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_VB_MON_REG, MASK_ALL, VB_LO_ACT |
93 VB_LO_SEL_3500MV },
94 };
95
96 static const struct regmap_irq rk808_irqs[] = {
97 /* INT_STS */
98 [RK808_IRQ_VOUT_LO] = {
99 .mask = RK808_IRQ_VOUT_LO_MSK,
100 .reg_offset = 0,
101 },
102 [RK808_IRQ_VB_LO] = {
103 .mask = RK808_IRQ_VB_LO_MSK,
104 .reg_offset = 0,
105 },
106 [RK808_IRQ_PWRON] = {
107 .mask = RK808_IRQ_PWRON_MSK,
108 .reg_offset = 0,
109 },
110 [RK808_IRQ_PWRON_LP] = {
111 .mask = RK808_IRQ_PWRON_LP_MSK,
112 .reg_offset = 0,
113 },
114 [RK808_IRQ_HOTDIE] = {
115 .mask = RK808_IRQ_HOTDIE_MSK,
116 .reg_offset = 0,
117 },
118 [RK808_IRQ_RTC_ALARM] = {
119 .mask = RK808_IRQ_RTC_ALARM_MSK,
120 .reg_offset = 0,
121 },
122 [RK808_IRQ_RTC_PERIOD] = {
123 .mask = RK808_IRQ_RTC_PERIOD_MSK,
124 .reg_offset = 0,
125 },
126
127 /* INT_STS2 */
128 [RK808_IRQ_PLUG_IN_INT] = {
129 .mask = RK808_IRQ_PLUG_IN_INT_MSK,
130 .reg_offset = 1,
131 },
132 [RK808_IRQ_PLUG_OUT_INT] = {
133 .mask = RK808_IRQ_PLUG_OUT_INT_MSK,
134 .reg_offset = 1,
135 },
136 };
137
138 static struct regmap_irq_chip rk808_irq_chip = {
139 .name = "rk808",
140 .irqs = rk808_irqs,
141 .num_irqs = ARRAY_SIZE(rk808_irqs),
142 .num_regs = 2,
143 .irq_reg_stride = 2,
144 .status_base = RK808_INT_STS_REG1,
145 .mask_base = RK808_INT_STS_MSK_REG1,
146 .ack_base = RK808_INT_STS_REG1,
147 .init_ack_masked = true,
148 };
149
150 static struct i2c_client *rk808_i2c_client;
rk808_device_shutdown(void)151 static void rk808_device_shutdown(void)
152 {
153 int ret;
154 struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
155
156 if (!rk808) {
157 dev_warn(&rk808_i2c_client->dev,
158 "have no rk808, so do nothing here\n");
159 return;
160 }
161
162 ret = regmap_update_bits(rk808->regmap,
163 RK808_DEVCTRL_REG,
164 DEV_OFF_RST, DEV_OFF_RST);
165 if (ret)
166 dev_err(&rk808_i2c_client->dev, "power off error!\n");
167 }
168
rk808_probe(struct i2c_client * client,const struct i2c_device_id * id)169 static int rk808_probe(struct i2c_client *client,
170 const struct i2c_device_id *id)
171 {
172 struct device_node *np = client->dev.of_node;
173 struct rk808 *rk808;
174 int pm_off = 0;
175 int ret;
176 int i;
177
178 if (!client->irq) {
179 dev_err(&client->dev, "No interrupt support, no core IRQ\n");
180 return -EINVAL;
181 }
182
183 rk808 = devm_kzalloc(&client->dev, sizeof(*rk808), GFP_KERNEL);
184 if (!rk808)
185 return -ENOMEM;
186
187 rk808->regmap = devm_regmap_init_i2c(client, &rk808_regmap_config);
188 if (IS_ERR(rk808->regmap)) {
189 dev_err(&client->dev, "regmap initialization failed\n");
190 return PTR_ERR(rk808->regmap);
191 }
192
193 for (i = 0; i < ARRAY_SIZE(pre_init_reg); i++) {
194 ret = regmap_update_bits(rk808->regmap, pre_init_reg[i].addr,
195 pre_init_reg[i].mask,
196 pre_init_reg[i].value);
197 if (ret) {
198 dev_err(&client->dev,
199 "0x%x write err\n", pre_init_reg[i].addr);
200 return ret;
201 }
202 }
203
204 ret = regmap_add_irq_chip(rk808->regmap, client->irq,
205 IRQF_ONESHOT, -1,
206 &rk808_irq_chip, &rk808->irq_data);
207 if (ret) {
208 dev_err(&client->dev, "Failed to add irq_chip %d\n", ret);
209 return ret;
210 }
211
212 rk808->i2c = client;
213 i2c_set_clientdata(client, rk808);
214
215 ret = mfd_add_devices(&client->dev, -1,
216 rk808s, ARRAY_SIZE(rk808s),
217 NULL, 0, regmap_irq_get_domain(rk808->irq_data));
218 if (ret) {
219 dev_err(&client->dev, "failed to add MFD devices %d\n", ret);
220 goto err_irq;
221 }
222
223 pm_off = of_property_read_bool(np,
224 "rockchip,system-power-controller");
225 if (pm_off && !pm_power_off) {
226 rk808_i2c_client = client;
227 pm_power_off = rk808_device_shutdown;
228 }
229
230 return 0;
231
232 err_irq:
233 regmap_del_irq_chip(client->irq, rk808->irq_data);
234 return ret;
235 }
236
rk808_remove(struct i2c_client * client)237 static int rk808_remove(struct i2c_client *client)
238 {
239 struct rk808 *rk808 = i2c_get_clientdata(client);
240
241 regmap_del_irq_chip(client->irq, rk808->irq_data);
242 mfd_remove_devices(&client->dev);
243 pm_power_off = NULL;
244
245 return 0;
246 }
247
248 static struct of_device_id rk808_of_match[] = {
249 { .compatible = "rockchip,rk808" },
250 { },
251 };
252 MODULE_DEVICE_TABLE(of, rk808_of_match);
253
254 static const struct i2c_device_id rk808_ids[] = {
255 { "rk808" },
256 { },
257 };
258 MODULE_DEVICE_TABLE(i2c, rk808_ids);
259
260 static struct i2c_driver rk808_i2c_driver = {
261 .driver = {
262 .name = "rk808",
263 .of_match_table = rk808_of_match,
264 },
265 .probe = rk808_probe,
266 .remove = rk808_remove,
267 .id_table = rk808_ids,
268 };
269
270 module_i2c_driver(rk808_i2c_driver);
271
272 MODULE_LICENSE("GPL");
273 MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
274 MODULE_AUTHOR("Zhang Qing <zhangqing@rock-chips.com>");
275 MODULE_DESCRIPTION("RK808 PMIC driver");
276