kernel/drivers/mfd/rk808.c

   1 /*
   2  * MFD core driver for Rockchip RK808
   3  *
   4  * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
   5  *
   6  * Author: Chris Zhong <zyw@rock-chips.com>
   7  * Author: Zhang Qing <zhangqing@rock-chips.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms and conditions of the GNU General Public License,
  11  * version 2, as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope it will be useful, but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  16  * more details.
  17  */
  18
  19 #include <linux/i2c.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/mfd/rk808.h>
  22 #include <linux/mfd/core.h>
  23 #include <linux/module.h>
  24 #include <linux/regmap.h>
  25
  26 struct rk808_reg_data {
  27         int addr;
  28         int mask;
  29         int value;
  30 };
  31
  32 static bool rk808_is_volatile_reg(struct device *dev, unsigned int reg)
  33 {
  34         /*
  35          * Notes:
  36          * - Technically the ROUND_30s bit makes RTC_CTRL_REG volatile, but
  37          *   we don't use that feature.  It's better to cache.
  38          * - It's unlikely we care that RK808_DEVCTRL_REG is volatile since
  39          *   bits are cleared in case when we shutoff anyway, but better safe.
  40          */
  41
  42         switch (reg) {
  43         case RK808_SECONDS_REG ... RK808_WEEKS_REG:
  44         case RK808_RTC_STATUS_REG:
  45         case RK808_VB_MON_REG:
  46         case RK808_THERMAL_REG:
  47         case RK808_DCDC_UV_STS_REG:
  48         case RK808_LDO_UV_STS_REG:
  49         case RK808_DCDC_PG_REG:
  50         case RK808_LDO_PG_REG:
  51         case RK808_DEVCTRL_REG:
  52         case RK808_INT_STS_REG1:
  53         case RK808_INT_STS_REG2:
  54                 return true;
  55         }
  56
  57         return false;
  58 }
  59
  60 static const struct regmap_config rk808_regmap_config = {
  61         .reg_bits = 8,
  62         .val_bits = 8,
  63         .max_register = RK808_IO_POL_REG,
  64         .cache_type = REGCACHE_RBTREE,
  65         .volatile_reg = rk808_is_volatile_reg,
  66 };
  67
  68 static struct resource rtc_resources[] = {
  69         {
  70                 .start  = RK808_IRQ_RTC_ALARM,
  71                 .end    = RK808_IRQ_RTC_ALARM,
  72                 .flags  = IORESOURCE_IRQ,
  73         }
  74 };
  75
  76 static const struct mfd_cell rk808s[] = {
  77         { .name = "rk808-clkout", },
  78         { .name = "rk808-regulator", },
  79         {
  80                 .name = "rk808-rtc",
  81                 .num_resources = ARRAY_SIZE(rtc_resources),
  82                 .resources = &rtc_resources[0],
  83         },
  84 };
  85
  86 static const struct rk808_reg_data pre_init_reg[] = {
  87         { RK808_BUCK3_CONFIG_REG, BUCK_ILMIN_MASK,  BUCK_ILMIN_150MA },
  88         { RK808_BUCK4_CONFIG_REG, BUCK_ILMIN_MASK,  BUCK_ILMIN_200MA },
  89         { RK808_BOOST_CONFIG_REG, BOOST_ILMIN_MASK, BOOST_ILMIN_100MA },
  90         { RK808_BUCK1_CONFIG_REG, BUCK1_RATE_MASK,  BUCK_ILMIN_200MA },
  91         { RK808_BUCK2_CONFIG_REG, BUCK2_RATE_MASK,  BUCK_ILMIN_200MA },
  92         { RK808_DCDC_UV_ACT_REG,  BUCK_UV_ACT_MASK, BUCK_UV_ACT_DISABLE},
  93         { RK808_VB_MON_REG,       MASK_ALL,         VB_LO_ACT |
  94                                                     VB_LO_SEL_3500MV },
  95 };
  96
  97 static const struct regmap_irq rk808_irqs[] = {
  98         /* INT_STS */
  99         [RK808_IRQ_VOUT_LO] = {
 100                 .mask = RK808_IRQ_VOUT_LO_MSK,
 101                 .reg_offset = 0,
 102         },
 103         [RK808_IRQ_VB_LO] = {
 104                 .mask = RK808_IRQ_VB_LO_MSK,
 105                 .reg_offset = 0,
 106         },
 107         [RK808_IRQ_PWRON] = {
 108                 .mask = RK808_IRQ_PWRON_MSK,
 109                 .reg_offset = 0,
 110         },
 111         [RK808_IRQ_PWRON_LP] = {
 112                 .mask = RK808_IRQ_PWRON_LP_MSK,
 113                 .reg_offset = 0,
 114         },
 115         [RK808_IRQ_HOTDIE] = {
 116                 .mask = RK808_IRQ_HOTDIE_MSK,
 117                 .reg_offset = 0,
 118         },
 119         [RK808_IRQ_RTC_ALARM] = {
 120                 .mask = RK808_IRQ_RTC_ALARM_MSK,
 121                 .reg_offset = 0,
 122         },
 123         [RK808_IRQ_RTC_PERIOD] = {
 124                 .mask = RK808_IRQ_RTC_PERIOD_MSK,
 125                 .reg_offset = 0,
 126         },
 127
 128         /* INT_STS2 */
 129         [RK808_IRQ_PLUG_IN_INT] = {
 130                 .mask = RK808_IRQ_PLUG_IN_INT_MSK,
 131                 .reg_offset = 1,
 132         },
 133         [RK808_IRQ_PLUG_OUT_INT] = {
 134                 .mask = RK808_IRQ_PLUG_OUT_INT_MSK,
 135                 .reg_offset = 1,
 136         },
 137 };
 138
 139 static struct regmap_irq_chip rk808_irq_chip = {
 140         .name = "rk808",
 141         .irqs = rk808_irqs,
 142         .num_irqs = ARRAY_SIZE(rk808_irqs),
 143         .num_regs = 2,
 144         .irq_reg_stride = 2,
 145         .status_base = RK808_INT_STS_REG1,
 146         .mask_base = RK808_INT_STS_MSK_REG1,
 147         .ack_base = RK808_INT_STS_REG1,
 148         .init_ack_masked = true,
 149 };
 150
 151 static struct i2c_client *rk808_i2c_client;
 152 static void rk808_device_shutdown(void)
 153 {
 154         int ret;
 155         struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
 156
 157         if (!rk808) {
 158                 dev_warn(&rk808_i2c_client->dev,
 159                          "have no rk808, so do nothing here\n");
 160                 return;
 161         }
 162
 163         ret = regmap_update_bits(rk808->regmap,
 164                                  RK808_DEVCTRL_REG,
 165                                  DEV_OFF_RST, DEV_OFF_RST);
 166         if (ret)
 167                 dev_err(&rk808_i2c_client->dev, "power off error!\n");
 168 }
 169
 170 static int rk808_probe(struct i2c_client *client,
 171                        const struct i2c_device_id *id)
 172 {
 173         struct device_node *np = client->dev.of_node;
 174         struct rk808 *rk808;
 175         int pm_off = 0;
 176         int ret;
 177         int i;
 178
 179         if (!client->irq) {
 180                 dev_err(&client->dev, "No interrupt support, no core IRQ\n");
 181                 return -EINVAL;
 182         }
 183
 184         rk808 = devm_kzalloc(&client->dev, sizeof(*rk808), GFP_KERNEL);
 185         if (!rk808)
 186                 return -ENOMEM;
 187
 188         rk808->regmap = devm_regmap_init_i2c(client, &rk808_regmap_config);
 189         if (IS_ERR(rk808->regmap)) {
 190                 dev_err(&client->dev, "regmap initialization failed\n");
 191                 return PTR_ERR(rk808->regmap);
 192         }
 193
 194         for (i = 0; i < ARRAY_SIZE(pre_init_reg); i++) {
 195                 ret = regmap_update_bits(rk808->regmap, pre_init_reg[i].addr,
 196                                          pre_init_reg[i].mask,
 197                                          pre_init_reg[i].value);
 198                 if (ret) {
 199                         dev_err(&client->dev,
 200                                 "0x%x write err\n", pre_init_reg[i].addr);
 201                         return ret;
 202                 }
 203         }
 204
 205         ret = regmap_add_irq_chip(rk808->regmap, client->irq,
 206                                   IRQF_ONESHOT, -1,
 207                                   &rk808_irq_chip, &rk808->irq_data);
 208         if (ret) {
 209                 dev_err(&client->dev, "Failed to add irq_chip %d\n", ret);
 210                 return ret;
 211         }
 212
 213         rk808->i2c = client;
 214         i2c_set_clientdata(client, rk808);
 215
 216         ret = mfd_add_devices(&client->dev, -1,
 217                               rk808s, ARRAY_SIZE(rk808s),
 218                               NULL, 0, regmap_irq_get_domain(rk808->irq_data));
 219         if (ret) {
 220                 dev_err(&client->dev, "failed to add MFD devices %d\n", ret);
 221                 goto err_irq;
 222         }
 223
 224         pm_off = of_property_read_bool(np,
 225                                 "rockchip,system-power-controller");
 226         if (pm_off && !pm_power_off) {
 227                 rk808_i2c_client = client;
 228                 pm_power_off = rk808_device_shutdown;
 229         }
 230
 231         return 0;
 232
 233 err_irq:
 234         regmap_del_irq_chip(client->irq, rk808->irq_data);
 235         return ret;
 236 }
 237
 238 static int rk808_remove(struct i2c_client *client)
 239 {
 240         struct rk808 *rk808 = i2c_get_clientdata(client);
 241
 242         regmap_del_irq_chip(client->irq, rk808->irq_data);
 243         mfd_remove_devices(&client->dev);
 244         pm_power_off = NULL;
 245
 246         return 0;
 247 }
 248
 249 static const struct of_device_id rk808_of_match[] = {
 250         { .compatible = "rockchip,rk808" },
 251         { },
 252 };
 253 MODULE_DEVICE_TABLE(of, rk808_of_match);
 254
 255 static const struct i2c_device_id rk808_ids[] = {
 256         { "rk808" },
 257         { },
 258 };
 259 MODULE_DEVICE_TABLE(i2c, rk808_ids);
 260
 261 static struct i2c_driver rk808_i2c_driver = {
 262         .driver = {
 263                 .name = "rk808",
 264                 .of_match_table = rk808_of_match,
 265         },
 266         .probe    = rk808_probe,
 267         .remove   = rk808_remove,
 268         .id_table = rk808_ids,
 269 };
 270
 271 module_i2c_driver(rk808_i2c_driver);
 272
 273 MODULE_LICENSE("GPL");
 274 MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
 275 MODULE_AUTHOR("Zhang Qing <zhangqing@rock-chips.com>");
 276 MODULE_DESCRIPTION("RK808 PMIC driver");