Commit | Line | Data |
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0c0a5d61 TG |
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 | */ | |
b86aeafc | 20 | #include <linux/power/smartreflex.h> |
0c0a5d61 TG |
21 | |
22 | #include <linux/err.h> | |
23 | #include <linux/slab.h> | |
b35cecf9 | 24 | #include <linux/io.h> |
0c0a5d61 TG |
25 | |
26 | #include <plat/omap_device.h> | |
0c0a5d61 | 27 | |
e1d6f472 | 28 | #include "voltage.h" |
0c0a5d61 | 29 | #include "control.h" |
d0eadf6d | 30 | #include "pm.h" |
0c0a5d61 TG |
31 | |
32 | static bool sr_enable_on_init; | |
33 | ||
0c0a5d61 TG |
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; | |
5e7f2e12 JP |
39 | int i, j, count = 0; |
40 | ||
41 | sr_data->nvalue_count = 0; | |
42 | sr_data->nvalue_table = NULL; | |
0c0a5d61 TG |
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 | ||
5e7f2e12 JP |
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++) { | |
b35cecf9 | 56 | u32 v; |
5e7f2e12 | 57 | |
b35cecf9 TG |
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 { | |
5e7f2e12 | 70 | v = omap_ctrl_readl(volt_data[i].sr_efuse_offs); |
b35cecf9 | 71 | } |
0c0a5d61 | 72 | |
5e7f2e12 JP |
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++; | |
0c0a5d61 TG |
90 | } |
91 | ||
92 | sr_data->nvalue_table = nvalue_table; | |
5e7f2e12 | 93 | sr_data->nvalue_count = j; |
0c0a5d61 TG |
94 | } |
95 | ||
9cf793f9 | 96 | static int __init sr_dev_init(struct omap_hwmod *oh, void *user) |
0c0a5d61 TG |
97 | { |
98 | struct omap_sr_data *sr_data; | |
3528c58e | 99 | struct platform_device *pdev; |
0c0a5d61 | 100 | struct omap_volt_data *volt_data; |
cea6b942 | 101 | struct omap_smartreflex_dev_attr *sr_dev_attr; |
0c0a5d61 TG |
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.Error!\n", | |
108 | __func__, oh->name); | |
109 | return -ENOMEM; | |
110 | } | |
111 | ||
cea6b942 SG |
112 | sr_dev_attr = (struct omap_smartreflex_dev_attr *)oh->dev_attr; |
113 | if (!sr_dev_attr || !sr_dev_attr->sensor_voltdm_name) { | |
0c0a5d61 | 114 | pr_err("%s: No voltage domain specified for %s." |
cea6b942 SG |
115 | "Cannot initialize\n", __func__, |
116 | oh->name); | |
0c0a5d61 TG |
117 | goto exit; |
118 | } | |
119 | ||
8b765d72 | 120 | sr_data->name = oh->name; |
0c0a5d61 TG |
121 | sr_data->ip_type = oh->class->rev; |
122 | sr_data->senn_mod = 0x1; | |
123 | sr_data->senp_mod = 0x1; | |
124 | ||
cea6b942 | 125 | sr_data->voltdm = voltdm_lookup(sr_dev_attr->sensor_voltdm_name); |
0c0a5d61 TG |
126 | if (IS_ERR(sr_data->voltdm)) { |
127 | pr_err("%s: Unable to get voltage domain pointer for VDD %s\n", | |
cea6b942 | 128 | __func__, sr_dev_attr->sensor_voltdm_name); |
0c0a5d61 TG |
129 | goto exit; |
130 | } | |
131 | ||
132 | omap_voltage_get_volttable(sr_data->voltdm, &volt_data); | |
133 | if (!volt_data) { | |
260db902 | 134 | pr_warning("%s: No Voltage table registered fo VDD%d." |
0c0a5d61 TG |
135 | "Something really wrong\n\n", __func__, i + 1); |
136 | goto exit; | |
137 | } | |
138 | ||
139 | sr_set_nvalues(volt_data, sr_data); | |
140 | ||
141 | sr_data->enable_on_init = sr_enable_on_init; | |
142 | ||
3528c58e | 143 | pdev = omap_device_build(name, i, oh, sr_data, sizeof(*sr_data), |
f718e2c0 | 144 | NULL, 0, 0); |
3528c58e | 145 | if (IS_ERR(pdev)) |
0c0a5d61 TG |
146 | pr_warning("%s: Could not build omap_device for %s: %s.\n\n", |
147 | __func__, name, oh->name); | |
148 | exit: | |
149 | i++; | |
150 | kfree(sr_data); | |
151 | return 0; | |
152 | } | |
153 | ||
154 | /* | |
155 | * API to be called from board files to enable smartreflex | |
156 | * autocompensation at init. | |
157 | */ | |
158 | void __init omap_enable_smartreflex_on_init(void) | |
159 | { | |
160 | sr_enable_on_init = true; | |
161 | } | |
162 | ||
163 | int __init omap_devinit_smartreflex(void) | |
164 | { | |
165 | return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL); | |
166 | } |