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Message-Id: <20230110042533.12894-2-clayc@hpe.com>
Date: Tue, 10 Jan 2023 12:25:29 +0800
From: clayc@....com
To: linux-kernel@...r.kernel.org, soc@...nel.org,
linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
verdun@....com, nick.hawkins@....com, arnd@...db.de,
robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
linux@...linux.org.uk, olof@...om.net
Cc: Clay Chang <clayc@....com>
Subject: [PATCH 1/5] soc: hpe: Add GXP SROM Control Register Driver
From: Clay Chang <clayc@....com>
The GXP SROM control register can be used to configure LPC related
legacy I/O registers. Currently only the SROM RAM Offset Register
(vromoff) is exported.
The GXP SOCLIB is a common library used for creating the common
"soc" class in the kernel.
Signed-off-by: Clay Chang <clayc@....com>
---
drivers/soc/Kconfig | 1 +
drivers/soc/Makefile | 1 +
drivers/soc/hpe/Kconfig | 29 +++++++
drivers/soc/hpe/Makefile | 2 +
drivers/soc/hpe/gxp-soclib.c | 17 +++++
drivers/soc/hpe/gxp-soclib.h | 9 +++
drivers/soc/hpe/gxp-srom.c | 141 +++++++++++++++++++++++++++++++++++
7 files changed, 200 insertions(+)
create mode 100644 drivers/soc/hpe/Kconfig
create mode 100644 drivers/soc/hpe/Makefile
create mode 100644 drivers/soc/hpe/gxp-soclib.c
create mode 100644 drivers/soc/hpe/gxp-soclib.h
create mode 100644 drivers/soc/hpe/gxp-srom.c
diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
index 5dbb09f843f7..faff0f036b61 100644
--- a/drivers/soc/Kconfig
+++ b/drivers/soc/Kconfig
@@ -10,6 +10,7 @@ source "drivers/soc/bcm/Kconfig"
source "drivers/soc/canaan/Kconfig"
source "drivers/soc/fsl/Kconfig"
source "drivers/soc/fujitsu/Kconfig"
+source "drivers/soc/hpe/Kconfig"
source "drivers/soc/imx/Kconfig"
source "drivers/soc/ixp4xx/Kconfig"
source "drivers/soc/litex/Kconfig"
diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
index fff513bd522d..d257b9d654b3 100644
--- a/drivers/soc/Makefile
+++ b/drivers/soc/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_MACH_DOVE) += dove/
obj-y += fsl/
obj-y += fujitsu/
obj-$(CONFIG_ARCH_GEMINI) += gemini/
+obj-$(CONFIG_ARCH_HPE) += hpe/
obj-y += imx/
obj-y += ixp4xx/
obj-$(CONFIG_SOC_XWAY) += lantiq/
diff --git a/drivers/soc/hpe/Kconfig b/drivers/soc/hpe/Kconfig
new file mode 100644
index 000000000000..88f5d46b06b6
--- /dev/null
+++ b/drivers/soc/hpe/Kconfig
@@ -0,0 +1,29 @@
+#
+# HPE GXP SoC drivers
+#
+menu "HPE GXP SoC drivers"
+ depends on ARCH_HPE || COMPILE_TEST
+
+config HPE_GXP_SOCLIB
+ bool "GXP Common SoC Library"
+ default y
+ depends on ARCH_HPE_GXP || COMPILE_TEST
+ help
+ This is for the common library for all HPE SoC drivers. It
+ creates the root soc class (/sys/class/soc) for all GXP SoC
+ drivers. It must be yes if any one of the GXP SoC drivers were
+ added, so the config of all GXP SoC drivers must select this.
+
+
+config HPE_GXP_SROM
+ bool "GXP SROM Configuration Driver"
+ default y
+ depends on ARCH_HPE_GXP || COMPILE_TEST
+ select HPE_GXP_SOCLIB
+ help
+ Say yes here to add support for SROM Configuration. The GXP SROM
+ control register can be used to configure LPC related legacy I/O
+ registers. Currently only the SROM RAM Offset Register (vromoff)
+ is exported.
+
+endmenu
diff --git a/drivers/soc/hpe/Makefile b/drivers/soc/hpe/Makefile
new file mode 100644
index 000000000000..78de24ecb606
--- /dev/null
+++ b/drivers/soc/hpe/Makefile
@@ -0,0 +1,2 @@
+obj-$(CONFIG_HPE_GXP_SOCLIB) += gxp-soclib.o
+obj-$(CONFIG_HPE_GXP_SROM) += gxp-srom.o
diff --git a/drivers/soc/hpe/gxp-soclib.c b/drivers/soc/hpe/gxp-soclib.c
new file mode 100644
index 000000000000..11b0afe09070
--- /dev/null
+++ b/drivers/soc/hpe/gxp-soclib.c
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (C) 2023 Hewlett Packard Enteprise Development Company, L.P. */
+
+#include <linux/device.h>
+#include <linux/module.h>
+
+struct class *soc_class;
+
+static int __init gxp_soclib_init(void)
+{
+ soc_class = class_create(THIS_MODULE, "soc");
+ if (IS_ERR(soc_class))
+ return PTR_ERR(soc_class);
+ return 0;
+}
+
+module_init(gxp_soclib_init);
diff --git a/drivers/soc/hpe/gxp-soclib.h b/drivers/soc/hpe/gxp-soclib.h
new file mode 100644
index 000000000000..eb0e72b67aee
--- /dev/null
+++ b/drivers/soc/hpe/gxp-soclib.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* Copyright (C) 2023 Hewlett Packard Enterprise Development Company, L.P. */
+
+#ifndef __GXP_SOCLIB_H__
+#define __GXP_SOCLIB_H__
+
+extern struct class *soc_class;
+
+#endif
diff --git a/drivers/soc/hpe/gxp-srom.c b/drivers/soc/hpe/gxp-srom.c
new file mode 100644
index 000000000000..5a8f005055cf
--- /dev/null
+++ b/drivers/soc/hpe/gxp-srom.c
@@ -0,0 +1,141 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (C) 2023 Hewlett Packard Enterprise Development Company, L.P. */
+
+#include <linux/device.h>
+#include <linux/mutex.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/sysfs.h>
+
+#include "gxp-soclib.h"
+
+#define SROM_VROMOFF 0xf4 // 80fc_00f4
+
+struct gxp_srom_drvdata {
+ struct platform_device *pdev;
+ struct device *dev;
+ void __iomem *base;
+ struct mutex mutex;
+};
+
+static ssize_t vromoff_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct gxp_srom_drvdata *drvdata = dev_get_drvdata(dev);
+ unsigned int value;
+ ssize_t ret;
+
+ mutex_lock(&drvdata->mutex);
+ value = readl(drvdata->base + SROM_VROMOFF);
+ ret = sprintf(buf, "0x%08x", value);
+ mutex_unlock(&drvdata->mutex);
+
+ return ret;
+}
+
+static ssize_t vromoff_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct gxp_srom_drvdata *drvdata = dev_get_drvdata(dev);
+ unsigned int value;
+ int rc;
+
+ rc = kstrtouint(buf, 0, &value);
+ if (rc < 0)
+ return -EINVAL;
+
+ mutex_lock(&drvdata->mutex);
+ writel(value, drvdata->base + SROM_VROMOFF);
+ mutex_unlock(&drvdata->mutex);
+
+ return count;
+}
+static DEVICE_ATTR_RW(vromoff);
+
+static struct attribute *srom_attrs[] = {
+ &dev_attr_vromoff.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(srom);
+
+static int sysfs_register(struct device *parent,
+ struct gxp_srom_drvdata *drvdata)
+{
+ struct device *dev;
+
+ dev = device_create_with_groups(soc_class, parent, 0,
+ drvdata, srom_groups, "srom");
+ if (IS_ERR(dev))
+ return PTR_ERR(dev);
+ drvdata->dev = dev;
+ return 0;
+}
+
+static int gxp_srom_probe(struct platform_device *pdev)
+{
+ struct gxp_srom_drvdata *drvdata;
+ struct resource *res;
+ int ret;
+
+ drvdata = devm_kzalloc(&pdev->dev, sizeof(struct gxp_srom_drvdata),
+ GFP_KERNEL);
+ if (!drvdata)
+ return -ENOMEM;
+
+ drvdata->pdev = pdev;
+ platform_set_drvdata(pdev, drvdata);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "no srom resource defined\n");
+ ret = -ENODEV;
+ goto out;
+ }
+
+ drvdata->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(drvdata->base)) {
+ dev_err(&pdev->dev, "ioremap_resource error\n");
+ ret = PTR_ERR(drvdata->base);
+ goto ioremap_err;
+ }
+
+ mutex_init(&drvdata->mutex);
+
+ ret = sysfs_register(&pdev->dev, drvdata);
+ if (ret != 0) {
+ dev_err(&pdev->dev, "sysfs error\n");
+ goto sysfs_err;
+ }
+
+ dev_info(&pdev->dev, "initialized\n");
+ return 0;
+
+sysfs_err:
+ioremap_err:
+ platform_set_drvdata(pdev, NULL);
+out:
+ if (drvdata)
+ devm_kfree(&pdev->dev, (void *)drvdata);
+ return ret;
+}
+
+static const struct of_device_id gxp_srom_of_match[] = {
+ { .compatible = "hpe,gxp-srom" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, gxp_srom_of_match);
+
+static struct platform_driver gxp_srom_driver = {
+ .probe = gxp_srom_probe,
+ .driver = {
+ .name = "gxp-srom",
+ .of_match_table = of_match_ptr(gxp_srom_of_match),
+ },
+};
+module_platform_driver(gxp_srom_driver);
+
+MODULE_AUTHOR("Clay Chang <clayc@....com>");
+MODULE_DESCRIPTION("HPE GXP SROM Configuration Driver");
+MODULE_LICENSE("GPL");
--
2.17.1
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