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14#include <linux/delay.h>
15#include <linux/extcon.h>
16#include <linux/gpio.h>
17#include <linux/gpio/consumer.h>
18#include <linux/init.h>
19#include <linux/interrupt.h>
20#include <linux/io.h>
21#include <linux/irq.h>
22#include <linux/mfd/syscon.h>
23#include <linux/module.h>
24#include <linux/of.h>
25#include <linux/of_address.h>
26#include <linux/phy/phy.h>
27#include <linux/platform_device.h>
28#include <linux/regmap.h>
29#include <linux/slab.h>
30#include <linux/workqueue.h>
31
32#define ICFG_DRD_AFE 0x0
33#define ICFG_MISC_STAT 0x18
34#define ICFG_DRD_P0CTL 0x1C
35#define ICFG_STRAP_CTRL 0x20
36#define ICFG_FSM_CTRL 0x24
37
38#define ICFG_DEV_BIT BIT(2)
39#define IDM_RST_BIT BIT(0)
40#define AFE_CORERDY_VDDC BIT(18)
41#define PHY_PLL_RESETB BIT(15)
42#define PHY_RESETB BIT(14)
43#define PHY_PLL_LOCK BIT(0)
44
45#define DRD_DEV_MODE BIT(20)
46#define OHCI_OVRCUR_POL BIT(11)
47#define ICFG_OFF_MODE BIT(6)
48#define PLL_LOCK_RETRY 1000
49
50#define EVT_DEVICE 0
51#define EVT_HOST 1
52
53#define DRD_HOST_MODE (BIT(2) | BIT(3))
54#define DRD_DEVICE_MODE (BIT(4) | BIT(5))
55#define DRD_HOST_VAL 0x803
56#define DRD_DEV_VAL 0x807
57#define GPIO_DELAY 20
58
59struct ns2_phy_data;
60struct ns2_phy_driver {
61 void __iomem *icfgdrd_regs;
62 void __iomem *idmdrd_rst_ctrl;
63 void __iomem *crmu_usb2_ctrl;
64 void __iomem *usb2h_strap_reg;
65 struct ns2_phy_data *data;
66 struct extcon_dev *edev;
67 struct gpio_desc *vbus_gpiod;
68 struct gpio_desc *id_gpiod;
69 int id_irq;
70 int vbus_irq;
71 unsigned long debounce_jiffies;
72 struct delayed_work wq_extcon;
73};
74
75struct ns2_phy_data {
76 struct ns2_phy_driver *driver;
77 struct phy *phy;
78 int new_state;
79};
80
81static const unsigned int usb_extcon_cable[] = {
82 EXTCON_USB,
83 EXTCON_USB_HOST,
84 EXTCON_NONE,
85};
86
87static inline int pll_lock_stat(u32 usb_reg, int reg_mask,
88 struct ns2_phy_driver *driver)
89{
90 int retry = PLL_LOCK_RETRY;
91 u32 val;
92
93 do {
94 udelay(1);
95 val = readl(driver->icfgdrd_regs + usb_reg);
96 if (val & reg_mask)
97 return 0;
98 } while (--retry > 0);
99
100 return -EBUSY;
101}
102
103static int ns2_drd_phy_init(struct phy *phy)
104{
105 struct ns2_phy_data *data = phy_get_drvdata(phy);
106 struct ns2_phy_driver *driver = data->driver;
107 u32 val;
108
109 val = readl(driver->icfgdrd_regs + ICFG_FSM_CTRL);
110
111 if (data->new_state == EVT_HOST) {
112 val &= ~DRD_DEVICE_MODE;
113 val |= DRD_HOST_MODE;
114 } else {
115 val &= ~DRD_HOST_MODE;
116 val |= DRD_DEVICE_MODE;
117 }
118 writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
119
120 return 0;
121}
122
123static int ns2_drd_phy_poweroff(struct phy *phy)
124{
125 struct ns2_phy_data *data = phy_get_drvdata(phy);
126 struct ns2_phy_driver *driver = data->driver;
127 u32 val;
128
129 val = readl(driver->crmu_usb2_ctrl);
130 val &= ~AFE_CORERDY_VDDC;
131 writel(val, driver->crmu_usb2_ctrl);
132
133 val = readl(driver->crmu_usb2_ctrl);
134 val &= ~DRD_DEV_MODE;
135 writel(val, driver->crmu_usb2_ctrl);
136
137
138 val = readl(driver->icfgdrd_regs + ICFG_FSM_CTRL);
139 val &= ~(DRD_HOST_MODE | DRD_DEVICE_MODE | ICFG_OFF_MODE);
140 writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
141
142 return 0;
143}
144
145static int ns2_drd_phy_poweron(struct phy *phy)
146{
147 struct ns2_phy_data *data = phy_get_drvdata(phy);
148 struct ns2_phy_driver *driver = data->driver;
149 u32 extcon_event = data->new_state;
150 int ret;
151 u32 val;
152
153 if (extcon_event == EVT_DEVICE) {
154 writel(DRD_DEV_VAL, driver->icfgdrd_regs + ICFG_DRD_P0CTL);
155
156 val = readl(driver->idmdrd_rst_ctrl);
157 val &= ~IDM_RST_BIT;
158 writel(val, driver->idmdrd_rst_ctrl);
159
160 val = readl(driver->crmu_usb2_ctrl);
161 val |= (AFE_CORERDY_VDDC | DRD_DEV_MODE);
162 writel(val, driver->crmu_usb2_ctrl);
163
164
165 val = readl(driver->crmu_usb2_ctrl);
166 val |= (PHY_PLL_RESETB | PHY_RESETB);
167 writel(val, driver->crmu_usb2_ctrl);
168
169 ret = pll_lock_stat(ICFG_MISC_STAT, PHY_PLL_LOCK, driver);
170 if (ret < 0) {
171 dev_err(&phy->dev, "Phy PLL lock failed\n");
172 return ret;
173 }
174 } else {
175 writel(DRD_HOST_VAL, driver->icfgdrd_regs + ICFG_DRD_P0CTL);
176
177 val = readl(driver->crmu_usb2_ctrl);
178 val |= AFE_CORERDY_VDDC;
179 writel(val, driver->crmu_usb2_ctrl);
180
181 ret = pll_lock_stat(ICFG_MISC_STAT, PHY_PLL_LOCK, driver);
182 if (ret < 0) {
183 dev_err(&phy->dev, "Phy PLL lock failed\n");
184 return ret;
185 }
186
187 val = readl(driver->idmdrd_rst_ctrl);
188 val &= ~IDM_RST_BIT;
189 writel(val, driver->idmdrd_rst_ctrl);
190
191
192 val = readl(driver->usb2h_strap_reg);
193 val |= OHCI_OVRCUR_POL;
194 writel(val, driver->usb2h_strap_reg);
195 }
196
197 return 0;
198}
199
200static void connect_change(struct ns2_phy_driver *driver)
201{
202 u32 extcon_event;
203 u32 val;
204
205 extcon_event = driver->data->new_state;
206 val = readl(driver->icfgdrd_regs + ICFG_FSM_CTRL);
207
208 switch (extcon_event) {
209 case EVT_DEVICE:
210 val &= ~(DRD_HOST_MODE | DRD_DEVICE_MODE);
211 writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
212
213 val = (val & ~DRD_HOST_MODE) | DRD_DEVICE_MODE;
214 writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
215
216 val = readl(driver->icfgdrd_regs + ICFG_DRD_P0CTL);
217 val |= ICFG_DEV_BIT;
218 writel(val, driver->icfgdrd_regs + ICFG_DRD_P0CTL);
219 break;
220
221 case EVT_HOST:
222 val &= ~(DRD_HOST_MODE | DRD_DEVICE_MODE);
223 writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
224
225 val = (val & ~DRD_DEVICE_MODE) | DRD_HOST_MODE;
226 writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
227
228 val = readl(driver->usb2h_strap_reg);
229 val |= OHCI_OVRCUR_POL;
230 writel(val, driver->usb2h_strap_reg);
231
232 val = readl(driver->icfgdrd_regs + ICFG_DRD_P0CTL);
233 val &= ~ICFG_DEV_BIT;
234 writel(val, driver->icfgdrd_regs + ICFG_DRD_P0CTL);
235 break;
236
237 default:
238 pr_err("Invalid extcon event\n");
239 break;
240 }
241}
242
243static void extcon_work(struct work_struct *work)
244{
245 struct ns2_phy_driver *driver;
246 int vbus;
247 int id;
248
249 driver = container_of(to_delayed_work(work),
250 struct ns2_phy_driver, wq_extcon);
251
252 id = gpiod_get_value_cansleep(driver->id_gpiod);
253 vbus = gpiod_get_value_cansleep(driver->vbus_gpiod);
254
255 if (!id && vbus) {
256 extcon_set_cable_state_(driver->edev, EXTCON_USB_HOST, true);
257 pr_debug("Host cable connected\n");
258 driver->data->new_state = EVT_HOST;
259 connect_change(driver);
260 } else if (id && !vbus) {
261 extcon_set_cable_state_(driver->edev, EXTCON_USB_HOST, false);
262 extcon_set_cable_state_(driver->edev, EXTCON_USB, false);
263 pr_debug("Cable disconnected\n");
264 } else if (id && vbus) {
265 extcon_set_cable_state_(driver->edev, EXTCON_USB, true);
266 pr_debug("Device cable connected\n");
267 driver->data->new_state = EVT_DEVICE;
268 connect_change(driver);
269 }
270}
271
272static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
273{
274 struct ns2_phy_driver *driver = dev_id;
275
276 queue_delayed_work(system_power_efficient_wq, &driver->wq_extcon,
277 driver->debounce_jiffies);
278
279 return IRQ_HANDLED;
280}
281
282static struct phy_ops ops = {
283 .init = ns2_drd_phy_init,
284 .power_on = ns2_drd_phy_poweron,
285 .power_off = ns2_drd_phy_poweroff,
286 .owner = THIS_MODULE,
287};
288
289static const struct of_device_id ns2_drd_phy_dt_ids[] = {
290 { .compatible = "brcm,ns2-drd-phy", },
291 { }
292};
293MODULE_DEVICE_TABLE(of, ns2_drd_phy_dt_ids);
294
295static int ns2_drd_phy_probe(struct platform_device *pdev)
296{
297 struct phy_provider *phy_provider;
298 struct device *dev = &pdev->dev;
299 struct ns2_phy_driver *driver;
300 struct ns2_phy_data *data;
301 struct resource *res;
302 int ret;
303 u32 val;
304
305 driver = devm_kzalloc(dev, sizeof(struct ns2_phy_driver),
306 GFP_KERNEL);
307 if (!driver)
308 return -ENOMEM;
309
310 driver->data = devm_kzalloc(dev, sizeof(struct ns2_phy_data),
311 GFP_KERNEL);
312 if (!driver->data)
313 return -ENOMEM;
314
315 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "icfg");
316 driver->icfgdrd_regs = devm_ioremap_resource(dev, res);
317 if (IS_ERR(driver->icfgdrd_regs))
318 return PTR_ERR(driver->icfgdrd_regs);
319
320 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rst-ctrl");
321 driver->idmdrd_rst_ctrl = devm_ioremap_resource(dev, res);
322 if (IS_ERR(driver->idmdrd_rst_ctrl))
323 return PTR_ERR(driver->idmdrd_rst_ctrl);
324
325 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "crmu-ctrl");
326 driver->crmu_usb2_ctrl = devm_ioremap_resource(dev, res);
327 if (IS_ERR(driver->crmu_usb2_ctrl))
328 return PTR_ERR(driver->crmu_usb2_ctrl);
329
330 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "usb2-strap");
331 driver->usb2h_strap_reg = devm_ioremap_resource(dev, res);
332 if (IS_ERR(driver->usb2h_strap_reg))
333 return PTR_ERR(driver->usb2h_strap_reg);
334
335
336 driver->id_gpiod = devm_gpiod_get(&pdev->dev, "id", GPIOD_IN);
337 if (IS_ERR(driver->id_gpiod)) {
338 dev_err(dev, "failed to get ID GPIO\n");
339 return PTR_ERR(driver->id_gpiod);
340 }
341 driver->vbus_gpiod = devm_gpiod_get(&pdev->dev, "vbus", GPIOD_IN);
342 if (IS_ERR(driver->vbus_gpiod)) {
343 dev_err(dev, "failed to get VBUS GPIO\n");
344 return PTR_ERR(driver->vbus_gpiod);
345 }
346
347 driver->edev = devm_extcon_dev_allocate(dev, usb_extcon_cable);
348 if (IS_ERR(driver->edev)) {
349 dev_err(dev, "failed to allocate extcon device\n");
350 return -ENOMEM;
351 }
352
353 ret = devm_extcon_dev_register(dev, driver->edev);
354 if (ret < 0) {
355 dev_err(dev, "failed to register extcon device\n");
356 return ret;
357 }
358
359 ret = gpiod_set_debounce(driver->id_gpiod, GPIO_DELAY * 1000);
360 if (ret < 0)
361 driver->debounce_jiffies = msecs_to_jiffies(GPIO_DELAY);
362
363 INIT_DELAYED_WORK(&driver->wq_extcon, extcon_work);
364
365 driver->id_irq = gpiod_to_irq(driver->id_gpiod);
366 if (driver->id_irq < 0) {
367 dev_err(dev, "failed to get ID IRQ\n");
368 return driver->id_irq;
369 }
370
371 driver->vbus_irq = gpiod_to_irq(driver->vbus_gpiod);
372 if (driver->vbus_irq < 0) {
373 dev_err(dev, "failed to get ID IRQ\n");
374 return driver->vbus_irq;
375 }
376
377 ret = devm_request_irq(dev, driver->id_irq, gpio_irq_handler,
378 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
379 "usb_id", driver);
380 if (ret < 0) {
381 dev_err(dev, "failed to request handler for ID IRQ\n");
382 return ret;
383 }
384
385 ret = devm_request_irq(dev, driver->vbus_irq, gpio_irq_handler,
386 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
387 "usb_vbus", driver);
388 if (ret < 0) {
389 dev_err(dev, "failed to request handler for VBUS IRQ\n");
390 return ret;
391 }
392
393 dev_set_drvdata(dev, driver);
394
395
396 val = readl(driver->crmu_usb2_ctrl);
397 val &= ~(AFE_CORERDY_VDDC | PHY_RESETB);
398 writel(val, driver->crmu_usb2_ctrl);
399
400 data = driver->data;
401 data->phy = devm_phy_create(dev, dev->of_node, &ops);
402 if (IS_ERR(data->phy)) {
403 dev_err(dev, "Failed to create usb drd phy\n");
404 return PTR_ERR(data->phy);
405 }
406
407 data->driver = driver;
408 phy_set_drvdata(data->phy, data);
409
410 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
411 if (IS_ERR(phy_provider)) {
412 dev_err(dev, "Failed to register as phy provider\n");
413 return PTR_ERR(phy_provider);
414 }
415
416 platform_set_drvdata(pdev, driver);
417
418 dev_info(dev, "Registered NS2 DRD Phy device\n");
419 queue_delayed_work(system_power_efficient_wq, &driver->wq_extcon,
420 driver->debounce_jiffies);
421
422 return 0;
423}
424
425static struct platform_driver ns2_drd_phy_driver = {
426 .probe = ns2_drd_phy_probe,
427 .driver = {
428 .name = "bcm-ns2-usbphy",
429 .of_match_table = of_match_ptr(ns2_drd_phy_dt_ids),
430 },
431};
432module_platform_driver(ns2_drd_phy_driver);
433
434MODULE_ALIAS("platform:bcm-ns2-drd-phy");
435MODULE_AUTHOR("Broadcom");
436MODULE_DESCRIPTION("Broadcom NS2 USB2 PHY driver");
437MODULE_LICENSE("GPL v2");
438
