1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2023, Linaro Limited
4 */
5
6 #include <linux/bitfield.h>
7 #include <linux/clk.h>
8 #include <linux/delay.h>
9 #include <linux/iopoll.h>
10 #include <linux/mod_devicetable.h>
11 #include <linux/phy/phy.h>
12 #include <linux/platform_device.h>
13 #include <linux/regulator/consumer.h>
14 #include <linux/reset.h>
15
16 #define USB_PHY_UTMI_CTRL0 (0x3c)
17 #define SLEEPM BIT(0)
18 #define OPMODE_MASK GENMASK(4, 3)
19 #define OPMODE_NONDRIVING BIT(3)
20
21 #define USB_PHY_UTMI_CTRL5 (0x50)
22 #define POR BIT(1)
23
24 #define USB_PHY_HS_PHY_CTRL_COMMON0 (0x54)
25 #define PHY_ENABLE BIT(0)
26 #define SIDDQ_SEL BIT(1)
27 #define SIDDQ BIT(2)
28 #define RETENABLEN BIT(3)
29 #define FSEL_MASK GENMASK(6, 4)
30 #define FSEL_19_2_MHZ_VAL (0x0)
31 #define FSEL_38_4_MHZ_VAL (0x4)
32
33 #define USB_PHY_CFG_CTRL_1 (0x58)
34 #define PHY_CFG_PLL_CPBIAS_CNTRL_MASK GENMASK(7, 1)
35
36 #define USB_PHY_CFG_CTRL_2 (0x5c)
37 #define PHY_CFG_PLL_FB_DIV_7_0_MASK GENMASK(7, 0)
38 #define DIV_7_0_19_2_MHZ_VAL (0x90)
39 #define DIV_7_0_38_4_MHZ_VAL (0xc8)
40
41 #define USB_PHY_CFG_CTRL_3 (0x60)
42 #define PHY_CFG_PLL_FB_DIV_11_8_MASK GENMASK(3, 0)
43 #define DIV_11_8_19_2_MHZ_VAL (0x1)
44 #define DIV_11_8_38_4_MHZ_VAL (0x0)
45
46 #define PHY_CFG_PLL_REF_DIV GENMASK(7, 4)
47 #define PLL_REF_DIV_VAL (0x0)
48
49 #define USB_PHY_HS_PHY_CTRL2 (0x64)
50 #define VBUSVLDEXT0 BIT(0)
51 #define USB2_SUSPEND_N BIT(2)
52 #define USB2_SUSPEND_N_SEL BIT(3)
53 #define VBUS_DET_EXT_SEL BIT(4)
54
55 #define USB_PHY_CFG_CTRL_4 (0x68)
56 #define PHY_CFG_PLL_GMP_CNTRL_MASK GENMASK(1, 0)
57 #define PHY_CFG_PLL_INT_CNTRL_MASK GENMASK(7, 2)
58
59 #define USB_PHY_CFG_CTRL_5 (0x6c)
60 #define PHY_CFG_PLL_PROP_CNTRL_MASK GENMASK(4, 0)
61 #define PHY_CFG_PLL_VREF_TUNE_MASK GENMASK(7, 6)
62
63 #define USB_PHY_CFG_CTRL_6 (0x70)
64 #define PHY_CFG_PLL_VCO_CNTRL_MASK GENMASK(2, 0)
65
66 #define USB_PHY_CFG_CTRL_7 (0x74)
67
68 #define USB_PHY_CFG_CTRL_8 (0x78)
69 #define PHY_CFG_TX_FSLS_VREF_TUNE_MASK GENMASK(1, 0)
70 #define PHY_CFG_TX_FSLS_VREG_BYPASS BIT(2)
71 #define PHY_CFG_TX_HS_VREF_TUNE_MASK GENMASK(5, 3)
72 #define PHY_CFG_TX_HS_XV_TUNE_MASK GENMASK(7, 6)
73
74 #define USB_PHY_CFG_CTRL_9 (0x7c)
75 #define PHY_CFG_TX_PREEMP_TUNE_MASK GENMASK(2, 0)
76 #define PHY_CFG_TX_RES_TUNE_MASK GENMASK(4, 3)
77 #define PHY_CFG_TX_RISE_TUNE_MASK GENMASK(6, 5)
78 #define PHY_CFG_RCAL_BYPASS BIT(7)
79
80 #define USB_PHY_CFG_CTRL_10 (0x80)
81
82 #define USB_PHY_CFG0 (0x94)
83 #define DATAPATH_CTRL_OVERRIDE_EN BIT(0)
84 #define CMN_CTRL_OVERRIDE_EN BIT(1)
85
86 #define UTMI_PHY_CMN_CTRL0 (0x98)
87 #define TESTBURNIN BIT(6)
88
89 #define USB_PHY_FSEL_SEL (0xb8)
90 #define FSEL_SEL BIT(0)
91
92 #define USB_PHY_APB_ACCESS_CMD (0x130)
93 #define RW_ACCESS BIT(0)
94 #define APB_START_CMD BIT(1)
95 #define APB_LOGIC_RESET BIT(2)
96
97 #define USB_PHY_APB_ACCESS_STATUS (0x134)
98 #define ACCESS_DONE BIT(0)
99 #define TIMED_OUT BIT(1)
100 #define ACCESS_ERROR BIT(2)
101 #define ACCESS_IN_PROGRESS BIT(3)
102
103 #define USB_PHY_APB_ADDRESS (0x138)
104 #define APB_REG_ADDR_MASK GENMASK(7, 0)
105
106 #define USB_PHY_APB_WRDATA_LSB (0x13c)
107 #define APB_REG_WRDATA_7_0_MASK GENMASK(3, 0)
108
109 #define USB_PHY_APB_WRDATA_MSB (0x140)
110 #define APB_REG_WRDATA_15_8_MASK GENMASK(7, 4)
111
112 #define USB_PHY_APB_RDDATA_LSB (0x144)
113 #define APB_REG_RDDATA_7_0_MASK GENMASK(3, 0)
114
115 #define USB_PHY_APB_RDDATA_MSB (0x148)
116 #define APB_REG_RDDATA_15_8_MASK GENMASK(7, 4)
117
118 static const char * const eusb2_hsphy_vreg_names[] = {
119 "vdd", "vdda12",
120 };
121
122 #define EUSB2_NUM_VREGS ARRAY_SIZE(eusb2_hsphy_vreg_names)
123
124 struct qcom_snps_eusb2_hsphy {
125 struct phy *phy;
126 void __iomem *base;
127
128 struct clk *ref_clk;
129 struct reset_control *phy_reset;
130
131 struct regulator_bulk_data vregs[EUSB2_NUM_VREGS];
132
133 enum phy_mode mode;
134
135 struct phy *repeater;
136 };
137
qcom_snps_eusb2_hsphy_set_mode(struct phy * p,enum phy_mode mode,int submode)138 static int qcom_snps_eusb2_hsphy_set_mode(struct phy *p, enum phy_mode mode, int submode)
139 {
140 struct qcom_snps_eusb2_hsphy *phy = phy_get_drvdata(p);
141
142 phy->mode = mode;
143
144 return phy_set_mode_ext(phy->repeater, mode, submode);
145 }
146
qcom_snps_eusb2_hsphy_write_mask(void __iomem * base,u32 offset,u32 mask,u32 val)147 static void qcom_snps_eusb2_hsphy_write_mask(void __iomem *base, u32 offset,
148 u32 mask, u32 val)
149 {
150 u32 reg;
151
152 reg = readl_relaxed(base + offset);
153 reg &= ~mask;
154 reg |= val & mask;
155 writel_relaxed(reg, base + offset);
156
157 /* Ensure above write is completed */
158 readl_relaxed(base + offset);
159 }
160
qcom_eusb2_default_parameters(struct qcom_snps_eusb2_hsphy * phy)161 static void qcom_eusb2_default_parameters(struct qcom_snps_eusb2_hsphy *phy)
162 {
163 /* default parameters: tx pre-emphasis */
164 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_9,
165 PHY_CFG_TX_PREEMP_TUNE_MASK,
166 FIELD_PREP(PHY_CFG_TX_PREEMP_TUNE_MASK, 0));
167
168 /* tx rise/fall time */
169 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_9,
170 PHY_CFG_TX_RISE_TUNE_MASK,
171 FIELD_PREP(PHY_CFG_TX_RISE_TUNE_MASK, 0x2));
172
173 /* source impedance adjustment */
174 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_9,
175 PHY_CFG_TX_RES_TUNE_MASK,
176 FIELD_PREP(PHY_CFG_TX_RES_TUNE_MASK, 0x1));
177
178 /* dc voltage level adjustement */
179 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_8,
180 PHY_CFG_TX_HS_VREF_TUNE_MASK,
181 FIELD_PREP(PHY_CFG_TX_HS_VREF_TUNE_MASK, 0x3));
182
183 /* transmitter HS crossover adjustement */
184 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_8,
185 PHY_CFG_TX_HS_XV_TUNE_MASK,
186 FIELD_PREP(PHY_CFG_TX_HS_XV_TUNE_MASK, 0x0));
187 }
188
qcom_eusb2_ref_clk_init(struct qcom_snps_eusb2_hsphy * phy)189 static int qcom_eusb2_ref_clk_init(struct qcom_snps_eusb2_hsphy *phy)
190 {
191 unsigned long ref_clk_freq = clk_get_rate(phy->ref_clk);
192
193 switch (ref_clk_freq) {
194 case 19200000:
195 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL_COMMON0,
196 FSEL_MASK,
197 FIELD_PREP(FSEL_MASK, FSEL_19_2_MHZ_VAL));
198
199 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_2,
200 PHY_CFG_PLL_FB_DIV_7_0_MASK,
201 DIV_7_0_19_2_MHZ_VAL);
202
203 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_3,
204 PHY_CFG_PLL_FB_DIV_11_8_MASK,
205 DIV_11_8_19_2_MHZ_VAL);
206 break;
207
208 case 38400000:
209 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL_COMMON0,
210 FSEL_MASK,
211 FIELD_PREP(FSEL_MASK, FSEL_38_4_MHZ_VAL));
212
213 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_2,
214 PHY_CFG_PLL_FB_DIV_7_0_MASK,
215 DIV_7_0_38_4_MHZ_VAL);
216
217 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_3,
218 PHY_CFG_PLL_FB_DIV_11_8_MASK,
219 DIV_11_8_38_4_MHZ_VAL);
220 break;
221
222 default:
223 dev_err(&phy->phy->dev, "unsupported ref_clk_freq:%lu\n", ref_clk_freq);
224 return -EINVAL;
225 }
226
227 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_3,
228 PHY_CFG_PLL_REF_DIV, PLL_REF_DIV_VAL);
229
230 return 0;
231 }
232
qcom_snps_eusb2_hsphy_init(struct phy * p)233 static int qcom_snps_eusb2_hsphy_init(struct phy *p)
234 {
235 struct qcom_snps_eusb2_hsphy *phy = phy_get_drvdata(p);
236 int ret;
237
238 ret = regulator_bulk_enable(ARRAY_SIZE(phy->vregs), phy->vregs);
239 if (ret)
240 return ret;
241
242 ret = phy_init(phy->repeater);
243 if (ret) {
244 dev_err(&p->dev, "repeater init failed. %d\n", ret);
245 goto disable_vreg;
246 }
247
248 ret = clk_prepare_enable(phy->ref_clk);
249 if (ret) {
250 dev_err(&p->dev, "failed to enable ref clock, %d\n", ret);
251 goto disable_vreg;
252 }
253
254 ret = reset_control_assert(phy->phy_reset);
255 if (ret) {
256 dev_err(&p->dev, "failed to assert phy_reset, %d\n", ret);
257 goto disable_ref_clk;
258 }
259
260 usleep_range(100, 150);
261
262 ret = reset_control_deassert(phy->phy_reset);
263 if (ret) {
264 dev_err(&p->dev, "failed to de-assert phy_reset, %d\n", ret);
265 goto disable_ref_clk;
266 }
267
268 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG0,
269 CMN_CTRL_OVERRIDE_EN, CMN_CTRL_OVERRIDE_EN);
270
271 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_UTMI_CTRL5, POR, POR);
272
273 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL_COMMON0,
274 PHY_ENABLE | RETENABLEN, PHY_ENABLE | RETENABLEN);
275
276 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_APB_ACCESS_CMD,
277 APB_LOGIC_RESET, APB_LOGIC_RESET);
278
279 qcom_snps_eusb2_hsphy_write_mask(phy->base, UTMI_PHY_CMN_CTRL0, TESTBURNIN, 0);
280
281 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_FSEL_SEL,
282 FSEL_SEL, FSEL_SEL);
283
284 /* update ref_clk related registers */
285 ret = qcom_eusb2_ref_clk_init(phy);
286 if (ret)
287 goto disable_ref_clk;
288
289 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_1,
290 PHY_CFG_PLL_CPBIAS_CNTRL_MASK,
291 FIELD_PREP(PHY_CFG_PLL_CPBIAS_CNTRL_MASK, 0x1));
292
293 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_4,
294 PHY_CFG_PLL_INT_CNTRL_MASK,
295 FIELD_PREP(PHY_CFG_PLL_INT_CNTRL_MASK, 0x8));
296
297 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_4,
298 PHY_CFG_PLL_GMP_CNTRL_MASK,
299 FIELD_PREP(PHY_CFG_PLL_GMP_CNTRL_MASK, 0x1));
300
301 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_5,
302 PHY_CFG_PLL_PROP_CNTRL_MASK,
303 FIELD_PREP(PHY_CFG_PLL_PROP_CNTRL_MASK, 0x10));
304
305 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_6,
306 PHY_CFG_PLL_VCO_CNTRL_MASK,
307 FIELD_PREP(PHY_CFG_PLL_VCO_CNTRL_MASK, 0x0));
308
309 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_5,
310 PHY_CFG_PLL_VREF_TUNE_MASK,
311 FIELD_PREP(PHY_CFG_PLL_VREF_TUNE_MASK, 0x1));
312
313 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL2,
314 VBUS_DET_EXT_SEL, VBUS_DET_EXT_SEL);
315
316 /* set default parameters */
317 qcom_eusb2_default_parameters(phy);
318
319 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL2,
320 USB2_SUSPEND_N_SEL | USB2_SUSPEND_N,
321 USB2_SUSPEND_N_SEL | USB2_SUSPEND_N);
322
323 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_UTMI_CTRL0, SLEEPM, SLEEPM);
324
325 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL_COMMON0,
326 SIDDQ_SEL, SIDDQ_SEL);
327
328 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL_COMMON0,
329 SIDDQ, 0);
330
331 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_UTMI_CTRL5, POR, 0);
332
333 qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL2,
334 USB2_SUSPEND_N_SEL, 0);
335
336 return 0;
337
338 disable_ref_clk:
339 clk_disable_unprepare(phy->ref_clk);
340
341 disable_vreg:
342 regulator_bulk_disable(ARRAY_SIZE(phy->vregs), phy->vregs);
343
344 return ret;
345 }
346
qcom_snps_eusb2_hsphy_exit(struct phy * p)347 static int qcom_snps_eusb2_hsphy_exit(struct phy *p)
348 {
349 struct qcom_snps_eusb2_hsphy *phy = phy_get_drvdata(p);
350
351 clk_disable_unprepare(phy->ref_clk);
352
353 regulator_bulk_disable(ARRAY_SIZE(phy->vregs), phy->vregs);
354
355 phy_exit(phy->repeater);
356
357 return 0;
358 }
359
360 static const struct phy_ops qcom_snps_eusb2_hsphy_ops = {
361 .init = qcom_snps_eusb2_hsphy_init,
362 .exit = qcom_snps_eusb2_hsphy_exit,
363 .set_mode = qcom_snps_eusb2_hsphy_set_mode,
364 .owner = THIS_MODULE,
365 };
366
qcom_snps_eusb2_hsphy_probe(struct platform_device * pdev)367 static int qcom_snps_eusb2_hsphy_probe(struct platform_device *pdev)
368 {
369 struct device *dev = &pdev->dev;
370 struct device_node *np = dev->of_node;
371 struct qcom_snps_eusb2_hsphy *phy;
372 struct phy_provider *phy_provider;
373 struct phy *generic_phy;
374 int ret, i;
375 int num;
376
377 phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
378 if (!phy)
379 return -ENOMEM;
380
381 phy->base = devm_platform_ioremap_resource(pdev, 0);
382 if (IS_ERR(phy->base))
383 return PTR_ERR(phy->base);
384
385 phy->phy_reset = devm_reset_control_get_exclusive(dev, NULL);
386 if (IS_ERR(phy->phy_reset))
387 return PTR_ERR(phy->phy_reset);
388
389 phy->ref_clk = devm_clk_get(dev, "ref");
390 if (IS_ERR(phy->ref_clk))
391 return dev_err_probe(dev, PTR_ERR(phy->ref_clk),
392 "failed to get ref clk\n");
393
394 num = ARRAY_SIZE(phy->vregs);
395 for (i = 0; i < num; i++)
396 phy->vregs[i].supply = eusb2_hsphy_vreg_names[i];
397
398 ret = devm_regulator_bulk_get(dev, num, phy->vregs);
399 if (ret)
400 return dev_err_probe(dev, ret,
401 "failed to get regulator supplies\n");
402
403 phy->repeater = devm_of_phy_get_by_index(dev, np, 0);
404 if (IS_ERR(phy->repeater))
405 return dev_err_probe(dev, PTR_ERR(phy->repeater),
406 "failed to get repeater\n");
407
408 generic_phy = devm_phy_create(dev, NULL, &qcom_snps_eusb2_hsphy_ops);
409 if (IS_ERR(generic_phy)) {
410 dev_err(dev, "failed to create phy %d\n", ret);
411 return PTR_ERR(generic_phy);
412 }
413
414 dev_set_drvdata(dev, phy);
415 phy_set_drvdata(generic_phy, phy);
416
417 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
418 if (IS_ERR(phy_provider))
419 return PTR_ERR(phy_provider);
420
421 dev_info(dev, "Registered Qcom-eUSB2 phy\n");
422
423 return 0;
424 }
425
426 static const struct of_device_id qcom_snps_eusb2_hsphy_of_match_table[] = {
427 { .compatible = "qcom,sm8550-snps-eusb2-phy", },
428 { },
429 };
430 MODULE_DEVICE_TABLE(of, qcom_snps_eusb2_hsphy_of_match_table);
431
432 static struct platform_driver qcom_snps_eusb2_hsphy_driver = {
433 .probe = qcom_snps_eusb2_hsphy_probe,
434 .driver = {
435 .name = "qcom-snps-eusb2-hsphy",
436 .of_match_table = qcom_snps_eusb2_hsphy_of_match_table,
437 },
438 };
439
440 module_platform_driver(qcom_snps_eusb2_hsphy_driver);
441 MODULE_DESCRIPTION("Qualcomm SNPS eUSB2 HS PHY driver");
442 MODULE_LICENSE("GPL");
443