1 | /* |
---|
2 | * Copyright (c) 2017 embedded brains GmbH. All rights reserved. |
---|
3 | * |
---|
4 | * The license and distribution terms for this file may be |
---|
5 | * found in the file LICENSE in this distribution or at |
---|
6 | * http://www.rtems.org/license/LICENSE. |
---|
7 | */ |
---|
8 | |
---|
9 | #include <bsp.h> |
---|
10 | #include <bsp/fatal.h> |
---|
11 | #include <bsp/irq.h> |
---|
12 | #include <bsp/irq-generic.h> |
---|
13 | #include <dev/clock/arm-generic-timer.h> |
---|
14 | |
---|
15 | #include <rtems/counter.h> |
---|
16 | #include <rtems/sysinit.h> |
---|
17 | #include <rtems/timecounter.h> |
---|
18 | #include <rtems/score/smpimpl.h> |
---|
19 | |
---|
20 | /* |
---|
21 | * Clock driver using the ARMv7-AR/AArch64 Generic Timer. The BSP must provide the |
---|
22 | * following function: |
---|
23 | * |
---|
24 | * void arm_generic_timer_get_config(uint32_t *frequency, uint32_t *irq); |
---|
25 | * |
---|
26 | * The BSP may optionally define ARM_GENERIC_TIMER_USE_VIRTUAL in <bsp.h> to |
---|
27 | * use the virtual timer instead of the physical timer. |
---|
28 | */ |
---|
29 | |
---|
30 | typedef struct { |
---|
31 | struct timecounter tc; |
---|
32 | uint32_t interval; |
---|
33 | rtems_vector_number irq; |
---|
34 | } arm_gt_clock_context; |
---|
35 | |
---|
36 | static arm_gt_clock_context arm_gt_clock_instance; |
---|
37 | |
---|
38 | /* This is defined in dev/clock/clockimpl.h */ |
---|
39 | void Clock_isr(rtems_irq_hdl_param arg); |
---|
40 | |
---|
41 | static void arm_gt_clock_at_tick(void) |
---|
42 | { |
---|
43 | uint64_t cval; |
---|
44 | uint32_t interval; |
---|
45 | |
---|
46 | interval = arm_gt_clock_instance.interval; |
---|
47 | cval = arm_gt_clock_get_compare_value(); |
---|
48 | cval += interval; |
---|
49 | arm_gt_clock_set_compare_value(cval); |
---|
50 | #ifdef ARM_GENERIC_TIMER_UNMASK_AT_TICK |
---|
51 | arm_gt_clock_set_control(0x1); |
---|
52 | #endif /* ARM_GENERIC_TIMER_UNMASK_AT_TICK */ |
---|
53 | } |
---|
54 | |
---|
55 | static void arm_gt_clock_handler_install(void) |
---|
56 | { |
---|
57 | rtems_status_code sc; |
---|
58 | |
---|
59 | sc = rtems_interrupt_handler_install( |
---|
60 | arm_gt_clock_instance.irq, |
---|
61 | "Clock", |
---|
62 | RTEMS_INTERRUPT_UNIQUE, |
---|
63 | (rtems_interrupt_handler) Clock_isr, |
---|
64 | NULL |
---|
65 | ); |
---|
66 | if (sc != RTEMS_SUCCESSFUL) { |
---|
67 | bsp_fatal(BSP_ARM_FATAL_GENERIC_TIMER_CLOCK_IRQ_INSTALL); |
---|
68 | } |
---|
69 | } |
---|
70 | |
---|
71 | static uint32_t arm_gt_clock_get_timecount(struct timecounter *tc) |
---|
72 | { |
---|
73 | return (uint32_t) arm_gt_clock_get_count(); |
---|
74 | } |
---|
75 | |
---|
76 | static void arm_gt_clock_gt_init(uint64_t cval) |
---|
77 | { |
---|
78 | arm_gt_clock_set_compare_value(cval); |
---|
79 | arm_gt_clock_set_control(0x1); |
---|
80 | } |
---|
81 | |
---|
82 | #if defined(RTEMS_SMP) && !defined(CLOCK_DRIVER_USE_ONLY_BOOT_PROCESSOR) |
---|
83 | static void arm_gt_clock_secondary_action(void *arg) |
---|
84 | { |
---|
85 | uint64_t *cval; |
---|
86 | |
---|
87 | cval = arg; |
---|
88 | arm_gt_clock_gt_init(*cval); |
---|
89 | bsp_interrupt_vector_enable(arm_gt_clock_instance.irq); |
---|
90 | } |
---|
91 | #endif |
---|
92 | |
---|
93 | static void arm_gt_clock_secondary_initialization(uint64_t cval) |
---|
94 | { |
---|
95 | #if defined(RTEMS_SMP) && !defined(CLOCK_DRIVER_USE_ONLY_BOOT_PROCESSOR) |
---|
96 | _SMP_Broadcast_action(arm_gt_clock_secondary_action, &cval); |
---|
97 | #endif |
---|
98 | } |
---|
99 | |
---|
100 | static void arm_gt_clock_initialize(void) |
---|
101 | { |
---|
102 | uint64_t frequency; |
---|
103 | uint64_t us_per_tick; |
---|
104 | uint32_t interval; |
---|
105 | uint64_t cval; |
---|
106 | struct timecounter *tc; |
---|
107 | |
---|
108 | tc = &arm_gt_clock_instance.tc; |
---|
109 | frequency = tc->tc_frequency; |
---|
110 | us_per_tick = rtems_configuration_get_microseconds_per_tick(); |
---|
111 | interval = (uint32_t) ((frequency * us_per_tick) / 1000000); |
---|
112 | cval = arm_gt_clock_get_count(); |
---|
113 | cval += interval; |
---|
114 | arm_gt_clock_instance.interval = interval; |
---|
115 | |
---|
116 | arm_gt_clock_gt_init(cval); |
---|
117 | arm_gt_clock_secondary_initialization(cval); |
---|
118 | |
---|
119 | tc->tc_get_timecount = arm_gt_clock_get_timecount; |
---|
120 | tc->tc_counter_mask = 0xffffffff; |
---|
121 | tc->tc_quality = RTEMS_TIMECOUNTER_QUALITY_CLOCK_DRIVER; |
---|
122 | rtems_timecounter_install(tc); |
---|
123 | } |
---|
124 | |
---|
125 | uint32_t _CPU_Counter_frequency(void) |
---|
126 | { |
---|
127 | return (uint32_t) arm_gt_clock_instance.tc.tc_frequency; |
---|
128 | } |
---|
129 | |
---|
130 | CPU_Counter_ticks _CPU_Counter_read(void) |
---|
131 | { |
---|
132 | return (uint32_t) arm_gt_clock_get_count(); |
---|
133 | } |
---|
134 | |
---|
135 | static void arm_gt_system_init(void) |
---|
136 | { |
---|
137 | #ifdef ARM_GENERIC_TIMER_SYSTEM_BASE |
---|
138 | volatile uint32_t *cntcr; |
---|
139 | |
---|
140 | cntcr = (volatile uint32_t *) ARM_GENERIC_TIMER_SYSTEM_BASE; |
---|
141 | *cntcr = ARM_GENERIC_TIMER_SYSTEM_CNTCR; |
---|
142 | #endif |
---|
143 | } |
---|
144 | |
---|
145 | static void arm_gt_clock_early_init(void) |
---|
146 | { |
---|
147 | uint32_t frequency; |
---|
148 | |
---|
149 | arm_gt_system_init(); |
---|
150 | arm_gt_clock_set_control(0x3); |
---|
151 | arm_generic_timer_get_config( |
---|
152 | &frequency, |
---|
153 | &arm_gt_clock_instance.irq |
---|
154 | ); |
---|
155 | |
---|
156 | /* |
---|
157 | * Used by _CPU_Counter_frequency() before arm_gt_clock_initialize() is |
---|
158 | * called. |
---|
159 | */ |
---|
160 | arm_gt_clock_instance.tc.tc_frequency = frequency; |
---|
161 | } |
---|
162 | |
---|
163 | RTEMS_SYSINIT_ITEM( |
---|
164 | arm_gt_clock_early_init, |
---|
165 | RTEMS_SYSINIT_CPU_COUNTER, |
---|
166 | RTEMS_SYSINIT_ORDER_FIRST |
---|
167 | ); |
---|
168 | |
---|
169 | #define Clock_driver_support_at_tick() \ |
---|
170 | arm_gt_clock_at_tick() |
---|
171 | |
---|
172 | #define Clock_driver_support_initialize_hardware() \ |
---|
173 | arm_gt_clock_initialize() |
---|
174 | |
---|
175 | #define Clock_driver_support_install_isr(isr) \ |
---|
176 | arm_gt_clock_handler_install() |
---|
177 | |
---|
178 | /* Include shared source clock driver code */ |
---|
179 | #include "../../shared/dev/clock/clockimpl.h" |
---|