mpc85xx_cds.c

/*
 * MPC85xx setup and early boot code plus other random bits.
 *
 * Maintained by Kumar Gala (see MAINTAINERS for contact information)
 *
 * Copyright 2005 Freescale Semiconductor Inc.
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/reboot.h>
#include <linux/pci.h>
#include <linux/kdev_t.h>
#include <linux/major.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/seq_file.h>
#include <linux/initrd.h>
#include <linux/module.h>
#include <linux/fsl_devices.h>

#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/atomic.h>
#include <asm/time.h>
#include <asm/io.h>
#include <asm/machdep.h>
#include <asm/ipic.h>
#include <asm/bootinfo.h>
#include <asm/pci-bridge.h>
#include <asm/mpc85xx.h>
#include <asm/irq.h>
#include <mm/mmu_decl.h>
#include <asm/prom.h>
#include <asm/udbg.h>
#include <asm/mpic.h>
#include <asm/i8259.h>

#include <sysdev/fsl_soc.h>
#include <sysdev/fsl_pci.h>
#include "mpc85xx.h"

static int cds_pci_slot = 2;
static volatile u8 *cadmus;

#ifdef CONFIG_PCI

#define ARCADIA_HOST_BRIDGE_IDSEL	17
#define ARCADIA_2ND_BRIDGE_IDSEL	3

static int mpc85xx_exclude_device(struct pci_controller *hose,
				  u_char bus, u_char devfn)
{
	/* We explicitly do not go past the Tundra 320 Bridge */
	if ((bus == 1) && (PCI_SLOT(devfn) == ARCADIA_2ND_BRIDGE_IDSEL))
		return PCIBIOS_DEVICE_NOT_FOUND;
	if ((bus == 0) && (PCI_SLOT(devfn) == ARCADIA_2ND_BRIDGE_IDSEL))
		return PCIBIOS_DEVICE_NOT_FOUND;
	else
		return PCIBIOS_SUCCESSFUL;
}

static void __init mpc85xx_cds_pci_irq_fixup(struct pci_dev *dev)
{
	u_char c;
	if (dev->vendor == PCI_VENDOR_ID_VIA) {
		switch (dev->device) {
		case PCI_DEVICE_ID_VIA_82C586_1:
			/*
			 * U-Boot does not set the enable bits
			 * for the IDE device. Force them on here.
			 */
			pci_read_config_byte(dev, 0x40, &c);
			c |= 0x03; /* IDE: Chip Enable Bits */
			pci_write_config_byte(dev, 0x40, c);

			/*
			 * Since only primary interface works, force the
			 * IDE function to standard primary IDE interrupt
			 * w/ 8259 offset
			 */
			dev->irq = 14;
			pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
			break;
		/*
		 * Force legacy USB interrupt routing
		 */
		case PCI_DEVICE_ID_VIA_82C586_2:
		/* There are two USB controllers.
		 * Identify them by functon number
		 */
			if (PCI_FUNC(dev->devfn))
				dev->irq = 11;
			else
				dev->irq = 10;
			pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
		default:
			break;
		}
	}
}

static void __devinit skip_fake_bridge(struct pci_dev *dev)
{
	/* Make it an error to skip the fake bridge
	 * in pci_setup_device() in probe.c */
	dev->hdr_type = 0x7f;
}
DECLARE_PCI_FIXUP_EARLY(0x1957, 0x3fff, skip_fake_bridge);
DECLARE_PCI_FIXUP_EARLY(0x3fff, 0x1957, skip_fake_bridge);
DECLARE_PCI_FIXUP_EARLY(0xff3f, 0x5719, skip_fake_bridge);

#ifdef CONFIG_PPC_I8259
#warning The i8259 PIC support is currently broken
static void mpc85xx_8259_cascade(unsigned int irq, struct irq_desc *desc)
{
	unsigned int cascade_irq = i8259_irq();

	if (cascade_irq != NO_IRQ)
		generic_handle_irq(cascade_irq);

	desc->chip->eoi(irq);
}
#endif /* PPC_I8259 */
#endif /* CONFIG_PCI */

static void __init mpc85xx_cds_pic_init(void)
{
	struct mpic *mpic;
	struct resource r;
	struct device_node *np = NULL;
#ifdef CONFIG_PPC_I8259
	struct device_node *cascade_node = NULL;
	int cascade_irq;
#endif

	np = of_find_node_by_type(np, "open-pic");

	if (np == NULL) {
		printk(KERN_ERR "Could not find open-pic node\n");
		return;
	}

	if (of_address_to_resource(np, 0, &r)) {
		printk(KERN_ERR "Failed to map mpic register space\n");
		of_node_put(np);
		return;
	}

	mpic = mpic_alloc(np, r.start,
			MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN,
			0, 256, " OpenPIC  ");
	BUG_ON(mpic == NULL);

	/* Return the mpic node */
	of_node_put(np);

	mpic_init(mpic);

#ifdef CONFIG_PPC_I8259
	/* Initialize the i8259 controller */
	for_each_node_by_type(np, "interrupt-controller")
		if (of_device_is_compatible(np, "chrp,iic")) {
			cascade_node = np;
			break;
		}

	if (cascade_node == NULL) {
		printk(KERN_DEBUG "Could not find i8259 PIC\n");
		return;
	}

	cascade_irq = irq_of_parse_and_map(cascade_node, 0);
	if (cascade_irq == NO_IRQ) {
		printk(KERN_ERR "Failed to map cascade interrupt\n");
		return;
	}

	i8259_init(cascade_node, 0);
	of_node_put(cascade_node);

	set_irq_chained_handler(cascade_irq, mpc85xx_8259_cascade);
#endif /* CONFIG_PPC_I8259 */
}

/*
 * Setup the architecture
 */
static void __init mpc85xx_cds_setup_arch(void)
{
	struct device_node *cpu;
#ifdef CONFIG_PCI
	struct device_node *np;
#endif

	if (ppc_md.progress)
		ppc_md.progress("mpc85xx_cds_setup_arch()", 0);

	cpu = of_find_node_by_type(NULL, "cpu");
	if (cpu != 0) {
		const unsigned int *fp;

		fp = of_get_property(cpu, "clock-frequency", NULL);
		if (fp != 0)
			loops_per_jiffy = *fp / HZ;
		else
			loops_per_jiffy = 500000000 / HZ;
		of_node_put(cpu);
	}

	cadmus = ioremap(CADMUS_BASE, CADMUS_SIZE);
	cds_pci_slot = ((cadmus[CM_CSR] >> 6) & 0x3) + 1;

	if (ppc_md.progress) {
		char buf[40];
		snprintf(buf, 40, "CDS Version = 0x%x in slot %d\n",
				cadmus[CM_VER], cds_pci_slot);
		ppc_md.progress(buf, 0);
	}

#ifdef CONFIG_PCI
	for (np = NULL; (np = of_find_node_by_type(np, "pci")) != NULL;) {
		struct resource rsrc;
		of_address_to_resource(np, 0, &rsrc);
		if ((rsrc.start & 0xfffff) == 0x9000)
			fsl_add_bridge(np, 0);
		else
			fsl_add_bridge(np, 1);
	}
	ppc_md.pci_irq_fixup = mpc85xx_cds_pci_irq_fixup;
	ppc_md.pci_exclude_device = mpc85xx_exclude_device;
#endif
}

static void mpc85xx_cds_show_cpuinfo(struct seq_file *m)
{
	uint pvid, svid, phid1;
	uint memsize = total_memory;

	pvid = mfspr(SPRN_PVR);
	svid = mfspr(SPRN_SVR);

	seq_printf(m, "Vendor\t\t: Freescale Semiconductor\n");
	seq_printf(m, "Machine\t\t: MPC85xx CDS (0x%x)\n", cadmus[CM_VER]);
	seq_printf(m, "PVR\t\t: 0x%x\n", pvid);
	seq_printf(m, "SVR\t\t: 0x%x\n", svid);

	/* Display cpu Pll setting */
	phid1 = mfspr(SPRN_HID1);
	seq_printf(m, "PLL setting\t: 0x%x\n", ((phid1 >> 24) & 0x3f));

	/* Display the amount of memory */
	seq_printf(m, "Memory\t\t: %d MB\n", memsize / (1024 * 1024));
}


/*
 * Called very early, device-tree isn't unflattened
 */
static int __init mpc85xx_cds_probe(void)
{
        unsigned long root = of_get_flat_dt_root();

        return of_flat_dt_is_compatible(root, "MPC85xxCDS");
}

define_machine(mpc85xx_cds) {
	.name		= "MPC85xx CDS",
	.probe		= mpc85xx_cds_probe,
	.setup_arch	= mpc85xx_cds_setup_arch,
	.init_IRQ	= mpc85xx_cds_pic_init,
	.show_cpuinfo	= mpc85xx_cds_show_cpuinfo,
	.get_irq	= mpic_get_irq,
	.restart	= mpc85xx_restart,
	.calibrate_decr = generic_calibrate_decr,
	.progress	= udbg_progress,
	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
};