1/*
2 * OMAP3/OMAP4 smartreflex device file
3 *
4 * Author: Thara Gopinath	<thara@ti.com>
5 *
6 * Based originally on code from smartreflex.c
7 * Copyright (C) 2010 Texas Instruments, Inc.
8 * Thara Gopinath <thara@ti.com>
9 *
10 * Copyright (C) 2008 Nokia Corporation
11 * Kalle Jokiniemi
12 *
13 * Copyright (C) 2007 Texas Instruments, Inc.
14 * Lesly A M <x0080970@ti.com>
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2 as
18 * published by the Free Software Foundation.
19 */
20#include <linux/power/smartreflex.h>
21
22#include <linux/err.h>
23#include <linux/slab.h>
24#include <linux/io.h>
25
26#include "soc.h"
27#include "omap_device.h"
28#include "voltage.h"
29#include "control.h"
30#include "pm.h"
31
32static bool sr_enable_on_init;
33
34/* Read EFUSE values from control registers for OMAP3430 */
35static void __init sr_set_nvalues(struct omap_volt_data *volt_data,
36				struct omap_sr_data *sr_data)
37{
38	struct omap_sr_nvalue_table *nvalue_table;
39	int i, j, count = 0;
40
41	sr_data->nvalue_count = 0;
42	sr_data->nvalue_table = NULL;
43
44	while (volt_data[count].volt_nominal)
45		count++;
46
47	nvalue_table = kzalloc(sizeof(struct omap_sr_nvalue_table)*count,
48			GFP_KERNEL);
49
50	if (!nvalue_table) {
51		pr_err("OMAP: SmartReflex: cannot allocate memory for n-value table\n");
52		return;
53	}
54
55	for (i = 0, j = 0; i < count; i++) {
56		u32 v;
57
58		/*
59		 * In OMAP4 the efuse registers are 24 bit aligned.
60		 * A readl_relaxed will fail for non-32 bit aligned address
61		 * and hence the 8-bit read and shift.
62		 */
63		if (cpu_is_omap44xx()) {
64			u16 offset = volt_data[i].sr_efuse_offs;
65
66			v = omap_ctrl_readb(offset) |
67				omap_ctrl_readb(offset + 1) << 8 |
68				omap_ctrl_readb(offset + 2) << 16;
69		} else {
70			v = omap_ctrl_readl(volt_data[i].sr_efuse_offs);
71		}
72
73		/*
74		 * Many OMAP SoCs don't have the eFuse values set.
75		 * For example, pretty much all OMAP3xxx before
76		 * ES3.something.
77		 *
78		 * XXX There needs to be some way for board files or
79		 * userspace to add these in.
80		 */
81		if (v == 0)
82			continue;
83
84		nvalue_table[j].nvalue = v;
85		nvalue_table[j].efuse_offs = volt_data[i].sr_efuse_offs;
86		nvalue_table[j].errminlimit = volt_data[i].sr_errminlimit;
87		nvalue_table[j].volt_nominal = volt_data[i].volt_nominal;
88
89		j++;
90	}
91
92	sr_data->nvalue_table = nvalue_table;
93	sr_data->nvalue_count = j;
94}
95
96static int __init sr_dev_init(struct omap_hwmod *oh, void *user)
97{
98	struct omap_sr_data *sr_data;
99	struct platform_device *pdev;
100	struct omap_volt_data *volt_data;
101	struct omap_smartreflex_dev_attr *sr_dev_attr;
102	char *name = "smartreflex";
103	static int i;
104
105	sr_data = kzalloc(sizeof(struct omap_sr_data), GFP_KERNEL);
106	if (!sr_data) {
107		pr_err("%s: Unable to allocate memory for %s sr_data\n",
108		       __func__, oh->name);
109		return -ENOMEM;
110	}
111
112	sr_dev_attr = (struct omap_smartreflex_dev_attr *)oh->dev_attr;
113	if (!sr_dev_attr || !sr_dev_attr->sensor_voltdm_name) {
114		pr_err("%s: No voltage domain specified for %s. Cannot initialize\n",
115		       __func__, oh->name);
116		goto exit;
117	}
118
119	sr_data->name = oh->name;
120	sr_data->ip_type = oh->class->rev;
121	sr_data->senn_mod = 0x1;
122	sr_data->senp_mod = 0x1;
123
124	if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
125		sr_data->err_weight = OMAP3430_SR_ERRWEIGHT;
126		sr_data->err_maxlimit = OMAP3430_SR_ERRMAXLIMIT;
127		sr_data->accum_data = OMAP3430_SR_ACCUMDATA;
128		if (!(strcmp(sr_data->name, "smartreflex_mpu"))) {
129			sr_data->senn_avgweight = OMAP3430_SR1_SENNAVGWEIGHT;
130			sr_data->senp_avgweight = OMAP3430_SR1_SENPAVGWEIGHT;
131		} else {
132			sr_data->senn_avgweight = OMAP3430_SR2_SENNAVGWEIGHT;
133			sr_data->senp_avgweight = OMAP3430_SR2_SENPAVGWEIGHT;
134		}
135	}
136
137	sr_data->voltdm = voltdm_lookup(sr_dev_attr->sensor_voltdm_name);
138	if (!sr_data->voltdm) {
139		pr_err("%s: Unable to get voltage domain pointer for VDD %s\n",
140			__func__, sr_dev_attr->sensor_voltdm_name);
141		goto exit;
142	}
143
144	omap_voltage_get_volttable(sr_data->voltdm, &volt_data);
145	if (!volt_data) {
146		pr_err("%s: No Voltage table registered for VDD%d\n",
147		       __func__, i + 1);
148		goto exit;
149	}
150
151	sr_set_nvalues(volt_data, sr_data);
152
153	sr_data->enable_on_init = sr_enable_on_init;
154
155	pdev = omap_device_build(name, i, oh, sr_data, sizeof(*sr_data));
156	if (IS_ERR(pdev))
157		pr_warn("%s: Could not build omap_device for %s: %s\n",
158			__func__, name, oh->name);
159exit:
160	i++;
161	kfree(sr_data);
162	return 0;
163}
164
165/*
166 * API to be called from board files to enable smartreflex
167 * autocompensation at init.
168 */
169void __init omap_enable_smartreflex_on_init(void)
170{
171	sr_enable_on_init = true;
172}
173
174int __init omap_devinit_smartreflex(void)
175{
176	return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL);
177}
178