From 61c2a80b960361a930a4e3c4c0df694713b9dafd Mon Sep 17 00:00:00 2001 From: Grazvydas Ignotas Date: Wed, 14 Apr 2010 13:05:48 +0300 Subject: [PATCH] wl1251: read default MAC address from EEPROM when available Some wl1251 hardware configurations (like in WG7210 module) have EEPROM attached where NVS data is kept, which includes MAC address. In such configurations, let's read default MAC address from EEPROM, instead of using random one. Signed-off-by: Grazvydas Ignotas Acked-by: Kalle Valo Signed-off-by: John W. Linville --- drivers/net/wireless/wl12xx/wl1251_main.c | 63 +++++++++++++++++++++++ drivers/net/wireless/wl12xx/wl1251_reg.h | 7 +++ 2 files changed, 70 insertions(+) diff --git a/drivers/net/wireless/wl12xx/wl1251_main.c b/drivers/net/wireless/wl12xx/wl1251_main.c index 7b8b21212bf7..390cee7e61a1 100644 --- a/drivers/net/wireless/wl12xx/wl1251_main.c +++ b/drivers/net/wireless/wl12xx/wl1251_main.c @@ -1195,6 +1195,66 @@ static const struct ieee80211_ops wl1251_ops = { .conf_tx = wl1251_op_conf_tx, }; +static int wl1251_read_eeprom_byte(struct wl1251 *wl, off_t offset, u8 *data) +{ + unsigned long timeout; + + wl1251_reg_write32(wl, EE_ADDR, offset); + wl1251_reg_write32(wl, EE_CTL, EE_CTL_READ); + + /* EE_CTL_READ clears when data is ready */ + timeout = jiffies + msecs_to_jiffies(100); + while (1) { + if (!(wl1251_reg_read32(wl, EE_CTL) & EE_CTL_READ)) + break; + + if (time_after(jiffies, timeout)) + return -ETIMEDOUT; + + msleep(1); + } + + *data = wl1251_reg_read32(wl, EE_DATA); + return 0; +} + +static int wl1251_read_eeprom(struct wl1251 *wl, off_t offset, + u8 *data, size_t len) +{ + size_t i; + int ret; + + wl1251_reg_write32(wl, EE_START, 0); + + for (i = 0; i < len; i++) { + ret = wl1251_read_eeprom_byte(wl, offset + i, &data[i]); + if (ret < 0) + return ret; + } + + return 0; +} + +static int wl1251_read_eeprom_mac(struct wl1251 *wl) +{ + u8 mac[ETH_ALEN]; + int i, ret; + + wl1251_set_partition(wl, 0, 0, REGISTERS_BASE, REGISTERS_DOWN_SIZE); + + ret = wl1251_read_eeprom(wl, 0x1c, mac, sizeof(mac)); + if (ret < 0) { + wl1251_warning("failed to read MAC address from EEPROM"); + return ret; + } + + /* MAC is stored in reverse order */ + for (i = 0; i < ETH_ALEN; i++) + wl->mac_addr[i] = mac[ETH_ALEN - i - 1]; + + return 0; +} + static int wl1251_register_hw(struct wl1251 *wl) { int ret; @@ -1241,6 +1301,9 @@ int wl1251_init_ieee80211(struct wl1251 *wl) wl->hw->queues = 4; + if (wl->use_eeprom) + wl1251_read_eeprom_mac(wl); + ret = wl1251_register_hw(wl); if (ret) goto out; diff --git a/drivers/net/wireless/wl12xx/wl1251_reg.h b/drivers/net/wireless/wl12xx/wl1251_reg.h index 0ca3b4326056..d16edd9bf06c 100644 --- a/drivers/net/wireless/wl12xx/wl1251_reg.h +++ b/drivers/net/wireless/wl12xx/wl1251_reg.h @@ -46,7 +46,14 @@ #define SOR_CFG (REGISTERS_BASE + 0x0800) #define ECPU_CTRL (REGISTERS_BASE + 0x0804) #define HI_CFG (REGISTERS_BASE + 0x0808) + +/* EEPROM registers */ #define EE_START (REGISTERS_BASE + 0x080C) +#define EE_CTL (REGISTERS_BASE + 0x2000) +#define EE_DATA (REGISTERS_BASE + 0x2004) +#define EE_ADDR (REGISTERS_BASE + 0x2008) + +#define EE_CTL_READ 2 #define CHIP_ID_B (REGISTERS_BASE + 0x5674) -- 2.20.1