176 lines
3.5 KiB
C
176 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2016-17 IBM Corp.
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*/
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#define pr_fmt(fmt) "vas: " fmt
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/of_platform.h>
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#include <linux/of_address.h>
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#include <linux/of.h>
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#include <asm/prom.h>
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#include "vas.h"
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DEFINE_MUTEX(vas_mutex);
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static LIST_HEAD(vas_instances);
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static DEFINE_PER_CPU(int, cpu_vas_id);
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static int init_vas_instance(struct platform_device *pdev)
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{
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int rc, cpu, vasid;
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struct resource *res;
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struct vas_instance *vinst;
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struct device_node *dn = pdev->dev.of_node;
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rc = of_property_read_u32(dn, "ibm,vas-id", &vasid);
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if (rc) {
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pr_err("No ibm,vas-id property for %s?\n", pdev->name);
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return -ENODEV;
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}
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if (pdev->num_resources != 4) {
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pr_err("Unexpected DT configuration for [%s, %d]\n",
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pdev->name, vasid);
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return -ENODEV;
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}
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vinst = kzalloc(sizeof(*vinst), GFP_KERNEL);
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if (!vinst)
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return -ENOMEM;
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INIT_LIST_HEAD(&vinst->node);
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ida_init(&vinst->ida);
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mutex_init(&vinst->mutex);
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vinst->vas_id = vasid;
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vinst->pdev = pdev;
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res = &pdev->resource[0];
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vinst->hvwc_bar_start = res->start;
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res = &pdev->resource[1];
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vinst->uwc_bar_start = res->start;
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res = &pdev->resource[2];
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vinst->paste_base_addr = res->start;
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res = &pdev->resource[3];
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if (res->end > 62) {
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pr_err("Bad 'paste_win_id_shift' in DT, %llx\n", res->end);
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goto free_vinst;
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}
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vinst->paste_win_id_shift = 63 - res->end;
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pr_devel("Initialized instance [%s, %d], paste_base 0x%llx, "
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"paste_win_id_shift 0x%llx\n", pdev->name, vasid,
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vinst->paste_base_addr, vinst->paste_win_id_shift);
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for_each_possible_cpu(cpu) {
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if (cpu_to_chip_id(cpu) == of_get_ibm_chip_id(dn))
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per_cpu(cpu_vas_id, cpu) = vasid;
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}
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mutex_lock(&vas_mutex);
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list_add(&vinst->node, &vas_instances);
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mutex_unlock(&vas_mutex);
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vas_instance_init_dbgdir(vinst);
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dev_set_drvdata(&pdev->dev, vinst);
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return 0;
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free_vinst:
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kfree(vinst);
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return -ENODEV;
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}
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/*
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* Although this is read/used multiple times, it is written to only
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* during initialization.
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*/
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struct vas_instance *find_vas_instance(int vasid)
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{
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struct list_head *ent;
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struct vas_instance *vinst;
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mutex_lock(&vas_mutex);
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if (vasid == -1)
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vasid = per_cpu(cpu_vas_id, smp_processor_id());
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list_for_each(ent, &vas_instances) {
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vinst = list_entry(ent, struct vas_instance, node);
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if (vinst->vas_id == vasid) {
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mutex_unlock(&vas_mutex);
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return vinst;
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}
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}
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mutex_unlock(&vas_mutex);
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pr_devel("Instance %d not found\n", vasid);
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return NULL;
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}
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int chip_to_vas_id(int chipid)
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{
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int cpu;
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for_each_possible_cpu(cpu) {
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if (cpu_to_chip_id(cpu) == chipid)
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return per_cpu(cpu_vas_id, cpu);
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}
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return -1;
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}
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EXPORT_SYMBOL(chip_to_vas_id);
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static int vas_probe(struct platform_device *pdev)
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{
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return init_vas_instance(pdev);
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}
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static const struct of_device_id powernv_vas_match[] = {
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{ .compatible = "ibm,vas",},
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{},
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};
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static struct platform_driver vas_driver = {
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.driver = {
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.name = "vas",
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.of_match_table = powernv_vas_match,
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},
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.probe = vas_probe,
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};
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static int __init vas_init(void)
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{
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int found = 0;
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struct device_node *dn;
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platform_driver_register(&vas_driver);
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for_each_compatible_node(dn, NULL, "ibm,vas") {
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of_platform_device_create(dn, NULL, NULL);
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found++;
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}
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if (!found) {
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platform_driver_unregister(&vas_driver);
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return -ENODEV;
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}
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pr_devel("Found %d instances\n", found);
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return 0;
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}
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device_initcall(vas_init);
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