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Subject[PATCH 3/3] netdev/phy: Add driver for Broadcom BCM8706 10G Ethernet PHY
Date
Add a driver and PHY_ID number for said device.  This is a 10Gig PHY
which uses MII_ADDR_C45 addressing, it is always 10G full duplex, so
there is no autonegotiation. All we do is report link state and send
interrupts when it changes.

If the PHY has a device tree of_node associated with it, the
"broadcom,c45-reg-init" property is used to supply register
initialization values when config_init() is called.

Signed-off-by: David Daney <david.daney@cavium.com>
---
.../devicetree/bindings/net/broadcom-bcm8706.txt | 28 +++
drivers/net/phy/Kconfig | 5 +
drivers/net/phy/Makefile | 1 +
drivers/net/phy/bcm8706.c | 212 ++++++++++++++++++++
include/linux/brcmphy.h | 1 +
5 files changed, 247 insertions(+), 0 deletions(-)
create mode 100644 Documentation/devicetree/bindings/net/broadcom-bcm8706.txt
create mode 100644 drivers/net/phy/bcm8706.c

diff --git a/Documentation/devicetree/bindings/net/broadcom-bcm8706.txt b/Documentation/devicetree/bindings/net/broadcom-bcm8706.txt
new file mode 100644
index 0000000..d58bea9
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/broadcom-bcm8706.txt
@@ -0,0 +1,28 @@
+The Broadcom BCM8706 is a 10G Ethernet PHY. It has these bindings in
+addition to the standard PHY bindings.
+
+Compatible: Should contain "broadcom,bcm8706" and
+ "ethernet-phy-ieee802.3-c45"
+
+Optional Properties:
+
+- broadcom,c45-reg-init : one of more sets of 4 cells. The first cell
+ is the device type, the second a register address, the third cell
+ contains a mask to be ANDed with the existing register value, and
+ the fourth cell is ORed with he result to yield the new register
+ value.
+
+Example:
+
+ ethernet-phy@5 {
+ reg = <5>;
+ compatible = "broadcom,bcm8706", "ethernet-phy-ieee802.3-c45";
+ interrupt-parent = <&gpio>;
+ interrupts = <12 8>; /* Pin 12, active low */
+ /*
+ * Set PMD Digital Control Register for
+ * GPIO[1] Tx/Rx
+ * GPIO[0] R64 Sync Acquired
+ */
+ broadcom,c45-reg-init = <1 0xc808 0xff8f 0x70>;
+ };
diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 59b3b17..a99885f 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -62,6 +62,11 @@ config BCM63XX_PHY
---help---
Currently supports the 6348 and 6358 PHYs.

+config BCM8706_PHY
+ tristate "Driver for Broadcom BCM8706 10G Ethernet PHY"
+ help
+ Currently supports only the BCM8706 PHY.
+
config ICPLUS_PHY
tristate "Drivers for ICPlus PHYs"
---help---
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index d1a1927..ec46398 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_SMSC_PHY) += smsc.o
obj-$(CONFIG_VITESSE_PHY) += vitesse.o
obj-$(CONFIG_BROADCOM_PHY) += broadcom.o
obj-$(CONFIG_BCM63XX_PHY) += bcm63xx.o
+obj-$(CONFIG_BCM8706_PHY) += bcm8706.o
obj-$(CONFIG_ICPLUS_PHY) += icplus.o
obj-$(CONFIG_REALTEK_PHY) += realtek.o
obj-$(CONFIG_LSI_ET1011C_PHY) += et1011c.o
diff --git a/drivers/net/phy/bcm8706.c b/drivers/net/phy/bcm8706.c
new file mode 100644
index 0000000..3a23e04
--- /dev/null
+++ b/drivers/net/phy/bcm8706.c
@@ -0,0 +1,212 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2011 Cavium, Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/phy.h>
+#include <linux/brcmphy.h>
+#include <linux/of.h>
+
+#define BCM8706_PMD_RX_SIGNAL_DETECT (MII_ADDR_C45 | 0x1000a)
+#define BCM8706_10GBASER_PCS_STATUS (MII_ADDR_C45 | 0x30020)
+#define BCM8706_XGXS_LANE_STATUS (MII_ADDR_C45 | 0x40018)
+
+#define BCM8706_LASI_CONTROL (MII_ADDR_C45 | 0x39002)
+#define BCM8706_LASI_STATUS (MII_ADDR_C45 | 0x39005)
+
+#ifdef CONFIG_OF_MDIO
+/*
+ * Set and/or override some configuration registers based on the
+ * broadcom,c45-reg-init property stored in the of_node for the phydev.
+ *
+ * broadcom,c45-reg-init = <devid reg mask value>,...;
+ *
+ * There may be one or more sets of <devid reg mask value>:
+ *
+ * devid: which sub-device to use.
+ * reg: the register.
+ * mask: if non-zero, ANDed with existing register value.
+ * value: ORed with the masked value and written to the regiser.
+ *
+ */
+static int bcm8706_of_reg_init(struct phy_device *phydev)
+{
+ const __be32 *paddr;
+ int len, i, ret;
+
+ if (!phydev->dev.of_node)
+ return 0;
+
+ paddr = of_get_property(phydev->dev.of_node,
+ "broadcom,c45-reg-init", &len);
+ if (!paddr || len < (4 * sizeof(*paddr)))
+ return 0;
+
+ ret = 0;
+ len /= sizeof(*paddr);
+ for (i = 0; i < len - 3; i += 4) {
+ u16 devid = be32_to_cpup(paddr + i);
+ u16 reg = be32_to_cpup(paddr + i + 1);
+ u16 mask = be32_to_cpup(paddr + i + 2);
+ u16 val_bits = be32_to_cpup(paddr + i + 3);
+ int val;
+ u32 regnum = MII_ADDR_C45 | (devid << 16) | reg;
+ val = 0;
+ if (mask) {
+ val = phy_read(phydev, regnum);
+ if (val < 0) {
+ ret = val;
+ goto err;
+ }
+ val &= mask;
+ }
+ val |= val_bits;
+
+ ret = phy_write(phydev, regnum, val);
+ if (ret < 0)
+ goto err;
+
+ }
+err:
+ return ret;
+}
+#else
+static int bcm8706_of_reg_init(struct phy_device *phydev)
+{
+ return 0;
+}
+#endif /* CONFIG_OF_MDIO */
+
+static int bcm8706_config_init(struct phy_device *phydev)
+{
+ phydev->supported = SUPPORTED_10000baseR_FEC;
+ phydev->advertising = ADVERTISED_10000baseR_FEC;
+ phydev->state = PHY_NOLINK;
+
+ bcm8706_of_reg_init(phydev);
+
+ return 0;
+}
+
+static int bcm8706_config_aneg(struct phy_device *phydev)
+{
+ return -EINVAL;
+}
+
+static int bcm8706_read_status(struct phy_device *phydev)
+{
+ int rx_signal_detect;
+ int pcs_status;
+ int xgxs_lane_status;
+
+ rx_signal_detect = phy_read(phydev, BCM8706_PMD_RX_SIGNAL_DETECT);
+ if (rx_signal_detect < 0)
+ return rx_signal_detect;
+
+ if ((rx_signal_detect & 1) == 0)
+ goto no_link;
+
+ pcs_status = phy_read(phydev, BCM8706_10GBASER_PCS_STATUS);
+ if (pcs_status < 0)
+ return pcs_status;
+
+ if ((pcs_status & 1) == 0)
+ goto no_link;
+
+ xgxs_lane_status = phy_read(phydev, BCM8706_XGXS_LANE_STATUS);
+ if (xgxs_lane_status < 0)
+ return xgxs_lane_status;
+
+ if ((xgxs_lane_status & 0x1000) == 0)
+ goto no_link;
+
+ phydev->speed = 10000;
+ phydev->link = 1;
+ phydev->duplex = 1;
+ return 0;
+
+no_link:
+ phydev->link = 0;
+ return 0;
+}
+
+static int bcm8706_config_intr(struct phy_device *phydev)
+{
+ int reg, err;
+
+ reg = phy_read(phydev, BCM8706_LASI_CONTROL);
+
+ if (reg < 0)
+ return reg;
+
+ if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
+ reg |= 1;
+ else
+ reg &= ~1;
+
+ err = phy_write(phydev, BCM8706_LASI_CONTROL, reg);
+ return err;
+}
+
+static int bcm8706_did_interrupt(struct phy_device *phydev)
+{
+ int reg;
+
+ reg = phy_read(phydev, BCM8706_LASI_STATUS);
+
+ if (reg < 0) {
+ dev_err(&phydev->dev,
+ "Error: Read of BCM8706_LASI_STATUS failed: %d\n", reg);
+ return 0;
+ }
+ return (reg & 1) != 0;
+}
+
+static int bcm8706_ack_interrupt(struct phy_device *phydev)
+{
+ /* Reading the LASI status clears it. */
+ bcm8706_did_interrupt(phydev);
+ return 0;
+}
+
+
+static struct phy_driver bcm8706_driver = {
+ .phy_id = PHY_ID_BCM8706,
+ .phy_id_mask = 0xffffffff,
+ .name = "Broadcom BCM8706",
+ .flags = PHY_HAS_INTERRUPT,
+ .config_init = bcm8706_config_init,
+ .config_aneg = bcm8706_config_aneg,
+ .read_status = bcm8706_read_status,
+ .ack_interrupt = bcm8706_ack_interrupt,
+ .config_intr = bcm8706_config_intr,
+ .did_interrupt = bcm8706_did_interrupt,
+ .driver = { .owner = THIS_MODULE },
+};
+
+static int __init bcm8706_init(void)
+{
+ int ret;
+
+ ret = phy_driver_register(&bcm8706_driver);
+
+ return ret;
+}
+module_init(bcm8706_init);
+
+static void __exit bcm8706_exit(void)
+{
+ phy_driver_unregister(&bcm8706_driver);
+}
+module_exit(bcm8706_exit);
+
+static struct mdio_device_id __maybe_unused bcm8706_tbl[] = {
+ { PHY_ID_BCM8706, 0xffffffff },
+ { }
+};
+
+MODULE_DEVICE_TABLE(mdio, bcm8706_tbl);
diff --git a/include/linux/brcmphy.h b/include/linux/brcmphy.h
index b840a49..e06a56a 100644
--- a/include/linux/brcmphy.h
+++ b/include/linux/brcmphy.h
@@ -9,6 +9,7 @@
#define PHY_ID_BCM5464 0x002060b0
#define PHY_ID_BCM5461 0x002060c0
#define PHY_ID_BCM57780 0x03625d90
+#define PHY_ID_BCM8706 0x0143bdc1

#define PHY_BCM_OUI_MASK 0xfffffc00
#define PHY_BCM_OUI_1 0x00206000
--
1.7.2.3


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