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linux/arch/arm/mach-versatile/pci.c
Arnd Bergmann 9b0f7e3992 arm: versatile: fix and enable PCI I/O space 
With commit 4d5fc58dbe (ARM: remove bunch of now unused
mach/io.h files), the I/O space setup was completely broken on
versatile. This patch fixes that and prepares for further
I/O space clean-up.

I/O space handling on the versatile platform is currently
broken in multiple ways. Most importantly, the ports do
not get mapped into the virtual address space at all.

Also, there is some amount of confusion between PCI I/O
space and other statically mapped MMIO registers in the
platform code:

* The __io_address() macro that is used to access the
  platform register maps to the same __io macro that gets
  used for I/O space.

* The IO_SPACE_LIMIT is set to a value that is much larger
  than the total available space.

* The I/O resource of the PCI bus is set to the physical
  address of the mapping, which is way outside of the
  actual I/O space limit as well as the address range that
  gets decoded by traditional PCI cards.

* No attempt is made to stay outside of the ISA port range
  that some device drivers try access.

* No resource gets requested as a child of ioport_resource,
  but an IORESOURCE_IO type mapping gets requested
  as a child of iomem_resource.

This patch attempts to correct all of the above. This makes
it possible to use virtio-pci based virtual devices as well
as actual PCI cards including those with legacy ISA port
ranges like VGA.

Some of the issues seem to be duplicated on other platforms.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
[rob: update to 3.5-rc2 and io.h cleanup related changes]
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Tested-by: Robert Schwebel <r.schwebel@pengutronix.de>
Signed-off-by: Olof Johansson <olof@lixom.net>
2012-06-16 18:41:35 -07:00

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/*
* linux/arch/arm/mach-versatile/pci.c
*
* (C) Copyright Koninklijke Philips Electronics NV 2004. All rights reserved.
* You can redistribute and/or modify this software under the terms of version 2
* of the GNU General Public License as published by the Free Software Foundation.
* THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED
* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
* Koninklijke Philips Electronics nor its subsidiaries is obligated to provide any support for this software.
*
* ARM Versatile PCI driver.
*
* 14/04/2005 Initial version, colin.king@philips.com
*
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/init.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <asm/irq.h>
#include <asm/mach/pci.h>
/*
* these spaces are mapped using the following base registers:
*
* Usage Local Bus Memory Base/Map registers used
*
* Mem 50000000 - 5FFFFFFF LB_BASE0/LB_MAP0, non prefetch
* Mem 60000000 - 6FFFFFFF LB_BASE1/LB_MAP1, prefetch
* IO 44000000 - 4FFFFFFF LB_BASE2/LB_MAP2, IO
* Cfg 42000000 - 42FFFFFF PCI config
*
*/
#define __IO_ADDRESS(n) ((void __iomem *)(unsigned long)IO_ADDRESS(n))
#define SYS_PCICTL __IO_ADDRESS(VERSATILE_SYS_PCICTL)
#define PCI_IMAP0 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x0)
#define PCI_IMAP1 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x4)
#define PCI_IMAP2 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x8)
#define PCI_SMAP0 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x10)
#define PCI_SMAP1 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x14)
#define PCI_SMAP2 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x18)
#define PCI_SELFID __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0xc)
#define DEVICE_ID_OFFSET 0x00
#define CSR_OFFSET 0x04
#define CLASS_ID_OFFSET 0x08
#define VP_PCI_DEVICE_ID 0x030010ee
#define VP_PCI_CLASS_ID 0x0b400000
static unsigned long pci_slot_ignore = 0;
static int __init versatile_pci_slot_ignore(char *str)
{
int retval;
int slot;
while ((retval = get_option(&str,&slot))) {
if ((slot < 0) || (slot > 31)) {
printk("Illegal slot value: %d\n",slot);
} else {
pci_slot_ignore |= (1 << slot);
}
}
return 1;
}
__setup("pci_slot_ignore=", versatile_pci_slot_ignore);
static void __iomem *__pci_addr(struct pci_bus *bus,
unsigned int devfn, int offset)
{
unsigned int busnr = bus->number;
/*
* Trap out illegal values
*/
if (offset > 255)
BUG();
if (busnr > 255)
BUG();
if (devfn > 255)
BUG();
return VERSATILE_PCI_CFG_VIRT_BASE + ((busnr << 16) |
(PCI_SLOT(devfn) << 11) | (PCI_FUNC(devfn) << 8) | offset);
}
static int versatile_read_config(struct pci_bus *bus, unsigned int devfn, int where,
int size, u32 *val)
{
void __iomem *addr = __pci_addr(bus, devfn, where & ~3);
u32 v;
int slot = PCI_SLOT(devfn);
if (pci_slot_ignore & (1 << slot)) {
/* Ignore this slot */
switch (size) {
case 1:
v = 0xff;
break;
case 2:
v = 0xffff;
break;
default:
v = 0xffffffff;
}
} else {
switch (size) {
case 1:
v = __raw_readl(addr);
if (where & 2) v >>= 16;
if (where & 1) v >>= 8;
v &= 0xff;
break;
case 2:
v = __raw_readl(addr);
if (where & 2) v >>= 16;
v &= 0xffff;
break;
default:
v = __raw_readl(addr);
break;
}
}
*val = v;
return PCIBIOS_SUCCESSFUL;
}
static int versatile_write_config(struct pci_bus *bus, unsigned int devfn, int where,
int size, u32 val)
{
void __iomem *addr = __pci_addr(bus, devfn, where);
int slot = PCI_SLOT(devfn);
if (pci_slot_ignore & (1 << slot)) {
return PCIBIOS_SUCCESSFUL;
}
switch (size) {
case 1:
__raw_writeb((u8)val, addr);
break;
case 2:
__raw_writew((u16)val, addr);
break;
case 4:
__raw_writel(val, addr);
break;
}
return PCIBIOS_SUCCESSFUL;
}
static struct pci_ops pci_versatile_ops = {
.read = versatile_read_config,
.write = versatile_write_config,
};
static struct resource io_port = {
.name = "PCI",
.start = 0,
.end = IO_SPACE_LIMIT,
.flags = IORESOURCE_IO,
};
static struct resource io_mem = {
.name = "PCI I/O space",
.start = VERSATILE_PCI_MEM_BASE0,
.end = VERSATILE_PCI_MEM_BASE0+VERSATILE_PCI_MEM_BASE0_SIZE-1,
.flags = IORESOURCE_MEM,
};
static struct resource non_mem = {
.name = "PCI non-prefetchable",
.start = VERSATILE_PCI_MEM_BASE1,
.end = VERSATILE_PCI_MEM_BASE1+VERSATILE_PCI_MEM_BASE1_SIZE-1,
.flags = IORESOURCE_MEM,
};
static struct resource pre_mem = {
.name = "PCI prefetchable",
.start = VERSATILE_PCI_MEM_BASE2,
.end = VERSATILE_PCI_MEM_BASE2+VERSATILE_PCI_MEM_BASE2_SIZE-1,
.flags = IORESOURCE_MEM | IORESOURCE_PREFETCH,
};
static int __init pci_versatile_setup_resources(struct pci_sys_data *sys)
{
int ret = 0;
ret = request_resource(&iomem_resource, &io_mem);
if (ret) {
printk(KERN_ERR "PCI: unable to allocate I/O "
"memory region (%d)\n", ret);
goto out;
}
ret = request_resource(&ioport_resource, &io_port);
if (ret) {
printk(KERN_ERR "PCI: unable to allocate I/O "
"port region (%d)\n", ret);
goto out;
}
ret = request_resource(&iomem_resource, &non_mem);
if (ret) {
printk(KERN_ERR "PCI: unable to allocate non-prefetchable "
"memory region (%d)\n", ret);
goto release_io_mem;
}
ret = request_resource(&iomem_resource, &pre_mem);
if (ret) {
printk(KERN_ERR "PCI: unable to allocate prefetchable "
"memory region (%d)\n", ret);
goto release_non_mem;
}
/*
* the IO resource for this bus
* the mem resource for this bus
* the prefetch mem resource for this bus
*/
pci_add_resource_offset(&sys->resources, &io_port, sys->io_offset);
pci_add_resource_offset(&sys->resources, &non_mem, sys->mem_offset);
pci_add_resource_offset(&sys->resources, &pre_mem, sys->mem_offset);
goto out;
release_non_mem:
release_resource(&non_mem);
release_io_mem:
release_resource(&io_mem);
out:
return ret;
}
int __init pci_versatile_setup(int nr, struct pci_sys_data *sys)
{
int ret = 0;
int i;
int myslot = -1;
unsigned long val;
void __iomem *local_pci_cfg_base;
val = __raw_readl(SYS_PCICTL);
if (!(val & 1)) {
printk("Not plugged into PCI backplane!\n");
ret = -EIO;
goto out;
}
if (nr == 0) {
sys->mem_offset = 0;
sys->io_offset = 0;
ret = pci_versatile_setup_resources(sys);
if (ret < 0) {
printk("pci_versatile_setup: resources... oops?\n");
goto out;
}
} else {
printk("pci_versatile_setup: resources... nr == 0??\n");
goto out;
}
/*
* We need to discover the PCI core first to configure itself
* before the main PCI probing is performed
*/
for (i=0; i<32; i++)
if ((__raw_readl(VERSATILE_PCI_VIRT_BASE+(i<<11)+DEVICE_ID_OFFSET) == VP_PCI_DEVICE_ID) &&
(__raw_readl(VERSATILE_PCI_VIRT_BASE+(i<<11)+CLASS_ID_OFFSET) == VP_PCI_CLASS_ID)) {
myslot = i;
break;
}
if (myslot == -1) {
printk("Cannot find PCI core!\n");
ret = -EIO;
goto out;
}
printk("PCI core found (slot %d)\n",myslot);
__raw_writel(myslot, PCI_SELFID);
local_pci_cfg_base = VERSATILE_PCI_CFG_VIRT_BASE + (myslot << 11);
val = __raw_readl(local_pci_cfg_base + CSR_OFFSET);
val |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE;
__raw_writel(val, local_pci_cfg_base + CSR_OFFSET);
/*
* Configure the PCI inbound memory windows to be 1:1 mapped to SDRAM
*/
__raw_writel(PHYS_OFFSET, local_pci_cfg_base + PCI_BASE_ADDRESS_0);
__raw_writel(PHYS_OFFSET, local_pci_cfg_base + PCI_BASE_ADDRESS_1);
__raw_writel(PHYS_OFFSET, local_pci_cfg_base + PCI_BASE_ADDRESS_2);
/*
* Do not to map Versatile FPGA PCI device into memory space
*/
pci_slot_ignore |= (1 << myslot);
ret = 1;
out:
return ret;
}
void __init pci_versatile_preinit(void)
{
pcibios_min_io = 0x44000000;
pcibios_min_mem = 0x50000000;
__raw_writel(VERSATILE_PCI_MEM_BASE0 >> 28, PCI_IMAP0);
__raw_writel(VERSATILE_PCI_MEM_BASE1 >> 28, PCI_IMAP1);
__raw_writel(VERSATILE_PCI_MEM_BASE2 >> 28, PCI_IMAP2);
__raw_writel(PHYS_OFFSET >> 28, PCI_SMAP0);
__raw_writel(PHYS_OFFSET >> 28, PCI_SMAP1);
__raw_writel(PHYS_OFFSET >> 28, PCI_SMAP2);
__raw_writel(1, SYS_PCICTL);
}
/*
* map the specified device/slot/pin to an IRQ. Different backplanes may need to modify this.
*/
static int __init versatile_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
int irq;
int devslot = PCI_SLOT(dev->devfn);
/* slot, pin, irq
* 24 1 27
* 25 1 28
* 26 1 29
* 27 1 30
*/
irq = 27 + ((slot - 24 + pin - 1) & 3);
return irq;
}
static struct hw_pci versatile_pci __initdata = {
.map_irq = versatile_map_irq,
.nr_controllers = 1,
.ops = &pci_versatile_ops,
.setup = pci_versatile_setup,
.preinit = pci_versatile_preinit,
};
static int __init versatile_pci_init(void)
{
pci_common_init(&versatile_pci);
return 0;
}
subsys_initcall(versatile_pci_init);
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