[POWERPC] Update smu command definitions

This updates smu.h with several new commands, and adds parameter
descriptions for existing commands.

Signed-off-by: Michael Hanselmann <linux-kernel@hansmi.ch>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 128 insertions, 4 deletions

diff --git a/include/asm-powerpc/smu.h b/include/asm-powerpc/smu.h
index e49f644ca63..76329f451ab 100644
--- a/include/asm-powerpc/smu.h
+++ b/include/asm-powerpc/smu.h
@@ -173,7 +173,7 @@
  * Power supply control
  *
  * The "sub" command is an ASCII string in the data, the
- * data lenght is that of the string.
+ * data length is that of the string.
  *
  * The VSLEW command can be used to get or set the voltage slewing.
  *  - lenght 5 (only "VSLEW") : it returns "DONE" and 3 bytes of
@@ -201,20 +201,90 @@
  */
 #define SMU_CMD_READ_ADC                        0xd8
 
+
 /* Misc commands
  *
  * This command seem to be a grab bag of various things
+ *
+ * Parameters:
+ *   1: subcommand
  */
 #define SMU_CMD_MISC_df_COMMAND                 0xdf
-#define   SMU_CMD_MISC_df_SET_DISPLAY_LIT       0x02 /* i: 1 byte */
+
+/*
+ * Sets "system ready" status
+ *
+ * I did not yet understand how it exactly works or what it does.
+ *
+ * Guessing from OF code, 0x02 activates the display backlight. Apple uses/used
+ * the same codebase for all OF versions. On PowerBooks, this command would
+ * enable the backlight. For the G5s, it only activates the front LED. However,
+ * don't take this for granted.
+ *
+ * Parameters:
+ *   2: status [0x00, 0x01 or 0x02]
+ */
+#define   SMU_CMD_MISC_df_SET_DISPLAY_LIT       0x02
+
+/*
+ * Sets mode of power switch.
+ *
+ * What this actually does is not yet known. Maybe it enables some interrupt.
+ *
+ * Parameters:
+ *   2: enable power switch? [0x00 or 0x01]
+ *   3 (optional): enable nmi? [0x00 or 0x01]
+ *
+ * Returns:
+ *   If parameter 2 is 0x00 and parameter 3 is not specified, returns wether
+ *   NMI is enabled. Otherwise unknown.
+ */
 #define   SMU_CMD_MISC_df_NMI_OPTION            0x04
 
+/* Sets LED dimm offset.
+ *
+ * The front LED dimms itself during sleep. Its brightness (or, well, the PWM
+ * frequency) depends on current time. Therefore, the SMU needs to know the
+ * timezone.
+ *
+ * Parameters:
+ *   2-8: unknown (BCD coding)
+ */
+#define   SMU_CMD_MISC_df_DIMM_OFFSET           0x99
+
+
 /*
  * Version info commands
  *
- * I haven't quite tried to figure out how these work
+ * Parameters:
+ *   1 (optional): Specifies version part to retrieve
+ *
+ * Returns:
+ *   Version value
  */
 #define SMU_CMD_VERSION_COMMAND                 0xea
+#define   SMU_VERSION_RUNNING                   0x00
+#define   SMU_VERSION_BASE                      0x01
+#define   SMU_VERSION_UPDATE                    0x02
+
+
+/*
+ * Switches
+ *
+ * These are switches whose status seems to be known to the SMU.
+ *
+ * Parameters:
+ *   none
+ *
+ * Result:
+ *   Switch bits (ORed, see below)
+ */
+#define SMU_CMD_SWITCHES                        0xdc
+
+/* Switches bits */
+#define SMU_SWITCH_CASE_CLOSED                  0x01
+#define SMU_SWITCH_AC_POWER                     0x04
+#define SMU_SWITCH_POWER_SWITCH                 0x08
 
 
 /*
@@ -243,10 +313,64 @@
  */
 #define SMU_CMD_MISC_ee_COMMAND                 0xee
 #define   SMU_CMD_MISC_ee_GET_DATABLOCK_REC     0x02
-#define   SMU_CMD_MISC_ee_LEDS_CTRL             0x04 /* i: 00 (00,01) [00] */
+
+/* Retrieves currently used watts.
+ *
+ * Parameters:
+ *   1: 0x03 (Meaning unknown)
+ */
+#define   SMU_CMD_MISC_ee_GET_WATTS             0x03
+
+#define   SMU_CMD_MISC_ee_LEDS_CTRL             0x04 /* i: 00 (00,01) [00] */
 #define   SMU_CMD_MISC_ee_GET_DATA              0x05 /* i: 00 , o: ?? */
 
 
+/*
+ * Power related commands
+ *
+ * Parameters:
+ *   1: subcommand
+ */
+#define SMU_CMD_POWER_EVENTS_COMMAND            0x8f
+
+/* SMU_POWER_EVENTS subcommands */
+enum {
+        SMU_PWR_GET_POWERUP_EVENTS      = 0x00,
+        SMU_PWR_SET_POWERUP_EVENTS      = 0x01,
+        SMU_PWR_CLR_POWERUP_EVENTS      = 0x02,
+        SMU_PWR_GET_WAKEUP_EVENTS       = 0x03,
+        SMU_PWR_SET_WAKEUP_EVENTS       = 0x04,
+        SMU_PWR_CLR_WAKEUP_EVENTS       = 0x05,
+
+        /*
+         * Get last shutdown cause
+         *
+         * Returns:
+         *   1 byte (signed char): Last shutdown cause. Exact meaning unknown.
+         */
+        SMU_PWR_LAST_SHUTDOWN_CAUSE     = 0x07,
+
+        /*
+         * Sets or gets server ID. Meaning or use is unknown.
+         *
+         * Parameters:
+         *   2 (optional): Set server ID (1 byte)
+         *
+         * Returns:
+         *   1 byte (server ID?)
+         */
+        SMU_PWR_SERVER_ID               = 0x08,
+};
+
+/* Power events wakeup bits */
+enum {
+        SMU_PWR_WAKEUP_KEY              = 0x01, /* Wake on key press */
+        SMU_PWR_WAKEUP_AC_INSERT        = 0x02, /* Wake on AC adapter plug */
+        SMU_PWR_WAKEUP_AC_CHANGE        = 0x04,
+        SMU_PWR_WAKEUP_LID_OPEN         = 0x08,
+        SMU_PWR_WAKEUP_RING             = 0x10,
+};
+
 
 /*
  * - Kernel side interface -