1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * OMAP3/OMAP4 smartreflex device file |
4 | * |
5 | * Author: Thara Gopinath <thara@ti.com> |
6 | * |
7 | * Based originally on code from smartreflex.c |
8 | * Copyright (C) 2010 Texas Instruments, Inc. |
9 | * Thara Gopinath <thara@ti.com> |
10 | * |
11 | * Copyright (C) 2008 Nokia Corporation |
12 | * Kalle Jokiniemi |
13 | * |
14 | * Copyright (C) 2007 Texas Instruments, Inc. |
15 | * Lesly A M <x0080970@ti.com> |
16 | */ |
17 | #include <linux/power/smartreflex.h> |
18 | |
19 | #include <linux/err.h> |
20 | #include <linux/slab.h> |
21 | #include <linux/io.h> |
22 | |
23 | #include "soc.h" |
24 | #include "omap_device.h" |
25 | #include "voltage.h" |
26 | #include "control.h" |
27 | #include "pm.h" |
28 | |
29 | /* Read EFUSE values from control registers for OMAP3430 */ |
30 | static void __init sr_set_nvalues(struct omap_volt_data *volt_data, |
31 | struct omap_sr_data *sr_data) |
32 | { |
33 | struct omap_sr_nvalue_table *nvalue_table; |
34 | int i, j, count = 0; |
35 | |
36 | sr_data->nvalue_count = 0; |
37 | sr_data->nvalue_table = NULL; |
38 | |
39 | while (volt_data[count].volt_nominal) |
40 | count++; |
41 | |
42 | nvalue_table = kcalloc(n: count, size: sizeof(*nvalue_table), GFP_KERNEL); |
43 | if (!nvalue_table) |
44 | return; |
45 | |
46 | for (i = 0, j = 0; i < count; i++) { |
47 | u32 v; |
48 | |
49 | /* |
50 | * In OMAP4 the efuse registers are 24 bit aligned. |
51 | * A readl_relaxed will fail for non-32 bit aligned address |
52 | * and hence the 8-bit read and shift. |
53 | */ |
54 | if (cpu_is_omap44xx()) { |
55 | u16 offset = volt_data[i].sr_efuse_offs; |
56 | |
57 | v = omap_ctrl_readb(offset) | |
58 | omap_ctrl_readb(offset + 1) << 8 | |
59 | omap_ctrl_readb(offset + 2) << 16; |
60 | } else { |
61 | v = omap_ctrl_readl(volt_data[i].sr_efuse_offs); |
62 | } |
63 | |
64 | /* |
65 | * Many OMAP SoCs don't have the eFuse values set. |
66 | * For example, pretty much all OMAP3xxx before |
67 | * ES3.something. |
68 | * |
69 | * XXX There needs to be some way for board files or |
70 | * userspace to add these in. |
71 | */ |
72 | if (v == 0) |
73 | continue; |
74 | |
75 | nvalue_table[j].nvalue = v; |
76 | nvalue_table[j].efuse_offs = volt_data[i].sr_efuse_offs; |
77 | nvalue_table[j].errminlimit = volt_data[i].sr_errminlimit; |
78 | nvalue_table[j].volt_nominal = volt_data[i].volt_nominal; |
79 | |
80 | j++; |
81 | } |
82 | |
83 | sr_data->nvalue_table = nvalue_table; |
84 | sr_data->nvalue_count = j; |
85 | } |
86 | |
87 | extern struct omap_sr_data omap_sr_pdata[]; |
88 | |
89 | static int __init sr_init_by_name(const char *name, const char *voltdm) |
90 | { |
91 | struct omap_sr_data *sr_data = NULL; |
92 | struct omap_volt_data *volt_data; |
93 | static int i; |
94 | |
95 | if (!strncmp(name, "smartreflex_mpu_iva" , 20) || |
96 | !strncmp(name, "smartreflex_mpu" , 16)) |
97 | sr_data = &omap_sr_pdata[OMAP_SR_MPU]; |
98 | else if (!strncmp(name, "smartreflex_core" , 17)) |
99 | sr_data = &omap_sr_pdata[OMAP_SR_CORE]; |
100 | else if (!strncmp(name, "smartreflex_iva" , 16)) |
101 | sr_data = &omap_sr_pdata[OMAP_SR_IVA]; |
102 | |
103 | if (!sr_data) { |
104 | pr_err("%s: Unknown instance %s\n" , __func__, name); |
105 | return -EINVAL; |
106 | } |
107 | |
108 | sr_data->name = name; |
109 | if (cpu_is_omap343x()) |
110 | sr_data->ip_type = 1; |
111 | else |
112 | sr_data->ip_type = 2; |
113 | sr_data->senn_mod = 0x1; |
114 | sr_data->senp_mod = 0x1; |
115 | |
116 | if (cpu_is_omap34xx() || cpu_is_omap44xx()) { |
117 | sr_data->err_weight = OMAP3430_SR_ERRWEIGHT; |
118 | sr_data->err_maxlimit = OMAP3430_SR_ERRMAXLIMIT; |
119 | sr_data->accum_data = OMAP3430_SR_ACCUMDATA; |
120 | if (!(strcmp(sr_data->name, "smartreflex_mpu" ))) { |
121 | sr_data->senn_avgweight = OMAP3430_SR1_SENNAVGWEIGHT; |
122 | sr_data->senp_avgweight = OMAP3430_SR1_SENPAVGWEIGHT; |
123 | } else { |
124 | sr_data->senn_avgweight = OMAP3430_SR2_SENNAVGWEIGHT; |
125 | sr_data->senp_avgweight = OMAP3430_SR2_SENPAVGWEIGHT; |
126 | } |
127 | } |
128 | |
129 | sr_data->voltdm = voltdm_lookup(name: voltdm); |
130 | if (!sr_data->voltdm) { |
131 | pr_err("%s: Unable to get voltage domain pointer for VDD %s\n" , |
132 | __func__, voltdm); |
133 | goto exit; |
134 | } |
135 | |
136 | omap_voltage_get_volttable(voltdm: sr_data->voltdm, volt_data: &volt_data); |
137 | if (!volt_data) { |
138 | pr_err("%s: No Voltage table registered for VDD%d\n" , |
139 | __func__, i + 1); |
140 | goto exit; |
141 | } |
142 | |
143 | sr_set_nvalues(volt_data, sr_data); |
144 | |
145 | exit: |
146 | i++; |
147 | |
148 | return 0; |
149 | } |
150 | |
151 | #ifdef CONFIG_OMAP_HWMOD |
152 | static int __init sr_dev_init(struct omap_hwmod *oh, void *user) |
153 | { |
154 | struct omap_smartreflex_dev_attr *sr_dev_attr; |
155 | |
156 | sr_dev_attr = (struct omap_smartreflex_dev_attr *)oh->dev_attr; |
157 | if (!sr_dev_attr || !sr_dev_attr->sensor_voltdm_name) { |
158 | pr_err("%s: No voltage domain specified for %s. Cannot initialize\n" , |
159 | __func__, oh->name); |
160 | return 0; |
161 | } |
162 | |
163 | return sr_init_by_name(oh->name, sr_dev_attr->sensor_voltdm_name); |
164 | } |
165 | #else |
166 | static int __init sr_dev_init(struct omap_hwmod *oh, void *user) |
167 | { |
168 | return -EINVAL; |
169 | } |
170 | #endif |
171 | |
172 | static const char * const omap4_sr_instances[] = { |
173 | "mpu" , |
174 | "iva" , |
175 | "core" , |
176 | }; |
177 | |
178 | static const char * const dra7_sr_instances[] = { |
179 | "mpu" , |
180 | "core" , |
181 | }; |
182 | |
183 | int __init omap_devinit_smartreflex(void) |
184 | { |
185 | const char * const *sr_inst = NULL; |
186 | int i, nr_sr = 0; |
187 | |
188 | if (soc_is_omap44xx()) { |
189 | sr_inst = omap4_sr_instances; |
190 | nr_sr = ARRAY_SIZE(omap4_sr_instances); |
191 | |
192 | } else if (soc_is_dra7xx()) { |
193 | sr_inst = dra7_sr_instances; |
194 | nr_sr = ARRAY_SIZE(dra7_sr_instances); |
195 | } |
196 | |
197 | if (nr_sr) { |
198 | const char *name, *voltdm; |
199 | |
200 | for (i = 0; i < nr_sr; i++) { |
201 | name = kasprintf(GFP_KERNEL, fmt: "smartreflex_%s" , sr_inst[i]); |
202 | voltdm = sr_inst[i]; |
203 | sr_init_by_name(name, voltdm); |
204 | } |
205 | |
206 | return 0; |
207 | } |
208 | |
209 | return omap_hwmod_for_each_by_class(classname: "smartreflex" , fn: sr_dev_init, NULL); |
210 | } |
211 | |