| Nico Huber | b0f8326 | 2014-01-01 20:47:55 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 Nico Huber <nico.h@gmx.de> |
| 3 | * |
| 4 | * Code borrowed from pci_early.c: |
| 5 | * Copyright (C) 2011 Google Inc |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; version 2 of the License. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| Nico Huber | b0f8326 | 2014-01-01 20:47:55 +0100 | [diff] [blame] | 15 | */ |
| 16 | |
| 17 | #include <device/pci_ehci.h> |
| 18 | |
| 19 | static unsigned pci_find_next_capability(pci_devfn_t dev, unsigned cap, unsigned last) |
| 20 | { |
| 21 | unsigned pos = 0; |
| 22 | u16 status; |
| 23 | unsigned reps = 48; |
| 24 | |
| 25 | status = pci_read_config16(dev, PCI_STATUS); |
| 26 | if (!(status & PCI_STATUS_CAP_LIST)) |
| 27 | return 0; |
| 28 | |
| 29 | u8 hdr_type = pci_read_config8(dev, PCI_HEADER_TYPE); |
| 30 | switch (hdr_type & 0x7f) { |
| 31 | case PCI_HEADER_TYPE_NORMAL: |
| 32 | case PCI_HEADER_TYPE_BRIDGE: |
| 33 | pos = PCI_CAPABILITY_LIST; |
| 34 | break; |
| 35 | case PCI_HEADER_TYPE_CARDBUS: |
| 36 | pos = PCI_CB_CAPABILITY_LIST; |
| 37 | break; |
| 38 | default: |
| 39 | return 0; |
| 40 | } |
| 41 | |
| 42 | pos = pci_read_config8(dev, pos); |
| 43 | while (reps-- && (pos >= 0x40)) { /* Loop through the linked list. */ |
| 44 | unsigned this_cap; |
| 45 | |
| 46 | pos &= ~3; |
| 47 | this_cap = pci_read_config8(dev, pos + PCI_CAP_LIST_ID); |
| 48 | if (this_cap == 0xff) |
| 49 | break; |
| 50 | |
| 51 | if (!last && (this_cap == cap)) |
| 52 | return pos; |
| 53 | |
| 54 | if (last == pos) |
| 55 | last = 0; |
| 56 | |
| 57 | pos = pci_read_config8(dev, pos + PCI_CAP_LIST_NEXT); |
| 58 | } |
| 59 | return 0; |
| 60 | } |
| 61 | |
| 62 | static unsigned pci_find_capability(pci_devfn_t dev, unsigned cap) |
| 63 | { |
| 64 | return pci_find_next_capability(dev, cap, 0); |
| 65 | } |
| 66 | |
| 67 | extern void *ehci_bar; |
| 68 | int ehci_debug_hw_enable(unsigned int *base, unsigned int *dbg_offset) |
| 69 | { |
| 70 | pci_devfn_t dbg_dev = pci_ehci_dbg_dev(CONFIG_USBDEBUG_HCD_INDEX); |
| 71 | pci_ehci_dbg_enable(dbg_dev, CONFIG_EHCI_BAR); |
| 72 | pci_devfn_t dev = dbg_dev; |
| 73 | |
| 74 | u8 pos = pci_find_capability(dev, PCI_CAP_ID_EHCI_DEBUG); |
| 75 | if (!pos) |
| 76 | return -1; |
| 77 | |
| 78 | u32 cap = pci_read_config32(dev, pos); |
| 79 | |
| 80 | /* FIXME: We should remove static EHCI_BAR_INDEX. */ |
| 81 | u8 dbg_bar = 0x10 + 4 * ((cap >> 29) - 1); |
| 82 | if (dbg_bar != EHCI_BAR_INDEX) |
| 83 | return -1; |
| 84 | |
| 85 | *base = (u32)ehci_bar; |
| 86 | *dbg_offset = (cap>>16) & 0x1ffc; |
| 87 | return 0; |
| 88 | } |
| 89 | |
| 90 | void ehci_debug_select_port(unsigned int port) |
| 91 | { |
| 92 | pci_devfn_t dbg_dev = pci_ehci_dbg_dev(CONFIG_USBDEBUG_HCD_INDEX); |
| 93 | pci_ehci_dbg_set_port(dbg_dev, port); |
| 94 | } |