arch/ppc/syslib/mpc52xx_pci.c - kernel/msm-4.9 - Gitiles

 /*
  * 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
 	      || 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");

 }
	/*
	* 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
	\|\| 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");

	}