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 #include <linux/power/smartreflex.h> 21 22 #include <linux/err.h> 23 #include <linux/slab.h> 24 #include <linux/io.h> 25 26 #include "soc.h" 27 #include "omap_device.h" 28 #include "voltage.h" 29 #include "control.h" 30 #include "pm.h" 31 32 static bool sr_enable_on_init; 33 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; 39 int i, j, count = 0; 40 41 sr_data->nvalue_count = 0; 42 sr_data->nvalue_table = NULL; 43 44 while (volt_data[count].volt_nominal) 45 count++; 46 47 nvalue_table = kcalloc(count, sizeof(*nvalue_table), GFP_KERNEL); 48 if (!nvalue_table) 49 return; 50 51 for (i = 0, j = 0; i < count; i++) { 52 u32 v; 53 54 /* 55 * In OMAP4 the efuse registers are 24 bit aligned. 56 * A readl_relaxed will fail for non-32 bit aligned address 57 * and hence the 8-bit read and shift. 58 */ 59 if (cpu_is_omap44xx()) { 60 u16 offset = volt_data[i].sr_efuse_offs; 61 62 v = omap_ctrl_readb(offset) | 63 omap_ctrl_readb(offset + 1) << 8 | 64 omap_ctrl_readb(offset + 2) << 16; 65 } else { 66 v = omap_ctrl_readl(volt_data[i].sr_efuse_offs); 67 } 68 69 /* 70 * Many OMAP SoCs don't have the eFuse values set. 71 * For example, pretty much all OMAP3xxx before 72 * ES3.something. 73 * 74 * XXX There needs to be some way for board files or 75 * userspace to add these in. 76 */ 77 if (v == 0) 78 continue; 79 80 nvalue_table[j].nvalue = v; 81 nvalue_table[j].efuse_offs = volt_data[i].sr_efuse_offs; 82 nvalue_table[j].errminlimit = volt_data[i].sr_errminlimit; 83 nvalue_table[j].volt_nominal = volt_data[i].volt_nominal; 84 85 j++; 86 } 87 88 sr_data->nvalue_table = nvalue_table; 89 sr_data->nvalue_count = j; 90 } 91 92 extern struct omap_sr_data omap_sr_pdata[]; 93 94 static int __init sr_dev_init(struct omap_hwmod *oh, void *user) 95 { 96 struct omap_sr_data *sr_data = NULL; 97 struct omap_volt_data *volt_data; 98 struct omap_smartreflex_dev_attr *sr_dev_attr; 99 static int i; 100 101 if (!strncmp(oh->name, "smartreflex_mpu_iva", 20) || 102 !strncmp(oh->name, "smartreflex_mpu", 16)) 103 sr_data = &omap_sr_pdata[OMAP_SR_MPU]; 104 else if (!strncmp(oh->name, "smartreflex_core", 17)) 105 sr_data = &omap_sr_pdata[OMAP_SR_CORE]; 106 else if (!strncmp(oh->name, "smartreflex_iva", 16)) 107 sr_data = &omap_sr_pdata[OMAP_SR_IVA]; 108 109 if (!sr_data) { 110 pr_err("%s: Unknown instance %s\n", __func__, oh->name); 111 return -EINVAL; 112 } 113 114 sr_dev_attr = (struct omap_smartreflex_dev_attr *)oh->dev_attr; 115 if (!sr_dev_attr || !sr_dev_attr->sensor_voltdm_name) { 116 pr_err("%s: No voltage domain specified for %s. Cannot initialize\n", 117 __func__, oh->name); 118 goto exit; 119 } 120 121 sr_data->name = oh->name; 122 if (cpu_is_omap343x()) 123 sr_data->ip_type = 1; 124 else 125 sr_data->ip_type = 2; 126 sr_data->senn_mod = 0x1; 127 sr_data->senp_mod = 0x1; 128 129 if (cpu_is_omap34xx() || cpu_is_omap44xx()) { 130 sr_data->err_weight = OMAP3430_SR_ERRWEIGHT; 131 sr_data->err_maxlimit = OMAP3430_SR_ERRMAXLIMIT; 132 sr_data->accum_data = OMAP3430_SR_ACCUMDATA; 133 if (!(strcmp(sr_data->name, "smartreflex_mpu"))) { 134 sr_data->senn_avgweight = OMAP3430_SR1_SENNAVGWEIGHT; 135 sr_data->senp_avgweight = OMAP3430_SR1_SENPAVGWEIGHT; 136 } else { 137 sr_data->senn_avgweight = OMAP3430_SR2_SENNAVGWEIGHT; 138 sr_data->senp_avgweight = OMAP3430_SR2_SENPAVGWEIGHT; 139 } 140 } 141 142 sr_data->voltdm = voltdm_lookup(sr_dev_attr->sensor_voltdm_name); 143 if (!sr_data->voltdm) { 144 pr_err("%s: Unable to get voltage domain pointer for VDD %s\n", 145 __func__, sr_dev_attr->sensor_voltdm_name); 146 goto exit; 147 } 148 149 omap_voltage_get_volttable(sr_data->voltdm, &volt_data); 150 if (!volt_data) { 151 pr_err("%s: No Voltage table registered for VDD%d\n", 152 __func__, i + 1); 153 goto exit; 154 } 155 156 sr_set_nvalues(volt_data, sr_data); 157 158 sr_data->enable_on_init = sr_enable_on_init; 159 160 exit: 161 i++; 162 163 return 0; 164 } 165 166 /* 167 * API to be called from board files to enable smartreflex 168 * autocompensation at init. 169 */ 170 void __init omap_enable_smartreflex_on_init(void) 171 { 172 sr_enable_on_init = true; 173 } 174 175 int __init omap_devinit_smartreflex(void) 176 { 177 return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL); 178 } 179