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ibm_newemac: PowerPC 440GX EMAC PHY clock workaround

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The PowerPC 440GX Taishan board fails to reset EMAC3 (reset timeout
error) if there's no link. Because of that it fails to find PHY
chip. The older ibm_emac driver had a workaround for that: the
EMAC_CLK_INTERNAL/EMAC_CLK_EXTERNAL macros, which toggle the Ethernet
Clock Select bit in the SDR0_MFR register. This patch does the same for
"ibm,emac-440gx" compatible chips. The workaround forces clock on -all-
EMACs, so we select clock under global emac_phy_map_lock.

BenH: Made that #ifdef CONFIG_PPC_DCR_NATIVE for now as dcri_* stuff
doesn't exist for MMIO type DCRs like Cell. Some future rework &
improvements of the DCR infrastructure will make that cleaner but
for now, this makes it work.

Signed-off-by: Valentine Barshak <vbarshak@ru.mvista.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Valentine Barshak
2008-04-22 10:46:46 +10:00
committed by Jeff Garzik
parent be63c09afe
commit 0925ab5d38
2 changed files with 23 additions and 3 deletions
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18
drivers/net/ibm_newemac/core.c
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@@ -43,6 +43,8 @@
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/uaccess.h>
#include <asm/dcr.h>
#include <asm/dcr-regs.h>
#include "core.h"
@@ -2333,6 +2335,11 @@ static int __devinit emac_init_phy(struct emac_instance *dev)
dev->phy.mdio_read = emac_mdio_read;
dev->phy.mdio_write = emac_mdio_write;
/* Enable internal clock source */
#ifdef CONFIG_PPC_DCR_NATIVE
if (emac_has_feature(dev, EMAC_FTR_440GX_PHY_CLK_FIX))
dcri_clrset(SDR0, SDR0_MFR, 0, SDR0_MFR_ECS);
#endif
/* Configure EMAC with defaults so we can at least use MDIO
* This is needed mostly for 440GX
*/
@@ -2365,6 +2372,12 @@ static int __devinit emac_init_phy(struct emac_instance *dev)
if (!emac_mii_phy_probe(&dev->phy, i))
break;
}
/* Enable external clock source */
#ifdef CONFIG_PPC_DCR_NATIVE
if (emac_has_feature(dev, EMAC_FTR_440GX_PHY_CLK_FIX))
dcri_clrset(SDR0, SDR0_MFR, SDR0_MFR_ECS, 0);
#endif
mutex_unlock(&emac_phy_map_lock);
if (i == 0x20) {
printk(KERN_WARNING "%s: can't find PHY!\n", np->full_name);
@@ -2490,8 +2503,11 @@ static int __devinit emac_init_config(struct emac_instance *dev)
}
/* Check EMAC version */
if (of_device_is_compatible(np, "ibm,emac4"))
if (of_device_is_compatible(np, "ibm,emac4")) {
dev->features |= EMAC_FTR_EMAC4;
if (of_device_is_compatible(np, "ibm,emac-440gx"))
dev->features |= EMAC_FTR_440GX_PHY_CLK_FIX;
}
/* Fixup some feature bits based on the device tree */
if (of_get_property(np, "has-inverted-stacr-oc", NULL))