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.
21 #include <linux/err.h>
22 #include <linux/slab.h>
25 #include <plat/omap_device.h>
27 #include "smartreflex.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 while (volt_data[count].volt_nominal)
44 nvalue_table = kzalloc(sizeof(struct omap_sr_nvalue_table)*count,
47 for (i = 0; i < count; i++) {
50 * In OMAP4 the efuse registers are 24 bit aligned.
51 * A __raw_readl will fail for non-32 bit aligned address
52 * and hence the 8-bit read and shift.
54 if (cpu_is_omap44xx()) {
55 u16 offset = volt_data[i].sr_efuse_offs;
57 v = omap_ctrl_readb(offset) |
58 omap_ctrl_readb(offset + 1) << 8 |
59 omap_ctrl_readb(offset + 2) << 16;
61 v = omap_ctrl_readl(volt_data[i].sr_efuse_offs);
64 nvalue_table[i].efuse_offs = volt_data[i].sr_efuse_offs;
65 nvalue_table[i].nvalue = v;
68 sr_data->nvalue_table = nvalue_table;
69 sr_data->nvalue_count = count;
72 static int __init sr_dev_init(struct omap_hwmod *oh, void *user)
74 struct omap_sr_data *sr_data;
75 struct platform_device *pdev;
76 struct omap_volt_data *volt_data;
77 struct omap_smartreflex_dev_attr *sr_dev_attr;
78 char *name = "smartreflex";
81 sr_data = kzalloc(sizeof(struct omap_sr_data), GFP_KERNEL);
83 pr_err("%s: Unable to allocate memory for %s sr_data.Error!\n",
88 sr_dev_attr = (struct omap_smartreflex_dev_attr *)oh->dev_attr;
89 if (!sr_dev_attr || !sr_dev_attr->sensor_voltdm_name) {
90 pr_err("%s: No voltage domain specified for %s."
91 "Cannot initialize\n", __func__,
96 sr_data->ip_type = oh->class->rev;
97 sr_data->senn_mod = 0x1;
98 sr_data->senp_mod = 0x1;
100 sr_data->voltdm = voltdm_lookup(sr_dev_attr->sensor_voltdm_name);
101 if (IS_ERR(sr_data->voltdm)) {
102 pr_err("%s: Unable to get voltage domain pointer for VDD %s\n",
103 __func__, sr_dev_attr->sensor_voltdm_name);
107 omap_voltage_get_volttable(sr_data->voltdm, &volt_data);
109 pr_warning("%s: No Voltage table registerd fo VDD%d."
110 "Something really wrong\n\n", __func__, i + 1);
114 sr_set_nvalues(volt_data, sr_data);
116 sr_data->enable_on_init = sr_enable_on_init;
118 pdev = omap_device_build(name, i, oh, sr_data, sizeof(*sr_data),
121 pr_warning("%s: Could not build omap_device for %s: %s.\n\n",
122 __func__, name, oh->name);
130 * API to be called from board files to enable smartreflex
131 * autocompensation at init.
133 void __init omap_enable_smartreflex_on_init(void)
135 sr_enable_on_init = true;
138 int __init omap_devinit_smartreflex(void)
140 return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL);