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Subject[PATCH 1/2] soc: imx: add i.MX8QXP SoC driver support
Date
Add i.MX8QXP SoC driver support, introduce driver dependency
into Kconfig as CONFIG_IMX_SCU must be selected to support
i.MX8QXP, also need to use platform driver model to make sure
IMX_SCU driver is probed before i.MX8 SoC driver.

With this patch, SoC info can be read from sysfs:

i.mx8qxp-mek# cat /sys/devices/soc0/family
Freescale i.MX

i.mx8qxp-mek# cat /sys/devices/soc0/soc_id
i.MX8QXP

i.mx8qxp-mek# cat /sys/devices/soc0/machine
Freescale i.MX8QXP MEK

i.mx8qxp-mek# cat /sys/devices/soc0/revision
1.1

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
---
drivers/soc/imx/Kconfig | 4 ++
drivers/soc/imx/Makefile | 2 +-
drivers/soc/imx/soc-imx8.c | 126 ++++++++++++++++++++++++++++++++++++++++++---
3 files changed, 124 insertions(+), 8 deletions(-)

diff --git a/drivers/soc/imx/Kconfig b/drivers/soc/imx/Kconfig
index d80f899..a4353f9 100644
--- a/drivers/soc/imx/Kconfig
+++ b/drivers/soc/imx/Kconfig
@@ -7,4 +7,8 @@ config IMX_GPCV2_PM_DOMAINS
select PM_GENERIC_DOMAINS
default y if SOC_IMX7D

+config IMX8_SOC
+ bool "i.MX8 SoC driver"
+ depends on ARCH_MXC && IMX_SCU
+
endmenu
diff --git a/drivers/soc/imx/Makefile b/drivers/soc/imx/Makefile
index d6b529e0..5bf23f8 100644
--- a/drivers/soc/imx/Makefile
+++ b/drivers/soc/imx/Makefile
@@ -1,3 +1,3 @@
obj-$(CONFIG_HAVE_IMX_GPC) += gpc.o
obj-$(CONFIG_IMX_GPCV2_PM_DOMAINS) += gpcv2.o
-obj-$(CONFIG_ARCH_MXC) += soc-imx8.o
+obj-$(CONFIG_IMX8_SOC) += soc-imx8.o
diff --git a/drivers/soc/imx/soc-imx8.c b/drivers/soc/imx/soc-imx8.c
index fc6429f..3ad0b1c 100644
--- a/drivers/soc/imx/soc-imx8.c
+++ b/drivers/soc/imx/soc-imx8.c
@@ -3,8 +3,11 @@
* Copyright 2019 NXP.
*/

+#include <dt-bindings/firmware/imx/rsrc.h>
+#include <linux/firmware/imx/sci.h>
#include <linux/init.h>
#include <linux/io.h>
+#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>
@@ -16,12 +19,61 @@
#define IMX8MQ_SW_INFO_B1 0x40
#define IMX8MQ_SW_MAGIC_B1 0xff0055aa

+#define IMX8_SOC_DRIVER_NAME "imx8-soc"
+
+static struct imx_sc_ipc *soc_ipc_handle;
+static struct platform_device *imx8_soc_pdev;
+
+struct imx_sc_msg_misc_get_soc_id {
+ struct imx_sc_rpc_msg hdr;
+ union {
+ struct {
+ u32 control;
+ u16 resource;
+ } send;
+ struct {
+ u32 id;
+ u16 reserved;
+ } resp;
+ } data;
+};
+
struct imx8_soc_data {
char *name;
u32 (*soc_revision)(void);
+ bool have_imx_scu;
};

-static u32 __init imx8mq_soc_revision(void)
+static u32 imx8qxp_soc_revision(void)
+{
+ struct imx_sc_msg_misc_get_soc_id msg;
+ struct imx_sc_rpc_msg *hdr = &msg.hdr;
+ u32 rev = 0;
+ int ret;
+
+ hdr->ver = IMX_SC_RPC_VERSION;
+ hdr->svc = IMX_SC_RPC_SVC_MISC;
+ hdr->func = IMX_SC_MISC_FUNC_GET_CONTROL;
+ hdr->size = 3;
+
+ msg.data.send.control = IMX_SC_C_ID;
+ msg.data.send.resource = IMX_SC_R_SYSTEM;
+
+ ret = imx_scu_call_rpc(soc_ipc_handle, &msg, true);
+ if (ret) {
+ dev_err(&imx8_soc_pdev->dev,
+ "misc get control failed, ret %d\n", ret);
+ return rev;
+ }
+
+ /* format revision value passed from SCU firmware */
+ rev = (msg.data.resp.id >> 5) & 0xf;
+ rev = (((rev >> 2) + 1) << 4) | (rev & 0x3);
+
+ return rev;
+}
+
+static u32 imx8mq_soc_revision(void)
{
struct device_node *np;
void __iomem *ocotp_base;
@@ -49,10 +101,18 @@ static u32 __init imx8mq_soc_revision(void)
static const struct imx8_soc_data imx8mq_soc_data = {
.name = "i.MX8MQ",
.soc_revision = imx8mq_soc_revision,
+ .have_imx_scu = false,
+};
+
+static const struct imx8_soc_data imx8qxp_soc_data = {
+ .name = "i.MX8QXP",
+ .soc_revision = imx8qxp_soc_revision,
+ .have_imx_scu = true,
};

static const struct of_device_id imx8_soc_match[] = {
{ .compatible = "fsl,imx8mq", .data = &imx8mq_soc_data, },
+ { .compatible = "fsl,imx8qxp", .data = &imx8qxp_soc_data, },
{ }
};

@@ -61,7 +121,7 @@ static const struct of_device_id imx8_soc_match[] = {
kasprintf(GFP_KERNEL, "%d.%d", (soc_rev >> 4) & 0xf, soc_rev & 0xf) : \
"unknown"

-static int __init imx8_soc_init(void)
+static int imx8_soc_probe(struct platform_device *pdev)
{
struct soc_device_attribute *soc_dev_attr;
struct soc_device *soc_dev;
@@ -83,25 +143,37 @@ static int __init imx8_soc_init(void)
goto free_soc;

id = of_match_node(imx8_soc_match, root);
- if (!id)
+ if (!id) {
+ ret = -ENODEV;
goto free_soc;
+ }

of_node_put(root);

data = id->data;
if (data) {
+ if (data->have_imx_scu) {
+ ret = imx_scu_get_handle(&soc_ipc_handle);
+ if (ret)
+ goto free_soc;
+ }
+
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)
+ if (!soc_dev_attr->revision) {
+ ret = -ENODEV;
goto free_soc;
+ }

soc_dev = soc_device_register(soc_dev_attr);
- if (IS_ERR(soc_dev))
+ if (IS_ERR(soc_dev)) {
+ ret = -ENODEV;
goto free_rev;
+ }

return 0;

@@ -110,6 +182,46 @@ static int __init imx8_soc_init(void)
free_soc:
kfree(soc_dev_attr);
of_node_put(root);
- return -ENODEV;
+ return ret;
}
-device_initcall(imx8_soc_init);
+
+static struct platform_driver imx8_soc_driver = {
+ .driver = {
+ .name = IMX8_SOC_DRIVER_NAME,
+ },
+ .probe = imx8_soc_probe,
+};
+
+static int __init imx8_soc_init(void)
+{
+ int ret;
+
+ ret = platform_driver_register(&imx8_soc_driver);
+ if (ret)
+ return ret;
+
+ imx8_soc_pdev =
+ platform_device_register_simple(IMX8_SOC_DRIVER_NAME,
+ -1,
+ NULL,
+ 0);
+ if (IS_ERR(imx8_soc_pdev)) {
+ ret = PTR_ERR(imx8_soc_pdev);
+ goto unreg_platform_driver;
+ }
+
+ return 0;
+
+unreg_platform_driver:
+ platform_driver_unregister(&imx8_soc_driver);
+ return ret;
+}
+
+static void __exit imx8_soc_exit(void)
+{
+ platform_device_unregister(imx8_soc_pdev);
+ platform_driver_unregister(&imx8_soc_driver);
+}
+
+module_init(imx8_soc_init);
+module_exit(imx8_soc_exit);
--
2.7.4
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