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1045 lines
27 KiB
1045 lines
27 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* OMAP SmartReflex Voltage Control |
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* |
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* Author: Thara Gopinath <[email protected]> |
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* |
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* Copyright (C) 2012 Texas Instruments, Inc. |
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* Thara Gopinath <[email protected]> |
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* |
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* Copyright (C) 2008 Nokia Corporation |
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* Kalle Jokiniemi |
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* |
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* Copyright (C) 2007 Texas Instruments, Inc. |
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* Lesly A M <[email protected]> |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/mod_devicetable.h> |
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#include <linux/interrupt.h> |
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#include <linux/clk.h> |
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#include <linux/io.h> |
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#include <linux/debugfs.h> |
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#include <linux/delay.h> |
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#include <linux/slab.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/power/smartreflex.h> |
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|
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#define DRIVER_NAME "smartreflex" |
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#define SMARTREFLEX_NAME_LEN 32 |
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#define NVALUE_NAME_LEN 40 |
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#define SR_DISABLE_TIMEOUT 200 |
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|
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/* sr_list contains all the instances of smartreflex module */ |
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static LIST_HEAD(sr_list); |
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|
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static struct omap_sr_class_data *sr_class; |
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static struct dentry *sr_dbg_dir; |
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|
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static inline void sr_write_reg(struct omap_sr *sr, unsigned offset, u32 value) |
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{ |
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__raw_writel(value, (sr->base + offset)); |
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} |
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|
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static inline void sr_modify_reg(struct omap_sr *sr, unsigned offset, u32 mask, |
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u32 value) |
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{ |
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u32 reg_val; |
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|
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/* |
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* Smartreflex error config register is special as it contains |
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* certain status bits which if written a 1 into means a clear |
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* of those bits. So in order to make sure no accidental write of |
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* 1 happens to those status bits, do a clear of them in the read |
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* value. This mean this API doesn't rewrite values in these bits |
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* if they are currently set, but does allow the caller to write |
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* those bits. |
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*/ |
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if (sr->ip_type == SR_TYPE_V1 && offset == ERRCONFIG_V1) |
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mask |= ERRCONFIG_STATUS_V1_MASK; |
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else if (sr->ip_type == SR_TYPE_V2 && offset == ERRCONFIG_V2) |
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mask |= ERRCONFIG_VPBOUNDINTST_V2; |
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|
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reg_val = __raw_readl(sr->base + offset); |
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reg_val &= ~mask; |
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|
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value &= mask; |
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|
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reg_val |= value; |
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|
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__raw_writel(reg_val, (sr->base + offset)); |
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} |
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|
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static inline u32 sr_read_reg(struct omap_sr *sr, unsigned offset) |
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{ |
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return __raw_readl(sr->base + offset); |
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} |
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|
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static struct omap_sr *_sr_lookup(struct voltagedomain *voltdm) |
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{ |
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struct omap_sr *sr_info; |
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|
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if (!voltdm) { |
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pr_err("%s: Null voltage domain passed!\n", __func__); |
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return ERR_PTR(-EINVAL); |
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} |
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|
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list_for_each_entry(sr_info, &sr_list, node) { |
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if (voltdm == sr_info->voltdm) |
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return sr_info; |
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} |
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|
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return ERR_PTR(-ENODATA); |
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} |
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|
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static irqreturn_t sr_interrupt(int irq, void *data) |
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{ |
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struct omap_sr *sr_info = data; |
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u32 status = 0; |
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|
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switch (sr_info->ip_type) { |
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case SR_TYPE_V1: |
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/* Read the status bits */ |
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status = sr_read_reg(sr_info, ERRCONFIG_V1); |
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|
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/* Clear them by writing back */ |
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sr_write_reg(sr_info, ERRCONFIG_V1, status); |
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break; |
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case SR_TYPE_V2: |
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/* Read the status bits */ |
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status = sr_read_reg(sr_info, IRQSTATUS); |
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|
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/* Clear them by writing back */ |
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sr_write_reg(sr_info, IRQSTATUS, status); |
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break; |
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default: |
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dev_err(&sr_info->pdev->dev, "UNKNOWN IP type %d\n", |
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sr_info->ip_type); |
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return IRQ_NONE; |
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} |
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|
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if (sr_class->notify) |
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sr_class->notify(sr_info, status); |
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|
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return IRQ_HANDLED; |
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} |
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|
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static void sr_set_clk_length(struct omap_sr *sr) |
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{ |
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struct clk *fck; |
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u32 fclk_speed; |
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|
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/* Try interconnect target module fck first if it already exists */ |
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fck = clk_get(sr->pdev->dev.parent, "fck"); |
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if (IS_ERR(fck)) { |
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fck = clk_get(&sr->pdev->dev, "fck"); |
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if (IS_ERR(fck)) { |
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dev_err(&sr->pdev->dev, |
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"%s: unable to get fck for device %s\n", |
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__func__, dev_name(&sr->pdev->dev)); |
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return; |
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} |
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} |
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fclk_speed = clk_get_rate(fck); |
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clk_put(fck); |
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|
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switch (fclk_speed) { |
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case 12000000: |
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sr->clk_length = SRCLKLENGTH_12MHZ_SYSCLK; |
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break; |
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case 13000000: |
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sr->clk_length = SRCLKLENGTH_13MHZ_SYSCLK; |
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break; |
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case 19200000: |
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sr->clk_length = SRCLKLENGTH_19MHZ_SYSCLK; |
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break; |
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case 26000000: |
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sr->clk_length = SRCLKLENGTH_26MHZ_SYSCLK; |
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break; |
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case 38400000: |
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sr->clk_length = SRCLKLENGTH_38MHZ_SYSCLK; |
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break; |
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default: |
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dev_err(&sr->pdev->dev, "%s: Invalid fclk rate: %d\n", |
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__func__, fclk_speed); |
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break; |
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} |
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} |
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|
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static void sr_start_vddautocomp(struct omap_sr *sr) |
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{ |
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if (!sr_class || !(sr_class->enable) || !(sr_class->configure)) { |
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dev_warn(&sr->pdev->dev, |
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"%s: smartreflex class driver not registered\n", |
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__func__); |
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return; |
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} |
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|
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if (!sr_class->enable(sr)) |
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sr->autocomp_active = true; |
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} |
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|
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static void sr_stop_vddautocomp(struct omap_sr *sr) |
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{ |
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if (!sr_class || !(sr_class->disable)) { |
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dev_warn(&sr->pdev->dev, |
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"%s: smartreflex class driver not registered\n", |
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__func__); |
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return; |
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} |
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|
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if (sr->autocomp_active) { |
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sr_class->disable(sr, 1); |
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sr->autocomp_active = false; |
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} |
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} |
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|
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/* |
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* This function handles the initializations which have to be done |
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* only when both sr device and class driver regiter has |
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* completed. This will be attempted to be called from both sr class |
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* driver register and sr device intializtion API's. Only one call |
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* will ultimately succeed. |
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* |
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* Currently this function registers interrupt handler for a particular SR |
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* if smartreflex class driver is already registered and has |
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* requested for interrupts and the SR interrupt line in present. |
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*/ |
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static int sr_late_init(struct omap_sr *sr_info) |
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{ |
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struct omap_sr_data *pdata = sr_info->pdev->dev.platform_data; |
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int ret = 0; |
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|
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if (sr_class->notify && sr_class->notify_flags && sr_info->irq) { |
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ret = devm_request_irq(&sr_info->pdev->dev, sr_info->irq, |
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sr_interrupt, 0, sr_info->name, sr_info); |
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if (ret) |
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goto error; |
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disable_irq(sr_info->irq); |
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} |
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if (pdata && pdata->enable_on_init) |
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sr_start_vddautocomp(sr_info); |
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|
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return ret; |
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error: |
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list_del(&sr_info->node); |
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dev_err(&sr_info->pdev->dev, "%s: ERROR in registering interrupt handler. Smartreflex will not function as desired\n", |
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__func__); |
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|
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return ret; |
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} |
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|
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static void sr_v1_disable(struct omap_sr *sr) |
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{ |
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int timeout = 0; |
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int errconf_val = ERRCONFIG_MCUACCUMINTST | ERRCONFIG_MCUVALIDINTST | |
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ERRCONFIG_MCUBOUNDINTST; |
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|
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/* Enable MCUDisableAcknowledge interrupt */ |
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sr_modify_reg(sr, ERRCONFIG_V1, |
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ERRCONFIG_MCUDISACKINTEN, ERRCONFIG_MCUDISACKINTEN); |
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|
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/* SRCONFIG - disable SR */ |
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sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0); |
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|
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/* Disable all other SR interrupts and clear the status as needed */ |
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if (sr_read_reg(sr, ERRCONFIG_V1) & ERRCONFIG_VPBOUNDINTST_V1) |
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errconf_val |= ERRCONFIG_VPBOUNDINTST_V1; |
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sr_modify_reg(sr, ERRCONFIG_V1, |
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(ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN | |
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ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_VPBOUNDINTEN_V1), |
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errconf_val); |
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|
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/* |
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* Wait for SR to be disabled. |
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* wait until ERRCONFIG.MCUDISACKINTST = 1. Typical latency is 1us. |
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*/ |
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sr_test_cond_timeout((sr_read_reg(sr, ERRCONFIG_V1) & |
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ERRCONFIG_MCUDISACKINTST), SR_DISABLE_TIMEOUT, |
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timeout); |
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|
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if (timeout >= SR_DISABLE_TIMEOUT) |
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dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n", |
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__func__); |
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|
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/* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */ |
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sr_modify_reg(sr, ERRCONFIG_V1, ERRCONFIG_MCUDISACKINTEN, |
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ERRCONFIG_MCUDISACKINTST); |
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} |
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|
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static void sr_v2_disable(struct omap_sr *sr) |
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{ |
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int timeout = 0; |
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|
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/* Enable MCUDisableAcknowledge interrupt */ |
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sr_write_reg(sr, IRQENABLE_SET, IRQENABLE_MCUDISABLEACKINT); |
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|
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/* SRCONFIG - disable SR */ |
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sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0); |
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|
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/* |
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* Disable all other SR interrupts and clear the status |
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* write to status register ONLY on need basis - only if status |
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* is set. |
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*/ |
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if (sr_read_reg(sr, ERRCONFIG_V2) & ERRCONFIG_VPBOUNDINTST_V2) |
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sr_modify_reg(sr, ERRCONFIG_V2, ERRCONFIG_VPBOUNDINTEN_V2, |
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ERRCONFIG_VPBOUNDINTST_V2); |
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else |
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sr_modify_reg(sr, ERRCONFIG_V2, ERRCONFIG_VPBOUNDINTEN_V2, |
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0x0); |
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sr_write_reg(sr, IRQENABLE_CLR, (IRQENABLE_MCUACCUMINT | |
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IRQENABLE_MCUVALIDINT | |
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IRQENABLE_MCUBOUNDSINT)); |
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sr_write_reg(sr, IRQSTATUS, (IRQSTATUS_MCUACCUMINT | |
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IRQSTATUS_MCVALIDINT | |
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IRQSTATUS_MCBOUNDSINT)); |
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|
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/* |
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* Wait for SR to be disabled. |
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* wait until IRQSTATUS.MCUDISACKINTST = 1. Typical latency is 1us. |
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*/ |
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sr_test_cond_timeout((sr_read_reg(sr, IRQSTATUS) & |
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IRQSTATUS_MCUDISABLEACKINT), SR_DISABLE_TIMEOUT, |
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timeout); |
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|
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if (timeout >= SR_DISABLE_TIMEOUT) |
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dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n", |
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__func__); |
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|
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/* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */ |
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sr_write_reg(sr, IRQENABLE_CLR, IRQENABLE_MCUDISABLEACKINT); |
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sr_write_reg(sr, IRQSTATUS, IRQSTATUS_MCUDISABLEACKINT); |
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} |
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|
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static struct omap_sr_nvalue_table *sr_retrieve_nvalue_row( |
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struct omap_sr *sr, u32 efuse_offs) |
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{ |
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int i; |
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|
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if (!sr->nvalue_table) { |
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dev_warn(&sr->pdev->dev, "%s: Missing ntarget value table\n", |
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__func__); |
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return NULL; |
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} |
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for (i = 0; i < sr->nvalue_count; i++) { |
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if (sr->nvalue_table[i].efuse_offs == efuse_offs) |
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return &sr->nvalue_table[i]; |
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} |
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|
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return NULL; |
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} |
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|
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/* Public Functions */ |
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|
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/** |
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* sr_configure_errgen() - Configures the SmartReflex to perform AVS using the |
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* error generator module. |
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* @sr: SR module to be configured. |
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* |
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* This API is to be called from the smartreflex class driver to |
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* configure the error generator module inside the smartreflex module. |
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* SR settings if using the ERROR module inside Smartreflex. |
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* SR CLASS 3 by default uses only the ERROR module where as |
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* SR CLASS 2 can choose between ERROR module and MINMAXAVG |
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* module. Returns 0 on success and error value in case of failure. |
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*/ |
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int sr_configure_errgen(struct omap_sr *sr) |
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{ |
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u32 sr_config, sr_errconfig, errconfig_offs; |
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u32 vpboundint_en, vpboundint_st; |
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u32 senp_en = 0, senn_en = 0; |
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u8 senp_shift, senn_shift; |
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|
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if (!sr) { |
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pr_warn("%s: NULL omap_sr from %pS\n", |
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__func__, (void *)_RET_IP_); |
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return -EINVAL; |
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} |
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|
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if (!sr->clk_length) |
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sr_set_clk_length(sr); |
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senp_en = sr->senp_mod; |
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senn_en = sr->senn_mod; |
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|
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sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) | |
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SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN; |
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|
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switch (sr->ip_type) { |
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case SR_TYPE_V1: |
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sr_config |= SRCONFIG_DELAYCTRL; |
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senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT; |
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senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT; |
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errconfig_offs = ERRCONFIG_V1; |
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vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V1; |
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vpboundint_st = ERRCONFIG_VPBOUNDINTST_V1; |
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break; |
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case SR_TYPE_V2: |
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senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT; |
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senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT; |
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errconfig_offs = ERRCONFIG_V2; |
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vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V2; |
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vpboundint_st = ERRCONFIG_VPBOUNDINTST_V2; |
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break; |
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default: |
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dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex module without specifying the ip\n", |
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__func__); |
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return -EINVAL; |
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} |
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|
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sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift)); |
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sr_write_reg(sr, SRCONFIG, sr_config); |
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sr_errconfig = (sr->err_weight << ERRCONFIG_ERRWEIGHT_SHIFT) | |
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(sr->err_maxlimit << ERRCONFIG_ERRMAXLIMIT_SHIFT) | |
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(sr->err_minlimit << ERRCONFIG_ERRMINLIMIT_SHIFT); |
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sr_modify_reg(sr, errconfig_offs, (SR_ERRWEIGHT_MASK | |
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SR_ERRMAXLIMIT_MASK | SR_ERRMINLIMIT_MASK), |
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sr_errconfig); |
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|
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/* Enabling the interrupts if the ERROR module is used */ |
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sr_modify_reg(sr, errconfig_offs, (vpboundint_en | vpboundint_st), |
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vpboundint_en); |
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|
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return 0; |
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} |
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|
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/** |
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* sr_disable_errgen() - Disables SmartReflex AVS module's errgen component |
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* @sr: SR module to be configured. |
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* |
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* This API is to be called from the smartreflex class driver to |
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* disable the error generator module inside the smartreflex module. |
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* |
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* Returns 0 on success and error value in case of failure. |
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*/ |
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int sr_disable_errgen(struct omap_sr *sr) |
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{ |
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u32 errconfig_offs; |
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u32 vpboundint_en, vpboundint_st; |
|
|
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if (!sr) { |
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pr_warn("%s: NULL omap_sr from %pS\n", |
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__func__, (void *)_RET_IP_); |
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return -EINVAL; |
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} |
|
|
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switch (sr->ip_type) { |
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case SR_TYPE_V1: |
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errconfig_offs = ERRCONFIG_V1; |
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vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V1; |
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vpboundint_st = ERRCONFIG_VPBOUNDINTST_V1; |
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break; |
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case SR_TYPE_V2: |
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errconfig_offs = ERRCONFIG_V2; |
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vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V2; |
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vpboundint_st = ERRCONFIG_VPBOUNDINTST_V2; |
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break; |
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default: |
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dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex module without specifying the ip\n", |
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__func__); |
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return -EINVAL; |
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} |
|
|
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/* Disable the Sensor and errorgen */ |
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sr_modify_reg(sr, SRCONFIG, SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN, 0); |
|
|
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/* |
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* Disable the interrupts of ERROR module |
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* NOTE: modify is a read, modify,write - an implicit OCP barrier |
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* which is required is present here - sequencing is critical |
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* at this point (after errgen is disabled, vpboundint disable) |
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*/ |
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sr_modify_reg(sr, errconfig_offs, vpboundint_en | vpboundint_st, 0); |
|
|
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return 0; |
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} |
|
|
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/** |
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* sr_configure_minmax() - Configures the SmartReflex to perform AVS using the |
|
* minmaxavg module. |
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* @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. |
|
*/ |
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int sr_configure_minmax(struct omap_sr *sr) |
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{ |
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u32 sr_config, sr_avgwt; |
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u32 senp_en = 0, senn_en = 0; |
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u8 senp_shift, senn_shift; |
|
|
|
if (!sr) { |
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pr_warn("%s: NULL omap_sr from %pS\n", |
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__func__, (void *)_RET_IP_); |
|
return -EINVAL; |
|
} |
|
|
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if (!sr->clk_length) |
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sr_set_clk_length(sr); |
|
|
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senp_en = sr->senp_mod; |
|
senn_en = sr->senn_mod; |
|
|
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sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) | |
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SRCONFIG_SENENABLE | |
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(sr->accum_data << SRCONFIG_ACCUMDATA_SHIFT); |
|
|
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switch (sr->ip_type) { |
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case SR_TYPE_V1: |
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sr_config |= SRCONFIG_DELAYCTRL; |
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senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT; |
|
senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT; |
|
break; |
|
case SR_TYPE_V2: |
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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; |
|
} |
|
|
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sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift)); |
|
sr_write_reg(sr, SRCONFIG, sr_config); |
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sr_avgwt = (sr->senp_avgweight << AVGWEIGHT_SENPAVGWEIGHT_SHIFT) | |
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(sr->senn_avgweight << AVGWEIGHT_SENNAVGWEIGHT_SHIFT); |
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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), |
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(ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUACCUMINTST | |
|
ERRCONFIG_MCUVALIDINTEN | ERRCONFIG_MCUVALIDINTST | |
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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); |
|
} |
|
|
|
/* 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 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); |
|
|
|
ret = pm_runtime_get_sync(&pdev->dev); |
|
if (ret < 0) { |
|
pm_runtime_put_noidle(&pdev->dev); |
|
goto err_list_del; |
|
} |
|
|
|
/* |
|
* 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); |
|
|
|
sr_info->dbg_dir = debugfs_create_dir(sr_info->name, sr_dbg_dir); |
|
|
|
debugfs_create_file("autocomp", S_IRUGO | S_IWUSR, sr_info->dbg_dir, |
|
sr_info, &pm_sr_fops); |
|
debugfs_create_x32("errweight", S_IRUGO, sr_info->dbg_dir, |
|
&sr_info->err_weight); |
|
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 (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); |
|
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); |
|
debugfs_create_x32(name, S_IRUGO | S_IWUSR, nvalue_dir, |
|
&(sr_info->nvalue_table[i].errminlimit)); |
|
|
|
} |
|
|
|
pm_runtime_put_sync(&pdev->dev); |
|
|
|
return ret; |
|
|
|
err_debugfs: |
|
debugfs_remove_recursive(sr_info->dbg_dir); |
|
err_list_del: |
|
list_del(&sr_info->node); |
|
|
|
pm_runtime_put_sync(&pdev->dev); |
|
|
|
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); |
|
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 const struct of_device_id omap_sr_match[] = { |
|
{ .compatible = "ti,omap3-smartreflex-core", }, |
|
{ .compatible = "ti,omap3-smartreflex-mpu-iva", }, |
|
{ .compatible = "ti,omap4-smartreflex-core", }, |
|
{ .compatible = "ti,omap4-smartreflex-mpu", }, |
|
{ .compatible = "ti,omap4-smartreflex-iva", }, |
|
{ }, |
|
}; |
|
MODULE_DEVICE_TABLE(of, omap_sr_match); |
|
|
|
static struct platform_driver smartreflex_driver = { |
|
.probe = omap_sr_probe, |
|
.remove = omap_sr_remove, |
|
.shutdown = omap_sr_shutdown, |
|
.driver = { |
|
.name = DRIVER_NAME, |
|
.of_match_table = omap_sr_match, |
|
}, |
|
}; |
|
|
|
static int __init sr_init(void) |
|
{ |
|
int ret = 0; |
|
|
|
ret = platform_driver_register(&smartreflex_driver); |
|
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");
|
|
|