GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / mfd / wcd934x.c
1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2019, Linaro Limited
3
4 #include <linux/clk.h>
5 #include <linux/gpio/consumer.h>
6 #include <linux/interrupt.h>
7 #include <linux/kernel.h>
8 #include <linux/mfd/core.h>
9 #include <linux/mfd/wcd934x/registers.h>
10 #include <linux/mfd/wcd934x/wcd934x.h>
11 #include <linux/module.h>
12 #include <linux/of.h>
13 #include <linux/of_irq.h>
14 #include <linux/platform_device.h>
15 #include <linux/regmap.h>
16 #include <linux/regulator/consumer.h>
17 #include <linux/slimbus.h>
18
19 #define WCD934X_REGMAP_IRQ_REG(_irq, _off, _mask)               \
20         [_irq] = {                                              \
21                 .reg_offset = (_off),                           \
22                 .mask = (_mask),                                \
23                 .type = {                                       \
24                         .type_reg_offset = (_off),              \
25                         .types_supported = IRQ_TYPE_EDGE_BOTH,  \
26                         .type_reg_mask  = (_mask),              \
27                         .type_level_low_val = (_mask),          \
28                         .type_level_high_val = (_mask),         \
29                         .type_falling_val = 0,                  \
30                         .type_rising_val = 0,                   \
31                 },                                              \
32         }
33
34 static const struct mfd_cell wcd934x_devices[] = {
35         {
36                 .name = "wcd934x-codec",
37         }, {
38                 .name = "wcd934x-gpio",
39                 .of_compatible = "qcom,wcd9340-gpio",
40         }, {
41                 .name = "wcd934x-soundwire",
42                 .of_compatible = "qcom,soundwire-v1.3.0",
43         },
44 };
45
46 static const struct regmap_irq wcd934x_irqs[] = {
47         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_SLIMBUS, 0, BIT(0)),
48         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_HPH_PA_OCPL_FAULT, 0, BIT(2)),
49         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_HPH_PA_OCPR_FAULT, 0, BIT(3)),
50         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_SW_DET, 1, BIT(0)),
51         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_ELECT_INS_REM_DET, 1, BIT(1)),
52         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_BUTTON_PRESS_DET, 1, BIT(2)),
53         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_BUTTON_RELEASE_DET, 1, BIT(3)),
54         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_ELECT_INS_REM_LEG_DET, 1, BIT(4)),
55         WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_SOUNDWIRE, 2, BIT(4)),
56 };
57
58 static const struct regmap_irq_chip wcd934x_regmap_irq_chip = {
59         .name = "wcd934x_irq",
60         .status_base = WCD934X_INTR_PIN1_STATUS0,
61         .mask_base = WCD934X_INTR_PIN1_MASK0,
62         .ack_base = WCD934X_INTR_PIN1_CLEAR0,
63         .type_base = WCD934X_INTR_LEVEL0,
64         .num_type_reg = 4,
65         .type_in_mask = false,
66         .num_regs = 4,
67         .irqs = wcd934x_irqs,
68         .num_irqs = ARRAY_SIZE(wcd934x_irqs),
69 };
70
71 static bool wcd934x_is_volatile_register(struct device *dev, unsigned int reg)
72 {
73         switch (reg) {
74         case WCD934X_INTR_PIN1_STATUS0...WCD934X_INTR_PIN2_CLEAR3:
75         case WCD934X_SWR_AHB_BRIDGE_RD_DATA_0:
76         case WCD934X_SWR_AHB_BRIDGE_RD_DATA_1:
77         case WCD934X_SWR_AHB_BRIDGE_RD_DATA_2:
78         case WCD934X_SWR_AHB_BRIDGE_RD_DATA_3:
79         case WCD934X_SWR_AHB_BRIDGE_ACCESS_STATUS:
80         case WCD934X_ANA_MBHC_RESULT_3:
81         case WCD934X_ANA_MBHC_RESULT_2:
82         case WCD934X_ANA_MBHC_RESULT_1:
83         case WCD934X_ANA_MBHC_MECH:
84         case WCD934X_ANA_MBHC_ELECT:
85         case WCD934X_ANA_MBHC_ZDET:
86         case WCD934X_ANA_MICB2:
87         case WCD934X_ANA_RCO:
88         case WCD934X_ANA_BIAS:
89                 return true;
90         default:
91                 return false;
92         }
93 };
94
95 static const struct regmap_range_cfg wcd934x_ranges[] = {
96         {       .name = "WCD934X",
97                 .range_min =  0x0,
98                 .range_max =  WCD934X_MAX_REGISTER,
99                 .selector_reg = WCD934X_SEL_REGISTER,
100                 .selector_mask = WCD934X_SEL_MASK,
101                 .selector_shift = WCD934X_SEL_SHIFT,
102                 .window_start = WCD934X_WINDOW_START,
103                 .window_len = WCD934X_WINDOW_LENGTH,
104         },
105 };
106
107 static struct regmap_config wcd934x_regmap_config = {
108         .reg_bits = 16,
109         .val_bits = 8,
110         .cache_type = REGCACHE_RBTREE,
111         .max_register = 0xffff,
112         .can_multi_write = true,
113         .ranges = wcd934x_ranges,
114         .num_ranges = ARRAY_SIZE(wcd934x_ranges),
115         .volatile_reg = wcd934x_is_volatile_register,
116 };
117
118 static int wcd934x_bring_up(struct wcd934x_ddata *ddata)
119 {
120         struct regmap *regmap = ddata->regmap;
121         u16 id_minor, id_major;
122         int ret;
123
124         ret = regmap_bulk_read(regmap, WCD934X_CHIP_TIER_CTRL_CHIP_ID_BYTE0,
125                                (u8 *)&id_minor, sizeof(u16));
126         if (ret)
127                 return ret;
128
129         ret = regmap_bulk_read(regmap, WCD934X_CHIP_TIER_CTRL_CHIP_ID_BYTE2,
130                                (u8 *)&id_major, sizeof(u16));
131         if (ret)
132                 return ret;
133
134         dev_info(ddata->dev, "WCD934x chip id major 0x%x, minor 0x%x\n",
135                  id_major, id_minor);
136
137         regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x01);
138         regmap_write(regmap, WCD934X_SIDO_NEW_VOUT_A_STARTUP, 0x19);
139         regmap_write(regmap, WCD934X_SIDO_NEW_VOUT_D_STARTUP, 0x15);
140         /* Add 1msec delay for VOUT to settle */
141         usleep_range(1000, 1100);
142         regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x5);
143         regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x7);
144         regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x3);
145         regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x7);
146         regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x3);
147
148         return 0;
149 }
150
151 static int wcd934x_slim_status_up(struct slim_device *sdev)
152 {
153         struct device *dev = &sdev->dev;
154         struct wcd934x_ddata *ddata;
155         int ret;
156
157         ddata = dev_get_drvdata(dev);
158
159         ddata->regmap = regmap_init_slimbus(sdev, &wcd934x_regmap_config);
160         if (IS_ERR(ddata->regmap)) {
161                 dev_err(dev, "Error allocating slim regmap\n");
162                 return PTR_ERR(ddata->regmap);
163         }
164
165         ret = wcd934x_bring_up(ddata);
166         if (ret) {
167                 dev_err(dev, "Failed to bring up WCD934X: err = %d\n", ret);
168                 return ret;
169         }
170
171         ret = devm_regmap_add_irq_chip(dev, ddata->regmap, ddata->irq,
172                                        IRQF_TRIGGER_HIGH, 0,
173                                        &wcd934x_regmap_irq_chip,
174                                        &ddata->irq_data);
175         if (ret) {
176                 dev_err(dev, "Failed to add IRQ chip: err = %d\n", ret);
177                 return ret;
178         }
179
180         ret = mfd_add_devices(dev, PLATFORM_DEVID_AUTO, wcd934x_devices,
181                               ARRAY_SIZE(wcd934x_devices), NULL, 0, NULL);
182         if (ret) {
183                 dev_err(dev, "Failed to add child devices: err = %d\n",
184                         ret);
185                 return ret;
186         }
187
188         return ret;
189 }
190
191 static int wcd934x_slim_status(struct slim_device *sdev,
192                                enum slim_device_status status)
193 {
194         switch (status) {
195         case SLIM_DEVICE_STATUS_UP:
196                 return wcd934x_slim_status_up(sdev);
197         case SLIM_DEVICE_STATUS_DOWN:
198                 mfd_remove_devices(&sdev->dev);
199                 break;
200         default:
201                 return -EINVAL;
202         }
203
204         return 0;
205 }
206
207 static int wcd934x_slim_probe(struct slim_device *sdev)
208 {
209         struct device *dev = &sdev->dev;
210         struct device_node *np = dev->of_node;
211         struct wcd934x_ddata *ddata;
212         struct gpio_desc *reset_gpio;
213         int ret;
214
215         ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
216         if (!ddata)
217                 return  -ENOMEM;
218
219         ddata->irq = of_irq_get(np, 0);
220         if (ddata->irq < 0)
221                 return dev_err_probe(ddata->dev, ddata->irq,
222                                      "Failed to get IRQ\n");
223
224         ddata->extclk = devm_clk_get(dev, "extclk");
225         if (IS_ERR(ddata->extclk)) {
226                 dev_err(dev, "Failed to get extclk");
227                 return PTR_ERR(ddata->extclk);
228         }
229
230         ddata->supplies[0].supply = "vdd-buck";
231         ddata->supplies[1].supply = "vdd-buck-sido";
232         ddata->supplies[2].supply = "vdd-tx";
233         ddata->supplies[3].supply = "vdd-rx";
234         ddata->supplies[4].supply = "vdd-io";
235
236         ret = regulator_bulk_get(dev, WCD934X_MAX_SUPPLY, ddata->supplies);
237         if (ret) {
238                 dev_err(dev, "Failed to get supplies: err = %d\n", ret);
239                 return ret;
240         }
241
242         ret = regulator_bulk_enable(WCD934X_MAX_SUPPLY, ddata->supplies);
243         if (ret) {
244                 dev_err(dev, "Failed to enable supplies: err = %d\n", ret);
245                 return ret;
246         }
247
248         /*
249          * For WCD934X, it takes about 600us for the Vout_A and
250          * Vout_D to be ready after BUCK_SIDO is powered up.
251          * SYS_RST_N shouldn't be pulled high during this time
252          */
253         usleep_range(600, 650);
254         reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
255         if (IS_ERR(reset_gpio)) {
256                 return dev_err_probe(dev, PTR_ERR(reset_gpio),
257                                 "Failed to get reset gpio: err = %ld\n", PTR_ERR(reset_gpio));
258         }
259         msleep(20);
260         gpiod_set_value(reset_gpio, 1);
261         msleep(20);
262
263         ddata->dev = dev;
264         dev_set_drvdata(dev, ddata);
265
266         return 0;
267 }
268
269 static void wcd934x_slim_remove(struct slim_device *sdev)
270 {
271         struct wcd934x_ddata *ddata = dev_get_drvdata(&sdev->dev);
272
273         regulator_bulk_disable(WCD934X_MAX_SUPPLY, ddata->supplies);
274         mfd_remove_devices(&sdev->dev);
275 }
276
277 static const struct slim_device_id wcd934x_slim_id[] = {
278         { SLIM_MANF_ID_QCOM, SLIM_PROD_CODE_WCD9340,
279           SLIM_DEV_IDX_WCD9340, SLIM_DEV_INSTANCE_ID_WCD9340 },
280         {}
281 };
282
283 static struct slim_driver wcd934x_slim_driver = {
284         .driver = {
285                 .name = "wcd934x-slim",
286         },
287         .probe = wcd934x_slim_probe,
288         .remove = wcd934x_slim_remove,
289         .device_status = wcd934x_slim_status,
290         .id_table = wcd934x_slim_id,
291 };
292
293 module_slim_driver(wcd934x_slim_driver);
294 MODULE_DESCRIPTION("WCD934X slim driver");
295 MODULE_LICENSE("GPL v2");
296 MODULE_ALIAS("slim:217:250:*");
297 MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>");