powerpc/powernv: Add OPAL IPMI interface

Recent OPAL firmare adds a couple of functions to send and receive IPMI
messages:

  https://github.com/open-power/skiboot/commit/b2a374da

This change updates the token list and wrappers to suit, and adds the
platform devices for any IPMI interfaces.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

3 files changed, 33 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index 9124b0ede1fc..5d073e50cac8 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -154,6 +154,8 @@ struct opal_sg_list {
 #define OPAL_HANDLE_HMI                         98
 #define OPAL_REGISTER_DUMP_REGION               101
 #define OPAL_UNREGISTER_DUMP_REGION             102
+#define OPAL_IPMI_SEND                          107
+#define OPAL_IPMI_RECV                          108
 
 #ifndef __ASSEMBLY__
 
@@ -452,6 +454,17 @@ struct opal_msg {
         __be64 params[8];
 };
 
+enum {
+        OPAL_IPMI_MSG_FORMAT_VERSION_1 = 1,
+};
+
+struct opal_ipmi_msg {
+        uint8_t         version;
+        uint8_t         netfn;
+        uint8_t         cmd;
+        uint8_t         data[];
+};
+
 struct opal_machine_check_event {
         enum OpalMCE_Version    version:8;      /* 0x00 */
         uint8_t                 in_use;         /* 0x01 */
@@ -963,6 +976,10 @@ int64_t opal_handle_hmi(void);
 int64_t opal_register_dump_region(uint32_t id, uint64_t start, uint64_t end);
 int64_t opal_unregister_dump_region(uint32_t id);
 int64_t opal_pci_set_phb_cxl_mode(uint64_t phb_id, uint64_t mode, uint64_t pe_number);
+int64_t opal_ipmi_send(uint64_t interface, struct opal_ipmi_msg *msg,
+                uint64_t msg_len);
+int64_t opal_ipmi_recv(uint64_t interface, struct opal_ipmi_msg *msg,
+                uint64_t *msg_len);
 
 /* Internal functions */
 extern int early_init_dt_scan_opal(unsigned long node, const char *uname,
diff --git a/arch/powerpc/platforms/powernv/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal-wrappers.S
index feb549aa3eea..4f4e4009c289 100644
--- a/arch/powerpc/platforms/powernv/opal-wrappers.S
+++ b/arch/powerpc/platforms/powernv/opal-wrappers.S
@@ -250,3 +250,5 @@ OPAL_CALL(opal_handle_hmi,			OPAL_HANDLE_HMI);
 OPAL_CALL(opal_register_dump_region,            OPAL_REGISTER_DUMP_REGION);
 OPAL_CALL(opal_unregister_dump_region,          OPAL_UNREGISTER_DUMP_REGION);
 OPAL_CALL(opal_pci_set_phb_cxl_mode,            OPAL_PCI_SET_PHB_CXL_MODE);
+OPAL_CALL(opal_ipmi_send,                       OPAL_IPMI_SEND);
+OPAL_CALL(opal_ipmi_recv,                       OPAL_IPMI_RECV);
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
index d019b081df9d..0297702e8ae9 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -644,6 +644,16 @@ static void __init opal_dump_region_init(void)
                 pr_warn("DUMP: Failed to register kernel log buffer. "
                         "rc = %d\n", rc);
 }
+
+static void opal_ipmi_init(struct device_node *opal_node)
+{
+        struct device_node *np;
+
+        for_each_child_of_node(opal_node, np)
+                if (of_device_is_compatible(np, "ibm,opal-ipmi"))
+                        of_platform_device_create(np, NULL, NULL);
+}
+
 static int __init opal_init(void)
 {
         struct device_node *np, *consoles;
@@ -707,6 +717,8 @@ static int __init opal_init(void)
                 opal_msglog_init();
         }
 
+        opal_ipmi_init(opal_node);
+
         return 0;
 }
 machine_subsys_initcall(powernv, opal_init);
@@ -742,6 +754,8 @@ void opal_shutdown(void)
 
 /* Export this so that test modules can use it */
 EXPORT_SYMBOL_GPL(opal_invalid_call);
+EXPORT_SYMBOL_GPL(opal_ipmi_send);
+EXPORT_SYMBOL_GPL(opal_ipmi_recv);
 
 /* Convert a region of vmalloc memory to an opal sg list */
 struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr,