diff options
| author | Stephen Hemminger <shemminger@linux-foundation.org> | 2007-02-26 17:18:39 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-03-02 16:32:46 -0800 |
| commit | 074023e131b7ecba0f7d9ba43ba0df322fc8f129 (patch) | |
| tree | b1e2fb05659466aa98ee3c95ea3032bdfeb937a9 /drivers/net/sky2.c | |
| parent | 1df6a4c30fbd43d9c3baf0dcdb2c60af688f0803 (diff) | |
sky2: fix ram buffer allocation settings
Different chipsets have different amount of ram buffer (some have none),
so need to make sure that driver does proper setup for all cases from 0 on
to 48K, in units of 1K.
This is a backport of the code from 2.6.19 or later
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/net/sky2.c')
| -rw-r--r-- | drivers/net/sky2.c | 33 |
1 files changed, 20 insertions, 13 deletions
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c index ea11d510c4d..71f7126e791 100644 --- a/drivers/net/sky2.c +++ b/drivers/net/sky2.c @@ -700,8 +700,14 @@ static void sky2_mac_init(struct sky2_hw *hw, unsigned port) } /* Assign Ram Buffer allocation in units of 64bit (8 bytes) */ -static void sky2_ramset(struct sky2_hw *hw, u16 q, u32 start, u32 end) +static void sky2_ramset(struct sky2_hw *hw, u16 q, u32 start, u32 space) { + u32 end; + + start *= 1024/8; + space *= 1024/8; + end = start + space - 1; + pr_debug(PFX "q %d %#x %#x\n", q, start, end); sky2_write8(hw, RB_ADDR(q, RB_CTRL), RB_RST_CLR); @@ -1193,20 +1199,21 @@ static int sky2_up(struct net_device *dev) sky2_mac_init(hw, port); - /* Determine available ram buffer space in qwords. */ - ramsize = sky2_read8(hw, B2_E_0) * 4096/8; - - if (ramsize > 6*1024/8) - rxspace = ramsize - (ramsize + 2) / 3; - else - rxspace = ramsize / 2; + /* Determine available ram buffer space (in 4K blocks). */ + ramsize = sky2_read8(hw, B2_E_0) * 4; + if (ramsize != 0) { + if (ramsize < 16) + rxspace = ramsize / 2; + else + rxspace = 8 + (2*(ramsize - 16))/3; - sky2_ramset(hw, rxqaddr[port], 0, rxspace-1); - sky2_ramset(hw, txqaddr[port], rxspace, ramsize-1); + sky2_ramset(hw, rxqaddr[port], 0, rxspace); + sky2_ramset(hw, txqaddr[port], rxspace, ramsize - rxspace); - /* Make sure SyncQ is disabled */ - sky2_write8(hw, RB_ADDR(port == 0 ? Q_XS1 : Q_XS2, RB_CTRL), - RB_RST_SET); + /* Make sure SyncQ is disabled */ + sky2_write8(hw, RB_ADDR(port == 0 ? Q_XS1 : Q_XS2, RB_CTRL), + RB_RST_SET); + } sky2_qset(hw, txqaddr[port]); |