--- /dev/null
+/*
+ * Copyright (C) 2017
+ * Broadcom
+ * Florian Fainelli <f.fainelli@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+/*
+ * PHY driver for Broadcom BCM53xx (roboswitch) Ethernet switches.
+ *
+ * This driver configures the b53 for basic use as a PHY. The switch supports
+ * vendor tags and VLAN configuration that can affect the switching decisions.
+ * This driver uses a simple configuration in which all ports are only allowed
+ * to send frames to the CPU port and receive frames from the CPU port this
+ * providing port isolation (no cross talk).
+ *
+ * The configuration determines which PHY ports to activate using the
+ * CONFIG_B53_PHY_PORTS bitmask. Set bit N will active port N and so on.
+ *
+ * This driver was written primarily for the Lamobo R1 platform using a BCM53152
+ * switch but the BCM53xx being largely register compatible, extending it to
+ * cover other switches would be trivial.
+ */
+
+#include <common.h>
+
+#include <errno.h>
+#include <malloc.h>
+#include <miiphy.h>
+#include <netdev.h>
+
+/* Pseudo-PHY address (non configurable) to access internal registers */
+#define BRCM_PSEUDO_PHY_ADDR 30
+
+/* Maximum number of ports possible */
+#define B53_N_PORTS 9
+
+#define B53_CTRL_PAGE 0x00 /* Control */
+#define B53_MGMT_PAGE 0x02 /* Management Mode */
+/* Port VLAN Page */
+#define B53_PVLAN_PAGE 0x31
+
+/* Control Page registers */
+#define B53_PORT_CTRL(i) (0x00 + (i))
+#define PORT_CTRL_RX_DISABLE BIT(0)
+#define PORT_CTRL_TX_DISABLE BIT(1)
+#define PORT_CTRL_RX_BCST_EN BIT(2) /* Broadcast RX (P8 only) */
+#define PORT_CTRL_RX_MCST_EN BIT(3) /* Multicast RX (P8 only) */
+#define PORT_CTRL_RX_UCST_EN BIT(4) /* Unicast RX (P8 only) */
+
+/* Switch Mode Control Register (8 bit) */
+#define B53_SWITCH_MODE 0x0b
+#define SM_SW_FWD_MODE BIT(0) /* 1 = Managed Mode */
+#define SM_SW_FWD_EN BIT(1) /* Forwarding Enable */
+
+/* IMP Port state override register (8 bit) */
+#define B53_PORT_OVERRIDE_CTRL 0x0e
+#define PORT_OVERRIDE_LINK BIT(0)
+#define PORT_OVERRIDE_FULL_DUPLEX BIT(1) /* 0 = Half Duplex */
+#define PORT_OVERRIDE_SPEED_S 2
+#define PORT_OVERRIDE_SPEED_10M (0 << PORT_OVERRIDE_SPEED_S)
+#define PORT_OVERRIDE_SPEED_100M (1 << PORT_OVERRIDE_SPEED_S)
+#define PORT_OVERRIDE_SPEED_1000M (2 << PORT_OVERRIDE_SPEED_S)
+/* BCM5325 only */
+#define PORT_OVERRIDE_RV_MII_25 BIT(4)
+#define PORT_OVERRIDE_RX_FLOW BIT(4)
+#define PORT_OVERRIDE_TX_FLOW BIT(5)
+/* BCM5301X only, requires setting 1000M */
+#define PORT_OVERRIDE_SPEED_2000M BIT(6)
+#define PORT_OVERRIDE_EN BIT(7) /* Use the register contents */
+
+#define B53_RGMII_CTRL_IMP 0x60
+#define RGMII_CTRL_ENABLE_GMII BIT(7)
+#define RGMII_CTRL_TIMING_SEL BIT(2)
+#define RGMII_CTRL_DLL_RXC BIT(1)
+#define RGMII_CTRL_DLL_TXC BIT(0)
+
+/* Switch control (8 bit) */
+#define B53_SWITCH_CTRL 0x22
+#define B53_MII_DUMB_FWDG_EN BIT(6)
+
+/* Software reset register (8 bit) */
+#define B53_SOFTRESET 0x79
+#define SW_RST BIT(7)
+#define EN_CH_RST BIT(6)
+#define EN_SW_RST BIT(4)
+
+/* Fast Aging Control register (8 bit) */
+#define B53_FAST_AGE_CTRL 0x88
+#define FAST_AGE_STATIC BIT(0)
+#define FAST_AGE_DYNAMIC BIT(1)
+#define FAST_AGE_PORT BIT(2)
+#define FAST_AGE_VLAN BIT(3)
+#define FAST_AGE_STP BIT(4)
+#define FAST_AGE_MC BIT(5)
+#define FAST_AGE_DONE BIT(7)
+
+/* Port VLAN mask (16 bit) IMP port is always 8, also on 5325 & co */
+#define B53_PVLAN_PORT_MASK(i) ((i) * 2)
+
+/* MII registers */
+#define REG_MII_PAGE 0x10 /* MII Page register */
+#define REG_MII_ADDR 0x11 /* MII Address register */
+#define REG_MII_DATA0 0x18 /* MII Data register 0 */
+#define REG_MII_DATA1 0x19 /* MII Data register 1 */
+#define REG_MII_DATA2 0x1a /* MII Data register 2 */
+#define REG_MII_DATA3 0x1b /* MII Data register 3 */
+
+#define REG_MII_PAGE_ENABLE BIT(0)
+#define REG_MII_ADDR_WRITE BIT(0)
+#define REG_MII_ADDR_READ BIT(1)
+
+struct b53_device {
+ struct mii_dev *bus;
+ unsigned int cpu_port;
+};
+
+static int b53_mdio_op(struct mii_dev *bus, u8 page, u8 reg, u16 op)
+{
+ int ret;
+ int i;
+ u16 v;
+
+ /* set page number */
+ v = (page << 8) | REG_MII_PAGE_ENABLE;
+ ret = bus->write(bus, BRCM_PSEUDO_PHY_ADDR, MDIO_DEVAD_NONE,
+ REG_MII_PAGE, v);
+ if (ret)
+ return ret;
+
+ /* set register address */
+ v = (reg << 8) | op;
+ ret = bus->write(bus, BRCM_PSEUDO_PHY_ADDR, MDIO_DEVAD_NONE,
+ REG_MII_ADDR, v);
+ if (ret)
+ return ret;
+
+ /* check if operation completed */
+ for (i = 0; i < 5; ++i) {
+ v = bus->read(bus, BRCM_PSEUDO_PHY_ADDR, MDIO_DEVAD_NONE,
+ REG_MII_ADDR);
+ if (!(v & (REG_MII_ADDR_WRITE | REG_MII_ADDR_READ)))
+ break;
+
+ udelay(100);
+ }
+
+ if (i == 5)
+ return -EIO;
+
+ return 0;
+}
+
+static int b53_mdio_read8(struct mii_dev *bus, u8 page, u8 reg, u8 *val)
+{
+ int ret;
+
+ ret = b53_mdio_op(bus, page, reg, REG_MII_ADDR_READ);
+ if (ret)
+ return ret;
+
+ *val = bus->read(bus, BRCM_PSEUDO_PHY_ADDR, MDIO_DEVAD_NONE,
+ REG_MII_DATA0) & 0xff;
+
+ return 0;
+}
+
+static int b53_mdio_read16(struct mii_dev *bus, u8 page, u8 reg, u16 *val)
+{
+ int ret;
+
+ ret = b53_mdio_op(bus, page, reg, REG_MII_ADDR_READ);
+ if (ret)
+ return ret;
+
+ *val = bus->read(bus, BRCM_PSEUDO_PHY_ADDR, MDIO_DEVAD_NONE,
+ REG_MII_DATA0);
+
+ return 0;
+}
+
+static int b53_mdio_read32(struct mii_dev *bus, u8 page, u8 reg, u32 *val)
+{
+ int ret;
+
+ ret = b53_mdio_op(bus, page, reg, REG_MII_ADDR_READ);
+ if (ret)
+ return ret;
+
+ *val = bus->read(bus, BRCM_PSEUDO_PHY_ADDR, MDIO_DEVAD_NONE,
+ REG_MII_DATA0);
+ *val |= bus->read(bus, BRCM_PSEUDO_PHY_ADDR, MDIO_DEVAD_NONE,
+ REG_MII_DATA1) << 16;
+
+ return 0;
+}
+
+static int b53_mdio_read48(struct mii_dev *bus, u8 page, u8 reg, u64 *val)
+{
+ u64 temp = 0;
+ int i;
+ int ret;
+
+ ret = b53_mdio_op(bus, page, reg, REG_MII_ADDR_READ);
+ if (ret)
+ return ret;
+
+ for (i = 2; i >= 0; i--) {
+ temp <<= 16;
+ temp |= bus->read(bus, BRCM_PSEUDO_PHY_ADDR, MDIO_DEVAD_NONE,
+ REG_MII_DATA0 + i);
+ }
+
+ *val = temp;
+
+ return 0;
+}
+
+static int b53_mdio_read64(struct mii_dev *bus, u8 page, u8 reg, u64 *val)
+{
+ u64 temp = 0;
+ int i;
+ int ret;
+
+ ret = b53_mdio_op(bus, page, reg, REG_MII_ADDR_READ);
+ if (ret)
+ return ret;
+
+ for (i = 3; i >= 0; i--) {
+ temp <<= 16;
+ temp |= bus->read(bus, BRCM_PSEUDO_PHY_ADDR, MDIO_DEVAD_NONE,
+ REG_MII_DATA0 + i);
+ }
+
+ *val = temp;
+
+ return 0;
+}
+
+static int b53_mdio_write8(struct mii_dev *bus, u8 page, u8 reg, u8 value)
+{
+ int ret;
+
+ ret = bus->write(bus, BRCM_PSEUDO_PHY_ADDR, MDIO_DEVAD_NONE,
+ REG_MII_DATA0, value);
+ if (ret)
+ return ret;
+
+ return b53_mdio_op(bus, page, reg, REG_MII_ADDR_WRITE);
+}
+
+static int b53_mdio_write16(struct mii_dev *bus, u8 page, u8 reg,
+ u16 value)
+{
+ int ret;
+
+ ret = bus->write(bus, BRCM_PSEUDO_PHY_ADDR, MDIO_DEVAD_NONE,
+ REG_MII_DATA0, value);
+ if (ret)
+ return ret;
+
+ return b53_mdio_op(bus, page, reg, REG_MII_ADDR_WRITE);
+}
+
+static int b53_mdio_write32(struct mii_dev *bus, u8 page, u8 reg,
+ u32 value)
+{
+ unsigned int i;
+ u32 temp = value;
+
+ for (i = 0; i < 2; i++) {
+ int ret = bus->write(bus, BRCM_PSEUDO_PHY_ADDR,
+ MDIO_DEVAD_NONE,
+ REG_MII_DATA0 + i, temp & 0xffff);
+ if (ret)
+ return ret;
+ temp >>= 16;
+ }
+
+ return b53_mdio_op(bus, page, reg, REG_MII_ADDR_WRITE);
+}
+
+static int b53_mdio_write48(struct mii_dev *bus, u8 page, u8 reg,
+ u64 value)
+{
+ unsigned int i;
+ u64 temp = value;
+
+ for (i = 0; i < 3; i++) {
+ int ret = bus->write(bus, BRCM_PSEUDO_PHY_ADDR,
+ MDIO_DEVAD_NONE,
+ REG_MII_DATA0 + i, temp & 0xffff);
+ if (ret)
+ return ret;
+ temp >>= 16;
+ }
+
+ return b53_mdio_op(bus, page, reg, REG_MII_ADDR_WRITE);
+}
+
+static int b53_mdio_write64(struct mii_dev *bus, u8 page, u8 reg,
+ u64 value)
+{
+ unsigned int i;
+ u64 temp = value;
+
+ for (i = 0; i < 4; i++) {
+ int ret = bus->write(bus, BRCM_PSEUDO_PHY_ADDR,
+ MDIO_DEVAD_NONE,
+ REG_MII_DATA0 + i, temp & 0xffff);
+ if (ret)
+ return ret;
+ temp >>= 16;
+ }
+
+ return b53_mdio_op(bus, page, reg, REG_MII_ADDR_WRITE);
+}
+
+static inline int b53_read8(struct b53_device *dev, u8 page,
+ u8 reg, u8 *value)
+{
+ return b53_mdio_read8(dev->bus, page, reg, value);
+}
+
+static inline int b53_read16(struct b53_device *dev, u8 page,
+ u8 reg, u16 *value)
+{
+ return b53_mdio_read16(dev->bus, page, reg, value);
+}
+
+static inline int b53_read32(struct b53_device *dev, u8 page,
+ u8 reg, u32 *value)
+{
+ return b53_mdio_read32(dev->bus, page, reg, value);
+}
+
+static inline int b53_read48(struct b53_device *dev, u8 page,
+ u8 reg, u64 *value)
+{
+ return b53_mdio_read48(dev->bus, page, reg, value);
+}
+
+static inline int b53_read64(struct b53_device *dev, u8 page,
+ u8 reg, u64 *value)
+{
+ return b53_mdio_read64(dev->bus, page, reg, value);
+}
+
+static inline int b53_write8(struct b53_device *dev, u8 page,
+ u8 reg, u8 value)
+{
+ return b53_mdio_write8(dev->bus, page, reg, value);
+}
+
+static inline int b53_write16(struct b53_device *dev, u8 page,
+ u8 reg, u16 value)
+{
+ return b53_mdio_write16(dev->bus, page, reg, value);
+}
+
+static inline int b53_write32(struct b53_device *dev, u8 page,
+ u8 reg, u32 value)
+{
+ return b53_mdio_write32(dev->bus, page, reg, value);
+}
+
+static inline int b53_write48(struct b53_device *dev, u8 page,
+ u8 reg, u64 value)
+{
+ return b53_mdio_write48(dev->bus, page, reg, value);
+}
+
+static inline int b53_write64(struct b53_device *dev, u8 page,
+ u8 reg, u64 value)
+{
+ return b53_mdio_write64(dev->bus, page, reg, value);
+}
+
+static int b53_flush_arl(struct b53_device *dev, u8 mask)
+{
+ unsigned int i;
+
+ b53_write8(dev, B53_CTRL_PAGE, B53_FAST_AGE_CTRL,
+ FAST_AGE_DONE | FAST_AGE_DYNAMIC | mask);
+
+ for (i = 0; i < 10; i++) {
+ u8 fast_age_ctrl;
+
+ b53_read8(dev, B53_CTRL_PAGE, B53_FAST_AGE_CTRL,
+ &fast_age_ctrl);
+
+ if (!(fast_age_ctrl & FAST_AGE_DONE))
+ goto out;
+
+ mdelay(1);
+ }
+
+ return -ETIMEDOUT;
+out:
+ /* Only age dynamic entries (default behavior) */
+ b53_write8(dev, B53_CTRL_PAGE, B53_FAST_AGE_CTRL, FAST_AGE_DYNAMIC);
+ return 0;
+}
+
+static int b53_switch_reset(struct phy_device *phydev)
+{
+ struct b53_device *dev = phydev->priv;
+ unsigned int timeout = 1000;
+ u8 mgmt;
+ u8 reg;
+
+ b53_read8(dev, B53_CTRL_PAGE, B53_SOFTRESET, ®);
+ reg |= SW_RST | EN_SW_RST | EN_CH_RST;
+ b53_write8(dev, B53_CTRL_PAGE, B53_SOFTRESET, reg);
+
+ do {
+ b53_read8(dev, B53_CTRL_PAGE, B53_SOFTRESET, ®);
+ if (!(reg & SW_RST))
+ break;
+
+ mdelay(1);
+ } while (timeout-- > 0);
+
+ if (timeout == 0)
+ return -ETIMEDOUT;
+
+ b53_read8(dev, B53_CTRL_PAGE, B53_SWITCH_MODE, &mgmt);
+
+ if (!(mgmt & SM_SW_FWD_EN)) {
+ mgmt &= ~SM_SW_FWD_MODE;
+ mgmt |= SM_SW_FWD_EN;
+
+ b53_write8(dev, B53_CTRL_PAGE, B53_SWITCH_MODE, mgmt);
+ b53_read8(dev, B53_CTRL_PAGE, B53_SWITCH_MODE, &mgmt);
+
+ if (!(mgmt & SM_SW_FWD_EN)) {
+ printf("Failed to enable switch!\n");
+ return -EINVAL;
+ }
+ }
+
+ /* Include IMP port in dumb forwarding mode when no tagging protocol
+ * is configured
+ */
+ b53_read8(dev, B53_CTRL_PAGE, B53_SWITCH_CTRL, &mgmt);
+ mgmt |= B53_MII_DUMB_FWDG_EN;
+ b53_write8(dev, B53_CTRL_PAGE, B53_SWITCH_CTRL, mgmt);
+
+ return b53_flush_arl(dev, FAST_AGE_STATIC);
+}
+
+static void b53_enable_cpu_port(struct phy_device *phydev)
+{
+ struct b53_device *dev = phydev->priv;
+ u8 port_ctrl;
+
+ port_ctrl = PORT_CTRL_RX_BCST_EN |
+ PORT_CTRL_RX_MCST_EN |
+ PORT_CTRL_RX_UCST_EN;
+ b53_write8(dev, B53_CTRL_PAGE, B53_PORT_CTRL(dev->cpu_port), port_ctrl);
+
+ port_ctrl = PORT_OVERRIDE_EN | PORT_OVERRIDE_LINK |
+ PORT_OVERRIDE_FULL_DUPLEX | PORT_OVERRIDE_SPEED_1000M;
+ b53_write8(dev, B53_CTRL_PAGE, B53_PORT_OVERRIDE_CTRL, port_ctrl);
+
+ b53_read8(dev, B53_CTRL_PAGE, B53_RGMII_CTRL_IMP, &port_ctrl);
+}
+
+static void b53_imp_vlan_setup(struct b53_device *dev, int cpu_port)
+{
+ unsigned int port;
+ u16 pvlan;
+
+ /* Enable the IMP port to be in the same VLAN as the other ports
+ * on a per-port basis such that we only have Port i and IMP in
+ * the same VLAN.
+ */
+ for (port = 0; port < B53_N_PORTS; port++) {
+ if (!((1 << port) & CONFIG_B53_PHY_PORTS))
+ continue;
+
+ b53_read16(dev, B53_PVLAN_PAGE, B53_PVLAN_PORT_MASK(port),
+ &pvlan);
+ pvlan |= BIT(cpu_port);
+ b53_write16(dev, B53_PVLAN_PAGE, B53_PVLAN_PORT_MASK(port),
+ pvlan);
+ }
+}
+
+static int b53_port_enable(struct phy_device *phydev, unsigned int port)
+{
+ struct b53_device *dev = phydev->priv;
+ unsigned int cpu_port = dev->cpu_port;
+ u16 pvlan;
+
+ /* Clear the Rx and Tx disable bits and set to no spanning tree */
+ b53_write8(dev, B53_CTRL_PAGE, B53_PORT_CTRL(port), 0);
+
+ /* Set this port, and only this one to be in the default VLAN */
+ b53_read16(dev, B53_PVLAN_PAGE, B53_PVLAN_PORT_MASK(port), &pvlan);
+ pvlan &= ~0x1ff;
+ pvlan |= BIT(port);
+ b53_write16(dev, B53_PVLAN_PAGE, B53_PVLAN_PORT_MASK(port), pvlan);
+
+ b53_imp_vlan_setup(dev, cpu_port);
+
+ return 0;
+}
+
+static int b53_switch_init(struct phy_device *phydev)
+{
+ static int init;
+ int ret;
+
+ if (init)
+ return 0;
+
+ ret = b53_switch_reset(phydev);
+ if (ret < 0)
+ return ret;
+
+ b53_enable_cpu_port(phydev);
+
+ init = 1;
+
+ return 0;
+}
+
+static int b53_probe(struct phy_device *phydev)
+{
+ struct b53_device *dev;
+ int ret;
+
+ dev = malloc(sizeof(*dev));
+ if (!dev)
+ return -ENOMEM;
+
+ memset(dev, 0, sizeof(*dev));
+
+ phydev->priv = dev;
+ dev->bus = phydev->bus;
+ dev->cpu_port = CONFIG_B53_CPU_PORT;
+
+ ret = b53_switch_reset(phydev);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int b53_phy_config(struct phy_device *phydev)
+{
+ unsigned int port;
+ int res;
+
+ res = b53_switch_init(phydev);
+ if (res < 0)
+ return res;
+
+ for (port = 0; port < B53_N_PORTS; port++) {
+ if (!((1 << port) & CONFIG_B53_PHY_PORTS))
+ continue;
+
+ res = b53_port_enable(phydev, port);
+ if (res < 0) {
+ printf("Error enabling port %i\n", port);
+ continue;
+ }
+
+ res = genphy_config_aneg(phydev);
+ if (res < 0) {
+ printf("Error setting PHY %i autoneg\n", port);
+ continue;
+ }
+
+ res = 0;
+ }
+
+ return res;
+}
+
+static int b53_phy_startup(struct phy_device *phydev)
+{
+ unsigned int port;
+ int res;
+
+ for (port = 0; port < B53_N_PORTS; port++) {
+ if (!((1 << port) & CONFIG_B53_PHY_PORTS))
+ continue;
+
+ phydev->addr = port;
+
+ res = genphy_startup(phydev);
+ if (res < 0)
+ continue;
+ else
+ break;
+ }
+
+ /* Since we are connected directly to the switch, hardcode the link
+ * parameters to match those of the CPU port configured in
+ * b53_enable_cpu_port, we cannot be dependent on the user-facing port
+ * settings (e.g: 100Mbits/sec would not work here)
+ */
+ phydev->speed = 1000;
+ phydev->duplex = 1;
+ phydev->link = 1;
+
+ return 0;
+}
+
+static struct phy_driver b53_driver = {
+ .name = "Broadcom BCM53125",
+ .uid = 0x03625c00,
+ .mask = 0xfffffc00,
+ .features = PHY_GBIT_FEATURES,
+ .probe = b53_probe,
+ .config = b53_phy_config,
+ .startup = b53_phy_startup,
+ .shutdown = &genphy_shutdown,
+};
+
+int phy_b53_init(void)
+{
+ phy_register(&b53_driver);
+
+ return 0;
+}
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