1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/err.h> 3 #include <linux/mfd/syscon.h> 4 #include <linux/module.h> 5 #include <linux/io.h> 6 #include <linux/of.h> 7 #include <linux/of_address.h> 8 #include <linux/regmap.h> 9 #include <linux/slab.h> 10 #include <linux/sys_soc.h> 11 12 #include "hardware.h" 13 #include "common.h" 14 15 #define OCOTP_UID_H 0x420 16 #define OCOTP_UID_L 0x410 17 18 unsigned int __mxc_cpu_type; 19 static unsigned int imx_soc_revision; 20 21 void mxc_set_cpu_type(unsigned int type) 22 { 23 __mxc_cpu_type = type; 24 } 25 26 void imx_set_soc_revision(unsigned int rev) 27 { 28 imx_soc_revision = rev; 29 } 30 31 unsigned int imx_get_soc_revision(void) 32 { 33 return imx_soc_revision; 34 } 35 36 void imx_print_silicon_rev(const char *cpu, int srev) 37 { 38 if (srev == IMX_CHIP_REVISION_UNKNOWN) 39 pr_info("CPU identified as %s, unknown revision\n", cpu); 40 else 41 pr_info("CPU identified as %s, silicon rev %d.%d\n", 42 cpu, (srev >> 4) & 0xf, srev & 0xf); 43 } 44 45 void __init imx_set_aips(void __iomem *base) 46 { 47 unsigned int reg; 48 /* 49 * Set all MPROTx to be non-bufferable, trusted for R/W, 50 * not forced to user-mode. 51 */ 52 imx_writel(0x77777777, base + 0x0); 53 imx_writel(0x77777777, base + 0x4); 54 55 /* 56 * Set all OPACRx to be non-bufferable, to not require 57 * supervisor privilege level for access, allow for 58 * write access and untrusted master access. 59 */ 60 imx_writel(0x0, base + 0x40); 61 imx_writel(0x0, base + 0x44); 62 imx_writel(0x0, base + 0x48); 63 imx_writel(0x0, base + 0x4C); 64 reg = imx_readl(base + 0x50) & 0x00FFFFFF; 65 imx_writel(reg, base + 0x50); 66 } 67 68 void __init imx_aips_allow_unprivileged_access( 69 const char *compat) 70 { 71 void __iomem *aips_base_addr; 72 struct device_node *np; 73 74 for_each_compatible_node(np, NULL, compat) { 75 aips_base_addr = of_iomap(np, 0); 76 WARN_ON(!aips_base_addr); 77 imx_set_aips(aips_base_addr); 78 } 79 } 80 81 struct device * __init imx_soc_device_init(void) 82 { 83 struct soc_device_attribute *soc_dev_attr; 84 const char *ocotp_compat = NULL; 85 struct soc_device *soc_dev; 86 struct device_node *root; 87 struct regmap *ocotp; 88 const char *soc_id; 89 u64 soc_uid = 0; 90 u32 val; 91 int ret; 92 93 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); 94 if (!soc_dev_attr) 95 return NULL; 96 97 soc_dev_attr->family = "Freescale i.MX"; 98 99 root = of_find_node_by_path("/"); 100 ret = of_property_read_string(root, "model", &soc_dev_attr->machine); 101 of_node_put(root); 102 if (ret) 103 goto free_soc; 104 105 switch (__mxc_cpu_type) { 106 case MXC_CPU_MX1: 107 soc_id = "i.MX1"; 108 break; 109 case MXC_CPU_MX21: 110 soc_id = "i.MX21"; 111 break; 112 case MXC_CPU_MX25: 113 soc_id = "i.MX25"; 114 break; 115 case MXC_CPU_MX27: 116 soc_id = "i.MX27"; 117 break; 118 case MXC_CPU_MX31: 119 soc_id = "i.MX31"; 120 break; 121 case MXC_CPU_MX35: 122 soc_id = "i.MX35"; 123 break; 124 case MXC_CPU_MX51: 125 soc_id = "i.MX51"; 126 break; 127 case MXC_CPU_MX53: 128 soc_id = "i.MX53"; 129 break; 130 case MXC_CPU_IMX6SL: 131 ocotp_compat = "fsl,imx6sl-ocotp"; 132 soc_id = "i.MX6SL"; 133 break; 134 case MXC_CPU_IMX6DL: 135 ocotp_compat = "fsl,imx6q-ocotp"; 136 soc_id = "i.MX6DL"; 137 break; 138 case MXC_CPU_IMX6SX: 139 ocotp_compat = "fsl,imx6sx-ocotp"; 140 soc_id = "i.MX6SX"; 141 break; 142 case MXC_CPU_IMX6Q: 143 ocotp_compat = "fsl,imx6q-ocotp"; 144 soc_id = "i.MX6Q"; 145 break; 146 case MXC_CPU_IMX6UL: 147 ocotp_compat = "fsl,imx6ul-ocotp"; 148 soc_id = "i.MX6UL"; 149 break; 150 case MXC_CPU_IMX6ULL: 151 ocotp_compat = "fsl,imx6ul-ocotp"; 152 soc_id = "i.MX6ULL"; 153 break; 154 case MXC_CPU_IMX6ULZ: 155 ocotp_compat = "fsl,imx6ul-ocotp"; 156 soc_id = "i.MX6ULZ"; 157 break; 158 case MXC_CPU_IMX6SLL: 159 ocotp_compat = "fsl,imx6sll-ocotp"; 160 soc_id = "i.MX6SLL"; 161 break; 162 case MXC_CPU_IMX7D: 163 ocotp_compat = "fsl,imx7d-ocotp"; 164 soc_id = "i.MX7D"; 165 break; 166 case MXC_CPU_IMX7ULP: 167 soc_id = "i.MX7ULP"; 168 break; 169 default: 170 soc_id = "Unknown"; 171 } 172 soc_dev_attr->soc_id = soc_id; 173 174 if (ocotp_compat) { 175 ocotp = syscon_regmap_lookup_by_compatible(ocotp_compat); 176 if (IS_ERR(ocotp)) 177 pr_err("%s: failed to find %s regmap!\n", __func__, ocotp_compat); 178 179 regmap_read(ocotp, OCOTP_UID_H, &val); 180 soc_uid = val; 181 regmap_read(ocotp, OCOTP_UID_L, &val); 182 soc_uid <<= 32; 183 soc_uid |= val; 184 } 185 186 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%d.%d", 187 (imx_soc_revision >> 4) & 0xf, 188 imx_soc_revision & 0xf); 189 if (!soc_dev_attr->revision) 190 goto free_soc; 191 192 soc_dev_attr->serial_number = kasprintf(GFP_KERNEL, "%016llX", soc_uid); 193 if (!soc_dev_attr->serial_number) 194 goto free_rev; 195 196 soc_dev = soc_device_register(soc_dev_attr); 197 if (IS_ERR(soc_dev)) 198 goto free_serial_number; 199 200 return soc_device_to_device(soc_dev); 201 202 free_serial_number: 203 kfree(soc_dev_attr->serial_number); 204 free_rev: 205 kfree(soc_dev_attr->revision); 206 free_soc: 207 kfree(soc_dev_attr); 208 return NULL; 209 } 210