1 | /* SPDX-License-Identifier: GPL-2.0+ */ |
2 | /* |
3 | * Copyright (C) 2021 Sean Anderson <sean.anderson@seco.com> |
4 | */ |
5 | |
6 | #ifndef XILINX_TIMER_H |
7 | #define XILINX_TIMER_H |
8 | |
9 | #include <linux/compiler.h> |
10 | |
11 | #define TCSR0 0x00 |
12 | #define TLR0 0x04 |
13 | #define TCR0 0x08 |
14 | #define TCSR1 0x10 |
15 | #define TLR1 0x14 |
16 | #define TCR1 0x18 |
17 | |
18 | #define TCSR_MDT BIT(0) |
19 | #define TCSR_UDT BIT(1) |
20 | #define TCSR_GENT BIT(2) |
21 | #define TCSR_CAPT BIT(3) |
22 | #define TCSR_ARHT BIT(4) |
23 | #define TCSR_LOAD BIT(5) |
24 | #define TCSR_ENIT BIT(6) |
25 | #define TCSR_ENT BIT(7) |
26 | #define TCSR_TINT BIT(8) |
27 | #define TCSR_PWMA BIT(9) |
28 | #define TCSR_ENALL BIT(10) |
29 | #define TCSR_CASC BIT(11) |
30 | |
31 | struct clk; |
32 | struct device_node; |
33 | struct regmap; |
34 | |
35 | /** |
36 | * struct xilinx_timer_priv - Private data for Xilinx AXI timer drivers |
37 | * @map: Regmap of the device, possibly with an offset |
38 | * @clk: Parent clock |
39 | * @max: Maximum value of the counters |
40 | */ |
41 | struct xilinx_timer_priv { |
42 | struct regmap *map; |
43 | struct clk *clk; |
44 | u32 max; |
45 | }; |
46 | |
47 | /** |
48 | * xilinx_timer_tlr_cycles() - Calculate the TLR for a period specified |
49 | * in clock cycles |
50 | * @priv: The timer's private data |
51 | * @tcsr: The value of the TCSR register for this counter |
52 | * @cycles: The number of cycles in this period |
53 | * |
54 | * Callers of this function MUST ensure that @cycles is representable as |
55 | * a TLR. |
56 | * |
57 | * Return: The calculated value for TLR |
58 | */ |
59 | u32 xilinx_timer_tlr_cycles(struct xilinx_timer_priv *priv, u32 tcsr, |
60 | u64 cycles); |
61 | |
62 | /** |
63 | * xilinx_timer_get_period() - Get the current period of a counter |
64 | * @priv: The timer's private data |
65 | * @tlr: The value of TLR for this counter |
66 | * @tcsr: The value of TCSR for this counter |
67 | * |
68 | * Return: The period, in ns |
69 | */ |
70 | unsigned int xilinx_timer_get_period(struct xilinx_timer_priv *priv, |
71 | u32 tlr, u32 tcsr); |
72 | |
73 | #endif /* XILINX_TIMER_H */ |
74 | |