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>
26 #include <plat/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 __raw_readl 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.Error!\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."
115 "Cannot initialize\n", __func__,
120 sr_data->name = oh->name;
121 sr_data->ip_type = oh->class->rev;
122 sr_data->senn_mod = 0x1;
123 sr_data->senp_mod = 0x1;
125 sr_data->voltdm = voltdm_lookup(sr_dev_attr->sensor_voltdm_name);
126 if (!sr_data->voltdm) {
127 pr_err("%s: Unable to get voltage domain pointer for VDD %s\n",
128 __func__, sr_dev_attr->sensor_voltdm_name);
132 omap_voltage_get_volttable(sr_data->voltdm, &volt_data);
134 pr_warning("%s: No Voltage table registered fo VDD%d."
135 "Something really wrong\n\n", __func__, i + 1);
139 sr_set_nvalues(volt_data, sr_data);
141 sr_data->enable_on_init = sr_enable_on_init;
143 pdev = omap_device_build(name, i, oh, sr_data, sizeof(*sr_data),
146 pr_warning("%s: Could not build omap_device for %s: %s.\n\n",
147 __func__, name, oh->name);
155 * API to be called from board files to enable smartreflex
156 * autocompensation at init.
158 void __init omap_enable_smartreflex_on_init(void)
160 sr_enable_on_init = true;
163 int __init omap_devinit_smartreflex(void)
165 return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL);