mx6: add support of multi-processor command
This allows u-boot to load different OS or Bare Metal application on
different cores of the i.MX6 SoC.
For example: running Android on cpu0 and a RT OS like QNX/FreeRTOS on cpu1.
Signed-off-by: Gabriel Huau <contact@huau-gabriel.fr>
Acked-by: Stefano Babic <sbabic@denx.de>
diff --git a/arch/arm/cpu/armv7/mx6/Makefile b/arch/arm/cpu/armv7/mx6/Makefile
index 6dc9f8e..bf6effc 100644
--- a/arch/arm/cpu/armv7/mx6/Makefile
+++ b/arch/arm/cpu/armv7/mx6/Makefile
@@ -10,3 +10,4 @@
obj-y := soc.o clock.o
obj-$(CONFIG_SPL_BUILD) += ddr.o
obj-$(CONFIG_SECURE_BOOT) += hab.o
+obj-$(CONFIG_MP) += mp.o
diff --git a/arch/arm/cpu/armv7/mx6/mp.c b/arch/arm/cpu/armv7/mx6/mp.c
new file mode 100644
index 0000000..9f034d6
--- /dev/null
+++ b/arch/arm/cpu/armv7/mx6/mp.c
@@ -0,0 +1,87 @@
+/*
+ * (C) Copyright 2014
+ * Gabriel Huau <contact@huau-gabriel.fr>
+ *
+ * (C) Copyright 2009 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/errno.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/arch/imx-regs.h>
+
+#define MAX_CPUS 4
+static struct src *src = (struct src *)SRC_BASE_ADDR;
+
+static uint32_t cpu_reset_mask[MAX_CPUS] = {
+ 0, /* We don't really want to modify the cpu0 */
+ SRC_SCR_CORE_1_RESET_MASK,
+ SRC_SCR_CORE_2_RESET_MASK,
+ SRC_SCR_CORE_3_RESET_MASK
+};
+
+static uint32_t cpu_ctrl_mask[MAX_CPUS] = {
+ 0, /* We don't really want to modify the cpu0 */
+ SRC_SCR_CORE_1_ENABLE_MASK,
+ SRC_SCR_CORE_2_ENABLE_MASK,
+ SRC_SCR_CORE_3_ENABLE_MASK
+};
+
+int cpu_reset(int nr)
+{
+ /* Software reset of the CPU N */
+ src->scr |= cpu_reset_mask[nr];
+ return 0;
+}
+
+int cpu_status(int nr)
+{
+ printf("core %d => %d\n", nr, !!(src->scr & cpu_ctrl_mask[nr]));
+ return 0;
+}
+
+int cpu_release(int nr, int argc, char *const argv[])
+{
+ uint32_t boot_addr;
+
+ boot_addr = simple_strtoul(argv[0], NULL, 16);
+
+ switch (nr) {
+ case 1:
+ src->gpr3 = boot_addr;
+ break;
+ case 2:
+ src->gpr5 = boot_addr;
+ break;
+ case 3:
+ src->gpr7 = boot_addr;
+ break;
+ default:
+ return 1;
+ }
+
+ /* CPU N is ready to start */
+ src->scr |= cpu_ctrl_mask[nr];
+
+ return 0;
+}
+
+int is_core_valid(unsigned int core)
+{
+ uint32_t nr_cores = get_nr_cpus();
+
+ if (core > nr_cores)
+ return 0;
+
+ return 1;
+}
+
+int cpu_disable(int nr)
+{
+ /* Disable the CPU N */
+ src->scr &= ~cpu_ctrl_mask[nr];
+ return 0;
+}
diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c
index f2dee76..ac84a1f 100644
--- a/arch/arm/cpu/armv7/mx6/soc.c
+++ b/arch/arm/cpu/armv7/mx6/soc.c
@@ -35,6 +35,12 @@
u32 fpga_rev;
};
+u32 get_nr_cpus(void)
+{
+ struct scu_regs *scu = (struct scu_regs *)SCU_BASE_ADDR;
+ return readl(&scu->config) & 3;
+}
+
u32 get_cpu_rev(void)
{
struct anatop_regs *anatop = (struct anatop_regs *)ANATOP_BASE_ADDR;