/*
 * file: drivers/pcmcia/bfin_cf.c
 *
 * based on: drivers/pcmcia/omap_cf.c
 * omap_cf.c -- OMAP 16xx CompactFlash controller driver
 *
 * Copyright (c) 2005 David Brownell
 * Copyright (c) 2006-2008 Michael Hennerich Analog Devices Inc.
 *
 * bugs:         enter bugs at http://blackfin.uclinux.org/
 *
 * 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, 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; see the file copying.
 * if not, write to the free software foundation,
 * 59 temple place - suite 330, boston, ma 02111-1307, usa.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/platform_device.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>

#include <pcmcia/ss.h>
#include <pcmcia/cisreg.h>
#include <asm/gpio.h>

#define	SZ_1K	0x00000400
#define	SZ_8K	0x00002000
#define	SZ_2K	(2 * SZ_1K)

#define	POLL_INTERVAL	(2 * HZ)

#define	CF_ATASEL_ENA 	0x20311802	/* Inverts RESET */
#define	CF_ATASEL_DIS 	0x20311800

#define bfin_cf_present(pfx) (gpio_get_value(pfx))

/*--------------------------------------------------------------------------*/

static const char driver_name[] = "bfin_cf_pcmcia";

struct bfin_cf_socket {
	struct pcmcia_socket socket;

	struct timer_list timer;
	unsigned present:1;
	unsigned active:1;

	struct platform_device *pdev;
	unsigned long phys_cf_io;
	unsigned long phys_cf_attr;
	u_int irq;
	u_short cd_pfx;
};

/*--------------------------------------------------------------------------*/
static int bfin_cf_reset(void)
{
	outw(0, CF_ATASEL_ENA);
	mdelay(200);
	outw(0, CF_ATASEL_DIS);

	return 0;
}

static int bfin_cf_ss_init(struct pcmcia_socket *s)
{
	return 0;
}

/* the timer is primarily to kick this socket's pccardd */
static void bfin_cf_timer(unsigned long _cf)
{
	struct bfin_cf_socket *cf = (void *)_cf;
	unsigned short present = bfin_cf_present(cf->cd_pfx);

	if (present != cf->present) {
		cf->present = present;
		dev_dbg(&cf->pdev->dev, ": card %s\n",
			 present ? "present" : "gone");
		pcmcia_parse_events(&cf->socket, SS_DETECT);
	}

	if (cf->active)
		mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
}

static int bfin_cf_get_status(struct pcmcia_socket *s, u_int *sp)
{
	struct bfin_cf_socket *cf;

	if (!sp)
		return -EINVAL;

	cf = container_of(s, struct bfin_cf_socket, socket);

	if (bfin_cf_present(cf->cd_pfx)) {
		*sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
		s->pcmcia_irq = 0;
		s->pci_irq = cf->irq;

	} else
		*sp = 0;
	return 0;
}

static int
bfin_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
{

	struct bfin_cf_socket *cf;
	cf = container_of(sock, struct bfin_cf_socket, socket);

	switch (s->Vcc) {
	case 0:
	case 33:
		break;
	case 50:
		break;
	default:
		return -EINVAL;
	}

	if (s->flags & SS_RESET) {
		disable_irq(cf->irq);
		bfin_cf_reset();
		enable_irq(cf->irq);
	}

	dev_dbg(&cf->pdev->dev, ": Vcc %d, io_irq %d, flags %04x csc %04x\n",
		 s->Vcc, s->io_irq, s->flags, s->csc_mask);

	return 0;
}

static int bfin_cf_ss_suspend(struct pcmcia_socket *s)
{
	return bfin_cf_set_socket(s, &dead_socket);
}

/* regions are 2K each:  mem, attrib, io (and reserved-for-ide) */

static int bfin_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
{
	struct bfin_cf_socket *cf;

	cf = container_of(s, struct bfin_cf_socket, socket);
	io->flags &= MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT;
	io->start = cf->phys_cf_io;
	io->stop = io->start + SZ_2K - 1;
	return 0;
}

static int
bfin_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
{
	struct bfin_cf_socket *cf;

	if (map->card_start)
		return -EINVAL;
	cf = container_of(s, struct bfin_cf_socket, socket);
	map->static_start = cf->phys_cf_io;
	map->flags &= MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT;
	if (map->flags & MAP_ATTRIB)
		map->static_start = cf->phys_cf_attr;

	return 0;
}

static struct pccard_operations bfin_cf_ops = {
	.init = bfin_cf_ss_init,
	.suspend = bfin_cf_ss_suspend,
	.get_status = bfin_cf_get_status,
	.set_socket = bfin_cf_set_socket,
	.set_io_map = bfin_cf_set_io_map,
	.set_mem_map = bfin_cf_set_mem_map,
};

/*--------------------------------------------------------------------------*/

static int __devinit bfin_cf_probe(struct platform_device *pdev)
{
	struct bfin_cf_socket *cf;
	struct resource *io_mem, *attr_mem;
	int irq;
	unsigned short cd_pfx;
	int status = 0;

	dev_info(&pdev->dev, "Blackfin CompactFlash/PCMCIA Socket Driver\n");

	irq = platform_get_irq(pdev, 0);
	if (irq <= 0)
		return -EINVAL;

	cd_pfx = platform_get_irq(pdev, 1);	/*Card Detect GPIO PIN */

	if (gpio_request(cd_pfx, "pcmcia: CD")) {
		dev_err(&pdev->dev,
		       "Failed ro request Card Detect GPIO_%d\n",
		       cd_pfx);
		return -EBUSY;
	}
	gpio_direction_input(cd_pfx);

	cf = kzalloc(sizeof *cf, GFP_KERNEL);
	if (!cf) {
		gpio_free(cd_pfx);
		return -ENOMEM;
	}

	cf->cd_pfx = cd_pfx;

	setup_timer(&cf->timer, bfin_cf_timer, (unsigned long)cf);

	cf->pdev = pdev;
	platform_set_drvdata(pdev, cf);

	cf->irq = irq;
	cf->socket.pci_irq = irq;

	set_irq_type(irq, IRQF_TRIGGER_LOW);

	io_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	attr_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);

	if (!io_mem || !attr_mem)
		goto fail0;

	cf->phys_cf_io = io_mem->start;
	cf->phys_cf_attr = attr_mem->start;

	/* pcmcia layer only remaps "real" memory */
	cf->socket.io_offset = (unsigned long)
	    ioremap(cf->phys_cf_io, SZ_2K);

	if (!cf->socket.io_offset)
		goto fail0;

	dev_err(&pdev->dev, ": on irq %d\n", irq);

	dev_dbg(&pdev->dev, ": %s\n",
		 bfin_cf_present(cf->cd_pfx) ? "present" : "(not present)");

	cf->socket.owner = THIS_MODULE;
	cf->socket.dev.parent = &pdev->dev;
	cf->socket.ops = &bfin_cf_ops;
	cf->socket.resource_ops = &pccard_static_ops;
	cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
	    | SS_CAP_MEM_ALIGN;
	cf->socket.map_size = SZ_2K;

	status = pcmcia_register_socket(&cf->socket);
	if (status < 0)
		goto fail2;

	cf->active = 1;
	mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
	return 0;

fail2:
	iounmap((void __iomem *)cf->socket.io_offset);
	release_mem_region(cf->phys_cf_io, SZ_8K);

fail0:
	gpio_free(cf->cd_pfx);
	kfree(cf);
	platform_set_drvdata(pdev, NULL);

	return status;
}

static int __devexit bfin_cf_remove(struct platform_device *pdev)
{
	struct bfin_cf_socket *cf = platform_get_drvdata(pdev);

	gpio_free(cf->cd_pfx);
	cf->active = 0;
	pcmcia_unregister_socket(&cf->socket);
	del_timer_sync(&cf->timer);
	iounmap((void __iomem *)cf->socket.io_offset);
	release_mem_region(cf->phys_cf_io, SZ_8K);
	platform_set_drvdata(pdev, NULL);
	kfree(cf);
	return 0;
}

static struct platform_driver bfin_cf_driver = {
	.driver = {
		   .name = (char *)driver_name,
		   .owner = THIS_MODULE,
		   },
	.probe = bfin_cf_probe,
	.remove = __devexit_p(bfin_cf_remove),
};

static int __init bfin_cf_init(void)
{
	return platform_driver_register(&bfin_cf_driver);
}

static void __exit bfin_cf_exit(void)
{
	platform_driver_unregister(&bfin_cf_driver);
}

module_init(bfin_cf_init);
module_exit(bfin_cf_exit);

MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("BFIN CF/PCMCIA Driver");
MODULE_LICENSE("GPL");