[PATCH v4 08/10] ARM: sunxi: smp: Move assembly code into a file
Mylène Josserand
mylene.josserand at bootlin.com
Fri Feb 23 05:37:40 PST 2018
Move the assembly code for cluster cache enabling
into an assembly file instead of having it directly in C code.
Create a sunxi_boot entry that will perform a cluster cached
enabling and called secondary_startup.
Signed-off-by: Mylène Josserand <mylene.josserand at bootlin.com>
---
arch/arm/mach-sunxi/Makefile | 1 +
arch/arm/mach-sunxi/headsmp.S | 73 +++++++++++++++++++++++++++++++++++++++++
arch/arm/mach-sunxi/mc_smp.c | 76 ++++---------------------------------------
3 files changed, 80 insertions(+), 70 deletions(-)
create mode 100644 arch/arm/mach-sunxi/headsmp.S
diff --git a/arch/arm/mach-sunxi/Makefile b/arch/arm/mach-sunxi/Makefile
index 7de9cc286d53..d1a072b879ed 100644
--- a/arch/arm/mach-sunxi/Makefile
+++ b/arch/arm/mach-sunxi/Makefile
@@ -1,5 +1,6 @@
CFLAGS_mc_smp.o += -march=armv7-a
obj-$(CONFIG_ARCH_SUNXI) += sunxi.o
+obj-$(CONFIG_ARCH_SUNXI) += headsmp.o
obj-$(CONFIG_ARCH_SUNXI_MC_SMP) += mc_smp.o
obj-$(CONFIG_SMP) += platsmp.o
diff --git a/arch/arm/mach-sunxi/headsmp.S b/arch/arm/mach-sunxi/headsmp.S
new file mode 100644
index 000000000000..4f5957a6e188
--- /dev/null
+++ b/arch/arm/mach-sunxi/headsmp.S
@@ -0,0 +1,73 @@
+/*
+ * SMP support for sunxi based systems with Cortex A7/A15
+ *
+ * Copyright (C) 2018 Bootlin
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+ENTRY(sunxi_mc_smp_cluster_cache_enable)
+ /*
+ * Enable cluster-level coherency, in preparation for turning on the MMU.
+ *
+ * Also enable regional clock gating and L2 data latency settings for
+ * Cortex-A15. These settings are from the vendor kernel.
+ */
+ mrc p15, 0, r1, c0, c0, 0
+ movw r2, #(0xff00fff0&0xffff)
+ movt r2, #(0xff00fff0>>16)
+ and r1, r1, r2
+ movw r2, #(0x4100c0f0&0xffff)
+ movt r2, #(0x4100c0f0>>16)
+ cmp r1, r2
+ bne not_a15
+
+ /* The following is Cortex-A15 specific */
+
+ /* ACTLR2: Enable CPU regional clock gates */
+ mrc p15, 1, r1, c15, c0, 4
+ orr r1, r1, #(0x1<<31)
+ mcr p15, 1, r1, c15, c0, 4
+
+ /* L2ACTLR */
+ mrc p15, 1, r1, c15, c0, 0
+ /* Enable L2, GIC, and Timer regional clock gates */
+ orr r1, r1, #(0x1<<26)
+ /* Disable clean/evict from being pushed to external */
+ orr r1, r1, #(0x1<<3)
+ mcr p15, 1, r1, c15, c0, 0
+
+ /* L2CTRL: L2 data RAM latency */
+ mrc p15, 1, r1, c9, c0, 2
+ bic r1, r1, #(0x7<<0)
+ orr r1, r1, #(0x3<<0)
+ mcr p15, 1, r1, c9, c0, 2
+
+ /* End of Cortex-A15 specific setup */
+ not_a15:
+
+ /* Get value of sunxi_mc_smp_first_comer */
+ adr r1, first
+ ldr r0, [r1]
+ ldr r0, [r1, r0]
+
+ /* Skip cci_enable_port_for_self if not first comer */
+ cmp r0, #0
+ bxeq lr
+ b cci_enable_port_for_self
+
+ .align 2
+ first: .word sunxi_mc_smp_first_comer - .
+ENDPROC(sunxi_mc_smp_cluster_cache_enable)
+
+#ifdef CONFIG_SMP
+ENTRY(sunxi_boot)
+ bl sunxi_mc_smp_cluster_cache_enable
+ b secondary_startup
+ENDPROC(sunxi_boot)
+#endif
diff --git a/arch/arm/mach-sunxi/mc_smp.c b/arch/arm/mach-sunxi/mc_smp.c
index f2c2cfca28cd..4e807cc11a0f 100644
--- a/arch/arm/mach-sunxi/mc_smp.c
+++ b/arch/arm/mach-sunxi/mc_smp.c
@@ -82,6 +82,9 @@ static void __iomem *prcm_base;
static void __iomem *sram_b_smp_base;
static bool is_sun9i;
+extern void sunxi_boot(void);
+extern void sunxi_cluster_cache_enable(void);
+
static bool sunxi_core_is_cortex_a15(unsigned int core, unsigned int cluster)
{
struct device_node *node;
@@ -361,74 +364,7 @@ static void sunxi_cluster_cache_disable_without_axi(void)
}
static int sunxi_mc_smp_cpu_table[SUNXI_NR_CLUSTERS][SUNXI_CPUS_PER_CLUSTER];
-static int sunxi_mc_smp_first_comer;
-
-/*
- * Enable cluster-level coherency, in preparation for turning on the MMU.
- *
- * Also enable regional clock gating and L2 data latency settings for
- * Cortex-A15. These settings are from the vendor kernel.
- */
-static void __naked sunxi_mc_smp_cluster_cache_enable(void)
-{
- asm volatile (
- "mrc p15, 0, r1, c0, c0, 0\n"
- "movw r2, #" __stringify(ARM_CPU_PART_MASK & 0xffff) "\n"
- "movt r2, #" __stringify(ARM_CPU_PART_MASK >> 16) "\n"
- "and r1, r1, r2\n"
- "movw r2, #" __stringify(ARM_CPU_PART_CORTEX_A15 & 0xffff) "\n"
- "movt r2, #" __stringify(ARM_CPU_PART_CORTEX_A15 >> 16) "\n"
- "cmp r1, r2\n"
- "bne not_a15\n"
-
- /* The following is Cortex-A15 specific */
-
- /* ACTLR2: Enable CPU regional clock gates */
- "mrc p15, 1, r1, c15, c0, 4\n"
- "orr r1, r1, #(0x1<<31)\n"
- "mcr p15, 1, r1, c15, c0, 4\n"
-
- /* L2ACTLR */
- "mrc p15, 1, r1, c15, c0, 0\n"
- /* Enable L2, GIC, and Timer regional clock gates */
- "orr r1, r1, #(0x1<<26)\n"
- /* Disable clean/evict from being pushed to external */
- "orr r1, r1, #(0x1<<3)\n"
- "mcr p15, 1, r1, c15, c0, 0\n"
-
- /* L2CTRL: L2 data RAM latency */
- "mrc p15, 1, r1, c9, c0, 2\n"
- "bic r1, r1, #(0x7<<0)\n"
- "orr r1, r1, #(0x3<<0)\n"
- "mcr p15, 1, r1, c9, c0, 2\n"
-
- /* End of Cortex-A15 specific setup */
- "not_a15:\n"
-
- /* Get value of sunxi_mc_smp_first_comer */
- "adr r1, first\n"
- "ldr r0, [r1]\n"
- "ldr r0, [r1, r0]\n"
-
- /* Skip cci_enable_port_for_self if not first comer */
- "cmp r0, #0\n"
- "bxeq lr\n"
- "b cci_enable_port_for_self\n"
-
- ".align 2\n"
- "first: .word sunxi_mc_smp_first_comer - .\n"
- );
-}
-
-static void __naked sunxi_mc_smp_secondary_startup(void)
-{
- asm volatile(
- "bl sunxi_mc_smp_cluster_cache_enable\n"
- "b secondary_startup"
- /* Let compiler know about sunxi_mc_smp_cluster_cache_enable */
- :: "i" (sunxi_mc_smp_cluster_cache_enable)
- );
-}
+int sunxi_mc_smp_first_comer;
static DEFINE_SPINLOCK(boot_lock);
@@ -951,10 +887,10 @@ static int __init sunxi_mc_smp_init(void)
/* Set the hardware entry point address */
if (is_sun9i)
- writel(__pa_symbol(sunxi_mc_smp_secondary_startup),
+ writel(__pa_symbol(sunxi_boot),
prcm_base + PRCM_CPU_SOFT_ENTRY_REG);
else
- writel(__pa_symbol(sunxi_mc_smp_secondary_startup),
+ writel(__pa_symbol(sunxi_boot),
r_cpucfg_base + R_CPUCFG_CPU_SOFT_ENTRY_REG);
/* Actually enable multi cluster SMP */
--
2.11.0
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