1 // SPDX-License-Identifier: GPL-2.0
6 #include <linux/init.h>
8 #include <linux/of_address.h>
9 #include <linux/slab.h>
10 #include <linux/sys_soc.h>
11 #include <linux/platform_device.h>
12 #include <linux/arm-smccc.h>
17 #define IMX8MQ_SW_INFO_B1 0x40
18 #define IMX8MQ_SW_MAGIC_B1 0xff0055aa
20 #define IMX_SIP_GET_SOC_INFO 0xc2000006
22 #define OCOTP_UID_LOW 0x410
23 #define OCOTP_UID_HIGH 0x420
25 #define IMX8MP_OCOTP_UID_OFFSET 0x10
27 /* Same as ANADIG_DIGPROG_IMX7D */
28 #define ANADIG_DIGPROG_IMX8MM 0x800
30 struct imx8_soc_data {
32 u32 (*soc_revision)(void);
37 #ifdef CONFIG_HAVE_ARM_SMCCC
38 static u32 imx8mq_soc_revision_from_atf(void)
40 struct arm_smccc_res res;
42 arm_smccc_smc(IMX_SIP_GET_SOC_INFO, 0, 0, 0, 0, 0, 0, 0, &res);
44 if (res.a0 == SMCCC_RET_NOT_SUPPORTED)
50 static inline u32 imx8mq_soc_revision_from_atf(void) { return 0; };
53 static u32 __init imx8mq_soc_revision(void)
55 struct device_node *np;
56 void __iomem *ocotp_base;
60 np = of_find_compatible_node(NULL, NULL, "fsl,imx8mq-ocotp");
64 ocotp_base = of_iomap(np, 0);
68 * SOC revision on older imx8mq is not available in fuses so query
69 * the value from ATF instead.
71 rev = imx8mq_soc_revision_from_atf();
73 magic = readl_relaxed(ocotp_base + IMX8MQ_SW_INFO_B1);
74 if (magic == IMX8MQ_SW_MAGIC_B1)
78 soc_uid = readl_relaxed(ocotp_base + OCOTP_UID_HIGH);
80 soc_uid |= readl_relaxed(ocotp_base + OCOTP_UID_LOW);
88 static void __init imx8mm_soc_uid(void)
90 void __iomem *ocotp_base;
91 struct device_node *np;
92 u32 offset = of_machine_is_compatible("fsl,imx8mp") ?
93 IMX8MP_OCOTP_UID_OFFSET : 0;
95 np = of_find_compatible_node(NULL, NULL, "fsl,imx8mm-ocotp");
99 ocotp_base = of_iomap(np, 0);
100 WARN_ON(!ocotp_base);
102 soc_uid = readl_relaxed(ocotp_base + OCOTP_UID_HIGH + offset);
104 soc_uid |= readl_relaxed(ocotp_base + OCOTP_UID_LOW + offset);
110 static u32 __init imx8mm_soc_revision(void)
112 struct device_node *np;
113 void __iomem *anatop_base;
116 np = of_find_compatible_node(NULL, NULL, "fsl,imx8mm-anatop");
120 anatop_base = of_iomap(np, 0);
121 WARN_ON(!anatop_base);
123 rev = readl_relaxed(anatop_base + ANADIG_DIGPROG_IMX8MM);
125 iounmap(anatop_base);
133 static const struct imx8_soc_data imx8mq_soc_data = {
135 .soc_revision = imx8mq_soc_revision,
138 static const struct imx8_soc_data imx8mm_soc_data = {
140 .soc_revision = imx8mm_soc_revision,
143 static const struct imx8_soc_data imx8mn_soc_data = {
145 .soc_revision = imx8mm_soc_revision,
148 static const struct imx8_soc_data imx8mp_soc_data = {
150 .soc_revision = imx8mm_soc_revision,
153 static __maybe_unused const struct of_device_id imx8_soc_match[] = {
154 { .compatible = "fsl,imx8mq", .data = &imx8mq_soc_data, },
155 { .compatible = "fsl,imx8mm", .data = &imx8mm_soc_data, },
156 { .compatible = "fsl,imx8mn", .data = &imx8mn_soc_data, },
157 { .compatible = "fsl,imx8mp", .data = &imx8mp_soc_data, },
161 #define imx8_revision(soc_rev) \
163 kasprintf(GFP_KERNEL, "%d.%d", (soc_rev >> 4) & 0xf, soc_rev & 0xf) : \
166 static int __init imx8_soc_init(void)
168 struct soc_device_attribute *soc_dev_attr;
169 struct soc_device *soc_dev;
170 const struct of_device_id *id;
172 const struct imx8_soc_data *data;
175 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
179 soc_dev_attr->family = "Freescale i.MX";
181 ret = of_property_read_string(of_root, "model", &soc_dev_attr->machine);
185 id = of_match_node(imx8_soc_match, of_root);
193 soc_dev_attr->soc_id = data->name;
194 if (data->soc_revision)
195 soc_rev = data->soc_revision();
198 soc_dev_attr->revision = imx8_revision(soc_rev);
199 if (!soc_dev_attr->revision) {
204 soc_dev_attr->serial_number = kasprintf(GFP_KERNEL, "%016llX", soc_uid);
205 if (!soc_dev_attr->serial_number) {
210 soc_dev = soc_device_register(soc_dev_attr);
211 if (IS_ERR(soc_dev)) {
212 ret = PTR_ERR(soc_dev);
213 goto free_serial_number;
216 pr_info("SoC: %s revision %s\n", soc_dev_attr->soc_id,
217 soc_dev_attr->revision);
219 if (IS_ENABLED(CONFIG_ARM_IMX_CPUFREQ_DT))
220 platform_device_register_simple("imx-cpufreq-dt", -1, NULL, 0);
225 kfree(soc_dev_attr->serial_number);
227 if (strcmp(soc_dev_attr->revision, "unknown"))
228 kfree(soc_dev_attr->revision);
233 device_initcall(imx8_soc_init);