include/clocksource/timer-xilinx.h

   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         u64 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 */