[IA64] Altix system controller event handling

The following is an update of the patch I sent yesterday
(3/9/05) incorporating suggestions from Christoph Hellwig and
Andreas Schwab.  It allows Altix and Altix-like systems to
handle environmental events generated by the system controllers,
and should apply on top of Jack Steiner's patch of 3/1/05 ("New
chipset support for SN platform") and Mark Goodwin's patch of
3/8/05 ("Altix SN topology support for new chipsets and pci
topology").

Signed-off-by: Greg Howard <ghoward@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

4 files changed, 63 insertions, 1 deletions

diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index 3ea8cc80ea3d..e3f5c32aac55 100644
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -42,7 +42,7 @@ obj-$(CONFIG_SX)		+= sx.o generic_serial.o
 obj-$(CONFIG_RIO)               += rio/ generic_serial.o
 obj-$(CONFIG_HVC_CONSOLE)       += hvc_console.o hvsi.o
 obj-$(CONFIG_RAW_DRIVER)        += raw.o
-obj-$(CONFIG_SGI_SNSC)          += snsc.o
+obj-$(CONFIG_SGI_SNSC)          += snsc.o snsc_event.o
 obj-$(CONFIG_MMTIMER)           += mmtimer.o
 obj-$(CONFIG_VIOCONS) += viocons.o
 obj-$(CONFIG_VIOTAPE)           += viotape.o
diff --git a/drivers/char/snsc.c b/drivers/char/snsc.c
index ffb9143376bb..e3c0b52d943f 100644
--- a/drivers/char/snsc.c
+++ b/drivers/char/snsc.c
@@ -374,6 +374,7 @@ scdrv_init(void)
         void *salbuf;
         struct class_simple *snsc_class;
         dev_t first_dev, dev;
+        nasid_t event_nasid = ia64_sn_get_console_nasid();
 
         if (alloc_chrdev_region(&first_dev, 0, numionodes,
                                 SYSCTL_BASENAME) < 0) {
@@ -441,6 +442,13 @@ scdrv_init(void)
                         ia64_sn_irtr_intr_enable(scd->scd_nasid,
                                                  0 /*ignored */ ,
                                                  SAL_IROUTER_INTR_RECV);
+
+                        /* on the console nasid, prepare to receive
+                         * system controller environmental events
+                         */
+                        if(scd->scd_nasid == event_nasid) {
+                                scdrv_event_init(scd);
+                        }
         }
         return 0;
 }
diff --git a/drivers/char/snsc.h b/drivers/char/snsc.h
index c22c6c55e254..a9efc13cc858 100644
--- a/drivers/char/snsc.h
+++ b/drivers/char/snsc.h
@@ -47,4 +47,44 @@ struct sysctl_data_s {
         nasid_t scd_nasid;      /* Node on which subchannels are opened. */
 };
 
+
+/* argument types */
+#define IR_ARG_INT              0x00    /* 4-byte integer (big-endian)  */
+#define IR_ARG_ASCII            0x01    /* null-terminated ASCII string */
+#define IR_ARG_UNKNOWN          0x80    /* unknown data type.  The low
+                                         * 7 bits will contain the data
+                                         * length.                      */
+#define IR_ARG_UNKNOWN_LENGTH_MASK      0x7f
+
+
+/* system controller event codes */
+#define EV_CLASS_MASK           0xf000ul
+#define EV_SEVERITY_MASK        0x0f00ul
+#define EV_COMPONENT_MASK       0x00fful
+
+#define EV_CLASS_POWER          0x1000ul
+#define EV_CLASS_FAN            0x2000ul
+#define EV_CLASS_TEMP           0x3000ul
+#define EV_CLASS_ENV            0x4000ul
+#define EV_CLASS_TEST_FAULT     0x5000ul
+#define EV_CLASS_TEST_WARNING   0x6000ul
+#define EV_CLASS_PWRD_NOTIFY    0x8000ul
+
+#define EV_SEVERITY_POWER_STABLE        0x0000ul
+#define EV_SEVERITY_POWER_LOW_WARNING   0x0100ul
+#define EV_SEVERITY_POWER_HIGH_WARNING  0x0200ul
+#define EV_SEVERITY_POWER_HIGH_FAULT    0x0300ul
+#define EV_SEVERITY_POWER_LOW_FAULT     0x0400ul
+
+#define EV_SEVERITY_FAN_STABLE          0x0000ul
+#define EV_SEVERITY_FAN_WARNING         0x0100ul
+#define EV_SEVERITY_FAN_FAULT           0x0200ul
+
+#define EV_SEVERITY_TEMP_STABLE         0x0000ul
+#define EV_SEVERITY_TEMP_ADVISORY       0x0100ul
+#define EV_SEVERITY_TEMP_CRITICAL       0x0200ul
+#define EV_SEVERITY_TEMP_FAULT          0x0300ul
+
+void scdrv_event_init(struct sysctl_data_s *);
+
 #endif /* _SN_SYSCTL_H_ */
diff --git a/include/asm-ia64/sn/sn_sal.h b/include/asm-ia64/sn/sn_sal.h
index 123c1a50a9dc..f914f6da077c 100644
--- a/include/asm-ia64/sn/sn_sal.h
+++ b/include/asm-ia64/sn/sn_sal.h
@@ -64,6 +64,7 @@
 
 #define  SN_SAL_SYSCTL_IOBRICK_PCI_OP              0x02000042   // reentrant
 #define  SN_SAL_IROUTER_OP                         0x02000043
+#define  SN_SAL_SYSCTL_EVENT                       0x02000044
 #define  SN_SAL_IOIF_INTERRUPT                     0x0200004a
 #define  SN_SAL_HWPERF_OP                          0x02000050   // lock
 #define  SN_SAL_IOIF_ERROR_INTERRUPT               0x02000051
@@ -850,6 +851,19 @@ ia64_sn_irtr_intr_disable(nasid_t nasid, int subch, u64 intr)
         return (int) rv.v0;
 }
 
+/*
+ * Set up a node as the point of contact for system controller
+ * environmental event delivery.
+ */
+static inline int
+ia64_sn_sysctl_event_init(nasid_t nasid)
+{
+        struct ia64_sal_retval rv;
+        SAL_CALL_REENTRANT(rv, SN_SAL_SYSCTL_EVENT, (u64) nasid,
+                           0, 0, 0, 0, 0, 0);
+        return (int) rv.v0;
+}
+
 /**
  * ia64_sn_get_fit_compt - read a FIT entry from the PROM header
  * @nasid: NASID of node to read