/* * OMAP SmartReflex Voltage Control * * Author: Thara Gopinath <thara@ti.com> * * Copyright (C) 2012 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 <linux/power/smartreflex.h> #define DRIVER_NAME "smartreflex" #define SMARTREFLEX_NAME_LEN 32 #define NVALUE_NAME_LEN 40 #define SR_DISABLE_TIMEOUT 200 /* 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; /* * 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 && offset == ERRCONFIG_V1) mask |= ERRCONFIG_STATUS_V1_MASK; else if (sr->ip_type == SR_TYPE_V2 && offset == ERRCONFIG_V2) mask |= ERRCONFIG_VPBOUNDINTST_V2; reg_val = __raw_readl(sr->base + offset); reg_val &= ~mask; value &= 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 = data; u32 status = 0; switch (sr_info->ip_type) { case 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); break; case 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); break; default: dev_err(&sr_info->pdev->dev, "UNKNOWN IP type %d\n", sr_info->ip_type); return IRQ_NONE; } if (sr_class->notify) sr_class->notify(sr_info, status); return IRQ_HANDLED; } static void sr_set_clk_length(struct omap_sr *sr) { struct clk *fck; u32 fclk_speed; fck = clk_get(&sr->pdev->dev, "fck"); if (IS_ERR(fck)) { dev_err(&sr->pdev->dev, "%s: unable to get fck for device %s\n", __func__, dev_name(&sr->pdev->dev)); return; } fclk_speed = clk_get_rate(fck); clk_put(fck); switch (fclk_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 fclk rate: %d\n", __func__, fclk_speed); break; } } 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)) 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, 1); sr->autocomp_active = false; } } /* * This function handles the initializations 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) { struct omap_sr_data *pdata = sr_info->pdev->dev.platform_data; int ret = 0; if (sr_class->notify && sr_class->notify_flags && sr_info->irq) { ret = devm_request_irq(&sr_info->pdev->dev, sr_info->irq, sr_interrupt, 0, sr_info->name, 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: 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__); return ret; } static void sr_v1_disable(struct omap_sr *sr) { int timeout = 0; int errconf_val = ERRCONFIG_MCUACCUMINTST | ERRCONFIG_MCUVALIDINTST | ERRCONFIG_MCUBOUNDINTST; /* 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 as needed */ if (sr_read_reg(sr, ERRCONFIG_V1) & ERRCONFIG_VPBOUNDINTST_V1) errconf_val |= ERRCONFIG_VPBOUNDINTST_V1; sr_modify_reg(sr, ERRCONFIG_V1, (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN | ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_VPBOUNDINTEN_V1), errconf_val); /* * Wait for SR to be disabled. * wait until ERRCONFIG.MCUDISACKINTST = 1. Typical latency is 1us. */ sr_test_cond_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 * write to status register ONLY on need basis - only if status * is set. */ if (sr_read_reg(sr, ERRCONFIG_V2) & ERRCONFIG_VPBOUNDINTST_V2) sr_modify_reg(sr, ERRCONFIG_V2, ERRCONFIG_VPBOUNDINTEN_V2, ERRCONFIG_VPBOUNDINTST_V2); else sr_modify_reg(sr, ERRCONFIG_V2, ERRCONFIG_VPBOUNDINTEN_V2, 0x0); 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. */ sr_test_cond_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 struct omap_sr_nvalue_table *sr_retrieve_nvalue_row( 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 NULL; } for (i = 0; i < sr->nvalue_count; i++) { if (sr->nvalue_table[i].efuse_offs == efuse_offs) return &sr->nvalue_table[i]; } return NULL; } /* Public Functions */ /** * sr_configure_errgen() - Configures the SmartReflex to perform AVS using the * error generator module. * @sr: SR module to be configured. * * 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 omap_sr *sr) { u32 sr_config, sr_errconfig, errconfig_offs; u32 vpboundint_en, vpboundint_st; u32 senp_en = 0, senn_en = 0; u8 senp_shift, senn_shift; if (!sr) { pr_warn("%s: NULL omap_sr from %pS\n", __func__, (void *)_RET_IP_); 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; switch (sr->ip_type) { case 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; break; case 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; break; default: 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_st), vpboundint_en); return 0; } /** * sr_disable_errgen() - Disables SmartReflex AVS module's errgen component * @sr: SR module to be configured. * * This API is to be called from the smartreflex class driver to * disable the error generator module inside the smartreflex module. * * Returns 0 on success and error value in case of failure. */ int sr_disable_errgen(struct omap_sr *sr) { u32 errconfig_offs; u32 vpboundint_en, vpboundint_st; if (!sr) { pr_warn("%s: NULL omap_sr from %pS\n", __func__, (void *)_RET_IP_); return -EINVAL; } switch (sr->ip_type) { case SR_TYPE_V1: errconfig_offs = ERRCONFIG_V1; vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V1; vpboundint_st = ERRCONFIG_VPBOUNDINTST_V1; break; case SR_TYPE_V2: errconfig_offs = ERRCONFIG_V2; vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V2; vpboundint_st = ERRCONFIG_VPBOUNDINTST_V2; break; default: dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex module without specifying the ip\n", __func__); return -EINVAL; } /* Disable the Sensor and errorgen */ sr_modify_reg(sr, SRCONFIG, SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN, 0); /* * Disable the interrupts of ERROR module * NOTE: modify is a read, modify,write - an implicit OCP barrier * which is required is present here - sequencing is critical * at this point (after errgen is disabled, vpboundint disable) */ sr_modify_reg(sr, errconfig_offs, vpboundint_en | vpboundint_st, 0); return 0; } /** * sr_configure_minmax() - Configures the SmartReflex to perform AVS using the * minmaxavg module. * @sr: SR module to be configured. * * 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 omap_sr *sr) { u32 sr_config, sr_avgwt; u32 senp_en = 0, senn_en = 0; u8 senp_shift, senn_shift; if (!sr) { pr_warn("%s: NULL omap_sr from %pS\n", __func__, (void *)_RET_IP_); 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); switch (sr->ip_type) { case SR_TYPE_V1: sr_config |= SRCONFIG_DELAYCTRL; senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT; senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT; break; case SR_TYPE_V2: senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT; senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT; break; default: 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 */ switch (sr->ip_type) { case 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)); break; case 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); break; default: dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex module without specifying the ip\n", __func__); return -EINVAL; } return 0; } /** * sr_enable() - Enables the smartreflex module. * @sr: 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 omap_sr *sr, unsigned long volt) { struct omap_volt_data *volt_data; struct omap_sr_nvalue_table *nvalue_row; int ret; if (!sr) { pr_warn("%s: NULL omap_sr from %pS\n", __func__, (void *)_RET_IP_); 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 PTR_ERR(volt_data); } nvalue_row = sr_retrieve_nvalue_row(sr, volt_data->sr_efuse_offs); if (!nvalue_row) { dev_warn(&sr->pdev->dev, "%s: failure getting SR data for this voltage %ld\n", __func__, volt); return -ENODATA; } /* errminlimit is opp dependent and hence linked to voltage */ sr->err_minlimit = nvalue_row->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(sr); if (ret) return ret; sr_write_reg(sr, NVALUERECIPROCAL, nvalue_row->nvalue); /* SRCONFIG - enable SR */ sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, SRCONFIG_SRENABLE); return 0; } /** * sr_disable() - Disables the smartreflex module. * @sr: 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 omap_sr *sr) { if (!sr) { pr_warn("%s: NULL omap_sr from %pS\n", __func__, (void *)_RET_IP_); 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) { switch (sr->ip_type) { case SR_TYPE_V1: sr_v1_disable(sr); break; case SR_TYPE_V2: sr_v2_disable(sr); break; default: dev_err(&sr->pdev->dev, "UNKNOWN IP type %d\n", sr->ip_type); } } 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_warn("%s:, Smartreflex class data passed is NULL\n", __func__); return -EINVAL; } if (sr_class) { pr_warn("%s: Smartreflex class driver already registered\n", __func__); return -EBUSY; } sr_class = class_data; /* * Call into late init to do initializations 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_warn("%s: omap_sr struct for voltdm not found\n", __func__); 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(sr); } /** * 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_warn("%s: omap_sr struct for voltdm not found\n", __func__); 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(sr, 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_warn("%s: omap_sr struct for voltdm not found\n", __func__); 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(sr, 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_warn("%s: Trying to register NULL PMIC data structure with smartreflex\n", __func__); return; } sr_pmic_data = pmic_data; } /* PM Debug FS entries to enable and disable smartreflex. */ static int omap_sr_autocomp_show(void *data, u64 *val) { struct omap_sr *sr_info = data; if (!sr_info) { pr_warn("%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 = data; if (!sr_info) { pr_warn("%s: omap_sr struct not found\n", __func__); return -EINVAL; } /* Sanity check */ if (val > 1) { pr_warn("%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; struct omap_sr_data *pdata = pdev->dev.platform_data; struct resource *mem, *irq; struct dentry *nvalue_dir; int i, ret = 0; sr_info = devm_kzalloc(&pdev->dev, sizeof(struct omap_sr), GFP_KERNEL); if (!sr_info) return -ENOMEM; sr_info->name = devm_kzalloc(&pdev->dev, SMARTREFLEX_NAME_LEN, GFP_KERNEL); if (!sr_info->name) return -ENOMEM; platform_set_drvdata(pdev, sr_info); if (!pdata) { dev_err(&pdev->dev, "%s: platform data missing\n", __func__); return -EINVAL; } mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); sr_info->base = devm_ioremap_resource(&pdev->dev, mem); if (IS_ERR(sr_info->base)) { dev_err(&pdev->dev, "%s: ioremap fail\n", __func__); return PTR_ERR(sr_info->base); } irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); pm_runtime_enable(&pdev->dev); pm_runtime_irq_safe(&pdev->dev); snprintf(sr_info->name, SMARTREFLEX_NAME_LEN, "%s", pdata->name); 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->err_weight = pdata->err_weight; sr_info->err_maxlimit = pdata->err_maxlimit; sr_info->accum_data = pdata->accum_data; sr_info->senn_avgweight = pdata->senn_avgweight; sr_info->senp_avgweight = pdata->senp_avgweight; sr_info->autocomp_active = false; sr_info->ip_type = pdata->ip_type; if (irq) sr_info->irq = irq->start; sr_set_clk_length(sr_info); list_add(&sr_info->node, &sr_list); /* * Call into late init to do initializations that require * both sr driver and sr class driver to be initiallized. */ if (sr_class) { ret = sr_late_init(sr_info); if (ret) { pr_warn("%s: Error in SR late init\n", __func__); goto err_list_del; } } dev_info(&pdev->dev, "%s: SmartReflex driver initialized\n", __func__); if (!sr_dbg_dir) { sr_dbg_dir = debugfs_create_dir("smartreflex", NULL); if (IS_ERR_OR_NULL(sr_dbg_dir)) { ret = PTR_ERR(sr_dbg_dir); pr_err("%s:sr debugfs dir creation failed(%d)\n", __func__, ret); goto err_list_del; } } sr_info->dbg_dir = debugfs_create_dir(sr_info->name, sr_dbg_dir); if (IS_ERR_OR_NULL(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_debugfs; } (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); nvalue_dir = debugfs_create_dir("nvalue", sr_info->dbg_dir); if (IS_ERR_OR_NULL(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; } if (sr_info->nvalue_count == 0 || !sr_info->nvalue_table) { dev_warn(&pdev->dev, "%s: %s: No Voltage table for the corresponding vdd. Cannot create debugfs entries for n-values\n", __func__, sr_info->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_%lu", sr_info->nvalue_table[i].volt_nominal); (void) debugfs_create_x32(name, S_IRUGO | S_IWUSR, nvalue_dir, &(sr_info->nvalue_table[i].nvalue)); snprintf(name, sizeof(name), "errminlimit_%lu", sr_info->nvalue_table[i].volt_nominal); (void) debugfs_create_x32(name, S_IRUGO | S_IWUSR, nvalue_dir, &(sr_info->nvalue_table[i].errminlimit)); } return ret; err_debugfs: debugfs_remove_recursive(sr_info->dbg_dir); err_list_del: list_del(&sr_info->node); return ret; } static int omap_sr_remove(struct platform_device *pdev) { struct omap_sr_data *pdata = pdev->dev.platform_data; struct omap_sr *sr_info; 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 PTR_ERR(sr_info); } if (sr_info->autocomp_active) sr_stop_vddautocomp(sr_info); if (sr_info->dbg_dir) debugfs_remove_recursive(sr_info->dbg_dir); pm_runtime_disable(&pdev->dev); list_del(&sr_info->node); return 0; } static void omap_sr_shutdown(struct platform_device *pdev) { struct omap_sr_data *pdata = pdev->dev.platform_data; struct omap_sr *sr_info; if (!pdata) { dev_err(&pdev->dev, "%s: platform data missing\n", __func__); return; } sr_info = _sr_lookup(pdata->voltdm); if (IS_ERR(sr_info)) { dev_warn(&pdev->dev, "%s: omap_sr struct not found\n", __func__); return; } if (sr_info->autocomp_active) sr_stop_vddautocomp(sr_info); return; } static struct platform_driver smartreflex_driver = { .remove = omap_sr_remove, .shutdown = omap_sr_shutdown, .driver = { .name = DRIVER_NAME, }, }; 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_warn("%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; } late_initcall(sr_init); static void __exit sr_exit(void) { platform_driver_unregister(&smartreflex_driver); } module_exit(sr_exit); MODULE_DESCRIPTION("OMAP Smartreflex Driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:" DRIVER_NAME); MODULE_AUTHOR("Texas Instruments Inc");