diff options
Diffstat (limited to 'arch/arm/mach-mx6/bus_freq.c')
| -rw-r--r-- | arch/arm/mach-mx6/bus_freq.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/arch/arm/mach-mx6/bus_freq.c b/arch/arm/mach-mx6/bus_freq.c new file mode 100644 index 000000000000..3c2c24292448 --- /dev/null +++ b/arch/arm/mach-mx6/bus_freq.c @@ -0,0 +1,227 @@ +/* + * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + + * 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. + + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +/*! + * @file bus_freq.c + * + * @brief A common API for the Freescale Semiconductor i.MXC CPUfreq module + * and DVFS CORE module. + * + * The APIs are for setting bus frequency to low or high. + * + * @ingroup PM + */ +#include <asm/io.h> +#include <linux/sched.h> +#include <linux/proc_fs.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/regulator/consumer.h> +#include <linux/mutex.h> +#include <mach/iram.h> +#include <mach/hardware.h> +#include <mach/clock.h> +#include <mach/mxc_dvfs.h> +#include <mach/sdram_autogating.h> +#include <asm/mach/map.h> +#include <asm/mach-types.h> +#include <asm/cacheflush.h> +#include <asm/tlb.h> + +#define LP_LOW_VOLTAGE 1050000 +#define LP_NORMAL_VOLTAGE 1250000 +#define LP_APM_CLK 24000000 +#define NAND_LP_APM_CLK 12000000 +#define AXI_A_NORMAL_CLK 166250000 +#define AXI_A_CLK_NORMAL_DIV 4 +#define AXI_B_CLK_NORMAL_DIV 5 +#define AHB_CLK_NORMAL_DIV AXI_B_CLK_NORMAL_DIV +#define EMI_SLOW_CLK_NORMAL_DIV AXI_B_CLK_NORMAL_DIV +#define NFC_CLK_NORMAL_DIV 4 +#define SPIN_DELAY 1000000 /* in nanoseconds */ +#define DDR_TYPE_DDR3 0x0 +#define DDR_TYPE_DDR2 0x1 + +DEFINE_SPINLOCK(ddr_freq_lock); + +unsigned long lp_normal_rate; +unsigned long lp_med_rate; +unsigned long ddr_normal_rate; +unsigned long ddr_med_rate; +unsigned long ddr_low_rate; + +struct regulator *pll_regulator; + +struct regulator *lp_regulator; +int low_bus_freq_mode; +int high_bus_freq_mode; +int med_bus_freq_mode; + +int bus_freq_scaling_initialized; +char *gp_reg_id; +char *lp_reg_id; + +static struct device *busfreq_dev; +static int busfreq_suspended; + +/* True if bus_frequency is scaled not using DVFS-PER */ +int bus_freq_scaling_is_active; + +int cpu_op_nr; +int lp_high_freq; +int lp_med_freq; + +struct workqueue_struct *voltage_wq; +struct completion voltage_change_cmpl; + +int low_freq_bus_used(void); +void set_ddr_freq(int ddr_freq); + +extern struct cpu_op *(*get_cpu_op)(int *op); +extern void __iomem *ccm_base; +extern void __iomem *databahn_base; +extern int update_ddr_freq(int ddr_rate); + + +struct mutex bus_freq_mutex; + +struct timeval start_time; +struct timeval end_time; + +int set_low_bus_freq(void) +{ + return 0; +} + +int set_high_bus_freq(int high_bus_freq) +{ + return 0; +} + +void exit_lpapm_mode_mx6q(int high_bus_freq) +{ + +} + + +void set_ddr_freq(int ddr_rate) +{ + +} + +int low_freq_bus_used(void) +{ + if ((lp_high_freq == 0) + && (lp_med_freq == 0)) + return 1; + else + return 0; +} + +void setup_pll(void) +{ +} + +static ssize_t bus_freq_scaling_enable_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + if (bus_freq_scaling_is_active) + return sprintf(buf, "Bus frequency scaling is enabled\n"); + else + return sprintf(buf, "Bus frequency scaling is disabled\n"); +} + +static ssize_t bus_freq_scaling_enable_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + return size; +} + +static int busfreq_suspend(struct platform_device *pdev, pm_message_t message) +{ + if (low_bus_freq_mode) + set_high_bus_freq(1); + busfreq_suspended = 1; + return 0; +} + +static int busfreq_resume(struct platform_device *pdev) +{ + busfreq_suspended = 0; + return 0; +} + +static DEVICE_ATTR(enable, 0644, bus_freq_scaling_enable_show, + bus_freq_scaling_enable_store); + +/*! + * This is the probe routine for the bus frequency driver. + * + * @param pdev The platform device structure + * + * @return The function returns 0 on success + * + */ +static int __devinit busfreq_probe(struct platform_device *pdev) +{ + return 0; +} + +static struct platform_driver busfreq_driver = { + .driver = { + .name = "imx_busfreq", + }, + .probe = busfreq_probe, + .suspend = busfreq_suspend, + .resume = busfreq_resume, +}; + +/*! + * Initialise the busfreq_driver. + * + * @return The function always returns 0. + */ + +static int __init busfreq_init(void) +{ + if (platform_driver_register(&busfreq_driver) != 0) { + printk(KERN_ERR "busfreq_driver register failed\n"); + return -ENODEV; + } + + printk(KERN_INFO "Bus freq driver module loaded\n"); + return 0; +} + +static void __exit busfreq_cleanup(void) +{ + sysfs_remove_file(&busfreq_dev->kobj, &dev_attr_enable.attr); + + /* Unregister the device structure */ + platform_driver_unregister(&busfreq_driver); + bus_freq_scaling_initialized = 0; +} + +module_init(busfreq_init); +module_exit(busfreq_cleanup); + +MODULE_AUTHOR("Freescale Semiconductor, Inc."); +MODULE_DESCRIPTION("BusFreq driver"); +MODULE_LICENSE("GPL"); |