drivers/pcmcia/at91_cf.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * at91_cf.c -- AT91 CompactFlash controller driver
  *
  * Copyright (C) 2005 David Brownell
  */

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/platform_device.h>
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/slab.h>
 #include <linux/gpio.h>
 #include <linux/io.h>
 #include <linux/sizes.h>
 #include <linux/mfd/syscon.h>
 #include <linux/mfd/syscon/atmel-mc.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/of_gpio.h>
 #include <linux/pci.h>
 #include <linux/regmap.h>

 #include <pcmcia/ss.h>

 /*
  * A0..A10 work in each range; A23 indicates I/O space;  A25 is CFRNW;
  * some other bit in {A24,A22..A11} is nREG to flag memory access
  * (vs attributes).  So more than 2KB/region would just be waste.
  * Note: These are offsets from the physical base address.
  */
 #define	CF_ATTR_PHYS	(0)
 #define	CF_IO_PHYS	(1 << 23)
 #define	CF_MEM_PHYS	(0x017ff800)

 struct at91_cf_data {
 	int	irq_pin;		/* I/O IRQ */
 	int	det_pin;		/* Card detect */
 	int	vcc_pin;		/* power switching */
 	int	rst_pin;		/* card reset */
 	u8	chipselect;		/* EBI Chip Select number */
 	u8	flags;
 #define AT91_CF_TRUE_IDE	0x01
 #define AT91_IDE_SWAP_A0_A2	0x02
 };

 struct regmap *mc;

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

 struct at91_cf_socket {
 	struct pcmcia_socket	socket;

 	unsigned		present:1;

 	struct platform_device	*pdev;
 	struct at91_cf_data	*board;

 	unsigned long		phys_baseaddr;
 };

 static inline int at91_cf_present(struct at91_cf_socket *cf)
 {
 	return !gpio_get_value(cf->board->det_pin);
 }

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

 static int at91_cf_ss_init(struct pcmcia_socket *s)
 {
 	return 0;
 }

 static irqreturn_t at91_cf_irq(int irq, void *_cf)
 {
 	struct at91_cf_socket *cf = _cf;

 	if (irq == gpio_to_irq(cf->board->det_pin)) {
 		unsigned present = at91_cf_present(cf);

 		/* kick pccard as needed */
 		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);
 		}
 	}

 	return IRQ_HANDLED;
 }

 static int at91_cf_get_status(struct pcmcia_socket *s, u_int *sp)
 {
 	struct at91_cf_socket	*cf;

 	if (!sp)
 		return -EINVAL;

 	cf = container_of(s, struct at91_cf_socket, socket);

 	/* NOTE: CF is always 3VCARD */
 	if (at91_cf_present(cf)) {
 		int rdy	= gpio_is_valid(cf->board->irq_pin);	/* RDY/nIRQ */
 		int vcc	= gpio_is_valid(cf->board->vcc_pin);

 		*sp = SS_DETECT | SS_3VCARD;
 		if (!rdy || gpio_get_value(cf->board->irq_pin))
 			*sp |= SS_READY;
 		if (!vcc || gpio_get_value(cf->board->vcc_pin))
 			*sp |= SS_POWERON;
 	} else
 		*sp = 0;

 	return 0;
 }

 static int
 at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
 {
 	struct at91_cf_socket	*cf;

 	cf = container_of(sock, struct at91_cf_socket, socket);

 	/* switch Vcc if needed and possible */
 	if (gpio_is_valid(cf->board->vcc_pin)) {
 		switch (s->Vcc) {
 		case 0:
 			gpio_set_value(cf->board->vcc_pin, 0);
 			break;
 		case 33:
 			gpio_set_value(cf->board->vcc_pin, 1);
 			break;
 		default:
 			return -EINVAL;
 		}
 	}

 	/* toggle reset if needed */
 	gpio_set_value(cf->board->rst_pin, s->flags & SS_RESET);

 	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 at91_cf_ss_suspend(struct pcmcia_socket *s)
 {
 	return at91_cf_set_socket(s, &dead_socket);
 }

 /* we already mapped the I/O region */
 static int at91_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
 {
 	struct at91_cf_socket	*cf;
 	u32			csr;

 	cf = container_of(s, struct at91_cf_socket, socket);
 	io->flags &= (MAP_ACTIVE | MAP_16BIT | MAP_AUTOSZ);

 	/*
 	 * Use 16 bit accesses unless/until we need 8-bit i/o space.
 	 *
 	 * NOTE: this CF controller ignores IOIS16, so we can't really do
 	 * MAP_AUTOSZ.  The 16bit mode allows single byte access on either
 	 * D0-D7 (even addr) or D8-D15 (odd), so it's close enough for many
 	 * purposes (and handles ide-cs).
 	 *
 	 * The 8bit mode is needed for odd byte access on D0-D7.  It seems
 	 * some cards only like that way to get at the odd byte, despite
 	 * CF 3.0 spec table 35 also giving the D8-D15 option.
 	 */
 	if (!(io->flags & (MAP_16BIT | MAP_AUTOSZ))) {
 		csr = AT91_MC_SMC_DBW_8;
 		dev_dbg(&cf->pdev->dev, "8bit i/o bus\n");
 	} else {
 		csr = AT91_MC_SMC_DBW_16;
 		dev_dbg(&cf->pdev->dev, "16bit i/o bus\n");
 	}
 	regmap_update_bits(mc, AT91_MC_SMC_CSR(cf->board->chipselect),
 			   AT91_MC_SMC_DBW, csr);

 	io->start = cf->socket.io_offset;
 	io->stop = io->start + SZ_2K - 1;

 	return 0;
 }

 /* pcmcia layer maps/unmaps mem regions */
 static int
 at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
 {
 	struct at91_cf_socket	*cf;

 	if (map->card_start)
 		return -EINVAL;

 	cf = container_of(s, struct at91_cf_socket, socket);

 	map->flags &= (MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT);
 	if (map->flags & MAP_ATTRIB)
 		map->static_start = cf->phys_baseaddr + CF_ATTR_PHYS;
 	else
 		map->static_start = cf->phys_baseaddr + CF_MEM_PHYS;

 	return 0;
 }

 static struct pccard_operations at91_cf_ops = {
 	.init			= at91_cf_ss_init,
 	.suspend		= at91_cf_ss_suspend,
 	.get_status		= at91_cf_get_status,
 	.set_socket		= at91_cf_set_socket,
 	.set_io_map		= at91_cf_set_io_map,
 	.set_mem_map		= at91_cf_set_mem_map,
 };

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

 static const struct of_device_id at91_cf_dt_ids[] = {
 	{ .compatible = "atmel,at91rm9200-cf" },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, at91_cf_dt_ids);

 static int at91_cf_probe(struct platform_device *pdev)
 {
 	struct at91_cf_socket	*cf;
 	struct at91_cf_data	*board;
 	struct resource		*io;
 	struct resource		realio;
 	int			status;

 	board = devm_kzalloc(&pdev->dev, sizeof(*board), GFP_KERNEL);
 	if (!board)
 		return -ENOMEM;

 	board->irq_pin = of_get_gpio(pdev->dev.of_node, 0);
 	board->det_pin = of_get_gpio(pdev->dev.of_node, 1);
 	board->vcc_pin = of_get_gpio(pdev->dev.of_node, 2);
 	board->rst_pin = of_get_gpio(pdev->dev.of_node, 3);

 	mc = syscon_regmap_lookup_by_compatible("atmel,at91rm9200-sdramc");
 	if (IS_ERR(mc))
 		return PTR_ERR(mc);

 	if (!gpio_is_valid(board->det_pin) || !gpio_is_valid(board->rst_pin))
 		return -ENODEV;

 	io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!io)
 		return -ENODEV;

 	cf = devm_kzalloc(&pdev->dev, sizeof(*cf), GFP_KERNEL);
 	if (!cf)
 		return -ENOMEM;

 	cf->board = board;
 	cf->pdev = pdev;
 	cf->phys_baseaddr = io->start;
 	platform_set_drvdata(pdev, cf);

 	/* must be a GPIO; ergo must trigger on both edges */
 	status = devm_gpio_request(&pdev->dev, board->det_pin, "cf_det");
 	if (status < 0)
 		return status;

 	status = devm_request_irq(&pdev->dev, gpio_to_irq(board->det_pin),
 					at91_cf_irq, 0, "at91_cf detect", cf);
 	if (status < 0)
 		return status;

 	device_init_wakeup(&pdev->dev, 1);

 	status = devm_gpio_request(&pdev->dev, board->rst_pin, "cf_rst");
 	if (status < 0)
 		goto fail0a;

 	if (gpio_is_valid(board->vcc_pin)) {
 		status = devm_gpio_request(&pdev->dev, board->vcc_pin, "cf_vcc");
 		if (status < 0)
 			goto fail0a;
 	}

 	/*
 	 * The card driver will request this irq later as needed.
 	 * but it causes lots of "irqNN: nobody cared" messages
 	 * unless we report that we handle everything (sigh).
 	 * (Note:  DK board doesn't wire the IRQ pin...)
 	 */
 	if (gpio_is_valid(board->irq_pin)) {
 		status = devm_gpio_request(&pdev->dev, board->irq_pin, "cf_irq");
 		if (status < 0)
 			goto fail0a;

 		status = devm_request_irq(&pdev->dev, gpio_to_irq(board->irq_pin),
 					at91_cf_irq, IRQF_SHARED, "at91_cf", cf);
 		if (status < 0)
 			goto fail0a;
 		cf->socket.pci_irq = gpio_to_irq(board->irq_pin);
 	} else
 		cf->socket.pci_irq = nr_irqs + 1;

 	/*
 	 * pcmcia layer only remaps "real" memory not iospace
 	 * io_offset is set to 0x10000 to avoid the check in static_find_io().
 	 * */
 	cf->socket.io_offset = 0x10000;
 	realio.start = cf->socket.io_offset;
 	realio.end = realio.start + SZ_64K - 1;
 	status = pci_remap_iospace(&realio, cf->phys_baseaddr + CF_IO_PHYS);
 	if (status)
 		goto fail0a;

 	/* reserve chip-select regions */
 	if (!devm_request_mem_region(&pdev->dev, io->start, resource_size(io), "at91_cf")) {
 		status = -ENXIO;
 		goto fail0a;
 	}

 	dev_info(&pdev->dev, "irqs det #%d, io #%d\n",
 		gpio_to_irq(board->det_pin), gpio_to_irq(board->irq_pin));

 	cf->socket.owner = THIS_MODULE;
 	cf->socket.dev.parent = &pdev->dev;
 	cf->socket.ops = &at91_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;
 	cf->socket.io[0].res = io;

 	status = pcmcia_register_socket(&cf->socket);
 	if (status < 0)
 		goto fail0a;

 	return 0;

 fail0a:
 	device_init_wakeup(&pdev->dev, 0);
 	return status;
 }

 static int at91_cf_remove(struct platform_device *pdev)
 {
 	struct at91_cf_socket	*cf = platform_get_drvdata(pdev);

 	pcmcia_unregister_socket(&cf->socket);
 	device_init_wakeup(&pdev->dev, 0);

 	return 0;
 }

 #ifdef	CONFIG_PM

 static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
 {
 	struct at91_cf_socket	*cf = platform_get_drvdata(pdev);
 	struct at91_cf_data	*board = cf->board;

 	if (device_may_wakeup(&pdev->dev)) {
 		enable_irq_wake(gpio_to_irq(board->det_pin));
 		if (gpio_is_valid(board->irq_pin))
 			enable_irq_wake(gpio_to_irq(board->irq_pin));
 	}
 	return 0;
 }

 static int at91_cf_resume(struct platform_device *pdev)
 {
 	struct at91_cf_socket	*cf = platform_get_drvdata(pdev);
 	struct at91_cf_data	*board = cf->board;

 	if (device_may_wakeup(&pdev->dev)) {
 		disable_irq_wake(gpio_to_irq(board->det_pin));
 		if (gpio_is_valid(board->irq_pin))
 			disable_irq_wake(gpio_to_irq(board->irq_pin));
 	}

 	return 0;
 }

 #else
 #define	at91_cf_suspend		NULL
 #define	at91_cf_resume		NULL
 #endif

 static struct platform_driver at91_cf_driver = {
 	.driver = {
 		.name		= "at91_cf",
 		.of_match_table = at91_cf_dt_ids,
 	},
 	.probe		= at91_cf_probe,
 	.remove		= at91_cf_remove,
 	.suspend	= at91_cf_suspend,
 	.resume		= at91_cf_resume,
 };

 module_platform_driver(at91_cf_driver);

 MODULE_DESCRIPTION("AT91 Compact Flash Driver");
 MODULE_AUTHOR("David Brownell");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:at91_cf");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* at91_cf.c -- AT91 CompactFlash controller driver
	*
	* Copyright (C) 2005 David Brownell
	*/

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/platform_device.h>
	#include <linux/errno.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/slab.h>
	#include <linux/gpio.h>
	#include <linux/io.h>
	#include <linux/sizes.h>
	#include <linux/mfd/syscon.h>
	#include <linux/mfd/syscon/atmel-mc.h>
	#include <linux/of.h>
	#include <linux/of_device.h>
	#include <linux/of_gpio.h>
	#include <linux/pci.h>
	#include <linux/regmap.h>

	#include <pcmcia/ss.h>

	/*
	* A0..A10 work in each range; A23 indicates I/O space; A25 is CFRNW;
	* some other bit in {A24,A22..A11} is nREG to flag memory access
	* (vs attributes). So more than 2KB/region would just be waste.
	* Note: These are offsets from the physical base address.
	*/
	#define CF_ATTR_PHYS (0)
	#define CF_IO_PHYS (1 << 23)
	#define CF_MEM_PHYS (0x017ff800)

	struct at91_cf_data {
	int irq_pin; /* I/O IRQ */
	int det_pin; /* Card detect */
	int vcc_pin; /* power switching */
	int rst_pin; /* card reset */
	u8 chipselect; /* EBI Chip Select number */
	u8 flags;
	#define AT91_CF_TRUE_IDE 0x01
	#define AT91_IDE_SWAP_A0_A2 0x02
	};

	struct regmap *mc;

	/--------------------------------------------------------------------------/

	struct at91_cf_socket {
	struct pcmcia_socket socket;

	unsigned present:1;

	struct platform_device *pdev;
	struct at91_cf_data *board;

	unsigned long phys_baseaddr;
	};

	static inline int at91_cf_present(struct at91_cf_socket *cf)
	{
	return !gpio_get_value(cf->board->det_pin);
	}

	/--------------------------------------------------------------------------/

	static int at91_cf_ss_init(struct pcmcia_socket *s)
	{
	return 0;
	}

	static irqreturn_t at91_cf_irq(int irq, void *_cf)
	{
	struct at91_cf_socket *cf = _cf;

	if (irq == gpio_to_irq(cf->board->det_pin)) {
	unsigned present = at91_cf_present(cf);

	/* kick pccard as needed */
	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);
	}
	}

	return IRQ_HANDLED;
	}

	static int at91_cf_get_status(struct pcmcia_socket s, u_int sp)
	{
	struct at91_cf_socket *cf;

	if (!sp)
	return -EINVAL;

	cf = container_of(s, struct at91_cf_socket, socket);

	/* NOTE: CF is always 3VCARD */
	if (at91_cf_present(cf)) {
	int rdy = gpio_is_valid(cf->board->irq_pin); /* RDY/nIRQ */
	int vcc = gpio_is_valid(cf->board->vcc_pin);

	*sp = SS_DETECT \| SS_3VCARD;
	if (!rdy \|\| gpio_get_value(cf->board->irq_pin))
	*sp \|= SS_READY;
	if (!vcc \|\| gpio_get_value(cf->board->vcc_pin))
	*sp \|= SS_POWERON;
	} else
	*sp = 0;

	return 0;
	}

	static int
	at91_cf_set_socket(struct pcmcia_socket sock, struct socket_state_t s)
	{
	struct at91_cf_socket *cf;

	cf = container_of(sock, struct at91_cf_socket, socket);

	/* switch Vcc if needed and possible */
	if (gpio_is_valid(cf->board->vcc_pin)) {
	switch (s->Vcc) {
	case 0:
	gpio_set_value(cf->board->vcc_pin, 0);
	break;
	case 33:
	gpio_set_value(cf->board->vcc_pin, 1);
	break;
	default:
	return -EINVAL;
	}
	}

	/* toggle reset if needed */
	gpio_set_value(cf->board->rst_pin, s->flags & SS_RESET);

	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 at91_cf_ss_suspend(struct pcmcia_socket *s)
	{
	return at91_cf_set_socket(s, &dead_socket);
	}

	/* we already mapped the I/O region */
	static int at91_cf_set_io_map(struct pcmcia_socket s, struct pccard_io_map io)
	{
	struct at91_cf_socket *cf;
	u32 csr;

	cf = container_of(s, struct at91_cf_socket, socket);
	io->flags &= (MAP_ACTIVE \| MAP_16BIT \| MAP_AUTOSZ);

	/*
	* Use 16 bit accesses unless/until we need 8-bit i/o space.
	*
	* NOTE: this CF controller ignores IOIS16, so we can't really do
	* MAP_AUTOSZ. The 16bit mode allows single byte access on either
	* D0-D7 (even addr) or D8-D15 (odd), so it's close enough for many
	* purposes (and handles ide-cs).
	*
	* The 8bit mode is needed for odd byte access on D0-D7. It seems
	* some cards only like that way to get at the odd byte, despite
	* CF 3.0 spec table 35 also giving the D8-D15 option.
	*/
	if (!(io->flags & (MAP_16BIT \| MAP_AUTOSZ))) {
	csr = AT91_MC_SMC_DBW_8;
	dev_dbg(&cf->pdev->dev, "8bit i/o bus\n");
	} else {
	csr = AT91_MC_SMC_DBW_16;
	dev_dbg(&cf->pdev->dev, "16bit i/o bus\n");
	}
	regmap_update_bits(mc, AT91_MC_SMC_CSR(cf->board->chipselect),
	AT91_MC_SMC_DBW, csr);

	io->start = cf->socket.io_offset;
	io->stop = io->start + SZ_2K - 1;

	return 0;
	}

	/* pcmcia layer maps/unmaps mem regions */
	static int
	at91_cf_set_mem_map(struct pcmcia_socket s, struct pccard_mem_map map)
	{
	struct at91_cf_socket *cf;

	if (map->card_start)
	return -EINVAL;

	cf = container_of(s, struct at91_cf_socket, socket);

	map->flags &= (MAP_ACTIVE \| MAP_ATTRIB \| MAP_16BIT);
	if (map->flags & MAP_ATTRIB)
	map->static_start = cf->phys_baseaddr + CF_ATTR_PHYS;
	else
	map->static_start = cf->phys_baseaddr + CF_MEM_PHYS;

	return 0;
	}

	static struct pccard_operations at91_cf_ops = {
	.init = at91_cf_ss_init,
	.suspend = at91_cf_ss_suspend,
	.get_status = at91_cf_get_status,
	.set_socket = at91_cf_set_socket,
	.set_io_map = at91_cf_set_io_map,
	.set_mem_map = at91_cf_set_mem_map,
	};

	/--------------------------------------------------------------------------/

	static const struct of_device_id at91_cf_dt_ids[] = {
	{ .compatible = "atmel,at91rm9200-cf" },
	{ /* sentinel */ }
	};
	MODULE_DEVICE_TABLE(of, at91_cf_dt_ids);

	static int at91_cf_probe(struct platform_device *pdev)
	{
	struct at91_cf_socket *cf;
	struct at91_cf_data *board;
	struct resource *io;
	struct resource realio;
	int status;

	board = devm_kzalloc(&pdev->dev, sizeof(*board), GFP_KERNEL);
	if (!board)
	return -ENOMEM;

	board->irq_pin = of_get_gpio(pdev->dev.of_node, 0);
	board->det_pin = of_get_gpio(pdev->dev.of_node, 1);
	board->vcc_pin = of_get_gpio(pdev->dev.of_node, 2);
	board->rst_pin = of_get_gpio(pdev->dev.of_node, 3);

	mc = syscon_regmap_lookup_by_compatible("atmel,at91rm9200-sdramc");
	if (IS_ERR(mc))
	return PTR_ERR(mc);

	if (!gpio_is_valid(board->det_pin) \|\| !gpio_is_valid(board->rst_pin))
	return -ENODEV;

	io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!io)
	return -ENODEV;

	cf = devm_kzalloc(&pdev->dev, sizeof(*cf), GFP_KERNEL);
	if (!cf)
	return -ENOMEM;

	cf->board = board;
	cf->pdev = pdev;
	cf->phys_baseaddr = io->start;
	platform_set_drvdata(pdev, cf);

	/* must be a GPIO; ergo must trigger on both edges */
	status = devm_gpio_request(&pdev->dev, board->det_pin, "cf_det");
	if (status < 0)
	return status;

	status = devm_request_irq(&pdev->dev, gpio_to_irq(board->det_pin),
	at91_cf_irq, 0, "at91_cf detect", cf);
	if (status < 0)
	return status;

	device_init_wakeup(&pdev->dev, 1);

	status = devm_gpio_request(&pdev->dev, board->rst_pin, "cf_rst");
	if (status < 0)
	goto fail0a;

	if (gpio_is_valid(board->vcc_pin)) {
	status = devm_gpio_request(&pdev->dev, board->vcc_pin, "cf_vcc");
	if (status < 0)
	goto fail0a;
	}

	/*
	* The card driver will request this irq later as needed.
	* but it causes lots of "irqNN: nobody cared" messages
	* unless we report that we handle everything (sigh).
	* (Note: DK board doesn't wire the IRQ pin...)
	*/
	if (gpio_is_valid(board->irq_pin)) {
	status = devm_gpio_request(&pdev->dev, board->irq_pin, "cf_irq");
	if (status < 0)
	goto fail0a;

	status = devm_request_irq(&pdev->dev, gpio_to_irq(board->irq_pin),
	at91_cf_irq, IRQF_SHARED, "at91_cf", cf);
	if (status < 0)
	goto fail0a;
	cf->socket.pci_irq = gpio_to_irq(board->irq_pin);
	} else
	cf->socket.pci_irq = nr_irqs + 1;

	/*
	* pcmcia layer only remaps "real" memory not iospace
	* io_offset is set to 0x10000 to avoid the check in static_find_io().
	* */
	cf->socket.io_offset = 0x10000;
	realio.start = cf->socket.io_offset;
	realio.end = realio.start + SZ_64K - 1;
	status = pci_remap_iospace(&realio, cf->phys_baseaddr + CF_IO_PHYS);
	if (status)
	goto fail0a;

	/* reserve chip-select regions */
	if (!devm_request_mem_region(&pdev->dev, io->start, resource_size(io), "at91_cf")) {
	status = -ENXIO;
	goto fail0a;
	}

	dev_info(&pdev->dev, "irqs det #%d, io #%d\n",
	gpio_to_irq(board->det_pin), gpio_to_irq(board->irq_pin));

	cf->socket.owner = THIS_MODULE;
	cf->socket.dev.parent = &pdev->dev;
	cf->socket.ops = &at91_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;
	cf->socket.io[0].res = io;

	status = pcmcia_register_socket(&cf->socket);
	if (status < 0)
	goto fail0a;

	return 0;

	fail0a:
	device_init_wakeup(&pdev->dev, 0);
	return status;
	}

	static int at91_cf_remove(struct platform_device *pdev)
	{
	struct at91_cf_socket *cf = platform_get_drvdata(pdev);

	pcmcia_unregister_socket(&cf->socket);
	device_init_wakeup(&pdev->dev, 0);

	return 0;
	}

	#ifdef CONFIG_PM

	static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
	{
	struct at91_cf_socket *cf = platform_get_drvdata(pdev);
	struct at91_cf_data *board = cf->board;

	if (device_may_wakeup(&pdev->dev)) {
	enable_irq_wake(gpio_to_irq(board->det_pin));
	if (gpio_is_valid(board->irq_pin))
	enable_irq_wake(gpio_to_irq(board->irq_pin));
	}
	return 0;
	}

	static int at91_cf_resume(struct platform_device *pdev)
	{
	struct at91_cf_socket *cf = platform_get_drvdata(pdev);
	struct at91_cf_data *board = cf->board;

	if (device_may_wakeup(&pdev->dev)) {
	disable_irq_wake(gpio_to_irq(board->det_pin));
	if (gpio_is_valid(board->irq_pin))
	disable_irq_wake(gpio_to_irq(board->irq_pin));
	}

	return 0;
	}

	#else
	#define at91_cf_suspend NULL
	#define at91_cf_resume NULL
	#endif

	static struct platform_driver at91_cf_driver = {
	.driver = {
	.name = "at91_cf",
	.of_match_table = at91_cf_dt_ids,
	},
	.probe = at91_cf_probe,
	.remove = at91_cf_remove,
	.suspend = at91_cf_suspend,
	.resume = at91_cf_resume,
	};

	module_platform_driver(at91_cf_driver);

	MODULE_DESCRIPTION("AT91 Compact Flash Driver");
	MODULE_AUTHOR("David Brownell");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:at91_cf");