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/io.h> 9 #include <linux/of.h> 10 #include <linux/platform_device.h> 11 #include <linux/sys_soc.h> 12 13 #include "rz-sysc.h" 14 15 #define field_get(_mask, _reg) (((_reg) & (_mask)) >> (ffs(_mask) - 1)) 16 17 /** 18 * struct rz_sysc - RZ SYSC private data structure 19 * @base: SYSC base address 20 * @dev: SYSC device pointer 21 */ 22 struct rz_sysc { 23 void __iomem *base; 24 struct device *dev; 25 }; 26 27 static int rz_sysc_soc_init(struct rz_sysc *sysc, const struct of_device_id *match) 28 { 29 const struct rz_sysc_init_data *sysc_data = match->data; 30 const struct rz_sysc_soc_id_init_data *soc_data = sysc_data->soc_id_init_data; 31 struct soc_device_attribute *soc_dev_attr; 32 const char *soc_id_start, *soc_id_end; 33 u32 val, revision, specific_id; 34 struct soc_device *soc_dev; 35 char soc_id[32] = {0}; 36 size_t size; 37 38 soc_id_start = strchr(match->compatible, ',') + 1; 39 soc_id_end = strchr(match->compatible, '-'); 40 size = soc_id_end - soc_id_start + 1; 41 if (size > 32) 42 size = sizeof(soc_id); 43 strscpy(soc_id, soc_id_start, size); 44 45 soc_dev_attr = devm_kzalloc(sysc->dev, sizeof(*soc_dev_attr), GFP_KERNEL); 46 if (!soc_dev_attr) 47 return -ENOMEM; 48 49 soc_dev_attr->family = devm_kstrdup(sysc->dev, soc_data->family, GFP_KERNEL); 50 if (!soc_dev_attr->family) 51 return -ENOMEM; 52 53 soc_dev_attr->soc_id = devm_kstrdup(sysc->dev, soc_id, GFP_KERNEL); 54 if (!soc_dev_attr->soc_id) 55 return -ENOMEM; 56 57 val = readl(sysc->base + soc_data->devid_offset); 58 revision = field_get(soc_data->revision_mask, val); 59 specific_id = field_get(soc_data->specific_id_mask, val); 60 soc_dev_attr->revision = devm_kasprintf(sysc->dev, GFP_KERNEL, "%u", revision); 61 if (!soc_dev_attr->revision) 62 return -ENOMEM; 63 64 if (soc_data->id && specific_id != soc_data->id) { 65 dev_warn(sysc->dev, "SoC mismatch (product = 0x%x)\n", specific_id); 66 return -ENODEV; 67 } 68 69 /* Try to call SoC-specific device identification */ 70 if (soc_data->print_id) { 71 soc_data->print_id(sysc->dev, sysc->base, soc_dev_attr); 72 } else { 73 dev_info(sysc->dev, "Detected Renesas %s %s Rev %s\n", 74 soc_dev_attr->family, soc_dev_attr->soc_id, soc_dev_attr->revision); 75 } 76 77 soc_dev = soc_device_register(soc_dev_attr); 78 if (IS_ERR(soc_dev)) 79 return PTR_ERR(soc_dev); 80 81 return 0; 82 } 83 84 static const struct of_device_id rz_sysc_match[] = { 85 #ifdef CONFIG_SYSC_R9A08G045 86 { .compatible = "renesas,r9a08g045-sysc", .data = &rzg3s_sysc_init_data }, 87 #endif 88 #ifdef CONFIG_SYS_R9A09G047 89 { .compatible = "renesas,r9a09g047-sys", .data = &rzg3e_sys_init_data }, 90 #endif 91 #ifdef CONFIG_SYS_R9A09G057 92 { .compatible = "renesas,r9a09g057-sys", .data = &rzv2h_sys_init_data }, 93 #endif 94 { } 95 }; 96 MODULE_DEVICE_TABLE(of, rz_sysc_match); 97 98 static int rz_sysc_probe(struct platform_device *pdev) 99 { 100 const struct of_device_id *match; 101 struct device *dev = &pdev->dev; 102 struct rz_sysc *sysc; 103 104 match = of_match_node(rz_sysc_match, dev->of_node); 105 if (!match) 106 return -ENODEV; 107 108 sysc = devm_kzalloc(dev, sizeof(*sysc), GFP_KERNEL); 109 if (!sysc) 110 return -ENOMEM; 111 112 sysc->base = devm_platform_ioremap_resource(pdev, 0); 113 if (IS_ERR(sysc->base)) 114 return PTR_ERR(sysc->base); 115 116 sysc->dev = dev; 117 return rz_sysc_soc_init(sysc, match); 118 } 119 120 static struct platform_driver rz_sysc_driver = { 121 .driver = { 122 .name = "renesas-rz-sysc", 123 .suppress_bind_attrs = true, 124 .of_match_table = rz_sysc_match 125 }, 126 .probe = rz_sysc_probe 127 }; 128 129 static int __init rz_sysc_init(void) 130 { 131 return platform_driver_register(&rz_sysc_driver); 132 } 133 subsys_initcall(rz_sysc_init); 134 135 MODULE_DESCRIPTION("Renesas RZ System Controller Driver"); 136 MODULE_AUTHOR("Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>"); 137 MODULE_LICENSE("GPL"); 138