+++ /dev/null
-/*
- * 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 <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
- || dev->device == PCI_DEVICE_ID_MOTOROLA_MPC5200B) ) {
- 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");
-
-}
git.samba.org / sfrench / cifs-2.6.git / blobdiff