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/*
* PCI code for the Freescale MPC52xx embedded CPU.
*
*
* Maintainer : Sylvain Munaut <tnt@246tNt.com>
*
* Copyright (C) 2004 Sylvain Munaut <tnt@246tNt.com>
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*/
#include <linux/config.h>
#include <asm/pci.h>
#include <asm/mpc52xx.h>
#include "mpc52xx_pci.h"
#include <asm/delay.h>
#include <asm/machdep.h>
/* This macro is defined to activate the workaround for the bug
435 of the MPC5200 (L25R). With it activated, we don't do any
32 bits configuration access during type-1 cycles */
#define MPC5200_BUG_435_WORKAROUND
static int
mpc52xx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
int offset, int len, u32 *val)
{
struct pci_controller *hose = bus->sysdata;
u32 value;
if (ppc_md.pci_exclude_device)
if (ppc_md.pci_exclude_device(bus->number, devfn))
return PCIBIOS_DEVICE_NOT_FOUND;
out_be32(hose->cfg_addr,
(1 << 31) |
((bus->number - hose->bus_offset) << 16) |
(devfn << 8) |
(offset & 0xfc));
mb();
#ifdef MPC5200_BUG_435_WORKAROUND
if (bus->number != hose->bus_offset) {
switch (len) {
case 1:
value = in_8(((u8 __iomem *)hose->cfg_data) + (offset & 3));
break;
case 2:
value = in_le16(((u16 __iomem *)hose->cfg_data) + ((offset>>1) & 1));
break;
default:
value = in_le16((u16 __iomem *)hose->cfg_data) |
(in_le16(((u16 __iomem *)hose->cfg_data) + 1) << 16);
break;
}
}
else
#endif
{
value = in_le32(hose->cfg_data);
if (len != 4) {
value >>= ((offset & 0x3) << 3);
value &= 0xffffffff >> (32 - (len << 3));
}
}
*val = value;
out_be32(hose->cfg_addr, 0);
mb();
return PCIBIOS_SUCCESSFUL;
}
static int
mpc52xx_pci_write_config(struct pci_bus *bus, unsigned int devfn,
int offset, int len, u32 val)
{
struct pci_controller *hose = bus->sysdata;
u32 value, mask;
if (ppc_md.pci_exclude_device)
if (ppc_md.pci_exclude_device(bus->number, devfn))
return PCIBIOS_DEVICE_NOT_FOUND;
out_be32(hose->cfg_addr,
(1 << 31) |
((bus->number - hose->bus_offset) << 16) |
(devfn << 8) |
(offset & 0xfc));
mb();
#ifdef MPC5200_BUG_435_WORKAROUND
if (bus->number != hose->bus_offset) {
switch (len) {
case 1:
out_8(((u8 __iomem *)hose->cfg_data) +
(offset & 3), val);
break;
case 2:
out_le16(((u16 __iomem *)hose->cfg_data) +
((offset>>1) & 1), val);
break;
default:
out_le16((u16 __iomem *)hose->cfg_data,
(u16)val);
out_le16(((u16 __iomem *)hose->cfg_data) + 1,
(u16)(val>>16));
break;
}
}
else
#endif
{
if (len != 4) {
value = in_le32(hose->cfg_data);
offset = (offset & 0x3) << 3;
mask = (0xffffffff >> (32 - (len << 3)));
mask <<= offset;
value &= ~mask;
val = value | ((val << offset) & mask);
}
out_le32(hose->cfg_data, val);
}
mb();
out_be32(hose->cfg_addr, 0);
mb();
return PCIBIOS_SUCCESSFUL;
}
static struct pci_ops mpc52xx_pci_ops = {
.read = mpc52xx_pci_read_config,
.write = mpc52xx_pci_write_config
};
static void __init
mpc52xx_pci_setup(struct mpc52xx_pci __iomem *pci_regs)
{
u32 tmp;
/* Setup control regs */
tmp = in_be32(&pci_regs->scr);
tmp |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
out_be32(&pci_regs->scr, tmp);
/* Setup windows */
out_be32(&pci_regs->iw0btar, MPC52xx_PCI_IWBTAR_TRANSLATION(
MPC52xx_PCI_MEM_START + MPC52xx_PCI_MEM_OFFSET,
MPC52xx_PCI_MEM_START,
MPC52xx_PCI_MEM_SIZE ));
out_be32(&pci_regs->iw1btar, MPC52xx_PCI_IWBTAR_TRANSLATION(
MPC52xx_PCI_MMIO_START + MPC52xx_PCI_MEM_OFFSET,
MPC52xx_PCI_MMIO_START,
MPC52xx_PCI_MMIO_SIZE ));
out_be32(&pci_regs->iw2btar, MPC52xx_PCI_IWBTAR_TRANSLATION(
MPC52xx_PCI_IO_BASE,
MPC52xx_PCI_IO_START,
MPC52xx_PCI_IO_SIZE ));
out_be32(&pci_regs->iwcr, MPC52xx_PCI_IWCR_PACK(
( MPC52xx_PCI_IWCR_ENABLE | /* iw0btar */
MPC52xx_PCI_IWCR_READ_MULTI |
MPC52xx_PCI_IWCR_MEM ),
( MPC52xx_PCI_IWCR_ENABLE | /* iw1btar */
MPC52xx_PCI_IWCR_READ |
MPC52xx_PCI_IWCR_MEM ),
( MPC52xx_PCI_IWCR_ENABLE | /* iw2btar */
MPC52xx_PCI_IWCR_IO )
));
out_be32(&pci_regs->tbatr0,
MPC52xx_PCI_TBATR_ENABLE | MPC52xx_PCI_TARGET_IO );
out_be32(&pci_regs->tbatr1,
MPC52xx_PCI_TBATR_ENABLE | MPC52xx_PCI_TARGET_MEM );
out_be32(&pci_regs->tcr, MPC52xx_PCI_TCR_LD);
/* Reset the exteral bus ( internal PCI controller is NOT resetted ) */
/* Not necessary and can be a bad thing if for example the bootloader
is displaying a splash screen or ... Just left here for
documentation purpose if anyone need it */
tmp = in_be32(&pci_regs->gscr);
#if 0
out_be32(&pci_regs->gscr, tmp | MPC52xx_PCI_GSCR_PR);
udelay(50);
#endif
out_be32(&pci_regs->gscr, tmp & ~MPC52xx_PCI_GSCR_PR);
}
static void
mpc52xx_pci_fixup_resources(struct pci_dev *dev)
{
int i;
/* We don't rely on boot loader for PCI and resets all
devices */
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
struct resource *res = &dev->resource[i];
if (res->end > res->start) { /* Only valid resources */
res->end -= res->start;
res->start = 0;
res->flags |= IORESOURCE_UNSET;
}
}
/* The PCI Host bridge of MPC52xx has a prefetch memory resource
fixed to 1Gb. Doesn't fit in the resource system so we remove it */
if ( (dev->vendor == PCI_VENDOR_ID_MOTOROLA) &&
(dev->device == PCI_DEVICE_ID_MOTOROLA_MPC5200) ) {
struct resource *res = &dev->resource[1];
res->start = res->end = res->flags = 0;
}
}
void __init
mpc52xx_find_bridges(void)
{
struct mpc52xx_pci __iomem *pci_regs;
struct pci_controller *hose;
pci_assign_all_buses = 1;
pci_regs = ioremap(MPC52xx_PA(MPC52xx_PCI_OFFSET), MPC52xx_PCI_SIZE);
if (!pci_regs)
return;
hose = pcibios_alloc_controller();
if (!hose) {
iounmap(pci_regs);
return;
}
ppc_md.pci_swizzle = common_swizzle;
ppc_md.pcibios_fixup_resources = mpc52xx_pci_fixup_resources;
hose->first_busno = 0;
hose->last_busno = 0xff;
hose->bus_offset = 0;
hose->ops = &mpc52xx_pci_ops;
mpc52xx_pci_setup(pci_regs);
hose->pci_mem_offset = MPC52xx_PCI_MEM_OFFSET;
hose->io_base_virt = ioremap(MPC52xx_PCI_IO_BASE, MPC52xx_PCI_IO_SIZE);
isa_io_base = (unsigned long) hose->io_base_virt;
hose->cfg_addr = &pci_regs->car;
hose->cfg_data = hose->io_base_virt;
/* Setup resources */
pci_init_resource(&hose->mem_resources[0],
MPC52xx_PCI_MEM_START,
MPC52xx_PCI_MEM_STOP,
IORESOURCE_MEM|IORESOURCE_PREFETCH,
"PCI prefetchable memory");
pci_init_resource(&hose->mem_resources[1],
MPC52xx_PCI_MMIO_START,
MPC52xx_PCI_MMIO_STOP,
IORESOURCE_MEM,
"PCI memory");
pci_init_resource(&hose->io_resource,
MPC52xx_PCI_IO_START,
MPC52xx_PCI_IO_STOP,
IORESOURCE_IO,
"PCI I/O");
}
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