diff options
| author |   Lennert Buytenhek <buytenh@wantstofly.org> | 2008-06-02 01:54:16 +0200 |
|---|---|---|
| committer | Lennert Buytenhek <buytenh@wantstofly.org> | 2008-06-12 08:40:37 +0200 |
| commit | 773fc3ee7ef47081c018c964829b660d6be9ee01 (patch) | |
| tree | 63cd9782ae0312cf044b2bd64ce8bc81002259ee /drivers/net/mv643xx_eth.c | |
| parent | mv643xx_eth: work around TX hang hardware issue (diff) | |
| download | linux-dev-773fc3ee7ef47081c018c964829b660d6be9ee01.tar.xz linux-dev-773fc3ee7ef47081c018c964829b660d6be9ee01.zip | |
mv643xx_eth: detect extended rx coal register field
Newer hardware has a 16-bit instead of a 14-bit RX coalescing
count field in the SDMA_CONFIG register. This patch adds a run-time
check for which of the two we have, and adjusts further writes to the
rx coal count field accordingly.
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Acked-by: Dale Farnsworth <dale@farnsworth.org>
Diffstat (limited to 'drivers/net/mv643xx_eth.c')
| -rw-r--r-- | drivers/net/mv643xx_eth.c | 38 |
1 files changed, 31 insertions, 7 deletions
diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c index c99915740779..296687baccf7 100644 --- a/drivers/net/mv643xx_eth.c +++ b/drivers/net/mv643xx_eth.c @@ -249,6 +249,7 @@ struct mv643xx_eth_shared_private { * Hardware-specific parameters. */ unsigned int t_clk; + int extended_rx_coal_limit; }; @@ -1815,14 +1816,22 @@ static void port_start(struct mv643xx_eth_private *mp) static void set_rx_coal(struct mv643xx_eth_private *mp, unsigned int delay) { unsigned int coal = ((mp->shared->t_clk / 1000000) * delay) / 64; + u32 val; - if (coal > 0x3fff) - coal = 0x3fff; - - wrl(mp, SDMA_CONFIG(mp->port_num), - ((coal & 0x3fff) << 8) | - (rdl(mp, SDMA_CONFIG(mp->port_num)) - & 0xffc000ff)); + val = rdl(mp, SDMA_CONFIG(mp->port_num)); + if (mp->shared->extended_rx_coal_limit) { + if (coal > 0xffff) + coal = 0xffff; + val &= ~0x023fff80; + val |= (coal & 0x8000) << 10; + val |= (coal & 0x7fff) << 7; + } else { + if (coal > 0x3fff) + coal = 0x3fff; + val &= ~0x003fff00; + val |= (coal & 0x3fff) << 8; + } + wrl(mp, SDMA_CONFIG(mp->port_num), val); } static void set_tx_coal(struct mv643xx_eth_private *mp, unsigned int delay) @@ -2087,6 +2096,20 @@ mv643xx_eth_conf_mbus_windows(struct mv643xx_eth_shared_private *msp, msp->win_protect = win_protect; } +static void infer_hw_params(struct mv643xx_eth_shared_private *msp) +{ + /* + * Check whether we have a 14-bit coal limit field in bits + * [21:8], or a 16-bit coal limit in bits [25,21:7] of the + * SDMA config register. + */ + writel(0x02000000, msp->base + SDMA_CONFIG(0)); + if (readl(msp->base + SDMA_CONFIG(0)) & 0x02000000) + msp->extended_rx_coal_limit = 1; + else + msp->extended_rx_coal_limit = 0; +} + static int mv643xx_eth_shared_probe(struct platform_device *pdev) { static int mv643xx_eth_version_printed = 0; @@ -2125,6 +2148,7 @@ static int mv643xx_eth_shared_probe(struct platform_device *pdev) * Detect hardware parameters. */ msp->t_clk = (pd != NULL && pd->t_clk != 0) ? pd->t_clk : 133000000; + infer_hw_params(msp); platform_set_drvdata(pdev, msp); |