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alistair23-linux/arch/mips/pci/ops-tx4927.c
Sebastian Andrzej Siewior 85a053fa5f MIPS: PCI: Move fixups from __init to __devinit. 
Fixups are executed once the pci-device is found which is during boot
process so __init seems fine as long as the platform does not support
hotplug.
However it is possible to remove the PCI bus at run time and have it
rediscovered again via "echo 1 > /sys/bus/pci/rescan" and this will call
the fixups again.

[ralf@linux-mips.org: Made piixirqmap[] in malta_piix_func0_fixup()
__initdata.]

Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Cc: linux-mips@linux-mips.org
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2012-07-19 11:27:23 +02:00

528 lines
16 KiB
C
Raw Blame History

/*
* Define the pci_ops for the PCIC on Toshiba TX4927, TX4938, etc.
*
* Based on linux/arch/mips/pci/ops-tx4938.c,
* linux/arch/mips/pci/fixup-rbtx4938.c,
* linux/arch/mips/txx9/rbtx4938/setup.c,
* and RBTX49xx patch from CELF patch archive.
*
* 2003-2005 (c) MontaVista Software, Inc.
* Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org)
* (C) Copyright TOSHIBA CORPORATION 2000-2001, 2004-2007
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <asm/txx9/pci.h>
#include <asm/txx9/tx4927pcic.h>
static struct {
struct pci_controller *channel;
struct tx4927_pcic_reg __iomem *pcicptr;
} pcicptrs[2]; /* TX4938 has 2 pcic */
static void __init set_tx4927_pcicptr(struct pci_controller *channel,
struct tx4927_pcic_reg __iomem *pcicptr)
{
int i;
for (i = 0; i < ARRAY_SIZE(pcicptrs); i++) {
if (pcicptrs[i].channel == channel) {
pcicptrs[i].pcicptr = pcicptr;
return;
}
}
for (i = 0; i < ARRAY_SIZE(pcicptrs); i++) {
if (!pcicptrs[i].channel) {
pcicptrs[i].channel = channel;
pcicptrs[i].pcicptr = pcicptr;
return;
}
}
BUG();
}
struct tx4927_pcic_reg __iomem *get_tx4927_pcicptr(
struct pci_controller *channel)
{
int i;
for (i = 0; i < ARRAY_SIZE(pcicptrs); i++) {
if (pcicptrs[i].channel == channel)
return pcicptrs[i].pcicptr;
}
return NULL;
}
static int mkaddr(struct pci_bus *bus, unsigned int devfn, int where,
struct tx4927_pcic_reg __iomem *pcicptr)
{
if (bus->parent == NULL &&
devfn >= PCI_DEVFN(TX4927_PCIC_MAX_DEVNU, 0))
return -1;
__raw_writel(((bus->number & 0xff) << 0x10)
| ((devfn & 0xff) << 0x08) | (where & 0xfc)
| (bus->parent ? 1 : 0),
&pcicptr->g2pcfgadrs);
/* clear M_ABORT and Disable M_ABORT Int. */
__raw_writel((__raw_readl(&pcicptr->pcistatus) & 0x0000ffff)
| (PCI_STATUS_REC_MASTER_ABORT << 16),
&pcicptr->pcistatus);
return 0;
}
static int check_abort(struct tx4927_pcic_reg __iomem *pcicptr)
{
int code = PCIBIOS_SUCCESSFUL;
/* wait write cycle completion before checking error status */
while (__raw_readl(&pcicptr->pcicstatus) & TX4927_PCIC_PCICSTATUS_IWB)
;
if (__raw_readl(&pcicptr->pcistatus)
& (PCI_STATUS_REC_MASTER_ABORT << 16)) {
__raw_writel((__raw_readl(&pcicptr->pcistatus) & 0x0000ffff)
| (PCI_STATUS_REC_MASTER_ABORT << 16),
&pcicptr->pcistatus);
/* flush write buffer */
iob();
code = PCIBIOS_DEVICE_NOT_FOUND;
}
return code;
}
static u8 icd_readb(int offset, struct tx4927_pcic_reg __iomem *pcicptr)
{
#ifdef __BIG_ENDIAN
offset ^= 3;
#endif
return __raw_readb((void __iomem *)&pcicptr->g2pcfgdata + offset);
}
static u16 icd_readw(int offset, struct tx4927_pcic_reg __iomem *pcicptr)
{
#ifdef __BIG_ENDIAN
offset ^= 2;
#endif
return __raw_readw((void __iomem *)&pcicptr->g2pcfgdata + offset);
}
static u32 icd_readl(struct tx4927_pcic_reg __iomem *pcicptr)
{
return __raw_readl(&pcicptr->g2pcfgdata);
}
static void icd_writeb(u8 val, int offset,
struct tx4927_pcic_reg __iomem *pcicptr)
{
#ifdef __BIG_ENDIAN
offset ^= 3;
#endif
__raw_writeb(val, (void __iomem *)&pcicptr->g2pcfgdata + offset);
}
static void icd_writew(u16 val, int offset,
struct tx4927_pcic_reg __iomem *pcicptr)
{
#ifdef __BIG_ENDIAN
offset ^= 2;
#endif
__raw_writew(val, (void __iomem *)&pcicptr->g2pcfgdata + offset);
}
static void icd_writel(u32 val, struct tx4927_pcic_reg __iomem *pcicptr)
{
__raw_writel(val, &pcicptr->g2pcfgdata);
}
static struct tx4927_pcic_reg __iomem *pci_bus_to_pcicptr(struct pci_bus *bus)
{
struct pci_controller *channel = bus->sysdata;
return get_tx4927_pcicptr(channel);
}
static int tx4927_pci_config_read(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 *val)
{
struct tx4927_pcic_reg __iomem *pcicptr = pci_bus_to_pcicptr(bus);
if (mkaddr(bus, devfn, where, pcicptr)) {
*val = 0xffffffff;
return -1;
}
switch (size) {
case 1:
*val = icd_readb(where & 3, pcicptr);
break;
case 2:
*val = icd_readw(where & 3, pcicptr);
break;
default:
*val = icd_readl(pcicptr);
}
return check_abort(pcicptr);
}
static int tx4927_pci_config_write(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 val)
{
struct tx4927_pcic_reg __iomem *pcicptr = pci_bus_to_pcicptr(bus);
if (mkaddr(bus, devfn, where, pcicptr))
return -1;
switch (size) {
case 1:
icd_writeb(val, where & 3, pcicptr);
break;
case 2:
icd_writew(val, where & 3, pcicptr);
break;
default:
icd_writel(val, pcicptr);
}
return check_abort(pcicptr);
}
static struct pci_ops tx4927_pci_ops = {
.read = tx4927_pci_config_read,
.write = tx4927_pci_config_write,
};
static struct {
u8 trdyto;
u8 retryto;
u16 gbwc;
} tx4927_pci_opts __devinitdata = {
.trdyto = 0,
.retryto = 0,
.gbwc = 0xfe0, /* 4064 GBUSCLK for CCFG.GTOT=0b11 */
};
char *__devinit tx4927_pcibios_setup(char *str)
{
unsigned long val;
if (!strncmp(str, "trdyto=", 7)) {
if (strict_strtoul(str + 7, 0, &val) == 0)
tx4927_pci_opts.trdyto = val;
return NULL;
}
if (!strncmp(str, "retryto=", 8)) {
if (strict_strtoul(str + 8, 0, &val) == 0)
tx4927_pci_opts.retryto = val;
return NULL;
}
if (!strncmp(str, "gbwc=", 5)) {
if (strict_strtoul(str + 5, 0, &val) == 0)
tx4927_pci_opts.gbwc = val;
return NULL;
}
return str;
}
void __init tx4927_pcic_setup(struct tx4927_pcic_reg __iomem *pcicptr,
struct pci_controller *channel, int extarb)
{
int i;
unsigned long flags;
set_tx4927_pcicptr(channel, pcicptr);
if (!channel->pci_ops)
printk(KERN_INFO
"PCIC -- DID:%04x VID:%04x RID:%02x Arbiter:%s\n",
__raw_readl(&pcicptr->pciid) >> 16,
__raw_readl(&pcicptr->pciid) & 0xffff,
__raw_readl(&pcicptr->pciccrev) & 0xff,
extarb ? "External" : "Internal");
channel->pci_ops = &tx4927_pci_ops;
local_irq_save(flags);
/* Disable All Initiator Space */
__raw_writel(__raw_readl(&pcicptr->pciccfg)
& ~(TX4927_PCIC_PCICCFG_G2PMEN(0)
| TX4927_PCIC_PCICCFG_G2PMEN(1)
| TX4927_PCIC_PCICCFG_G2PMEN(2)
| TX4927_PCIC_PCICCFG_G2PIOEN),
&pcicptr->pciccfg);
/* GB->PCI mappings */
__raw_writel((channel->io_resource->end - channel->io_resource->start)
>> 4,
&pcicptr->g2piomask);
____raw_writeq((channel->io_resource->start +
channel->io_map_base - IO_BASE) |
#ifdef __BIG_ENDIAN
TX4927_PCIC_G2PIOGBASE_ECHG
#else
TX4927_PCIC_G2PIOGBASE_BSDIS
#endif
, &pcicptr->g2piogbase);
____raw_writeq(channel->io_resource->start - channel->io_offset,
&pcicptr->g2piopbase);
for (i = 0; i < 3; i++) {
__raw_writel(0, &pcicptr->g2pmmask[i]);
____raw_writeq(0, &pcicptr->g2pmgbase[i]);
____raw_writeq(0, &pcicptr->g2pmpbase[i]);
}
if (channel->mem_resource->end) {
__raw_writel((channel->mem_resource->end
- channel->mem_resource->start) >> 4,
&pcicptr->g2pmmask[0]);
____raw_writeq(channel->mem_resource->start |
#ifdef __BIG_ENDIAN
TX4927_PCIC_G2PMnGBASE_ECHG
#else
TX4927_PCIC_G2PMnGBASE_BSDIS
#endif
, &pcicptr->g2pmgbase[0]);
____raw_writeq(channel->mem_resource->start -
channel->mem_offset,
&pcicptr->g2pmpbase[0]);
}
/* PCI->GB mappings (I/O 256B) */
__raw_writel(0, &pcicptr->p2giopbase); /* 256B */
____raw_writeq(0, &pcicptr->p2giogbase);
/* PCI->GB mappings (MEM 512MB (64MB on R1.x)) */
__raw_writel(0, &pcicptr->p2gm0plbase);
__raw_writel(0, &pcicptr->p2gm0pubase);
____raw_writeq(TX4927_PCIC_P2GMnGBASE_TMEMEN |
#ifdef __BIG_ENDIAN
TX4927_PCIC_P2GMnGBASE_TECHG
#else
TX4927_PCIC_P2GMnGBASE_TBSDIS
#endif
, &pcicptr->p2gmgbase[0]);
/* PCI->GB mappings (MEM 16MB) */
__raw_writel(0xffffffff, &pcicptr->p2gm1plbase);
__raw_writel(0xffffffff, &pcicptr->p2gm1pubase);
____raw_writeq(0, &pcicptr->p2gmgbase[1]);
/* PCI->GB mappings (MEM 1MB) */
__raw_writel(0xffffffff, &pcicptr->p2gm2pbase); /* 1MB */
____raw_writeq(0, &pcicptr->p2gmgbase[2]);
/* Clear all (including IRBER) except for GBWC */
__raw_writel((tx4927_pci_opts.gbwc << 16)
& TX4927_PCIC_PCICCFG_GBWC_MASK,
&pcicptr->pciccfg);
/* Enable Initiator Memory Space */
if (channel->mem_resource->end)
__raw_writel(__raw_readl(&pcicptr->pciccfg)
| TX4927_PCIC_PCICCFG_G2PMEN(0),
&pcicptr->pciccfg);
/* Enable Initiator I/O Space */
if (channel->io_resource->end)
__raw_writel(__raw_readl(&pcicptr->pciccfg)
| TX4927_PCIC_PCICCFG_G2PIOEN,
&pcicptr->pciccfg);
/* Enable Initiator Config */
__raw_writel(__raw_readl(&pcicptr->pciccfg)
| TX4927_PCIC_PCICCFG_ICAEN | TX4927_PCIC_PCICCFG_TCAR,
&pcicptr->pciccfg);
/* Do not use MEMMUL, MEMINF: YMFPCI card causes M_ABORT. */
__raw_writel(0, &pcicptr->pcicfg1);
__raw_writel((__raw_readl(&pcicptr->g2ptocnt) & ~0xffff)
| (tx4927_pci_opts.trdyto & 0xff)
| ((tx4927_pci_opts.retryto & 0xff) << 8),
&pcicptr->g2ptocnt);
/* Clear All Local Bus Status */
__raw_writel(TX4927_PCIC_PCICSTATUS_ALL, &pcicptr->pcicstatus);
/* Enable All Local Bus Interrupts */
__raw_writel(TX4927_PCIC_PCICSTATUS_ALL, &pcicptr->pcicmask);
/* Clear All Initiator Status */
__raw_writel(TX4927_PCIC_G2PSTATUS_ALL, &pcicptr->g2pstatus);
/* Enable All Initiator Interrupts */
__raw_writel(TX4927_PCIC_G2PSTATUS_ALL, &pcicptr->g2pmask);
/* Clear All PCI Status Error */
__raw_writel((__raw_readl(&pcicptr->pcistatus) & 0x0000ffff)
| (TX4927_PCIC_PCISTATUS_ALL << 16),
&pcicptr->pcistatus);
/* Enable All PCI Status Error Interrupts */
__raw_writel(TX4927_PCIC_PCISTATUS_ALL, &pcicptr->pcimask);
if (!extarb) {
/* Reset Bus Arbiter */
__raw_writel(TX4927_PCIC_PBACFG_RPBA, &pcicptr->pbacfg);
__raw_writel(0, &pcicptr->pbabm);
/* Enable Bus Arbiter */
__raw_writel(TX4927_PCIC_PBACFG_PBAEN, &pcicptr->pbacfg);
}
__raw_writel(PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY
| PCI_COMMAND_PARITY | PCI_COMMAND_SERR,
&pcicptr->pcistatus);
local_irq_restore(flags);
printk(KERN_DEBUG
"PCI: COMMAND=%04x,PCIMASK=%04x,"
"TRDYTO=%02x,RETRYTO=%02x,GBWC=%03x\n",
__raw_readl(&pcicptr->pcistatus) & 0xffff,
__raw_readl(&pcicptr->pcimask) & 0xffff,
__raw_readl(&pcicptr->g2ptocnt) & 0xff,
(__raw_readl(&pcicptr->g2ptocnt) & 0xff00) >> 8,
(__raw_readl(&pcicptr->pciccfg) >> 16) & 0xfff);
}
static void tx4927_report_pcic_status1(struct tx4927_pcic_reg __iomem *pcicptr)
{
__u16 pcistatus = (__u16)(__raw_readl(&pcicptr->pcistatus) >> 16);
__u32 g2pstatus = __raw_readl(&pcicptr->g2pstatus);
__u32 pcicstatus = __raw_readl(&pcicptr->pcicstatus);
static struct {
__u32 flag;
const char *str;
} pcistat_tbl[] = {
{ PCI_STATUS_DETECTED_PARITY, "DetectedParityError" },
{ PCI_STATUS_SIG_SYSTEM_ERROR, "SignaledSystemError" },
{ PCI_STATUS_REC_MASTER_ABORT, "ReceivedMasterAbort" },
{ PCI_STATUS_REC_TARGET_ABORT, "ReceivedTargetAbort" },
{ PCI_STATUS_SIG_TARGET_ABORT, "SignaledTargetAbort" },
{ PCI_STATUS_PARITY, "MasterParityError" },
}, g2pstat_tbl[] = {
{ TX4927_PCIC_G2PSTATUS_TTOE, "TIOE" },
{ TX4927_PCIC_G2PSTATUS_RTOE, "RTOE" },
}, pcicstat_tbl[] = {
{ TX4927_PCIC_PCICSTATUS_PME, "PME" },
{ TX4927_PCIC_PCICSTATUS_TLB, "TLB" },
{ TX4927_PCIC_PCICSTATUS_NIB, "NIB" },
{ TX4927_PCIC_PCICSTATUS_ZIB, "ZIB" },
{ TX4927_PCIC_PCICSTATUS_PERR, "PERR" },
{ TX4927_PCIC_PCICSTATUS_SERR, "SERR" },
{ TX4927_PCIC_PCICSTATUS_GBE, "GBE" },
{ TX4927_PCIC_PCICSTATUS_IWB, "IWB" },
};
int i, cont;
printk(KERN_ERR "");
if (pcistatus & TX4927_PCIC_PCISTATUS_ALL) {
printk(KERN_CONT "pcistat:%04x(", pcistatus);
for (i = 0, cont = 0; i < ARRAY_SIZE(pcistat_tbl); i++)
if (pcistatus & pcistat_tbl[i].flag)
printk(KERN_CONT "%s%s",
cont++ ? " " : "", pcistat_tbl[i].str);
printk(KERN_CONT ") ");
}
if (g2pstatus & TX4927_PCIC_G2PSTATUS_ALL) {
printk(KERN_CONT "g2pstatus:%08x(", g2pstatus);
for (i = 0, cont = 0; i < ARRAY_SIZE(g2pstat_tbl); i++)
if (g2pstatus & g2pstat_tbl[i].flag)
printk(KERN_CONT "%s%s",
cont++ ? " " : "", g2pstat_tbl[i].str);
printk(KERN_CONT ") ");
}
if (pcicstatus & TX4927_PCIC_PCICSTATUS_ALL) {
printk(KERN_CONT "pcicstatus:%08x(", pcicstatus);
for (i = 0, cont = 0; i < ARRAY_SIZE(pcicstat_tbl); i++)
if (pcicstatus & pcicstat_tbl[i].flag)
printk(KERN_CONT "%s%s",
cont++ ? " " : "", pcicstat_tbl[i].str);
printk(KERN_CONT ")");
}
printk(KERN_CONT "\n");
}
void tx4927_report_pcic_status(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(pcicptrs); i++) {
if (pcicptrs[i].pcicptr)
tx4927_report_pcic_status1(pcicptrs[i].pcicptr);
}
}
static void tx4927_dump_pcic_settings1(struct tx4927_pcic_reg __iomem *pcicptr)
{
int i;
__u32 __iomem *preg = (__u32 __iomem *)pcicptr;
printk(KERN_INFO "tx4927 pcic (0x%p) settings:", pcicptr);
for (i = 0; i < sizeof(struct tx4927_pcic_reg); i += 4, preg++) {
if (i % 32 == 0) {
printk(KERN_CONT "\n");
printk(KERN_INFO "%04x:", i);
}
/* skip registers with side-effects */
if (i == offsetof(struct tx4927_pcic_reg, g2pintack)
|| i == offsetof(struct tx4927_pcic_reg, g2pspc)
|| i == offsetof(struct tx4927_pcic_reg, g2pcfgadrs)
|| i == offsetof(struct tx4927_pcic_reg, g2pcfgdata)) {
printk(KERN_CONT " XXXXXXXX");
continue;
}
printk(KERN_CONT " %08x", __raw_readl(preg));
}
printk(KERN_CONT "\n");
}
void tx4927_dump_pcic_settings(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(pcicptrs); i++) {
if (pcicptrs[i].pcicptr)
tx4927_dump_pcic_settings1(pcicptrs[i].pcicptr);
}
}
irqreturn_t tx4927_pcierr_interrupt(int irq, void *dev_id)
{
struct pt_regs *regs = get_irq_regs();
struct tx4927_pcic_reg __iomem *pcicptr =
(struct tx4927_pcic_reg __iomem *)(unsigned long)dev_id;
if (txx9_pci_err_action != TXX9_PCI_ERR_IGNORE) {
printk(KERN_WARNING "PCIERR interrupt at 0x%0*lx\n",
(int)(2 * sizeof(unsigned long)), regs->cp0_epc);
tx4927_report_pcic_status1(pcicptr);
}
if (txx9_pci_err_action != TXX9_PCI_ERR_PANIC) {
/* clear all pci errors */
__raw_writel((__raw_readl(&pcicptr->pcistatus) & 0x0000ffff)
| (TX4927_PCIC_PCISTATUS_ALL << 16),
&pcicptr->pcistatus);
__raw_writel(TX4927_PCIC_G2PSTATUS_ALL, &pcicptr->g2pstatus);
__raw_writel(TX4927_PCIC_PBASTATUS_ALL, &pcicptr->pbastatus);
__raw_writel(TX4927_PCIC_PCICSTATUS_ALL, &pcicptr->pcicstatus);
return IRQ_HANDLED;
}
console_verbose();
tx4927_dump_pcic_settings1(pcicptr);
panic("PCI error.");
}
#ifdef CONFIG_TOSHIBA_FPCIB0
static void __devinit tx4927_quirk_slc90e66_bridge(struct pci_dev *dev)
{
struct tx4927_pcic_reg __iomem *pcicptr = pci_bus_to_pcicptr(dev->bus);
if (!pcicptr)
return;
if (__raw_readl(&pcicptr->pbacfg) & TX4927_PCIC_PBACFG_PBAEN) {
/* Reset Bus Arbiter */
__raw_writel(TX4927_PCIC_PBACFG_RPBA, &pcicptr->pbacfg);
/*
* swap reqBP and reqXP (raise priority of SLC90E66).
* SLC90E66(PCI-ISA bridge) is connected to REQ2 on
* PCI Backplane board.
*/
__raw_writel(0x72543610, &pcicptr->pbareqport);
__raw_writel(0, &pcicptr->pbabm);
/* Use Fixed ParkMaster (required by SLC90E66) */
__raw_writel(TX4927_PCIC_PBACFG_FIXPA, &pcicptr->pbacfg);
/* Enable Bus Arbiter */
__raw_writel(TX4927_PCIC_PBACFG_FIXPA |
TX4927_PCIC_PBACFG_PBAEN,
&pcicptr->pbacfg);
printk(KERN_INFO "PCI: Use Fixed Park Master (REQPORT %08x)\n",
__raw_readl(&pcicptr->pbareqport));
}
}
#define PCI_DEVICE_ID_EFAR_SLC90E66_0 0x9460
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_EFAR, PCI_DEVICE_ID_EFAR_SLC90E66_0,
tx4927_quirk_slc90e66_bridge);
#endif
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