/*
 * Carsten Langgaard, carstenl@mips.com
 * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
 * Copyright (C) 2008 Dmitri Vorobiev
 *
 *  This program is free software; you can distribute it and/or modify it
 *  under the terms of the GNU General Public License (Version 2) as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 */
#include <linux/cpu.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/pci.h>
#include <linux/screen_info.h>
#include <linux/time.h>

#include <asm/bootinfo.h>
#include <asm/mips-boards/generic.h>
#include <asm/mips-boards/prom.h>
#include <asm/mips-boards/malta.h>
#include <asm/mips-boards/maltaint.h>
#include <asm/dma.h>
#include <asm/traps.h>
#include <asm/gcmpregs.h>
#ifdef CONFIG_VT
#include <linux/console.h>
#endif

extern void malta_be_init(void);
extern int malta_be_handler(struct pt_regs *regs, int is_fixup);

static struct resource standard_io_resources[] = {
	{
		.name = "dma1",
		.start = 0x00,
		.end = 0x1f,
		.flags = IORESOURCE_BUSY
	},
	{
		.name = "timer",
		.start = 0x40,
		.end = 0x5f,
		.flags = IORESOURCE_BUSY
	},
	{
		.name = "keyboard",
		.start = 0x60,
		.end = 0x6f,
		.flags = IORESOURCE_BUSY
	},
	{
		.name = "dma page reg",
		.start = 0x80,
		.end = 0x8f,
		.flags = IORESOURCE_BUSY
	},
	{
		.name = "dma2",
		.start = 0xc0,
		.end = 0xdf,
		.flags = IORESOURCE_BUSY
	},
};

const char *get_system_type(void)
{
	return "MIPS Malta";
}

#if defined(CONFIG_MIPS_MT_SMTC)
const char display_string[] = "       SMTC LINUX ON MALTA       ";
#else
const char display_string[] = "        LINUX ON MALTA       ";
#endif /* CONFIG_MIPS_MT_SMTC */

#ifdef CONFIG_BLK_DEV_FD
static void __init fd_activate(void)
{
	/*
	 * Activate Floppy Controller in the SMSC FDC37M817 Super I/O
	 * Controller.
	 * Done by YAMON 2.00 onwards
	 */
	/* Entering config state. */
	SMSC_WRITE(SMSC_CONFIG_ENTER, SMSC_CONFIG_REG);

	/* Activate floppy controller. */
	SMSC_WRITE(SMSC_CONFIG_DEVNUM, SMSC_CONFIG_REG);
	SMSC_WRITE(SMSC_CONFIG_DEVNUM_FLOPPY, SMSC_DATA_REG);
	SMSC_WRITE(SMSC_CONFIG_ACTIVATE, SMSC_CONFIG_REG);
	SMSC_WRITE(SMSC_CONFIG_ACTIVATE_ENABLE, SMSC_DATA_REG);

	/* Exit config state. */
	SMSC_WRITE(SMSC_CONFIG_EXIT, SMSC_CONFIG_REG);
}
#endif

int coherentio = -1;	/* no DMA cache coherency (may be set by user) */
int hw_coherentio;	/* init to 0 => no HW DMA cache coherency (reflects real HW) */
static int __init setcoherentio(char *str)
{
	if (coherentio < 0)
		pr_info("Command line checking done before"
				" plat_setup_iocoherency!!\n");
	if (coherentio == 0)
		pr_info("Command line enabling coherentio"
				" (this will break...)!!\n");

	coherentio = 1;
	pr_info("Hardware DMA cache coherency (command line)\n");
	return 1;
}
__setup("coherentio", setcoherentio);

static int __init setnocoherentio(char *str)
{
	if (coherentio < 0)
		pr_info("Command line checking done before"
				" plat_setup_iocoherency!!\n");
	if (coherentio == 1)
		pr_info("Command line disabling coherentio\n");

	coherentio = 0;
	pr_info("Software DMA cache coherency (command line)\n");
	return 1;
}
__setup("nocoherentio", setnocoherentio);

static int __init
plat_enable_iocoherency(void)
{
	int supported = 0;
	if (mips_revision_sconid == MIPS_REVISION_SCON_BONITO) {
		if (BONITO_PCICACHECTRL & BONITO_PCICACHECTRL_CPUCOH_PRES) {
			BONITO_PCICACHECTRL |= BONITO_PCICACHECTRL_CPUCOH_EN;
			pr_info("Enabled Bonito CPU coherency\n");
			supported = 1;
		}
		if (strstr(prom_getcmdline(), "iobcuncached")) {
			BONITO_PCICACHECTRL &= ~BONITO_PCICACHECTRL_IOBCCOH_EN;
			BONITO_PCIMEMBASECFG = BONITO_PCIMEMBASECFG &
				~(BONITO_PCIMEMBASECFG_MEMBASE0_CACHED |
				  BONITO_PCIMEMBASECFG_MEMBASE1_CACHED);
			pr_info("Disabled Bonito IOBC coherency\n");
		} else {
			BONITO_PCICACHECTRL |= BONITO_PCICACHECTRL_IOBCCOH_EN;
			BONITO_PCIMEMBASECFG |=
				(BONITO_PCIMEMBASECFG_MEMBASE0_CACHED |
				 BONITO_PCIMEMBASECFG_MEMBASE1_CACHED);
			pr_info("Enabled Bonito IOBC coherency\n");
		}
	} else if (gcmp_niocu() != 0) {
		/* Nothing special needs to be done to enable coherency */
		pr_info("CMP IOCU detected\n");
		if ((*(unsigned int *)0xbf403000 & 0x81) != 0x81) {
			pr_crit("IOCU OPERATION DISABLED BY SWITCH"
				" - DEFAULTING TO SW IO COHERENCY\n");
			return 0;
		}
		supported = 1;
	}
	hw_coherentio = supported;
	return supported;
}

static void __init
plat_setup_iocoherency(void)
{
#ifdef CONFIG_DMA_NONCOHERENT
	/*
	 * Kernel has been configured with software coherency
	 * but we might choose to turn it off
	 */
	if (plat_enable_iocoherency()) {
		if (coherentio == 0)
			pr_info("Hardware DMA cache coherency supported"
					" but disabled from command line\n");
		else {
			coherentio = 1;
			printk(KERN_INFO "Hardware DMA cache coherency\n");
		}
	} else {
		if (coherentio == 1)
			pr_info("Hardware DMA cache coherency not supported"
				" but enabled from command line\n");
		else {
			coherentio = 0;
			pr_info("Software DMA cache coherency\n");
		}
	}
#else
	if (!plat_enable_iocoherency())
		panic("Hardware DMA cache coherency not supported");
#endif
}

#ifdef CONFIG_BLK_DEV_IDE
static void __init pci_clock_check(void)
{
	unsigned int __iomem *jmpr_p =
		(unsigned int *) ioremap(MALTA_JMPRS_REG, sizeof(unsigned int));
	int jmpr = (__raw_readl(jmpr_p) >> 2) & 0x07;
	static const int pciclocks[] __initdata = {
		33, 20, 25, 30, 12, 16, 37, 10
	};
	int pciclock = pciclocks[jmpr];
	char *argptr = prom_getcmdline();

	if (pciclock != 33 && !strstr(argptr, "idebus=")) {
		printk(KERN_WARNING "WARNING: PCI clock is %dMHz, "
				"setting idebus\n", pciclock);
		argptr += strlen(argptr);
		sprintf(argptr, " idebus=%d", pciclock);
		if (pciclock < 20 || pciclock > 66)
			printk(KERN_WARNING "WARNING: IDE timing "
					"calculations will be incorrect\n");
	}
}
#endif

#if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
static void __init screen_info_setup(void)
{
	screen_info = (struct screen_info) {
		.orig_x = 0,
		.orig_y = 25,
		.ext_mem_k = 0,
		.orig_video_page = 0,
		.orig_video_mode = 0,
		.orig_video_cols = 80,
		.unused2 = 0,
		.orig_video_ega_bx = 0,
		.unused3 = 0,
		.orig_video_lines = 25,
		.orig_video_isVGA = VIDEO_TYPE_VGAC,
		.orig_video_points = 16
	};
}
#endif

static void __init bonito_quirks_setup(void)
{
	char *argptr;

	argptr = prom_getcmdline();
	if (strstr(argptr, "debug")) {
		BONITO_BONGENCFG |= BONITO_BONGENCFG_DEBUGMODE;
		printk(KERN_INFO "Enabled Bonito debug mode\n");
	} else
		BONITO_BONGENCFG &= ~BONITO_BONGENCFG_DEBUGMODE;

#ifdef CONFIG_DMA_COHERENT
	if (BONITO_PCICACHECTRL & BONITO_PCICACHECTRL_CPUCOH_PRES) {
		BONITO_PCICACHECTRL |= BONITO_PCICACHECTRL_CPUCOH_EN;
		printk(KERN_INFO "Enabled Bonito CPU coherency\n");

		argptr = prom_getcmdline();
		if (strstr(argptr, "iobcuncached")) {
			BONITO_PCICACHECTRL &= ~BONITO_PCICACHECTRL_IOBCCOH_EN;
			BONITO_PCIMEMBASECFG = BONITO_PCIMEMBASECFG &
				~(BONITO_PCIMEMBASECFG_MEMBASE0_CACHED |
					BONITO_PCIMEMBASECFG_MEMBASE1_CACHED);
			printk(KERN_INFO "Disabled Bonito IOBC coherency\n");
		} else {
			BONITO_PCICACHECTRL |= BONITO_PCICACHECTRL_IOBCCOH_EN;
			BONITO_PCIMEMBASECFG |=
				(BONITO_PCIMEMBASECFG_MEMBASE0_CACHED |
					BONITO_PCIMEMBASECFG_MEMBASE1_CACHED);
			printk(KERN_INFO "Enabled Bonito IOBC coherency\n");
		}
	} else
		panic("Hardware DMA cache coherency not supported");
#endif
}

void __init plat_mem_setup(void)
{
	unsigned int i;

	mips_pcibios_init();

	/* Request I/O space for devices used on the Malta board. */
	for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
		request_resource(&ioport_resource, standard_io_resources+i);

	/*
	 * Enable DMA channel 4 (cascade channel) in the PIIX4 south bridge.
	 */
	enable_dma(4);

#ifdef CONFIG_DMA_COHERENT
	if (mips_revision_sconid != MIPS_REVISION_SCON_BONITO)
		panic("Hardware DMA cache coherency not supported");
#endif

	if (mips_revision_sconid == MIPS_REVISION_SCON_BONITO)
		bonito_quirks_setup();

	plat_setup_iocoherency();

#ifdef CONFIG_BLK_DEV_IDE
	pci_clock_check();
#endif

#ifdef CONFIG_BLK_DEV_FD
	fd_activate();
#endif

#if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
	screen_info_setup();
#endif

	board_be_init = malta_be_init;
	board_be_handler = malta_be_handler;
}
/* Enable PCI 2.1 compatibility in PIIX4 */
static void __init quirk_dlcsetup(struct pci_dev *dev)
{
	u8 odlc, ndlc;
	(void) pci_read_config_byte(dev, 0x82, &odlc);
	/* Enable passive releases and delayed transaction */
	ndlc = odlc | 7;
	(void) pci_write_config_byte(dev, 0x82, ndlc);
}
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_0,
		quirk_dlcsetup);