diff options
| -rw-r--r-- | drivers/soc/imx/Makefile | 1 | ||||
| -rw-r--r-- | drivers/soc/imx/soc-imx8.c | 115 |
2 files changed, 116 insertions, 0 deletions
diff --git a/drivers/soc/imx/Makefile b/drivers/soc/imx/Makefile index 506a6f3c2b9b..d6b529e06d9a 100644 --- a/drivers/soc/imx/Makefile +++ b/drivers/soc/imx/Makefile @@ -1,2 +1,3 @@ obj-$(CONFIG_HAVE_IMX_GPC) += gpc.o obj-$(CONFIG_IMX_GPCV2_PM_DOMAINS) += gpcv2.o +obj-$(CONFIG_ARCH_MXC) += soc-imx8.o diff --git a/drivers/soc/imx/soc-imx8.c b/drivers/soc/imx/soc-imx8.c new file mode 100644 index 000000000000..fc6429f9170a --- /dev/null +++ b/drivers/soc/imx/soc-imx8.c @@ -0,0 +1,115 @@ +// 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 + +struct imx8_soc_data { + char *name; + u32 (*soc_revision)(void); +}; + +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; + + iounmap(ocotp_base); + +out: + of_node_put(np); + return rev; +} + +static const struct imx8_soc_data imx8mq_soc_data = { + .name = "i.MX8MQ", + .soc_revision = imx8mq_soc_revision, +}; + +static const struct of_device_id imx8_soc_match[] = { + { .compatible = "fsl,imx8mq", .data = &imx8mq_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; + struct device_node *root; + 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 -ENODEV; + + soc_dev_attr->family = "Freescale i.MX"; + + root = of_find_node_by_path("/"); + ret = of_property_read_string(root, "model", &soc_dev_attr->machine); + if (ret) + goto free_soc; + + id = of_match_node(imx8_soc_match, root); + if (!id) + goto free_soc; + + of_node_put(root); + + 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) + goto free_soc; + + soc_dev = soc_device_register(soc_dev_attr); + if (IS_ERR(soc_dev)) + goto free_rev; + + return 0; + +free_rev: + kfree(soc_dev_attr->revision); +free_soc: + kfree(soc_dev_attr); + of_node_put(root); + return -ENODEV; +} +device_initcall(imx8_soc_init); |