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bc1ce713 SA |
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 */ |