Thara Gopinath <thara@xxxxxx> writes:
> SmartReflex modules do adaptive voltage control for real-time
> voltage adjustments. With Smartreflex the power supply voltage
> can be adapted to the silicon performance(manufacturing process,
> temperature induced performance, age induced performance etc).
>
> There are differnet classes of smartreflex implementation.
> Class-0: Manufacturing Test Calibration
> Class-1: Boot-Time Software Calibration
> Class-2: Continuous Software Calibration
> Class-3: Continuous Hardware Calibration
> Class-4: Fully Integrated Power Management
>
> OMAP3 has two smartreflex modules one associated with VDD1 and the
> other associated with VDD2.
> This patch adds support for smartreflex driver. The driver is designed
> for Class-1 , Class-2 and Class-3 support and is a platform driver.
> Smartreflex driver can be enabled through a Kconfig option
> "SmartReflex support" under "System type"->"TI OMAP implementations" menu.
>
> Smartreflex autocompensation feature can be enabled runtime through
> a debug fs option.
> To enable smartreflex autocompensation feature
> echo 1 > /debugfs/pm_debug/smartreflex/sr_<X>/autocomp
> To disable smartreflex autocompensation feature
> echo 0 > /debugfs/pm_debug/smartreflex/sr_<X>/autocomp
>
> where X can be mpu, core , iva etc.
>
> This patch contains code originally in linux omap pm branch.
> Major contributors to this driver are
> Lesly A M, Rajendra Nayak, Kalle Jokiniemi, Paul Walmsley,
> Nishant Menon, Kevin Hilman.
>
> Signed-off-by: Thara Gopinath <thara@xxxxxx>
> ---
> arch/arm/mach-omap2/Makefile | 1 +
> arch/arm/mach-omap2/smartreflex.c | 973 +++++++++++++++++++++++++
> arch/arm/plat-omap/Kconfig | 32 +
> arch/arm/plat-omap/include/plat/smartreflex.h | 286 ++++++++
> 4 files changed, 1292 insertions(+), 0 deletions(-)
> create mode 100644 arch/arm/mach-omap2/smartreflex.c
> create mode 100644 arch/arm/plat-omap/include/plat/smartreflex.h
>
> diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
> index 1c095cf..0754886 100644
> --- a/arch/arm/mach-omap2/Makefile
> +++ b/arch/arm/mach-omap2/Makefile
> @@ -53,6 +53,7 @@ obj-$(CONFIG_ARCH_OMAP3) += pm34xx.o sleep34xx.o voltage.o \
> cpuidle34xx.o
> obj-$(CONFIG_ARCH_OMAP4) += pm44xx.o
> obj-$(CONFIG_PM_DEBUG) += pm-debug.o
> +obj-$(CONFIG_OMAP_SMARTREFLEX) += smartreflex.o
>
> AFLAGS_sleep24xx.o :=-Wa,-march=armv6
> AFLAGS_sleep34xx.o :=-Wa,-march=armv7-a
> diff --git a/arch/arm/mach-omap2/smartreflex.c b/arch/arm/mach-omap2/smartreflex.c
> new file mode 100644
> index 0000000..1c871ae
> --- /dev/null
> +++ b/arch/arm/mach-omap2/smartreflex.c
> @@ -0,0 +1,973 @@
> +/*
> + * OMAP SmartReflex Voltage Control
> + *
> + * Author: Thara Gopinath <thara@xxxxxx>
> + *
> + * Copyright (C) 2010 Texas Instruments, Inc.
> + * Thara Gopinath <thara@xxxxxx>
> + *
> + * Copyright (C) 2008 Nokia Corporation
> + * Kalle Jokiniemi
> + *
> + * Copyright (C) 2007 Texas Instruments, Inc.
> + * Lesly A M <x0080970@xxxxxx>
> + *
> + * 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/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/module.h>
> +#include <linux/err.h>
> +#include <linux/clk.h>
> +#include <linux/kobject.h>
> +#include <linux/i2c/twl.h>
> +#include <linux/io.h>
> +#include <linux/list.h>
> +#include <linux/debugfs.h>
> +#include <linux/delay.h>
> +#include <linux/slab.h>
> +
> +#include <plat/omap_hwmod.h>
> +#include <plat/omap_device.h>
> +#include <plat/common.h>
> +#include <plat/smartreflex.h>
> +
> +#define SMARTREFLEX_NAME_LEN 16
> +#define SR_DISABLE_TIMEOUT 200
> +
> +#ifdef CONFIG_PM_DEBUG
> +struct dentry *sr_dbg_dir;
> +#endif
> +
> +struct omap_sr {
> + int srid;
> + int is_sr_enable;
sr_enabled would be a better name, and should be a bool
> + int is_autocomp_active;
drop the 'is_' prefix, and should be a bool
> + int sr_ip_type;
can drop the 'sr_' prefix.
> + u32 clk_length;
> + u32 err_weight;
> + u32 err_minlimit;
> + u32 err_maxlimit;
> + u32 accum_data;
> + u32 senn_avgweight;
> + u32 senp_avgweight;
> + unsigned int irq;
> + void __iomem *base;
> + struct platform_device *pdev;
> + struct list_head node;
> + struct voltagedomain *voltdm;
> +};
> +
> +/* sr_list contains all the instances of smartreflex module */
> +static LIST_HEAD(sr_list);
> +
> +static struct omap_smartreflex_class_data *sr_class;
> +static struct omap_smartreflex_pmic_data *sr_pmic_data;
>
> +static inline void sr_write_reg(struct omap_sr *sr, unsigned offset, u32 value)
> +{
> + __raw_writel(value, (sr->base + offset));
> +}
> +
> +static inline void sr_modify_reg(struct omap_sr *sr, unsigned offset, u32 mask,
> + u32 value)
> +{
> + u32 reg_val;
> + u32 errconfig_offs, errconfig_mask;
> +
> + reg_val = __raw_readl(sr->base + offset);
> + reg_val &= ~mask;
insert blank line
> + /*
> + * Smartreflex error config register is special as it contains
> + * certain status bits which if written a 1 into means a clear
> + * of those bits. So in order to make sure no accidental write of
> + * 1 happens to those status bits, do a clear of them in the read
> + * value. Now if there is an actual reguest to write to these bits
> + * they will be set in the nex step.
> + */
> + if (sr->sr_ip_type == SR_TYPE_V1) {
> + errconfig_offs = ERRCONFIG_V1;
> + errconfig_mask = ERRCONFIG_STATUS_V1_MASK;
> + } else if (sr->sr_ip_type == SR_TYPE_V2) {
> + errconfig_offs = ERRCONFIG_V2;
> + errconfig_mask = ERRCONFIG_VPBOUNDINTST_V2;
> + }
> + if (offset == errconfig_offs)
> + reg_val &= ~errconfig_mask;
> +
> + reg_val |= value;
> +
> + __raw_writel(reg_val, (sr->base + offset));
> +}
> +
> +static inline u32 sr_read_reg(struct omap_sr *sr, unsigned offset)
> +{
> + return __raw_readl(sr->base + offset);
> +}
> +
> +static struct omap_sr *_sr_lookup(struct voltagedomain *voltdm)
> +{
> + struct omap_sr *sr_info;
> +
> + if (!voltdm) {
> + pr_err("%s: Null voltage domain passed!\n", __func__);
> + return ERR_PTR(-EINVAL);
> + }
> +
> + list_for_each_entry(sr_info, &sr_list, node) {
> + if (voltdm == sr_info->voltdm)
> + return sr_info;
> + }
> +
> + return ERR_PTR(-ENODATA);
> +}
> +
> +static irqreturn_t sr_omap_isr(int irq, void *data)
> +{
> + struct omap_sr *sr_info = (struct omap_sr *)data;
> + u32 status = 0;
> +
> + if (sr_info->sr_ip_type == SR_TYPE_V1) {
> + /* Read the status bits */
> + status = sr_read_reg(sr_info, ERRCONFIG_V1);
> + /* Clear them by writing back */
> + sr_write_reg(sr_info, ERRCONFIG_V1, status);
> + } else if (sr_info->sr_ip_type == SR_TYPE_V2) {
> + /* Read the status bits */
> + sr_read_reg(sr_info, IRQSTATUS);
> + /* Clear them by writing back */
> + sr_write_reg(sr_info, IRQSTATUS, status);
> + }
> +
> + /* Call the class driver notify function if registered*/
> + if (sr_class->class_type == SR_CLASS2 && sr_class->notify)
> + sr_class->notify(sr_info->voltdm, status);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static void sr_set_clk_length(struct omap_sr *sr)
> +{
> + struct clk *sys_ck;
> + u32 sys_clk_speed;
> +
> + sys_ck = clk_get(NULL, "sys_ck");
> + sys_clk_speed = clk_get_rate(sys_ck);
clock API calls can fail. Please check error codes
> + clk_put(sys_ck);
> +
> + switch (sys_clk_speed) {
> + case 12000000:
> + sr->clk_length = SRCLKLENGTH_12MHZ_SYSCLK;
> + break;
> + case 13000000:
> + sr->clk_length = SRCLKLENGTH_13MHZ_SYSCLK;
> + break;
> + case 19200000:
> + sr->clk_length = SRCLKLENGTH_19MHZ_SYSCLK;
> + break;
> + case 26000000:
> + sr->clk_length = SRCLKLENGTH_26MHZ_SYSCLK;
> + break;
> + case 38400000:
> + sr->clk_length = SRCLKLENGTH_38MHZ_SYSCLK;
> + break;
> + default:
> + dev_err(&sr->pdev->dev, "%s: Invalid sysclk value: %d\n",
> + __func__, sys_clk_speed);
> + break;
> + }
> +}
> +
> +static void sr_set_regfields(struct omap_sr *sr)
> +{
> + /*
> + * For time being these values are defined in smartreflex.h
> + * and populated during init. May be they can be moved to board
> + * file or pmic specific data structure. In that case these structure
> + * fields will have to be populated using the pdata or pmic structure.
> + */
> + if (cpu_is_omap34xx()) {
> + sr->err_weight = OMAP3430_SR_ERRWEIGHT;
> + sr->err_maxlimit = OMAP3430_SR_ERRMAXLIMIT;
> + sr->accum_data = OMAP3430_SR_ACCUMDATA;
> + if (!(strcmp(sr->voltdm->name, "mpu"))) {
> + sr->senn_avgweight = OMAP3430_SR1_SENNAVGWEIGHT;
> + sr->senp_avgweight = OMAP3430_SR1_SENPAVGWEIGHT;
> + } else {
> + sr->senn_avgweight = OMAP3430_SR2_SENNAVGWEIGHT;
> + sr->senp_avgweight = OMAP3430_SR2_SENPAVGWEIGHT;
> + }
> + }
> + /* TODO: 3630 and Omap4 specific bit field values */
> +}
> +
> +static void sr_start_vddautocomp(struct omap_sr *sr)
> +{
> + if (!sr_class || !(sr_class->enable) || !(sr_class->configure)) {
> + dev_warn(&sr->pdev->dev,
> + "%s: smartreflex class driver not registered\n",
> + __func__);
This should probably be WARN_ONCE(), otherwise it looks like this warn
will keep coming on a board without a class driver registered.
> + return;
> + }
> +
> + sr->is_autocomp_active = 1;
> + if (sr_class->enable(sr->voltdm))
> + sr->is_autocomp_active = 0;
This is a bit confusing on first read. Why not
if (!sr_class->enable(sr->voltdm))
sr->is_autocomp_active = 1;
> +}
> +
> +static void sr_stop_vddautocomp(struct omap_sr *sr)
> +{
> + if (!sr_class || !(sr_class->disable)) {
> + dev_warn(&sr->pdev->dev,
> + "%s: smartreflex class driver not registered\n",
> + __func__);
> + return;
> + }
> +
> + if (sr->is_autocomp_active == 1) {
> + sr_class->disable(sr->voltdm, 1);
> + sr->is_autocomp_active = 0;
> + }
>
> +}
> +
> +/*
> + * This function handles the intializations which have to be done
> + * only when both sr device and class driver regiter has
> + * completed. This will be attempted to be called from both sr class
> + * driver register and sr device intializtion API's. Only one call
> + * will ultimately succeed.
> + *
> + * Currenly this function registers interrrupt handler for a particular SR
> + * if smartreflex class driver is already registered and has
> + * requested for interrupts and the SR interrupt line in present.
> + */
> +static int sr_late_init(struct omap_sr *sr_info)
> +{
> + char name[SMARTREFLEX_NAME_LEN + 1];
this string is on the stack, but disappears after this function
finished...
> + struct omap_sr_data *pdata = sr_info->pdev->dev.platform_data;
> + int ret = 0;
> +
> + if (sr_class->class_type == SR_CLASS2 &&
> + sr_class->notify_flags && sr_info->irq) {
> +
> + strcpy(name, "sr_");
> + strcat(name, sr_info->voltdm->name);
> + ret = request_irq(sr_info->irq, sr_omap_isr,
> + IRQF_DISABLED, name, (void *)sr_info);
but here, 'name' is passed to request_irq() which just uses a pointer to
it. So after this function terminates, any accesses to that pointer
will be undefined.
> + if (ret) {
> + struct resource *mem;
> +
> + iounmap(sr_info->base);
> + mem = platform_get_resource(sr_info->pdev,
> + IORESOURCE_MEM, 0);
> + release_mem_region(mem->start, resource_size(mem));
> + list_del(&sr_info->node);
> + kfree(sr_info);
> +
> + dev_err(&sr_info->pdev->dev, "%s: ERROR in registering"
> + "interrupt handler. Smartreflex will"
> + "not function as desired\n", __func__);
here you use the sr_info pointer after you free it.
> + return ret;
> + }
> + }
> +
> + if (pdata && pdata->enable_on_init)
> + sr_start_vddautocomp(sr_info);
> +
> + return ret;
> +}
> +
> +static void sr_v1_disable(struct omap_sr *sr)
> +{
> + int timeout = 0;
> +
> + /* Enable MCUDisableAcknowledge interrupt */
> + sr_modify_reg(sr, ERRCONFIG_V1,
> + ERRCONFIG_MCUDISACKINTEN, ERRCONFIG_MCUDISACKINTEN);
> +
> + /* SRCONFIG - disable SR */
> + sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);
> +
> + /* Disable all other SR interrupts and clear the status */
> + sr_modify_reg(sr, ERRCONFIG_V1,
> + (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN |
> + ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_VPBOUNDINTEN_V1),
> + (ERRCONFIG_MCUACCUMINTST | ERRCONFIG_MCUVALIDINTST |
> + ERRCONFIG_MCUBOUNDINTST |
> + ERRCONFIG_VPBOUNDINTST_V1));
> +
> + /*
> + * Wait for SR to be disabled.
> + * wait until ERRCONFIG.MCUDISACKINTST = 1. Typical latency is 1us.
> + */
> + omap_test_timeout((sr_read_reg(sr, ERRCONFIG_V1) &
> + ERRCONFIG_MCUDISACKINTST), SR_DISABLE_TIMEOUT,
> + timeout);
> +
> + if (timeout >= SR_DISABLE_TIMEOUT)
> + dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
> + __func__);
> +
> + /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
> + sr_modify_reg(sr, ERRCONFIG_V1, ERRCONFIG_MCUDISACKINTEN,
> + ERRCONFIG_MCUDISACKINTST);
> +}
> +
> +static void sr_v2_disable(struct omap_sr *sr)
> +{
> + int timeout = 0;
> +
> + /* Enable MCUDisableAcknowledge interrupt */
> + sr_write_reg(sr, IRQENABLE_SET, IRQENABLE_MCUDISABLEACKINT);
> +
> + /* SRCONFIG - disable SR */
> + sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);
> +
> + /* Disable all other SR interrupts and clear the status */
> + sr_modify_reg(sr, ERRCONFIG_V2, ERRCONFIG_VPBOUNDINTEN_V2,
> + ERRCONFIG_VPBOUNDINTST_V2);
> + sr_write_reg(sr, IRQENABLE_CLR, (IRQENABLE_MCUACCUMINT |
> + IRQENABLE_MCUVALIDINT |
> + IRQENABLE_MCUBOUNDSINT));
> + sr_write_reg(sr, IRQSTATUS, (IRQSTATUS_MCUACCUMINT |
> + IRQSTATUS_MCVALIDINT |
> + IRQSTATUS_MCBOUNDSINT));
> +
> + /*
> + * Wait for SR to be disabled.
> + * wait until IRQSTATUS.MCUDISACKINTST = 1. Typical latency is 1us.
> + */
> + omap_test_timeout((sr_read_reg(sr, IRQSTATUS) &
> + IRQSTATUS_MCUDISABLEACKINT), SR_DISABLE_TIMEOUT,
> + timeout);
> +
> + if (timeout >= SR_DISABLE_TIMEOUT)
> + dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",
> + __func__);
> +
> + /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */
> + sr_write_reg(sr, IRQENABLE_CLR, IRQENABLE_MCUDISABLEACKINT);
> + sr_write_reg(sr, IRQSTATUS, IRQSTATUS_MCUDISABLEACKINT);
> +}
> +
> +/* Public Functions */
> +
> +/**
> + * sr_configure_errgen : Configures the smrtreflex to perform AVS using the
minor: common issue with all the kerneldoc headers here, but the correct
format for the first line is:
/**
* foobar() - short function description of foobar
> + * error generator module.
> + * @voltdm - VDD pointer to which the SR module to be configured belongs to.
> + *
> + * This API is to be called from the smartreflex class driver to
> + * configure the error generator module inside the smartreflex module.
> + * SR settings if using the ERROR module inside Smartreflex.
> + * SR CLASS 3 by default uses only the ERROR module where as
> + * SR CLASS 2 can choose between ERROR module and MINMAXAVG
> + * module. Returns 0 on success and error value in case of failure.
> + */
> +int sr_configure_errgen(struct voltagedomain *voltdm)
> +{
> + u32 sr_config, sr_errconfig, errconfig_offs, vpboundint_en;
> + u32 vpboundint_st, senp_en = 0, senn_en = 0;
> + u8 senp_shift, senn_shift;
> + struct omap_sr *sr = _sr_lookup(voltdm);
> + struct omap_sr_data *pdata;
> +
> + if (IS_ERR(sr)) {
> + pr_warning("%s: omap_sr struct for sr_%s not found\n",
> + __func__, voltdm->name);
> + return -EINVAL;
> + }
> +
> + pdata = sr->pdev->dev.platform_data;
> +
> + if (!sr->clk_length)
> + sr_set_clk_length(sr);
> +
> + if (pdata) {
> + senp_en = pdata->senp_mod;
> + senn_en = pdata->senn_mod;
> + } else {
> + dev_warn(&sr->pdev->dev, "%s: Missing pdata\n", __func__);
> + }
> +
> + sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
> + SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN;
> + if (sr->sr_ip_type == SR_TYPE_V1) {
> + sr_config |= SRCONFIG_DELAYCTRL;
> + senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT;
> + senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT;
> + errconfig_offs = ERRCONFIG_V1;
> + vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V1;
> + vpboundint_st = ERRCONFIG_VPBOUNDINTST_V1;
> + } else if (sr->sr_ip_type == SR_TYPE_V2) {
> + senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT;
> + senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT;
> + errconfig_offs = ERRCONFIG_V2;
> + vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V2;
> + vpboundint_st = ERRCONFIG_VPBOUNDINTST_V2;
> + } else {
> + dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
> + "module without specifying the ip\n", __func__);
> + return -EINVAL;
> + }
> + sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift));
> + sr_write_reg(sr, SRCONFIG, sr_config);
> + sr_errconfig = (sr->err_weight << ERRCONFIG_ERRWEIGHT_SHIFT) |
> + (sr->err_maxlimit << ERRCONFIG_ERRMAXLIMIT_SHIFT) |
> + (sr->err_minlimit << ERRCONFIG_ERRMINLIMIT_SHIFT);
> + sr_modify_reg(sr, errconfig_offs, (SR_ERRWEIGHT_MASK |
> + SR_ERRMAXLIMIT_MASK | SR_ERRMINLIMIT_MASK),
> + sr_errconfig);
> + /* Enabling the interrupts if the ERROR module is used */
> + sr_modify_reg(sr, errconfig_offs,
> + vpboundint_en, (vpboundint_en | vpboundint_st));
> + return 0;
> +}
> +
> +/**
> + * sr_configure_minmax : Configures the smrtreflex to perform AVS using the
> + * minmaxavg module.
> + * @voltdm - VDD pointer to which the SR module to be configured belongs to.
> + *
> + * This API is to be called from the smartreflex class driver to
> + * configure the minmaxavg module inside the smartreflex module.
> + * SR settings if using the ERROR module inside Smartreflex.
> + * SR CLASS 3 by default uses only the ERROR module where as
> + * SR CLASS 2 can choose between ERROR module and MINMAXAVG
> + * module. Returns 0 on success and error value in case of failure.
> + */
> +int sr_configure_minmax(struct voltagedomain *voltdm)
> +{
> + u32 sr_config, sr_avgwt;
> + u32 senp_en = 0, senn_en = 0;
> + u8 senp_shift, senn_shift;
> + struct omap_sr *sr = _sr_lookup(voltdm);
> + struct omap_sr_data *pdata;
> +
> + if (IS_ERR(sr)) {
> + pr_warning("%s: omap_sr struct for sr_%s not found\n",
> + __func__, voltdm->name);
> + return -EINVAL;
> + }
> +
> + pdata = sr->pdev->dev.platform_data;
> +
> + if (!sr->clk_length)
> + sr_set_clk_length(sr);
> +
> + if (pdata) {
> + senp_en = pdata->senp_mod;
> + senn_en = pdata->senn_mod;
> + } else {
> + dev_warn(&sr->pdev->dev, "%s: Missing pdata\n", __func__);
> + }
> +
> + sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
> + SRCONFIG_SENENABLE |
> + (sr->accum_data << SRCONFIG_ACCUMDATA_SHIFT);
> + if (sr->sr_ip_type == SR_TYPE_V1) {
> + sr_config |= SRCONFIG_DELAYCTRL;
> + senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT;
> + senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT;
> + } else if (sr->sr_ip_type == SR_TYPE_V2) {
> + senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT;
> + senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT;
> + } else {
> + dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
> + "module without specifying the ip\n", __func__);
> + return -EINVAL;
> + }
> + sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift));
> + sr_write_reg(sr, SRCONFIG, sr_config);
> + sr_avgwt = (sr->senp_avgweight << AVGWEIGHT_SENPAVGWEIGHT_SHIFT) |
> + (sr->senn_avgweight << AVGWEIGHT_SENNAVGWEIGHT_SHIFT);
> + sr_write_reg(sr, AVGWEIGHT, sr_avgwt);
> + /*
> + * Enabling the interrupts if MINMAXAVG module is used.
> + * TODO: check if all the interrupts are mandatory
> + */
> + if (sr->sr_ip_type == SR_TYPE_V1) {
> + sr_modify_reg(sr, ERRCONFIG_V1,
> + (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN |
> + ERRCONFIG_MCUBOUNDINTEN),
> + (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUACCUMINTST |
> + ERRCONFIG_MCUVALIDINTEN | ERRCONFIG_MCUVALIDINTST |
> + ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_MCUBOUNDINTST));
> + } else if (sr->sr_ip_type == SR_TYPE_V2) {
> + sr_write_reg(sr, IRQSTATUS,
> + IRQSTATUS_MCUACCUMINT | IRQSTATUS_MCVALIDINT |
> + IRQSTATUS_MCBOUNDSINT | IRQSTATUS_MCUDISABLEACKINT);
> + sr_write_reg(sr, IRQENABLE_SET,
> + IRQENABLE_MCUACCUMINT | IRQENABLE_MCUVALIDINT |
> + IRQENABLE_MCUBOUNDSINT | IRQENABLE_MCUDISABLEACKINT);
> + }
> + return 0;
> +}
> +
> +/**
> + * sr_enable : Enables the smartreflex module.
> + * @voltdm - VDD pointer to which the SR module to be configured belongs to.
> + * @volt - The voltage at which the Voltage domain associated with
> + * the smartreflex module is operating at. This is required only to program
> + * the correct Ntarget value.
> + *
> + * This API is to be called from the smartreflex class driver to
> + * enable a smartreflex module. Returns 0 on success. Returns error
> + * value if the voltage passed is wrong or if ntarget value is wrong.
> + */
> +int sr_enable(struct voltagedomain *voltdm, unsigned long volt)
> +{
> + u32 nvalue_reciprocal;
> + struct omap_volt_data *volt_data;
> + struct omap_sr *sr = _sr_lookup(voltdm);
> + int ret;
> +
> + if (IS_ERR(sr)) {
> + pr_warning("%s: omap_sr struct for sr_%s not found\n",
> + __func__, voltdm->name);
> + return -EINVAL;
> + }
> +
> + volt_data = omap_voltage_get_voltdata(voltdm, volt);
> +
> + if (IS_ERR(volt_data)) {
> + dev_warn(&sr->pdev->dev, "%s: Unable to get voltage table"
> + " for nominal voltage %ld\n", __func__, volt);
> + return -ENODATA;
> + }
> +
> + nvalue_reciprocal = volt_data->sr_nvalue;
> +
> + if (!nvalue_reciprocal) {
> + dev_warn(&sr->pdev->dev, "%s: NVALUE = 0 at voltage %ld\n",
> + __func__, volt);
> + return -ENODATA;
> + }
> +
> + /* errminlimit is opp dependent and hence linked to voltage */
> + sr->err_minlimit = volt_data->sr_errminlimit;
> +
> + /* Enable the clocks */
> + if (!sr->is_sr_enable) {
> + struct omap_sr_data *pdata = sr->pdev->dev.platform_data;
> +
> + if (pdata && pdata->device_enable) {
> + ret = pdata->device_enable(sr->pdev);
Please use the runtime PM API, which will invoke the omap_device layer.
This should just be a pm_runtime_get_sync()
> + if (ret)
> + return ret;
> + } else {
> + dev_warn(&sr->pdev->dev, "%s: Not able to turn on SR"
> + "clocks during enable. So returning\n",
> + __func__);
> + return -EPERM;
> + }
> + sr->is_sr_enable = 1;
> + }
> +
> + /* Check if SR is already enabled. If yes do nothing */
> + if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE)
> + return 0;
> +
> + /* Configure SR */
> + ret = sr_class->configure(voltdm);
> + if (ret)
> + return ret;
> +
> + sr_write_reg(sr, NVALUERECIPROCAL, nvalue_reciprocal);
> + /* SRCONFIG - enable SR */
> + sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, SRCONFIG_SRENABLE);
> + return 0;
> +}
> +
> +/**
> + * sr_disable : Disables the smartreflex module.
> + * @voltdm - VDD pointer to which the SR module to be configured belongs to.
> + *
> + * This API is to be called from the smartreflex class driver to
> + * disable a smartreflex module.
> + */
> +void sr_disable(struct voltagedomain *voltdm)
> +{
> + struct omap_sr *sr = _sr_lookup(voltdm);
> + struct omap_sr_data *pdata;
> +
> + if (IS_ERR(sr)) {
> + pr_warning("%s: omap_sr struct for sr_%s not found\n",
> + __func__, voltdm->name);
> + return;
> + }
> +
> + /* Check if SR clocks are already disabled. If yes do nothing */
> + if (!sr->is_sr_enable)
> + return;
> +
> + /* Check if SR is already disabled. If yes just disable the clocks */
> + if (!(sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE))
> + goto disable_clocks;
> +
> + if (sr->sr_ip_type == SR_TYPE_V1)
> + sr_v1_disable(sr);
> + else if (sr->sr_ip_type == SR_TYPE_V2)
> + sr_v2_disable(sr);
> +
> +disable_clocks:
> + pdata = sr->pdev->dev.platform_data;
> + if (pdata && pdata->device_idle) {
> + pdata->device_idle(sr->pdev);
> + } else {
> + dev_warn(&sr->pdev->dev, "%s: Unable to turn off clocks"
> + "during SR disable\n", __func__);
> + return;
> + }
and this should be a pm_runtime_put()
> + sr->is_sr_enable = 0;
> +}
> +
> +/**
> + * omap_smartreflex_enable : API to enable SR clocks and to call into the
> + * registered smartreflex class enable API.
> + * @voltdm - VDD pointer to which the SR module to be configured belongs to.
> + *
> + * This API is to be called from the kernel in order to enable
> + * a particular smartreflex module. This API will do the initial
> + * configurations to turn on the smartreflex module and in turn call
> + * into the registered smartreflex class enable API.
> + */
> +void omap_smartreflex_enable(struct voltagedomain *voltdm)
> +{
> + struct omap_sr *sr = _sr_lookup(voltdm);
> +
> + if (IS_ERR(sr)) {
> + pr_warning("%s: omap_sr struct for sr_%s not found\n",
> + __func__, voltdm->name);
> + return;
> + }
> +
> + if (!sr->is_autocomp_active)
> + return;
from here
> + if (!sr_class || !(sr_class->enable) || !(sr_class->configure)) {
> + dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
> + "registered\n", __func__);
> + return;
> + }
> + sr_class->enable(voltdm);
to here, this looks an awful lot like sr_start_autocomp()
> +}
> +
> +/**
> + * omap_smartreflex_disable : API to disable SR without resetting the voltage
> + * processor voltage
> + * @voltdm - VDD pointer to which the SR module to be configured belongs to.
> + *
> + * This API is to be called from the kernel in order to disable
> + * a particular smartreflex module. This API will in turn call
> + * into the registered smartreflex class disable API. This API will tell
> + * the smartreflex class disable not to reset the VP voltage after
> + * disabling smartreflex.
> + */
> +void omap_smartreflex_disable(struct voltagedomain *voltdm)
> +{
> + struct omap_sr *sr = _sr_lookup(voltdm);
> +
> + if (IS_ERR(sr)) {
> + pr_warning("%s: omap_sr struct for sr_%s not found\n",
> + __func__, voltdm->name);
> + return;
> + }
> +
> + if (!sr->is_autocomp_active)
> + return;
> +
> + if (!sr_class || !(sr_class->disable)) {
> + dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
> + "registered\n", __func__);
> + return;
> + }
> +
> + sr_class->disable(voltdm, 0);
likewise for sr_stop_autocomp.
> +}
> +/**
> + * omap_smartreflex_disable_reset_volt : API to disable SR and reset the
> + * voltage processor voltage
> + * @voltdm - VDD pointer to which the SR module to be configured belongs to.
> + *
> + * This API is to be called from the kernel in order to disable
> + * a particular smartreflex module. This API will in turn call
> + * into the registered smartreflex class disable API. This API will tell
> + * the smartreflex class disable to reset the VP voltage after
> + * disabling smartreflex.
> + */
> +void omap_smartreflex_disable_reset_volt(struct voltagedomain *voltdm)
> +{
> + struct omap_sr *sr = _sr_lookup(voltdm);
> +
> + if (IS_ERR(sr)) {
> + pr_warning("%s: omap_sr struct for sr_%s not found\n",
> + __func__, voltdm->name);
> + return;
> + }
> +
> + if (!sr->is_autocomp_active)
> + return;
> +
> + if (!sr_class || !(sr_class->disable)) {
> + dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
> + "registered\n", __func__);
> + return;
> + }
> +
> + sr_class->disable(voltdm, 1);
> +}
> +
> +/**
> + * omap_sr_register_class : API to register a smartreflex class parameters.
> + * @class_data - The structure containing various sr class specific data.
> + *
> + * This API is to be called by the smartreflex class driver to register itself
> + * with the smartreflex driver during init. Returns 0 on success else the
> + * error value.
> + */
> +int omap_sr_register_class(struct omap_smartreflex_class_data *class_data)
> +{
> + struct omap_sr *sr_info;
> +
> + if (!class_data) {
> + pr_warning("%s:, Smartreflex class data passed is NULL\n",
> + __func__);
> + return -EINVAL;
> + }
> +
> + if (sr_class) {
> + pr_warning("%s: Smartreflex class driver already registered\n",
> + __func__);
> + return -EBUSY;
> + }
> +
> + sr_class = class_data;
> +
> + /*
> + * Call into late init to do intializations that require
> + * both sr driver and sr class driver to be initiallized.
> + */
> + list_for_each_entry(sr_info, &sr_list, node)
> + sr_late_init(sr_info);
> + return 0;
> +}
> +
> +/**
> + * omap_sr_register_pmic : API to register pmic specific info.
> + * @pmic_data - The structure containing pmic specific data.
> + *
> + * This API is to be called from the PMIC specific code to register with
> + * smartreflex driver pmic specific info. Currently the only info required
> + * is the smartreflex init on the PMIC side.
> + */
> +void omap_sr_register_pmic(struct omap_smartreflex_pmic_data *pmic_data)
> +{
> + if (!pmic_data) {
> + pr_warning("%s: Trying to register NULL PMIC data structure"
> + "with smartreflex\n", __func__);
> + return;
> + }
> + sr_pmic_data = pmic_data;
> +}
> +
> +#ifdef CONFIG_PM_DEBUG
> +/* PM Debug Fs enteries to enable disable smartreflex. */
> +static int omap_sr_autocomp_show(void *data, u64 *val)
> +{
> + struct omap_sr *sr_info = (struct omap_sr *) data;
> +
> + if (!sr_info) {
> + pr_warning("%s: omap_sr struct for sr_%s not found\n",
> + __func__, sr_info->voltdm->name);
> + return -EINVAL;
> + }
> + *val = sr_info->is_autocomp_active;
> + return 0;
> +}
> +
> +static int omap_sr_autocomp_store(void *data, u64 val)
> +{
> + struct omap_sr *sr_info = (struct omap_sr *) data;
> +
> + if (!sr_info) {
> + pr_warning("%s: omap_sr struct for sr_%s not found\n",
> + __func__, sr_info->voltdm->name);
> + return -EINVAL;
> + }
> +
> + /* Sanity check */
> + if (val && (val != 1)) {
> + pr_warning("%s: Invalid argument %lld\n", __func__, val);
> + return -EINVAL;
> + }
> +
> + if (!val)
> + sr_stop_vddautocomp(sr_info);
> + else
> + sr_start_vddautocomp(sr_info);
> + return 0;
> +}
> +
> +DEFINE_SIMPLE_ATTRIBUTE(pm_sr_fops, omap_sr_autocomp_show,
> + omap_sr_autocomp_store, "%llu\n");
> +#endif
> +
> +static int __init omap_smartreflex_probe(struct platform_device *pdev)
> +{
> + struct omap_sr *sr_info = kzalloc(sizeof(struct omap_sr), GFP_KERNEL);
> + struct omap_device *odev = to_omap_device(pdev);
> + struct omap_sr_data *pdata = pdev->dev.platform_data;
> + struct resource *mem, *irq;
> + int ret = 0;
> +#ifdef CONFIG_PM_DEBUG
> + char name[SMARTREFLEX_NAME_LEN + 1];
> + struct dentry *dbg_dir;
> +#endif
> +
> + if (!sr_info) {
> + dev_err(&pdev->dev, "%s: unable to allocate sr_info\n",
> + __func__);
> + return -ENOMEM;
> + }
> +
> + if (!pdata) {
> + dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
> + return -EINVAL;
> + }
> +
> + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!mem) {
> + dev_err(&pdev->dev, "%s: no mem resource\n", __func__);
> + ret = -ENODEV;
> + goto err_free_devinfo;
> + }
> + irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> +
> + sr_info->pdev = pdev;
> + sr_info->srid = pdev->id;
> + sr_info->voltdm = pdata->voltdm;
> + sr_info->is_autocomp_active = 0;
> + sr_info->clk_length = 0;
minor: setting to zero isn't needed due to kzalloc above.
> + sr_info->sr_ip_type = odev->hwmods[0]->class->rev;
> + sr_info->base = ioremap(mem->start, resource_size(mem));
> + if (!sr_info->base) {
> + dev_err(&pdev->dev, "%s: ioremap fail\n", __func__);
> + ret = -ENOMEM;
> + goto err_release_region;
> + }
> + if (irq)
> + sr_info->irq = irq->start;
> + sr_set_clk_length(sr_info);
> + sr_set_regfields(sr_info);
> +
> + list_add(&sr_info->node, &sr_list);
> + /*
> + * Call into late init to do intializations that require
> + * both sr driver and sr class driver to be initiallized.
> + */
> + if (sr_class) {
> + ret = sr_late_init(sr_info);
> + if (ret) {
> + pr_warning("%s: Error in SR late init\n", __func__);
> + return ret;
> + }
> + }
> +
> +#ifdef CONFIG_PM_DEBUG
this depends on debugfs support too. Also, please read the
"#ifdefs are ugly" section of Documentation/SubmittingPatches in order
to get rid of the #ifdefs in the main code flow.
> + /* Create the debug fs enteries */
> + strcpy(name, "sr_");
> + strcat(name, sr_info->voltdm->name);
> + dbg_dir = debugfs_create_dir(name, sr_dbg_dir);
again, 'name' is on the stack and will disappear. You should double
check the debugfs layer, but I doubt that it makes a copy of this
string.
> + (void) debugfs_create_file("autocomp", S_IRUGO | S_IWUGO, dbg_dir,
> + (void *)sr_info, &pm_sr_fops);
> +#endif
> +
> + dev_info(&pdev->dev, "%s: SmartReflex driver initialized\n", __func__);
> + return ret;
> +
> +err_release_region:
> + release_mem_region(mem->start, resource_size(mem));
> +err_free_devinfo:
> + kfree(sr_info);
> +
> + return ret;
> +}
> +
> +static int __devexit omap_smartreflex_remove(struct platform_device *pdev)
> +{
> + struct omap_sr_data *pdata = pdev->dev.platform_data;
> + struct omap_sr *sr_info;
> + struct resource *mem;
> +
> + if (!pdata) {
> + dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
> + return -EINVAL;
> + }
> +
> + sr_info = _sr_lookup(pdata->voltdm);
> + if (!sr_info) {
> + dev_warn(&pdev->dev, "%s: omap_sr struct not found\n",
> + __func__);
> + return -EINVAL;
> + }
> +
> + /* Disable Autocompensation if enabled before removing the module */
> + if (sr_info->is_autocomp_active == 1)
> + sr_stop_vddautocomp(sr_info);
> +
> + list_del(&sr_info->node);
> + iounmap(sr_info->base);
> + kfree(sr_info);
> + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + release_mem_region(mem->start, resource_size(mem));
> + return 0;
> +}
> +
> +static struct platform_driver smartreflex_driver = {
> + .remove = omap_smartreflex_remove,
> + .driver = {
> + .name = "smartreflex",
> + },
> +};
> +
> +static int __init sr_init(void)
> +{
> + int ret = 0;
> +
> + /*
> + * sr_init is a late init. If by then a pmic specific API is not
> + * registered either there is no need for anything to be done
... or?
> + */
> + if (sr_pmic_data && sr_pmic_data->sr_pmic_init)
> + sr_pmic_data->sr_pmic_init();
> + else
> + pr_warning("%s: No PMIC hook to init smartreflex\n", __func__);
> +
> +#ifdef CONFIG_PM_DEBUG
> + sr_dbg_dir = debugfs_create_dir("smartreflex", pm_dbg_main_dir);
> +#endif
Please see "#ifdefs are ugly" section of
Documentation/SubmittingPatches.
> + ret = platform_driver_probe(&smartreflex_driver,
> + omap_smartreflex_probe);
> + if (ret) {
> + pr_err("%s: platform driver register failed for SR\n",
> + __func__);
> + return ret;
> + }
> + return 0;
> +}
> +
> +static void __exit sr_exit(void)
> +{
> + platform_driver_unregister(&smartreflex_driver);
> +}
> +late_initcall(sr_init);
> +module_exit(sr_exit);
> +
> +MODULE_DESCRIPTION("OMAP SMARTREFLEX DRIVER");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:" DRIVER_NAME);
> +MODULE_AUTHOR("Texas Instruments Inc");
> diff --git a/arch/arm/plat-omap/Kconfig b/arch/arm/plat-omap/Kconfig
> index e39a417..8056349 100644
> --- a/arch/arm/plat-omap/Kconfig
> +++ b/arch/arm/plat-omap/Kconfig
> @@ -35,6 +35,38 @@ config OMAP_DEBUG_LEDS
> depends on OMAP_DEBUG_DEVICES
> default y if LEDS
>
> +config OMAP_SMARTREFLEX
> + bool "SmartReflex support"
> + depends on ARCH_OMAP3 && PM
> + help
> + Say Y if you want to enable SmartReflex.
> +
> + SmartReflex can perform continuous dynamic voltage
> + scaling around the nominal operating point voltage
> + according to silicon characteristics and operating
> + conditions. Enabling SmartReflex reduces power
> + consumption.
> +
> + Please note, that by default SmartReflex is only
> + initialized. To enable the automatic voltage
> + compensation for VDD1 and VDD2, user must write 1 to
> + /debug/pm_debug/Smartreflex/SR<X>/autocomp,
> + where X is 1 or 2 for OMAP3
> +
> +config OMAP_SMARTREFLEX_TESTING
> + bool "Smartreflex testing support"
> + depends on OMAP_SMARTREFLEX
> + default n
> + help
> + Say Y if you want to enable SmartReflex testing with SW hardcoded
> + NVALUES intead of E-fuse NVALUES set in factory silicon testing.
> +
> + In some devices the E-fuse values have not been set, even though
> + SmartReflex modules are included. Using these hardcoded values set
> + in software, one can test the SmartReflex features without E-fuse.
> +
> + WARNING: Enabling this option may cause your device to hang!
> +
> config OMAP_RESET_CLOCKS
> bool "Reset unused clocks during boot"
> depends on ARCH_OMAP
> diff --git a/arch/arm/plat-omap/include/plat/smartreflex.h b/arch/arm/plat-omap/include/plat/smartreflex.h
> new file mode 100644
> index 0000000..8954c86
> --- /dev/null
> +++ b/arch/arm/plat-omap/include/plat/smartreflex.h
> @@ -0,0 +1,286 @@
> +/*
> + * OMAP Smartreflex Defines and Routines
> + *
> + * Author: Thara Gopinath <thara@xxxxxx>
> + *
> + * Copyright (C) 2010 Texas Instruments, Inc.
> + * Thara Gopinath <thara@xxxxxx>
> + *
> + * Copyright (C) 2008 Nokia Corporation
> + * Kalle Jokiniemi
> + *
> + * Copyright (C) 2007 Texas Instruments, Inc.
> + * Lesly A M <x0080970@xxxxxx>
> + *
> + * 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.
> + */
> +
> +#ifndef __ASM_ARM_OMAP_SMARTREFLEX_H
> +#define __ASM_ARM_OMAP_SMARTREFLEX_H
> +
> +#include <linux/platform_device.h>
> +#include <plat/voltage.h>
> +
> +#ifdef CONFIG_PM_DEBUG
> +extern struct dentry *pm_dbg_main_dir;
> +extern struct dentry *sr_dbg_dir;
> +#endif
> +
> +/*
> + * Different Smartreflex IPs version. The v1 is the 65nm version used in
> + * OMAP3430. The v2 is the update for the 45nm version of the IP
> + * used in OMAP3630 and OMAP4430
> + */
> +#define SR_TYPE_V1 1
> +#define SR_TYPE_V2 2
> +
> +/* SMART REFLEX REG ADDRESS OFFSET */
> +#define SRCONFIG 0x00
> +#define SRSTATUS 0x04
> +#define SENVAL 0x08
> +#define SENMIN 0x0C
> +#define SENMAX 0x10
> +#define SENAVG 0x14
> +#define AVGWEIGHT 0x18
> +#define NVALUERECIPROCAL 0x1C
> +#define SENERROR_V1 0x20
> +#define ERRCONFIG_V1 0x24
> +#define IRQ_EOI 0x20
> +#define IRQSTATUS_RAW 0x24
> +#define IRQSTATUS 0x28
> +#define IRQENABLE_SET 0x2C
> +#define IRQENABLE_CLR 0x30
> +#define SENERROR_V2 0x34
> +#define ERRCONFIG_V2 0x38
> +
> +/* Bit/Shift Positions */
> +
> +/* SRCONFIG */
> +#define SRCONFIG_ACCUMDATA_SHIFT 22
> +#define SRCONFIG_SRCLKLENGTH_SHIFT 12
> +#define SRCONFIG_SENNENABLE_V1_SHIFT 5
> +#define SRCONFIG_SENPENABLE_V1_SHIFT 3
> +#define SRCONFIG_SENNENABLE_V2_SHIFT 1
> +#define SRCONFIG_SENPENABLE_V2_SHIFT 0
> +#define SRCONFIG_CLKCTRL_SHIFT 0
> +
> +#define SRCONFIG_ACCUMDATA_MASK (0x3FF << 22)
> +
> +#define SRCONFIG_SRENABLE BIT(11)
> +#define SRCONFIG_SENENABLE BIT(10)
> +#define SRCONFIG_ERRGEN_EN BIT(9)
> +#define SRCONFIG_MINMAXAVG_EN BIT(8)
> +#define SRCONFIG_DELAYCTRL BIT(2)
> +
> +/* AVGWEIGHT */
> +#define AVGWEIGHT_SENPAVGWEIGHT_SHIFT 2
> +#define AVGWEIGHT_SENNAVGWEIGHT_SHIFT 0
> +
> +/* NVALUERECIPROCAL */
> +#define NVALUERECIPROCAL_SENPGAIN_SHIFT 20
> +#define NVALUERECIPROCAL_SENNGAIN_SHIFT 16
> +#define NVALUERECIPROCAL_RNSENP_SHIFT 8
> +#define NVALUERECIPROCAL_RNSENN_SHIFT 0
> +
> +/* ERRCONFIG */
> +#define ERRCONFIG_ERRWEIGHT_SHIFT 16
> +#define ERRCONFIG_ERRMAXLIMIT_SHIFT 8
> +#define ERRCONFIG_ERRMINLIMIT_SHIFT 0
> +
> +#define SR_ERRWEIGHT_MASK (0x07 << 16)
> +#define SR_ERRMAXLIMIT_MASK (0xFF << 8)
> +#define SR_ERRMINLIMIT_MASK (0xFF << 0)
> +
> +#define ERRCONFIG_VPBOUNDINTEN_V1 BIT(31)
> +#define ERRCONFIG_VPBOUNDINTST_V1 BIT(30)
> +#define ERRCONFIG_MCUACCUMINTEN BIT(29)
> +#define ERRCONFIG_MCUACCUMINTST BIT(28)
> +#define ERRCONFIG_MCUVALIDINTEN BIT(27)
> +#define ERRCONFIG_MCUVALIDINTST BIT(26)
> +#define ERRCONFIG_MCUBOUNDINTEN BIT(25)
> +#define ERRCONFIG_MCUBOUNDINTST BIT(24)
> +#define ERRCONFIG_MCUDISACKINTEN BIT(23)
> +#define ERRCONFIG_VPBOUNDINTST_V2 BIT(23)
> +#define ERRCONFIG_MCUDISACKINTST BIT(22)
> +#define ERRCONFIG_VPBOUNDINTEN_V2 BIT(22)
> +
> +#define ERRCONFIG_STATUS_V1_MASK (ERRCONFIG_VPBOUNDINTST_V1 | \
> + ERRCONFIG_MCUACCUMINTST | \
> + ERRCONFIG_MCUVALIDINTST | \
> + ERRCONFIG_MCUBOUNDINTST | \
> + ERRCONFIG_MCUDISACKINTST)
> +/* IRQSTATUS */
> +#define IRQSTATUS_MCUACCUMINT BIT(3)
> +#define IRQSTATUS_MCVALIDINT BIT(2)
> +#define IRQSTATUS_MCBOUNDSINT BIT(1)
> +#define IRQSTATUS_MCUDISABLEACKINT BIT(0)
> +
> +/* IRQENABLE_SET and IRQENABLE_CLEAR */
> +#define IRQENABLE_MCUACCUMINT BIT(3)
> +#define IRQENABLE_MCUVALIDINT BIT(2)
> +#define IRQENABLE_MCUBOUNDSINT BIT(1)
> +#define IRQENABLE_MCUDISABLEACKINT BIT(0)
> +
> +/* Common Bit values */
> +
> +#define SRCLKLENGTH_12MHZ_SYSCLK 0x3C
> +#define SRCLKLENGTH_13MHZ_SYSCLK 0x41
> +#define SRCLKLENGTH_19MHZ_SYSCLK 0x60
> +#define SRCLKLENGTH_26MHZ_SYSCLK 0x82
> +#define SRCLKLENGTH_38MHZ_SYSCLK 0xC0
> +
> +/*
> + * 3430 specific values. Maybe these should be passed from board file or
> + * pmic structures.
> + */
> +#define OMAP3430_SR_ACCUMDATA 0x1F4
minor: use lower-case letters in hex numbers
> +#define OMAP3430_SR1_SENPAVGWEIGHT 0x03
> +#define OMAP3430_SR1_SENNAVGWEIGHT 0x03
> +
> +#define OMAP3430_SR2_SENPAVGWEIGHT 0x01
> +#define OMAP3430_SR2_SENNAVGWEIGHT 0x01
> +
> +#define OMAP3430_SR_ERRWEIGHT 0x04
> +#define OMAP3430_SR_ERRMAXLIMIT 0x02
> +
> +/* TODO:3630/OMAP4 values if it has to come from this file */
> +
> +#ifdef CONFIG_OMAP_SMARTREFLEX_TESTING
> +#define SR_TESTING_NVALUES 1
> +#else
> +#define SR_TESTING_NVALUES 0
> +#endif
This is just a new define with the same values as the original define.
Just drop this, and in the code, do:
#ifdef CONFIG_OMAP_SMARTREFLEX_TESTING
static void __init sr_set_nvalues(struct omap_sr_dev_data *dev_data,
struct omap_sr_data *sr_data)
{
/* function body here */
}
else
static void __init sr_set_nvalues(struct omap_sr_dev_data *dev_data,
struct omap_sr_data *sr_data) {}
#endif
> +/**
> + * omap_smartreflex_dev_data - Smartreflex device specific data
> + *
> + * @volts_supported : Number of distinct voltages possible for the VDD
> + * associated with this smartreflex module.
> + * @efuse_sr_control : The regisrter offset of control_fuse_sr efuse
> + * register from which sennenable and senpenable values
> + * are obtained.
> + * @sennenable_shift : The shift in the control_fuse_sr register for
> + * obtaining the sennenable value for this smartreflex
> + * module.
> + * @senpenable_shift : The shift in the control_fuse_sr register for
> + * obtaining the senpenable value for this smartreflex
> + * module.
> + * @efuse_nvalues_offs : Array of efuse offsets from which ntarget values can
> + * be retrieved. Number of efuse offsets in this arrray
> + * is equal to the volts_supported value ie one efuse
> + * register per supported voltage.
> + * @test_sennenable : SENNENABLE test value
> + * @test_senpenable : SENPENABLE test value.
> + * @test_nvalues : Array of test ntarget values.
> + * @vdd_name : Name of the voltage domain associated with this
> + * Smartreflex device.
> + * @volt_data : Voltage table associated with this smartreflex module
> + */
> +struct omap_sr_dev_data {
> + int volts_supported;
> + u32 efuse_sr_control;
> + u32 sennenable_shift;
> + u32 senpenable_shift;
> + u32 *efuse_nvalues_offs;
> + u32 test_sennenable;
> + u32 test_senpenable;
> + u32 *test_nvalues;
> + char *vdd_name;
> + struct omap_volt_data *volt_data;
> +};
> +
> +/**
> + * omap_smartreflex_pmic_data : Strucutre to be populated by pmic code to pass
> + * pmic specific info to smartreflex driver
> + *
> + * @sr_pmic_init - API to initialize smartreflex on the PMIC side.
> + */
> +struct omap_smartreflex_pmic_data {
> + void (*sr_pmic_init) (void);
> +};
> +
> +#ifdef CONFIG_OMAP_SMARTREFLEX
> +/*
> + * The smart reflex driver supports CLASS1 CLASS2 and CLASS3 SR.
> + * The smartreflex class driver should pass the class type.
> + * Should be used to populate the class_type field of the
> + * omap_smartreflex_class_data structure.
> + */
> +#define SR_CLASS1 0x1
> +#define SR_CLASS2 0x2
> +#define SR_CLASS3 0x3
> +
> +/**
> + * omap_smartreflex_class_data : Structure to be populated by
> + * Smartreflex class driver with corresponding class enable disable API's
> + *
> + * @enable - API to enable a particular class smaartreflex.
> + * @disable - API to disable a particular class smartreflex.
> + * @configure - API to configure a particular class smartreflex.
> + * @notify - API to notify the class driver about an event in SR. Not needed
> + * for class3.
> + * @notify_flags - specify the events to be notified to the class driver
> + * @class_type - specify which smartreflex class. Can be used by the SR driver
> + * to take any class based decisions.
> + */
> +struct omap_smartreflex_class_data {
> + int (*enable)(struct voltagedomain *voltdm);
> + int (*disable)(struct voltagedomain *voltdm, int is_volt_reset);
> + int (*configure)(struct voltagedomain *voltdm);
> + int (*notify)(struct voltagedomain *voltdm, u32 status);
> + u8 notify_flags;
> + u8 class_type;
> +};
> +
> +/**
> + * omap_smartreflex_data - Smartreflex platform data
> + *
> + * @senp_mod : SENPENABLE value for the sr
> + * @senn_mod : SENNENABLE value for sr
> + * @sr_nvalue : array of n target values for sr
> + * @enable_on_init : whether this sr module needs to enabled at
> + * boot up or not.
> + * @voltdm : Pointer to the voltage domain associated with the SR
> + */
> +struct omap_sr_data {
> + u32 senp_mod;
> + u32 senn_mod;
> + bool enable_on_init;
> + struct voltagedomain *voltdm;
> + int (*device_enable)(struct platform_device *pdev);
> + int (*device_shutdown)(struct platform_device *pdev);
> + int (*device_idle)(struct platform_device *pdev);
These function pointers should all be dropped in favor of using the
runtime PM API.
> +};
> +
> +/*
> + * Smartreflex module enable/disable interface.
> + * NOTE: if smartreflex is not enabled from sysfs, these functions will not
> + * do anything.
> + */
> +void omap_smartreflex_enable(struct voltagedomain *voltdm);
> +void omap_smartreflex_disable(struct voltagedomain *voltdm);
> +void omap_smartreflex_disable_reset_volt(struct voltagedomain *voltdm);
> +
> +/* Smartreflex driver hooks to be called from Smartreflex class driver */
> +int sr_enable(struct voltagedomain *voltdm, unsigned long volt);
> +void sr_disable(struct voltagedomain *voltdm);
> +int sr_configure_errgen(struct voltagedomain *voltdm);
> +int sr_configure_minmax(struct voltagedomain *voltdm);
> +
> +/* API to register the smartreflex class driver with the smartreflex driver */
> +int omap_sr_register_class(struct omap_smartreflex_class_data *class_data);
> +
> +/* API to register the pmic specific data with the smartreflex driver. */
> +void omap_sr_register_pmic(struct omap_smartreflex_pmic_data *pmic_data);
> +#else
> +static inline void omap_smartreflex_enable(struct voltagedomain *voltdm) {}
> +static inline void omap_smartreflex_disable(struct voltagedomain *voltdm) {}
> +static inline void omap_smartreflex_disable_reset_volt(
> + struct voltagedomain *voltdm) {}
> +static inline void omap_sr_register_pmic(
> + struct omap_smartreflex_pmic_data *pmic_data) {}
> +#endif
> +#endif
These function names could all be unified a bit better. Some are
'omap_smartreflex_', some are 'sr_' and some are 'omap_sr'.
How about using 'omap_sr' for all the public functions.
Kevin
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