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 21 #include <linux/err.h> 22 #include <linux/slab.h> 23 #include <linux/io.h> 24 25 #include <plat/omap_device.h> 26 27 #include "smartreflex.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, count = 0; 40 41 while (volt_data[count].volt_nominal) 42 count++; 43 44 nvalue_table = kzalloc(sizeof(struct omap_sr_nvalue_table)*count, 45 GFP_KERNEL); 46 47 for (i = 0; i < count; i++) { 48 u32 v; 49 /* 50 * In OMAP4 the efuse registers are 24 bit aligned. 51 * A __raw_readl 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 nvalue_table[i].efuse_offs = volt_data[i].sr_efuse_offs; 65 nvalue_table[i].nvalue = v; 66 } 67 68 sr_data->nvalue_table = nvalue_table; 69 sr_data->nvalue_count = count; 70 } 71 72 static int __init sr_dev_init(struct omap_hwmod *oh, void *user) 73 { 74 struct omap_sr_data *sr_data; 75 struct platform_device *pdev; 76 struct omap_volt_data *volt_data; 77 struct omap_smartreflex_dev_attr *sr_dev_attr; 78 char *name = "smartreflex"; 79 static int i; 80 81 sr_data = kzalloc(sizeof(struct omap_sr_data), GFP_KERNEL); 82 if (!sr_data) { 83 pr_err("%s: Unable to allocate memory for %s sr_data.Error!\n", 84 __func__, oh->name); 85 return -ENOMEM; 86 } 87 88 sr_dev_attr = (struct omap_smartreflex_dev_attr *)oh->dev_attr; 89 if (!sr_dev_attr || !sr_dev_attr->sensor_voltdm_name) { 90 pr_err("%s: No voltage domain specified for %s." 91 "Cannot initialize\n", __func__, 92 oh->name); 93 goto exit; 94 } 95 96 sr_data->ip_type = oh->class->rev; 97 sr_data->senn_mod = 0x1; 98 sr_data->senp_mod = 0x1; 99 100 sr_data->voltdm = voltdm_lookup(sr_dev_attr->sensor_voltdm_name); 101 if (IS_ERR(sr_data->voltdm)) { 102 pr_err("%s: Unable to get voltage domain pointer for VDD %s\n", 103 __func__, sr_dev_attr->sensor_voltdm_name); 104 goto exit; 105 } 106 107 omap_voltage_get_volttable(sr_data->voltdm, &volt_data); 108 if (!volt_data) { 109 pr_warning("%s: No Voltage table registerd fo VDD%d." 110 "Something really wrong\n\n", __func__, i + 1); 111 goto exit; 112 } 113 114 sr_set_nvalues(volt_data, sr_data); 115 116 sr_data->enable_on_init = sr_enable_on_init; 117 118 pdev = omap_device_build(name, i, oh, sr_data, sizeof(*sr_data), 119 NULL, 0, 0); 120 if (IS_ERR(pdev)) 121 pr_warning("%s: Could not build omap_device for %s: %s.\n\n", 122 __func__, name, oh->name); 123 exit: 124 i++; 125 kfree(sr_data); 126 return 0; 127 } 128 129 /* 130 * API to be called from board files to enable smartreflex 131 * autocompensation at init. 132 */ 133 void __init omap_enable_smartreflex_on_init(void) 134 { 135 sr_enable_on_init = true; 136 } 137 138 int __init omap_devinit_smartreflex(void) 139 { 140 return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL); 141 } 142