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 static struct omap_device_pm_latency omap_sr_latency[] = { 35 { 36 .deactivate_func = omap_device_idle_hwmods, 37 .activate_func = omap_device_enable_hwmods, 38 .flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST 39 }, 40 }; 41 42 /* Read EFUSE values from control registers for OMAP3430 */ 43 static void __init sr_set_nvalues(struct omap_volt_data *volt_data, 44 struct omap_sr_data *sr_data) 45 { 46 struct omap_sr_nvalue_table *nvalue_table; 47 int i, count = 0; 48 49 while (volt_data[count].volt_nominal) 50 count++; 51 52 nvalue_table = kzalloc(sizeof(struct omap_sr_nvalue_table)*count, 53 GFP_KERNEL); 54 55 for (i = 0; i < count; i++) { 56 u32 v; 57 /* 58 * In OMAP4 the efuse registers are 24 bit aligned. 59 * A __raw_readl will fail for non-32 bit aligned address 60 * and hence the 8-bit read and shift. 61 */ 62 if (cpu_is_omap44xx()) { 63 u16 offset = volt_data[i].sr_efuse_offs; 64 65 v = omap_ctrl_readb(offset) | 66 omap_ctrl_readb(offset + 1) << 8 | 67 omap_ctrl_readb(offset + 2) << 16; 68 } else { 69 v = omap_ctrl_readl(volt_data[i].sr_efuse_offs); 70 } 71 72 nvalue_table[i].efuse_offs = volt_data[i].sr_efuse_offs; 73 nvalue_table[i].nvalue = v; 74 } 75 76 sr_data->nvalue_table = nvalue_table; 77 sr_data->nvalue_count = count; 78 } 79 80 static int sr_dev_init(struct omap_hwmod *oh, void *user) 81 { 82 struct omap_sr_data *sr_data; 83 struct omap_device *od; 84 struct omap_volt_data *volt_data; 85 char *name = "smartreflex"; 86 static int i; 87 88 sr_data = kzalloc(sizeof(struct omap_sr_data), GFP_KERNEL); 89 if (!sr_data) { 90 pr_err("%s: Unable to allocate memory for %s sr_data.Error!\n", 91 __func__, oh->name); 92 return -ENOMEM; 93 } 94 95 if (!oh->vdd_name) { 96 pr_err("%s: No voltage domain specified for %s." 97 "Cannot initialize\n", __func__, oh->name); 98 goto exit; 99 } 100 101 sr_data->ip_type = oh->class->rev; 102 sr_data->senn_mod = 0x1; 103 sr_data->senp_mod = 0x1; 104 105 sr_data->voltdm = omap_voltage_domain_lookup(oh->vdd_name); 106 if (IS_ERR(sr_data->voltdm)) { 107 pr_err("%s: Unable to get voltage domain pointer for VDD %s\n", 108 __func__, oh->vdd_name); 109 goto exit; 110 } 111 112 omap_voltage_get_volttable(sr_data->voltdm, &volt_data); 113 if (!volt_data) { 114 pr_warning("%s: No Voltage table registerd fo VDD%d." 115 "Something really wrong\n\n", __func__, i + 1); 116 goto exit; 117 } 118 119 sr_set_nvalues(volt_data, sr_data); 120 121 sr_data->enable_on_init = sr_enable_on_init; 122 123 od = omap_device_build(name, i, oh, sr_data, sizeof(*sr_data), 124 omap_sr_latency, 125 ARRAY_SIZE(omap_sr_latency), 0); 126 if (IS_ERR(od)) 127 pr_warning("%s: Could not build omap_device for %s: %s.\n\n", 128 __func__, name, oh->name); 129 exit: 130 i++; 131 kfree(sr_data); 132 return 0; 133 } 134 135 /* 136 * API to be called from board files to enable smartreflex 137 * autocompensation at init. 138 */ 139 void __init omap_enable_smartreflex_on_init(void) 140 { 141 sr_enable_on_init = true; 142 } 143 144 int __init omap_devinit_smartreflex(void) 145 { 146 return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL); 147 } 148