| /* |
| * 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; |
| |
| /* |
| * 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 = (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; |
| 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. |
| */ |
| 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 |
| * 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. |
| */ |
| 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_st), |
| vpboundint_en); |
| |
| return 0; |
| } |
| |
| /** |
| * sr_disable_errgen() - Disables SmartReflex AVS module's errgen component |
| * @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 the error generator module inside the smartreflex module. |
| * |
| * Returns 0 on success and error value in case of failure. |
| */ |
| int sr_disable_errgen(struct voltagedomain *voltdm) |
| { |
| u32 errconfig_offs, vpboundint_en; |
| u32 vpboundint_st; |
| 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->ip_type == SR_TYPE_V1) { |
| errconfig_offs = ERRCONFIG_V1; |
| vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V1; |
| vpboundint_st = ERRCONFIG_VPBOUNDINTST_V1; |
| } else if (sr->ip_type == SR_TYPE_V2) { |
| 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; |
| } |
| |
| /* Disable the interrupts of ERROR module */ |
| sr_modify_reg(sr, errconfig_offs, vpboundint_en | vpboundint_st, 0); |
| |
| /* Disable the Sensor and errorgen */ |
| sr_modify_reg(sr, SRCONFIG, SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN, 0); |
| |
| 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; |
| } |
| |
| platform_set_drvdata(pdev, sr_info); |
| |
| 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__); |
| goto err_iounmap; |
| } |
| } |
| |
| 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 void __devexit 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 = __devexit_p(omap_sr_remove), |
| .shutdown = __devexit_p(omap_sr_shutdown), |
| .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"); |