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Message-ID: <20080327144211.GA9088@ru.mvista.com>
Date: Thu, 27 Mar 2008 17:42:11 +0300
From: Valentine Barshak <vbarshak@...mvista.com>
To: linuxppc-dev@...abs.org
Cc: benh@...nel.crashing.org, jwboyer@...ux.vnet.ibm.com,
jeff@...zik.org, netdev@...r.kernel.org
Subject: [PATCH 2/2] 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.
Signed-off-by: Valentine Barshak <vbarshak@...mvista.com>
---
drivers/net/ibm_newemac/core.c | 34 ++++++++++++++++++++++++++++++++--
drivers/net/ibm_newemac/core.h | 6 +++++-
2 files changed, 37 insertions(+), 3 deletions(-)
diff -pruN linux-2.6.orig/drivers/net/ibm_newemac/core.c linux-2.6/drivers/net/ibm_newemac/core.c
--- linux-2.6.orig/drivers/net/ibm_newemac/core.c 2008-02-26 16:32:33.000000000 +0300
+++ linux-2.6/drivers/net/ibm_newemac/core.c 2008-02-26 16:37:52.000000000 +0300
@@ -129,10 +129,29 @@ static struct device_node *emac_boot_lis
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)
+{
+ if (emac_has_feature(dev, EMAC_FTR_440EP_PHY_CLK_FIX))
+ dcri_clrset(SDR0, SDR0_MFR, 0, SDR0_MFR_ECS >> dev->cell_index);
+}
+
+static inline void emac_rx_clk_default(struct emac_instance *dev)
+{
+ if (emac_has_feature(dev, EMAC_FTR_440EP_PHY_CLK_FIX))
+ dcri_clrset(SDR0, SDR0_MFR, SDR0_MFR_ECS >> dev->cell_index, 0);
+}
+
/* PHY polling intervals */
#define PHY_POLL_LINK_ON HZ
#define PHY_POLL_LINK_OFF (HZ / 5)
@@ -1089,9 +1112,11 @@ static int emac_open(struct net_device *
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;
}
@@ -1169,6 +1194,7 @@ static void emac_link_timer(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);
@@ -1181,6 +1207,7 @@ static void emac_link_timer(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);
@@ -2325,9 +2352,12 @@ static int __devinit emac_init_phy(struc
dev->phy.mdio_read = emac_mdio_read;
dev->phy.mdio_write = emac_mdio_write;
- /* Enable internal clock source */
+ /* EMAC PHY clock workaround */
if (emac_has_feature(dev, EMAC_FTR_440GX_PHY_CLK_FIX))
+ /* Enable internal clock source */
dcri_clrset(SDR0, SDR0_MFR, 0, SDR0_MFR_ECS);
+ else
+ emac_rx_clk_tx(dev);
/* Configure EMAC with defaults so we can at least use MDIO
* This is needed mostly for 440GX
@@ -2495,6 +2525,10 @@ static int __devinit emac_init_config(st
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 */
diff -pruN linux-2.6.orig/drivers/net/ibm_newemac/core.h linux-2.6/drivers/net/ibm_newemac/core.h
--- linux-2.6.orig/drivers/net/ibm_newemac/core.h 2008-02-26 16:32:33.000000000 +0300
+++ linux-2.6/drivers/net/ibm_newemac/core.h 2008-02-26 16:37:52.000000000 +0300
@@ -305,6 +305,10 @@ struct emac_instance {
* Set if we need phy clock workaround for 440gx
*/
#define EMAC_FTR_440GX_PHY_CLK_FIX 0x00000080
+/*
+ * Set if we need phy clock workaround for 440ep or 440gr
+ */
+#define EMAC_FTR_440EP_PHY_CLK_FIX 0x00000100
/* Right now, we don't quite handle the always/possible masks on the
@@ -328,7 +332,7 @@ enum {
#ifdef CONFIG_IBM_NEW_EMAC_RGMII
EMAC_FTR_HAS_RGMII |
#endif
- 0,
+ EMAC_FTR_440EP_PHY_CLK_FIX,
};
static inline int emac_has_feature(struct emac_instance *dev,
--
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