1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * RZ System controller driver
4 *
5 * Copyright (C) 2024 Renesas Electronics Corp.
6 */
7
8 #include <linux/bitfield.h>
9 #include <linux/cleanup.h>
10 #include <linux/io.h>
11 #include <linux/mfd/syscon.h>
12 #include <linux/of.h>
13 #include <linux/platform_device.h>
14 #include <linux/regmap.h>
15 #include <linux/slab.h>
16 #include <linux/sys_soc.h>
17
18 #include "rz-sysc.h"
19
20 /**
21 * struct rz_sysc - RZ SYSC private data structure
22 * @base: SYSC base address
23 * @dev: SYSC device pointer
24 */
25 struct rz_sysc {
26 void __iomem *base;
27 struct device *dev;
28 };
29
rz_sysc_soc_init(struct rz_sysc * sysc,const struct of_device_id * match)30 static int rz_sysc_soc_init(struct rz_sysc *sysc, const struct of_device_id *match)
31 {
32 const struct rz_sysc_init_data *sysc_data = match->data;
33 const struct rz_sysc_soc_id_init_data *soc_data = sysc_data->soc_id_init_data;
34 struct soc_device_attribute *soc_dev_attr;
35 const char *soc_id_start, *soc_id_end;
36 u32 val, revision, specific_id;
37 struct soc_device *soc_dev;
38 char soc_id[32] = {0};
39 size_t size;
40
41 soc_id_start = strchr(match->compatible, ',') + 1;
42 soc_id_end = strchr(match->compatible, '-');
43 size = soc_id_end - soc_id_start + 1;
44 if (size > 32)
45 size = sizeof(soc_id);
46 strscpy(soc_id, soc_id_start, size);
47
48 soc_dev_attr = devm_kzalloc(sysc->dev, sizeof(*soc_dev_attr), GFP_KERNEL);
49 if (!soc_dev_attr)
50 return -ENOMEM;
51
52 soc_dev_attr->family = devm_kstrdup(sysc->dev, soc_data->family, GFP_KERNEL);
53 if (!soc_dev_attr->family)
54 return -ENOMEM;
55
56 soc_dev_attr->soc_id = devm_kstrdup(sysc->dev, soc_id, GFP_KERNEL);
57 if (!soc_dev_attr->soc_id)
58 return -ENOMEM;
59
60 val = readl(sysc->base + soc_data->devid_offset);
61 revision = field_get(soc_data->revision_mask, val);
62 specific_id = field_get(soc_data->specific_id_mask, val);
63 soc_dev_attr->revision = devm_kasprintf(sysc->dev, GFP_KERNEL, "%u", revision);
64 if (!soc_dev_attr->revision)
65 return -ENOMEM;
66
67 if (soc_data->id && specific_id != soc_data->id) {
68 dev_warn(sysc->dev, "SoC mismatch (product = 0x%x)\n", specific_id);
69 return -ENODEV;
70 }
71
72 /* Try to call SoC-specific device identification */
73 if (soc_data->print_id) {
74 soc_data->print_id(sysc->dev, sysc->base, soc_dev_attr);
75 } else {
76 dev_info(sysc->dev, "Detected Renesas %s %s Rev %s\n",
77 soc_dev_attr->family, soc_dev_attr->soc_id, soc_dev_attr->revision);
78 }
79
80 soc_dev = soc_device_register(soc_dev_attr);
81 if (IS_ERR(soc_dev))
82 return PTR_ERR(soc_dev);
83
84 return 0;
85 }
86
87 static const struct of_device_id rz_sysc_match[] = {
88 #ifdef CONFIG_SYSC_R9A08G045
89 { .compatible = "renesas,r9a08g045-sysc", .data = &rzg3s_sysc_init_data },
90 #endif
91 #ifdef CONFIG_SYS_R9A09G047
92 { .compatible = "renesas,r9a09g047-sys", .data = &rzg3e_sys_init_data },
93 #endif
94 #ifdef CONFIG_SYS_R9A09G056
95 { .compatible = "renesas,r9a09g056-sys", .data = &rzv2n_sys_init_data },
96 #endif
97 #ifdef CONFIG_SYS_R9A09G057
98 { .compatible = "renesas,r9a09g057-sys", .data = &rzv2h_sys_init_data },
99 #endif
100 { }
101 };
102 MODULE_DEVICE_TABLE(of, rz_sysc_match);
103
rz_sysc_probe(struct platform_device * pdev)104 static int rz_sysc_probe(struct platform_device *pdev)
105 {
106 const struct rz_sysc_init_data *data;
107 const struct of_device_id *match;
108 struct device *dev = &pdev->dev;
109 struct regmap *regmap;
110 struct rz_sysc *sysc;
111 int ret;
112
113 struct regmap_config *regmap_cfg __free(kfree) = kzalloc(sizeof(*regmap_cfg), GFP_KERNEL);
114 if (!regmap_cfg)
115 return -ENOMEM;
116
117 match = of_match_node(rz_sysc_match, dev->of_node);
118 if (!match)
119 return -ENODEV;
120
121 data = match->data;
122
123 sysc = devm_kzalloc(dev, sizeof(*sysc), GFP_KERNEL);
124 if (!sysc)
125 return -ENOMEM;
126
127 sysc->base = devm_platform_ioremap_resource(pdev, 0);
128 if (IS_ERR(sysc->base))
129 return PTR_ERR(sysc->base);
130
131 sysc->dev = dev;
132 ret = rz_sysc_soc_init(sysc, match);
133 if (ret)
134 return ret;
135
136 regmap_cfg->name = "rz_sysc_regs";
137 regmap_cfg->reg_bits = 32;
138 regmap_cfg->reg_stride = 4;
139 regmap_cfg->val_bits = 32;
140 regmap_cfg->fast_io = true;
141 regmap_cfg->max_register = data->max_register;
142 regmap_cfg->readable_reg = data->readable_reg;
143 regmap_cfg->writeable_reg = data->writeable_reg;
144
145 regmap = devm_regmap_init_mmio(dev, sysc->base, regmap_cfg);
146 if (IS_ERR(regmap))
147 return PTR_ERR(regmap);
148
149 return of_syscon_register_regmap(dev->of_node, regmap);
150 }
151
152 static struct platform_driver rz_sysc_driver = {
153 .driver = {
154 .name = "renesas-rz-sysc",
155 .suppress_bind_attrs = true,
156 .of_match_table = rz_sysc_match
157 },
158 .probe = rz_sysc_probe
159 };
160
rz_sysc_init(void)161 static int __init rz_sysc_init(void)
162 {
163 return platform_driver_register(&rz_sysc_driver);
164 }
165 subsys_initcall(rz_sysc_init);
166
167 MODULE_DESCRIPTION("Renesas RZ System Controller Driver");
168 MODULE_AUTHOR("Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>");
169 MODULE_LICENSE("GPL");
170