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1// SPDX-License-Identifier: GPL-2.0+2/*3 * PowerNV OPAL IPMI driver4 *5 * Copyright 2014 IBM Corp.6 */7 8#define pr_fmt(fmt) "ipmi-powernv: " fmt9 10#include <linux/ipmi_smi.h>11#include <linux/list.h>12#include <linux/module.h>13#include <linux/of.h>14#include <linux/of_irq.h>15#include <linux/interrupt.h>16 17#include <asm/opal.h>18 19 20struct ipmi_smi_powernv {21 u64 interface_id;22 struct ipmi_smi *intf;23 unsigned int irq;24 25 /**26 * We assume that there can only be one outstanding request, so27 * keep the pending message in cur_msg. We protect this from concurrent28 * updates through send & recv calls, (and consequently opal_msg, which29 * is in-use when cur_msg is set) with msg_lock30 */31 spinlock_t msg_lock;32 struct ipmi_smi_msg *cur_msg;33 struct opal_ipmi_msg *opal_msg;34};35 36static int ipmi_powernv_start_processing(void *send_info, struct ipmi_smi *intf)37{38 struct ipmi_smi_powernv *smi = send_info;39 40 smi->intf = intf;41 return 0;42}43 44static void send_error_reply(struct ipmi_smi_powernv *smi,45 struct ipmi_smi_msg *msg, u8 completion_code)46{47 msg->rsp[0] = msg->data[0] | 0x4;48 msg->rsp[1] = msg->data[1];49 msg->rsp[2] = completion_code;50 msg->rsp_size = 3;51 ipmi_smi_msg_received(smi->intf, msg);52}53 54static void ipmi_powernv_send(void *send_info, struct ipmi_smi_msg *msg)55{56 struct ipmi_smi_powernv *smi = send_info;57 struct opal_ipmi_msg *opal_msg;58 unsigned long flags;59 int comp, rc;60 size_t size;61 62 /* ensure data_len will fit in the opal_ipmi_msg buffer... */63 if (msg->data_size > IPMI_MAX_MSG_LENGTH) {64 comp = IPMI_REQ_LEN_EXCEEDED_ERR;65 goto err;66 }67 68 /* ... and that we at least have netfn and cmd bytes */69 if (msg->data_size < 2) {70 comp = IPMI_REQ_LEN_INVALID_ERR;71 goto err;72 }73 74 spin_lock_irqsave(&smi->msg_lock, flags);75 76 if (smi->cur_msg) {77 comp = IPMI_NODE_BUSY_ERR;78 goto err_unlock;79 }80 81 /* format our data for the OPAL API */82 opal_msg = smi->opal_msg;83 opal_msg->version = OPAL_IPMI_MSG_FORMAT_VERSION_1;84 opal_msg->netfn = msg->data[0];85 opal_msg->cmd = msg->data[1];86 if (msg->data_size > 2)87 memcpy(opal_msg->data, msg->data + 2, msg->data_size - 2);88 89 /* data_size already includes the netfn and cmd bytes */90 size = sizeof(*opal_msg) + msg->data_size - 2;91 92 pr_devel("%s: opal_ipmi_send(0x%llx, %p, %ld)\n", __func__,93 smi->interface_id, opal_msg, size);94 rc = opal_ipmi_send(smi->interface_id, opal_msg, size);95 pr_devel("%s: -> %d\n", __func__, rc);96 97 if (!rc) {98 smi->cur_msg = msg;99 spin_unlock_irqrestore(&smi->msg_lock, flags);100 return;101 }102 103 comp = IPMI_ERR_UNSPECIFIED;104err_unlock:105 spin_unlock_irqrestore(&smi->msg_lock, flags);106err:107 send_error_reply(smi, msg, comp);108}109 110static int ipmi_powernv_recv(struct ipmi_smi_powernv *smi)111{112 struct opal_ipmi_msg *opal_msg;113 struct ipmi_smi_msg *msg;114 unsigned long flags;115 uint64_t size;116 int rc;117 118 pr_devel("%s: opal_ipmi_recv(%llx, msg, sz)\n", __func__,119 smi->interface_id);120 121 spin_lock_irqsave(&smi->msg_lock, flags);122 123 if (!smi->cur_msg) {124 spin_unlock_irqrestore(&smi->msg_lock, flags);125 pr_warn("no current message?\n");126 return 0;127 }128 129 msg = smi->cur_msg;130 opal_msg = smi->opal_msg;131 132 size = cpu_to_be64(sizeof(*opal_msg) + IPMI_MAX_MSG_LENGTH);133 134 rc = opal_ipmi_recv(smi->interface_id,135 opal_msg,136 &size);137 size = be64_to_cpu(size);138 pr_devel("%s: -> %d (size %lld)\n", __func__,139 rc, rc == 0 ? size : 0);140 if (rc) {141 /* If came via the poll, and response was not yet ready */142 if (rc == OPAL_EMPTY) {143 spin_unlock_irqrestore(&smi->msg_lock, flags);144 return 0;145 }146 147 smi->cur_msg = NULL;148 spin_unlock_irqrestore(&smi->msg_lock, flags);149 send_error_reply(smi, msg, IPMI_ERR_UNSPECIFIED);150 return 0;151 }152 153 if (size < sizeof(*opal_msg)) {154 spin_unlock_irqrestore(&smi->msg_lock, flags);155 pr_warn("unexpected IPMI message size %lld\n", size);156 return 0;157 }158 159 if (opal_msg->version != OPAL_IPMI_MSG_FORMAT_VERSION_1) {160 spin_unlock_irqrestore(&smi->msg_lock, flags);161 pr_warn("unexpected IPMI message format (version %d)\n",162 opal_msg->version);163 return 0;164 }165 166 msg->rsp[0] = opal_msg->netfn;167 msg->rsp[1] = opal_msg->cmd;168 if (size > sizeof(*opal_msg))169 memcpy(&msg->rsp[2], opal_msg->data, size - sizeof(*opal_msg));170 msg->rsp_size = 2 + size - sizeof(*opal_msg);171 172 smi->cur_msg = NULL;173 spin_unlock_irqrestore(&smi->msg_lock, flags);174 ipmi_smi_msg_received(smi->intf, msg);175 return 0;176}177 178static void ipmi_powernv_request_events(void *send_info)179{180}181 182static void ipmi_powernv_set_run_to_completion(void *send_info,183 bool run_to_completion)184{185}186 187static void ipmi_powernv_poll(void *send_info)188{189 struct ipmi_smi_powernv *smi = send_info;190 191 ipmi_powernv_recv(smi);192}193 194static const struct ipmi_smi_handlers ipmi_powernv_smi_handlers = {195 .owner = THIS_MODULE,196 .start_processing = ipmi_powernv_start_processing,197 .sender = ipmi_powernv_send,198 .request_events = ipmi_powernv_request_events,199 .set_run_to_completion = ipmi_powernv_set_run_to_completion,200 .poll = ipmi_powernv_poll,201};202 203static irqreturn_t ipmi_opal_event(int irq, void *data)204{205 struct ipmi_smi_powernv *smi = data;206 207 ipmi_powernv_recv(smi);208 return IRQ_HANDLED;209}210 211static int ipmi_powernv_probe(struct platform_device *pdev)212{213 struct ipmi_smi_powernv *ipmi;214 struct device *dev;215 u32 prop;216 int rc;217 218 if (!pdev || !pdev->dev.of_node)219 return -ENODEV;220 221 dev = &pdev->dev;222 223 ipmi = devm_kzalloc(dev, sizeof(*ipmi), GFP_KERNEL);224 if (!ipmi)225 return -ENOMEM;226 227 spin_lock_init(&ipmi->msg_lock);228 229 rc = of_property_read_u32(dev->of_node, "ibm,ipmi-interface-id",230 &prop);231 if (rc) {232 dev_warn(dev, "No interface ID property\n");233 goto err_free;234 }235 ipmi->interface_id = prop;236 237 rc = of_property_read_u32(dev->of_node, "interrupts", &prop);238 if (rc) {239 dev_warn(dev, "No interrupts property\n");240 goto err_free;241 }242 243 ipmi->irq = irq_of_parse_and_map(dev->of_node, 0);244 if (!ipmi->irq) {245 dev_info(dev, "Unable to map irq from device tree\n");246 ipmi->irq = opal_event_request(prop);247 }248 249 rc = request_irq(ipmi->irq, ipmi_opal_event, IRQ_TYPE_LEVEL_HIGH,250 "opal-ipmi", ipmi);251 if (rc) {252 dev_warn(dev, "Unable to request irq\n");253 goto err_dispose;254 }255 256 ipmi->opal_msg = devm_kmalloc(dev,257 sizeof(*ipmi->opal_msg) + IPMI_MAX_MSG_LENGTH,258 GFP_KERNEL);259 if (!ipmi->opal_msg) {260 rc = -ENOMEM;261 goto err_unregister;262 }263 264 rc = ipmi_register_smi(&ipmi_powernv_smi_handlers, ipmi, dev, 0);265 if (rc) {266 dev_warn(dev, "IPMI SMI registration failed (%d)\n", rc);267 goto err_free_msg;268 }269 270 dev_set_drvdata(dev, ipmi);271 return 0;272 273err_free_msg:274 devm_kfree(dev, ipmi->opal_msg);275err_unregister:276 free_irq(ipmi->irq, ipmi);277err_dispose:278 irq_dispose_mapping(ipmi->irq);279err_free:280 devm_kfree(dev, ipmi);281 return rc;282}283 284static void ipmi_powernv_remove(struct platform_device *pdev)285{286 struct ipmi_smi_powernv *smi = dev_get_drvdata(&pdev->dev);287 288 ipmi_unregister_smi(smi->intf);289 free_irq(smi->irq, smi);290 irq_dispose_mapping(smi->irq);291}292 293static const struct of_device_id ipmi_powernv_match[] = {294 { .compatible = "ibm,opal-ipmi" },295 { },296};297 298 299static struct platform_driver powernv_ipmi_driver = {300 .driver = {301 .name = "ipmi-powernv",302 .of_match_table = ipmi_powernv_match,303 },304 .probe = ipmi_powernv_probe,305 .remove_new = ipmi_powernv_remove,306};307 308 309module_platform_driver(powernv_ipmi_driver);310 311MODULE_DEVICE_TABLE(of, ipmi_powernv_match);312MODULE_DESCRIPTION("powernv IPMI driver");313MODULE_AUTHOR("Jeremy Kerr <jk@ozlabs.org>");314MODULE_LICENSE("GPL");315