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/*
* Copyright (C) 2014 Nico Huber <nico.h@gmx.de>
*
* Code borrowed from pci_early.c:
* Copyright (C) 2011 Google Inc
*
* 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; version 2 of the License.
*
* 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.
*/
#include <device/pci_ehci.h>
static unsigned pci_find_next_capability(pci_devfn_t dev, unsigned cap, unsigned last)
{
unsigned pos = 0;
u16 status;
unsigned reps = 48;
status = pci_read_config16(dev, PCI_STATUS);
if (!(status & PCI_STATUS_CAP_LIST))
return 0;
u8 hdr_type = pci_read_config8(dev, PCI_HEADER_TYPE);
switch (hdr_type & 0x7f) {
case PCI_HEADER_TYPE_NORMAL:
case PCI_HEADER_TYPE_BRIDGE:
pos = PCI_CAPABILITY_LIST;
break;
case PCI_HEADER_TYPE_CARDBUS:
pos = PCI_CB_CAPABILITY_LIST;
break;
default:
return 0;
}
pos = pci_read_config8(dev, pos);
while (reps-- && (pos >= 0x40)) { /* Loop through the linked list. */
unsigned this_cap;
pos &= ~3;
this_cap = pci_read_config8(dev, pos + PCI_CAP_LIST_ID);
if (this_cap == 0xff)
break;
if (!last && (this_cap == cap))
return pos;
if (last == pos)
last = 0;
pos = pci_read_config8(dev, pos + PCI_CAP_LIST_NEXT);
}
return 0;
}
static unsigned pci_find_capability(pci_devfn_t dev, unsigned cap)
{
return pci_find_next_capability(dev, cap, 0);
}
extern void *ehci_bar;
int ehci_debug_hw_enable(unsigned int *base, unsigned int *dbg_offset)
{
pci_devfn_t dbg_dev = pci_ehci_dbg_dev(CONFIG_USBDEBUG_HCD_INDEX);
pci_ehci_dbg_enable(dbg_dev, CONFIG_EHCI_BAR);
pci_devfn_t dev = dbg_dev;
u8 pos = pci_find_capability(dev, PCI_CAP_ID_EHCI_DEBUG);
if (!pos)
return -1;
u32 cap = pci_read_config32(dev, pos);
/* FIXME: We should remove static EHCI_BAR_INDEX. */
u8 dbg_bar = 0x10 + 4 * ((cap >> 29) - 1);
if (dbg_bar != EHCI_BAR_INDEX)
return -1;
*base = (u32)ehci_bar;
*dbg_offset = (cap>>16) & 0x1ffc;
return 0;
}
void ehci_debug_select_port(unsigned int port)
{
pci_devfn_t dbg_dev = pci_ehci_dbg_dev(CONFIG_USBDEBUG_HCD_INDEX);
pci_ehci_dbg_set_port(dbg_dev, port);
}
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