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f69a7cf7 CZ |
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 | ||
2adb3b8e DA |
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 | ||
f69a7cf7 CZ |
60 | static const struct regmap_config rk808_regmap_config = { |
61 | .reg_bits = 8, | |
62 | .val_bits = 8, | |
63 | .max_register = RK808_IO_POL_REG, | |
2adb3b8e DA |
64 | .cache_type = REGCACHE_RBTREE, |
65 | .volatile_reg = rk808_is_volatile_reg, | |
f69a7cf7 CZ |
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 }, | |
e19f7428 | 92 | { RK808_DCDC_UV_ACT_REG, BUCK_UV_ACT_MASK, BUCK_UV_ACT_DISABLE}, |
f69a7cf7 CZ |
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 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"); |