xref: /openbmc/linux/drivers/ptp/ptp_idt82p33.h (revision 5d7800d9)
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 */
115