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usb-dwc: handle any-aligned buffers

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This is required to support armv6m targets using this code.
This commit is contained in:
Sebastian Holzapfel 2018-02-13 08:37:24 +11:00 committed by Karl Palsson
parent a2ee90fbfe
commit a0669421e1
1 changed files with 49 additions and 1 deletions
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50
lib/usb/usb_dwc_common.c
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@ -194,6 +194,10 @@ uint16_t dwc_ep_write_packet(usbd_device *usbd_dev, uint8_t addr,
const void *buf, uint16_t len)
{
const uint32_t *buf32 = buf;
#if defined(__ARM_ARCH_6M__)
const uint8_t *buf8 = buf;
uint32_t word32;
#endif /* defined(__ARM_ARCH_6M__) */
int i;
addr &= 0x7F;
@ -208,10 +212,28 @@ uint16_t dwc_ep_write_packet(usbd_device *usbd_dev, uint8_t addr,
REBASE(OTG_DIEPCTL(addr)) |= OTG_DIEPCTL0_EPENA |
OTG_DIEPCTL0_CNAK;
/* Copy buffer to endpoint FIFO, note - memcpy does not work */
/* Copy buffer to endpoint FIFO, note - memcpy does not work.
* ARMv7M supports non-word-aligned accesses, ARMv6M does not. */
#if defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__)
for (i = len; i > 0; i -= 4) {
REBASE(OTG_FIFO(addr)) = *buf32++;
}
#endif /* defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__) */
#if defined(__ARM_ARCH_6M__)
/* Take care of word-aligned and non-word-aligned buffers */
if (((uint32_t)buf8 & 0x3) == 0) {
for (i = len; i > 0; i -= 4) {
REBASE(OTG_FIFO(addr)) = *buf32++;
}
} else {
for (i = len; i > 0; i -= 4) {
memcpy(&word32, buf8, 4);
REBASE(OTG_FIFO(addr)) = word32;
buf8 += 4;
}
}
#endif /* defined(__ARM_ARCH_6M__) */
return len;
}
@ -221,6 +243,10 @@ uint16_t dwc_ep_read_packet(usbd_device *usbd_dev, uint8_t addr,
{
int i;
uint32_t *buf32 = buf;
#if defined(__ARM_ARCH_6M__)
uint8_t *buf8 = buf;
uint32_t word32;
#endif /* defined(__ARM_ARCH_6M__) */
uint32_t extra;
/* We do not need to know the endpoint address since there is only one
@ -229,10 +255,32 @@ uint16_t dwc_ep_read_packet(usbd_device *usbd_dev, uint8_t addr,
(void) addr;
len = MIN(len, usbd_dev->rxbcnt);
/* ARMv7M supports non-word-aligned accesses, ARMv6M does not. */
#if defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__)
for (i = len; i >= 4; i -= 4) {
*buf32++ = REBASE(OTG_FIFO(0));
usbd_dev->rxbcnt -= 4;
}
#endif /* defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__) */
#if defined(__ARM_ARCH_6M__)
/* Take care of word-aligned and non-word-aligned buffers */
if (((uint32_t)buf8 & 0x3) == 0) {
for (i = len; i >= 4; i -= 4) {
*buf32++ = REBASE(OTG_FIFO(0));
usbd_dev->rxbcnt -= 4;
}
} else {
for (i = len; i >= 4; i -= 4) {
word32 = REBASE(OTG_FIFO(0));
memcpy(buf8, &word32, 4);
usbd_dev->rxbcnt -= 4;
buf8 += 4;
}
/* buf32 needs to be updated as it is used for extra */
buf32 = (uint32_t *)buf8;
}
#endif /* defined(__ARM_ARCH_6M__) */
if (i) {
extra = REBASE(OTG_FIFO(0));