/*
	Mantis PCI bridge driver

	Copyright (C) 2005, 2006 Manu Abraham (abraham.manu@gmail.com)

	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.

	This program is distributed in the hope that 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <linux/kmod.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <linux/device.h>
#include "mantis_common.h"
#include "mantis_core.h"
#include "mantis_uart.h"

#include <asm/irq.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/interrupt.h>

unsigned int verbose = 1;
module_param(verbose, int, 0644);
MODULE_PARM_DESC(verbose, "verbose startup messages, default is 1 (yes)");

unsigned int devs;

#define PCI_VENDOR_ID_MANTIS			0x1822
#define PCI_DEVICE_ID_MANTIS_R11		0x4e35
#define DRIVER_NAME				"Mantis"

static struct pci_device_id mantis_pci_table[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_MANTIS, PCI_DEVICE_ID_MANTIS_R11) },
	{ 0 },
};

MODULE_DEVICE_TABLE(pci, mantis_pci_table);

static irqreturn_t mantis_pci_irq(int irq, void *dev_id)
{
	u32 stat = 0, mask = 0, lstat = 0, mstat = 0;
	u32 rst_stat = 0, rst_mask = 0;

	struct mantis_pci *mantis;
	struct mantis_ca *ca;

	mantis = (struct mantis_pci *) dev_id;
	if (unlikely(mantis == NULL)) {
		dprintk(verbose, MANTIS_ERROR, 1, "Mantis == NULL");
		return IRQ_NONE;
	}
	ca = mantis->mantis_ca;

	stat = mmread(MANTIS_INT_STAT);
	mask = mmread(MANTIS_INT_MASK);
	mstat = lstat = stat & ~MANTIS_INT_RISCSTAT;
	if (!(stat & mask))
		return IRQ_NONE;

	rst_mask  = MANTIS_GPIF_WRACK  |
		    MANTIS_GPIF_OTHERR |
		    MANTIS_SBUF_WSTO   |
		    MANTIS_GPIF_EXTIRQ;

	rst_stat  = mmread(MANTIS_GPIF_STATUS);
	rst_stat &= rst_mask;
	mmwrite(rst_stat, MANTIS_GPIF_STATUS);

	mantis->mantis_int_stat = stat;
	mantis->mantis_int_mask = mask;
	dprintk(verbose, MANTIS_DEBUG, 0, "=== Interrupts[%04x/%04x]= [", stat, mask);
	if (stat & MANTIS_INT_RISCEN) {
		dprintk(verbose, MANTIS_DEBUG, 0, "* DMA enabl *");
	}
	if (stat & MANTIS_INT_IRQ0) {
		dprintk(verbose, MANTIS_DEBUG, 0, "* INT IRQ-0 *");
		mantis->gpif_status = rst_stat;
		wake_up(&ca->hif_write_wq);
		schedule_work(&ca->hif_evm_work);
	}
	if (stat & MANTIS_INT_IRQ1) {
		dprintk(verbose, MANTIS_DEBUG, 0, "* INT IRQ-1 *");
		schedule_work(&mantis->uart_work);
	}
	if (stat & MANTIS_INT_OCERR) {
		dprintk(verbose, MANTIS_DEBUG, 0, "* INT OCERR *");
	}
	if (stat & MANTIS_INT_PABORT) {
		dprintk(verbose, MANTIS_DEBUG, 0, "* INT PABRT *");
	}
	if (stat & MANTIS_INT_RIPERR) {
		dprintk(verbose, MANTIS_DEBUG, 0, "* INT RIPRR *");
	}
	if (stat & MANTIS_INT_PPERR) {
		dprintk(verbose, MANTIS_DEBUG, 0, "* INT PPERR *");
	}
	if (stat & MANTIS_INT_FTRGT) {
		dprintk(verbose, MANTIS_DEBUG, 0, "* INT FTRGT *");
	}
	if (stat & MANTIS_INT_RISCI) {
		dprintk(verbose, MANTIS_DEBUG, 0, "* INT RISCI *");
		mantis->finished_block = (stat & MANTIS_INT_RISCSTAT) >> 28;
		tasklet_schedule(&mantis->tasklet);
	}
	if (stat & MANTIS_INT_I2CDONE) {
		dprintk(verbose, MANTIS_DEBUG, 0, "* I2C DONE  *");
		wake_up(&mantis->i2c_wq);
	}
	mmwrite(stat, MANTIS_INT_STAT);
	stat &= ~(MANTIS_INT_RISCEN   | MANTIS_INT_I2CDONE |
		  MANTIS_INT_I2CRACK  | MANTIS_INT_PCMCIA7 |
		  MANTIS_INT_PCMCIA6  | MANTIS_INT_PCMCIA5 |
		  MANTIS_INT_PCMCIA4  | MANTIS_INT_PCMCIA3 |
		  MANTIS_INT_PCMCIA2  | MANTIS_INT_PCMCIA1 |
		  MANTIS_INT_PCMCIA0  | MANTIS_INT_IRQ1	   |
		  MANTIS_INT_IRQ0     | MANTIS_INT_OCERR   |
		  MANTIS_INT_PABORT   | MANTIS_INT_RIPERR  |
		  MANTIS_INT_PPERR    | MANTIS_INT_FTRGT   |
		  MANTIS_INT_RISCI);

	if (stat)
		dprintk(verbose, MANTIS_DEBUG, 0, "* Unknown [%04x] *", stat);

	dprintk(verbose, MANTIS_DEBUG, 0, "] ===\n");

	return IRQ_HANDLED;
}


static int __devinit mantis_pci_probe(struct pci_dev *pdev,
				      const struct pci_device_id *mantis_pci_table)
{
	u8 revision, latency;
	struct mantis_pci *mantis;
	int ret = 0;

	mantis = kmalloc(sizeof (struct mantis_pci), GFP_KERNEL);
	if (mantis == NULL) {
		printk("%s: Out of memory\n", __func__);
		ret = -ENOMEM;
		goto err;
	}
	memset(mantis, 0, sizeof (struct mantis_pci));
	mantis->num = devs;
	devs++;

	if (pci_enable_device(pdev)) {
		dprintk(verbose, MANTIS_ERROR, 1, "Mantis PCI enable failed");
		ret = -ENODEV;
		goto err;
	}
	mantis->mantis_addr = pci_resource_start(pdev, 0);
	if (!request_mem_region(pci_resource_start(pdev, 0),
			pci_resource_len(pdev, 0), DRIVER_NAME)) {
		ret = -ENODEV;
		goto err0;
	}

	mantis->mantis_mmio = ioremap(pci_resource_start(pdev, 0),
				      pci_resource_len(pdev, 0));

	if (!mantis->mantis_mmio) {
		dprintk(verbose, MANTIS_ERROR, 1, "IO remap failed");
		ret = -ENODEV;
		goto err1;
	}

	// Clear and disable all interrupts at startup
	// to avoid lockup situations
	mmwrite(0x00, MANTIS_INT_MASK);
	if (request_irq(pdev->irq,
			mantis_pci_irq,
			IRQF_SHARED,
			DRIVER_NAME,
			mantis) < 0) {

		dprintk(verbose, MANTIS_ERROR, 1, "Mantis IRQ reg failed");
		ret = -ENODEV;
		goto err2;
	}
	pci_set_master(pdev);
	pci_set_drvdata(pdev, mantis);
	pci_read_config_byte(pdev, PCI_LATENCY_TIMER, &latency);
	pci_read_config_byte(pdev, PCI_CLASS_REVISION, &revision);
	mantis->latency = latency;
	mantis->revision = revision;
	mantis->pdev = pdev;
	mantis->subsystem_vendor = pdev->subsystem_vendor;
	mantis->subsystem_device = pdev->subsystem_device;
	init_waitqueue_head(&mantis->i2c_wq);

	mantis_set_direction(mantis, 0); /* CAM bypass */

	if (!latency)
		pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 32);

	dprintk(verbose, MANTIS_ERROR, 0,
		"irq: %d, latency: %d\n memory: 0x%lx, mmio: 0x%p\n",
		pdev->irq, mantis->latency,
		mantis->mantis_addr, mantis->mantis_mmio);

	// No more PCI specific stuff !
	if (mantis_core_init(mantis) < 0) {
		dprintk(verbose, MANTIS_ERROR, 1, "Mantis core init failed");
		ret = -ENODEV;
		goto err2;
	}

	return 0;

	// Error conditions ..
err2:
	dprintk(verbose, MANTIS_DEBUG, 1, "Err: IO Unmap");
	if (mantis->mantis_mmio)
		iounmap(mantis->mantis_mmio);
err1:
	dprintk(verbose, MANTIS_DEBUG, 1, "Err: Release regions");
	release_mem_region(pci_resource_start(pdev, 0),
				pci_resource_len(pdev, 0));
	pci_disable_device(pdev);
err0:
	dprintk(verbose, MANTIS_DEBUG, 1, "Err: Free");
	kfree(mantis);
err:
	dprintk(verbose, MANTIS_DEBUG, 1, "Err:");
	return ret;
}

static void __devexit mantis_pci_remove(struct pci_dev *pdev)
{
	struct mantis_pci *mantis = pci_get_drvdata(pdev);

	if (mantis == NULL) {
		dprintk(verbose, MANTIS_ERROR, 1, "Aeio, Mantis NULL ptr");
		return;
	}
	mantis_core_exit(mantis);
	dprintk(verbose, MANTIS_ERROR, 1, "Removing -->Mantis irq: %d, latency: %d\n memory: 0x%lx, mmio: 0x%p",
		pdev->irq, mantis->latency, mantis->mantis_addr,
		mantis->mantis_mmio);

	free_irq(pdev->irq, mantis);
	pci_release_regions(pdev);
	if (mantis_dma_exit(mantis) < 0)
		dprintk(verbose, MANTIS_ERROR, 1, "DMA exit failed");

	pci_set_drvdata(pdev, NULL);
	pci_disable_device(pdev);
	kfree(mantis);
}

static struct pci_driver mantis_pci_driver = {
	.name = DRIVER_NAME,
	.id_table = mantis_pci_table,
	.probe = mantis_pci_probe,
	.remove = mantis_pci_remove,
};

static int __devinit mantis_pci_init(void)
{
	return pci_register_driver(&mantis_pci_driver);
}

static void __devexit mantis_pci_exit(void)
{
	pci_unregister_driver(&mantis_pci_driver);
}

module_init(mantis_pci_init);
module_exit(mantis_pci_exit);

MODULE_DESCRIPTION("Mantis PCI DTV bridge driver");
MODULE_AUTHOR("Manu Abraham");
MODULE_LICENSE("GPL");