mpc86xx_hpcn.c

/*
 * MPC86xx HPCN board specific routines
 *
 * Recode: ZHANG WEI <[email protected]>
 * Initial author: Xianghua Xiao <[email protected]>
 *
 * Copyright 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/delay.h>
#include <linux/seq_file.h>
#include <linux/of_platform.h>
#include <linux/memblock.h>

#include <asm/system.h>
#include <asm/time.h>
#include <asm/machdep.h>
#include <asm/pci-bridge.h>
#include <asm/prom.h>
#include <mm/mmu_decl.h>
#include <asm/udbg.h>
#include <asm/swiotlb.h>

#include <asm/mpic.h>

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

#include "mpc86xx.h"

#undef DEBUG

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

#ifdef CONFIG_PCI
extern int uli_exclude_device(struct pci_controller *hose,
				u_char bus, u_char devfn);

static int mpc86xx_exclude_device(struct pci_controller *hose,
				   u_char bus, u_char devfn)
{
	struct device_node* node;	
	struct resource rsrc;

	node = hose->dn;
	of_address_to_resource(node, 0, &rsrc);

	if ((rsrc.start & 0xfffff) == 0x8000) {
		return uli_exclude_device(hose, bus, devfn);
	}

	return PCIBIOS_SUCCESSFUL;
}
#endif /* CONFIG_PCI */


static void __init
mpc86xx_hpcn_setup_arch(void)
{
#ifdef CONFIG_PCI
	struct device_node *np;
	struct pci_controller *hose;
#endif
	dma_addr_t max = 0xffffffff;

	if (ppc_md.progress)
		ppc_md.progress("mpc86xx_hpcn_setup_arch()", 0);

#ifdef CONFIG_PCI
	for_each_compatible_node(np, "pci", "fsl,mpc8641-pcie") {
		struct resource rsrc;
		of_address_to_resource(np, 0, &rsrc);
		if ((rsrc.start & 0xfffff) == 0x8000)
			fsl_add_bridge(np, 1);
		else
			fsl_add_bridge(np, 0);
		hose = pci_find_hose_for_OF_device(np);
		max = min(max, hose->dma_window_base_cur +
			  hose->dma_window_size);
	}

	ppc_md.pci_exclude_device = mpc86xx_exclude_device;

#endif

	printk("MPC86xx HPCN board from Freescale Semiconductor\n");

#ifdef CONFIG_SMP
	mpc86xx_smp_init();
#endif

#ifdef CONFIG_SWIOTLB
	if (memblock_end_of_DRAM() > max) {
		ppc_swiotlb_enable = 1;
		set_pci_dma_ops(&swiotlb_dma_ops);
		ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_swiotlb;
	}
#endif
}


static void
mpc86xx_hpcn_show_cpuinfo(struct seq_file *m)
{
	uint svid = mfspr(SPRN_SVR);

	seq_printf(m, "Vendor\t\t: Freescale Semiconductor\n");

	seq_printf(m, "SVR\t\t: 0x%x\n", svid);
}


/*
 * Called very early, device-tree isn't unflattened
 */
static int __init mpc86xx_hpcn_probe(void)
{
	unsigned long root = of_get_flat_dt_root();

	if (of_flat_dt_is_compatible(root, "fsl,mpc8641hpcn"))
		return 1;	/* Looks good */

	/* Be nice and don't give silent boot death.  Delete this in 2.6.27 */
	if (of_flat_dt_is_compatible(root, "mpc86xx")) {
		pr_warning("WARNING: your dts/dtb is old. You must update before the next kernel release\n");
		return 1;
	}

	return 0;
}

static long __init
mpc86xx_time_init(void)
{
	unsigned int temp;

	/* Set the time base to zero */
	mtspr(SPRN_TBWL, 0);
	mtspr(SPRN_TBWU, 0);

	temp = mfspr(SPRN_HID0);
	temp |= HID0_TBEN;
	mtspr(SPRN_HID0, temp);
	asm volatile("isync");

	return 0;
}

static __initdata struct of_device_id of_bus_ids[] = {
	{ .compatible = "simple-bus", },
	{ .compatible = "fsl,rapidio-delta", },
	{ .compatible = "gianfar", },
	{},
};

static int __init declare_of_platform_devices(void)
{
	of_platform_bus_probe(NULL, of_bus_ids, NULL);

	return 0;
}
machine_device_initcall(mpc86xx_hpcn, declare_of_platform_devices);
machine_arch_initcall(mpc86xx_hpcn, swiotlb_setup_bus_notifier);

define_machine(mpc86xx_hpcn) {
	.name			= "MPC86xx HPCN",
	.probe			= mpc86xx_hpcn_probe,
	.setup_arch		= mpc86xx_hpcn_setup_arch,
	.init_IRQ		= mpc86xx_init_irq,
	.show_cpuinfo		= mpc86xx_hpcn_show_cpuinfo,
	.get_irq		= mpic_get_irq,
	.restart		= fsl_rstcr_restart,
	.time_init		= mpc86xx_time_init,
	.calibrate_decr		= generic_calibrate_decr,
	.progress		= udbg_progress,
#ifdef CONFIG_PCI
	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
#endif
};