diff options
Diffstat (limited to 'arch/arm/plat-mxc/dvfs_per.c')
| -rwxr-xr-x | arch/arm/plat-mxc/dvfs_per.c | 936 |
1 files changed, 936 insertions, 0 deletions
diff --git a/arch/arm/plat-mxc/dvfs_per.c b/arch/arm/plat-mxc/dvfs_per.c new file mode 100755 index 00000000..74b10144 --- /dev/null +++ b/arch/arm/plat-mxc/dvfs_per.c @@ -0,0 +1,936 @@ +/* + * Copyright (C) 2009-2011 Freescale Semiconductor, Inc. All Rights Reserved. + */ + +/* + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +/*! + * @file dvfs_per.c + * + * @brief A simplied driver for the Freescale Semiconductor MXC DVFS module. + * + * Upon initialization, the DVFS driver initializes the DVFS hardware + * sets up driver nodes attaches to the DVFS interrupt and initializes internal + * data structures. When the DVFS interrupt occurs the driver checks the cause + * of the interrupt (lower frequency, increase frequency or emergency) and + * changes the CPU voltage according to translation table that is loaded into + * the driver. + * + * @ingroup PM + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/fs.h> +#include <linux/interrupt.h> +#include <linux/jiffies.h> +#include <linux/device.h> +#include <linux/sysdev.h> +#include <linux/delay.h> +#include <linux/clk.h> +#include <linux/regulator/consumer.h> +#include <linux/clk.h> +#include <linux/platform_device.h> +#include <linux/workqueue.h> +#include <linux/io.h> +#include <linux/slab.h> + +#include <mach/hardware.h> +#include <mach/mxc_dvfs.h> +#include <mach/sdram_autogating.h> +#include <mach/clock.h> +#if defined(CONFIG_ARCH_MX37) +#include <mach/mxc_dptc.h> +#endif + +/* DVFS PER */ +#define MXC_DVFS_PER_LTR0 0x00 +#define MXC_DVFS_PER_LTR1 0x04 +#define MXC_DVFS_PER_LTR2 0x08 +#define MXC_DVFS_PER_LTR3 0x0C +#define MXC_DVFS_PER_LTBR0 0x10 +#define MXC_DVFS_PER_LTBR1 0x14 +#define MXC_DVFS_PER_PMCR0 0x18 +#define MXC_DVFS_PER_PMCR1 0x1C + +#define DRIVER_NAME "DVFSPER" +#define DVFS_PER_DEBUG 0 + +static int dvfs_per_stop; +static int dvfs_per_low_freq; +static int dvfs_per_suspended; +static volatile int freq_increased; +static int cur_setpoint; +static struct delayed_work dvfs_per_work; +static struct clk *dvfs_clk; +static struct clk *main_bus_clk; +static struct clk *pll2; +static struct clk *lpapm; +static struct clk *cpu_clk; +static struct clk *axi_b_clk; +static struct clk *ahb_clk; +static struct clk *ddr_hf_clk; +static struct regulator *lp_regulator; + +/* Flag used to indicate if dvfs_per is active. */ +static int dvfs_per_is_active; +static int dvfs_per_is_paused; +static int ipu_freq_scaled; + +struct dvfsper_device *dvfsper_device_data; +/* DVFS platform data pointer */ +struct mxc_dvfsper_data *dvfsper_plt_data; +struct timeval prev_intr; + +int start_dvfs_per(void); +void stop_dvfs_per(void); +int dvfs_per_active(void); +int dvfs_per_divider_active(void); +int dvfs_per_pixel_clk_limit(void); + +extern int low_bus_freq_mode; +extern int bus_freq_scaling_is_active; + + +/*! + * In case the MXC device has multiple DVFS modules, this structure is used to + * store information specific to each DVFS module. + */ +struct dvfsper_device { + /* DVFS delayed work */ + struct delayed_work dvfs_work; + /* DVFS regulator */ + struct regulator *dvfs_reg; + /* DVFS clock */ + struct clk *dvfs_clk; + /* The interrupt number used by the DVFS device */ + int irq; +}; +struct dvfs_wp dvfs_per_setpoint[] = {{33, 7, 33, 20, 40, 0x10}, + {18, 0, 33, 25, 10, 0x10}, + /* When LP is at 24MHz */ + {8, 0, 10, 5, 5, 0x2E},}; + +enum { + FSVAI_FREQ_NOCHANGE = 0x0, + FSVAI_FREQ_INCREASE, + FSVAI_FREQ_DECREASE, + FSVAI_FREQ_EMERG, +}; + +#define LOW_BUS_FREQ 24000000 + +DEFINE_SPINLOCK(mxc_dvfs_per_lock); + +static void dvfs_per_load_config(void) +{ + u32 reg; + + reg = __raw_readl(dvfsper_plt_data->membase + MXC_DVFS_PER_LTR0); + reg &= ~MXC_DVFSLTR0_UPTHR_MASK; + reg &= ~MXC_DVFSLTR0_DNTHR_MASK; + reg |= dvfs_per_setpoint[cur_setpoint].upthr << + MXC_DVFSLTR0_UPTHR_OFFSET; + reg |= dvfs_per_setpoint[cur_setpoint].downthr << + MXC_DVFSLTR0_DNTHR_OFFSET; + __raw_writel(reg, dvfsper_plt_data->membase + MXC_DVFS_PER_LTR0); + + reg = __raw_readl(dvfsper_plt_data->membase + MXC_DVFS_PER_LTR1); + reg &= ~MXC_DVFSLTR1_PNCTHR_MASK; + reg &= ~MXC_DVFSLTR1_DNCNT_MASK; + reg &= ~MXC_DVFSLTR1_UPCNT_MASK; + reg |= dvfs_per_setpoint[cur_setpoint].downcnt << + MXC_DVFSLTR1_DNCNT_OFFSET; + reg |= dvfs_per_setpoint[cur_setpoint].upcnt << + MXC_DVFSLTR1_UPCNT_OFFSET; + reg |= dvfs_per_setpoint[cur_setpoint].panicthr << + MXC_DVFSLTR1_PNCTHR_OFFSET; + __raw_writel(reg, dvfsper_plt_data->membase + MXC_DVFS_PER_LTR1); + + reg = dvfs_per_setpoint[cur_setpoint].emac << + MXC_DVFSLTR2_EMAC_OFFSET; + __raw_writel(reg, dvfsper_plt_data->membase + MXC_DVFS_PER_LTR2); +} + +/*! + * This function is called for module initialization. + * It sets up the DVFS hardware. + * It sets default values for DVFS thresholds and counters. The default + * values was chosen from a set of different reasonable values. They was tested + * and the default values in the driver gave the best results. + * More work should be done to find optimal values. + * + * @return 0 if successful; non-zero otherwise. + * + */ +static int init_dvfs_per_controller(void) +{ + u32 reg; + + reg = __raw_readl(dvfsper_plt_data->membase + MXC_DVFS_PER_LTR0); + /* DIV3CLK */ + reg &= ~dvfsper_plt_data->div3_mask; + reg |= (dvfsper_plt_data->div3_div << + dvfsper_plt_data->div3_offset); + __raw_writel(reg, dvfsper_plt_data->membase + MXC_DVFS_PER_LTR0); + + reg = __raw_readl(dvfsper_plt_data->membase + MXC_DVFS_PER_LTR1); + /* Set load tracking buffer register source */ + reg &= ~MXC_DVFSLTR1_LTBRSR; + reg |= MXC_DVFSLTR1_LTBRSR; + reg &= ~MXC_DVFSLTR1_LTBRSH; + __raw_writel(reg, dvfsper_plt_data->membase + MXC_DVFS_PER_LTR1); + + /* Enable all the peripheral signals, but VPU and IPU panic*/ + __raw_writel(0x30000, dvfsper_plt_data->membase + MXC_DVFS_PER_PMCR1); + /* Disable weighted load tracking signals */ + __raw_writel(0, dvfsper_plt_data->membase + MXC_DVFS_PER_LTR3); + + reg = __raw_readl(dvfsper_plt_data->membase + MXC_DVFS_PER_PMCR0); + reg &= ~MXC_DVFSPMCR0_DVFEV; + reg |= MXC_DVFSPMCR0_LBMI; + __raw_writel(reg, dvfsper_plt_data->membase + MXC_DVFS_PER_PMCR0); + + /* DVFS loading config */ + dvfs_per_load_config(); + return 0; +} + +#if DVFS_PER_DEBUG +static void dump_dvfs_per_regs(void) +{ + struct timeval cur; + u32 diff = 0; + if (prev_intr.tv_sec == 0) + do_gettimeofday(&prev_intr); + else { + do_gettimeofday(&cur); + diff = (cur.tv_sec - prev_intr.tv_sec)*1000000 + + (cur.tv_usec - prev_intr.tv_usec); + prev_intr = cur; + } + if (diff < 90000) + printk(KERN_INFO "diff = %d\n", diff); + + printk(KERN_INFO "LTRO = 0x%08x\n", + __raw_readl(dvfsper_plt_data->membase + MXC_DVFS_PER_LTR0)); + printk(KERN_INFO "LTR1 = 0x%08x\n", + __raw_readl(dvfsper_plt_data->membase + MXC_DVFS_PER_LTR1)); + printk(KERN_INFO "LTR2 = 0x%08x\n", + __raw_readl(dvfsper_plt_data->membase + MXC_DVFS_PER_LTR2)); + printk(KERN_INFO "LTR3 = 0x%08x\n", + __raw_readl(dvfsper_plt_data->membase + MXC_DVFS_PER_LTR3)); + printk(KERN_INFO "LBTR0 = 0x%08x\n", + __raw_readl(dvfsper_plt_data->membase + MXC_DVFS_PER_LTBR0)); + printk(KERN_INFO "LBTR1 = 0x%08x\n", + __raw_readl(dvfsper_plt_data->membase + MXC_DVFS_PER_LTBR1)); + printk(KERN_INFO "PMCR0 = 0x%08x\n", + __raw_readl(dvfsper_plt_data->membase + MXC_DVFS_PER_PMCR0)); + printk(KERN_INFO "PMCR1 = 0x%08x\n", + __raw_readl(dvfsper_plt_data->membase + MXC_DVFS_PER_PMCR1)); +} +#endif + +static irqreturn_t dvfs_per_irq(int irq, void *dev_id) +{ + u32 reg; + + /* Check if DVFS1 (PER) id requesting for freqency/voltage update */ + if ((__raw_readl(dvfsper_plt_data->gpc_cntr_reg_addr) & + MXC_GPCCNTR_DVFS1CR) == 0) + return IRQ_NONE; + /* Mask DVFS irq */ + reg = __raw_readl(dvfsper_plt_data->membase + MXC_DVFS_PER_PMCR0); + /* FSVAIM=1 */ + reg |= MXC_DVFSPMCR0_FSVAIM; + __raw_writel(reg, dvfsper_plt_data->membase + MXC_DVFS_PER_PMCR0); + /* Mask GPC1 irq */ + reg = __raw_readl(dvfsper_plt_data->gpc_cntr_reg_addr); + reg |= MXC_GPCCNTR_GPCIRQM | 0x1000000; + __raw_writel(reg, dvfsper_plt_data->gpc_cntr_reg_addr); + + reg = __raw_readl(dvfsper_plt_data->membase + MXC_DVFS_PER_PMCR0); + if (reg & MXC_DVFSPMCR0_LBFL) { + /* clear LBFL */ + reg = (reg & ~MXC_DVFSPMCR0_LBFL); + reg |= MXC_DVFSPMCR0_LBFL; + __raw_writel(reg, dvfsper_plt_data->membase + + MXC_DVFS_PER_PMCR0); + } + schedule_delayed_work(&dvfs_per_work, 0); + return IRQ_HANDLED; +} + +static void dvfs_per_handler(struct work_struct *work) +{ + u32 fsvai; + u32 reg; + u32 ret; + unsigned long flags; + int retry = 20; + + /* Check DVFS frequency adjustment interrupt status */ + reg = __raw_readl(dvfsper_plt_data->membase + MXC_DVFS_PER_PMCR0); + fsvai = (reg & MXC_DVFSPMCR0_FSVAI_MASK) >> MXC_DVFSPMCR0_FSVAI_OFFSET; + /* Check FSVAI, FSVAI=0 is error */ + if (fsvai == FSVAI_FREQ_NOCHANGE) { + /* Do nothing. Freq change is not required */ + goto END; + } + +#if DVFS_PER_DEBUG + dump_dvfs_per_regs(); +#endif + /* If FSVAI indicate freq down. */ + if (fsvai == FSVAI_FREQ_DECREASE) { + if (cpu_is_mx51()) { + /*Change the DDR freq to 133Mhz. */ + clk_set_rate(ddr_hf_clk, + clk_round_rate(ddr_hf_clk, 133000000)); + } + +#ifndef DVFS_SW_WORKAROUND + spin_lock_irqsave(&mxc_dvfs_per_lock, flags); + reg = __raw_readl(dvfsper_plt_data->membase + + MXC_DVFS_PER_PMCR0); + reg &= ~MXC_DVFSPMCR0_UDCS; + __raw_writel(reg, dvfsper_plt_data->membase + + MXC_DVFS_PER_PMCR0); + + /* Set the peripheral divider */ + reg = __raw_readl(dvfsper_plt_data->gpc_cntr_reg_addr); + reg &= ~(MXC_GPCCNTR_ADU_MASK | MXC_GPCCNTR_FUPD_MASK); + reg |= MXC_GPCCNTR_FUPD; + __raw_writel(reg, dvfsper_plt_data->gpc_cntr_reg_addr); + + reg = __raw_readl(dvfsper_plt_data->gpc_vcr_reg_addr); + reg &= ~(MXC_GPCVCR_VINC_MASK | MXC_GPCVCR_VCNTU_MASK | + MXC_GPCVCR_VCNT_MASK); + reg |= (1 << MXC_GPCVCR_VCNTU_OFFSET) | + (1 << MXC_GPCVCR_VCNT_OFFSET); + __raw_writel(reg, dvfsper_plt_data->gpc_vcr_reg_addr); + + reg = __raw_readl(dvfsper_plt_data->gpc_cntr_reg_addr); + reg |= MXC_GPCCNTR_STRT; + __raw_writel(reg, dvfsper_plt_data->gpc_cntr_reg_addr); + + retry = 10; + while ((__raw_readl( + dvfsper_plt_data->gpc_cntr_reg_addr) & 0x4000) + && retry > 0) { + udelay(10); + retry--; + } + spin_unlock_irqrestore(&mxc_dvfs_per_lock, flags); +#else + /*Set the frequencies manually */ + rate = clk_get_rate(axi_b_clk); + clk_set_rate(axi_b_clk, clk_round_rate(axi_b_clk, rate/2)); + + rate = clk_get_rate(ahb_clk); + clk_set_rate(ahb_clk, clk_round_rate(ahb_clk, rate/2)); +#endif + dvfs_per_low_freq = 1; + if (clk_get_rate(main_bus_clk) == LOW_BUS_FREQ) { + cur_setpoint = 2; + } else { +#if defined(CONFIG_ARCH_MX37) + dptc_suspend(DPTC_LP_ID); +#endif + cur_setpoint = 1; +#ifndef DVFS_SW_WORKAROUND + clk_set_parent(main_bus_clk, clk_get(NULL, "pll2")); +#endif + } +#ifndef DVFS_SW_WORKAROUND + /* Drop the LP domain voltage */ + ret = regulator_set_voltage(lp_regulator, + dvfsper_plt_data->lp_low, + dvfsper_plt_data->lp_low); + if (ret < 0) { + printk(KERN_DEBUG "COULD NOT SET LP VOLTAGE\n"); + return; + } + udelay(100); +#endif + dvfs_per_load_config(); + } else if ((fsvai == FSVAI_FREQ_INCREASE) || + (fsvai == FSVAI_FREQ_EMERG)) { +#ifndef DVFS_SW_WORKAROUND + /* Increase the LP domain voltage first. */ + ret = regulator_set_voltage(lp_regulator, + dvfsper_plt_data->lp_high, + dvfsper_plt_data->lp_high); + if (ret < 0) { + printk(KERN_DEBUG "COULD NOT SET LP VOLTAGE\n"); + return; + } + udelay(100); +#endif + +#ifndef DVFS_SW_WORKAROUND + spin_lock_irqsave(&mxc_dvfs_per_lock, flags); + reg = __raw_readl(dvfsper_plt_data->membase + + MXC_DVFS_PER_PMCR0); + reg |= MXC_DVFSPMCR0_UDCS; + __raw_writel(reg, dvfsper_plt_data->membase + + MXC_DVFS_PER_PMCR0); + + reg = __raw_readl(dvfsper_plt_data->gpc_cntr_reg_addr); + reg &= ~(MXC_GPCCNTR_ADU_MASK | MXC_GPCCNTR_FUPD_MASK); + reg |= MXC_GPCCNTR_FUPD; + __raw_writel(reg, dvfsper_plt_data->gpc_cntr_reg_addr); + + reg = __raw_readl(dvfsper_plt_data->gpc_vcr_reg_addr); + reg &= ~(MXC_GPCVCR_VINC_MASK | MXC_GPCVCR_VCNTU_MASK | + MXC_GPCVCR_VCNT_MASK); + reg |= (1 << MXC_GPCVCR_VINC_OFFSET | + 1 << MXC_GPCVCR_VCNTU_OFFSET | + 1 << MXC_GPCVCR_VCNT_OFFSET); + __raw_writel(reg, dvfsper_plt_data->gpc_vcr_reg_addr); + + reg = __raw_readl(dvfsper_plt_data->gpc_cntr_reg_addr); + reg &= ~MXC_GPCCNTR_ADU; + reg |= MXC_GPCCNTR_STRT; + __raw_writel(reg, dvfsper_plt_data->gpc_cntr_reg_addr); + retry = 10; + while ((__raw_readl( + dvfsper_plt_data->gpc_cntr_reg_addr) & 0x4000) + && retry > 0) { + udelay(10); + retry--; + } + spin_unlock_irqrestore(&mxc_dvfs_per_lock, flags); + + if (retry < 0) + printk(KERN_ERR "****ERROR- DVFS\n"); +#else + /*Set the frequencies manually */ + rate = clk_get_rate(axi_b_clk); + clk_set_rate(axi_b_clk, clk_round_rate(axi_b_clk, 130000000)); + rate = clk_get_rate(ahb_clk); + clk_set_rate(ahb_clk, clk_round_rate(ahb_clk, 130000000)); +#endif + if (cpu_is_mx51()) { + /*Change the DDR freq to 200Mhz. */ + clk_set_rate(ddr_hf_clk, clk_round_rate(ddr_hf_clk, + 200000000)); + } + dvfs_per_low_freq = 0; + if (clk_get_rate(main_bus_clk) == LOW_BUS_FREQ) { + cur_setpoint = 2; + } else { + cur_setpoint = 0; +#if defined(CONFIG_ARCH_MX37) + dptc_resume(DPTC_LP_ID); +#endif +#ifndef DVFS_SW_WORKAROUND + clk_set_parent(main_bus_clk, clk_get(NULL, "pll2")); +#endif + } + dvfs_per_load_config(); + freq_increased = 1; + } + +END: +#if DVFS_PER_DEBUG + dump_dvfs_per_regs(void)(); +#endif + if (dvfs_per_is_active) { + reg = __raw_readl(dvfsper_plt_data->membase + + MXC_DVFS_PER_PMCR0); + /* Enable dVFS interrupt */ + /* FSVAIM=0 */ + reg &= ~MXC_DVFSPMCR0_FSVAI_MASK; + reg |= FSVAI_FREQ_NOCHANGE; + reg = (reg & ~MXC_DVFSPMCR0_FSVAIM); + __raw_writel(reg, dvfsper_plt_data->membase + + MXC_DVFS_PER_PMCR0); + /*Unmask GPC1 IRQ */ + reg = __raw_readl(dvfsper_plt_data->gpc_cntr_reg_addr); + reg &= ~MXC_GPCCNTR_GPCIRQM; + __raw_writel(reg, dvfsper_plt_data->gpc_cntr_reg_addr); + } +} + +static void force_freq_change(void) +{ + u32 reg; + int retry = 50; + + freq_increased = 0; + + reg = __raw_readl(dvfsper_plt_data->membase + MXC_DVFS_PER_PMCR0); + reg |= MXC_DVFSPMCR0_UDCS; + __raw_writel(reg, dvfsper_plt_data->membase + MXC_DVFS_PER_PMCR0); + + if (cpu_is_mx51()) { + /*Change the DDR freq to 133Mhz. */ + clk_set_rate(ddr_hf_clk, clk_round_rate(ddr_hf_clk, 200000000)); + } + +#ifndef DVFS_SW_WORKAROUND + reg = __raw_readl(dvfsper_plt_data->gpc_cntr_reg_addr); + reg |= MXC_GPCCNTR_FUPD; + __raw_writel(reg, dvfsper_plt_data->gpc_cntr_reg_addr); + reg = __raw_readl(dvfsper_plt_data->gpc_vcr_reg_addr); + reg &= ~(MXC_GPCVCR_VINC_MASK | MXC_GPCVCR_VCNTU_MASK | + MXC_GPCVCR_VCNT_MASK); + reg |= (1 << MXC_GPCVCR_VINC_OFFSET | + 1 << MXC_GPCVCR_VCNTU_OFFSET | + 20 << MXC_GPCVCR_VCNT_OFFSET); + __raw_writel(reg, dvfsper_plt_data->gpc_vcr_reg_addr); + reg = __raw_readl(dvfsper_plt_data->gpc_cntr_reg_addr); + reg &= ~MXC_GPCCNTR_ADU; + reg |= MXC_GPCCNTR_STRT; + __raw_writel(reg, dvfsper_plt_data->gpc_cntr_reg_addr); + while ((__raw_readl( + dvfsper_plt_data->gpc_cntr_reg_addr) & 0x4000) + && retry > 0) { + udelay(30); + retry--; + } + freq_increased = 1; + if (retry <= 0) + printk(KERN_ERR "Cannot stop DVFS-PER\n"); +#else + /* Set the frequencies manually */ + rate = clk_get_rate(axi_b_clk); + clk_set_rate(axi_b_clk, clk_round_rate(axi_b_clk, 130000000)); + rate = clk_get_rate(ahb_clk); + clk_set_rate(ahb_clk, clk_round_rate(ahb_clk, 130000000)); +#endif + dvfs_per_low_freq = 0; + +#ifndef DVFS_SW_WORKAROUND + clk_set_parent(main_bus_clk, pll2); +#endif +} + +static int start(void) +{ + u32 reg; + unsigned long flags; + + if (dvfs_per_is_active || dvfs_per_stop) + return 0; + + if (low_bus_freq_mode) + return 0; + + if (bus_freq_scaling_is_active) { + dvfs_per_is_paused = 1; + printk(KERN_INFO "Cannot start DVFS-PER since bus_freq_scaling\ + is active\n"); + return 0; + } + + if (!dvfs_per_pixel_clk_limit()) { + dvfs_per_is_paused = 1; + printk(KERN_INFO "Cannot start DVFS-PER since pixel clock is\ + above 60MHz or divider is not even\n"); + return 0; + } + + stop_sdram_autogating(); + + spin_lock_irqsave(&mxc_dvfs_per_lock, flags); + + clk_enable(dvfs_clk); + + cur_setpoint = 0; + init_dvfs_per_controller(); + + /* config reg GPC_CNTR */ + reg = __raw_readl(dvfsper_plt_data->gpc_cntr_reg_addr); + /* ADU=0, select PER domain */ + reg &= ~MXC_GPCCNTR_ADU; + __raw_writel(reg, dvfsper_plt_data->gpc_cntr_reg_addr); + + reg = __raw_readl(dvfsper_plt_data->membase + MXC_DVFS_PER_PMCR0); + /* Select ARM domain */ + reg |= MXC_DVFSPMCR0_DVFIS; + /* Set the UDCS bit */ + reg |= MXC_DVFSPMCR0_UDCS; + /* Enable DVFS interrupt */ + /* FSVAIM=0 */ + reg &= ~MXC_DVFSPMCR0_FSVAIM; + /*Set the FSVAI to no_freq_change */ + reg &= ~MXC_DVFSPMCR0_FSVAI_MASK; + reg |= FSVAI_FREQ_NOCHANGE << MXC_DVFSPMCR0_FSVAI_OFFSET; + __raw_writel(reg, dvfsper_plt_data->membase + MXC_DVFS_PER_PMCR0); + + /* config reg GPC_CNTR */ + reg = __raw_readl(dvfsper_plt_data->gpc_cntr_reg_addr); + /* GPCIRQ=1, select ARM IRQ */ + reg |= MXC_GPCCNTR_GPCIRQ_ARM; + reg &= ~MXC_GPCCNTR_GPCIRQM; + __raw_writel(reg, dvfsper_plt_data->gpc_cntr_reg_addr); + + /* Enable DVFS */ + reg = __raw_readl(dvfsper_plt_data->membase + MXC_DVFS_PER_PMCR0); + reg |= MXC_DVFSPMCR0_DVFEN; + __raw_writel(reg, dvfsper_plt_data->membase + MXC_DVFS_PER_PMCR0); + + dvfs_per_is_active = 1; + spin_unlock_irqrestore(&mxc_dvfs_per_lock, flags); + + printk(KERN_DEBUG "DVFS PER is started\n"); + + return 0; +} + +/*! + * This function disables the DVFS module. + */ +static void stop(void) +{ + u32 reg = 0; + unsigned long flags; + u32 ret = 0; + + if (dvfs_per_is_active) { + dvfs_per_is_active = 0; +#ifndef DVFS_SW_WORKAROUND + /* Increase the LP domain voltage first. */ + ret = regulator_set_voltage( + lp_regulator, dvfsper_plt_data->lp_high, + dvfsper_plt_data->lp_high); + if (ret < 0) { + printk(KERN_DEBUG "COULD NOT SET LP VOLTAGE\n"); + return; + } + udelay(100); +#endif + + spin_lock_irqsave(&mxc_dvfs_per_lock, flags); + + /* Mask dvfs irq, disable DVFS */ + reg = __raw_readl(dvfsper_plt_data->membase + + MXC_DVFS_PER_PMCR0); + /* FSVAIM=1 */ + reg |= MXC_DVFSPMCR0_FSVAIM; + __raw_writel(reg, dvfsper_plt_data->membase + + MXC_DVFS_PER_PMCR0); + + if (cur_setpoint != 0) + force_freq_change(); + + reg = __raw_readl(dvfsper_plt_data->membase + + MXC_DVFS_PER_PMCR0); + reg = (reg & ~MXC_DVFSPMCR0_DVFEN); + __raw_writel(reg, dvfsper_plt_data->membase + + MXC_DVFS_PER_PMCR0); + + spin_unlock_irqrestore(&mxc_dvfs_per_lock, flags); + clk_disable(dvfs_clk); + + start_sdram_autogating(); + } +} + + +int dvfs_per_active() +{ + return dvfs_per_is_active; +} + +int dvfs_per_divider_active() +{ + return dvfs_per_low_freq; +} + +int dvfs_per_pixel_clk_limit() +{ + struct clk *disp0_pixel_clk; + struct clk *disp1_pixel_clk; + int disp0_rate = 0; + int disp1_rate = 0; + int div1 = 0; + int div2 = 0; + int even_div1 = 1; + int even_div2 = 1; + + disp0_pixel_clk = clk_get(NULL, "pixel_clk.0"); + disp1_pixel_clk = clk_get(NULL, "pixel_clk.1"); + + if (disp0_pixel_clk != NULL) + disp0_rate = clk_get_rate(disp0_pixel_clk); + + if (disp1_pixel_clk != NULL) + disp1_rate = clk_get_rate(disp1_pixel_clk); + + /* DVFS-PER will not work if pixel clock divider is odd */ + if (disp0_rate != 0) + div1 = (clk_get_rate( + clk_get_parent(disp0_pixel_clk)) * 10) / disp0_rate; + + if ((div1 % 2) || ((div1 / 10) % 2)) + even_div1 = 0; + + if ((div2 % 2) || ((div2 / 10) % 2)) + even_div2 = 0; + + if (disp1_rate != 0) + div2 = (clk_get_rate( + clk_get_parent(disp1_pixel_clk)) * 10) / disp1_rate; + + if (((disp0_rate < DVFS_MAX_PIX_CLK && even_div1) || + !clk_get_usecount(disp0_pixel_clk)) && + ((disp1_rate < DVFS_MAX_PIX_CLK && even_div2) || + !clk_get_usecount(disp1_pixel_clk))) + ipu_freq_scaled = 1; + else + ipu_freq_scaled = 0; + + clk_put(disp0_pixel_clk); + clk_put(disp1_pixel_clk); + + return ipu_freq_scaled; +} + +int start_dvfs_per(void) +{ + if (dvfs_per_is_paused) { + dvfs_per_is_paused = 0; + return start(); + } + return 0; +} + +void stop_dvfs_per(void) +{ + if (dvfs_per_is_active) { + dvfs_per_is_paused = 1; + stop(); + } +} + +/*! + * Enable DVFS Peripheral + * + */ +int dvfs_enable(struct device *dev) +{ + if (dvfs_per_is_active) + return 0; + return start(); +} + +static ssize_t dvfsper_enable_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + if (strstr(buf, "1") != NULL) { + dvfs_per_stop = 0; + if (dvfs_enable(dev) != 0) + printk(KERN_ERR "Failed to start DVFS\n"); + } else if (strstr(buf, "0") != NULL) { + dvfs_per_stop = 1; + stop(); + } + return size; +} + +static ssize_t dvfsper_status_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int size = 0; + + if (dvfs_per_is_active) + size = sprintf(buf, "DVFS PER is enabled\n"); + else + size = sprintf(buf, "DVFS PEr is disabled\n"); + + return size; +} + +static DEVICE_ATTR(enable, 0644, dvfsper_status_show, dvfsper_enable_store); + +/*! + * This is the probe routine for the DVFS PER driver. + * + * @param pdev The platform device structure + * + * @return The function returns 0 on success + * + */ +static int __devinit mxc_dvfsper_probe(struct platform_device *pdev) +{ + int ret = 0; + struct resource *res; + struct mxc_dvfsper_data *dvfsper_data = pdev->dev.platform_data; + + if (dvfsper_data == NULL) { + printk(KERN_ERR "DVFS: Pointer to DVFS data is NULL\ + not started\n"); + return -1; + } + + /* Set driver data */ + platform_set_drvdata(pdev, dvfsper_device_data); + + dvfsper_plt_data = pdev->dev.platform_data; + dvfsper_device_data = kzalloc(sizeof(struct dvfsper_device), + GFP_KERNEL); + if (!dvfsper_device_data) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (res == NULL) { + ret = -ENODEV; + goto err1; + } + dvfsper_plt_data->membase = ioremap(res->start, + res->end - res->start + 1); + + /* + * Request the DVFSPER interrupt + */ + dvfsper_device_data->irq = platform_get_irq(pdev, 0); + if (dvfsper_device_data->irq < 0) { + ret = dvfsper_device_data->irq; + goto err1; + } + + ret = + request_irq(dvfsper_device_data->irq, dvfs_per_irq, IRQF_SHARED, + pdev->name, &pdev->dev); + if (ret) { + printk(KERN_ERR "DVFS: Unable to attach to DVFS interrupt\n"); + goto err1; + } + + lp_regulator = regulator_get(NULL, dvfsper_data->reg_id); + if (IS_ERR(lp_regulator)) { + printk(KERN_ERR "%s: failed to get lp regulator\n", __func__); + return PTR_ERR(lp_regulator); + } + + INIT_DELAYED_WORK(&dvfs_per_work, dvfs_per_handler); + + main_bus_clk = clk_get(NULL, "main_bus_clk"); + pll2 = clk_get(NULL, "pll2"); + lpapm = clk_get(NULL, "lp_apm"); + cpu_clk = clk_get(NULL, "cpu_clk"); + ahb_clk = clk_get(NULL, "ahb_clk"); + axi_b_clk = clk_get(NULL, "axi_b_clk"); + + if (cpu_is_mx51()) + ddr_hf_clk = clk_get(NULL, "ddr_hf_clk"); + + dvfsper_device_data->dvfs_clk = clk_get(NULL, dvfsper_data->clk_id); + dvfs_clk = dvfsper_device_data->dvfs_clk; + + ret = sysfs_create_file(&pdev->dev.kobj, &dev_attr_enable.attr); + + if (ret) { + printk(KERN_ERR + "DVFS: Unable to register sysdev entry for dvfs"); + goto err1; + } + + return 0; +err1: + dev_err(&pdev->dev, "Failed to probe DVFS\n"); + kfree(dvfsper_device_data); + + return ret; +} + +/*! + * This function is called to put DVFS in a low power state. + * + * @param pdev the device structure + * @param state the power state the device is entering + * + * @return The function always returns 0. + */ +static int mxc_dvfs_suspend(struct platform_device *pdev, + pm_message_t state) +{ + if (dvfs_per_is_active) { + stop_dvfs_per(); + dvfs_per_suspended = 1; + } + return 0; +} + +/*! + * This function is called to resume the DVFS from a low power state. + * + * @param dev the device structure + * @param level the stage in device suspension process that we want the + * device to be put in + * + * @return The function always returns 0. + */ +static int mxc_dvfs_resume(struct platform_device *pdev) +{ + if (dvfs_per_suspended) { + dvfs_per_suspended = 0; + return start_dvfs_per(); + } + + return 0; +} + +static struct platform_driver mxc_dvfsper_driver = { + .driver = { + .name = "mxc_dvfsper", + .owner = THIS_MODULE, + }, + .probe = mxc_dvfsper_probe, + .suspend = mxc_dvfs_suspend, + .resume = mxc_dvfs_resume, +}; + +static int __init dvfs_per_init(void) +{ + int err = 0; + + if (platform_driver_register(&mxc_dvfsper_driver) != 0) { + printk(KERN_ERR "mxc_dvfsper_driver register failed\n"); + return -ENODEV; + } + printk(KERN_INFO "DVFS PER driver module loaded\n"); + + return err; +} + +static void __exit dvfs_per_cleanup(void) +{ + stop_dvfs_per(); + + /* release the DVFS interrupt */ + free_irq(dvfsper_device_data->irq, NULL); + + clk_put(dvfs_clk); + clk_put(main_bus_clk); + clk_put(pll2); + clk_put(lpapm); + clk_put(cpu_clk); + clk_put(ahb_clk); + clk_put(axi_b_clk); + if (cpu_is_mx51()) + clk_put(ddr_hf_clk); + + /* Unregister the device structure */ + platform_driver_unregister(&mxc_dvfsper_driver); +} + +module_init(dvfs_per_init); +module_exit(dvfs_per_cleanup); + +MODULE_AUTHOR("Freescale Semiconductor, Inc."); +MODULE_DESCRIPTION("DVFS PERIPHERAL driver"); +MODULE_LICENSE("GPL"); |