2 * OMAP3/OMAP4 smartreflex device file
4 * Author: Thara Gopinath <thara@ti.com>
6 * Based originally on code from smartreflex.c
7 * Copyright (C) 2010 Texas Instruments, Inc.
8 * Thara Gopinath <thara@ti.com>
10 * Copyright (C) 2008 Nokia Corporation
13 * Copyright (C) 2007 Texas Instruments, Inc.
14 * Lesly A M <x0080970@ti.com>
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.
20 #include <linux/power/smartreflex.h>
22 #include <linux/err.h>
23 #include <linux/slab.h>
27 #include "omap_device.h"
32 static bool sr_enable_on_init
;
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
)
38 struct omap_sr_nvalue_table
*nvalue_table
;
41 sr_data
->nvalue_count
= 0;
42 sr_data
->nvalue_table
= NULL
;
44 while (volt_data
[count
].volt_nominal
)
47 nvalue_table
= kzalloc(sizeof(struct omap_sr_nvalue_table
)*count
,
51 pr_err("OMAP: SmartReflex: cannot allocate memory for n-value table\n");
55 for (i
= 0, j
= 0; i
< count
; i
++) {
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.
63 if (cpu_is_omap44xx()) {
64 u16 offset
= volt_data
[i
].sr_efuse_offs
;
66 v
= omap_ctrl_readb(offset
) |
67 omap_ctrl_readb(offset
+ 1) << 8 |
68 omap_ctrl_readb(offset
+ 2) << 16;
70 v
= omap_ctrl_readl(volt_data
[i
].sr_efuse_offs
);
74 * Many OMAP SoCs don't have the eFuse values set.
75 * For example, pretty much all OMAP3xxx before
78 * XXX There needs to be some way for board files or
79 * userspace to add these in.
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
;
92 sr_data
->nvalue_table
= nvalue_table
;
93 sr_data
->nvalue_count
= j
;
96 static int __init
sr_dev_init(struct omap_hwmod
*oh
, void *user
)
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";
105 sr_data
= kzalloc(sizeof(struct omap_sr_data
), GFP_KERNEL
);
107 pr_err("%s: Unable to allocate memory for %s sr_data\n",
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",
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;
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
;
132 sr_data
->senn_avgweight
= OMAP3430_SR2_SENNAVGWEIGHT
;
133 sr_data
->senp_avgweight
= OMAP3430_SR2_SENPAVGWEIGHT
;
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
);
144 omap_voltage_get_volttable(sr_data
->voltdm
, &volt_data
);
146 pr_err("%s: No Voltage table registered for VDD%d\n",
151 sr_set_nvalues(volt_data
, sr_data
);
153 sr_data
->enable_on_init
= sr_enable_on_init
;
155 pdev
= omap_device_build(name
, i
, oh
, sr_data
, sizeof(*sr_data
));
157 pr_warning("%s: Could not build omap_device for %s: %s.\n\n",
158 __func__
, name
, oh
->name
);
166 * API to be called from board files to enable smartreflex
167 * autocompensation at init.
169 void __init
omap_enable_smartreflex_on_init(void)
171 sr_enable_on_init
= true;
174 int __init
omap_devinit_smartreflex(void)
176 return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init
, NULL
);