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316 lines
7.2 KiB
316 lines
7.2 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* PowerNV OPAL IPMI driver |
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* |
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* Copyright 2014 IBM Corp. |
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*/ |
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#define pr_fmt(fmt) "ipmi-powernv: " fmt |
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#include <linux/ipmi_smi.h> |
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#include <linux/list.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_irq.h> |
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#include <linux/interrupt.h> |
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#include <asm/opal.h> |
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struct ipmi_smi_powernv { |
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u64 interface_id; |
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struct ipmi_smi *intf; |
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unsigned int irq; |
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/** |
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* We assume that there can only be one outstanding request, so |
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* keep the pending message in cur_msg. We protect this from concurrent |
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* updates through send & recv calls, (and consequently opal_msg, which |
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* is in-use when cur_msg is set) with msg_lock |
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*/ |
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spinlock_t msg_lock; |
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struct ipmi_smi_msg *cur_msg; |
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struct opal_ipmi_msg *opal_msg; |
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}; |
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static int ipmi_powernv_start_processing(void *send_info, struct ipmi_smi *intf) |
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{ |
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struct ipmi_smi_powernv *smi = send_info; |
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smi->intf = intf; |
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return 0; |
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} |
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static void send_error_reply(struct ipmi_smi_powernv *smi, |
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struct ipmi_smi_msg *msg, u8 completion_code) |
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{ |
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msg->rsp[0] = msg->data[0] | 0x4; |
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msg->rsp[1] = msg->data[1]; |
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msg->rsp[2] = completion_code; |
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msg->rsp_size = 3; |
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ipmi_smi_msg_received(smi->intf, msg); |
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} |
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static void ipmi_powernv_send(void *send_info, struct ipmi_smi_msg *msg) |
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{ |
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struct ipmi_smi_powernv *smi = send_info; |
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struct opal_ipmi_msg *opal_msg; |
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unsigned long flags; |
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int comp, rc; |
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size_t size; |
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/* ensure data_len will fit in the opal_ipmi_msg buffer... */ |
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if (msg->data_size > IPMI_MAX_MSG_LENGTH) { |
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comp = IPMI_REQ_LEN_EXCEEDED_ERR; |
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goto err; |
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} |
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/* ... and that we at least have netfn and cmd bytes */ |
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if (msg->data_size < 2) { |
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comp = IPMI_REQ_LEN_INVALID_ERR; |
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goto err; |
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} |
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spin_lock_irqsave(&smi->msg_lock, flags); |
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if (smi->cur_msg) { |
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comp = IPMI_NODE_BUSY_ERR; |
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goto err_unlock; |
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} |
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/* format our data for the OPAL API */ |
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opal_msg = smi->opal_msg; |
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opal_msg->version = OPAL_IPMI_MSG_FORMAT_VERSION_1; |
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opal_msg->netfn = msg->data[0]; |
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opal_msg->cmd = msg->data[1]; |
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if (msg->data_size > 2) |
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memcpy(opal_msg->data, msg->data + 2, msg->data_size - 2); |
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/* data_size already includes the netfn and cmd bytes */ |
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size = sizeof(*opal_msg) + msg->data_size - 2; |
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pr_devel("%s: opal_ipmi_send(0x%llx, %p, %ld)\n", __func__, |
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smi->interface_id, opal_msg, size); |
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rc = opal_ipmi_send(smi->interface_id, opal_msg, size); |
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pr_devel("%s: -> %d\n", __func__, rc); |
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if (!rc) { |
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smi->cur_msg = msg; |
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spin_unlock_irqrestore(&smi->msg_lock, flags); |
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return; |
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} |
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comp = IPMI_ERR_UNSPECIFIED; |
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err_unlock: |
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spin_unlock_irqrestore(&smi->msg_lock, flags); |
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err: |
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send_error_reply(smi, msg, comp); |
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} |
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static int ipmi_powernv_recv(struct ipmi_smi_powernv *smi) |
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{ |
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struct opal_ipmi_msg *opal_msg; |
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struct ipmi_smi_msg *msg; |
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unsigned long flags; |
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uint64_t size; |
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int rc; |
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pr_devel("%s: opal_ipmi_recv(%llx, msg, sz)\n", __func__, |
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smi->interface_id); |
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spin_lock_irqsave(&smi->msg_lock, flags); |
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if (!smi->cur_msg) { |
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spin_unlock_irqrestore(&smi->msg_lock, flags); |
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pr_warn("no current message?\n"); |
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return 0; |
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} |
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msg = smi->cur_msg; |
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opal_msg = smi->opal_msg; |
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size = cpu_to_be64(sizeof(*opal_msg) + IPMI_MAX_MSG_LENGTH); |
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rc = opal_ipmi_recv(smi->interface_id, |
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opal_msg, |
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&size); |
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size = be64_to_cpu(size); |
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pr_devel("%s: -> %d (size %lld)\n", __func__, |
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rc, rc == 0 ? size : 0); |
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if (rc) { |
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/* If came via the poll, and response was not yet ready */ |
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if (rc == OPAL_EMPTY) { |
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spin_unlock_irqrestore(&smi->msg_lock, flags); |
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return 0; |
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} |
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smi->cur_msg = NULL; |
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spin_unlock_irqrestore(&smi->msg_lock, flags); |
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send_error_reply(smi, msg, IPMI_ERR_UNSPECIFIED); |
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return 0; |
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} |
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if (size < sizeof(*opal_msg)) { |
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spin_unlock_irqrestore(&smi->msg_lock, flags); |
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pr_warn("unexpected IPMI message size %lld\n", size); |
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return 0; |
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} |
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if (opal_msg->version != OPAL_IPMI_MSG_FORMAT_VERSION_1) { |
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spin_unlock_irqrestore(&smi->msg_lock, flags); |
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pr_warn("unexpected IPMI message format (version %d)\n", |
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opal_msg->version); |
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return 0; |
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} |
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msg->rsp[0] = opal_msg->netfn; |
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msg->rsp[1] = opal_msg->cmd; |
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if (size > sizeof(*opal_msg)) |
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memcpy(&msg->rsp[2], opal_msg->data, size - sizeof(*opal_msg)); |
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msg->rsp_size = 2 + size - sizeof(*opal_msg); |
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smi->cur_msg = NULL; |
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spin_unlock_irqrestore(&smi->msg_lock, flags); |
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ipmi_smi_msg_received(smi->intf, msg); |
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return 0; |
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} |
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static void ipmi_powernv_request_events(void *send_info) |
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{ |
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} |
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static void ipmi_powernv_set_run_to_completion(void *send_info, |
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bool run_to_completion) |
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{ |
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} |
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static void ipmi_powernv_poll(void *send_info) |
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{ |
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struct ipmi_smi_powernv *smi = send_info; |
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ipmi_powernv_recv(smi); |
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} |
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static const struct ipmi_smi_handlers ipmi_powernv_smi_handlers = { |
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.owner = THIS_MODULE, |
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.start_processing = ipmi_powernv_start_processing, |
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.sender = ipmi_powernv_send, |
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.request_events = ipmi_powernv_request_events, |
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.set_run_to_completion = ipmi_powernv_set_run_to_completion, |
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.poll = ipmi_powernv_poll, |
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}; |
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static irqreturn_t ipmi_opal_event(int irq, void *data) |
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{ |
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struct ipmi_smi_powernv *smi = data; |
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ipmi_powernv_recv(smi); |
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return IRQ_HANDLED; |
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} |
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static int ipmi_powernv_probe(struct platform_device *pdev) |
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{ |
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struct ipmi_smi_powernv *ipmi; |
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struct device *dev; |
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u32 prop; |
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int rc; |
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if (!pdev || !pdev->dev.of_node) |
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return -ENODEV; |
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dev = &pdev->dev; |
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ipmi = devm_kzalloc(dev, sizeof(*ipmi), GFP_KERNEL); |
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if (!ipmi) |
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return -ENOMEM; |
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spin_lock_init(&ipmi->msg_lock); |
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rc = of_property_read_u32(dev->of_node, "ibm,ipmi-interface-id", |
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&prop); |
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if (rc) { |
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dev_warn(dev, "No interface ID property\n"); |
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goto err_free; |
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} |
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ipmi->interface_id = prop; |
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rc = of_property_read_u32(dev->of_node, "interrupts", &prop); |
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if (rc) { |
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dev_warn(dev, "No interrupts property\n"); |
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goto err_free; |
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} |
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ipmi->irq = irq_of_parse_and_map(dev->of_node, 0); |
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if (!ipmi->irq) { |
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dev_info(dev, "Unable to map irq from device tree\n"); |
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ipmi->irq = opal_event_request(prop); |
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} |
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rc = request_irq(ipmi->irq, ipmi_opal_event, IRQ_TYPE_LEVEL_HIGH, |
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"opal-ipmi", ipmi); |
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if (rc) { |
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dev_warn(dev, "Unable to request irq\n"); |
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goto err_dispose; |
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} |
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ipmi->opal_msg = devm_kmalloc(dev, |
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sizeof(*ipmi->opal_msg) + IPMI_MAX_MSG_LENGTH, |
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GFP_KERNEL); |
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if (!ipmi->opal_msg) { |
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rc = -ENOMEM; |
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goto err_unregister; |
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} |
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rc = ipmi_register_smi(&ipmi_powernv_smi_handlers, ipmi, dev, 0); |
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if (rc) { |
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dev_warn(dev, "IPMI SMI registration failed (%d)\n", rc); |
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goto err_free_msg; |
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} |
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dev_set_drvdata(dev, ipmi); |
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return 0; |
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err_free_msg: |
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devm_kfree(dev, ipmi->opal_msg); |
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err_unregister: |
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free_irq(ipmi->irq, ipmi); |
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err_dispose: |
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irq_dispose_mapping(ipmi->irq); |
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err_free: |
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devm_kfree(dev, ipmi); |
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return rc; |
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} |
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static int ipmi_powernv_remove(struct platform_device *pdev) |
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{ |
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struct ipmi_smi_powernv *smi = dev_get_drvdata(&pdev->dev); |
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ipmi_unregister_smi(smi->intf); |
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free_irq(smi->irq, smi); |
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irq_dispose_mapping(smi->irq); |
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return 0; |
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} |
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static const struct of_device_id ipmi_powernv_match[] = { |
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{ .compatible = "ibm,opal-ipmi" }, |
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{ }, |
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}; |
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static struct platform_driver powernv_ipmi_driver = { |
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.driver = { |
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.name = "ipmi-powernv", |
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.of_match_table = ipmi_powernv_match, |
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}, |
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.probe = ipmi_powernv_probe, |
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.remove = ipmi_powernv_remove, |
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}; |
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module_platform_driver(powernv_ipmi_driver); |
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MODULE_DEVICE_TABLE(of, ipmi_powernv_match); |
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MODULE_DESCRIPTION("powernv IPMI driver"); |
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MODULE_AUTHOR("Jeremy Kerr <[email protected]>"); |
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MODULE_LICENSE("GPL");
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