1 /* 2 * Copyright (C) 2015 Atmel 3 * 4 * Alexandre Belloni <alexandre.belloni@free-electrons.com 5 * Boris Brezillon <boris.brezillon@free-electrons.com 6 * 7 * This file is licensed under the terms of the GNU General Public 8 * License version 2. This program is licensed "as is" without any 9 * warranty of any kind, whether express or implied. 10 * 11 */ 12 13 #define pr_fmt(fmt) "AT91: " fmt 14 15 #include <linux/io.h> 16 #include <linux/of.h> 17 #include <linux/of_address.h> 18 #include <linux/of_platform.h> 19 #include <linux/slab.h> 20 #include <linux/sys_soc.h> 21 22 #include "soc.h" 23 24 #define AT91_DBGU_CIDR 0x40 25 #define AT91_DBGU_EXID 0x44 26 #define AT91_CHIPID_CIDR 0x00 27 #define AT91_CHIPID_EXID 0x04 28 #define AT91_CIDR_VERSION(x) ((x) & 0x1f) 29 #define AT91_CIDR_EXT BIT(31) 30 #define AT91_CIDR_MATCH_MASK 0x7fffffe0 31 32 static const struct at91_soc __initconst socs[] = { 33 #ifdef CONFIG_SOC_AT91RM9200 34 AT91_SOC(AT91RM9200_CIDR_MATCH, 0, "at91rm9200 BGA", "at91rm9200"), 35 #endif 36 #ifdef CONFIG_SOC_AT91SAM9 37 AT91_SOC(AT91SAM9260_CIDR_MATCH, 0, "at91sam9260", NULL), 38 AT91_SOC(AT91SAM9261_CIDR_MATCH, 0, "at91sam9261", NULL), 39 AT91_SOC(AT91SAM9263_CIDR_MATCH, 0, "at91sam9263", NULL), 40 AT91_SOC(AT91SAM9G20_CIDR_MATCH, 0, "at91sam9g20", NULL), 41 AT91_SOC(AT91SAM9RL64_CIDR_MATCH, 0, "at91sam9rl64", NULL), 42 AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9M11_EXID_MATCH, 43 "at91sam9m11", "at91sam9g45"), 44 AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9M10_EXID_MATCH, 45 "at91sam9m10", "at91sam9g45"), 46 AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9G46_EXID_MATCH, 47 "at91sam9g46", "at91sam9g45"), 48 AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9G45_EXID_MATCH, 49 "at91sam9g45", "at91sam9g45"), 50 AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9G15_EXID_MATCH, 51 "at91sam9g15", "at91sam9x5"), 52 AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9G35_EXID_MATCH, 53 "at91sam9g35", "at91sam9x5"), 54 AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9X35_EXID_MATCH, 55 "at91sam9x35", "at91sam9x5"), 56 AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9G25_EXID_MATCH, 57 "at91sam9g25", "at91sam9x5"), 58 AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9X25_EXID_MATCH, 59 "at91sam9x25", "at91sam9x5"), 60 AT91_SOC(AT91SAM9N12_CIDR_MATCH, AT91SAM9CN12_EXID_MATCH, 61 "at91sam9cn12", "at91sam9n12"), 62 AT91_SOC(AT91SAM9N12_CIDR_MATCH, AT91SAM9N12_EXID_MATCH, 63 "at91sam9n12", "at91sam9n12"), 64 AT91_SOC(AT91SAM9N12_CIDR_MATCH, AT91SAM9CN11_EXID_MATCH, 65 "at91sam9cn11", "at91sam9n12"), 66 AT91_SOC(AT91SAM9XE128_CIDR_MATCH, 0, "at91sam9xe128", "at91sam9xe128"), 67 AT91_SOC(AT91SAM9XE256_CIDR_MATCH, 0, "at91sam9xe256", "at91sam9xe256"), 68 AT91_SOC(AT91SAM9XE512_CIDR_MATCH, 0, "at91sam9xe512", "at91sam9xe512"), 69 #endif 70 #ifdef CONFIG_SOC_SAMA5 71 AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D21CU_EXID_MATCH, 72 "sama5d21", "sama5d2"), 73 AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D22CU_EXID_MATCH, 74 "sama5d22", "sama5d2"), 75 AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D23CU_EXID_MATCH, 76 "sama5d23", "sama5d2"), 77 AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D24CX_EXID_MATCH, 78 "sama5d24", "sama5d2"), 79 AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D24CU_EXID_MATCH, 80 "sama5d24", "sama5d2"), 81 AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D26CU_EXID_MATCH, 82 "sama5d26", "sama5d2"), 83 AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D27CU_EXID_MATCH, 84 "sama5d27", "sama5d2"), 85 AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D27CN_EXID_MATCH, 86 "sama5d27", "sama5d2"), 87 AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D28CU_EXID_MATCH, 88 "sama5d28", "sama5d2"), 89 AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D28CN_EXID_MATCH, 90 "sama5d28", "sama5d2"), 91 AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D31_EXID_MATCH, 92 "sama5d31", "sama5d3"), 93 AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D33_EXID_MATCH, 94 "sama5d33", "sama5d3"), 95 AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D34_EXID_MATCH, 96 "sama5d34", "sama5d3"), 97 AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D35_EXID_MATCH, 98 "sama5d35", "sama5d3"), 99 AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D36_EXID_MATCH, 100 "sama5d36", "sama5d3"), 101 AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D41_EXID_MATCH, 102 "sama5d41", "sama5d4"), 103 AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D42_EXID_MATCH, 104 "sama5d42", "sama5d4"), 105 AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D43_EXID_MATCH, 106 "sama5d43", "sama5d4"), 107 AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D44_EXID_MATCH, 108 "sama5d44", "sama5d4"), 109 #endif 110 { /* sentinel */ }, 111 }; 112 113 static int __init at91_get_cidr_exid_from_dbgu(u32 *cidr, u32 *exid) 114 { 115 struct device_node *np; 116 void __iomem *regs; 117 118 np = of_find_compatible_node(NULL, NULL, "atmel,at91rm9200-dbgu"); 119 if (!np) 120 np = of_find_compatible_node(NULL, NULL, 121 "atmel,at91sam9260-dbgu"); 122 if (!np) 123 return -ENODEV; 124 125 regs = of_iomap(np, 0); 126 of_node_put(np); 127 128 if (!regs) { 129 pr_warn("Could not map DBGU iomem range"); 130 return -ENXIO; 131 } 132 133 *cidr = readl(regs + AT91_DBGU_CIDR); 134 *exid = readl(regs + AT91_DBGU_EXID); 135 136 iounmap(regs); 137 138 return 0; 139 } 140 141 static int __init at91_get_cidr_exid_from_chipid(u32 *cidr, u32 *exid) 142 { 143 struct device_node *np; 144 void __iomem *regs; 145 146 np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-chipid"); 147 if (!np) 148 return -ENODEV; 149 150 regs = of_iomap(np, 0); 151 of_node_put(np); 152 153 if (!regs) { 154 pr_warn("Could not map DBGU iomem range"); 155 return -ENXIO; 156 } 157 158 *cidr = readl(regs + AT91_CHIPID_CIDR); 159 *exid = readl(regs + AT91_CHIPID_EXID); 160 161 iounmap(regs); 162 163 return 0; 164 } 165 166 struct soc_device * __init at91_soc_init(const struct at91_soc *socs) 167 { 168 struct soc_device_attribute *soc_dev_attr; 169 const struct at91_soc *soc; 170 struct soc_device *soc_dev; 171 u32 cidr, exid; 172 int ret; 173 174 /* 175 * With SAMA5D2 and later SoCs, CIDR and EXID registers are no more 176 * in the dbgu device but in the chipid device whose purpose is only 177 * to expose these two registers. 178 */ 179 ret = at91_get_cidr_exid_from_dbgu(&cidr, &exid); 180 if (ret) 181 ret = at91_get_cidr_exid_from_chipid(&cidr, &exid); 182 if (ret) { 183 if (ret == -ENODEV) 184 pr_warn("Could not find identification node"); 185 return NULL; 186 } 187 188 for (soc = socs; soc->name; soc++) { 189 if (soc->cidr_match != (cidr & AT91_CIDR_MATCH_MASK)) 190 continue; 191 192 if (!(cidr & AT91_CIDR_EXT) || soc->exid_match == exid) 193 break; 194 } 195 196 if (!soc->name) { 197 pr_warn("Could not find matching SoC description\n"); 198 return NULL; 199 } 200 201 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); 202 if (!soc_dev_attr) 203 return NULL; 204 205 soc_dev_attr->family = soc->family; 206 soc_dev_attr->soc_id = soc->name; 207 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%X", 208 AT91_CIDR_VERSION(cidr)); 209 soc_dev = soc_device_register(soc_dev_attr); 210 if (IS_ERR(soc_dev)) { 211 kfree(soc_dev_attr->revision); 212 kfree(soc_dev_attr); 213 pr_warn("Could not register SoC device\n"); 214 return NULL; 215 } 216 217 if (soc->family) 218 pr_info("Detected SoC family: %s\n", soc->family); 219 pr_info("Detected SoC: %s, revision %X\n", soc->name, 220 AT91_CIDR_VERSION(cidr)); 221 222 return soc_dev; 223 } 224 225 static int __init atmel_soc_device_init(void) 226 { 227 at91_soc_init(socs); 228 229 return 0; 230 } 231 subsys_initcall(atmel_soc_device_init); 232