diff options
Diffstat (limited to 'arch/arm/mach-mvebu/platsmp-a9.c')
-rw-r--r-- | arch/arm/mach-mvebu/platsmp-a9.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/arch/arm/mach-mvebu/platsmp-a9.c b/arch/arm/mach-mvebu/platsmp-a9.c new file mode 100644 index 000000000000..96c2c59e34b6 --- /dev/null +++ b/arch/arm/mach-mvebu/platsmp-a9.c @@ -0,0 +1,102 @@ +/* + * Symmetric Multi Processing (SMP) support for Marvell EBU Cortex-A9 + * based SOCs (Armada 375/38x). + * + * Copyright (C) 2014 Marvell + * + * Gregory CLEMENT <gregory.clement@free-electrons.com> + * Thomas Petazzoni <thomas.petazzoni@free-electrons.com> + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include <linux/init.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/smp.h> +#include <linux/mbus.h> +#include <asm/smp_scu.h> +#include <asm/smp_plat.h> +#include "common.h" +#include "mvebu-soc-id.h" +#include "pmsu.h" + +#define CRYPT0_ENG_ID 41 +#define CRYPT0_ENG_ATTR 0x1 +#define SRAM_PHYS_BASE 0xFFFF0000 + +#define BOOTROM_BASE 0xFFF00000 +#define BOOTROM_SIZE 0x100000 + +extern unsigned char armada_375_smp_cpu1_enable_code_end; +extern unsigned char armada_375_smp_cpu1_enable_code_start; + +void armada_375_smp_cpu1_enable_wa(void) +{ + void __iomem *sram_virt_base; + + mvebu_mbus_del_window(BOOTROM_BASE, BOOTROM_SIZE); + mvebu_mbus_add_window_by_id(CRYPT0_ENG_ID, CRYPT0_ENG_ATTR, + SRAM_PHYS_BASE, SZ_64K); + sram_virt_base = ioremap(SRAM_PHYS_BASE, SZ_64K); + + memcpy(sram_virt_base, &armada_375_smp_cpu1_enable_code_start, + &armada_375_smp_cpu1_enable_code_end + - &armada_375_smp_cpu1_enable_code_start); +} + +extern void mvebu_cortex_a9_secondary_startup(void); + +static int __cpuinit mvebu_cortex_a9_boot_secondary(unsigned int cpu, + struct task_struct *idle) +{ + int ret, hw_cpu; + + pr_info("Booting CPU %d\n", cpu); + + /* + * Write the address of secondary startup into the system-wide + * flags register. The boot monitor waits until it receives a + * soft interrupt, and then the secondary CPU branches to this + * address. + */ + hw_cpu = cpu_logical_map(cpu); + + if (of_machine_is_compatible("marvell,armada375")) { + u32 dev, rev; + + if (mvebu_get_soc_id(&dev, &rev) == 0 && + rev == ARMADA_375_Z1_REV) + armada_375_smp_cpu1_enable_wa(); + + mvebu_system_controller_set_cpu_boot_addr(mvebu_cortex_a9_secondary_startup); + } + else { + mvebu_pmsu_set_cpu_boot_addr(hw_cpu, + mvebu_cortex_a9_secondary_startup); + } + + smp_wmb(); + ret = mvebu_cpu_reset_deassert(hw_cpu); + if (ret) { + pr_err("Could not start the secondary CPU: %d\n", ret); + return ret; + } + arch_send_wakeup_ipi_mask(cpumask_of(cpu)); + + return 0; +} + +static struct smp_operations mvebu_cortex_a9_smp_ops __initdata = { + .smp_boot_secondary = mvebu_cortex_a9_boot_secondary, +#ifdef CONFIG_HOTPLUG_CPU + .cpu_die = armada_xp_cpu_die, +#endif +}; + +CPU_METHOD_OF_DECLARE(mvebu_armada_375_smp, "marvell,armada-375-smp", + &mvebu_cortex_a9_smp_ops); +CPU_METHOD_OF_DECLARE(mvebu_armada_380_smp, "marvell,armada-380-smp", + &mvebu_cortex_a9_smp_ops); |