1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2022 Microchip Technology, Inc. and its subsidiaries
4 */
5
6 #include <asm/arch/hardware.h>
7 #include <asm/io.h>
8 #include <asm/arch/at91_rstc.h>
9 #include <clk.h>
10 #include <common.h>
11 #include <cpu_func.h>
12 #include <dm.h>
13 #include <dm/device_compat.h>
14 #include <dm/device-internal.h>
15 #include <sysreset.h>
16
at91_sysreset_request(struct udevice * dev,enum sysreset_t type)17 static int at91_sysreset_request(struct udevice *dev, enum sysreset_t type)
18 {
19 at91_rstc_t *rstc = (at91_rstc_t *)dev_get_priv(dev);
20
21 writel(AT91_RSTC_KEY
22 | AT91_RSTC_CR_PROCRST /* Processor Reset */
23 | AT91_RSTC_CR_PERRST /* Peripheral Reset */
24 #ifdef CONFIG_AT91RESET_EXTRST
25 | AT91_RSTC_CR_EXTRST /* External Reset (assert nRST pin) */
26 #endif
27 , &rstc->cr);
28
29 return -EINPROGRESS;
30 }
31
at91_sysreset_probe(struct udevice * dev)32 static int at91_sysreset_probe(struct udevice *dev)
33 {
34 struct clk slck;
35 void *priv;
36 int ret;
37
38 priv = dev_remap_addr(dev);
39 if (!priv)
40 return -EINVAL;
41
42 dev_set_priv(dev, priv);
43
44 ret = clk_get_by_index(dev, 0, &slck);
45 if (ret)
46 return ret;
47
48 ret = clk_prepare_enable(&slck);
49 if (ret)
50 return ret;
51
52 return 0;
53 }
54
55 static struct sysreset_ops at91_sysreset = {
56 .request = at91_sysreset_request,
57 };
58
59 U_BOOT_DRIVER(sysreset_at91) = {
60 .id = UCLASS_SYSRESET,
61 .name = "at91_sysreset",
62 .ops = &at91_sysreset,
63 .probe = at91_sysreset_probe,
64 };
65