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linux/arch/powerpc/sysdev/ppc4xx_pci.c
Benjamin Herrenschmidt 84d727a109 powerpc/4xx: Add support for ISA holes on 4xx PCI/X/E 
This adds support for ISA memory holes on the PCI, PCI-X and
PCI-E busses of the 4xx platforms. The patch includes changes
to the Bamboo and Canyonlands device-trees to add such a hole,
others can be updated separately.

The ISA memory hole is an additional outbound window configured
in the bridge to generate PCI cycles in the low memory addresses,
thus allowing to access things such as the hard-decoded VGA
aperture at 0xa0000..0xbffff or other similar things. It's made
accessible to userspace via the new legacy_mem file in sysfs for
which support was added by a previous patch.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
2008-12-04 08:02:19 -05:00

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/*
* PCI / PCI-X / PCI-Express support for 4xx parts
*
* Copyright 2007 Ben. Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
*
* Most PCI Express code is coming from Stefan Roese implementation for
* arch/ppc in the Denx tree, slightly reworked by me.
*
* Copyright 2007 DENX Software Engineering, Stefan Roese <sr@denx.de>
*
* Some of that comes itself from a previous implementation for 440SPE only
* by Roland Dreier:
*
* Copyright (c) 2005 Cisco Systems. All rights reserved.
* Roland Dreier <rolandd@cisco.com>
*
*/
#undef DEBUG
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/bootmem.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>
#include <asm/dcr.h>
#include <asm/dcr-regs.h>
#include <mm/mmu_decl.h>
#include "ppc4xx_pci.h"
static int dma_offset_set;
#define U64_TO_U32_LOW(val) ((u32)((val) & 0x00000000ffffffffULL))
#define U64_TO_U32_HIGH(val) ((u32)((val) >> 32))
#define RES_TO_U32_LOW(val) \
((sizeof(resource_size_t) > sizeof(u32)) ? U64_TO_U32_LOW(val) : (val))
#define RES_TO_U32_HIGH(val) \
((sizeof(resource_size_t) > sizeof(u32)) ? U64_TO_U32_HIGH(val) : (0))
static inline int ppc440spe_revA(void)
{
/* Catch both 440SPe variants, with and without RAID6 support */
if ((mfspr(SPRN_PVR) & 0xffefffff) == 0x53421890)
return 1;
else
return 0;
}
static void fixup_ppc4xx_pci_bridge(struct pci_dev *dev)
{
struct pci_controller *hose;
int i;
if (dev->devfn != 0 || dev->bus->self != NULL)
return;
hose = pci_bus_to_host(dev->bus);
if (hose == NULL)
return;
if (!of_device_is_compatible(hose->dn, "ibm,plb-pciex") &&
!of_device_is_compatible(hose->dn, "ibm,plb-pcix") &&
!of_device_is_compatible(hose->dn, "ibm,plb-pci"))
return;
if (of_device_is_compatible(hose->dn, "ibm,plb440epx-pci") ||
of_device_is_compatible(hose->dn, "ibm,plb440grx-pci")) {
hose->indirect_type |= PPC_INDIRECT_TYPE_BROKEN_MRM;
}
/* Hide the PCI host BARs from the kernel as their content doesn't
* fit well in the resource management
*/
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
dev->resource[i].start = dev->resource[i].end = 0;
dev->resource[i].flags = 0;
}
printk(KERN_INFO "PCI: Hiding 4xx host bridge resources %s\n",
pci_name(dev));
}
DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, fixup_ppc4xx_pci_bridge);
static int __init ppc4xx_parse_dma_ranges(struct pci_controller *hose,
void __iomem *reg,
struct resource *res)
{
u64 size;
const u32 *ranges;
int rlen;
int pna = of_n_addr_cells(hose->dn);
int np = pna + 5;
/* Default */
res->start = 0;
size = 0x80000000;
res->end = size - 1;
res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH;
/* Get dma-ranges property */
ranges = of_get_property(hose->dn, "dma-ranges", &rlen);
if (ranges == NULL)
goto out;
/* Walk it */
while ((rlen -= np * 4) >= 0) {
u32 pci_space = ranges[0];
u64 pci_addr = of_read_number(ranges + 1, 2);
u64 cpu_addr = of_translate_dma_address(hose->dn, ranges + 3);
size = of_read_number(ranges + pna + 3, 2);
ranges += np;
if (cpu_addr == OF_BAD_ADDR || size == 0)
continue;
/* We only care about memory */
if ((pci_space & 0x03000000) != 0x02000000)
continue;
/* We currently only support memory at 0, and pci_addr
* within 32 bits space
*/
if (cpu_addr != 0 || pci_addr > 0xffffffff) {
printk(KERN_WARNING "%s: Ignored unsupported dma range"
" 0x%016llx...0x%016llx -> 0x%016llx\n",
hose->dn->full_name,
pci_addr, pci_addr + size - 1, cpu_addr);
continue;
}
/* Check if not prefetchable */
if (!(pci_space & 0x40000000))
res->flags &= ~IORESOURCE_PREFETCH;
/* Use that */
res->start = pci_addr;
/* Beware of 32 bits resources */
if (sizeof(resource_size_t) == sizeof(u32) &&
(pci_addr + size) > 0x100000000ull)
res->end = 0xffffffff;
else
res->end = res->start + size - 1;
break;
}
/* We only support one global DMA offset */
if (dma_offset_set && pci_dram_offset != res->start) {
printk(KERN_ERR "%s: dma-ranges(s) mismatch\n",
hose->dn->full_name);
return -ENXIO;
}
/* Check that we can fit all of memory as we don't support
* DMA bounce buffers
*/
if (size < total_memory) {
printk(KERN_ERR "%s: dma-ranges too small "
"(size=%llx total_memory=%llx)\n",
hose->dn->full_name, size, (u64)total_memory);
return -ENXIO;
}
/* Check we are a power of 2 size and that base is a multiple of size*/
if ((size & (size - 1)) != 0 ||
(res->start & (size - 1)) != 0) {
printk(KERN_ERR "%s: dma-ranges unaligned\n",
hose->dn->full_name);
return -ENXIO;
}
/* Check that we are fully contained within 32 bits space */
if (res->end > 0xffffffff) {
printk(KERN_ERR "%s: dma-ranges outside of 32 bits space\n",
hose->dn->full_name);
return -ENXIO;
}
out:
dma_offset_set = 1;
pci_dram_offset = res->start;
printk(KERN_INFO "4xx PCI DMA offset set to 0x%08lx\n",
pci_dram_offset);
return 0;
}
/*
* 4xx PCI 2.x part
*/
static int __init ppc4xx_setup_one_pci_PMM(struct pci_controller *hose,
void __iomem *reg,
u64 plb_addr,
u64 pci_addr,
u64 size,
unsigned int flags,
int index)
{
u32 ma, pcila, pciha;
if ((plb_addr + size) > 0xffffffffull || !is_power_of_2(size) ||
size < 0x1000 || (plb_addr & (size - 1)) != 0) {
printk(KERN_WARNING "%s: Resource out of range\n",
hose->dn->full_name);
return -1;
}
ma = (0xffffffffu << ilog2(size)) | 1;
if (flags & IORESOURCE_PREFETCH)
ma |= 2;
pciha = RES_TO_U32_HIGH(pci_addr);
pcila = RES_TO_U32_LOW(pci_addr);
writel(plb_addr, reg + PCIL0_PMM0LA + (0x10 * index));
writel(pcila, reg + PCIL0_PMM0PCILA + (0x10 * index));
writel(pciha, reg + PCIL0_PMM0PCIHA + (0x10 * index));
writel(ma, reg + PCIL0_PMM0MA + (0x10 * index));
return 0;
}
static void __init ppc4xx_configure_pci_PMMs(struct pci_controller *hose,
void __iomem *reg)
{
int i, j, found_isa_hole = 0;
/* Setup outbound memory windows */
for (i = j = 0; i < 3; i++) {
struct resource *res = &hose->mem_resources[i];
/* we only care about memory windows */
if (!(res->flags & IORESOURCE_MEM))
continue;
if (j > 2) {
printk(KERN_WARNING "%s: Too many ranges\n",
hose->dn->full_name);
break;
}
/* Configure the resource */
if (ppc4xx_setup_one_pci_PMM(hose, reg,
res->start,
res->start - hose->pci_mem_offset,
res->end + 1 - res->start,
res->flags,
j) == 0) {
j++;
/* If the resource PCI address is 0 then we have our
* ISA memory hole
*/
if (res->start == hose->pci_mem_offset)
found_isa_hole = 1;
}
}
/* Handle ISA memory hole if not already covered */
if (j <= 2 && !found_isa_hole && hose->isa_mem_size)
if (ppc4xx_setup_one_pci_PMM(hose, reg, hose->isa_mem_phys, 0,
hose->isa_mem_size, 0, j) == 0)
printk(KERN_INFO "%s: Legacy ISA memory support enabled\n",
hose->dn->full_name);
}
static void __init ppc4xx_configure_pci_PTMs(struct pci_controller *hose,
void __iomem *reg,
const struct resource *res)
{
resource_size_t size = res->end - res->start + 1;
u32 sa;
/* Calculate window size */
sa = (0xffffffffu << ilog2(size)) | 1;
sa |= 0x1;
/* RAM is always at 0 local for now */
writel(0, reg + PCIL0_PTM1LA);
writel(sa, reg + PCIL0_PTM1MS);
/* Map on PCI side */
early_write_config_dword(hose, hose->first_busno, 0,
PCI_BASE_ADDRESS_1, res->start);
early_write_config_dword(hose, hose->first_busno, 0,
PCI_BASE_ADDRESS_2, 0x00000000);
early_write_config_word(hose, hose->first_busno, 0,
PCI_COMMAND, 0x0006);
}
static void __init ppc4xx_probe_pci_bridge(struct device_node *np)
{
/* NYI */
struct resource rsrc_cfg;
struct resource rsrc_reg;
struct resource dma_window;
struct pci_controller *hose = NULL;
void __iomem *reg = NULL;
const int *bus_range;
int primary = 0;
/* Check if device is enabled */
if (!of_device_is_available(np)) {
printk(KERN_INFO "%s: Port disabled via device-tree\n",
np->full_name);
return;
}
/* Fetch config space registers address */
if (of_address_to_resource(np, 0, &rsrc_cfg)) {
printk(KERN_ERR "%s: Can't get PCI config register base !",
np->full_name);
return;
}
/* Fetch host bridge internal registers address */
if (of_address_to_resource(np, 3, &rsrc_reg)) {
printk(KERN_ERR "%s: Can't get PCI internal register base !",
np->full_name);
return;
}
/* Check if primary bridge */
if (of_get_property(np, "primary", NULL))
primary = 1;
/* Get bus range if any */
bus_range = of_get_property(np, "bus-range", NULL);
/* Map registers */
reg = ioremap(rsrc_reg.start, rsrc_reg.end + 1 - rsrc_reg.start);
if (reg == NULL) {
printk(KERN_ERR "%s: Can't map registers !", np->full_name);
goto fail;
}
/* Allocate the host controller data structure */
hose = pcibios_alloc_controller(np);
if (!hose)
goto fail;
hose->first_busno = bus_range ? bus_range[0] : 0x0;
hose->last_busno = bus_range ? bus_range[1] : 0xff;
/* Setup config space */
setup_indirect_pci(hose, rsrc_cfg.start, rsrc_cfg.start + 0x4, 0);
/* Disable all windows */
writel(0, reg + PCIL0_PMM0MA);
writel(0, reg + PCIL0_PMM1MA);
writel(0, reg + PCIL0_PMM2MA);
writel(0, reg + PCIL0_PTM1MS);
writel(0, reg + PCIL0_PTM2MS);
/* Parse outbound mapping resources */
pci_process_bridge_OF_ranges(hose, np, primary);
/* Parse inbound mapping resources */
if (ppc4xx_parse_dma_ranges(hose, reg, &dma_window) != 0)
goto fail;
/* Configure outbound ranges POMs */
ppc4xx_configure_pci_PMMs(hose, reg);
/* Configure inbound ranges PIMs */
ppc4xx_configure_pci_PTMs(hose, reg, &dma_window);
/* We don't need the registers anymore */
iounmap(reg);
return;
fail:
if (hose)
pcibios_free_controller(hose);
if (reg)
iounmap(reg);
}
/*
* 4xx PCI-X part
*/
static int __init ppc4xx_setup_one_pcix_POM(struct pci_controller *hose,
void __iomem *reg,
u64 plb_addr,
u64 pci_addr,
u64 size,
unsigned int flags,
int index)
{
u32 lah, lal, pciah, pcial, sa;
if (!is_power_of_2(size) || size < 0x1000 ||
(plb_addr & (size - 1)) != 0) {
printk(KERN_WARNING "%s: Resource out of range\n",
hose->dn->full_name);
return -1;
}
/* Calculate register values */
lah = RES_TO_U32_HIGH(plb_addr);
lal = RES_TO_U32_LOW(plb_addr);
pciah = RES_TO_U32_HIGH(pci_addr);
pcial = RES_TO_U32_LOW(pci_addr);
sa = (0xffffffffu << ilog2(size)) | 0x1;
/* Program register values */
if (index == 0) {
writel(lah, reg + PCIX0_POM0LAH);
writel(lal, reg + PCIX0_POM0LAL);
writel(pciah, reg + PCIX0_POM0PCIAH);
writel(pcial, reg + PCIX0_POM0PCIAL);
writel(sa, reg + PCIX0_POM0SA);
} else {
writel(lah, reg + PCIX0_POM1LAH);
writel(lal, reg + PCIX0_POM1LAL);
writel(pciah, reg + PCIX0_POM1PCIAH);
writel(pcial, reg + PCIX0_POM1PCIAL);
writel(sa, reg + PCIX0_POM1SA);
}
return 0;
}
static void __init ppc4xx_configure_pcix_POMs(struct pci_controller *hose,
void __iomem *reg)
{
int i, j, found_isa_hole = 0;
/* Setup outbound memory windows */
for (i = j = 0; i < 3; i++) {
struct resource *res = &hose->mem_resources[i];
/* we only care about memory windows */
if (!(res->flags & IORESOURCE_MEM))
continue;
if (j > 1) {
printk(KERN_WARNING "%s: Too many ranges\n",
hose->dn->full_name);
break;
}
/* Configure the resource */
if (ppc4xx_setup_one_pcix_POM(hose, reg,
res->start,
res->start - hose->pci_mem_offset,
res->end + 1 - res->start,
res->flags,
j) == 0) {
j++;
/* If the resource PCI address is 0 then we have our
* ISA memory hole
*/
if (res->start == hose->pci_mem_offset)
found_isa_hole = 1;
}
}
/* Handle ISA memory hole if not already covered */
if (j <= 1 && !found_isa_hole && hose->isa_mem_size)
if (ppc4xx_setup_one_pcix_POM(hose, reg, hose->isa_mem_phys, 0,
hose->isa_mem_size, 0, j) == 0)
printk(KERN_INFO "%s: Legacy ISA memory support enabled\n",
hose->dn->full_name);
}
static void __init ppc4xx_configure_pcix_PIMs(struct pci_controller *hose,
void __iomem *reg,
const struct resource *res,
int big_pim,
int enable_msi_hole)
{
resource_size_t size = res->end - res->start + 1;
u32 sa;
/* RAM is always at 0 */
writel(0x00000000, reg + PCIX0_PIM0LAH);
writel(0x00000000, reg + PCIX0_PIM0LAL);
/* Calculate window size */
sa = (0xffffffffu << ilog2(size)) | 1;
sa |= 0x1;
if (res->flags & IORESOURCE_PREFETCH)
sa |= 0x2;
if (enable_msi_hole)
sa |= 0x4;
writel(sa, reg + PCIX0_PIM0SA);
if (big_pim)
writel(0xffffffff, reg + PCIX0_PIM0SAH);
/* Map on PCI side */
writel(0x00000000, reg + PCIX0_BAR0H);
writel(res->start, reg + PCIX0_BAR0L);
writew(0x0006, reg + PCIX0_COMMAND);
}
static void __init ppc4xx_probe_pcix_bridge(struct device_node *np)
{
struct resource rsrc_cfg;
struct resource rsrc_reg;
struct resource dma_window;
struct pci_controller *hose = NULL;
void __iomem *reg = NULL;
const int *bus_range;
int big_pim = 0, msi = 0, primary = 0;
/* Fetch config space registers address */
if (of_address_to_resource(np, 0, &rsrc_cfg)) {
printk(KERN_ERR "%s:Can't get PCI-X config register base !",
np->full_name);
return;
}
/* Fetch host bridge internal registers address */
if (of_address_to_resource(np, 3, &rsrc_reg)) {
printk(KERN_ERR "%s: Can't get PCI-X internal register base !",
np->full_name);
return;
}
/* Check if it supports large PIMs (440GX) */
if (of_get_property(np, "large-inbound-windows", NULL))
big_pim = 1;
/* Check if we should enable MSIs inbound hole */
if (of_get_property(np, "enable-msi-hole", NULL))
msi = 1;
/* Check if primary bridge */
if (of_get_property(np, "primary", NULL))
primary = 1;
/* Get bus range if any */
bus_range = of_get_property(np, "bus-range", NULL);
/* Map registers */
reg = ioremap(rsrc_reg.start, rsrc_reg.end + 1 - rsrc_reg.start);
if (reg == NULL) {
printk(KERN_ERR "%s: Can't map registers !", np->full_name);
goto fail;
}
/* Allocate the host controller data structure */
hose = pcibios_alloc_controller(np);
if (!hose)
goto fail;
hose->first_busno = bus_range ? bus_range[0] : 0x0;
hose->last_busno = bus_range ? bus_range[1] : 0xff;
/* Setup config space */
setup_indirect_pci(hose, rsrc_cfg.start, rsrc_cfg.start + 0x4, 0);
/* Disable all windows */
writel(0, reg + PCIX0_POM0SA);
writel(0, reg + PCIX0_POM1SA);
writel(0, reg + PCIX0_POM2SA);
writel(0, reg + PCIX0_PIM0SA);
writel(0, reg + PCIX0_PIM1SA);
writel(0, reg + PCIX0_PIM2SA);
if (big_pim) {
writel(0, reg + PCIX0_PIM0SAH);
writel(0, reg + PCIX0_PIM2SAH);
}
/* Parse outbound mapping resources */
pci_process_bridge_OF_ranges(hose, np, primary);
/* Parse inbound mapping resources */
if (ppc4xx_parse_dma_ranges(hose, reg, &dma_window) != 0)
goto fail;
/* Configure outbound ranges POMs */
ppc4xx_configure_pcix_POMs(hose, reg);
/* Configure inbound ranges PIMs */
ppc4xx_configure_pcix_PIMs(hose, reg, &dma_window, big_pim, msi);
/* We don't need the registers anymore */
iounmap(reg);
return;
fail:
if (hose)
pcibios_free_controller(hose);
if (reg)
iounmap(reg);
}
#ifdef CONFIG_PPC4xx_PCI_EXPRESS
/*
* 4xx PCI-Express part
*
* We support 3 parts currently based on the compatible property:
*
* ibm,plb-pciex-440spe
* ibm,plb-pciex-405ex
* ibm,plb-pciex-460ex
*
* Anything else will be rejected for now as they are all subtly
* different unfortunately.
*
*/
#define MAX_PCIE_BUS_MAPPED 0x40
struct ppc4xx_pciex_port
{
struct pci_controller *hose;
struct device_node *node;
unsigned int index;
int endpoint;
int link;
int has_ibpre;
unsigned int sdr_base;
dcr_host_t dcrs;
struct resource cfg_space;
struct resource utl_regs;
void __iomem *utl_base;
};
static struct ppc4xx_pciex_port *ppc4xx_pciex_ports;
static unsigned int ppc4xx_pciex_port_count;
struct ppc4xx_pciex_hwops
{
int (*core_init)(struct device_node *np);
int (*port_init_hw)(struct ppc4xx_pciex_port *port);
int (*setup_utl)(struct ppc4xx_pciex_port *port);
};
static struct ppc4xx_pciex_hwops *ppc4xx_pciex_hwops;
#ifdef CONFIG_44x
/* Check various reset bits of the 440SPe PCIe core */
static int __init ppc440spe_pciex_check_reset(struct device_node *np)
{
u32 valPE0, valPE1, valPE2;
int err = 0;
/* SDR0_PEGPLLLCT1 reset */
if (!(mfdcri(SDR0, PESDR0_PLLLCT1) & 0x01000000)) {
/*
* the PCIe core was probably already initialised
* by firmware - let's re-reset RCSSET regs
*
* -- Shouldn't we also re-reset the whole thing ? -- BenH
*/
pr_debug("PCIE: SDR0_PLLLCT1 already reset.\n");
mtdcri(SDR0, PESDR0_440SPE_RCSSET, 0x01010000);
mtdcri(SDR0, PESDR1_440SPE_RCSSET, 0x01010000);
mtdcri(SDR0, PESDR2_440SPE_RCSSET, 0x01010000);
}
valPE0 = mfdcri(SDR0, PESDR0_440SPE_RCSSET);
valPE1 = mfdcri(SDR0, PESDR1_440SPE_RCSSET);
valPE2 = mfdcri(SDR0, PESDR2_440SPE_RCSSET);
/* SDR0_PExRCSSET rstgu */
if (!(valPE0 & 0x01000000) ||
!(valPE1 & 0x01000000) ||
!(valPE2 & 0x01000000)) {
printk(KERN_INFO "PCIE: SDR0_PExRCSSET rstgu error\n");
err = -1;
}
/* SDR0_PExRCSSET rstdl */
if (!(valPE0 & 0x00010000) ||
!(valPE1 & 0x00010000) ||
!(valPE2 & 0x00010000)) {
printk(KERN_INFO "PCIE: SDR0_PExRCSSET rstdl error\n");
err = -1;
}
/* SDR0_PExRCSSET rstpyn */
if ((valPE0 & 0x00001000) ||
(valPE1 & 0x00001000) ||
(valPE2 & 0x00001000)) {
printk(KERN_INFO "PCIE: SDR0_PExRCSSET rstpyn error\n");
err = -1;
}
/* SDR0_PExRCSSET hldplb */
if ((valPE0 & 0x10000000) ||
(valPE1 & 0x10000000) ||
(valPE2 & 0x10000000)) {
printk(KERN_INFO "PCIE: SDR0_PExRCSSET hldplb error\n");
err = -1;
}
/* SDR0_PExRCSSET rdy */
if ((valPE0 & 0x00100000) ||
(valPE1 & 0x00100000) ||
(valPE2 & 0x00100000)) {
printk(KERN_INFO "PCIE: SDR0_PExRCSSET rdy error\n");
err = -1;
}
/* SDR0_PExRCSSET shutdown */
if ((valPE0 & 0x00000100) ||
(valPE1 & 0x00000100) ||
(valPE2 & 0x00000100)) {
printk(KERN_INFO "PCIE: SDR0_PExRCSSET shutdown error\n");
err = -1;
}
return err;
}
/* Global PCIe core initializations for 440SPe core */
static int __init ppc440spe_pciex_core_init(struct device_node *np)
{
int time_out = 20;
/* Set PLL clock receiver to LVPECL */
dcri_clrset(SDR0, PESDR0_PLLLCT1, 0, 1 << 28);
/* Shouldn't we do all the calibration stuff etc... here ? */
if (ppc440spe_pciex_check_reset(np))
return -ENXIO;
if (!(mfdcri(SDR0, PESDR0_PLLLCT2) & 0x10000)) {
printk(KERN_INFO "PCIE: PESDR_PLLCT2 resistance calibration "
"failed (0x%08x)\n",
mfdcri(SDR0, PESDR0_PLLLCT2));
return -1;
}
/* De-assert reset of PCIe PLL, wait for lock */
dcri_clrset(SDR0, PESDR0_PLLLCT1, 1 << 24, 0);
udelay(3);
while (time_out) {
if (!(mfdcri(SDR0, PESDR0_PLLLCT3) & 0x10000000)) {
time_out--;
udelay(1);
} else
break;
}
if (!time_out) {
printk(KERN_INFO "PCIE: VCO output not locked\n");
return -1;
}
pr_debug("PCIE initialization OK\n");
return 3;
}
static int ppc440spe_pciex_init_port_hw(struct ppc4xx_pciex_port *port)
{
u32 val = 1 << 24;
if (port->endpoint)
val = PTYPE_LEGACY_ENDPOINT << 20;
else
val = PTYPE_ROOT_PORT << 20;
if (port->index == 0)
val |= LNKW_X8 << 12;
else
val |= LNKW_X4 << 12;
mtdcri(SDR0, port->sdr_base + PESDRn_DLPSET, val);
mtdcri(SDR0, port->sdr_base + PESDRn_UTLSET1, 0x20222222);
if (ppc440spe_revA())
mtdcri(SDR0, port->sdr_base + PESDRn_UTLSET2, 0x11000000);
mtdcri(SDR0, port->sdr_base + PESDRn_440SPE_HSSL0SET1, 0x35000000);
mtdcri(SDR0, port->sdr_base + PESDRn_440SPE_HSSL1SET1, 0x35000000);
mtdcri(SDR0, port->sdr_base + PESDRn_440SPE_HSSL2SET1, 0x35000000);
mtdcri(SDR0, port->sdr_base + PESDRn_440SPE_HSSL3SET1, 0x35000000);
if (port->index == 0) {
mtdcri(SDR0, port->sdr_base + PESDRn_440SPE_HSSL4SET1,
0x35000000);
mtdcri(SDR0, port->sdr_base + PESDRn_440SPE_HSSL5SET1,
0x35000000);
mtdcri(SDR0, port->sdr_base + PESDRn_440SPE_HSSL6SET1,
0x35000000);
mtdcri(SDR0, port->sdr_base + PESDRn_440SPE_HSSL7SET1,
0x35000000);
}
dcri_clrset(SDR0, port->sdr_base + PESDRn_RCSSET,
(1 << 24) | (1 << 16), 1 << 12);
return 0;
}
static int ppc440speA_pciex_init_port_hw(struct ppc4xx_pciex_port *port)
{
return ppc440spe_pciex_init_port_hw(port);
}
static int ppc440speB_pciex_init_port_hw(struct ppc4xx_pciex_port *port)
{
int rc = ppc440spe_pciex_init_port_hw(port);
port->has_ibpre = 1;
return rc;
}
static int ppc440speA_pciex_init_utl(struct ppc4xx_pciex_port *port)
{
/* XXX Check what that value means... I hate magic */
dcr_write(port->dcrs, DCRO_PEGPL_SPECIAL, 0x68782800);
/*
* Set buffer allocations and then assert VRB and TXE.
*/
out_be32(port->utl_base + PEUTL_OUTTR, 0x08000000);
out_be32(port->utl_base + PEUTL_INTR, 0x02000000);
out_be32(port->utl_base + PEUTL_OPDBSZ, 0x10000000);
out_be32(port->utl_base + PEUTL_PBBSZ, 0x53000000);
out_be32(port->utl_base + PEUTL_IPHBSZ, 0x08000000);
out_be32(port->utl_base + PEUTL_IPDBSZ, 0x10000000);
out_be32(port->utl_base + PEUTL_RCIRQEN, 0x00f00000);
out_be32(port->utl_base + PEUTL_PCTL, 0x80800066);
return 0;
}
static int ppc440speB_pciex_init_utl(struct ppc4xx_pciex_port *port)
{
/* Report CRS to the operating system */
out_be32(port->utl_base + PEUTL_PBCTL, 0x08000000);
return 0;
}
static struct ppc4xx_pciex_hwops ppc440speA_pcie_hwops __initdata =
{
.core_init = ppc440spe_pciex_core_init,
.port_init_hw = ppc440speA_pciex_init_port_hw,
.setup_utl = ppc440speA_pciex_init_utl,
};
static struct ppc4xx_pciex_hwops ppc440speB_pcie_hwops __initdata =
{
.core_init = ppc440spe_pciex_core_init,
.port_init_hw = ppc440speB_pciex_init_port_hw,
.setup_utl = ppc440speB_pciex_init_utl,
};
static int __init ppc460ex_pciex_core_init(struct device_node *np)
{
/* Nothing to do, return 2 ports */
return 2;
}
static int ppc460ex_pciex_init_port_hw(struct ppc4xx_pciex_port *port)
{
u32 val;
u32 utlset1;
if (port->endpoint)
val = PTYPE_LEGACY_ENDPOINT << 20;
else
val = PTYPE_ROOT_PORT << 20;
if (port->index == 0) {
val |= LNKW_X1 << 12;
utlset1 = 0x20000000;
} else {
val |= LNKW_X4 << 12;
utlset1 = 0x20101101;
}
mtdcri(SDR0, port->sdr_base + PESDRn_DLPSET, val);
mtdcri(SDR0, port->sdr_base + PESDRn_UTLSET1, utlset1);
mtdcri(SDR0, port->sdr_base + PESDRn_UTLSET2, 0x01210000);
switch (port->index) {
case 0:
mtdcri(SDR0, PESDR0_460EX_L0CDRCTL, 0x00003230);
mtdcri(SDR0, PESDR0_460EX_L0DRV, 0x00000130);
mtdcri(SDR0, PESDR0_460EX_L0CLK, 0x00000006);
mtdcri(SDR0, PESDR0_460EX_PHY_CTL_RST,0x10000000);
break;
case 1:
mtdcri(SDR0, PESDR1_460EX_L0CDRCTL, 0x00003230);
mtdcri(SDR0, PESDR1_460EX_L1CDRCTL, 0x00003230);
mtdcri(SDR0, PESDR1_460EX_L2CDRCTL, 0x00003230);
mtdcri(SDR0, PESDR1_460EX_L3CDRCTL, 0x00003230);
mtdcri(SDR0, PESDR1_460EX_L0DRV, 0x00000130);
mtdcri(SDR0, PESDR1_460EX_L1DRV, 0x00000130);
mtdcri(SDR0, PESDR1_460EX_L2DRV, 0x00000130);
mtdcri(SDR0, PESDR1_460EX_L3DRV, 0x00000130);
mtdcri(SDR0, PESDR1_460EX_L0CLK, 0x00000006);
mtdcri(SDR0, PESDR1_460EX_L1CLK, 0x00000006);
mtdcri(SDR0, PESDR1_460EX_L2CLK, 0x00000006);
mtdcri(SDR0, PESDR1_460EX_L3CLK, 0x00000006);
mtdcri(SDR0, PESDR1_460EX_PHY_CTL_RST,0x10000000);
break;
}
mtdcri(SDR0, port->sdr_base + PESDRn_RCSSET,
mfdcri(SDR0, port->sdr_base + PESDRn_RCSSET) |
(PESDRx_RCSSET_RSTGU | PESDRx_RCSSET_RSTPYN));
/* Poll for PHY reset */
/* XXX FIXME add timeout */
switch (port->index) {
case 0:
while (!(mfdcri(SDR0, PESDR0_460EX_RSTSTA) & 0x1))
udelay(10);
break;
case 1:
while (!(mfdcri(SDR0, PESDR1_460EX_RSTSTA) & 0x1))
udelay(10);
break;
}
mtdcri(SDR0, port->sdr_base + PESDRn_RCSSET,
(mfdcri(SDR0, port->sdr_base + PESDRn_RCSSET) &
~(PESDRx_RCSSET_RSTGU | PESDRx_RCSSET_RSTDL)) |
PESDRx_RCSSET_RSTPYN);
port->has_ibpre = 1;
return 0;
}
static int ppc460ex_pciex_init_utl(struct ppc4xx_pciex_port *port)
{
dcr_write(port->dcrs, DCRO_PEGPL_SPECIAL, 0x0);
/*
* Set buffer allocations and then assert VRB and TXE.
*/
out_be32(port->utl_base + PEUTL_PBCTL, 0x0800000c);
out_be32(port->utl_base + PEUTL_OUTTR, 0x08000000);
out_be32(port->utl_base + PEUTL_INTR, 0x02000000);
out_be32(port->utl_base + PEUTL_OPDBSZ, 0x04000000);
out_be32(port->utl_base + PEUTL_PBBSZ, 0x00000000);
out_be32(port->utl_base + PEUTL_IPHBSZ, 0x02000000);
out_be32(port->utl_base + PEUTL_IPDBSZ, 0x04000000);
out_be32(port->utl_base + PEUTL_RCIRQEN,0x00f00000);
out_be32(port->utl_base + PEUTL_PCTL, 0x80800066);
return 0;
}
static struct ppc4xx_pciex_hwops ppc460ex_pcie_hwops __initdata =
{
.core_init = ppc460ex_pciex_core_init,
.port_init_hw = ppc460ex_pciex_init_port_hw,
.setup_utl = ppc460ex_pciex_init_utl,
};
#endif /* CONFIG_44x */
#ifdef CONFIG_40x
static int __init ppc405ex_pciex_core_init(struct device_node *np)
{
/* Nothing to do, return 2 ports */
return 2;
}
static void ppc405ex_pcie_phy_reset(struct ppc4xx_pciex_port *port)
{
/* Assert the PE0_PHY reset */
mtdcri(SDR0, port->sdr_base + PESDRn_RCSSET, 0x01010000);
msleep(1);
/* deassert the PE0_hotreset */
if (port->endpoint)
mtdcri(SDR0, port->sdr_base + PESDRn_RCSSET, 0x01111000);
else
mtdcri(SDR0, port->sdr_base + PESDRn_RCSSET, 0x01101000);
/* poll for phy !reset */
/* XXX FIXME add timeout */
while (!(mfdcri(SDR0, port->sdr_base + PESDRn_405EX_PHYSTA) & 0x00001000))
;
/* deassert the PE0_gpl_utl_reset */
mtdcri(SDR0, port->sdr_base + PESDRn_RCSSET, 0x00101000);
}
static int ppc405ex_pciex_init_port_hw(struct ppc4xx_pciex_port *port)
{
u32 val;
if (port->endpoint)
val = PTYPE_LEGACY_ENDPOINT;
else
val = PTYPE_ROOT_PORT;
mtdcri(SDR0, port->sdr_base + PESDRn_DLPSET,
1 << 24 | val << 20 | LNKW_X1 << 12);
mtdcri(SDR0, port->sdr_base + PESDRn_UTLSET1, 0x00000000);
mtdcri(SDR0, port->sdr_base + PESDRn_UTLSET2, 0x01010000);
mtdcri(SDR0, port->sdr_base + PESDRn_405EX_PHYSET1, 0x720F0000);
mtdcri(SDR0, port->sdr_base + PESDRn_405EX_PHYSET2, 0x70600003);
/*
* Only reset the PHY when no link is currently established.
* This is for the Atheros PCIe board which has problems to establish
* the link (again) after this PHY reset. All other currently tested
* PCIe boards don't show this problem.
* This has to be re-tested and fixed in a later release!
*/
val = mfdcri(SDR0, port->sdr_base + PESDRn_LOOP);
if (!(val & 0x00001000))
ppc405ex_pcie_phy_reset(port);
dcr_write(port->dcrs, DCRO_PEGPL_CFG, 0x10000000); /* guarded on */
port->has_ibpre = 1;
return 0;
}
static int ppc405ex_pciex_init_utl(struct ppc4xx_pciex_port *port)
{
dcr_write(port->dcrs, DCRO_PEGPL_SPECIAL, 0x0);
/*
* Set buffer allocations and then assert VRB and TXE.
*/
out_be32(port->utl_base + PEUTL_OUTTR, 0x02000000);
out_be32(port->utl_base + PEUTL_INTR, 0x02000000);
out_be32(port->utl_base + PEUTL_OPDBSZ, 0x04000000);
out_be32(port->utl_base + PEUTL_PBBSZ, 0x21000000);
out_be32(port->utl_base + PEUTL_IPHBSZ, 0x02000000);
out_be32(port->utl_base + PEUTL_IPDBSZ, 0x04000000);
out_be32(port->utl_base + PEUTL_RCIRQEN, 0x00f00000);
out_be32(port->utl_base + PEUTL_PCTL, 0x80800066);
out_be32(port->utl_base + PEUTL_PBCTL, 0x08000000);
return 0;
}
static struct ppc4xx_pciex_hwops ppc405ex_pcie_hwops __initdata =
{
.core_init = ppc405ex_pciex_core_init,
.port_init_hw = ppc405ex_pciex_init_port_hw,
.setup_utl = ppc405ex_pciex_init_utl,
};
#endif /* CONFIG_40x */
/* Check that the core has been initied and if not, do it */
static int __init ppc4xx_pciex_check_core_init(struct device_node *np)
{
static int core_init;
int count = -ENODEV;
if (core_init++)
return 0;
#ifdef CONFIG_44x
if (of_device_is_compatible(np, "ibm,plb-pciex-440spe")) {
if (ppc440spe_revA())
ppc4xx_pciex_hwops = &ppc440speA_pcie_hwops;
else
ppc4xx_pciex_hwops = &ppc440speB_pcie_hwops;
}
if (of_device_is_compatible(np, "ibm,plb-pciex-460ex"))
ppc4xx_pciex_hwops = &ppc460ex_pcie_hwops;
#endif /* CONFIG_44x */
#ifdef CONFIG_40x
if (of_device_is_compatible(np, "ibm,plb-pciex-405ex"))
ppc4xx_pciex_hwops = &ppc405ex_pcie_hwops;
#endif
if (ppc4xx_pciex_hwops == NULL) {
printk(KERN_WARNING "PCIE: unknown host type %s\n",
np->full_name);
return -ENODEV;
}
count = ppc4xx_pciex_hwops->core_init(np);
if (count > 0) {
ppc4xx_pciex_ports =
kzalloc(count * sizeof(struct ppc4xx_pciex_port),
GFP_KERNEL);
if (ppc4xx_pciex_ports) {
ppc4xx_pciex_port_count = count;
return 0;
}
printk(KERN_WARNING "PCIE: failed to allocate ports array\n");
return -ENOMEM;
}
return -ENODEV;
}
static void __init ppc4xx_pciex_port_init_mapping(struct ppc4xx_pciex_port *port)
{
/* We map PCI Express configuration based on the reg property */
dcr_write(port->dcrs, DCRO_PEGPL_CFGBAH,
RES_TO_U32_HIGH(port->cfg_space.start));
dcr_write(port->dcrs, DCRO_PEGPL_CFGBAL,
RES_TO_U32_LOW(port->cfg_space.start));
/* XXX FIXME: Use size from reg property. For now, map 512M */
dcr_write(port->dcrs, DCRO_PEGPL_CFGMSK, 0xe0000001);
/* We map UTL registers based on the reg property */
dcr_write(port->dcrs, DCRO_PEGPL_REGBAH,
RES_TO_U32_HIGH(port->utl_regs.start));
dcr_write(port->dcrs, DCRO_PEGPL_REGBAL,
RES_TO_U32_LOW(port->utl_regs.start));
/* XXX FIXME: Use size from reg property */
dcr_write(port->dcrs, DCRO_PEGPL_REGMSK, 0x00007001);
/* Disable all other outbound windows */
dcr_write(port->dcrs, DCRO_PEGPL_OMR1MSKL, 0);
dcr_write(port->dcrs, DCRO_PEGPL_OMR2MSKL, 0);
dcr_write(port->dcrs, DCRO_PEGPL_OMR3MSKL, 0);
dcr_write(port->dcrs, DCRO_PEGPL_MSGMSK, 0);
}
static int __init ppc4xx_pciex_wait_on_sdr(struct ppc4xx_pciex_port *port,
unsigned int sdr_offset,
unsigned int mask,
unsigned int value,
int timeout_ms)
{
u32 val;
while(timeout_ms--) {
val = mfdcri(SDR0, port->sdr_base + sdr_offset);
if ((val & mask) == value) {
pr_debug("PCIE%d: Wait on SDR %x success with tm %d (%08x)\n",
port->index, sdr_offset, timeout_ms, val);
return 0;
}
msleep(1);
}
return -1;
}
static int __init ppc4xx_pciex_port_init(struct ppc4xx_pciex_port *port)
{
int rc = 0;
/* Init HW */
if (ppc4xx_pciex_hwops->port_init_hw)
rc = ppc4xx_pciex_hwops->port_init_hw(port);
if (rc != 0)
return rc;
printk(KERN_INFO "PCIE%d: Checking link...\n",
port->index);
/* Wait for reset to complete */
if (ppc4xx_pciex_wait_on_sdr(port, PESDRn_RCSSTS, 1 << 20, 0, 10)) {
printk(KERN_WARNING "PCIE%d: PGRST failed\n",
port->index);
return -1;
}
/* Check for card presence detect if supported, if not, just wait for
* link unconditionally.
*
* note that we don't fail if there is no link, we just filter out
* config space accesses. That way, it will be easier to implement
* hotplug later on.
*/
if (!port->has_ibpre ||
!ppc4xx_pciex_wait_on_sdr(port, PESDRn_LOOP,
1 << 28, 1 << 28, 100)) {
printk(KERN_INFO
"PCIE%d: Device detected, waiting for link...\n",
port->index);
if (ppc4xx_pciex_wait_on_sdr(port, PESDRn_LOOP,
0x1000, 0x1000, 2000))
printk(KERN_WARNING
"PCIE%d: Link up failed\n", port->index);
else {
printk(KERN_INFO
"PCIE%d: link is up !\n", port->index);
port->link = 1;
}
} else
printk(KERN_INFO "PCIE%d: No device detected.\n", port->index);
/*
* Initialize mapping: disable all regions and configure
* CFG and REG regions based on resources in the device tree
*/
ppc4xx_pciex_port_init_mapping(port);
/*
* Map UTL
*/
port->utl_base = ioremap(port->utl_regs.start, 0x100);
BUG_ON(port->utl_base == NULL);
/*
* Setup UTL registers --BenH.
*/
if (ppc4xx_pciex_hwops->setup_utl)
ppc4xx_pciex_hwops->setup_utl(port);
/*
* Check for VC0 active and assert RDY.
*/
if (port->link &&
ppc4xx_pciex_wait_on_sdr(port, PESDRn_RCSSTS,
1 << 16, 1 << 16, 5000)) {
printk(KERN_INFO "PCIE%d: VC0 not active\n", port->index);
port->link = 0;
}
dcri_clrset(SDR0, port->sdr_base + PESDRn_RCSSET, 0, 1 << 20);
msleep(100);
return 0;
}
static int ppc4xx_pciex_validate_bdf(struct ppc4xx_pciex_port *port,
struct pci_bus *bus,
unsigned int devfn)
{
static int message;
/* Endpoint can not generate upstream(remote) config cycles */
if (port->endpoint && bus->number != port->hose->first_busno)
return PCIBIOS_DEVICE_NOT_FOUND;
/* Check we are within the mapped range */
if (bus->number > port->hose->last_busno) {
if (!message) {
printk(KERN_WARNING "Warning! Probing bus %u"
" out of range !\n", bus->number);
message++;
}
return PCIBIOS_DEVICE_NOT_FOUND;
}
/* The root complex has only one device / function */
if (bus->number == port->hose->first_busno && devfn != 0)
return PCIBIOS_DEVICE_NOT_FOUND;
/* The other side of the RC has only one device as well */
if (bus->number == (port->hose->first_busno + 1) &&
PCI_SLOT(devfn) != 0)
return PCIBIOS_DEVICE_NOT_FOUND;
/* Check if we have a link */
if ((bus->number != port->hose->first_busno) && !port->link)
return PCIBIOS_DEVICE_NOT_FOUND;
return 0;
}
static void __iomem *ppc4xx_pciex_get_config_base(struct ppc4xx_pciex_port *port,
struct pci_bus *bus,
unsigned int devfn)
{
int relbus;
/* Remove the casts when we finally remove the stupid volatile
* in struct pci_controller
*/
if (bus->number == port->hose->first_busno)
return (void __iomem *)port->hose->cfg_addr;
relbus = bus->number - (port->hose->first_busno + 1);
return (void __iomem *)port->hose->cfg_data +
((relbus << 20) | (devfn << 12));
}
static int ppc4xx_pciex_read_config(struct pci_bus *bus, unsigned int devfn,
int offset, int len, u32 *val)
{
struct pci_controller *hose = (struct pci_controller *) bus->sysdata;
struct ppc4xx_pciex_port *port =
&ppc4xx_pciex_ports[hose->indirect_type];
void __iomem *addr;
u32 gpl_cfg;
BUG_ON(hose != port->hose);
if (ppc4xx_pciex_validate_bdf(port, bus, devfn) != 0)
return PCIBIOS_DEVICE_NOT_FOUND;
addr = ppc4xx_pciex_get_config_base(port, bus, devfn);
/*
* Reading from configuration space of non-existing device can
* generate transaction errors. For the read duration we suppress
* assertion of machine check exceptions to avoid those.
*/
gpl_cfg = dcr_read(port->dcrs, DCRO_PEGPL_CFG);
dcr_write(port->dcrs, DCRO_PEGPL_CFG, gpl_cfg | GPL_DMER_MASK_DISA);
/* Make sure no CRS is recorded */
out_be32(port->utl_base + PEUTL_RCSTA, 0x00040000);
switch (len) {
case 1:
*val = in_8((u8 *)(addr + offset));
break;
case 2:
*val = in_le16((u16 *)(addr + offset));
break;
default:
*val = in_le32((u32 *)(addr + offset));
break;
}
pr_debug("pcie-config-read: bus=%3d [%3d..%3d] devfn=0x%04x"
" offset=0x%04x len=%d, addr=0x%p val=0x%08x\n",
bus->number, hose->first_busno, hose->last_busno,
devfn, offset, len, addr + offset, *val);
/* Check for CRS (440SPe rev B does that for us but heh ..) */
if (in_be32(port->utl_base + PEUTL_RCSTA) & 0x00040000) {
pr_debug("Got CRS !\n");
if (len != 4 || offset != 0)
return PCIBIOS_DEVICE_NOT_FOUND;
*val = 0xffff0001;
}
dcr_write(port->dcrs, DCRO_PEGPL_CFG, gpl_cfg);
return PCIBIOS_SUCCESSFUL;
}
static int ppc4xx_pciex_write_config(struct pci_bus *bus, unsigned int devfn,
int offset, int len, u32 val)
{
struct pci_controller *hose = (struct pci_controller *) bus->sysdata;
struct ppc4xx_pciex_port *port =
&ppc4xx_pciex_ports[hose->indirect_type];
void __iomem *addr;
u32 gpl_cfg;
if (ppc4xx_pciex_validate_bdf(port, bus, devfn) != 0)
return PCIBIOS_DEVICE_NOT_FOUND;
addr = ppc4xx_pciex_get_config_base(port, bus, devfn);
/*
* Reading from configuration space of non-existing device can
* generate transaction errors. For the read duration we suppress
* assertion of machine check exceptions to avoid those.
*/
gpl_cfg = dcr_read(port->dcrs, DCRO_PEGPL_CFG);
dcr_write(port->dcrs, DCRO_PEGPL_CFG, gpl_cfg | GPL_DMER_MASK_DISA);
pr_debug("pcie-config-write: bus=%3d [%3d..%3d] devfn=0x%04x"
" offset=0x%04x len=%d, addr=0x%p val=0x%08x\n",
bus->number, hose->first_busno, hose->last_busno,
devfn, offset, len, addr + offset, val);
switch (len) {
case 1:
out_8((u8 *)(addr + offset), val);
break;
case 2:
out_le16((u16 *)(addr + offset), val);
break;
default:
out_le32((u32 *)(addr + offset), val);
break;
}
dcr_write(port->dcrs, DCRO_PEGPL_CFG, gpl_cfg);
return PCIBIOS_SUCCESSFUL;
}
static struct pci_ops ppc4xx_pciex_pci_ops =
{
.read = ppc4xx_pciex_read_config,
.write = ppc4xx_pciex_write_config,
};
static int __init ppc4xx_setup_one_pciex_POM(struct ppc4xx_pciex_port *port,
struct pci_controller *hose,
void __iomem *mbase,
u64 plb_addr,
u64 pci_addr,
u64 size,
unsigned int flags,
int index)
{
u32 lah, lal, pciah, pcial, sa;
if (!is_power_of_2(size) ||
(index < 2 && size < 0x100000) ||
(index == 2 && size < 0x100) ||
(plb_addr & (size - 1)) != 0) {
printk(KERN_WARNING "%s: Resource out of range\n",
hose->dn->full_name);
return -1;
}
/* Calculate register values */
lah = RES_TO_U32_HIGH(plb_addr);
lal = RES_TO_U32_LOW(plb_addr);
pciah = RES_TO_U32_HIGH(pci_addr);
pcial = RES_TO_U32_LOW(pci_addr);
sa = (0xffffffffu << ilog2(size)) | 0x1;
/* Program register values */
switch (index) {
case 0:
out_le32(mbase + PECFG_POM0LAH, pciah);
out_le32(mbase + PECFG_POM0LAL, pcial);
dcr_write(port->dcrs, DCRO_PEGPL_OMR1BAH, lah);
dcr_write(port->dcrs, DCRO_PEGPL_OMR1BAL, lal);
dcr_write(port->dcrs, DCRO_PEGPL_OMR1MSKH, 0x7fffffff);
/* Note that 3 here means enabled | single region */
dcr_write(port->dcrs, DCRO_PEGPL_OMR1MSKL, sa | 3);
break;
case 1:
out_le32(mbase + PECFG_POM1LAH, pciah);
out_le32(mbase + PECFG_POM1LAL, pcial);
dcr_write(port->dcrs, DCRO_PEGPL_OMR2BAH, lah);
dcr_write(port->dcrs, DCRO_PEGPL_OMR2BAL, lal);
dcr_write(port->dcrs, DCRO_PEGPL_OMR2MSKH, 0x7fffffff);
/* Note that 3 here means enabled | single region */
dcr_write(port->dcrs, DCRO_PEGPL_OMR2MSKL, sa | 3);
break;
case 2:
out_le32(mbase + PECFG_POM2LAH, pciah);
out_le32(mbase + PECFG_POM2LAL, pcial);
dcr_write(port->dcrs, DCRO_PEGPL_OMR3BAH, lah);
dcr_write(port->dcrs, DCRO_PEGPL_OMR3BAL, lal);
dcr_write(port->dcrs, DCRO_PEGPL_OMR3MSKH, 0x7fffffff);
/* Note that 3 here means enabled | IO space !!! */
dcr_write(port->dcrs, DCRO_PEGPL_OMR3MSKL, sa | 3);
break;
}
return 0;
}
static void __init ppc4xx_configure_pciex_POMs(struct ppc4xx_pciex_port *port,
struct pci_controller *hose,
void __iomem *mbase)
{
int i, j, found_isa_hole = 0;
/* Setup outbound memory windows */
for (i = j = 0; i < 3; i++) {
struct resource *res = &hose->mem_resources[i];
/* we only care about memory windows */
if (!(res->flags & IORESOURCE_MEM))
continue;
if (j > 1) {
printk(KERN_WARNING "%s: Too many ranges\n",
port->node->full_name);
break;
}
/* Configure the resource */
if (ppc4xx_setup_one_pciex_POM(port, hose, mbase,
res->start,
res->start - hose->pci_mem_offset,
res->end + 1 - res->start,
res->flags,
j) == 0) {
j++;
/* If the resource PCI address is 0 then we have our
* ISA memory hole
*/
if (res->start == hose->pci_mem_offset)
found_isa_hole = 1;
}
}
/* Handle ISA memory hole if not already covered */
if (j <= 1 && !found_isa_hole && hose->isa_mem_size)
if (ppc4xx_setup_one_pciex_POM(port, hose, mbase,
hose->isa_mem_phys, 0,
hose->isa_mem_size, 0, j) == 0)
printk(KERN_INFO "%s: Legacy ISA memory support enabled\n",
hose->dn->full_name);
/* Configure IO, always 64K starting at 0. We hard wire it to 64K !
* Note also that it -has- to be region index 2 on this HW
*/
if (hose->io_resource.flags & IORESOURCE_IO)
ppc4xx_setup_one_pciex_POM(port, hose, mbase,
hose->io_base_phys, 0,
0x10000, IORESOURCE_IO, 2);
}
static void __init ppc4xx_configure_pciex_PIMs(struct ppc4xx_pciex_port *port,
struct pci_controller *hose,
void __iomem *mbase,
struct resource *res)
{
resource_size_t size = res->end - res->start + 1;
u64 sa;
if (port->endpoint) {
resource_size_t ep_addr = 0;
resource_size_t ep_size = 32 << 20;
/* Currently we map a fixed 64MByte window to PLB address
* 0 (SDRAM). This should probably be configurable via a dts
* property.
*/
/* Calculate window size */
sa = (0xffffffffffffffffull << ilog2(ep_size));;
/* Setup BAR0 */
out_le32(mbase + PECFG_BAR0HMPA, RES_TO_U32_HIGH(sa));
out_le32(mbase + PECFG_BAR0LMPA, RES_TO_U32_LOW(sa) |
PCI_BASE_ADDRESS_MEM_TYPE_64);
/* Disable BAR1 & BAR2 */
out_le32(mbase + PECFG_BAR1MPA, 0);
out_le32(mbase + PECFG_BAR2HMPA, 0);
out_le32(mbase + PECFG_BAR2LMPA, 0);
out_le32(mbase + PECFG_PIM01SAH, RES_TO_U32_HIGH(sa));
out_le32(mbase + PECFG_PIM01SAL, RES_TO_U32_LOW(sa));
out_le32(mbase + PCI_BASE_ADDRESS_0, RES_TO_U32_LOW(ep_addr));
out_le32(mbase + PCI_BASE_ADDRESS_1, RES_TO_U32_HIGH(ep_addr));
} else {
/* Calculate window size */
sa = (0xffffffffffffffffull << ilog2(size));;
if (res->flags & IORESOURCE_PREFETCH)
sa |= 0x8;
out_le32(mbase + PECFG_BAR0HMPA, RES_TO_U32_HIGH(sa));
out_le32(mbase + PECFG_BAR0LMPA, RES_TO_U32_LOW(sa));
/* The setup of the split looks weird to me ... let's see
* if it works
*/
out_le32(mbase + PECFG_PIM0LAL, 0x00000000);
out_le32(mbase + PECFG_PIM0LAH, 0x00000000);
out_le32(mbase + PECFG_PIM1LAL, 0x00000000);
out_le32(mbase + PECFG_PIM1LAH, 0x00000000);
out_le32(mbase + PECFG_PIM01SAH, 0xffff0000);
out_le32(mbase + PECFG_PIM01SAL, 0x00000000);
out_le32(mbase + PCI_BASE_ADDRESS_0, RES_TO_U32_LOW(res->start));
out_le32(mbase + PCI_BASE_ADDRESS_1, RES_TO_U32_HIGH(res->start));
}
/* Enable inbound mapping */
out_le32(mbase + PECFG_PIMEN, 0x1);
/* Enable I/O, Mem, and Busmaster cycles */
out_le16(mbase + PCI_COMMAND,
in_le16(mbase + PCI_COMMAND) |
PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
}
static void __init ppc4xx_pciex_port_setup_hose(struct ppc4xx_pciex_port *port)
{
struct resource dma_window;
struct pci_controller *hose = NULL;
const int *bus_range;
int primary = 0, busses;
void __iomem *mbase = NULL, *cfg_data = NULL;
const u32 *pval;
u32 val;
/* Check if primary bridge */
if (of_get_property(port->node, "primary", NULL))
primary = 1;
/* Get bus range if any */
bus_range = of_get_property(port->node, "bus-range", NULL);
/* Allocate the host controller data structure */
hose = pcibios_alloc_controller(port->node);
if (!hose)
goto fail;
/* We stick the port number in "indirect_type" so the config space
* ops can retrieve the port data structure easily
*/
hose->indirect_type = port->index;
/* Get bus range */
hose->first_busno = bus_range ? bus_range[0] : 0x0;
hose->last_busno = bus_range ? bus_range[1] : 0xff;
/* Because of how big mapping the config space is (1M per bus), we
* limit how many busses we support. In the long run, we could replace
* that with something akin to kmap_atomic instead. We set aside 1 bus
* for the host itself too.
*/
busses = hose->last_busno - hose->first_busno; /* This is off by 1 */
if (busses > MAX_PCIE_BUS_MAPPED) {
busses = MAX_PCIE_BUS_MAPPED;
hose->last_busno = hose->first_busno + busses;
}
if (!port->endpoint) {
/* Only map the external config space in cfg_data for
* PCIe root-complexes. External space is 1M per bus
*/
cfg_data = ioremap(port->cfg_space.start +
(hose->first_busno + 1) * 0x100000,
busses * 0x100000);
if (cfg_data == NULL) {
printk(KERN_ERR "%s: Can't map external config space !",
port->node->full_name);
goto fail;
}
hose->cfg_data = cfg_data;
}
/* Always map the host config space in cfg_addr.
* Internal space is 4K
*/
mbase = ioremap(port->cfg_space.start + 0x10000000, 0x1000);
if (mbase == NULL) {
printk(KERN_ERR "%s: Can't map internal config space !",
port->node->full_name);
goto fail;
}
hose->cfg_addr = mbase;
pr_debug("PCIE %s, bus %d..%d\n", port->node->full_name,
hose->first_busno, hose->last_busno);
pr_debug(" config space mapped at: root @0x%p, other @0x%p\n",
hose->cfg_addr, hose->cfg_data);
/* Setup config space */
hose->ops = &ppc4xx_pciex_pci_ops;
port->hose = hose;
mbase = (void __iomem *)hose->cfg_addr;
if (!port->endpoint) {
/*
* Set bus numbers on our root port
*/
out_8(mbase + PCI_PRIMARY_BUS, hose->first_busno);
out_8(mbase + PCI_SECONDARY_BUS, hose->first_busno + 1);
out_8(mbase + PCI_SUBORDINATE_BUS, hose->last_busno);
}
/*
* OMRs are already reset, also disable PIMs
*/
out_le32(mbase + PECFG_PIMEN, 0);
/* Parse outbound mapping resources */
pci_process_bridge_OF_ranges(hose, port->node, primary);
/* Parse inbound mapping resources */
if (ppc4xx_parse_dma_ranges(hose, mbase, &dma_window) != 0)
goto fail;
/* Configure outbound ranges POMs */
ppc4xx_configure_pciex_POMs(port, hose, mbase);
/* Configure inbound ranges PIMs */
ppc4xx_configure_pciex_PIMs(port, hose, mbase, &dma_window);
/* The root complex doesn't show up if we don't set some vendor
* and device IDs into it. The defaults below are the same bogus
* one that the initial code in arch/ppc had. This can be
* overwritten by setting the "vendor-id/device-id" properties
* in the pciex node.
*/
/* Get the (optional) vendor-/device-id from the device-tree */
pval = of_get_property(port->node, "vendor-id", NULL);
if (pval) {
val = *pval;
} else {
if (!port->endpoint)
val = 0xaaa0 + port->index;
else
val = 0xeee0 + port->index;
}
out_le16(mbase + 0x200, val);
pval = of_get_property(port->node, "device-id", NULL);
if (pval) {
val = *pval;
} else {
if (!port->endpoint)
val = 0xbed0 + port->index;
else
val = 0xfed0 + port->index;
}
out_le16(mbase + 0x202, val);
if (!port->endpoint) {
/* Set Class Code to PCI-PCI bridge and Revision Id to 1 */
out_le32(mbase + 0x208, 0x06040001);
printk(KERN_INFO "PCIE%d: successfully set as root-complex\n",
port->index);
} else {
/* Set Class Code to Processor/PPC */
out_le32(mbase + 0x208, 0x0b200001);
printk(KERN_INFO "PCIE%d: successfully set as endpoint\n",
port->index);
}
return;
fail:
if (hose)
pcibios_free_controller(hose);
if (cfg_data)
iounmap(cfg_data);
if (mbase)
iounmap(mbase);
}
static void __init ppc4xx_probe_pciex_bridge(struct device_node *np)
{
struct ppc4xx_pciex_port *port;
const u32 *pval;
int portno;
unsigned int dcrs;
const char *val;
/* First, proceed to core initialization as we assume there's
* only one PCIe core in the system
*/
if (ppc4xx_pciex_check_core_init(np))
return;
/* Get the port number from the device-tree */
pval = of_get_property(np, "port", NULL);
if (pval == NULL) {
printk(KERN_ERR "PCIE: Can't find port number for %s\n",
np->full_name);
return;
}
portno = *pval;
if (portno >= ppc4xx_pciex_port_count) {
printk(KERN_ERR "PCIE: port number out of range for %s\n",
np->full_name);
return;
}
port = &ppc4xx_pciex_ports[portno];
port->index = portno;
/*
* Check if device is enabled
*/
if (!of_device_is_available(np)) {
printk(KERN_INFO "PCIE%d: Port disabled via device-tree\n", port->index);
return;
}
port->node = of_node_get(np);
pval = of_get_property(np, "sdr-base", NULL);
if (pval == NULL) {
printk(KERN_ERR "PCIE: missing sdr-base for %s\n",
np->full_name);
return;
}
port->sdr_base = *pval;
/* Check if device_type property is set to "pci" or "pci-endpoint".
* Resulting from this setup this PCIe port will be configured
* as root-complex or as endpoint.
*/
val = of_get_property(port->node, "device_type", NULL);
if (!strcmp(val, "pci-endpoint")) {
port->endpoint = 1;
} else if (!strcmp(val, "pci")) {
port->endpoint = 0;
} else {
printk(KERN_ERR "PCIE: missing or incorrect device_type for %s\n",
np->full_name);
return;
}
/* Fetch config space registers address */
if (of_address_to_resource(np, 0, &port->cfg_space)) {
printk(KERN_ERR "%s: Can't get PCI-E config space !",
np->full_name);
return;
}
/* Fetch host bridge internal registers address */
if (of_address_to_resource(np, 1, &port->utl_regs)) {
printk(KERN_ERR "%s: Can't get UTL register base !",
np->full_name);
return;
}
/* Map DCRs */
dcrs = dcr_resource_start(np, 0);
if (dcrs == 0) {
printk(KERN_ERR "%s: Can't get DCR register base !",
np->full_name);
return;
}
port->dcrs = dcr_map(np, dcrs, dcr_resource_len(np, 0));
/* Initialize the port specific registers */
if (ppc4xx_pciex_port_init(port)) {
printk(KERN_WARNING "PCIE%d: Port init failed\n", port->index);
return;
}
/* Setup the linux hose data structure */
ppc4xx_pciex_port_setup_hose(port);
}
#endif /* CONFIG_PPC4xx_PCI_EXPRESS */
static int __init ppc4xx_pci_find_bridges(void)
{
struct device_node *np;
#ifdef CONFIG_PPC4xx_PCI_EXPRESS
for_each_compatible_node(np, NULL, "ibm,plb-pciex")
ppc4xx_probe_pciex_bridge(np);
#endif
for_each_compatible_node(np, NULL, "ibm,plb-pcix")
ppc4xx_probe_pcix_bridge(np);
for_each_compatible_node(np, NULL, "ibm,plb-pci")
ppc4xx_probe_pci_bridge(np);
return 0;
}
arch_initcall(ppc4xx_pci_find_bridges);
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