diff options
author | Nick Kossifidis <mickflemm@gmail.com> | 2010-11-23 18:41:15 (GMT) |
---|---|---|
committer | John W. Linville <linville@tuxdriver.com> | 2010-11-30 18:52:30 (GMT) |
commit | d41174fabdae348c6583cf05aeb329da232c342c (patch) | |
tree | 6f1979e64f748c8f6c060c28804424a79f49b0d6 /drivers/net/wireless/ath/ath5k/dma.c | |
parent | 9320b5c4a7260d9593102f378201d17e3f030739 (diff) | |
download | linux-fsl-qoriq-d41174fabdae348c6583cf05aeb329da232c342c.tar.xz |
ath5k: Add new function to stop rx/tx DMA
* Add a new function to stop rx/tx dma and use in when reset starts
Signed-off-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/ath/ath5k/dma.c')
-rw-r--r-- | drivers/net/wireless/ath/ath5k/dma.c | 52 |
1 files changed, 49 insertions, 3 deletions
diff --git a/drivers/net/wireless/ath/ath5k/dma.c b/drivers/net/wireless/ath/ath5k/dma.c index b991b05..ca0467e 100644 --- a/drivers/net/wireless/ath/ath5k/dma.c +++ b/drivers/net/wireless/ath/ath5k/dma.c @@ -126,7 +126,7 @@ int ath5k_hw_start_tx_dma(struct ath5k_hw *ah, unsigned int queue) /* Return if queue is declared inactive */ if (ah->ah_txq[queue].tqi_type == AR5K_TX_QUEUE_INACTIVE) - return -EIO; + return -EINVAL; if (ah->ah_version == AR5K_AR5210) { tx_queue = ath5k_hw_reg_read(ah, AR5K_CR); @@ -174,7 +174,7 @@ int ath5k_hw_start_tx_dma(struct ath5k_hw *ah, unsigned int queue) * * Stop DMA transmit on a specific hw queue and drain queue so we don't * have any pending frames. Returns -EBUSY if we still have pending frames, - * -EINVAL if queue number is out of range. + * -EINVAL if queue number is out of range or inactive. * */ int ath5k_hw_stop_tx_dma(struct ath5k_hw *ah, unsigned int queue) @@ -186,7 +186,7 @@ int ath5k_hw_stop_tx_dma(struct ath5k_hw *ah, unsigned int queue) /* Return if queue is declared inactive */ if (ah->ah_txq[queue].tqi_type == AR5K_TX_QUEUE_INACTIVE) - return -EIO; + return -EINVAL; if (ah->ah_version == AR5K_AR5210) { tx_queue = ath5k_hw_reg_read(ah, AR5K_CR); @@ -733,3 +733,49 @@ void ath5k_hw_dma_init(struct ath5k_hw *ah) ath5k_hw_set_imr(ah, ah->ah_imr); } + +/** + * ath5k_hw_dma_stop - stop DMA unit + * + * @ah: The &struct ath5k_hw + * + * Stop tx/rx DMA and interrupts. Returns + * -EBUSY if tx or rx dma failed to stop. + * + * XXX: Sometimes DMA unit hangs and we have + * stuck frames on tx queues, only a reset + * can fix that. + */ +int ath5k_hw_dma_stop(struct ath5k_hw *ah) +{ + int i, qmax, err; + err = 0; + + /* Disable interrupts */ + ath5k_hw_set_imr(ah, 0); + + /* Stop rx dma */ + err = ath5k_hw_stop_rx_dma(ah); + if (err) + return err; + + /* Clear any pending interrupts + * and disable tx dma */ + if (ah->ah_version != AR5K_AR5210) { + ath5k_hw_reg_write(ah, 0xffffffff, AR5K_PISR); + qmax = AR5K_NUM_TX_QUEUES; + } else { + /* PISR/SISR Not available on 5210 */ + ath5k_hw_reg_read(ah, AR5K_ISR); + qmax = AR5K_NUM_TX_QUEUES_NOQCU; + } + + for (i = 0; i < qmax; i++) { + err = ath5k_hw_stop_tx_dma(ah, i); + /* -EINVAL -> queue inactive */ + if (err != -EINVAL) + return err; + } + + return err; +} |