/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
/*
 * DSA driver for:
 * Hirschmann Hellcreek TSN switch.
 *
 * Copyright (C) 2019-2021 Linutronix GmbH
 * Author Kurt Kanzenbach <kurt@linutronix.de>
 */

#ifndef _HELLCREEK_H_
#define _HELLCREEK_H_

#include <linux/bitmap.h>
#include <linux/bitops.h>
#include <linux/container_of.h>
#include <linux/device.h>
#include <linux/leds.h>
#include <linux/mutex.h>
#include <linux/platform_data/hirschmann-hellcreek.h>
#include <linux/ptp_clock_kernel.h>
#include <linux/timecounter.h>
#include <linux/types.h>
#include <linux/workqueue.h>

#include <net/dsa.h>
#include <net/pkt_sched.h>

/* Ports:
 *  - 0: CPU
 *  - 1: Tunnel
 *  - 2: TSN front port 1
 *  - 3: TSN front port 2
 *  - ...
 */
#define CPU_PORT                        0
#define TUNNEL_PORT                     1

#define HELLCREEK_VLAN_NO_MEMBER        0x0
#define HELLCREEK_VLAN_UNTAGGED_MEMBER  0x1
#define HELLCREEK_VLAN_TAGGED_MEMBER    0x3
#define HELLCREEK_NUM_EGRESS_QUEUES     8
#define HELLCREEK_DEFAULT_MAX_SDU       1536

/* Register definitions */
#define HR_MODID_C                      (0 * 2)
#define HR_REL_L_C                      (1 * 2)
#define HR_REL_H_C                      (2 * 2)
#define HR_BLD_L_C                      (3 * 2)
#define HR_BLD_H_C                      (4 * 2)
#define HR_CTRL_C                       (5 * 2)
#define HR_CTRL_C_READY                 BIT(14)
#define HR_CTRL_C_TRANSITION            BIT(13)
#define HR_CTRL_C_ENABLE                BIT(0)

#define HR_PSEL                         (0xa6 * 2)
#define HR_PSEL_PTWSEL_SHIFT            4
#define HR_PSEL_PTWSEL_MASK             GENMASK(5, 4)
#define HR_PSEL_PRTCWSEL_SHIFT          0
#define HR_PSEL_PRTCWSEL_MASK           GENMASK(2, 0)

#define HR_PTCFG                        (0xa7 * 2)
#define HR_PTCFG_MLIMIT_EN              BIT(13)
#define HR_PTCFG_UMC_FLT                BIT(10)
#define HR_PTCFG_UUC_FLT                BIT(9)
#define HR_PTCFG_UNTRUST                BIT(8)
#define HR_PTCFG_TAG_REQUIRED           BIT(7)
#define HR_PTCFG_PPRIO_SHIFT            4
#define HR_PTCFG_PPRIO_MASK             GENMASK(6, 4)
#define HR_PTCFG_INGRESSFLT             BIT(3)
#define HR_PTCFG_BLOCKED                BIT(2)
#define HR_PTCFG_LEARNING_EN            BIT(1)
#define HR_PTCFG_ADMIN_EN               BIT(0)

#define HR_PRTCCFG                      (0xa8 * 2)
#define HR_PRTCCFG_PCP_TC_MAP_SHIFT     0
#define HR_PRTCCFG_PCP_TC_MAP_MASK      GENMASK(2, 0)

#define HR_PTPRTCCFG                    (0xa9 * 2)
#define HR_PTPRTCCFG_SET_QTRACK         BIT(15)
#define HR_PTPRTCCFG_REJECT             BIT(14)
#define HR_PTPRTCCFG_MAXSDU_SHIFT       0
#define HR_PTPRTCCFG_MAXSDU_MASK        GENMASK(10, 0)

#define HR_CSEL                         (0x8d * 2)
#define HR_CSEL_SHIFT                   0
#define HR_CSEL_MASK                    GENMASK(7, 0)
#define HR_CRDL                         (0x8e * 2)
#define HR_CRDH                         (0x8f * 2)

#define HR_SWTRC_CFG                    (0x90 * 2)
#define HR_SWTRC0                       (0x91 * 2)
#define HR_SWTRC1                       (0x92 * 2)
#define HR_PFREE                        (0x93 * 2)
#define HR_MFREE                        (0x94 * 2)

#define HR_FDBAGE                       (0x97 * 2)
#define HR_FDBMAX                       (0x98 * 2)
#define HR_FDBRDL                       (0x99 * 2)
#define HR_FDBRDM                       (0x9a * 2)
#define HR_FDBRDH                       (0x9b * 2)

#define HR_FDBMDRD                      (0x9c * 2)
#define HR_FDBMDRD_PORTMASK_SHIFT       0
#define HR_FDBMDRD_PORTMASK_MASK        GENMASK(3, 0)
#define HR_FDBMDRD_AGE_SHIFT            4
#define HR_FDBMDRD_AGE_MASK             GENMASK(7, 4)
#define HR_FDBMDRD_OBT                  BIT(8)
#define HR_FDBMDRD_PASS_BLOCKED         BIT(9)
#define HR_FDBMDRD_STATIC               BIT(11)
#define HR_FDBMDRD_REPRIO_TC_SHIFT      12
#define HR_FDBMDRD_REPRIO_TC_MASK       GENMASK(14, 12)
#define HR_FDBMDRD_REPRIO_EN            BIT(15)

#define HR_FDBWDL                       (0x9d * 2)
#define HR_FDBWDM                       (0x9e * 2)
#define HR_FDBWDH                       (0x9f * 2)
#define HR_FDBWRM0                      (0xa0 * 2)
#define HR_FDBWRM0_PORTMASK_SHIFT       0
#define HR_FDBWRM0_PORTMASK_MASK        GENMASK(3, 0)
#define HR_FDBWRM0_OBT                  BIT(8)
#define HR_FDBWRM0_PASS_BLOCKED         BIT(9)
#define HR_FDBWRM0_REPRIO_TC_SHIFT      12
#define HR_FDBWRM0_REPRIO_TC_MASK       GENMASK(14, 12)
#define HR_FDBWRM0_REPRIO_EN            BIT(15)
#define HR_FDBWRM1                      (0xa1 * 2)

#define HR_FDBWRCMD                     (0xa2 * 2)
#define HR_FDBWRCMD_FDBDEL              BIT(9)

#define HR_SWCFG                        (0xa3 * 2)
#define HR_SWCFG_GM_STATEMD             BIT(15)
#define HR_SWCFG_LAS_MODE_SHIFT         12
#define HR_SWCFG_LAS_MODE_MASK          GENMASK(13, 12)
#define HR_SWCFG_LAS_OFF                (0x00)
#define HR_SWCFG_LAS_ON                 (0x01)
#define HR_SWCFG_LAS_STATIC             (0x10)
#define HR_SWCFG_CT_EN                  BIT(11)
#define HR_SWCFG_VLAN_UNAWARE           BIT(10)
#define HR_SWCFG_ALWAYS_OBT             BIT(9)
#define HR_SWCFG_FDBAGE_EN              BIT(5)
#define HR_SWCFG_FDBLRN_EN              BIT(4)

#define HR_SWSTAT                       (0xa4 * 2)
#define HR_SWSTAT_FAIL                  BIT(4)
#define HR_SWSTAT_BUSY                  BIT(0)

#define HR_SWCMD                        (0xa5 * 2)
#define HW_SWCMD_FLUSH                  BIT(0)

#define HR_VIDCFG                       (0xaa * 2)
#define HR_VIDCFG_VID_SHIFT             0
#define HR_VIDCFG_VID_MASK              GENMASK(11, 0)
#define HR_VIDCFG_PVID                  BIT(12)

#define HR_VIDMBRCFG                    (0xab * 2)
#define HR_VIDMBRCFG_P0MBR_SHIFT        0
#define HR_VIDMBRCFG_P0MBR_MASK         GENMASK(1, 0)
#define HR_VIDMBRCFG_P1MBR_SHIFT        2
#define HR_VIDMBRCFG_P1MBR_MASK         GENMASK(3, 2)
#define HR_VIDMBRCFG_P2MBR_SHIFT        4
#define HR_VIDMBRCFG_P2MBR_MASK         GENMASK(5, 4)
#define HR_VIDMBRCFG_P3MBR_SHIFT        6
#define HR_VIDMBRCFG_P3MBR_MASK         GENMASK(7, 6)

#define HR_FEABITS0                     (0xac * 2)
#define HR_FEABITS0_FDBBINS_SHIFT       4
#define HR_FEABITS0_FDBBINS_MASK        GENMASK(7, 4)
#define HR_FEABITS0_PCNT_SHIFT          8
#define HR_FEABITS0_PCNT_MASK           GENMASK(11, 8)
#define HR_FEABITS0_MCNT_SHIFT          12
#define HR_FEABITS0_MCNT_MASK           GENMASK(15, 12)

#define TR_QTRACK                       (0xb1 * 2)
#define TR_TGDVER                       (0xb3 * 2)
#define TR_TGDVER_REV_MIN_MASK          GENMASK(7, 0)
#define TR_TGDVER_REV_MIN_SHIFT         0
#define TR_TGDVER_REV_MAJ_MASK          GENMASK(15, 8)
#define TR_TGDVER_REV_MAJ_SHIFT         8
#define TR_TGDSEL                       (0xb4 * 2)
#define TR_TGDSEL_TDGSEL_MASK           GENMASK(1, 0)
#define TR_TGDSEL_TDGSEL_SHIFT          0
#define TR_TGDCTRL                      (0xb5 * 2)
#define TR_TGDCTRL_GATE_EN              BIT(0)
#define TR_TGDCTRL_CYC_SNAP             BIT(4)
#define TR_TGDCTRL_SNAP_EST             BIT(5)
#define TR_TGDCTRL_ADMINGATESTATES_MASK GENMASK(15, 8)
#define TR_TGDCTRL_ADMINGATESTATES_SHIFT        8
#define TR_TGDSTAT0                     (0xb6 * 2)
#define TR_TGDSTAT1                     (0xb7 * 2)
#define TR_ESTWRL                       (0xb8 * 2)
#define TR_ESTWRH                       (0xb9 * 2)
#define TR_ESTCMD                       (0xba * 2)
#define TR_ESTCMD_ESTSEC_MASK           GENMASK(2, 0)
#define TR_ESTCMD_ESTSEC_SHIFT          0
#define TR_ESTCMD_ESTARM                BIT(4)
#define TR_ESTCMD_ESTSWCFG              BIT(5)
#define TR_EETWRL                       (0xbb * 2)
#define TR_EETWRH                       (0xbc * 2)
#define TR_EETCMD                       (0xbd * 2)
#define TR_EETCMD_EETSEC_MASK           GEMASK(2, 0)
#define TR_EETCMD_EETSEC_SHIFT          0
#define TR_EETCMD_EETARM                BIT(4)
#define TR_CTWRL                        (0xbe * 2)
#define TR_CTWRH                        (0xbf * 2)
#define TR_LCNSL                        (0xc1 * 2)
#define TR_LCNSH                        (0xc2 * 2)
#define TR_LCS                          (0xc3 * 2)
#define TR_GCLDAT                       (0xc4 * 2)
#define TR_GCLDAT_GCLWRGATES_MASK       GENMASK(7, 0)
#define TR_GCLDAT_GCLWRGATES_SHIFT      0
#define TR_GCLDAT_GCLWRLAST             BIT(8)
#define TR_GCLDAT_GCLOVRI               BIT(9)
#define TR_GCLTIL                       (0xc5 * 2)
#define TR_GCLTIH                       (0xc6 * 2)
#define TR_GCLCMD                       (0xc7 * 2)
#define TR_GCLCMD_GCLWRADR_MASK         GENMASK(7, 0)
#define TR_GCLCMD_GCLWRADR_SHIFT        0
#define TR_GCLCMD_INIT_GATE_STATES_MASK GENMASK(15, 8)
#define TR_GCLCMD_INIT_GATE_STATES_SHIFT        8

struct hellcreek_counter {
        u8 offset;
        const char *name;
};

struct hellcreek;

/* State flags for hellcreek_port_hwtstamp::state */
enum {
        HELLCREEK_HWTSTAMP_ENABLED,
        HELLCREEK_HWTSTAMP_TX_IN_PROGRESS,
};

/* A structure to hold hardware timestamping information per port */
struct hellcreek_port_hwtstamp {
        /* Timestamping state */
        unsigned long state;

        /* Resources for receive timestamping */
        struct sk_buff_head rx_queue; /* For synchronization messages */

        /* Resources for transmit timestamping */
        unsigned long tx_tstamp_start;
        struct sk_buff *tx_skb;

        /* Current timestamp configuration */
        struct kernel_hwtstamp_config tstamp_config;
};

struct hellcreek_port {
        struct hellcreek *hellcreek;
        unsigned long *vlan_dev_bitmap;
        int port;
        u16 ptcfg;              /* ptcfg shadow */
        u64 *counter_values;

        /* Per-port timestamping resources */
        struct hellcreek_port_hwtstamp port_hwtstamp;

        /* Per-port Qbv schedule information */
        struct tc_taprio_qopt_offload *current_schedule;
        struct delayed_work schedule_work;
};

struct hellcreek_fdb_entry {
        size_t idx;
        unsigned char mac[ETH_ALEN];
        u8 portmask;
        u8 age;
        u8 is_obt;
        u8 pass_blocked;
        u8 is_static;
        u8 reprio_tc;
        u8 reprio_en;
};

struct hellcreek {
        const struct hellcreek_platform_data *pdata;
        struct device *dev;
        struct dsa_switch *ds;
        struct ptp_clock *ptp_clock;
        struct ptp_clock_info ptp_clock_info;
        struct hellcreek_port *ports;
        struct delayed_work overflow_work;
        struct led_classdev led_is_gm;
        struct led_classdev led_sync_good;
        struct mutex reg_lock;  /* Switch IP register lock */
        struct mutex vlan_lock; /* VLAN bitmaps lock */
        struct mutex ptp_lock;  /* PTP IP register lock */
        struct devlink_region *vlan_region;
        struct devlink_region *fdb_region;
        void __iomem *base;
        void __iomem *ptp_base;
        u16 swcfg;              /* swcfg shadow */
        u8 *vidmbrcfg;          /* vidmbrcfg shadow */
        u64 seconds;            /* PTP seconds */
        u64 last_ts;            /* Used for overflow detection */
        u16 status_out;         /* ptp.status_out shadow */
        size_t fdb_entries;
};

/* A Qbv schedule can only started up to 8 seconds in the future. If the delta
 * between the base time and the current ptp time is larger than 8 seconds, then
 * use periodic work to check for the schedule to be started. The delayed work
 * cannot be armed directly to $base_time - 8 + X, because for large deltas the
 * PTP frequency matters.
 */
#define HELLCREEK_SCHEDULE_PERIOD       (2 * HZ)
#define dw_to_hellcreek_port(dw)                                \
        container_of(dw, struct hellcreek_port, schedule_work)

/* Devlink resources */
enum hellcreek_devlink_resource_id {
        HELLCREEK_DEVLINK_PARAM_ID_VLAN_TABLE,
        HELLCREEK_DEVLINK_PARAM_ID_FDB_TABLE,
};

struct hellcreek_devlink_vlan_entry {
        u16 vid;
        u16 member;
};

#endif /* _HELLCREEK_H_ */