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 static int __init sr_dev_init(struct omap_hwmod *oh, void *user) 93 { 94 struct omap_sr_data *sr_data; 95 struct platform_device *pdev; 96 struct omap_volt_data *volt_data; 97 struct omap_smartreflex_dev_attr *sr_dev_attr; 98 char *name = "smartreflex"; 99 static int i; 100 101 sr_data = kzalloc(sizeof(*sr_data), GFP_KERNEL); 102 if (!sr_data) 103 return -ENOMEM; 104 105 sr_dev_attr = (struct omap_smartreflex_dev_attr *)oh->dev_attr; 106 if (!sr_dev_attr || !sr_dev_attr->sensor_voltdm_name) { 107 pr_err("%s: No voltage domain specified for %s. Cannot initialize\n", 108 __func__, oh->name); 109 goto exit; 110 } 111 112 sr_data->name = oh->name; 113 sr_data->ip_type = oh->class->rev; 114 sr_data->senn_mod = 0x1; 115 sr_data->senp_mod = 0x1; 116 117 if (cpu_is_omap34xx() || cpu_is_omap44xx()) { 118 sr_data->err_weight = OMAP3430_SR_ERRWEIGHT; 119 sr_data->err_maxlimit = OMAP3430_SR_ERRMAXLIMIT; 120 sr_data->accum_data = OMAP3430_SR_ACCUMDATA; 121 if (!(strcmp(sr_data->name, "smartreflex_mpu"))) { 122 sr_data->senn_avgweight = OMAP3430_SR1_SENNAVGWEIGHT; 123 sr_data->senp_avgweight = OMAP3430_SR1_SENPAVGWEIGHT; 124 } else { 125 sr_data->senn_avgweight = OMAP3430_SR2_SENNAVGWEIGHT; 126 sr_data->senp_avgweight = OMAP3430_SR2_SENPAVGWEIGHT; 127 } 128 } 129 130 sr_data->voltdm = voltdm_lookup(sr_dev_attr->sensor_voltdm_name); 131 if (!sr_data->voltdm) { 132 pr_err("%s: Unable to get voltage domain pointer for VDD %s\n", 133 __func__, sr_dev_attr->sensor_voltdm_name); 134 goto exit; 135 } 136 137 omap_voltage_get_volttable(sr_data->voltdm, &volt_data); 138 if (!volt_data) { 139 pr_err("%s: No Voltage table registered for VDD%d\n", 140 __func__, i + 1); 141 goto exit; 142 } 143 144 sr_set_nvalues(volt_data, sr_data); 145 146 sr_data->enable_on_init = sr_enable_on_init; 147 148 pdev = omap_device_build(name, i, oh, sr_data, sizeof(*sr_data)); 149 if (IS_ERR(pdev)) 150 pr_warn("%s: Could not build omap_device for %s: %s\n", 151 __func__, name, oh->name); 152 exit: 153 i++; 154 kfree(sr_data); 155 return 0; 156 } 157 158 /* 159 * API to be called from board files to enable smartreflex 160 * autocompensation at init. 161 */ 162 void __init omap_enable_smartreflex_on_init(void) 163 { 164 sr_enable_on_init = true; 165 } 166 167 int __init omap_devinit_smartreflex(void) 168 { 169 return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL); 170 } 171