1 | /* |
---|
2 | * Copyright (c) 2014 embedded brains GmbH. All rights reserved. |
---|
3 | * |
---|
4 | * embedded brains GmbH |
---|
5 | * Dornierstr. 4 |
---|
6 | * 82178 Puchheim |
---|
7 | * Germany |
---|
8 | * <rtems@embedded-brains.de> |
---|
9 | * |
---|
10 | * The license and distribution terms for this file may be |
---|
11 | * found in the file LICENSE in this distribution or at |
---|
12 | * http://www.rtems.org/license/LICENSE. |
---|
13 | */ |
---|
14 | |
---|
15 | #include <leon.h> |
---|
16 | |
---|
17 | #include <rtems/counter.h> |
---|
18 | |
---|
19 | static volatile struct gptimer_regs *adev_to_gpt(struct ambapp_dev *adev) |
---|
20 | { |
---|
21 | return (volatile struct gptimer_regs *) DEV_TO_APB(adev)->start; |
---|
22 | } |
---|
23 | |
---|
24 | static CPU_Counter_ticks timestamp_counter_difference( |
---|
25 | CPU_Counter_ticks second, |
---|
26 | CPU_Counter_ticks first |
---|
27 | ) |
---|
28 | { |
---|
29 | return second - first; |
---|
30 | } |
---|
31 | |
---|
32 | static CPU_Counter_ticks free_counter_difference( |
---|
33 | CPU_Counter_ticks second, |
---|
34 | CPU_Counter_ticks first |
---|
35 | ) |
---|
36 | { |
---|
37 | return first - second; |
---|
38 | } |
---|
39 | |
---|
40 | static CPU_Counter_ticks clock_counter_difference( |
---|
41 | CPU_Counter_ticks second, |
---|
42 | CPU_Counter_ticks first |
---|
43 | ) |
---|
44 | { |
---|
45 | CPU_Counter_ticks period = rtems_configuration_get_microseconds_per_tick(); |
---|
46 | |
---|
47 | return (first + period - second) % period; |
---|
48 | } |
---|
49 | |
---|
50 | static void gpt_counter_initialize( |
---|
51 | volatile struct gptimer_regs *gpt, |
---|
52 | size_t timer_index, |
---|
53 | uint32_t frequency, |
---|
54 | SPARC_Counter_difference counter_difference |
---|
55 | ) |
---|
56 | { |
---|
57 | _SPARC_Counter_initialize( |
---|
58 | (volatile const uint32_t *) &gpt->timer[timer_index].value, |
---|
59 | counter_difference |
---|
60 | ); |
---|
61 | |
---|
62 | rtems_counter_initialize_converter(frequency); |
---|
63 | } |
---|
64 | |
---|
65 | static unsigned int get_tstamp(volatile struct irqmp_timestamp_regs *irqmp_ts) |
---|
66 | { |
---|
67 | return irqmp_ts->control >> 27; |
---|
68 | } |
---|
69 | |
---|
70 | void leon3_cpu_counter_initialize(void) |
---|
71 | { |
---|
72 | volatile struct irqmp_timestamp_regs *irqmp_ts = |
---|
73 | &LEON3_IrqCtrl_Regs->timestamp[0]; |
---|
74 | struct ambapp_dev *adev; |
---|
75 | int idx = 1; |
---|
76 | |
---|
77 | if (leon3_irqmp_has_timestamp(irqmp_ts)) { |
---|
78 | /* Use the interrupt controller timestamp counter if available */ |
---|
79 | |
---|
80 | /* Enable interrupt timestamping for an arbitrary interrupt line */ |
---|
81 | irqmp_ts->control = 0x1; |
---|
82 | |
---|
83 | _SPARC_Counter_initialize( |
---|
84 | (volatile const uint32_t *) &irqmp_ts->counter, |
---|
85 | timestamp_counter_difference |
---|
86 | ); |
---|
87 | |
---|
88 | /* Get and set the frequency */ |
---|
89 | adev = (void *) ambapp_for_each( |
---|
90 | &ambapp_plb, |
---|
91 | OPTIONS_ALL | OPTIONS_APB_SLVS, |
---|
92 | VENDOR_GAISLER, |
---|
93 | GAISLER_IRQMP, |
---|
94 | ambapp_find_by_idx, |
---|
95 | NULL |
---|
96 | ); |
---|
97 | rtems_counter_initialize_converter(ambapp_freq_get(&ambapp_plb, adev)); |
---|
98 | } else { |
---|
99 | adev = (void *) ambapp_for_each( |
---|
100 | &ambapp_plb, |
---|
101 | OPTIONS_ALL | OPTIONS_APB_SLVS, |
---|
102 | VENDOR_GAISLER, |
---|
103 | GAISLER_GPTIMER, |
---|
104 | ambapp_find_by_idx, |
---|
105 | &idx |
---|
106 | ); |
---|
107 | if (adev != NULL) { |
---|
108 | /* Use the second GPTIMER if available */ |
---|
109 | volatile struct gptimer_regs *gpt = adev_to_gpt(adev); |
---|
110 | uint32_t max_frequency = ambapp_freq_get(&ambapp_plb, adev); |
---|
111 | unsigned min_prescaler = 8; |
---|
112 | uint32_t frequency = max_frequency / min_prescaler; |
---|
113 | |
---|
114 | gpt->scaler_reload = min_prescaler - 1; |
---|
115 | gpt->timer[0].reload = 0xffffffff; |
---|
116 | gpt->timer[0].ctrl = LEON3_GPTIMER_EN | LEON3_GPTIMER_RL |
---|
117 | | LEON3_GPTIMER_LD; |
---|
118 | |
---|
119 | gpt_counter_initialize(gpt, 0, frequency, free_counter_difference); |
---|
120 | } else if (LEON3_Timer_Regs != NULL) { |
---|
121 | /* Fall back to the first GPTIMER if available */ |
---|
122 | gpt_counter_initialize( |
---|
123 | LEON3_Timer_Regs, |
---|
124 | LEON3_CLOCK_INDEX, |
---|
125 | LEON3_GPTIMER_0_FREQUENCY_SET_BY_BOOT_LOADER, |
---|
126 | clock_counter_difference |
---|
127 | ); |
---|
128 | } |
---|
129 | } |
---|
130 | } |
---|