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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / usb / mtu3 / mtu3_core.c
blob9dd02160cca97e9242aac125d104df80cd72e3e3
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
23 static 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(fifo->bitmap,
37 fifo->limit, 0, num_bits, 0);
38 if (start_bit >= fifo->limit)
39 return -EOVERFLOW;
40
41 bitmap_set(fifo->bitmap, start_bit, 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
51 static 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(fifo->bitmap, start_bit, 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 */
71 static 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(mtu->mac_base, U3D_USB3_CONFIG, USB3_EN);
76 else
77 mtu3_clrbits(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 */
83 static inline void mtu3_hs_softconn_set(struct mtu3 *mtu, bool enable)
84 {
85 if (enable) {
86 mtu3_setbits(mtu->mac_base, U3D_POWER_MANAGEMENT,
87 SOFT_CONN | SUSPENDM_ENABLE);
88 } else {
89 mtu3_clrbits(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 */
96 static int mtu3_device_enable(struct mtu3 *mtu)
97 {
98 void __iomem *ibase = mtu->ippc_base;
99 u32 check_clk = 0;
100
101 mtu3_clrbits(ibase, U3D_SSUSB_IP_PW_CTRL2, SSUSB_IP_DEV_PDN);
102
103 if (mtu->is_u3_ip) {
104 check_clk = SSUSB_U3_MAC_RST_B_STS;
105 mtu3_clrbits(ibase, SSUSB_U3_CTRL(0),
106 (SSUSB_U3_PORT_DIS | SSUSB_U3_PORT_PDN |
107 SSUSB_U3_PORT_HOST_SEL));
108 }
109 mtu3_clrbits(ibase, SSUSB_U2_CTRL(0),
110 (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(ibase, SSUSB_U2_CTRL(0), SSUSB_U2_PORT_OTG_SEL);
115 if (mtu->is_u3_ip)
116 mtu3_setbits(ibase, SSUSB_U3_CTRL(0),
117 SSUSB_U3_PORT_DUAL_MODE);
118 }
119
120 return ssusb_check_clocks(mtu->ssusb, check_clk);
121 }
122
123 static void mtu3_device_disable(struct mtu3 *mtu)
124 {
125 void __iomem *ibase = mtu->ippc_base;
126
127 if (mtu->is_u3_ip)
128 mtu3_setbits(ibase, SSUSB_U3_CTRL(0),
129 (SSUSB_U3_PORT_DIS | SSUSB_U3_PORT_PDN));
130
131 mtu3_setbits(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(ibase, SSUSB_U2_CTRL(0), SSUSB_U2_PORT_OTG_SEL);
136
137 mtu3_setbits(ibase, U3D_SSUSB_IP_PW_CTRL2, SSUSB_IP_DEV_PDN);
138 }
139
140 /* reset U3D's device module. */
141 static void mtu3_device_reset(struct mtu3 *mtu)
142 {
143 void __iomem *ibase = mtu->ippc_base;
144
145 mtu3_setbits(ibase, U3D_SSUSB_DEV_RST_CTRL, SSUSB_DEV_SW_RST);
146 udelay(1);
147 mtu3_clrbits(ibase, U3D_SSUSB_DEV_RST_CTRL, SSUSB_DEV_SW_RST);
148 }
149
150 /* disable all interrupts */
151 static void mtu3_intr_disable(struct mtu3 *mtu)
152 {
153 void __iomem *mbase = mtu->mac_base;
154
155 /* Disable level 1 interrupts */
156 mtu3_writel(mbase, U3D_LV1IECR, ~0x0);
157 /* Disable endpoint interrupts */
158 mtu3_writel(mbase, U3D_EPIECR, ~0x0);
159 }
160
161 static void mtu3_intr_status_clear(struct mtu3 *mtu)
162 {
163 void __iomem *mbase = mtu->mac_base;
164
165 /* Clear EP0 and Tx/Rx EPn interrupts status */
166 mtu3_writel(mbase, U3D_EPISR, ~0x0);
167 /* Clear U2 USB common interrupts status */
168 mtu3_writel(mbase, U3D_COMMON_USB_INTR, ~0x0);
169 /* Clear U3 LTSSM interrupts status */
170 mtu3_writel(mbase, U3D_LTSSM_INTR, ~0x0);
171 /* Clear speed change interrupt status */
172 mtu3_writel(mbase, U3D_DEV_LINK_INTR, ~0x0);
173 }
174
175 /* enable system global interrupt */
176 static void mtu3_intr_enable(struct mtu3 *mtu)
177 {
178 void __iomem *mbase = mtu->mac_base;
179 u32 value;
180
181 /*Enable level 1 interrupts (BMU, QMU, MAC3, DMA, MAC2, EPCTL) */
182 value = BMU_INTR | QMU_INTR | MAC3_INTR | MAC2_INTR | EP_CTRL_INTR;
183 mtu3_writel(mbase, U3D_LV1IESR, value);
184
185 /* Enable U2 common USB interrupts */
186 value = SUSPEND_INTR | RESUME_INTR | RESET_INTR;
187 mtu3_writel(mbase, U3D_COMMON_USB_INTR_ENABLE, value);
188
189 if (mtu->is_u3_ip) {
190 /* Enable U3 LTSSM interrupts */
191 value = HOT_RST_INTR | WARM_RST_INTR |
192 ENTER_U3_INTR | EXIT_U3_INTR;
193 mtu3_writel(mbase, U3D_LTSSM_INTR_ENABLE, value);
194 }
195
196 /* Enable QMU interrupts. */
197 value = TXQ_CSERR_INT | TXQ_LENERR_INT | RXQ_CSERR_INT |
198 RXQ_LENERR_INT | RXQ_ZLPERR_INT;
199 mtu3_writel(mbase, U3D_QIESR1, value);
200
201 /* Enable speed change interrupt */
202 mtu3_writel(mbase, U3D_DEV_LINK_INTR_ENABLE, SSUSB_DEV_SPEED_CHG_INTR);
203 }
204
205 /* reset: u2 - data toggle, u3 - SeqN, flow control status etc */
206 static void mtu3_ep_reset(struct mtu3_ep *mep)
207 {
208 struct mtu3 *mtu = mep->mtu;
209 u32 rst_bit = EP_RST(mep->is_in, mep->epnum);
210
211 mtu3_setbits(mtu->mac_base, U3D_EP_RST, rst_bit);
212 mtu3_clrbits(mtu->mac_base, U3D_EP_RST, rst_bit);
213 }
214
215 /* set/clear the stall and toggle bits for non-ep0 */
216 void mtu3_ep_stall_set(struct mtu3_ep *mep, bool set)
217 {
218 struct mtu3 *mtu = mep->mtu;
219 void __iomem *mbase = mtu->mac_base;
220 u8 epnum = mep->epnum;
221 u32 csr;
222
223 if (mep->is_in) { /* TX */
224 csr = mtu3_readl(mbase, MU3D_EP_TXCR0(epnum)) & TX_W1C_BITS;
225 if (set)
226 csr |= TX_SENDSTALL;
227 else
228 csr = (csr & (~TX_SENDSTALL)) | TX_SENTSTALL;
229 mtu3_writel(mbase, MU3D_EP_TXCR0(epnum), csr);
230 } else { /* RX */
231 csr = mtu3_readl(mbase, MU3D_EP_RXCR0(epnum)) & RX_W1C_BITS;
232 if (set)
233 csr |= RX_SENDSTALL;
234 else
235 csr = (csr & (~RX_SENDSTALL)) | RX_SENTSTALL;
236 mtu3_writel(mbase, MU3D_EP_RXCR0(epnum), csr);
237 }
238
239 if (!set) {
240 mtu3_ep_reset(mep);
241 mep->flags &= ~MTU3_EP_STALL;
242 } else {
243 mep->flags |= MTU3_EP_STALL;
244 }
245
246 dev_dbg(mtu->dev, "%s: %s\n", mep->name,
247 set ? "SEND STALL" : "CLEAR STALL, with EP RESET");
248 }
249
250 void mtu3_dev_on_off(struct mtu3 *mtu, int is_on)
251 {
252 if (mtu->is_u3_ip && mtu->max_speed >= USB_SPEED_SUPER)
253 mtu3_ss_func_set(mtu, is_on);
254 else
255 mtu3_hs_softconn_set(mtu, is_on);
256
257 dev_info(mtu->dev, "gadget (%s) pullup D%s\n",
258 usb_speed_string(mtu->max_speed), is_on ? "+" : "-");
259 }
260
261 void mtu3_start(struct mtu3 *mtu)
262 {
263 void __iomem *mbase = mtu->mac_base;
264
265 dev_dbg(mtu->dev, "%s devctl 0x%x\n", __func__,
266 mtu3_readl(mbase, U3D_DEVICE_CONTROL));
267
268 mtu3_clrbits(mtu->ippc_base, U3D_SSUSB_IP_PW_CTRL2, SSUSB_IP_DEV_PDN);
269
270 /*
271 * When disable U2 port, USB2_CSR's register will be reset to
272 * default value after re-enable it again(HS is enabled by default).
273 * So if force mac to work as FS, disable HS function.
274 */
275 if (mtu->max_speed == USB_SPEED_FULL)
276 mtu3_clrbits(mbase, U3D_POWER_MANAGEMENT, HS_ENABLE);
277
278 /* Initialize the default interrupts */
279 mtu3_intr_enable(mtu);
280 mtu->is_active = 1;
281
282 if (mtu->softconnect)
283 mtu3_dev_on_off(mtu, 1);
284 }
285
286 void mtu3_stop(struct mtu3 *mtu)
287 {
288 dev_dbg(mtu->dev, "%s\n", __func__);
289
290 mtu3_intr_disable(mtu);
291 mtu3_intr_status_clear(mtu);
292
293 if (mtu->softconnect)
294 mtu3_dev_on_off(mtu, 0);
295
296 mtu->is_active = 0;
297 mtu3_setbits(mtu->ippc_base, U3D_SSUSB_IP_PW_CTRL2, SSUSB_IP_DEV_PDN);
298 }
299
300 /* for non-ep0 */
301 int mtu3_config_ep(struct mtu3 *mtu, struct mtu3_ep *mep,
302 int interval, int burst, int mult)
303 {
304 void __iomem *mbase = mtu->mac_base;
305 bool gen2cp = mtu->gen2cp;
306 int epnum = mep->epnum;
307 u32 csr0, csr1, csr2;
308 int fifo_sgsz, fifo_addr;
309 int num_pkts;
310
311 fifo_addr = ep_fifo_alloc(mep, mep->maxp);
312 if (fifo_addr < 0) {
313 dev_err(mtu->dev, "alloc ep fifo failed(%d)\n", mep->maxp);
314 return -ENOMEM;
315 }
316 fifo_sgsz = ilog2(mep->fifo_seg_size);
317 dev_dbg(mtu->dev, "%s fifosz: %x(%x/%x)\n", __func__, fifo_sgsz,
318 mep->fifo_seg_size, mep->fifo_size);
319
320 if (mep->is_in) {
321 csr0 = TX_TXMAXPKTSZ(mep->maxp);
322 csr0 |= TX_DMAREQEN;
323
324 num_pkts = (burst + 1) * (mult + 1) - 1;
325 csr1 = TX_SS_BURST(burst) | TX_SLOT(mep->slot);
326 csr1 |= TX_MAX_PKT(gen2cp, num_pkts) | TX_MULT(gen2cp, mult);
327
328 csr2 = TX_FIFOADDR(fifo_addr >> 4);
329 csr2 |= TX_FIFOSEGSIZE(fifo_sgsz);
330
331 switch (mep->type) {
332 case USB_ENDPOINT_XFER_BULK:
333 csr1 |= TX_TYPE(TYPE_BULK);
334 break;
335 case USB_ENDPOINT_XFER_ISOC:
336 csr1 |= TX_TYPE(TYPE_ISO);
337 csr2 |= TX_BINTERVAL(interval);
338 break;
339 case USB_ENDPOINT_XFER_INT:
340 csr1 |= TX_TYPE(TYPE_INT);
341 csr2 |= TX_BINTERVAL(interval);
342 break;
343 }
344
345 /* Enable QMU Done interrupt */
346 mtu3_setbits(mbase, U3D_QIESR0, QMU_TX_DONE_INT(epnum));
347
348 mtu3_writel(mbase, MU3D_EP_TXCR0(epnum), csr0);
349 mtu3_writel(mbase, MU3D_EP_TXCR1(epnum), csr1);
350 mtu3_writel(mbase, MU3D_EP_TXCR2(epnum), csr2);
351
352 dev_dbg(mtu->dev, "U3D_TX%d CSR0:%#x, CSR1:%#x, CSR2:%#x\n",
353 epnum, mtu3_readl(mbase, MU3D_EP_TXCR0(epnum)),
354 mtu3_readl(mbase, MU3D_EP_TXCR1(epnum)),
355 mtu3_readl(mbase, MU3D_EP_TXCR2(epnum)));
356 } else {
357 csr0 = RX_RXMAXPKTSZ(mep->maxp);
358 csr0 |= RX_DMAREQEN;
359
360 num_pkts = (burst + 1) * (mult + 1) - 1;
361 csr1 = RX_SS_BURST(burst) | RX_SLOT(mep->slot);
362 csr1 |= RX_MAX_PKT(gen2cp, num_pkts) | RX_MULT(gen2cp, mult);
363
364 csr2 = RX_FIFOADDR(fifo_addr >> 4);
365 csr2 |= RX_FIFOSEGSIZE(fifo_sgsz);
366
367 switch (mep->type) {
368 case USB_ENDPOINT_XFER_BULK:
369 csr1 |= RX_TYPE(TYPE_BULK);
370 break;
371 case USB_ENDPOINT_XFER_ISOC:
372 csr1 |= RX_TYPE(TYPE_ISO);
373 csr2 |= RX_BINTERVAL(interval);
374 break;
375 case USB_ENDPOINT_XFER_INT:
376 csr1 |= RX_TYPE(TYPE_INT);
377 csr2 |= RX_BINTERVAL(interval);
378 break;
379 }
380
381 /*Enable QMU Done interrupt */
382 mtu3_setbits(mbase, U3D_QIESR0, QMU_RX_DONE_INT(epnum));
383
384 mtu3_writel(mbase, MU3D_EP_RXCR0(epnum), csr0);
385 mtu3_writel(mbase, MU3D_EP_RXCR1(epnum), csr1);
386 mtu3_writel(mbase, MU3D_EP_RXCR2(epnum), csr2);
387
388 dev_dbg(mtu->dev, "U3D_RX%d CSR0:%#x, CSR1:%#x, CSR2:%#x\n",
389 epnum, mtu3_readl(mbase, MU3D_EP_RXCR0(epnum)),
390 mtu3_readl(mbase, MU3D_EP_RXCR1(epnum)),
391 mtu3_readl(mbase, MU3D_EP_RXCR2(epnum)));
392 }
393
394 dev_dbg(mtu->dev, "csr0:%#x, csr1:%#x, csr2:%#x\n", csr0, csr1, csr2);
395 dev_dbg(mtu->dev, "%s: %s, fifo-addr:%#x, fifo-size:%#x(%#x/%#x)\n",
396 __func__, mep->name, mep->fifo_addr, mep->fifo_size,
397 fifo_sgsz, mep->fifo_seg_size);
398
399 return 0;
400 }
401
402 /* for non-ep0 */
403 void mtu3_deconfig_ep(struct mtu3 *mtu, struct mtu3_ep *mep)
404 {
405 void __iomem *mbase = mtu->mac_base;
406 int epnum = mep->epnum;
407
408 if (mep->is_in) {
409 mtu3_writel(mbase, MU3D_EP_TXCR0(epnum), 0);
410 mtu3_writel(mbase, MU3D_EP_TXCR1(epnum), 0);
411 mtu3_writel(mbase, MU3D_EP_TXCR2(epnum), 0);
412 mtu3_setbits(mbase, U3D_QIECR0, QMU_TX_DONE_INT(epnum));
413 } else {
414 mtu3_writel(mbase, MU3D_EP_RXCR0(epnum), 0);
415 mtu3_writel(mbase, MU3D_EP_RXCR1(epnum), 0);
416 mtu3_writel(mbase, MU3D_EP_RXCR2(epnum), 0);
417 mtu3_setbits(mbase, U3D_QIECR0, QMU_RX_DONE_INT(epnum));
418 }
419
420 mtu3_ep_reset(mep);
421 ep_fifo_free(mep);
422
423 dev_dbg(mtu->dev, "%s: %s\n", __func__, mep->name);
424 }
425
426 /*
427 * Two scenarios:
428 * 1. when device IP supports SS, the fifo of EP0, TX EPs, RX EPs
429 * are separated;
430 * 2. when supports only HS, the fifo is shared for all EPs, and
431 * the capability registers of @EPNTXFFSZ or @EPNRXFFSZ indicate
432 * the total fifo size of non-ep0, and ep0's is fixed to 64B,
433 * so the total fifo size is 64B + @EPNTXFFSZ;
434 * Due to the first 64B should be reserved for EP0, non-ep0's fifo
435 * starts from offset 64 and are divided into two equal parts for
436 * TX or RX EPs for simplification.
437 */
438 static void get_ep_fifo_config(struct mtu3 *mtu)
439 {
440 struct mtu3_fifo_info *tx_fifo;
441 struct mtu3_fifo_info *rx_fifo;
442 u32 fifosize;
443
444 if (mtu->is_u3_ip) {
445 fifosize = mtu3_readl(mtu->mac_base, U3D_CAP_EPNTXFFSZ);
446 tx_fifo = &mtu->tx_fifo;
447 tx_fifo->base = 0;
448 tx_fifo->limit = fifosize / MTU3_EP_FIFO_UNIT;
449 bitmap_zero(tx_fifo->bitmap, MTU3_FIFO_BIT_SIZE);
450
451 fifosize = mtu3_readl(mtu->mac_base, U3D_CAP_EPNRXFFSZ);
452 rx_fifo = &mtu->rx_fifo;
453 rx_fifo->base = 0;
454 rx_fifo->limit = fifosize / MTU3_EP_FIFO_UNIT;
455 bitmap_zero(rx_fifo->bitmap, MTU3_FIFO_BIT_SIZE);
456 mtu->slot = MTU3_U3_IP_SLOT_DEFAULT;
457 } else {
458 fifosize = mtu3_readl(mtu->mac_base, U3D_CAP_EPNTXFFSZ);
459 tx_fifo = &mtu->tx_fifo;
460 tx_fifo->base = MTU3_U2_IP_EP0_FIFO_SIZE;
461 tx_fifo->limit = (fifosize / MTU3_EP_FIFO_UNIT) >> 1;
462 bitmap_zero(tx_fifo->bitmap, MTU3_FIFO_BIT_SIZE);
463
464 rx_fifo = &mtu->rx_fifo;
465 rx_fifo->base =
466 tx_fifo->base + tx_fifo->limit * MTU3_EP_FIFO_UNIT;
467 rx_fifo->limit = tx_fifo->limit;
468 bitmap_zero(rx_fifo->bitmap, MTU3_FIFO_BIT_SIZE);
469 mtu->slot = MTU3_U2_IP_SLOT_DEFAULT;
470 }
471
472 dev_dbg(mtu->dev, "%s, TX: base-%d, limit-%d; RX: base-%d, limit-%d\n",
473 __func__, tx_fifo->base, tx_fifo->limit,
474 rx_fifo->base, rx_fifo->limit);
475 }
476
477 void mtu3_ep0_setup(struct mtu3 *mtu)
478 {
479 u32 maxpacket = mtu->g.ep0->maxpacket;
480 u32 csr;
481
482 dev_dbg(mtu->dev, "%s maxpacket: %d\n", __func__, maxpacket);
483
484 csr = mtu3_readl(mtu->mac_base, U3D_EP0CSR);
485 csr &= ~EP0_MAXPKTSZ_MSK;
486 csr |= EP0_MAXPKTSZ(maxpacket);
487 csr &= EP0_W1C_BITS;
488 mtu3_writel(mtu->mac_base, U3D_EP0CSR, csr);
489
490 /* Enable EP0 interrupt */
491 mtu3_writel(mtu->mac_base, U3D_EPIESR, EP0ISR | SETUPENDISR);
492 }
493
494 static int mtu3_mem_alloc(struct mtu3 *mtu)
495 {
496 void __iomem *mbase = mtu->mac_base;
497 struct mtu3_ep *ep_array;
498 int in_ep_num, out_ep_num;
499 u32 cap_epinfo;
500 int ret;
501 int i;
502
503 cap_epinfo = mtu3_readl(mbase, U3D_CAP_EPINFO);
504 in_ep_num = CAP_TX_EP_NUM(cap_epinfo);
505 out_ep_num = CAP_RX_EP_NUM(cap_epinfo);
506
507 dev_info(mtu->dev, "fifosz/epnum: Tx=%#x/%d, Rx=%#x/%d\n",
508 mtu3_readl(mbase, U3D_CAP_EPNTXFFSZ), in_ep_num,
509 mtu3_readl(mbase, U3D_CAP_EPNRXFFSZ), out_ep_num);
510
511 /* one for ep0, another is reserved */
512 mtu->num_eps = min(in_ep_num, out_ep_num) + 1;
513 ep_array = kcalloc(mtu->num_eps * 2, sizeof(*ep_array), GFP_KERNEL);
514 if (ep_array == NULL)
515 return -ENOMEM;
516
517 mtu->ep_array = ep_array;
518 mtu->in_eps = ep_array;
519 mtu->out_eps = &ep_array[mtu->num_eps];
520 /* ep0 uses in_eps[0], out_eps[0] is reserved */
521 mtu->ep0 = mtu->in_eps;
522 mtu->ep0->mtu = mtu;
523 mtu->ep0->epnum = 0;
524
525 for (i = 1; i < mtu->num_eps; i++) {
526 struct mtu3_ep *mep = mtu->in_eps + i;
527
528 mep->fifo = &mtu->tx_fifo;
529 mep = mtu->out_eps + i;
530 mep->fifo = &mtu->rx_fifo;
531 }
532
533 get_ep_fifo_config(mtu);
534
535 ret = mtu3_qmu_init(mtu);
536 if (ret)
537 kfree(mtu->ep_array);
538
539 return ret;
540 }
541
542 static void mtu3_mem_free(struct mtu3 *mtu)
543 {
544 mtu3_qmu_exit(mtu);
545 kfree(mtu->ep_array);
546 }
547
548 static void mtu3_set_speed(struct mtu3 *mtu)
549 {
550 void __iomem *mbase = mtu->mac_base;
551
552 if (!mtu->is_u3_ip && (mtu->max_speed > USB_SPEED_HIGH))
553 mtu->max_speed = USB_SPEED_HIGH;
554
555 if (mtu->max_speed == USB_SPEED_FULL) {
556 /* disable U3 SS function */
557 mtu3_clrbits(mbase, U3D_USB3_CONFIG, USB3_EN);
558 /* disable HS function */
559 mtu3_clrbits(mbase, U3D_POWER_MANAGEMENT, HS_ENABLE);
560 } else if (mtu->max_speed == USB_SPEED_HIGH) {
561 mtu3_clrbits(mbase, U3D_USB3_CONFIG, USB3_EN);
562 /* HS/FS detected by HW */
563 mtu3_setbits(mbase, U3D_POWER_MANAGEMENT, HS_ENABLE);
564 } else if (mtu->max_speed == USB_SPEED_SUPER) {
565 mtu3_clrbits(mtu->ippc_base, SSUSB_U3_CTRL(0),
566 SSUSB_U3_PORT_SSP_SPEED);
567 }
568
569 dev_info(mtu->dev, "max_speed: %s\n",
570 usb_speed_string(mtu->max_speed));
571 }
572
573 static void mtu3_regs_init(struct mtu3 *mtu)
574 {
575
576 void __iomem *mbase = mtu->mac_base;
577
578 /* be sure interrupts are disabled before registration of ISR */
579 mtu3_intr_disable(mtu);
580 mtu3_intr_status_clear(mtu);
581
582 if (mtu->is_u3_ip) {
583 /* disable LGO_U1/U2 by default */
584 mtu3_clrbits(mbase, U3D_LINK_POWER_CONTROL,
585 SW_U1_REQUEST_ENABLE | SW_U2_REQUEST_ENABLE);
586 /* enable accept LGO_U1/U2 link command from host */
587 mtu3_setbits(mbase, U3D_LINK_POWER_CONTROL,
588 SW_U1_ACCEPT_ENABLE | SW_U2_ACCEPT_ENABLE);
589 /* device responses to u3_exit from host automatically */
590 mtu3_clrbits(mbase, U3D_LTSSM_CTRL, SOFT_U3_EXIT_EN);
591 /* automatically build U2 link when U3 detect fail */
592 mtu3_setbits(mbase, U3D_USB2_TEST_MODE, U2U3_AUTO_SWITCH);
593 /* auto clear SOFT_CONN when clear USB3_EN if work as HS */
594 mtu3_setbits(mbase, U3D_U3U2_SWITCH_CTRL, SOFTCON_CLR_AUTO_EN);
595 }
596
597 mtu3_set_speed(mtu);
598
599 /* delay about 0.1us from detecting reset to send chirp-K */
600 mtu3_clrbits(mbase, U3D_LINK_RESET_INFO, WTCHRP_MSK);
601 /* U2/U3 detected by HW */
602 mtu3_writel(mbase, U3D_DEVICE_CONF, 0);
603 /* vbus detected by HW */
604 mtu3_clrbits(mbase, U3D_MISC_CTRL, VBUS_FRC_EN | VBUS_ON);
605 /* enable automatical HWRW from L1 */
606 mtu3_setbits(mbase, U3D_POWER_MANAGEMENT, LPM_HRWE);
607
608 /* use new QMU format when HW version >= 0x1003 */
609 if (mtu->gen2cp)
610 mtu3_writel(mbase, U3D_QFCR, ~0x0);
611 }
612
613 static irqreturn_t mtu3_link_isr(struct mtu3 *mtu)
614 {
615 void __iomem *mbase = mtu->mac_base;
616 enum usb_device_speed udev_speed;
617 u32 maxpkt = 64;
618 u32 link;
619 u32 speed;
620
621 link = mtu3_readl(mbase, U3D_DEV_LINK_INTR);
622 link &= mtu3_readl(mbase, U3D_DEV_LINK_INTR_ENABLE);
623 mtu3_writel(mbase, U3D_DEV_LINK_INTR, link); /* W1C */
624 dev_dbg(mtu->dev, "=== LINK[%x] ===\n", link);
625
626 if (!(link & SSUSB_DEV_SPEED_CHG_INTR))
627 return IRQ_NONE;
628
629 speed = SSUSB_DEV_SPEED(mtu3_readl(mbase, U3D_DEVICE_CONF));
630
631 switch (speed) {
632 case MTU3_SPEED_FULL:
633 udev_speed = USB_SPEED_FULL;
634 /*BESLCK = 4 < BESLCK_U3 = 10 < BESLDCK = 15 */
635 mtu3_writel(mbase, U3D_USB20_LPM_PARAMETER, LPM_BESLDCK(0xf)
636 | LPM_BESLCK(4) | LPM_BESLCK_U3(0xa));
637 mtu3_setbits(mbase, U3D_POWER_MANAGEMENT,
638 LPM_BESL_STALL | LPM_BESLD_STALL);
639 break;
640 case MTU3_SPEED_HIGH:
641 udev_speed = USB_SPEED_HIGH;
642 /*BESLCK = 4 < BESLCK_U3 = 10 < BESLDCK = 15 */
643 mtu3_writel(mbase, U3D_USB20_LPM_PARAMETER, LPM_BESLDCK(0xf)
644 | LPM_BESLCK(4) | LPM_BESLCK_U3(0xa));
645 mtu3_setbits(mbase, U3D_POWER_MANAGEMENT,
646 LPM_BESL_STALL | LPM_BESLD_STALL);
647 break;
648 case MTU3_SPEED_SUPER:
649 udev_speed = USB_SPEED_SUPER;
650 maxpkt = 512;
651 break;
652 case MTU3_SPEED_SUPER_PLUS:
653 udev_speed = USB_SPEED_SUPER_PLUS;
654 maxpkt = 512;
655 break;
656 default:
657 udev_speed = USB_SPEED_UNKNOWN;
658 break;
659 }
660 dev_dbg(mtu->dev, "%s: %s\n", __func__, usb_speed_string(udev_speed));
661 mtu3_dbg_trace(mtu->dev, "link speed %s",
662 usb_speed_string(udev_speed));
663
664 mtu->g.speed = udev_speed;
665 mtu->g.ep0->maxpacket = maxpkt;
666 mtu->ep0_state = MU3D_EP0_STATE_SETUP;
667
668 if (udev_speed == USB_SPEED_UNKNOWN)
669 mtu3_gadget_disconnect(mtu);
670 else
671 mtu3_ep0_setup(mtu);
672
673 return IRQ_HANDLED;
674 }
675
676 static irqreturn_t mtu3_u3_ltssm_isr(struct mtu3 *mtu)
677 {
678 void __iomem *mbase = mtu->mac_base;
679 u32 ltssm;
680
681 ltssm = mtu3_readl(mbase, U3D_LTSSM_INTR);
682 ltssm &= mtu3_readl(mbase, U3D_LTSSM_INTR_ENABLE);
683 mtu3_writel(mbase, U3D_LTSSM_INTR, ltssm); /* W1C */
684 dev_dbg(mtu->dev, "=== LTSSM[%x] ===\n", ltssm);
685 trace_mtu3_u3_ltssm_isr(ltssm);
686
687 if (ltssm & (HOT_RST_INTR | WARM_RST_INTR))
688 mtu3_gadget_reset(mtu);
689
690 if (ltssm & VBUS_FALL_INTR) {
691 mtu3_ss_func_set(mtu, false);
692 mtu3_gadget_reset(mtu);
693 }
694
695 if (ltssm & VBUS_RISE_INTR)
696 mtu3_ss_func_set(mtu, true);
697
698 if (ltssm & EXIT_U3_INTR)
699 mtu3_gadget_resume(mtu);
700
701 if (ltssm & ENTER_U3_INTR)
702 mtu3_gadget_suspend(mtu);
703
704 return IRQ_HANDLED;
705 }
706
707 static irqreturn_t mtu3_u2_common_isr(struct mtu3 *mtu)
708 {
709 void __iomem *mbase = mtu->mac_base;
710 u32 u2comm;
711
712 u2comm = mtu3_readl(mbase, U3D_COMMON_USB_INTR);
713 u2comm &= mtu3_readl(mbase, U3D_COMMON_USB_INTR_ENABLE);
714 mtu3_writel(mbase, U3D_COMMON_USB_INTR, u2comm); /* W1C */
715 dev_dbg(mtu->dev, "=== U2COMM[%x] ===\n", u2comm);
716 trace_mtu3_u2_common_isr(u2comm);
717
718 if (u2comm & SUSPEND_INTR)
719 mtu3_gadget_suspend(mtu);
720
721 if (u2comm & RESUME_INTR)
722 mtu3_gadget_resume(mtu);
723
724 if (u2comm & RESET_INTR)
725 mtu3_gadget_reset(mtu);
726
727 return IRQ_HANDLED;
728 }
729
730 static irqreturn_t mtu3_irq(int irq, void *data)
731 {
732 struct mtu3 *mtu = (struct mtu3 *)data;
733 unsigned long flags;
734 u32 level1;
735
736 spin_lock_irqsave(&mtu->lock, flags);
737
738 /* U3D_LV1ISR is RU */
739 level1 = mtu3_readl(mtu->mac_base, U3D_LV1ISR);
740 level1 &= mtu3_readl(mtu->mac_base, U3D_LV1IER);
741
742 if (level1 & EP_CTRL_INTR)
743 mtu3_link_isr(mtu);
744
745 if (level1 & MAC2_INTR)
746 mtu3_u2_common_isr(mtu);
747
748 if (level1 & MAC3_INTR)
749 mtu3_u3_ltssm_isr(mtu);
750
751 if (level1 & BMU_INTR)
752 mtu3_ep0_isr(mtu);
753
754 if (level1 & QMU_INTR)
755 mtu3_qmu_isr(mtu);
756
757 spin_unlock_irqrestore(&mtu->lock, flags);
758
759 return IRQ_HANDLED;
760 }
761
762 static int mtu3_hw_init(struct mtu3 *mtu)
763 {
764 u32 value;
765 int ret;
766
767 value = mtu3_readl(mtu->ippc_base, U3D_SSUSB_IP_TRUNK_VERS);
768 mtu->hw_version = IP_TRUNK_VERS(value);
769 mtu->gen2cp = !!(mtu->hw_version >= MTU3_TRUNK_VERS_1003);
770
771 value = mtu3_readl(mtu->ippc_base, U3D_SSUSB_IP_DEV_CAP);
772 mtu->is_u3_ip = !!SSUSB_IP_DEV_U3_PORT_NUM(value);
773
774 dev_info(mtu->dev, "IP version 0x%x(%s IP)\n", mtu->hw_version,
775 mtu->is_u3_ip ? "U3" : "U2");
776
777 mtu3_device_reset(mtu);
778
779 ret = mtu3_device_enable(mtu);
780 if (ret) {
781 dev_err(mtu->dev, "device enable failed %d\n", ret);
782 return ret;
783 }
784
785 ret = mtu3_mem_alloc(mtu);
786 if (ret)
787 return -ENOMEM;
788
789 mtu3_regs_init(mtu);
790
791 return 0;
792 }
793
794 static void mtu3_hw_exit(struct mtu3 *mtu)
795 {
796 mtu3_device_disable(mtu);
797 mtu3_mem_free(mtu);
798 }
799
800 /**
801 * we set 32-bit DMA mask by default, here check whether the controller
802 * supports 36-bit DMA or not, if it does, set 36-bit DMA mask.
803 */
804 static int mtu3_set_dma_mask(struct mtu3 *mtu)
805 {
806 struct device *dev = mtu->dev;
807 bool is_36bit = false;
808 int ret = 0;
809 u32 value;
810
811 value = mtu3_readl(mtu->mac_base, U3D_MISC_CTRL);
812 if (value & DMA_ADDR_36BIT) {
813 is_36bit = true;
814 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(36));
815 /* If set 36-bit DMA mask fails, fall back to 32-bit DMA mask */
816 if (ret) {
817 is_36bit = false;
818 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
819 }
820 }
821 dev_info(dev, "dma mask: %s bits\n", is_36bit ? "36" : "32");
822
823 return ret;
824 }
825
826 int ssusb_gadget_init(struct ssusb_mtk *ssusb)
827 {
828 struct device *dev = ssusb->dev;
829 struct platform_device *pdev = to_platform_device(dev);
830 struct mtu3 *mtu = NULL;
831 struct resource *res;
832 int ret = -ENOMEM;
833
834 mtu = devm_kzalloc(dev, sizeof(struct mtu3), GFP_KERNEL);
835 if (mtu == NULL)
836 return -ENOMEM;
837
838 mtu->irq = platform_get_irq(pdev, 0);
839 if (mtu->irq < 0)
840 return mtu->irq;
841 dev_info(dev, "irq %d\n", mtu->irq);
842
843 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mac");
844 mtu->mac_base = devm_ioremap_resource(dev, res);
845 if (IS_ERR(mtu->mac_base)) {
846 dev_err(dev, "error mapping memory for dev mac\n");
847 return PTR_ERR(mtu->mac_base);
848 }
849
850 spin_lock_init(&mtu->lock);
851 mtu->dev = dev;
852 mtu->ippc_base = ssusb->ippc_base;
853 ssusb->mac_base = mtu->mac_base;
854 ssusb->u3d = mtu;
855 mtu->ssusb = ssusb;
856 mtu->max_speed = usb_get_maximum_speed(dev);
857
858 /* check the max_speed parameter */
859 switch (mtu->max_speed) {
860 case USB_SPEED_FULL:
861 case USB_SPEED_HIGH:
862 case USB_SPEED_SUPER:
863 case USB_SPEED_SUPER_PLUS:
864 break;
865 default:
866 dev_err(dev, "invalid max_speed: %s\n",
867 usb_speed_string(mtu->max_speed));
868 /* fall through */
869 case USB_SPEED_UNKNOWN:
870 /* default as SSP */
871 mtu->max_speed = USB_SPEED_SUPER_PLUS;
872 break;
873 }
874
875 dev_dbg(dev, "mac_base=0x%p, ippc_base=0x%p\n",
876 mtu->mac_base, mtu->ippc_base);
877
878 ret = mtu3_hw_init(mtu);
879 if (ret) {
880 dev_err(dev, "mtu3 hw init failed:%d\n", ret);
881 return ret;
882 }
883
884 ret = mtu3_set_dma_mask(mtu);
885 if (ret) {
886 dev_err(dev, "mtu3 set dma_mask failed:%d\n", ret);
887 goto dma_mask_err;
888 }
889
890 ret = devm_request_irq(dev, mtu->irq, mtu3_irq, 0, dev_name(dev), mtu);
891 if (ret) {
892 dev_err(dev, "request irq %d failed!\n", mtu->irq);
893 goto irq_err;
894 }
895
896 device_init_wakeup(dev, true);
897
898 ret = mtu3_gadget_setup(mtu);
899 if (ret) {
900 dev_err(dev, "mtu3 gadget init failed:%d\n", ret);
901 goto gadget_err;
902 }
903
904 /* init as host mode, power down device IP for power saving */
905 if (mtu->ssusb->dr_mode == USB_DR_MODE_OTG)
906 mtu3_stop(mtu);
907
908 ssusb_dev_debugfs_init(ssusb);
909
910 dev_dbg(dev, " %s() done...\n", __func__);
911
912 return 0;
913
914 gadget_err:
915 device_init_wakeup(dev, false);
916
917 dma_mask_err:
918 irq_err:
919 mtu3_hw_exit(mtu);
920 ssusb->u3d = NULL;
921 dev_err(dev, " %s() fail...\n", __func__);
922
923 return ret;
924 }
925
926 void ssusb_gadget_exit(struct ssusb_mtk *ssusb)
927 {
928 struct mtu3 *mtu = ssusb->u3d;
929
930 mtu3_gadget_cleanup(mtu);
931 device_init_wakeup(ssusb->dev, false);
932 mtu3_hw_exit(mtu);
933 }
Linux with added FPC-III support