1243ac210SCorey Minyard // SPDX-License-Identifier: GPL-2.0+
26a11e5c6SJeremy Kerr /*
36a11e5c6SJeremy Kerr * PowerNV OPAL IPMI driver
46a11e5c6SJeremy Kerr *
56a11e5c6SJeremy Kerr * Copyright 2014 IBM Corp.
66a11e5c6SJeremy Kerr */
76a11e5c6SJeremy Kerr
86a11e5c6SJeremy Kerr #define pr_fmt(fmt) "ipmi-powernv: " fmt
96a11e5c6SJeremy Kerr
106a11e5c6SJeremy Kerr #include <linux/ipmi_smi.h>
116a11e5c6SJeremy Kerr #include <linux/list.h>
126a11e5c6SJeremy Kerr #include <linux/module.h>
136a11e5c6SJeremy Kerr #include <linux/of.h>
14dce143c3SAlistair Popple #include <linux/of_irq.h>
15dce143c3SAlistair Popple #include <linux/interrupt.h>
166a11e5c6SJeremy Kerr
176a11e5c6SJeremy Kerr #include <asm/opal.h>
186a11e5c6SJeremy Kerr
196a11e5c6SJeremy Kerr
206a11e5c6SJeremy Kerr struct ipmi_smi_powernv {
216a11e5c6SJeremy Kerr u64 interface_id;
224a758c92SCorey Minyard struct ipmi_smi *intf;
23dce143c3SAlistair Popple unsigned int irq;
246a11e5c6SJeremy Kerr
256a11e5c6SJeremy Kerr /**
266a11e5c6SJeremy Kerr * We assume that there can only be one outstanding request, so
276a11e5c6SJeremy Kerr * keep the pending message in cur_msg. We protect this from concurrent
286a11e5c6SJeremy Kerr * updates through send & recv calls, (and consequently opal_msg, which
296a11e5c6SJeremy Kerr * is in-use when cur_msg is set) with msg_lock
306a11e5c6SJeremy Kerr */
316a11e5c6SJeremy Kerr spinlock_t msg_lock;
326a11e5c6SJeremy Kerr struct ipmi_smi_msg *cur_msg;
336a11e5c6SJeremy Kerr struct opal_ipmi_msg *opal_msg;
346a11e5c6SJeremy Kerr };
356a11e5c6SJeremy Kerr
ipmi_powernv_start_processing(void * send_info,struct ipmi_smi * intf)364a758c92SCorey Minyard static int ipmi_powernv_start_processing(void *send_info, struct ipmi_smi *intf)
376a11e5c6SJeremy Kerr {
386a11e5c6SJeremy Kerr struct ipmi_smi_powernv *smi = send_info;
396a11e5c6SJeremy Kerr
406a11e5c6SJeremy Kerr smi->intf = intf;
416a11e5c6SJeremy Kerr return 0;
426a11e5c6SJeremy Kerr }
436a11e5c6SJeremy Kerr
send_error_reply(struct ipmi_smi_powernv * smi,struct ipmi_smi_msg * msg,u8 completion_code)446a11e5c6SJeremy Kerr static void send_error_reply(struct ipmi_smi_powernv *smi,
456a11e5c6SJeremy Kerr struct ipmi_smi_msg *msg, u8 completion_code)
466a11e5c6SJeremy Kerr {
476a11e5c6SJeremy Kerr msg->rsp[0] = msg->data[0] | 0x4;
486a11e5c6SJeremy Kerr msg->rsp[1] = msg->data[1];
496a11e5c6SJeremy Kerr msg->rsp[2] = completion_code;
506a11e5c6SJeremy Kerr msg->rsp_size = 3;
516a11e5c6SJeremy Kerr ipmi_smi_msg_received(smi->intf, msg);
526a11e5c6SJeremy Kerr }
536a11e5c6SJeremy Kerr
ipmi_powernv_send(void * send_info,struct ipmi_smi_msg * msg)546a11e5c6SJeremy Kerr static void ipmi_powernv_send(void *send_info, struct ipmi_smi_msg *msg)
556a11e5c6SJeremy Kerr {
566a11e5c6SJeremy Kerr struct ipmi_smi_powernv *smi = send_info;
576a11e5c6SJeremy Kerr struct opal_ipmi_msg *opal_msg;
586a11e5c6SJeremy Kerr unsigned long flags;
596a11e5c6SJeremy Kerr int comp, rc;
606a11e5c6SJeremy Kerr size_t size;
616a11e5c6SJeremy Kerr
626a11e5c6SJeremy Kerr /* ensure data_len will fit in the opal_ipmi_msg buffer... */
636a11e5c6SJeremy Kerr if (msg->data_size > IPMI_MAX_MSG_LENGTH) {
646a11e5c6SJeremy Kerr comp = IPMI_REQ_LEN_EXCEEDED_ERR;
656a11e5c6SJeremy Kerr goto err;
666a11e5c6SJeremy Kerr }
676a11e5c6SJeremy Kerr
686a11e5c6SJeremy Kerr /* ... and that we at least have netfn and cmd bytes */
696a11e5c6SJeremy Kerr if (msg->data_size < 2) {
706a11e5c6SJeremy Kerr comp = IPMI_REQ_LEN_INVALID_ERR;
716a11e5c6SJeremy Kerr goto err;
726a11e5c6SJeremy Kerr }
736a11e5c6SJeremy Kerr
746a11e5c6SJeremy Kerr spin_lock_irqsave(&smi->msg_lock, flags);
756a11e5c6SJeremy Kerr
766a11e5c6SJeremy Kerr if (smi->cur_msg) {
776a11e5c6SJeremy Kerr comp = IPMI_NODE_BUSY_ERR;
786a11e5c6SJeremy Kerr goto err_unlock;
796a11e5c6SJeremy Kerr }
806a11e5c6SJeremy Kerr
816a11e5c6SJeremy Kerr /* format our data for the OPAL API */
826a11e5c6SJeremy Kerr opal_msg = smi->opal_msg;
836a11e5c6SJeremy Kerr opal_msg->version = OPAL_IPMI_MSG_FORMAT_VERSION_1;
846a11e5c6SJeremy Kerr opal_msg->netfn = msg->data[0];
856a11e5c6SJeremy Kerr opal_msg->cmd = msg->data[1];
866a11e5c6SJeremy Kerr if (msg->data_size > 2)
876a11e5c6SJeremy Kerr memcpy(opal_msg->data, msg->data + 2, msg->data_size - 2);
886a11e5c6SJeremy Kerr
896a11e5c6SJeremy Kerr /* data_size already includes the netfn and cmd bytes */
906a11e5c6SJeremy Kerr size = sizeof(*opal_msg) + msg->data_size - 2;
916a11e5c6SJeremy Kerr
926a11e5c6SJeremy Kerr pr_devel("%s: opal_ipmi_send(0x%llx, %p, %ld)\n", __func__,
936a11e5c6SJeremy Kerr smi->interface_id, opal_msg, size);
946a11e5c6SJeremy Kerr rc = opal_ipmi_send(smi->interface_id, opal_msg, size);
956a11e5c6SJeremy Kerr pr_devel("%s: -> %d\n", __func__, rc);
966a11e5c6SJeremy Kerr
976a11e5c6SJeremy Kerr if (!rc) {
986a11e5c6SJeremy Kerr smi->cur_msg = msg;
996a11e5c6SJeremy Kerr spin_unlock_irqrestore(&smi->msg_lock, flags);
1006a11e5c6SJeremy Kerr return;
1016a11e5c6SJeremy Kerr }
1026a11e5c6SJeremy Kerr
1036a11e5c6SJeremy Kerr comp = IPMI_ERR_UNSPECIFIED;
1046a11e5c6SJeremy Kerr err_unlock:
1056a11e5c6SJeremy Kerr spin_unlock_irqrestore(&smi->msg_lock, flags);
1066a11e5c6SJeremy Kerr err:
1076a11e5c6SJeremy Kerr send_error_reply(smi, msg, comp);
1086a11e5c6SJeremy Kerr }
1096a11e5c6SJeremy Kerr
ipmi_powernv_recv(struct ipmi_smi_powernv * smi)1106a11e5c6SJeremy Kerr static int ipmi_powernv_recv(struct ipmi_smi_powernv *smi)
1116a11e5c6SJeremy Kerr {
1126a11e5c6SJeremy Kerr struct opal_ipmi_msg *opal_msg;
1136a11e5c6SJeremy Kerr struct ipmi_smi_msg *msg;
1146a11e5c6SJeremy Kerr unsigned long flags;
1156a11e5c6SJeremy Kerr uint64_t size;
1166a11e5c6SJeremy Kerr int rc;
1176a11e5c6SJeremy Kerr
1186a11e5c6SJeremy Kerr pr_devel("%s: opal_ipmi_recv(%llx, msg, sz)\n", __func__,
1196a11e5c6SJeremy Kerr smi->interface_id);
1206a11e5c6SJeremy Kerr
1216a11e5c6SJeremy Kerr spin_lock_irqsave(&smi->msg_lock, flags);
1226a11e5c6SJeremy Kerr
1236a11e5c6SJeremy Kerr if (!smi->cur_msg) {
124ad1ed2a9SAlistair Popple spin_unlock_irqrestore(&smi->msg_lock, flags);
1256a11e5c6SJeremy Kerr pr_warn("no current message?\n");
1266a11e5c6SJeremy Kerr return 0;
1276a11e5c6SJeremy Kerr }
1286a11e5c6SJeremy Kerr
1296a11e5c6SJeremy Kerr msg = smi->cur_msg;
1306a11e5c6SJeremy Kerr opal_msg = smi->opal_msg;
1316a11e5c6SJeremy Kerr
1326a11e5c6SJeremy Kerr size = cpu_to_be64(sizeof(*opal_msg) + IPMI_MAX_MSG_LENGTH);
1336a11e5c6SJeremy Kerr
1346a11e5c6SJeremy Kerr rc = opal_ipmi_recv(smi->interface_id,
1356a11e5c6SJeremy Kerr opal_msg,
1366a11e5c6SJeremy Kerr &size);
1376a11e5c6SJeremy Kerr size = be64_to_cpu(size);
1386a11e5c6SJeremy Kerr pr_devel("%s: -> %d (size %lld)\n", __func__,
1396a11e5c6SJeremy Kerr rc, rc == 0 ? size : 0);
1406a11e5c6SJeremy Kerr if (rc) {
141cca85f19SNeelesh Gupta /* If came via the poll, and response was not yet ready */
142cca85f19SNeelesh Gupta if (rc == OPAL_EMPTY) {
1436a11e5c6SJeremy Kerr spin_unlock_irqrestore(&smi->msg_lock, flags);
144cca85f19SNeelesh Gupta return 0;
145cca85f19SNeelesh Gupta }
146cca85f19SNeelesh Gupta
147cca85f19SNeelesh Gupta smi->cur_msg = NULL;
148cca85f19SNeelesh Gupta spin_unlock_irqrestore(&smi->msg_lock, flags);
149cca85f19SNeelesh Gupta send_error_reply(smi, msg, IPMI_ERR_UNSPECIFIED);
1506a11e5c6SJeremy Kerr return 0;
1516a11e5c6SJeremy Kerr }
1526a11e5c6SJeremy Kerr
1536a11e5c6SJeremy Kerr if (size < sizeof(*opal_msg)) {
1546a11e5c6SJeremy Kerr spin_unlock_irqrestore(&smi->msg_lock, flags);
1556a11e5c6SJeremy Kerr pr_warn("unexpected IPMI message size %lld\n", size);
1566a11e5c6SJeremy Kerr return 0;
1576a11e5c6SJeremy Kerr }
1586a11e5c6SJeremy Kerr
1596a11e5c6SJeremy Kerr if (opal_msg->version != OPAL_IPMI_MSG_FORMAT_VERSION_1) {
1606a11e5c6SJeremy Kerr spin_unlock_irqrestore(&smi->msg_lock, flags);
1616a11e5c6SJeremy Kerr pr_warn("unexpected IPMI message format (version %d)\n",
1626a11e5c6SJeremy Kerr opal_msg->version);
1636a11e5c6SJeremy Kerr return 0;
1646a11e5c6SJeremy Kerr }
1656a11e5c6SJeremy Kerr
1666a11e5c6SJeremy Kerr msg->rsp[0] = opal_msg->netfn;
1676a11e5c6SJeremy Kerr msg->rsp[1] = opal_msg->cmd;
1686a11e5c6SJeremy Kerr if (size > sizeof(*opal_msg))
1696a11e5c6SJeremy Kerr memcpy(&msg->rsp[2], opal_msg->data, size - sizeof(*opal_msg));
1706a11e5c6SJeremy Kerr msg->rsp_size = 2 + size - sizeof(*opal_msg);
1716a11e5c6SJeremy Kerr
1726a11e5c6SJeremy Kerr smi->cur_msg = NULL;
1736a11e5c6SJeremy Kerr spin_unlock_irqrestore(&smi->msg_lock, flags);
1746a11e5c6SJeremy Kerr ipmi_smi_msg_received(smi->intf, msg);
1756a11e5c6SJeremy Kerr return 0;
1766a11e5c6SJeremy Kerr }
1776a11e5c6SJeremy Kerr
ipmi_powernv_request_events(void * send_info)1786a11e5c6SJeremy Kerr static void ipmi_powernv_request_events(void *send_info)
1796a11e5c6SJeremy Kerr {
1806a11e5c6SJeremy Kerr }
1816a11e5c6SJeremy Kerr
ipmi_powernv_set_run_to_completion(void * send_info,bool run_to_completion)1826a11e5c6SJeremy Kerr static void ipmi_powernv_set_run_to_completion(void *send_info,
1836a11e5c6SJeremy Kerr bool run_to_completion)
1846a11e5c6SJeremy Kerr {
1856a11e5c6SJeremy Kerr }
1866a11e5c6SJeremy Kerr
ipmi_powernv_poll(void * send_info)1876a11e5c6SJeremy Kerr static void ipmi_powernv_poll(void *send_info)
1886a11e5c6SJeremy Kerr {
1896a11e5c6SJeremy Kerr struct ipmi_smi_powernv *smi = send_info;
1906a11e5c6SJeremy Kerr
1916a11e5c6SJeremy Kerr ipmi_powernv_recv(smi);
1926a11e5c6SJeremy Kerr }
1936a11e5c6SJeremy Kerr
194db3b7e13SBhumika Goyal static const struct ipmi_smi_handlers ipmi_powernv_smi_handlers = {
1956a11e5c6SJeremy Kerr .owner = THIS_MODULE,
1966a11e5c6SJeremy Kerr .start_processing = ipmi_powernv_start_processing,
1976a11e5c6SJeremy Kerr .sender = ipmi_powernv_send,
1986a11e5c6SJeremy Kerr .request_events = ipmi_powernv_request_events,
1996a11e5c6SJeremy Kerr .set_run_to_completion = ipmi_powernv_set_run_to_completion,
2006a11e5c6SJeremy Kerr .poll = ipmi_powernv_poll,
2016a11e5c6SJeremy Kerr };
2026a11e5c6SJeremy Kerr
ipmi_opal_event(int irq,void * data)203dce143c3SAlistair Popple static irqreturn_t ipmi_opal_event(int irq, void *data)
2046a11e5c6SJeremy Kerr {
205dce143c3SAlistair Popple struct ipmi_smi_powernv *smi = data;
2066a11e5c6SJeremy Kerr
2076a11e5c6SJeremy Kerr ipmi_powernv_recv(smi);
208dce143c3SAlistair Popple return IRQ_HANDLED;
2096a11e5c6SJeremy Kerr }
2106a11e5c6SJeremy Kerr
ipmi_powernv_probe(struct platform_device * pdev)2116a11e5c6SJeremy Kerr static int ipmi_powernv_probe(struct platform_device *pdev)
2126a11e5c6SJeremy Kerr {
2136a11e5c6SJeremy Kerr struct ipmi_smi_powernv *ipmi;
2146a11e5c6SJeremy Kerr struct device *dev;
2156a11e5c6SJeremy Kerr u32 prop;
2166a11e5c6SJeremy Kerr int rc;
2176a11e5c6SJeremy Kerr
2186a11e5c6SJeremy Kerr if (!pdev || !pdev->dev.of_node)
2196a11e5c6SJeremy Kerr return -ENODEV;
2206a11e5c6SJeremy Kerr
2216a11e5c6SJeremy Kerr dev = &pdev->dev;
2226a11e5c6SJeremy Kerr
2236a11e5c6SJeremy Kerr ipmi = devm_kzalloc(dev, sizeof(*ipmi), GFP_KERNEL);
2246a11e5c6SJeremy Kerr if (!ipmi)
2256a11e5c6SJeremy Kerr return -ENOMEM;
2266a11e5c6SJeremy Kerr
2276a11e5c6SJeremy Kerr spin_lock_init(&ipmi->msg_lock);
2286a11e5c6SJeremy Kerr
2296a11e5c6SJeremy Kerr rc = of_property_read_u32(dev->of_node, "ibm,ipmi-interface-id",
2306a11e5c6SJeremy Kerr &prop);
2316a11e5c6SJeremy Kerr if (rc) {
2326a11e5c6SJeremy Kerr dev_warn(dev, "No interface ID property\n");
2336a11e5c6SJeremy Kerr goto err_free;
2346a11e5c6SJeremy Kerr }
2356a11e5c6SJeremy Kerr ipmi->interface_id = prop;
2366a11e5c6SJeremy Kerr
2376a11e5c6SJeremy Kerr rc = of_property_read_u32(dev->of_node, "interrupts", &prop);
2386a11e5c6SJeremy Kerr if (rc) {
2396a11e5c6SJeremy Kerr dev_warn(dev, "No interrupts property\n");
2406a11e5c6SJeremy Kerr goto err_free;
2416a11e5c6SJeremy Kerr }
2426a11e5c6SJeremy Kerr
243dce143c3SAlistair Popple ipmi->irq = irq_of_parse_and_map(dev->of_node, 0);
244dce143c3SAlistair Popple if (!ipmi->irq) {
245dce143c3SAlistair Popple dev_info(dev, "Unable to map irq from device tree\n");
246dce143c3SAlistair Popple ipmi->irq = opal_event_request(prop);
247dce143c3SAlistair Popple }
2486a11e5c6SJeremy Kerr
249e749d328SWei Yongjun rc = request_irq(ipmi->irq, ipmi_opal_event, IRQ_TYPE_LEVEL_HIGH,
250e749d328SWei Yongjun "opal-ipmi", ipmi);
251e749d328SWei Yongjun if (rc) {
252dce143c3SAlistair Popple dev_warn(dev, "Unable to request irq\n");
253dce143c3SAlistair Popple goto err_dispose;
2546a11e5c6SJeremy Kerr }
2556a11e5c6SJeremy Kerr
2566a11e5c6SJeremy Kerr ipmi->opal_msg = devm_kmalloc(dev,
2576a11e5c6SJeremy Kerr sizeof(*ipmi->opal_msg) + IPMI_MAX_MSG_LENGTH,
2586a11e5c6SJeremy Kerr GFP_KERNEL);
2596a11e5c6SJeremy Kerr if (!ipmi->opal_msg) {
2606a11e5c6SJeremy Kerr rc = -ENOMEM;
2616a11e5c6SJeremy Kerr goto err_unregister;
2626a11e5c6SJeremy Kerr }
2636a11e5c6SJeremy Kerr
2641e5058eaSCorey Minyard rc = ipmi_register_smi(&ipmi_powernv_smi_handlers, ipmi, dev, 0);
2656a11e5c6SJeremy Kerr if (rc) {
2666a11e5c6SJeremy Kerr dev_warn(dev, "IPMI SMI registration failed (%d)\n", rc);
2676a11e5c6SJeremy Kerr goto err_free_msg;
2686a11e5c6SJeremy Kerr }
2696a11e5c6SJeremy Kerr
2706a11e5c6SJeremy Kerr dev_set_drvdata(dev, ipmi);
2716a11e5c6SJeremy Kerr return 0;
2726a11e5c6SJeremy Kerr
2736a11e5c6SJeremy Kerr err_free_msg:
2746a11e5c6SJeremy Kerr devm_kfree(dev, ipmi->opal_msg);
2756a11e5c6SJeremy Kerr err_unregister:
276dce143c3SAlistair Popple free_irq(ipmi->irq, ipmi);
277dce143c3SAlistair Popple err_dispose:
278dce143c3SAlistair Popple irq_dispose_mapping(ipmi->irq);
2796a11e5c6SJeremy Kerr err_free:
2806a11e5c6SJeremy Kerr devm_kfree(dev, ipmi);
2816a11e5c6SJeremy Kerr return rc;
2826a11e5c6SJeremy Kerr }
2836a11e5c6SJeremy Kerr
ipmi_powernv_remove(struct platform_device * pdev)2846a11e5c6SJeremy Kerr static int ipmi_powernv_remove(struct platform_device *pdev)
2856a11e5c6SJeremy Kerr {
2866a11e5c6SJeremy Kerr struct ipmi_smi_powernv *smi = dev_get_drvdata(&pdev->dev);
2876a11e5c6SJeremy Kerr
2886a11e5c6SJeremy Kerr ipmi_unregister_smi(smi->intf);
289dce143c3SAlistair Popple free_irq(smi->irq, smi);
290dce143c3SAlistair Popple irq_dispose_mapping(smi->irq);
291dce143c3SAlistair Popple
2926a11e5c6SJeremy Kerr return 0;
2936a11e5c6SJeremy Kerr }
2946a11e5c6SJeremy Kerr
2956a11e5c6SJeremy Kerr static const struct of_device_id ipmi_powernv_match[] = {
2966a11e5c6SJeremy Kerr { .compatible = "ibm,opal-ipmi" },
2976a11e5c6SJeremy Kerr { },
2986a11e5c6SJeremy Kerr };
2996a11e5c6SJeremy Kerr
3006a11e5c6SJeremy Kerr
3016a11e5c6SJeremy Kerr static struct platform_driver powernv_ipmi_driver = {
3026a11e5c6SJeremy Kerr .driver = {
3036a11e5c6SJeremy Kerr .name = "ipmi-powernv",
3046a11e5c6SJeremy Kerr .of_match_table = ipmi_powernv_match,
3056a11e5c6SJeremy Kerr },
3066a11e5c6SJeremy Kerr .probe = ipmi_powernv_probe,
3076a11e5c6SJeremy Kerr .remove = ipmi_powernv_remove,
3086a11e5c6SJeremy Kerr };
3096a11e5c6SJeremy Kerr
3106a11e5c6SJeremy Kerr
3116a11e5c6SJeremy Kerr module_platform_driver(powernv_ipmi_driver);
3126a11e5c6SJeremy Kerr
3136a11e5c6SJeremy Kerr MODULE_DEVICE_TABLE(of, ipmi_powernv_match);
3146a11e5c6SJeremy Kerr MODULE_DESCRIPTION("powernv IPMI driver");
3156a11e5c6SJeremy Kerr MODULE_AUTHOR("Jeremy Kerr <jk@ozlabs.org>");
3166a11e5c6SJeremy Kerr MODULE_LICENSE("GPL");
317