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6#include <linux/delay.h>
7#include <linux/io.h>
8#include <linux/module.h>
9#include <linux/of.h>
10#include <linux/phy/phy.h>
11#include <linux/platform_device.h>
12
13enum bcm_usb_phy_version {
14 BCM_SR_USB_COMBO_PHY,
15 BCM_SR_USB_HS_PHY,
16};
17
18enum bcm_usb_phy_reg {
19 PLL_NDIV_FRAC,
20 PLL_NDIV_INT,
21 PLL_CTRL,
22 PHY_CTRL,
23 PHY_PLL_CTRL,
24};
25
26
27
28static const u8 bcm_usb_combo_phy_ss[] = {
29 [PLL_CTRL] = 0x18,
30 [PHY_CTRL] = 0x14,
31};
32
33static const u8 bcm_usb_combo_phy_hs[] = {
34 [PLL_NDIV_FRAC] = 0x04,
35 [PLL_NDIV_INT] = 0x08,
36 [PLL_CTRL] = 0x0c,
37 [PHY_CTRL] = 0x10,
38};
39
40#define HSPLL_NDIV_INT_VAL 0x13
41#define HSPLL_NDIV_FRAC_VAL 0x1005
42
43static const u8 bcm_usb_hs_phy[] = {
44 [PLL_NDIV_FRAC] = 0x0,
45 [PLL_NDIV_INT] = 0x4,
46 [PLL_CTRL] = 0x8,
47 [PHY_CTRL] = 0xc,
48};
49
50enum pll_ctrl_bits {
51 PLL_RESETB,
52 SSPLL_SUSPEND_EN,
53 PLL_SEQ_START,
54 PLL_LOCK,
55 PLL_PDIV,
56};
57
58static const u8 u3pll_ctrl[] = {
59 [PLL_RESETB] = 0,
60 [SSPLL_SUSPEND_EN] = 1,
61 [PLL_SEQ_START] = 2,
62 [PLL_LOCK] = 3,
63};
64
65#define HSPLL_PDIV_MASK 0xF
66#define HSPLL_PDIV_VAL 0x1
67
68static const u8 u2pll_ctrl[] = {
69 [PLL_PDIV] = 1,
70 [PLL_RESETB] = 5,
71 [PLL_LOCK] = 6,
72};
73
74enum bcm_usb_phy_ctrl_bits {
75 CORERDY,
76 AFE_LDO_PWRDWNB,
77 AFE_PLL_PWRDWNB,
78 AFE_BG_PWRDWNB,
79 PHY_ISO,
80 PHY_RESETB,
81 PHY_PCTL,
82};
83
84#define PHY_PCTL_MASK 0xffff
85
86
87
88
89
90
91#define HSPHY_PCTL_VAL 0x0806
92#define SSPHY_PCTL_VAL 0x0006
93
94static const u8 u3phy_ctrl[] = {
95 [PHY_RESETB] = 1,
96 [PHY_PCTL] = 2,
97};
98
99static const u8 u2phy_ctrl[] = {
100 [CORERDY] = 0,
101 [AFE_LDO_PWRDWNB] = 1,
102 [AFE_PLL_PWRDWNB] = 2,
103 [AFE_BG_PWRDWNB] = 3,
104 [PHY_ISO] = 4,
105 [PHY_RESETB] = 5,
106 [PHY_PCTL] = 6,
107};
108
109struct bcm_usb_phy_cfg {
110 uint32_t type;
111 uint32_t version;
112 void __iomem *regs;
113 struct phy *phy;
114 const u8 *offset;
115};
116
117#define PLL_LOCK_RETRY_COUNT 1000
118
119enum bcm_usb_phy_type {
120 USB_HS_PHY,
121 USB_SS_PHY,
122};
123
124#define NUM_BCM_SR_USB_COMBO_PHYS 2
125
126static inline void bcm_usb_reg32_clrbits(void __iomem *addr, uint32_t clear)
127{
128 writel(readl(addr) & ~clear, addr);
129}
130
131static inline void bcm_usb_reg32_setbits(void __iomem *addr, uint32_t set)
132{
133 writel(readl(addr) | set, addr);
134}
135
136static int bcm_usb_pll_lock_check(void __iomem *addr, u32 bit)
137{
138 int retry;
139 u32 rd_data;
140
141 retry = PLL_LOCK_RETRY_COUNT;
142 do {
143 rd_data = readl(addr);
144 if (rd_data & bit)
145 return 0;
146 udelay(1);
147 } while (--retry > 0);
148
149 pr_err("%s: FAIL\n", __func__);
150 return -ETIMEDOUT;
151}
152
153static int bcm_usb_ss_phy_init(struct bcm_usb_phy_cfg *phy_cfg)
154{
155 int ret = 0;
156 void __iomem *regs = phy_cfg->regs;
157 const u8 *offset;
158 u32 rd_data;
159
160 offset = phy_cfg->offset;
161
162
163 rd_data = readl(regs + offset[PHY_CTRL]);
164 rd_data &= ~(PHY_PCTL_MASK << u3phy_ctrl[PHY_PCTL]);
165 rd_data |= (SSPHY_PCTL_VAL << u3phy_ctrl[PHY_PCTL]);
166 writel(rd_data, regs + offset[PHY_CTRL]);
167
168 bcm_usb_reg32_clrbits(regs + offset[PLL_CTRL],
169 BIT(u3pll_ctrl[SSPLL_SUSPEND_EN]));
170 bcm_usb_reg32_setbits(regs + offset[PLL_CTRL],
171 BIT(u3pll_ctrl[PLL_SEQ_START]));
172 bcm_usb_reg32_setbits(regs + offset[PLL_CTRL],
173 BIT(u3pll_ctrl[PLL_RESETB]));
174
175
176 msleep(30);
177
178 ret = bcm_usb_pll_lock_check(regs + offset[PLL_CTRL],
179 BIT(u3pll_ctrl[PLL_LOCK]));
180
181 return ret;
182}
183
184static int bcm_usb_hs_phy_init(struct bcm_usb_phy_cfg *phy_cfg)
185{
186 int ret = 0;
187 void __iomem *regs = phy_cfg->regs;
188 const u8 *offset;
189 u32 rd_data;
190
191 offset = phy_cfg->offset;
192
193 writel(HSPLL_NDIV_INT_VAL, regs + offset[PLL_NDIV_INT]);
194 writel(HSPLL_NDIV_FRAC_VAL, regs + offset[PLL_NDIV_FRAC]);
195
196 rd_data = readl(regs + offset[PLL_CTRL]);
197 rd_data &= ~(HSPLL_PDIV_MASK << u2pll_ctrl[PLL_PDIV]);
198 rd_data |= (HSPLL_PDIV_VAL << u2pll_ctrl[PLL_PDIV]);
199 writel(rd_data, regs + offset[PLL_CTRL]);
200
201
202 bcm_usb_reg32_setbits(regs + offset[PHY_CTRL],
203 BIT(u2phy_ctrl[CORERDY]));
204
205
206 msleep(30);
207
208 bcm_usb_reg32_setbits(regs + offset[PLL_CTRL],
209 BIT(u2pll_ctrl[PLL_RESETB]));
210 bcm_usb_reg32_setbits(regs + offset[PHY_CTRL],
211 BIT(u2phy_ctrl[PHY_RESETB]));
212
213
214 rd_data = readl(regs + offset[PHY_CTRL]);
215 rd_data &= ~(PHY_PCTL_MASK << u2phy_ctrl[PHY_PCTL]);
216 rd_data |= (HSPHY_PCTL_VAL << u2phy_ctrl[PHY_PCTL]);
217 writel(rd_data, regs + offset[PHY_CTRL]);
218
219
220 msleep(30);
221
222 ret = bcm_usb_pll_lock_check(regs + offset[PLL_CTRL],
223 BIT(u2pll_ctrl[PLL_LOCK]));
224
225 return ret;
226}
227
228static int bcm_usb_phy_reset(struct phy *phy)
229{
230 struct bcm_usb_phy_cfg *phy_cfg = phy_get_drvdata(phy);
231 void __iomem *regs = phy_cfg->regs;
232 const u8 *offset;
233
234 offset = phy_cfg->offset;
235
236 if (phy_cfg->type == USB_HS_PHY) {
237 bcm_usb_reg32_clrbits(regs + offset[PHY_CTRL],
238 BIT(u2phy_ctrl[CORERDY]));
239 bcm_usb_reg32_setbits(regs + offset[PHY_CTRL],
240 BIT(u2phy_ctrl[CORERDY]));
241 }
242
243 return 0;
244}
245
246static int bcm_usb_phy_init(struct phy *phy)
247{
248 struct bcm_usb_phy_cfg *phy_cfg = phy_get_drvdata(phy);
249 int ret = -EINVAL;
250
251 if (phy_cfg->type == USB_SS_PHY)
252 ret = bcm_usb_ss_phy_init(phy_cfg);
253 else if (phy_cfg->type == USB_HS_PHY)
254 ret = bcm_usb_hs_phy_init(phy_cfg);
255
256 return ret;
257}
258
259static struct phy_ops sr_phy_ops = {
260 .init = bcm_usb_phy_init,
261 .reset = bcm_usb_phy_reset,
262 .owner = THIS_MODULE,
263};
264
265static struct phy *bcm_usb_phy_xlate(struct device *dev,
266 struct of_phandle_args *args)
267{
268 struct bcm_usb_phy_cfg *phy_cfg;
269 int phy_idx;
270
271 phy_cfg = dev_get_drvdata(dev);
272 if (!phy_cfg)
273 return ERR_PTR(-EINVAL);
274
275 if (phy_cfg->version == BCM_SR_USB_COMBO_PHY) {
276 phy_idx = args->args[0];
277
278 if (WARN_ON(phy_idx > 1))
279 return ERR_PTR(-ENODEV);
280
281 return phy_cfg[phy_idx].phy;
282 } else
283 return phy_cfg->phy;
284}
285
286static int bcm_usb_phy_create(struct device *dev, struct device_node *node,
287 void __iomem *regs, uint32_t version)
288{
289 struct bcm_usb_phy_cfg *phy_cfg;
290 int idx;
291
292 if (version == BCM_SR_USB_COMBO_PHY) {
293 phy_cfg = devm_kzalloc(dev, NUM_BCM_SR_USB_COMBO_PHYS *
294 sizeof(struct bcm_usb_phy_cfg),
295 GFP_KERNEL);
296 if (!phy_cfg)
297 return -ENOMEM;
298
299 for (idx = 0; idx < NUM_BCM_SR_USB_COMBO_PHYS; idx++) {
300 phy_cfg[idx].regs = regs;
301 phy_cfg[idx].version = version;
302 if (idx == 0) {
303 phy_cfg[idx].offset = bcm_usb_combo_phy_hs;
304 phy_cfg[idx].type = USB_HS_PHY;
305 } else {
306 phy_cfg[idx].offset = bcm_usb_combo_phy_ss;
307 phy_cfg[idx].type = USB_SS_PHY;
308 }
309 phy_cfg[idx].phy = devm_phy_create(dev, node,
310 &sr_phy_ops);
311 if (IS_ERR(phy_cfg[idx].phy))
312 return PTR_ERR(phy_cfg[idx].phy);
313
314 phy_set_drvdata(phy_cfg[idx].phy, &phy_cfg[idx]);
315 }
316 } else if (version == BCM_SR_USB_HS_PHY) {
317 phy_cfg = devm_kzalloc(dev, sizeof(struct bcm_usb_phy_cfg),
318 GFP_KERNEL);
319 if (!phy_cfg)
320 return -ENOMEM;
321
322 phy_cfg->regs = regs;
323 phy_cfg->version = version;
324 phy_cfg->offset = bcm_usb_hs_phy;
325 phy_cfg->type = USB_HS_PHY;
326 phy_cfg->phy = devm_phy_create(dev, node, &sr_phy_ops);
327 if (IS_ERR(phy_cfg->phy))
328 return PTR_ERR(phy_cfg->phy);
329
330 phy_set_drvdata(phy_cfg->phy, phy_cfg);
331 } else
332 return -ENODEV;
333
334 dev_set_drvdata(dev, phy_cfg);
335
336 return 0;
337}
338
339static const struct of_device_id bcm_usb_phy_of_match[] = {
340 {
341 .compatible = "brcm,sr-usb-combo-phy",
342 .data = (void *)BCM_SR_USB_COMBO_PHY,
343 },
344 {
345 .compatible = "brcm,sr-usb-hs-phy",
346 .data = (void *)BCM_SR_USB_HS_PHY,
347 },
348 { },
349};
350MODULE_DEVICE_TABLE(of, bcm_usb_phy_of_match);
351
352static int bcm_usb_phy_probe(struct platform_device *pdev)
353{
354 struct device *dev = &pdev->dev;
355 struct device_node *dn = dev->of_node;
356 const struct of_device_id *of_id;
357 struct resource *res;
358 void __iomem *regs;
359 int ret;
360 enum bcm_usb_phy_version version;
361 struct phy_provider *phy_provider;
362
363 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
364 regs = devm_ioremap_resource(dev, res);
365 if (IS_ERR(regs))
366 return PTR_ERR(regs);
367
368 of_id = of_match_node(bcm_usb_phy_of_match, dn);
369 if (of_id)
370 version = (enum bcm_usb_phy_version)of_id->data;
371 else
372 return -ENODEV;
373
374 ret = bcm_usb_phy_create(dev, dn, regs, version);
375 if (ret)
376 return ret;
377
378 phy_provider = devm_of_phy_provider_register(dev, bcm_usb_phy_xlate);
379
380 return PTR_ERR_OR_ZERO(phy_provider);
381}
382
383static struct platform_driver bcm_usb_phy_driver = {
384 .driver = {
385 .name = "phy-bcm-sr-usb",
386 .of_match_table = bcm_usb_phy_of_match,
387 },
388 .probe = bcm_usb_phy_probe,
389};
390module_platform_driver(bcm_usb_phy_driver);
391
392MODULE_AUTHOR("Broadcom");
393MODULE_DESCRIPTION("Broadcom stingray USB Phy driver");
394MODULE_LICENSE("GPL v2");
395
