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/*
* OMAP3/OMAP4 smartreflex device file
*
* Author: Thara Gopinath <thara@ti.com>
*
* Based originally on code from smartreflex.c
* Copyright (C) 2010 Texas Instruments, Inc.
* Thara Gopinath <thara@ti.com>
*
* Copyright (C) 2008 Nokia Corporation
* Kalle Jokiniemi
*
* Copyright (C) 2007 Texas Instruments, Inc.
* Lesly A M <x0080970@ti.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/power/smartreflex.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/io.h>
#include "omap_device.h"
#include "voltage.h"
#include "control.h"
#include "pm.h"
static bool sr_enable_on_init;
/* Read EFUSE values from control registers for OMAP3430 */
static void __init sr_set_nvalues(struct omap_volt_data *volt_data,
struct omap_sr_data *sr_data)
{
struct omap_sr_nvalue_table *nvalue_table;
int i, j, count = 0;
sr_data->nvalue_count = 0;
sr_data->nvalue_table = NULL;
while (volt_data[count].volt_nominal)
count++;
nvalue_table = kzalloc(sizeof(struct omap_sr_nvalue_table)*count,
GFP_KERNEL);
if (!nvalue_table) {
pr_err("OMAP: SmartReflex: cannot allocate memory for n-value table\n");
return;
}
for (i = 0, j = 0; i < count; i++) {
u32 v;
/*
* In OMAP4 the efuse registers are 24 bit aligned.
* A __raw_readl will fail for non-32 bit aligned address
* and hence the 8-bit read and shift.
*/
if (cpu_is_omap44xx()) {
u16 offset = volt_data[i].sr_efuse_offs;
v = omap_ctrl_readb(offset) |
omap_ctrl_readb(offset + 1) << 8 |
omap_ctrl_readb(offset + 2) << 16;
} else {
v = omap_ctrl_readl(volt_data[i].sr_efuse_offs);
}
/*
* Many OMAP SoCs don't have the eFuse values set.
* For example, pretty much all OMAP3xxx before
* ES3.something.
*
* XXX There needs to be some way for board files or
* userspace to add these in.
*/
if (v == 0)
continue;
nvalue_table[j].nvalue = v;
nvalue_table[j].efuse_offs = volt_data[i].sr_efuse_offs;
nvalue_table[j].errminlimit = volt_data[i].sr_errminlimit;
nvalue_table[j].volt_nominal = volt_data[i].volt_nominal;
j++;
}
sr_data->nvalue_table = nvalue_table;
sr_data->nvalue_count = j;
}
static int __init sr_dev_init(struct omap_hwmod *oh, void *user)
{
struct omap_sr_data *sr_data;
struct platform_device *pdev;
struct omap_volt_data *volt_data;
struct omap_smartreflex_dev_attr *sr_dev_attr;
char *name = "smartreflex";
static int i;
sr_data = kzalloc(sizeof(struct omap_sr_data), GFP_KERNEL);
if (!sr_data) {
pr_err("%s: Unable to allocate memory for %s sr_data\n",
__func__, oh->name);
return -ENOMEM;
}
sr_dev_attr = (struct omap_smartreflex_dev_attr *)oh->dev_attr;
if (!sr_dev_attr || !sr_dev_attr->sensor_voltdm_name) {
pr_err("%s: No voltage domain specified for %s. Cannot initialize\n",
__func__, oh->name);
goto exit;
}
sr_data->name = oh->name;
sr_data->ip_type = oh->class->rev;
sr_data->senn_mod = 0x1;
sr_data->senp_mod = 0x1;
sr_data->voltdm = voltdm_lookup(sr_dev_attr->sensor_voltdm_name);
if (!sr_data->voltdm) {
pr_err("%s: Unable to get voltage domain pointer for VDD %s\n",
__func__, sr_dev_attr->sensor_voltdm_name);
goto exit;
}
omap_voltage_get_volttable(sr_data->voltdm, &volt_data);
if (!volt_data) {
pr_err("%s: No Voltage table registered for VDD%d\n",
__func__, i + 1);
goto exit;
}
sr_set_nvalues(volt_data, sr_data);
sr_data->enable_on_init = sr_enable_on_init;
pdev = omap_device_build(name, i, oh, sr_data, sizeof(*sr_data),
NULL, 0, 0);
if (IS_ERR(pdev))
pr_warning("%s: Could not build omap_device for %s: %s.\n\n",
__func__, name, oh->name);
exit:
i++;
kfree(sr_data);
return 0;
}
/*
* API to be called from board files to enable smartreflex
* autocompensation at init.
*/
void __init omap_enable_smartreflex_on_init(void)
{
sr_enable_on_init = true;
}
int __init omap_devinit_smartreflex(void)
{
return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL);
}
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