/* * URB OHCI HCD (Host Controller Driver) for USB on the S3C2400. * * (C) Copyright 2003 * Gary Jennejohn, DENX Software Engineering * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA * * Note: Part of this code has been derived from linux * */ /* * IMPORTANT NOTES * 1 - you MUST define LITTLEENDIAN in the configuration file for the * board or this driver will NOT work! * 2 - this driver is intended for use with USB Mass Storage Devices * (BBB) ONLY. There is NO support for Interrupt or Isochronous pipes! */ #include /* #include no PCI on the S3C2400 */ #ifdef CONFIG_USB_OHCI #include #include #include #include "usb_ohci.h" #define OHCI_USE_NPS /* force NoPowerSwitching mode */ #undef OHCI_VERBOSE_DEBUG /* not always helpful */ /* For initializing controller (mask in an HCFS mode too) */ #define OHCI_CONTROL_INIT \ (OHCI_CTRL_CBSR & 0x3) | OHCI_CTRL_IE | OHCI_CTRL_PLE #define OHCI_UNLINK_TIMEOUT (CFG_HZ / 10) #define readl(a) (*((vu_long *)(a))) #define writel(a, b) (*((vu_long *)(b)) = ((vu_long)a)) #define min_t(type,x,y) ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; }) #undef DEBUG #ifdef DEBUG #define dbg(format, arg...) printf("DEBUG: " format "\n", ## arg) #else #define dbg(format, arg...) do {} while(0) #endif /* DEBUG */ #define err(format, arg...) printf("ERROR: " format "\n", ## arg) #undef SHOW_INFO #ifdef SHOW_INFO #define info(format, arg...) printf("INFO: " format "\n", ## arg) #else #define info(format, arg...) do {} while(0) #endif #define m16_swap(x) swap_16(x) #define m32_swap(x) swap_32(x) /* global ohci_t */ static ohci_t gohci; /* this must be aligned to a 256 byte boundary */ struct ohci_hcca ghcca[1]; /* a pointer to the aligned storage */ struct ohci_hcca *phcca; /* this allocates EDs for all possible endpoints */ struct ohci_device ohci_dev; /* urb_priv */ urb_priv_t urb_priv; /*-------------------------------------------------------------------------*/ /* AMD-756 (D2 rev) reports corrupt register contents in some cases. * The erratum (#4) description is incorrect. AMD's workaround waits * till some bits (mostly reserved) are clear; ok for all revs. */ #define OHCI_QUIRK_AMD756 0xabcd #define read_roothub(hc, register, mask) ({ \ u32 temp = readl (&hc->regs->roothub.register); \ if (hc->flags & OHCI_QUIRK_AMD756) \ while (temp & mask) \ temp = readl (&hc->regs->roothub.register); \ temp; }) static u32 roothub_a (struct ohci *hc) { return read_roothub (hc, a, 0xfc0fe000); } static inline u32 roothub_b (struct ohci *hc) { return readl (&hc->regs->roothub.b); } static inline u32 roothub_status (struct ohci *hc) { return readl (&hc->regs->roothub.status); } static u32 roothub_portstatus (struct ohci *hc, int i) { return read_roothub (hc, portstatus [i], 0xffe0fce0); } /* forward declaration */ static int hc_interrupt (void); static void td_submit_job (struct usb_device * dev, unsigned long pipe, void * buffer, int transfer_len, struct devrequest * setup, urb_priv_t * urb, int interval); /*-------------------------------------------------------------------------* * URB support functions *-------------------------------------------------------------------------*/ /* free HCD-private data associated with this URB */ static void urb_free_priv (urb_priv_t * urb) { int i; int last; struct td * td; last = urb->length - 1; if (last >= 0) { for (i = 0; i <= last; i++) { td = urb->td[i]; if (td) { td->usb_dev = NULL; urb->td[i] = NULL; } } } } /*-------------------------------------------------------------------------*/ #ifdef DEBUG static int sohci_get_current_frame_number (struct usb_device * dev); /* debug| print the main components of an URB * small: 0) header + data packets 1) just header */ static void pkt_print (struct usb_device * dev, unsigned long pipe, void * buffer, int transfer_len, struct devrequest * setup, char * str, int small) { urb_priv_t * purb = &urb_priv; dbg("%s URB:[%4x] dev:%2d,ep:%2d-%c,type:%s,len:%d/%d stat:%#lx", str, sohci_get_current_frame_number (dev), usb_pipedevice (pipe), usb_pipeendpoint (pipe), usb_pipeout (pipe)? 'O': 'I', usb_pipetype (pipe) < 2? (usb_pipeint (pipe)? "INTR": "ISOC"): (usb_pipecontrol (pipe)? "CTRL": "BULK"), purb->actual_length, transfer_len, dev->status); #ifdef OHCI_VERBOSE_DEBUG if (!small) { int i, len; if (usb_pipecontrol (pipe)) { printf (__FILE__ ": cmd(8):"); for (i = 0; i < 8 ; i++) printf (" %02x", ((__u8 *) setup) [i]); printf ("\n"); } if (transfer_len > 0 && buffer) { printf (__FILE__ ": data(%d/%d):", purb->actual_length, transfer_len); len = usb_pipeout (pipe)? transfer_len: purb->actual_length; for (i = 0; i < 16 && i < len; i++) printf (" %02x", ((__u8 *) buffer) [i]); printf ("%s\n", i < len? "...": ""); } } #endif } /* just for debugging; prints non-empty branches of the int ed tree inclusive iso eds*/ void ep_print_int_eds (ohci_t *ohci, char * str) { int i, j; __u32 * ed_p; for (i= 0; i < 32; i++) { j = 5; ed_p = &(ohci->hcca->int_table [i]); if (*ed_p == 0) continue; printf (__FILE__ ": %s branch int %2d(%2x):", str, i, i); while (*ed_p != 0 && j--) { ed_t *ed = (ed_t *)m32_swap(ed_p); printf (" ed: %4x;", ed->hwINFO); ed_p = &ed->hwNextED; } printf ("\n"); } } static void ohci_dump_intr_mask (char *label, __u32 mask) { dbg ("%s: 0x%08x%s%s%s%s%s%s%s%s%s", label, mask, (mask & OHCI_INTR_MIE) ? " MIE" : "", (mask & OHCI_INTR_OC) ? " OC" : "", (mask & OHCI_INTR_RHSC) ? " RHSC" : "", (mask & OHCI_INTR_FNO) ? " FNO" : "", (mask & OHCI_INTR_UE) ? " UE" : "", (mask & OHCI_INTR_RD) ? " RD" : "", (mask & OHCI_INTR_SF) ? " SF" : "", (mask & OHCI_INTR_WDH) ? " WDH" : "", (mask & OHCI_INTR_SO) ? " SO" : "" ); } static void maybe_print_eds (char *label, __u32 value) { ed_t *edp = (ed_t *)value; if (value) { dbg ("%s %08x", label, value); dbg ("%08x", edp->hwINFO); dbg ("%08x", edp->hwTailP); dbg ("%08x", edp->hwHeadP); dbg ("%08x", edp->hwNextED); } } static char * hcfs2string (int state) { switch (state) { case OHCI_USB_RESET: return "reset"; case OHCI_USB_RESUME: return "resume"; case OHCI_USB_OPER: return "operational"; case OHCI_USB_SUSPEND: return "suspend"; } return "?"; } /* dump control and status registers */ static void ohci_dump_status (ohci_t *controller) { struct ohci_regs *regs = controller->regs; __u32 temp; temp = readl (®s->revision) & 0xff; if (temp != 0x10) dbg ("spec %d.%d", (temp >> 4), (temp & 0x0f)); temp = readl (®s->control); dbg ("control: 0x%08x%s%s%s HCFS=%s%s%s%s%s CBSR=%d", temp, (temp & OHCI_CTRL_RWE) ? " RWE" : "", (temp & OHCI_CTRL_RWC) ? " RWC" : "", (temp & OHCI_CTRL_IR) ? " IR" : "", hcfs2string (temp & OHCI_CTRL_HCFS), (temp & OHCI_CTRL_BLE) ? " BLE" : "", (temp & OHCI_CTRL_CLE) ? " CLE" : "", (temp & OHCI_CTRL_IE) ? " IE" : "", (temp & OHCI_CTRL_PLE) ? " PLE" : "", temp & OHCI_CTRL_CBSR ); temp = readl (®s->cmdstatus); dbg ("cmdstatus: 0x%08x SOC=%d%s%s%s%s", temp, (temp & OHCI_SOC) >> 16, (temp & OHCI_OCR) ? " OCR" : "", (temp & OHCI_BLF) ? " BLF" : "", (temp & OHCI_CLF) ? " CLF" : "", (temp & OHCI_HCR) ? " HCR" : "" ); ohci_dump_intr_mask ("intrstatus", readl (®s->intrstatus)); ohci_dump_intr_mask ("intrenable", readl (®s->intrenable)); maybe_print_eds ("ed_periodcurrent", readl (®s->ed_periodcurrent)); maybe_print_eds ("ed_controlhead", readl (®s->ed_controlhead)); maybe_print_eds ("ed_controlcurrent", readl (®s->ed_controlcurrent)); maybe_print_eds ("ed_bulkhead", readl (®s->ed_bulkhead)); maybe_print_eds ("ed_bulkcurrent", readl (®s->ed_bulkcurrent)); maybe_print_eds ("donehead", readl (®s->donehead)); } static void ohci_dump_roothub (ohci_t *controller, int verbose) { __u32 temp, ndp, i; temp = roothub_a (controller); ndp = (temp & RH_A_NDP); if (verbose) { dbg ("roothub.a: %08x POTPGT=%d%s%s%s%s%s NDP=%d", temp, ((temp & RH_A_POTPGT) >> 24) & 0xff, (temp & RH_A_NOCP) ? " NOCP" : "", (temp & RH_A_OCPM) ? " OCPM" : "", (temp & RH_A_DT) ? " DT" : "", (temp & RH_A_NPS) ? " NPS" : "", (temp & RH_A_PSM) ? " PSM" : "", ndp ); temp = roothub_b (controller); dbg ("roothub.b: %08x PPCM=%04x DR=%04x", temp, (temp & RH_B_PPCM) >> 16, (temp & RH_B_DR) ); temp = roothub_status (controller); dbg ("roothub.status: %08x%s%s%s%s%s%s", temp, (temp & RH_HS_CRWE) ? " CRWE" : "", (temp & RH_HS_OCIC) ? " OCIC" : "", (temp & RH_HS_LPSC) ? " LPSC" : "", (temp & RH_HS_DRWE) ? " DRWE" : "", (temp & RH_HS_OCI) ? " OCI" : "", (temp & RH_HS_LPS) ? " LPS" : "" ); } for (i = 0; i < ndp; i++) { temp = roothub_portstatus (controller, i); dbg ("roothub.portstatus [%d] = 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s", i, temp, (temp & RH_PS_PRSC) ? " PRSC" : "", (temp & RH_PS_OCIC) ? " OCIC" : "", (temp & RH_PS_PSSC) ? " PSSC" : "", (temp & RH_PS_PESC) ? " PESC" : "", (temp & RH_PS_CSC) ? " CSC" : "", (temp & RH_PS_LSDA) ? " LSDA" : "", (temp & RH_PS_PPS) ? " PPS" : "", (temp & RH_PS_PRS) ? " PRS" : "", (temp & RH_PS_POCI) ? " POCI" : "", (temp & RH_PS_PSS) ? " PSS" : "", (temp & RH_PS_PES) ? " PES" : "", (temp & RH_PS_CCS) ? " CCS" : "" ); } } static void ohci_dump (ohci_t *controller, int verbose) { dbg ("OHCI controller usb-%s state", controller->slot_name); /* dumps some of the state we know about */ ohci_dump_status (controller); if (verbose) ep_print_int_eds (controller, "hcca"); dbg ("hcca frame #%04x", controller->hcca->frame_no); ohci_dump_roothub (controller, 1); } #endif /* DEBUG */ /*-------------------------------------------------------------------------* * Interface functions (URB) *-------------------------------------------------------------------------*/ /* get a transfer request */ int sohci_submit_job(struct usb_device *dev, unsigned long pipe, void *buffer, int transfer_len, struct devrequest *setup, int interval) { ohci_t *ohci; ed_t * ed; urb_priv_t *purb_priv; int i, size = 0; ohci = &gohci; /* when controller's hung, permit only roothub cleanup attempts * such as powering down ports */ if (ohci->disabled) { err("sohci_submit_job: EPIPE"); return -1; } /* every endpoint has a ed, locate and fill it */ if (!(ed = ep_add_ed (dev, pipe))) { err("sohci_submit_job: ENOMEM"); return -1; } /* for the private part of the URB we need the number of TDs (size) */ switch (usb_pipetype (pipe)) { case PIPE_BULK: /* one TD for every 4096 Byte */ size = (transfer_len - 1) / 4096 + 1; break; case PIPE_CONTROL: /* 1 TD for setup, 1 for ACK and 1 for every 4096 B */ size = (transfer_len == 0)? 2: (transfer_len - 1) / 4096 + 3; break; } if (size >= (N_URB_TD - 1)) { err("need %d TDs, only have %d", size, N_URB_TD); return -1; } purb_priv = &urb_priv; purb_priv->pipe = pipe; /* fill the private part of the URB */ purb_priv->length = size; purb_priv->ed = ed; purb_priv->actual_length = 0; /* allocate the TDs */ /* note that td[0] was allocated in ep_add_ed */ for (i = 0; i < size; i++) { purb_priv->td[i] = td_alloc (dev); if (!purb_priv->td[i]) { purb_priv->length = i; urb_free_priv (purb_priv); err("sohci_submit_job: ENOMEM"); return -1; } } if (ed->state == ED_NEW || (ed->state & ED_DEL)) { urb_free_priv (purb_priv); err("sohci_submit_job: EINVAL"); return -1; } /* link the ed into a chain if is not already */ if (ed->state != ED_OPER) ep_link (ohci, ed); /* fill the TDs and link it to the ed */ td_submit_job(dev, pipe, buffer, transfer_len, setup, purb_priv, interval); return 0; } /*-------------------------------------------------------------------------*/ #ifdef DEBUG /* tell us the current USB frame number */ static int sohci_get_current_frame_number (struct usb_device *usb_dev) { ohci_t *ohci = &gohci; return m16_swap (ohci->hcca->frame_no); } #endif /*-------------------------------------------------------------------------* * ED handling functions *-------------------------------------------------------------------------*/ /* link an ed into one of the HC chains */ static int ep_link (ohci_t *ohci, ed_t *edi) { volatile ed_t *ed = edi; ed->state = ED_OPER; switch (ed->type) { case PIPE_CONTROL: ed->hwNextED = 0; if (ohci->ed_controltail == NULL) { writel (ed, &ohci->regs->ed_controlhead); } else { ohci->ed_controltail->hwNextED = m32_swap (ed); } ed->ed_prev = ohci->ed_controltail; if (!ohci->ed_controltail && !ohci->ed_rm_list[0] && !ohci->ed_rm_list[1] && !ohci->sleeping) { ohci->hc_control |= OHCI_CTRL_CLE; writel (ohci->hc_control, &ohci->regs->control); } ohci->ed_controltail = edi; break; case PIPE_BULK: ed->hwNextED = 0; if (ohci->ed_bulktail == NULL) { writel (ed, &ohci->regs->ed_bulkhead); } else { ohci->ed_bulktail->hwNextED = m32_swap (ed); } ed->ed_prev = ohci->ed_bulktail; if (!ohci->ed_bulktail && !ohci->ed_rm_list[0] && !ohci->ed_rm_list[1] && !ohci->sleeping) { ohci->hc_control |= OHCI_CTRL_BLE; writel (ohci->hc_control, &ohci->regs->control); } ohci->ed_bulktail = edi; break; } return 0; } /*-------------------------------------------------------------------------*/ /* unlink an ed from one of the HC chains. * just the link to the ed is unlinked. * the link from the ed still points to another operational ed or 0 * so the HC can eventually finish the processing of the unlinked ed */ static int ep_unlink (ohci_t *ohci, ed_t *ed) { ed->hwINFO |= m32_swap (OHCI_ED_SKIP); switch (ed->type) { case PIPE_CONTROL: if (ed->ed_prev == NULL) { if (!ed->hwNextED) { ohci->hc_control &= ~OHCI_CTRL_CLE; writel (ohci->hc_control, &ohci->regs->control); } writel (m32_swap (*((__u32 *)&ed->hwNextED)), &ohci->regs->ed_controlhead); } else { ed->ed_prev->hwNextED = ed->hwNextED; } if (ohci->ed_controltail == ed) { ohci->ed_controltail = ed->ed_prev; } else { ((ed_t *)m32_swap (*((__u32 *)&ed->hwNextED)))->ed_prev = ed->ed_prev; } break; case PIPE_BULK: if (ed->ed_prev == NULL) { if (!ed->hwNextED) { ohci->hc_control &= ~OHCI_CTRL_BLE; writel (ohci->hc_control, &ohci->regs->control); } writel (m32_swap (*((__u32 *)&ed->hwNextED)), &ohci->regs->ed_bulkhead); } else { ed->ed_prev->hwNextED = ed->hwNextED; } if (ohci->ed_bulktail == ed) { ohci->ed_bulktail = ed->ed_prev; } else { ((ed_t *)m32_swap (*((__u32 *)&ed->hwNextED)))->ed_prev = ed->ed_prev; } break; } ed->state = ED_UNLINK; return 0; } /*-------------------------------------------------------------------------*/ /* add/reinit an endpoint; this should be done once at the usb_set_configuration command, * but the USB stack is a little bit stateless so we do it at every transaction * if the state of the ed is ED_NEW then a dummy td is added and the state is changed to ED_UNLINK * in all other cases the state is left unchanged * the ed info fields are setted anyway even though most of them should not change */ static ed_t * ep_add_ed (struct usb_device *usb_dev, unsigned long pipe) { td_t *td; ed_t *ed_ret; volatile ed_t *ed; ed = ed_ret = &ohci_dev.ed[(usb_pipeendpoint (pipe) << 1) | (usb_pipecontrol (pipe)? 0: usb_pipeout (pipe))]; if ((ed->state & ED_DEL) || (ed->state & ED_URB_DEL)) { err("ep_add_ed: pending delete"); /* pending delete request */ return NULL; } if (ed->state == ED_NEW) { ed->hwINFO = m32_swap (OHCI_ED_SKIP); /* skip ed */ /* dummy td; end of td list for ed */ td = td_alloc (usb_dev); ed->hwTailP = m32_swap (td); ed->hwHeadP = ed->hwTailP; ed->state = ED_UNLINK; ed->type = usb_pipetype (pipe); ohci_dev.ed_cnt++; } ed->hwINFO = m32_swap (usb_pipedevice (pipe) | usb_pipeendpoint (pipe) << 7 | (usb_pipeisoc (pipe)? 0x8000: 0) | (usb_pipecontrol (pipe)? 0: (usb_pipeout (pipe)? 0x800: 0x1000)) | usb_pipeslow (pipe) << 13 | usb_maxpacket (usb_dev, pipe) << 16); return ed_ret; } /*-------------------------------------------------------------------------* * TD handling functions *-------------------------------------------------------------------------*/ /* enqueue next TD for this URB (OHCI spec 5.2.8.2) */ static void td_fill (ohci_t *ohci, unsigned int info, void *data, int len, struct usb_device *dev, int index, urb_priv_t *urb_priv) { volatile td_t *td, *td_pt; #ifdef OHCI_FILL_TRACE int i; #endif if (index > urb_priv->length) { err("index > length"); return; } /* use this td as the next dummy */ td_pt = urb_priv->td [index]; td_pt->hwNextTD = 0; /* fill the old dummy TD */ td = urb_priv->td [index] = (td_t *)(m32_swap (urb_priv->ed->hwTailP) & ~0xf); td->ed = urb_priv->ed; td->next_dl_td = NULL; td->index = index; td->data = (__u32)data; #ifdef OHCI_FILL_TRACE if ((usb_pipetype(urb_priv->pipe) == PIPE_BULK) && usb_pipeout(urb_priv->pipe)) { for (i = 0; i < len; i++) printf("td->data[%d] %#2x ",i, ((unsigned char *)td->data)[i]); printf("\n"); } #endif if (!len) data = 0; td->hwINFO = m32_swap (info); td->hwCBP = m32_swap (data); if (data) td->hwBE = m32_swap (data + len - 1); else td->hwBE = 0; td->hwNextTD = m32_swap (td_pt); td->hwPSW [0] = m16_swap (((__u32)data & 0x0FFF) | 0xE000); /* append to queue */ td->ed->hwTailP = td->hwNextTD; } /*-------------------------------------------------------------------------*/ /* prepare all TDs of a transfer */ static void td_submit_job (struct usb_device *dev, unsigned long pipe, void *buffer, int transfer_len, struct devrequest *setup, urb_priv_t *urb, int interval) { ohci_t *ohci = &gohci; int data_len = transfer_len; void *data; int cnt = 0; __u32 info = 0; unsigned int toggle = 0; /* OHCI handles the DATA-toggles itself, we just use the USB-toggle bits for reseting */ if(usb_gettoggle(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe))) { toggle = TD_T_TOGGLE; } else { toggle = TD_T_DATA0; usb_settoggle(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe), 1); } urb->td_cnt = 0; if (data_len) data = buffer; else data = 0; switch (usb_pipetype (pipe)) { case PIPE_BULK: info = usb_pipeout (pipe)? TD_CC | TD_DP_OUT : TD_CC | TD_DP_IN ; while(data_len > 4096) { td_fill (ohci, info | (cnt? TD_T_TOGGLE:toggle), data, 4096, dev, cnt, urb); data += 4096; data_len -= 4096; cnt++; } info = usb_pipeout (pipe)? TD_CC | TD_DP_OUT : TD_CC | TD_R | TD_DP_IN ; td_fill (ohci, info | (cnt? TD_T_TOGGLE:toggle), data, data_len, dev, cnt, urb); cnt++; if (!ohci->sleeping) writel (OHCI_BLF, &ohci->regs->cmdstatus); /* start bulk list */ break; case PIPE_CONTROL: info = TD_CC | TD_DP_SETUP | TD_T_DATA0; td_fill (ohci, info, setup, 8, dev, cnt++, urb); if (data_len > 0) { info = usb_pipeout (pipe)? TD_CC | TD_R | TD_DP_OUT | TD_T_DATA1 : TD_CC | TD_R | TD_DP_IN | TD_T_DATA1; /* NOTE: mishandles transfers >8K, some >4K */ td_fill (ohci, info, data, data_len, dev, cnt++, urb); } info = usb_pipeout (pipe)? TD_CC | TD_DP_IN | TD_T_DATA1: TD_CC | TD_DP_OUT | TD_T_DATA1; td_fill (ohci, info, data, 0, dev, cnt++, urb); if (!ohci->sleeping) writel (OHCI_CLF, &ohci->regs->cmdstatus); /* start Control list */ break; } if (urb->length != cnt) dbg("TD LENGTH %d != CNT %d", urb->length, cnt); } /*-------------------------------------------------------------------------* * Done List handling functions *-------------------------------------------------------------------------*/ /* calculate the transfer length and update the urb */ static void dl_transfer_length(td_t * td) { __u32 tdINFO, tdBE, tdCBP; urb_priv_t *lurb_priv = &urb_priv; tdINFO = m32_swap (td->hwINFO); tdBE = m32_swap (td->hwBE); tdCBP = m32_swap (td->hwCBP); if (!(usb_pipetype (lurb_priv->pipe) == PIPE_CONTROL && ((td->index == 0) || (td->index == lurb_priv->length - 1)))) { if (tdBE != 0) { if (td->hwCBP == 0) lurb_priv->actual_length += tdBE - td->data + 1; else lurb_priv->actual_length += tdCBP - td->data; } } } /*-------------------------------------------------------------------------*/ /* replies to the request have to be on a FIFO basis so * we reverse the reversed done-list */ static td_t * dl_reverse_done_list (ohci_t *ohci) { __u32 td_list_hc; td_t *td_rev = NULL; td_t *td_list = NULL; urb_priv_t *lurb_priv = NULL; td_list_hc = m32_swap (ohci->hcca->done_head) & 0xfffffff0; ohci->hcca->done_head = 0; while (td_list_hc) { td_list = (td_t *)td_list_hc; if (TD_CC_GET (m32_swap (td_list->hwINFO))) { lurb_priv = &urb_priv; dbg(" USB-error/status: %x : %p", TD_CC_GET (m32_swap (td_list->hwINFO)), td_list); if (td_list->ed->hwHeadP & m32_swap (0x1)) { if (lurb_priv && ((td_list->index + 1) < lurb_priv->length)) { td_list->ed->hwHeadP = (lurb_priv->td[lurb_priv->length - 1]->hwNextTD & m32_swap (0xfffffff0)) | (td_list->ed->hwHeadP & m32_swap (0x2)); lurb_priv->td_cnt += lurb_priv->length - td_list->index - 1; } else td_list->ed->hwHeadP &= m32_swap (0xfffffff2); } } td_list->next_dl_td = td_rev; td_rev = td_list; td_list_hc = m32_swap (td_list->hwNextTD) & 0xfffffff0; } return td_list; } /*-------------------------------------------------------------------------*/ /* td done list */ static int dl_done_list (ohci_t *ohci, td_t *td_list) { td_t *td_list_next = NULL; ed_t *ed; int cc = 0; int stat = 0; /* urb_t *urb; */ urb_priv_t *lurb_priv; __u32 tdINFO, edHeadP, edTailP; while (td_list) { td_list_next = td_list->next_dl_td; lurb_priv = &urb_priv; tdINFO = m32_swap (td_list->hwINFO); ed = td_list->ed; dl_transfer_length(td_list); /* error code of transfer */ cc = TD_CC_GET (tdINFO); if (cc != 0) { dbg("ConditionCode %#x", cc); stat = cc_to_error[cc]; } if (ed->state != ED_NEW) { edHeadP = m32_swap (ed->hwHeadP) & 0xfffffff0; edTailP = m32_swap (ed->hwTailP); /* unlink eds if they are not busy */ if ((edHeadP == edTailP) && (ed->state == ED_OPER)) ep_unlink (ohci, ed); } td_list = td_list_next; } return stat; } /*-------------------------------------------------------------------------* * Virtual Root Hub *-------------------------------------------------------------------------*/ /* Device descriptor */ static __u8 root_hub_dev_des[] = { 0x12, /* __u8 bLength; */ 0x01, /* __u8 bDescriptorType; Device */ 0x10, /* __u16 bcdUSB; v1.1 */ 0x01, 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */ 0x00, /* __u8 bDeviceSubClass; */ 0x00, /* __u8 bDeviceProtocol; */ 0x08, /* __u8 bMaxPacketSize0; 8 Bytes */ 0x00, /* __u16 idVendor; */ 0x00, 0x00, /* __u16 idProduct; */ 0x00, 0x00, /* __u16 bcdDevice; */ 0x00, 0x00, /* __u8 iManufacturer; */ 0x01, /* __u8 iProduct; */ 0x00, /* __u8 iSerialNumber; */ 0x01 /* __u8 bNumConfigurations; */ }; /* Configuration descriptor */ static __u8 root_hub_config_des[] = { 0x09, /* __u8 bLength; */ 0x02, /* __u8 bDescriptorType; Configuration */ 0x19, /* __u16 wTotalLength; */ 0x00, 0x01, /* __u8 bNumInterfaces; */ 0x01, /* __u8 bConfigurationValue; */ 0x00, /* __u8 iConfiguration; */ 0x40, /* __u8 bmAttributes; Bit 7: Bus-powered, 6: Self-powered, 5 Remote-wakwup, 4..0: resvd */ 0x00, /* __u8 MaxPower; */ /* interface */ 0x09, /* __u8 if_bLength; */ 0x04, /* __u8 if_bDescriptorType; Interface */ 0x00, /* __u8 if_bInterfaceNumber; */ 0x00, /* __u8 if_bAlternateSetting; */ 0x01, /* __u8 if_bNumEndpoints; */ 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */ 0x00, /* __u8 if_bInterfaceSubClass; */ 0x00, /* __u8 if_bInterfaceProtocol; */ 0x00, /* __u8 if_iInterface; */ /* endpoint */ 0x07, /* __u8 ep_bLength; */ 0x05, /* __u8 ep_bDescriptorType; Endpoint */ 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */ 0x03, /* __u8 ep_bmAttributes; Interrupt */ 0x02, /* __u16 ep_wMaxPacketSize; ((MAX_ROOT_PORTS + 1) / 8 */ 0x00, 0xff /* __u8 ep_bInterval; 255 ms */ }; static unsigned char root_hub_str_index0[] = { 0x04, /* __u8 bLength; */ 0x03, /* __u8 bDescriptorType; String-descriptor */ 0x09, /* __u8 lang ID */ 0x04, /* __u8 lang ID */ }; static unsigned char root_hub_str_index1[] = { 28, /* __u8 bLength; */ 0x03, /* __u8 bDescriptorType; String-descriptor */ 'O', /* __u8 Unicode */ 0, /* __u8 Unicode */ 'H', /* __u8 Unicode */ 0, /* __u8 Unicode */ 'C', /* __u8 Unicode */ 0, /* __u8 Unicode */ 'I', /* __u8 Unicode */ 0, /* __u8 Unicode */ ' ', /* __u8 Unicode */ 0, /* __u8 Unicode */ 'R', /* __u8 Unicode */ 0, /* __u8 Unicode */ 'o', /* __u8 Unicode */ 0, /* __u8 Unicode */ 'o', /* __u8 Unicode */ 0, /* __u8 Unicode */ 't', /* __u8 Unicode */ 0, /* __u8 Unicode */ ' ', /* __u8 Unicode */ 0, /* __u8 Unicode */ 'H', /* __u8 Unicode */ 0, /* __u8 Unicode */ 'u', /* __u8 Unicode */ 0, /* __u8 Unicode */ 'b', /* __u8 Unicode */ 0, /* __u8 Unicode */ }; /* Hub class-specific descriptor is constructed dynamically */ /*-------------------------------------------------------------------------*/ #define OK(x) len = (x); break #ifdef DEBUG #define WR_RH_STAT(x) {info("WR:status %#8x", (x));writel((x), &gohci.regs->roothub.status);} #define WR_RH_PORTSTAT(x) {info("WR:portstatus[%d] %#8x", wIndex-1, (x));writel((x), &gohci.regs->roothub.portstatus[wIndex-1]);} #else #define WR_RH_STAT(x) writel((x), &gohci.regs->roothub.status) #define WR_RH_PORTSTAT(x) writel((x), &gohci.regs->roothub.portstatus[wIndex-1]) #endif #define RD_RH_STAT roothub_status(&gohci) #define RD_RH_PORTSTAT roothub_portstatus(&gohci,wIndex-1) /* request to virtual root hub */ static int ohci_submit_rh_msg(struct usb_device *dev, unsigned long pipe, void *buffer, int transfer_len, struct devrequest *cmd) { void * data = buffer; int leni = transfer_len; int len = 0; int stat = 0; __u32 datab[4]; __u8 *data_buf = (__u8 *)datab; __u16 bmRType_bReq; __u16 wValue; __u16 wIndex; __u16 wLength; #ifdef DEBUG urb_priv.actual_length = 0; pkt_print(dev, pipe, buffer, transfer_len, cmd, "SUB(rh)", usb_pipein(pipe)); #else wait_ms(1); #endif if ((pipe & PIPE_INTERRUPT) == PIPE_INTERRUPT) { info("Root-Hub submit IRQ: NOT implemented"); return 0; } bmRType_bReq = cmd->requesttype | (cmd->request << 8); wValue = m16_swap (cmd->value); wIndex = m16_swap (cmd->index); wLength = m16_swap (cmd->length); info("Root-Hub: adr: %2x cmd(%1x): %08x %04x %04x %04x", dev->devnum, 8, bmRType_bReq, wValue, wIndex, wLength); switch (bmRType_bReq) { /* Request Destination: without flags: Device, RH_INTERFACE: interface, RH_ENDPOINT: endpoint, RH_CLASS means HUB here, RH_OTHER | RH_CLASS almost ever means HUB_PORT here */ case RH_GET_STATUS: *(__u16 *) data_buf = m16_swap (1); OK (2); case RH_GET_STATUS | RH_INTERFACE: *(__u16 *) data_buf = m16_swap (0); OK (2); case RH_GET_STATUS | RH_ENDPOINT: *(__u16 *) data_buf = m16_swap (0); OK (2); case RH_GET_STATUS | RH_CLASS: *(__u32 *) data_buf = m32_swap ( RD_RH_STAT & ~(RH_HS_CRWE | RH_HS_DRWE)); OK (4); case RH_GET_STATUS | RH_OTHER | RH_CLASS: *(__u32 *) data_buf = m32_swap (RD_RH_PORTSTAT); OK (4); case RH_CLEAR_FEATURE | RH_ENDPOINT: switch (wValue) { case (RH_ENDPOINT_STALL): OK (0); } break; case RH_CLEAR_FEATURE | RH_CLASS: switch (wValue) { case RH_C_HUB_LOCAL_POWER: OK(0); case (RH_C_HUB_OVER_CURRENT): WR_RH_STAT(RH_HS_OCIC); OK (0); } break; case RH_CLEAR_FEATURE | RH_OTHER | RH_CLASS: switch (wValue) { case (RH_PORT_ENABLE): WR_RH_PORTSTAT (RH_PS_CCS ); OK (0); case (RH_PORT_SUSPEND): WR_RH_PORTSTAT (RH_PS_POCI); OK (0); case (RH_PORT_POWER): WR_RH_PORTSTAT (RH_PS_LSDA); OK (0); case (RH_C_PORT_CONNECTION): WR_RH_PORTSTAT (RH_PS_CSC ); OK (0); case (RH_C_PORT_ENABLE): WR_RH_PORTSTAT (RH_PS_PESC); OK (0); case (RH_C_PORT_SUSPEND): WR_RH_PORTSTAT (RH_PS_PSSC); OK (0); case (RH_C_PORT_OVER_CURRENT): WR_RH_PORTSTAT (RH_PS_OCIC); OK (0); case (RH_C_PORT_RESET): WR_RH_PORTSTAT (RH_PS_PRSC); OK (0); } break; case RH_SET_FEATURE | RH_OTHER | RH_CLASS: switch (wValue) { case (RH_PORT_SUSPEND): WR_RH_PORTSTAT (RH_PS_PSS ); OK (0); case (RH_PORT_RESET): /* BUG IN HUP CODE *********/ if (RD_RH_PORTSTAT & RH_PS_CCS) WR_RH_PORTSTAT (RH_PS_PRS); OK (0); case (RH_PORT_POWER): WR_RH_PORTSTAT (RH_PS_PPS ); OK (0); case (RH_PORT_ENABLE): /* BUG IN HUP CODE *********/ if (RD_RH_PORTSTAT & RH_PS_CCS) WR_RH_PORTSTAT (RH_PS_PES ); OK (0); } break; case RH_SET_ADDRESS: gohci.rh.devnum = wValue; OK(0); case RH_GET_DESCRIPTOR: switch ((wValue & 0xff00) >> 8) { case (0x01): /* device descriptor */ len = min_t(unsigned int, leni, min_t(unsigned int, sizeof (root_hub_dev_des), wLength)); data_buf = root_hub_dev_des; OK(len); case (0x02): /* configuration descriptor */ len = min_t(unsigned int, leni, min_t(unsigned int, sizeof (root_hub_config_des), wLength)); data_buf = root_hub_config_des; OK(len); case (0x03): /* string descriptors */ if(wValue==0x0300) { len = min_t(unsigned int, leni, min_t(unsigned int, sizeof (root_hub_str_index0), wLength)); data_buf = root_hub_str_index0; OK(len); } if(wValue==0x0301) { len = min_t(unsigned int, leni, min_t(unsigned int, sizeof (root_hub_str_index1), wLength)); data_buf = root_hub_str_index1; OK(len); } default: stat = USB_ST_STALLED; } break; case RH_GET_DESCRIPTOR | RH_CLASS: { __u32 temp = roothub_a (&gohci); data_buf [0] = 9; /* min length; */ data_buf [1] = 0x29; data_buf [2] = temp & RH_A_NDP; data_buf [3] = 0; if (temp & RH_A_PSM) /* per-port power switching? */ data_buf [3] |= 0x1; if (temp & RH_A_NOCP) /* no overcurrent reporting? */ data_buf [3] |= 0x10; else if (temp & RH_A_OCPM) /* per-port overcurrent reporting? */ data_buf [3] |= 0x8; /* corresponds to data_buf[4-7] */ datab [1] = 0; data_buf [5] = (temp & RH_A_POTPGT) >> 24; temp = roothub_b (&gohci); data_buf [7] = temp & RH_B_DR; if (data_buf [2] < 7) { data_buf [8] = 0xff; } else { data_buf [0] += 2; data_buf [8] = (temp & RH_B_DR) >> 8; data_buf [10] = data_buf [9] = 0xff; } len = min_t(unsigned int, leni, min_t(unsigned int, data_buf [0], wLength)); OK (len); } case RH_GET_CONFIGURATION: *(__u8 *) data_buf = 0x01; OK (1); case RH_SET_CONFIGURATION: WR_RH_STAT (0x10000); OK (0); default: dbg ("unsupported root hub command"); stat = USB_ST_STALLED; } #ifdef DEBUG ohci_dump_roothub (&gohci, 1); #else wait_ms(1); #endif len = min_t(int, len, leni); if (data != data_buf) memcpy (data, data_buf, len); dev->act_len = len; dev->status = stat; #ifdef DEBUG if (transfer_len) urb_priv.actual_length = transfer_len; pkt_print(dev, pipe, buffer, transfer_len, cmd, "RET(rh)", 0/*usb_pipein(pipe)*/); #else wait_ms(1); #endif return stat; } /*-------------------------------------------------------------------------*/ /* common code for handling submit messages - used for all but root hub */ /* accesses. */ int submit_common_msg(struct usb_device *dev, unsigned long pipe, void *buffer, int transfer_len, struct devrequest *setup, int interval) { int stat = 0; int maxsize = usb_maxpacket(dev, pipe); int timeout; #ifdef DEBUG urb_priv.actual_length = 0; pkt_print(dev, pipe, buffer, transfer_len, setup, "SUB", usb_pipein(pipe)); #else wait_ms(1); #endif if (!maxsize) { err("submit_common_message: pipesize for pipe %lx is zero", pipe); return -1; } if (sohci_submit_job(dev, pipe, buffer, transfer_len, setup, interval) < 0) { err("sohci_submit_job failed"); return -1; } wait_ms(10); /* ohci_dump_status(&gohci); */ /* allow more time for a BULK device to react - some are slow */ #define BULK_TO 2000 /* timeout in milliseconds */ if (usb_pipetype (pipe) == PIPE_BULK) timeout = BULK_TO; else timeout = 100; /* wait for it to complete */ for (;;) { /* check whether the controller is done */ stat = hc_interrupt(); if (stat < 0) { stat = 1; break; } if (stat >= 0 && stat != 0xff) { /* 0xff is returned for an SF-interrupt */ break; } if (--timeout) { wait_ms(1); } else { err("CTL:TIMEOUT"); stat = 1; break; } } dev->status = stat; dev->act_len = transfer_len; #ifdef DEBUG pkt_print(dev, pipe, buffer, transfer_len, setup, "RET(ctlr)", usb_pipein(pipe)); #else wait_ms(1); #endif /* free TDs in urb_priv */ urb_free_priv (&urb_priv); return 0; } /* submit routines called from usb.c */ int submit_bulk_msg(struct usb_device *dev, unsigned long pipe, void *buffer, int transfer_len) { info("submit_bulk_msg"); return submit_common_msg(dev, pipe, buffer, transfer_len, NULL, 0); } int submit_control_msg(struct usb_device *dev, unsigned long pipe, void *buffer, int transfer_len, struct devrequest *setup) { int maxsize = usb_maxpacket(dev, pipe); info("submit_control_msg"); #ifdef DEBUG urb_priv.actual_length = 0; pkt_print(dev, pipe, buffer, transfer_len, setup, "SUB", usb_pipein(pipe)); #else wait_ms(1); #endif if (!maxsize) { err("submit_control_message: pipesize for pipe %lx is zero", pipe); return -1; } if (((pipe >> 8) & 0x7f) == gohci.rh.devnum) /* root hub - redirect */ return ohci_submit_rh_msg(dev, pipe, buffer, transfer_len, setup); return submit_common_msg(dev, pipe, buffer, transfer_len, setup, 0); } int submit_int_msg(struct usb_device *dev, unsigned long pipe, void *buffer, int transfer_len, int interval) { info("submit_int_msg"); return -1; } /*-------------------------------------------------------------------------* * HC functions *-------------------------------------------------------------------------*/ /* reset the HC and BUS */ static int hc_reset (ohci_t *ohci) { int timeout = 30; int smm_timeout = 50; /* 0,5 sec */ if (readl (&ohci->regs->control) & OHCI_CTRL_IR) { /* SMM owns the HC */ writel (OHCI_OCR, &ohci->regs->cmdstatus); /* request ownership */ info("USB HC TakeOver from SMM"); while (readl (&ohci->regs->control) & OHCI_CTRL_IR) { wait_ms (10); if (--smm_timeout == 0) { err("USB HC TakeOver failed!"); return -1; } } } /* Disable HC interrupts */ writel (OHCI_INTR_MIE, &ohci->regs->intrdisable); dbg("USB HC reset_hc usb-%s: ctrl = 0x%X ;", ohci->slot_name, readl (&ohci->regs->control)); /* Reset USB (needed by some controllers) */ writel (0, &ohci->regs->control); /* HC Reset requires max 10 us delay */ writel (OHCI_HCR, &ohci->regs->cmdstatus); while ((readl (&ohci->regs->cmdstatus) & OHCI_HCR) != 0) { if (--timeout == 0) { err("USB HC reset timed out!"); return -1; } udelay (1); } return 0; } /*-------------------------------------------------------------------------*/ /* Start an OHCI controller, set the BUS operational * enable interrupts * connect the virtual root hub */ static int hc_start (ohci_t * ohci) { __u32 mask; unsigned int fminterval; ohci->disabled = 1; /* Tell the controller where the control and bulk lists are * The lists are empty now. */ writel (0, &ohci->regs->ed_controlhead); writel (0, &ohci->regs->ed_bulkhead); writel ((__u32)ohci->hcca, &ohci->regs->hcca); /* a reset clears this */ fminterval = 0x2edf; writel ((fminterval * 9) / 10, &ohci->regs->periodicstart); fminterval |= ((((fminterval - 210) * 6) / 7) << 16); writel (fminterval, &ohci->regs->fminterval); writel (0x628, &ohci->regs->lsthresh); /* start controller operations */ ohci->hc_control = OHCI_CONTROL_INIT | OHCI_USB_OPER; ohci->disabled = 0; writel (ohci->hc_control, &ohci->regs->control); /* Choose the interrupts we care about now, others later on demand */ mask = OHCI_INTR_MIE | OHCI_INTR_UE | OHCI_INTR_WDH | OHCI_INTR_SO; writel (mask, &ohci->regs->intrstatus); #ifdef OHCI_USE_NPS /* required for AMD-756 and some Mac platforms */ writel ((roothub_a (ohci) | RH_A_NPS) & ~RH_A_PSM, &ohci->regs->roothub.a); writel (RH_HS_LPSC, &ohci->regs->roothub.status); #endif /* OHCI_USE_NPS */ #define mdelay(n) ({unsigned long msec=(n); while (msec--) udelay(1000);}) /* POTPGT delay is bits 24-31, in 2 ms units. */ mdelay ((roothub_a (ohci) >> 23) & 0x1fe); /* connect the virtual root hub */ ohci->rh.devnum = 0; return 0; } /*-------------------------------------------------------------------------*/ /* an interrupt happens */ static int hc_interrupt (void) { ohci_t *ohci = &gohci; struct ohci_regs *regs = ohci->regs; int ints; int stat = -1; if ((ohci->hcca->done_head != 0) && !(m32_swap (ohci->hcca->done_head) & 0x01)) { ints = OHCI_INTR_WDH; } else { ints = readl (®s->intrstatus); } /* dbg("Interrupt: %x frame: %x", ints, le16_to_cpu (ohci->hcca->frame_no)); */ if (ints & OHCI_INTR_UE) { ohci->disabled++; err ("OHCI Unrecoverable Error, controller usb-%s disabled", ohci->slot_name); /* e.g. due to PCI Master/Target Abort */ #ifdef DEBUG ohci_dump (ohci, 1); #else wait_ms(1); #endif /* FIXME: be optimistic, hope that bug won't repeat often. */ /* Make some non-interrupt context restart the controller. */ /* Count and limit the retries though; either hardware or */ /* software errors can go forever... */ hc_reset (ohci); return -1; } if (ints & OHCI_INTR_WDH) { wait_ms(1); writel (OHCI_INTR_WDH, ®s->intrdisable); stat = dl_done_list (&gohci, dl_reverse_done_list (&gohci)); writel (OHCI_INTR_WDH, ®s->intrenable); } if (ints & OHCI_INTR_SO) { dbg("USB Schedule overrun\n"); writel (OHCI_INTR_SO, ®s->intrenable); stat = -1; } /* FIXME: this assumes SOF (1/ms) interrupts don't get lost... */ if (ints & OHCI_INTR_SF) { unsigned int frame = m16_swap (ohci->hcca->frame_no) & 1; wait_ms(1); writel (OHCI_INTR_SF, ®s->intrdisable); if (ohci->ed_rm_list[frame] != NULL) writel (OHCI_INTR_SF, ®s->intrenable); stat = 0xff; } writel (ints, ®s->intrstatus); return stat; } /*-------------------------------------------------------------------------*/ /*-------------------------------------------------------------------------*/ /* De-allocate all resources.. */ static void hc_release_ohci (ohci_t *ohci) { dbg ("USB HC release ohci usb-%s", ohci->slot_name); if (!ohci->disabled) hc_reset (ohci); } /*-------------------------------------------------------------------------*/ /* * low level initalisation routine, called from usb.c */ static char ohci_inited = 0; int usb_lowlevel_init(void) { S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER(); S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO(); /* * Set the 48 MHz UPLL clocking. Values are taken from * "PLL value selection guide", 6-23, s3c2400_UM.pdf. */ clk_power->UPLLCON = ((40 << 12) + (1 << 4) + 2); gpio->MISCCR |= 0x8; /* 1 = use pads related USB for USB host */ /* * Enable USB host clock. */ clk_power->CLKCON |= (1 << 4); memset (&gohci, 0, sizeof (ohci_t)); memset (&urb_priv, 0, sizeof (urb_priv_t)); /* align the storage */ if ((__u32)&ghcca[0] & 0xff) { err("HCCA not aligned!!"); return -1; } phcca = &ghcca[0]; info("aligned ghcca %p", phcca); memset(&ohci_dev, 0, sizeof(struct ohci_device)); if ((__u32)&ohci_dev.ed[0] & 0x7) { err("EDs not aligned!!"); return -1; } memset(gtd, 0, sizeof(td_t) * (NUM_TD + 1)); if ((__u32)gtd & 0x7) { err("TDs not aligned!!"); return -1; } ptd = gtd; gohci.hcca = phcca; memset (phcca, 0, sizeof (struct ohci_hcca)); gohci.disabled = 1; gohci.sleeping = 0; gohci.irq = -1; gohci.regs = (struct ohci_regs *)S3C24X0_USB_HOST_BASE; gohci.flags = 0; gohci.slot_name = "s3c2400"; if (hc_reset (&gohci) < 0) { hc_release_ohci (&gohci); /* Initialization failed */ clk_power->CLKCON &= ~(1 << 4); return -1; } /* FIXME this is a second HC reset; why?? */ writel (gohci.hc_control = OHCI_USB_RESET, &gohci.regs->control); wait_ms (10); if (hc_start (&gohci) < 0) { err ("can't start usb-%s", gohci.slot_name); hc_release_ohci (&gohci); /* Initialization failed */ clk_power->CLKCON &= ~(1 << 4); return -1; } #ifdef DEBUG ohci_dump (&gohci, 1); #else wait_ms(1); #endif ohci_inited = 1; return 0; } int usb_lowlevel_stop(void) { S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER(); /* this gets called really early - before the controller has */ /* even been initialized! */ if (!ohci_inited) return 0; /* TODO release any interrupts, etc. */ /* call hc_release_ohci() here ? */ hc_reset (&gohci); /* may not want to do this */ clk_power->CLKCON &= ~(1 << 4); return 0; } #endif /* CONFIG_USB_OHCI */