1/*  *********************************************************************
2    *  Broadcom Common Firmware Environment (CFE)
3    *
4    *  Board device initialization		File: swarm_pci.c
5    *
6    *  This is the part of the board support package for boards
7    *  that support PCI. It describes the board-specific slots/devices
8    *  and wiring thereof.
9    *
10    *********************************************************************
11    *
12    *  Copyright 2000,2001,2002,2003
13    *  Broadcom Corporation. All rights reserved.
14    *
15    *  This software is furnished under license and may be used and
16    *  copied only in accordance with the following terms and
17    *  conditions.  Subject to these conditions, you may download,
18    *  copy, install, use, modify and distribute modified or unmodified
19    *  copies of this software in source and/or binary form.  No title
20    *  or ownership is transferred hereby.
21    *
22    *  1) Any source code used, modified or distributed must reproduce
23    *     and retain this copyright notice and list of conditions
24    *     as they appear in the source file.
25    *
26    *  2) No right is granted to use any trade name, trademark, or
27    *     logo of Broadcom Corporation.  The "Broadcom Corporation"
28    *     name may not be used to endorse or promote products derived
29    *     from this software without the prior written permission of
30    *     Broadcom Corporation.
31    *
32    *  3) THIS SOFTWARE IS PROVIDED "AS-IS" AND ANY EXPRESS OR
33    *     IMPLIED WARRANTIES, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED
34    *     WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
35    *     PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT
36    *     SHALL BROADCOM BE LIABLE FOR ANY DAMAGES WHATSOEVER, AND IN
37    *     PARTICULAR, BROADCOM SHALL NOT BE LIABLE FOR DIRECT, INDIRECT,
38    *     INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
39    *     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
40    *     GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
41    *     BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
42    *     OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
43    *     TORT (INCLUDING NEGLIGENCE OR OTHERWISE), EVEN IF ADVISED OF
44    *     THE POSSIBILITY OF SUCH DAMAGE.
45    ********************************************************************* */
46
47#include "lib_types.h"
48
49#include "pcireg.h"
50#include "pcivar.h"
51#include "pci_internal.h"
52
53/* PCI interrupt mapping on the BCM912500 (SWARM) board:
54   Only device ids 5 and 6 are implemented as PCI connectors, and
55   the only on-board device has id 7 (USB bridge).
56
57   Slot    IDSEL   DevID  INT{A,B,C,D}   shift
58  (PHB)      -       0       {A,-,-,-}     0
59  (LHB)      -       1       {-,-,-,-}     0
60    0       16       5       {A,B,C,D}     0 (identity)
61    1       17       6       {B,C,D,A}     1 (A->B, B->C, C->D, D->A)
62  (USB)     18       7       {C,D,-,-}     2 (A->C, B->D, C->A, D->B)
63    -                                      3 (A->D, B->A, C->B, D->C)
64
65   Device 1 is the LDT host bridge.  By giving it a shift of 0,
66   the normal rotation algorithm gives the correct result for devices
67   on the secondary bus of the LDT host bridge (bus 1).  Firmware
68   must program the API 10ll LDT-PCI bridge so that the normal
69   rotation algorithm gives correct results for its secondary (bus 2):
70
71    0       16       0       {A,B,C,D}     0 (identity)
72    1       17       1       {B,C,D,A}     1 (A->B, B->C, C->D, D->A)
73*/
74
75extern int _pciverbose;
76
77/* Return the base shift of a slot or device on the motherboard.
78   This is board specific, for the SWARM (BCM912500E) only. */
79uint8_t
80pci_int_shift_0(pcitag_t tag)
81{
82    int bus, device;
83
84    pci_break_tag(tag, NULL, &bus, &device, NULL);
85
86    if (bus != 0)
87	return 0;
88    switch (device) {
89    case 0:
90	return 0;
91    case 5: case 6: case 7:
92        return ((device - 5) % 4);
93    default:
94	return 0;
95    }
96}
97
98/* Return the mapping of a SWARM device/function interrupt to an
99   interrupt line.  For the SB-1250, return 1-4 to indicate the
100   pci_inta - pci_intd inputs to the interrupt mapper, respectively,
101   or 0 if there is no mapping.  This is board specific, and the
102   version below is for SWARM (BCM912500E), 32-bit slots only. */
103uint8_t
104pci_int_map_0(pcitag_t tag)
105{
106    pcireg_t data;
107    int pin, bus, device;
108
109    data = pci_conf_read(tag, PCI_BPARAM_INTERRUPT_REG);
110    pin = PCI_INTERRUPT_PIN(data);
111    if (pin == 0) {
112	/* No IRQ used. */
113	return 0;
114    }
115    if (pin > 4) {
116	if (_pciverbose >= 1)
117	    pci_tagprintf(tag, "pci_map_int: bad interrupt pin %d\n", pin);
118	return 0;
119    }
120
121    pci_break_tag(tag, NULL, &bus, &device, NULL);
122
123    if (bus != 0)
124	return 0;
125
126    switch (device) {
127    case 0:
128    case 5: case 6: case 7:
129        return (((pin - 1) + pci_int_shift_0(tag)) % 4) + 1;
130    default:
131        return 0;
132    }
133}
134