drivers/pcmcia/bfin_cf_pcmcia.c - linux - Git at Google

 /*
  * 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 <linux/gpio.h>

 #include <pcmcia/ss.h>
 #include <pcmcia/cisreg.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(struct timer_list *t)
 {
 	struct bfin_cf_socket *cf = from_timer(cf, t, timer);
 	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 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;

 	timer_setup(&cf->timer, bfin_cf_timer, 0);

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

 	cf->irq = irq;
 	cf->socket.pci_irq = 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 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 = driver_name,
 		   },
 	.probe = bfin_cf_probe,
 	.remove = bfin_cf_remove,
 };

 module_platform_driver(bfin_cf_driver);

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

	#include <pcmcia/ss.h>
	#include <pcmcia/cisreg.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(struct timer_list *t)
	{
	struct bfin_cf_socket *cf = from_timer(cf, t, timer);
	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 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;

	timer_setup(&cf->timer, bfin_cf_timer, 0);

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

	cf->irq = irq;
	cf->socket.pci_irq = 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 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 = driver_name,
	},
	.probe = bfin_cf_probe,
	.remove = bfin_cf_remove,
	};

	module_platform_driver(bfin_cf_driver);

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