/*
 * arch/ppc/platforms/85xx/stx_gp3.c
 *
 * STx GP3 board specific routines
 *
 * Dan Malek <dan@embeddededge.com>
 * Copyright 2004 Embedded Edge, LLC
 *
 * Copied from mpc8560_ads.c
 * Copyright 2002, 2003 Motorola Inc.
 *
 * Ported to 2.6, Matt Porter <mporter@kernel.crashing.org>
 * Copyright 2004-2005 MontaVista Software, 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/config.h>
#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/blkdev.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/root_dev.h>
#include <linux/seq_file.h>
#include <linux/serial.h>
#include <linux/initrd.h>
#include <linux/module.h>
#include <linux/fsl_devices.h>
#include <linux/interrupt.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/open_pic.h>
#include <asm/bootinfo.h>
#include <asm/pci-bridge.h>
#include <asm/mpc85xx.h>
#include <asm/irq.h>
#include <asm/immap_85xx.h>
#include <asm/immap_cpm2.h>
#include <asm/mpc85xx.h>
#include <asm/ppc_sys.h>

#include <syslib/cpm2_pic.h>
#include <syslib/ppc85xx_common.h>

extern void cpm2_reset(void);

unsigned char __res[sizeof(bd_t)];

#ifndef CONFIG_PCI
unsigned long isa_io_base = 0;
unsigned long isa_mem_base = 0;
unsigned long pci_dram_offset = 0;
#endif

/* Internal interrupts are all Level Sensitive, and Positive Polarity */
static u8 gp3_openpic_initsenses[] __initdata = {
	MPC85XX_INTERNAL_IRQ_SENSES,
	0x0,						/* External  0: */
#if defined(CONFIG_PCI)
	(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* External 1: PCI slot 0 */
	(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* External 2: PCI slot 1 */
	(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* External 3: PCI slot 2 */
	(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* External 4: PCI slot 3 */
#else
	0x0,				/* External  1: */
	0x0,				/* External  2: */
	0x0,				/* External  3: */
	0x0,				/* External  4: */
#endif
	0x0,				/* External  5: */
	0x0,				/* External  6: */
	0x0,				/* External  7: */
	0x0,				/* External  8: */
	0x0,				/* External  9: */
	0x0,				/* External 10: */
	0x0,				/* External 11: */
};

/*
 * Setup the architecture
 */
static void __init
gp3_setup_arch(void)
{
	bd_t *binfo = (bd_t *) __res;
	unsigned int freq;
	struct gianfar_platform_data *pdata;

	cpm2_reset();

	/* get the core frequency */
	freq = binfo->bi_intfreq;

	if (ppc_md.progress)
		ppc_md.progress("gp3_setup_arch()", 0);

	/* Set loops_per_jiffy to a half-way reasonable value,
	   for use until calibrate_delay gets called. */
	loops_per_jiffy = freq / HZ;

#ifdef CONFIG_PCI
	/* setup PCI host bridges */
	mpc85xx_setup_hose();
#endif

	/* setup the board related information for the enet controllers */
	pdata = (struct gianfar_platform_data *) ppc_sys_get_pdata(MPC85xx_TSEC1);
/*	pdata->board_flags = FSL_GIANFAR_BRD_HAS_PHY_INTR; */
	pdata->interruptPHY = MPC85xx_IRQ_EXT5;
	pdata->phyid = 2;
	pdata->phy_reg_addr += binfo->bi_immr_base;
	memcpy(pdata->mac_addr, binfo->bi_enetaddr, 6);

	pdata = (struct gianfar_platform_data *) ppc_sys_get_pdata(MPC85xx_TSEC2);
/*	pdata->board_flags = FSL_GIANFAR_BRD_HAS_PHY_INTR; */
	pdata->interruptPHY = MPC85xx_IRQ_EXT5;
	pdata->phyid = 4;
	/* fixup phy address */
	pdata->phy_reg_addr += binfo->bi_immr_base;
	memcpy(pdata->mac_addr, binfo->bi_enet1addr, 6);

#ifdef CONFIG_BLK_DEV_INITRD
	if (initrd_start)
		ROOT_DEV = Root_RAM0;
	else
#endif
#ifdef	CONFIG_ROOT_NFS
		ROOT_DEV = Root_NFS;
#else
		ROOT_DEV = Root_HDA1;
#endif

	printk ("bi_immr_base = %8.8lx\n", binfo->bi_immr_base);
}

static irqreturn_t cpm2_cascade(int irq, void *dev_id, struct pt_regs *regs)
{
	while ((irq = cpm2_get_irq(regs)) >= 0)
		__do_IRQ(irq, regs);

	return IRQ_HANDLED;
}

static struct irqaction cpm2_irqaction = {
	.handler	= cpm2_cascade,
	.flags		= SA_INTERRUPT,
	.mask		= CPU_MASK_NONE,
	.name		= "cpm2_cascade",
};

static void __init
gp3_init_IRQ(void)
{
	bd_t *binfo = (bd_t *) __res;

	/*
	 * Setup OpenPIC
	 */

	/* Determine the Physical Address of the OpenPIC regs */
	phys_addr_t OpenPIC_PAddr =
	    binfo->bi_immr_base + MPC85xx_OPENPIC_OFFSET;
	OpenPIC_Addr = ioremap(OpenPIC_PAddr, MPC85xx_OPENPIC_SIZE);
	OpenPIC_InitSenses = gp3_openpic_initsenses;
	OpenPIC_NumInitSenses = sizeof (gp3_openpic_initsenses);

	/* Skip reserved space and internal sources */
	openpic_set_sources(0, 32, OpenPIC_Addr + 0x10200);

	/* Map PIC IRQs 0-11 */
	openpic_set_sources(48, 12, OpenPIC_Addr + 0x10000);

	/*
	 * Let openpic interrupts starting from an offset, to
	 * leave space for cascading interrupts underneath.
	 */
	openpic_init(MPC85xx_OPENPIC_IRQ_OFFSET);

	/* Setup CPM2 PIC */
        cpm2_init_IRQ();

	setup_irq(MPC85xx_IRQ_CPM, &cpm2_irqaction);

	return;
}

static int
gp3_show_cpuinfo(struct seq_file *m)
{
	uint pvid, svid, phid1;
	bd_t *binfo = (bd_t *) __res;
	uint	memsize;
	unsigned int freq;
	extern unsigned long total_memory;	/* in mm/init */

	/* get the core frequency */
	freq = binfo->bi_intfreq;

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

	memsize = total_memory;

	seq_printf(m, "Vendor\t\t: RPC Electronics STx \n");
	seq_printf(m, "Machine\t\t: GP3 - MPC%s\n", cur_ppc_sys_spec->ppc_sys_name);
	seq_printf(m, "bus freq\t: %u.%.6u MHz\n", freq / 1000000,
		   freq % 1000000);
	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));

	return 0;
}

#ifdef CONFIG_PCI
int mpc85xx_map_irq(struct pci_dev *dev, unsigned char idsel,
		    unsigned char pin)
{
	static char pci_irq_table[][4] =
	    /*
	     *      PCI IDSEL/INTPIN->INTLINE
	     *        A      B      C      D
	     */
	{
		{PIRQA, PIRQB, PIRQC, PIRQD},
		{PIRQD, PIRQA, PIRQB, PIRQC},
		{PIRQC, PIRQD, PIRQA, PIRQB},
		{PIRQB, PIRQC, PIRQD, PIRQA},
	};

	const long min_idsel = 12, max_idsel = 15, irqs_per_slot = 4;
	return PCI_IRQ_TABLE_LOOKUP;
}

int mpc85xx_exclude_device(u_char bus, u_char devfn)
{
	if (bus == 0 && PCI_SLOT(devfn) == 0)
		return PCIBIOS_DEVICE_NOT_FOUND;
	else
		return PCIBIOS_SUCCESSFUL;
}
#endif /* CONFIG_PCI */

void __init
platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
	      unsigned long r6, unsigned long r7)
{
	/* parse_bootinfo must always be called first */
	parse_bootinfo(find_bootinfo());

	/*
	 * If we were passed in a board information, copy it into the
	 * residual data area.
	 */
	if (r3) {
		memcpy((void *) __res, (void *) (r3 + KERNELBASE),
		       sizeof (bd_t));

	}
#if defined(CONFIG_BLK_DEV_INITRD)
	/*
	 * If the init RAM disk has been configured in, and there's a valid
	 * starting address for it, set it up.
	 */
	if (r4) {
		initrd_start = r4 + KERNELBASE;
		initrd_end = r5 + KERNELBASE;
	}
#endif				/* CONFIG_BLK_DEV_INITRD */

	/* Copy the kernel command line arguments to a safe place. */

	if (r6) {
		*(char *) (r7 + KERNELBASE) = 0;
		strcpy(cmd_line, (char *) (r6 + KERNELBASE));
	}

	identify_ppc_sys_by_id(mfspr(SPRN_SVR));

	/* setup the PowerPC module struct */
	ppc_md.setup_arch = gp3_setup_arch;
	ppc_md.show_cpuinfo = gp3_show_cpuinfo;

	ppc_md.init_IRQ = gp3_init_IRQ;
	ppc_md.get_irq = openpic_get_irq;

	ppc_md.restart = mpc85xx_restart;
	ppc_md.power_off = mpc85xx_power_off;
	ppc_md.halt = mpc85xx_halt;

	ppc_md.find_end_of_memory = mpc85xx_find_end_of_memory;

	ppc_md.calibrate_decr = mpc85xx_calibrate_decr;

	if (ppc_md.progress)
		ppc_md.progress("platform_init(): exit", 0);

	return;
}