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 unsigned int wcd934x_config_regs[] = {
59 WCD934X_INTR_LEVEL0,
60 };
61
62 static const struct regmap_irq_chip wcd934x_regmap_irq_chip = {
63 .name = "wcd934x_irq",
64 .status_base = WCD934X_INTR_PIN1_STATUS0,
65 .mask_base = WCD934X_INTR_PIN1_MASK0,
66 .ack_base = WCD934X_INTR_PIN1_CLEAR0,
67 .num_regs = 4,
68 .irqs = wcd934x_irqs,
69 .num_irqs = ARRAY_SIZE(wcd934x_irqs),
70 .config_base = wcd934x_config_regs,
71 .num_config_bases = ARRAY_SIZE(wcd934x_config_regs),
72 .num_config_regs = 4,
73 .set_type_config = regmap_irq_set_type_config_simple,
74 };
75
wcd934x_is_volatile_register(struct device * dev,unsigned int reg)76 static bool wcd934x_is_volatile_register(struct device *dev, unsigned int reg)
77 {
78 switch (reg) {
79 case WCD934X_INTR_PIN1_STATUS0...WCD934X_INTR_PIN2_CLEAR3:
80 case WCD934X_SWR_AHB_BRIDGE_RD_DATA_0:
81 case WCD934X_SWR_AHB_BRIDGE_RD_DATA_1:
82 case WCD934X_SWR_AHB_BRIDGE_RD_DATA_2:
83 case WCD934X_SWR_AHB_BRIDGE_RD_DATA_3:
84 case WCD934X_SWR_AHB_BRIDGE_ACCESS_STATUS:
85 case WCD934X_ANA_MBHC_RESULT_3:
86 case WCD934X_ANA_MBHC_RESULT_2:
87 case WCD934X_ANA_MBHC_RESULT_1:
88 case WCD934X_ANA_MBHC_MECH:
89 case WCD934X_ANA_MBHC_ELECT:
90 case WCD934X_ANA_MBHC_ZDET:
91 case WCD934X_ANA_MICB2:
92 case WCD934X_ANA_RCO:
93 case WCD934X_ANA_BIAS:
94 return true;
95 default:
96 return false;
97 }
98 };
99
100 static const struct regmap_range_cfg wcd934x_ranges[] = {
101 { .name = "WCD934X",
102 .range_min = 0x0,
103 .range_max = WCD934X_MAX_REGISTER,
104 .selector_reg = WCD934X_SEL_REGISTER,
105 .selector_mask = WCD934X_SEL_MASK,
106 .selector_shift = WCD934X_SEL_SHIFT,
107 .window_start = WCD934X_WINDOW_START,
108 .window_len = WCD934X_WINDOW_LENGTH,
109 },
110 };
111
112 static struct regmap_config wcd934x_regmap_config = {
113 .reg_bits = 16,
114 .val_bits = 8,
115 .cache_type = REGCACHE_RBTREE,
116 .max_register = 0xffff,
117 .can_multi_write = true,
118 .ranges = wcd934x_ranges,
119 .num_ranges = ARRAY_SIZE(wcd934x_ranges),
120 .volatile_reg = wcd934x_is_volatile_register,
121 };
122
wcd934x_bring_up(struct wcd934x_ddata * ddata)123 static int wcd934x_bring_up(struct wcd934x_ddata *ddata)
124 {
125 struct regmap *regmap = ddata->regmap;
126 u16 id_minor, id_major;
127 int ret;
128
129 ret = regmap_bulk_read(regmap, WCD934X_CHIP_TIER_CTRL_CHIP_ID_BYTE0,
130 (u8 *)&id_minor, sizeof(u16));
131 if (ret)
132 return ret;
133
134 ret = regmap_bulk_read(regmap, WCD934X_CHIP_TIER_CTRL_CHIP_ID_BYTE2,
135 (u8 *)&id_major, sizeof(u16));
136 if (ret)
137 return ret;
138
139 dev_info(ddata->dev, "WCD934x chip id major 0x%x, minor 0x%x\n",
140 id_major, id_minor);
141
142 regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x01);
143 regmap_write(regmap, WCD934X_SIDO_NEW_VOUT_A_STARTUP, 0x19);
144 regmap_write(regmap, WCD934X_SIDO_NEW_VOUT_D_STARTUP, 0x15);
145 /* Add 1msec delay for VOUT to settle */
146 usleep_range(1000, 1100);
147 regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x5);
148 regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x7);
149 regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x3);
150 regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x7);
151 regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x3);
152
153 return 0;
154 }
155
wcd934x_slim_status_up(struct slim_device * sdev)156 static int wcd934x_slim_status_up(struct slim_device *sdev)
157 {
158 struct device *dev = &sdev->dev;
159 struct wcd934x_ddata *ddata;
160 int ret;
161
162 ddata = dev_get_drvdata(dev);
163
164 ddata->regmap = regmap_init_slimbus(sdev, &wcd934x_regmap_config);
165 if (IS_ERR(ddata->regmap)) {
166 dev_err(dev, "Error allocating slim regmap\n");
167 return PTR_ERR(ddata->regmap);
168 }
169
170 ret = wcd934x_bring_up(ddata);
171 if (ret) {
172 dev_err(dev, "Failed to bring up WCD934X: err = %d\n", ret);
173 return ret;
174 }
175
176 ret = devm_regmap_add_irq_chip(dev, ddata->regmap, ddata->irq,
177 IRQF_TRIGGER_HIGH, 0,
178 &wcd934x_regmap_irq_chip,
179 &ddata->irq_data);
180 if (ret) {
181 dev_err(dev, "Failed to add IRQ chip: err = %d\n", ret);
182 return ret;
183 }
184
185 ret = mfd_add_devices(dev, PLATFORM_DEVID_AUTO, wcd934x_devices,
186 ARRAY_SIZE(wcd934x_devices), NULL, 0, NULL);
187 if (ret) {
188 dev_err(dev, "Failed to add child devices: err = %d\n",
189 ret);
190 return ret;
191 }
192
193 return ret;
194 }
195
wcd934x_slim_status(struct slim_device * sdev,enum slim_device_status status)196 static int wcd934x_slim_status(struct slim_device *sdev,
197 enum slim_device_status status)
198 {
199 switch (status) {
200 case SLIM_DEVICE_STATUS_UP:
201 return wcd934x_slim_status_up(sdev);
202 case SLIM_DEVICE_STATUS_DOWN:
203 mfd_remove_devices(&sdev->dev);
204 break;
205 default:
206 return -EINVAL;
207 }
208
209 return 0;
210 }
211
wcd934x_slim_probe(struct slim_device * sdev)212 static int wcd934x_slim_probe(struct slim_device *sdev)
213 {
214 struct device *dev = &sdev->dev;
215 struct device_node *np = dev->of_node;
216 struct wcd934x_ddata *ddata;
217 struct gpio_desc *reset_gpio;
218 int ret;
219
220 ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
221 if (!ddata)
222 return -ENOMEM;
223
224 ddata->irq = of_irq_get(np, 0);
225 if (ddata->irq < 0)
226 return dev_err_probe(ddata->dev, ddata->irq,
227 "Failed to get IRQ\n");
228
229 ddata->extclk = devm_clk_get(dev, "extclk");
230 if (IS_ERR(ddata->extclk))
231 return dev_err_probe(dev, PTR_ERR(ddata->extclk),
232 "Failed to get extclk");
233
234 ddata->supplies[0].supply = "vdd-buck";
235 ddata->supplies[1].supply = "vdd-buck-sido";
236 ddata->supplies[2].supply = "vdd-tx";
237 ddata->supplies[3].supply = "vdd-rx";
238 ddata->supplies[4].supply = "vdd-io";
239
240 ret = regulator_bulk_get(dev, WCD934X_MAX_SUPPLY, ddata->supplies);
241 if (ret)
242 return dev_err_probe(dev, ret, "Failed to get supplies\n");
243
244 ret = regulator_bulk_enable(WCD934X_MAX_SUPPLY, ddata->supplies);
245 if (ret)
246 return dev_err_probe(dev, ret, "Failed to enable supplies\n");
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 ret = dev_err_probe(dev, PTR_ERR(reset_gpio),
257 "Failed to get reset gpio\n");
258 goto err_disable_regulators;
259 }
260 msleep(20);
261 gpiod_set_value(reset_gpio, 1);
262 msleep(20);
263
264 ddata->dev = dev;
265 dev_set_drvdata(dev, ddata);
266
267 return 0;
268
269 err_disable_regulators:
270 regulator_bulk_disable(WCD934X_MAX_SUPPLY, ddata->supplies);
271 return ret;
272 }
273
wcd934x_slim_remove(struct slim_device * sdev)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>");
303