Eric Lee / smarc-uboot

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drivers/watchdog/mpc8xx_wdt.c 1.41 KB
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83d290c56   Tom Rini   SPDX: Convert all... 
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  // SPDX-License-Identifier: GPL-2.0+
c0bc2a7e0   Christophe Leroy   powerpc: mpc8xx: ... 
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  /*
   * Copyright 2017 CS Systemes d'Information
c0bc2a7e0   Christophe Leroy   powerpc: mpc8xx: ... 
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   */
  
  #include <common.h>
749c9aae9   Christophe Leroy   drivers: watchdog... 
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  #include <dm.h>
  #include <wdt.h>
c0bc2a7e0   Christophe Leroy   powerpc: mpc8xx: ... 
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  #include <mpc8xx.h>
  #include <asm/cpm_8xx.h>
  #include <asm/io.h>
a68256074   Christophe Leroy   watchdog: mpc8xx:... 
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  void hw_watchdog_reset(void)
c0bc2a7e0   Christophe Leroy   powerpc: mpc8xx: ... 
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  {
  	immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR;
  
  	out_be16(&immap->im_siu_conf.sc_swsr, 0x556c);	/* write magic1 */
  	out_be16(&immap->im_siu_conf.sc_swsr, 0xaa39);	/* write magic2 */
  }
749c9aae9   Christophe Leroy   drivers: watchdog... 
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  static int mpc8xx_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
  {
  	immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR;
  
  	out_be32(&immap->im_siu_conf.sc_sypcr, CONFIG_SYS_SYPCR);
  
  	if (!(in_be32(&immap->im_siu_conf.sc_sypcr) & SYPCR_SWE))
  		return -EBUSY;
  	return 0;
  
  }
  
  static int mpc8xx_wdt_stop(struct udevice *dev)
  {
  	immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR;
  
  	out_be32(&immap->im_siu_conf.sc_sypcr, CONFIG_SYS_SYPCR & ~SYPCR_SWE);
  
  	if (in_be32(&immap->im_siu_conf.sc_sypcr) & SYPCR_SWE)
  		return -EBUSY;
  	return 0;
  }
  
  static int mpc8xx_wdt_reset(struct udevice *dev)
  {
  	hw_watchdog_reset();
  
  	return 0;
  }
  
  static const struct wdt_ops mpc8xx_wdt_ops = {
  	.start = mpc8xx_wdt_start,
  	.reset = mpc8xx_wdt_reset,
  	.stop = mpc8xx_wdt_stop,
  };
  
  static const struct udevice_id mpc8xx_wdt_ids[] = {
  	{ .compatible = "fsl,pq1-wdt" },
  	{}
  };
  
  U_BOOT_DRIVER(wdt_mpc8xx) = {
  	.name = "wdt_mpc8xx",
  	.id = UCLASS_WDT,
  	.of_match = mpc8xx_wdt_ids,
  	.ops = &mpc8xx_wdt_ops,
  };