diff options
Diffstat (limited to 'arch/arm/mach-mx28/bus_freq.c')
| -rw-r--r-- | arch/arm/mach-mx28/bus_freq.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/arch/arm/mach-mx28/bus_freq.c b/arch/arm/mach-mx28/bus_freq.c new file mode 100644 index 000000000000..920c6309e886 --- /dev/null +++ b/arch/arm/mach-mx28/bus_freq.c @@ -0,0 +1,190 @@ +/* + * Copyright (C) 2010 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. + * + * @ingroup PM + */ +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/err.h> +#include <linux/clk.h> +#include <linux/spinlock.h> +#include <linux/platform_device.h> +#include <linux/notifier.h> +#include <linux/cpufreq.h> + +#include <mach/hardware.h> +#include <linux/io.h> +#include <asm/system.h> +#include <mach/clock.h> +#include <mach/bus_freq.h> + +#include "regs-clkctrl.h" +#include "regs-digctl.h" + +#define CLKCTRL_BASE_ADDR IO_ADDRESS(CLKCTRL_PHYS_ADDR) +#define DIGCTRL_BASE_ADDR IO_ADDRESS(DIGCTL_PHYS_ADDR) +#define BF(value, field) (((value) << BP_##field) & BM_##field) + +#ifdef CONFIG_MEM_mDDR +struct profile profiles[] = { + { 454736, 151570, 205710, 0, 1550000, + 1450000, 355000, 3300000, 1750000, 24000, 0 }, + { 360000, 120000, 130910, 0, 1350000, + 1250000, 200000, 3300000, 1750000, 24000, 0 }, + { 261818, 130910, 130910, 0, 1350000, + 1250000, 173000, 3300000, 1750000, 24000, 0 }, + { 64000, 64000, 240000, 3, 1350000, + 1250000, 150000, 3300000, 1750000, 24000, 0 }, + { 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0 }, +}; +#else +struct profile profiles[] = { + { 454736, 151570, 205710, 0, 1550000, + 1450000, 355000, 3300000, 1750000, 24000, 0 }, + { 360000, 120000, 130910, 0, 1350000, + 1250000, 200000, 3300000, 1750000, 24000, 0 }, + { 261818, 130910, 130910, 0, 1350000, + 1250000, 173000, 3300000, 1750000, 24000, 0 }, + { 64000, 64000, 130910, 3, 1350000, + 1250000, 150000, 3300000, 1750000, 24000, 0 }, + { 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0 }, +}; +#endif +static struct device *busfreq_dev; +static struct clk *usb_clk0; +static struct clk *usb_clk1; +static struct clk *lcdif_clk; +u32 clkseq_setting; + +int low_freq_used(void) +{ + if ((clk_get_usecount(usb_clk0) == 0) + && (clk_get_usecount(usb_clk1) == 0) + && (clk_get_usecount(lcdif_clk) == 0)) + return 1; + else + return 0; +} + +int is_hclk_autoslow_ok(void) +{ + if ((clk_get_usecount(usb_clk0) == 0) + && (clk_get_usecount(usb_clk1) == 0)) + return 1; + else + return 0; +} + +int timing_ctrl_rams(int ss) +{ + __raw_writel(BF(ss, DIGCTL_ARMCACHE_VALID_SS) | + BF(ss, DIGCTL_ARMCACHE_DRTY_SS) | + BF(ss, DIGCTL_ARMCACHE_CACHE_SS) | + BF(ss, DIGCTL_ARMCACHE_DTAG_SS) | + BF(ss, DIGCTL_ARMCACHE_ITAG_SS), + DIGCTRL_BASE_ADDR + HW_DIGCTL_ARMCACHE); + return 0; +} + +/*! + * 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) +{ + int ret = 0; + + busfreq_dev = &pdev->dev; + + usb_clk0 = clk_get(NULL, "usb_clk0"); + if (IS_ERR(usb_clk0)) { + ret = PTR_ERR(usb_clk0); + goto out_usb0; + } + + usb_clk1 = clk_get(NULL, "usb_clk1"); + if (IS_ERR(usb_clk1)) { + ret = PTR_ERR(usb_clk1); + goto out_usb1; + } + + lcdif_clk = clk_get(NULL, "dis_lcdif"); + if (IS_ERR(lcdif_clk)) { + ret = PTR_ERR(lcdif_clk); + goto out_lcd; + } + return 0; + +out_lcd: + clk_put(usb_clk1); +out_usb1: + clk_put(usb_clk0); +out_usb0: + return ret; +} + +static struct platform_driver busfreq_driver = { + .driver = { + .name = "busfreq", + }, + .probe = busfreq_probe, +}; + +/*! + * 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) +{ + /* Unregister the device structure */ + platform_driver_unregister(&busfreq_driver); +} + +module_init(busfreq_init); +module_exit(busfreq_cleanup); + +MODULE_AUTHOR("Freescale Semiconductor, Inc."); +MODULE_DESCRIPTION("BusFreq driver"); +MODULE_LICENSE("GPL"); |