[linux-yocto] [PATCH 09/11] pch_gbe: Add MinnowBoard support
Darren Hart
dvhart at linux.intel.com
Sat May 18 14:46:00 PDT 2013
The MinnowBoard uses an AR803x PHY with the PCH GBE.
It does not implement the RGMII 2ns TX clock delay in the trace routing
nor via strapping. Add a detection method for the board and the PHY and
enable the tx clock delay via the registers.
This PHY will hibernate without link for 10 seconds. Ensure the PHY is
awake for probe and then disable hibernation. A future improvement would
be to convert pch_gbe to using PHYLIB and making sure we can wake the
PHY at the necessary times rather than permanently disabling it.
Unfortunately, the board does not provide a unique PCI device ID. The
the minnow_detect() function fills the gap comparing DMI_BOARD_NAME. It
is admittedly sub-optimal.
Signed-off-by: Darren Hart <dvhart at linux.intel.com>
---
drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe.h | 2 +
.../net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c | 12 +++
.../net/ethernet/oki-semi/pch_gbe/pch_gbe_phy.c | 89 ++++++++++++++++++++++
.../net/ethernet/oki-semi/pch_gbe/pch_gbe_phy.h | 2 +
4 files changed, 105 insertions(+)
diff --git a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe.h b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe.h
index 7fb7e17..bd4e0c5 100644
--- a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe.h
+++ b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe.h
@@ -384,6 +384,7 @@ struct pch_gbe_mac_info {
* @revision: PHY's revision
* @reset_delay_us: HW reset delay time[us]
* @autoneg_advertised: Autoneg advertised
+ * @tx_clk_delay: Setup TX clock delay in the PHY
*/
struct pch_gbe_phy_info {
u32 addr;
@@ -391,6 +392,7 @@ struct pch_gbe_phy_info {
u32 revision;
u32 reset_delay_us;
u16 autoneg_advertised;
+ bool tx_clk_delay;
};
/*!
diff --git a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
index 8adeb4d..f487ad7 100644
--- a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
+++ b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
@@ -23,6 +23,8 @@
#include <linux/module.h>
#include <linux/net_tstamp.h>
#include <linux/ptp_classify.h>
+#include <linux/gpio.h>
+#include <linux/minnowboard.h>
#define DRV_VERSION "1.01"
const char pch_driver_version[] = DRV_VERSION;
@@ -2601,6 +2603,13 @@ static int pch_gbe_probe(struct pci_dev *pdev,
pci_set_drvdata(pdev, netdev);
adapter = netdev_priv(netdev);
+
+ adapter->hw.phy.tx_clk_delay = false;
+ if (minnow_detect()) {
+ adapter->hw.phy.tx_clk_delay = true;
+ minnow_phy_reset();
+ }
+
adapter->netdev = netdev;
adapter->pdev = pdev;
adapter->hw.back = adapter;
@@ -2684,6 +2693,9 @@ static int pch_gbe_probe(struct pci_dev *pdev,
dev_dbg(&pdev->dev, "PCH Network Connection\n");
+ /* Disable hibernation on certain PHYs */
+ pch_gbe_phy_disable_hibernate(&adapter->hw);
+
device_set_wakeup_enable(&pdev->dev, 1);
return 0;
diff --git a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_phy.c b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_phy.c
index 28bb960..bb8d8b4 100644
--- a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_phy.c
+++ b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_phy.c
@@ -20,6 +20,7 @@
#include "pch_gbe.h"
#include "pch_gbe_phy.h"
+#include <linux/gpio.h>
#define PHY_MAX_REG_ADDRESS 0x1F /* 5 bit address bus (0-0x1F) */
@@ -74,6 +75,15 @@
#define MII_SR_100X_FD_CAPS 0x4000 /* 100X Full Duplex Capable */
#define MII_SR_100T4_CAPS 0x8000 /* 100T4 Capable */
+/* AR8031 PHY Debug Registers */
+#define PHY_AR803X_ID 0x00001374
+#define PHY_AR8031_DBG_OFF 0x1D
+#define PHY_AR8031_DBG_DAT 0x1E
+#define PHY_AR8031_SERDES 0x05
+#define PHY_AR8031_HIBERNATE 0x0B
+#define PHY_AR8031_SERDES_TX_CLK_DLY 0x0100 /* TX clock delay of 2.0ns */
+#define PHY_AR8031_PS_HIB_EN 0x8000 /* Hibernate enable */
+
/* Phy Id Register (word 2) */
#define PHY_REVISION_MASK 0x000F
@@ -271,4 +281,83 @@ void pch_gbe_phy_init_setting(struct pch_gbe_hw *hw)
mii_reg |= PHYSP_CTRL_ASSERT_CRS_TX;
pch_gbe_phy_write_reg_miic(hw, PHY_PHYSP_CONTROL, mii_reg);
+ /* Setup a TX clock delay for certain boards */
+ if (hw->phy.tx_clk_delay)
+ pch_gbe_phy_tx_clk_delay(hw);
+}
+
+/**
+ * pch_gbe_phy_tx_clk_delay - Setup TX clock delay via the PHY
+ * @hw: Pointer to the HW structure
+ * Returns
+ * 0: Successful.
+ * -EINVAL: Invalid argument.
+ */
+int pch_gbe_phy_tx_clk_delay(struct pch_gbe_hw *hw)
+{
+ /*
+ * The RGMII interface requires a ~2ns TX clock delay. This is typically
+ * done in layout with a longer trace or via PHY strapping, but can also
+ * be done via PHY configuration registers.
+ */
+ u16 mii_reg;
+ int ret = 0;
+
+ switch (hw->phy.id) {
+ case PHY_AR803X_ID:
+ pch_gbe_phy_read_reg_miic(hw, PHY_AR8031_DBG_OFF, &mii_reg);
+ ret = pch_gbe_phy_write_reg_miic(hw, PHY_AR8031_DBG_OFF,
+ PHY_AR8031_SERDES);
+ if (ret)
+ break;
+
+ pch_gbe_phy_read_reg_miic(hw, PHY_AR8031_DBG_DAT, &mii_reg);
+ mii_reg |= PHY_AR8031_SERDES_TX_CLK_DLY;
+ ret = pch_gbe_phy_write_reg_miic(hw, PHY_AR8031_DBG_DAT,
+ mii_reg);
+ break;
+ default:
+ pr_err("Unknown PHY (%x), could not set TX clock delay.\n",
+ hw->phy.id);
+ return -EINVAL;
+ }
+
+ if (ret)
+ pr_err("Could not configure tx clock delay for PHY.\n");
+ return ret;
+}
+
+/**
+ * pch_gbe_phy_disable_hibernate - Disable the PHY low power state
+ * @hw: Pointer to the HW structure
+ * Returns
+ * 0: Successful.
+ * -EINVAL: Invalid argument.
+ */
+int pch_gbe_phy_disable_hibernate(struct pch_gbe_hw *hw)
+{
+ u16 mii_reg;
+ int ret = 0;
+
+ switch (hw->phy.id) {
+ case PHY_AR803X_ID:
+ ret = pch_gbe_phy_write_reg_miic(hw, PHY_AR8031_DBG_OFF,
+ PHY_AR8031_HIBERNATE);
+ if (ret)
+ break;
+
+ pch_gbe_phy_read_reg_miic(hw, PHY_AR8031_DBG_DAT, &mii_reg);
+ mii_reg &= ~PHY_AR8031_PS_HIB_EN;
+ ret = pch_gbe_phy_write_reg_miic(hw, PHY_AR8031_DBG_DAT,
+ mii_reg);
+ break;
+ default:
+ pr_err("Unknown PHY (%x), could not disable hibernation\n",
+ hw->phy.id);
+ return -EINVAL;
+ }
+
+ if (ret)
+ pr_err("Could not disable PHY hibernation.\n");
+ return ret;
}
diff --git a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_phy.h b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_phy.h
index 03264dc..e3e4bc9 100644
--- a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_phy.h
+++ b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_phy.h
@@ -33,5 +33,7 @@ void pch_gbe_phy_power_up(struct pch_gbe_hw *hw);
void pch_gbe_phy_power_down(struct pch_gbe_hw *hw);
void pch_gbe_phy_set_rgmii(struct pch_gbe_hw *hw);
void pch_gbe_phy_init_setting(struct pch_gbe_hw *hw);
+int pch_gbe_phy_tx_clk_delay(struct pch_gbe_hw *hw);
+int pch_gbe_phy_disable_hibernate(struct pch_gbe_hw *hw);
#endif /* _PCH_GBE_PHY_H_ */
--
1.8.1.2
More information about the linux-yocto
mailing list