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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 | */ | |
20 | ||
21 | #include <linux/err.h> | |
22 | #include <linux/slab.h> | |
b35cecf9 | 23 | #include <linux/io.h> |
0c0a5d61 TG |
24 | |
25 | #include <plat/omap_device.h> | |
0c0a5d61 TG |
26 | #include <plat/voltage.h> |
27 | ||
7328ff4d | 28 | #include "smartreflex.h" |
0c0a5d61 | 29 | #include "control.h" |
d0eadf6d | 30 | #include "pm.h" |
0c0a5d61 TG |
31 | |
32 | static bool sr_enable_on_init; | |
33 | ||
34 | static struct omap_device_pm_latency omap_sr_latency[] = { | |
35 | { | |
36 | .deactivate_func = omap_device_idle_hwmods, | |
37 | .activate_func = omap_device_enable_hwmods, | |
38 | .flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST | |
39 | }, | |
40 | }; | |
41 | ||
42 | /* Read EFUSE values from control registers for OMAP3430 */ | |
43 | static void __init sr_set_nvalues(struct omap_volt_data *volt_data, | |
44 | struct omap_sr_data *sr_data) | |
45 | { | |
46 | struct omap_sr_nvalue_table *nvalue_table; | |
47 | int i, count = 0; | |
48 | ||
49 | while (volt_data[count].volt_nominal) | |
50 | count++; | |
51 | ||
52 | nvalue_table = kzalloc(sizeof(struct omap_sr_nvalue_table)*count, | |
53 | GFP_KERNEL); | |
54 | ||
55 | for (i = 0; i < count; i++) { | |
b35cecf9 TG |
56 | u32 v; |
57 | /* | |
58 | * In OMAP4 the efuse registers are 24 bit aligned. | |
59 | * A __raw_readl will fail for non-32 bit aligned address | |
60 | * and hence the 8-bit read and shift. | |
61 | */ | |
62 | if (cpu_is_omap44xx()) { | |
63 | u16 offset = volt_data[i].sr_efuse_offs; | |
64 | ||
65 | v = omap_ctrl_readb(offset) | | |
66 | omap_ctrl_readb(offset + 1) << 8 | | |
67 | omap_ctrl_readb(offset + 2) << 16; | |
68 | } else { | |
69 | v = omap_ctrl_readl(volt_data[i].sr_efuse_offs); | |
70 | } | |
0c0a5d61 TG |
71 | |
72 | nvalue_table[i].efuse_offs = volt_data[i].sr_efuse_offs; | |
73 | nvalue_table[i].nvalue = v; | |
74 | } | |
75 | ||
76 | sr_data->nvalue_table = nvalue_table; | |
77 | sr_data->nvalue_count = count; | |
78 | } | |
79 | ||
80 | static int sr_dev_init(struct omap_hwmod *oh, void *user) | |
81 | { | |
82 | struct omap_sr_data *sr_data; | |
83 | struct omap_device *od; | |
84 | struct omap_volt_data *volt_data; | |
85 | char *name = "smartreflex"; | |
86 | static int i; | |
87 | ||
88 | sr_data = kzalloc(sizeof(struct omap_sr_data), GFP_KERNEL); | |
89 | if (!sr_data) { | |
90 | pr_err("%s: Unable to allocate memory for %s sr_data.Error!\n", | |
91 | __func__, oh->name); | |
92 | return -ENOMEM; | |
93 | } | |
94 | ||
95 | if (!oh->vdd_name) { | |
96 | pr_err("%s: No voltage domain specified for %s." | |
97 | "Cannot initialize\n", __func__, oh->name); | |
98 | goto exit; | |
99 | } | |
100 | ||
101 | sr_data->ip_type = oh->class->rev; | |
102 | sr_data->senn_mod = 0x1; | |
103 | sr_data->senp_mod = 0x1; | |
104 | ||
105 | sr_data->voltdm = omap_voltage_domain_lookup(oh->vdd_name); | |
106 | if (IS_ERR(sr_data->voltdm)) { | |
107 | pr_err("%s: Unable to get voltage domain pointer for VDD %s\n", | |
108 | __func__, oh->vdd_name); | |
109 | goto exit; | |
110 | } | |
111 | ||
112 | omap_voltage_get_volttable(sr_data->voltdm, &volt_data); | |
113 | if (!volt_data) { | |
114 | pr_warning("%s: No Voltage table registerd fo VDD%d." | |
115 | "Something really wrong\n\n", __func__, i + 1); | |
116 | goto exit; | |
117 | } | |
118 | ||
119 | sr_set_nvalues(volt_data, sr_data); | |
120 | ||
121 | sr_data->enable_on_init = sr_enable_on_init; | |
122 | ||
123 | od = omap_device_build(name, i, oh, sr_data, sizeof(*sr_data), | |
124 | omap_sr_latency, | |
125 | ARRAY_SIZE(omap_sr_latency), 0); | |
126 | if (IS_ERR(od)) | |
127 | pr_warning("%s: Could not build omap_device for %s: %s.\n\n", | |
128 | __func__, name, oh->name); | |
129 | exit: | |
130 | i++; | |
131 | kfree(sr_data); | |
132 | return 0; | |
133 | } | |
134 | ||
135 | /* | |
136 | * API to be called from board files to enable smartreflex | |
137 | * autocompensation at init. | |
138 | */ | |
139 | void __init omap_enable_smartreflex_on_init(void) | |
140 | { | |
141 | sr_enable_on_init = true; | |
142 | } | |
143 | ||
144 | int __init omap_devinit_smartreflex(void) | |
145 | { | |
146 | return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL); | |
147 | } |