From: Jingchang Lu <b35083@xxxxxxxxxxxxx>
Freescale LS1021A SoC deploys two cortex-A7 processors,
this adds bring-up support for the secondary core.
Signed-off-by: Jingchang Lu <b35083@xxxxxxxxxxxxx>
---
arch/arm/mach-imx/common.h | 2 ++
arch/arm/mach-imx/headsmp.S | 11 ++++++++++
arch/arm/mach-imx/mach-ls1021a.c | 1 +
arch/arm/mach-imx/platsmp.c | 44 ++++++++++++++++++++++++++++++++++++++++
4 files changed, 58 insertions(+)
diff --git a/arch/arm/mach-imx/common.h b/arch/arm/mach-imx/common.h
index e0632d1..8cdd498 100644
--- a/arch/arm/mach-imx/common.h
+++ b/arch/arm/mach-imx/common.h
@@ -98,6 +98,7 @@ void v7_secondary_startup(void);
void imx_scu_map_io(void);
void imx_smp_prepare(void);
void imx_scu_standby_enable(void);
+void ls1021a_secondary_startup(void);
#else
static inline void imx_scu_map_io(void) {}
static inline void imx_smp_prepare(void) {}
@@ -158,5 +159,6 @@ static inline void imx_init_l2cache(void) {}
#endif
extern struct smp_operations imx_smp_ops;
+extern struct smp_operations ls1021a_smp_ops;
#endif
diff --git a/arch/arm/mach-imx/headsmp.S b/arch/arm/mach-imx/headsmp.S
index de5047c..fdd93d9 100644
--- a/arch/arm/mach-imx/headsmp.S
+++ b/arch/arm/mach-imx/headsmp.S
@@ -29,3 +29,14 @@ ENTRY(v7_secondary_startup)
set_diag_reg
b secondary_startup
ENDPROC(v7_secondary_startup)
+
+ENTRY(ls1021a_secondary_startup)
+ /* set CNTFREQ of secondary core */
+ ldr r0, =12500000
+ mcr p15, 0, r0, c14, c0, 0
+ /* disable Physical and Virtural Timer */
+ mov r0, #0x0
+ mcr p15, 0, r0, c14, c2, 1
+ mcr p15, 0, r0, c14, c3, 1
+ b secondary_startup
+ENDPROC(ls1021a_secondary_startup)
diff --git a/arch/arm/mach-imx/mach-ls1021a.c b/arch/arm/mach-imx/mach-ls1021a.c
index d1a9bb9..9931c5b 100644
--- a/arch/arm/mach-imx/mach-ls1021a.c
+++ b/arch/arm/mach-imx/mach-ls1021a.c
@@ -43,6 +43,7 @@ DT_MACHINE_START(LS1021A, "Freescale LS1021A")
#ifdef CONFIG_ZONE_DMA
.dma_zone_size = SZ_128M,
#endif
+ .smp = smp_ops(ls1021a_smp_ops),
.init_machine = ls1021a_init_machine,
.dt_compat = ls1021a_dt_compat,
.restart = mxc_restart,
diff --git a/arch/arm/mach-imx/platsmp.c b/arch/arm/mach-imx/platsmp.c
index 5b57c17..8e1bcce 100644
--- a/arch/arm/mach-imx/platsmp.c
+++ b/arch/arm/mach-imx/platsmp.c
@@ -16,6 +16,8 @@
#include <asm/page.h>
#include <asm/smp_scu.h>
#include <asm/mach/map.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
#include "common.h"
#include "hardware.h"
@@ -104,3 +106,45 @@ struct smp_operations imx_smp_ops __initdata = {
.cpu_kill = imx_cpu_kill,
#endif
};
+
+static void __iomem *dcfg_base;
+#define DCFG_CCSR_BRR 0xE4
+#define DCFG_CCSR_SCRATCHRW1 0x200
+
+static int ls1021a_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+ unsigned long paddr;
+
+ paddr = virt_to_phys(ls1021a_secondary_startup);
+ writel_relaxed(cpu_to_be32(paddr), dcfg_base + DCFG_CCSR_SCRATCHRW1);
+ /* release core for booting */
+ writel_relaxed(cpu_to_be32(0x1 << cpu), dcfg_base + DCFG_CCSR_BRR);
+
+ return 0;
+}
+
+static void __init ls1021a_smp_init_cpus(void)
+{
+ int i, ncores;
+ /* get number of cores from CP15 L2 controller register(L2CTLR)*/
+ asm volatile ("mrc p15, 1, %0, c9, c0, 2" : "=r" (ncores));
+
+ ncores = ((ncores >> 24) & 0x3) + 1;
+ for (i = ncores; i < NR_CPUS; i++)
+ set_cpu_possible(i, false);
+}
+
+static void __init ls1021a_smp_prepare_cpus(unsigned int max_cpus)
+{
+ struct device_node *np;
+
+ np = of_find_compatible_node(NULL, NULL, "fsl,ls1021a-dcfg");
+ dcfg_base = of_iomap(np, 0);
+ WARN_ON(!dcfg_base);
+}
+
+struct smp_operations ls1021a_smp_ops __initdata = {
+ .smp_init_cpus = ls1021a_smp_init_cpus,
+ .smp_prepare_cpus = ls1021a_smp_prepare_cpus,
+ .smp_boot_secondary = ls1021a_boot_secondary,
+};
--
1.8.0
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