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kernel/arch/arm/plat-iop/pci.c
Rob Herring dd9bf78040 ARM: iop3xx: use fixed PCI i/o mapping 
Move iop33x and iop32x PCI to fixed i/o mapping and remove io.h. This
changes the PCI bus addresses from the cpu address to 0 based. It appears
that there is translation h/w for this, but its untested.

Not sure what to do with io_offset. I think it should always be 0.
AFAICT, PCI setup is skipped if the ATU is already setup.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
2012-07-26 09:10:04 -05:00

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/*
* arch/arm/plat-iop/pci.c
*
* PCI support for the Intel IOP32X and IOP33X processors
*
* Author: Rory Bolt <rorybolt@pacbell.net>
* Copyright (C) 2002 Rory Bolt
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/io.h>
#include <asm/irq.h>
#include <asm/signal.h>
#include <mach/hardware.h>
#include <asm/mach/pci.h>
#include <asm/hardware/iop3xx.h>
// #define DEBUG
#ifdef DEBUG
#define DBG(x...) printk(x)
#else
#define DBG(x...) do { } while (0)
#endif
/*
* This routine builds either a type0 or type1 configuration command. If the
* bus is on the 803xx then a type0 made, else a type1 is created.
*/
static u32 iop3xx_cfg_address(struct pci_bus *bus, int devfn, int where)
{
struct pci_sys_data *sys = bus->sysdata;
u32 addr;
if (sys->busnr == bus->number)
addr = 1 << (PCI_SLOT(devfn) + 16) | (PCI_SLOT(devfn) << 11);
else
addr = bus->number << 16 | PCI_SLOT(devfn) << 11 | 1;
addr |= PCI_FUNC(devfn) << 8 | (where & ~3);
return addr;
}
/*
* This routine checks the status of the last configuration cycle. If an error
* was detected it returns a 1, else it returns a 0. The errors being checked
* are parity, master abort, target abort (master and target). These types of
* errors occur during a config cycle where there is no device, like during
* the discovery stage.
*/
static int iop3xx_pci_status(void)
{
unsigned int status;
int ret = 0;
/*
* Check the status registers.
*/
status = *IOP3XX_ATUSR;
if (status & 0xf900) {
DBG("\t\t\tPCI: P0 - status = 0x%08x\n", status);
*IOP3XX_ATUSR = status & 0xf900;
ret = 1;
}
status = *IOP3XX_ATUISR;
if (status & 0x679f) {
DBG("\t\t\tPCI: P1 - status = 0x%08x\n", status);
*IOP3XX_ATUISR = status & 0x679f;
ret = 1;
}
return ret;
}
/*
* Simply write the address register and read the configuration
* data. Note that the 4 nops ensure that we are able to handle
* a delayed abort (in theory.)
*/
static u32 iop3xx_read(unsigned long addr)
{
u32 val;
__asm__ __volatile__(
"str %1, [%2]\n\t"
"ldr %0, [%3]\n\t"
"nop\n\t"
"nop\n\t"
"nop\n\t"
"nop\n\t"
: "=r" (val)
: "r" (addr), "r" (IOP3XX_OCCAR), "r" (IOP3XX_OCCDR));
return val;
}
/*
* The read routines must check the error status of the last configuration
* cycle. If there was an error, the routine returns all hex f's.
*/
static int
iop3xx_read_config(struct pci_bus *bus, unsigned int devfn, int where,
int size, u32 *value)
{
unsigned long addr = iop3xx_cfg_address(bus, devfn, where);
u32 val = iop3xx_read(addr) >> ((where & 3) * 8);
if (iop3xx_pci_status())
val = 0xffffffff;
*value = val;
return PCIBIOS_SUCCESSFUL;
}
static int
iop3xx_write_config(struct pci_bus *bus, unsigned int devfn, int where,
int size, u32 value)
{
unsigned long addr = iop3xx_cfg_address(bus, devfn, where);
u32 val;
if (size != 4) {
val = iop3xx_read(addr);
if (iop3xx_pci_status())
return PCIBIOS_SUCCESSFUL;
where = (where & 3) * 8;
if (size == 1)
val &= ~(0xff << where);
else
val &= ~(0xffff << where);
*IOP3XX_OCCDR = val | value << where;
} else {
asm volatile(
"str %1, [%2]\n\t"
"str %0, [%3]\n\t"
"nop\n\t"
"nop\n\t"
"nop\n\t"
"nop\n\t"
:
: "r" (value), "r" (addr),
"r" (IOP3XX_OCCAR), "r" (IOP3XX_OCCDR));
}
return PCIBIOS_SUCCESSFUL;
}
struct pci_ops iop3xx_ops = {
.read = iop3xx_read_config,
.write = iop3xx_write_config,
};
/*
* When a PCI device does not exist during config cycles, the 80200 gets a
* bus error instead of returning 0xffffffff. This handler simply returns.
*/
static int
iop3xx_pci_abort(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
{
DBG("PCI abort: address = 0x%08lx fsr = 0x%03x PC = 0x%08lx LR = 0x%08lx\n",
addr, fsr, regs->ARM_pc, regs->ARM_lr);
/*
* If it was an imprecise abort, then we need to correct the
* return address to be _after_ the instruction.
*/
if (fsr & (1 << 10))
regs->ARM_pc += 4;
return 0;
}
int iop3xx_pci_setup(int nr, struct pci_sys_data *sys)
{
struct resource *res;
if (nr != 0)
return 0;
res = kzalloc(sizeof(struct resource), GFP_KERNEL);
if (!res)
panic("PCI: unable to alloc resources");
res->start = IOP3XX_PCI_LOWER_MEM_PA;
res->end = IOP3XX_PCI_LOWER_MEM_PA + IOP3XX_PCI_MEM_WINDOW_SIZE - 1;
res->name = "IOP3XX PCI Memory Space";
res->flags = IORESOURCE_MEM;
request_resource(&iomem_resource, res);
/*
* Use whatever translation is already setup.
*/
sys->mem_offset = IOP3XX_PCI_LOWER_MEM_PA - *IOP3XX_OMWTVR0;
pci_add_resource_offset(&sys->resources, res, sys->mem_offset);
pci_ioremap_io(0, IOP3XX_PCI_LOWER_IO_PA);
return 1;
}
void __init iop3xx_atu_setup(void)
{
/* BAR 0 ( Disabled ) */
*IOP3XX_IAUBAR0 = 0x0;
*IOP3XX_IABAR0 = 0x0;
*IOP3XX_IATVR0 = 0x0;
*IOP3XX_IALR0 = 0x0;
/* BAR 1 ( Disabled ) */
*IOP3XX_IAUBAR1 = 0x0;
*IOP3XX_IABAR1 = 0x0;
*IOP3XX_IALR1 = 0x0;
/* BAR 2 (1:1 mapping with Physical RAM) */
/* Set limit and enable */
*IOP3XX_IALR2 = ~((u32)IOP3XX_MAX_RAM_SIZE - 1) & ~0x1;
*IOP3XX_IAUBAR2 = 0x0;
/* Align the inbound bar with the base of memory */
*IOP3XX_IABAR2 = PHYS_OFFSET |
PCI_BASE_ADDRESS_MEM_TYPE_64 |
PCI_BASE_ADDRESS_MEM_PREFETCH;
*IOP3XX_IATVR2 = PHYS_OFFSET;
/* Outbound window 0 */
*IOP3XX_OMWTVR0 = IOP3XX_PCI_LOWER_MEM_BA;
*IOP3XX_OUMWTVR0 = 0;
/* Outbound window 1 */
*IOP3XX_OMWTVR1 = IOP3XX_PCI_LOWER_MEM_BA +
IOP3XX_PCI_MEM_WINDOW_SIZE / 2;
*IOP3XX_OUMWTVR1 = 0;
/* BAR 3 ( Disabled ) */
*IOP3XX_IAUBAR3 = 0x0;
*IOP3XX_IABAR3 = 0x0;
*IOP3XX_IATVR3 = 0x0;
*IOP3XX_IALR3 = 0x0;
/* Setup the I/O Bar
*/
*IOP3XX_OIOWTVR = IOP3XX_PCI_LOWER_IO_BA;
/* Enable inbound and outbound cycles
*/
*IOP3XX_ATUCMD |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
PCI_COMMAND_PARITY | PCI_COMMAND_SERR;
*IOP3XX_ATUCR |= IOP3XX_ATUCR_OUT_EN;
}
void __init iop3xx_atu_disable(void)
{
*IOP3XX_ATUCMD = 0;
*IOP3XX_ATUCR = 0;
/* wait for cycles to quiesce */
while (*IOP3XX_PCSR & (IOP3XX_PCSR_OUT_Q_BUSY |
IOP3XX_PCSR_IN_Q_BUSY))
cpu_relax();
/* BAR 0 ( Disabled ) */
*IOP3XX_IAUBAR0 = 0x0;
*IOP3XX_IABAR0 = 0x0;
*IOP3XX_IATVR0 = 0x0;
*IOP3XX_IALR0 = 0x0;
/* BAR 1 ( Disabled ) */
*IOP3XX_IAUBAR1 = 0x0;
*IOP3XX_IABAR1 = 0x0;
*IOP3XX_IALR1 = 0x0;
/* BAR 2 ( Disabled ) */
*IOP3XX_IAUBAR2 = 0x0;
*IOP3XX_IABAR2 = 0x0;
*IOP3XX_IATVR2 = 0x0;
*IOP3XX_IALR2 = 0x0;
/* BAR 3 ( Disabled ) */
*IOP3XX_IAUBAR3 = 0x0;
*IOP3XX_IABAR3 = 0x0;
*IOP3XX_IATVR3 = 0x0;
*IOP3XX_IALR3 = 0x0;
/* Clear the outbound windows */
*IOP3XX_OIOWTVR = 0;
/* Outbound window 0 */
*IOP3XX_OMWTVR0 = 0;
*IOP3XX_OUMWTVR0 = 0;
/* Outbound window 1 */
*IOP3XX_OMWTVR1 = 0;
*IOP3XX_OUMWTVR1 = 0;
}
/* Flag to determine whether the ATU is initialized and the PCI bus scanned */
int init_atu;
int iop3xx_get_init_atu(void) {
/* check if default has been overridden */
if (init_atu != IOP3XX_INIT_ATU_DEFAULT)
return init_atu;
else
return IOP3XX_INIT_ATU_DISABLE;
}
static void __init iop3xx_atu_debug(void)
{
DBG("PCI: Intel IOP3xx PCI init.\n");
DBG("PCI: Outbound memory window 0: PCI 0x%08x%08x\n",
*IOP3XX_OUMWTVR0, *IOP3XX_OMWTVR0);
DBG("PCI: Outbound memory window 1: PCI 0x%08x%08x\n",
*IOP3XX_OUMWTVR1, *IOP3XX_OMWTVR1);
DBG("PCI: Outbound IO window: PCI 0x%08x\n",
*IOP3XX_OIOWTVR);
DBG("PCI: Inbound memory window 0: PCI 0x%08x%08x 0x%08x -> 0x%08x\n",
*IOP3XX_IAUBAR0, *IOP3XX_IABAR0, *IOP3XX_IALR0, *IOP3XX_IATVR0);
DBG("PCI: Inbound memory window 1: PCI 0x%08x%08x 0x%08x\n",
*IOP3XX_IAUBAR1, *IOP3XX_IABAR1, *IOP3XX_IALR1);
DBG("PCI: Inbound memory window 2: PCI 0x%08x%08x 0x%08x -> 0x%08x\n",
*IOP3XX_IAUBAR2, *IOP3XX_IABAR2, *IOP3XX_IALR2, *IOP3XX_IATVR2);
DBG("PCI: Inbound memory window 3: PCI 0x%08x%08x 0x%08x -> 0x%08x\n",
*IOP3XX_IAUBAR3, *IOP3XX_IABAR3, *IOP3XX_IALR3, *IOP3XX_IATVR3);
DBG("PCI: Expansion ROM window: PCI 0x%08x%08x 0x%08x -> 0x%08x\n",
0, *IOP3XX_ERBAR, *IOP3XX_ERLR, *IOP3XX_ERTVR);
DBG("ATU: IOP3XX_ATUCMD=0x%04x\n", *IOP3XX_ATUCMD);
DBG("ATU: IOP3XX_ATUCR=0x%08x\n", *IOP3XX_ATUCR);
hook_fault_code(16+6, iop3xx_pci_abort, SIGBUS, 0, "imprecise external abort");
}
/* for platforms that might be host-bus-adapters */
void __init iop3xx_pci_preinit_cond(void)
{
if (iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE) {
iop3xx_atu_disable();
iop3xx_atu_setup();
iop3xx_atu_debug();
}
}
void __init iop3xx_pci_preinit(void)
{
pcibios_min_mem = 0;
iop3xx_atu_disable();
iop3xx_atu_setup();
iop3xx_atu_debug();
}
/* allow init_atu to be user overridden */
static int __init iop3xx_init_atu_setup(char *str)
{
init_atu = IOP3XX_INIT_ATU_DEFAULT;
if (str) {
while (*str != '\0') {
switch (*str) {
case 'y':
case 'Y':
init_atu = IOP3XX_INIT_ATU_ENABLE;
break;
case 'n':
case 'N':
init_atu = IOP3XX_INIT_ATU_DISABLE;
break;
case ',':
case '=':
break;
default:
printk(KERN_DEBUG "\"%s\" malformed at "
"character: \'%c\'",
__func__,
*str);
*(str + 1) = '\0';
}
str++;
}
}
return 1;
}
__setup("iop3xx_init_atu", iop3xx_init_atu_setup);
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