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authorAbel Vesa <abel.vesa@nxp.com>2019-03-22 16:49:20 +0000
committerShawn Guo <shawnguo@kernel.org>2019-04-20 21:26:36 +0800
commita7e26f356ca12906a164d83c9e9f8527ee7da022 (patch)
tree3fb720025323eaecb28cd9d0fcca7257c719029c /drivers/soc
parent851826c7566e9bb4d03eb050634031ecc802affb (diff)
downloadlinux-a7e26f356ca12906a164d83c9e9f8527ee7da022.tar.bz2
soc: imx: Add generic i.MX8 SoC driver
Add generic i.MX8 SoC driver along with the i.MX8MQ SoC specific code. For now, only i.MX8MQ revision B1 is supported. For any other, i.MX8MQ revision it will print 'unknown'. Signed-off-by: Abel Vesa <abel.vesa@nxp.com> Reviewed-by: Leonard Crestez <leonard.crestez@nxp.com> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Diffstat (limited to 'drivers/soc')
-rw-r--r--drivers/soc/imx/Makefile1
-rw-r--r--drivers/soc/imx/soc-imx8.c115
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);