ref: 8a1c1c951066705b98b417f26eebcb293e3b549d
dir: /sys/src/9/teg2/pciteg.c/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/pci.h"
typedef struct {
ulong cap;
ulong ctl;
} Capctl;
typedef struct {
Capctl dev;
Capctl link;
Capctl slot;
} Devlinkslot;
/* capability list id 0x10 is pci-e */
typedef struct Pci Pci;
struct Pci {
/* pci-compatible config */
/* what io.h calls type 0 & type 1 pre-defined header */
ulong id;
ulong cs;
ulong revclass;
ulong misc; /* cache line size, latency timer, header type, bist */
ulong bar[2]; /* always 0 on tegra 2 */
/* types 1 & 2 pre-defined header */
ulong bus;
ulong ioaddrs;
ulong memaddrs;
ulong prefmem;
ulong prefbasehi;
ulong preflimhi;
/* type 2 pre-defined header only */
ulong ioaddrhi;
ulong cfgcapoff; /* offset in cfg. space to cap. list (0x40) */
ulong rom;
ulong intr; /* PciINT[LP] */
/* subsystem capability regs */
ulong subsysid;
ulong subsyscap;
/* */
Capctl pwrmgmt;
/* msi */
ulong msictlcap;
ulong msimsgaddr[2]; /* little-endian */
ulong msimsgdata;
/* pci-e cap. */
uchar _pad0[0x80-0x60];
ulong pciecap;
Devlinkslot port0;
ulong rootctl;
ulong rootsts;
Devlinkslot port1;
/* 0xbc */
};
enum {
/* offsets from soc.pci */
Port0 = 0,
Port1 = 0x1000,
Pads = 0x3000,
Afi = 0x3800,
Aficfg = Afi + 0xac,
Cfgspace = 0x4000,
Ecfgspace = 0x104000,
/* cs bits */
Iospace = 1<<0,
Memspace = 1<<1,
Busmaster = 1<<2,
/* Aficfg bits */
Fpcion = 1<<0,
};
struct Pcictlr {
union {
uchar _padpci[0x1000];
Pci;
} ports[2];
uchar _padpads[0x1000];
uchar pads[0x800];
uchar afi[0x800];
ulong cfg[0x1000];
ulong extcfg[0x1000];
};
static int pcicfgmode = -1;
static int pcimaxbno = 1; /* was 7; only 2 pci buses; touching 3rd hangs */
static Pcidev* pciroot;
extern void rtl8169interrupt(Ureg*, void* arg);
/* not used yet */
static void
pciintr(Ureg *ureg, void *p)
{
rtl8169interrupt(ureg, p); /* HACK */
}
static void
pcicfginit(void)
{
char *p;
Pci *pci = (Pci *)soc.pci;
Pcidev **list;
int bno, n;
/*
* TrimSlice # pci 0 1
* Scanning PCI devices on bus 0 1
* BusDevFun VendorId DeviceId Device Class Sub-Class
* _____________________________________________________________
* 00.00.00 0x10de 0x0bf0 Bridge device 0x04
* 01.00.00 0x10ec 0x8168 Network controller 0x00
*
* thus pci bus 0 has a bridge with, perhaps, an ide/sata ctlr behind,
* and pci bus 1 has the realtek 8169 on it:
*
* TrimSlice # pci 1 long
* Scanning PCI devices on bus 1
*
* Found PCI device 01.00.00:
* vendor ID = 0x10ec
* device ID = 0x8168
* command register = 0x0007
* status register = 0x0010
* revision ID = 0x03
* class code = 0x02 (Network controller)
* sub class code = 0x00
* programming interface = 0x00
* cache line = 0x08
* base address 0 = 0x80400001 config
* base address 1 = 0x00000000 (ext. config)
* base address 2 = 0xa000000c "downstream"
* base address 3 = 0x00000000 (prefetchable)
* base address 4 = 0xa000400c not "
* base address 5 = 0x00000000 (unused)
*/
n = pci->id >> 16;
if (((pci->id & MASK(16)) != Vnvidia || (n != 0xbf0 && n != 0xbf1)) &&
(pci->id & MASK(16)) != Vrealtek) {
print("no pci controller at %#p\n", pci);
return;
}
if (0)
iprint("pci: %#p: nvidia, rev %#ux class %#6.6lux misc %#8.8lux\n",
pci, (uchar)pci->revclass, pci->revclass >> 8,
pci->misc);
pci->cs &= Iospace;
pci->cs |= Memspace | Busmaster;
coherence();
pcicfgmode = 1;
pcimaxdno = 15; /* for trimslice */
fmtinstall('T', tbdffmt);
if(p = getconf("*pcimaxbno")){
n = strtoul(p, 0, 0);
if(n < pcimaxbno)
pcimaxbno = n;
}
if(p = getconf("*pcimaxdno")){
n = strtoul(p, 0, 0);
if(n < pcimaxdno)
pcimaxdno = n;
}
list = &pciroot;
/* was bno = 0; trimslice needs to start at 1 */
for(bno = 1; bno <= pcimaxbno; bno++) {
bno = pciscan(bno, list, nil);
while(*list)
list = &(*list)->link;
}
if(getconf("*pcihinv"))
pcihinv(pciroot);
}
enum {
Afiintrcode = 0xb8,
};
void
pcieintrdone(void) /* dismiss pci-e intr */
{
ulong *afi;
afi = (ulong *)(soc.pci + Afi);
afi[Afiintrcode/sizeof *afi] = 0; /* magic */
coherence();
}
/*
* whole config space for tbdf should be at (return address - rno).
*/
static void *
tegracfgaddr(int tbdf, int rno)
{
uintptr addr;
addr = soc.pci + (rno < 256? Cfgspace: Ecfgspace) + BUSBDF(tbdf) + rno;
// if (BUSBNO(tbdf) == 1)
// addr += Port1;
return (void *)addr;
}
int
pcicfgrw8(int tbdf, int rno, int data, int read)
{
void *addr;
addr = tegracfgaddr(tbdf, rno);
if(read)
data = *(uchar *)addr;
else
*(uchar *)addr = data;
return data;
}
int
pcicfgrw16(int tbdf, int rno, int data, int read)
{
void *addr;
addr = tegracfgaddr(tbdf, rno);
if(read)
data = *(ushort *)addr;
else
*(ushort *)addr = data;
return data;
}
int
pcicfgrw32(int tbdf, int rno, int data, int read)
{
vlong v;
void *addr;
addr = tegracfgaddr(tbdf, rno);
v = probeaddr((uintptr)addr);
if (v < 0)
return -1;
if(read)
data = *(ulong *)addr;
else
*(ulong *)addr = data;
return data;
}
void
pciteglink(void)
{
pcicfginit();
}