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kernel-ark/arch/arm/mach-versatile/pci.c
Catalin Marinas c0da085ad2 [PATCH] ARM: 2693/1: Add PCI support for Versatile/PB 
Patch from Catalin Marinas

This patch adds PCI support for the Versatile PB926 platform.

Signed-off-by: Colin King
Signed-off-by: Catalin Marinas
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-06-20 18:51:06 +01:00

361 lines
8.3 KiB
C
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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/config.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/init.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/mach/pci.h>
#include <asm/mach-types.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 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 unsigned long __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)
{
unsigned long addr = __pci_addr(bus, devfn, where);
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:
addr &= ~3;
v = __raw_readb(addr);
break;
case 2:
v = __raw_readl(addr & ~3);
if (addr & 2) v >>= 16;
v &= 0xffff;
break;
default:
addr &= ~3;
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)
{
unsigned long 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_mem = {
.name = "PCI I/O space",
.start = VERSATILE_PCI_MEM_BASE0,
.end = VERSATILE_PCI_MEM_BASE0+VERSATILE_PCI_MEM_BASE0_SIZE-1,
.flags = IORESOURCE_IO,
};
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 resource **resource)
{
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(&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;
}
/*
* bus->resource[0] is the IO resource for this bus
* bus->resource[1] is the mem resource for this bus
* bus->resource[2] is the prefetch mem resource for this bus
*/
resource[0] = &io_mem;
resource[1] = &non_mem;
resource[2] = &pre_mem;
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;
if (nr == 0) {
sys->mem_offset = 0;
ret = pci_versatile_setup_resources(sys->resource);
if (ret < 0) {
printk("pci_versatile_setup: resources... oops?\n");
goto out;
}
} else {
printk("pci_versatile_setup: resources... nr == 0??\n");
goto out;
}
__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(1, SYS_PCICTL);
val = __raw_readl(SYS_PCICTL);
if (!(val & 1)) {
printk("Not plugged into PCI backplane!\n");
ret = -EIO;
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;
__raw_writel(myslot, PCI_SELFID);
val = __raw_readl(VERSATILE_PCI_CFG_VIRT_BASE+(myslot<<11)+CSR_OFFSET);
val |= (1<<2);
__raw_writel(val, VERSATILE_PCI_CFG_VIRT_BASE+(myslot<<11)+CSR_OFFSET);
break;
}
}
if (myslot == -1) {
printk("Cannot find PCI core!\n");
ret = -EIO;
} else {
printk("PCI core found (slot %d)\n",myslot);
/* Do not to map Versatile FPGA PCI device
into memory space as we are short of
mappable memory */
pci_slot_ignore |= (1 << myslot);
ret = 1;
}
out:
return ret;
}
struct pci_bus *pci_versatile_scan_bus(int nr, struct pci_sys_data *sys)
{
return pci_scan_bus(sys->busnr, &pci_versatile_ops, sys);
}
/*
* V3_LB_BASE? - local bus address
* V3_LB_MAP? - pci bus address
*/
void __init pci_versatile_preinit(void)
{
}
void __init pci_versatile_postinit(void)
{
}
/*
* map the specified device/slot/pin to an IRQ. Different backplanes may need to modify this.
*/
static int __init versatile_map_irq(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 untested
26 1 29
27 1 30 untested
*/
irq = 27 + ((slot + pin + 2) % 3); /* Fudged */
printk("map irq: slot %d, pin %d, devslot %d, irq: %d\n",slot,pin,devslot,irq);
return irq;
}
static struct hw_pci versatile_pci __initdata = {
.swizzle = NULL,
.map_irq = versatile_map_irq,
.nr_controllers = 1,
.setup = pci_versatile_setup,
.scan = pci_versatile_scan_bus,
.preinit = pci_versatile_preinit,
.postinit = pci_versatile_postinit,
};
static int __init versatile_pci_init(void)
{
pci_common_init(&versatile_pci);
return 0;
}
subsys_initcall(versatile_pci_init);
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