drivers/ptp/ptp_idt82p33.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * PTP hardware clock driver for the IDT 82P33XXX family of clocks.
   4  *
   5  * Copyright (C) 2019 Integrated Device Technology, Inc., a Renesas Company.
   6  */
   7 #ifndef PTP_IDT82P33_H
   8 #define PTP_IDT82P33_H
   9
  10 #include <linux/ktime.h>
  11 #include <linux/mfd/idt82p33_reg.h>
  12 #include <linux/regmap.h>
  13
  14 #define FW_FILENAME     "idt82p33xxx.bin"
  15 #define MAX_PHC_PLL     (2)
  16 #define MAX_TRIG_CLK    (3)
  17 #define MAX_PER_OUT     (11)
  18 #define TOD_BYTE_COUNT  (10)
  19 #define DCO_MAX_PPB     (92000)
  20 #define MAX_MEASURMENT_COUNT    (5)
  21 #define SNAP_THRESHOLD_NS       (10000)
  22 #define IMMEDIATE_SNAP_THRESHOLD_NS (50000)
  23 #define DDCO_THRESHOLD_NS       (5)
  24 #define IDT82P33_MAX_WRITE_COUNT        (512)
  25
  26 #define PLLMASK_ADDR_HI 0xFF
  27 #define PLLMASK_ADDR_LO 0xA5
  28
  29 #define PLL0_OUTMASK_ADDR_HI    0xFF
  30 #define PLL0_OUTMASK_ADDR_LO    0xB0
  31
  32 #define PLL1_OUTMASK_ADDR_HI    0xFF
  33 #define PLL1_OUTMASK_ADDR_LO    0xB2
  34
  35 #define PLL2_OUTMASK_ADDR_HI    0xFF
  36 #define PLL2_OUTMASK_ADDR_LO    0xB4
  37
  38 #define PLL3_OUTMASK_ADDR_HI    0xFF
  39 #define PLL3_OUTMASK_ADDR_LO    0xB6
  40
  41 #define DEFAULT_PLL_MASK        (0x01)
  42 #define DEFAULT_OUTPUT_MASK_PLL0        (0xc0)
  43 #define DEFAULT_OUTPUT_MASK_PLL1        DEFAULT_OUTPUT_MASK_PLL0
  44
  45 /**
  46  * @brief Maximum absolute value for write phase offset in nanoseconds
  47  */
  48 #define WRITE_PHASE_OFFSET_LIMIT (20000l)
  49
  50 /** @brief Phase offset resolution
  51  *
  52  *  DPLL phase offset = 10^15 fs / ( System Clock  * 2^13)
  53  *                    = 10^15 fs / ( 1638400000 * 2^23)
  54  *                    = 74.5058059692382 fs
  55  */
  56 #define IDT_T0DPLL_PHASE_RESOL 74506
  57
  58 /* PTP Hardware Clock interface */
  59 struct idt82p33_channel {
  60         struct ptp_clock_info   caps;
  61         struct ptp_clock        *ptp_clock;
  62         struct idt82p33         *idt82p33;
  63         enum pll_mode           pll_mode;
  64         /* Workaround for TOD-to-output alignment issue */
  65         struct delayed_work     adjtime_work;
  66         s32                     current_freq;
  67         /* double dco mode */
  68         bool                    ddco;
  69         u8                      output_mask;
  70         /* last input trigger for extts */
  71         u8                      tod_trigger;
  72         bool                    discard_next_extts;
  73         u8                      plln;
  74         /* remember last tod_sts for extts */
  75         u8                      extts_tod_sts[TOD_BYTE_COUNT];
  76         u16                     dpll_tod_cnfg;
  77         u16                     dpll_tod_trigger;
  78         u16                     dpll_tod_sts;
  79         u16                     dpll_mode_cnfg;
  80         u16                     dpll_freq_cnfg;
  81         u16                     dpll_phase_cnfg;
  82         u16                     dpll_sync_cnfg;
  83         u16                     dpll_input_mode_cnfg;
  84 };
  85
  86 struct idt82p33 {
  87         struct idt82p33_channel channel[MAX_PHC_PLL];
  88         struct device           *dev;
  89         u8                      pll_mask;
  90         /* Polls for external time stamps */
  91         u8                      extts_mask;
  92         bool                    extts_single_shot;
  93         struct delayed_work     extts_work;
  94         /* Remember the ptp channel to report extts */
  95         struct idt82p33_channel *event_channel[MAX_PHC_PLL];
  96         /* Mutex to protect operations from being interrupted */
  97         struct mutex            *lock;
  98         struct regmap           *regmap;
  99         struct device           *mfd;
 100         /* Overhead calculation for adjtime */
 101         ktime_t                 start_time;
 102         int                     calculate_overhead_flag;
 103         s64                     tod_write_overhead_ns;
 104 };
 105
 106 /* firmware interface */
 107 struct idt82p33_fwrc {
 108         u8 hiaddr;
 109         u8 loaddr;
 110         u8 value;
 111         u8 reserved;
 112 } __packed;
 113
 114 #endif /* PTP_IDT82P33_H */