mpc7448_hpc2.c

/*
 * mpc7448_hpc2.c
 *
 * Board setup routines for the Freescale mpc7448hpc2(taiga) platform
 *
 * Author: Jacob Pan
 *	 jacob.pan@freescale.com
 * Author: Xianghua Xiao
 *       x.xiao@freescale.com
 * Maintainer: Roy Zang <tie-fei.zang@freescale.com>
 * 	Add Flat Device Tree support fot mpc7448hpc2 board
 *
 * Copyright 2004-2006 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/pci.h>
#include <linux/kdev_t.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/ide.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <linux/serial.h>
#include <linux/tty.h>
#include <linux/serial_core.h>

#include <asm/system.h>
#include <asm/time.h>
#include <asm/machdep.h>
#include <asm/prom.h>
#include <asm/udbg.h>
#include <asm/tsi108.h>
#include <asm/pci-bridge.h>
#include <asm/reg.h>
#include <mm/mmu_decl.h>
#include "mpc7448_hpc2.h"
#include <asm/tsi108_irq.h>
#include <asm/mpic.h>

#undef DEBUG
#ifdef DEBUG
#define DBG(fmt...) do { printk(fmt); } while(0)
#else
#define DBG(fmt...) do { } while(0)
#endif

#ifndef CONFIG_PCI
isa_io_base = MPC7448_HPC2_ISA_IO_BASE;
isa_mem_base = MPC7448_HPC2_ISA_MEM_BASE;
pci_dram_offset = MPC7448_HPC2_PCI_MEM_OFFSET;
#endif

extern int tsi108_setup_pci(struct device_node *dev);
extern void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val);
extern void tsi108_pci_int_init(void);
extern void tsi108_irq_cascade(unsigned int irq, struct irq_desc *desc);

int mpc7448_hpc2_exclude_device(u_char bus, u_char devfn)
{
	if (bus == 0 && PCI_SLOT(devfn) == 0)
		return PCIBIOS_DEVICE_NOT_FOUND;
	else
		return PCIBIOS_SUCCESSFUL;
}

/*
 * find pci slot by devfn in interrupt map of OF tree
 */
u8 find_slot_by_devfn(unsigned int *interrupt_map, unsigned int devfn)
{
	int i;
	unsigned int tmp;
	for (i = 0; i < 4; i++){
		tmp = interrupt_map[i*4*7];
		if ((tmp >> 11) == (devfn >> 3))
			return i;
	}
	return i;
}

/*
 * Scans the interrupt map for pci device
 */
void __devinit mpc7448_hpc2_fixup_irq(struct pci_dev *dev)
{
	struct pci_controller *hose;
	struct device_node *node;
	const unsigned int *interrupt;
	int busnr;
	int len;
	u8 slot;
	u8 pin;

	/* Lookup the hose */
	busnr = dev->bus->number;
	hose = pci_bus_to_hose(busnr);
	if (!hose)
		printk(KERN_ERR "No pci hose found\n");

	/* Check it has an OF node associated */
	node = (struct device_node *) hose->arch_data;
	if (!node)
		printk(KERN_ERR "No pci node found\n");

	interrupt = get_property(node, "interrupt-map", &len);
	slot = find_slot_by_devfn(interrupt, dev->devfn);
	pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
	if (pin == 0 || pin > 4)
		pin = 1;
	pin--;
	dev->irq  = interrupt[slot*4*7 + pin*7 + 5];

	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);

	DBG("TSI_PCI: dev->irq = 0x%x\n", dev->irq);
}
/* temporary pci irq map fixup*/

static void __init mpc7448_hpc2_setup_arch(void)
{
	struct device_node *cpu;
	struct device_node *np;
	if (ppc_md.progress)
		ppc_md.progress("mpc7448_hpc2_setup_arch():set_bridge", 0);

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

		fp = get_property(cpu, "clock-frequency", NULL);
		if (fp != 0)
			loops_per_jiffy = *fp / HZ;
		else
			loops_per_jiffy = 50000000 / HZ;
		of_node_put(cpu);
	}
	tsi108_csr_vir_base = get_vir_csrbase();

#ifdef	CONFIG_ROOT_NFS
	ROOT_DEV = Root_NFS;
#else
	ROOT_DEV = Root_HDA1;
#endif

#ifdef CONFIG_BLK_DEV_INITRD
	ROOT_DEV = Root_RAM0;
#endif

	/* setup PCI host bridge */
#ifdef CONFIG_PCI
	for (np = NULL; (np = of_find_node_by_type(np, "pci")) != NULL;)
		tsi108_setup_pci(np);

	ppc_md.pci_exclude_device = mpc7448_hpc2_exclude_device;
	if (ppc_md.progress)
		ppc_md.progress("tsi108: resources set", 0x100);
#endif

	printk(KERN_INFO "MPC7448HPC2 (TAIGA) Platform\n");
	printk(KERN_INFO
	       "Jointly ported by Freescale and Tundra Semiconductor\n");
	printk(KERN_INFO
	       "Enabling L2 cache then enabling the HID0 prefetch engine.\n");
}

/*
 * Interrupt setup and service.  Interrrupts on the mpc7448_hpc2 come
 * from the four external INT pins, PCI interrupts are routed via
 * PCI interrupt control registers, it generates internal IRQ23
 *
 * Interrupt routing on the Taiga Board:
 * TSI108:PB_INT[0] -> CPU0:INT#
 * TSI108:PB_INT[1] -> CPU0:MCP#
 * TSI108:PB_INT[2] -> N/C
 * TSI108:PB_INT[3] -> N/C
 */
static void __init mpc7448_hpc2_init_IRQ(void)
{
	struct mpic *mpic;
	phys_addr_t mpic_paddr = 0;
	unsigned int cascade_pci_irq;
	struct device_node *tsi_pci;
	struct device_node *tsi_pic;

	tsi_pic = of_find_node_by_type(NULL, "open-pic");
	if (tsi_pic) {
		unsigned int size;
		const void *prop = get_property(tsi_pic, "reg", &size);
		mpic_paddr = of_translate_address(tsi_pic, prop);
	}

	if (mpic_paddr == 0) {
		printk("%s: No tsi108 PIC found !\n", __FUNCTION__);
		return;
	}

	DBG("%s: tsi108pic phys_addr = 0x%x\n", __FUNCTION__,
	    (u32) mpic_paddr);

	mpic = mpic_alloc(tsi_pic, mpic_paddr,
			MPIC_PRIMARY | MPIC_BIG_ENDIAN | MPIC_WANTS_RESET |
			MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
			0, /* num_sources used */
			0, /* num_sources used */
			"Tsi108_PIC");

	BUG_ON(mpic == NULL); /* XXXX */
	mpic_init(mpic);

	tsi_pci = of_find_node_by_type(NULL, "pci");
	if (tsi_pci == 0) {
		printk("%s: No tsi108 pci node found !\n", __FUNCTION__);
		return;
	}

	cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0);
	set_irq_data(cascade_pci_irq, mpic);
	set_irq_chained_handler(cascade_pci_irq, tsi108_irq_cascade);

	tsi108_pci_int_init();

	/* Configure MPIC outputs to CPU0 */
	tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
	of_node_put(tsi_pic);
}

void mpc7448_hpc2_show_cpuinfo(struct seq_file *m)
{
	seq_printf(m, "vendor\t\t: Freescale Semiconductor\n");
	seq_printf(m, "machine\t\t: MPC7448hpc2\n");
}

void mpc7448_hpc2_restart(char *cmd)
{
	local_irq_disable();

	/* Set exception prefix high - to the firmware */
	_nmask_and_or_msr(0, MSR_IP);

	for (;;) ;		/* Spin until reset happens */
}

void mpc7448_hpc2_power_off(void)
{
	local_irq_disable();
	for (;;) ;		/* No way to shut power off with software */
}

void mpc7448_hpc2_halt(void)
{
	mpc7448_hpc2_power_off();
}

/*
 * Called very early, device-tree isn't unflattened
 */
static int __init mpc7448_hpc2_probe(void)
{
	unsigned long root = of_get_flat_dt_root();

	if (!of_flat_dt_is_compatible(root, "mpc74xx"))
		return 0;
	return 1;
}

static int mpc7448_machine_check_exception(struct pt_regs *regs)
{
	extern void tsi108_clear_pci_cfg_error(void);
	const struct exception_table_entry *entry;

	/* Are we prepared to handle this fault */
	if ((entry = search_exception_tables(regs->nip)) != NULL) {
		tsi108_clear_pci_cfg_error();
		regs->msr |= MSR_RI;
		regs->nip = entry->fixup;
		return 1;
	}
	return 0;

}

define_machine(mpc7448_hpc2){
	.name 			= "MPC7448 HPC2",
	.probe 			= mpc7448_hpc2_probe,
	.setup_arch 		= mpc7448_hpc2_setup_arch,
	.init_IRQ 		= mpc7448_hpc2_init_IRQ,
	.show_cpuinfo 		= mpc7448_hpc2_show_cpuinfo,
	.get_irq 		= mpic_get_irq,
	.pci_irq_fixup 		= mpc7448_hpc2_fixup_irq,
	.restart 		= mpc7448_hpc2_restart,
	.calibrate_decr 	= generic_calibrate_decr,
	.machine_check_exception= mpc7448_machine_check_exception,
	.progress 		= udbg_progress,
};