2 * Copyright © 2012 Keith Packard <keithp@keithp.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 #include "ao_product.h"
24 #define USB_DEBUG_DATA 0
28 #define USE_USB_STDIO 1
32 #define AO_USB_OUT_SLEEP_ADDR (&ao_stdin_ready)
34 #define AO_USB_OUT_SLEEP_ADDR (&ao_usb_out_avail)
38 #define debug(format, args...) printf(format, ## args);
40 #define debug(format, args...)
44 #define debug_data(format, args...) printf(format, ## args);
46 #define debug_data(format, args...)
50 uint8_t dir_type_recip;
57 static uint8_t ao_usb_ep0_state;
59 /* Pending EP0 IN data */
60 static const uint8_t *ao_usb_ep0_in_data; /* Remaining data */
61 static uint8_t ao_usb_ep0_in_len; /* Remaining amount */
63 /* Temp buffer for smaller EP0 in data */
64 static uint8_t ao_usb_ep0_in_buf[2];
66 /* Pending EP0 OUT data */
67 static uint8_t *ao_usb_ep0_out_data;
68 static uint8_t ao_usb_ep0_out_len;
71 * Objects allocated in special USB memory
74 /* Buffer description tables */
75 static union stm_usb_bdt *ao_usb_bdt;
76 /* USB address of end of allocated storage */
77 static uint16_t ao_usb_sram_addr;
79 /* Pointer to ep0 tx/rx buffers in USB memory */
80 static uint32_t *ao_usb_ep0_tx_buffer;
81 static uint32_t *ao_usb_ep0_rx_buffer;
83 /* Pointer to bulk data tx/rx buffers in USB memory */
84 static uint32_t *ao_usb_in_tx_buffer;
85 static uint32_t *ao_usb_out_rx_buffer;
87 /* System ram shadow of USB buffer; writing individual bytes is
88 * too much of a pain (sigh) */
89 static uint8_t ao_usb_tx_buffer[AO_USB_IN_SIZE];
90 static uint8_t ao_usb_tx_count;
92 static uint8_t ao_usb_rx_buffer[AO_USB_OUT_SIZE];
93 static uint8_t ao_usb_rx_count, ao_usb_rx_pos;
96 * End point register indices
99 #define AO_USB_CONTROL_EPR 0
100 #define AO_USB_INT_EPR 1
101 #define AO_USB_OUT_EPR 2
102 #define AO_USB_IN_EPR 3
104 /* Marks when we don't need to send an IN packet.
105 * This happens only when the last IN packet is not full,
106 * otherwise the host will expect to keep seeing packets.
107 * Send a zero-length packet as required
109 static uint8_t ao_usb_in_flushed;
111 /* Marks when we have delivered an IN packet to the hardware
112 * and it has not been received yet. ao_sleep on this address
113 * to wait for it to be delivered.
115 static uint8_t ao_usb_in_pending;
117 /* Marks when an OUT packet has been received by the hardware
118 * but not pulled to the shadow buffer.
120 static uint8_t ao_usb_out_avail;
121 uint8_t ao_usb_running;
122 static uint8_t ao_usb_configuration;
124 #define AO_USB_EP0_GOT_RESET 1
125 #define AO_USB_EP0_GOT_SETUP 2
126 #define AO_USB_EP0_GOT_RX_DATA 4
127 #define AO_USB_EP0_GOT_TX_ACK 8
129 static uint8_t ao_usb_ep0_receive;
130 static uint8_t ao_usb_address;
131 static uint8_t ao_usb_address_pending;
133 static inline uint32_t set_toggle(uint32_t current_value,
135 uint32_t desired_value)
137 return (current_value ^ desired_value) & mask;
140 static inline uint32_t *ao_usb_packet_buffer_addr(uint16_t sram_addr)
142 return (uint32_t *) (stm_usb_sram + 2 * sram_addr);
145 static inline uint32_t ao_usb_epr_stat_rx(uint32_t epr) {
146 return (epr >> STM_USB_EPR_STAT_RX) & STM_USB_EPR_STAT_RX_MASK;
149 static inline uint32_t ao_usb_epr_stat_tx(uint32_t epr) {
150 return (epr >> STM_USB_EPR_STAT_TX) & STM_USB_EPR_STAT_TX_MASK;
153 static inline uint32_t ao_usb_epr_ctr_rx(uint32_t epr) {
154 return (epr >> STM_USB_EPR_CTR_RX) & 1;
157 static inline uint32_t ao_usb_epr_ctr_tx(uint32_t epr) {
158 return (epr >> STM_USB_EPR_CTR_TX) & 1;
161 static inline uint32_t ao_usb_epr_setup(uint32_t epr) {
162 return (epr >> STM_USB_EPR_SETUP) & 1;
165 static inline uint32_t ao_usb_epr_dtog_rx(uint32_t epr) {
166 return (epr >> STM_USB_EPR_DTOG_RX) & 1;
169 static inline uint32_t ao_usb_epr_dtog_tx(uint32_t epr) {
170 return (epr >> STM_USB_EPR_DTOG_TX) & 1;
174 * Set current device address and mark the
175 * interface as active
178 ao_usb_set_address(uint8_t address)
180 debug("ao_usb_set_address %02x\n", address);
181 stm_usb.daddr = (1 << STM_USB_DADDR_EF) | address;
182 ao_usb_address_pending = 0;
186 * Write these values to preserve register contents under HW changes
189 #define STM_USB_EPR_INVARIANT ((1 << STM_USB_EPR_CTR_RX) | \
190 (STM_USB_EPR_DTOG_RX_WRITE_INVARIANT << STM_USB_EPR_DTOG_RX) | \
191 (STM_USB_EPR_STAT_RX_WRITE_INVARIANT << STM_USB_EPR_STAT_RX) | \
192 (1 << STM_USB_EPR_CTR_TX) | \
193 (STM_USB_EPR_DTOG_TX_WRITE_INVARIANT << STM_USB_EPR_DTOG_TX) | \
194 (STM_USB_EPR_STAT_TX_WRITE_INVARIANT << STM_USB_EPR_STAT_TX))
196 #define STM_USB_EPR_INVARIANT_MASK ((1 << STM_USB_EPR_CTR_RX) | \
197 (STM_USB_EPR_DTOG_RX_MASK << STM_USB_EPR_DTOG_RX) | \
198 (STM_USB_EPR_STAT_RX_MASK << STM_USB_EPR_STAT_RX) | \
199 (1 << STM_USB_EPR_CTR_TX) | \
200 (STM_USB_EPR_DTOG_TX_MASK << STM_USB_EPR_DTOG_TX) | \
201 (STM_USB_EPR_STAT_TX_MASK << STM_USB_EPR_STAT_TX))
204 * These bits are purely under sw control, so preserve them in the
205 * register by re-writing what was read
207 #define STM_USB_EPR_PRESERVE_MASK ((STM_USB_EPR_EP_TYPE_MASK << STM_USB_EPR_EP_TYPE) | \
208 (1 << STM_USB_EPR_EP_KIND) | \
209 (STM_USB_EPR_EA_MASK << STM_USB_EPR_EA))
215 #define _tx_dbg0(msg) _dbg(__LINE__,msg,0)
216 #define _tx_dbg1(msg,value) _dbg(__LINE__,msg,value)
218 #define _tx_dbg0(msg)
219 #define _tx_dbg1(msg,value)
223 #define _rx_dbg0(msg) _dbg(__LINE__,msg,0)
224 #define _rx_dbg1(msg,value) _dbg(__LINE__,msg,value)
226 #define _rx_dbg0(msg)
227 #define _rx_dbg1(msg,value)
231 static void _dbg(int line, char *msg, uint32_t value);
235 * Set the state of the specified endpoint register to a new
236 * value. This is tricky because the bits toggle where the new
237 * value is one, and we need to write invariant values in other
238 * spots of the register. This hardware is strange...
241 _ao_usb_set_stat_tx(int ep, uint32_t stat_tx)
243 uint32_t epr_write, epr_old;
245 _tx_dbg1("set_stat_tx top", stat_tx);
246 epr_old = epr_write = stm_usb.epr[ep];
247 epr_write &= STM_USB_EPR_PRESERVE_MASK;
248 epr_write |= STM_USB_EPR_INVARIANT;
249 epr_write |= set_toggle(epr_old,
250 STM_USB_EPR_STAT_TX_MASK << STM_USB_EPR_STAT_TX,
251 stat_tx << STM_USB_EPR_STAT_TX);
252 stm_usb.epr[ep] = epr_write;
253 _tx_dbg1("set_stat_tx bottom", epr_write);
257 ao_usb_set_stat_tx(int ep, uint32_t stat_tx)
259 ao_arch_block_interrupts();
260 _ao_usb_set_stat_tx(ep, stat_tx);
261 ao_arch_release_interrupts();
265 _ao_usb_set_stat_rx(int ep, uint32_t stat_rx) {
266 uint32_t epr_write, epr_old;
268 epr_write = epr_old = stm_usb.epr[ep];
269 epr_write &= STM_USB_EPR_PRESERVE_MASK;
270 epr_write |= STM_USB_EPR_INVARIANT;
271 epr_write |= set_toggle(epr_old,
272 STM_USB_EPR_STAT_RX_MASK << STM_USB_EPR_STAT_RX,
273 stat_rx << STM_USB_EPR_STAT_RX);
274 stm_usb.epr[ep] = epr_write;
278 ao_usb_set_stat_rx(int ep, uint32_t stat_rx) {
279 ao_arch_block_interrupts();
280 _ao_usb_set_stat_rx(ep, stat_rx);
281 ao_arch_release_interrupts();
285 * Set just endpoint 0, for use during startup
289 ao_usb_init_ep(uint8_t ep, uint32_t addr, uint32_t type, uint32_t stat_rx, uint32_t stat_tx)
292 ao_arch_block_interrupts();
293 epr = stm_usb.epr[ep];
294 epr = ((0 << STM_USB_EPR_CTR_RX) |
295 (epr & (1 << STM_USB_EPR_DTOG_RX)) |
297 (STM_USB_EPR_STAT_RX_MASK << STM_USB_EPR_STAT_RX),
298 (stat_rx << STM_USB_EPR_STAT_RX)) |
299 (type << STM_USB_EPR_EP_TYPE) |
300 (0 << STM_USB_EPR_EP_KIND) |
301 (0 << STM_USB_EPR_CTR_TX) |
302 (epr & (1 << STM_USB_EPR_DTOG_TX)) |
304 (STM_USB_EPR_STAT_TX_MASK << STM_USB_EPR_STAT_TX),
305 (stat_tx << STM_USB_EPR_STAT_TX)) |
306 (addr << STM_USB_EPR_EA));
307 stm_usb.epr[ep] = epr;
308 ao_arch_release_interrupts();
309 debug ("writing epr[%d] 0x%08x wrote 0x%08x\n",
310 ep, epr, stm_usb.epr[ep]);
318 ao_usb_sram_addr = 0;
320 /* buffer table is at the start of USB memory */
322 ao_usb_bdt = (void *) stm_usb_sram;
324 ao_usb_sram_addr += 8 * STM_USB_BDT_SIZE;
326 /* Set up EP 0 - a Control end point with 32 bytes of in and out buffers */
328 ao_usb_bdt[0].single.addr_tx = ao_usb_sram_addr;
329 ao_usb_bdt[0].single.count_tx = 0;
330 ao_usb_ep0_tx_buffer = ao_usb_packet_buffer_addr(ao_usb_sram_addr);
331 ao_usb_sram_addr += AO_USB_CONTROL_SIZE;
333 ao_usb_bdt[0].single.addr_rx = ao_usb_sram_addr;
334 ao_usb_bdt[0].single.count_rx = ((1 << STM_USB_BDT_COUNT_RX_BL_SIZE) |
335 (((AO_USB_CONTROL_SIZE / 32) - 1) << STM_USB_BDT_COUNT_RX_NUM_BLOCK));
336 ao_usb_ep0_rx_buffer = ao_usb_packet_buffer_addr(ao_usb_sram_addr);
337 ao_usb_sram_addr += AO_USB_CONTROL_SIZE;
339 ao_usb_init_ep(AO_USB_CONTROL_EPR, AO_USB_CONTROL_EP,
340 STM_USB_EPR_EP_TYPE_CONTROL,
341 STM_USB_EPR_STAT_RX_VALID,
342 STM_USB_EPR_STAT_TX_NAK);
344 /* Clear all of the other endpoints */
345 for (e = 1; e < 8; e++) {
347 STM_USB_EPR_EP_TYPE_CONTROL,
348 STM_USB_EPR_STAT_RX_DISABLED,
349 STM_USB_EPR_STAT_TX_DISABLED);
352 ao_usb_set_address(0);
356 /* Reset our internal state
359 ao_usb_ep0_state = AO_USB_EP0_IDLE;
361 ao_usb_ep0_in_data = NULL;
362 ao_usb_ep0_in_len = 0;
364 ao_usb_ep0_out_data = 0;
365 ao_usb_ep0_out_len = 0;
369 ao_usb_set_configuration(void)
371 debug ("ao_usb_set_configuration\n");
373 /* Set up the INT end point */
374 ao_usb_bdt[AO_USB_INT_EPR].single.addr_tx = ao_usb_sram_addr;
375 ao_usb_bdt[AO_USB_INT_EPR].single.count_tx = 0;
376 ao_usb_in_tx_buffer = ao_usb_packet_buffer_addr(ao_usb_sram_addr);
377 ao_usb_sram_addr += AO_USB_INT_SIZE;
379 ao_usb_init_ep(AO_USB_INT_EPR,
381 STM_USB_EPR_EP_TYPE_INTERRUPT,
382 STM_USB_EPR_STAT_RX_DISABLED,
383 STM_USB_EPR_STAT_TX_NAK);
385 /* Set up the OUT end point */
386 ao_usb_bdt[AO_USB_OUT_EPR].single.addr_rx = ao_usb_sram_addr;
387 ao_usb_bdt[AO_USB_OUT_EPR].single.count_rx = ((1 << STM_USB_BDT_COUNT_RX_BL_SIZE) |
388 (((AO_USB_OUT_SIZE / 32) - 1) << STM_USB_BDT_COUNT_RX_NUM_BLOCK));
389 ao_usb_out_rx_buffer = ao_usb_packet_buffer_addr(ao_usb_sram_addr);
390 ao_usb_sram_addr += AO_USB_OUT_SIZE;
392 ao_usb_init_ep(AO_USB_OUT_EPR,
394 STM_USB_EPR_EP_TYPE_BULK,
395 STM_USB_EPR_STAT_RX_VALID,
396 STM_USB_EPR_STAT_TX_DISABLED);
398 /* Set up the IN end point */
399 ao_usb_bdt[AO_USB_IN_EPR].single.addr_tx = ao_usb_sram_addr;
400 ao_usb_bdt[AO_USB_IN_EPR].single.count_tx = 0;
401 ao_usb_in_tx_buffer = ao_usb_packet_buffer_addr(ao_usb_sram_addr);
402 ao_usb_sram_addr += AO_USB_IN_SIZE;
404 ao_usb_init_ep(AO_USB_IN_EPR,
406 STM_USB_EPR_EP_TYPE_BULK,
407 STM_USB_EPR_STAT_RX_DISABLED,
408 STM_USB_EPR_STAT_TX_NAK);
410 ao_usb_in_flushed = 0;
411 ao_usb_in_pending = 0;
412 ao_wakeup(&ao_usb_in_pending);
414 ao_usb_out_avail = 0;
415 ao_usb_configuration = 0;
418 ao_wakeup(&ao_usb_running);
421 static uint16_t control_count;
422 static uint16_t int_count;
423 static uint16_t in_count;
424 static uint16_t out_count;
425 static uint16_t reset_count;
427 /* The USB memory holds 16 bit values on 32 bit boundaries
428 * and must be accessed only in 32 bit units. Sigh.
432 ao_usb_write_byte(uint8_t byte, uint32_t *base, uint16_t offset)
436 *base = (*base & 0xff) | ((uint32_t) byte << 8);
438 *base = (*base & 0xff00) | byte;
443 ao_usb_write_short(uint16_t data, uint32_t *base, uint16_t offset)
445 base[offset>>1] = data;
449 ao_usb_write(const uint8_t *src, uint32_t *base, uint16_t offset, uint16_t bytes)
454 debug_data (" %02x", src[0]);
455 ao_usb_write_byte(*src++, base, offset++);
459 debug_data (" %02x %02x", src[0], src[1]);
460 ao_usb_write_short((src[1] << 8) | src[0], base, offset);
466 debug_data (" %02x", src[0]);
467 ao_usb_write_byte(*src, base, offset);
471 static inline uint8_t
472 ao_usb_read_byte(uint32_t *base, uint16_t offset)
476 return (*base >> 8) & 0xff;
481 static inline uint16_t
482 ao_usb_read_short(uint32_t *base, uint16_t offset)
484 return base[offset>>1];
488 ao_usb_read(uint8_t *dst, uint32_t *base, uint16_t offset, uint16_t bytes)
493 *dst++ = ao_usb_read_byte(base, offset++);
494 debug_data (" %02x", dst[-1]);
498 uint16_t s = ao_usb_read_short(base, offset);
501 debug_data (" %02x %02x", dst[0], dst[1]);
507 *dst = ao_usb_read_byte(base, offset);
508 debug_data (" %02x", dst[0]);
512 /* Send an IN data packet */
514 ao_usb_ep0_flush(void)
518 /* Check to see if the endpoint is still busy */
519 if (ao_usb_epr_stat_tx(stm_usb.epr[0]) == STM_USB_EPR_STAT_TX_VALID) {
520 debug("EP0 not accepting IN data\n");
524 this_len = ao_usb_ep0_in_len;
525 if (this_len > AO_USB_CONTROL_SIZE)
526 this_len = AO_USB_CONTROL_SIZE;
528 if (this_len < AO_USB_CONTROL_SIZE)
529 ao_usb_ep0_state = AO_USB_EP0_IDLE;
531 ao_usb_ep0_in_len -= this_len;
533 debug_data ("Flush EP0 len %d:", this_len);
534 ao_usb_write(ao_usb_ep0_in_data, ao_usb_ep0_tx_buffer, 0, this_len);
536 ao_usb_ep0_in_data += this_len;
538 /* Mark the endpoint as TX valid to send the packet */
539 ao_usb_bdt[AO_USB_CONTROL_EPR].single.count_tx = this_len;
540 ao_usb_set_stat_tx(AO_USB_CONTROL_EPR, STM_USB_EPR_STAT_TX_VALID);
541 debug ("queue tx. epr 0 now %08x\n", stm_usb.epr[AO_USB_CONTROL_EPR]);
544 /* Read data from the ep0 OUT fifo */
546 ao_usb_ep0_fill(void)
548 uint16_t len = ao_usb_bdt[0].single.count_rx & STM_USB_BDT_COUNT_RX_COUNT_RX_MASK;
550 if (len > ao_usb_ep0_out_len)
551 len = ao_usb_ep0_out_len;
552 ao_usb_ep0_out_len -= len;
554 /* Pull all of the data out of the packet */
555 debug_data ("Fill EP0 len %d:", len);
556 ao_usb_read(ao_usb_ep0_out_data, ao_usb_ep0_rx_buffer, 0, len);
558 ao_usb_ep0_out_data += len;
561 ao_usb_set_stat_rx(0, STM_USB_EPR_STAT_RX_VALID);
565 ao_usb_ep0_in_reset(void)
567 ao_usb_ep0_in_data = ao_usb_ep0_in_buf;
568 ao_usb_ep0_in_len = 0;
572 ao_usb_ep0_in_queue_byte(uint8_t a)
574 if (ao_usb_ep0_in_len < sizeof (ao_usb_ep0_in_buf))
575 ao_usb_ep0_in_buf[ao_usb_ep0_in_len++] = a;
579 ao_usb_ep0_in_set(const uint8_t *data, uint8_t len)
581 ao_usb_ep0_in_data = data;
582 ao_usb_ep0_in_len = len;
586 ao_usb_ep0_out_set(uint8_t *data, uint8_t len)
588 ao_usb_ep0_out_data = data;
589 ao_usb_ep0_out_len = len;
593 ao_usb_ep0_in_start(uint16_t max)
595 /* Don't send more than asked for */
596 if (ao_usb_ep0_in_len > max)
597 ao_usb_ep0_in_len = max;
601 static struct ao_usb_line_coding ao_usb_line_coding = {115200, 0, 0, 8};
603 /* Walk through the list of descriptors and find a match
606 ao_usb_get_descriptor(uint16_t value, uint16_t length)
608 const uint8_t *descriptor;
609 uint8_t type = value >> 8;
610 uint8_t index = value;
612 descriptor = ao_usb_descriptors;
613 while (descriptor[0] != 0) {
614 if (descriptor[1] == type && index-- == 0) {
616 if (type == AO_USB_DESC_CONFIGURATION)
622 ao_usb_ep0_in_set(descriptor, len);
625 descriptor += descriptor[0];
630 ao_usb_ep0_setup(void)
632 /* Pull the setup packet out of the fifo */
633 ao_usb_ep0_out_set((uint8_t *) &ao_usb_setup, 8);
635 if (ao_usb_ep0_out_len != 0) {
636 debug ("invalid setup packet length\n");
640 if ((ao_usb_setup.dir_type_recip & AO_USB_DIR_IN) || ao_usb_setup.length == 0)
641 ao_usb_ep0_state = AO_USB_EP0_DATA_IN;
643 ao_usb_ep0_state = AO_USB_EP0_DATA_OUT;
645 ao_usb_ep0_in_reset();
647 switch(ao_usb_setup.dir_type_recip & AO_USB_SETUP_TYPE_MASK) {
648 case AO_USB_TYPE_STANDARD:
649 debug ("Standard setup packet\n");
650 switch(ao_usb_setup.dir_type_recip & AO_USB_SETUP_RECIP_MASK) {
651 case AO_USB_RECIP_DEVICE:
652 debug ("Device setup packet\n");
653 switch(ao_usb_setup.request) {
654 case AO_USB_REQ_GET_STATUS:
655 debug ("get status\n");
656 ao_usb_ep0_in_queue_byte(0);
657 ao_usb_ep0_in_queue_byte(0);
659 case AO_USB_REQ_SET_ADDRESS:
660 debug ("set address %d\n", ao_usb_setup.value);
661 ao_usb_address = ao_usb_setup.value;
662 ao_usb_address_pending = 1;
664 case AO_USB_REQ_GET_DESCRIPTOR:
665 debug ("get descriptor %d\n", ao_usb_setup.value);
666 ao_usb_get_descriptor(ao_usb_setup.value, ao_usb_setup.length);
668 case AO_USB_REQ_GET_CONFIGURATION:
669 debug ("get configuration %d\n", ao_usb_configuration);
670 ao_usb_ep0_in_queue_byte(ao_usb_configuration);
672 case AO_USB_REQ_SET_CONFIGURATION:
673 ao_usb_configuration = ao_usb_setup.value;
674 debug ("set configuration %d\n", ao_usb_configuration);
675 ao_usb_set_configuration();
679 case AO_USB_RECIP_INTERFACE:
680 debug ("Interface setup packet\n");
681 switch(ao_usb_setup.request) {
682 case AO_USB_REQ_GET_STATUS:
683 ao_usb_ep0_in_queue_byte(0);
684 ao_usb_ep0_in_queue_byte(0);
686 case AO_USB_REQ_GET_INTERFACE:
687 ao_usb_ep0_in_queue_byte(0);
689 case AO_USB_REQ_SET_INTERFACE:
693 case AO_USB_RECIP_ENDPOINT:
694 debug ("Endpoint setup packet\n");
695 switch(ao_usb_setup.request) {
696 case AO_USB_REQ_GET_STATUS:
697 ao_usb_ep0_in_queue_byte(0);
698 ao_usb_ep0_in_queue_byte(0);
704 case AO_USB_TYPE_CLASS:
705 debug ("Class setup packet\n");
706 switch (ao_usb_setup.request) {
707 case AO_USB_SET_LINE_CODING:
708 debug ("set line coding\n");
709 ao_usb_ep0_out_set((uint8_t *) &ao_usb_line_coding, 7);
711 case AO_USB_GET_LINE_CODING:
712 debug ("get line coding\n");
713 ao_usb_ep0_in_set((const uint8_t *) &ao_usb_line_coding, 7);
715 case AO_USB_SET_CONTROL_LINE_STATE:
721 /* If we're not waiting to receive data from the host,
722 * queue an IN response
724 if (ao_usb_ep0_state == AO_USB_EP0_DATA_IN)
725 ao_usb_ep0_in_start(ao_usb_setup.length);
729 ao_usb_ep0_handle(uint8_t receive)
731 ao_usb_ep0_receive = 0;
732 if (receive & AO_USB_EP0_GOT_RESET) {
737 if (receive & AO_USB_EP0_GOT_SETUP) {
741 if (receive & AO_USB_EP0_GOT_RX_DATA) {
742 debug ("\tgot rx data\n");
743 if (ao_usb_ep0_state == AO_USB_EP0_DATA_OUT) {
745 if (ao_usb_ep0_out_len == 0) {
746 ao_usb_ep0_state = AO_USB_EP0_DATA_IN;
747 ao_usb_ep0_in_start(0);
751 if (receive & AO_USB_EP0_GOT_TX_ACK) {
752 debug ("\tgot tx ack\n");
754 #if HAS_FLIGHT && AO_USB_FORCE_IDLE
755 ao_flight_force_idle = 1;
757 /* Wait until the IN packet is received from addr 0
758 * before assigning our local address
760 if (ao_usb_address_pending)
761 ao_usb_set_address(ao_usb_address);
762 if (ao_usb_ep0_state == AO_USB_EP0_DATA_IN)
770 uint32_t istr = stm_usb.istr;
772 if (istr & (1 << STM_USB_ISTR_CTR)) {
773 uint8_t ep = istr & STM_USB_ISTR_EP_ID_MASK;
774 uint32_t epr, epr_write;
776 /* Preserve the SW write bits, don't mess with most HW writable bits,
777 * clear the CTR_RX and CTR_TX bits
779 epr = stm_usb.epr[ep];
781 epr_write &= STM_USB_EPR_PRESERVE_MASK;
782 epr_write |= STM_USB_EPR_INVARIANT;
783 epr_write &= ~(1 << STM_USB_EPR_CTR_RX);
784 epr_write &= ~(1 << STM_USB_EPR_CTR_TX);
785 stm_usb.epr[ep] = epr_write;
790 if (ao_usb_epr_ctr_rx(epr)) {
791 if (ao_usb_epr_setup(epr))
792 ao_usb_ep0_receive |= AO_USB_EP0_GOT_SETUP;
794 ao_usb_ep0_receive |= AO_USB_EP0_GOT_RX_DATA;
796 if (ao_usb_epr_ctr_tx(epr))
797 ao_usb_ep0_receive |= AO_USB_EP0_GOT_TX_ACK;
798 ao_usb_ep0_handle(ao_usb_ep0_receive);
802 if (ao_usb_epr_ctr_rx(epr)) {
803 _rx_dbg1("RX ISR", epr);
804 ao_usb_out_avail = 1;
805 _rx_dbg0("out avail set");
806 ao_wakeup(AO_USB_OUT_SLEEP_ADDR);
807 _rx_dbg0("stdin awoken");
812 _tx_dbg1("TX ISR", epr);
813 if (ao_usb_epr_ctr_tx(epr)) {
814 ao_usb_in_pending = 0;
815 ao_wakeup(&ao_usb_in_pending);
820 if (ao_usb_epr_ctr_tx(epr))
821 _ao_usb_set_stat_tx(AO_USB_INT_EPR, STM_USB_EPR_STAT_TX_NAK);
827 if (istr & (1 << STM_USB_ISTR_RESET)) {
829 stm_usb.istr &= ~(1 << STM_USB_ISTR_RESET);
830 ao_usb_ep0_receive |= AO_USB_EP0_GOT_RESET;
831 ao_usb_ep0_handle(ao_usb_ep0_receive);
836 stm_usb_fs_wkup(void)
838 /* USB wakeup, just clear the bit for now */
839 stm_usb.istr &= ~(1 << STM_USB_ISTR_WKUP);
842 /* Queue the current IN buffer for transmission */
844 _ao_usb_in_send(void)
846 _tx_dbg0("in_send start");
847 debug ("send %d\n", ao_usb_tx_count);
848 while (ao_usb_in_pending)
849 ao_sleep(&ao_usb_in_pending);
850 ao_usb_in_pending = 1;
851 if (ao_usb_tx_count != AO_USB_IN_SIZE)
852 ao_usb_in_flushed = 1;
853 ao_usb_write(ao_usb_tx_buffer, ao_usb_in_tx_buffer, 0, ao_usb_tx_count);
854 ao_usb_bdt[AO_USB_IN_EPR].single.count_tx = ao_usb_tx_count;
856 _ao_usb_set_stat_tx(AO_USB_IN_EPR, STM_USB_EPR_STAT_TX_VALID);
857 _tx_dbg0("in_send end");
860 /* Wait for a free IN buffer. Interrupts are blocked */
862 _ao_usb_in_wait(void)
865 /* Check if the current buffer is writable */
866 if (ao_usb_tx_count < AO_USB_IN_SIZE)
869 _tx_dbg0("in_wait top");
870 /* Wait for an IN buffer to be ready */
871 while (ao_usb_in_pending)
872 ao_sleep(&ao_usb_in_pending);
873 _tx_dbg0("in_wait bottom");
883 /* Anytime we've sent a character since
884 * the last time we flushed, we'll need
885 * to send a packet -- the only other time
886 * we would send a packet is when that
887 * packet was full, in which case we now
888 * want to send an empty packet
890 ao_arch_block_interrupts();
891 while (!ao_usb_in_flushed) {
892 _tx_dbg0("flush top");
894 _tx_dbg0("flush end");
896 ao_arch_release_interrupts();
900 ao_usb_putchar(char c)
905 ao_arch_block_interrupts();
908 ao_usb_in_flushed = 0;
909 ao_usb_tx_buffer[ao_usb_tx_count++] = (uint8_t) c;
911 /* Send the packet when full */
912 if (ao_usb_tx_count == AO_USB_IN_SIZE) {
913 _tx_dbg0("putchar full");
915 _tx_dbg0("putchar flushed");
917 ao_arch_release_interrupts();
921 _ao_usb_out_recv(void)
923 _rx_dbg0("out_recv top");
924 ao_usb_out_avail = 0;
926 ao_usb_rx_count = ao_usb_bdt[AO_USB_OUT_EPR].single.count_rx & STM_USB_BDT_COUNT_RX_COUNT_RX_MASK;
928 _rx_dbg1("out_recv count", ao_usb_rx_count);
929 debug ("recv %d\n", ao_usb_rx_count);
930 debug_data("Fill OUT len %d:", ao_usb_rx_count);
931 ao_usb_read(ao_usb_rx_buffer, ao_usb_out_rx_buffer, 0, ao_usb_rx_count);
936 _ao_usb_set_stat_rx(AO_USB_OUT_EPR, STM_USB_EPR_STAT_RX_VALID);
940 _ao_usb_pollchar(void)
945 return AO_READ_AGAIN;
948 if (ao_usb_rx_pos != ao_usb_rx_count)
951 _rx_dbg0("poll check");
952 /* Check to see if a packet has arrived */
953 if (!ao_usb_out_avail) {
954 _rx_dbg0("poll none");
955 return AO_READ_AGAIN;
960 /* Pull a character out of the fifo */
961 c = ao_usb_rx_buffer[ao_usb_rx_pos++];
970 ao_arch_block_interrupts();
971 while ((c = _ao_usb_pollchar()) == AO_READ_AGAIN)
972 ao_sleep(AO_USB_OUT_SLEEP_ADDR);
973 ao_arch_release_interrupts();
980 ao_arch_block_interrupts();
981 stm_usb.cntr = (1 << STM_USB_CNTR_FRES);
984 /* Disable USB pull-up */
985 stm_syscfg.pmc &= ~(1 << STM_SYSCFG_PMC_USB_PU);
987 /* Switch off the device */
988 stm_usb.cntr = (1 << STM_USB_CNTR_PDWN) | (1 << STM_USB_CNTR_FRES);
990 /* Disable the interface */
991 stm_rcc.apb1enr &= ~(1 << STM_RCC_APB1ENR_USBEN);
992 ao_arch_release_interrupts();
1001 stm_rcc.apb2enr |= (1 << STM_RCC_APB2ENR_SYSCFGEN);
1003 /* Disable USB pull-up */
1004 stm_syscfg.pmc &= ~(1 << STM_SYSCFG_PMC_USB_PU);
1006 /* Enable USB device */
1007 stm_rcc.apb1enr |= (1 << STM_RCC_APB1ENR_USBEN);
1009 /* Do not touch the GPIOA configuration; USB takes priority
1010 * over GPIO on pins A11 and A12, but if you select alternate
1011 * input 10 (the documented correct selection), then USB is
1012 * pulled low and doesn't work at all
1015 ao_arch_block_interrupts();
1017 /* Route interrupts */
1018 stm_nvic_set_priority(STM_ISR_USB_LP_POS, 3);
1019 stm_nvic_set_enable(STM_ISR_USB_LP_POS);
1021 ao_usb_configuration = 0;
1023 stm_usb.cntr = (1 << STM_USB_CNTR_FRES);
1025 /* Clear the power down bit */
1028 /* Clear any spurious interrupts */
1031 debug ("ao_usb_enable\n");
1033 /* Enable interrupts */
1034 stm_usb.cntr = ((1 << STM_USB_CNTR_CTRM) |
1035 (0 << STM_USB_CNTR_PMAOVRM) |
1036 (0 << STM_USB_CNTR_ERRM) |
1037 (0 << STM_USB_CNTR_WKUPM) |
1038 (0 << STM_USB_CNTR_SUSPM) |
1039 (1 << STM_USB_CNTR_RESETM) |
1040 (0 << STM_USB_CNTR_SOFM) |
1041 (0 << STM_USB_CNTR_ESOFM) |
1042 (0 << STM_USB_CNTR_RESUME) |
1043 (0 << STM_USB_CNTR_FSUSP) |
1044 (0 << STM_USB_CNTR_LP_MODE) |
1045 (0 << STM_USB_CNTR_PDWN) |
1046 (0 << STM_USB_CNTR_FRES));
1048 ao_arch_release_interrupts();
1050 for (t = 0; t < 1000; t++)
1052 /* Enable USB pull-up */
1053 stm_syscfg.pmc |= (1 << STM_SYSCFG_PMC_USB_PU);
1057 struct ao_task ao_usb_echo_task;
1065 c = ao_usb_getchar();
1076 printf ("control: %d out: %d in: %d int: %d reset: %d\n",
1077 control_count, out_count, in_count, int_count, reset_count);
1080 __code struct ao_cmds ao_usb_cmds[] = {
1081 { ao_usb_irq, "I\0Show USB interrupt counts" },
1091 debug ("ao_usb_init\n");
1092 ao_usb_ep0_state = AO_USB_EP0_IDLE;
1094 ao_add_task(&ao_usb_echo_task, ao_usb_echo, "usb echo");
1097 ao_cmd_register(&ao_usb_cmds[0]);
1101 ao_add_stdio(_ao_usb_pollchar, ao_usb_putchar, ao_usb_flush);
1106 #if TX_DBG || RX_DBG
1116 uint32_t in_pending;
1118 uint32_t in_flushed;
1128 #define NUM_USB_DBG 128
1130 static struct ao_usb_dbg dbg[128];
1133 static void _dbg(int line, char *msg, uint32_t value)
1136 dbg[dbg_i].line = line;
1137 dbg[dbg_i].msg = msg;
1138 dbg[dbg_i].value = value;
1139 asm("mrs %0,primask" : "=&r" (primask));
1140 dbg[dbg_i].primask = primask;
1142 dbg[dbg_i].in_count = in_count;
1143 dbg[dbg_i].in_epr = stm_usb.epr[AO_USB_IN_EPR];
1144 dbg[dbg_i].in_pending = ao_usb_in_pending;
1145 dbg[dbg_i].tx_count = ao_usb_tx_count;
1146 dbg[dbg_i].in_flushed = ao_usb_in_flushed;
1149 dbg[dbg_i].rx_count = ao_usb_rx_count;
1150 dbg[dbg_i].rx_pos = ao_usb_rx_pos;
1151 dbg[dbg_i].out_avail = ao_usb_out_avail;
1152 dbg[dbg_i].out_epr = stm_usb.epr[AO_USB_OUT_EPR];
1154 if (++dbg_i == NUM_USB_DBG)