1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright 2017 CS Systemes d'Information
4  */
5 
6 #include <common.h>
7 #include <dm.h>
8 #include <wdt.h>
9 #include <mpc8xx.h>
10 #include <asm/cpm_8xx.h>
11 #include <asm/io.h>
12 
13 void hw_watchdog_reset(void)
14 {
15 	immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR;
16 
17 	out_be16(&immap->im_siu_conf.sc_swsr, 0x556c);	/* write magic1 */
18 	out_be16(&immap->im_siu_conf.sc_swsr, 0xaa39);	/* write magic2 */
19 }
20 
21 #ifdef CONFIG_WDT_MPC8xx
22 static int mpc8xx_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
23 {
24 	immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR;
25 
26 	out_be32(&immap->im_siu_conf.sc_sypcr, CONFIG_SYS_SYPCR);
27 
28 	if (!(in_be32(&immap->im_siu_conf.sc_sypcr) & SYPCR_SWE))
29 		return -EBUSY;
30 	return 0;
31 
32 }
33 
34 static int mpc8xx_wdt_stop(struct udevice *dev)
35 {
36 	immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR;
37 
38 	out_be32(&immap->im_siu_conf.sc_sypcr, CONFIG_SYS_SYPCR & ~SYPCR_SWE);
39 
40 	if (in_be32(&immap->im_siu_conf.sc_sypcr) & SYPCR_SWE)
41 		return -EBUSY;
42 	return 0;
43 }
44 
45 static int mpc8xx_wdt_reset(struct udevice *dev)
46 {
47 	hw_watchdog_reset();
48 
49 	return 0;
50 }
51 
52 static const struct wdt_ops mpc8xx_wdt_ops = {
53 	.start = mpc8xx_wdt_start,
54 	.reset = mpc8xx_wdt_reset,
55 	.stop = mpc8xx_wdt_stop,
56 };
57 
58 static const struct udevice_id mpc8xx_wdt_ids[] = {
59 	{ .compatible = "fsl,pq1-wdt" },
60 	{}
61 };
62 
63 U_BOOT_DRIVER(wdt_mpc8xx) = {
64 	.name = "wdt_mpc8xx",
65 	.id = UCLASS_WDT,
66 	.of_match = mpc8xx_wdt_ids,
67 	.ops = &mpc8xx_wdt_ops,
68 };
69 #endif /* CONFIG_WDT_MPC8xx */
70