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
rk808_is_volatile_reg(struct device * dev,unsigned int reg)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;
rk808_device_shutdown(void)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
rk808_probe(struct i2c_client * client,const struct i2c_device_id * id)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
rk808_remove(struct i2c_client * client)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");
277