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/*
* Copyright (C) 2012-2014 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/cpuidle.h>
#include <linux/genalloc.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/regulator/consumer.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <asm/cpuidle.h>
#include <asm/fncpy.h>
#include <asm/mach/map.h>
#include <asm/proc-fns.h>
#include <asm/tlb.h>
#include "common.h"
#include "cpuidle.h"
#include "hardware.h"
extern u32 audio_bus_freq_mode;
extern u32 ultra_low_bus_freq_mode;
extern unsigned long reg_addrs[];
extern void imx6sl_low_power_wfi(void);
extern unsigned long save_ttbr1(void);
extern void restore_ttbr1(unsigned long ttbr1);
extern unsigned long iram_tlb_phys_addr;
extern unsigned long total_suspend_size;
extern unsigned long mx6sl_lpm_wfi_start asm("mx6sl_lpm_wfi_start");
extern unsigned long mx6sl_lpm_wfi_end asm("mx6sl_lpm_wfi_end");
static void __iomem *iomux_base;
static void *wfi_iram_base;
static struct regulator *vbus_ldo;
static struct regulator_dev *ldo2p5_dummy_regulator_rdev;
static struct regulator_init_data ldo2p5_dummy_initdata = {
.constraints = {
.valid_ops_mask = REGULATOR_CHANGE_STATUS,
},
};
static int ldo2p5_dummy_enable;
void (*imx6sl_wfi_in_iram_fn)(void *wfi_iram_base,
bool vbus_ldo, u32 audio_mode) = NULL;
static int imx6sl_enter_wait(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
{
imx6_set_lpm(WAIT_UNCLOCKED);
if (ultra_low_bus_freq_mode || audio_bus_freq_mode) {
unsigned long ttbr1;
/*
* Run WFI code from IRAM.
* Drop the DDR freq to 1MHz and AHB to 3MHz
* Also float DDR IO pads.
*/
ttbr1 = save_ttbr1();
imx6sl_wfi_in_iram_fn(wfi_iram_base, regulator_is_enabled(vbus_ldo),
audio_bus_freq_mode);
restore_ttbr1(ttbr1);
} else {
imx6sl_set_wait_clk(true);
cpu_do_idle();
imx6sl_set_wait_clk(false);
}
imx6_set_lpm(WAIT_CLOCKED);
return index;
}
static struct cpuidle_driver imx6sl_cpuidle_driver = {
.name = "imx6sl_cpuidle",
.owner = THIS_MODULE,
.states = {
/* WFI */
ARM_CPUIDLE_WFI_STATE,
/* WAIT */
{
.exit_latency = 50,
.target_residency = 75,
.flags = CPUIDLE_FLAG_TIME_VALID |
CPUIDLE_FLAG_TIMER_STOP,
.enter = imx6sl_enter_wait,
.name = "WAIT",
.desc = "Clock off",
},
},
.state_count = 2,
.safe_state_index = 0,
};
int __init imx6sl_cpuidle_init(void)
{
struct device_node *node;
u32 wfi_code_size;
node = of_find_compatible_node(NULL, NULL, "fsl,imx6sl-iomuxc");
if (!node) {
pr_err("failed to find imx6sl-iomuxc device tree data!\n");
return -EINVAL;
}
iomux_base = of_iomap(node, 0);
WARN(!iomux_base, "unable to map iomux registers\n");
vbus_ldo = regulator_get(NULL, "ldo2p5-dummy");
if (IS_ERR(vbus_ldo))
vbus_ldo = NULL;
wfi_code_size = (&mx6sl_lpm_wfi_end -&mx6sl_lpm_wfi_start) *4;
/* Get the virtual address of the wfi iram code. */
wfi_iram_base = (void *)IMX_IO_P2V(iram_tlb_phys_addr) +
total_suspend_size;
imx6sl_wfi_in_iram_fn = (void *)fncpy(wfi_iram_base,
&imx6sl_low_power_wfi, wfi_code_size);
return cpuidle_register(&imx6sl_cpuidle_driver, NULL);
}
static int imx_ldo2p5_dummy_enable(struct regulator_dev *rdev)
{
ldo2p5_dummy_enable = 1;
return 0;
}
static int imx_ldo2p5_dummy_disable(struct regulator_dev *rdev)
{
ldo2p5_dummy_enable = 0;
return 0;
}
static int imx_ldo2p5_dummy_is_enable(struct regulator_dev *rdev)
{
return ldo2p5_dummy_enable;
}
static struct regulator_ops ldo2p5_dummy_ops = {
.enable = imx_ldo2p5_dummy_enable,
.disable = imx_ldo2p5_dummy_disable,
.is_enabled = imx_ldo2p5_dummy_is_enable,
};
static struct regulator_desc ldo2p5_dummy_desc = {
.name = "ldo2p5-dummy",
.id = -1,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.ops = &ldo2p5_dummy_ops,
};
static int ldo2p5_dummy_probe(struct platform_device *pdev)
{
struct regulator_config config = { };
int ret;
config.dev = &pdev->dev;
config.init_data = &ldo2p5_dummy_initdata;
config.of_node = pdev->dev.of_node;
ldo2p5_dummy_regulator_rdev = regulator_register(&ldo2p5_dummy_desc, &config);
if (IS_ERR(ldo2p5_dummy_regulator_rdev)) {
ret = PTR_ERR(ldo2p5_dummy_regulator_rdev);
dev_err(&pdev->dev, "Failed to register dummy ldo2p5 regulator: %d\n", ret);
return ret;
}
return 0;
}
static const struct of_device_id imx_ldo2p5_dummy_ids[] = {
{ .compatible = "fsl,imx6-dummy-ldo2p5" },
};
MODULE_DEVICE_TABLE(of, imx_ldo2p5_dummy_ids);
static struct platform_driver ldo2p5_dummy_driver = {
.probe = ldo2p5_dummy_probe,
.driver = {
.name = "ldo2p5-dummy",
.owner = THIS_MODULE,
.of_match_table = imx_ldo2p5_dummy_ids,
},
};
module_platform_driver(ldo2p5_dummy_driver);
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