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 static bool sr_enable_on_init;
30 
31 /* Read EFUSE values from control registers for OMAP3430 */
sr_set_nvalues(struct omap_volt_data * volt_data,struct omap_sr_data * sr_data)32 static void __init sr_set_nvalues(struct omap_volt_data *volt_data,
33 				struct omap_sr_data *sr_data)
34 {
35 	struct omap_sr_nvalue_table *nvalue_table;
36 	int i, j, count = 0;
37 
38 	sr_data->nvalue_count = 0;
39 	sr_data->nvalue_table = NULL;
40 
41 	while (volt_data[count].volt_nominal)
42 		count++;
43 
44 	nvalue_table = kcalloc(count, sizeof(*nvalue_table), GFP_KERNEL);
45 	if (!nvalue_table)
46 		return;
47 
48 	for (i = 0, j = 0; i < count; i++) {
49 		u32 v;
50 
51 		/*
52 		 * In OMAP4 the efuse registers are 24 bit aligned.
53 		 * A readl_relaxed will fail for non-32 bit aligned address
54 		 * and hence the 8-bit read and shift.
55 		 */
56 		if (cpu_is_omap44xx()) {
57 			u16 offset = volt_data[i].sr_efuse_offs;
58 
59 			v = omap_ctrl_readb(offset) |
60 				omap_ctrl_readb(offset + 1) << 8 |
61 				omap_ctrl_readb(offset + 2) << 16;
62 		} else {
63 			v = omap_ctrl_readl(volt_data[i].sr_efuse_offs);
64 		}
65 
66 		/*
67 		 * Many OMAP SoCs don't have the eFuse values set.
68 		 * For example, pretty much all OMAP3xxx before
69 		 * ES3.something.
70 		 *
71 		 * XXX There needs to be some way for board files or
72 		 * userspace to add these in.
73 		 */
74 		if (v == 0)
75 			continue;
76 
77 		nvalue_table[j].nvalue = v;
78 		nvalue_table[j].efuse_offs = volt_data[i].sr_efuse_offs;
79 		nvalue_table[j].errminlimit = volt_data[i].sr_errminlimit;
80 		nvalue_table[j].volt_nominal = volt_data[i].volt_nominal;
81 
82 		j++;
83 	}
84 
85 	sr_data->nvalue_table = nvalue_table;
86 	sr_data->nvalue_count = j;
87 }
88 
89 extern struct omap_sr_data omap_sr_pdata[];
90 
sr_init_by_name(const char * name,const char * voltdm)91 static int __init sr_init_by_name(const char *name, const char *voltdm)
92 {
93 	struct omap_sr_data *sr_data = NULL;
94 	struct omap_volt_data *volt_data;
95 	static int i;
96 
97 	if (!strncmp(name, "smartreflex_mpu_iva", 20) ||
98 	    !strncmp(name, "smartreflex_mpu", 16))
99 		sr_data = &omap_sr_pdata[OMAP_SR_MPU];
100 	else if (!strncmp(name, "smartreflex_core", 17))
101 		sr_data = &omap_sr_pdata[OMAP_SR_CORE];
102 	else if (!strncmp(name, "smartreflex_iva", 16))
103 		sr_data = &omap_sr_pdata[OMAP_SR_IVA];
104 
105 	if (!sr_data) {
106 		pr_err("%s: Unknown instance %s\n", __func__, name);
107 		return -EINVAL;
108 	}
109 
110 	sr_data->name = name;
111 	if (cpu_is_omap343x())
112 		sr_data->ip_type = 1;
113 	else
114 		sr_data->ip_type = 2;
115 	sr_data->senn_mod = 0x1;
116 	sr_data->senp_mod = 0x1;
117 
118 	if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
119 		sr_data->err_weight = OMAP3430_SR_ERRWEIGHT;
120 		sr_data->err_maxlimit = OMAP3430_SR_ERRMAXLIMIT;
121 		sr_data->accum_data = OMAP3430_SR_ACCUMDATA;
122 		if (!(strcmp(sr_data->name, "smartreflex_mpu"))) {
123 			sr_data->senn_avgweight = OMAP3430_SR1_SENNAVGWEIGHT;
124 			sr_data->senp_avgweight = OMAP3430_SR1_SENPAVGWEIGHT;
125 		} else {
126 			sr_data->senn_avgweight = OMAP3430_SR2_SENNAVGWEIGHT;
127 			sr_data->senp_avgweight = OMAP3430_SR2_SENPAVGWEIGHT;
128 		}
129 	}
130 
131 	sr_data->voltdm = voltdm_lookup(voltdm);
132 	if (!sr_data->voltdm) {
133 		pr_err("%s: Unable to get voltage domain pointer for VDD %s\n",
134 			__func__, voltdm);
135 		goto exit;
136 	}
137 
138 	omap_voltage_get_volttable(sr_data->voltdm, &volt_data);
139 	if (!volt_data) {
140 		pr_err("%s: No Voltage table registered for VDD%d\n",
141 		       __func__, i + 1);
142 		goto exit;
143 	}
144 
145 	sr_set_nvalues(volt_data, sr_data);
146 
147 	sr_data->enable_on_init = sr_enable_on_init;
148 
149 exit:
150 	i++;
151 
152 	return 0;
153 }
154 
155 #ifdef CONFIG_OMAP_HWMOD
sr_dev_init(struct omap_hwmod * oh,void * user)156 static int __init sr_dev_init(struct omap_hwmod *oh, void *user)
157 {
158 	struct omap_smartreflex_dev_attr *sr_dev_attr;
159 
160 	sr_dev_attr = (struct omap_smartreflex_dev_attr *)oh->dev_attr;
161 	if (!sr_dev_attr || !sr_dev_attr->sensor_voltdm_name) {
162 		pr_err("%s: No voltage domain specified for %s. Cannot initialize\n",
163 		       __func__, oh->name);
164 		return 0;
165 	}
166 
167 	return sr_init_by_name(oh->name, sr_dev_attr->sensor_voltdm_name);
168 }
169 #else
sr_dev_init(struct omap_hwmod * oh,void * user)170 static int __init sr_dev_init(struct omap_hwmod *oh, void *user)
171 {
172 	return -EINVAL;
173 }
174 #endif
175 
176 /*
177  * API to be called from board files to enable smartreflex
178  * autocompensation at init.
179  */
omap_enable_smartreflex_on_init(void)180 void __init omap_enable_smartreflex_on_init(void)
181 {
182 	sr_enable_on_init = true;
183 }
184 
185 static const char * const omap4_sr_instances[] = {
186 	"mpu",
187 	"iva",
188 	"core",
189 };
190 
191 static const char * const dra7_sr_instances[] = {
192 	"mpu",
193 	"core",
194 };
195 
omap_devinit_smartreflex(void)196 int __init omap_devinit_smartreflex(void)
197 {
198 	const char * const *sr_inst = NULL;
199 	int i, nr_sr = 0;
200 
201 	if (soc_is_omap44xx()) {
202 		sr_inst = omap4_sr_instances;
203 		nr_sr = ARRAY_SIZE(omap4_sr_instances);
204 
205 	} else if (soc_is_dra7xx()) {
206 		sr_inst = dra7_sr_instances;
207 		nr_sr = ARRAY_SIZE(dra7_sr_instances);
208 	}
209 
210 	if (nr_sr) {
211 		const char *name, *voltdm;
212 
213 		for (i = 0; i < nr_sr; i++) {
214 			name = kasprintf(GFP_KERNEL, "smartreflex_%s", sr_inst[i]);
215 			voltdm = sr_inst[i];
216 			sr_init_by_name(name, voltdm);
217 		}
218 
219 		return 0;
220 	}
221 
222 	return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL);
223 }
224