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Subject[PATCH 4/6] ia64 UV: Provide a LED driver for UV Systems
  * Add base functionality for writing to the LED's on
the ia64 UV architecture.

Note that this is a RAS feature that allows external monitoring of
various cpu state indicators, not just providing "pretty blinking
lights", as the LED state is readable by the system controller.

Based on linux-2.6.tip/master.

Signed-off-by: Mike Travis <travis@sgi.com>
Cc: Tony Luck <tony.luck@intel.com>
---
arch/ia64/uv/kernel/setup.c | 2 +
include/asm-ia64/uv/uv_hub.h | 61 ++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 62 insertions(+), 1 deletion(-)

--- linux-2.6.tip.orig/arch/ia64/uv/kernel/setup.c
+++ linux-2.6.tip/arch/ia64/uv/kernel/setup.c
@@ -104,6 +104,8 @@ void __init uv_setup(char **cmdline_p)
uv_cpu_hub_info(cpu)->gnode_upper = gnode_upper;
uv_cpu_hub_info(cpu)->global_mmr_base = mmr_base;
uv_cpu_hub_info(cpu)->coherency_domain_number = 0;/* ZZZ */
+ uv_cpu_hub_info(cpu)->led_offset = LED_LOCAL_MMR_BASE + lcpu;
+ uv_cpu_hub_info(cpu)->led_state = 0;
printk(KERN_DEBUG "UV cpu %d, nid %d\n", cpu, nid);
}
}
--- linux-2.6.tip.orig/include/asm-ia64/uv/uv_hub.h
+++ linux-2.6.tip/include/asm-ia64/uv/uv_hub.h
@@ -99,6 +99,7 @@ struct uv_hub_info_s {
unsigned long gnode_upper;
unsigned long lowmem_remap_top;
unsigned long lowmem_remap_base;
+ unsigned long led_offset;
unsigned short pnode;
unsigned short pnode_mask;
unsigned short coherency_domain_number;
@@ -106,6 +107,7 @@ struct uv_hub_info_s {
unsigned char blade_processor_id;
unsigned char m_val;
unsigned char n_val;
+ unsigned char led_state;
};
DECLARE_PER_CPU(struct uv_hub_info_s, __uv_hub_info);
#define uv_hub_info (&__get_cpu_var(__uv_hub_info))
@@ -134,6 +136,20 @@ DECLARE_PER_CPU(struct uv_hub_info_s, __
#define UV_GLOBAL_MMR64_PNODE_BITS(p) \
((unsigned long)(p) << UV_GLOBAL_MMR64_PNODE_SHIFT)

+/* Local Bus from cpu's perspective */
+#define LOCAL_BUS_BASE 0x1c00000
+#define LOCAL_BUS_SIZE (4 * 1024 * 1024)
+
+/* LED windows - located at top of ACPI MMR space */
+#define LED_WINDOW_COUNT 64
+#define LED_LOCAL_MMR_BASE (LOCAL_BUS_BASE + LOCAL_BUS_SIZE - \
+ LED_WINDOW_COUNT)
+
+#define LED_CPU_HEARTBEAT 0x01 /* timer interrupt */
+#define LED_CPU_ACTIVITY 0x02 /* not idle */
+#define LED_CPU_BLINK 0xffff /* blink led */
+#define LED_CPU_HB_INTERVAL (HZ/2) /* blink once per second */
+
/*
* Macros for converting between kernel virtual addresses, socket local physical
* addresses, and UV global physical addresses.
@@ -240,6 +256,16 @@ static inline void uv_write_local_mmr(un
*uv_local_mmr_address(offset) = val;
}

+static inline unsigned char uv_read_local_mmr8(unsigned long offset)
+{
+ return *((unsigned char *)uv_local_mmr_address(offset));
+}
+
+static inline void uv_write_local_mmr8(unsigned long offset, unsigned char val)
+{
+ *((unsigned char *)uv_local_mmr_address(offset)) = val;
+}
+
/*
* Structures and definitions for converting between cpu, node, pnode, and blade
* numbers.
@@ -305,5 +331,38 @@ static inline int uv_num_possible_blades
return 1;
}

-#endif /* __ASM_IA64_UV_HUB__ */
+/* Light up the leds */
+static inline void uv_set_led_bits(unsigned short value, unsigned char mask)
+{
+ unsigned char state = uv_hub_info->led_state;
+
+ if (value == LED_CPU_BLINK)
+ state ^= mask;
+ else
+ state = (state & ~mask) | (value & mask);

+ if (uv_hub_info->led_state != state) {
+ uv_hub_info->led_state = state;
+ uv_write_local_mmr8(uv_hub_info->led_offset, state);
+ }
+}
+
+/* Light up the leds */
+static inline void uv_set_led_bits_on(int cpu, unsigned short value,
+ unsigned char mask)
+
+{
+ unsigned char state = uv_cpu_hub_info(cpu)->led_state;
+
+ if (value == LED_CPU_BLINK)
+ state ^= mask;
+ else
+ state = (state & ~mask) | (value & mask);
+
+ if (uv_cpu_hub_info(cpu)->led_state != state) {
+ uv_cpu_hub_info(cpu)->led_state = state;
+ uv_write_local_mmr8(uv_cpu_hub_info(cpu)->led_offset, state);
+ }
+}
+
+#endif /* __ASM_IA64_UV_HUB__ */
--


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