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11
12#define pr_fmt(fmt) "ipmi-powernv: " fmt
13
14#include <linux/ipmi_smi.h>
15#include <linux/list.h>
16#include <linux/module.h>
17#include <linux/of.h>
18#include <linux/of_irq.h>
19#include <linux/interrupt.h>
20
21#include <asm/opal.h>
22
23
24struct ipmi_smi_powernv {
25 u64 interface_id;
26 struct ipmi_device_id ipmi_id;
27 ipmi_smi_t intf;
28 unsigned int irq;
29
30
31
32
33
34
35
36 spinlock_t msg_lock;
37 struct ipmi_smi_msg *cur_msg;
38 struct opal_ipmi_msg *opal_msg;
39};
40
41static int ipmi_powernv_start_processing(void *send_info, ipmi_smi_t intf)
42{
43 struct ipmi_smi_powernv *smi = send_info;
44
45 smi->intf = intf;
46 return 0;
47}
48
49static void send_error_reply(struct ipmi_smi_powernv *smi,
50 struct ipmi_smi_msg *msg, u8 completion_code)
51{
52 msg->rsp[0] = msg->data[0] | 0x4;
53 msg->rsp[1] = msg->data[1];
54 msg->rsp[2] = completion_code;
55 msg->rsp_size = 3;
56 ipmi_smi_msg_received(smi->intf, msg);
57}
58
59static void ipmi_powernv_send(void *send_info, struct ipmi_smi_msg *msg)
60{
61 struct ipmi_smi_powernv *smi = send_info;
62 struct opal_ipmi_msg *opal_msg;
63 unsigned long flags;
64 int comp, rc;
65 size_t size;
66
67
68 if (msg->data_size > IPMI_MAX_MSG_LENGTH) {
69 comp = IPMI_REQ_LEN_EXCEEDED_ERR;
70 goto err;
71 }
72
73
74 if (msg->data_size < 2) {
75 comp = IPMI_REQ_LEN_INVALID_ERR;
76 goto err;
77 }
78
79 spin_lock_irqsave(&smi->msg_lock, flags);
80
81 if (smi->cur_msg) {
82 comp = IPMI_NODE_BUSY_ERR;
83 goto err_unlock;
84 }
85
86
87 opal_msg = smi->opal_msg;
88 opal_msg->version = OPAL_IPMI_MSG_FORMAT_VERSION_1;
89 opal_msg->netfn = msg->data[0];
90 opal_msg->cmd = msg->data[1];
91 if (msg->data_size > 2)
92 memcpy(opal_msg->data, msg->data + 2, msg->data_size - 2);
93
94
95 size = sizeof(*opal_msg) + msg->data_size - 2;
96
97 pr_devel("%s: opal_ipmi_send(0x%llx, %p, %ld)\n", __func__,
98 smi->interface_id, opal_msg, size);
99 rc = opal_ipmi_send(smi->interface_id, opal_msg, size);
100 pr_devel("%s: -> %d\n", __func__, rc);
101
102 if (!rc) {
103 smi->cur_msg = msg;
104 spin_unlock_irqrestore(&smi->msg_lock, flags);
105 return;
106 }
107
108 comp = IPMI_ERR_UNSPECIFIED;
109err_unlock:
110 spin_unlock_irqrestore(&smi->msg_lock, flags);
111err:
112 send_error_reply(smi, msg, comp);
113}
114
115static int ipmi_powernv_recv(struct ipmi_smi_powernv *smi)
116{
117 struct opal_ipmi_msg *opal_msg;
118 struct ipmi_smi_msg *msg;
119 unsigned long flags;
120 uint64_t size;
121 int rc;
122
123 pr_devel("%s: opal_ipmi_recv(%llx, msg, sz)\n", __func__,
124 smi->interface_id);
125
126 spin_lock_irqsave(&smi->msg_lock, flags);
127
128 if (!smi->cur_msg) {
129 spin_unlock_irqrestore(&smi->msg_lock, flags);
130 pr_warn("no current message?\n");
131 return 0;
132 }
133
134 msg = smi->cur_msg;
135 opal_msg = smi->opal_msg;
136
137 size = cpu_to_be64(sizeof(*opal_msg) + IPMI_MAX_MSG_LENGTH);
138
139 rc = opal_ipmi_recv(smi->interface_id,
140 opal_msg,
141 &size);
142 size = be64_to_cpu(size);
143 pr_devel("%s: -> %d (size %lld)\n", __func__,
144 rc, rc == 0 ? size : 0);
145 if (rc) {
146
147 if (rc == OPAL_EMPTY) {
148 spin_unlock_irqrestore(&smi->msg_lock, flags);
149 return 0;
150 }
151
152 smi->cur_msg = NULL;
153 spin_unlock_irqrestore(&smi->msg_lock, flags);
154 send_error_reply(smi, msg, IPMI_ERR_UNSPECIFIED);
155 return 0;
156 }
157
158 if (size < sizeof(*opal_msg)) {
159 spin_unlock_irqrestore(&smi->msg_lock, flags);
160 pr_warn("unexpected IPMI message size %lld\n", size);
161 return 0;
162 }
163
164 if (opal_msg->version != OPAL_IPMI_MSG_FORMAT_VERSION_1) {
165 spin_unlock_irqrestore(&smi->msg_lock, flags);
166 pr_warn("unexpected IPMI message format (version %d)\n",
167 opal_msg->version);
168 return 0;
169 }
170
171 msg->rsp[0] = opal_msg->netfn;
172 msg->rsp[1] = opal_msg->cmd;
173 if (size > sizeof(*opal_msg))
174 memcpy(&msg->rsp[2], opal_msg->data, size - sizeof(*opal_msg));
175 msg->rsp_size = 2 + size - sizeof(*opal_msg);
176
177 smi->cur_msg = NULL;
178 spin_unlock_irqrestore(&smi->msg_lock, flags);
179 ipmi_smi_msg_received(smi->intf, msg);
180 return 0;
181}
182
183static void ipmi_powernv_request_events(void *send_info)
184{
185}
186
187static void ipmi_powernv_set_run_to_completion(void *send_info,
188 bool run_to_completion)
189{
190}
191
192static void ipmi_powernv_poll(void *send_info)
193{
194 struct ipmi_smi_powernv *smi = send_info;
195
196 ipmi_powernv_recv(smi);
197}
198
199static const struct ipmi_smi_handlers ipmi_powernv_smi_handlers = {
200 .owner = THIS_MODULE,
201 .start_processing = ipmi_powernv_start_processing,
202 .sender = ipmi_powernv_send,
203 .request_events = ipmi_powernv_request_events,
204 .set_run_to_completion = ipmi_powernv_set_run_to_completion,
205 .poll = ipmi_powernv_poll,
206};
207
208static irqreturn_t ipmi_opal_event(int irq, void *data)
209{
210 struct ipmi_smi_powernv *smi = data;
211
212 ipmi_powernv_recv(smi);
213 return IRQ_HANDLED;
214}
215
216static int ipmi_powernv_probe(struct platform_device *pdev)
217{
218 struct ipmi_smi_powernv *ipmi;
219 struct device *dev;
220 u32 prop;
221 int rc;
222
223 if (!pdev || !pdev->dev.of_node)
224 return -ENODEV;
225
226 dev = &pdev->dev;
227
228 ipmi = devm_kzalloc(dev, sizeof(*ipmi), GFP_KERNEL);
229 if (!ipmi)
230 return -ENOMEM;
231
232 spin_lock_init(&ipmi->msg_lock);
233
234 rc = of_property_read_u32(dev->of_node, "ibm,ipmi-interface-id",
235 &prop);
236 if (rc) {
237 dev_warn(dev, "No interface ID property\n");
238 goto err_free;
239 }
240 ipmi->interface_id = prop;
241
242 rc = of_property_read_u32(dev->of_node, "interrupts", &prop);
243 if (rc) {
244 dev_warn(dev, "No interrupts property\n");
245 goto err_free;
246 }
247
248 ipmi->irq = irq_of_parse_and_map(dev->of_node, 0);
249 if (!ipmi->irq) {
250 dev_info(dev, "Unable to map irq from device tree\n");
251 ipmi->irq = opal_event_request(prop);
252 }
253
254 if (request_irq(ipmi->irq, ipmi_opal_event, IRQ_TYPE_LEVEL_HIGH,
255 "opal-ipmi", ipmi)) {
256 dev_warn(dev, "Unable to request irq\n");
257 goto err_dispose;
258 }
259
260 ipmi->opal_msg = devm_kmalloc(dev,
261 sizeof(*ipmi->opal_msg) + IPMI_MAX_MSG_LENGTH,
262 GFP_KERNEL);
263 if (!ipmi->opal_msg) {
264 rc = -ENOMEM;
265 goto err_unregister;
266 }
267
268
269 rc = ipmi_register_smi(&ipmi_powernv_smi_handlers, ipmi,
270 &ipmi->ipmi_id, dev, 0);
271 if (rc) {
272 dev_warn(dev, "IPMI SMI registration failed (%d)\n", rc);
273 goto err_free_msg;
274 }
275
276 dev_set_drvdata(dev, ipmi);
277 return 0;
278
279err_free_msg:
280 devm_kfree(dev, ipmi->opal_msg);
281err_unregister:
282 free_irq(ipmi->irq, ipmi);
283err_dispose:
284 irq_dispose_mapping(ipmi->irq);
285err_free:
286 devm_kfree(dev, ipmi);
287 return rc;
288}
289
290static int ipmi_powernv_remove(struct platform_device *pdev)
291{
292 struct ipmi_smi_powernv *smi = dev_get_drvdata(&pdev->dev);
293
294 ipmi_unregister_smi(smi->intf);
295 free_irq(smi->irq, smi);
296 irq_dispose_mapping(smi->irq);
297
298 return 0;
299}
300
301static const struct of_device_id ipmi_powernv_match[] = {
302 { .compatible = "ibm,opal-ipmi" },
303 { },
304};
305
306
307static struct platform_driver powernv_ipmi_driver = {
308 .driver = {
309 .name = "ipmi-powernv",
310 .of_match_table = ipmi_powernv_match,
311 },
312 .probe = ipmi_powernv_probe,
313 .remove = ipmi_powernv_remove,
314};
315
316
317module_platform_driver(powernv_ipmi_driver);
318
319MODULE_DEVICE_TABLE(of, ipmi_powernv_match);
320MODULE_DESCRIPTION("powernv IPMI driver");
321MODULE_AUTHOR("Jeremy Kerr <jk@ozlabs.org>");
322MODULE_LICENSE("GPL");
323
