timer-sprd.c 4.8 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * Copyright (C) 2017 Spreadtrum Communications Inc.
  4. */
  5. #include <linux/init.h>
  6. #include <linux/interrupt.h>
  7. #include "timer-of.h"
  8. #define TIMER_NAME "sprd_timer"
  9. #define TIMER_LOAD_LO 0x0
  10. #define TIMER_LOAD_HI 0x4
  11. #define TIMER_VALUE_LO 0x8
  12. #define TIMER_VALUE_HI 0xc
  13. #define TIMER_CTL 0x10
  14. #define TIMER_CTL_PERIOD_MODE BIT(0)
  15. #define TIMER_CTL_ENABLE BIT(1)
  16. #define TIMER_CTL_64BIT_WIDTH BIT(16)
  17. #define TIMER_INT 0x14
  18. #define TIMER_INT_EN BIT(0)
  19. #define TIMER_INT_RAW_STS BIT(1)
  20. #define TIMER_INT_MASK_STS BIT(2)
  21. #define TIMER_INT_CLR BIT(3)
  22. #define TIMER_VALUE_SHDW_LO 0x18
  23. #define TIMER_VALUE_SHDW_HI 0x1c
  24. #define TIMER_VALUE_LO_MASK GENMASK(31, 0)
  25. static void sprd_timer_enable(void __iomem *base, u32 flag)
  26. {
  27. u32 val = readl_relaxed(base + TIMER_CTL);
  28. val |= TIMER_CTL_ENABLE;
  29. if (flag & TIMER_CTL_64BIT_WIDTH)
  30. val |= TIMER_CTL_64BIT_WIDTH;
  31. else
  32. val &= ~TIMER_CTL_64BIT_WIDTH;
  33. if (flag & TIMER_CTL_PERIOD_MODE)
  34. val |= TIMER_CTL_PERIOD_MODE;
  35. else
  36. val &= ~TIMER_CTL_PERIOD_MODE;
  37. writel_relaxed(val, base + TIMER_CTL);
  38. }
  39. static void sprd_timer_disable(void __iomem *base)
  40. {
  41. u32 val = readl_relaxed(base + TIMER_CTL);
  42. val &= ~TIMER_CTL_ENABLE;
  43. writel_relaxed(val, base + TIMER_CTL);
  44. }
  45. static void sprd_timer_update_counter(void __iomem *base, unsigned long cycles)
  46. {
  47. writel_relaxed(cycles & TIMER_VALUE_LO_MASK, base + TIMER_LOAD_LO);
  48. writel_relaxed(0, base + TIMER_LOAD_HI);
  49. }
  50. static void sprd_timer_enable_interrupt(void __iomem *base)
  51. {
  52. writel_relaxed(TIMER_INT_EN, base + TIMER_INT);
  53. }
  54. static void sprd_timer_clear_interrupt(void __iomem *base)
  55. {
  56. u32 val = readl_relaxed(base + TIMER_INT);
  57. val |= TIMER_INT_CLR;
  58. writel_relaxed(val, base + TIMER_INT);
  59. }
  60. static int sprd_timer_set_next_event(unsigned long cycles,
  61. struct clock_event_device *ce)
  62. {
  63. struct timer_of *to = to_timer_of(ce);
  64. sprd_timer_disable(timer_of_base(to));
  65. sprd_timer_update_counter(timer_of_base(to), cycles);
  66. sprd_timer_enable(timer_of_base(to), 0);
  67. return 0;
  68. }
  69. static int sprd_timer_set_periodic(struct clock_event_device *ce)
  70. {
  71. struct timer_of *to = to_timer_of(ce);
  72. sprd_timer_disable(timer_of_base(to));
  73. sprd_timer_update_counter(timer_of_base(to), timer_of_period(to));
  74. sprd_timer_enable(timer_of_base(to), TIMER_CTL_PERIOD_MODE);
  75. return 0;
  76. }
  77. static int sprd_timer_shutdown(struct clock_event_device *ce)
  78. {
  79. struct timer_of *to = to_timer_of(ce);
  80. sprd_timer_disable(timer_of_base(to));
  81. return 0;
  82. }
  83. static irqreturn_t sprd_timer_interrupt(int irq, void *dev_id)
  84. {
  85. struct clock_event_device *ce = (struct clock_event_device *)dev_id;
  86. struct timer_of *to = to_timer_of(ce);
  87. sprd_timer_clear_interrupt(timer_of_base(to));
  88. if (clockevent_state_oneshot(ce))
  89. sprd_timer_disable(timer_of_base(to));
  90. ce->event_handler(ce);
  91. return IRQ_HANDLED;
  92. }
  93. static struct timer_of to = {
  94. .flags = TIMER_OF_IRQ | TIMER_OF_BASE | TIMER_OF_CLOCK,
  95. .clkevt = {
  96. .name = TIMER_NAME,
  97. .rating = 300,
  98. .features = CLOCK_EVT_FEAT_DYNIRQ | CLOCK_EVT_FEAT_PERIODIC |
  99. CLOCK_EVT_FEAT_ONESHOT,
  100. .set_state_shutdown = sprd_timer_shutdown,
  101. .set_state_periodic = sprd_timer_set_periodic,
  102. .set_next_event = sprd_timer_set_next_event,
  103. .cpumask = cpu_possible_mask,
  104. },
  105. .of_irq = {
  106. .handler = sprd_timer_interrupt,
  107. .flags = IRQF_TIMER | IRQF_IRQPOLL,
  108. },
  109. };
  110. static int __init sprd_timer_init(struct device_node *np)
  111. {
  112. int ret;
  113. ret = timer_of_init(np, &to);
  114. if (ret)
  115. return ret;
  116. sprd_timer_enable_interrupt(timer_of_base(&to));
  117. clockevents_config_and_register(&to.clkevt, timer_of_rate(&to),
  118. 1, UINT_MAX);
  119. return 0;
  120. }
  121. static struct timer_of suspend_to = {
  122. .flags = TIMER_OF_BASE | TIMER_OF_CLOCK,
  123. };
  124. static u64 sprd_suspend_timer_read(struct clocksource *cs)
  125. {
  126. return ~(u64)readl_relaxed(timer_of_base(&suspend_to) +
  127. TIMER_VALUE_SHDW_LO) & cs->mask;
  128. }
  129. static int sprd_suspend_timer_enable(struct clocksource *cs)
  130. {
  131. sprd_timer_update_counter(timer_of_base(&suspend_to),
  132. TIMER_VALUE_LO_MASK);
  133. sprd_timer_enable(timer_of_base(&suspend_to), TIMER_CTL_PERIOD_MODE);
  134. return 0;
  135. }
  136. static void sprd_suspend_timer_disable(struct clocksource *cs)
  137. {
  138. sprd_timer_disable(timer_of_base(&suspend_to));
  139. }
  140. static struct clocksource suspend_clocksource = {
  141. .name = "sprd_suspend_timer",
  142. .rating = 200,
  143. .read = sprd_suspend_timer_read,
  144. .enable = sprd_suspend_timer_enable,
  145. .disable = sprd_suspend_timer_disable,
  146. .mask = CLOCKSOURCE_MASK(32),
  147. .flags = CLOCK_SOURCE_IS_CONTINUOUS | CLOCK_SOURCE_SUSPEND_NONSTOP,
  148. };
  149. static int __init sprd_suspend_timer_init(struct device_node *np)
  150. {
  151. int ret;
  152. ret = timer_of_init(np, &suspend_to);
  153. if (ret)
  154. return ret;
  155. clocksource_register_hz(&suspend_clocksource,
  156. timer_of_rate(&suspend_to));
  157. return 0;
  158. }
  159. TIMER_OF_DECLARE(sc9860_timer, "sprd,sc9860-timer", sprd_timer_init);
  160. TIMER_OF_DECLARE(sc9860_persistent_timer, "sprd,sc9860-suspend-timer",
  161. sprd_suspend_timer_init);