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
hw_watchdog_reset(void)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
mpc8xx_wdt_start(struct udevice * dev,u64 timeout,ulong flags)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
mpc8xx_wdt_stop(struct udevice * dev)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
mpc8xx_wdt_reset(struct udevice * dev)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