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Message-ID: <1336737235-15370-1-git-send-email-chenhui.zhao@freescale.com>
Date: Fri, 11 May 2012 19:53:51 +0800
From: Zhao Chenhui <chenhui.zhao@...escale.com>
To: <linuxppc-dev@...ts.ozlabs.org>
CC: <linux-kernel@...r.kernel.org>, <scottwood@...escale.com>,
<galak@...nel.crashing.org>, <leoli@...escale.com>
Subject: [PATCH v5 1/5] powerpc/85xx: implement hardware timebase sync
Do hardware timebase sync. Firstly, stop all timebases, and transfer
the timebase value of the boot core to the other core. Finally,
start all timebases.
Only apply to dual-core chips, such as MPC8572, P2020, etc.
Signed-off-by: Zhao Chenhui <chenhui.zhao@...escale.com>
Signed-off-by: Li Yang <leoli@...escale.com>
---
arch/powerpc/include/asm/fsl_guts.h | 2 +
arch/powerpc/platforms/85xx/smp.c | 93 +++++++++++++++++++++++++++++++++--
2 files changed, 91 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/include/asm/fsl_guts.h b/arch/powerpc/include/asm/fsl_guts.h
index aa4c488..dd5ba2c 100644
--- a/arch/powerpc/include/asm/fsl_guts.h
+++ b/arch/powerpc/include/asm/fsl_guts.h
@@ -48,6 +48,8 @@ struct ccsr_guts {
__be32 dmuxcr; /* 0x.0068 - DMA Mux Control Register */
u8 res06c[0x70 - 0x6c];
__be32 devdisr; /* 0x.0070 - Device Disable Control */
+#define CCSR_GUTS_DEVDISR_TB1 0x00001000
+#define CCSR_GUTS_DEVDISR_TB0 0x00004000
__be32 devdisr2; /* 0x.0074 - Device Disable Control 2 */
u8 res078[0x7c - 0x78];
__be32 pmjcr; /* 0x.007c - 4 Power Management Jog Control Register */
diff --git a/arch/powerpc/platforms/85xx/smp.c b/arch/powerpc/platforms/85xx/smp.c
index ff42490..6862dda 100644
--- a/arch/powerpc/platforms/85xx/smp.c
+++ b/arch/powerpc/platforms/85xx/smp.c
@@ -24,6 +24,7 @@
#include <asm/mpic.h>
#include <asm/cacheflush.h>
#include <asm/dbell.h>
+#include <asm/fsl_guts.h>
#include <sysdev/fsl_soc.h>
#include <sysdev/mpic.h>
@@ -115,13 +116,70 @@ smp_85xx_kick_cpu(int nr)
struct smp_ops_t smp_85xx_ops = {
.kick_cpu = smp_85xx_kick_cpu,
-#ifdef CONFIG_KEXEC
- .give_timebase = smp_generic_give_timebase,
- .take_timebase = smp_generic_take_timebase,
-#endif
};
#ifdef CONFIG_KEXEC
+static struct ccsr_guts __iomem *guts;
+static u64 timebase;
+static int tb_req;
+static int tb_valid;
+
+static void mpc85xx_timebase_freeze(int freeze)
+{
+ unsigned int mask;
+
+ if (!guts)
+ return;
+
+ mask = CCSR_GUTS_DEVDISR_TB0 | CCSR_GUTS_DEVDISR_TB1;
+ if (freeze)
+ setbits32(&guts->devdisr, mask);
+ else
+ clrbits32(&guts->devdisr, mask);
+
+ in_be32(&guts->devdisr);
+}
+
+static void mpc85xx_give_timebase(void)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ while (!tb_req)
+ barrier();
+ tb_req = 0;
+
+ mpc85xx_timebase_freeze(1);
+ timebase = get_tb();
+ mb();
+ tb_valid = 1;
+
+ while (tb_valid)
+ barrier();
+
+ mpc85xx_timebase_freeze(0);
+
+ local_irq_restore(flags);
+}
+
+static void mpc85xx_take_timebase(void)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ tb_req = 1;
+ while (!tb_valid)
+ barrier();
+
+ set_tb(timebase >> 32, timebase & 0xffffffff);
+ mb();
+ tb_valid = 0;
+
+ local_irq_restore(flags);
+}
+
atomic_t kexec_down_cpus = ATOMIC_INIT(0);
void mpc85xx_smp_kexec_cpu_down(int crash_shutdown, int secondary)
@@ -228,6 +286,20 @@ smp_85xx_setup_cpu(int cpu_nr)
doorbell_setup_this_cpu();
}
+#ifdef CONFIG_KEXEC
+static const struct of_device_id guts_ids[] = {
+ { .compatible = "fsl,mpc8572-guts", },
+ { .compatible = "fsl,mpc8560-guts", },
+ { .compatible = "fsl,mpc8536-guts", },
+ { .compatible = "fsl,p1020-guts", },
+ { .compatible = "fsl,p1021-guts", },
+ { .compatible = "fsl,p1022-guts", },
+ { .compatible = "fsl,p1023-guts", },
+ { .compatible = "fsl,p2020-guts", },
+ {},
+};
+#endif
+
void __init mpc85xx_smp_init(void)
{
struct device_node *np;
@@ -249,6 +321,19 @@ void __init mpc85xx_smp_init(void)
smp_85xx_ops.cause_ipi = doorbell_cause_ipi;
}
+#ifdef CONFIG_KEXEC
+ np = of_find_matching_node(NULL, guts_ids);
+ if (np) {
+ guts = of_iomap(np, 0);
+ smp_85xx_ops.give_timebase = mpc85xx_give_timebase;
+ smp_85xx_ops.take_timebase = mpc85xx_take_timebase;
+ of_node_put(np);
+ } else {
+ smp_85xx_ops.give_timebase = smp_generic_give_timebase;
+ smp_85xx_ops.take_timebase = smp_generic_take_timebase;
+ }
+#endif
+
smp_ops = &smp_85xx_ops;
#ifdef CONFIG_KEXEC
--
1.6.4.1
--
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