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 <plat/omap_device.h> 27 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 = kzalloc(sizeof(struct omap_sr_nvalue_table)*count, 48 GFP_KERNEL); 49 50 if (!nvalue_table) { 51 pr_err("OMAP: SmartReflex: cannot allocate memory for n-value table\n"); 52 return; 53 } 54 55 for (i = 0, j = 0; i < count; i++) { 56 u32 v; 57 58 /* 59 * In OMAP4 the efuse registers are 24 bit aligned. 60 * A __raw_readl will fail for non-32 bit aligned address 61 * and hence the 8-bit read and shift. 62 */ 63 if (cpu_is_omap44xx()) { 64 u16 offset = volt_data[i].sr_efuse_offs; 65 66 v = omap_ctrl_readb(offset) | 67 omap_ctrl_readb(offset + 1) << 8 | 68 omap_ctrl_readb(offset + 2) << 16; 69 } else { 70 v = omap_ctrl_readl(volt_data[i].sr_efuse_offs); 71 } 72 73 /* 74 * Many OMAP SoCs don't have the eFuse values set. 75 * For example, pretty much all OMAP3xxx before 76 * ES3.something. 77 * 78 * XXX There needs to be some way for board files or 79 * userspace to add these in. 80 */ 81 if (v == 0) 82 continue; 83 84 nvalue_table[j].nvalue = v; 85 nvalue_table[j].efuse_offs = volt_data[i].sr_efuse_offs; 86 nvalue_table[j].errminlimit = volt_data[i].sr_errminlimit; 87 nvalue_table[j].volt_nominal = volt_data[i].volt_nominal; 88 89 j++; 90 } 91 92 sr_data->nvalue_table = nvalue_table; 93 sr_data->nvalue_count = j; 94 } 95 96 static int __init sr_dev_init(struct omap_hwmod *oh, void *user) 97 { 98 struct omap_sr_data *sr_data; 99 struct platform_device *pdev; 100 struct omap_volt_data *volt_data; 101 struct omap_smartreflex_dev_attr *sr_dev_attr; 102 char *name = "smartreflex"; 103 static int i; 104 105 sr_data = kzalloc(sizeof(struct omap_sr_data), GFP_KERNEL); 106 if (!sr_data) { 107 pr_err("%s: Unable to allocate memory for %s sr_data\n", 108 __func__, oh->name); 109 return -ENOMEM; 110 } 111 112 sr_dev_attr = (struct omap_smartreflex_dev_attr *)oh->dev_attr; 113 if (!sr_dev_attr || !sr_dev_attr->sensor_voltdm_name) { 114 pr_err("%s: No voltage domain specified for %s. Cannot initialize\n", 115 __func__, oh->name); 116 goto exit; 117 } 118 119 sr_data->name = oh->name; 120 sr_data->ip_type = oh->class->rev; 121 sr_data->senn_mod = 0x1; 122 sr_data->senp_mod = 0x1; 123 124 sr_data->voltdm = voltdm_lookup(sr_dev_attr->sensor_voltdm_name); 125 if (IS_ERR(sr_data->voltdm)) { 126 pr_err("%s: Unable to get voltage domain pointer for VDD %s\n", 127 __func__, sr_dev_attr->sensor_voltdm_name); 128 goto exit; 129 } 130 131 omap_voltage_get_volttable(sr_data->voltdm, &volt_data); 132 if (!volt_data) { 133 pr_err("%s: No Voltage table registered for VDD%d\n", 134 __func__, i + 1); 135 goto exit; 136 } 137 138 sr_set_nvalues(volt_data, sr_data); 139 140 sr_data->enable_on_init = sr_enable_on_init; 141 142 pdev = omap_device_build(name, i, oh, sr_data, sizeof(*sr_data), 143 NULL, 0, 0); 144 if (IS_ERR(pdev)) 145 pr_warning("%s: Could not build omap_device for %s: %s.\n\n", 146 __func__, name, oh->name); 147 exit: 148 i++; 149 kfree(sr_data); 150 return 0; 151 } 152 153 /* 154 * API to be called from board files to enable smartreflex 155 * autocompensation at init. 156 */ 157 void __init omap_enable_smartreflex_on_init(void) 158 { 159 sr_enable_on_init = true; 160 } 161 162 int __init omap_devinit_smartreflex(void) 163 { 164 return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL); 165 } 166