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net: macb: get DMA bus width from design config register

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Get DMA bus width from design config register

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
This commit is contained in:
Bo Shen 2013-09-18 15:07:44 +08:00 • committed by Andreas Bießmann
parent 304db0b38c
commit 32e4f6bf2e
2 changed files with 30 additions and 1 deletions
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20
drivers/net/macb.c
View file

@ -621,6 +621,24 @@ static u32 gem_mdc_clk_div(int id, struct macb_device *macb)
return config;
}
/*
* Get the DMA bus width field of the network configuration register that we
* should program. We find the width from decoding the design configuration
* register to find the maximum supported data bus width.
*/
static u32 macb_dbw(struct macb_device *macb)
{
switch (GEM_BFEXT(DBWDEF, gem_readl(macb, DCFG1))) {
case 4:
return GEM_BF(DBW, GEM_DBW128);
case 2:
return GEM_BF(DBW, GEM_DBW64);
case 1:
default:
return GEM_BF(DBW, GEM_DBW32);
}
}
int macb_eth_initialize(int id, void *regs, unsigned int phy_addr)
{
struct macb_device *macb;
@ -665,7 +683,7 @@ int macb_eth_initialize(int id, void *regs, unsigned int phy_addr)
*/
if (macb_is_gem(macb)) {
ncfgr = gem_mdc_clk_div(id, macb);
ncfgr |= GEM_BF(DBW, 1);
ncfgr |= macb_dbw(macb);
} else {
ncfgr = macb_mdc_clk_div(id, macb);
}