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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * R-Car Gen1 RESET/WDT, R-Car Gen2, Gen3, and RZ/G RST Driver
4 *
5 * Copyright (C) 2016 Glider bvba
6 */
7
8#include <linux/err.h>
9#include <linux/io.h>
10#include <linux/of_address.h>
11#include <linux/soc/renesas/rcar-rst.h>
12
13#define WDTRSTCR_RESET 0xA55A0002
14#define WDTRSTCR 0x0054
15
16static int rcar_rst_enable_wdt_reset(void __iomem *base)
17{
18 iowrite32(WDTRSTCR_RESET, base + WDTRSTCR);
19 return 0;
20}
21
22struct rst_config {
23 unsigned int modemr; /* Mode Monitoring Register Offset */
24 int (*configure)(void __iomem *base); /* Platform specific config */
25};
26
27static const struct rst_config rcar_rst_gen1 __initconst = {
28 .modemr = 0x20,
29};
30
31static const struct rst_config rcar_rst_gen2 __initconst = {
32 .modemr = 0x60,
33 .configure = rcar_rst_enable_wdt_reset,
34};
35
36static const struct rst_config rcar_rst_gen3 __initconst = {
37 .modemr = 0x60,
38};
39
40static const struct of_device_id rcar_rst_matches[] __initconst = {
41 /* RZ/G1 is handled like R-Car Gen2 */
42 { .compatible = "renesas,r8a7742-rst", .data = &rcar_rst_gen2 },
43 { .compatible = "renesas,r8a7743-rst", .data = &rcar_rst_gen2 },
44 { .compatible = "renesas,r8a7744-rst", .data = &rcar_rst_gen2 },
45 { .compatible = "renesas,r8a7745-rst", .data = &rcar_rst_gen2 },
46 { .compatible = "renesas,r8a77470-rst", .data = &rcar_rst_gen2 },
47 /* RZ/G2 is handled like R-Car Gen3 */
48 { .compatible = "renesas,r8a774a1-rst", .data = &rcar_rst_gen3 },
49 { .compatible = "renesas,r8a774b1-rst", .data = &rcar_rst_gen3 },
50 { .compatible = "renesas,r8a774c0-rst", .data = &rcar_rst_gen3 },
51 { .compatible = "renesas,r8a774e1-rst", .data = &rcar_rst_gen3 },
52 /* R-Car Gen1 */
53 { .compatible = "renesas,r8a7778-reset-wdt", .data = &rcar_rst_gen1 },
54 { .compatible = "renesas,r8a7779-reset-wdt", .data = &rcar_rst_gen1 },
55 /* R-Car Gen2 */
56 { .compatible = "renesas,r8a7790-rst", .data = &rcar_rst_gen2 },
57 { .compatible = "renesas,r8a7791-rst", .data = &rcar_rst_gen2 },
58 { .compatible = "renesas,r8a7792-rst", .data = &rcar_rst_gen2 },
59 { .compatible = "renesas,r8a7793-rst", .data = &rcar_rst_gen2 },
60 { .compatible = "renesas,r8a7794-rst", .data = &rcar_rst_gen2 },
61 /* R-Car Gen3 */
62 { .compatible = "renesas,r8a7795-rst", .data = &rcar_rst_gen3 },
63 { .compatible = "renesas,r8a7796-rst", .data = &rcar_rst_gen3 },
64 { .compatible = "renesas,r8a77961-rst", .data = &rcar_rst_gen3 },
65 { .compatible = "renesas,r8a77965-rst", .data = &rcar_rst_gen3 },
66 { .compatible = "renesas,r8a77970-rst", .data = &rcar_rst_gen3 },
67 { .compatible = "renesas,r8a77980-rst", .data = &rcar_rst_gen3 },
68 { .compatible = "renesas,r8a77990-rst", .data = &rcar_rst_gen3 },
69 { .compatible = "renesas,r8a77995-rst", .data = &rcar_rst_gen3 },
70 { /* sentinel */ }
71};
72
73static void __iomem *rcar_rst_base __initdata;
74static u32 saved_mode __initdata;
75
76static int __init rcar_rst_init(void)
77{
78 const struct of_device_id *match;
79 const struct rst_config *cfg;
80 struct device_node *np;
81 void __iomem *base;
82 int error = 0;
83
84 np = of_find_matching_node_and_match(NULL, rcar_rst_matches, &match);
85 if (!np)
86 return -ENODEV;
87
88 base = of_iomap(np, 0);
89 if (!base) {
90 pr_warn("%pOF: Cannot map regs\n", np);
91 error = -ENOMEM;
92 goto out_put;
93 }
94
95 rcar_rst_base = base;
96 cfg = match->data;
97 saved_mode = ioread32(base + cfg->modemr);
98 if (cfg->configure) {
99 error = cfg->configure(base);
100 if (error) {
101 pr_warn("%pOF: Cannot run SoC specific configuration\n",
102 np);
103 goto out_put;
104 }
105 }
106
107 pr_debug("%pOF: MODE = 0x%08x\n", np, saved_mode);
108
109out_put:
110 of_node_put(np);
111 return error;
112}
113
114int __init rcar_rst_read_mode_pins(u32 *mode)
115{
116 int error;
117
118 if (!rcar_rst_base) {
119 error = rcar_rst_init();
120 if (error)
121 return error;
122 }
123
124 *mode = saved_mode;
125 return 0;
126}
1/*
2 * R-Car Gen1 RESET/WDT, R-Car Gen2, Gen3, and RZ/G RST Driver
3 *
4 * Copyright (C) 2016 Glider bvba
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
8 * for more details.
9 */
10
11#include <linux/err.h>
12#include <linux/io.h>
13#include <linux/of_address.h>
14#include <linux/soc/renesas/rcar-rst.h>
15
16struct rst_config {
17 unsigned int modemr; /* Mode Monitoring Register Offset */
18};
19
20static const struct rst_config rcar_rst_gen1 __initconst = {
21 .modemr = 0x20,
22};
23
24static const struct rst_config rcar_rst_gen2 __initconst = {
25 .modemr = 0x60,
26};
27
28static const struct of_device_id rcar_rst_matches[] __initconst = {
29 /* RZ/G is handled like R-Car Gen2 */
30 { .compatible = "renesas,r8a7743-rst", .data = &rcar_rst_gen2 },
31 { .compatible = "renesas,r8a7745-rst", .data = &rcar_rst_gen2 },
32 /* R-Car Gen1 */
33 { .compatible = "renesas,r8a7778-reset-wdt", .data = &rcar_rst_gen1 },
34 { .compatible = "renesas,r8a7779-reset-wdt", .data = &rcar_rst_gen1 },
35 /* R-Car Gen2 */
36 { .compatible = "renesas,r8a7790-rst", .data = &rcar_rst_gen2 },
37 { .compatible = "renesas,r8a7791-rst", .data = &rcar_rst_gen2 },
38 { .compatible = "renesas,r8a7792-rst", .data = &rcar_rst_gen2 },
39 { .compatible = "renesas,r8a7793-rst", .data = &rcar_rst_gen2 },
40 { .compatible = "renesas,r8a7794-rst", .data = &rcar_rst_gen2 },
41 /* R-Car Gen3 is handled like R-Car Gen2 */
42 { .compatible = "renesas,r8a7795-rst", .data = &rcar_rst_gen2 },
43 { .compatible = "renesas,r8a7796-rst", .data = &rcar_rst_gen2 },
44 { /* sentinel */ }
45};
46
47static void __iomem *rcar_rst_base __initdata;
48static u32 saved_mode __initdata;
49
50static int __init rcar_rst_init(void)
51{
52 const struct of_device_id *match;
53 const struct rst_config *cfg;
54 struct device_node *np;
55 void __iomem *base;
56 int error = 0;
57
58 np = of_find_matching_node_and_match(NULL, rcar_rst_matches, &match);
59 if (!np)
60 return -ENODEV;
61
62 base = of_iomap(np, 0);
63 if (!base) {
64 pr_warn("%s: Cannot map regs\n", np->full_name);
65 error = -ENOMEM;
66 goto out_put;
67 }
68
69 rcar_rst_base = base;
70 cfg = match->data;
71 saved_mode = ioread32(base + cfg->modemr);
72
73 pr_debug("%s: MODE = 0x%08x\n", np->full_name, saved_mode);
74
75out_put:
76 of_node_put(np);
77 return error;
78}
79
80int __init rcar_rst_read_mode_pins(u32 *mode)
81{
82 int error;
83
84 if (!rcar_rst_base) {
85 error = rcar_rst_init();
86 if (error)
87 return error;
88 }
89
90 *mode = saved_mode;
91 return 0;
92}