diff options
Diffstat (limited to 'carl9170fw/carlfw/src/cam.c')
| -rw-r--r-- | carl9170fw/carlfw/src/cam.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/carl9170fw/carlfw/src/cam.c b/carl9170fw/carlfw/src/cam.c new file mode 100644 index 0000000..7c0e61c --- /dev/null +++ b/carl9170fw/carlfw/src/cam.c @@ -0,0 +1,161 @@ +/* + * carl9170 firmware - used by the ar9170 wireless device + * + * Security Engine + * + * Copyright (c) 2000-2005 ZyDAS Technology Corporation + * Copyright (c) 2007-2009 Atheros Communications, Inc. + * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> + * Copyright 2009-2011 Christian Lamparter <chunkeey@googlemail.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "carl9170.h" +#include "cam.h" + +#ifdef CONFIG_CARL9170FW_SECURITY_ENGINE +static void disable_cam_user(const uint16_t userId) +{ + if (userId <= 31) + andl(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L, (~((uint32_t) 1 << userId))); + else if (userId <= 63) + andl(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H, (~((uint32_t) 1 << (userId - 32)))); +} + +static void enable_cam_user(const uint16_t userId) +{ + if (userId <= 31) + orl(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L, (((uint32_t) 1) << userId)); + else if (userId <= 63) + orl(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H, (((uint32_t) 1) << (userId - 32))); +} + +static void wait_for_cam_read_ready(void) +{ + while ((get(AR9170_MAC_REG_CAM_STATE) & AR9170_MAC_CAM_STATE_READ_PENDING) == 0) { + /* + * wait + */ + } +} + +static void wait_for_cam_write_ready(void) +{ + while ((get(AR9170_MAC_REG_CAM_STATE) & AR9170_MAC_CAM_STATE_WRITE_PENDING) == 0) { + /* + * wait some more + */ + } +} + +static void HW_CAM_Avail(void) +{ + uint32_t tmpValue; + + do { + tmpValue = get(AR9170_MAC_REG_CAM_MODE); + } while (tmpValue & AR9170_MAC_CAM_HOST_PENDING); +} + +static void HW_CAM_Write128(const uint32_t address, const uint32_t *data) +{ + HW_CAM_Avail(); + + set(AR9170_MAC_REG_CAM_DATA0, data[0]); + set(AR9170_MAC_REG_CAM_DATA1, data[1]); + set(AR9170_MAC_REG_CAM_DATA2, data[2]); + set(AR9170_MAC_REG_CAM_DATA3, data[3]); + + set(AR9170_MAC_REG_CAM_ADDR, address | AR9170_MAC_CAM_ADDR_WRITE); + + wait_for_cam_write_ready(); +} + +static void HW_CAM_Read128(const uint32_t address, uint32_t *data) +{ + + HW_CAM_Avail(); + set(AR9170_MAC_REG_CAM_ADDR, address); + + wait_for_cam_read_ready(); + HW_CAM_Avail(); + data[0] = get(AR9170_MAC_REG_CAM_DATA0); + data[1] = get(AR9170_MAC_REG_CAM_DATA1); + data[2] = get(AR9170_MAC_REG_CAM_DATA2); + data[3] = get(AR9170_MAC_REG_CAM_DATA3); +} + +void set_key(const struct carl9170_set_key_cmd *key) +{ + uint32_t data[4]; + uint16_t row, wordId, nibbleId, i; + + if (key->user > (AR9170_CAM_MAX_USER + 3)) + return ; + + if (key->keyId > 1) + return ; + + /* Disable Key */ + disable_cam_user(key->user); + + /* Set encrypt type */ + if (key->user >= AR9170_CAM_MAX_USER) { + /* default */ + row = DEFAULT_ENCRY_TYPE; + wordId = 0; + nibbleId = (key->user - AR9170_CAM_MAX_USER) & 0x7; + } else { + row = ENCRY_TYPE_START_ADDR + (key->user >> 5); + wordId = (key->user >> 3) & 0x3; + nibbleId = key->user & 0x7; + } + + HW_CAM_Read128(row, data); + data[wordId] &= (~(0xf << ((uint32_t) nibbleId * 4))); + data[wordId] |= (key->type << ((uint32_t) nibbleId * 4)); + HW_CAM_Write128(row, data); + + /* Set MAC address */ + if (key->user < AR9170_CAM_MAX_USER) { + uint16_t byteId; + wordId = (key->user >> 2) & 0x3; + byteId = key->user & 0x3; + row = (key->user >> 4) * 6; + + for (i = 0; i < 6; i++) { + HW_CAM_Read128(row + i, data); + data[wordId] &= (~(0xff << ((uint32_t) byteId * 8))); + data[wordId] |= (key->macAddr[i] << ((uint32_t) byteId * 8)); + HW_CAM_Write128(row + i, data); + } + } + + /* Set key */ + row = KEY_START_ADDR + (key->user * 2) + key->keyId; + + HW_CAM_Write128(row, key->key); + + /* Enable Key */ + enable_cam_user(key->user); +} + +void disable_key(const struct carl9170_disable_key_cmd *key) +{ + disable_cam_user(key->user); +} + +#endif /* CONFIG_CARL9170FW_SECURITY_ENGINE */ |