| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright 2019 NXP. |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/io.h> |
| #include <linux/of_address.h> |
| #include <linux/slab.h> |
| #include <linux/sys_soc.h> |
| #include <linux/platform_device.h> |
| #include <linux/of.h> |
| |
| #define REV_B1 0x21 |
| |
| #define IMX8MQ_SW_INFO_B1 0x40 |
| #define IMX8MQ_SW_MAGIC_B1 0xff0055aa |
| |
| #define OCOTP_UID_LOW 0x410 |
| #define OCOTP_UID_HIGH 0x420 |
| |
| /* Same as ANADIG_DIGPROG_IMX7D */ |
| #define ANADIG_DIGPROG_IMX8MM 0x800 |
| |
| struct imx8_soc_data { |
| char *name; |
| u32 (*soc_revision)(void); |
| }; |
| |
| static u64 soc_uid; |
| |
| static ssize_t soc_uid_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| return sprintf(buf, "%016llX\n", soc_uid); |
| } |
| |
| static DEVICE_ATTR_RO(soc_uid); |
| |
| static u32 __init imx8mq_soc_revision(void) |
| { |
| struct device_node *np; |
| void __iomem *ocotp_base; |
| u32 magic; |
| u32 rev = 0; |
| |
| np = of_find_compatible_node(NULL, NULL, "fsl,imx8mq-ocotp"); |
| if (!np) |
| goto out; |
| |
| ocotp_base = of_iomap(np, 0); |
| WARN_ON(!ocotp_base); |
| |
| magic = readl_relaxed(ocotp_base + IMX8MQ_SW_INFO_B1); |
| if (magic == IMX8MQ_SW_MAGIC_B1) |
| rev = REV_B1; |
| |
| soc_uid = readl_relaxed(ocotp_base + OCOTP_UID_HIGH); |
| soc_uid <<= 32; |
| soc_uid |= readl_relaxed(ocotp_base + OCOTP_UID_LOW); |
| |
| iounmap(ocotp_base); |
| |
| out: |
| of_node_put(np); |
| return rev; |
| } |
| |
| static void __init imx8mm_soc_uid(void) |
| { |
| void __iomem *ocotp_base; |
| struct device_node *np; |
| |
| np = of_find_compatible_node(NULL, NULL, "fsl,imx8mm-ocotp"); |
| if (!np) |
| return; |
| |
| ocotp_base = of_iomap(np, 0); |
| WARN_ON(!ocotp_base); |
| |
| soc_uid = readl_relaxed(ocotp_base + OCOTP_UID_HIGH); |
| soc_uid <<= 32; |
| soc_uid |= readl_relaxed(ocotp_base + OCOTP_UID_LOW); |
| |
| iounmap(ocotp_base); |
| of_node_put(np); |
| } |
| |
| static u32 __init imx8mm_soc_revision(void) |
| { |
| struct device_node *np; |
| void __iomem *anatop_base; |
| u32 rev; |
| |
| np = of_find_compatible_node(NULL, NULL, "fsl,imx8mm-anatop"); |
| if (!np) |
| return 0; |
| |
| anatop_base = of_iomap(np, 0); |
| WARN_ON(!anatop_base); |
| |
| rev = readl_relaxed(anatop_base + ANADIG_DIGPROG_IMX8MM); |
| |
| iounmap(anatop_base); |
| of_node_put(np); |
| |
| imx8mm_soc_uid(); |
| |
| return rev; |
| } |
| |
| static const struct imx8_soc_data imx8mq_soc_data = { |
| .name = "i.MX8MQ", |
| .soc_revision = imx8mq_soc_revision, |
| }; |
| |
| static const struct imx8_soc_data imx8mm_soc_data = { |
| .name = "i.MX8MM", |
| .soc_revision = imx8mm_soc_revision, |
| }; |
| |
| static const struct imx8_soc_data imx8mn_soc_data = { |
| .name = "i.MX8MN", |
| .soc_revision = imx8mm_soc_revision, |
| }; |
| |
| static const struct of_device_id imx8_soc_match[] = { |
| { .compatible = "fsl,imx8mq", .data = &imx8mq_soc_data, }, |
| { .compatible = "fsl,imx8mm", .data = &imx8mm_soc_data, }, |
| { .compatible = "fsl,imx8mn", .data = &imx8mn_soc_data, }, |
| { } |
| }; |
| |
| #define imx8_revision(soc_rev) \ |
| soc_rev ? \ |
| kasprintf(GFP_KERNEL, "%d.%d", (soc_rev >> 4) & 0xf, soc_rev & 0xf) : \ |
| "unknown" |
| |
| static int __init imx8_soc_init(void) |
| { |
| struct soc_device_attribute *soc_dev_attr; |
| struct soc_device *soc_dev; |
| const struct of_device_id *id; |
| u32 soc_rev = 0; |
| const struct imx8_soc_data *data; |
| int ret; |
| |
| soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); |
| if (!soc_dev_attr) |
| return -ENOMEM; |
| |
| soc_dev_attr->family = "Freescale i.MX"; |
| |
| ret = of_property_read_string(of_root, "model", &soc_dev_attr->machine); |
| if (ret) |
| goto free_soc; |
| |
| id = of_match_node(imx8_soc_match, of_root); |
| if (!id) { |
| ret = -ENODEV; |
| goto free_soc; |
| } |
| |
| data = id->data; |
| if (data) { |
| soc_dev_attr->soc_id = data->name; |
| if (data->soc_revision) |
| soc_rev = data->soc_revision(); |
| } |
| |
| soc_dev_attr->revision = imx8_revision(soc_rev); |
| if (!soc_dev_attr->revision) { |
| ret = -ENOMEM; |
| goto free_soc; |
| } |
| |
| soc_dev = soc_device_register(soc_dev_attr); |
| if (IS_ERR(soc_dev)) { |
| ret = PTR_ERR(soc_dev); |
| goto free_rev; |
| } |
| |
| ret = device_create_file(soc_device_to_device(soc_dev), |
| &dev_attr_soc_uid); |
| if (ret) |
| goto free_rev; |
| |
| if (IS_ENABLED(CONFIG_ARM_IMX_CPUFREQ_DT)) |
| platform_device_register_simple("imx-cpufreq-dt", -1, NULL, 0); |
| |
| return 0; |
| |
| free_rev: |
| if (strcmp(soc_dev_attr->revision, "unknown")) |
| kfree(soc_dev_attr->revision); |
| free_soc: |
| kfree(soc_dev_attr); |
| return ret; |
| } |
| device_initcall(imx8_soc_init); |