1// SPDX-License-Identifier: GPL-2.0
2/*
3 * mtu3_core.c - hardware access layer and gadget init/exit of
4 * MediaTek usb3 Dual-Role Controller Driver
5 *
6 * Copyright (C) 2016 MediaTek Inc.
7 *
8 * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
9 */
10
11#include <linux/dma-mapping.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/of_address.h>
15#include <linux/of_irq.h>
16#include <linux/platform_device.h>
17
18#include "mtu3.h"
19#include "mtu3_dr.h"
20#include "mtu3_debug.h"
21#include "mtu3_trace.h"
22
23static int ep_fifo_alloc(struct mtu3_ep *mep, u32 seg_size)
24{
25 struct mtu3_fifo_info *fifo = mep->fifo;
26 u32 num_bits = DIV_ROUND_UP(seg_size, MTU3_EP_FIFO_UNIT);
27 u32 start_bit;
28
29 /* ensure that @mep->fifo_seg_size is power of two */
30 num_bits = roundup_pow_of_two(num_bits);
31 if (num_bits > fifo->limit)
32 return -EINVAL;
33
34 mep->fifo_seg_size = num_bits * MTU3_EP_FIFO_UNIT;
35 num_bits = num_bits * (mep->slot + 1);
36 start_bit = bitmap_find_next_zero_area(map: fifo->bitmap,
37 size: fifo->limit, start: 0, nr: num_bits, align_mask: 0);
38 if (start_bit >= fifo->limit)
39 return -EOVERFLOW;
40
41 bitmap_set(map: fifo->bitmap, start: start_bit, nbits: num_bits);
42 mep->fifo_size = num_bits * MTU3_EP_FIFO_UNIT;
43 mep->fifo_addr = fifo->base + MTU3_EP_FIFO_UNIT * start_bit;
44
45 dev_dbg(mep->mtu->dev, "%s fifo:%#x/%#x, start_bit: %d\n",
46 __func__, mep->fifo_seg_size, mep->fifo_size, start_bit);
47
48 return mep->fifo_addr;
49}
50
51static void ep_fifo_free(struct mtu3_ep *mep)
52{
53 struct mtu3_fifo_info *fifo = mep->fifo;
54 u32 addr = mep->fifo_addr;
55 u32 bits = mep->fifo_size / MTU3_EP_FIFO_UNIT;
56 u32 start_bit;
57
58 if (unlikely(addr < fifo->base || bits > fifo->limit))
59 return;
60
61 start_bit = (addr - fifo->base) / MTU3_EP_FIFO_UNIT;
62 bitmap_clear(map: fifo->bitmap, start: start_bit, nbits: bits);
63 mep->fifo_size = 0;
64 mep->fifo_seg_size = 0;
65
66 dev_dbg(mep->mtu->dev, "%s size:%#x/%#x, start_bit: %d\n",
67 __func__, mep->fifo_seg_size, mep->fifo_size, start_bit);
68}
69
70/* enable/disable U3D SS function */
71static inline void mtu3_ss_func_set(struct mtu3 *mtu, bool enable)
72{
73 /* If usb3_en==0, LTSSM will go to SS.Disable state */
74 if (enable)
75 mtu3_setbits(base: mtu->mac_base, U3D_USB3_CONFIG, USB3_EN);
76 else
77 mtu3_clrbits(base: mtu->mac_base, U3D_USB3_CONFIG, USB3_EN);
78
79 dev_dbg(mtu->dev, "USB3_EN = %d\n", !!enable);
80}
81
82/* set/clear U3D HS device soft connect */
83static inline void mtu3_hs_softconn_set(struct mtu3 *mtu, bool enable)
84{
85 if (enable) {
86 mtu3_setbits(base: mtu->mac_base, U3D_POWER_MANAGEMENT,
87 SOFT_CONN | SUSPENDM_ENABLE);
88 } else {
89 mtu3_clrbits(base: mtu->mac_base, U3D_POWER_MANAGEMENT,
90 SOFT_CONN | SUSPENDM_ENABLE);
91 }
92 dev_dbg(mtu->dev, "SOFTCONN = %d\n", !!enable);
93}
94
95/* only port0 of U2/U3 supports device mode */
96static int mtu3_device_enable(struct mtu3 *mtu)
97{
98 void __iomem *ibase = mtu->ippc_base;
99 u32 check_clk = 0;
100
101 mtu3_clrbits(base: ibase, U3D_SSUSB_IP_PW_CTRL2, SSUSB_IP_DEV_PDN);
102
103 if (mtu->u3_capable) {
104 check_clk = SSUSB_U3_MAC_RST_B_STS;
105 mtu3_clrbits(base: ibase, SSUSB_U3_CTRL(0),
106 bits: (SSUSB_U3_PORT_DIS | SSUSB_U3_PORT_PDN |
107 SSUSB_U3_PORT_HOST_SEL));
108 }
109 mtu3_clrbits(base: ibase, SSUSB_U2_CTRL(0),
110 bits: (SSUSB_U2_PORT_DIS | SSUSB_U2_PORT_PDN |
111 SSUSB_U2_PORT_HOST_SEL));
112
113 if (mtu->ssusb->dr_mode == USB_DR_MODE_OTG) {
114 mtu3_setbits(base: ibase, SSUSB_U2_CTRL(0), SSUSB_U2_PORT_OTG_SEL);
115 if (mtu->u3_capable)
116 mtu3_setbits(base: ibase, SSUSB_U3_CTRL(0),
117 SSUSB_U3_PORT_DUAL_MODE);
118 }
119
120 return ssusb_check_clocks(ssusb: mtu->ssusb, ex_clks: check_clk);
121}
122
123static void mtu3_device_disable(struct mtu3 *mtu)
124{
125 void __iomem *ibase = mtu->ippc_base;
126
127 if (mtu->u3_capable)
128 mtu3_setbits(base: ibase, SSUSB_U3_CTRL(0),
129 bits: (SSUSB_U3_PORT_DIS | SSUSB_U3_PORT_PDN));
130
131 mtu3_setbits(base: ibase, SSUSB_U2_CTRL(0),
132 SSUSB_U2_PORT_DIS | SSUSB_U2_PORT_PDN);
133
134 if (mtu->ssusb->dr_mode == USB_DR_MODE_OTG) {
135 mtu3_clrbits(base: ibase, SSUSB_U2_CTRL(0), SSUSB_U2_PORT_OTG_SEL);
136 if (mtu->u3_capable)
137 mtu3_clrbits(base: ibase, SSUSB_U3_CTRL(0),
138 SSUSB_U3_PORT_DUAL_MODE);
139 }
140
141 mtu3_setbits(base: ibase, U3D_SSUSB_IP_PW_CTRL2, SSUSB_IP_DEV_PDN);
142}
143
144static void mtu3_dev_power_on(struct mtu3 *mtu)
145{
146 void __iomem *ibase = mtu->ippc_base;
147
148 mtu3_clrbits(base: ibase, U3D_SSUSB_IP_PW_CTRL2, SSUSB_IP_DEV_PDN);
149 if (mtu->u3_capable)
150 mtu3_clrbits(base: ibase, SSUSB_U3_CTRL(0), SSUSB_U3_PORT_PDN);
151
152 mtu3_clrbits(base: ibase, SSUSB_U2_CTRL(0), SSUSB_U2_PORT_PDN);
153}
154
155static void mtu3_dev_power_down(struct mtu3 *mtu)
156{
157 void __iomem *ibase = mtu->ippc_base;
158
159 if (mtu->u3_capable)
160 mtu3_setbits(base: ibase, SSUSB_U3_CTRL(0), SSUSB_U3_PORT_PDN);
161
162 mtu3_setbits(base: ibase, SSUSB_U2_CTRL(0), SSUSB_U2_PORT_PDN);
163 mtu3_setbits(base: ibase, U3D_SSUSB_IP_PW_CTRL2, SSUSB_IP_DEV_PDN);
164}
165
166/* reset U3D's device module. */
167static void mtu3_device_reset(struct mtu3 *mtu)
168{
169 void __iomem *ibase = mtu->ippc_base;
170
171 mtu3_setbits(base: ibase, U3D_SSUSB_DEV_RST_CTRL, SSUSB_DEV_SW_RST);
172 udelay(usec: 1);
173 mtu3_clrbits(base: ibase, U3D_SSUSB_DEV_RST_CTRL, SSUSB_DEV_SW_RST);
174}
175
176static void mtu3_intr_status_clear(struct mtu3 *mtu)
177{
178 void __iomem *mbase = mtu->mac_base;
179
180 /* Clear EP0 and Tx/Rx EPn interrupts status */
181 mtu3_writel(base: mbase, U3D_EPISR, data: ~0x0);
182 /* Clear U2 USB common interrupts status */
183 mtu3_writel(base: mbase, U3D_COMMON_USB_INTR, data: ~0x0);
184 /* Clear U3 LTSSM interrupts status */
185 mtu3_writel(base: mbase, U3D_LTSSM_INTR, data: ~0x0);
186 /* Clear speed change interrupt status */
187 mtu3_writel(base: mbase, U3D_DEV_LINK_INTR, data: ~0x0);
188 /* Clear QMU interrupt status */
189 mtu3_writel(base: mbase, U3D_QISAR0, data: ~0x0);
190}
191
192/* disable all interrupts */
193static void mtu3_intr_disable(struct mtu3 *mtu)
194{
195 /* Disable level 1 interrupts */
196 mtu3_writel(base: mtu->mac_base, U3D_LV1IECR, data: ~0x0);
197 /* Disable endpoint interrupts */
198 mtu3_writel(base: mtu->mac_base, U3D_EPIECR, data: ~0x0);
199 mtu3_intr_status_clear(mtu);
200}
201
202/* enable system global interrupt */
203static void mtu3_intr_enable(struct mtu3 *mtu)
204{
205 void __iomem *mbase = mtu->mac_base;
206 u32 value;
207
208 /*Enable level 1 interrupts (BMU, QMU, MAC3, DMA, MAC2, EPCTL) */
209 value = BMU_INTR | QMU_INTR | MAC3_INTR | MAC2_INTR | EP_CTRL_INTR;
210 mtu3_writel(base: mbase, U3D_LV1IESR, data: value);
211
212 /* Enable U2 common USB interrupts */
213 value = SUSPEND_INTR | RESUME_INTR | RESET_INTR;
214 mtu3_writel(base: mbase, U3D_COMMON_USB_INTR_ENABLE, data: value);
215
216 if (mtu->u3_capable) {
217 /* Enable U3 LTSSM interrupts */
218 value = HOT_RST_INTR | WARM_RST_INTR |
219 ENTER_U3_INTR | EXIT_U3_INTR;
220 mtu3_writel(base: mbase, U3D_LTSSM_INTR_ENABLE, data: value);
221 }
222
223 /* Enable QMU interrupts. */
224 value = TXQ_CSERR_INT | TXQ_LENERR_INT | RXQ_CSERR_INT |
225 RXQ_LENERR_INT | RXQ_ZLPERR_INT;
226 mtu3_writel(base: mbase, U3D_QIESR1, data: value);
227
228 /* Enable speed change interrupt */
229 mtu3_writel(base: mbase, U3D_DEV_LINK_INTR_ENABLE, SSUSB_DEV_SPEED_CHG_INTR);
230}
231
232static void mtu3_set_speed(struct mtu3 *mtu, enum usb_device_speed speed)
233{
234 void __iomem *mbase = mtu->mac_base;
235
236 if (speed > mtu->max_speed)
237 speed = mtu->max_speed;
238
239 switch (speed) {
240 case USB_SPEED_FULL:
241 /* disable U3 SS function */
242 mtu3_clrbits(base: mbase, U3D_USB3_CONFIG, USB3_EN);
243 /* disable HS function */
244 mtu3_clrbits(base: mbase, U3D_POWER_MANAGEMENT, HS_ENABLE);
245 break;
246 case USB_SPEED_HIGH:
247 mtu3_clrbits(base: mbase, U3D_USB3_CONFIG, USB3_EN);
248 /* HS/FS detected by HW */
249 mtu3_setbits(base: mbase, U3D_POWER_MANAGEMENT, HS_ENABLE);
250 break;
251 case USB_SPEED_SUPER:
252 mtu3_setbits(base: mbase, U3D_POWER_MANAGEMENT, HS_ENABLE);
253 mtu3_clrbits(base: mtu->ippc_base, SSUSB_U3_CTRL(0),
254 SSUSB_U3_PORT_SSP_SPEED);
255 break;
256 case USB_SPEED_SUPER_PLUS:
257 mtu3_setbits(base: mbase, U3D_POWER_MANAGEMENT, HS_ENABLE);
258 mtu3_setbits(base: mtu->ippc_base, SSUSB_U3_CTRL(0),
259 SSUSB_U3_PORT_SSP_SPEED);
260 break;
261 default:
262 dev_err(mtu->dev, "invalid speed: %s\n",
263 usb_speed_string(speed));
264 return;
265 }
266
267 mtu->speed = speed;
268 dev_dbg(mtu->dev, "set speed: %s\n", usb_speed_string(speed));
269}
270
271/* CSR registers will be reset to default value if port is disabled */
272static void mtu3_csr_init(struct mtu3 *mtu)
273{
274 void __iomem *mbase = mtu->mac_base;
275
276 if (mtu->u3_capable) {
277 /* disable LGO_U1/U2 by default */
278 mtu3_clrbits(base: mbase, U3D_LINK_POWER_CONTROL,
279 SW_U1_REQUEST_ENABLE | SW_U2_REQUEST_ENABLE);
280 /* enable accept LGO_U1/U2 link command from host */
281 mtu3_setbits(base: mbase, U3D_LINK_POWER_CONTROL,
282 SW_U1_ACCEPT_ENABLE | SW_U2_ACCEPT_ENABLE);
283 /* device responses to u3_exit from host automatically */
284 mtu3_clrbits(base: mbase, U3D_LTSSM_CTRL, SOFT_U3_EXIT_EN);
285 /* automatically build U2 link when U3 detect fail */
286 mtu3_setbits(base: mbase, U3D_USB2_TEST_MODE, U2U3_AUTO_SWITCH);
287 /* auto clear SOFT_CONN when clear USB3_EN if work as HS */
288 mtu3_setbits(base: mbase, U3D_U3U2_SWITCH_CTRL, SOFTCON_CLR_AUTO_EN);
289 }
290
291 /* delay about 0.1us from detecting reset to send chirp-K */
292 mtu3_clrbits(base: mbase, U3D_LINK_RESET_INFO, WTCHRP_MSK);
293 /* enable automatical HWRW from L1 */
294 mtu3_setbits(base: mbase, U3D_POWER_MANAGEMENT, LPM_HRWE);
295}
296
297/* reset: u2 - data toggle, u3 - SeqN, flow control status etc */
298static void mtu3_ep_reset(struct mtu3_ep *mep)
299{
300 struct mtu3 *mtu = mep->mtu;
301 u32 rst_bit = EP_RST(mep->is_in, mep->epnum);
302
303 mtu3_setbits(base: mtu->mac_base, U3D_EP_RST, bits: rst_bit);
304 mtu3_clrbits(base: mtu->mac_base, U3D_EP_RST, bits: rst_bit);
305}
306
307/* set/clear the stall and toggle bits for non-ep0 */
308void mtu3_ep_stall_set(struct mtu3_ep *mep, bool set)
309{
310 struct mtu3 *mtu = mep->mtu;
311 void __iomem *mbase = mtu->mac_base;
312 u8 epnum = mep->epnum;
313 u32 csr;
314
315 if (mep->is_in) { /* TX */
316 csr = mtu3_readl(base: mbase, MU3D_EP_TXCR0(epnum)) & TX_W1C_BITS;
317 if (set)
318 csr |= TX_SENDSTALL;
319 else
320 csr = (csr & (~TX_SENDSTALL)) | TX_SENTSTALL;
321 mtu3_writel(base: mbase, MU3D_EP_TXCR0(epnum), data: csr);
322 } else { /* RX */
323 csr = mtu3_readl(base: mbase, MU3D_EP_RXCR0(epnum)) & RX_W1C_BITS;
324 if (set)
325 csr |= RX_SENDSTALL;
326 else
327 csr = (csr & (~RX_SENDSTALL)) | RX_SENTSTALL;
328 mtu3_writel(base: mbase, MU3D_EP_RXCR0(epnum), data: csr);
329 }
330
331 if (!set) {
332 mtu3_ep_reset(mep);
333 mep->flags &= ~MTU3_EP_STALL;
334 } else {
335 mep->flags |= MTU3_EP_STALL;
336 }
337
338 dev_dbg(mtu->dev, "%s: %s\n", mep->name,
339 set ? "SEND STALL" : "CLEAR STALL, with EP RESET");
340}
341
342void mtu3_dev_on_off(struct mtu3 *mtu, int is_on)
343{
344 if (mtu->u3_capable && mtu->speed >= USB_SPEED_SUPER)
345 mtu3_ss_func_set(mtu, enable: is_on);
346 else
347 mtu3_hs_softconn_set(mtu, enable: is_on);
348
349 dev_info(mtu->dev, "gadget (%s) pullup D%s\n",
350 usb_speed_string(mtu->speed), is_on ? "+" : "-");
351}
352
353void mtu3_start(struct mtu3 *mtu)
354{
355 void __iomem *mbase = mtu->mac_base;
356
357 dev_dbg(mtu->dev, "%s devctl 0x%x\n", __func__,
358 mtu3_readl(mbase, U3D_DEVICE_CONTROL));
359
360 mtu3_dev_power_on(mtu);
361 mtu3_csr_init(mtu);
362 mtu3_set_speed(mtu, speed: mtu->speed);
363
364 /* Initialize the default interrupts */
365 mtu3_intr_enable(mtu);
366 mtu->is_active = 1;
367
368 if (mtu->softconnect)
369 mtu3_dev_on_off(mtu, is_on: 1);
370}
371
372void mtu3_stop(struct mtu3 *mtu)
373{
374 dev_dbg(mtu->dev, "%s\n", __func__);
375
376 mtu3_intr_disable(mtu);
377
378 if (mtu->softconnect)
379 mtu3_dev_on_off(mtu, is_on: 0);
380
381 mtu->is_active = 0;
382 mtu3_dev_power_down(mtu);
383}
384
385static void mtu3_dev_suspend(struct mtu3 *mtu)
386{
387 if (!mtu->is_active)
388 return;
389
390 mtu3_intr_disable(mtu);
391 mtu3_dev_power_down(mtu);
392}
393
394static void mtu3_dev_resume(struct mtu3 *mtu)
395{
396 if (!mtu->is_active)
397 return;
398
399 mtu3_dev_power_on(mtu);
400 mtu3_intr_enable(mtu);
401}
402
403/* for non-ep0 */
404int mtu3_config_ep(struct mtu3 *mtu, struct mtu3_ep *mep,
405 int interval, int burst, int mult)
406{
407 void __iomem *mbase = mtu->mac_base;
408 bool gen2cp = mtu->gen2cp;
409 int epnum = mep->epnum;
410 u32 csr0, csr1, csr2;
411 int fifo_sgsz, fifo_addr;
412 int num_pkts;
413
414 fifo_addr = ep_fifo_alloc(mep, seg_size: mep->maxp);
415 if (fifo_addr < 0) {
416 dev_err(mtu->dev, "alloc ep fifo failed(%d)\n", mep->maxp);
417 return -ENOMEM;
418 }
419 fifo_sgsz = ilog2(mep->fifo_seg_size);
420 dev_dbg(mtu->dev, "%s fifosz: %x(%x/%x)\n", __func__, fifo_sgsz,
421 mep->fifo_seg_size, mep->fifo_size);
422
423 if (mep->is_in) {
424 csr0 = TX_TXMAXPKTSZ(mep->maxp);
425 csr0 |= TX_DMAREQEN;
426
427 num_pkts = (burst + 1) * (mult + 1) - 1;
428 csr1 = TX_SS_BURST(burst) | TX_SLOT(mep->slot);
429 csr1 |= TX_MAX_PKT(gen2cp, num_pkts) | TX_MULT(gen2cp, mult);
430
431 csr2 = TX_FIFOADDR(fifo_addr >> 4);
432 csr2 |= TX_FIFOSEGSIZE(fifo_sgsz);
433
434 switch (mep->type) {
435 case USB_ENDPOINT_XFER_BULK:
436 csr1 |= TX_TYPE(TYPE_BULK);
437 break;
438 case USB_ENDPOINT_XFER_ISOC:
439 csr1 |= TX_TYPE(TYPE_ISO);
440 csr2 |= TX_BINTERVAL(interval);
441 break;
442 case USB_ENDPOINT_XFER_INT:
443 csr1 |= TX_TYPE(TYPE_INT);
444 csr2 |= TX_BINTERVAL(interval);
445 break;
446 }
447
448 /* Enable QMU Done interrupt */
449 mtu3_setbits(base: mbase, U3D_QIESR0, QMU_TX_DONE_INT(epnum));
450
451 mtu3_writel(base: mbase, MU3D_EP_TXCR0(epnum), data: csr0);
452 mtu3_writel(base: mbase, MU3D_EP_TXCR1(epnum), data: csr1);
453 mtu3_writel(base: mbase, MU3D_EP_TXCR2(epnum), data: csr2);
454
455 dev_dbg(mtu->dev, "U3D_TX%d CSR0:%#x, CSR1:%#x, CSR2:%#x\n",
456 epnum, mtu3_readl(mbase, MU3D_EP_TXCR0(epnum)),
457 mtu3_readl(mbase, MU3D_EP_TXCR1(epnum)),
458 mtu3_readl(mbase, MU3D_EP_TXCR2(epnum)));
459 } else {
460 csr0 = RX_RXMAXPKTSZ(mep->maxp);
461 csr0 |= RX_DMAREQEN;
462
463 num_pkts = (burst + 1) * (mult + 1) - 1;
464 csr1 = RX_SS_BURST(burst) | RX_SLOT(mep->slot);
465 csr1 |= RX_MAX_PKT(gen2cp, num_pkts) | RX_MULT(gen2cp, mult);
466
467 csr2 = RX_FIFOADDR(fifo_addr >> 4);
468 csr2 |= RX_FIFOSEGSIZE(fifo_sgsz);
469
470 switch (mep->type) {
471 case USB_ENDPOINT_XFER_BULK:
472 csr1 |= RX_TYPE(TYPE_BULK);
473 break;
474 case USB_ENDPOINT_XFER_ISOC:
475 csr1 |= RX_TYPE(TYPE_ISO);
476 csr2 |= RX_BINTERVAL(interval);
477 break;
478 case USB_ENDPOINT_XFER_INT:
479 csr1 |= RX_TYPE(TYPE_INT);
480 csr2 |= RX_BINTERVAL(interval);
481 break;
482 }
483
484 /*Enable QMU Done interrupt */
485 mtu3_setbits(base: mbase, U3D_QIESR0, QMU_RX_DONE_INT(epnum));
486
487 mtu3_writel(base: mbase, MU3D_EP_RXCR0(epnum), data: csr0);
488 mtu3_writel(base: mbase, MU3D_EP_RXCR1(epnum), data: csr1);
489 mtu3_writel(base: mbase, MU3D_EP_RXCR2(epnum), data: csr2);
490
491 dev_dbg(mtu->dev, "U3D_RX%d CSR0:%#x, CSR1:%#x, CSR2:%#x\n",
492 epnum, mtu3_readl(mbase, MU3D_EP_RXCR0(epnum)),
493 mtu3_readl(mbase, MU3D_EP_RXCR1(epnum)),
494 mtu3_readl(mbase, MU3D_EP_RXCR2(epnum)));
495 }
496
497 dev_dbg(mtu->dev, "csr0:%#x, csr1:%#x, csr2:%#x\n", csr0, csr1, csr2);
498 dev_dbg(mtu->dev, "%s: %s, fifo-addr:%#x, fifo-size:%#x(%#x/%#x)\n",
499 __func__, mep->name, mep->fifo_addr, mep->fifo_size,
500 fifo_sgsz, mep->fifo_seg_size);
501
502 return 0;
503}
504
505/* for non-ep0 */
506void mtu3_deconfig_ep(struct mtu3 *mtu, struct mtu3_ep *mep)
507{
508 void __iomem *mbase = mtu->mac_base;
509 int epnum = mep->epnum;
510
511 if (mep->is_in) {
512 mtu3_writel(base: mbase, MU3D_EP_TXCR0(epnum), data: 0);
513 mtu3_writel(base: mbase, MU3D_EP_TXCR1(epnum), data: 0);
514 mtu3_writel(base: mbase, MU3D_EP_TXCR2(epnum), data: 0);
515 mtu3_setbits(base: mbase, U3D_QIECR0, QMU_TX_DONE_INT(epnum));
516 } else {
517 mtu3_writel(base: mbase, MU3D_EP_RXCR0(epnum), data: 0);
518 mtu3_writel(base: mbase, MU3D_EP_RXCR1(epnum), data: 0);
519 mtu3_writel(base: mbase, MU3D_EP_RXCR2(epnum), data: 0);
520 mtu3_setbits(base: mbase, U3D_QIECR0, QMU_RX_DONE_INT(epnum));
521 }
522
523 mtu3_ep_reset(mep);
524 ep_fifo_free(mep);
525
526 dev_dbg(mtu->dev, "%s: %s\n", __func__, mep->name);
527}
528
529/*
530 * Two scenarios:
531 * 1. when device IP supports SS, the fifo of EP0, TX EPs, RX EPs
532 * are separated;
533 * 2. when supports only HS, the fifo is shared for all EPs, and
534 * the capability registers of @EPNTXFFSZ or @EPNRXFFSZ indicate
535 * the total fifo size of non-ep0, and ep0's is fixed to 64B,
536 * so the total fifo size is 64B + @EPNTXFFSZ;
537 * Due to the first 64B should be reserved for EP0, non-ep0's fifo
538 * starts from offset 64 and are divided into two equal parts for
539 * TX or RX EPs for simplification.
540 */
541static void get_ep_fifo_config(struct mtu3 *mtu)
542{
543 struct mtu3_fifo_info *tx_fifo;
544 struct mtu3_fifo_info *rx_fifo;
545 u32 fifosize;
546
547 if (mtu->separate_fifo) {
548 fifosize = mtu3_readl(base: mtu->mac_base, U3D_CAP_EPNTXFFSZ);
549 tx_fifo = &mtu->tx_fifo;
550 tx_fifo->base = 0;
551 tx_fifo->limit = fifosize / MTU3_EP_FIFO_UNIT;
552 bitmap_zero(dst: tx_fifo->bitmap, MTU3_FIFO_BIT_SIZE);
553
554 fifosize = mtu3_readl(base: mtu->mac_base, U3D_CAP_EPNRXFFSZ);
555 rx_fifo = &mtu->rx_fifo;
556 rx_fifo->base = 0;
557 rx_fifo->limit = fifosize / MTU3_EP_FIFO_UNIT;
558 bitmap_zero(dst: rx_fifo->bitmap, MTU3_FIFO_BIT_SIZE);
559 mtu->slot = MTU3_U3_IP_SLOT_DEFAULT;
560 } else {
561 fifosize = mtu3_readl(base: mtu->mac_base, U3D_CAP_EPNTXFFSZ);
562 tx_fifo = &mtu->tx_fifo;
563 tx_fifo->base = MTU3_U2_IP_EP0_FIFO_SIZE;
564 tx_fifo->limit = (fifosize / MTU3_EP_FIFO_UNIT) >> 1;
565 bitmap_zero(dst: tx_fifo->bitmap, MTU3_FIFO_BIT_SIZE);
566
567 rx_fifo = &mtu->rx_fifo;
568 rx_fifo->base =
569 tx_fifo->base + tx_fifo->limit * MTU3_EP_FIFO_UNIT;
570 rx_fifo->limit = tx_fifo->limit;
571 bitmap_zero(dst: rx_fifo->bitmap, MTU3_FIFO_BIT_SIZE);
572 mtu->slot = MTU3_U2_IP_SLOT_DEFAULT;
573 }
574
575 dev_dbg(mtu->dev, "%s, TX: base-%d, limit-%d; RX: base-%d, limit-%d\n",
576 __func__, tx_fifo->base, tx_fifo->limit,
577 rx_fifo->base, rx_fifo->limit);
578}
579
580static void mtu3_ep0_setup(struct mtu3 *mtu)
581{
582 u32 maxpacket = mtu->g.ep0->maxpacket;
583 u32 csr;
584
585 dev_dbg(mtu->dev, "%s maxpacket: %d\n", __func__, maxpacket);
586
587 csr = mtu3_readl(base: mtu->mac_base, U3D_EP0CSR);
588 csr &= ~EP0_MAXPKTSZ_MSK;
589 csr |= EP0_MAXPKTSZ(maxpacket);
590 csr &= EP0_W1C_BITS;
591 mtu3_writel(base: mtu->mac_base, U3D_EP0CSR, data: csr);
592
593 /* Enable EP0 interrupt */
594 mtu3_writel(base: mtu->mac_base, U3D_EPIESR, EP0ISR | SETUPENDISR);
595}
596
597static int mtu3_mem_alloc(struct mtu3 *mtu)
598{
599 void __iomem *mbase = mtu->mac_base;
600 struct mtu3_ep *ep_array;
601 int in_ep_num, out_ep_num;
602 u32 cap_epinfo;
603 int ret;
604 int i;
605
606 cap_epinfo = mtu3_readl(base: mbase, U3D_CAP_EPINFO);
607 in_ep_num = CAP_TX_EP_NUM(cap_epinfo);
608 out_ep_num = CAP_RX_EP_NUM(cap_epinfo);
609
610 dev_info(mtu->dev, "fifosz/epnum: Tx=%#x/%d, Rx=%#x/%d\n",
611 mtu3_readl(mbase, U3D_CAP_EPNTXFFSZ), in_ep_num,
612 mtu3_readl(mbase, U3D_CAP_EPNRXFFSZ), out_ep_num);
613
614 /* one for ep0, another is reserved */
615 mtu->num_eps = min(in_ep_num, out_ep_num) + 1;
616 ep_array = kcalloc(mtu->num_eps * 2, sizeof(*ep_array), GFP_KERNEL);
617 if (ep_array == NULL)
618 return -ENOMEM;
619
620 mtu->ep_array = ep_array;
621 mtu->in_eps = ep_array;
622 mtu->out_eps = &ep_array[mtu->num_eps];
623 /* ep0 uses in_eps[0], out_eps[0] is reserved */
624 mtu->ep0 = mtu->in_eps;
625 mtu->ep0->mtu = mtu;
626 mtu->ep0->epnum = 0;
627
628 for (i = 1; i < mtu->num_eps; i++) {
629 struct mtu3_ep *mep = mtu->in_eps + i;
630
631 mep->fifo = &mtu->tx_fifo;
632 mep = mtu->out_eps + i;
633 mep->fifo = &mtu->rx_fifo;
634 }
635
636 get_ep_fifo_config(mtu);
637
638 ret = mtu3_qmu_init(mtu);
639 if (ret)
640 kfree(objp: mtu->ep_array);
641
642 return ret;
643}
644
645static void mtu3_mem_free(struct mtu3 *mtu)
646{
647 mtu3_qmu_exit(mtu);
648 kfree(objp: mtu->ep_array);
649}
650
651static void mtu3_regs_init(struct mtu3 *mtu)
652{
653 void __iomem *mbase = mtu->mac_base;
654
655 /* be sure interrupts are disabled before registration of ISR */
656 mtu3_intr_disable(mtu);
657
658 mtu3_csr_init(mtu);
659
660 /* U2/U3 detected by HW */
661 mtu3_writel(base: mbase, U3D_DEVICE_CONF, data: 0);
662 /* vbus detected by HW */
663 mtu3_clrbits(base: mbase, U3D_MISC_CTRL, VBUS_FRC_EN | VBUS_ON);
664 /* use new QMU format when HW version >= 0x1003 */
665 if (mtu->gen2cp)
666 mtu3_writel(base: mbase, U3D_QFCR, data: ~0x0);
667}
668
669static irqreturn_t mtu3_link_isr(struct mtu3 *mtu)
670{
671 void __iomem *mbase = mtu->mac_base;
672 enum usb_device_speed udev_speed;
673 u32 maxpkt = 64;
674 u32 link;
675 u32 speed;
676
677 link = mtu3_readl(base: mbase, U3D_DEV_LINK_INTR);
678 link &= mtu3_readl(base: mbase, U3D_DEV_LINK_INTR_ENABLE);
679 mtu3_writel(base: mbase, U3D_DEV_LINK_INTR, data: link); /* W1C */
680 dev_dbg(mtu->dev, "=== LINK[%x] ===\n", link);
681
682 if (!(link & SSUSB_DEV_SPEED_CHG_INTR))
683 return IRQ_NONE;
684
685 speed = SSUSB_DEV_SPEED(mtu3_readl(mbase, U3D_DEVICE_CONF));
686
687 switch (speed) {
688 case MTU3_SPEED_FULL:
689 udev_speed = USB_SPEED_FULL;
690 /*BESLCK = 4 < BESLCK_U3 = 10 < BESLDCK = 15 */
691 mtu3_writel(base: mbase, U3D_USB20_LPM_PARAMETER, LPM_BESLDCK(0xf)
692 | LPM_BESLCK(4) | LPM_BESLCK_U3(0xa));
693 mtu3_setbits(base: mbase, U3D_POWER_MANAGEMENT,
694 LPM_BESL_STALL | LPM_BESLD_STALL);
695 break;
696 case MTU3_SPEED_HIGH:
697 udev_speed = USB_SPEED_HIGH;
698 /*BESLCK = 4 < BESLCK_U3 = 10 < BESLDCK = 15 */
699 mtu3_writel(base: mbase, U3D_USB20_LPM_PARAMETER, LPM_BESLDCK(0xf)
700 | LPM_BESLCK(4) | LPM_BESLCK_U3(0xa));
701 mtu3_setbits(base: mbase, U3D_POWER_MANAGEMENT,
702 LPM_BESL_STALL | LPM_BESLD_STALL);
703 break;
704 case MTU3_SPEED_SUPER:
705 udev_speed = USB_SPEED_SUPER;
706 maxpkt = 512;
707 break;
708 case MTU3_SPEED_SUPER_PLUS:
709 udev_speed = USB_SPEED_SUPER_PLUS;
710 maxpkt = 512;
711 break;
712 default:
713 udev_speed = USB_SPEED_UNKNOWN;
714 break;
715 }
716 dev_dbg(mtu->dev, "%s: %s\n", __func__, usb_speed_string(udev_speed));
717 mtu3_dbg_trace(dev: mtu->dev, fmt: "link speed %s",
718 usb_speed_string(speed: udev_speed));
719
720 mtu->g.speed = udev_speed;
721 mtu->g.ep0->maxpacket = maxpkt;
722 mtu->ep0_state = MU3D_EP0_STATE_SETUP;
723 mtu->connected = !!(udev_speed != USB_SPEED_UNKNOWN);
724
725 if (udev_speed == USB_SPEED_UNKNOWN) {
726 mtu3_gadget_disconnect(mtu);
727 pm_runtime_put(dev: mtu->dev);
728 } else {
729 pm_runtime_get(dev: mtu->dev);
730 mtu3_ep0_setup(mtu);
731 }
732
733 return IRQ_HANDLED;
734}
735
736static irqreturn_t mtu3_u3_ltssm_isr(struct mtu3 *mtu)
737{
738 void __iomem *mbase = mtu->mac_base;
739 u32 ltssm;
740
741 ltssm = mtu3_readl(base: mbase, U3D_LTSSM_INTR);
742 ltssm &= mtu3_readl(base: mbase, U3D_LTSSM_INTR_ENABLE);
743 mtu3_writel(base: mbase, U3D_LTSSM_INTR, data: ltssm); /* W1C */
744 dev_dbg(mtu->dev, "=== LTSSM[%x] ===\n", ltssm);
745 trace_mtu3_u3_ltssm_isr(intr: ltssm);
746
747 if (ltssm & (HOT_RST_INTR | WARM_RST_INTR))
748 mtu3_gadget_reset(mtu);
749
750 if (ltssm & VBUS_FALL_INTR) {
751 mtu3_ss_func_set(mtu, enable: false);
752 mtu3_gadget_reset(mtu);
753 }
754
755 if (ltssm & VBUS_RISE_INTR)
756 mtu3_ss_func_set(mtu, enable: true);
757
758 if (ltssm & EXIT_U3_INTR)
759 mtu3_gadget_resume(mtu);
760
761 if (ltssm & ENTER_U3_INTR)
762 mtu3_gadget_suspend(mtu);
763
764 return IRQ_HANDLED;
765}
766
767static irqreturn_t mtu3_u2_common_isr(struct mtu3 *mtu)
768{
769 void __iomem *mbase = mtu->mac_base;
770 u32 u2comm;
771
772 u2comm = mtu3_readl(base: mbase, U3D_COMMON_USB_INTR);
773 u2comm &= mtu3_readl(base: mbase, U3D_COMMON_USB_INTR_ENABLE);
774 mtu3_writel(base: mbase, U3D_COMMON_USB_INTR, data: u2comm); /* W1C */
775 dev_dbg(mtu->dev, "=== U2COMM[%x] ===\n", u2comm);
776 trace_mtu3_u2_common_isr(intr: u2comm);
777
778 if (u2comm & SUSPEND_INTR)
779 mtu3_gadget_suspend(mtu);
780
781 if (u2comm & RESUME_INTR)
782 mtu3_gadget_resume(mtu);
783
784 if (u2comm & RESET_INTR)
785 mtu3_gadget_reset(mtu);
786
787 return IRQ_HANDLED;
788}
789
790static irqreturn_t mtu3_irq(int irq, void *data)
791{
792 struct mtu3 *mtu = (struct mtu3 *)data;
793 unsigned long flags;
794 u32 level1;
795
796 spin_lock_irqsave(&mtu->lock, flags);
797
798 /* U3D_LV1ISR is RU */
799 level1 = mtu3_readl(base: mtu->mac_base, U3D_LV1ISR);
800 level1 &= mtu3_readl(base: mtu->mac_base, U3D_LV1IER);
801
802 if (level1 & EP_CTRL_INTR)
803 mtu3_link_isr(mtu);
804
805 if (level1 & MAC2_INTR)
806 mtu3_u2_common_isr(mtu);
807
808 if (level1 & MAC3_INTR)
809 mtu3_u3_ltssm_isr(mtu);
810
811 if (level1 & BMU_INTR)
812 mtu3_ep0_isr(mtu);
813
814 if (level1 & QMU_INTR)
815 mtu3_qmu_isr(mtu);
816
817 spin_unlock_irqrestore(lock: &mtu->lock, flags);
818
819 return IRQ_HANDLED;
820}
821
822static void mtu3_check_params(struct mtu3 *mtu)
823{
824 /* device's u3 port (port0) is disabled */
825 if (mtu->u3_capable && (mtu->ssusb->u3p_dis_msk & BIT(0)))
826 mtu->u3_capable = 0;
827
828 /* check the max_speed parameter */
829 switch (mtu->max_speed) {
830 case USB_SPEED_FULL:
831 case USB_SPEED_HIGH:
832 case USB_SPEED_SUPER:
833 case USB_SPEED_SUPER_PLUS:
834 break;
835 default:
836 dev_err(mtu->dev, "invalid max_speed: %s\n",
837 usb_speed_string(mtu->max_speed));
838 fallthrough;
839 case USB_SPEED_UNKNOWN:
840 /* default as SSP */
841 mtu->max_speed = USB_SPEED_SUPER_PLUS;
842 break;
843 }
844
845 if (!mtu->u3_capable && (mtu->max_speed > USB_SPEED_HIGH))
846 mtu->max_speed = USB_SPEED_HIGH;
847
848 mtu->speed = mtu->max_speed;
849
850 dev_info(mtu->dev, "max_speed: %s\n",
851 usb_speed_string(mtu->max_speed));
852}
853
854static int mtu3_hw_init(struct mtu3 *mtu)
855{
856 u32 value;
857 int ret;
858
859 value = mtu3_readl(base: mtu->ippc_base, U3D_SSUSB_IP_TRUNK_VERS);
860 mtu->hw_version = IP_TRUNK_VERS(value);
861 mtu->gen2cp = !!(mtu->hw_version >= MTU3_TRUNK_VERS_1003);
862
863 value = mtu3_readl(base: mtu->ippc_base, U3D_SSUSB_IP_DEV_CAP);
864 mtu->u3_capable = !!SSUSB_IP_DEV_U3_PORT_NUM(value);
865 /* usb3 ip uses separate fifo */
866 mtu->separate_fifo = mtu->u3_capable;
867
868 dev_info(mtu->dev, "IP version 0x%x(%s IP)\n", mtu->hw_version,
869 mtu->u3_capable ? "U3" : "U2");
870
871 mtu3_check_params(mtu);
872
873 mtu3_device_reset(mtu);
874
875 ret = mtu3_device_enable(mtu);
876 if (ret) {
877 dev_err(mtu->dev, "device enable failed %d\n", ret);
878 return ret;
879 }
880
881 ret = mtu3_mem_alloc(mtu);
882 if (ret)
883 return -ENOMEM;
884
885 mtu3_regs_init(mtu);
886
887 return 0;
888}
889
890static void mtu3_hw_exit(struct mtu3 *mtu)
891{
892 mtu3_device_disable(mtu);
893 mtu3_mem_free(mtu);
894}
895
896/*
897 * we set 32-bit DMA mask by default, here check whether the controller
898 * supports 36-bit DMA or not, if it does, set 36-bit DMA mask.
899 */
900static int mtu3_set_dma_mask(struct mtu3 *mtu)
901{
902 struct device *dev = mtu->dev;
903 bool is_36bit = false;
904 int ret = 0;
905 u32 value;
906
907 value = mtu3_readl(base: mtu->mac_base, U3D_MISC_CTRL);
908 if (value & DMA_ADDR_36BIT) {
909 is_36bit = true;
910 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(36));
911 /* If set 36-bit DMA mask fails, fall back to 32-bit DMA mask */
912 if (ret) {
913 is_36bit = false;
914 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
915 }
916 }
917 dev_info(dev, "dma mask: %s bits\n", is_36bit ? "36" : "32");
918
919 return ret;
920}
921
922int ssusb_gadget_init(struct ssusb_mtk *ssusb)
923{
924 struct device *dev = ssusb->dev;
925 struct platform_device *pdev = to_platform_device(dev);
926 struct mtu3 *mtu = NULL;
927 int ret = -ENOMEM;
928
929 mtu = devm_kzalloc(dev, size: sizeof(struct mtu3), GFP_KERNEL);
930 if (mtu == NULL)
931 return -ENOMEM;
932
933 mtu->irq = platform_get_irq_byname_optional(dev: pdev, name: "device");
934 if (mtu->irq < 0) {
935 if (mtu->irq == -EPROBE_DEFER)
936 return mtu->irq;
937
938 /* for backward compatibility */
939 mtu->irq = platform_get_irq(pdev, 0);
940 if (mtu->irq < 0)
941 return mtu->irq;
942 }
943 dev_info(dev, "irq %d\n", mtu->irq);
944
945 mtu->mac_base = devm_platform_ioremap_resource_byname(pdev, name: "mac");
946 if (IS_ERR(ptr: mtu->mac_base)) {
947 dev_err(dev, "error mapping memory for dev mac\n");
948 return PTR_ERR(ptr: mtu->mac_base);
949 }
950
951 spin_lock_init(&mtu->lock);
952 mtu->dev = dev;
953 mtu->ippc_base = ssusb->ippc_base;
954 ssusb->mac_base = mtu->mac_base;
955 ssusb->u3d = mtu;
956 mtu->ssusb = ssusb;
957 mtu->max_speed = usb_get_maximum_speed(dev);
958
959 dev_dbg(dev, "mac_base=0x%p, ippc_base=0x%p\n",
960 mtu->mac_base, mtu->ippc_base);
961
962 ret = mtu3_hw_init(mtu);
963 if (ret) {
964 dev_err(dev, "mtu3 hw init failed:%d\n", ret);
965 return ret;
966 }
967
968 ret = mtu3_set_dma_mask(mtu);
969 if (ret) {
970 dev_err(dev, "mtu3 set dma_mask failed:%d\n", ret);
971 goto dma_mask_err;
972 }
973
974 ret = devm_request_threaded_irq(dev, irq: mtu->irq, NULL, thread_fn: mtu3_irq,
975 IRQF_ONESHOT, devname: dev_name(dev), dev_id: mtu);
976 if (ret) {
977 dev_err(dev, "request irq %d failed!\n", mtu->irq);
978 goto irq_err;
979 }
980
981 /* power down device IP for power saving by default */
982 mtu3_stop(mtu);
983
984 ret = mtu3_gadget_setup(mtu);
985 if (ret) {
986 dev_err(dev, "mtu3 gadget init failed:%d\n", ret);
987 goto gadget_err;
988 }
989
990 ssusb_dev_debugfs_init(ssusb);
991
992 dev_dbg(dev, " %s() done...\n", __func__);
993
994 return 0;
995
996gadget_err:
997 device_init_wakeup(dev, enable: false);
998
999dma_mask_err:
1000irq_err:
1001 mtu3_hw_exit(mtu);
1002 ssusb->u3d = NULL;
1003 dev_err(dev, " %s() fail...\n", __func__);
1004
1005 return ret;
1006}
1007
1008void ssusb_gadget_exit(struct ssusb_mtk *ssusb)
1009{
1010 struct mtu3 *mtu = ssusb->u3d;
1011
1012 mtu3_gadget_cleanup(mtu);
1013 device_init_wakeup(dev: ssusb->dev, enable: false);
1014 mtu3_hw_exit(mtu);
1015}
1016
1017bool ssusb_gadget_ip_sleep_check(struct ssusb_mtk *ssusb)
1018{
1019 struct mtu3 *mtu = ssusb->u3d;
1020
1021 /* host only, should wait for ip sleep */
1022 if (!mtu)
1023 return true;
1024
1025 /* device is started and pullup D+, ip can sleep */
1026 if (mtu->is_active && mtu->softconnect)
1027 return true;
1028
1029 /* ip can't sleep if not pullup D+ when support device mode */
1030 return false;
1031}
1032
1033int ssusb_gadget_suspend(struct ssusb_mtk *ssusb, pm_message_t msg)
1034{
1035 struct mtu3 *mtu = ssusb->u3d;
1036
1037 if (!mtu->gadget_driver)
1038 return 0;
1039
1040 if (mtu->connected)
1041 return -EBUSY;
1042
1043 mtu3_dev_suspend(mtu);
1044 synchronize_irq(irq: mtu->irq);
1045
1046 return 0;
1047}
1048
1049int ssusb_gadget_resume(struct ssusb_mtk *ssusb, pm_message_t msg)
1050{
1051 struct mtu3 *mtu = ssusb->u3d;
1052
1053 if (!mtu->gadget_driver)
1054 return 0;
1055
1056 mtu3_dev_resume(mtu);
1057
1058 return 0;
1059}
1060

source code of linux/drivers/usb/mtu3/mtu3_core.c