[PATCH 4/7] MIPS: Loongson64: Remove custom count sync procudure

[Jiaxun Yang]

Now we have hotplug aware reliable sync-r4k, we can simply use
that instead of our IPI based implementation.

Signed-off-by: Jiaxun Yang <jiaxun.y...@flygoat.com>
---
 arch/mips/include/asm/smp.h |  1 -
 arch/mips/loongson64/smp.c  | 32 ++------------------------------
 2 files changed, 2 insertions(+), 31 deletions(-)

diff --git a/arch/mips/include/asm/smp.h b/arch/mips/include/asm/smp.h
index 5d9ff61004ca..2300cc0bba34 100644
--- a/arch/mips/include/asm/smp.h
+++ b/arch/mips/include/asm/smp.h
@@ -52,7 +52,6 @@ extern int __cpu_logical_map[NR_CPUS];
 #define SMP_CALL_FUNCTION      0x2
 /* Octeon - Tell another core to flush its icache */
 #define SMP_ICACHE_FLUSH       0x4
-#define SMP_ASK_C0COUNT                0x8
 
 /* Mask of CPUs which are currently definitely operating coherently */
 extern cpumask_t cpu_coherent_mask;
diff --git a/arch/mips/loongson64/smp.c b/arch/mips/loongson64/smp.c
index e744e1bee49e..d6a3a7c3d1b2 100644
--- a/arch/mips/loongson64/smp.c
+++ b/arch/mips/loongson64/smp.c
@@ -32,7 +32,6 @@ static void *ipi_clear0_regs[16];
 static void *ipi_status0_regs[16];
 static void *ipi_en0_regs[16];
 static void *ipi_mailbox_buf[16];
-static uint32_t core0_c0count[NR_CPUS];
 
 /* read a 32bit value from ipi register */
 #define loongson3_ipi_read32(addr) readl(addr)
@@ -307,8 +306,8 @@ loongson3_send_ipi_mask(const struct cpumask *mask, 
unsigned int action)
 
 static irqreturn_t loongson3_ipi_interrupt(int irq, void *dev_id)
 {
-       int i, cpu = smp_processor_id();
-       unsigned int action, c0count;
+       int cpu = smp_processor_id();
+       unsigned int action;
 
        action = ipi_read_clear(cpu);
 
@@ -321,15 +320,6 @@ static irqreturn_t loongson3_ipi_interrupt(int irq, void 
*dev_id)
                irq_exit();
        }
 
-       if (action & SMP_ASK_C0COUNT) {
-               BUG_ON(cpu != 0);
-               c0count = read_c0_count();
-               c0count = c0count ? c0count : 1;
-               for (i = 1; i < nr_cpu_ids; i++)
-                       core0_c0count[i] = c0count;
-               __wbflush(); /* Let others see the result ASAP */
-       }
-
        return IRQ_HANDLED;
 }
 
@@ -340,7 +330,6 @@ static irqreturn_t loongson3_ipi_interrupt(int irq, void 
*dev_id)
 static void loongson3_init_secondary(void)
 {
        int i;
-       uint32_t initcount;
        unsigned int cpu = smp_processor_id();
        unsigned int imask = STATUSF_IP7 | STATUSF_IP6 |
                             STATUSF_IP3 | STATUSF_IP2;
@@ -356,23 +345,6 @@ static void loongson3_init_secondary(void)
                     cpu_logical_map(cpu) % loongson_sysconf.cores_per_package);
        cpu_data[cpu].package =
                cpu_logical_map(cpu) / loongson_sysconf.cores_per_package;
-
-       i = 0;
-       core0_c0count[cpu] = 0;
-       loongson3_send_ipi_single(0, SMP_ASK_C0COUNT);
-       while (!core0_c0count[cpu]) {
-               i++;
-               cpu_relax();
-       }
-
-       if (i > MAX_LOOPS)
-               i = MAX_LOOPS;
-       if (cpu_data[cpu].package)
-               initcount = core0_c0count[cpu] + i;
-       else /* Local access is faster for loops */
-               initcount = core0_c0count[cpu] + i/2;
-
-       write_c0_count(initcount);
 }
 
 static void loongson3_smp_finish(void)
-- 
2.28.0.rc1