mn10300: add the MN10300/AM33 architecture to the kernel

Add architecture support for the MN10300/AM33 CPUs produced by MEI to the
kernel.

This patch also adds board support for the ASB2303 with the ASB2308 daughter
board, and the ASB2305.  The only processor supported is the MN103E010, which
is an AM33v2 core plus on-chip devices.

[akpm@linux-foundation.org: nuke cvs control strings]
Signed-off-by: Masakazu Urade <urade.masakazu@jp.panasonic.com>
Signed-off-by: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 545 insertions, 0 deletions

diff --git a/arch/mn10300/unit-asb2305/pci.c b/arch/mn10300/unit-asb2305/pci.c
new file mode 100644
index 00000000000..1a86425fec4
--- /dev/null
+++ b/arch/mn10300/unit-asb2305/pci.c
@@ -0,0 +1,545 @@
+/* ASB2305 PCI support
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ * Derived from arch/i386/kernel/pci-pc.c
+ *	(c) 1999--2000 Martin Mares <mj@suse.cz>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <asm/io.h>
+#include "pci-asb2305.h"
+
+unsigned int pci_probe = 1;
+
+int pcibios_last_bus = -1;
+struct pci_bus *pci_root_bus;
+struct pci_ops *pci_root_ops;
+
+/*
+ * Functions for accessing PCI configuration space
+ */
+
+#define CONFIG_CMD(bus, devfn, where) \
+	(0x80000000 | (bus->number << 16) | (devfn << 8) | (where & ~3))
+
+#define MEM_PAGING_REG	(*(volatile __u32 *) 0xBFFFFFF4)
+#define CONFIG_ADDRESS	(*(volatile __u32 *) 0xBFFFFFF8)
+#define CONFIG_DATAL(X)	(*(volatile __u32 *) 0xBFFFFFFC)
+#define CONFIG_DATAW(X)	(*(volatile __u16 *) (0xBFFFFFFC + ((X) & 2)))
+#define CONFIG_DATAB(X)	(*(volatile __u8  *) (0xBFFFFFFC + ((X) & 3)))
+
+#define BRIDGEREGB(X)	(*(volatile __u8  *) (0xBE040000 + (X)))
+#define BRIDGEREGW(X)	(*(volatile __u16 *) (0xBE040000 + (X)))
+#define BRIDGEREGL(X)	(*(volatile __u32 *) (0xBE040000 + (X)))
+
+static inline int __query(const struct pci_bus *bus, unsigned int devfn)
+{
+#if 0
+	return bus->number == 0 && (devfn == PCI_DEVFN(0, 0));
+	return bus->number == 1;
+	return bus->number == 0 &&
+		(devfn == PCI_DEVFN(2, 0) || devfn == PCI_DEVFN(3, 0));
+#endif
+	return 1;
+}
+
+/*
+ * translate Linuxcentric addresses to PCI bus addresses
+ */
+void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
+			     struct resource *res)
+{
+	if (res->flags & IORESOURCE_IO) {
+		region->start = (res->start & 0x00ffffff);
+		region->end   = (res->end   & 0x00ffffff);
+	}
+
+	if (res->flags & IORESOURCE_MEM) {
+		region->start = (res->start & 0x03ffffff) | MEM_PAGING_REG;
+		region->end   = (res->end   & 0x03ffffff) | MEM_PAGING_REG;
+	}
+
+#if 0
+	printk(KERN_DEBUG "RES->BUS: %lx-%lx => %lx-%lx\n",
+	       res->start, res->end, region->start, region->end);
+#endif
+}
+EXPORT_SYMBOL(pcibios_resource_to_bus);
+
+/*
+ * translate PCI bus addresses to Linuxcentric addresses
+ */
+void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
+			     struct pci_bus_region *region)
+{
+	if (res->flags & IORESOURCE_IO) {
+		res->start = (region->start & 0x00ffffff) | 0xbe000000;
+		res->end   = (region->end   & 0x00ffffff) | 0xbe000000;
+	}
+
+	if (res->flags & IORESOURCE_MEM) {
+		res->start = (region->start & 0x03ffffff) | 0xb8000000;
+		res->end   = (region->end   & 0x03ffffff) | 0xb8000000;
+	}
+
+#if 0
+	printk(KERN_INFO "BUS->RES: %lx-%lx => %lx-%lx\n",
+	       region->start, region->end, res->start, res->end);
+#endif
+}
+EXPORT_SYMBOL(pcibios_bus_to_resource);
+
+/*
+ *
+ */
+static int pci_ampci_read_config_byte(struct pci_bus *bus, unsigned int devfn,
+				      int where, u32 *_value)
+{
+	u32 rawval, value;
+
+	if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) {
+		value = BRIDGEREGB(where);
+		__pcbdebug("=> %02hx", &BRIDGEREGL(where), value);
+	} else {
+		CONFIG_ADDRESS = CONFIG_CMD(bus, devfn, where);
+		rawval = CONFIG_ADDRESS;
+		value = CONFIG_DATAB(where);
+		if (__query(bus, devfn))
+			__pcidebug("=> %02hx", bus, devfn, where, value);
+	}
+
+	*_value = value;
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int pci_ampci_read_config_word(struct pci_bus *bus, unsigned int devfn,
+				      int where, u32 *_value)
+{
+	u32 rawval, value;
+
+	if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) {
+		value = BRIDGEREGW(where);
+		__pcbdebug("=> %04hx", &BRIDGEREGL(where), value);
+	} else {
+		CONFIG_ADDRESS = CONFIG_CMD(bus, devfn, where);
+		rawval = CONFIG_ADDRESS;
+		value = CONFIG_DATAW(where);
+		if (__query(bus, devfn))
+			__pcidebug("=> %04hx", bus, devfn, where, value);
+	}
+
+	*_value = value;
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int pci_ampci_read_config_dword(struct pci_bus *bus, unsigned int devfn,
+				       int where, u32 *_value)
+{
+	u32 rawval, value;
+
+	if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) {
+		value = BRIDGEREGL(where);
+		__pcbdebug("=> %08x", &BRIDGEREGL(where), value);
+	} else {
+		CONFIG_ADDRESS = CONFIG_CMD(bus, devfn, where);
+		rawval = CONFIG_ADDRESS;
+		value = CONFIG_DATAL(where);
+		if (__query(bus, devfn))
+			__pcidebug("=> %08x", bus, devfn, where, value);
+	}
+
+	*_value = value;
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int pci_ampci_write_config_byte(struct pci_bus *bus, unsigned int devfn,
+				       int where, u8 value)
+{
+	u32 rawval;
+
+	if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) {
+		__pcbdebug("<= %02x", &BRIDGEREGB(where), value);
+		BRIDGEREGB(where) = value;
+	} else {
+		if (bus->number == 0 &&
+		    (devfn == PCI_DEVFN(2, 0) && devfn == PCI_DEVFN(3, 0))
+		    )
+			__pcidebug("<= %02x", bus, devfn, where, value);
+		CONFIG_ADDRESS = CONFIG_CMD(bus, devfn, where);
+		rawval = CONFIG_ADDRESS;
+		CONFIG_DATAB(where) = value;
+	}
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int pci_ampci_write_config_word(struct pci_bus *bus, unsigned int devfn,
+				       int where, u16 value)
+{
+	u32 rawval;
+
+	if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) {
+		__pcbdebug("<= %04hx", &BRIDGEREGW(where), value);
+		BRIDGEREGW(where) = value;
+	} else {
+		if (__query(bus, devfn))
+			__pcidebug("<= %04hx", bus, devfn, where, value);
+		CONFIG_ADDRESS = CONFIG_CMD(bus, devfn, where);
+		rawval = CONFIG_ADDRESS;
+		CONFIG_DATAW(where) = value;
+	}
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int pci_ampci_write_config_dword(struct pci_bus *bus, unsigned int devfn,
+					int where, u32 value)
+{
+	u32 rawval;
+
+	if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) {
+		__pcbdebug("<= %08x", &BRIDGEREGL(where), value);
+		BRIDGEREGL(where) = value;
+	} else {
+		if (__query(bus, devfn))
+			__pcidebug("<= %08x", bus, devfn, where, value);
+		CONFIG_ADDRESS = CONFIG_CMD(bus, devfn, where);
+		rawval = CONFIG_ADDRESS;
+		CONFIG_DATAL(where) = value;
+	}
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int pci_ampci_read_config(struct pci_bus *bus, unsigned int devfn,
+				 int where, int size, u32 *val)
+{
+	switch (size) {
+	case 1:
+		return pci_ampci_read_config_byte(bus, devfn, where, val);
+	case 2:
+		return pci_ampci_read_config_word(bus, devfn, where, val);
+	case 4:
+		return pci_ampci_read_config_dword(bus, devfn, where, val);
+	default:
+		BUG();
+		return -EOPNOTSUPP;
+	}
+}
+
+static int pci_ampci_write_config(struct pci_bus *bus, unsigned int devfn,
+				  int where, int size, u32 val)
+{
+	switch (size) {
+	case 1:
+		return pci_ampci_write_config_byte(bus, devfn, where, val);
+	case 2:
+		return pci_ampci_write_config_word(bus, devfn, where, val);
+	case 4:
+		return pci_ampci_write_config_dword(bus, devfn, where, val);
+	default:
+		BUG();
+		return -EOPNOTSUPP;
+	}
+}
+
+static struct pci_ops pci_direct_ampci = {
+	pci_ampci_read_config,
+	pci_ampci_write_config,
+};
+
+/*
+ * Before we decide to use direct hardware access mechanisms, we try to do some
+ * trivial checks to ensure it at least _seems_ to be working -- we just test
+ * whether bus 00 contains a host bridge (this is similar to checking
+ * techniques used in XFree86, but ours should be more reliable since we
+ * attempt to make use of direct access hints provided by the PCI BIOS).
+ *
+ * This should be close to trivial, but it isn't, because there are buggy
+ * chipsets (yes, you guessed it, by Intel and Compaq) that have no class ID.
+ */
+static int __init pci_sanity_check(struct pci_ops *o)
+{
+	struct pci_bus bus;		/* Fake bus and device */
+	u32 x;
+
+	bus.number = 0;
+
+	if ((!o->read(&bus, 0, PCI_CLASS_DEVICE, 2, &x) &&
+	     (x == PCI_CLASS_BRIDGE_HOST || x == PCI_CLASS_DISPLAY_VGA)) ||
+	    (!o->read(&bus, 0, PCI_VENDOR_ID, 2, &x) &&
+	     (x == PCI_VENDOR_ID_INTEL || x == PCI_VENDOR_ID_COMPAQ)))
+		return 1;
+
+	printk(KERN_ERROR "PCI: Sanity check failed\n");
+	return 0;
+}
+
+static int __init pci_check_direct(void)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+
+	/*
+	 * Check if access works.
+	 */
+	if (pci_sanity_check(&pci_direct_ampci)) {
+		local_irq_restore(flags);
+		printk(KERN_INFO "PCI: Using configuration ampci\n");
+		request_mem_region(0xBE040000, 256, "AMPCI bridge");
+		request_mem_region(0xBFFFFFF4, 12, "PCI ampci");
+		return 0;
+	}
+
+	local_irq_restore(flags);
+	return -ENODEV;
+}
+
+static int __devinit is_valid_resource(struct pci_dev *dev, int idx)
+{
+	unsigned int i, type_mask = IORESOURCE_IO | IORESOURCE_MEM;
+	struct resource *devr = &dev->resource[idx];
+
+	if (dev->bus) {
+		for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
+			struct resource *busr = dev->bus->resource[i];
+
+			if (!busr || (busr->flags ^ devr->flags) & type_mask)
+				continue;
+
+			if (devr->start &&
+			    devr->start >= busr->start &&
+			    devr->end <= busr->end)
+				return 1;
+		}
+	}
+
+	return 0;
+}
+
+static void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)
+{
+	struct pci_bus_region region;
+	int i;
+	int limit;
+
+	if (dev->bus->number != 0)
+		return;
+
+	limit = (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) ?
+		PCI_BRIDGE_RESOURCES : PCI_NUM_RESOURCES;
+
+	for (i = 0; i < limit; i++) {
+		if (!dev->resource[i].flags)
+			continue;
+
+		region.start = dev->resource[i].start;
+		region.end = dev->resource[i].end;
+		pcibios_bus_to_resource(dev, &dev->resource[i], &region);
+		if (is_valid_resource(dev, i))
+			pci_claim_resource(dev, i);
+	}
+}
+
+/*
+ *  Called after each bus is probed, but before its children
+ *  are examined.
+ */
+void __devinit pcibios_fixup_bus(struct pci_bus *bus)
+{
+	struct pci_dev *dev;
+
+	if (bus->self) {
+		pci_read_bridge_bases(bus);
+		pcibios_fixup_device_resources(bus->self);
+	}
+
+	list_for_each_entry(dev, &bus->devices, bus_list)
+		pcibios_fixup_device_resources(dev);
+}
+
+/*
+ * Initialization. Try all known PCI access methods. Note that we support
+ * using both PCI BIOS and direct access: in such cases, we use I/O ports
+ * to access config space, but we still keep BIOS order of cards to be
+ * compatible with 2.0.X. This should go away some day.
+ */
+static int __init pcibios_init(void)
+{
+	ioport_resource.start	= 0xA0000000;
+	ioport_resource.end	= 0xDFFFFFFF;
+	iomem_resource.start	= 0xA0000000;
+	iomem_resource.end	= 0xDFFFFFFF;
+
+	if (!pci_probe)
+		return 0;
+
+	if (pci_check_direct() < 0) {
+		printk(KERN_WARNING "PCI: No PCI bus detected\n");
+		return 0;
+	}
+
+	printk(KERN_INFO "PCI: Probing PCI hardware [mempage %08x]\n",
+	       MEM_PAGING_REG);
+
+	{
+#if 0
+		static struct pci_bus am33_root_bus = {
+			.children  = LIST_HEAD_INIT(am33_root_bus.children),
+			.devices   = LIST_HEAD_INIT(am33_root_bus.devices),
+			.number    = 0,
+			.secondary = 0,
+			.resource = { &ioport_resource, &iomem_resource },
+		};
+
+		am33_root_bus.ops = pci_root_ops;
+		list_add_tail(&am33_root_bus.node, &pci_root_buses);
+
+		am33_root_bus.subordinate = pci_do_scan_bus(0);
+
+		pci_root_bus = &am33_root_bus;
+#else
+		pci_root_bus = pci_scan_bus(0, &pci_direct_ampci, NULL);
+#endif
+	}
+
+	pcibios_irq_init();
+	pcibios_fixup_irqs();
+#if 0
+	pcibios_resource_survey();
+#endif
+	return 0;
+}
+
+arch_initcall(pcibios_init);
+
+char *__init pcibios_setup(char *str)
+{
+	if (!strcmp(str, "off")) {
+		pci_probe = 0;
+		return NULL;
+
+	} else if (!strncmp(str, "lastbus=", 8)) {
+		pcibios_last_bus = simple_strtol(str+8, NULL, 0);
+		return NULL;
+	}
+
+	return str;
+}
+
+int pcibios_enable_device(struct pci_dev *dev, int mask)
+{
+	int err;
+
+	err = pcibios_enable_resources(dev, mask);
+	if (err == 0)
+		pcibios_enable_irq(dev);
+	return err;
+}
+
+/*
+ * disable the ethernet chipset
+ */
+static void __init unit_disable_pcnet(struct pci_bus *bus, struct pci_ops *o)
+{
+	u32 x;
+
+	bus->number = 0;
+
+	o->read (bus, PCI_DEVFN(2, 0), PCI_COMMAND,		2, &x);
+	x |= PCI_COMMAND_MASTER |
+		PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
+		PCI_COMMAND_SERR | PCI_COMMAND_PARITY;
+	o->write(bus, PCI_DEVFN(2, 0), PCI_COMMAND,		2, x);
+	o->read (bus, PCI_DEVFN(2, 0), PCI_COMMAND,		2, &x);
+	o->write(bus, PCI_DEVFN(2, 0), PCI_BASE_ADDRESS_0,	4, 0x00030001);
+	o->read (bus, PCI_DEVFN(2, 0), PCI_BASE_ADDRESS_0,	4, &x);
+
+#define RDP (*(volatile u32 *) 0xBE030010)
+#define RAP (*(volatile u32 *) 0xBE030014)
+#define __set_RAP(X) do { RAP = (X); x = RAP; } while (0)
+#define __set_RDP(X) do { RDP = (X); x = RDP; } while (0)
+#define __get_RDP() ({ RDP & 0xffff; })
+
+	__set_RAP(0);
+	__set_RDP(0x0004);	/* CSR0 = STOP */
+
+	__set_RAP(88);		/* check CSR88 indicates an Am79C973 */
+	BUG_ON(__get_RDP() != 0x5003);
+
+	for (x = 0; x < 100; x++)
+		asm volatile("nop");
+
+	__set_RDP(0x0004);	/* CSR0 = STOP */
+}
+
+/*
+ * initialise the unit hardware
+ */
+asmlinkage void __init unit_pci_init(void)
+{
+	struct pci_bus bus;		/* Fake bus and device */
+	struct pci_ops *o = &pci_direct_ampci;
+	u32 x;
+
+	set_intr_level(XIRQ1, GxICR_LEVEL_3);
+
+	memset(&bus, 0, sizeof(bus));
+
+	MEM_PAGING_REG = 0xE8000000;
+
+	/* we need to set up the bridge _now_ or we won't be able to access the
+	 * PCI config registers
+	 */
+	BRIDGEREGW(PCI_COMMAND) |=
+		PCI_COMMAND_SERR | PCI_COMMAND_PARITY |
+		PCI_COMMAND_MEMORY | PCI_COMMAND_IO | PCI_COMMAND_MASTER;
+	BRIDGEREGW(PCI_STATUS)		= 0xF800;
+	BRIDGEREGB(PCI_LATENCY_TIMER)	= 0x10;
+	BRIDGEREGL(PCI_BASE_ADDRESS_0)	= 0x80000000;
+	BRIDGEREGB(PCI_INTERRUPT_LINE)	= 1;
+	BRIDGEREGL(0x48)		= 0x98000000;	/* AMPCI base addr */
+	BRIDGEREGB(0x41)		= 0x00;		/* secondary bus
+							 * number */
+	BRIDGEREGB(0x42)		= 0x01;		/* subordinate bus
+							 * number */
+	BRIDGEREGB(0x44)		= 0x01;
+	BRIDGEREGL(0x50)		= 0x00000001;
+	BRIDGEREGL(0x58)		= 0x00001002;
+	BRIDGEREGL(0x5C)		= 0x00000011;
+
+	/* we also need to set up the PCI-PCI bridge */
+	bus.number = 0;
+
+	/* IO: 0x00000000-0x00020000 */
+	o->read (&bus, PCI_DEVFN(3, 0), PCI_COMMAND,		2, &x);
+	x |= PCI_COMMAND_MASTER |
+		PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
+		PCI_COMMAND_SERR | PCI_COMMAND_PARITY;
+	o->write(&bus, PCI_DEVFN(3, 0), PCI_COMMAND,		2, x);
+
+	o->read (&bus, PCI_DEVFN(3, 0), PCI_IO_BASE,		1, &x);
+	o->read (&bus, PCI_DEVFN(3, 0), PCI_IO_BASE_UPPER16,	4, &x);
+	o->read (&bus, PCI_DEVFN(3, 0), PCI_MEMORY_BASE,	4, &x);
+	o->read (&bus, PCI_DEVFN(3, 0), PCI_PREF_MEMORY_BASE,	4, &x);
+
+	o->write(&bus, PCI_DEVFN(3, 0), PCI_IO_BASE,		1, 0x01);
+	o->read (&bus, PCI_DEVFN(3, 0), PCI_IO_BASE,		1, &x);
+	o->write(&bus, PCI_DEVFN(3, 0), PCI_IO_BASE_UPPER16,	4, 0x00020000);
+	o->read (&bus, PCI_DEVFN(3, 0), PCI_IO_BASE_UPPER16,	4, &x);
+	o->write(&bus, PCI_DEVFN(3, 0), PCI_MEMORY_BASE,	4, 0xEBB0EA00);
+	o->read (&bus, PCI_DEVFN(3, 0), PCI_MEMORY_BASE,	4, &x);
+	o->write(&bus, PCI_DEVFN(3, 0), PCI_PREF_MEMORY_BASE,	4, 0xE9F0E800);
+	o->read (&bus, PCI_DEVFN(3, 0), PCI_PREF_MEMORY_BASE,	4, &x);
+
+	unit_disable_pcnet(&bus, o);
+}