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Add experimental support for isochronous transfers in the usb ARC driver. There are several details to tweaks however.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25130 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Amaury Pouly 2010-03-12 10:59:34 +00:00
parent 263e4d5cbf
commit c7517f5662
2 changed files with 27 additions and 7 deletions
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4
firmware/export/config.h
View file

@ -882,6 +882,10 @@ Lyre prototype 1 */
//#define USB_HAS_INTERRUPT -- seems to be broken
#endif /* CONFIG_USBOTG */
#if CONFIG_USBOTG == USBOTG_ARC
#define USB_HAS_ISOCHRONOUS
#endif
/* define the class drivers to enable */
#ifdef BOOTLOADER

30
firmware/target/arm/usb-drv-arc.c
View file

@ -368,7 +368,7 @@ static void prepare_td(struct transfer_descriptor* td,
struct transfer_descriptor* previous_td, void *ptr, int len,int pipe);
static void bus_reset(void);
static void init_control_queue_heads(void);
static void init_bulk_queue_heads(void);
static void init_queue_heads(void);
static void init_endpoints(void);
/*-------------------------------------------------------------------------*/
static void usb_drv_stop(void)
@ -645,7 +645,7 @@ bool usb_drv_powered(void)
void usb_drv_set_address(int address)
{
REG_DEVICEADDR = address << USBDEVICEADDRESS_BIT_POS;
init_bulk_queue_heads();
init_queue_heads();
init_endpoints();
}
@ -862,6 +862,7 @@ static void prepare_td(struct transfer_descriptor* td,
void *ptr, int len,int pipe)
{
//logf("adding a td : %d",len);
/* FIXME td allow iso packets per frame override but we don't use it here */
memset(td, 0, sizeof(struct transfer_descriptor));
td->next_td_ptr = DTD_NEXT_TERMINATE;
td->size_ioc_sts = (len<< DTD_LENGTH_BIT_POS) |
@ -979,18 +980,33 @@ static void init_control_queue_heads(void)
qh_array[EP_CONTROL+1].dtd.next_td_ptr = QH_NEXT_TERMINATE;
}
/* manual: 32.14.4.1 Queue Head Initialization */
static void init_bulk_queue_heads(void)
static void init_queue_heads(void)
{
/* FIXME the packetsize for isochronous transfers is 1023 : 1024 but
* the current code only support one type of packet size so we restrict
* isochronous packet size for now also */
int packetsize = (usb_drv_port_speed() ? 512 : 64);
int i;
/* TODO: this should take ep_allocation into account */
for (i=1;i<USB_NUM_ENDPOINTS;i++) {
qh_array[i*2].max_pkt_length = packetsize << QH_MAX_PKT_LEN_POS |
QH_ZLT_SEL;
/* OUT */
if(endpoints[i].type[DIR_OUT] == USB_ENDPOINT_XFER_ISOC)
/* FIXME: we can adjust the number of packets per frame, currently use one */
qh_array[i*2].max_pkt_length = packetsize << QH_MAX_PKT_LEN_POS | QH_ZLT_SEL | 1 << QH_MULT_POS;
else
qh_array[i*2].max_pkt_length = packetsize << QH_MAX_PKT_LEN_POS | QH_ZLT_SEL;
qh_array[i*2].dtd.next_td_ptr = QH_NEXT_TERMINATE;
qh_array[i*2+1].max_pkt_length = packetsize << QH_MAX_PKT_LEN_POS |
QH_ZLT_SEL;
/* IN */
if(endpoints[i].type[DIR_IN] == USB_ENDPOINT_XFER_ISOC)
/* FIXME: we can adjust the number of packets per frame, currently use one */
qh_array[i*2+1].max_pkt_length = packetsize << QH_MAX_PKT_LEN_POS | QH_ZLT_SEL | 1 << QH_MULT_POS;
else
qh_array[i*2+1].max_pkt_length = packetsize << QH_MAX_PKT_LEN_POS | QH_ZLT_SEL;
qh_array[i*2+1].dtd.next_td_ptr = QH_NEXT_TERMINATE;
}
}