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Subject[PATCH] powernv: Add OCC driver to mmap sensor area
Date
This driver provides interface to mmap the OCC sensor area
to userspace to parse and read OCC inband sensors.

Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
---
- The skiboot patch for this is posted here:
https://lists.ozlabs.org/pipermail/skiboot/2017-September/009209.html

arch/powerpc/platforms/powernv/Makefile | 2 +-
arch/powerpc/platforms/powernv/opal-occ.c | 88 +++++++++++++++++++++++++++++++
arch/powerpc/platforms/powernv/opal.c | 3 ++
3 files changed, 92 insertions(+), 1 deletion(-)
create mode 100644 arch/powerpc/platforms/powernv/opal-occ.c

diff --git a/arch/powerpc/platforms/powernv/Makefile b/arch/powerpc/platforms/powernv/Makefile
index 37d60f7..7911295 100644
--- a/arch/powerpc/platforms/powernv/Makefile
+++ b/arch/powerpc/platforms/powernv/Makefile
@@ -2,7 +2,7 @@ obj-y += setup.o opal-wrappers.o opal.o opal-async.o idle.o
obj-y += opal-rtc.o opal-nvram.o opal-lpc.o opal-flash.o
obj-y += rng.o opal-elog.o opal-dump.o opal-sysparam.o opal-sensor.o
obj-y += opal-msglog.o opal-hmi.o opal-power.o opal-irqchip.o
-obj-y += opal-kmsg.o opal-powercap.o opal-psr.o opal-sensor-groups.o
+obj-y += opal-kmsg.o opal-powercap.o opal-psr.o opal-sensor-groups.o opal-occ.o

obj-$(CONFIG_SMP) += smp.o subcore.o subcore-asm.o
obj-$(CONFIG_PCI) += pci.o pci-ioda.o npu-dma.o
diff --git a/arch/powerpc/platforms/powernv/opal-occ.c b/arch/powerpc/platforms/powernv/opal-occ.c
new file mode 100644
index 0000000..5ca3a41
--- /dev/null
+++ b/arch/powerpc/platforms/powernv/opal-occ.c
@@ -0,0 +1,88 @@
+/*
+ * Copyright IBM Corporation 2017
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#define pr_fmt(fmt) "opal-occ: " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/miscdevice.h>
+#include <linux/highmem.h>
+#include <asm/opal.h>
+
+static struct miscdevice occ;
+static u64 sensor_base, sensor_size;
+
+static int opal_occ_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ if (vma->vm_flags & VM_WRITE)
+ return -EINVAL;
+
+ return vm_iomap_memory(vma, sensor_base, sensor_size);
+}
+
+static const struct file_operations opal_occ_fops = {
+ .mmap = opal_occ_mmap,
+ .owner = THIS_MODULE,
+};
+
+static int opal_occ_probe(struct platform_device *pdev)
+{
+ u64 reg[2];
+ int rc;
+
+ if (!pdev || !pdev->dev.of_node)
+ return -ENODEV;
+
+ if (of_property_read_u64_array(pdev->dev.of_node, "occ-sensors",
+ &reg[0], 2)) {
+ pr_warn("occ-sensors property not found\n");
+ return -ENODEV;
+ }
+
+ sensor_base = reg[0];
+ sensor_size = reg[1];
+ occ.minor = MISC_DYNAMIC_MINOR;
+ occ.name = "occ";
+ occ.fops = &opal_occ_fops;
+ rc = misc_register(&occ);
+ if (rc)
+ pr_warn("Failed to register OCC device\n");
+
+ return rc;
+}
+
+static int opal_occ_remove(struct platform_device *pdev)
+{
+ misc_deregister(&occ);
+ return 0;
+}
+
+static const struct of_device_id opal_occ_match[] = {
+ { .compatible = "ibm,opal-occ-inband-sensors" },
+ { },
+};
+
+static struct platform_driver opal_occ_driver = {
+ .driver = {
+ .name = "opal_occ",
+ .of_match_table = opal_occ_match,
+ },
+ .probe = opal_occ_probe,
+ .remove = opal_occ_remove,
+};
+
+module_platform_driver(opal_occ_driver);
+
+MODULE_DESCRIPTION("PowerNV OPAL-OCC driver");
+MODULE_LICENSE("GPL");
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
index 65c79ec..a4f977f 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -889,6 +889,9 @@ static int __init opal_init(void)
/* Initialise OPAL sensor groups */
opal_sensor_groups_init();

+ /* Initialise OCC driver */
+ opal_pdev_init("ibm,opal-occ-inband-sensors");
+
return 0;
}
machine_subsys_initcall(powernv, opal_init);
--
1.8.3.1
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