[PATCH v6] soc: nuvoton: Add SoC info driver for WPCM450
Jonathan Neuschäfer
j.neuschaefer at gmx.net
Fri Nov 4 08:34:15 AEDT 2022
Add a SoC information driver for Nuvoton WPCM450 SoCs. It provides
information such as the SoC revision.
Usage example:
# grep . /sys/devices/soc0/*
/sys/devices/soc0/family:Nuvoton NPCM
/sys/devices/soc0/revision:A3
/sys/devices/soc0/soc_id:WPCM450
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer at gmx.net>
Reviewed-by: Joel Stanley <joel at jms.id.au>
Reviewed-by: Paul Menzel <pmenzel at molgen.mpg.de>
---
v6:
- Select REGMAP
- Rearrange Kconfig structure a bit
v5:
- Change Kconfig option from bool to tristate
v4:
- rebase on 5.19-rc1
v3:
- Declare revisions array as static
- Change get_revision parameter to `unsigned int`
- Add Paul's R-b tag
- Add usage example
- Sort includes
v2:
- https://lore.kernel.org/lkml/20220409173319.2491196-1-j.neuschaefer@gmx.net/
- Add R-b tag
- rebase on 5.18-rc1
v1:
- https://lore.kernel.org/lkml/20220129143316.2321460-1-j.neuschaefer@gmx.net/
---
drivers/soc/Kconfig | 1 +
drivers/soc/Makefile | 1 +
drivers/soc/nuvoton/Kconfig | 17 +++++
drivers/soc/nuvoton/Makefile | 2 +
drivers/soc/nuvoton/wpcm450-soc.c | 109 ++++++++++++++++++++++++++++++
5 files changed, 130 insertions(+)
create mode 100644 drivers/soc/nuvoton/Kconfig
create mode 100644 drivers/soc/nuvoton/Makefile
create mode 100644 drivers/soc/nuvoton/wpcm450-soc.c
diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
index e461c071189b4..f17764a7e5884 100644
--- a/drivers/soc/Kconfig
+++ b/drivers/soc/Kconfig
@@ -15,6 +15,7 @@ source "drivers/soc/ixp4xx/Kconfig"
source "drivers/soc/litex/Kconfig"
source "drivers/soc/mediatek/Kconfig"
source "drivers/soc/microchip/Kconfig"
+source "drivers/soc/nuvoton/Kconfig"
source "drivers/soc/pxa/Kconfig"
source "drivers/soc/qcom/Kconfig"
source "drivers/soc/renesas/Kconfig"
diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
index 69ba6508cf2c1..9f92506854852 100644
--- a/drivers/soc/Makefile
+++ b/drivers/soc/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_SOC_XWAY) += lantiq/
obj-$(CONFIG_LITEX_SOC_CONTROLLER) += litex/
obj-y += mediatek/
obj-y += microchip/
+obj-y += nuvoton/
obj-y += pxa/
obj-y += amlogic/
obj-y += qcom/
diff --git a/drivers/soc/nuvoton/Kconfig b/drivers/soc/nuvoton/Kconfig
new file mode 100644
index 0000000000000..2167d3d739d84
--- /dev/null
+++ b/drivers/soc/nuvoton/Kconfig
@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: GPL-2.0
+menu "Nuvoton SoC drivers"
+ depends on ARCH_NPCM || COMPILE_TEST
+
+config WPCM450_SOC
+ tristate "Nuvoton WPCM450 SoC driver"
+ default y if ARCH_WPCM450
+ select SOC_BUS
+ select REGMAP
+ help
+ Say Y here to compile the SoC information driver for Nuvoton
+ WPCM450 SoCs.
+
+ This driver provides information such as the SoC model and
+ revision.
+
+endmenu
diff --git a/drivers/soc/nuvoton/Makefile b/drivers/soc/nuvoton/Makefile
new file mode 100644
index 0000000000000..e30317b4e8290
--- /dev/null
+++ b/drivers/soc/nuvoton/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_WPCM450_SOC) += wpcm450-soc.o
diff --git a/drivers/soc/nuvoton/wpcm450-soc.c b/drivers/soc/nuvoton/wpcm450-soc.c
new file mode 100644
index 0000000000000..c5e0d11c383b1
--- /dev/null
+++ b/drivers/soc/nuvoton/wpcm450-soc.c
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Nuvoton WPCM450 SoC Identification
+ *
+ * Copyright (C) 2022 Jonathan Neuschäfer
+ */
+
+#include <linux/mfd/syscon.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/sys_soc.h>
+
+#define GCR_PDID 0
+#define PDID_CHIP(x) ((x) & 0x00ffffff)
+#define CHIP_WPCM450 0x926450
+#define PDID_REV(x) ((x) >> 24)
+
+struct revision {
+ u8 number;
+ const char *name;
+};
+
+static const struct revision revisions[] __initconst = {
+ { 0x00, "Z1" },
+ { 0x03, "Z2" },
+ { 0x04, "Z21" },
+ { 0x08, "A1" },
+ { 0x09, "A2" },
+ { 0x0a, "A3" },
+ {}
+};
+
+static const char * __init get_revision(unsigned int rev)
+{
+ int i;
+
+ for (i = 0; revisions[i].name; i++)
+ if (revisions[i].number == rev)
+ return revisions[i].name;
+ return NULL;
+}
+
+static struct soc_device_attribute *wpcm450_attr;
+static struct soc_device *wpcm450_soc;
+
+static int __init wpcm450_soc_init(void)
+{
+ struct soc_device_attribute *attr;
+ struct soc_device *soc;
+ const char *revision;
+ struct regmap *gcr;
+ u32 pdid;
+ int ret;
+
+ if (!of_machine_is_compatible("nuvoton,wpcm450"))
+ return 0;
+
+ gcr = syscon_regmap_lookup_by_compatible("nuvoton,wpcm450-gcr");
+ if (IS_ERR(gcr))
+ return PTR_ERR(gcr);
+ ret = regmap_read(gcr, GCR_PDID, &pdid);
+ if (ret)
+ return ret;
+
+ if (PDID_CHIP(pdid) != CHIP_WPCM450) {
+ pr_warn("Unknown chip ID in GCR.PDID: 0x%06x\n", PDID_CHIP(pdid));
+ return -ENODEV;
+ }
+
+ revision = get_revision(PDID_REV(pdid));
+ if (!revision) {
+ pr_warn("Unknown chip revision in GCR.PDID: 0x%02x\n", PDID_REV(pdid));
+ return -ENODEV;
+ }
+
+ attr = kzalloc(sizeof(*attr), GFP_KERNEL);
+ if (!attr)
+ return -ENOMEM;
+
+ attr->family = "Nuvoton NPCM";
+ attr->soc_id = "WPCM450";
+ attr->revision = revision;
+ soc = soc_device_register(attr);
+ if (IS_ERR(soc)) {
+ kfree(attr);
+ pr_warn("Could not register SoC device\n");
+ return PTR_ERR(soc);
+ }
+
+ wpcm450_soc = soc;
+ wpcm450_attr = attr;
+ return 0;
+}
+module_init(wpcm450_soc_init);
+
+static void __exit wpcm450_soc_exit(void)
+{
+ if (wpcm450_soc) {
+ soc_device_unregister(wpcm450_soc);
+ wpcm450_soc = NULL;
+ kfree(wpcm450_attr);
+ }
+}
+module_exit(wpcm450_soc_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jonathan Neuschäfer");
+MODULE_DESCRIPTION("Nuvoton WPCM450 SoC Identification driver");
--
2.35.1
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