// SPDX-License-Identifier: GPL-2.0
/* Realtek SMI subdriver for the Realtek RTL8366RB ethernet switch
 *
 * This is a sparsely documented chip, the only viable documentation seems
 * to be a patched up code drop from the vendor that appear in various
 * GPL source trees.
 *
 * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
 * Copyright (C) 2009-2010 Gabor Juhos <juhosg@openwrt.org>
 * Copyright (C) 2010 Antti Seppälä <a.seppala@gmail.com>
 * Copyright (C) 2010 Roman Yeryomin <roman@advem.lv>
 * Copyright (C) 2011 Colin Leitner <colin.leitner@googlemail.com>
 */

#include <linux/bitops.h>
#include <linux/etherdevice.h>
#include <linux/if_bridge.h>
#include <linux/if_vlan.h>
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/of_irq.h>
#include <linux/regmap.h>
#include <linux/string_choices.h>

#include "realtek.h"
#include "realtek-smi.h"
#include "realtek-mdio.h"
#include "rtl83xx.h"
#include "rtl8366rb.h"

/* Switch Global Configuration register */
#define RTL8366RB_SGCR                          0x0000
#define RTL8366RB_SGCR_EN_BC_STORM_CTRL         BIT(0)
#define RTL8366RB_SGCR_MAX_LENGTH(a)            ((a) << 4)
#define RTL8366RB_SGCR_MAX_LENGTH_MASK          RTL8366RB_SGCR_MAX_LENGTH(0x3)
#define RTL8366RB_SGCR_MAX_LENGTH_1522          RTL8366RB_SGCR_MAX_LENGTH(0x0)
#define RTL8366RB_SGCR_MAX_LENGTH_1536          RTL8366RB_SGCR_MAX_LENGTH(0x1)
#define RTL8366RB_SGCR_MAX_LENGTH_1552          RTL8366RB_SGCR_MAX_LENGTH(0x2)
#define RTL8366RB_SGCR_MAX_LENGTH_16000         RTL8366RB_SGCR_MAX_LENGTH(0x3)
#define RTL8366RB_SGCR_EN_VLAN                  BIT(13)
#define RTL8366RB_SGCR_EN_VLAN_4KTB             BIT(14)

/* Port Enable Control register */
#define RTL8366RB_PECR                          0x0001

/* Switch per-port learning disablement register */
#define RTL8366RB_PORT_LEARNDIS_CTRL            0x0002

/* Security control, actually aging register */
#define RTL8366RB_SECURITY_CTRL                 0x0003

#define RTL8366RB_SSCR2                         0x0004
#define RTL8366RB_SSCR2_DROP_UNKNOWN_DA         BIT(0)

/* Port Mode Control registers */
#define RTL8366RB_PMC0                          0x0005
#define RTL8366RB_PMC0_SPI                      BIT(0)
#define RTL8366RB_PMC0_EN_AUTOLOAD              BIT(1)
#define RTL8366RB_PMC0_PROBE                    BIT(2)
#define RTL8366RB_PMC0_DIS_BISR                 BIT(3)
#define RTL8366RB_PMC0_ADCTEST                  BIT(4)
#define RTL8366RB_PMC0_SRAM_DIAG                BIT(5)
#define RTL8366RB_PMC0_EN_SCAN                  BIT(6)
#define RTL8366RB_PMC0_P4_IOMODE_SHIFT          7
#define RTL8366RB_PMC0_P4_IOMODE_MASK           GENMASK(9, 7)
#define RTL8366RB_PMC0_P5_IOMODE_SHIFT          10
#define RTL8366RB_PMC0_P5_IOMODE_MASK           GENMASK(12, 10)
#define RTL8366RB_PMC0_SDSMODE_SHIFT            13
#define RTL8366RB_PMC0_SDSMODE_MASK             GENMASK(15, 13)
#define RTL8366RB_PMC1                          0x0006

/* Port Mirror Control Register */
#define RTL8366RB_PMCR                          0x0007
#define RTL8366RB_PMCR_SOURCE_PORT(a)           (a)
#define RTL8366RB_PMCR_SOURCE_PORT_MASK         0x000f
#define RTL8366RB_PMCR_MONITOR_PORT(a)          ((a) << 4)
#define RTL8366RB_PMCR_MONITOR_PORT_MASK        0x00f0
#define RTL8366RB_PMCR_MIRROR_RX                BIT(8)
#define RTL8366RB_PMCR_MIRROR_TX                BIT(9)
#define RTL8366RB_PMCR_MIRROR_SPC               BIT(10)
#define RTL8366RB_PMCR_MIRROR_ISO               BIT(11)

/* bits 0..7 = port 0, bits 8..15 = port 1 */
#define RTL8366RB_PAACR0                0x0010
/* bits 0..7 = port 2, bits 8..15 = port 3 */
#define RTL8366RB_PAACR1                0x0011
/* bits 0..7 = port 4, bits 8..15 = port 5 */
#define RTL8366RB_PAACR2                0x0012
#define RTL8366RB_PAACR_SPEED_10M       0
#define RTL8366RB_PAACR_SPEED_100M      1
#define RTL8366RB_PAACR_SPEED_1000M     2
#define RTL8366RB_PAACR_FULL_DUPLEX     BIT(2)
#define RTL8366RB_PAACR_LINK_UP         BIT(4)
#define RTL8366RB_PAACR_TX_PAUSE        BIT(5)
#define RTL8366RB_PAACR_RX_PAUSE        BIT(6)
#define RTL8366RB_PAACR_AN              BIT(7)

/* bits 0..7 = port 0, bits 8..15 = port 1 */
#define RTL8366RB_PSTAT0                0x0014
/* bits 0..7 = port 2, bits 8..15 = port 3 */
#define RTL8366RB_PSTAT1                0x0015
/* bits 0..7 = port 4, bits 8..15 = port 5 */
#define RTL8366RB_PSTAT2                0x0016

#define RTL8366RB_POWER_SAVING_REG      0x0021

/* Spanning tree status (STP) control, two bits per port per FID */
#define RTL8366RB_STP_STATE_BASE        0x0050 /* 0x0050..0x0057 */
#define RTL8366RB_STP_STATE_DISABLED    0x0
#define RTL8366RB_STP_STATE_BLOCKING    0x1
#define RTL8366RB_STP_STATE_LEARNING    0x2
#define RTL8366RB_STP_STATE_FORWARDING  0x3
#define RTL8366RB_STP_MASK              GENMASK(1, 0)
#define RTL8366RB_STP_STATE(port, state) \
        ((state) << ((port) * 2))
#define RTL8366RB_STP_STATE_MASK(port) \
        RTL8366RB_STP_STATE((port), RTL8366RB_STP_MASK)

/* CPU port control reg */
#define RTL8366RB_CPU_CTRL_REG          0x0061
#define RTL8366RB_CPU_PORTS_MSK         0x00FF
/* Disables inserting custom tag length/type 0x8899 */
#define RTL8366RB_CPU_NO_TAG            BIT(15)
#define RTL8366RB_CPU_TAG_SIZE          4

#define RTL8366RB_SMAR0                 0x0070 /* bits 0..15 */
#define RTL8366RB_SMAR1                 0x0071 /* bits 16..31 */
#define RTL8366RB_SMAR2                 0x0072 /* bits 32..47 */

#define RTL8366RB_RESET_CTRL_REG                0x0100
#define RTL8366RB_CHIP_CTRL_RESET_HW            BIT(0)
#define RTL8366RB_CHIP_CTRL_RESET_SW            BIT(1)

#define RTL8366RB_CHIP_ID_REG                   0x0509
#define RTL8366RB_CHIP_ID_8366                  0x5937
#define RTL8366RB_CHIP_VERSION_CTRL_REG         0x050A
#define RTL8366RB_CHIP_VERSION_MASK             0xf

/* PHY registers control */
#define RTL8366RB_PHY_ACCESS_CTRL_REG           0x8000
#define RTL8366RB_PHY_CTRL_READ                 BIT(0)
#define RTL8366RB_PHY_CTRL_WRITE                0
#define RTL8366RB_PHY_ACCESS_BUSY_REG           0x8001
#define RTL8366RB_PHY_INT_BUSY                  BIT(0)
#define RTL8366RB_PHY_EXT_BUSY                  BIT(4)
#define RTL8366RB_PHY_ACCESS_DATA_REG           0x8002
#define RTL8366RB_PHY_EXT_CTRL_REG              0x8010
#define RTL8366RB_PHY_EXT_WRDATA_REG            0x8011
#define RTL8366RB_PHY_EXT_RDDATA_REG            0x8012

#define RTL8366RB_PHY_REG_MASK                  0x1f
#define RTL8366RB_PHY_PAGE_OFFSET               5
#define RTL8366RB_PHY_PAGE_MASK                 (0xf << 5)
#define RTL8366RB_PHY_NO_OFFSET                 9
#define RTL8366RB_PHY_NO_MASK                   (0x1f << 9)

/* VLAN Ingress Control Register 1, one bit per port.
 * bit 0 .. 5 will make the switch drop ingress frames without
 * VID such as untagged or priority-tagged frames for respective
 * port.
 * bit 6 .. 11 will make the switch drop ingress frames carrying
 * a C-tag with VID != 0 for respective port.
 */
#define RTL8366RB_VLAN_INGRESS_CTRL1_REG        0x037E
#define RTL8366RB_VLAN_INGRESS_CTRL1_DROP(port) (BIT((port)) | BIT((port) + 6))

/* VLAN Ingress Control Register 2, one bit per port.
 * bit0 .. bit5 will make the switch drop all ingress frames with
 * a VLAN classification that does not include the port is in its
 * member set.
 */
#define RTL8366RB_VLAN_INGRESS_CTRL2_REG        0x037f

#define RTL8366RB_MIB_COUNT                     33
#define RTL8366RB_GLOBAL_MIB_COUNT              1
#define RTL8366RB_MIB_COUNTER_PORT_OFFSET       0x0050
#define RTL8366RB_MIB_COUNTER_BASE              0x1000
#define RTL8366RB_MIB_CTRL_REG                  0x13F0
#define RTL8366RB_MIB_CTRL_USER_MASK            0x0FFC
#define RTL8366RB_MIB_CTRL_BUSY_MASK            BIT(0)
#define RTL8366RB_MIB_CTRL_RESET_MASK           BIT(1)
#define RTL8366RB_MIB_CTRL_PORT_RESET(_p)       BIT(2 + (_p))
#define RTL8366RB_MIB_CTRL_GLOBAL_RESET         BIT(11)

#define RTL8366RB_PORT_VLAN_CTRL_BASE           0x0063
#define RTL8366RB_PORT_VLAN_CTRL_REG(_p)  \
                (RTL8366RB_PORT_VLAN_CTRL_BASE + (_p) / 4)
#define RTL8366RB_PORT_VLAN_CTRL_MASK           0xf
#define RTL8366RB_PORT_VLAN_CTRL_SHIFT(_p)      (4 * ((_p) % 4))

#define RTL8366RB_VLAN_TABLE_READ_BASE          0x018C
#define RTL8366RB_VLAN_TABLE_WRITE_BASE         0x0185

#define RTL8366RB_TABLE_ACCESS_CTRL_REG         0x0180
#define RTL8366RB_TABLE_VLAN_READ_CTRL          0x0E01
#define RTL8366RB_TABLE_VLAN_WRITE_CTRL         0x0F01

#define RTL8366RB_VLAN_MC_BASE(_x)              (0x0020 + (_x) * 3)

#define RTL8366RB_PORT_LINK_STATUS_BASE         0x0014
#define RTL8366RB_PORT_STATUS_SPEED_MASK        0x0003
#define RTL8366RB_PORT_STATUS_DUPLEX_MASK       0x0004
#define RTL8366RB_PORT_STATUS_LINK_MASK         0x0010
#define RTL8366RB_PORT_STATUS_TXPAUSE_MASK      0x0020
#define RTL8366RB_PORT_STATUS_RXPAUSE_MASK      0x0040
#define RTL8366RB_PORT_STATUS_AN_MASK           0x0080

#define RTL8366RB_NUM_VLANS             16
#define RTL8366RB_NUM_VIDS              4096
#define RTL8366RB_PRIORITYMAX           7
#define RTL8366RB_NUM_FIDS              8
#define RTL8366RB_FIDMAX                7

#define RTL8366RB_PORT_1                BIT(0) /* In userspace port 0 */
#define RTL8366RB_PORT_2                BIT(1) /* In userspace port 1 */
#define RTL8366RB_PORT_3                BIT(2) /* In userspace port 2 */
#define RTL8366RB_PORT_4                BIT(3) /* In userspace port 3 */
#define RTL8366RB_PORT_5                BIT(4) /* In userspace port 4 */

#define RTL8366RB_PORT_CPU              BIT(5) /* CPU port */

#define RTL8366RB_PORT_ALL              (RTL8366RB_PORT_1 |     \
                                         RTL8366RB_PORT_2 |     \
                                         RTL8366RB_PORT_3 |     \
                                         RTL8366RB_PORT_4 |     \
                                         RTL8366RB_PORT_5 |     \
                                         RTL8366RB_PORT_CPU)

#define RTL8366RB_PORT_ALL_BUT_CPU      (RTL8366RB_PORT_1 |     \
                                         RTL8366RB_PORT_2 |     \
                                         RTL8366RB_PORT_3 |     \
                                         RTL8366RB_PORT_4 |     \
                                         RTL8366RB_PORT_5)

#define RTL8366RB_PORT_ALL_EXTERNAL     (RTL8366RB_PORT_1 |     \
                                         RTL8366RB_PORT_2 |     \
                                         RTL8366RB_PORT_3 |     \
                                         RTL8366RB_PORT_4)

#define RTL8366RB_PORT_ALL_INTERNAL      RTL8366RB_PORT_CPU

/* First configuration word per member config, VID and prio */
#define RTL8366RB_VLAN_VID_MASK         0xfff
#define RTL8366RB_VLAN_PRIORITY_SHIFT   12
#define RTL8366RB_VLAN_PRIORITY_MASK    0x7
/* Second configuration word per member config, member and untagged */
#define RTL8366RB_VLAN_UNTAG_SHIFT      8
#define RTL8366RB_VLAN_UNTAG_MASK       0xff
#define RTL8366RB_VLAN_MEMBER_MASK      0xff
/* Third config word per member config, STAG currently unused */
#define RTL8366RB_VLAN_STAG_MBR_MASK    0xff
#define RTL8366RB_VLAN_STAG_MBR_SHIFT   8
#define RTL8366RB_VLAN_STAG_IDX_MASK    0x7
#define RTL8366RB_VLAN_STAG_IDX_SHIFT   5
#define RTL8366RB_VLAN_FID_MASK         0x7

/* Port ingress bandwidth control */
#define RTL8366RB_IB_BASE               0x0200
#define RTL8366RB_IB_REG(pnum)          (RTL8366RB_IB_BASE + (pnum))
#define RTL8366RB_IB_BDTH_MASK          0x3fff
#define RTL8366RB_IB_PREIFG             BIT(14)

/* Port egress bandwidth control */
#define RTL8366RB_EB_BASE               0x02d1
#define RTL8366RB_EB_REG(pnum)          (RTL8366RB_EB_BASE + (pnum))
#define RTL8366RB_EB_BDTH_MASK          0x3fff
#define RTL8366RB_EB_PREIFG_REG         0x02f8
#define RTL8366RB_EB_PREIFG             BIT(9)

#define RTL8366RB_BDTH_SW_MAX           1048512 /* 1048576? */
#define RTL8366RB_BDTH_UNIT             64
#define RTL8366RB_BDTH_REG_DEFAULT      16383

/* QOS */
#define RTL8366RB_QOS                   BIT(15)
/* Include/Exclude Preamble and IFG (20 bytes). 0:Exclude, 1:Include. */
#define RTL8366RB_QOS_DEFAULT_PREIFG    1

/* Interrupt handling */
#define RTL8366RB_INTERRUPT_CONTROL_REG 0x0440
#define RTL8366RB_INTERRUPT_POLARITY    BIT(0)
#define RTL8366RB_P4_RGMII_LED          BIT(2)
#define RTL8366RB_INTERRUPT_MASK_REG    0x0441
#define RTL8366RB_INTERRUPT_LINK_CHGALL GENMASK(11, 0)
#define RTL8366RB_INTERRUPT_ACLEXCEED   BIT(8)
#define RTL8366RB_INTERRUPT_STORMEXCEED BIT(9)
#define RTL8366RB_INTERRUPT_P4_FIBER    BIT(12)
#define RTL8366RB_INTERRUPT_P4_UTP      BIT(13)
#define RTL8366RB_INTERRUPT_VALID       (RTL8366RB_INTERRUPT_LINK_CHGALL | \
                                         RTL8366RB_INTERRUPT_ACLEXCEED | \
                                         RTL8366RB_INTERRUPT_STORMEXCEED | \
                                         RTL8366RB_INTERRUPT_P4_FIBER | \
                                         RTL8366RB_INTERRUPT_P4_UTP)
#define RTL8366RB_INTERRUPT_STATUS_REG  0x0442
#define RTL8366RB_NUM_INTERRUPT         14 /* 0..13 */

/* Port isolation registers */
#define RTL8366RB_PORT_ISO_BASE         0x0F08
#define RTL8366RB_PORT_ISO(pnum)        (RTL8366RB_PORT_ISO_BASE + (pnum))
#define RTL8366RB_PORT_ISO_EN           BIT(0)
#define RTL8366RB_PORT_ISO_PORTS_MASK   GENMASK(7, 1)
#define RTL8366RB_PORT_ISO_PORTS(pmask) ((pmask) << 1)

/* bits 0..5 enable force when cleared */
#define RTL8366RB_MAC_FORCE_CTRL_REG    0x0F11

#define RTL8366RB_OAM_PARSER_REG        0x0F14
#define RTL8366RB_OAM_MULTIPLEXER_REG   0x0F15

#define RTL8366RB_GREEN_FEATURE_REG     0x0F51
#define RTL8366RB_GREEN_FEATURE_MSK     0x0007
#define RTL8366RB_GREEN_FEATURE_TX      BIT(0)
#define RTL8366RB_GREEN_FEATURE_RX      BIT(2)

static struct rtl8366_mib_counter rtl8366rb_mib_counters[] = {
        { 0,  0, 4, "IfInOctets"                                },
        { 0,  4, 4, "EtherStatsOctets"                          },
        { 0,  8, 2, "EtherStatsUnderSizePkts"                   },
        { 0, 10, 2, "EtherFragments"                            },
        { 0, 12, 2, "EtherStatsPkts64Octets"                    },
        { 0, 14, 2, "EtherStatsPkts65to127Octets"               },
        { 0, 16, 2, "EtherStatsPkts128to255Octets"              },
        { 0, 18, 2, "EtherStatsPkts256to511Octets"              },
        { 0, 20, 2, "EtherStatsPkts512to1023Octets"             },
        { 0, 22, 2, "EtherStatsPkts1024to1518Octets"            },
        { 0, 24, 2, "EtherOversizeStats"                        },
        { 0, 26, 2, "EtherStatsJabbers"                         },
        { 0, 28, 2, "IfInUcastPkts"                             },
        { 0, 30, 2, "EtherStatsMulticastPkts"                   },
        { 0, 32, 2, "EtherStatsBroadcastPkts"                   },
        { 0, 34, 2, "EtherStatsDropEvents"                      },
        { 0, 36, 2, "Dot3StatsFCSErrors"                        },
        { 0, 38, 2, "Dot3StatsSymbolErrors"                     },
        { 0, 40, 2, "Dot3InPauseFrames"                         },
        { 0, 42, 2, "Dot3ControlInUnknownOpcodes"               },
        { 0, 44, 4, "IfOutOctets"                               },
        { 0, 48, 2, "Dot3StatsSingleCollisionFrames"            },
        { 0, 50, 2, "Dot3StatMultipleCollisionFrames"           },
        { 0, 52, 2, "Dot3sDeferredTransmissions"                },
        { 0, 54, 2, "Dot3StatsLateCollisions"                   },
        { 0, 56, 2, "EtherStatsCollisions"                      },
        { 0, 58, 2, "Dot3StatsExcessiveCollisions"              },
        { 0, 60, 2, "Dot3OutPauseFrames"                        },
        { 0, 62, 2, "Dot1dBasePortDelayExceededDiscards"        },
        { 0, 64, 2, "Dot1dTpPortInDiscards"                     },
        { 0, 66, 2, "IfOutUcastPkts"                            },
        { 0, 68, 2, "IfOutMulticastPkts"                        },
        { 0, 70, 2, "IfOutBroadcastPkts"                        },
};

static int rtl8366rb_get_mib_counter(struct realtek_priv *priv,
                                     int port,
                                     struct rtl8366_mib_counter *mib,
                                     u64 *mibvalue)
{
        u32 addr, val;
        int ret;
        int i;

        addr = RTL8366RB_MIB_COUNTER_BASE +
                RTL8366RB_MIB_COUNTER_PORT_OFFSET * (port) +
                mib->offset;

        /* Writing access counter address first
         * then ASIC will prepare 64bits counter wait for being retrived
         */
        ret = regmap_write(priv->map, addr, 0); /* Write whatever */
        if (ret)
                return ret;

        /* Read MIB control register */
        ret = regmap_read(priv->map, RTL8366RB_MIB_CTRL_REG, &val);
        if (ret)
                return -EIO;

        if (val & RTL8366RB_MIB_CTRL_BUSY_MASK)
                return -EBUSY;

        if (val & RTL8366RB_MIB_CTRL_RESET_MASK)
                return -EIO;

        /* Read each individual MIB 16 bits at the time */
        *mibvalue = 0;
        for (i = mib->length; i > 0; i--) {
                ret = regmap_read(priv->map, addr + (i - 1), &val);
                if (ret)
                        return ret;
                *mibvalue = (*mibvalue << 16) | (val & 0xFFFF);
        }
        return 0;
}

static u32 rtl8366rb_get_irqmask(struct irq_data *d)
{
        int line = irqd_to_hwirq(d);
        u32 val;

        /* For line interrupts we combine link down in bits
         * 6..11 with link up in bits 0..5 into one interrupt.
         */
        if (line < 12)
                val = BIT(line) | BIT(line + 6);
        else
                val = BIT(line);
        return val;
}

static void rtl8366rb_mask_irq(struct irq_data *d)
{
        struct realtek_priv *priv = irq_data_get_irq_chip_data(d);
        int ret;

        ret = regmap_update_bits(priv->map, RTL8366RB_INTERRUPT_MASK_REG,
                                 rtl8366rb_get_irqmask(d), 0);
        if (ret)
                dev_err(priv->dev, "could not mask IRQ\n");
}

static void rtl8366rb_unmask_irq(struct irq_data *d)
{
        struct realtek_priv *priv = irq_data_get_irq_chip_data(d);
        int ret;

        ret = regmap_update_bits(priv->map, RTL8366RB_INTERRUPT_MASK_REG,
                                 rtl8366rb_get_irqmask(d),
                                 rtl8366rb_get_irqmask(d));
        if (ret)
                dev_err(priv->dev, "could not unmask IRQ\n");
}

static irqreturn_t rtl8366rb_irq(int irq, void *data)
{
        struct realtek_priv *priv = data;
        u32 stat;
        int ret;

        /* This clears the IRQ status register */
        ret = regmap_read(priv->map, RTL8366RB_INTERRUPT_STATUS_REG,
                          &stat);
        if (ret) {
                dev_err(priv->dev, "can't read interrupt status\n");
                return IRQ_NONE;
        }
        stat &= RTL8366RB_INTERRUPT_VALID;
        if (!stat)
                return IRQ_NONE;
        while (stat) {
                int line = __ffs(stat);
                int child_irq;

                stat &= ~BIT(line);
                /* For line interrupts we combine link down in bits
                 * 6..11 with link up in bits 0..5 into one interrupt.
                 */
                if (line < 12 && line > 5)
                        line -= 5;
                child_irq = irq_find_mapping(priv->irqdomain, line);
                handle_nested_irq(child_irq);
        }
        return IRQ_HANDLED;
}

static struct irq_chip rtl8366rb_irq_chip = {
        .name = "RTL8366RB",
        .irq_mask = rtl8366rb_mask_irq,
        .irq_unmask = rtl8366rb_unmask_irq,
};

static int rtl8366rb_irq_map(struct irq_domain *domain, unsigned int irq,
                             irq_hw_number_t hwirq)
{
        irq_set_chip_data(irq, domain->host_data);
        irq_set_chip_and_handler(irq, &rtl8366rb_irq_chip, handle_simple_irq);
        irq_set_nested_thread(irq, 1);
        irq_set_noprobe(irq);

        return 0;
}

static void rtl8366rb_irq_unmap(struct irq_domain *d, unsigned int irq)
{
        irq_set_nested_thread(irq, 0);
        irq_set_chip_and_handler(irq, NULL, NULL);
        irq_set_chip_data(irq, NULL);
}

static const struct irq_domain_ops rtl8366rb_irqdomain_ops = {
        .map = rtl8366rb_irq_map,
        .unmap = rtl8366rb_irq_unmap,
        .xlate  = irq_domain_xlate_onecell,
};

static int rtl8366rb_setup_cascaded_irq(struct realtek_priv *priv)
{
        struct device_node *intc;
        unsigned long irq_trig;
        int irq;
        int ret;
        u32 val;
        int i;

        intc = of_get_child_by_name(priv->dev->of_node, "interrupt-controller");
        if (!intc) {
                dev_err(priv->dev, "missing child interrupt-controller node\n");
                return -EINVAL;
        }
        /* RB8366RB IRQs cascade off this one */
        irq = of_irq_get(intc, 0);
        if (irq <= 0) {
                dev_err(priv->dev, "failed to get parent IRQ\n");
                ret = irq ? irq : -EINVAL;
                goto out_put_node;
        }

        /* This clears the IRQ status register */
        ret = regmap_read(priv->map, RTL8366RB_INTERRUPT_STATUS_REG,
                          &val);
        if (ret) {
                dev_err(priv->dev, "can't read interrupt status\n");
                goto out_put_node;
        }

        /* Fetch IRQ edge information from the descriptor */
        irq_trig = irq_get_trigger_type(irq);
        switch (irq_trig) {
        case IRQF_TRIGGER_RISING:
        case IRQF_TRIGGER_HIGH:
                dev_info(priv->dev, "active high/rising IRQ\n");
                val = 0;
                break;
        case IRQF_TRIGGER_FALLING:
        case IRQF_TRIGGER_LOW:
                dev_info(priv->dev, "active low/falling IRQ\n");
                val = RTL8366RB_INTERRUPT_POLARITY;
                break;
        }
        ret = regmap_update_bits(priv->map, RTL8366RB_INTERRUPT_CONTROL_REG,
                                 RTL8366RB_INTERRUPT_POLARITY,
                                 val);
        if (ret) {
                dev_err(priv->dev, "could not configure IRQ polarity\n");
                goto out_put_node;
        }

        ret = devm_request_threaded_irq(priv->dev, irq, NULL,
                                        rtl8366rb_irq, IRQF_ONESHOT,
                                        "RTL8366RB", priv);
        if (ret) {
                dev_err(priv->dev, "unable to request irq: %d\n", ret);
                goto out_put_node;
        }
        priv->irqdomain = irq_domain_create_linear(of_fwnode_handle(intc), RTL8366RB_NUM_INTERRUPT,
                                                   &rtl8366rb_irqdomain_ops, priv);
        if (!priv->irqdomain) {
                dev_err(priv->dev, "failed to create IRQ domain\n");
                ret = -EINVAL;
                goto out_put_node;
        }
        for (i = 0; i < priv->num_ports; i++)
                irq_set_parent(irq_create_mapping(priv->irqdomain, i), irq);

out_put_node:
        of_node_put(intc);
        return ret;
}

static int rtl8366rb_set_addr(struct realtek_priv *priv)
{
        u8 addr[ETH_ALEN];
        u16 val;
        int ret;

        eth_random_addr(addr);

        dev_info(priv->dev, "set MAC: %02X:%02X:%02X:%02X:%02X:%02X\n",
                 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
        val = addr[0] << 8 | addr[1];
        ret = regmap_write(priv->map, RTL8366RB_SMAR0, val);
        if (ret)
                return ret;
        val = addr[2] << 8 | addr[3];
        ret = regmap_write(priv->map, RTL8366RB_SMAR1, val);
        if (ret)
                return ret;
        val = addr[4] << 8 | addr[5];
        ret = regmap_write(priv->map, RTL8366RB_SMAR2, val);
        if (ret)
                return ret;

        return 0;
}

/* Found in a vendor driver */

/* Struct for handling the jam tables' entries */
struct rtl8366rb_jam_tbl_entry {
        u16 reg;
        u16 val;
};

/* For the "version 0" early silicon, appear in most source releases */
static const struct rtl8366rb_jam_tbl_entry rtl8366rb_init_jam_ver_0[] = {
        {0x000B, 0x0001}, {0x03A6, 0x0100}, {0x03A7, 0x0001}, {0x02D1, 0x3FFF},
        {0x02D2, 0x3FFF}, {0x02D3, 0x3FFF}, {0x02D4, 0x3FFF}, {0x02D5, 0x3FFF},
        {0x02D6, 0x3FFF}, {0x02D7, 0x3FFF}, {0x02D8, 0x3FFF}, {0x022B, 0x0688},
        {0x022C, 0x0FAC}, {0x03D0, 0x4688}, {0x03D1, 0x01F5}, {0x0000, 0x0830},
        {0x02F9, 0x0200}, {0x02F7, 0x7FFF}, {0x02F8, 0x03FF}, {0x0080, 0x03E8},
        {0x0081, 0x00CE}, {0x0082, 0x00DA}, {0x0083, 0x0230}, {0xBE0F, 0x2000},
        {0x0231, 0x422A}, {0x0232, 0x422A}, {0x0233, 0x422A}, {0x0234, 0x422A},
        {0x0235, 0x422A}, {0x0236, 0x422A}, {0x0237, 0x422A}, {0x0238, 0x422A},
        {0x0239, 0x422A}, {0x023A, 0x422A}, {0x023B, 0x422A}, {0x023C, 0x422A},
        {0x023D, 0x422A}, {0x023E, 0x422A}, {0x023F, 0x422A}, {0x0240, 0x422A},
        {0x0241, 0x422A}, {0x0242, 0x422A}, {0x0243, 0x422A}, {0x0244, 0x422A},
        {0x0245, 0x422A}, {0x0246, 0x422A}, {0x0247, 0x422A}, {0x0248, 0x422A},
        {0x0249, 0x0146}, {0x024A, 0x0146}, {0x024B, 0x0146}, {0xBE03, 0xC961},
        {0x024D, 0x0146}, {0x024E, 0x0146}, {0x024F, 0x0146}, {0x0250, 0x0146},
        {0xBE64, 0x0226}, {0x0252, 0x0146}, {0x0253, 0x0146}, {0x024C, 0x0146},
        {0x0251, 0x0146}, {0x0254, 0x0146}, {0xBE62, 0x3FD0}, {0x0084, 0x0320},
        {0x0255, 0x0146}, {0x0256, 0x0146}, {0x0257, 0x0146}, {0x0258, 0x0146},
        {0x0259, 0x0146}, {0x025A, 0x0146}, {0x025B, 0x0146}, {0x025C, 0x0146},
        {0x025D, 0x0146}, {0x025E, 0x0146}, {0x025F, 0x0146}, {0x0260, 0x0146},
        {0x0261, 0xA23F}, {0x0262, 0x0294}, {0x0263, 0xA23F}, {0x0264, 0x0294},
        {0x0265, 0xA23F}, {0x0266, 0x0294}, {0x0267, 0xA23F}, {0x0268, 0x0294},
        {0x0269, 0xA23F}, {0x026A, 0x0294}, {0x026B, 0xA23F}, {0x026C, 0x0294},
        {0x026D, 0xA23F}, {0x026E, 0x0294}, {0x026F, 0xA23F}, {0x0270, 0x0294},
        {0x02F5, 0x0048}, {0xBE09, 0x0E00}, {0xBE1E, 0x0FA0}, {0xBE14, 0x8448},
        {0xBE15, 0x1007}, {0xBE4A, 0xA284}, {0xC454, 0x3F0B}, {0xC474, 0x3F0B},
        {0xBE48, 0x3672}, {0xBE4B, 0x17A7}, {0xBE4C, 0x0B15}, {0xBE52, 0x0EDD},
        {0xBE49, 0x8C00}, {0xBE5B, 0x785C}, {0xBE5C, 0x785C}, {0xBE5D, 0x785C},
        {0xBE61, 0x368A}, {0xBE63, 0x9B84}, {0xC456, 0xCC13}, {0xC476, 0xCC13},
        {0xBE65, 0x307D}, {0xBE6D, 0x0005}, {0xBE6E, 0xE120}, {0xBE2E, 0x7BAF},
};

/* This v1 init sequence is from Belkin F5D8235 U-Boot release */
static const struct rtl8366rb_jam_tbl_entry rtl8366rb_init_jam_ver_1[] = {
        {0x0000, 0x0830}, {0x0001, 0x8000}, {0x0400, 0x8130}, {0xBE78, 0x3C3C},
        {0x0431, 0x5432}, {0xBE37, 0x0CE4}, {0x02FA, 0xFFDF}, {0x02FB, 0xFFE0},
        {0xC44C, 0x1585}, {0xC44C, 0x1185}, {0xC44C, 0x1585}, {0xC46C, 0x1585},
        {0xC46C, 0x1185}, {0xC46C, 0x1585}, {0xC451, 0x2135}, {0xC471, 0x2135},
        {0xBE10, 0x8140}, {0xBE15, 0x0007}, {0xBE6E, 0xE120}, {0xBE69, 0xD20F},
        {0xBE6B, 0x0320}, {0xBE24, 0xB000}, {0xBE23, 0xFF51}, {0xBE22, 0xDF20},
        {0xBE21, 0x0140}, {0xBE20, 0x00BB}, {0xBE24, 0xB800}, {0xBE24, 0x0000},
        {0xBE24, 0x7000}, {0xBE23, 0xFF51}, {0xBE22, 0xDF60}, {0xBE21, 0x0140},
        {0xBE20, 0x0077}, {0xBE24, 0x7800}, {0xBE24, 0x0000}, {0xBE2E, 0x7B7A},
        {0xBE36, 0x0CE4}, {0x02F5, 0x0048}, {0xBE77, 0x2940}, {0x000A, 0x83E0},
        {0xBE79, 0x3C3C}, {0xBE00, 0x1340},
};

/* This v2 init sequence is from Belkin F5D8235 U-Boot release */
static const struct rtl8366rb_jam_tbl_entry rtl8366rb_init_jam_ver_2[] = {
        {0x0450, 0x0000}, {0x0400, 0x8130}, {0x000A, 0x83ED}, {0x0431, 0x5432},
        {0xC44F, 0x6250}, {0xC46F, 0x6250}, {0xC456, 0x0C14}, {0xC476, 0x0C14},
        {0xC44C, 0x1C85}, {0xC44C, 0x1885}, {0xC44C, 0x1C85}, {0xC46C, 0x1C85},
        {0xC46C, 0x1885}, {0xC46C, 0x1C85}, {0xC44C, 0x0885}, {0xC44C, 0x0881},
        {0xC44C, 0x0885}, {0xC46C, 0x0885}, {0xC46C, 0x0881}, {0xC46C, 0x0885},
        {0xBE2E, 0x7BA7}, {0xBE36, 0x1000}, {0xBE37, 0x1000}, {0x8000, 0x0001},
        {0xBE69, 0xD50F}, {0x8000, 0x0000}, {0xBE69, 0xD50F}, {0xBE6E, 0x0320},
        {0xBE77, 0x2940}, {0xBE78, 0x3C3C}, {0xBE79, 0x3C3C}, {0xBE6E, 0xE120},
        {0x8000, 0x0001}, {0xBE15, 0x1007}, {0x8000, 0x0000}, {0xBE15, 0x1007},
        {0xBE14, 0x0448}, {0xBE1E, 0x00A0}, {0xBE10, 0x8160}, {0xBE10, 0x8140},
        {0xBE00, 0x1340}, {0x0F51, 0x0010},
};

/* Appears in a DDWRT code dump */
static const struct rtl8366rb_jam_tbl_entry rtl8366rb_init_jam_ver_3[] = {
        {0x0000, 0x0830}, {0x0400, 0x8130}, {0x000A, 0x83ED}, {0x0431, 0x5432},
        {0x0F51, 0x0017}, {0x02F5, 0x0048}, {0x02FA, 0xFFDF}, {0x02FB, 0xFFE0},
        {0xC456, 0x0C14}, {0xC476, 0x0C14}, {0xC454, 0x3F8B}, {0xC474, 0x3F8B},
        {0xC450, 0x2071}, {0xC470, 0x2071}, {0xC451, 0x226B}, {0xC471, 0x226B},
        {0xC452, 0xA293}, {0xC472, 0xA293}, {0xC44C, 0x1585}, {0xC44C, 0x1185},
        {0xC44C, 0x1585}, {0xC46C, 0x1585}, {0xC46C, 0x1185}, {0xC46C, 0x1585},
        {0xC44C, 0x0185}, {0xC44C, 0x0181}, {0xC44C, 0x0185}, {0xC46C, 0x0185},
        {0xC46C, 0x0181}, {0xC46C, 0x0185}, {0xBE24, 0xB000}, {0xBE23, 0xFF51},
        {0xBE22, 0xDF20}, {0xBE21, 0x0140}, {0xBE20, 0x00BB}, {0xBE24, 0xB800},
        {0xBE24, 0x0000}, {0xBE24, 0x7000}, {0xBE23, 0xFF51}, {0xBE22, 0xDF60},
        {0xBE21, 0x0140}, {0xBE20, 0x0077}, {0xBE24, 0x7800}, {0xBE24, 0x0000},
        {0xBE2E, 0x7BA7}, {0xBE36, 0x1000}, {0xBE37, 0x1000}, {0x8000, 0x0001},
        {0xBE69, 0xD50F}, {0x8000, 0x0000}, {0xBE69, 0xD50F}, {0xBE6B, 0x0320},
        {0xBE77, 0x2800}, {0xBE78, 0x3C3C}, {0xBE79, 0x3C3C}, {0xBE6E, 0xE120},
        {0x8000, 0x0001}, {0xBE10, 0x8140}, {0x8000, 0x0000}, {0xBE10, 0x8140},
        {0xBE15, 0x1007}, {0xBE14, 0x0448}, {0xBE1E, 0x00A0}, {0xBE10, 0x8160},
        {0xBE10, 0x8140}, {0xBE00, 0x1340}, {0x0450, 0x0000}, {0x0401, 0x0000},
};

/* Belkin F5D8235 v1, "belkin,f5d8235-v1" */
static const struct rtl8366rb_jam_tbl_entry rtl8366rb_init_jam_f5d8235[] = {
        {0x0242, 0x02BF}, {0x0245, 0x02BF}, {0x0248, 0x02BF}, {0x024B, 0x02BF},
        {0x024E, 0x02BF}, {0x0251, 0x02BF}, {0x0254, 0x0A3F}, {0x0256, 0x0A3F},
        {0x0258, 0x0A3F}, {0x025A, 0x0A3F}, {0x025C, 0x0A3F}, {0x025E, 0x0A3F},
        {0x0263, 0x007C}, {0x0100, 0x0004}, {0xBE5B, 0x3500}, {0x800E, 0x200F},
        {0xBE1D, 0x0F00}, {0x8001, 0x5011}, {0x800A, 0xA2F4}, {0x800B, 0x17A3},
        {0xBE4B, 0x17A3}, {0xBE41, 0x5011}, {0xBE17, 0x2100}, {0x8000, 0x8304},
        {0xBE40, 0x8304}, {0xBE4A, 0xA2F4}, {0x800C, 0xA8D5}, {0x8014, 0x5500},
        {0x8015, 0x0004}, {0xBE4C, 0xA8D5}, {0xBE59, 0x0008}, {0xBE09, 0x0E00},
        {0xBE36, 0x1036}, {0xBE37, 0x1036}, {0x800D, 0x00FF}, {0xBE4D, 0x00FF},
};

/* DGN3500, "netgear,dgn3500", "netgear,dgn3500b" */
static const struct rtl8366rb_jam_tbl_entry rtl8366rb_init_jam_dgn3500[] = {
        {0x0000, 0x0830}, {0x0400, 0x8130}, {0x000A, 0x83ED}, {0x0F51, 0x0017},
        {0x02F5, 0x0048}, {0x02FA, 0xFFDF}, {0x02FB, 0xFFE0}, {0x0450, 0x0000},
        {0x0401, 0x0000}, {0x0431, 0x0960},
};

/* This jam table activates "green ethernet", which means low power mode
 * and is claimed to detect the cable length and not use more power than
 * necessary, and the ports should enter power saving mode 10 seconds after
 * a cable is disconnected. Seems to always be the same.
 */
static const struct rtl8366rb_jam_tbl_entry rtl8366rb_green_jam[] = {
        {0xBE78, 0x323C}, {0xBE77, 0x5000}, {0xBE2E, 0x7BA7},
        {0xBE59, 0x3459}, {0xBE5A, 0x745A}, {0xBE5B, 0x785C},
        {0xBE5C, 0x785C}, {0xBE6E, 0xE120}, {0xBE79, 0x323C},
};

/* Function that jams the tables in the proper registers */
static int rtl8366rb_jam_table(const struct rtl8366rb_jam_tbl_entry *jam_table,
                               int jam_size, struct realtek_priv *priv,
                               bool write_dbg)
{
        u32 val;
        int ret;
        int i;

        for (i = 0; i < jam_size; i++) {
                if ((jam_table[i].reg & 0xBE00) == 0xBE00) {
                        ret = regmap_read(priv->map,
                                          RTL8366RB_PHY_ACCESS_BUSY_REG,
                                          &val);
                        if (ret)
                                return ret;
                        if (!(val & RTL8366RB_PHY_INT_BUSY)) {
                                ret = regmap_write(priv->map,
                                                   RTL8366RB_PHY_ACCESS_CTRL_REG,
                                                   RTL8366RB_PHY_CTRL_WRITE);
                                if (ret)
                                        return ret;
                        }
                }
                if (write_dbg)
                        dev_dbg(priv->dev, "jam %04x into register %04x\n",
                                jam_table[i].val,
                                jam_table[i].reg);
                ret = regmap_write(priv->map,
                                   jam_table[i].reg,
                                   jam_table[i].val);
                if (ret)
                        return ret;
        }
        return 0;
}

/* This code is used also with LEDs disabled */
int rb8366rb_set_ledgroup_mode(struct realtek_priv *priv,
                               u8 led_group,
                               enum rtl8366_ledgroup_mode mode)
{
        int ret;
        u32 val;

        val = mode << RTL8366RB_LED_CTRL_OFFSET(led_group);

        ret = regmap_update_bits(priv->map,
                                 RTL8366RB_LED_CTRL_REG,
                                 RTL8366RB_LED_CTRL_MASK(led_group),
                                 val);
        if (ret)
                return ret;

        return 0;
}

/* This code is used also with LEDs disabled */
static int rtl8366rb_setup_all_leds_off(struct realtek_priv *priv)
{
        int ret = 0;
        int i;

        regmap_update_bits(priv->map,
                           RTL8366RB_INTERRUPT_CONTROL_REG,
                           RTL8366RB_P4_RGMII_LED,
                           0);

        for (i = 0; i < RTL8366RB_NUM_LEDGROUPS; i++) {
                ret = rb8366rb_set_ledgroup_mode(priv, i,
                                                 RTL8366RB_LEDGROUP_OFF);
                if (ret)
                        return ret;
        }

        return ret;
}

static int rtl8366rb_setup(struct dsa_switch *ds)
{
        struct realtek_priv *priv = ds->priv;
        const struct rtl8366rb_jam_tbl_entry *jam_table;
        struct rtl8366rb *rb;
        u32 chip_ver = 0;
        u32 chip_id = 0;
        int jam_size;
        int ret;
        int i;

        rb = priv->chip_data;

        ret = regmap_read(priv->map, RTL8366RB_CHIP_ID_REG, &chip_id);
        if (ret) {
                dev_err(priv->dev, "unable to read chip id\n");
                return ret;
        }

        switch (chip_id) {
        case RTL8366RB_CHIP_ID_8366:
                break;
        default:
                dev_err(priv->dev, "unknown chip id (%04x)\n", chip_id);
                return -ENODEV;
        }

        ret = regmap_read(priv->map, RTL8366RB_CHIP_VERSION_CTRL_REG,
                          &chip_ver);
        if (ret) {
                dev_err(priv->dev, "unable to read chip version\n");
                return ret;
        }

        dev_info(priv->dev, "RTL%04x ver %u chip found\n",
                 chip_id, chip_ver & RTL8366RB_CHIP_VERSION_MASK);

        /* Do the init dance using the right jam table */
        switch (chip_ver) {
        case 0:
                jam_table = rtl8366rb_init_jam_ver_0;
                jam_size = ARRAY_SIZE(rtl8366rb_init_jam_ver_0);
                break;
        case 1:
                jam_table = rtl8366rb_init_jam_ver_1;
                jam_size = ARRAY_SIZE(rtl8366rb_init_jam_ver_1);
                break;
        case 2:
                jam_table = rtl8366rb_init_jam_ver_2;
                jam_size = ARRAY_SIZE(rtl8366rb_init_jam_ver_2);
                break;
        default:
                jam_table = rtl8366rb_init_jam_ver_3;
                jam_size = ARRAY_SIZE(rtl8366rb_init_jam_ver_3);
                break;
        }

        /* Special jam tables for special routers
         * TODO: are these necessary? Maintainers, please test
         * without them, using just the off-the-shelf tables.
         */
        if (of_machine_is_compatible("belkin,f5d8235-v1")) {
                jam_table = rtl8366rb_init_jam_f5d8235;
                jam_size = ARRAY_SIZE(rtl8366rb_init_jam_f5d8235);
        }
        if (of_machine_is_compatible("netgear,dgn3500") ||
            of_machine_is_compatible("netgear,dgn3500b")) {
                jam_table = rtl8366rb_init_jam_dgn3500;
                jam_size = ARRAY_SIZE(rtl8366rb_init_jam_dgn3500);
        }

        ret = rtl8366rb_jam_table(jam_table, jam_size, priv, true);
        if (ret)
                return ret;

        /* Isolate all user ports so they can only send packets to itself and the CPU port */
        for (i = 0; i < RTL8366RB_PORT_NUM_CPU; i++) {
                ret = regmap_write(priv->map, RTL8366RB_PORT_ISO(i),
                                   RTL8366RB_PORT_ISO_PORTS(BIT(RTL8366RB_PORT_NUM_CPU)) |
                                   RTL8366RB_PORT_ISO_EN);
                if (ret)
                        return ret;
        }
        /* CPU port can send packets to all ports */
        ret = regmap_write(priv->map, RTL8366RB_PORT_ISO(RTL8366RB_PORT_NUM_CPU),
                           RTL8366RB_PORT_ISO_PORTS(dsa_user_ports(ds)) |
                           RTL8366RB_PORT_ISO_EN);
        if (ret)
                return ret;

        /* Set up the "green ethernet" feature */
        ret = rtl8366rb_jam_table(rtl8366rb_green_jam,
                                  ARRAY_SIZE(rtl8366rb_green_jam), priv, false);
        if (ret)
                return ret;

        ret = regmap_write(priv->map,
                           RTL8366RB_GREEN_FEATURE_REG,
                           (chip_ver == 1) ? 0x0007 : 0x0003);
        if (ret)
                return ret;

        /* Vendor driver sets 0x240 in registers 0xc and 0xd (undocumented) */
        ret = regmap_write(priv->map, 0x0c, 0x240);
        if (ret)
                return ret;
        ret = regmap_write(priv->map, 0x0d, 0x240);
        if (ret)
                return ret;

        /* Set some random MAC address */
        ret = rtl8366rb_set_addr(priv);
        if (ret)
                return ret;

        /* Enable CPU port with custom DSA tag 8899.
         *
         * If you set RTL8366RB_CPU_NO_TAG (bit 15) in this register
         * the custom tag is turned off.
         */
        ret = regmap_update_bits(priv->map, RTL8366RB_CPU_CTRL_REG,
                                 0xFFFF,
                                 BIT(priv->cpu_port));
        if (ret)
                return ret;

        /* Make sure we default-enable the fixed CPU port */
        ret = regmap_update_bits(priv->map, RTL8366RB_PECR,
                                 BIT(priv->cpu_port),
                                 0);
        if (ret)
                return ret;

        /* Set default maximum packet length to 1536 bytes */
        ret = regmap_update_bits(priv->map, RTL8366RB_SGCR,
                                 RTL8366RB_SGCR_MAX_LENGTH_MASK,
                                 RTL8366RB_SGCR_MAX_LENGTH_1536);
        if (ret)
                return ret;
        for (i = 0; i < RTL8366RB_NUM_PORTS; i++) {
                if (i == priv->cpu_port)
                        /* CPU port need to also accept the tag */
                        rb->max_mtu[i] = ETH_DATA_LEN + RTL8366RB_CPU_TAG_SIZE;
                else
                        rb->max_mtu[i] = ETH_DATA_LEN;
        }

        /* Disable learning for all ports */
        ret = regmap_write(priv->map, RTL8366RB_PORT_LEARNDIS_CTRL,
                           RTL8366RB_PORT_ALL);
        if (ret)
                return ret;

        /* Enable auto ageing for all ports */
        ret = regmap_write(priv->map, RTL8366RB_SECURITY_CTRL, 0);
        if (ret)
                return ret;

        /* Port 4 setup: this enables Port 4, usually the WAN port,
         * common PHY IO mode is apparently mode 0, and this is not what
         * the port is initialized to. There is no explanation of the
         * IO modes in the Realtek source code, if your WAN port is
         * connected to something exotic such as fiber, then this might
         * be worth experimenting with.
         */
        ret = regmap_update_bits(priv->map, RTL8366RB_PMC0,
                                 RTL8366RB_PMC0_P4_IOMODE_MASK,
                                 0 << RTL8366RB_PMC0_P4_IOMODE_SHIFT);
        if (ret)
                return ret;

        /* Accept all packets by default, we enable filtering on-demand */
        ret = regmap_write(priv->map, RTL8366RB_VLAN_INGRESS_CTRL1_REG,
                           0);
        if (ret)
                return ret;
        ret = regmap_write(priv->map, RTL8366RB_VLAN_INGRESS_CTRL2_REG,
                           0);
        if (ret)
                return ret;

        /* Don't drop packets whose DA has not been learned */
        ret = regmap_update_bits(priv->map, RTL8366RB_SSCR2,
                                 RTL8366RB_SSCR2_DROP_UNKNOWN_DA, 0);
        if (ret)
                return ret;

        /* Set blinking, used by all LED groups using HW triggers.
         * TODO: make this configurable
         */
        ret = regmap_update_bits(priv->map, RTL8366RB_LED_BLINKRATE_REG,
                                 RTL8366RB_LED_BLINKRATE_MASK,
                                 RTL8366RB_LED_BLINKRATE_56MS);
        if (ret)
                return ret;

        /* Set up LED activity:
         * Each port has 4 LEDs on fixed groups. Each group shares the same
         * hardware trigger across all ports. LEDs can only be indiviually
         * controlled setting the LED group to fixed mode and using the driver
         * to toggle them LEDs on/off.
         */
        if (priv->leds_disabled) {
                ret = rtl8366rb_setup_all_leds_off(priv);
                if (ret)
                        return ret;
        } else {
                ret = rtl8366rb_setup_leds(priv);
                if (ret)
                        return ret;
        }

        ret = rtl8366_reset_vlan(priv);
        if (ret)
                return ret;

        ret = rtl8366rb_setup_cascaded_irq(priv);
        if (ret)
                dev_info(priv->dev, "no interrupt support\n");

        ret = rtl83xx_setup_user_mdio(ds);
        if (ret) {
                dev_err(priv->dev, "could not set up MDIO bus\n");
                return -ENODEV;
        }

        return 0;
}

static enum dsa_tag_protocol rtl8366_get_tag_protocol(struct dsa_switch *ds,
                                                      int port,
                                                      enum dsa_tag_protocol mp)
{
        /* This switch uses the 4 byte protocol A Realtek DSA tag */
        return DSA_TAG_PROTO_RTL4_A;
}

static void rtl8366rb_phylink_get_caps(struct dsa_switch *ds, int port,
                                       struct phylink_config *config)
{
        unsigned long *interfaces = config->supported_interfaces;
        struct realtek_priv *priv = ds->priv;

        if (port == priv->cpu_port) {
                __set_bit(PHY_INTERFACE_MODE_MII, interfaces);
                __set_bit(PHY_INTERFACE_MODE_GMII, interfaces);
                /* REVMII only supports 100M FD */
                __set_bit(PHY_INTERFACE_MODE_REVMII, interfaces);
                /* RGMII only supports 1G FD */
                phy_interface_set_rgmii(interfaces);

                config->mac_capabilities = MAC_1000 | MAC_100 |
                                           MAC_SYM_PAUSE;
        } else {
                /* RSGMII port, but we don't have that, and we don't
                 * specify in DT, so phylib uses the default of GMII
                 */
                __set_bit(PHY_INTERFACE_MODE_GMII, interfaces);
                config->mac_capabilities = MAC_1000 | MAC_100 | MAC_10 |
                                           MAC_SYM_PAUSE | MAC_ASYM_PAUSE;
        }
}

static void
rtl8366rb_mac_config(struct phylink_config *config, unsigned int mode,
                     const struct phylink_link_state *state)
{
}

static void
rtl8366rb_mac_link_up(struct phylink_config *config, struct phy_device *phydev,
                      unsigned int mode, phy_interface_t interface,
                      int speed, int duplex, bool tx_pause, bool rx_pause)
{
        struct dsa_port *dp = dsa_phylink_to_port(config);
        struct realtek_priv *priv = dp->ds->priv;
        int port = dp->index;
        unsigned int val;
        int ret;

        /* Allow forcing the mode on the fixed CPU port, no autonegotiation.
         * We assume autonegotiation works on the PHY-facing ports.
         */
        if (port != priv->cpu_port)
                return;

        dev_dbg(priv->dev, "MAC link up on CPU port (%d)\n", port);

        ret = regmap_update_bits(priv->map, RTL8366RB_MAC_FORCE_CTRL_REG,
                                 BIT(port), BIT(port));
        if (ret) {
                dev_err(priv->dev, "failed to force CPU port\n");
                return;
        }

        /* Conjure port config */
        switch (speed) {
        case SPEED_10:
                val = RTL8366RB_PAACR_SPEED_10M;
                break;
        case SPEED_100:
                val = RTL8366RB_PAACR_SPEED_100M;
                break;
        case SPEED_1000:
                val = RTL8366RB_PAACR_SPEED_1000M;
                break;
        default:
                val = RTL8366RB_PAACR_SPEED_1000M;
                break;
        }

        if (duplex == DUPLEX_FULL)
                val |= RTL8366RB_PAACR_FULL_DUPLEX;

        if (tx_pause)
                val |=  RTL8366RB_PAACR_TX_PAUSE;

        if (rx_pause)
                val |= RTL8366RB_PAACR_RX_PAUSE;

        val |= RTL8366RB_PAACR_LINK_UP;

        ret = regmap_update_bits(priv->map, RTL8366RB_PAACR2,
                                 0xFF00U,
                                 val << 8);
        if (ret) {
                dev_err(priv->dev, "failed to set PAACR on CPU port\n");
                return;
        }

        dev_dbg(priv->dev, "set PAACR to %04x\n", val);

        /* Enable the CPU port */
        ret = regmap_update_bits(priv->map, RTL8366RB_PECR, BIT(port),
                                 0);
        if (ret) {
                dev_err(priv->dev, "failed to enable the CPU port\n");
                return;
        }
}

static void
rtl8366rb_mac_link_down(struct phylink_config *config, unsigned int mode,
                        phy_interface_t interface)
{
        struct dsa_port *dp = dsa_phylink_to_port(config);
        struct realtek_priv *priv = dp->ds->priv;
        int port = dp->index;
        int ret;

        if (port != priv->cpu_port)
                return;

        dev_dbg(priv->dev, "MAC link down on CPU port (%d)\n", port);

        /* Disable the CPU port */
        ret = regmap_update_bits(priv->map, RTL8366RB_PECR, BIT(port),
                                 BIT(port));
        if (ret) {
                dev_err(priv->dev, "failed to disable the CPU port\n");
                return;
        }
}

static int
rtl8366rb_port_enable(struct dsa_switch *ds, int port,
                      struct phy_device *phy)
{
        struct realtek_priv *priv = ds->priv;
        int ret;

        dev_dbg(priv->dev, "enable port %d\n", port);
        ret = regmap_update_bits(priv->map, RTL8366RB_PECR, BIT(port),
                                 0);
        if (ret)
                return ret;

        return 0;
}

static void
rtl8366rb_port_disable(struct dsa_switch *ds, int port)
{
        struct realtek_priv *priv = ds->priv;
        int ret;

        dev_dbg(priv->dev, "disable port %d\n", port);
        ret = regmap_update_bits(priv->map, RTL8366RB_PECR, BIT(port),
                                 BIT(port));
        if (ret)
                return;
}

static int
rtl8366rb_port_bridge_join(struct dsa_switch *ds, int port,
                           struct dsa_bridge bridge,
                           bool *tx_fwd_offload,
                           struct netlink_ext_ack *extack)
{
        struct realtek_priv *priv = ds->priv;
        unsigned int port_bitmap = 0;
        int ret, i;

        /* Loop over all other ports than the current one */
        for (i = 0; i < RTL8366RB_PORT_NUM_CPU; i++) {
                /* Current port handled last */
                if (i == port)
                        continue;
                /* Not on this bridge */
                if (!dsa_port_offloads_bridge(dsa_to_port(ds, i), &bridge))
                        continue;
                /* Join this port to each other port on the bridge */
                ret = regmap_update_bits(priv->map, RTL8366RB_PORT_ISO(i),
                                         RTL8366RB_PORT_ISO_PORTS(BIT(port)),
                                         RTL8366RB_PORT_ISO_PORTS(BIT(port)));
                if (ret)
                        dev_err(priv->dev, "failed to join port %d\n", port);

                port_bitmap |= BIT(i);
        }

        /* Set the bits for the ports we can access */
        return regmap_update_bits(priv->map, RTL8366RB_PORT_ISO(port),
                                  RTL8366RB_PORT_ISO_PORTS(port_bitmap),
                                  RTL8366RB_PORT_ISO_PORTS(port_bitmap));
}

static void
rtl8366rb_port_bridge_leave(struct dsa_switch *ds, int port,
                            struct dsa_bridge bridge)
{
        struct realtek_priv *priv = ds->priv;
        unsigned int port_bitmap = 0;
        int ret, i;

        /* Loop over all other ports than this one */
        for (i = 0; i < RTL8366RB_PORT_NUM_CPU; i++) {
                /* Current port handled last */
                if (i == port)
                        continue;
                /* Not on this bridge */
                if (!dsa_port_offloads_bridge(dsa_to_port(ds, i), &bridge))
                        continue;
                /* Remove this port from any other port on the bridge */
                ret = regmap_update_bits(priv->map, RTL8366RB_PORT_ISO(i),
                                         RTL8366RB_PORT_ISO_PORTS(BIT(port)), 0);
                if (ret)
                        dev_err(priv->dev, "failed to leave port %d\n", port);

                port_bitmap |= BIT(i);
        }

        /* Clear the bits for the ports we can not access, leave ourselves */
        regmap_update_bits(priv->map, RTL8366RB_PORT_ISO(port),
                           RTL8366RB_PORT_ISO_PORTS(port_bitmap), 0);
}

/**
 * rtl8366rb_drop_untagged() - make the switch drop untagged and C-tagged frames
 * @priv: SMI state container
 * @port: the port to drop untagged and C-tagged frames on
 * @drop: whether to drop or pass untagged and C-tagged frames
 *
 * Return: zero for success, a negative number on error.
 */
static int rtl8366rb_drop_untagged(struct realtek_priv *priv, int port, bool drop)
{
        return regmap_update_bits(priv->map, RTL8366RB_VLAN_INGRESS_CTRL1_REG,
                                  RTL8366RB_VLAN_INGRESS_CTRL1_DROP(port),
                                  drop ? RTL8366RB_VLAN_INGRESS_CTRL1_DROP(port) : 0);
}

static int rtl8366rb_vlan_filtering(struct dsa_switch *ds, int port,
                                    bool vlan_filtering,
                                    struct netlink_ext_ack *extack)
{
        struct realtek_priv *priv = ds->priv;
        struct rtl8366rb *rb;
        int ret;

        rb = priv->chip_data;

        dev_dbg(priv->dev, "port %d: %s VLAN filtering\n", port,
                str_enable_disable(vlan_filtering));

        /* If the port is not in the member set, the frame will be dropped */
        ret = regmap_update_bits(priv->map, RTL8366RB_VLAN_INGRESS_CTRL2_REG,
                                 BIT(port), vlan_filtering ? BIT(port) : 0);
        if (ret)
                return ret;

        /* If VLAN filtering is enabled and PVID is also enabled, we must
         * not drop any untagged or C-tagged frames. If we turn off VLAN
         * filtering on a port, we need to accept any frames.
         */
        if (vlan_filtering)
                ret = rtl8366rb_drop_untagged(priv, port, !rb->pvid_enabled[port]);
        else
                ret = rtl8366rb_drop_untagged(priv, port, false);

        return ret;
}

static int
rtl8366rb_port_pre_bridge_flags(struct dsa_switch *ds, int port,
                                struct switchdev_brport_flags flags,
                                struct netlink_ext_ack *extack)
{
        /* We support enabling/disabling learning */
        if (flags.mask & ~(BR_LEARNING))
                return -EINVAL;

        return 0;
}

static int
rtl8366rb_port_bridge_flags(struct dsa_switch *ds, int port,
                            struct switchdev_brport_flags flags,
                            struct netlink_ext_ack *extack)
{
        struct realtek_priv *priv = ds->priv;
        int ret;

        if (flags.mask & BR_LEARNING) {
                ret = regmap_update_bits(priv->map, RTL8366RB_PORT_LEARNDIS_CTRL,
                                         BIT(port),
                                         (flags.val & BR_LEARNING) ? 0 : BIT(port));
                if (ret)
                        return ret;
        }

        return 0;
}

static void
rtl8366rb_port_stp_state_set(struct dsa_switch *ds, int port, u8 state)
{
        struct realtek_priv *priv = ds->priv;
        u32 val;
        int i;

        switch (state) {
        case BR_STATE_DISABLED:
                val = RTL8366RB_STP_STATE_DISABLED;
                break;
        case BR_STATE_BLOCKING:
        case BR_STATE_LISTENING:
                val = RTL8366RB_STP_STATE_BLOCKING;
                break;
        case BR_STATE_LEARNING:
                val = RTL8366RB_STP_STATE_LEARNING;
                break;
        case BR_STATE_FORWARDING:
                val = RTL8366RB_STP_STATE_FORWARDING;
                break;
        default:
                dev_err(priv->dev, "unknown bridge state requested\n");
                return;
        }

        /* Set the same status for the port on all the FIDs */
        for (i = 0; i < RTL8366RB_NUM_FIDS; i++) {
                regmap_update_bits(priv->map, RTL8366RB_STP_STATE_BASE + i,
                                   RTL8366RB_STP_STATE_MASK(port),
                                   RTL8366RB_STP_STATE(port, val));
        }
}

static void
rtl8366rb_port_fast_age(struct dsa_switch *ds, int port)
{
        struct realtek_priv *priv = ds->priv;

        /* This will age out any learned L2 entries */
        regmap_update_bits(priv->map, RTL8366RB_SECURITY_CTRL,
                           BIT(port), BIT(port));
        /* Restore the normal state of things */
        regmap_update_bits(priv->map, RTL8366RB_SECURITY_CTRL,
                           BIT(port), 0);
}

static int rtl8366rb_change_mtu(struct dsa_switch *ds, int port, int new_mtu)
{
        struct realtek_priv *priv = ds->priv;
        struct rtl8366rb *rb;
        unsigned int max_mtu;
        u32 len;
        int i;

        /* Cache the per-port MTU setting */
        rb = priv->chip_data;
        rb->max_mtu[port] = new_mtu;

        /* Roof out the MTU for the entire switch to the greatest
         * common denominator: the biggest set for any one port will
         * be the biggest MTU for the switch.
         */
        max_mtu = ETH_DATA_LEN;
        for (i = 0; i < RTL8366RB_NUM_PORTS; i++) {
                if (rb->max_mtu[i] > max_mtu)
                        max_mtu = rb->max_mtu[i];
        }

        /* Translate to layer 2 size.
         * Add ethernet and (possible) VLAN headers, and checksum to the size.
         * For ETH_DATA_LEN (1500 bytes) this will add up to 1522 bytes.
         */
        max_mtu += VLAN_ETH_HLEN;
        max_mtu += ETH_FCS_LEN;

        if (max_mtu <= 1522)
                len = RTL8366RB_SGCR_MAX_LENGTH_1522;
        else if (max_mtu > 1522 && max_mtu <= 1536)
                /* This will be the most common default if using VLAN and
                 * CPU tagging on a port as both VLAN and CPU tag will
                 * result in 1518 + 4 + 4 = 1526 bytes.
                 */
                len = RTL8366RB_SGCR_MAX_LENGTH_1536;
        else if (max_mtu > 1536 && max_mtu <= 1552)
                len = RTL8366RB_SGCR_MAX_LENGTH_1552;
        else
                len = RTL8366RB_SGCR_MAX_LENGTH_16000;

        return regmap_update_bits(priv->map, RTL8366RB_SGCR,
                                  RTL8366RB_SGCR_MAX_LENGTH_MASK,
                                  len);
}

static int rtl8366rb_max_mtu(struct dsa_switch *ds, int port)
{
        /* The max MTU is 16000 bytes, so we subtract the ethernet
         * headers with VLAN and checksum and arrive at
         * 16000 - 18 - 4 = 15978. This does not include the CPU tag
         * since that is added to the requested MTU by the DSA framework.
         */
        return 16000 - VLAN_ETH_HLEN - ETH_FCS_LEN;
}

static int rtl8366rb_get_vlan_4k(struct realtek_priv *priv, u32 vid,
                                 struct rtl8366_vlan_4k *vlan4k)
{
        u32 data[3];
        int ret;
        int i;

        memset(vlan4k, '\0', sizeof(struct rtl8366_vlan_4k));

        if (vid >= RTL8366RB_NUM_VIDS)
                return -EINVAL;

        /* write VID */
        ret = regmap_write(priv->map, RTL8366RB_VLAN_TABLE_WRITE_BASE,
                           vid & RTL8366RB_VLAN_VID_MASK);
        if (ret)
                return ret;

        /* write table access control word */
        ret = regmap_write(priv->map, RTL8366RB_TABLE_ACCESS_CTRL_REG,
                           RTL8366RB_TABLE_VLAN_READ_CTRL);
        if (ret)
                return ret;

        for (i = 0; i < 3; i++) {
                ret = regmap_read(priv->map,
                                  RTL8366RB_VLAN_TABLE_READ_BASE + i,
                                  &data[i]);
                if (ret)
                        return ret;
        }

        vlan4k->vid = vid;
        vlan4k->untag = (data[1] >> RTL8366RB_VLAN_UNTAG_SHIFT) &
                        RTL8366RB_VLAN_UNTAG_MASK;
        vlan4k->member = data[1] & RTL8366RB_VLAN_MEMBER_MASK;
        vlan4k->fid = data[2] & RTL8366RB_VLAN_FID_MASK;

        return 0;
}

static int rtl8366rb_set_vlan_4k(struct realtek_priv *priv,
                                 const struct rtl8366_vlan_4k *vlan4k)
{
        u32 data[3];
        int ret;
        int i;

        if (vlan4k->vid >= RTL8366RB_NUM_VIDS ||
            vlan4k->member > RTL8366RB_VLAN_MEMBER_MASK ||
            vlan4k->untag > RTL8366RB_VLAN_UNTAG_MASK ||
            vlan4k->fid > RTL8366RB_FIDMAX)
                return -EINVAL;

        data[0] = vlan4k->vid & RTL8366RB_VLAN_VID_MASK;
        data[1] = (vlan4k->member & RTL8366RB_VLAN_MEMBER_MASK) |
                  ((vlan4k->untag & RTL8366RB_VLAN_UNTAG_MASK) <<
                        RTL8366RB_VLAN_UNTAG_SHIFT);
        data[2] = vlan4k->fid & RTL8366RB_VLAN_FID_MASK;

        for (i = 0; i < 3; i++) {
                ret = regmap_write(priv->map,
                                   RTL8366RB_VLAN_TABLE_WRITE_BASE + i,
                                   data[i]);
                if (ret)
                        return ret;
        }

        /* write table access control word */
        ret = regmap_write(priv->map, RTL8366RB_TABLE_ACCESS_CTRL_REG,
                           RTL8366RB_TABLE_VLAN_WRITE_CTRL);

        return ret;
}

static int rtl8366rb_get_vlan_mc(struct realtek_priv *priv, u32 index,
                                 struct rtl8366_vlan_mc *vlanmc)
{
        u32 data[3];
        int ret;
        int i;

        memset(vlanmc, '\0', sizeof(struct rtl8366_vlan_mc));

        if (index >= RTL8366RB_NUM_VLANS)
                return -EINVAL;

        for (i = 0; i < 3; i++) {
                ret = regmap_read(priv->map,
                                  RTL8366RB_VLAN_MC_BASE(index) + i,
                                  &data[i]);
                if (ret)
                        return ret;
        }

        vlanmc->vid = data[0] & RTL8366RB_VLAN_VID_MASK;
        vlanmc->priority = (data[0] >> RTL8366RB_VLAN_PRIORITY_SHIFT) &
                RTL8366RB_VLAN_PRIORITY_MASK;
        vlanmc->untag = (data[1] >> RTL8366RB_VLAN_UNTAG_SHIFT) &
                RTL8366RB_VLAN_UNTAG_MASK;
        vlanmc->member = data[1] & RTL8366RB_VLAN_MEMBER_MASK;
        vlanmc->fid = data[2] & RTL8366RB_VLAN_FID_MASK;

        return 0;
}

static int rtl8366rb_set_vlan_mc(struct realtek_priv *priv, u32 index,
                                 const struct rtl8366_vlan_mc *vlanmc)
{
        u32 data[3];
        int ret;
        int i;

        if (index >= RTL8366RB_NUM_VLANS ||
            vlanmc->vid >= RTL8366RB_NUM_VIDS ||
            vlanmc->priority > RTL8366RB_PRIORITYMAX ||
            vlanmc->member > RTL8366RB_VLAN_MEMBER_MASK ||
            vlanmc->untag > RTL8366RB_VLAN_UNTAG_MASK ||
            vlanmc->fid > RTL8366RB_FIDMAX)
                return -EINVAL;

        data[0] = (vlanmc->vid & RTL8366RB_VLAN_VID_MASK) |
                  ((vlanmc->priority & RTL8366RB_VLAN_PRIORITY_MASK) <<
                        RTL8366RB_VLAN_PRIORITY_SHIFT);
        data[1] = (vlanmc->member & RTL8366RB_VLAN_MEMBER_MASK) |
                  ((vlanmc->untag & RTL8366RB_VLAN_UNTAG_MASK) <<
                        RTL8366RB_VLAN_UNTAG_SHIFT);
        data[2] = vlanmc->fid & RTL8366RB_VLAN_FID_MASK;

        for (i = 0; i < 3; i++) {
                ret = regmap_write(priv->map,
                                   RTL8366RB_VLAN_MC_BASE(index) + i,
                                   data[i]);
                if (ret)
                        return ret;
        }

        return 0;
}

static int rtl8366rb_get_mc_index(struct realtek_priv *priv, int port, int *val)
{
        u32 data;
        int ret;

        if (port >= priv->num_ports)
                return -EINVAL;

        ret = regmap_read(priv->map, RTL8366RB_PORT_VLAN_CTRL_REG(port),
                          &data);
        if (ret)
                return ret;

        *val = (data >> RTL8366RB_PORT_VLAN_CTRL_SHIFT(port)) &
                RTL8366RB_PORT_VLAN_CTRL_MASK;

        return 0;
}

static int rtl8366rb_set_mc_index(struct realtek_priv *priv, int port, int index)
{
        struct dsa_switch *ds = &priv->ds;
        struct rtl8366rb *rb;
        bool pvid_enabled;
        int ret;

        rb = priv->chip_data;
        pvid_enabled = !!index;

        if (port >= priv->num_ports || index >= RTL8366RB_NUM_VLANS)
                return -EINVAL;

        ret = regmap_update_bits(priv->map, RTL8366RB_PORT_VLAN_CTRL_REG(port),
                                 RTL8366RB_PORT_VLAN_CTRL_MASK <<
                                        RTL8366RB_PORT_VLAN_CTRL_SHIFT(port),
                                 (index & RTL8366RB_PORT_VLAN_CTRL_MASK) <<
                                        RTL8366RB_PORT_VLAN_CTRL_SHIFT(port));
        if (ret)
                return ret;

        rb->pvid_enabled[port] = pvid_enabled;

        /* If VLAN filtering is enabled and PVID is also enabled, we must
         * not drop any untagged or C-tagged frames. Make sure to update the
         * filtering setting.
         */
        if (dsa_port_is_vlan_filtering(dsa_to_port(ds, port)))
                ret = rtl8366rb_drop_untagged(priv, port, !pvid_enabled);

        return ret;
}

static bool rtl8366rb_is_vlan_valid(struct realtek_priv *priv, unsigned int vlan)
{
        unsigned int max = RTL8366RB_NUM_VLANS - 1;

        if (priv->vlan4k_enabled)
                max = RTL8366RB_NUM_VIDS - 1;

        if (vlan > max)
                return false;

        return true;
}

static int rtl8366rb_enable_vlan(struct realtek_priv *priv, bool enable)
{
        dev_dbg(priv->dev, "%s VLAN\n", str_enable_disable(enable));
        return regmap_update_bits(priv->map,
                                  RTL8366RB_SGCR, RTL8366RB_SGCR_EN_VLAN,
                                  enable ? RTL8366RB_SGCR_EN_VLAN : 0);
}

static int rtl8366rb_enable_vlan4k(struct realtek_priv *priv, bool enable)
{
        dev_dbg(priv->dev, "%s VLAN 4k\n", str_enable_disable(enable));
        return regmap_update_bits(priv->map, RTL8366RB_SGCR,
                                  RTL8366RB_SGCR_EN_VLAN_4KTB,
                                  enable ? RTL8366RB_SGCR_EN_VLAN_4KTB : 0);
}

static int rtl8366rb_phy_read(struct realtek_priv *priv, int phy, int regnum)
{
        u32 val;
        u32 reg;
        int ret;

        if (phy > RTL8366RB_PHY_NO_MAX)
                return -EINVAL;

        rtl83xx_lock(priv);

        ret = regmap_write(priv->map_nolock, RTL8366RB_PHY_ACCESS_CTRL_REG,
                           RTL8366RB_PHY_CTRL_READ);
        if (ret)
                goto out;

        reg = 0x8000 | (1 << (phy + RTL8366RB_PHY_NO_OFFSET)) | regnum;

        ret = regmap_write(priv->map_nolock, reg, 0);
        if (ret) {
                dev_err(priv->dev,
                        "failed to write PHY%d reg %04x @ %04x, ret %d\n",
                        phy, regnum, reg, ret);
                goto out;
        }

        ret = regmap_read(priv->map_nolock, RTL8366RB_PHY_ACCESS_DATA_REG,
                          &val);
        if (ret)
                goto out;

        ret = val;

        dev_dbg(priv->dev, "read PHY%d register 0x%04x @ %08x, val <- %04x\n",
                phy, regnum, reg, val);

out:
        rtl83xx_unlock(priv);

        return ret;
}

static int rtl8366rb_phy_write(struct realtek_priv *priv, int phy, int regnum,
                               u16 val)
{
        u32 reg;
        int ret;

        if (phy > RTL8366RB_PHY_NO_MAX)
                return -EINVAL;

        rtl83xx_lock(priv);

        ret = regmap_write(priv->map_nolock, RTL8366RB_PHY_ACCESS_CTRL_REG,
                           RTL8366RB_PHY_CTRL_WRITE);
        if (ret)
                goto out;

        reg = 0x8000 | (1 << (phy + RTL8366RB_PHY_NO_OFFSET)) | regnum;

        dev_dbg(priv->dev, "write PHY%d register 0x%04x @ %04x, val -> %04x\n",
                phy, regnum, reg, val);

        ret = regmap_write(priv->map_nolock, reg, val);
        if (ret)
                goto out;

out:
        rtl83xx_unlock(priv);

        return ret;
}

static int rtl8366rb_reset_chip(struct realtek_priv *priv)
{
        int timeout = 10;
        u32 val;
        int ret;

        priv->write_reg_noack(priv, RTL8366RB_RESET_CTRL_REG,
                              RTL8366RB_CHIP_CTRL_RESET_HW);
        do {
                usleep_range(20000, 25000);
                ret = regmap_read(priv->map, RTL8366RB_RESET_CTRL_REG, &val);
                if (ret)
                        return ret;

                if (!(val & RTL8366RB_CHIP_CTRL_RESET_HW))
                        break;
        } while (--timeout);

        if (!timeout) {
                dev_err(priv->dev, "timeout waiting for the switch to reset\n");
                return -EIO;
        }

        return 0;
}

static int rtl8366rb_detect(struct realtek_priv *priv)
{
        struct device *dev = priv->dev;
        int ret;
        u32 val;

        /* Detect device */
        ret = regmap_read(priv->map, 0x5c, &val);
        if (ret) {
                dev_err(dev, "can't get chip ID (%d)\n", ret);
                return ret;
        }

        switch (val) {
        case 0x6027:
                dev_info(dev, "found an RTL8366S switch\n");
                dev_err(dev, "this switch is not yet supported, submit patches!\n");
                return -ENODEV;
        case 0x5937:
                dev_info(dev, "found an RTL8366RB switch\n");
                priv->cpu_port = RTL8366RB_PORT_NUM_CPU;
                priv->num_ports = RTL8366RB_NUM_PORTS;
                priv->num_vlan_mc = RTL8366RB_NUM_VLANS;
                priv->mib_counters = rtl8366rb_mib_counters;
                priv->num_mib_counters = ARRAY_SIZE(rtl8366rb_mib_counters);
                break;
        default:
                dev_info(dev, "found an Unknown Realtek switch (id=0x%04x)\n",
                         val);
                break;
        }

        ret = rtl8366rb_reset_chip(priv);
        if (ret)
                return ret;

        return 0;
}

static const struct phylink_mac_ops rtl8366rb_phylink_mac_ops = {
        .mac_config = rtl8366rb_mac_config,
        .mac_link_down = rtl8366rb_mac_link_down,
        .mac_link_up = rtl8366rb_mac_link_up,
};

static const struct dsa_switch_ops rtl8366rb_switch_ops = {
        .get_tag_protocol = rtl8366_get_tag_protocol,
        .setup = rtl8366rb_setup,
        .phylink_get_caps = rtl8366rb_phylink_get_caps,
        .get_strings = rtl8366_get_strings,
        .get_ethtool_stats = rtl8366_get_ethtool_stats,
        .get_sset_count = rtl8366_get_sset_count,
        .port_bridge_join = rtl8366rb_port_bridge_join,
        .port_bridge_leave = rtl8366rb_port_bridge_leave,
        .port_vlan_filtering = rtl8366rb_vlan_filtering,
        .port_vlan_add = rtl8366_vlan_add,
        .port_vlan_del = rtl8366_vlan_del,
        .port_enable = rtl8366rb_port_enable,
        .port_disable = rtl8366rb_port_disable,
        .port_pre_bridge_flags = rtl8366rb_port_pre_bridge_flags,
        .port_bridge_flags = rtl8366rb_port_bridge_flags,
        .port_stp_state_set = rtl8366rb_port_stp_state_set,
        .port_fast_age = rtl8366rb_port_fast_age,
        .port_change_mtu = rtl8366rb_change_mtu,
        .port_max_mtu = rtl8366rb_max_mtu,
        .port_hsr_join = dsa_port_simple_hsr_join,
        .port_hsr_leave = dsa_port_simple_hsr_leave,
};

static const struct realtek_ops rtl8366rb_ops = {
        .detect         = rtl8366rb_detect,
        .get_vlan_mc    = rtl8366rb_get_vlan_mc,
        .set_vlan_mc    = rtl8366rb_set_vlan_mc,
        .get_vlan_4k    = rtl8366rb_get_vlan_4k,
        .set_vlan_4k    = rtl8366rb_set_vlan_4k,
        .get_mc_index   = rtl8366rb_get_mc_index,
        .set_mc_index   = rtl8366rb_set_mc_index,
        .get_mib_counter = rtl8366rb_get_mib_counter,
        .is_vlan_valid  = rtl8366rb_is_vlan_valid,
        .enable_vlan    = rtl8366rb_enable_vlan,
        .enable_vlan4k  = rtl8366rb_enable_vlan4k,
        .phy_read       = rtl8366rb_phy_read,
        .phy_write      = rtl8366rb_phy_write,
};

const struct realtek_variant rtl8366rb_variant = {
        .ds_ops = &rtl8366rb_switch_ops,
        .ops = &rtl8366rb_ops,
        .phylink_mac_ops = &rtl8366rb_phylink_mac_ops,
        .clk_delay = 10,
        .cmd_read = 0xa9,
        .cmd_write = 0xa8,
        .chip_data_sz = sizeof(struct rtl8366rb),
};

static const struct of_device_id rtl8366rb_of_match[] = {
        { .compatible = "realtek,rtl8366rb", .data = &rtl8366rb_variant, },
        { /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, rtl8366rb_of_match);

static struct platform_driver rtl8366rb_smi_driver = {
        .driver = {
                .name = "rtl8366rb-smi",
                .of_match_table = rtl8366rb_of_match,
        },
        .probe  = realtek_smi_probe,
        .remove = realtek_smi_remove,
        .shutdown = realtek_smi_shutdown,
};

static struct mdio_driver rtl8366rb_mdio_driver = {
        .mdiodrv.driver = {
                .name = "rtl8366rb-mdio",
                .of_match_table = rtl8366rb_of_match,
        },
        .probe  = realtek_mdio_probe,
        .remove = realtek_mdio_remove,
        .shutdown = realtek_mdio_shutdown,
};

static int rtl8366rb_init(void)
{
        int ret;

        ret = realtek_mdio_driver_register(&rtl8366rb_mdio_driver);
        if (ret)
                return ret;

        ret = realtek_smi_driver_register(&rtl8366rb_smi_driver);
        if (ret) {
                realtek_mdio_driver_unregister(&rtl8366rb_mdio_driver);
                return ret;
        }

        return 0;
}
module_init(rtl8366rb_init);

static void __exit rtl8366rb_exit(void)
{
        realtek_smi_driver_unregister(&rtl8366rb_smi_driver);
        realtek_mdio_driver_unregister(&rtl8366rb_mdio_driver);
}
module_exit(rtl8366rb_exit);

MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
MODULE_DESCRIPTION("Driver for RTL8366RB ethernet switch");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS("REALTEK_DSA");