diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/arm/mach-tegra/powergate.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/arm/mach-tegra/powergate.c | 252 |
1 files changed, 0 insertions, 252 deletions
diff --git a/ANDROID_3.4.5/arch/arm/mach-tegra/powergate.c b/ANDROID_3.4.5/arch/arm/mach-tegra/powergate.c deleted file mode 100644 index c238699a..00000000 --- a/ANDROID_3.4.5/arch/arm/mach-tegra/powergate.c +++ /dev/null @@ -1,252 +0,0 @@ -/* - * drivers/powergate/tegra-powergate.c - * - * Copyright (c) 2010 Google, Inc - * - * Author: - * Colin Cross <ccross@google.com> - * - * This software is licensed under the terms of the GNU General Public - * License version 2, as published by the Free Software Foundation, and - * may be copied, distributed, and modified under those terms. - * - * This program is distributed in the hope that 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. - * - */ - -#include <linux/kernel.h> -#include <linux/clk.h> -#include <linux/debugfs.h> -#include <linux/delay.h> -#include <linux/err.h> -#include <linux/init.h> -#include <linux/io.h> -#include <linux/seq_file.h> -#include <linux/spinlock.h> - -#include <mach/clk.h> -#include <mach/iomap.h> -#include <mach/powergate.h> - -#include "fuse.h" - -#define PWRGATE_TOGGLE 0x30 -#define PWRGATE_TOGGLE_START (1 << 8) - -#define REMOVE_CLAMPING 0x34 - -#define PWRGATE_STATUS 0x38 - -static int tegra_num_powerdomains; -static int tegra_num_cpu_domains; -static u8 *tegra_cpu_domains; -static u8 tegra30_cpu_domains[] = { - TEGRA_POWERGATE_CPU0, - TEGRA_POWERGATE_CPU1, - TEGRA_POWERGATE_CPU2, - TEGRA_POWERGATE_CPU3, -}; - -static DEFINE_SPINLOCK(tegra_powergate_lock); - -static void __iomem *pmc = IO_ADDRESS(TEGRA_PMC_BASE); - -static u32 pmc_read(unsigned long reg) -{ - return readl(pmc + reg); -} - -static void pmc_write(u32 val, unsigned long reg) -{ - writel(val, pmc + reg); -} - -static int tegra_powergate_set(int id, bool new_state) -{ - bool status; - unsigned long flags; - - spin_lock_irqsave(&tegra_powergate_lock, flags); - - status = pmc_read(PWRGATE_STATUS) & (1 << id); - - if (status == new_state) { - spin_unlock_irqrestore(&tegra_powergate_lock, flags); - return -EINVAL; - } - - pmc_write(PWRGATE_TOGGLE_START | id, PWRGATE_TOGGLE); - - spin_unlock_irqrestore(&tegra_powergate_lock, flags); - - return 0; -} - -int tegra_powergate_power_on(int id) -{ - if (id < 0 || id >= tegra_num_powerdomains) - return -EINVAL; - - return tegra_powergate_set(id, true); -} - -int tegra_powergate_power_off(int id) -{ - if (id < 0 || id >= tegra_num_powerdomains) - return -EINVAL; - - return tegra_powergate_set(id, false); -} - -int tegra_powergate_is_powered(int id) -{ - u32 status; - - if (id < 0 || id >= tegra_num_powerdomains) - return -EINVAL; - - status = pmc_read(PWRGATE_STATUS) & (1 << id); - return !!status; -} - -int tegra_powergate_remove_clamping(int id) -{ - u32 mask; - - if (id < 0 || id >= tegra_num_powerdomains) - return -EINVAL; - - /* - * Tegra 2 has a bug where PCIE and VDE clamping masks are - * swapped relatively to the partition ids - */ - if (id == TEGRA_POWERGATE_VDEC) - mask = (1 << TEGRA_POWERGATE_PCIE); - else if (id == TEGRA_POWERGATE_PCIE) - mask = (1 << TEGRA_POWERGATE_VDEC); - else - mask = (1 << id); - - pmc_write(mask, REMOVE_CLAMPING); - - return 0; -} - -/* Must be called with clk disabled, and returns with clk enabled */ -int tegra_powergate_sequence_power_up(int id, struct clk *clk) -{ - int ret; - - tegra_periph_reset_assert(clk); - - ret = tegra_powergate_power_on(id); - if (ret) - goto err_power; - - ret = clk_enable(clk); - if (ret) - goto err_clk; - - udelay(10); - - ret = tegra_powergate_remove_clamping(id); - if (ret) - goto err_clamp; - - udelay(10); - tegra_periph_reset_deassert(clk); - - return 0; - -err_clamp: - clk_disable(clk); -err_clk: - tegra_powergate_power_off(id); -err_power: - return ret; -} - -int tegra_cpu_powergate_id(int cpuid) -{ - if (cpuid > 0 && cpuid < tegra_num_cpu_domains) - return tegra_cpu_domains[cpuid]; - - return -EINVAL; -} - -int __init tegra_powergate_init(void) -{ - switch (tegra_chip_id) { - case TEGRA20: - tegra_num_powerdomains = 7; - break; - case TEGRA30: - tegra_num_powerdomains = 14; - tegra_num_cpu_domains = 4; - tegra_cpu_domains = tegra30_cpu_domains; - break; - default: - /* Unknown Tegra variant. Disable powergating */ - tegra_num_powerdomains = 0; - break; - } - - return 0; -} - -#ifdef CONFIG_DEBUG_FS - -static const char * const powergate_name[] = { - [TEGRA_POWERGATE_CPU] = "cpu", - [TEGRA_POWERGATE_3D] = "3d", - [TEGRA_POWERGATE_VENC] = "venc", - [TEGRA_POWERGATE_VDEC] = "vdec", - [TEGRA_POWERGATE_PCIE] = "pcie", - [TEGRA_POWERGATE_L2] = "l2", - [TEGRA_POWERGATE_MPE] = "mpe", -}; - -static int powergate_show(struct seq_file *s, void *data) -{ - int i; - - seq_printf(s, " powergate powered\n"); - seq_printf(s, "------------------\n"); - - for (i = 0; i < tegra_num_powerdomains; i++) - seq_printf(s, " %9s %7s\n", powergate_name[i], - tegra_powergate_is_powered(i) ? "yes" : "no"); - return 0; -} - -static int powergate_open(struct inode *inode, struct file *file) -{ - return single_open(file, powergate_show, inode->i_private); -} - -static const struct file_operations powergate_fops = { - .open = powergate_open, - .read = seq_read, - .llseek = seq_lseek, - .release = single_release, -}; - -static int __init powergate_debugfs_init(void) -{ - struct dentry *d; - int err = -ENOMEM; - - d = debugfs_create_file("powergate", S_IRUGO, NULL, NULL, - &powergate_fops); - if (!d) - return -ENOMEM; - - return err; -} - -late_initcall(powergate_debugfs_init); - -#endif |