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