/* * OMAP SmartReflex Voltage Control * * Author: Thara Gopinath <thara@ti.com> * * Copyright (C) 2010 Texas Instruments, Inc. * Thara Gopinath <thara@ti.com> * * Copyright (C) 2008 Nokia Corporation * Kalle Jokiniemi * * Copyright (C) 2007 Texas Instruments, Inc. * Lesly A M <x0080970@ti.com> * * 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/module.h> #include <linux/interrupt.h> #include <linux/clk.h> #include <linux/io.h> #include <linux/debugfs.h> #include <linux/delay.h> #include <linux/slab.h> #include <linux/pm_runtime.h> #include "common.h" #include "pm.h" #include "smartreflex.h" #define SMARTREFLEX_NAME_LEN 16 #define NVALUE_NAME_LEN 40 #define SR_DISABLE_TIMEOUT 200 struct omap_sr { int srid; int ip_type; int nvalue_count; bool autocomp_active; u32 clk_length; u32 err_weight; u32 err_minlimit; u32 err_maxlimit; u32 accum_data; u32 senn_avgweight; u32 senp_avgweight; u32 senp_mod; u32 senn_mod; unsigned int irq; void __iomem *base; struct platform_device *pdev; struct list_head node; struct omap_sr_nvalue_table *nvalue_table; struct voltagedomain *voltdm; struct dentry *dbg_dir; }; /* sr_list contains all the instances of smartreflex module */ static LIST_HEAD(sr_list); static struct omap_sr_class_data *sr_class; static struct omap_sr_pmic_data *sr_pmic_data; static struct dentry *sr_dbg_dir; 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 = 0, errconfig_mask = 0; reg_val = __raw_readl(sr->base + offset); reg_val &= ~mask; /* * 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. This mean this API doesn't rewrite values in these bits * if they are currently set, but does allow the caller to write * those bits. */ if (sr->ip_type == SR_TYPE_V1) { errconfig_offs = ERRCONFIG_V1; errconfig_mask = ERRCONFIG_STATUS_V1_MASK; } else if (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_interrupt(int irq, void *data) { struct omap_sr *sr_info = (struct omap_sr *)data; u32 status = 0; if (sr_info->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->ip_type == SR_TYPE_V2) { /* Read the status bits */ status = sr_read_reg(sr_info, IRQSTATUS); /* Clear them by writing back */ sr_write_reg(sr_info, IRQSTATUS, status); } if (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; if (cpu_is_omap34xx()) sys_ck = clk_get(NULL, "sys_ck"); else sys_ck = clk_get(NULL, "sys_clkin_ck"); if (IS_ERR(sys_ck)) { dev_err(&sr->pdev->dev, "%s: unable to get sys clk\n", __func__); return; } sys_clk_speed = clk_get_rate(sys_ck); 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() || cpu_is_omap44xx()) { 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; } } } 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__); return; } if (!sr_class->enable(sr->voltdm)) sr->autocomp_active = true; } 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->autocomp_active) { sr_class->disable(sr->voltdm, 1); sr->autocomp_active = false; } } /* * 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. * * Currently this function registers interrupt 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; struct omap_sr_data *pdata = sr_info->pdev->dev.platform_data; struct resource *mem; int ret = 0; if (sr_class->notify && sr_class->notify_flags && sr_info->irq) { name = kasprintf(GFP_KERNEL, "sr_%s", sr_info->voltdm->name); if (name == NULL) { ret = -ENOMEM; goto error; } ret = request_irq(sr_info->irq, sr_interrupt, 0, name, (void *)sr_info); if (ret) goto error; disable_irq(sr_info->irq); } if (pdata && pdata->enable_on_init) sr_start_vddautocomp(sr_info); return ret; error: 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); dev_err(&sr_info->pdev->dev, "%s: ERROR in registering" "interrupt handler. Smartreflex will" "not function as desired\n", __func__); kfree(name); kfree(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); } static u32 sr_retrieve_nvalue(struct omap_sr *sr, u32 efuse_offs) { int i; if (!sr->nvalue_table) { dev_warn(&sr->pdev->dev, "%s: Missing ntarget value table\n", __func__); return 0; } for (i = 0; i < sr->nvalue_count; i++) { if (sr->nvalue_table[i].efuse_offs == efuse_offs) return sr->nvalue_table[i].nvalue; } return 0; } /* Public Functions */ /** * sr_configure_errgen() - Configures the smrtreflex to perform AVS using the * 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); if (IS_ERR(sr)) { pr_warning("%s: omap_sr struct for sr_%s not found\n", __func__, voltdm->name); return -EINVAL; } if (!sr->clk_length) sr_set_clk_length(sr); senp_en = sr->senp_mod; senn_en = sr->senn_mod; sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) | SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN; if (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->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); if (IS_ERR(sr)) { pr_warning("%s: omap_sr struct for sr_%s not found\n", __func__, voltdm->name); return -EINVAL; } if (!sr->clk_length) sr_set_clk_length(sr); senp_en = sr->senp_mod; senn_en = sr->senn_mod; sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) | SRCONFIG_SENENABLE | (sr->accum_data << SRCONFIG_ACCUMDATA_SHIFT); if (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->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->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->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(sr->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 = sr_retrieve_nvalue(sr, volt_data->sr_efuse_offs); 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; pm_runtime_get_sync(&sr->pdev->dev); /* 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); 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 (pm_runtime_suspended(&sr->pdev->dev)) return; /* * Disable SR if only it is indeed enabled. Else just * disable the clocks. */ if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE) { if (sr->ip_type == SR_TYPE_V1) sr_v1_disable(sr); else if (sr->ip_type == SR_TYPE_V2) sr_v2_disable(sr); } pm_runtime_put_sync_suspend(&sr->pdev->dev); } /** * 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 sr_register_class(struct omap_sr_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_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_sr_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->autocomp_active) return; 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); } /** * omap_sr_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_sr_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->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); } /** * omap_sr_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_sr_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->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_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_sr_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; } /* 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 not found\n", __func__); return -EINVAL; } *val = sr_info->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 not found\n", __func__); return -EINVAL; } /* Sanity check */ if (val && (val != 1)) { pr_warning("%s: Invalid argument %lld\n", __func__, val); return -EINVAL; } /* control enable/disable only if there is a delta in value */ if (sr_info->autocomp_active != val) { 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"); static int __init omap_sr_probe(struct platform_device *pdev) { struct omap_sr *sr_info = kzalloc(sizeof(struct omap_sr), GFP_KERNEL); struct omap_sr_data *pdata = pdev->dev.platform_data; struct resource *mem, *irq; struct dentry *nvalue_dir; struct omap_volt_data *volt_data; int i, ret = 0; char *name; 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__); ret = -EINVAL; goto err_free_devinfo; } 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; } mem = request_mem_region(mem->start, resource_size(mem), dev_name(&pdev->dev)); if (!mem) { dev_err(&pdev->dev, "%s: no mem region\n", __func__); ret = -EBUSY; goto err_free_devinfo; } irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); pm_runtime_enable(&pdev->dev); pm_runtime_irq_safe(&pdev->dev); sr_info->pdev = pdev; sr_info->srid = pdev->id; sr_info->voltdm = pdata->voltdm; sr_info->nvalue_table = pdata->nvalue_table; sr_info->nvalue_count = pdata->nvalue_count; sr_info->senn_mod = pdata->senn_mod; sr_info->senp_mod = pdata->senp_mod; sr_info->autocomp_active = false; sr_info->ip_type = pdata->ip_type; 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; } } dev_info(&pdev->dev, "%s: SmartReflex driver initialized\n", __func__); if (!sr_dbg_dir) { sr_dbg_dir = debugfs_create_dir("smartreflex", NULL); if (!sr_dbg_dir) { ret = PTR_ERR(sr_dbg_dir); pr_err("%s:sr debugfs dir creation failed(%d)\n", __func__, ret); goto err_iounmap; } } name = kasprintf(GFP_KERNEL, "sr_%s", sr_info->voltdm->name); if (!name) { dev_err(&pdev->dev, "%s: Unable to alloc debugfs name\n", __func__); ret = -ENOMEM; goto err_iounmap; } sr_info->dbg_dir = debugfs_create_dir(name, sr_dbg_dir); kfree(name); if (IS_ERR(sr_info->dbg_dir)) { dev_err(&pdev->dev, "%s: Unable to create debugfs directory\n", __func__); ret = PTR_ERR(sr_info->dbg_dir); goto err_iounmap; } (void) debugfs_create_file("autocomp", S_IRUGO | S_IWUSR, sr_info->dbg_dir, (void *)sr_info, &pm_sr_fops); (void) debugfs_create_x32("errweight", S_IRUGO, sr_info->dbg_dir, &sr_info->err_weight); (void) debugfs_create_x32("errmaxlimit", S_IRUGO, sr_info->dbg_dir, &sr_info->err_maxlimit); (void) debugfs_create_x32("errminlimit", S_IRUGO, sr_info->dbg_dir, &sr_info->err_minlimit); nvalue_dir = debugfs_create_dir("nvalue", sr_info->dbg_dir); if (IS_ERR(nvalue_dir)) { dev_err(&pdev->dev, "%s: Unable to create debugfs directory" "for n-values\n", __func__); ret = PTR_ERR(nvalue_dir); goto err_debugfs; } omap_voltage_get_volttable(sr_info->voltdm, &volt_data); if (!volt_data) { dev_warn(&pdev->dev, "%s: No Voltage table for the" " corresponding vdd vdd_%s. Cannot create debugfs" "entries for n-values\n", __func__, sr_info->voltdm->name); ret = -ENODATA; goto err_debugfs; } for (i = 0; i < sr_info->nvalue_count; i++) { char name[NVALUE_NAME_LEN + 1]; snprintf(name, sizeof(name), "volt_%d", volt_data[i].volt_nominal); (void) debugfs_create_x32(name, S_IRUGO | S_IWUSR, nvalue_dir, &(sr_info->nvalue_table[i].nvalue)); } return ret; err_debugfs: debugfs_remove_recursive(sr_info->dbg_dir); err_iounmap: list_del(&sr_info->node); iounmap(sr_info->base); err_release_region: release_mem_region(mem->start, resource_size(mem)); err_free_devinfo: kfree(sr_info); return ret; } static int __devexit omap_sr_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 (IS_ERR(sr_info)) { dev_warn(&pdev->dev, "%s: omap_sr struct not found\n", __func__); return -EINVAL; } if (sr_info->autocomp_active) sr_stop_vddautocomp(sr_info); if (sr_info->dbg_dir) debugfs_remove_recursive(sr_info->dbg_dir); 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_sr_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 on * the PMIC side or somebody has forgotten to register a PMIC * handler. Warn for the second condition. */ 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__); ret = platform_driver_probe(&smartreflex_driver, omap_sr_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");