1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Core driver access RC5T583 power management chip. 4 * 5 * Copyright (c) 2011-2012, NVIDIA CORPORATION. All rights reserved. 6 * Author: Laxman dewangan <ldewangan@nvidia.com> 7 * 8 * Based on code 9 * Copyright (C) 2011 RICOH COMPANY,LTD 10 */ 11 #include <linux/interrupt.h> 12 #include <linux/irq.h> 13 #include <linux/kernel.h> 14 #include <linux/init.h> 15 #include <linux/err.h> 16 #include <linux/slab.h> 17 #include <linux/i2c.h> 18 #include <linux/mfd/core.h> 19 #include <linux/mfd/rc5t583.h> 20 #include <linux/regmap.h> 21 22 #define RICOH_ONOFFSEL_REG 0x10 23 #define RICOH_SWCTL_REG 0x5E 24 25 struct deepsleep_control_data { 26 u8 reg_add; 27 u8 ds_pos_bit; 28 }; 29 30 #define DEEPSLEEP_INIT(_id, _reg, _pos) \ 31 { \ 32 .reg_add = RC5T583_##_reg, \ 33 .ds_pos_bit = _pos, \ 34 } 35 36 static struct deepsleep_control_data deepsleep_data[] = { 37 DEEPSLEEP_INIT(DC0, SLPSEQ1, 0), 38 DEEPSLEEP_INIT(DC1, SLPSEQ1, 4), 39 DEEPSLEEP_INIT(DC2, SLPSEQ2, 0), 40 DEEPSLEEP_INIT(DC3, SLPSEQ2, 4), 41 DEEPSLEEP_INIT(LDO0, SLPSEQ3, 0), 42 DEEPSLEEP_INIT(LDO1, SLPSEQ3, 4), 43 DEEPSLEEP_INIT(LDO2, SLPSEQ4, 0), 44 DEEPSLEEP_INIT(LDO3, SLPSEQ4, 4), 45 DEEPSLEEP_INIT(LDO4, SLPSEQ5, 0), 46 DEEPSLEEP_INIT(LDO5, SLPSEQ5, 4), 47 DEEPSLEEP_INIT(LDO6, SLPSEQ6, 0), 48 DEEPSLEEP_INIT(LDO7, SLPSEQ6, 4), 49 DEEPSLEEP_INIT(LDO8, SLPSEQ7, 0), 50 DEEPSLEEP_INIT(LDO9, SLPSEQ7, 4), 51 DEEPSLEEP_INIT(PSO0, SLPSEQ8, 0), 52 DEEPSLEEP_INIT(PSO1, SLPSEQ8, 4), 53 DEEPSLEEP_INIT(PSO2, SLPSEQ9, 0), 54 DEEPSLEEP_INIT(PSO3, SLPSEQ9, 4), 55 DEEPSLEEP_INIT(PSO4, SLPSEQ10, 0), 56 DEEPSLEEP_INIT(PSO5, SLPSEQ10, 4), 57 DEEPSLEEP_INIT(PSO6, SLPSEQ11, 0), 58 DEEPSLEEP_INIT(PSO7, SLPSEQ11, 4), 59 }; 60 61 #define EXT_PWR_REQ \ 62 (RC5T583_EXT_PWRREQ1_CONTROL | RC5T583_EXT_PWRREQ2_CONTROL) 63 64 static const struct mfd_cell rc5t583_subdevs[] = { 65 {.name = "rc5t583-gpio",}, 66 {.name = "rc5t583-regulator",}, 67 {.name = "rc5t583-rtc", }, 68 {.name = "rc5t583-key", } 69 }; 70 71 static int __rc5t583_set_ext_pwrreq1_control(struct device *dev, 72 int id, int ext_pwr, int slots) 73 { 74 int ret; 75 uint8_t sleepseq_val = 0; 76 unsigned int en_bit; 77 unsigned int slot_bit; 78 79 if (id == RC5T583_DS_DC0) { 80 dev_err(dev, "PWRREQ1 is invalid control for rail %d\n", id); 81 return -EINVAL; 82 } 83 84 en_bit = deepsleep_data[id].ds_pos_bit; 85 slot_bit = en_bit + 1; 86 ret = rc5t583_read(dev, deepsleep_data[id].reg_add, &sleepseq_val); 87 if (ret < 0) { 88 dev_err(dev, "Error in reading reg 0x%x\n", 89 deepsleep_data[id].reg_add); 90 return ret; 91 } 92 93 sleepseq_val &= ~(0xF << en_bit); 94 sleepseq_val |= BIT(en_bit); 95 sleepseq_val |= ((slots & 0x7) << slot_bit); 96 ret = rc5t583_set_bits(dev, RICOH_ONOFFSEL_REG, BIT(1)); 97 if (ret < 0) { 98 dev_err(dev, "Error in updating the 0x%02x register\n", 99 RICOH_ONOFFSEL_REG); 100 return ret; 101 } 102 103 ret = rc5t583_write(dev, deepsleep_data[id].reg_add, sleepseq_val); 104 if (ret < 0) { 105 dev_err(dev, "Error in writing reg 0x%x\n", 106 deepsleep_data[id].reg_add); 107 return ret; 108 } 109 110 if (id == RC5T583_DS_LDO4) { 111 ret = rc5t583_write(dev, RICOH_SWCTL_REG, 0x1); 112 if (ret < 0) 113 dev_err(dev, "Error in writing reg 0x%x\n", 114 RICOH_SWCTL_REG); 115 } 116 return ret; 117 } 118 119 static int __rc5t583_set_ext_pwrreq2_control(struct device *dev, 120 int id, int ext_pwr) 121 { 122 int ret; 123 124 if (id != RC5T583_DS_DC0) { 125 dev_err(dev, "PWRREQ2 is invalid control for rail %d\n", id); 126 return -EINVAL; 127 } 128 129 ret = rc5t583_set_bits(dev, RICOH_ONOFFSEL_REG, BIT(2)); 130 if (ret < 0) 131 dev_err(dev, "Error in updating the ONOFFSEL 0x10 register\n"); 132 return ret; 133 } 134 135 int rc5t583_ext_power_req_config(struct device *dev, int ds_id, 136 int ext_pwr_req, int deepsleep_slot_nr) 137 { 138 if ((ext_pwr_req & EXT_PWR_REQ) == EXT_PWR_REQ) 139 return -EINVAL; 140 141 if (ext_pwr_req & RC5T583_EXT_PWRREQ1_CONTROL) 142 return __rc5t583_set_ext_pwrreq1_control(dev, ds_id, 143 ext_pwr_req, deepsleep_slot_nr); 144 145 if (ext_pwr_req & RC5T583_EXT_PWRREQ2_CONTROL) 146 return __rc5t583_set_ext_pwrreq2_control(dev, 147 ds_id, ext_pwr_req); 148 return 0; 149 } 150 EXPORT_SYMBOL(rc5t583_ext_power_req_config); 151 152 static int rc5t583_clear_ext_power_req(struct rc5t583 *rc5t583, 153 struct rc5t583_platform_data *pdata) 154 { 155 int ret; 156 int i; 157 uint8_t on_off_val = 0; 158 159 /* Clear ONOFFSEL register */ 160 if (pdata->enable_shutdown) 161 on_off_val = 0x1; 162 163 ret = rc5t583_write(rc5t583->dev, RICOH_ONOFFSEL_REG, on_off_val); 164 if (ret < 0) 165 dev_warn(rc5t583->dev, "Error in writing reg %d error: %d\n", 166 RICOH_ONOFFSEL_REG, ret); 167 168 ret = rc5t583_write(rc5t583->dev, RICOH_SWCTL_REG, 0x0); 169 if (ret < 0) 170 dev_warn(rc5t583->dev, "Error in writing reg %d error: %d\n", 171 RICOH_SWCTL_REG, ret); 172 173 /* Clear sleep sequence register */ 174 for (i = RC5T583_SLPSEQ1; i <= RC5T583_SLPSEQ11; ++i) { 175 ret = rc5t583_write(rc5t583->dev, i, 0x0); 176 if (ret < 0) 177 dev_warn(rc5t583->dev, 178 "Error in writing reg 0x%02x error: %d\n", 179 i, ret); 180 } 181 return 0; 182 } 183 184 static bool volatile_reg(struct device *dev, unsigned int reg) 185 { 186 /* Enable caching in interrupt registers */ 187 switch (reg) { 188 case RC5T583_INT_EN_SYS1: 189 case RC5T583_INT_EN_SYS2: 190 case RC5T583_INT_EN_DCDC: 191 case RC5T583_INT_EN_RTC: 192 case RC5T583_INT_EN_ADC1: 193 case RC5T583_INT_EN_ADC2: 194 case RC5T583_INT_EN_ADC3: 195 case RC5T583_GPIO_GPEDGE1: 196 case RC5T583_GPIO_GPEDGE2: 197 case RC5T583_GPIO_EN_INT: 198 return false; 199 200 case RC5T583_GPIO_MON_IOIN: 201 /* This is gpio input register */ 202 return true; 203 204 default: 205 /* Enable caching in gpio registers */ 206 if ((reg >= RC5T583_GPIO_IOSEL) && 207 (reg <= RC5T583_GPIO_GPOFUNC)) 208 return false; 209 210 /* Enable caching in sleep seq registers */ 211 if ((reg >= RC5T583_SLPSEQ1) && (reg <= RC5T583_SLPSEQ11)) 212 return false; 213 214 /* Enable caching of regulator registers */ 215 if ((reg >= RC5T583_REG_DC0CTL) && (reg <= RC5T583_REG_SR3CTL)) 216 return false; 217 if ((reg >= RC5T583_REG_LDOEN1) && 218 (reg <= RC5T583_REG_LDO9DAC_DS)) 219 return false; 220 221 break; 222 } 223 224 return true; 225 } 226 227 static const struct regmap_config rc5t583_regmap_config = { 228 .reg_bits = 8, 229 .val_bits = 8, 230 .volatile_reg = volatile_reg, 231 .max_register = RC5T583_MAX_REG, 232 .num_reg_defaults_raw = RC5T583_NUM_REGS, 233 .cache_type = REGCACHE_RBTREE, 234 }; 235 236 static int rc5t583_i2c_probe(struct i2c_client *i2c, 237 const struct i2c_device_id *id) 238 { 239 struct rc5t583 *rc5t583; 240 struct rc5t583_platform_data *pdata = dev_get_platdata(&i2c->dev); 241 int ret; 242 243 if (!pdata) { 244 dev_err(&i2c->dev, "Err: Platform data not found\n"); 245 return -EINVAL; 246 } 247 248 rc5t583 = devm_kzalloc(&i2c->dev, sizeof(*rc5t583), GFP_KERNEL); 249 if (!rc5t583) 250 return -ENOMEM; 251 252 rc5t583->dev = &i2c->dev; 253 i2c_set_clientdata(i2c, rc5t583); 254 255 rc5t583->regmap = devm_regmap_init_i2c(i2c, &rc5t583_regmap_config); 256 if (IS_ERR(rc5t583->regmap)) { 257 ret = PTR_ERR(rc5t583->regmap); 258 dev_err(&i2c->dev, "regmap initialization failed: %d\n", ret); 259 return ret; 260 } 261 262 ret = rc5t583_clear_ext_power_req(rc5t583, pdata); 263 if (ret < 0) 264 return ret; 265 266 if (i2c->irq) { 267 ret = rc5t583_irq_init(rc5t583, i2c->irq, pdata->irq_base); 268 /* Still continue with warning, if irq init fails */ 269 if (ret) 270 dev_warn(&i2c->dev, "IRQ init failed: %d\n", ret); 271 } 272 273 ret = devm_mfd_add_devices(rc5t583->dev, -1, rc5t583_subdevs, 274 ARRAY_SIZE(rc5t583_subdevs), NULL, 0, NULL); 275 if (ret) { 276 dev_err(&i2c->dev, "add mfd devices failed: %d\n", ret); 277 return ret; 278 } 279 280 return 0; 281 } 282 283 static const struct i2c_device_id rc5t583_i2c_id[] = { 284 {.name = "rc5t583", .driver_data = 0}, 285 {} 286 }; 287 288 static struct i2c_driver rc5t583_i2c_driver = { 289 .driver = { 290 .name = "rc5t583", 291 }, 292 .probe = rc5t583_i2c_probe, 293 .id_table = rc5t583_i2c_id, 294 }; 295 296 static int __init rc5t583_i2c_init(void) 297 { 298 return i2c_add_driver(&rc5t583_i2c_driver); 299 } 300 subsys_initcall(rc5t583_i2c_init); 301