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authorValentine Barshak <vbarshak@ru.mvista.com>2008-04-22 10:46:48 +1000
committerJeff Garzik <jgarzik@redhat.com>2008-04-25 02:08:08 -0400
commit11121e3008a9282fc185cb2e81eda2d5436d099b (patch)
tree76bdf974ea16692f90c4cea5ab87c3aee81d8ef0 /drivers/net/ibm_newemac/core.c
parent0925ab5d385b6cd1c435c82bfc01898c81f3d062 (diff)
ibm_newemac: PowerPC 440EP/440GR EMAC PHY clock workaround
This patch adds ibm_newemac PHY clock workaround for 440EP/440GR EMAC attached to a PHY which doesn't generate RX clock if there is no link. The code is based on the previous ibm_emac driver stuff. The 440EP/440GR allows controlling each EMAC clock separately as opposed to global clock selection for 440GX. 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>
Diffstat (limited to 'drivers/net/ibm_newemac/core.c')
-rw-r--r--drivers/net/ibm_newemac/core.c43
1 files changed, 42 insertions, 1 deletions
diff --git a/drivers/net/ibm_newemac/core.c b/drivers/net/ibm_newemac/core.c
index 4176dd6a2e8..490d690b5e7 100644
--- a/drivers/net/ibm_newemac/core.c
+++ b/drivers/net/ibm_newemac/core.c
@@ -129,10 +129,35 @@ static struct device_node *emac_boot_list[EMAC_BOOT_LIST_SIZE];
static inline void emac_report_timeout_error(struct emac_instance *dev,
const char *error)
{
- if (net_ratelimit())
+ if (emac_has_feature(dev, EMAC_FTR_440GX_PHY_CLK_FIX |
+ EMAC_FTR_440EP_PHY_CLK_FIX))
+ DBG(dev, "%s" NL, error);
+ else if (net_ratelimit())
printk(KERN_ERR "%s: %s\n", dev->ndev->name, error);
}
+/* EMAC PHY clock workaround:
+ * 440EP/440GR has more sane SDR0_MFR register implementation than 440GX,
+ * which allows controlling each EMAC clock
+ */
+static inline void emac_rx_clk_tx(struct emac_instance *dev)
+{
+#ifdef CONFIG_PPC_DCR_NATIVE
+ if (emac_has_feature(dev, EMAC_FTR_440EP_PHY_CLK_FIX))
+ dcri_clrset(SDR0, SDR0_MFR,
+ 0, SDR0_MFR_ECS >> dev->cell_index);
+#endif
+}
+
+static inline void emac_rx_clk_default(struct emac_instance *dev)
+{
+#ifdef CONFIG_PPC_DCR_NATIVE
+ if (emac_has_feature(dev, EMAC_FTR_440EP_PHY_CLK_FIX))
+ dcri_clrset(SDR0, SDR0_MFR,
+ SDR0_MFR_ECS >> dev->cell_index, 0);
+#endif
+}
+
/* PHY polling intervals */
#define PHY_POLL_LINK_ON HZ
#define PHY_POLL_LINK_OFF (HZ / 5)
@@ -1099,9 +1124,11 @@ static int emac_open(struct net_device *ndev)
int link_poll_interval;
if (dev->phy.def->ops->poll_link(&dev->phy)) {
dev->phy.def->ops->read_link(&dev->phy);
+ emac_rx_clk_default(dev);
netif_carrier_on(dev->ndev);
link_poll_interval = PHY_POLL_LINK_ON;
} else {
+ emac_rx_clk_tx(dev);
netif_carrier_off(dev->ndev);
link_poll_interval = PHY_POLL_LINK_OFF;
}
@@ -1179,6 +1206,7 @@ static void emac_link_timer(struct work_struct *work)
if (dev->phy.def->ops->poll_link(&dev->phy)) {
if (!netif_carrier_ok(dev->ndev)) {
+ emac_rx_clk_default(dev);
/* Get new link parameters */
dev->phy.def->ops->read_link(&dev->phy);
@@ -1191,6 +1219,7 @@ static void emac_link_timer(struct work_struct *work)
link_poll_interval = PHY_POLL_LINK_ON;
} else {
if (netif_carrier_ok(dev->ndev)) {
+ emac_rx_clk_tx(dev);
netif_carrier_off(dev->ndev);
netif_tx_disable(dev->ndev);
emac_reinitialize(dev);
@@ -2340,6 +2369,14 @@ static int __devinit emac_init_phy(struct emac_instance *dev)
if (emac_has_feature(dev, EMAC_FTR_440GX_PHY_CLK_FIX))
dcri_clrset(SDR0, SDR0_MFR, 0, SDR0_MFR_ECS);
#endif
+ /* PHY clock workaround */
+ emac_rx_clk_tx(dev);
+
+ /* Enable internal clock source on 440GX*/
+#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
*/
@@ -2507,6 +2544,10 @@ static int __devinit emac_init_config(struct emac_instance *dev)
dev->features |= EMAC_FTR_EMAC4;
if (of_device_is_compatible(np, "ibm,emac-440gx"))
dev->features |= EMAC_FTR_440GX_PHY_CLK_FIX;
+ } else {
+ if (of_device_is_compatible(np, "ibm,emac-440ep") ||
+ of_device_is_compatible(np, "ibm,emac-440gr"))
+ dev->features |= EMAC_FTR_440EP_PHY_CLK_FIX;
}
/* Fixup some feature bits based on the device tree */