diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/wireless/ath/ath9k/hw.c | 36 | ||||
| -rw-r--r-- | drivers/net/wireless/ath/ath9k/reg.h | 3 |
2 files changed, 39 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c index 7cee89b81fc..be9c0b69188 100644 --- a/drivers/net/wireless/ath/ath9k/hw.c +++ b/drivers/net/wireless/ath/ath9k/hw.c @@ -1040,6 +1040,22 @@ static void ath9k_hw_init_qos(struct ath_hw *ah) REG_WRITE(ah, AR_TXOP_12_15, 0xFFFFFFFF); } +static void ath9k_hw_change_target_baud(struct ath_hw *ah, u32 freq, u32 baud) +{ + u32 lcr; + u32 baud_divider = freq * 1000 * 1000 / 16 / baud; + + lcr = REG_READ(ah , 0x5100c); + lcr |= 0x80; + + REG_WRITE(ah, 0x5100c, lcr); + REG_WRITE(ah, 0x51004, (baud_divider >> 8)); + REG_WRITE(ah, 0x51000, (baud_divider & 0xff)); + + lcr &= ~0x80; + REG_WRITE(ah, 0x5100c, lcr); +} + static void ath9k_hw_init_pll(struct ath_hw *ah, struct ath9k_channel *chan) { @@ -1103,6 +1119,26 @@ static void ath9k_hw_init_pll(struct ath_hw *ah, } REG_WRITE(ah, AR_RTC_PLL_CONTROL, pll); + /* Switch the core clock for ar9271 to 117Mhz */ + if (AR_SREV_9271(ah)) { + if ((pll == 0x142c) || (pll == 0x2850) ) { + udelay(500); + /* set CLKOBS to output AHB clock */ + REG_WRITE(ah, 0x7020, 0xe); + /* + * 0x304: 117Mhz, ahb_ratio: 1x1 + * 0x306: 40Mhz, ahb_ratio: 1x1 + */ + REG_WRITE(ah, 0x50040, 0x304); + /* + * makes adjustments for the baud dividor to keep the + * targetted baud rate based on the used core clock. + */ + ath9k_hw_change_target_baud(ah, AR9271_CORE_CLOCK, + AR9271_TARGET_BAUD_RATE); + } + } + udelay(RTC_PLL_SETTLE_DELAY); REG_WRITE(ah, AR_RTC_SLEEP_CLK, AR_RTC_FORCE_DERIVED_CLK); diff --git a/drivers/net/wireless/ath/ath9k/reg.h b/drivers/net/wireless/ath/ath9k/reg.h index ceed0095efa..061e12ce0b2 100644 --- a/drivers/net/wireless/ath/ath9k/reg.h +++ b/drivers/net/wireless/ath/ath9k/reg.h @@ -1704,4 +1704,7 @@ enum { #define AR_KEYTABLE_MAC0(_n) (AR_KEYTABLE(_n) + 24) #define AR_KEYTABLE_MAC1(_n) (AR_KEYTABLE(_n) + 28) +#define AR9271_CORE_CLOCK 117 /* clock to 117Mhz */ +#define AR9271_TARGET_BAUD_RATE 19200 /* 115200 */ + #endif |