1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * OMAP3/OMAP4 smartreflex device file 4 * 5 * Author: Thara Gopinath <thara@ti.com> 6 * 7 * Based originally on code from smartreflex.c 8 * Copyright (C) 2010 Texas Instruments, Inc. 9 * Thara Gopinath <thara@ti.com> 10 * 11 * Copyright (C) 2008 Nokia Corporation 12 * Kalle Jokiniemi 13 * 14 * Copyright (C) 2007 Texas Instruments, Inc. 15 * Lesly A M <x0080970@ti.com> 16 */ 17 #include <linux/power/smartreflex.h> 18 19 #include <linux/err.h> 20 #include <linux/slab.h> 21 #include <linux/io.h> 22 23 #include "soc.h" 24 #include "omap_device.h" 25 #include "voltage.h" 26 #include "control.h" 27 #include "pm.h" 28 29 static bool sr_enable_on_init; 30 31 /* Read EFUSE values from control registers for OMAP3430 */ 32 static void __init sr_set_nvalues(struct omap_volt_data *volt_data, 33 struct omap_sr_data *sr_data) 34 { 35 struct omap_sr_nvalue_table *nvalue_table; 36 int i, j, count = 0; 37 38 sr_data->nvalue_count = 0; 39 sr_data->nvalue_table = NULL; 40 41 while (volt_data[count].volt_nominal) 42 count++; 43 44 nvalue_table = kcalloc(count, sizeof(*nvalue_table), GFP_KERNEL); 45 if (!nvalue_table) 46 return; 47 48 for (i = 0, j = 0; i < count; i++) { 49 u32 v; 50 51 /* 52 * In OMAP4 the efuse registers are 24 bit aligned. 53 * A readl_relaxed will fail for non-32 bit aligned address 54 * and hence the 8-bit read and shift. 55 */ 56 if (cpu_is_omap44xx()) { 57 u16 offset = volt_data[i].sr_efuse_offs; 58 59 v = omap_ctrl_readb(offset) | 60 omap_ctrl_readb(offset + 1) << 8 | 61 omap_ctrl_readb(offset + 2) << 16; 62 } else { 63 v = omap_ctrl_readl(volt_data[i].sr_efuse_offs); 64 } 65 66 /* 67 * Many OMAP SoCs don't have the eFuse values set. 68 * For example, pretty much all OMAP3xxx before 69 * ES3.something. 70 * 71 * XXX There needs to be some way for board files or 72 * userspace to add these in. 73 */ 74 if (v == 0) 75 continue; 76 77 nvalue_table[j].nvalue = v; 78 nvalue_table[j].efuse_offs = volt_data[i].sr_efuse_offs; 79 nvalue_table[j].errminlimit = volt_data[i].sr_errminlimit; 80 nvalue_table[j].volt_nominal = volt_data[i].volt_nominal; 81 82 j++; 83 } 84 85 sr_data->nvalue_table = nvalue_table; 86 sr_data->nvalue_count = j; 87 } 88 89 extern struct omap_sr_data omap_sr_pdata[]; 90 91 static int __init sr_dev_init(struct omap_hwmod *oh, void *user) 92 { 93 struct omap_sr_data *sr_data = NULL; 94 struct omap_volt_data *volt_data; 95 struct omap_smartreflex_dev_attr *sr_dev_attr; 96 static int i; 97 98 if (!strncmp(oh->name, "smartreflex_mpu_iva", 20) || 99 !strncmp(oh->name, "smartreflex_mpu", 16)) 100 sr_data = &omap_sr_pdata[OMAP_SR_MPU]; 101 else if (!strncmp(oh->name, "smartreflex_core", 17)) 102 sr_data = &omap_sr_pdata[OMAP_SR_CORE]; 103 else if (!strncmp(oh->name, "smartreflex_iva", 16)) 104 sr_data = &omap_sr_pdata[OMAP_SR_IVA]; 105 106 if (!sr_data) { 107 pr_err("%s: Unknown instance %s\n", __func__, oh->name); 108 return -EINVAL; 109 } 110 111 sr_dev_attr = (struct omap_smartreflex_dev_attr *)oh->dev_attr; 112 if (!sr_dev_attr || !sr_dev_attr->sensor_voltdm_name) { 113 pr_err("%s: No voltage domain specified for %s. Cannot initialize\n", 114 __func__, oh->name); 115 goto exit; 116 } 117 118 sr_data->name = oh->name; 119 if (cpu_is_omap343x()) 120 sr_data->ip_type = 1; 121 else 122 sr_data->ip_type = 2; 123 sr_data->senn_mod = 0x1; 124 sr_data->senp_mod = 0x1; 125 126 if (cpu_is_omap34xx() || cpu_is_omap44xx()) { 127 sr_data->err_weight = OMAP3430_SR_ERRWEIGHT; 128 sr_data->err_maxlimit = OMAP3430_SR_ERRMAXLIMIT; 129 sr_data->accum_data = OMAP3430_SR_ACCUMDATA; 130 if (!(strcmp(sr_data->name, "smartreflex_mpu"))) { 131 sr_data->senn_avgweight = OMAP3430_SR1_SENNAVGWEIGHT; 132 sr_data->senp_avgweight = OMAP3430_SR1_SENPAVGWEIGHT; 133 } else { 134 sr_data->senn_avgweight = OMAP3430_SR2_SENNAVGWEIGHT; 135 sr_data->senp_avgweight = OMAP3430_SR2_SENPAVGWEIGHT; 136 } 137 } 138 139 sr_data->voltdm = voltdm_lookup(sr_dev_attr->sensor_voltdm_name); 140 if (!sr_data->voltdm) { 141 pr_err("%s: Unable to get voltage domain pointer for VDD %s\n", 142 __func__, sr_dev_attr->sensor_voltdm_name); 143 goto exit; 144 } 145 146 omap_voltage_get_volttable(sr_data->voltdm, &volt_data); 147 if (!volt_data) { 148 pr_err("%s: No Voltage table registered for VDD%d\n", 149 __func__, i + 1); 150 goto exit; 151 } 152 153 sr_set_nvalues(volt_data, sr_data); 154 155 sr_data->enable_on_init = sr_enable_on_init; 156 157 exit: 158 i++; 159 160 return 0; 161 } 162 163 /* 164 * API to be called from board files to enable smartreflex 165 * autocompensation at init. 166 */ 167 void __init omap_enable_smartreflex_on_init(void) 168 { 169 sr_enable_on_init = true; 170 } 171 172 int __init omap_devinit_smartreflex(void) 173 { 174 return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL); 175 } 176