Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next

Pull sparc updates from David Miller:

 1) Queued spinlocks and rwlocks for sparc64, from Babu Moger.

 2) Some const'ification from Arvind Yadav.

 3) LDC/VIO driver infrastructure changes to facilitate future upcoming
    drivers, from Jag Raman.

 4) Initialize sched_clock() et al. early so that the initial printk
    timestamps are all done while the implementation is available and
    functioning. From Pavel Tatashin.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next: (38 commits)
  sparc: kernel: pmc: make of_device_ids const.
  sparc64: fix typo in property
  sparc64: add port_id to VIO device metadata
  sparc64: Enhance search for VIO device in MDESC
  sparc64: enhance VIO device probing
  sparc64: check if a client is allowed to register for MDESC notifications
  sparc64: remove restriction on VIO device name size
  sparc64: refactor code to obtain cfg_handle property from MDESC
  sparc64: add MDESC node name property to VIO device metadata
  sparc64: mdesc: use __GFP_REPEAT action modifier for VM allocation
  sparc64: expand MDESC interface
  sparc64: skip handshake for LDC channels in RAW mode
  sparc64: specify the device class in VIO version info. packet
  sparc64: ensure VIO operations are defined while being used
  sparc: kernel: apc: make of_device_ids const
  sparc/time: make of_device_ids const
  sparc64: broken %tick frequency on spitfire cpus
  sparc64: use prom interface to get %stick frequency
  sparc64: optimize functions that access tick
  sparc64: add hot-patched and inlined get_tick()
  ...

1 files changed, 67 insertions, 0 deletions

diff --git a/arch/sparc/include/asm/timer_64.h b/arch/sparc/include/asm/timer_64.h
index fce415034000..51bc3bc54bfe 100644
--- a/arch/sparc/include/asm/timer_64.h
+++ b/arch/sparc/include/asm/timer_64.h
@@ -9,7 +9,12 @@
 #include <linux/types.h>
 #include <linux/init.h>
 
+/* The most frequently accessed fields should be first,
+ * to fit into the same cacheline.
+ */
 struct sparc64_tick_ops {
+	unsigned long ticks_per_nsec_quotient;
+	unsigned long offset;
 	unsigned long long (*get_tick)(void);
 	int (*add_compare)(unsigned long);
 	unsigned long softint_mask;
@@ -17,6 +22,8 @@ struct sparc64_tick_ops {
 
 	void (*init_tick)(void);
 	unsigned long (*add_tick)(unsigned long);
+	unsigned long (*get_frequency)(void);
+	unsigned long frequency;
 
 	char *name;
 };
@@ -27,4 +34,64 @@ unsigned long sparc64_get_clock_tick(unsigned int cpu);
 void setup_sparc64_timer(void);
 void __init time_init(void);
 
+#define TICK_PRIV_BIT		BIT(63)
+#define TICKCMP_IRQ_BIT		BIT(63)
+
+#define HBIRD_STICKCMP_ADDR	0x1fe0000f060UL
+#define HBIRD_STICK_ADDR	0x1fe0000f070UL
+
+#define GET_TICK_NINSTR		13
+struct get_tick_patch {
+	unsigned int	addr;
+	unsigned int	tick[GET_TICK_NINSTR];
+	unsigned int	stick[GET_TICK_NINSTR];
+};
+
+extern struct get_tick_patch __get_tick_patch;
+extern struct get_tick_patch __get_tick_patch_end;
+
+static inline unsigned long get_tick(void)
+{
+	unsigned long tick, tmp1, tmp2;
+
+	__asm__ __volatile__(
+	/* read hbtick 13 instructions */
+	"661:\n"
+	"	mov	0x1fe, %1\n"
+	"	sllx	%1, 0x20, %1\n"
+	"	sethi	%%hi(0xf000), %2\n"
+	"	or	%2, 0x70, %2\n"
+	"	or	%1, %2, %1\n"	/* %1 = HBIRD_STICK_ADDR */
+	"	add	%1, 8, %2\n"
+	"	ldxa	[%2]%3, %0\n"
+	"	ldxa	[%1]%3, %1\n"
+	"	ldxa	[%2]%3, %2\n"
+	"	sub	%2, %0, %0\n"	/* don't modify %xcc */
+	"	brnz,pn	%0, 661b\n"	/* restart to save one register */
+	"	 sllx	%2, 32, %2\n"
+	"	or	%2, %1, %0\n"
+	/* Common/not patched code */
+	"	sllx	%0, 1, %0\n"
+	"	srlx	%0, 1, %0\n"	/* Clear TICK_PRIV_BIT */
+	/* Beginning of patch section */
+	"	.section .get_tick_patch, \"ax\"\n"
+	"	.word	661b\n"
+	/* read tick 2 instructions and 11 skipped */
+	"	ba	1f\n"
+	"	 rd	%%tick, %0\n"
+	"	.skip	4 * (%4 - 2)\n"
+	"1:\n"
+	/* read stick 2 instructions and 11 skipped */
+	"	ba	1f\n"
+	"	 rd	%%asr24, %0\n"
+	"	.skip	4 * (%4 - 2)\n"
+	"1:\n"
+	/* End of patch section */
+	"	.previous\n"
+	: "=&r" (tick), "=&r" (tmp1), "=&r" (tmp2)
+	: "i" (ASI_PHYS_BYPASS_EC_E), "i" (GET_TICK_NINSTR));
+
+	return tick;
+}
+
 #endif /* _SPARC64_TIMER_H */