2 * Copyright 2016-17 IBM Corp.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
10 #define pr_fmt(fmt) "vas: " fmt
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/export.h>
15 #include <linux/types.h>
16 #include <linux/slab.h>
17 #include <linux/platform_device.h>
18 #include <linux/of_platform.h>
19 #include <linux/of_address.h>
24 static DEFINE_MUTEX(vas_mutex);
25 static LIST_HEAD(vas_instances);
27 static int init_vas_instance(struct platform_device *pdev)
31 struct vas_instance *vinst;
32 struct device_node *dn = pdev->dev.of_node;
34 rc = of_property_read_u32(dn, "ibm,vas-id", &vasid);
36 pr_err("No ibm,vas-id property for %s?\n", pdev->name);
40 if (pdev->num_resources != 4) {
41 pr_err("Unexpected DT configuration for [%s, %d]\n",
46 vinst = kzalloc(sizeof(*vinst), GFP_KERNEL);
50 INIT_LIST_HEAD(&vinst->node);
51 ida_init(&vinst->ida);
52 mutex_init(&vinst->mutex);
53 vinst->vas_id = vasid;
56 res = &pdev->resource[0];
57 vinst->hvwc_bar_start = res->start;
59 res = &pdev->resource[1];
60 vinst->uwc_bar_start = res->start;
62 res = &pdev->resource[2];
63 vinst->paste_base_addr = res->start;
65 res = &pdev->resource[3];
67 pr_err("Bad 'paste_win_id_shift' in DT, %llx\n", res->end);
71 vinst->paste_win_id_shift = 63 - res->end;
73 pr_devel("Initialized instance [%s, %d], paste_base 0x%llx, "
74 "paste_win_id_shift 0x%llx\n", pdev->name, vasid,
75 vinst->paste_base_addr, vinst->paste_win_id_shift);
77 mutex_lock(&vas_mutex);
78 list_add(&vinst->node, &vas_instances);
79 mutex_unlock(&vas_mutex);
81 dev_set_drvdata(&pdev->dev, vinst);
92 * Although this is read/used multiple times, it is written to only
93 * during initialization.
95 struct vas_instance *find_vas_instance(int vasid)
97 struct list_head *ent;
98 struct vas_instance *vinst;
100 mutex_lock(&vas_mutex);
101 list_for_each(ent, &vas_instances) {
102 vinst = list_entry(ent, struct vas_instance, node);
103 if (vinst->vas_id == vasid) {
104 mutex_unlock(&vas_mutex);
108 mutex_unlock(&vas_mutex);
110 pr_devel("Instance %d not found\n", vasid);
114 static int vas_probe(struct platform_device *pdev)
116 return init_vas_instance(pdev);
119 static const struct of_device_id powernv_vas_match[] = {
120 { .compatible = "ibm,vas",},
124 static struct platform_driver vas_driver = {
127 .of_match_table = powernv_vas_match,
132 static int __init vas_init(void)
135 struct device_node *dn;
137 platform_driver_register(&vas_driver);
139 for_each_compatible_node(dn, NULL, "ibm,vas") {
140 of_platform_device_create(dn, NULL, NULL);
147 pr_devel("Found %d instances\n", found);
151 device_initcall(vas_init);