diff options
Diffstat (limited to 'drivers/net/sky2.c')
| -rw-r--r-- | drivers/net/sky2.c | 52 |
1 files changed, 30 insertions, 22 deletions
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c index f68ccfbffff3..178249a96e1c 100644 --- a/drivers/net/sky2.c +++ b/drivers/net/sky2.c @@ -625,13 +625,16 @@ static void sky2_mac_init(struct sky2_hw *hw, unsigned port) } -static void sky2_ramset(struct sky2_hw *hw, u16 q, u32 start, size_t len) +/* Assign Ram Buffer allocation. + * start and end are in units of 4k bytes + * ram registers are in units of 64bit words + */ +static void sky2_ramset(struct sky2_hw *hw, u16 q, u8 startk, u8 endk) { - u32 end; + u32 start, end; - start /= 8; - len /= 8; - end = start + len - 1; + start = startk * 4096/8; + end = (endk * 4096/8) - 1; sky2_write8(hw, RB_ADDR(q, RB_CTRL), RB_RST_CLR); sky2_write32(hw, RB_ADDR(q, RB_START), start); @@ -640,14 +643,19 @@ static void sky2_ramset(struct sky2_hw *hw, u16 q, u32 start, size_t len) sky2_write32(hw, RB_ADDR(q, RB_RP), start); if (q == Q_R1 || q == Q_R2) { - u32 rxup, rxlo; + u32 space = (endk - startk) * 4096/8; + u32 tp = space - space/4; - rxlo = len/2; - rxup = rxlo + len/4; + /* On receive queue's set the thresholds + * give receiver priority when > 3/4 full + * send pause when down to 2K + */ + sky2_write32(hw, RB_ADDR(q, RB_RX_UTHP), tp); + sky2_write32(hw, RB_ADDR(q, RB_RX_LTHP), space/2); - /* Set thresholds on receive queue's */ - sky2_write32(hw, RB_ADDR(q, RB_RX_UTPP), rxup); - sky2_write32(hw, RB_ADDR(q, RB_RX_LTPP), rxlo); + tp = space - 2048/8; + sky2_write32(hw, RB_ADDR(q, RB_RX_UTPP), tp); + sky2_write32(hw, RB_ADDR(q, RB_RX_LTPP), space/4); } else { /* Enable store & forward on Tx queue's because * Tx FIFO is only 1K on Yukon @@ -1002,19 +1010,19 @@ static int sky2_up(struct net_device *dev) sky2_mac_init(hw, port); - /* Configure RAM buffers */ - if (hw->chip_id == CHIP_ID_YUKON_FE || - (hw->chip_id == CHIP_ID_YUKON_EC && hw->chip_rev == 2)) - ramsize = 4096; - else { - u8 e0 = sky2_read8(hw, B2_E_0); - ramsize = (e0 == 0) ? (128 * 1024) : (e0 * 4096); - } + /* Determine available ram buffer space (in 4K blocks). + * Note: not sure about the FE setting below yet + */ + if (hw->chip_id == CHIP_ID_YUKON_FE) + ramsize = 4; + else + ramsize = sky2_read8(hw, B2_E_0); + + /* Give transmitter one third (rounded up) */ + rxspace = ramsize - (ramsize + 2) / 3; - /* 2/3 for Rx */ - rxspace = (2 * ramsize) / 3; sky2_ramset(hw, rxqaddr[port], 0, rxspace); - sky2_ramset(hw, txqaddr[port], rxspace, ramsize - rxspace); + sky2_ramset(hw, txqaddr[port], rxspace, ramsize); /* Make sure SyncQ is disabled */ sky2_write8(hw, RB_ADDR(port == 0 ? Q_XS1 : Q_XS2, RB_CTRL), |