1046 lines
27 KiB
C
1046 lines
27 KiB
C
// 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 <thara@ti.com>
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*
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* Copyright (C) 2012 Texas Instruments, Inc.
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* Thara Gopinath <thara@ti.com>
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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 <x0080970@ti.com>
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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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#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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/* sr_list contains all the instances of smartreflex module */
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static LIST_HEAD(sr_list);
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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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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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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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* 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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reg_val = __raw_readl(sr->base + offset);
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reg_val &= ~mask;
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value &= mask;
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reg_val |= value;
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__raw_writel(reg_val, (sr->base + offset));
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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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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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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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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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return ERR_PTR(-ENODATA);
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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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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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/* 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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/* 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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if (sr_class->notify)
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sr_class->notify(sr_info, status);
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return IRQ_HANDLED;
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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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/* 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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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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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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if (!sr_class->enable(sr))
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sr->autocomp_active = true;
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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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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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* 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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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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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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return ret;
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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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/* 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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/* SRCONFIG - disable SR */
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sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);
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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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* 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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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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/* 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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static void sr_v2_disable(struct omap_sr *sr)
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{
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int timeout = 0;
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/* Enable MCUDisableAcknowledge interrupt */
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sr_write_reg(sr, IRQENABLE_SET, IRQENABLE_MCUDISABLEACKINT);
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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
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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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* 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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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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/* 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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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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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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return NULL;
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}
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/* Public Functions */
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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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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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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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sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
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SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN;
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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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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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/* 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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return 0;
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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
|
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* minmaxavg 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 minmaxavg module inside the smartreflex module.
|
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* SR settings if using the ERROR module inside Smartreflex.
|
|
* 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_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;
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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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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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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) {
|
|
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);
|
|
}
|
|
|
|
/* 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,
|
|
(void *)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", },
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|
{ .compatible = "ti,omap3-smartreflex-mpu-iva", },
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|
{ .compatible = "ti,omap4-smartreflex-core", },
|
|
{ .compatible = "ti,omap4-smartreflex-mpu", },
|
|
{ .compatible = "ti,omap4-smartreflex-iva", },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, omap_sr_match);
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|
|
|
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");
|