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linuxdebug/arch/powerpc/sysdev/fsl_pci.c

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null pointer error
2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* MPC83xx/85xx/86xx PCI/PCIE support routing.
*
* Copyright 2007-2012 Freescale Semiconductor, Inc.
* Copyright 2008-2009 MontaVista Software, Inc.
*
* Initial author: Xianghua Xiao <x.xiao@freescale.com>
* Recode: ZHANG WEI <wei.zhang@freescale.com>
* Rewrite the routing for Frescale PCI and PCI Express
* Roy Zang <tie-fei.zang@freescale.com>
* MPC83xx PCI-Express support:
* Tony Li <tony.li@freescale.com>
* Anton Vorontsov <avorontsov@ru.mvista.com>
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/fsl/edac.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/memblock.h>
#include <linux/log2.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/suspend.h>
#include <linux/syscore_ops.h>
#include <linux/uaccess.h>
#include <asm/io.h>
#include <asm/pci-bridge.h>
#include <asm/ppc-pci.h>
#include <asm/machdep.h>
#include <asm/mpc85xx.h>
#include <asm/disassemble.h>
#include <asm/ppc-opcode.h>
#include <asm/swiotlb.h>
#include <asm/setup.h>
#include <sysdev/fsl_soc.h>
#include <sysdev/fsl_pci.h>
static int fsl_pcie_bus_fixup, is_mpc83xx_pci;
static void quirk_fsl_pcie_early(struct pci_dev *dev)
{
u8 hdr_type;
/* if we aren't a PCIe don't bother */
if (!pci_is_pcie(dev))
return;
/* if we aren't in host mode don't bother */
pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type);
if ((hdr_type & 0x7f) != PCI_HEADER_TYPE_BRIDGE)
return;
dev->class = PCI_CLASS_BRIDGE_PCI_NORMAL;
fsl_pcie_bus_fixup = 1;
return;
}
static int fsl_indirect_read_config(struct pci_bus *, unsigned int,
int, int, u32 *);
static int fsl_pcie_check_link(struct pci_controller *hose)
{
u32 val = 0;
if (hose->indirect_type & PPC_INDIRECT_TYPE_FSL_CFG_REG_LINK) {
if (hose->ops->read == fsl_indirect_read_config)
__indirect_read_config(hose, hose->first_busno, 0,
PCIE_LTSSM, 4, &val);
else
early_read_config_dword(hose, 0, 0, PCIE_LTSSM, &val);
if (val < PCIE_LTSSM_L0)
return 1;
} else {
struct ccsr_pci __iomem *pci = hose->private_data;
/* for PCIe IP rev 3.0 or greater use CSR0 for link state */
val = (in_be32(&pci->pex_csr0) & PEX_CSR0_LTSSM_MASK)
>> PEX_CSR0_LTSSM_SHIFT;
if (val != PEX_CSR0_LTSSM_L0)
return 1;
}
return 0;
}
static int fsl_indirect_read_config(struct pci_bus *bus, unsigned int devfn,
int offset, int len, u32 *val)
{
struct pci_controller *hose = pci_bus_to_host(bus);
if (fsl_pcie_check_link(hose))
hose->indirect_type |= PPC_INDIRECT_TYPE_NO_PCIE_LINK;
else
hose->indirect_type &= ~PPC_INDIRECT_TYPE_NO_PCIE_LINK;
return indirect_read_config(bus, devfn, offset, len, val);
}
#if defined(CONFIG_FSL_SOC_BOOKE) || defined(CONFIG_PPC_86xx)
static struct pci_ops fsl_indirect_pcie_ops =
{
.read = fsl_indirect_read_config,
.write = indirect_write_config,
};
static u64 pci64_dma_offset;
#ifdef CONFIG_SWIOTLB
static void pci_dma_dev_setup_swiotlb(struct pci_dev *pdev)
{
struct pci_controller *hose = pci_bus_to_host(pdev->bus);
pdev->dev.bus_dma_limit =
hose->dma_window_base_cur + hose->dma_window_size - 1;
}
static void setup_swiotlb_ops(struct pci_controller *hose)
{
if (ppc_swiotlb_enable)
hose->controller_ops.dma_dev_setup = pci_dma_dev_setup_swiotlb;
}
#else
static inline void setup_swiotlb_ops(struct pci_controller *hose) {}
#endif
static void fsl_pci_dma_set_mask(struct device *dev, u64 dma_mask)
{
/*
* Fix up PCI devices that are able to DMA to the large inbound
* mapping that allows addressing any RAM address from across PCI.
*/
if (dev_is_pci(dev) && dma_mask >= pci64_dma_offset * 2 - 1) {
dev->bus_dma_limit = 0;
dev->archdata.dma_offset = pci64_dma_offset;
}
}
static int setup_one_atmu(struct ccsr_pci __iomem *pci,
unsigned int index, const struct resource *res,
resource_size_t offset)
{
resource_size_t pci_addr = res->start - offset;
resource_size_t phys_addr = res->start;
resource_size_t size = resource_size(res);
u32 flags = 0x80044000; /* enable & mem R/W */
unsigned int i;
pr_debug("PCI MEM resource start 0x%016llx, size 0x%016llx.\n",
(u64)res->start, (u64)size);
if (res->flags & IORESOURCE_PREFETCH)
flags |= 0x10000000; /* enable relaxed ordering */
for (i = 0; size > 0; i++) {
unsigned int bits = min_t(u32, ilog2(size),
__ffs(pci_addr | phys_addr));
if (index + i >= 5)
return -1;
out_be32(&pci->pow[index + i].potar, pci_addr >> 12);
out_be32(&pci->pow[index + i].potear, (u64)pci_addr >> 44);
out_be32(&pci->pow[index + i].powbar, phys_addr >> 12);
out_be32(&pci->pow[index + i].powar, flags | (bits - 1));
pci_addr += (resource_size_t)1U << bits;
phys_addr += (resource_size_t)1U << bits;
size -= (resource_size_t)1U << bits;
}
return i;
}
static bool is_kdump(void)
{
struct device_node *node;
bool ret;
node = of_find_node_by_type(NULL, "memory");
if (!node) {
WARN_ON_ONCE(1);
return false;
}
ret = of_property_read_bool(node, "linux,usable-memory");
of_node_put(node);
return ret;
}
/* atmu setup for fsl pci/pcie controller */
static void setup_pci_atmu(struct pci_controller *hose)
{
struct ccsr_pci __iomem *pci = hose->private_data;
int i, j, n, mem_log, win_idx = 3, start_idx = 1, end_idx = 4;
u64 mem, sz, paddr_hi = 0;
u64 offset = 0, paddr_lo = ULLONG_MAX;
u32 pcicsrbar = 0, pcicsrbar_sz;
u32 piwar = PIWAR_EN | PIWAR_PF | PIWAR_TGI_LOCAL |
PIWAR_READ_SNOOP | PIWAR_WRITE_SNOOP;
const u64 *reg;
int len;
bool setup_inbound;
/*
* If this is kdump, we don't want to trigger a bunch of PCI
* errors by closing the window on in-flight DMA.
*
* We still run most of the function's logic so that things like
* hose->dma_window_size still get set.
*/
setup_inbound = !is_kdump();
if (of_device_is_compatible(hose->dn, "fsl,bsc9132-pcie")) {
/*
* BSC9132 Rev1.0 has an issue where all the PEX inbound
* windows have implemented the default target value as 0xf
* for CCSR space.In all Freescale legacy devices the target
* of 0xf is reserved for local memory space. 9132 Rev1.0
* now has local memory space mapped to target 0x0 instead of
* 0xf. Hence adding a workaround to remove the target 0xf
* defined for memory space from Inbound window attributes.
*/
piwar &= ~PIWAR_TGI_LOCAL;
}
if (early_find_capability(hose, 0, 0, PCI_CAP_ID_EXP)) {
if (in_be32(&pci->block_rev1) >= PCIE_IP_REV_2_2) {
win_idx = 2;
start_idx = 0;
end_idx = 3;
}
}
/* Disable all windows (except powar0 since it's ignored) */
for(i = 1; i < 5; i++)
out_be32(&pci->pow[i].powar, 0);
if (setup_inbound) {
for (i = start_idx; i < end_idx; i++)
out_be32(&pci->piw[i].piwar, 0);
}
/* Setup outbound MEM window */
for(i = 0, j = 1; i < 3; i++) {
if (!(hose->mem_resources[i].flags & IORESOURCE_MEM))
continue;
paddr_lo = min(paddr_lo, (u64)hose->mem_resources[i].start);
paddr_hi = max(paddr_hi, (u64)hose->mem_resources[i].end);
/* We assume all memory resources have the same offset */
offset = hose->mem_offset[i];
n = setup_one_atmu(pci, j, &hose->mem_resources[i], offset);
if (n < 0 || j >= 5) {
pr_err("Ran out of outbound PCI ATMUs for resource %d!\n", i);
hose->mem_resources[i].flags |= IORESOURCE_DISABLED;
} else
j += n;
}
/* Setup outbound IO window */
if (hose->io_resource.flags & IORESOURCE_IO) {
if (j >= 5) {
pr_err("Ran out of outbound PCI ATMUs for IO resource\n");
} else {
pr_debug("PCI IO resource start 0x%016llx, size 0x%016llx, "
"phy base 0x%016llx.\n",
(u64)hose->io_resource.start,
(u64)resource_size(&hose->io_resource),
(u64)hose->io_base_phys);
out_be32(&pci->pow[j].potar, (hose->io_resource.start >> 12));
out_be32(&pci->pow[j].potear, 0);
out_be32(&pci->pow[j].powbar, (hose->io_base_phys >> 12));
/* Enable, IO R/W */
out_be32(&pci->pow[j].powar, 0x80088000
| (ilog2(hose->io_resource.end
- hose->io_resource.start + 1) - 1));
}
}
/* convert to pci address space */
paddr_hi -= offset;
paddr_lo -= offset;
if (paddr_hi == paddr_lo) {
pr_err("%pOF: No outbound window space\n", hose->dn);
return;
}
if (paddr_lo == 0) {
pr_err("%pOF: No space for inbound window\n", hose->dn);
return;
}
/* setup PCSRBAR/PEXCSRBAR */
early_write_config_dword(hose, 0, 0, PCI_BASE_ADDRESS_0, 0xffffffff);
early_read_config_dword(hose, 0, 0, PCI_BASE_ADDRESS_0, &pcicsrbar_sz);
pcicsrbar_sz = ~pcicsrbar_sz + 1;
if (paddr_hi < (0x100000000ull - pcicsrbar_sz) ||
(paddr_lo > 0x100000000ull))
pcicsrbar = 0x100000000ull - pcicsrbar_sz;
else
pcicsrbar = (paddr_lo - pcicsrbar_sz) & -pcicsrbar_sz;
early_write_config_dword(hose, 0, 0, PCI_BASE_ADDRESS_0, pcicsrbar);
paddr_lo = min(paddr_lo, (u64)pcicsrbar);
pr_info("%pOF: PCICSRBAR @ 0x%x\n", hose->dn, pcicsrbar);
/* Setup inbound mem window */
mem = memblock_end_of_DRAM();
pr_info("%s: end of DRAM %llx\n", __func__, mem);
/*
* The msi-address-64 property, if it exists, indicates the physical
* address of the MSIIR register. Normally, this register is located
* inside CCSR, so the ATMU that covers all of CCSR is used. But if
* this property exists, then we normally need to create a new ATMU
* for it. For now, however, we cheat. The only entity that creates
* this property is the Freescale hypervisor, and the address is
* specified in the partition configuration. Typically, the address
* is located in the page immediately after the end of DDR. If so, we
* can avoid allocating a new ATMU by extending the DDR ATMU by one
* page.
*/
reg = of_get_property(hose->dn, "msi-address-64", &len);
if (reg && (len == sizeof(u64))) {
u64 address = be64_to_cpup(reg);
if ((address >= mem) && (address < (mem + PAGE_SIZE))) {
pr_info("%pOF: extending DDR ATMU to cover MSIIR", hose->dn);
mem += PAGE_SIZE;
} else {
/* TODO: Create a new ATMU for MSIIR */
pr_warn("%pOF: msi-address-64 address of %llx is "
"unsupported\n", hose->dn, address);
}
}
sz = min(mem, paddr_lo);
mem_log = ilog2(sz);
/* PCIe can overmap inbound & outbound since RX & TX are separated */
if (early_find_capability(hose, 0, 0, PCI_CAP_ID_EXP)) {
/* Size window to exact size if power-of-two or one size up */
if ((1ull << mem_log) != mem) {
mem_log++;
if ((1ull << mem_log) > mem)
pr_info("%pOF: Setting PCI inbound window "
"greater than memory size\n", hose->dn);
}
piwar |= ((mem_log - 1) & PIWAR_SZ_MASK);
if (setup_inbound) {
/* Setup inbound memory window */
out_be32(&pci->piw[win_idx].pitar, 0x00000000);
out_be32(&pci->piw[win_idx].piwbar, 0x00000000);
out_be32(&pci->piw[win_idx].piwar, piwar);
}
win_idx--;
hose->dma_window_base_cur = 0x00000000;
hose->dma_window_size = (resource_size_t)sz;
/*
* if we have >4G of memory setup second PCI inbound window to
* let devices that are 64-bit address capable to work w/o
* SWIOTLB and access the full range of memory
*/
if (sz != mem) {
mem_log = ilog2(mem);
/* Size window up if we dont fit in exact power-of-2 */
if ((1ull << mem_log) != mem)
mem_log++;
piwar = (piwar & ~PIWAR_SZ_MASK) | (mem_log - 1);
pci64_dma_offset = 1ULL << mem_log;
if (setup_inbound) {
/* Setup inbound memory window */
out_be32(&pci->piw[win_idx].pitar, 0x00000000);
out_be32(&pci->piw[win_idx].piwbear,
pci64_dma_offset >> 44);
out_be32(&pci->piw[win_idx].piwbar,
pci64_dma_offset >> 12);
out_be32(&pci->piw[win_idx].piwar, piwar);
}
/*
* install our own dma_set_mask handler to fixup dma_ops
* and dma_offset
*/
ppc_md.dma_set_mask = fsl_pci_dma_set_mask;
pr_info("%pOF: Setup 64-bit PCI DMA window\n", hose->dn);
}
} else {
u64 paddr = 0;
if (setup_inbound) {
/* Setup inbound memory window */
out_be32(&pci->piw[win_idx].pitar, paddr >> 12);
out_be32(&pci->piw[win_idx].piwbar, paddr >> 12);
out_be32(&pci->piw[win_idx].piwar,
(piwar | (mem_log - 1)));
}
win_idx--;
paddr += 1ull << mem_log;
sz -= 1ull << mem_log;
if (sz) {
mem_log = ilog2(sz);
piwar |= (mem_log - 1);
if (setup_inbound) {
out_be32(&pci->piw[win_idx].pitar,
paddr >> 12);
out_be32(&pci->piw[win_idx].piwbar,
paddr >> 12);
out_be32(&pci->piw[win_idx].piwar, piwar);
}
win_idx--;
paddr += 1ull << mem_log;
}
hose->dma_window_base_cur = 0x00000000;
hose->dma_window_size = (resource_size_t)paddr;
}
if (hose->dma_window_size < mem) {
#ifdef CONFIG_SWIOTLB
ppc_swiotlb_enable = 1;
#else
pr_err("%pOF: ERROR: Memory size exceeds PCI ATMU ability to "
"map - enable CONFIG_SWIOTLB to avoid dma errors.\n",
hose->dn);
#endif
/* adjusting outbound windows could reclaim space in mem map */
if (paddr_hi < 0xffffffffull)
pr_warn("%pOF: WARNING: Outbound window cfg leaves "
"gaps in memory map. Adjusting the memory map "
"could reduce unnecessary bounce buffering.\n",
hose->dn);
pr_info("%pOF: DMA window size is 0x%llx\n", hose->dn,
(u64)hose->dma_window_size);
}
}
static void setup_pci_cmd(struct pci_controller *hose)
{
u16 cmd;
int cap_x;
early_read_config_word(hose, 0, 0, PCI_COMMAND, &cmd);
cmd |= PCI_COMMAND_SERR | PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY
| PCI_COMMAND_IO;
early_write_config_word(hose, 0, 0, PCI_COMMAND, cmd);
cap_x = early_find_capability(hose, 0, 0, PCI_CAP_ID_PCIX);
if (cap_x) {
int pci_x_cmd = cap_x + PCI_X_CMD;
cmd = PCI_X_CMD_MAX_SPLIT | PCI_X_CMD_MAX_READ
| PCI_X_CMD_ERO | PCI_X_CMD_DPERR_E;
early_write_config_word(hose, 0, 0, pci_x_cmd, cmd);
} else {
early_write_config_byte(hose, 0, 0, PCI_LATENCY_TIMER, 0x80);
}
}
void fsl_pcibios_fixup_bus(struct pci_bus *bus)
{
struct pci_controller *hose = pci_bus_to_host(bus);
int i, is_pcie = 0, no_link;
/* The root complex bridge comes up with bogus resources,
* we copy the PHB ones in.
*
* With the current generic PCI code, the PHB bus no longer
* has bus->resource[0..4] set, so things are a bit more
* tricky.
*/
if (fsl_pcie_bus_fixup)
is_pcie = early_find_capability(hose, 0, 0, PCI_CAP_ID_EXP);
no_link = !!(hose->indirect_type & PPC_INDIRECT_TYPE_NO_PCIE_LINK);
if (bus->parent == hose->bus && (is_pcie || no_link)) {
for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; ++i) {
struct resource *res = bus->resource[i];
struct resource *par;
if (!res)
continue;
if (i == 0)
par = &hose->io_resource;
else if (i < 4)
par = &hose->mem_resources[i-1];
else par = NULL;
res->start = par ? par->start : 0;
res->end = par ? par->end : 0;
res->flags = par ? par->flags : 0;
}
}
}
int fsl_add_bridge(struct platform_device *pdev, int is_primary)
{
int len;
struct pci_controller *hose;
struct resource rsrc;
const int *bus_range;
u8 hdr_type, progif;
u32 class_code;
struct device_node *dev;
struct ccsr_pci __iomem *pci;
u16 temp;
u32 svr = mfspr(SPRN_SVR);
dev = pdev->dev.of_node;
if (!of_device_is_available(dev)) {
pr_warn("%pOF: disabled\n", dev);
return -ENODEV;
}
pr_debug("Adding PCI host bridge %pOF\n", dev);
/* Fetch host bridge registers address */
if (of_address_to_resource(dev, 0, &rsrc)) {
printk(KERN_WARNING "Can't get pci register base!");
return -ENOMEM;
}
/* Get bus range if any */
bus_range = of_get_property(dev, "bus-range", &len);
if (bus_range == NULL || len < 2 * sizeof(int))
printk(KERN_WARNING "Can't get bus-range for %pOF, assume"
" bus 0\n", dev);
pci_add_flags(PCI_REASSIGN_ALL_BUS);
hose = pcibios_alloc_controller(dev);
if (!hose)
return -ENOMEM;
/* set platform device as the parent */
hose->parent = &pdev->dev;
hose->first_busno = bus_range ? bus_range[0] : 0x0;
hose->last_busno = bus_range ? bus_range[1] : 0xff;
pr_debug("PCI memory map start 0x%016llx, size 0x%016llx\n",
(u64)rsrc.start, (u64)resource_size(&rsrc));
pci = hose->private_data = ioremap(rsrc.start, resource_size(&rsrc));
if (!hose->private_data)
goto no_bridge;
setup_indirect_pci(hose, rsrc.start, rsrc.start + 0x4,
PPC_INDIRECT_TYPE_BIG_ENDIAN);
if (in_be32(&pci->block_rev1) < PCIE_IP_REV_3_0)
hose->indirect_type |= PPC_INDIRECT_TYPE_FSL_CFG_REG_LINK;
if (early_find_capability(hose, 0, 0, PCI_CAP_ID_EXP)) {
/* use fsl_indirect_read_config for PCIe */
hose->ops = &fsl_indirect_pcie_ops;
/* For PCIE read HEADER_TYPE to identify controller mode */
early_read_config_byte(hose, 0, 0, PCI_HEADER_TYPE, &hdr_type);
if ((hdr_type & 0x7f) != PCI_HEADER_TYPE_BRIDGE)
goto no_bridge;
} else {
/* For PCI read PROG to identify controller mode */
early_read_config_byte(hose, 0, 0, PCI_CLASS_PROG, &progif);
if ((progif & 1) &&
!of_property_read_bool(dev, "fsl,pci-agent-force-enum"))
goto no_bridge;
}
setup_pci_cmd(hose);
/* check PCI express link status */
if (early_find_capability(hose, 0, 0, PCI_CAP_ID_EXP)) {
hose->indirect_type |= PPC_INDIRECT_TYPE_EXT_REG |
PPC_INDIRECT_TYPE_SURPRESS_PRIMARY_BUS;
if (fsl_pcie_check_link(hose))
hose->indirect_type |= PPC_INDIRECT_TYPE_NO_PCIE_LINK;
/* Fix Class Code to PCI_CLASS_BRIDGE_PCI_NORMAL for pre-3.0 controller */
if (in_be32(&pci->block_rev1) < PCIE_IP_REV_3_0) {
early_read_config_dword(hose, 0, 0, PCIE_FSL_CSR_CLASSCODE, &class_code);
class_code &= 0xff;
class_code |= PCI_CLASS_BRIDGE_PCI_NORMAL << 8;
early_write_config_dword(hose, 0, 0, PCIE_FSL_CSR_CLASSCODE, class_code);
}
} else {
/*
* Set PBFR(PCI Bus Function Register)[10] = 1 to
* disable the combining of crossing cacheline
* boundary requests into one burst transaction.
* PCI-X operation is not affected.
* Fix erratum PCI 5 on MPC8548
*/
#define PCI_BUS_FUNCTION 0x44
#define PCI_BUS_FUNCTION_MDS 0x400 /* Master disable streaming */
if (((SVR_SOC_VER(svr) == SVR_8543) ||
(SVR_SOC_VER(svr) == SVR_8545) ||
(SVR_SOC_VER(svr) == SVR_8547) ||
(SVR_SOC_VER(svr) == SVR_8548)) &&
!early_find_capability(hose, 0, 0, PCI_CAP_ID_PCIX)) {
early_read_config_word(hose, 0, 0,
PCI_BUS_FUNCTION, &temp);
temp |= PCI_BUS_FUNCTION_MDS;
early_write_config_word(hose, 0, 0,
PCI_BUS_FUNCTION, temp);
}
}
printk(KERN_INFO "Found FSL PCI host bridge at 0x%016llx. "
"Firmware bus number: %d->%d\n",
(unsigned long long)rsrc.start, hose->first_busno,
hose->last_busno);
pr_debug(" ->Hose at 0x%p, cfg_addr=0x%p,cfg_data=0x%p\n",
hose, hose->cfg_addr, hose->cfg_data);
/* Interpret the "ranges" property */
/* This also maps the I/O region and sets isa_io/mem_base */
pci_process_bridge_OF_ranges(hose, dev, is_primary);
/* Setup PEX window registers */
setup_pci_atmu(hose);
/* Set up controller operations */
setup_swiotlb_ops(hose);
return 0;
no_bridge:
iounmap(hose->private_data);
/* unmap cfg_data & cfg_addr separately if not on same page */
if (((unsigned long)hose->cfg_data & PAGE_MASK) !=
((unsigned long)hose->cfg_addr & PAGE_MASK))
iounmap(hose->cfg_data);
iounmap(hose->cfg_addr);
pcibios_free_controller(hose);
return -ENODEV;
}
#endif /* CONFIG_FSL_SOC_BOOKE || CONFIG_PPC_86xx */
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID,
quirk_fsl_pcie_early);
#if defined(CONFIG_PPC_83xx) || defined(CONFIG_PPC_MPC512x)
struct mpc83xx_pcie_priv {
void __iomem *cfg_type0;
void __iomem *cfg_type1;
u32 dev_base;
};
struct pex_inbound_window {
u32 ar;
u32 tar;
u32 barl;
u32 barh;
};
/*
* With the convention of u-boot, the PCIE outbound window 0 serves
* as configuration transactions outbound.
*/
#define PEX_OUTWIN0_BAR 0xCA4
#define PEX_OUTWIN0_TAL 0xCA8
#define PEX_OUTWIN0_TAH 0xCAC
#define PEX_RC_INWIN_BASE 0xE60
#define PEX_RCIWARn_EN 0x1
static int mpc83xx_pcie_exclude_device(struct pci_bus *bus, unsigned int devfn)
{
struct pci_controller *hose = pci_bus_to_host(bus);
if (hose->indirect_type & PPC_INDIRECT_TYPE_NO_PCIE_LINK)
return PCIBIOS_DEVICE_NOT_FOUND;
/*
* Workaround for the HW bug: for Type 0 configure transactions the
* PCI-E controller does not check the device number bits and just
* assumes that the device number bits are 0.
*/
if (bus->number == hose->first_busno ||
bus->primary == hose->first_busno) {
if (devfn & 0xf8)
return PCIBIOS_DEVICE_NOT_FOUND;
}
if (ppc_md.pci_exclude_device) {
if (ppc_md.pci_exclude_device(hose, bus->number, devfn))
return PCIBIOS_DEVICE_NOT_FOUND;
}
return PCIBIOS_SUCCESSFUL;
}
static void __iomem *mpc83xx_pcie_remap_cfg(struct pci_bus *bus,
unsigned int devfn, int offset)
{
struct pci_controller *hose = pci_bus_to_host(bus);
struct mpc83xx_pcie_priv *pcie = hose->dn->data;
u32 dev_base = bus->number << 24 | devfn << 16;
int ret;
ret = mpc83xx_pcie_exclude_device(bus, devfn);
if (ret)
return NULL;
offset &= 0xfff;
/* Type 0 */
if (bus->number == hose->first_busno)
return pcie->cfg_type0 + offset;
if (pcie->dev_base == dev_base)
goto mapped;
out_le32(pcie->cfg_type0 + PEX_OUTWIN0_TAL, dev_base);
pcie->dev_base = dev_base;
mapped:
return pcie->cfg_type1 + offset;
}
static int mpc83xx_pcie_write_config(struct pci_bus *bus, unsigned int devfn,
int offset, int len, u32 val)
{
struct pci_controller *hose = pci_bus_to_host(bus);
/* PPC_INDIRECT_TYPE_SURPRESS_PRIMARY_BUS */
if (offset == PCI_PRIMARY_BUS && bus->number == hose->first_busno)
val &= 0xffffff00;
return pci_generic_config_write(bus, devfn, offset, len, val);
}
static struct pci_ops mpc83xx_pcie_ops = {
.map_bus = mpc83xx_pcie_remap_cfg,
.read = pci_generic_config_read,
.write = mpc83xx_pcie_write_config,
};
static int __init mpc83xx_pcie_setup(struct pci_controller *hose,
struct resource *reg)
{
struct mpc83xx_pcie_priv *pcie;
u32 cfg_bar;
int ret = -ENOMEM;
pcie = zalloc_maybe_bootmem(sizeof(*pcie), GFP_KERNEL);
if (!pcie)
return ret;
pcie->cfg_type0 = ioremap(reg->start, resource_size(reg));
if (!pcie->cfg_type0)
goto err0;
cfg_bar = in_le32(pcie->cfg_type0 + PEX_OUTWIN0_BAR);
if (!cfg_bar) {
/* PCI-E isn't configured. */
ret = -ENODEV;
goto err1;
}
pcie->cfg_type1 = ioremap(cfg_bar, 0x1000);
if (!pcie->cfg_type1)
goto err1;
WARN_ON(hose->dn->data);
hose->dn->data = pcie;
hose->ops = &mpc83xx_pcie_ops;
hose->indirect_type |= PPC_INDIRECT_TYPE_FSL_CFG_REG_LINK;
out_le32(pcie->cfg_type0 + PEX_OUTWIN0_TAH, 0);
out_le32(pcie->cfg_type0 + PEX_OUTWIN0_TAL, 0);
if (fsl_pcie_check_link(hose))
hose->indirect_type |= PPC_INDIRECT_TYPE_NO_PCIE_LINK;
return 0;
err1:
iounmap(pcie->cfg_type0);
err0:
kfree(pcie);
return ret;
}
int __init mpc83xx_add_bridge(struct device_node *dev)
{
int ret;
int len;
struct pci_controller *hose;
struct resource rsrc_reg;
struct resource rsrc_cfg;
const int *bus_range;
int primary;
is_mpc83xx_pci = 1;
if (!of_device_is_available(dev)) {
pr_warn("%pOF: disabled by the firmware.\n",
dev);
return -ENODEV;
}
pr_debug("Adding PCI host bridge %pOF\n", dev);
/* Fetch host bridge registers address */
if (of_address_to_resource(dev, 0, &rsrc_reg)) {
printk(KERN_WARNING "Can't get pci register base!\n");
return -ENOMEM;
}
memset(&rsrc_cfg, 0, sizeof(rsrc_cfg));
if (of_address_to_resource(dev, 1, &rsrc_cfg)) {
printk(KERN_WARNING
"No pci config register base in dev tree, "
"using default\n");
/*
* MPC83xx supports up to two host controllers
* one at 0x8500 has config space registers at 0x8300
* one at 0x8600 has config space registers at 0x8380
*/
if ((rsrc_reg.start & 0xfffff) == 0x8500)
rsrc_cfg.start = (rsrc_reg.start & 0xfff00000) + 0x8300;
else if ((rsrc_reg.start & 0xfffff) == 0x8600)
rsrc_cfg.start = (rsrc_reg.start & 0xfff00000) + 0x8380;
}
/*
* Controller at offset 0x8500 is primary
*/
if ((rsrc_reg.start & 0xfffff) == 0x8500)
primary = 1;
else
primary = 0;
/* Get bus range if any */
bus_range = of_get_property(dev, "bus-range", &len);
if (bus_range == NULL || len < 2 * sizeof(int)) {
printk(KERN_WARNING "Can't get bus-range for %pOF, assume"
" bus 0\n", dev);
}
pci_add_flags(PCI_REASSIGN_ALL_BUS);
hose = pcibios_alloc_controller(dev);
if (!hose)
return -ENOMEM;
hose->first_busno = bus_range ? bus_range[0] : 0;
hose->last_busno = bus_range ? bus_range[1] : 0xff;
if (of_device_is_compatible(dev, "fsl,mpc8314-pcie")) {
ret = mpc83xx_pcie_setup(hose, &rsrc_reg);
if (ret)
goto err0;
} else {
setup_indirect_pci(hose, rsrc_cfg.start,
rsrc_cfg.start + 4, 0);
}
printk(KERN_INFO "Found FSL PCI host bridge at 0x%016llx. "
"Firmware bus number: %d->%d\n",
(unsigned long long)rsrc_reg.start, hose->first_busno,
hose->last_busno);
pr_debug(" ->Hose at 0x%p, cfg_addr=0x%p,cfg_data=0x%p\n",
hose, hose->cfg_addr, hose->cfg_data);
/* Interpret the "ranges" property */
/* This also maps the I/O region and sets isa_io/mem_base */
pci_process_bridge_OF_ranges(hose, dev, primary);
return 0;
err0:
pcibios_free_controller(hose);
return ret;
}
#endif /* CONFIG_PPC_83xx */
u64 fsl_pci_immrbar_base(struct pci_controller *hose)
{
#ifdef CONFIG_PPC_83xx
if (is_mpc83xx_pci) {
struct mpc83xx_pcie_priv *pcie = hose->dn->data;
struct pex_inbound_window *in;
int i;
/* Walk the Root Complex Inbound windows to match IMMR base */
in = pcie->cfg_type0 + PEX_RC_INWIN_BASE;
for (i = 0; i < 4; i++) {
/* not enabled, skip */
if (!(in_le32(&in[i].ar) & PEX_RCIWARn_EN))
continue;
if (get_immrbase() == in_le32(&in[i].tar))
return (u64)in_le32(&in[i].barh) << 32 |
in_le32(&in[i].barl);
}
printk(KERN_WARNING "could not find PCI BAR matching IMMR\n");
}
#endif
#if defined(CONFIG_FSL_SOC_BOOKE) || defined(CONFIG_PPC_86xx)
if (!is_mpc83xx_pci) {
u32 base;
pci_bus_read_config_dword(hose->bus,
PCI_DEVFN(0, 0), PCI_BASE_ADDRESS_0, &base);
/*
* For PEXCSRBAR, bit 3-0 indicate prefetchable and
* address type. So when getting base address, these
* bits should be masked
*/
base &= PCI_BASE_ADDRESS_MEM_MASK;
return base;
}
#endif
return 0;
}
#ifdef CONFIG_PPC_E500
static int mcheck_handle_load(struct pt_regs *regs, u32 inst)
{
unsigned int rd, ra, rb, d;
rd = get_rt(inst);
ra = get_ra(inst);
rb = get_rb(inst);
d = get_d(inst);
switch (get_op(inst)) {
case 31:
switch (get_xop(inst)) {
case OP_31_XOP_LWZX:
case OP_31_XOP_LWBRX:
regs->gpr[rd] = 0xffffffff;
break;
case OP_31_XOP_LWZUX:
regs->gpr[rd] = 0xffffffff;
regs->gpr[ra] += regs->gpr[rb];
break;
case OP_31_XOP_LBZX:
regs->gpr[rd] = 0xff;
break;
case OP_31_XOP_LBZUX:
regs->gpr[rd] = 0xff;
regs->gpr[ra] += regs->gpr[rb];
break;
case OP_31_XOP_LHZX:
case OP_31_XOP_LHBRX:
regs->gpr[rd] = 0xffff;
break;
case OP_31_XOP_LHZUX:
regs->gpr[rd] = 0xffff;
regs->gpr[ra] += regs->gpr[rb];
break;
case OP_31_XOP_LHAX:
regs->gpr[rd] = ~0UL;
break;
case OP_31_XOP_LHAUX:
regs->gpr[rd] = ~0UL;
regs->gpr[ra] += regs->gpr[rb];
break;
default:
return 0;
}
break;
case OP_LWZ:
regs->gpr[rd] = 0xffffffff;
break;
case OP_LWZU:
regs->gpr[rd] = 0xffffffff;
regs->gpr[ra] += (s16)d;
break;
case OP_LBZ:
regs->gpr[rd] = 0xff;
break;
case OP_LBZU:
regs->gpr[rd] = 0xff;
regs->gpr[ra] += (s16)d;
break;
case OP_LHZ:
regs->gpr[rd] = 0xffff;
break;
case OP_LHZU:
regs->gpr[rd] = 0xffff;
regs->gpr[ra] += (s16)d;
break;
case OP_LHA:
regs->gpr[rd] = ~0UL;
break;
case OP_LHAU:
regs->gpr[rd] = ~0UL;
regs->gpr[ra] += (s16)d;
break;
default:
return 0;
}
return 1;
}
static int is_in_pci_mem_space(phys_addr_t addr)
{
struct pci_controller *hose;
struct resource *res;
int i;
list_for_each_entry(hose, &hose_list, list_node) {
if (!(hose->indirect_type & PPC_INDIRECT_TYPE_EXT_REG))
continue;
for (i = 0; i < 3; i++) {
res = &hose->mem_resources[i];
if ((res->flags & IORESOURCE_MEM) &&
addr >= res->start && addr <= res->end)
return 1;
}
}
return 0;
}
int fsl_pci_mcheck_exception(struct pt_regs *regs)
{
u32 inst;
int ret;
phys_addr_t addr = 0;
/* Let KVM/QEMU deal with the exception */
if (regs->msr & MSR_GS)
return 0;
#ifdef CONFIG_PHYS_64BIT
addr = mfspr(SPRN_MCARU);
addr <<= 32;
#endif
addr += mfspr(SPRN_MCAR);
if (is_in_pci_mem_space(addr)) {
if (user_mode(regs))
ret = copy_from_user_nofault(&inst,
(void __user *)regs->nip, sizeof(inst));
else
ret = get_kernel_nofault(inst, (void *)regs->nip);
if (!ret && mcheck_handle_load(regs, inst)) {
regs_add_return_ip(regs, 4);
return 1;
}
}
return 0;
}
#endif
#if defined(CONFIG_FSL_SOC_BOOKE) || defined(CONFIG_PPC_86xx)
static const struct of_device_id pci_ids[] = {
{ .compatible = "fsl,mpc8540-pci", },
{ .compatible = "fsl,mpc8548-pcie", },
{ .compatible = "fsl,mpc8610-pci", },
{ .compatible = "fsl,mpc8641-pcie", },
{ .compatible = "fsl,qoriq-pcie", },
{ .compatible = "fsl,qoriq-pcie-v2.1", },
{ .compatible = "fsl,qoriq-pcie-v2.2", },
{ .compatible = "fsl,qoriq-pcie-v2.3", },
{ .compatible = "fsl,qoriq-pcie-v2.4", },
{ .compatible = "fsl,qoriq-pcie-v3.0", },
/*
* The following entries are for compatibility with older device
* trees.
*/
{ .compatible = "fsl,p1022-pcie", },
{ .compatible = "fsl,p4080-pcie", },
{},
};
struct device_node *fsl_pci_primary;
void __init fsl_pci_assign_primary(void)
{
struct device_node *np;
/* Callers can specify the primary bus using other means. */
if (fsl_pci_primary)
return;
/* If a PCI host bridge contains an ISA node, it's primary. */
np = of_find_node_by_type(NULL, "isa");
while ((fsl_pci_primary = of_get_parent(np))) {
of_node_put(np);
np = fsl_pci_primary;
if (of_match_node(pci_ids, np) && of_device_is_available(np))
return;
}
/*
* If there's no PCI host bridge with ISA, arbitrarily
* designate one as primary. This can go away once
* various bugs with primary-less systems are fixed.
*/
for_each_matching_node(np, pci_ids) {
if (of_device_is_available(np)) {
fsl_pci_primary = np;
return;
}
}
}
#ifdef CONFIG_PM_SLEEP
static irqreturn_t fsl_pci_pme_handle(int irq, void *dev_id)
{
struct pci_controller *hose = dev_id;
struct ccsr_pci __iomem *pci = hose->private_data;
u32 dr;
dr = in_be32(&pci->pex_pme_mes_dr);
if (!dr)
return IRQ_NONE;
out_be32(&pci->pex_pme_mes_dr, dr);
return IRQ_HANDLED;
}
static int fsl_pci_pme_probe(struct pci_controller *hose)
{
struct ccsr_pci __iomem *pci;
struct pci_dev *dev;
int pme_irq;
int res;
u16 pms;
/* Get hose's pci_dev */
dev = list_first_entry(&hose->bus->devices, typeof(*dev), bus_list);
/* PME Disable */
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pms);
pms &= ~PCI_PM_CTRL_PME_ENABLE;
pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pms);
pme_irq = irq_of_parse_and_map(hose->dn, 0);
if (!pme_irq) {
dev_err(&dev->dev, "Failed to map PME interrupt.\n");
return -ENXIO;
}
res = devm_request_irq(hose->parent, pme_irq,
fsl_pci_pme_handle,
IRQF_SHARED,
"[PCI] PME", hose);
if (res < 0) {
dev_err(&dev->dev, "Unable to request irq %d for PME\n", pme_irq);
irq_dispose_mapping(pme_irq);
return -ENODEV;
}
pci = hose->private_data;
/* Enable PTOD, ENL23D & EXL23D */
clrbits32(&pci->pex_pme_mes_disr,
PME_DISR_EN_PTOD | PME_DISR_EN_ENL23D | PME_DISR_EN_EXL23D);
out_be32(&pci->pex_pme_mes_ier, 0);
setbits32(&pci->pex_pme_mes_ier,
PME_DISR_EN_PTOD | PME_DISR_EN_ENL23D | PME_DISR_EN_EXL23D);
/* PME Enable */
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pms);
pms |= PCI_PM_CTRL_PME_ENABLE;
pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pms);
return 0;
}
static void send_pme_turnoff_message(struct pci_controller *hose)
{
struct ccsr_pci __iomem *pci = hose->private_data;
u32 dr;
int i;
/* Send PME_Turn_Off Message Request */
setbits32(&pci->pex_pmcr, PEX_PMCR_PTOMR);
/* Wait trun off done */
for (i = 0; i < 150; i++) {
dr = in_be32(&pci->pex_pme_mes_dr);
if (dr) {
out_be32(&pci->pex_pme_mes_dr, dr);
break;
}
udelay(1000);
}
}
static void fsl_pci_syscore_do_suspend(struct pci_controller *hose)
{
send_pme_turnoff_message(hose);
}
static int fsl_pci_syscore_suspend(void)
{
struct pci_controller *hose, *tmp;
list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
fsl_pci_syscore_do_suspend(hose);
return 0;
}
static void fsl_pci_syscore_do_resume(struct pci_controller *hose)
{
struct ccsr_pci __iomem *pci = hose->private_data;
u32 dr;
int i;
/* Send Exit L2 State Message */
setbits32(&pci->pex_pmcr, PEX_PMCR_EXL2S);
/* Wait exit done */
for (i = 0; i < 150; i++) {
dr = in_be32(&pci->pex_pme_mes_dr);
if (dr) {
out_be32(&pci->pex_pme_mes_dr, dr);
break;
}
udelay(1000);
}
setup_pci_atmu(hose);
}
static void fsl_pci_syscore_resume(void)
{
struct pci_controller *hose, *tmp;
list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
fsl_pci_syscore_do_resume(hose);
}
static struct syscore_ops pci_syscore_pm_ops = {
.suspend = fsl_pci_syscore_suspend,
.resume = fsl_pci_syscore_resume,
};
#endif
void fsl_pcibios_fixup_phb(struct pci_controller *phb)
{
#ifdef CONFIG_PM_SLEEP
fsl_pci_pme_probe(phb);
#endif
}
static int add_err_dev(struct platform_device *pdev)
{
struct platform_device *errdev;
struct mpc85xx_edac_pci_plat_data pd = {
.of_node = pdev->dev.of_node
};
errdev = platform_device_register_resndata(&pdev->dev,
"mpc85xx-pci-edac",
PLATFORM_DEVID_AUTO,
pdev->resource,
pdev->num_resources,
&pd, sizeof(pd));
return PTR_ERR_OR_ZERO(errdev);
}
static int fsl_pci_probe(struct platform_device *pdev)
{
struct device_node *node;
int ret;
node = pdev->dev.of_node;
ret = fsl_add_bridge(pdev, fsl_pci_primary == node);
if (ret)
return ret;
ret = add_err_dev(pdev);
if (ret)
dev_err(&pdev->dev, "couldn't register error device: %d\n",
ret);
return 0;
}
static struct platform_driver fsl_pci_driver = {
.driver = {
.name = "fsl-pci",
.of_match_table = pci_ids,
},
.probe = fsl_pci_probe,
};
static int __init fsl_pci_init(void)
{
#ifdef CONFIG_PM_SLEEP
register_syscore_ops(&pci_syscore_pm_ops);
#endif
return platform_driver_register(&fsl_pci_driver);
}
arch_initcall(fsl_pci_init);
#endif