Merge branch 'printk-rework' into for-linus
[linux-2.6-microblaze.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.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_gpio.h>
13 #include <linux/of.h>
14 #include <linux/of_irq.h>
15 #include <linux/platform_device.h>
16 #include <linux/regmap.h>
17 #include <linux/regulator/consumer.h>
18 #include <linux/slimbus.h>
19
20 static const struct mfd_cell wcd934x_devices[] = {
21         {
22                 .name = "wcd934x-codec",
23         }, {
24                 .name = "wcd934x-gpio",
25                 .of_compatible = "qcom,wcd9340-gpio",
26         }, {
27                 .name = "wcd934x-soundwire",
28                 .of_compatible = "qcom,soundwire-v1.3.0",
29         },
30 };
31
32 static const struct regmap_irq wcd934x_irqs[] = {
33         [WCD934X_IRQ_SLIMBUS] = {
34                 .reg_offset = 0,
35                 .mask = BIT(0),
36                 .type = {
37                         .type_reg_offset = 0,
38                         .types_supported = IRQ_TYPE_EDGE_BOTH,
39                         .type_reg_mask  = BIT(0),
40                         .type_level_low_val = BIT(0),
41                         .type_level_high_val = BIT(0),
42                         .type_falling_val = 0,
43                         .type_rising_val = 0,
44                 },
45         },
46         [WCD934X_IRQ_SOUNDWIRE] = {
47                 .reg_offset = 2,
48                 .mask = BIT(4),
49                 .type = {
50                         .type_reg_offset = 2,
51                         .types_supported = IRQ_TYPE_EDGE_BOTH,
52                         .type_reg_mask  = BIT(4),
53                         .type_level_low_val = BIT(4),
54                         .type_level_high_val = BIT(4),
55                         .type_falling_val = 0,
56                         .type_rising_val = 0,
57                 },
58         },
59 };
60
61 static const struct regmap_irq_chip wcd934x_regmap_irq_chip = {
62         .name = "wcd934x_irq",
63         .status_base = WCD934X_INTR_PIN1_STATUS0,
64         .mask_base = WCD934X_INTR_PIN1_MASK0,
65         .ack_base = WCD934X_INTR_PIN1_CLEAR0,
66         .type_base = WCD934X_INTR_LEVEL0,
67         .num_type_reg = 4,
68         .type_in_mask = false,
69         .num_regs = 4,
70         .irqs = wcd934x_irqs,
71         .num_irqs = ARRAY_SIZE(wcd934x_irqs),
72 };
73
74 static bool wcd934x_is_volatile_register(struct device *dev, unsigned int reg)
75 {
76         switch (reg) {
77         case WCD934X_INTR_PIN1_STATUS0...WCD934X_INTR_PIN2_CLEAR3:
78         case WCD934X_SWR_AHB_BRIDGE_RD_DATA_0:
79         case WCD934X_SWR_AHB_BRIDGE_RD_DATA_1:
80         case WCD934X_SWR_AHB_BRIDGE_RD_DATA_2:
81         case WCD934X_SWR_AHB_BRIDGE_RD_DATA_3:
82         case WCD934X_SWR_AHB_BRIDGE_ACCESS_STATUS:
83         case WCD934X_ANA_MBHC_RESULT_3:
84         case WCD934X_ANA_MBHC_RESULT_2:
85         case WCD934X_ANA_MBHC_RESULT_1:
86         case WCD934X_ANA_MBHC_MECH:
87         case WCD934X_ANA_MBHC_ELECT:
88         case WCD934X_ANA_MBHC_ZDET:
89         case WCD934X_ANA_MICB2:
90         case WCD934X_ANA_RCO:
91         case WCD934X_ANA_BIAS:
92                 return true;
93         default:
94                 return false;
95         }
96 };
97
98 static const struct regmap_range_cfg wcd934x_ranges[] = {
99         {       .name = "WCD934X",
100                 .range_min =  0x0,
101                 .range_max =  WCD934X_MAX_REGISTER,
102                 .selector_reg = WCD934X_SEL_REGISTER,
103                 .selector_mask = WCD934X_SEL_MASK,
104                 .selector_shift = WCD934X_SEL_SHIFT,
105                 .window_start = WCD934X_WINDOW_START,
106                 .window_len = WCD934X_WINDOW_LENGTH,
107         },
108 };
109
110 static struct regmap_config wcd934x_regmap_config = {
111         .reg_bits = 16,
112         .val_bits = 8,
113         .cache_type = REGCACHE_RBTREE,
114         .max_register = 0xffff,
115         .can_multi_write = true,
116         .ranges = wcd934x_ranges,
117         .num_ranges = ARRAY_SIZE(wcd934x_ranges),
118         .volatile_reg = wcd934x_is_volatile_register,
119 };
120
121 static int wcd934x_bring_up(struct wcd934x_ddata *ddata)
122 {
123         struct regmap *regmap = ddata->regmap;
124         u16 id_minor, id_major;
125         int ret;
126
127         ret = regmap_bulk_read(regmap, WCD934X_CHIP_TIER_CTRL_CHIP_ID_BYTE0,
128                                (u8 *)&id_minor, sizeof(u16));
129         if (ret)
130                 return ret;
131
132         ret = regmap_bulk_read(regmap, WCD934X_CHIP_TIER_CTRL_CHIP_ID_BYTE2,
133                                (u8 *)&id_major, sizeof(u16));
134         if (ret)
135                 return ret;
136
137         dev_info(ddata->dev, "WCD934x chip id major 0x%x, minor 0x%x\n",
138                  id_major, id_minor);
139
140         regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x01);
141         regmap_write(regmap, WCD934X_SIDO_NEW_VOUT_A_STARTUP, 0x19);
142         regmap_write(regmap, WCD934X_SIDO_NEW_VOUT_D_STARTUP, 0x15);
143         /* Add 1msec delay for VOUT to settle */
144         usleep_range(1000, 1100);
145         regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x5);
146         regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x7);
147         regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x3);
148         regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x7);
149         regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x3);
150
151         return 0;
152 }
153
154 static int wcd934x_slim_status_up(struct slim_device *sdev)
155 {
156         struct device *dev = &sdev->dev;
157         struct wcd934x_ddata *ddata;
158         int ret;
159
160         ddata = dev_get_drvdata(dev);
161
162         ddata->regmap = regmap_init_slimbus(sdev, &wcd934x_regmap_config);
163         if (IS_ERR(ddata->regmap)) {
164                 dev_err(dev, "Error allocating slim regmap\n");
165                 return PTR_ERR(ddata->regmap);
166         }
167
168         ret = wcd934x_bring_up(ddata);
169         if (ret) {
170                 dev_err(dev, "Failed to bring up WCD934X: err = %d\n", ret);
171                 return ret;
172         }
173
174         ret = devm_regmap_add_irq_chip(dev, ddata->regmap, ddata->irq,
175                                        IRQF_TRIGGER_HIGH, 0,
176                                        &wcd934x_regmap_irq_chip,
177                                        &ddata->irq_data);
178         if (ret) {
179                 dev_err(dev, "Failed to add IRQ chip: err = %d\n", ret);
180                 return ret;
181         }
182
183         ret = mfd_add_devices(dev, PLATFORM_DEVID_AUTO, wcd934x_devices,
184                               ARRAY_SIZE(wcd934x_devices), NULL, 0, NULL);
185         if (ret) {
186                 dev_err(dev, "Failed to add child devices: err = %d\n",
187                         ret);
188                 return ret;
189         }
190
191         return ret;
192 }
193
194 static int wcd934x_slim_status(struct slim_device *sdev,
195                                enum slim_device_status status)
196 {
197         switch (status) {
198         case SLIM_DEVICE_STATUS_UP:
199                 return wcd934x_slim_status_up(sdev);
200         case SLIM_DEVICE_STATUS_DOWN:
201                 mfd_remove_devices(&sdev->dev);
202                 break;
203         default:
204                 return -EINVAL;
205         }
206
207         return 0;
208 }
209
210 static int wcd934x_slim_probe(struct slim_device *sdev)
211 {
212         struct device *dev = &sdev->dev;
213         struct device_node *np = dev->of_node;
214         struct wcd934x_ddata *ddata;
215         int reset_gpio, ret;
216
217         ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
218         if (!ddata)
219                 return  -ENOMEM;
220
221         ddata->irq = of_irq_get(np, 0);
222         if (ddata->irq < 0)
223                 return dev_err_probe(ddata->dev, ddata->irq,
224                                      "Failed to get IRQ\n");
225
226         reset_gpio = of_get_named_gpio(np, "reset-gpios", 0);
227         if (reset_gpio < 0) {
228                 dev_err(dev, "Failed to get reset gpio: err = %d\n",
229                         reset_gpio);
230                 return reset_gpio;
231         }
232
233         ddata->extclk = devm_clk_get(dev, "extclk");
234         if (IS_ERR(ddata->extclk)) {
235                 dev_err(dev, "Failed to get extclk");
236                 return PTR_ERR(ddata->extclk);
237         }
238
239         ddata->supplies[0].supply = "vdd-buck";
240         ddata->supplies[1].supply = "vdd-buck-sido";
241         ddata->supplies[2].supply = "vdd-tx";
242         ddata->supplies[3].supply = "vdd-rx";
243         ddata->supplies[4].supply = "vdd-io";
244
245         ret = regulator_bulk_get(dev, WCD934X_MAX_SUPPLY, ddata->supplies);
246         if (ret) {
247                 dev_err(dev, "Failed to get supplies: err = %d\n", ret);
248                 return ret;
249         }
250
251         ret = regulator_bulk_enable(WCD934X_MAX_SUPPLY, ddata->supplies);
252         if (ret) {
253                 dev_err(dev, "Failed to enable supplies: err = %d\n", ret);
254                 return ret;
255         }
256
257         /*
258          * For WCD934X, it takes about 600us for the Vout_A and
259          * Vout_D to be ready after BUCK_SIDO is powered up.
260          * SYS_RST_N shouldn't be pulled high during this time
261          */
262         usleep_range(600, 650);
263         gpio_direction_output(reset_gpio, 0);
264         msleep(20);
265         gpio_set_value(reset_gpio, 1);
266         msleep(20);
267
268         ddata->dev = dev;
269         dev_set_drvdata(dev, ddata);
270
271         return 0;
272 }
273
274 static void wcd934x_slim_remove(struct slim_device *sdev)
275 {
276         struct wcd934x_ddata *ddata = dev_get_drvdata(&sdev->dev);
277
278         regulator_bulk_disable(WCD934X_MAX_SUPPLY, ddata->supplies);
279         mfd_remove_devices(&sdev->dev);
280 }
281
282 static const struct slim_device_id wcd934x_slim_id[] = {
283         { SLIM_MANF_ID_QCOM, SLIM_PROD_CODE_WCD9340,
284           SLIM_DEV_IDX_WCD9340, SLIM_DEV_INSTANCE_ID_WCD9340 },
285         {}
286 };
287
288 static struct slim_driver wcd934x_slim_driver = {
289         .driver = {
290                 .name = "wcd934x-slim",
291         },
292         .probe = wcd934x_slim_probe,
293         .remove = wcd934x_slim_remove,
294         .device_status = wcd934x_slim_status,
295         .id_table = wcd934x_slim_id,
296 };
297
298 module_slim_driver(wcd934x_slim_driver);
299 MODULE_DESCRIPTION("WCD934X slim driver");
300 MODULE_LICENSE("GPL v2");
301 MODULE_ALIAS("slim:217:250:*");
302 MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>");