arch/sh/drivers/pci/pci-sh7780.c - kernel/skids - Git at Google

 /*
  * Low-Level PCI Support for the SH7780
  *
  *  Copyright (C) 2005 - 2010  Paul Mundt
  *
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  */
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/pci.h>
 #include <linux/interrupt.h>
 #include <linux/timer.h>
 #include <linux/irq.h>
 #include <linux/errno.h>
 #include <linux/delay.h>
 #include <linux/log2.h>
 #include "pci-sh4.h"
 #include <asm/mmu.h>
 #include <asm/sizes.h>

 static struct resource sh7785_pci_resources[] = {
 	{
 		.name	= "PCI IO",
 		.start	= 0x1000,
 		.end	= SZ_4M - 1,
 		.flags	= IORESOURCE_IO,
 	}, {
 		.name	= "PCI MEM 0",
 		.start	= 0xfd000000,
 		.end	= 0xfd000000 + SZ_16M - 1,
 		.flags	= IORESOURCE_MEM,
 	}, {
 		.name	= "PCI MEM 1",
 		.start	= 0x10000000,
 		.end	= 0x10000000 + SZ_64M - 1,
 		.flags	= IORESOURCE_MEM,
 	}, {
 		/*
 		 * 32-bit only resources must be last.
 		 */
 		.name	= "PCI MEM 2",
 		.start	= 0xc0000000,
 		.end	= 0xc0000000 + SZ_512M - 1,
 		.flags	= IORESOURCE_MEM | IORESOURCE_MEM_32BIT,
 	},
 };

 static struct pci_channel sh7780_pci_controller = {
 	.pci_ops	= &sh4_pci_ops,
 	.resources	= sh7785_pci_resources,
 	.nr_resources	= ARRAY_SIZE(sh7785_pci_resources),
 	.io_offset	= 0,
 	.mem_offset	= 0,
 	.io_map_base	= 0xfe200000,
 	.serr_irq	= evt2irq(0xa00),
 	.err_irq	= evt2irq(0xaa0),
 };

 struct pci_errors {
 	unsigned int	mask;
 	const char	*str;
 } pci_arbiter_errors[] = {
 	{ SH4_PCIAINT_MBKN,	"master broken" },
 	{ SH4_PCIAINT_TBTO,	"target bus time out" },
 	{ SH4_PCIAINT_MBTO,	"master bus time out" },
 	{ SH4_PCIAINT_TABT,	"target abort" },
 	{ SH4_PCIAINT_MABT,	"master abort" },
 	{ SH4_PCIAINT_RDPE,	"read data parity error" },
 	{ SH4_PCIAINT_WDPE,	"write data parity error" },
 }, pci_interrupt_errors[] = {
 	{ SH4_PCIINT_MLCK,	"master lock error" },
 	{ SH4_PCIINT_TABT,	"target-target abort" },
 	{ SH4_PCIINT_TRET,	"target retry time out" },
 	{ SH4_PCIINT_MFDE,	"master function disable erorr" },
 	{ SH4_PCIINT_PRTY,	"address parity error" },
 	{ SH4_PCIINT_SERR,	"SERR" },
 	{ SH4_PCIINT_TWDP,	"data parity error for target write" },
 	{ SH4_PCIINT_TRDP,	"PERR detected for target read" },
 	{ SH4_PCIINT_MTABT,	"target abort for master" },
 	{ SH4_PCIINT_MMABT,	"master abort for master" },
 	{ SH4_PCIINT_MWPD,	"master write data parity error" },
 	{ SH4_PCIINT_MRPD,	"master read data parity error" },
 };

 static irqreturn_t sh7780_pci_err_irq(int irq, void *dev_id)
 {
 	struct pci_channel *hose = dev_id;
 	unsigned long addr;
 	unsigned int status;
 	unsigned int cmd;
 	int i;

 	addr = __raw_readl(hose->reg_base + SH4_PCIALR);

 	/*
 	 * Handle status errors.
 	 */
 	status = __raw_readw(hose->reg_base + PCI_STATUS);
 	if (status & (PCI_STATUS_PARITY |
 		      PCI_STATUS_DETECTED_PARITY |
 		      PCI_STATUS_SIG_TARGET_ABORT |
 		      PCI_STATUS_REC_TARGET_ABORT |
 		      PCI_STATUS_REC_MASTER_ABORT)) {
 		cmd = pcibios_handle_status_errors(addr, status, hose);
 		if (likely(cmd))
 			__raw_writew(cmd, hose->reg_base + PCI_STATUS);
 	}

 	/*
 	 * Handle arbiter errors.
 	 */
 	status = __raw_readl(hose->reg_base + SH4_PCIAINT);
 	for (i = cmd = 0; i < ARRAY_SIZE(pci_arbiter_errors); i++) {
 		if (status & pci_arbiter_errors[i].mask) {
 			printk(KERN_DEBUG "PCI: %s, addr=%08lx\n",
 			       pci_arbiter_errors[i].str, addr);
 			cmd |= pci_arbiter_errors[i].mask;
 		}
 	}
 	__raw_writel(cmd, hose->reg_base + SH4_PCIAINT);

 	/*
 	 * Handle the remaining PCI errors.
 	 */
 	status = __raw_readl(hose->reg_base + SH4_PCIINT);
 	for (i = cmd = 0; i < ARRAY_SIZE(pci_interrupt_errors); i++) {
 		if (status & pci_interrupt_errors[i].mask) {
 			printk(KERN_DEBUG "PCI: %s, addr=%08lx\n",
 			       pci_interrupt_errors[i].str, addr);
 			cmd |= pci_interrupt_errors[i].mask;
 		}
 	}
 	__raw_writel(cmd, hose->reg_base + SH4_PCIINT);

 	return IRQ_HANDLED;
 }

 static irqreturn_t sh7780_pci_serr_irq(int irq, void *dev_id)
 {
 	struct pci_channel *hose = dev_id;

 	printk(KERN_DEBUG "PCI: system error received: ");
 	pcibios_report_status(PCI_STATUS_SIG_SYSTEM_ERROR, 1);
 	printk("\n");

 	/* Deassert SERR */
 	__raw_writel(SH4_PCIINTM_SDIM, hose->reg_base + SH4_PCIINTM);

 	/* Back off the IRQ for awhile */
 	disable_irq_nosync(irq);
 	hose->serr_timer.expires = jiffies + HZ;
 	add_timer(&hose->serr_timer);

 	return IRQ_HANDLED;
 }

 static int __init sh7780_pci_setup_irqs(struct pci_channel *hose)
 {
 	int ret;

 	/* Clear out PCI arbiter IRQs */
 	__raw_writel(0, hose->reg_base + SH4_PCIAINT);

 	/* Clear all error conditions */
 	__raw_writew(PCI_STATUS_DETECTED_PARITY  | \
 		     PCI_STATUS_SIG_SYSTEM_ERROR | \
 		     PCI_STATUS_REC_MASTER_ABORT | \
 		     PCI_STATUS_REC_TARGET_ABORT | \
 		     PCI_STATUS_SIG_TARGET_ABORT | \
 		     PCI_STATUS_PARITY, hose->reg_base + PCI_STATUS);

 	ret = request_irq(hose->serr_irq, sh7780_pci_serr_irq, IRQF_DISABLED,
 			  "PCI SERR interrupt", hose);
 	if (unlikely(ret)) {
 		printk(KERN_ERR "PCI: Failed hooking SERR IRQ\n");
 		return ret;
 	}

 	/*
 	 * The PCI ERR IRQ needs to be IRQF_SHARED since all of the power
 	 * down IRQ vectors are routed through the ERR IRQ vector. We
 	 * only request_irq() once as there is only a single masking
 	 * source for multiple events.
 	 */
 	ret = request_irq(hose->err_irq, sh7780_pci_err_irq, IRQF_SHARED,
 			  "PCI ERR interrupt", hose);
 	if (unlikely(ret)) {
 		free_irq(hose->serr_irq, hose);
 		return ret;
 	}

 	/* Unmask all of the arbiter IRQs. */
 	__raw_writel(SH4_PCIAINT_MBKN | SH4_PCIAINT_TBTO | SH4_PCIAINT_MBTO | \
 		     SH4_PCIAINT_TABT | SH4_PCIAINT_MABT | SH4_PCIAINT_RDPE | \
 		     SH4_PCIAINT_WDPE, hose->reg_base + SH4_PCIAINTM);

 	/* Unmask all of the PCI IRQs */
 	__raw_writel(SH4_PCIINTM_TTADIM  | SH4_PCIINTM_TMTOIM  | \
 		     SH4_PCIINTM_MDEIM   | SH4_PCIINTM_APEDIM  | \
 		     SH4_PCIINTM_SDIM    | SH4_PCIINTM_DPEITWM | \
 		     SH4_PCIINTM_PEDITRM | SH4_PCIINTM_TADIMM  | \
 		     SH4_PCIINTM_MADIMM  | SH4_PCIINTM_MWPDIM  | \
 		     SH4_PCIINTM_MRDPEIM, hose->reg_base + SH4_PCIINTM);

 	return ret;
 }

 static inline void __init sh7780_pci_teardown_irqs(struct pci_channel *hose)
 {
 	free_irq(hose->err_irq, hose);
 	free_irq(hose->serr_irq, hose);
 }

 static void __init sh7780_pci66_init(struct pci_channel *hose)
 {
 	unsigned int tmp;

 	if (!pci_is_66mhz_capable(hose, 0, 0))
 		return;

 	/* Enable register access */
 	tmp = __raw_readl(hose->reg_base + SH4_PCICR);
 	tmp |= SH4_PCICR_PREFIX;
 	__raw_writel(tmp, hose->reg_base + SH4_PCICR);

 	/* Enable 66MHz operation */
 	tmp = __raw_readw(hose->reg_base + PCI_STATUS);
 	tmp |= PCI_STATUS_66MHZ;
 	__raw_writew(tmp, hose->reg_base + PCI_STATUS);

 	/* Done */
 	tmp = __raw_readl(hose->reg_base + SH4_PCICR);
 	tmp |= SH4_PCICR_PREFIX | SH4_PCICR_CFIN;
 	__raw_writel(tmp, hose->reg_base + SH4_PCICR);
 }

 static int __init sh7780_pci_init(void)
 {
 	struct pci_channel *chan = &sh7780_pci_controller;
 	phys_addr_t memphys;
 	size_t memsize;
 	unsigned int id;
 	const char *type;
 	int ret, i;

 	printk(KERN_NOTICE "PCI: Starting intialization.\n");

 	chan->reg_base = 0xfe040000;

 	/* Enable CPU access to the PCIC registers. */
 	__raw_writel(PCIECR_ENBL, PCIECR);

 	/* Reset */
 	__raw_writel(SH4_PCICR_PREFIX | SH4_PCICR_PRST,
 		     chan->reg_base + SH4_PCICR);

 	/*
 	 * Wait for it to come back up. The spec says to allow for up to
 	 * 1 second after toggling the reset pin, but in practice 100ms
 	 * is more than enough.
 	 */
 	mdelay(100);

 	id = __raw_readw(chan->reg_base + PCI_VENDOR_ID);
 	if (id != PCI_VENDOR_ID_RENESAS) {
 		printk(KERN_ERR "PCI: Unknown vendor ID 0x%04x.\n", id);
 		return -ENODEV;
 	}

 	id = __raw_readw(chan->reg_base + PCI_DEVICE_ID);
 	type = (id == PCI_DEVICE_ID_RENESAS_SH7763) ? "SH7763" :
 	       (id == PCI_DEVICE_ID_RENESAS_SH7780) ? "SH7780" :
 	       (id == PCI_DEVICE_ID_RENESAS_SH7781) ? "SH7781" :
 	       (id == PCI_DEVICE_ID_RENESAS_SH7785) ? "SH7785" :
 					  NULL;
 	if (unlikely(!type)) {
 		printk(KERN_ERR "PCI: Found an unsupported Renesas host "
 		       "controller, device id 0x%04x.\n", id);
 		return -EINVAL;
 	}

 	printk(KERN_NOTICE "PCI: Found a Renesas %s host "
 	       "controller, revision %d.\n", type,
 	       __raw_readb(chan->reg_base + PCI_REVISION_ID));

 	/*
 	 * Now throw it in to register initialization mode and
 	 * start the real work.
 	 */
 	__raw_writel(SH4_PCICR_PREFIX, chan->reg_base + SH4_PCICR);

 	memphys = __pa(memory_start);
 	memsize = roundup_pow_of_two(memory_end - memory_start);

 	/*
 	 * If there's more than 512MB of memory, we need to roll over to
 	 * LAR1/LSR1.
 	 */
 	if (memsize > SZ_512M) {
 		__raw_writel(memphys + SZ_512M, chan->reg_base + SH4_PCILAR1);
 		__raw_writel((((memsize - SZ_512M) - SZ_1M) & 0x1ff00000) | 1,
 			     chan->reg_base + SH4_PCILSR1);
 		memsize = SZ_512M;
 	} else {
 		/*
 		 * Otherwise just zero it out and disable it.
 		 */
 		__raw_writel(0, chan->reg_base + SH4_PCILAR1);
 		__raw_writel(0, chan->reg_base + SH4_PCILSR1);
 	}

 	/*
 	 * LAR0/LSR0 covers up to the first 512MB, which is enough to
 	 * cover all of lowmem on most platforms.
 	 */
 	__raw_writel(memphys, chan->reg_base + SH4_PCILAR0);
 	__raw_writel(((memsize - SZ_1M) & 0x1ff00000) | 1,
 		     chan->reg_base + SH4_PCILSR0);

 	/*
 	 * Hook up the ERR and SERR IRQs.
 	 */
 	ret = sh7780_pci_setup_irqs(chan);
 	if (unlikely(ret))
 		return ret;

 	/*
 	 * Disable the cache snoop controller for non-coherent DMA.
 	 */
 	__raw_writel(0, chan->reg_base + SH7780_PCICSCR0);
 	__raw_writel(0, chan->reg_base + SH7780_PCICSAR0);
 	__raw_writel(0, chan->reg_base + SH7780_PCICSCR1);
 	__raw_writel(0, chan->reg_base + SH7780_PCICSAR1);

 	/*
 	 * Setup the memory BARs
 	 */
 	for (i = 1; i < chan->nr_resources; i++) {
 		struct resource *res = chan->resources + i;
 		resource_size_t size;

 		if (unlikely(res->flags & IORESOURCE_IO))
 			continue;

 		/*
 		 * Make sure we're in the right physical addressing mode
 		 * for dealing with the resource.
 		 */
 		if ((res->flags & IORESOURCE_MEM_32BIT) && __in_29bit_mode()) {
 			chan->nr_resources--;
 			continue;
 		}

 		size = resource_size(res);

 		/*
 		 * The MBMR mask is calculated in units of 256kB, which
 		 * keeps things pretty simple.
 		 */
 		__raw_writel(((roundup_pow_of_two(size) / SZ_256K) - 1) << 18,
 			     chan->reg_base + SH7780_PCIMBMR(i - 1));
 		__raw_writel(res->start, chan->reg_base + SH7780_PCIMBR(i - 1));
 	}

 	/*
 	 * And I/O.
 	 */
 	__raw_writel(0, chan->reg_base + PCI_BASE_ADDRESS_0);
 	__raw_writel(0, chan->reg_base + SH7780_PCIIOBR);
 	__raw_writel(0, chan->reg_base + SH7780_PCIIOBMR);

 	__raw_writew(PCI_COMMAND_SERR   | PCI_COMMAND_WAIT   | \
 		     PCI_COMMAND_PARITY | PCI_COMMAND_MASTER | \
 		     PCI_COMMAND_MEMORY, chan->reg_base + PCI_COMMAND);

 	/*
 	 * Initialization mode complete, release the control register and
 	 * enable round robin mode to stop device overruns/starvation.
 	 */
 	__raw_writel(SH4_PCICR_PREFIX | SH4_PCICR_CFIN | SH4_PCICR_FTO,
 		     chan->reg_base + SH4_PCICR);

 	ret = register_pci_controller(chan);
 	if (unlikely(ret))
 		goto err;

 	sh7780_pci66_init(chan);

 	printk(KERN_NOTICE "PCI: Running at %dMHz.\n",
 	       (__raw_readw(chan->reg_base + PCI_STATUS) & PCI_STATUS_66MHZ) ?
 	       66 : 33);

 	return 0;

 err:
 	sh7780_pci_teardown_irqs(chan);
 	return ret;
 }
 arch_initcall(sh7780_pci_init);
	/*
	* Low-Level PCI Support for the SH7780
	*
	* Copyright (C) 2005 - 2010 Paul Mundt
	*
	* This file is subject to the terms and conditions of the GNU General Public
	* License. See the file "COPYING" in the main directory of this archive
	* for more details.
	*/
	#include <linux/types.h>
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/pci.h>
	#include <linux/interrupt.h>
	#include <linux/timer.h>
	#include <linux/irq.h>
	#include <linux/errno.h>
	#include <linux/delay.h>
	#include <linux/log2.h>
	#include "pci-sh4.h"
	#include <asm/mmu.h>
	#include <asm/sizes.h>

	static struct resource sh7785_pci_resources[] = {
	{
	.name = "PCI IO",
	.start = 0x1000,
	.end = SZ_4M - 1,
	.flags = IORESOURCE_IO,
	}, {
	.name = "PCI MEM 0",
	.start = 0xfd000000,
	.end = 0xfd000000 + SZ_16M - 1,
	.flags = IORESOURCE_MEM,
	}, {
	.name = "PCI MEM 1",
	.start = 0x10000000,
	.end = 0x10000000 + SZ_64M - 1,
	.flags = IORESOURCE_MEM,
	}, {
	/*
	* 32-bit only resources must be last.
	*/
	.name = "PCI MEM 2",
	.start = 0xc0000000,
	.end = 0xc0000000 + SZ_512M - 1,
	.flags = IORESOURCE_MEM \| IORESOURCE_MEM_32BIT,
	},
	};

	static struct pci_channel sh7780_pci_controller = {
	.pci_ops = &sh4_pci_ops,
	.resources = sh7785_pci_resources,
	.nr_resources = ARRAY_SIZE(sh7785_pci_resources),
	.io_offset = 0,
	.mem_offset = 0,
	.io_map_base = 0xfe200000,
	.serr_irq = evt2irq(0xa00),
	.err_irq = evt2irq(0xaa0),
	};

	struct pci_errors {
	unsigned int mask;
	const char *str;
	} pci_arbiter_errors[] = {
	{ SH4_PCIAINT_MBKN, "master broken" },
	{ SH4_PCIAINT_TBTO, "target bus time out" },
	{ SH4_PCIAINT_MBTO, "master bus time out" },
	{ SH4_PCIAINT_TABT, "target abort" },
	{ SH4_PCIAINT_MABT, "master abort" },
	{ SH4_PCIAINT_RDPE, "read data parity error" },
	{ SH4_PCIAINT_WDPE, "write data parity error" },
	}, pci_interrupt_errors[] = {
	{ SH4_PCIINT_MLCK, "master lock error" },
	{ SH4_PCIINT_TABT, "target-target abort" },
	{ SH4_PCIINT_TRET, "target retry time out" },
	{ SH4_PCIINT_MFDE, "master function disable erorr" },
	{ SH4_PCIINT_PRTY, "address parity error" },
	{ SH4_PCIINT_SERR, "SERR" },
	{ SH4_PCIINT_TWDP, "data parity error for target write" },
	{ SH4_PCIINT_TRDP, "PERR detected for target read" },
	{ SH4_PCIINT_MTABT, "target abort for master" },
	{ SH4_PCIINT_MMABT, "master abort for master" },
	{ SH4_PCIINT_MWPD, "master write data parity error" },
	{ SH4_PCIINT_MRPD, "master read data parity error" },
	};

	static irqreturn_t sh7780_pci_err_irq(int irq, void *dev_id)
	{
	struct pci_channel *hose = dev_id;
	unsigned long addr;
	unsigned int status;
	unsigned int cmd;
	int i;

	addr = __raw_readl(hose->reg_base + SH4_PCIALR);

	/*
	* Handle status errors.
	*/
	status = __raw_readw(hose->reg_base + PCI_STATUS);
	if (status & (PCI_STATUS_PARITY \|
	PCI_STATUS_DETECTED_PARITY \|
	PCI_STATUS_SIG_TARGET_ABORT \|
	PCI_STATUS_REC_TARGET_ABORT \|
	PCI_STATUS_REC_MASTER_ABORT)) {
	cmd = pcibios_handle_status_errors(addr, status, hose);
	if (likely(cmd))
	__raw_writew(cmd, hose->reg_base + PCI_STATUS);
	}

	/*
	* Handle arbiter errors.
	*/
	status = __raw_readl(hose->reg_base + SH4_PCIAINT);
	for (i = cmd = 0; i < ARRAY_SIZE(pci_arbiter_errors); i++) {
	if (status & pci_arbiter_errors[i].mask) {
	printk(KERN_DEBUG "PCI: %s, addr=%08lx\n",
	pci_arbiter_errors[i].str, addr);
	cmd \|= pci_arbiter_errors[i].mask;
	}
	}
	__raw_writel(cmd, hose->reg_base + SH4_PCIAINT);

	/*
	* Handle the remaining PCI errors.
	*/
	status = __raw_readl(hose->reg_base + SH4_PCIINT);
	for (i = cmd = 0; i < ARRAY_SIZE(pci_interrupt_errors); i++) {
	if (status & pci_interrupt_errors[i].mask) {
	printk(KERN_DEBUG "PCI: %s, addr=%08lx\n",
	pci_interrupt_errors[i].str, addr);
	cmd \|= pci_interrupt_errors[i].mask;
	}
	}
	__raw_writel(cmd, hose->reg_base + SH4_PCIINT);

	return IRQ_HANDLED;
	}

	static irqreturn_t sh7780_pci_serr_irq(int irq, void *dev_id)
	{
	struct pci_channel *hose = dev_id;

	printk(KERN_DEBUG "PCI: system error received: ");
	pcibios_report_status(PCI_STATUS_SIG_SYSTEM_ERROR, 1);
	printk("\n");

	/* Deassert SERR */
	__raw_writel(SH4_PCIINTM_SDIM, hose->reg_base + SH4_PCIINTM);

	/* Back off the IRQ for awhile */
	disable_irq_nosync(irq);
	hose->serr_timer.expires = jiffies + HZ;
	add_timer(&hose->serr_timer);

	return IRQ_HANDLED;
	}

	static int __init sh7780_pci_setup_irqs(struct pci_channel *hose)
	{
	int ret;

	/* Clear out PCI arbiter IRQs */
	__raw_writel(0, hose->reg_base + SH4_PCIAINT);

	/* Clear all error conditions */
	__raw_writew(PCI_STATUS_DETECTED_PARITY \| \
	PCI_STATUS_SIG_SYSTEM_ERROR \| \
	PCI_STATUS_REC_MASTER_ABORT \| \
	PCI_STATUS_REC_TARGET_ABORT \| \
	PCI_STATUS_SIG_TARGET_ABORT \| \
	PCI_STATUS_PARITY, hose->reg_base + PCI_STATUS);

	ret = request_irq(hose->serr_irq, sh7780_pci_serr_irq, IRQF_DISABLED,
	"PCI SERR interrupt", hose);
	if (unlikely(ret)) {
	printk(KERN_ERR "PCI: Failed hooking SERR IRQ\n");
	return ret;
	}

	/*
	* The PCI ERR IRQ needs to be IRQF_SHARED since all of the power
	* down IRQ vectors are routed through the ERR IRQ vector. We
	* only request_irq() once as there is only a single masking
	* source for multiple events.
	*/
	ret = request_irq(hose->err_irq, sh7780_pci_err_irq, IRQF_SHARED,
	"PCI ERR interrupt", hose);
	if (unlikely(ret)) {
	free_irq(hose->serr_irq, hose);
	return ret;
	}

	/* Unmask all of the arbiter IRQs. */
	__raw_writel(SH4_PCIAINT_MBKN \| SH4_PCIAINT_TBTO \| SH4_PCIAINT_MBTO \| \
	SH4_PCIAINT_TABT \| SH4_PCIAINT_MABT \| SH4_PCIAINT_RDPE \| \
	SH4_PCIAINT_WDPE, hose->reg_base + SH4_PCIAINTM);

	/* Unmask all of the PCI IRQs */
	__raw_writel(SH4_PCIINTM_TTADIM \| SH4_PCIINTM_TMTOIM \| \
	SH4_PCIINTM_MDEIM \| SH4_PCIINTM_APEDIM \| \
	SH4_PCIINTM_SDIM \| SH4_PCIINTM_DPEITWM \| \
	SH4_PCIINTM_PEDITRM \| SH4_PCIINTM_TADIMM \| \
	SH4_PCIINTM_MADIMM \| SH4_PCIINTM_MWPDIM \| \
	SH4_PCIINTM_MRDPEIM, hose->reg_base + SH4_PCIINTM);

	return ret;
	}

	static inline void __init sh7780_pci_teardown_irqs(struct pci_channel *hose)
	{
	free_irq(hose->err_irq, hose);
	free_irq(hose->serr_irq, hose);
	}

	static void __init sh7780_pci66_init(struct pci_channel *hose)
	{
	unsigned int tmp;

	if (!pci_is_66mhz_capable(hose, 0, 0))
	return;

	/* Enable register access */
	tmp = __raw_readl(hose->reg_base + SH4_PCICR);
	tmp \|= SH4_PCICR_PREFIX;
	__raw_writel(tmp, hose->reg_base + SH4_PCICR);

	/* Enable 66MHz operation */
	tmp = __raw_readw(hose->reg_base + PCI_STATUS);
	tmp \|= PCI_STATUS_66MHZ;
	__raw_writew(tmp, hose->reg_base + PCI_STATUS);

	/* Done */
	tmp = __raw_readl(hose->reg_base + SH4_PCICR);
	tmp \|= SH4_PCICR_PREFIX \| SH4_PCICR_CFIN;
	__raw_writel(tmp, hose->reg_base + SH4_PCICR);
	}

	static int __init sh7780_pci_init(void)
	{
	struct pci_channel *chan = &sh7780_pci_controller;
	phys_addr_t memphys;
	size_t memsize;
	unsigned int id;
	const char *type;
	int ret, i;

	printk(KERN_NOTICE "PCI: Starting intialization.\n");

	chan->reg_base = 0xfe040000;

	/* Enable CPU access to the PCIC registers. */
	__raw_writel(PCIECR_ENBL, PCIECR);

	/* Reset */
	__raw_writel(SH4_PCICR_PREFIX \| SH4_PCICR_PRST,
	chan->reg_base + SH4_PCICR);

	/*
	* Wait for it to come back up. The spec says to allow for up to
	* 1 second after toggling the reset pin, but in practice 100ms
	* is more than enough.
	*/
	mdelay(100);

	id = __raw_readw(chan->reg_base + PCI_VENDOR_ID);
	if (id != PCI_VENDOR_ID_RENESAS) {
	printk(KERN_ERR "PCI: Unknown vendor ID 0x%04x.\n", id);
	return -ENODEV;
	}

	id = __raw_readw(chan->reg_base + PCI_DEVICE_ID);
	type = (id == PCI_DEVICE_ID_RENESAS_SH7763) ? "SH7763" :
	(id == PCI_DEVICE_ID_RENESAS_SH7780) ? "SH7780" :
	(id == PCI_DEVICE_ID_RENESAS_SH7781) ? "SH7781" :
	(id == PCI_DEVICE_ID_RENESAS_SH7785) ? "SH7785" :
	NULL;
	if (unlikely(!type)) {
	printk(KERN_ERR "PCI: Found an unsupported Renesas host "
	"controller, device id 0x%04x.\n", id);
	return -EINVAL;
	}

	printk(KERN_NOTICE "PCI: Found a Renesas %s host "
	"controller, revision %d.\n", type,
	__raw_readb(chan->reg_base + PCI_REVISION_ID));

	/*
	* Now throw it in to register initialization mode and
	* start the real work.
	*/
	__raw_writel(SH4_PCICR_PREFIX, chan->reg_base + SH4_PCICR);

	memphys = __pa(memory_start);
	memsize = roundup_pow_of_two(memory_end - memory_start);

	/*
	* If there's more than 512MB of memory, we need to roll over to
	* LAR1/LSR1.
	*/
	if (memsize > SZ_512M) {
	__raw_writel(memphys + SZ_512M, chan->reg_base + SH4_PCILAR1);
	__raw_writel((((memsize - SZ_512M) - SZ_1M) & 0x1ff00000) \| 1,
	chan->reg_base + SH4_PCILSR1);
	memsize = SZ_512M;
	} else {
	/*
	* Otherwise just zero it out and disable it.
	*/
	__raw_writel(0, chan->reg_base + SH4_PCILAR1);
	__raw_writel(0, chan->reg_base + SH4_PCILSR1);
	}

	/*
	* LAR0/LSR0 covers up to the first 512MB, which is enough to
	* cover all of lowmem on most platforms.
	*/
	__raw_writel(memphys, chan->reg_base + SH4_PCILAR0);
	__raw_writel(((memsize - SZ_1M) & 0x1ff00000) \| 1,
	chan->reg_base + SH4_PCILSR0);

	/*
	* Hook up the ERR and SERR IRQs.
	*/
	ret = sh7780_pci_setup_irqs(chan);
	if (unlikely(ret))
	return ret;

	/*
	* Disable the cache snoop controller for non-coherent DMA.
	*/
	__raw_writel(0, chan->reg_base + SH7780_PCICSCR0);
	__raw_writel(0, chan->reg_base + SH7780_PCICSAR0);
	__raw_writel(0, chan->reg_base + SH7780_PCICSCR1);
	__raw_writel(0, chan->reg_base + SH7780_PCICSAR1);

	/*
	* Setup the memory BARs
	*/
	for (i = 1; i < chan->nr_resources; i++) {
	struct resource *res = chan->resources + i;
	resource_size_t size;

	if (unlikely(res->flags & IORESOURCE_IO))
	continue;

	/*
	* Make sure we're in the right physical addressing mode
	* for dealing with the resource.
	*/
	if ((res->flags & IORESOURCE_MEM_32BIT) && __in_29bit_mode()) {
	chan->nr_resources--;
	continue;
	}

	size = resource_size(res);

	/*
	* The MBMR mask is calculated in units of 256kB, which
	* keeps things pretty simple.
	*/
	__raw_writel(((roundup_pow_of_two(size) / SZ_256K) - 1) << 18,
	chan->reg_base + SH7780_PCIMBMR(i - 1));
	__raw_writel(res->start, chan->reg_base + SH7780_PCIMBR(i - 1));
	}

	/*
	* And I/O.
	*/
	__raw_writel(0, chan->reg_base + PCI_BASE_ADDRESS_0);
	__raw_writel(0, chan->reg_base + SH7780_PCIIOBR);
	__raw_writel(0, chan->reg_base + SH7780_PCIIOBMR);

	__raw_writew(PCI_COMMAND_SERR \| PCI_COMMAND_WAIT \| \
	PCI_COMMAND_PARITY \| PCI_COMMAND_MASTER \| \
	PCI_COMMAND_MEMORY, chan->reg_base + PCI_COMMAND);

	/*
	* Initialization mode complete, release the control register and
	* enable round robin mode to stop device overruns/starvation.
	*/
	__raw_writel(SH4_PCICR_PREFIX \| SH4_PCICR_CFIN \| SH4_PCICR_FTO,
	chan->reg_base + SH4_PCICR);

	ret = register_pci_controller(chan);
	if (unlikely(ret))
	goto err;

	sh7780_pci66_init(chan);

	printk(KERN_NOTICE "PCI: Running at %dMHz.\n",
	(__raw_readw(chan->reg_base + PCI_STATUS) & PCI_STATUS_66MHZ) ?
	66 : 33);

	return 0;

	err:
	sh7780_pci_teardown_irqs(chan);
	return ret;
	}
	arch_initcall(sh7780_pci_init);