n"); - goto err_unlock; - } - - iwl_write32(trans, CSR_EEPROM_GP, - iwl_read32(trans, CSR_EEPROM_GP) & - ~CSR_EEPROM_GP_IF_OWNER_MSK); - - iwl_set_bit(trans, CSR_OTP_GP_REG, - CSR_OTP_GP_REG_ECC_CORR_STATUS_MSK | - CSR_OTP_GP_REG_ECC_UNCORR_STATUS_MSK); - /* traversing the linked list if no shadow ram supported */ - if (!trans->trans_cfg->base_params->shadow_ram_support) { - ret = iwl_find_otp_image(trans, &validblockaddr); - if (ret) - goto err_unlock; - } - for (addr = validblockaddr; addr < validblockaddr + sz; - addr += sizeof(u16)) { - __le16 eeprom_data; - - ret = iwl_read_otp_word(trans, addr, &eeprom_data); - if (ret) - goto err_unlock; - e[cache_addr / 2] = eeprom_data; - cache_addr += sizeof(u16); - } - } else { - /* eeprom is an array of 16bit values */ - for (addr = 0; addr < sz; addr += sizeof(u16)) { - u32 r; - - iwl_write32(trans, CSR_EEPROM_REG, - CSR_EEPROM_REG_MSK_ADDR & (addr << 1)); - - ret = iwl_poll_bit(trans, CSR_EEPROM_REG, - CSR_EEPROM_REG_READ_VALID_MSK, - CSR_EEPROM_REG_READ_VALID_MSK, - IWL_EEPROM_ACCESS_TIMEOUT); - if (ret < 0) { - IWL_ERR(trans, - "Time out reading EEPROM[%d]\n", addr); - goto err_unlock; - } - r = iwl_read32(trans, CSR_EEPROM_REG); - e[addr / 2] = cpu_to_le16(r >> 16); - } - } - - IWL_DEBUG_EEPROM(trans->dev, "NVM Type: %s\n", - nvm_is_otp ? "OTP" : "EEPROM"); - - iwl_eeprom_release_semaphore(trans); - - *eeprom_size = sz; - *eeprom = (u8 *)e; - return 0; - - err_unlock: - iwl_eeprom_release_semaphore(trans); - err_free: - kfree(e); - - return ret; -} -IWL_EXPORT_SYMBOL(iwl_read_eeprom); |