1
2
3
4
5
6
7
8
9
10
11
12
13
14#include <linux/delay.h>
15#include <linux/extcon-provider.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/iopoll.h>
22#include <linux/irq.h>
23#include <linux/mfd/syscon.h>
24#include <linux/module.h>
25#include <linux/of.h>
26#include <linux/of_address.h>
27#include <linux/phy/phy.h>
28#include <linux/platform_device.h>
29#include <linux/regmap.h>
30#include <linux/slab.h>
31#include <linux/workqueue.h>
32
33#define ICFG_DRD_AFE 0x0
34#define ICFG_MISC_STAT 0x18
35#define ICFG_DRD_P0CTL 0x1C
36#define ICFG_STRAP_CTRL 0x20
37#define ICFG_FSM_CTRL 0x24
38
39#define ICFG_DEV_BIT BIT(2)
40#define IDM_RST_BIT BIT(0)
41#define AFE_CORERDY_VDDC BIT(18)
42#define PHY_PLL_RESETB BIT(15)
43#define PHY_RESETB BIT(14)
44#define PHY_PLL_LOCK BIT(0)
45
46#define DRD_DEV_MODE BIT(20)
47#define OHCI_OVRCUR_POL BIT(11)
48#define ICFG_OFF_MODE BIT(6)
49#define PLL_LOCK_RETRY 1000
50
51#define EVT_DEVICE 0
52#define EVT_HOST 1
53
54#define DRD_HOST_MODE (BIT(2) | BIT(3))
55#define DRD_DEVICE_MODE (BIT(4) | BIT(5))
56#define DRD_HOST_VAL 0x803
57#define DRD_DEV_VAL 0x807
58#define GPIO_DELAY 20
59
60struct ns2_phy_data;
61struct ns2_phy_driver {
62 void __iomem *icfgdrd_regs;
63 void __iomem *idmdrd_rst_ctrl;
64 void __iomem *crmu_usb2_ctrl;
65 void __iomem *usb2h_strap_reg;
66 struct ns2_phy_data *data;
67 struct extcon_dev *edev;
68 struct gpio_desc *vbus_gpiod;
69 struct gpio_desc *id_gpiod;
70 int id_irq;
71 int vbus_irq;
72 unsigned long debounce_jiffies;
73 struct delayed_work wq_extcon;
74};
75
76struct ns2_phy_data {
77 struct ns2_phy_driver *driver;
78 struct phy *phy;
79 int new_state;
80};
81
82static const unsigned int usb_extcon_cable[] = {
83 EXTCON_USB,
84 EXTCON_USB_HOST,
85 EXTCON_NONE,
86};
87
88static inline int pll_lock_stat(u32 usb_reg, int reg_mask,
89 struct ns2_phy_driver *driver)
90{
91 u32 val;
92
93 return readl_poll_timeout_atomic(driver->icfgdrd_regs + usb_reg,
94 val, (val & reg_mask), 1,
95 PLL_LOCK_RETRY);
96}
97
98static int ns2_drd_phy_init(struct phy *phy)
99{
100 struct ns2_phy_data *data = phy_get_drvdata(phy);
101 struct ns2_phy_driver *driver = data->driver;
102 u32 val;
103
104 val = readl(driver->icfgdrd_regs + ICFG_FSM_CTRL);
105
106 if (data->new_state == EVT_HOST) {
107 val &= ~DRD_DEVICE_MODE;
108 val |= DRD_HOST_MODE;
109 } else {
110 val &= ~DRD_HOST_MODE;
111 val |= DRD_DEVICE_MODE;
112 }
113 writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
114
115 return 0;
116}
117
118static int ns2_drd_phy_poweroff(struct phy *phy)
119{
120 struct ns2_phy_data *data = phy_get_drvdata(phy);
121 struct ns2_phy_driver *driver = data->driver;
122 u32 val;
123
124 val = readl(driver->crmu_usb2_ctrl);
125 val &= ~AFE_CORERDY_VDDC;
126 writel(val, driver->crmu_usb2_ctrl);
127
128 val = readl(driver->crmu_usb2_ctrl);
129 val &= ~DRD_DEV_MODE;
130 writel(val, driver->crmu_usb2_ctrl);
131
132
133 val = readl(driver->icfgdrd_regs + ICFG_FSM_CTRL);
134 val &= ~(DRD_HOST_MODE | DRD_DEVICE_MODE | ICFG_OFF_MODE);
135 writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
136
137 return 0;
138}
139
140static int ns2_drd_phy_poweron(struct phy *phy)
141{
142 struct ns2_phy_data *data = phy_get_drvdata(phy);
143 struct ns2_phy_driver *driver = data->driver;
144 u32 extcon_event = data->new_state;
145 int ret;
146 u32 val;
147
148 if (extcon_event == EVT_DEVICE) {
149 writel(DRD_DEV_VAL, driver->icfgdrd_regs + ICFG_DRD_P0CTL);
150
151 val = readl(driver->idmdrd_rst_ctrl);
152 val &= ~IDM_RST_BIT;
153 writel(val, driver->idmdrd_rst_ctrl);
154
155 val = readl(driver->crmu_usb2_ctrl);
156 val |= (AFE_CORERDY_VDDC | DRD_DEV_MODE);
157 writel(val, driver->crmu_usb2_ctrl);
158
159
160 val = readl(driver->crmu_usb2_ctrl);
161 val |= (PHY_PLL_RESETB | PHY_RESETB);
162 writel(val, driver->crmu_usb2_ctrl);
163
164 ret = pll_lock_stat(ICFG_MISC_STAT, PHY_PLL_LOCK, driver);
165 if (ret < 0) {
166 dev_err(&phy->dev, "Phy PLL lock failed\n");
167 return ret;
168 }
169 } else {
170 writel(DRD_HOST_VAL, driver->icfgdrd_regs + ICFG_DRD_P0CTL);
171
172 val = readl(driver->crmu_usb2_ctrl);
173 val |= AFE_CORERDY_VDDC;
174 writel(val, driver->crmu_usb2_ctrl);
175
176 ret = pll_lock_stat(ICFG_MISC_STAT, PHY_PLL_LOCK, driver);
177 if (ret < 0) {
178 dev_err(&phy->dev, "Phy PLL lock failed\n");
179 return ret;
180 }
181
182 val = readl(driver->idmdrd_rst_ctrl);
183 val &= ~IDM_RST_BIT;
184 writel(val, driver->idmdrd_rst_ctrl);
185
186
187 val = readl(driver->usb2h_strap_reg);
188 val |= OHCI_OVRCUR_POL;
189 writel(val, driver->usb2h_strap_reg);
190 }
191
192 return 0;
193}
194
195static void connect_change(struct ns2_phy_driver *driver)
196{
197 u32 extcon_event;
198 u32 val;
199
200 extcon_event = driver->data->new_state;
201 val = readl(driver->icfgdrd_regs + ICFG_FSM_CTRL);
202
203 switch (extcon_event) {
204 case EVT_DEVICE:
205 val &= ~(DRD_HOST_MODE | DRD_DEVICE_MODE);
206 writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
207
208 val = (val & ~DRD_HOST_MODE) | DRD_DEVICE_MODE;
209 writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
210
211 val = readl(driver->icfgdrd_regs + ICFG_DRD_P0CTL);
212 val |= ICFG_DEV_BIT;
213 writel(val, driver->icfgdrd_regs + ICFG_DRD_P0CTL);
214 break;
215
216 case EVT_HOST:
217 val &= ~(DRD_HOST_MODE | DRD_DEVICE_MODE);
218 writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
219
220 val = (val & ~DRD_DEVICE_MODE) | DRD_HOST_MODE;
221 writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
222
223 val = readl(driver->usb2h_strap_reg);
224 val |= OHCI_OVRCUR_POL;
225 writel(val, driver->usb2h_strap_reg);
226
227 val = readl(driver->icfgdrd_regs + ICFG_DRD_P0CTL);
228 val &= ~ICFG_DEV_BIT;
229 writel(val, driver->icfgdrd_regs + ICFG_DRD_P0CTL);
230 break;
231
232 default:
233 pr_err("Invalid extcon event\n");
234 break;
235 }
236}
237
238static void extcon_work(struct work_struct *work)
239{
240 struct ns2_phy_driver *driver;
241 int vbus;
242 int id;
243
244 driver = container_of(to_delayed_work(work),
245 struct ns2_phy_driver, wq_extcon);
246
247 id = gpiod_get_value_cansleep(driver->id_gpiod);
248 vbus = gpiod_get_value_cansleep(driver->vbus_gpiod);
249
250 if (!id && vbus) {
251 extcon_set_state_sync(driver->edev, EXTCON_USB_HOST, true);
252 pr_debug("Host cable connected\n");
253 driver->data->new_state = EVT_HOST;
254 connect_change(driver);
255 } else if (id && !vbus) {
256 extcon_set_state_sync(driver->edev, EXTCON_USB_HOST, false);
257 extcon_set_state_sync(driver->edev, EXTCON_USB, false);
258 pr_debug("Cable disconnected\n");
259 } else if (id && vbus) {
260 extcon_set_state_sync(driver->edev, EXTCON_USB, true);
261 pr_debug("Device cable connected\n");
262 driver->data->new_state = EVT_DEVICE;
263 connect_change(driver);
264 }
265}
266
267static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
268{
269 struct ns2_phy_driver *driver = dev_id;
270
271 queue_delayed_work(system_power_efficient_wq, &driver->wq_extcon,
272 driver->debounce_jiffies);
273
274 return IRQ_HANDLED;
275}
276
277static const struct phy_ops ops = {
278 .init = ns2_drd_phy_init,
279 .power_on = ns2_drd_phy_poweron,
280 .power_off = ns2_drd_phy_poweroff,
281 .owner = THIS_MODULE,
282};
283
284static const struct of_device_id ns2_drd_phy_dt_ids[] = {
285 { .compatible = "brcm,ns2-drd-phy", },
286 { }
287};
288MODULE_DEVICE_TABLE(of, ns2_drd_phy_dt_ids);
289
290static int ns2_drd_phy_probe(struct platform_device *pdev)
291{
292 struct phy_provider *phy_provider;
293 struct device *dev = &pdev->dev;
294 struct ns2_phy_driver *driver;
295 struct ns2_phy_data *data;
296 int ret;
297 u32 val;
298
299 driver = devm_kzalloc(dev, sizeof(struct ns2_phy_driver),
300 GFP_KERNEL);
301 if (!driver)
302 return -ENOMEM;
303
304 driver->data = devm_kzalloc(dev, sizeof(struct ns2_phy_data),
305 GFP_KERNEL);
306 if (!driver->data)
307 return -ENOMEM;
308
309 driver->icfgdrd_regs = devm_platform_ioremap_resource_byname(pdev, "icfg");
310 if (IS_ERR(driver->icfgdrd_regs))
311 return PTR_ERR(driver->icfgdrd_regs);
312
313 driver->idmdrd_rst_ctrl = devm_platform_ioremap_resource_byname(pdev, "rst-ctrl");
314 if (IS_ERR(driver->idmdrd_rst_ctrl))
315 return PTR_ERR(driver->idmdrd_rst_ctrl);
316
317 driver->crmu_usb2_ctrl = devm_platform_ioremap_resource_byname(pdev, "crmu-ctrl");
318 if (IS_ERR(driver->crmu_usb2_ctrl))
319 return PTR_ERR(driver->crmu_usb2_ctrl);
320
321 driver->usb2h_strap_reg = devm_platform_ioremap_resource_byname(pdev, "usb2-strap");
322 if (IS_ERR(driver->usb2h_strap_reg))
323 return PTR_ERR(driver->usb2h_strap_reg);
324
325
326 driver->id_gpiod = devm_gpiod_get(&pdev->dev, "id", GPIOD_IN);
327 if (IS_ERR(driver->id_gpiod)) {
328 dev_err(dev, "failed to get ID GPIO\n");
329 return PTR_ERR(driver->id_gpiod);
330 }
331 driver->vbus_gpiod = devm_gpiod_get(&pdev->dev, "vbus", GPIOD_IN);
332 if (IS_ERR(driver->vbus_gpiod)) {
333 dev_err(dev, "failed to get VBUS GPIO\n");
334 return PTR_ERR(driver->vbus_gpiod);
335 }
336
337 driver->edev = devm_extcon_dev_allocate(dev, usb_extcon_cable);
338 if (IS_ERR(driver->edev)) {
339 dev_err(dev, "failed to allocate extcon device\n");
340 return -ENOMEM;
341 }
342
343 ret = devm_extcon_dev_register(dev, driver->edev);
344 if (ret < 0) {
345 dev_err(dev, "failed to register extcon device\n");
346 return ret;
347 }
348
349 ret = gpiod_set_debounce(driver->id_gpiod, GPIO_DELAY * 1000);
350 if (ret < 0)
351 driver->debounce_jiffies = msecs_to_jiffies(GPIO_DELAY);
352
353 INIT_DELAYED_WORK(&driver->wq_extcon, extcon_work);
354
355 driver->id_irq = gpiod_to_irq(driver->id_gpiod);
356 if (driver->id_irq < 0) {
357 dev_err(dev, "failed to get ID IRQ\n");
358 return driver->id_irq;
359 }
360
361 driver->vbus_irq = gpiod_to_irq(driver->vbus_gpiod);
362 if (driver->vbus_irq < 0) {
363 dev_err(dev, "failed to get ID IRQ\n");
364 return driver->vbus_irq;
365 }
366
367 ret = devm_request_irq(dev, driver->id_irq, gpio_irq_handler,
368 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
369 "usb_id", driver);
370 if (ret < 0) {
371 dev_err(dev, "failed to request handler for ID IRQ\n");
372 return ret;
373 }
374
375 ret = devm_request_irq(dev, driver->vbus_irq, gpio_irq_handler,
376 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
377 "usb_vbus", driver);
378 if (ret < 0) {
379 dev_err(dev, "failed to request handler for VBUS IRQ\n");
380 return ret;
381 }
382
383 dev_set_drvdata(dev, driver);
384
385
386 val = readl(driver->crmu_usb2_ctrl);
387 val &= ~(AFE_CORERDY_VDDC | PHY_RESETB);
388 writel(val, driver->crmu_usb2_ctrl);
389
390 data = driver->data;
391 data->phy = devm_phy_create(dev, dev->of_node, &ops);
392 if (IS_ERR(data->phy)) {
393 dev_err(dev, "Failed to create usb drd phy\n");
394 return PTR_ERR(data->phy);
395 }
396
397 data->driver = driver;
398 phy_set_drvdata(data->phy, data);
399
400 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
401 if (IS_ERR(phy_provider)) {
402 dev_err(dev, "Failed to register as phy provider\n");
403 return PTR_ERR(phy_provider);
404 }
405
406 platform_set_drvdata(pdev, driver);
407
408 dev_info(dev, "Registered NS2 DRD Phy device\n");
409 queue_delayed_work(system_power_efficient_wq, &driver->wq_extcon,
410 driver->debounce_jiffies);
411
412 return 0;
413}
414
415static struct platform_driver ns2_drd_phy_driver = {
416 .probe = ns2_drd_phy_probe,
417 .driver = {
418 .name = "bcm-ns2-usbphy",
419 .of_match_table = of_match_ptr(ns2_drd_phy_dt_ids),
420 },
421};
422module_platform_driver(ns2_drd_phy_driver);
423
424MODULE_ALIAS("platform:bcm-ns2-drd-phy");
425MODULE_AUTHOR("Broadcom");
426MODULE_DESCRIPTION("Broadcom NS2 USB2 PHY driver");
427MODULE_LICENSE("GPL v2");
428
