Eric Lee / smarc-uboot

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drivers/timer/ostm_timer.c 1.8 KB
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4d0732bf3   Marek Vasut   timer: renesas: A... 
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  // SPDX-License-Identifier: GPL-2.0+
  /*
   * Renesas RZ/A1 R7S72100 OSTM Timer driver
   *
   * Copyright (C) 2019 Marek Vasut <marek.vasut@gmail.com>
   */
  
  #include <common.h>
336d4615f   Simon Glass   dm: core: Create ... 
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  #include <malloc.h>
4d0732bf3   Marek Vasut   timer: renesas: A... 
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  #include <asm/io.h>
  #include <dm.h>
  #include <clk.h>
  #include <timer.h>
  
  #define OSTM_CMP	0x00
  #define OSTM_CNT	0x04
  #define OSTM_TE		0x10
  #define OSTM_TS		0x14
  #define OSTM_TT		0x18
  #define OSTM_CTL	0x20
  #define OSTM_CTL_D	BIT(1)
  
  DECLARE_GLOBAL_DATA_PTR;
  
  struct ostm_priv {
  	fdt_addr_t	regs;
  };
  
  static int ostm_get_count(struct udevice *dev, u64 *count)
  {
  	struct ostm_priv *priv = dev_get_priv(dev);
  
  	*count = timer_conv_64(readl(priv->regs + OSTM_CNT));
  
  	return 0;
  }
  
  static int ostm_probe(struct udevice *dev)
  {
  	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
  	struct ostm_priv *priv = dev_get_priv(dev);
  #if CONFIG_IS_ENABLED(CLK)
  	struct clk clk;
  	int ret;
  
  	ret = clk_get_by_index(dev, 0, &clk);
  	if (ret)
  		return ret;
  
  	uc_priv->clock_rate = clk_get_rate(&clk);
  
  	clk_free(&clk);
  #else
  	uc_priv->clock_rate = CONFIG_SYS_CLK_FREQ / 2;
  #endif
  
  	readb(priv->regs + OSTM_CTL);
  	writeb(OSTM_CTL_D, priv->regs + OSTM_CTL);
  
  	setbits_8(priv->regs + OSTM_TT, BIT(0));
  	writel(0xffffffff, priv->regs + OSTM_CMP);
  	setbits_8(priv->regs + OSTM_TS, BIT(0));
  
  	return 0;
  }
  
  static int ostm_ofdata_to_platdata(struct udevice *dev)
  {
  	struct ostm_priv *priv = dev_get_priv(dev);
  
  	priv->regs = dev_read_addr(dev);
  
  	return 0;
  }
  
  static const struct timer_ops ostm_ops = {
  	.get_count	= ostm_get_count,
  };
  
  static const struct udevice_id ostm_ids[] = {
  	{ .compatible = "renesas,ostm" },
  	{}
  };
  
  U_BOOT_DRIVER(ostm_timer) = {
  	.name		= "ostm-timer",
  	.id		= UCLASS_TIMER,
  	.ops		= &ostm_ops,
  	.probe		= ostm_probe,
  	.of_match	= ostm_ids,
  	.ofdata_to_platdata = ostm_ofdata_to_platdata,
  	.priv_auto_alloc_size = sizeof(struct ostm_priv),
  };