// 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/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/of_irq.h>
#include <linux/regmap.h>

#include "realtek-smi.h"

#define RTL8366RB_PORT_NUM_CPU          5
#define RTL8366RB_NUM_PORTS             6
#define RTL8366RB_PHY_NO_MAX            4
#define RTL8366RB_PHY_ADDR_MAX          31

/* 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_9216          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 Security Control registers */
#define RTL8366RB_SSCR0                         0x0002
#define RTL8366RB_SSCR1                         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)

#define RTL8366RB_PAACR_CPU_PORT        (RTL8366RB_PAACR_SPEED_1000M | \
                                         RTL8366RB_PAACR_FULL_DUPLEX | \
                                         RTL8366RB_PAACR_LINK_UP | \
                                         RTL8366RB_PAACR_TX_PAUSE | \
                                         RTL8366RB_PAACR_RX_PAUSE)

/* 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

/* CPU port control reg */
#define RTL8368RB_CPU_CTRL_REG          0x0061
#define RTL8368RB_CPU_PORTS_MSK         0x00FF
/* Enables inserting custom tag length/type 0x8899 */
#define RTL8368RB_CPU_INSTAG            BIT(15)

#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)

#define RTL8366RB_VLAN_INGRESS_CTRL2_REG        0x037f

/* LED control registers */
#define RTL8366RB_LED_BLINKRATE_REG             0x0430
#define RTL8366RB_LED_BLINKRATE_MASK            0x0007
#define RTL8366RB_LED_BLINKRATE_28MS            0x0000
#define RTL8366RB_LED_BLINKRATE_56MS            0x0001
#define RTL8366RB_LED_BLINKRATE_84MS            0x0002
#define RTL8366RB_LED_BLINKRATE_111MS           0x0003
#define RTL8366RB_LED_BLINKRATE_222MS           0x0004
#define RTL8366RB_LED_BLINKRATE_446MS           0x0005

#define RTL8366RB_LED_CTRL_REG                  0x0431
#define RTL8366RB_LED_OFF                       0x0
#define RTL8366RB_LED_DUP_COL                   0x1
#define RTL8366RB_LED_LINK_ACT                  0x2
#define RTL8366RB_LED_SPD1000                   0x3
#define RTL8366RB_LED_SPD100                    0x4
#define RTL8366RB_LED_SPD10                     0x5
#define RTL8366RB_LED_SPD1000_ACT               0x6
#define RTL8366RB_LED_SPD100_ACT                0x7
#define RTL8366RB_LED_SPD10_ACT                 0x8
#define RTL8366RB_LED_SPD100_10_ACT             0x9
#define RTL8366RB_LED_FIBER                     0xa
#define RTL8366RB_LED_AN_FAULT                  0xb
#define RTL8366RB_LED_LINK_RX                   0xc
#define RTL8366RB_LED_LINK_TX                   0xd
#define RTL8366RB_LED_MASTER                    0xe
#define RTL8366RB_LED_FORCE                     0xf
#define RTL8366RB_LED_0_1_CTRL_REG              0x0432
#define RTL8366RB_LED_1_OFFSET                  6
#define RTL8366RB_LED_2_3_CTRL_REG              0x0433
#define RTL8366RB_LED_3_OFFSET                  6

#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_LEDGROUPS         4
#define RTL8366RB_NUM_VIDS              4096
#define RTL8366RB_PRIORITYMAX           7
#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 */

/* 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_smi *smi,
                                     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(smi->map, addr, 0); /* Write whatever */
        if (ret)
                return ret;

        /* Read MIB control register */
        ret = regmap_read(smi->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(smi->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_smi *smi = irq_data_get_irq_chip_data(d);
        int ret;

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

static void rtl8366rb_unmask_irq(struct irq_data *d)
{
        struct realtek_smi *smi = irq_data_get_irq_chip_data(d);
        int ret;

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

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

        /* This clears the IRQ status register */
        ret = regmap_read(smi->map, RTL8366RB_INTERRUPT_STATUS_REG,
                          &stat);
        if (ret) {
                dev_err(smi->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(smi->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_smi *smi)
{
        struct device_node *intc;
        unsigned long irq_trig;
        int irq;
        int ret;
        u32 val;
        int i;

        intc = of_get_child_by_name(smi->dev->of_node, "interrupt-controller");
        if (!intc) {
                dev_err(smi->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(smi->dev, "failed to get parent IRQ\n");
                return irq ? irq : -EINVAL;
        }

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

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

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

        return 0;
}

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

        eth_random_addr(addr);

        dev_info(smi->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(smi->map, RTL8366RB_SMAR0, val);
        if (ret)
                return ret;
        val = addr[2] << 8 | addr[3];
        ret = regmap_write(smi->map, RTL8366RB_SMAR1, val);
        if (ret)
                return ret;
        val = addr[4] << 8 | addr[5];
        ret = regmap_write(smi->map, RTL8366RB_SMAR2, val);
        if (ret)
                return ret;

        return 0;
}

/* Found in a vendor driver */

/* For the "version 0" early silicon, appear in most source releases */
static const u16 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 u16 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 u16 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 u16 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 u16 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 u16 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 u16 rtl8366rb_green_jam[][2] = {
        {0xBE78, 0x323C}, {0xBE77, 0x5000}, {0xBE2E, 0x7BA7},
        {0xBE59, 0x3459}, {0xBE5A, 0x745A}, {0xBE5B, 0x785C},
        {0xBE5C, 0x785C}, {0xBE6E, 0xE120}, {0xBE79, 0x323C},
};

static int rtl8366rb_setup(struct dsa_switch *ds)
{
        struct realtek_smi *smi = ds->priv;
        const u16 *jam_table;
        u32 chip_ver = 0;
        u32 chip_id = 0;
        int jam_size;
        u32 val;
        int ret;
        int i;

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

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

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

        dev_info(smi->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);
        }

        i = 0;
        while (i < jam_size) {
                if ((jam_table[i] & 0xBE00) == 0xBE00) {
                        ret = regmap_read(smi->map,
                                          RTL8366RB_PHY_ACCESS_BUSY_REG,
                                          &val);
                        if (ret)
                                return ret;
                        if (!(val & RTL8366RB_PHY_INT_BUSY)) {
                                ret = regmap_write(smi->map,
                                                RTL8366RB_PHY_ACCESS_CTRL_REG,
                                                RTL8366RB_PHY_CTRL_WRITE);
                                if (ret)
                                        return ret;
                        }
                }
                dev_dbg(smi->dev, "jam %04x into register %04x\n",
                        jam_table[i + 1],
                        jam_table[i]);
                ret = regmap_write(smi->map,
                                   jam_table[i],
                                   jam_table[i + 1]);
                if (ret)
                        return ret;
                i += 2;
        }

        /* Set up the "green ethernet" feature */
        i = 0;
        while (i < ARRAY_SIZE(rtl8366rb_green_jam)) {
                ret = regmap_read(smi->map, RTL8366RB_PHY_ACCESS_BUSY_REG,
                                  &val);
                if (ret)
                        return ret;
                if (!(val & RTL8366RB_PHY_INT_BUSY)) {
                        ret = regmap_write(smi->map,
                                           RTL8366RB_PHY_ACCESS_CTRL_REG,
                                           RTL8366RB_PHY_CTRL_WRITE);
                        if (ret)
                                return ret;
                        ret = regmap_write(smi->map,
                                           rtl8366rb_green_jam[i][0],
                                           rtl8366rb_green_jam[i][1]);
                        if (ret)
                                return ret;
                        i++;
                }
        }
        ret = regmap_write(smi->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(smi->map, 0x0c, 0x240);
        if (ret)
                return ret;
        ret = regmap_write(smi->map, 0x0d, 0x240);
        if (ret)
                return ret;

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

        /* Enable CPU port and enable inserting CPU tag
         *
         * Disabling RTL8368RB_CPU_INSTAG here will change the behaviour
         * of the switch totally and it will start talking Realtek RRCP
         * internally. It is probably possible to experiment with this,
         * but then the kernel needs to understand and handle RRCP first.
         */
        ret = regmap_update_bits(smi->map, RTL8368RB_CPU_CTRL_REG,
                                 0xFFFF,
                                 RTL8368RB_CPU_INSTAG | BIT(smi->cpu_port));
        if (ret)
                return ret;

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

        /* Set maximum packet length to 1536 bytes */
        ret = regmap_update_bits(smi->map, RTL8366RB_SGCR,
                                 RTL8366RB_SGCR_MAX_LENGTH_MASK,
                                 RTL8366RB_SGCR_MAX_LENGTH_1536);
        if (ret)
                return ret;

        /* Enable learning for all ports */
        ret = regmap_write(smi->map, RTL8366RB_SSCR0, 0);
        if (ret)
                return ret;

        /* Enable auto ageing for all ports */
        ret = regmap_write(smi->map, RTL8366RB_SSCR1, 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(smi->map, RTL8366RB_PMC0,
                                 RTL8366RB_PMC0_P4_IOMODE_MASK,
                                 0 << RTL8366RB_PMC0_P4_IOMODE_SHIFT);
        if (ret)
                return ret;

        /* Discard VLAN tagged packets if the port is not a member of
         * the VLAN with which the packets is associated.
         */
        ret = regmap_write(smi->map, RTL8366RB_VLAN_INGRESS_CTRL2_REG,
                           RTL8366RB_PORT_ALL);
        if (ret)
                return ret;

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

        /* Set blinking, TODO: make this configurable */
        ret = regmap_update_bits(smi->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, we configure all ports to the same
         * behaviour (no individual config) but we can set up each
         * LED separately.
         */
        if (smi->leds_disabled) {
                /* Turn everything off */
                regmap_update_bits(smi->map,
                                   RTL8366RB_LED_0_1_CTRL_REG,
                                   0x0FFF, 0);
                regmap_update_bits(smi->map,
                                   RTL8366RB_LED_2_3_CTRL_REG,
                                   0x0FFF, 0);
                regmap_update_bits(smi->map,
                                   RTL8366RB_INTERRUPT_CONTROL_REG,
                                   RTL8366RB_P4_RGMII_LED,
                                   0);
                val = RTL8366RB_LED_OFF;
        } else {
                /* TODO: make this configurable per LED */
                val = RTL8366RB_LED_FORCE;
        }
        for (i = 0; i < 4; i++) {
                ret = regmap_update_bits(smi->map,
                                         RTL8366RB_LED_CTRL_REG,
                                         0xf << (i * 4),
                                         val << (i * 4));
                if (ret)
                        return ret;
        }

        ret = rtl8366_init_vlan(smi);
        if (ret)
                return ret;

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

        ret = realtek_smi_setup_mdio(smi);
        if (ret) {
                dev_info(smi->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)
{
        /* For now, the RTL switches are handled without any custom tags.
         *
         * It is possible to turn on "custom tags" by removing the
         * RTL8368RB_CPU_INSTAG flag when enabling the port but what it
         * does is unfamiliar to DSA: ethernet frames of type 8899, the Realtek
         * Remote Control Protocol (RRCP) start to appear on the CPU port of
         * the device. So this is not the ordinary few extra bytes in the
         * frame. Instead it appears that the switch starts to talk Realtek
         * RRCP internally which means a pretty complex RRCP implementation
         * decoding and responding the RRCP protocol is needed to exploit this.
         *
         * The OpenRRCP project (dormant since 2009) have reverse-egineered
         * parts of the protocol.
         */
        return DSA_TAG_PROTO_NONE;
}

static void rtl8366rb_adjust_link(struct dsa_switch *ds, int port,
                                  struct phy_device *phydev)
{
        struct realtek_smi *smi = ds->priv;
        int ret;

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

        dev_info(smi->dev, "adjust link on CPU port (%d)\n", port);

        /* Force the fixed CPU port into 1Gbit mode, no autonegotiation */
        ret = regmap_update_bits(smi->map, RTL8366RB_MAC_FORCE_CTRL_REG,
                                 BIT(port), BIT(port));
        if (ret)
                return;

        ret = regmap_update_bits(smi->map, RTL8366RB_PAACR2,
                                 0xFF00U,

                                 RTL8366RB_PAACR_CPU_PORT << 8);
        if (ret)
                return;

        /* Enable the CPU port */
        ret = regmap_update_bits(smi->map, RTL8366RB_PECR, BIT(port),
                                 0);
        if (ret)
                return;
}

static void rb8366rb_set_port_led(struct realtek_smi *smi,
                                  int port, bool enable)
{
        u16 val = enable ? 0x3f : 0;
        int ret;

        if (smi->leds_disabled)
                return;

        switch (port) {
        case 0:
                ret = regmap_update_bits(smi->map,
                                         RTL8366RB_LED_0_1_CTRL_REG,
                                         0x3F, val);
                break;
        case 1:
                ret = regmap_update_bits(smi->map,
                                         RTL8366RB_LED_0_1_CTRL_REG,
                                         0x3F << RTL8366RB_LED_1_OFFSET,
                                         val << RTL8366RB_LED_1_OFFSET);
                break;
        case 2:
                ret = regmap_update_bits(smi->map,
                                         RTL8366RB_LED_2_3_CTRL_REG,
                                         0x3F, val);
                break;
        case 3:
                ret = regmap_update_bits(smi->map,
                                         RTL8366RB_LED_2_3_CTRL_REG,
                                         0x3F << RTL8366RB_LED_3_OFFSET,
                                         val << RTL8366RB_LED_3_OFFSET);
                break;
        case 4:
                ret = regmap_update_bits(smi->map,
                                         RTL8366RB_INTERRUPT_CONTROL_REG,
                                         RTL8366RB_P4_RGMII_LED,
                                         enable ? RTL8366RB_P4_RGMII_LED : 0);
                break;
        default:
                dev_err(smi->dev, "no LED for port %d\n", port);
                return;
        }
        if (ret)
                dev_err(smi->dev, "error updating LED on port %d\n", port);
}

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

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

        rb8366rb_set_port_led(smi, port, true);
        return 0;
}

static void
rtl8366rb_port_disable(struct dsa_switch *ds, int port,
                       struct phy_device *phy)
{
        struct realtek_smi *smi = ds->priv;
        int ret;

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

        rb8366rb_set_port_led(smi, port, false);
}

static int rtl8366rb_get_vlan_4k(struct realtek_smi *smi, 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(smi->map, RTL8366RB_VLAN_TABLE_WRITE_BASE,
                           vid & RTL8366RB_VLAN_VID_MASK);
        if (ret)
                return ret;

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

        for (i = 0; i < 3; i++) {
                ret = regmap_read(smi->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_smi *smi,
                                 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(smi->map,
                                   RTL8366RB_VLAN_TABLE_WRITE_BASE + i,
                                   data[i]);
                if (ret)
                        return ret;
        }

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

        return ret;
}

static int rtl8366rb_get_vlan_mc(struct realtek_smi *smi, 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(smi->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_smi *smi, 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(smi->map,
                                   RTL8366RB_VLAN_MC_BASE(index) + i,
                                   data[i]);
                if (ret)
                        return ret;
        }

        return 0;
}

static int rtl8366rb_get_mc_index(struct realtek_smi *smi, int port, int *val)
{
        u32 data;
        int ret;

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

        ret = regmap_read(smi->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_smi *smi, int port, int index)
{
        if (port >= smi->num_ports || index >= RTL8366RB_NUM_VLANS)
                return -EINVAL;

        return regmap_update_bits(smi->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));
}

static bool rtl8366rb_is_vlan_valid(struct realtek_smi *smi, unsigned int vlan)
{
        unsigned int max = RTL8366RB_NUM_VLANS;

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

        if (vlan == 0 || vlan >= max)
                return false;

        return true;
}

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

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

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

        if (phy > RTL8366RB_PHY_NO_MAX)
                return -EINVAL;

        ret = regmap_write(smi->map, RTL8366RB_PHY_ACCESS_CTRL_REG,
                           RTL8366RB_PHY_CTRL_READ);
        if (ret)
                return ret;

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

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

        ret = regmap_read(smi->map, RTL8366RB_PHY_ACCESS_DATA_REG, &val);
        if (ret)
                return ret;

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

        return val;
}

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

        if (phy > RTL8366RB_PHY_NO_MAX)
                return -EINVAL;

        ret = regmap_write(smi->map, RTL8366RB_PHY_ACCESS_CTRL_REG,
                           RTL8366RB_PHY_CTRL_WRITE);
        if (ret)
                return ret;

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

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

        ret = regmap_write(smi->map, reg, val);
        if (ret)
                return ret;

        return 0;
}

static int rtl8366rb_reset_chip(struct realtek_smi *smi)
{
        int timeout = 10;
        u32 val;
        int ret;

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

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

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

        return 0;
}

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

        /* Detect device */
        ret = regmap_read(smi->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");
                smi->cpu_port = RTL8366RB_PORT_NUM_CPU;
                smi->num_ports = RTL8366RB_NUM_PORTS;
                smi->num_vlan_mc = RTL8366RB_NUM_VLANS;
                smi->mib_counters = rtl8366rb_mib_counters;
                smi->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(smi);
        if (ret)
                return ret;

        return 0;
}

static const struct dsa_switch_ops rtl8366rb_switch_ops = {
        .get_tag_protocol = rtl8366_get_tag_protocol,
        .setup = rtl8366rb_setup,
        .adjust_link = rtl8366rb_adjust_link,
        .get_strings = rtl8366_get_strings,
        .get_ethtool_stats = rtl8366_get_ethtool_stats,
        .get_sset_count = rtl8366_get_sset_count,
        .port_vlan_filtering = rtl8366_vlan_filtering,
        .port_vlan_prepare = rtl8366_vlan_prepare,
        .port_vlan_add = rtl8366_vlan_add,
        .port_vlan_del = rtl8366_vlan_del,
        .port_enable = rtl8366rb_port_enable,
        .port_disable = rtl8366rb_port_disable,
};

static const struct realtek_smi_ops rtl8366rb_smi_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_smi_variant rtl8366rb_variant = {
        .ds_ops = &rtl8366rb_switch_ops,
        .ops = &rtl8366rb_smi_ops,
        .clk_delay = 10,
        .cmd_read = 0xa9,
        .cmd_write = 0xa8,
};
EXPORT_SYMBOL_GPL(rtl8366rb_variant);