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u-boot/drivers/pci/pci_auto.c
Pali Rohár 44efad2ff1 pci: auto: Remove PCI_CLASS_PROCESSOR_POWERPC autoconfig case 
PCI autoconfig case for PCI_CLASS_PROCESSOR_POWERPC just prints debug
message and then calls autoconfig setup code like for any other standard
endpoint device. We do not need special debug message for it, so remove
this case and handle PCI_CLASS_PROCESSOR_POWERPC via default code path.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Heiko Schocher <hs@denx.de>
2023-05-02 08:55:15 -04:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* PCI autoconfiguration library
*
* Author: Matt Porter <mporter@mvista.com>
*
* Copyright 2000 MontaVista Software Inc.
* Copyright (c) 2021 Maciej W. Rozycki <macro@orcam.me.uk>
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <log.h>
#include <pci.h>
#include <time.h>
#include "pci_internal.h"
/* the user can define CFG_SYS_PCI_CACHE_LINE_SIZE to avoid problems */
#ifndef CFG_SYS_PCI_CACHE_LINE_SIZE
#define CFG_SYS_PCI_CACHE_LINE_SIZE 8
#endif
static void dm_pciauto_setup_device(struct udevice *dev,
struct pci_region *mem,
struct pci_region *prefetch,
struct pci_region *io)
{
u32 bar_response;
pci_size_t bar_size;
u16 cmdstat = 0;
int bar, bar_nr = 0;
int bars_num;
u8 header_type;
int rom_addr;
pci_addr_t bar_value;
struct pci_region *bar_res = NULL;
int found_mem64 = 0;
u16 class;
dm_pci_read_config16(dev, PCI_COMMAND, &cmdstat);
cmdstat = (cmdstat & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) |
PCI_COMMAND_MASTER;
dm_pci_read_config8(dev, PCI_HEADER_TYPE, &header_type);
header_type &= 0x7f;
switch (header_type) {
case PCI_HEADER_TYPE_NORMAL:
bars_num = 6;
break;
case PCI_HEADER_TYPE_BRIDGE:
bars_num = 2;
break;
case PCI_HEADER_TYPE_CARDBUS:
/* CardBus header does not have any BAR */
bars_num = 0;
break;
default:
/* Skip configuring BARs for unknown header types */
bars_num = 0;
break;
}
for (bar = PCI_BASE_ADDRESS_0;
bar < PCI_BASE_ADDRESS_0 + (bars_num * 4); bar += 4) {
int ret = 0;
/* Tickle the BAR and get the response */
dm_pci_write_config32(dev, bar, 0xffffffff);
dm_pci_read_config32(dev, bar, &bar_response);
/* If BAR is not implemented (or invalid) go to the next BAR */
if (!bar_response || bar_response == 0xffffffff)
continue;
found_mem64 = 0;
/* Check the BAR type and set our address mask */
if (bar_response & PCI_BASE_ADDRESS_SPACE) {
bar_size = bar_response & PCI_BASE_ADDRESS_IO_MASK;
bar_size &= ~(bar_size - 1);
bar_res = io;
debug("PCI Autoconfig: BAR %d, I/O, size=0x%llx, ",
bar_nr, (unsigned long long)bar_size);
} else {
if ((bar_response & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
PCI_BASE_ADDRESS_MEM_TYPE_64) {
u32 bar_response_upper;
u64 bar64;
dm_pci_write_config32(dev, bar + 4, 0xffffffff);
dm_pci_read_config32(dev, bar + 4,
&bar_response_upper);
bar64 = ((u64)bar_response_upper << 32) |
bar_response;
bar_size = ~(bar64 & PCI_BASE_ADDRESS_MEM_MASK)
+ 1;
found_mem64 = 1;
} else {
bar_size = (u32)(~(bar_response &
PCI_BASE_ADDRESS_MEM_MASK) + 1);
}
if (prefetch &&
(bar_response & PCI_BASE_ADDRESS_MEM_PREFETCH))
bar_res = prefetch;
else
bar_res = mem;
debug("PCI Autoconfig: BAR %d, %s%s, size=0x%llx, ",
bar_nr, bar_res == prefetch ? "Prf" : "Mem",
found_mem64 ? "64" : "",
(unsigned long long)bar_size);
}
ret = pciauto_region_allocate(bar_res, bar_size,
&bar_value, found_mem64);
if (ret)
printf("PCI: Failed autoconfig bar %x\n", bar);
if (!ret) {
/* Write it out and update our limit */
dm_pci_write_config32(dev, bar, (u32)bar_value);
if (found_mem64) {
bar += 4;
#ifdef CONFIG_SYS_PCI_64BIT
dm_pci_write_config32(dev, bar,
(u32)(bar_value >> 32));
#else
/*
* If we are a 64-bit decoder then increment to
* the upper 32 bits of the bar and force it to
* locate in the lower 4GB of memory.
*/
dm_pci_write_config32(dev, bar, 0x00000000);
#endif
}
}
cmdstat |= (bar_response & PCI_BASE_ADDRESS_SPACE) ?
PCI_COMMAND_IO : PCI_COMMAND_MEMORY;
debug("\n");
bar_nr++;
}
/* Configure the expansion ROM address */
if (header_type == PCI_HEADER_TYPE_NORMAL ||
header_type == PCI_HEADER_TYPE_BRIDGE) {
rom_addr = (header_type == PCI_HEADER_TYPE_NORMAL) ?
PCI_ROM_ADDRESS : PCI_ROM_ADDRESS1;
dm_pci_write_config32(dev, rom_addr, 0xfffffffe);
dm_pci_read_config32(dev, rom_addr, &bar_response);
if (bar_response) {
bar_size = -(bar_response & ~1);
debug("PCI Autoconfig: ROM, size=%#x, ",
(unsigned int)bar_size);
if (pciauto_region_allocate(mem, bar_size, &bar_value,
false) == 0) {
dm_pci_write_config32(dev, rom_addr, bar_value);
}
cmdstat |= PCI_COMMAND_MEMORY;
debug("\n");
}
}
/* PCI_COMMAND_IO must be set for VGA device */
dm_pci_read_config16(dev, PCI_CLASS_DEVICE, &class);
if (class == PCI_CLASS_DISPLAY_VGA)
cmdstat |= PCI_COMMAND_IO;
dm_pci_write_config16(dev, PCI_COMMAND, cmdstat);
dm_pci_write_config8(dev, PCI_CACHE_LINE_SIZE,
CFG_SYS_PCI_CACHE_LINE_SIZE);
dm_pci_write_config8(dev, PCI_LATENCY_TIMER, 0x80);
}
/*
* Check if the link of a downstream PCIe port operates correctly.
*
* For that check if the optional Data Link Layer Link Active status gets
* on within a 200ms period or failing that wait until the completion of
* that period and check if link training has shown the completed status
* continuously throughout the second half of that period.
*
* Observation with the ASMedia ASM2824 Gen 3 switch indicates it takes
* 11-44ms to indicate the Data Link Layer Link Active status at 2.5GT/s,
* though it may take a couple of link training iterations.
*/
static bool dm_pciauto_exp_link_stable(struct udevice *dev, int pcie_off)
{
u64 loops = 0, trcount = 0, ntrcount = 0, flips = 0;
bool dllla, lnktr, plnktr;
u16 exp_lnksta;
pci_dev_t bdf;
u64 end;
dm_pci_read_config16(dev, pcie_off + PCI_EXP_LNKSTA, &exp_lnksta);
plnktr = !!(exp_lnksta & PCI_EXP_LNKSTA_LT);
end = get_ticks() + usec_to_tick(200000);
do {
dm_pci_read_config16(dev, pcie_off + PCI_EXP_LNKSTA,
&exp_lnksta);
dllla = !!(exp_lnksta & PCI_EXP_LNKSTA_DLLLA);
lnktr = !!(exp_lnksta & PCI_EXP_LNKSTA_LT);
flips += plnktr ^ lnktr;
if (lnktr) {
ntrcount = 0;
trcount++;
} else {
ntrcount++;
}
loops++;
plnktr = lnktr;
} while (!dllla && get_ticks() < end);
bdf = dm_pci_get_bdf(dev);
debug("PCI Autoconfig: %02x.%02x.%02x: Fixup link: DL active: %u; "
"%3llu flips, %6llu loops of which %6llu while training, "
"final %6llu stable\n",
PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf),
(unsigned int)dllla,
(unsigned long long)flips, (unsigned long long)loops,
(unsigned long long)trcount, (unsigned long long)ntrcount);
return dllla || ntrcount >= loops / 2;
}
/*
* Retrain the link of a downstream PCIe port by hand if necessary.
*
* This is needed at least where a downstream port of the ASMedia ASM2824
* Gen 3 switch is wired to the upstream port of the Pericom PI7C9X2G304
* Gen 2 switch, and observed with the Delock Riser Card PCI Express x1 >
* 2 x PCIe x1 device, P/N 41433, plugged into the SiFive HiFive Unmatched
* board.
*
* In such a configuration the switches are supposed to negotiate the link
* speed of preferably 5.0GT/s, falling back to 2.5GT/s. However the link
* continues switching between the two speeds indefinitely and the data
* link layer never reaches the active state, with link training reported
* repeatedly active ~84% of the time. Forcing the target link speed to
* 2.5GT/s with the upstream ASM2824 device makes the two switches talk to
* each other correctly however. And more interestingly retraining with a
* higher target link speed afterwards lets the two successfully negotiate
* 5.0GT/s.
*
* As this can potentially happen with any device and is cheap in the case
* of correctly operating hardware, let's do it for all downstream ports,
* for root complexes, PCIe switches and PCI/PCI-X to PCIe bridges.
*
* First check if automatic link training may have failed to complete, as
* indicated by the optional Data Link Layer Link Active status being off
* and the Link Bandwidth Management Status indicating that hardware has
* changed the link speed or width in an attempt to correct unreliable
* link operation. If this is the case, then check if the link operates
* correctly by seeing whether it is being trained excessively. If it is,
* then conclude the link is broken.
*
* In that case restrict the speed to 2.5GT/s, observing that the Target
* Link Speed field is sticky and therefore the link will stay restricted
* even after a device reset is later made by an OS that is unaware of the
* problem. With the speed restricted request that the link be retrained
* and check again if the link operates correctly. If not, then set the
* Target Link Speed back to the original value.
*
* This requires the presence of the Link Control 2 register, so make sure
* the PCI Express Capability Version is at least 2. Also don't try, for
* obvious reasons, to limit the speed if 2.5GT/s is the only link speed
* supported.
*/
static void dm_pciauto_exp_fixup_link(struct udevice *dev, int pcie_off)
{
u16 exp_lnksta, exp_lnkctl, exp_lnkctl2;
u16 exp_flags, exp_type, exp_version;
u32 exp_lnkcap;
pci_dev_t bdf;
dm_pci_read_config16(dev, pcie_off + PCI_EXP_FLAGS, &exp_flags);
exp_version = exp_flags & PCI_EXP_FLAGS_VERS;
if (exp_version < 2)
return;
exp_type = (exp_flags & PCI_EXP_FLAGS_TYPE) >> 4;
switch (exp_type) {
case PCI_EXP_TYPE_ROOT_PORT:
case PCI_EXP_TYPE_DOWNSTREAM:
case PCI_EXP_TYPE_PCIE_BRIDGE:
break;
default:
return;
}
dm_pci_read_config32(dev, pcie_off + PCI_EXP_LNKCAP, &exp_lnkcap);
if ((exp_lnkcap & PCI_EXP_LNKCAP_SLS) <= PCI_EXP_LNKCAP_SLS_2_5GB)
return;
dm_pci_read_config16(dev, pcie_off + PCI_EXP_LNKSTA, &exp_lnksta);
if ((exp_lnksta & (PCI_EXP_LNKSTA_LBMS | PCI_EXP_LNKSTA_DLLLA)) !=
PCI_EXP_LNKSTA_LBMS)
return;
if (dm_pciauto_exp_link_stable(dev, pcie_off))
return;
bdf = dm_pci_get_bdf(dev);
printf("PCI Autoconfig: %02x.%02x.%02x: "
"Downstream link non-functional\n",
PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
printf("PCI Autoconfig: %02x.%02x.%02x: "
"Retrying with speed restricted to 2.5GT/s...\n",
PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
dm_pci_read_config16(dev, pcie_off + PCI_EXP_LNKCTL, &exp_lnkctl);
dm_pci_read_config16(dev, pcie_off + PCI_EXP_LNKCTL2, &exp_lnkctl2);
dm_pci_write_config16(dev, pcie_off + PCI_EXP_LNKCTL2,
(exp_lnkctl2 & ~PCI_EXP_LNKCTL2_TLS) |
PCI_EXP_LNKCTL2_TLS_2_5GT);
dm_pci_write_config16(dev, pcie_off + PCI_EXP_LNKCTL,
exp_lnkctl | PCI_EXP_LNKCTL_RL);
if (dm_pciauto_exp_link_stable(dev, pcie_off)) {
printf("PCI Autoconfig: %02x.%02x.%02x: Succeeded!\n",
PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
} else {
printf("PCI Autoconfig: %02x.%02x.%02x: Failed!\n",
PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
dm_pci_write_config16(dev, pcie_off + PCI_EXP_LNKCTL2,
exp_lnkctl2);
dm_pci_write_config16(dev, pcie_off + PCI_EXP_LNKCTL,
exp_lnkctl | PCI_EXP_LNKCTL_RL);
}
}
void dm_pciauto_prescan_setup_bridge(struct udevice *dev, int sub_bus)
{
struct pci_region *pci_mem;
struct pci_region *pci_prefetch;
struct pci_region *pci_io;
u16 cmdstat, prefechable_64;
u8 io_32;
struct udevice *ctlr = pci_get_controller(dev);
struct pci_controller *ctlr_hose = dev_get_uclass_priv(ctlr);
int pcie_off;
pci_mem = ctlr_hose->pci_mem;
pci_prefetch = ctlr_hose->pci_prefetch;
pci_io = ctlr_hose->pci_io;
dm_pci_read_config16(dev, PCI_COMMAND, &cmdstat);
dm_pci_read_config16(dev, PCI_PREF_MEMORY_BASE, &prefechable_64);
prefechable_64 &= PCI_PREF_RANGE_TYPE_MASK;
dm_pci_read_config8(dev, PCI_IO_BASE, &io_32);
io_32 &= PCI_IO_RANGE_TYPE_MASK;
/* Configure bus number registers */
dm_pci_write_config8(dev, PCI_PRIMARY_BUS,
PCI_BUS(dm_pci_get_bdf(dev)) - dev_seq(ctlr));
dm_pci_write_config8(dev, PCI_SECONDARY_BUS, sub_bus - dev_seq(ctlr));
dm_pci_write_config8(dev, PCI_SUBORDINATE_BUS, 0xff);
if (pci_mem) {
/* Round memory allocator to 1MB boundary */
pciauto_region_align(pci_mem, 0x100000);
/*
* Set up memory and I/O filter limits, assume 32-bit
* I/O space
*/
dm_pci_write_config16(dev, PCI_MEMORY_BASE,
((pci_mem->bus_lower & 0xfff00000) >> 16) &
PCI_MEMORY_RANGE_MASK);
cmdstat |= PCI_COMMAND_MEMORY;
}
if (pci_prefetch) {
/* Round memory allocator to 1MB boundary */
pciauto_region_align(pci_prefetch, 0x100000);
/*
* Set up memory and I/O filter limits, assume 32-bit
* I/O space
*/
dm_pci_write_config16(dev, PCI_PREF_MEMORY_BASE,
(((pci_prefetch->bus_lower & 0xfff00000) >> 16) &
PCI_PREF_RANGE_MASK) | prefechable_64);
if (prefechable_64 == PCI_PREF_RANGE_TYPE_64)
#ifdef CONFIG_SYS_PCI_64BIT
dm_pci_write_config32(dev, PCI_PREF_BASE_UPPER32,
pci_prefetch->bus_lower >> 32);
#else
dm_pci_write_config32(dev, PCI_PREF_BASE_UPPER32, 0x0);
#endif
cmdstat |= PCI_COMMAND_MEMORY;
} else {
/* We don't support prefetchable memory for now, so disable */
dm_pci_write_config16(dev, PCI_PREF_MEMORY_BASE, 0xfff0 |
prefechable_64);
dm_pci_write_config16(dev, PCI_PREF_MEMORY_LIMIT, 0x0 |
prefechable_64);
if (prefechable_64 == PCI_PREF_RANGE_TYPE_64) {
dm_pci_write_config16(dev, PCI_PREF_BASE_UPPER32, 0x0);
dm_pci_write_config16(dev, PCI_PREF_LIMIT_UPPER32, 0x0);
}
}
if (pci_io) {
/* Round I/O allocator to 4KB boundary */
pciauto_region_align(pci_io, 0x1000);
dm_pci_write_config8(dev, PCI_IO_BASE,
(((pci_io->bus_lower & 0x0000f000) >> 8) &
PCI_IO_RANGE_MASK) | io_32);
if (io_32 == PCI_IO_RANGE_TYPE_32)
dm_pci_write_config16(dev, PCI_IO_BASE_UPPER16,
(pci_io->bus_lower & 0xffff0000) >> 16);
cmdstat |= PCI_COMMAND_IO;
} else {
/* Disable I/O if unsupported */
dm_pci_write_config8(dev, PCI_IO_BASE, 0xf0 | io_32);
dm_pci_write_config8(dev, PCI_IO_LIMIT, 0x0 | io_32);
if (io_32 == PCI_IO_RANGE_TYPE_32) {
dm_pci_write_config16(dev, PCI_IO_BASE_UPPER16, 0x0);
dm_pci_write_config16(dev, PCI_IO_LIMIT_UPPER16, 0x0);
}
}
/* For PCIe devices see if we need to retrain the link by hand */
pcie_off = dm_pci_find_capability(dev, PCI_CAP_ID_EXP);
if (pcie_off)
dm_pciauto_exp_fixup_link(dev, pcie_off);
/* Enable memory and I/O accesses, enable bus master */
dm_pci_write_config16(dev, PCI_COMMAND, cmdstat | PCI_COMMAND_MASTER);
}
void dm_pciauto_postscan_setup_bridge(struct udevice *dev, int sub_bus)
{
struct pci_region *pci_mem;
struct pci_region *pci_prefetch;
struct pci_region *pci_io;
struct udevice *ctlr = pci_get_controller(dev);
struct pci_controller *ctlr_hose = dev_get_uclass_priv(ctlr);
pci_mem = ctlr_hose->pci_mem;
pci_prefetch = ctlr_hose->pci_prefetch;
pci_io = ctlr_hose->pci_io;
/* Configure bus number registers */
dm_pci_write_config8(dev, PCI_SUBORDINATE_BUS, sub_bus - dev_seq(ctlr));
if (pci_mem) {
/* Round memory allocator to 1MB boundary */
pciauto_region_align(pci_mem, 0x100000);
dm_pci_write_config16(dev, PCI_MEMORY_LIMIT,
((pci_mem->bus_lower - 1) >> 16) &
PCI_MEMORY_RANGE_MASK);
}
if (pci_prefetch) {
u16 prefechable_64;
dm_pci_read_config16(dev, PCI_PREF_MEMORY_LIMIT,
&prefechable_64);
prefechable_64 &= PCI_PREF_RANGE_TYPE_MASK;
/* Round memory allocator to 1MB boundary */
pciauto_region_align(pci_prefetch, 0x100000);
dm_pci_write_config16(dev, PCI_PREF_MEMORY_LIMIT,
(((pci_prefetch->bus_lower - 1) >> 16) &
PCI_PREF_RANGE_MASK) | prefechable_64);
if (prefechable_64 == PCI_PREF_RANGE_TYPE_64)
#ifdef CONFIG_SYS_PCI_64BIT
dm_pci_write_config32(dev, PCI_PREF_LIMIT_UPPER32,
(pci_prefetch->bus_lower - 1) >> 32);
#else
dm_pci_write_config32(dev, PCI_PREF_LIMIT_UPPER32, 0x0);
#endif
}
if (pci_io) {
u8 io_32;
dm_pci_read_config8(dev, PCI_IO_LIMIT,
&io_32);
io_32 &= PCI_IO_RANGE_TYPE_MASK;
/* Round I/O allocator to 4KB boundary */
pciauto_region_align(pci_io, 0x1000);
dm_pci_write_config8(dev, PCI_IO_LIMIT,
((((pci_io->bus_lower - 1) & 0x0000f000) >> 8) &
PCI_IO_RANGE_MASK) | io_32);
if (io_32 == PCI_IO_RANGE_TYPE_32)
dm_pci_write_config16(dev, PCI_IO_LIMIT_UPPER16,
((pci_io->bus_lower - 1) & 0xffff0000) >> 16);
}
}
/*
* HJF: Changed this to return int. I think this is required
* to get the correct result when scanning bridges
*/
int dm_pciauto_config_device(struct udevice *dev)
{
struct pci_region *pci_mem;
struct pci_region *pci_prefetch;
struct pci_region *pci_io;
unsigned int sub_bus = PCI_BUS(dm_pci_get_bdf(dev));
unsigned short class;
struct udevice *ctlr = pci_get_controller(dev);
struct pci_controller *ctlr_hose = dev_get_uclass_priv(ctlr);
int ret;
pci_mem = ctlr_hose->pci_mem;
pci_prefetch = ctlr_hose->pci_prefetch;
pci_io = ctlr_hose->pci_io;
dm_pci_read_config16(dev, PCI_CLASS_DEVICE, &class);
switch (class) {
case PCI_CLASS_BRIDGE_PCI:
debug("PCI Autoconfig: Found P2P bridge, device %d\n",
PCI_DEV(dm_pci_get_bdf(dev)));
dm_pciauto_setup_device(dev, pci_mem, pci_prefetch, pci_io);
ret = dm_pci_hose_probe_bus(dev);
if (ret < 0)
return log_msg_ret("probe", ret);
sub_bus = ret;
break;
case PCI_CLASS_BRIDGE_CARDBUS:
/*
* just do a minimal setup of the bridge,
* let the OS take care of the rest
*/
dm_pciauto_setup_device(dev, pci_mem, pci_prefetch, pci_io);
debug("PCI Autoconfig: Found P2CardBus bridge, device %d\n",
PCI_DEV(dm_pci_get_bdf(dev)));
break;
#if defined(CONFIG_PCIAUTO_SKIP_HOST_BRIDGE)
case PCI_CLASS_BRIDGE_OTHER:
debug("PCI Autoconfig: Skipping bridge device %d\n",
PCI_DEV(dm_pci_get_bdf(dev)));
break;
#endif
#if defined(CONFIG_ARCH_MPC834X)
case PCI_CLASS_BRIDGE_OTHER:
/*
* The host/PCI bridge 1 seems broken in 8349 - it presents
* itself as 'PCI_CLASS_BRIDGE_OTHER' and appears as an _agent_
* device claiming resources io/mem/irq.. we only allow for
* the PIMMR window to be allocated (BAR0 - 1MB size)
*/
debug("PCI Autoconfig: Broken bridge found, only minimal config\n");
dm_pciauto_setup_device(dev, 0, hose->pci_mem,
hose->pci_prefetch, hose->pci_io);
break;
#endif
default:
dm_pciauto_setup_device(dev, pci_mem, pci_prefetch, pci_io);
break;
}
return sub_bus;
}
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