Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 66765fe1 authored by Paul Mundt's avatar Paul Mundt
Browse files

sh: pci: SH7786 PCI ops. 



This adds in preliminary support for the SH7786 PCIe module PCI ops,
and the corresponding module definitions.

Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 8c6b44d0

arch/sh/drivers/pci/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ obj-$(CONFIG_CPU_SUBTYPE_SH7751R) += pci-sh7751.o ops-sh4.o 
obj-$(CONFIG_CPU_SUBTYPE_SH7763)	+= pci-sh7780.o ops-sh4.o

obj-$(CONFIG_CPU_SUBTYPE_SH7780)	+= pci-sh7780.o ops-sh4.o

obj-$(CONFIG_CPU_SUBTYPE_SH7785)	+= pci-sh7780.o ops-sh4.o

obj-$(CONFIG_CPU_SUBTYPE_SH7786)	+= ops-sh7786.o

obj-$(CONFIG_CPU_SH5)			+= pci-sh5.o ops-sh5.o



obj-$(CONFIG_SH_DREAMCAST)		+= ops-dreamcast.o fixups-dreamcast.o \

arch/sh/drivers/pci/ops-sh7786.c

0 → 100644
+134 −0
Original line number Diff line number Diff line 
/*

 * Generic SH7786 PCI-Express operations.

 *

 *  Copyright (C) 2009  Paul Mundt

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License v2. See the file "COPYING" in the main directory of this archive

 * for more details.

 */

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/pci.h>

#include <linux/io.h>

#include <linux/spinlock.h>

#include "pcie-sh7786.h"



enum {

	PCI_ACCESS_READ,

	PCI_ACCESS_WRITE,

};



static DEFINE_SPINLOCK(sh7786_pcie_lock);



static int sh7786_pcie_config_access(unsigned char access_type,

		struct pci_bus *bus, unsigned int devfn, int where, u32 *data)

{

	struct pci_channel *chan = bus->sysdata;

	int dev, func;



	dev = PCI_SLOT(devfn);

	func = PCI_FUNC(devfn);



	if (bus->number > 255 || dev > 31 || func > 7)

		return PCIBIOS_FUNC_NOT_SUPPORTED;

	if (devfn)

		return PCIBIOS_DEVICE_NOT_FOUND;



	/* Set the PIO address */

	pci_write_reg(chan, (bus->number << 24) | (dev << 19) |

				(func << 16) | (where & ~3), SH4A_PCIEPAR);



	/* Enable the configuration access */

	pci_write_reg(chan, (1 << 31), SH4A_PCIEPCTLR);



	if (access_type == PCI_ACCESS_READ)

		*data = pci_read_reg(chan, SH4A_PCIEPDR);

	else

		pci_write_reg(chan, *data, SH4A_PCIEPDR);



	/* Check for master and target aborts */

	if (pci_read_reg(chan, SH4A_PCIEPCICONF1) & ((1 << 29) | (1 << 28)))

		return PCIBIOS_DEVICE_NOT_FOUND;



	return PCIBIOS_SUCCESSFUL;

}



static int sh7786_pcie_read(struct pci_bus *bus, unsigned int devfn,

			    int where, int size, u32 *val)

{

	unsigned long flags;

	int ret;

	u32 data;



        if ((size == 2) && (where & 1))

		return PCIBIOS_BAD_REGISTER_NUMBER;

	else if ((size == 4) && (where & 3))

		return PCIBIOS_BAD_REGISTER_NUMBER;



	spin_lock_irqsave(&sh7786_pcie_lock, flags);

	ret = sh7786_pcie_config_access(PCI_ACCESS_READ, bus,

					devfn, where, &data);

	if (ret != PCIBIOS_SUCCESSFUL)

		goto out;



	if (size == 1)

		*val = (data >> ((where & 3) << 3)) & 0xff;

	else if (size == 2)

		*val = (data >> ((where & 2) << 3)) & 0xffff;

	else

		*val = data;



	dev_dbg(&bus->dev, "pcie-config-read: bus=%3d devfn=0x%04x "

		"where=0x%04x size=%d val=0x%08lx\n", bus->number,

		devfn, where, size, (unsigned long)*val);



out:

	spin_unlock_irqrestore(&sh7786_pcie_lock, flags);

	return ret;

}



static int sh7786_pcie_write(struct pci_bus *bus, unsigned int devfn,

			     int where, int size, u32 val)

{

	unsigned long flags;

	int shift, ret;

	u32 data;



        if ((size == 2) && (where & 1))

		return PCIBIOS_BAD_REGISTER_NUMBER;

	else if ((size == 4) && (where & 3))

		return PCIBIOS_BAD_REGISTER_NUMBER;



	spin_lock_irqsave(&sh7786_pcie_lock, flags);

	ret = sh7786_pcie_config_access(PCI_ACCESS_READ, bus,

					devfn, where, &data);

	if (ret != PCIBIOS_SUCCESSFUL)

		goto out;



	dev_dbg(&bus->dev, "pcie-config-write: bus=%3d devfn=0x%04x "

		"where=0x%04x size=%d val=%08lx\n", bus->number,

		devfn, where, size, (unsigned long)val);



	if (size == 1) {

		shift = (where & 3) << 3;

		data &= ~(0xff << shift);

		data |= ((val & 0xff) << shift);

	} else if (size == 2) {

		shift = (where & 2) << 3;

		data &= ~(0xffff << shift);

		data |= ((val & 0xffff) << shift);

	} else

		data = val;



	ret = sh7786_pcie_config_access(PCI_ACCESS_WRITE, bus,

					devfn, where, &data);

out:

	spin_unlock_irqrestore(&sh7786_pcie_lock, flags);

	return ret;

}



struct pci_ops sh7786_pci_ops = {

	.read	= sh7786_pcie_read,

	.write	= sh7786_pcie_write,

};