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mv643xx_eth: detect extended rx coal register field

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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>
This commit is contained in:
Lennert Buytenhek 2008-06-02 01:54:16 +02:00
parent 226bb6b732
commit 773fc3ee7e
1 changed files with 31 additions and 7 deletions
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38
drivers/net/mv643xx_eth.c
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@ -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);