hi,everyone:
i have some question when reading kernel 2.6.8 uhci_start.
kernel2.6.8 uhci-hcd.c uhci_start():
========code from uhci_start====================
uhci->skel_int128_qh->link =
uhci->skel_int64_qh->link =
uhci->skel_int32_qh->link =
uhci->skel_int16_qh->link =
uhci->skel_int8_qh->link =
uhci->skel_int4_qh->link =
uhci->skel_int2_qh->link =
cpu_to_le32(uhci->skel_int1_qh->dma_handle) | UHCI_PTR_QH;
uhci->skel_int1_qh->link = cpu_to_le32(uhci->skel_ls_control_qh->dma_handle) |
UHCI_PTR_QH;
uhci->skel_ls_control_qh->link =
cpu_to_le32(uhci->skel_fs_control_qh->dma_handle) | UHCI_PTR_QH;
uhci->skel_fs_control_qh->link = cpu_to_le32(uhci->skel_bulk_qh->dma_handle) |
UHCI_PTR_QH;
uhci->skel_bulk_qh->link = cpu_to_le32(uhci->skel_term_qh->dma_handle) |
UHCI_PTR_QH;
uhci_fill_td(uhci->term_td, 0, (UHCI_NULL_DATA_SIZE << 21) |
(0x7f << TD_TOKEN_DEVADDR_SHIFT) | USB_PID_IN, 0);
uhci->term_td->link = cpu_to_le32(uhci->term_td->dma_handle);
uhci->skel_term_qh->link = UHCI_PTR_TERM;
uhci->skel_term_qh->element = cpu_to_le32(uhci->term_td->dma_handle);
for (i = 0; i < UHCI_NUMFRAMES; i++) {
int irq;
irq = 6 - (int) __ffs(i + UHCI_NUMFRAMES);
if (irq < 0)
irq = 7;
uhci->fl->frame[i] = cpu_to_le32(uhci->skelqh[irq]->dma_handle);
}
=========================================
i get the follow table from the above code.
==================
frame skelqh
0 skel_intr1_qh
1 skel_intr2_qh
2 skel_intr4_qh
3 skel_intr2_qh
4 skel_intr8_qh
5 skel_intr2_qh
6 skel_intr4_qh
7 skel_intr2_qh
.....
===================
my question is :
1.i think skel_intr(N)_qh will be runed every N frame.is it?
but why skel_intr8_qh linked frame 4?
2.why skel_intr64_qh not linked to skel_intr128_qh just like kernel_2.4.*?
so when processing skel_inter128_qh,how to execute
skel_intr64_qh,skel_intr32_qh...
regards
luzt
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