1
2
3
4
5
6
7
8
9
10
11
12#include <linux/bitfield.h>
13#include <linux/bitops.h>
14#include <linux/clk.h>
15#include <linux/io.h>
16#include <linux/module.h>
17#include <linux/nvmem-consumer.h>
18#include <linux/of.h>
19#include <linux/of_platform.h>
20#include <linux/phy/phy.h>
21#include <linux/platform_device.h>
22#include <linux/regulator/consumer.h>
23#include <linux/reset.h>
24#include <linux/slab.h>
25
26#define HSPHY_CFG0 0x0
27#define HSPHY_CFG0_HS_I_MASK GENMASK(31, 28)
28#define HSPHY_CFG0_HSDISC_MASK GENMASK(27, 26)
29#define HSPHY_CFG0_SWING_MASK GENMASK(17, 16)
30#define HSPHY_CFG0_SEL_T_MASK GENMASK(15, 12)
31#define HSPHY_CFG0_RTERM_MASK GENMASK(7, 6)
32#define HSPHY_CFG0_TRIMMASK (HSPHY_CFG0_HS_I_MASK \
33 | HSPHY_CFG0_SEL_T_MASK \
34 | HSPHY_CFG0_RTERM_MASK)
35
36#define HSPHY_CFG1 0x4
37#define HSPHY_CFG1_DAT_EN BIT(29)
38#define HSPHY_CFG1_ADR_EN BIT(28)
39#define HSPHY_CFG1_ADR_MASK GENMASK(27, 16)
40#define HSPHY_CFG1_DAT_MASK GENMASK(23, 16)
41
42#define PHY_F(regno, msb, lsb) { (regno), (msb), (lsb) }
43
44#define LS_SLEW PHY_F(10, 6, 6)
45#define FS_LS_DRV PHY_F(10, 5, 5)
46
47#define MAX_PHY_PARAMS 2
48
49struct uniphier_u3hsphy_param {
50 struct {
51 int reg_no;
52 int msb;
53 int lsb;
54 } field;
55 u8 value;
56};
57
58struct uniphier_u3hsphy_trim_param {
59 unsigned int rterm;
60 unsigned int sel_t;
61 unsigned int hs_i;
62};
63
64#define trim_param_is_valid(p) ((p)->rterm || (p)->sel_t || (p)->hs_i)
65
66struct uniphier_u3hsphy_priv {
67 struct device *dev;
68 void __iomem *base;
69 struct clk *clk, *clk_parent, *clk_ext;
70 struct reset_control *rst, *rst_parent;
71 struct regulator *vbus;
72 const struct uniphier_u3hsphy_soc_data *data;
73};
74
75struct uniphier_u3hsphy_soc_data {
76 int nparams;
77 const struct uniphier_u3hsphy_param param[MAX_PHY_PARAMS];
78 u32 config0;
79 u32 config1;
80 void (*trim_func)(struct uniphier_u3hsphy_priv *priv, u32 *pconfig,
81 struct uniphier_u3hsphy_trim_param *pt);
82};
83
84static void uniphier_u3hsphy_trim_ld20(struct uniphier_u3hsphy_priv *priv,
85 u32 *pconfig,
86 struct uniphier_u3hsphy_trim_param *pt)
87{
88 *pconfig &= ~HSPHY_CFG0_RTERM_MASK;
89 *pconfig |= FIELD_PREP(HSPHY_CFG0_RTERM_MASK, pt->rterm);
90
91 *pconfig &= ~HSPHY_CFG0_SEL_T_MASK;
92 *pconfig |= FIELD_PREP(HSPHY_CFG0_SEL_T_MASK, pt->sel_t);
93
94 *pconfig &= ~HSPHY_CFG0_HS_I_MASK;
95 *pconfig |= FIELD_PREP(HSPHY_CFG0_HS_I_MASK, pt->hs_i);
96}
97
98static int uniphier_u3hsphy_get_nvparam(struct uniphier_u3hsphy_priv *priv,
99 const char *name, unsigned int *val)
100{
101 struct nvmem_cell *cell;
102 u8 *buf;
103
104 cell = devm_nvmem_cell_get(priv->dev, name);
105 if (IS_ERR(cell))
106 return PTR_ERR(cell);
107
108 buf = nvmem_cell_read(cell, NULL);
109 if (IS_ERR(buf))
110 return PTR_ERR(buf);
111
112 *val = *buf;
113
114 kfree(buf);
115
116 return 0;
117}
118
119static int uniphier_u3hsphy_get_nvparams(struct uniphier_u3hsphy_priv *priv,
120 struct uniphier_u3hsphy_trim_param *pt)
121{
122 int ret;
123
124 ret = uniphier_u3hsphy_get_nvparam(priv, "rterm", &pt->rterm);
125 if (ret)
126 return ret;
127
128 ret = uniphier_u3hsphy_get_nvparam(priv, "sel_t", &pt->sel_t);
129 if (ret)
130 return ret;
131
132 ret = uniphier_u3hsphy_get_nvparam(priv, "hs_i", &pt->hs_i);
133 if (ret)
134 return ret;
135
136 return 0;
137}
138
139static int uniphier_u3hsphy_update_config(struct uniphier_u3hsphy_priv *priv,
140 u32 *pconfig)
141{
142 struct uniphier_u3hsphy_trim_param trim;
143 int ret, trimmed = 0;
144
145 if (priv->data->trim_func) {
146 ret = uniphier_u3hsphy_get_nvparams(priv, &trim);
147 if (ret == -EPROBE_DEFER)
148 return ret;
149
150
151
152
153
154
155 if (!ret && trim_param_is_valid(&trim)) {
156 priv->data->trim_func(priv, pconfig, &trim);
157 trimmed = 1;
158 } else {
159 dev_dbg(priv->dev, "can't get parameter from nvmem\n");
160 }
161 }
162
163
164 if (!trimmed) {
165 *pconfig &= ~HSPHY_CFG0_HSDISC_MASK;
166 *pconfig |= FIELD_PREP(HSPHY_CFG0_HSDISC_MASK, 3);
167 }
168
169 return 0;
170}
171
172static void uniphier_u3hsphy_set_param(struct uniphier_u3hsphy_priv *priv,
173 const struct uniphier_u3hsphy_param *p)
174{
175 u32 val;
176 u32 field_mask = GENMASK(p->field.msb, p->field.lsb);
177 u8 data;
178
179 val = readl(priv->base + HSPHY_CFG1);
180 val &= ~HSPHY_CFG1_ADR_MASK;
181 val |= FIELD_PREP(HSPHY_CFG1_ADR_MASK, p->field.reg_no)
182 | HSPHY_CFG1_ADR_EN;
183 writel(val, priv->base + HSPHY_CFG1);
184
185 val = readl(priv->base + HSPHY_CFG1);
186 val &= ~HSPHY_CFG1_ADR_EN;
187 writel(val, priv->base + HSPHY_CFG1);
188
189 val = readl(priv->base + HSPHY_CFG1);
190 val &= ~FIELD_PREP(HSPHY_CFG1_DAT_MASK, field_mask);
191 data = field_mask & (p->value << p->field.lsb);
192 val |= FIELD_PREP(HSPHY_CFG1_DAT_MASK, data) | HSPHY_CFG1_DAT_EN;
193 writel(val, priv->base + HSPHY_CFG1);
194
195 val = readl(priv->base + HSPHY_CFG1);
196 val &= ~HSPHY_CFG1_DAT_EN;
197 writel(val, priv->base + HSPHY_CFG1);
198}
199
200static int uniphier_u3hsphy_power_on(struct phy *phy)
201{
202 struct uniphier_u3hsphy_priv *priv = phy_get_drvdata(phy);
203 int ret;
204
205 ret = clk_prepare_enable(priv->clk_ext);
206 if (ret)
207 return ret;
208
209 ret = clk_prepare_enable(priv->clk);
210 if (ret)
211 goto out_clk_ext_disable;
212
213 ret = reset_control_deassert(priv->rst);
214 if (ret)
215 goto out_clk_disable;
216
217 if (priv->vbus) {
218 ret = regulator_enable(priv->vbus);
219 if (ret)
220 goto out_rst_assert;
221 }
222
223 return 0;
224
225out_rst_assert:
226 reset_control_assert(priv->rst);
227out_clk_disable:
228 clk_disable_unprepare(priv->clk);
229out_clk_ext_disable:
230 clk_disable_unprepare(priv->clk_ext);
231
232 return ret;
233}
234
235static int uniphier_u3hsphy_power_off(struct phy *phy)
236{
237 struct uniphier_u3hsphy_priv *priv = phy_get_drvdata(phy);
238
239 if (priv->vbus)
240 regulator_disable(priv->vbus);
241
242 reset_control_assert(priv->rst);
243 clk_disable_unprepare(priv->clk);
244 clk_disable_unprepare(priv->clk_ext);
245
246 return 0;
247}
248
249static int uniphier_u3hsphy_init(struct phy *phy)
250{
251 struct uniphier_u3hsphy_priv *priv = phy_get_drvdata(phy);
252 u32 config0, config1;
253 int i, ret;
254
255 ret = clk_prepare_enable(priv->clk_parent);
256 if (ret)
257 return ret;
258
259 ret = reset_control_deassert(priv->rst_parent);
260 if (ret)
261 goto out_clk_disable;
262
263 if (!priv->data->config0 && !priv->data->config1)
264 return 0;
265
266 config0 = priv->data->config0;
267 config1 = priv->data->config1;
268
269 ret = uniphier_u3hsphy_update_config(priv, &config0);
270 if (ret)
271 goto out_rst_assert;
272
273 writel(config0, priv->base + HSPHY_CFG0);
274 writel(config1, priv->base + HSPHY_CFG1);
275
276 for (i = 0; i < priv->data->nparams; i++)
277 uniphier_u3hsphy_set_param(priv, &priv->data->param[i]);
278
279 return 0;
280
281out_rst_assert:
282 reset_control_assert(priv->rst_parent);
283out_clk_disable:
284 clk_disable_unprepare(priv->clk_parent);
285
286 return ret;
287}
288
289static int uniphier_u3hsphy_exit(struct phy *phy)
290{
291 struct uniphier_u3hsphy_priv *priv = phy_get_drvdata(phy);
292
293 reset_control_assert(priv->rst_parent);
294 clk_disable_unprepare(priv->clk_parent);
295
296 return 0;
297}
298
299static const struct phy_ops uniphier_u3hsphy_ops = {
300 .init = uniphier_u3hsphy_init,
301 .exit = uniphier_u3hsphy_exit,
302 .power_on = uniphier_u3hsphy_power_on,
303 .power_off = uniphier_u3hsphy_power_off,
304 .owner = THIS_MODULE,
305};
306
307static int uniphier_u3hsphy_probe(struct platform_device *pdev)
308{
309 struct device *dev = &pdev->dev;
310 struct uniphier_u3hsphy_priv *priv;
311 struct phy_provider *phy_provider;
312 struct resource *res;
313 struct phy *phy;
314
315 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
316 if (!priv)
317 return -ENOMEM;
318
319 priv->dev = dev;
320 priv->data = of_device_get_match_data(dev);
321 if (WARN_ON(!priv->data ||
322 priv->data->nparams > MAX_PHY_PARAMS))
323 return -EINVAL;
324
325 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
326 priv->base = devm_ioremap_resource(dev, res);
327 if (IS_ERR(priv->base))
328 return PTR_ERR(priv->base);
329
330 priv->clk = devm_clk_get(dev, "phy");
331 if (IS_ERR(priv->clk))
332 return PTR_ERR(priv->clk);
333
334 priv->clk_parent = devm_clk_get(dev, "link");
335 if (IS_ERR(priv->clk_parent))
336 return PTR_ERR(priv->clk_parent);
337
338 priv->clk_ext = devm_clk_get_optional(dev, "phy-ext");
339 if (IS_ERR(priv->clk_ext))
340 return PTR_ERR(priv->clk_ext);
341
342 priv->rst = devm_reset_control_get_shared(dev, "phy");
343 if (IS_ERR(priv->rst))
344 return PTR_ERR(priv->rst);
345
346 priv->rst_parent = devm_reset_control_get_shared(dev, "link");
347 if (IS_ERR(priv->rst_parent))
348 return PTR_ERR(priv->rst_parent);
349
350 priv->vbus = devm_regulator_get_optional(dev, "vbus");
351 if (IS_ERR(priv->vbus)) {
352 if (PTR_ERR(priv->vbus) == -EPROBE_DEFER)
353 return PTR_ERR(priv->vbus);
354 priv->vbus = NULL;
355 }
356
357 phy = devm_phy_create(dev, dev->of_node, &uniphier_u3hsphy_ops);
358 if (IS_ERR(phy))
359 return PTR_ERR(phy);
360
361 phy_set_drvdata(phy, priv);
362 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
363
364 return PTR_ERR_OR_ZERO(phy_provider);
365}
366
367static const struct uniphier_u3hsphy_soc_data uniphier_pxs2_data = {
368 .nparams = 0,
369};
370
371static const struct uniphier_u3hsphy_soc_data uniphier_ld20_data = {
372 .nparams = 2,
373 .param = {
374 { LS_SLEW, 1 },
375 { FS_LS_DRV, 1 },
376 },
377 .trim_func = uniphier_u3hsphy_trim_ld20,
378 .config0 = 0x92316680,
379 .config1 = 0x00000106,
380};
381
382static const struct uniphier_u3hsphy_soc_data uniphier_pxs3_data = {
383 .nparams = 0,
384 .trim_func = uniphier_u3hsphy_trim_ld20,
385 .config0 = 0x92316680,
386 .config1 = 0x00000106,
387};
388
389static const struct of_device_id uniphier_u3hsphy_match[] = {
390 {
391 .compatible = "socionext,uniphier-pxs2-usb3-hsphy",
392 .data = &uniphier_pxs2_data,
393 },
394 {
395 .compatible = "socionext,uniphier-ld20-usb3-hsphy",
396 .data = &uniphier_ld20_data,
397 },
398 {
399 .compatible = "socionext,uniphier-pxs3-usb3-hsphy",
400 .data = &uniphier_pxs3_data,
401 },
402 { }
403};
404MODULE_DEVICE_TABLE(of, uniphier_u3hsphy_match);
405
406static struct platform_driver uniphier_u3hsphy_driver = {
407 .probe = uniphier_u3hsphy_probe,
408 .driver = {
409 .name = "uniphier-usb3-hsphy",
410 .of_match_table = uniphier_u3hsphy_match,
411 },
412};
413
414module_platform_driver(uniphier_u3hsphy_driver);
415
416MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
417MODULE_DESCRIPTION("UniPhier HS-PHY driver for USB3 controller");
418MODULE_LICENSE("GPL v2");
419
