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192.168.1.100 / T800 / 15d4438f3c457b15d5b7f076bba313638bae4402 / . / src / kernel / linux / v4.19 / drivers / soc / renesas / rcar-rst.c
blob: d9c1034e70e94d05d4557d98535aeac873aa51a4 [file] [log] [blame]
xjb04a4022021-11-25 15:01:52 +0800[diff] [blame]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
16#define WDTRSTCR_RESET 0xA55A0002
17#define WDTRSTCR 0x0054
18
19static int rcar_rst_enable_wdt_reset(void __iomem *base)
20{
21 iowrite32(WDTRSTCR_RESET, base + WDTRSTCR);
22 return 0;
23}
24
25struct rst_config {
26 unsigned int modemr; /* Mode Monitoring Register Offset */
27 int (*configure)(void *base); /* Platform specific configuration */
28};
29
30static const struct rst_config rcar_rst_gen1 __initconst = {
31 .modemr = 0x20,
32};
33
34static const struct rst_config rcar_rst_gen2 __initconst = {
35 .modemr = 0x60,
36 .configure = rcar_rst_enable_wdt_reset,
37};
38
39static const struct rst_config rcar_rst_gen3 __initconst = {
40 .modemr = 0x60,
41};
42
43static const struct of_device_id rcar_rst_matches[] __initconst = {
44 /* RZ/G is handled like R-Car Gen2 */
45 { .compatible = "renesas,r8a7743-rst", .data = &rcar_rst_gen2 },
46 { .compatible = "renesas,r8a7745-rst", .data = &rcar_rst_gen2 },
47 { .compatible = "renesas,r8a77470-rst", .data = &rcar_rst_gen2 },
48 /* R-Car Gen1 */
49 { .compatible = "renesas,r8a7778-reset-wdt", .data = &rcar_rst_gen1 },
50 { .compatible = "renesas,r8a7779-reset-wdt", .data = &rcar_rst_gen1 },
51 /* R-Car Gen2 */
52 { .compatible = "renesas,r8a7790-rst", .data = &rcar_rst_gen2 },
53 { .compatible = "renesas,r8a7791-rst", .data = &rcar_rst_gen2 },
54 { .compatible = "renesas,r8a7792-rst", .data = &rcar_rst_gen2 },
55 { .compatible = "renesas,r8a7793-rst", .data = &rcar_rst_gen2 },
56 { .compatible = "renesas,r8a7794-rst", .data = &rcar_rst_gen2 },
57 /* R-Car Gen3 */
58 { .compatible = "renesas,r8a7795-rst", .data = &rcar_rst_gen3 },
59 { .compatible = "renesas,r8a7796-rst", .data = &rcar_rst_gen3 },
60 { .compatible = "renesas,r8a77965-rst", .data = &rcar_rst_gen3 },
61 { .compatible = "renesas,r8a77970-rst", .data = &rcar_rst_gen3 },
62 { .compatible = "renesas,r8a77980-rst", .data = &rcar_rst_gen3 },
63 { .compatible = "renesas,r8a77990-rst", .data = &rcar_rst_gen3 },
64 { .compatible = "renesas,r8a77995-rst", .data = &rcar_rst_gen3 },
65 { /* sentinel */ }
66};
67
68static void __iomem *rcar_rst_base __initdata;
69static u32 saved_mode __initdata;
70
71static int __init rcar_rst_init(void)
72{
73 const struct of_device_id *match;
74 const struct rst_config *cfg;
75 struct device_node *np;
76 void __iomem *base;
77 int error = 0;
78
79 np = of_find_matching_node_and_match(NULL, rcar_rst_matches, &match);
80 if (!np)
81 return -ENODEV;
82
83 base = of_iomap(np, 0);
84 if (!base) {
85 pr_warn("%pOF: Cannot map regs\n", np);
86 error = -ENOMEM;
87 goto out_put;
88 }
89
90 rcar_rst_base = base;
91 cfg = match->data;
92 saved_mode = ioread32(base + cfg->modemr);
93 if (cfg->configure) {
94 error = cfg->configure(base);
95 if (error) {
96 pr_warn("%pOF: Cannot run SoC specific configuration\n",
97 np);
98 goto out_put;
99 }
100 }
101
102 pr_debug("%pOF: MODE = 0x%08x\n", np, saved_mode);
103
104out_put:
105 of_node_put(np);
106 return error;
107}
108
109int __init rcar_rst_read_mode_pins(u32 *mode)
110{
111 int error;
112
113 if (!rcar_rst_base) {
114 error = rcar_rst_init();
115 if (error)
116 return error;
117 }
118
119 *mode = saved_mode;
120 return 0;
121}