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: Paul Mundt <lethal@linux-sh.org>

1 files changed, 134 insertions, 0 deletions

diff --git a/arch/sh/drivers/pci/ops-sh7786.c b/arch/sh/drivers/pci/ops-sh7786.c
new file mode 100644
index 000000000000..48f594b9582b
--- /dev/null
+++ b/arch/sh/drivers/pci/ops-sh7786.c
@@ -0,0 +1,134 @@
+/*
+ * 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,
+};