1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Freescale QUICC Engine USB Host Controller Driver
4  *
5  * Copyright (c) Freescale Semicondutor, Inc. 2006.
6  *               Shlomi Gridish <gridish@freescale.com>
7  *               Jerry Huang <Chang-Ming.Huang@freescale.com>
8  * Copyright (c) Logic Product Development, Inc. 2007
9  *               Peter Barada <peterb@logicpd.com>
10  * Copyright (c) MontaVista Software, Inc. 2008.
11  *               Anton Vorontsov <avorontsov@ru.mvista.com>
12  */
13 
14 #include <linux/kernel.h>
15 #include <linux/types.h>
16 #include <linux/spinlock.h>
17 #include <linux/errno.h>
18 #include <linux/slab.h>
19 #include <linux/list.h>
20 #include <linux/usb.h>
21 #include <linux/usb/hcd.h>
22 #include "fhci.h"
23 
24 /* maps the hardware error code to the USB error code */
status_to_error(u32 status)25 static int status_to_error(u32 status)
26 {
27 	if (status == USB_TD_OK)
28 		return 0;
29 	else if (status & USB_TD_RX_ER_CRC)
30 		return -EILSEQ;
31 	else if (status & USB_TD_RX_ER_NONOCT)
32 		return -EPROTO;
33 	else if (status & USB_TD_RX_ER_OVERUN)
34 		return -ECOMM;
35 	else if (status & USB_TD_RX_ER_BITSTUFF)
36 		return -EPROTO;
37 	else if (status & USB_TD_RX_ER_PID)
38 		return -EILSEQ;
39 	else if (status & (USB_TD_TX_ER_NAK | USB_TD_TX_ER_TIMEOUT))
40 		return -ETIMEDOUT;
41 	else if (status & USB_TD_TX_ER_STALL)
42 		return -EPIPE;
43 	else if (status & USB_TD_TX_ER_UNDERUN)
44 		return -ENOSR;
45 	else if (status & USB_TD_RX_DATA_UNDERUN)
46 		return -EREMOTEIO;
47 	else if (status & USB_TD_RX_DATA_OVERUN)
48 		return -EOVERFLOW;
49 	else
50 		return -EINVAL;
51 }
52 
fhci_add_td_to_frame(struct fhci_time_frame * frame,struct td * td)53 void fhci_add_td_to_frame(struct fhci_time_frame *frame, struct td *td)
54 {
55 	list_add_tail(&td->frame_lh, &frame->tds_list);
56 }
57 
fhci_add_tds_to_ed(struct ed * ed,struct td ** td_list,int number)58 void fhci_add_tds_to_ed(struct ed *ed, struct td **td_list, int number)
59 {
60 	int i;
61 
62 	for (i = 0; i < number; i++) {
63 		struct td *td = td_list[i];
64 		list_add_tail(&td->node, &ed->td_list);
65 	}
66 	if (ed->td_head == NULL)
67 		ed->td_head = td_list[0];
68 }
69 
peek_td_from_ed(struct ed * ed)70 static struct td *peek_td_from_ed(struct ed *ed)
71 {
72 	struct td *td;
73 
74 	if (!list_empty(&ed->td_list))
75 		td = list_entry(ed->td_list.next, struct td, node);
76 	else
77 		td = NULL;
78 
79 	return td;
80 }
81 
fhci_remove_td_from_frame(struct fhci_time_frame * frame)82 struct td *fhci_remove_td_from_frame(struct fhci_time_frame *frame)
83 {
84 	struct td *td;
85 
86 	if (!list_empty(&frame->tds_list)) {
87 		td = list_entry(frame->tds_list.next, struct td, frame_lh);
88 		list_del_init(frame->tds_list.next);
89 	} else
90 		td = NULL;
91 
92 	return td;
93 }
94 
fhci_peek_td_from_frame(struct fhci_time_frame * frame)95 struct td *fhci_peek_td_from_frame(struct fhci_time_frame *frame)
96 {
97 	struct td *td;
98 
99 	if (!list_empty(&frame->tds_list))
100 		td = list_entry(frame->tds_list.next, struct td, frame_lh);
101 	else
102 		td = NULL;
103 
104 	return td;
105 }
106 
fhci_remove_td_from_ed(struct ed * ed)107 struct td *fhci_remove_td_from_ed(struct ed *ed)
108 {
109 	struct td *td;
110 
111 	if (!list_empty(&ed->td_list)) {
112 		td = list_entry(ed->td_list.next, struct td, node);
113 		list_del_init(ed->td_list.next);
114 
115 		/* if this TD was the ED's head, find next TD */
116 		if (!list_empty(&ed->td_list))
117 			ed->td_head = list_entry(ed->td_list.next, struct td,
118 						 node);
119 		else
120 			ed->td_head = NULL;
121 	} else
122 		td = NULL;
123 
124 	return td;
125 }
126 
fhci_remove_td_from_done_list(struct fhci_controller_list * p_list)127 struct td *fhci_remove_td_from_done_list(struct fhci_controller_list *p_list)
128 {
129 	struct td *td;
130 
131 	if (!list_empty(&p_list->done_list)) {
132 		td = list_entry(p_list->done_list.next, struct td, node);
133 		list_del_init(p_list->done_list.next);
134 	} else
135 		td = NULL;
136 
137 	return td;
138 }
139 
fhci_move_td_from_ed_to_done_list(struct fhci_usb * usb,struct ed * ed)140 void fhci_move_td_from_ed_to_done_list(struct fhci_usb *usb, struct ed *ed)
141 {
142 	struct td *td;
143 
144 	td = ed->td_head;
145 	list_del_init(&td->node);
146 
147 	/* If this TD was the ED's head,find next TD */
148 	if (!list_empty(&ed->td_list))
149 		ed->td_head = list_entry(ed->td_list.next, struct td, node);
150 	else {
151 		ed->td_head = NULL;
152 		ed->state = FHCI_ED_SKIP;
153 	}
154 	ed->toggle_carry = td->toggle;
155 	list_add_tail(&td->node, &usb->hc_list->done_list);
156 	if (td->ioc)
157 		usb->transfer_confirm(usb->fhci);
158 }
159 
160 /* free done FHCI URB resource such as ED and TD */
free_urb_priv(struct fhci_hcd * fhci,struct urb * urb)161 static void free_urb_priv(struct fhci_hcd *fhci, struct urb *urb)
162 {
163 	int i;
164 	struct urb_priv *urb_priv = urb->hcpriv;
165 	struct ed *ed = urb_priv->ed;
166 
167 	for (i = 0; i < urb_priv->num_of_tds; i++) {
168 		list_del_init(&urb_priv->tds[i]->node);
169 		fhci_recycle_empty_td(fhci, urb_priv->tds[i]);
170 	}
171 
172 	/* if this TD was the ED's head,find the next TD */
173 	if (!list_empty(&ed->td_list))
174 		ed->td_head = list_entry(ed->td_list.next, struct td, node);
175 	else
176 		ed->td_head = NULL;
177 
178 	kfree(urb_priv->tds);
179 	kfree(urb_priv);
180 	urb->hcpriv = NULL;
181 
182 	/* if this TD was the ED's head,find next TD */
183 	if (ed->td_head == NULL)
184 		list_del_init(&ed->node);
185 	fhci->active_urbs--;
186 }
187 
188 /* this routine called to complete and free done URB */
fhci_urb_complete_free(struct fhci_hcd * fhci,struct urb * urb)189 void fhci_urb_complete_free(struct fhci_hcd *fhci, struct urb *urb)
190 {
191 	free_urb_priv(fhci, urb);
192 
193 	if (urb->status == -EINPROGRESS) {
194 		if (urb->actual_length != urb->transfer_buffer_length &&
195 				urb->transfer_flags & URB_SHORT_NOT_OK)
196 			urb->status = -EREMOTEIO;
197 		else
198 			urb->status = 0;
199 	}
200 
201 	usb_hcd_unlink_urb_from_ep(fhci_to_hcd(fhci), urb);
202 
203 	spin_unlock(&fhci->lock);
204 
205 	usb_hcd_giveback_urb(fhci_to_hcd(fhci), urb, urb->status);
206 
207 	spin_lock(&fhci->lock);
208 }
209 
210 /*
211  * caculate transfer length/stats and update the urb
212  * Precondition: irqsafe(only for urb-?status locking)
213  */
fhci_done_td(struct urb * urb,struct td * td)214 void fhci_done_td(struct urb *urb, struct td *td)
215 {
216 	struct ed *ed = td->ed;
217 	u32 cc = td->status;
218 
219 	/* ISO...drivers see per-TD length/status */
220 	if (ed->mode == FHCI_TF_ISO) {
221 		u32 len;
222 		if (!(urb->transfer_flags & URB_SHORT_NOT_OK &&
223 				cc == USB_TD_RX_DATA_UNDERUN))
224 			cc = USB_TD_OK;
225 
226 		if (usb_pipeout(urb->pipe))
227 			len = urb->iso_frame_desc[td->iso_index].length;
228 		else
229 			len = td->actual_len;
230 
231 		urb->actual_length += len;
232 		urb->iso_frame_desc[td->iso_index].actual_length = len;
233 		urb->iso_frame_desc[td->iso_index].status =
234 			status_to_error(cc);
235 	}
236 
237 	/* BULK,INT,CONTROL... drivers see aggregate length/status,
238 	 * except that "setup" bytes aren't counted and "short" transfers
239 	 * might not be reported as errors.
240 	 */
241 	else {
242 		if (td->error_cnt >= 3)
243 			urb->error_count = 3;
244 
245 		/* control endpoint only have soft stalls */
246 
247 		/* update packet status if needed(short may be ok) */
248 		if (!(urb->transfer_flags & URB_SHORT_NOT_OK) &&
249 				cc == USB_TD_RX_DATA_UNDERUN) {
250 			ed->state = FHCI_ED_OPER;
251 			cc = USB_TD_OK;
252 		}
253 		if (cc != USB_TD_OK) {
254 			if (urb->status == -EINPROGRESS)
255 				urb->status = status_to_error(cc);
256 		}
257 
258 		/* count all non-empty packets except control SETUP packet */
259 		if (td->type != FHCI_TA_SETUP || td->iso_index != 0)
260 			urb->actual_length += td->actual_len;
261 	}
262 }
263 
264 /* there are some pedning request to unlink */
fhci_del_ed_list(struct fhci_hcd * fhci,struct ed * ed)265 void fhci_del_ed_list(struct fhci_hcd *fhci, struct ed *ed)
266 {
267 	struct td *td = peek_td_from_ed(ed);
268 	struct urb *urb = td->urb;
269 	struct urb_priv *urb_priv = urb->hcpriv;
270 
271 	if (urb_priv->state == URB_DEL) {
272 		td = fhci_remove_td_from_ed(ed);
273 		/* HC may have partly processed this TD */
274 		if (td->status != USB_TD_INPROGRESS)
275 			fhci_done_td(urb, td);
276 
277 		/* URB is done;clean up */
278 		if (++(urb_priv->tds_cnt) == urb_priv->num_of_tds)
279 			fhci_urb_complete_free(fhci, urb);
280 	}
281 }
282