This source file includes following definitions.
- init_vas_instance
- find_vas_instance
- chip_to_vas_id
- vas_probe
- vas_init
1
2
3
4
5
6 #define pr_fmt(fmt) "vas: " fmt
7
8 #include <linux/module.h>
9 #include <linux/kernel.h>
10 #include <linux/export.h>
11 #include <linux/types.h>
12 #include <linux/slab.h>
13 #include <linux/platform_device.h>
14 #include <linux/of_platform.h>
15 #include <linux/of_address.h>
16 #include <linux/of.h>
17 #include <asm/prom.h>
18
19 #include "vas.h"
20
21 DEFINE_MUTEX(vas_mutex);
22 static LIST_HEAD(vas_instances);
23
24 static DEFINE_PER_CPU(int, cpu_vas_id);
25
26 static int init_vas_instance(struct platform_device *pdev)
27 {
28 int rc, cpu, vasid;
29 struct resource *res;
30 struct vas_instance *vinst;
31 struct device_node *dn = pdev->dev.of_node;
32
33 rc = of_property_read_u32(dn, "ibm,vas-id", &vasid);
34 if (rc) {
35 pr_err("No ibm,vas-id property for %s?\n", pdev->name);
36 return -ENODEV;
37 }
38
39 if (pdev->num_resources != 4) {
40 pr_err("Unexpected DT configuration for [%s, %d]\n",
41 pdev->name, vasid);
42 return -ENODEV;
43 }
44
45 vinst = kzalloc(sizeof(*vinst), GFP_KERNEL);
46 if (!vinst)
47 return -ENOMEM;
48
49 INIT_LIST_HEAD(&vinst->node);
50 ida_init(&vinst->ida);
51 mutex_init(&vinst->mutex);
52 vinst->vas_id = vasid;
53 vinst->pdev = pdev;
54
55 res = &pdev->resource[0];
56 vinst->hvwc_bar_start = res->start;
57
58 res = &pdev->resource[1];
59 vinst->uwc_bar_start = res->start;
60
61 res = &pdev->resource[2];
62 vinst->paste_base_addr = res->start;
63
64 res = &pdev->resource[3];
65 if (res->end > 62) {
66 pr_err("Bad 'paste_win_id_shift' in DT, %llx\n", res->end);
67 goto free_vinst;
68 }
69
70 vinst->paste_win_id_shift = 63 - res->end;
71
72 pr_devel("Initialized instance [%s, %d], paste_base 0x%llx, "
73 "paste_win_id_shift 0x%llx\n", pdev->name, vasid,
74 vinst->paste_base_addr, vinst->paste_win_id_shift);
75
76 for_each_possible_cpu(cpu) {
77 if (cpu_to_chip_id(cpu) == of_get_ibm_chip_id(dn))
78 per_cpu(cpu_vas_id, cpu) = vasid;
79 }
80
81 mutex_lock(&vas_mutex);
82 list_add(&vinst->node, &vas_instances);
83 mutex_unlock(&vas_mutex);
84
85 vas_instance_init_dbgdir(vinst);
86
87 dev_set_drvdata(&pdev->dev, vinst);
88
89 return 0;
90
91 free_vinst:
92 kfree(vinst);
93 return -ENODEV;
94
95 }
96
97
98
99
100
101 struct vas_instance *find_vas_instance(int vasid)
102 {
103 struct list_head *ent;
104 struct vas_instance *vinst;
105
106 mutex_lock(&vas_mutex);
107
108 if (vasid == -1)
109 vasid = per_cpu(cpu_vas_id, smp_processor_id());
110
111 list_for_each(ent, &vas_instances) {
112 vinst = list_entry(ent, struct vas_instance, node);
113 if (vinst->vas_id == vasid) {
114 mutex_unlock(&vas_mutex);
115 return vinst;
116 }
117 }
118 mutex_unlock(&vas_mutex);
119
120 pr_devel("Instance %d not found\n", vasid);
121 return NULL;
122 }
123
124 int chip_to_vas_id(int chipid)
125 {
126 int cpu;
127
128 for_each_possible_cpu(cpu) {
129 if (cpu_to_chip_id(cpu) == chipid)
130 return per_cpu(cpu_vas_id, cpu);
131 }
132 return -1;
133 }
134 EXPORT_SYMBOL(chip_to_vas_id);
135
136 static int vas_probe(struct platform_device *pdev)
137 {
138 return init_vas_instance(pdev);
139 }
140
141 static const struct of_device_id powernv_vas_match[] = {
142 { .compatible = "ibm,vas",},
143 {},
144 };
145
146 static struct platform_driver vas_driver = {
147 .driver = {
148 .name = "vas",
149 .of_match_table = powernv_vas_match,
150 },
151 .probe = vas_probe,
152 };
153
154 static int __init vas_init(void)
155 {
156 int found = 0;
157 struct device_node *dn;
158
159 platform_driver_register(&vas_driver);
160
161 for_each_compatible_node(dn, NULL, "ibm,vas") {
162 of_platform_device_create(dn, NULL, NULL);
163 found++;
164 }
165
166 if (!found) {
167 platform_driver_unregister(&vas_driver);
168 return -ENODEV;
169 }
170
171 pr_devel("Found %d instances\n", found);
172
173 return 0;
174 }
175 device_initcall(vas_init);