Merge tag 'dt-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[linux-3.10.git] / arch / arm / mach-omap2 / sr_device.c
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
32 static bool sr_enable_on_init;
33
34 /* Read EFUSE values from control registers for OMAP3430 */
35 static 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 __raw_readl 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
96 static 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_warning("%s: Could not build omap_device for %s: %s.\n\n",
158                         __func__, name, oh->name);
159 exit:
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  */
169 void __init omap_enable_smartreflex_on_init(void)
170 {
171         sr_enable_on_init = true;
172 }
173
174 int __init omap_devinit_smartreflex(void)
175 {
176         return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL);
177 }