Eric Lee / smarc-uboot

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drivers/timer/sti-timer.c 1.72 KB
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d41ce506b   Eric Lee   Initial Release, ... 
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  /*
   * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
   * Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  #include <common.h>
  #include <dm.h>
  #include <fdtdec.h>
  #include <timer.h>
  
  #include <asm/io.h>
  #include <asm/arch-armv7/globaltimer.h>
  
  DECLARE_GLOBAL_DATA_PTR;
  
  struct sti_timer_priv {
  	struct globaltimer *global_timer;
  };
  
  static int sti_timer_get_count(struct udevice *dev, u64 *count)
  {
  	struct sti_timer_priv *priv = dev_get_priv(dev);
  	struct globaltimer *global_timer = priv->global_timer;
  	u32 low, high;
  	u64 timer;
  	u32 old = readl(&global_timer->cnt_h);
  
  	while (1) {
  		low = readl(&global_timer->cnt_l);
  		high = readl(&global_timer->cnt_h);
  		if (old == high)
  			break;
  		else
  			old = high;
  	}
  	timer = high;
  	*count = (u64)((timer << 32) | low);
  
  	return 0;
  }
  
  static int sti_timer_probe(struct udevice *dev)
  {
  	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
  	struct sti_timer_priv *priv = dev_get_priv(dev);
  	fdt_addr_t addr;
  
  	uc_priv->clock_rate = CONFIG_SYS_HZ_CLOCK;
  
  	/* get arm global timer base address */
  	addr = fdtdec_get_addr(gd->fdt_blob, dev_of_offset(dev), "reg");
  	priv->global_timer = (struct globaltimer *)addr;
  
  	/* init timer */
  	writel(0x01, &priv->global_timer->ctl);
  
  	return 0;
  }
  
  static const struct timer_ops sti_timer_ops = {
  	.get_count = sti_timer_get_count,
  };
  
  static const struct udevice_id sti_timer_ids[] = {
  	{ .compatible = "arm,cortex-a9-global-timer" },
  	{}
  };
  
  U_BOOT_DRIVER(sti_timer) = {
  	.name = "sti_timer",
  	.id = UCLASS_TIMER,
  	.of_match = sti_timer_ids,
  	.priv_auto_alloc_size = sizeof(struct sti_timer_priv),
  	.probe = sti_timer_probe,
  	.ops = &sti_timer_ops,
  	.flags = DM_FLAG_PRE_RELOC,
  };