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 */
sr_set_nvalues(struct omap_volt_data * volt_data,struct omap_sr_data * sr_data)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 = kcalloc(count, sizeof(*nvalue_table), GFP_KERNEL);
48 if (!nvalue_table)
49 return;
50
51 for (i = 0, j = 0; i < count; i++) {
52 u32 v;
53
54 /*
55 * In OMAP4 the efuse registers are 24 bit aligned.
56 * A readl_relaxed will fail for non-32 bit aligned address
57 * and hence the 8-bit read and shift.
58 */
59 if (cpu_is_omap44xx()) {
60 u16 offset = volt_data[i].sr_efuse_offs;
61
62 v = omap_ctrl_readb(offset) |
63 omap_ctrl_readb(offset + 1) << 8 |
64 omap_ctrl_readb(offset + 2) << 16;
65 } else {
66 v = omap_ctrl_readl(volt_data[i].sr_efuse_offs);
67 }
68
69 /*
70 * Many OMAP SoCs don't have the eFuse values set.
71 * For example, pretty much all OMAP3xxx before
72 * ES3.something.
73 *
74 * XXX There needs to be some way for board files or
75 * userspace to add these in.
76 */
77 if (v == 0)
78 continue;
79
80 nvalue_table[j].nvalue = v;
81 nvalue_table[j].efuse_offs = volt_data[i].sr_efuse_offs;
82 nvalue_table[j].errminlimit = volt_data[i].sr_errminlimit;
83 nvalue_table[j].volt_nominal = volt_data[i].volt_nominal;
84
85 j++;
86 }
87
88 sr_data->nvalue_table = nvalue_table;
89 sr_data->nvalue_count = j;
90 }
91
sr_dev_init(struct omap_hwmod * oh,void * user)92 static int __init sr_dev_init(struct omap_hwmod *oh, void *user)
93 {
94 struct omap_sr_data *sr_data;
95 struct platform_device *pdev;
96 struct omap_volt_data *volt_data;
97 struct omap_smartreflex_dev_attr *sr_dev_attr;
98 char *name = "smartreflex";
99 static int i;
100
101 sr_data = kzalloc(sizeof(*sr_data), GFP_KERNEL);
102 if (!sr_data)
103 return -ENOMEM;
104
105 sr_dev_attr = (struct omap_smartreflex_dev_attr *)oh->dev_attr;
106 if (!sr_dev_attr || !sr_dev_attr->sensor_voltdm_name) {
107 pr_err("%s: No voltage domain specified for %s. Cannot initialize\n",
108 __func__, oh->name);
109 goto exit;
110 }
111
112 sr_data->name = oh->name;
113 sr_data->ip_type = oh->class->rev;
114 sr_data->senn_mod = 0x1;
115 sr_data->senp_mod = 0x1;
116
117 if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
118 sr_data->err_weight = OMAP3430_SR_ERRWEIGHT;
119 sr_data->err_maxlimit = OMAP3430_SR_ERRMAXLIMIT;
120 sr_data->accum_data = OMAP3430_SR_ACCUMDATA;
121 if (!(strcmp(sr_data->name, "smartreflex_mpu"))) {
122 sr_data->senn_avgweight = OMAP3430_SR1_SENNAVGWEIGHT;
123 sr_data->senp_avgweight = OMAP3430_SR1_SENPAVGWEIGHT;
124 } else {
125 sr_data->senn_avgweight = OMAP3430_SR2_SENNAVGWEIGHT;
126 sr_data->senp_avgweight = OMAP3430_SR2_SENPAVGWEIGHT;
127 }
128 }
129
130 sr_data->voltdm = voltdm_lookup(sr_dev_attr->sensor_voltdm_name);
131 if (!sr_data->voltdm) {
132 pr_err("%s: Unable to get voltage domain pointer for VDD %s\n",
133 __func__, sr_dev_attr->sensor_voltdm_name);
134 goto exit;
135 }
136
137 omap_voltage_get_volttable(sr_data->voltdm, &volt_data);
138 if (!volt_data) {
139 pr_err("%s: No Voltage table registered for VDD%d\n",
140 __func__, i + 1);
141 goto exit;
142 }
143
144 sr_set_nvalues(volt_data, sr_data);
145
146 sr_data->enable_on_init = sr_enable_on_init;
147
148 pdev = omap_device_build(name, i, oh, sr_data, sizeof(*sr_data));
149 if (IS_ERR(pdev))
150 pr_warn("%s: Could not build omap_device for %s: %s\n",
151 __func__, name, oh->name);
152 exit:
153 i++;
154 kfree(sr_data);
155 return 0;
156 }
157
158 /*
159 * API to be called from board files to enable smartreflex
160 * autocompensation at init.
161 */
omap_enable_smartreflex_on_init(void)162 void __init omap_enable_smartreflex_on_init(void)
163 {
164 sr_enable_on_init = true;
165 }
166
omap_devinit_smartreflex(void)167 int __init omap_devinit_smartreflex(void)
168 {
169 return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL);
170 }
171