linux-kernel - [PATCH] soc: imx: Add generic i.MX8 SoC driver

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Message-ID: <1549194583-7684-1-git-send-email-abel.vesa@nxp.com>
Date:   Sun, 3 Feb 2019 11:49:57 +0000
From:   Abel Vesa <abel.vesa@....com>
To:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Rob Herring <robh@...nel.org>, Abel Vesa <abelvesa@...ux.com>
CC:     dl-linux-imx <linux-imx@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Abel Vesa <abel.vesa@....com>
Subject: [PATCH] soc: imx: Add generic i.MX8 SoC driver

Add generic i.MX8 SoC driver along with the i.MX8MQ SoC specific code.

Signed-off-by: Abel Vesa <abel.vesa@....com>
---
 drivers/soc/imx/Makefile   |   1 +
 drivers/soc/imx/soc-imx8.c | 108 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 109 insertions(+)
 create mode 100644 drivers/soc/imx/soc-imx8.c

diff --git a/drivers/soc/imx/Makefile b/drivers/soc/imx/Makefile
index 506a6f3..d6b529e0 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 0000000..69fe04e
--- /dev/null
+++ b/drivers/soc/imx/soc-imx8.c
@@ -0,0 +1,108 @@
+// 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 ANADIG_DIGPROG		0x6c
+
+struct imx8_soc_data {
+	char *name;
+	u32 (*soc_revision)(void);
+};
+
+static u32 __init imx_init_revision_from_anatop(void)
+{
+	struct device_node *np;
+	void __iomem *anatop_base;
+	u32 digprog;
+
+	np = of_find_compatible_node(NULL, NULL, "fsl,imx8mq-anatop");
+	anatop_base = of_iomap(np, 0);
+	WARN_ON(!anatop_base);
+	digprog = readl_relaxed(anatop_base + ANADIG_DIGPROG);
+	iounmap(anatop_base);
+
+	/*
+	 * Bit[7:4] is the base layer revision,
+	 * Bit[3:0] is the metal layer revision
+	 * e.g. 0x10 stands for Tapeout 1.0
+	 */
+	return digprog & 0xff;
+}
+
+u32 imx8mq_soc_revision(void)
+{
+	return imx_init_revision_from_anatop();
+}
+
+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, },
+	{ }
+};
+
+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 = kasprintf(GFP_KERNEL, "%d.%d",
+					   (soc_rev >> 4) & 0xf,
+					    soc_rev & 0xf);
+	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);
+	return -ENODEV;
+}
+device_initcall(imx8_soc_init);
-- 
2.7.4