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net: ethernet: pcnet32: Setup the SRAM and NOUFLO on Am79C97{3, 5} 

On a MIPS Malta board, tons of fifo underflow errors have been observed
when using u-boot as bootloader instead of YAMON. The reason for that
is that YAMON used to set the pcnet device to SRAM mode but u-boot does
not. As a result, the default Tx threshold (64 bytes) is now too small to
keep the fifo relatively used and it can result to Tx fifo underflow errors.
As a result of which, it's best to setup the SRAM on supported controllers
so we can always use the NOUFLO bit.

Cc: <netdev@vger.kernel.org>
Cc: <stable@vger.kernel.org>
Cc: <linux-kernel@vger.kernel.org>
Cc: Don Fry <pcnet32@frontier.com>
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Markos Chandras 2015-03-19 10:28:14 +00:00 committed by David S. Miller
parent 8e199dfd82
commit 87f966d97b
1 changed files with 29 additions and 2 deletions
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31
drivers/net/ethernet/amd/pcnet32.c
View File

@ -1543,7 +1543,7 @@ pcnet32_probe1(unsigned long ioaddr, int shared, struct pci_dev *pdev)
{
struct pcnet32_private *lp;
int i, media;
int fdx, mii, fset, dxsuflo;
int fdx, mii, fset, dxsuflo, sram;
int chip_version;
char *chipname;
struct net_device *dev;
@ -1580,7 +1580,7 @@ pcnet32_probe1(unsigned long ioaddr, int shared, struct pci_dev *pdev)
}
/* initialize variables */
fdx = mii = fset = dxsuflo = 0;
fdx = mii = fset = dxsuflo = sram = 0;
chip_version = (chip_version >> 12) & 0xffff;
switch (chip_version) {
@ -1613,6 +1613,7 @@ pcnet32_probe1(unsigned long ioaddr, int shared, struct pci_dev *pdev)
chipname = "PCnet/FAST III 79C973"; /* PCI */
fdx = 1;
mii = 1;
sram = 1;
break;
case 0x2626:
chipname = "PCnet/Home 79C978"; /* PCI */
@ -1636,6 +1637,7 @@ pcnet32_probe1(unsigned long ioaddr, int shared, struct pci_dev *pdev)
chipname = "PCnet/FAST III 79C975"; /* PCI */
fdx = 1;
mii = 1;
sram = 1;
break;
case 0x2628:
chipname = "PCnet/PRO 79C976";
@ -1664,6 +1666,31 @@ pcnet32_probe1(unsigned long ioaddr, int shared, struct pci_dev *pdev)
dxsuflo = 1;
}
/*
* The Am79C973/Am79C975 controllers come with 12K of SRAM
* which we can use for the Tx/Rx buffers but most importantly,
* the use of SRAM allow us to use the BCR18:NOUFLO bit to avoid
* Tx fifo underflows.
*/
if (sram) {
/*
* The SRAM is being configured in two steps. First we
* set the SRAM size in the BCR25:SRAM_SIZE bits. According
* to the datasheet, each bit corresponds to a 512-byte
* page so we can have at most 24 pages. The SRAM_SIZE
* holds the value of the upper 8 bits of the 16-bit SRAM size.
* The low 8-bits start at 0x00 and end at 0xff. So the
* address range is from 0x0000 up to 0x17ff. Therefore,
* the SRAM_SIZE is set to 0x17. The next step is to set
* the BCR26:SRAM_BND midway through so the Tx and Rx
* buffers can share the SRAM equally.
*/
a->write_bcr(ioaddr, 25, 0x17);
a->write_bcr(ioaddr, 26, 0xc);
/* And finally enable the NOUFLO bit */
a->write_bcr(ioaddr, 18, a->read_bcr(ioaddr, 18) | (1 << 11));
}
dev = alloc_etherdev(sizeof(*lp));
if (!dev) {
ret = -ENOMEM;