diff options
Diffstat (limited to 'arch/arm/mach-tegra/pm.c')
-rw-r--r-- | arch/arm/mach-tegra/pm.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/pm.c b/arch/arm/mach-tegra/pm.c new file mode 100644 index 0000000..f88595a --- /dev/null +++ b/arch/arm/mach-tegra/pm.c @@ -0,0 +1,74 @@ +/* + * CPU complex suspend & resume functions for Tegra SoCs + * + * Copyright (c) 2009-2012, NVIDIA Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/kernel.h> +#include <linux/spinlock.h> +#include <linux/io.h> +#include <linux/cpumask.h> + +#include "iomap.h" +#include "reset.h" + +#ifdef CONFIG_PM_SLEEP +static unsigned int g_diag_reg; +static DEFINE_SPINLOCK(tegra_lp2_lock); + +void save_cpu_arch_register(void) +{ + /* read diagnostic register */ + asm("mrc p15, 0, %0, c15, c0, 1" : "=r"(g_diag_reg) : : "cc"); + return; +} + +void restore_cpu_arch_register(void) +{ + /* write diagnostic register */ + asm("mcr p15, 0, %0, c15, c0, 1" : : "r"(g_diag_reg) : "cc"); + return; +} + +void __cpuinit tegra_clear_cpu_in_lp2(int phy_cpu_id) +{ + u32 *cpu_in_lp2 = tegra_cpu_lp2_mask; + + spin_lock(&tegra_lp2_lock); + + BUG_ON(!(*cpu_in_lp2 & BIT(phy_cpu_id))); + *cpu_in_lp2 &= ~BIT(phy_cpu_id); + + spin_unlock(&tegra_lp2_lock); +} + +bool __cpuinit tegra_set_cpu_in_lp2(int phy_cpu_id) +{ + bool last_cpu = false; + cpumask_t *cpu_lp2_mask = tegra_cpu_lp2_mask; + u32 *cpu_in_lp2 = tegra_cpu_lp2_mask; + + spin_lock(&tegra_lp2_lock); + + BUG_ON((*cpu_in_lp2 & BIT(phy_cpu_id))); + *cpu_in_lp2 |= BIT(phy_cpu_id); + + if ((phy_cpu_id == 0) && cpumask_equal(cpu_lp2_mask, cpu_online_mask)) + last_cpu = true; + + spin_unlock(&tegra_lp2_lock); + return last_cpu; +} +#endif |