// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2018, Intel Corporation * Copied from reset-sunxi.c */ #include <linux/err.h> #include <linux/io.h> #include <linux/init.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/platform_device.h> #include <linux/reset-controller.h> #include <linux/reset/socfpga.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/types.h> #include "reset-simple.h" #define SOCFPGA_NR_BANKS 8 static int a10_reset_init(struct device_node *np) { struct reset_simple_data *data; struct resource res; resource_size_t size; int ret; u32 reg_offset = 0x10; data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; ret = of_address_to_resource(np, 0, &res); if (ret) goto err_alloc; size = resource_size(&res); if (!request_mem_region(res.start, size, np->name)) { ret = -EBUSY; goto err_alloc; } data->membase = ioremap(res.start, size); if (!data->membase) { ret = -ENOMEM; goto err_alloc; } if (of_property_read_u32(np, "altr,modrst-offset", ®_offset)) pr_warn("missing altr,modrst-offset property, assuming 0x10\n"); data->membase += reg_offset; spin_lock_init(&data->lock); data->rcdev.owner = THIS_MODULE; data->rcdev.nr_resets = SOCFPGA_NR_BANKS * 32; data->rcdev.ops = &reset_simple_ops; data->rcdev.of_node = np; data->status_active_low = true; return reset_controller_register(&data->rcdev); err_alloc: kfree(data); return ret; }; /* * These are the reset controller we need to initialize early on in * our system, before we can even think of using a regular device * driver for it. * The controllers that we can register through the regular device * model are handled by the simple reset driver directly. */ static const struct of_device_id socfpga_early_reset_dt_ids[] __initconst = { { .compatible = "altr,rst-mgr", }, { /* sentinel */ }, }; void __init socfpga_reset_init(void) { struct device_node *np; for_each_matching_node(np, socfpga_early_reset_dt_ids) a10_reset_init(np); }