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.b...@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", + ®[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
