include/hw/timer/a9gtimer.h

   1 /*
   2  * Global peripheral timer block for ARM A9MP
   3  *
   4  * (C) 2013 Xilinx Inc.
   5  *
   6  * Written by François LEGAL
   7  * Written by Peter Crosthwaite <peter.crosthwaite@xilinx.com>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version
  12  * 2 of the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #ifndef A9GTIMER_H
  24 #define A9GTIMER_H
  25
  26 #include "hw/sysbus.h"
  27 #include "qom/object.h"
  28
  29 #define A9_GTIMER_MAX_CPUS 4
  30
  31 #define TYPE_A9_GTIMER "arm.cortex-a9-global-timer"
  32 OBJECT_DECLARE_SIMPLE_TYPE(A9GTimerState, A9_GTIMER)
  33
  34 #define R_COUNTER_LO                0x00
  35 #define R_COUNTER_HI                0x04
  36
  37 #define R_CONTROL                   0x08
  38 #define R_CONTROL_TIMER_ENABLE      (1 << 0)
  39 #define R_CONTROL_COMP_ENABLE       (1 << 1)
  40 #define R_CONTROL_IRQ_ENABLE        (1 << 2)
  41 #define R_CONTROL_AUTO_INCREMENT    (1 << 3)
  42 #define R_CONTROL_PRESCALER_SHIFT   8
  43 #define R_CONTROL_PRESCALER_LEN     8
  44 #define R_CONTROL_PRESCALER_MASK    (((1 << R_CONTROL_PRESCALER_LEN) - 1) << \
  45                                      R_CONTROL_PRESCALER_SHIFT)
  46
  47 #define R_CONTROL_BANKED            (R_CONTROL_COMP_ENABLE | \
  48                                      R_CONTROL_IRQ_ENABLE | \
  49                                      R_CONTROL_AUTO_INCREMENT)
  50 #define R_CONTROL_NEEDS_SYNC        (R_CONTROL_TIMER_ENABLE | \
  51                                      R_CONTROL_PRESCALER_MASK)
  52
  53 #define R_INTERRUPT_STATUS          0x0C
  54 #define R_COMPARATOR_LO             0x10
  55 #define R_COMPARATOR_HI             0x14
  56 #define R_AUTO_INCREMENT            0x18
  57
  58 typedef struct A9GTimerPerCPU A9GTimerPerCPU;
  59
  60 struct A9GTimerPerCPU {
  61     A9GTimerState *parent;
  62
  63     uint32_t control; /* only per cpu banked bits valid */
  64     uint64_t compare;
  65     uint32_t status;
  66     uint32_t inc;
  67
  68     MemoryRegion iomem;
  69     qemu_irq irq; /* PPI interrupts */
  70 };
  71
  72 struct A9GTimerState {
  73     /*< private >*/
  74     SysBusDevice parent_obj;
  75     /*< public >*/
  76
  77     MemoryRegion iomem;
  78     /* static props */
  79     uint32_t num_cpu;
  80
  81     QEMUTimer *timer;
  82
  83     uint64_t counter; /* current timer value */
  84
  85     uint64_t ref_counter;
  86     uint64_t cpu_ref_time; /* the cpu time as of last update of ref_counter */
  87     uint32_t control; /* only non per cpu banked bits valid */
  88
  89     A9GTimerPerCPU per_cpu[A9_GTIMER_MAX_CPUS];
  90 };
  91
  92 typedef struct A9GTimerUpdate {
  93     uint64_t now;
  94     uint64_t new;
  95 } A9GTimerUpdate;
  96
  97 #endif /* A9GTIMER_H */