| /* |
| * Google LWIS I/O Mapped Device Driver |
| * |
| * Copyright (c) 2018 Google, LLC |
| * |
| * 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. |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME "-ioreg-dev: " fmt |
| |
| #include "lwis_device_ioreg.h" |
| |
| #include <linux/device.h> |
| #include <linux/dma-iommu.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/slab.h> |
| #include <uapi/linux/sched/types.h> |
| |
| #include "lwis_interrupt.h" |
| #include "lwis_ioreg.h" |
| #include "lwis_periodic_io.h" |
| #include "lwis_util.h" |
| |
| #ifdef CONFIG_OF |
| #include "lwis_dt.h" |
| #endif |
| |
| #define LWIS_DRIVER_NAME "lwis-ioreg" |
| |
| static int lwis_ioreg_device_enable(struct lwis_device *lwis_dev); |
| static int lwis_ioreg_device_disable(struct lwis_device *lwis_dev); |
| static int lwis_ioreg_register_io(struct lwis_device *lwis_dev, struct lwis_io_entry *entry, |
| int access_size); |
| static int lwis_ioreg_register_io_barrier(struct lwis_device *lwis_dev, bool read, bool write); |
| |
| static struct lwis_device_subclass_operations ioreg_vops = { |
| .register_io = lwis_ioreg_register_io, |
| .register_io_barrier = lwis_ioreg_register_io_barrier, |
| .device_enable = lwis_ioreg_device_enable, |
| .device_disable = lwis_ioreg_device_disable, |
| .event_enable = NULL, |
| .event_flags_updated = NULL, |
| .close = NULL, |
| }; |
| |
| static int lwis_ioreg_device_enable(struct lwis_device *lwis_dev) |
| { |
| return 0; |
| } |
| |
| static int lwis_ioreg_device_disable(struct lwis_device *lwis_dev) |
| { |
| return 0; |
| } |
| |
| static int lwis_ioreg_register_io(struct lwis_device *lwis_dev, struct lwis_io_entry *entry, |
| int access_size) |
| { |
| lwis_save_register_io_info(lwis_dev, entry, access_size); |
| return lwis_ioreg_io_entry_rw((struct lwis_ioreg_device *)lwis_dev, entry, access_size); |
| } |
| |
| static int lwis_ioreg_register_io_barrier(struct lwis_device *lwis_dev, bool use_read_barrier, |
| bool use_write_barrier) |
| { |
| return lwis_ioreg_set_io_barrier((struct lwis_ioreg_device *)lwis_dev, use_read_barrier, |
| use_write_barrier); |
| } |
| |
| static int lwis_ioreg_device_setup(struct lwis_ioreg_device *ioreg_dev) |
| { |
| int ret = 0; |
| |
| #ifdef CONFIG_OF |
| /* Parse device tree for device configurations */ |
| ret = lwis_ioreg_device_parse_dt(ioreg_dev); |
| if (ret) { |
| dev_err(ioreg_dev->base_dev.dev, "Failed to parse device tree\n"); |
| } |
| #else |
| /* Non-device-tree init: Save for future implementation */ |
| ret = -ENOSYS; |
| #endif |
| |
| if (ioreg_dev->iommu_best_fit_algo) { |
| ret = iommu_dma_enable_best_fit_algo(ioreg_dev->base_dev.k_dev); |
| if (ret) { |
| dev_warn(ioreg_dev->base_dev.dev, "Cannot enable IOMMU best fit algo\n"); |
| /* Skip best fit algo error */ |
| ret = 0; |
| } |
| } |
| |
| return ret; |
| } |
| |
| static int lwis_ioreg_device_probe(struct platform_device *plat_dev) |
| { |
| int ret = 0; |
| struct lwis_ioreg_device *ioreg_dev; |
| struct device *dev = &plat_dev->dev; |
| |
| /* Allocate IOREG device specific data construct */ |
| ioreg_dev = devm_kzalloc(dev, sizeof(struct lwis_ioreg_device), GFP_KERNEL); |
| if (!ioreg_dev) { |
| return -ENOMEM; |
| } |
| |
| ioreg_dev->base_dev.type = DEVICE_TYPE_IOREG; |
| ioreg_dev->base_dev.vops = ioreg_vops; |
| ioreg_dev->base_dev.plat_dev = plat_dev; |
| ioreg_dev->base_dev.k_dev = &plat_dev->dev; |
| |
| /* Call the base device probe function */ |
| ret = lwis_base_probe(&ioreg_dev->base_dev); |
| if (ret) { |
| dev_err(dev, "Error in lwis base probe\n"); |
| return ret; |
| } |
| platform_set_drvdata(plat_dev, &ioreg_dev->base_dev); |
| |
| /* Call IOREG device specific setup function */ |
| ret = lwis_ioreg_device_setup(ioreg_dev); |
| if (ret) { |
| dev_err(ioreg_dev->base_dev.dev, "Error in IOREG device initialization\n"); |
| lwis_base_unprobe(&ioreg_dev->base_dev); |
| return ret; |
| } |
| |
| /* Create associated kworker threads */ |
| ret = lwis_create_kthread_workers(&ioreg_dev->base_dev); |
| if (ret) { |
| dev_err(ioreg_dev->base_dev.dev, "Failed to create lwis_ioreg_kthread"); |
| lwis_base_unprobe(&ioreg_dev->base_dev); |
| return ret; |
| } |
| |
| if (ioreg_dev->base_dev.transaction_thread_priority != 0) { |
| ret = lwis_set_kthread_priority(&ioreg_dev->base_dev, |
| ioreg_dev->base_dev.transaction_worker_thread, |
| ioreg_dev->base_dev.transaction_thread_priority); |
| if (ret) { |
| dev_err(ioreg_dev->base_dev.dev, |
| "Failed to set LWIS IOREG transaction kthread priority (%d)", ret); |
| lwis_base_unprobe(&ioreg_dev->base_dev); |
| return ret; |
| } |
| } |
| |
| dev_info(ioreg_dev->base_dev.dev, "IOREG Device Probe: Success\n"); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM |
| static int lwis_ioreg_device_suspend(struct device *dev) |
| { |
| struct lwis_device *lwis_dev = dev_get_drvdata(dev); |
| |
| if (lwis_dev->enabled != 0) { |
| dev_warn(lwis_dev->dev, "Can't suspend because %s is in use!\n", lwis_dev->name); |
| return -EBUSY; |
| } |
| |
| return 0; |
| } |
| |
| static int lwis_ioreg_device_resume(struct device *dev) |
| { |
| return 0; |
| } |
| |
| static SIMPLE_DEV_PM_OPS(lwis_ioreg_device_ops, lwis_ioreg_device_suspend, |
| lwis_ioreg_device_resume); |
| #endif |
| |
| #ifdef CONFIG_OF |
| static const struct of_device_id lwis_id_match[] = { |
| { .compatible = LWIS_IOREG_DEVICE_COMPAT }, |
| {}, |
| }; |
| // MODULE_DEVICE_TABLE(of, lwis_id_match); |
| |
| static struct platform_driver lwis_driver = { |
| .probe = lwis_ioreg_device_probe, |
| .driver = |
| { |
| .name = LWIS_DRIVER_NAME, |
| .owner = THIS_MODULE, |
| .of_match_table = lwis_id_match, |
| .pm = &lwis_ioreg_device_ops, |
| }, |
| }; |
| #else /* CONFIG_OF not defined */ |
| static struct platform_device_id lwis_driver_id[] = { |
| { |
| .name = LWIS_DRIVER_NAME, |
| .driver_data = 0, |
| }, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(platform, lwis_driver_id); |
| |
| static struct platform_driver lwis_driver = { .probe = lwis_ioreg_device_probe, |
| .id_table = lwis_driver_id, |
| .driver = { |
| .name = LWIS_DRIVER_NAME, |
| .owner = THIS_MODULE, |
| } }; |
| #endif /* CONFIG_OF */ |
| |
| /* |
| * lwis_ioreg_device_init: Init function that will be called by the kernel |
| * initialization routines. |
| */ |
| int __init lwis_ioreg_device_init(void) |
| { |
| int ret = 0; |
| |
| pr_info("IOREG device initialization\n"); |
| |
| ret = platform_driver_register(&lwis_driver); |
| if (ret) { |
| pr_err("platform_driver_register failed: %d\n", ret); |
| } |
| |
| return ret; |
| } |
| |
| int lwis_ioreg_device_deinit(void) |
| { |
| platform_driver_unregister(&lwis_driver); |
| return 0; |
| } |