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442155adc0
Error label case seems to have a 2 tab indentation when just 1 is necessary. Signed-off-by: Nishanth Menon <nm@ti.com> Signed-off-by: Kevin Hilman <khilman@ti.com>
1046 lines
28 KiB
C
1046 lines
28 KiB
C
/*
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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) 2010 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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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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 <plat/common.h>
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#include "pm.h"
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#include "smartreflex.h"
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#define SMARTREFLEX_NAME_LEN 16
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#define NVALUE_NAME_LEN 40
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#define SR_DISABLE_TIMEOUT 200
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struct omap_sr {
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int srid;
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int ip_type;
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int nvalue_count;
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bool autocomp_active;
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u32 clk_length;
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u32 err_weight;
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u32 err_minlimit;
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u32 err_maxlimit;
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u32 accum_data;
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u32 senn_avgweight;
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u32 senp_avgweight;
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u32 senp_mod;
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u32 senn_mod;
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unsigned int irq;
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void __iomem *base;
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struct platform_device *pdev;
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struct list_head node;
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struct omap_sr_nvalue_table *nvalue_table;
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struct voltagedomain *voltdm;
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struct dentry *dbg_dir;
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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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static struct omap_sr_class_data *sr_class;
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static struct omap_sr_pmic_data *sr_pmic_data;
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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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u32 errconfig_offs = 0, errconfig_mask = 0;
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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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* 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) {
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errconfig_offs = ERRCONFIG_V1;
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errconfig_mask = ERRCONFIG_STATUS_V1_MASK;
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} else if (sr->ip_type == SR_TYPE_V2) {
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errconfig_offs = ERRCONFIG_V2;
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errconfig_mask = ERRCONFIG_VPBOUNDINTST_V2;
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}
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if (offset == errconfig_offs)
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reg_val &= ~errconfig_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 = (struct omap_sr *)data;
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u32 status = 0;
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if (sr_info->ip_type == 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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} else if (sr_info->ip_type == SR_TYPE_V2) {
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/* Read the status bits */
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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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}
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if (sr_class->notify)
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sr_class->notify(sr_info->voltdm, 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 *sys_ck;
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u32 sys_clk_speed;
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if (cpu_is_omap34xx())
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sys_ck = clk_get(NULL, "sys_ck");
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else
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sys_ck = clk_get(NULL, "sys_clkin_ck");
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if (IS_ERR(sys_ck)) {
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dev_err(&sr->pdev->dev, "%s: unable to get sys clk\n",
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__func__);
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return;
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}
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sys_clk_speed = clk_get_rate(sys_ck);
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clk_put(sys_ck);
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switch (sys_clk_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 sysclk value: %d\n",
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__func__, sys_clk_speed);
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break;
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}
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}
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static void sr_set_regfields(struct omap_sr *sr)
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{
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/*
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* For time being these values are defined in smartreflex.h
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* and populated during init. May be they can be moved to board
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* file or pmic specific data structure. In that case these structure
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* fields will have to be populated using the pdata or pmic structure.
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*/
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if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
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sr->err_weight = OMAP3430_SR_ERRWEIGHT;
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sr->err_maxlimit = OMAP3430_SR_ERRMAXLIMIT;
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sr->accum_data = OMAP3430_SR_ACCUMDATA;
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if (!(strcmp(sr->voltdm->name, "mpu"))) {
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sr->senn_avgweight = OMAP3430_SR1_SENNAVGWEIGHT;
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sr->senp_avgweight = OMAP3430_SR1_SENPAVGWEIGHT;
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} else {
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sr->senn_avgweight = OMAP3430_SR2_SENNAVGWEIGHT;
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sr->senp_avgweight = OMAP3430_SR2_SENPAVGWEIGHT;
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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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if (!sr_class->enable(sr->voltdm))
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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->voltdm, 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 intializations 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 interrrupt 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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char *name;
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struct omap_sr_data *pdata = sr_info->pdev->dev.platform_data;
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struct resource *mem;
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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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name = kasprintf(GFP_KERNEL, "sr_%s", sr_info->voltdm->name);
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if (name == NULL) {
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ret = -ENOMEM;
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goto error;
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}
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ret = request_irq(sr_info->irq, sr_interrupt,
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0, name, (void *)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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iounmap(sr_info->base);
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mem = platform_get_resource(sr_info->pdev, IORESOURCE_MEM, 0);
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release_mem_region(mem->start, resource_size(mem));
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list_del(&sr_info->node);
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dev_err(&sr_info->pdev->dev, "%s: ERROR in registering"
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"interrupt handler. Smartreflex will"
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"not function as desired\n", __func__);
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kfree(name);
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kfree(sr_info);
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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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/* 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 */
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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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(ERRCONFIG_MCUACCUMINTST | ERRCONFIG_MCUVALIDINTST |
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ERRCONFIG_MCUBOUNDINTST |
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ERRCONFIG_VPBOUNDINTST_V1));
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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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omap_test_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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/* Disable all other SR interrupts and clear the status */
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sr_modify_reg(sr, ERRCONFIG_V2, ERRCONFIG_VPBOUNDINTEN_V2,
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ERRCONFIG_VPBOUNDINTST_V2);
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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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omap_test_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 u32 sr_retrieve_nvalue(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 0;
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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].nvalue;
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}
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return 0;
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}
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/* Public Functions */
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/**
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* sr_configure_errgen() - Configures the smrtreflex to perform AVS using the
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* error generator module.
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* @voltdm: VDD pointer to which the SR module to be configured belongs to.
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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 voltagedomain *voltdm)
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{
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u32 sr_config, sr_errconfig, errconfig_offs, vpboundint_en;
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u32 vpboundint_st, senp_en = 0, senn_en = 0;
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u8 senp_shift, senn_shift;
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struct omap_sr *sr = _sr_lookup(voltdm);
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if (IS_ERR(sr)) {
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pr_warning("%s: omap_sr struct for sr_%s not found\n",
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__func__, voltdm->name);
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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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if (sr->ip_type == 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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} else if (sr->ip_type == 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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} else {
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dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
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"module without specifying the ip\n", __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,
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vpboundint_en, (vpboundint_en | vpboundint_st));
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return 0;
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}
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|
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/**
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* sr_configure_minmax() - Configures the smrtreflex to perform AVS using the
|
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* minmaxavg module.
|
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* @voltdm: VDD pointer to which the SR module to be configured belongs to.
|
|
*
|
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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 voltagedomain *voltdm)
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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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struct omap_sr *sr = _sr_lookup(voltdm);
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|
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if (IS_ERR(sr)) {
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pr_warning("%s: omap_sr struct for sr_%s not found\n",
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__func__, voltdm->name);
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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;
|
|
|
|
sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |
|
|
SRCONFIG_SENENABLE |
|
|
(sr->accum_data << SRCONFIG_ACCUMDATA_SHIFT);
|
|
|
|
if (sr->ip_type == SR_TYPE_V1) {
|
|
sr_config |= SRCONFIG_DELAYCTRL;
|
|
senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT;
|
|
senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT;
|
|
} else if (sr->ip_type == SR_TYPE_V2) {
|
|
senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT;
|
|
senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT;
|
|
} else {
|
|
dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex"
|
|
"module without specifying the ip\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift));
|
|
sr_write_reg(sr, SRCONFIG, sr_config);
|
|
sr_avgwt = (sr->senp_avgweight << AVGWEIGHT_SENPAVGWEIGHT_SHIFT) |
|
|
(sr->senn_avgweight << AVGWEIGHT_SENNAVGWEIGHT_SHIFT);
|
|
sr_write_reg(sr, AVGWEIGHT, sr_avgwt);
|
|
|
|
/*
|
|
* Enabling the interrupts if MINMAXAVG module is used.
|
|
* TODO: check if all the interrupts are mandatory
|
|
*/
|
|
if (sr->ip_type == SR_TYPE_V1) {
|
|
sr_modify_reg(sr, ERRCONFIG_V1,
|
|
(ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN |
|
|
ERRCONFIG_MCUBOUNDINTEN),
|
|
(ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUACCUMINTST |
|
|
ERRCONFIG_MCUVALIDINTEN | ERRCONFIG_MCUVALIDINTST |
|
|
ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_MCUBOUNDINTST));
|
|
} else if (sr->ip_type == SR_TYPE_V2) {
|
|
sr_write_reg(sr, IRQSTATUS,
|
|
IRQSTATUS_MCUACCUMINT | IRQSTATUS_MCVALIDINT |
|
|
IRQSTATUS_MCBOUNDSINT | IRQSTATUS_MCUDISABLEACKINT);
|
|
sr_write_reg(sr, IRQENABLE_SET,
|
|
IRQENABLE_MCUACCUMINT | IRQENABLE_MCUVALIDINT |
|
|
IRQENABLE_MCUBOUNDSINT | IRQENABLE_MCUDISABLEACKINT);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sr_enable() - Enables the smartreflex module.
|
|
* @voltdm: VDD pointer to which the SR module to be configured belongs to.
|
|
* @volt: The voltage at which the Voltage domain associated with
|
|
* the smartreflex module is operating at.
|
|
* This is required only to program the correct Ntarget value.
|
|
*
|
|
* This API is to be called from the smartreflex class driver to
|
|
* enable a smartreflex module. Returns 0 on success. Returns error
|
|
* value if the voltage passed is wrong or if ntarget value is wrong.
|
|
*/
|
|
int sr_enable(struct voltagedomain *voltdm, unsigned long volt)
|
|
{
|
|
u32 nvalue_reciprocal;
|
|
struct omap_volt_data *volt_data;
|
|
struct omap_sr *sr = _sr_lookup(voltdm);
|
|
int ret;
|
|
|
|
if (IS_ERR(sr)) {
|
|
pr_warning("%s: omap_sr struct for sr_%s not found\n",
|
|
__func__, voltdm->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
volt_data = omap_voltage_get_voltdata(sr->voltdm, volt);
|
|
|
|
if (IS_ERR(volt_data)) {
|
|
dev_warn(&sr->pdev->dev, "%s: Unable to get voltage table"
|
|
"for nominal voltage %ld\n", __func__, volt);
|
|
return -ENODATA;
|
|
}
|
|
|
|
nvalue_reciprocal = sr_retrieve_nvalue(sr, volt_data->sr_efuse_offs);
|
|
|
|
if (!nvalue_reciprocal) {
|
|
dev_warn(&sr->pdev->dev, "%s: NVALUE = 0 at voltage %ld\n",
|
|
__func__, volt);
|
|
return -ENODATA;
|
|
}
|
|
|
|
/* errminlimit is opp dependent and hence linked to voltage */
|
|
sr->err_minlimit = volt_data->sr_errminlimit;
|
|
|
|
pm_runtime_get_sync(&sr->pdev->dev);
|
|
|
|
/* Check if SR is already enabled. If yes do nothing */
|
|
if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE)
|
|
return 0;
|
|
|
|
/* Configure SR */
|
|
ret = sr_class->configure(voltdm);
|
|
if (ret)
|
|
return ret;
|
|
|
|
sr_write_reg(sr, NVALUERECIPROCAL, nvalue_reciprocal);
|
|
|
|
/* SRCONFIG - enable SR */
|
|
sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, SRCONFIG_SRENABLE);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sr_disable() - Disables the smartreflex module.
|
|
* @voltdm: VDD pointer to which the SR module to be configured belongs to.
|
|
*
|
|
* This API is to be called from the smartreflex class driver to
|
|
* disable a smartreflex module.
|
|
*/
|
|
void sr_disable(struct voltagedomain *voltdm)
|
|
{
|
|
struct omap_sr *sr = _sr_lookup(voltdm);
|
|
|
|
if (IS_ERR(sr)) {
|
|
pr_warning("%s: omap_sr struct for sr_%s not found\n",
|
|
__func__, voltdm->name);
|
|
return;
|
|
}
|
|
|
|
/* Check if SR clocks are already disabled. If yes do nothing */
|
|
if (pm_runtime_suspended(&sr->pdev->dev))
|
|
return;
|
|
|
|
/*
|
|
* Disable SR if only it is indeed enabled. Else just
|
|
* disable the clocks.
|
|
*/
|
|
if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE) {
|
|
if (sr->ip_type == SR_TYPE_V1)
|
|
sr_v1_disable(sr);
|
|
else if (sr->ip_type == SR_TYPE_V2)
|
|
sr_v2_disable(sr);
|
|
}
|
|
|
|
pm_runtime_put_sync(&sr->pdev->dev);
|
|
}
|
|
|
|
/**
|
|
* sr_register_class() - API to register a smartreflex class parameters.
|
|
* @class_data: The structure containing various sr class specific data.
|
|
*
|
|
* This API is to be called by the smartreflex class driver to register itself
|
|
* with the smartreflex driver during init. Returns 0 on success else the
|
|
* error value.
|
|
*/
|
|
int sr_register_class(struct omap_sr_class_data *class_data)
|
|
{
|
|
struct omap_sr *sr_info;
|
|
|
|
if (!class_data) {
|
|
pr_warning("%s:, Smartreflex class data passed is NULL\n",
|
|
__func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (sr_class) {
|
|
pr_warning("%s: Smartreflex class driver already registered\n",
|
|
__func__);
|
|
return -EBUSY;
|
|
}
|
|
|
|
sr_class = class_data;
|
|
|
|
/*
|
|
* Call into late init to do intializations that require
|
|
* both sr driver and sr class driver to be initiallized.
|
|
*/
|
|
list_for_each_entry(sr_info, &sr_list, node)
|
|
sr_late_init(sr_info);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* omap_sr_enable() - API to enable SR clocks and to call into the
|
|
* registered smartreflex class enable API.
|
|
* @voltdm: VDD pointer to which the SR module to be configured belongs to.
|
|
*
|
|
* This API is to be called from the kernel in order to enable
|
|
* a particular smartreflex module. This API will do the initial
|
|
* configurations to turn on the smartreflex module and in turn call
|
|
* into the registered smartreflex class enable API.
|
|
*/
|
|
void omap_sr_enable(struct voltagedomain *voltdm)
|
|
{
|
|
struct omap_sr *sr = _sr_lookup(voltdm);
|
|
|
|
if (IS_ERR(sr)) {
|
|
pr_warning("%s: omap_sr struct for sr_%s not found\n",
|
|
__func__, voltdm->name);
|
|
return;
|
|
}
|
|
|
|
if (!sr->autocomp_active)
|
|
return;
|
|
|
|
if (!sr_class || !(sr_class->enable) || !(sr_class->configure)) {
|
|
dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
|
|
"registered\n", __func__);
|
|
return;
|
|
}
|
|
|
|
sr_class->enable(voltdm);
|
|
}
|
|
|
|
/**
|
|
* omap_sr_disable() - API to disable SR without resetting the voltage
|
|
* processor voltage
|
|
* @voltdm: VDD pointer to which the SR module to be configured belongs to.
|
|
*
|
|
* This API is to be called from the kernel in order to disable
|
|
* a particular smartreflex module. This API will in turn call
|
|
* into the registered smartreflex class disable API. This API will tell
|
|
* the smartreflex class disable not to reset the VP voltage after
|
|
* disabling smartreflex.
|
|
*/
|
|
void omap_sr_disable(struct voltagedomain *voltdm)
|
|
{
|
|
struct omap_sr *sr = _sr_lookup(voltdm);
|
|
|
|
if (IS_ERR(sr)) {
|
|
pr_warning("%s: omap_sr struct for sr_%s not found\n",
|
|
__func__, voltdm->name);
|
|
return;
|
|
}
|
|
|
|
if (!sr->autocomp_active)
|
|
return;
|
|
|
|
if (!sr_class || !(sr_class->disable)) {
|
|
dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
|
|
"registered\n", __func__);
|
|
return;
|
|
}
|
|
|
|
sr_class->disable(voltdm, 0);
|
|
}
|
|
|
|
/**
|
|
* omap_sr_disable_reset_volt() - API to disable SR and reset the
|
|
* voltage processor voltage
|
|
* @voltdm: VDD pointer to which the SR module to be configured belongs to.
|
|
*
|
|
* This API is to be called from the kernel in order to disable
|
|
* a particular smartreflex module. This API will in turn call
|
|
* into the registered smartreflex class disable API. This API will tell
|
|
* the smartreflex class disable to reset the VP voltage after
|
|
* disabling smartreflex.
|
|
*/
|
|
void omap_sr_disable_reset_volt(struct voltagedomain *voltdm)
|
|
{
|
|
struct omap_sr *sr = _sr_lookup(voltdm);
|
|
|
|
if (IS_ERR(sr)) {
|
|
pr_warning("%s: omap_sr struct for sr_%s not found\n",
|
|
__func__, voltdm->name);
|
|
return;
|
|
}
|
|
|
|
if (!sr->autocomp_active)
|
|
return;
|
|
|
|
if (!sr_class || !(sr_class->disable)) {
|
|
dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not"
|
|
"registered\n", __func__);
|
|
return;
|
|
}
|
|
|
|
sr_class->disable(voltdm, 1);
|
|
}
|
|
|
|
/**
|
|
* omap_sr_register_pmic() - API to register pmic specific info.
|
|
* @pmic_data: The structure containing pmic specific data.
|
|
*
|
|
* This API is to be called from the PMIC specific code to register with
|
|
* smartreflex driver pmic specific info. Currently the only info required
|
|
* is the smartreflex init on the PMIC side.
|
|
*/
|
|
void omap_sr_register_pmic(struct omap_sr_pmic_data *pmic_data)
|
|
{
|
|
if (!pmic_data) {
|
|
pr_warning("%s: Trying to register NULL PMIC data structure"
|
|
"with smartreflex\n", __func__);
|
|
return;
|
|
}
|
|
|
|
sr_pmic_data = pmic_data;
|
|
}
|
|
|
|
/* PM Debug Fs enteries to enable disable smartreflex. */
|
|
static int omap_sr_autocomp_show(void *data, u64 *val)
|
|
{
|
|
struct omap_sr *sr_info = (struct omap_sr *) data;
|
|
|
|
if (!sr_info) {
|
|
pr_warning("%s: omap_sr struct not found\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
*val = sr_info->autocomp_active;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int omap_sr_autocomp_store(void *data, u64 val)
|
|
{
|
|
struct omap_sr *sr_info = (struct omap_sr *) data;
|
|
|
|
if (!sr_info) {
|
|
pr_warning("%s: omap_sr struct not found\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Sanity check */
|
|
if (val && (val != 1)) {
|
|
pr_warning("%s: Invalid argument %lld\n", __func__, val);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* control enable/disable only if there is a delta in value */
|
|
if (sr_info->autocomp_active != val) {
|
|
if (!val)
|
|
sr_stop_vddautocomp(sr_info);
|
|
else
|
|
sr_start_vddautocomp(sr_info);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
DEFINE_SIMPLE_ATTRIBUTE(pm_sr_fops, omap_sr_autocomp_show,
|
|
omap_sr_autocomp_store, "%llu\n");
|
|
|
|
static int __init omap_sr_probe(struct platform_device *pdev)
|
|
{
|
|
struct omap_sr *sr_info = kzalloc(sizeof(struct omap_sr), GFP_KERNEL);
|
|
struct omap_sr_data *pdata = pdev->dev.platform_data;
|
|
struct resource *mem, *irq;
|
|
struct dentry *vdd_dbg_dir, *nvalue_dir;
|
|
struct omap_volt_data *volt_data;
|
|
int i, ret = 0;
|
|
|
|
if (!sr_info) {
|
|
dev_err(&pdev->dev, "%s: unable to allocate sr_info\n",
|
|
__func__);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (!pdata) {
|
|
dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
|
|
ret = -EINVAL;
|
|
goto err_free_devinfo;
|
|
}
|
|
|
|
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!mem) {
|
|
dev_err(&pdev->dev, "%s: no mem resource\n", __func__);
|
|
ret = -ENODEV;
|
|
goto err_free_devinfo;
|
|
}
|
|
|
|
mem = request_mem_region(mem->start, resource_size(mem),
|
|
dev_name(&pdev->dev));
|
|
if (!mem) {
|
|
dev_err(&pdev->dev, "%s: no mem region\n", __func__);
|
|
ret = -EBUSY;
|
|
goto err_free_devinfo;
|
|
}
|
|
|
|
irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
|
|
|
|
pm_runtime_enable(&pdev->dev);
|
|
|
|
sr_info->pdev = pdev;
|
|
sr_info->srid = pdev->id;
|
|
sr_info->voltdm = pdata->voltdm;
|
|
sr_info->nvalue_table = pdata->nvalue_table;
|
|
sr_info->nvalue_count = pdata->nvalue_count;
|
|
sr_info->senn_mod = pdata->senn_mod;
|
|
sr_info->senp_mod = pdata->senp_mod;
|
|
sr_info->autocomp_active = false;
|
|
sr_info->ip_type = pdata->ip_type;
|
|
sr_info->base = ioremap(mem->start, resource_size(mem));
|
|
if (!sr_info->base) {
|
|
dev_err(&pdev->dev, "%s: ioremap fail\n", __func__);
|
|
ret = -ENOMEM;
|
|
goto err_release_region;
|
|
}
|
|
|
|
if (irq)
|
|
sr_info->irq = irq->start;
|
|
|
|
sr_set_clk_length(sr_info);
|
|
sr_set_regfields(sr_info);
|
|
|
|
list_add(&sr_info->node, &sr_list);
|
|
|
|
/*
|
|
* Call into late init to do intializations that require
|
|
* both sr driver and sr class driver to be initiallized.
|
|
*/
|
|
if (sr_class) {
|
|
ret = sr_late_init(sr_info);
|
|
if (ret) {
|
|
pr_warning("%s: Error in SR late init\n", __func__);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
dev_info(&pdev->dev, "%s: SmartReflex driver initialized\n", __func__);
|
|
|
|
/*
|
|
* If the voltage domain debugfs directory is not created, do
|
|
* not try to create rest of the debugfs entries.
|
|
*/
|
|
vdd_dbg_dir = omap_voltage_get_dbgdir(sr_info->voltdm);
|
|
if (!vdd_dbg_dir) {
|
|
ret = -EINVAL;
|
|
goto err_iounmap;
|
|
}
|
|
|
|
sr_info->dbg_dir = debugfs_create_dir("smartreflex", vdd_dbg_dir);
|
|
if (IS_ERR(sr_info->dbg_dir)) {
|
|
dev_err(&pdev->dev, "%s: Unable to create debugfs directory\n",
|
|
__func__);
|
|
ret = PTR_ERR(sr_info->dbg_dir);
|
|
goto err_iounmap;
|
|
}
|
|
|
|
(void) debugfs_create_file("autocomp", S_IRUGO | S_IWUSR,
|
|
sr_info->dbg_dir, (void *)sr_info, &pm_sr_fops);
|
|
(void) debugfs_create_x32("errweight", S_IRUGO, sr_info->dbg_dir,
|
|
&sr_info->err_weight);
|
|
(void) debugfs_create_x32("errmaxlimit", S_IRUGO, sr_info->dbg_dir,
|
|
&sr_info->err_maxlimit);
|
|
(void) debugfs_create_x32("errminlimit", S_IRUGO, sr_info->dbg_dir,
|
|
&sr_info->err_minlimit);
|
|
|
|
nvalue_dir = debugfs_create_dir("nvalue", sr_info->dbg_dir);
|
|
if (IS_ERR(nvalue_dir)) {
|
|
dev_err(&pdev->dev, "%s: Unable to create debugfs directory"
|
|
"for n-values\n", __func__);
|
|
ret = PTR_ERR(nvalue_dir);
|
|
goto err_debugfs;
|
|
}
|
|
|
|
omap_voltage_get_volttable(sr_info->voltdm, &volt_data);
|
|
if (!volt_data) {
|
|
dev_warn(&pdev->dev, "%s: No Voltage table for the"
|
|
" corresponding vdd vdd_%s. Cannot create debugfs"
|
|
"entries for n-values\n",
|
|
__func__, sr_info->voltdm->name);
|
|
ret = -ENODATA;
|
|
goto err_debugfs;
|
|
}
|
|
|
|
for (i = 0; i < sr_info->nvalue_count; i++) {
|
|
char name[NVALUE_NAME_LEN + 1];
|
|
|
|
snprintf(name, sizeof(name), "volt_%d",
|
|
volt_data[i].volt_nominal);
|
|
(void) debugfs_create_x32(name, S_IRUGO | S_IWUSR, nvalue_dir,
|
|
&(sr_info->nvalue_table[i].nvalue));
|
|
}
|
|
|
|
return ret;
|
|
|
|
err_debugfs:
|
|
debugfs_remove_recursive(sr_info->dbg_dir);
|
|
err_iounmap:
|
|
list_del(&sr_info->node);
|
|
iounmap(sr_info->base);
|
|
err_release_region:
|
|
release_mem_region(mem->start, resource_size(mem));
|
|
err_free_devinfo:
|
|
kfree(sr_info);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __devexit omap_sr_remove(struct platform_device *pdev)
|
|
{
|
|
struct omap_sr_data *pdata = pdev->dev.platform_data;
|
|
struct omap_sr *sr_info;
|
|
struct resource *mem;
|
|
|
|
if (!pdata) {
|
|
dev_err(&pdev->dev, "%s: platform data missing\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
sr_info = _sr_lookup(pdata->voltdm);
|
|
if (IS_ERR(sr_info)) {
|
|
dev_warn(&pdev->dev, "%s: omap_sr struct not found\n",
|
|
__func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (sr_info->autocomp_active)
|
|
sr_stop_vddautocomp(sr_info);
|
|
if (sr_info->dbg_dir)
|
|
debugfs_remove_recursive(sr_info->dbg_dir);
|
|
|
|
list_del(&sr_info->node);
|
|
iounmap(sr_info->base);
|
|
kfree(sr_info);
|
|
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
release_mem_region(mem->start, resource_size(mem));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver smartreflex_driver = {
|
|
.remove = omap_sr_remove,
|
|
.driver = {
|
|
.name = "smartreflex",
|
|
},
|
|
};
|
|
|
|
static int __init sr_init(void)
|
|
{
|
|
int ret = 0;
|
|
|
|
/*
|
|
* sr_init is a late init. If by then a pmic specific API is not
|
|
* registered either there is no need for anything to be done on
|
|
* the PMIC side or somebody has forgotten to register a PMIC
|
|
* handler. Warn for the second condition.
|
|
*/
|
|
if (sr_pmic_data && sr_pmic_data->sr_pmic_init)
|
|
sr_pmic_data->sr_pmic_init();
|
|
else
|
|
pr_warning("%s: No PMIC hook to init smartreflex\n", __func__);
|
|
|
|
ret = platform_driver_probe(&smartreflex_driver, omap_sr_probe);
|
|
if (ret) {
|
|
pr_err("%s: platform driver register failed for SR\n",
|
|
__func__);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit sr_exit(void)
|
|
{
|
|
platform_driver_unregister(&smartreflex_driver);
|
|
}
|
|
late_initcall(sr_init);
|
|
module_exit(sr_exit);
|
|
|
|
MODULE_DESCRIPTION("OMAP Smartreflex Driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:" DRIVER_NAME);
|
|
MODULE_AUTHOR("Texas Instruments Inc");
|