Hi, On Thu, Jul 16, 2009 at 11:42:25PM +0200, Wolfgang Denk wrote: > 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 <[email protected]> > Cc: Grant Likely <[email protected]> > Cc: Kumar Gala <[email protected]> > Cc: <[email protected]> > > Signed-off-by: Wolfgang Denk <[email protected]> > --- > drivers/net/fs_enet/mii-fec.c | 35 +++++++++++++++++++++++++++++++---- > 1 files changed, 31 insertions(+), 4 deletions(-) > > diff --git a/drivers/net/fs_enet/mii-fec.c b/drivers/net/fs_enet/mii-fec.c > index 75a0999..62b2d7a 100644 > --- a/drivers/net/fs_enet/mii-fec.c > +++ b/drivers/net/fs_enet/mii-fec.c > @@ -103,11 +103,11 @@ 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 +133,34 @@ 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) { > + dev_err(&ofdev->dev, "could not determine IPS/IPB > clock\n"); > + goto out_unmap_regs; > + } > + } else > + clock = ppc_proc_freq; > + > + /* scale for a MII clock <= 2.5 MHz */ > + speed = (clock + 2499999) / 2500000; > + > + /* only 6 bits (25:30) available for MII speed */ > + 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 +209,12 @@ 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
Grepping through 'drivers/*' I see that #ifdefing compatible-entries is highly uncommon (just 3 hits). I think a guideline would be useful. Most people like to avoid #ifdefs at any cost, while I personally think it doesn't spoil readability too much here. Other opinions? Regards, Wolfram -- Pengutronix e.K. | Wolfram Sang | Industrial Linux Solutions | http://www.pengutronix.de/ |
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