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fs_enet/mii-fec.c: fix MII speed calculation 

The MII speed calculation was based on the CPU clock (ppc_proc_freq),
but for MPC512x we must use the bus clock instead.

This patch makes it use the correct clock and makes sure we don't
clobber reserved bits in the MII_SPEED register.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: <netdev@vger.kernel.org>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wolfgang Denk 2009-07-17 02:27:07 +00:00 committed by David S. Miller
parent da8120355e
commit 652f6787c0
1 changed files with 33 additions and 4 deletions
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37
drivers/net/fs_enet/mii-fec.c
View File

@ -36,6 +36,7 @@
#include <asm/pgtable.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/mpc5xxx.h>
#include "fs_enet.h"
#include "fec.h"
@ -103,11 +104,11 @@ static int fs_enet_fec_mii_reset(struct mii_bus *bus)
static int __devinit fs_enet_mdio_probe(struct of_device *ofdev,
const struct of_device_id *match)
{
struct device_node *np = NULL;
struct resource res;
struct mii_bus *new_bus;
struct fec_info *fec;
int ret = -ENOMEM, i;
int (*get_bus_freq)(struct device_node *) = match->data;
int ret = -ENOMEM, clock, speed;
new_bus = mdiobus_alloc();
if (!new_bus)
@ -133,13 +134,35 @@ static int __devinit fs_enet_mdio_probe(struct of_device *ofdev,
if (!fec->fecp)
goto out_fec;
fec->mii_speed = ((ppc_proc_freq + 4999999) / 5000000) << 1;
if (get_bus_freq) {
clock = get_bus_freq(ofdev->node);
if (!clock) {
/* Use maximum divider if clock is unknown */
dev_warn(&ofdev->dev, "could not determine IPS clock\n");
clock = 0x3F * 5000000;
}
} else
clock = ppc_proc_freq;
/*
* Scale for a MII clock <= 2.5 MHz
* Note that only 6 bits (25:30) are available for MII speed.
*/
speed = (clock + 4999999) / 5000000;
if (speed > 0x3F) {
speed = 0x3F;
dev_err(&ofdev->dev,
"MII clock (%d Hz) exceeds max (2.5 MHz)\n",
clock / speed);
}
fec->mii_speed = speed << 1;
setbits32(&fec->fecp->fec_r_cntrl, FEC_RCNTRL_MII_MODE);
setbits32(&fec->fecp->fec_ecntrl, FEC_ECNTRL_PINMUX |
FEC_ECNTRL_ETHER_EN);
out_be32(&fec->fecp->fec_ievent, FEC_ENET_MII);
out_be32(&fec->fecp->fec_mii_speed, fec->mii_speed);
clrsetbits_be32(&fec->fecp->fec_mii_speed, 0x7E, fec->mii_speed);
new_bus->phy_mask = ~0;
new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
@ -188,6 +211,12 @@ static struct of_device_id fs_enet_mdio_fec_match[] = {
{
.compatible = "fsl,pq1-fec-mdio",
},
#if defined(CONFIG_PPC_MPC512x)
{
.compatible = "fsl,mpc5121-fec-mdio",
.data = mpc5xxx_get_bus_frequency,
},
#endif
{},
};