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 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 char *name = "smartreflex"; 78 static int i; 79 80 sr_data = kzalloc(sizeof(struct omap_sr_data), GFP_KERNEL); 81 if (!sr_data) { 82 pr_err("%s: Unable to allocate memory for %s sr_data.Error!\n", 83 __func__, oh->name); 84 return -ENOMEM; 85 } 86 87 if (!oh->vdd_name) { 88 pr_err("%s: No voltage domain specified for %s." 89 "Cannot initialize\n", __func__, oh->name); 90 goto exit; 91 } 92 93 sr_data->ip_type = oh->class->rev; 94 sr_data->senn_mod = 0x1; 95 sr_data->senp_mod = 0x1; 96 97 sr_data->voltdm = voltdm_lookup(oh->vdd_name); 98 if (IS_ERR(sr_data->voltdm)) { 99 pr_err("%s: Unable to get voltage domain pointer for VDD %s\n", 100 __func__, oh->vdd_name); 101 goto exit; 102 } 103 104 omap_voltage_get_volttable(sr_data->voltdm, &volt_data); 105 if (!volt_data) { 106 pr_warning("%s: No Voltage table registerd fo VDD%d." 107 "Something really wrong\n\n", __func__, i + 1); 108 goto exit; 109 } 110 111 sr_set_nvalues(volt_data, sr_data); 112 113 sr_data->enable_on_init = sr_enable_on_init; 114 115 pdev = omap_device_build(name, i, oh, sr_data, sizeof(*sr_data), 116 NULL, 0, 0); 117 if (IS_ERR(pdev)) 118 pr_warning("%s: Could not build omap_device for %s: %s.\n\n", 119 __func__, name, oh->name); 120 exit: 121 i++; 122 kfree(sr_data); 123 return 0; 124 } 125 126 /* 127 * API to be called from board files to enable smartreflex 128 * autocompensation at init. 129 */ 130 void __init omap_enable_smartreflex_on_init(void) 131 { 132 sr_enable_on_init = true; 133 } 134 135 int __init omap_devinit_smartreflex(void) 136 { 137 return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL); 138 } 139