Initial import

1 files changed, 418 insertions, 0 deletions

diff --git a/drivers/pcmcia/at91_cf.c b/drivers/pcmcia/at91_cf.c
new file mode 100644
index 000000000..e7775a41a
--- /dev/null
+++ b/drivers/pcmcia/at91_cf.c
@@ -0,0 +1,418 @@
+/*
+ * at91_cf.c -- AT91 CompactFlash controller driver
+ *
+ * Copyright (C) 2005 David Brownell
+ *
+ * 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.
+ */
+
+#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/platform_data/atmel.h>
+#include <linux/io.h>
+#include <linux/sizes.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+
+#include <pcmcia/ss.h>
+
+#include <mach/at91rm9200_mc.h>
+#include <mach/at91_ramc.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_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.
+	 */
+	csr = at91_ramc_read(0, AT91_SMC_CSR(cf->board->chipselect)) & ~AT91_SMC_DBW;
+
+	/*
+	 * 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_SMC_DBW_8;
+		dev_dbg(&cf->pdev->dev, "8bit i/o bus\n");
+	} else {
+		csr |= AT91_SMC_DBW_16;
+		dev_dbg(&cf->pdev->dev, "16bit i/o bus\n");
+	}
+	at91_ramc_write(0, AT91_SMC_CSR(cf->board->chipselect), 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,
+};
+
+/*--------------------------------------------------------------------------*/
+
+#if defined(CONFIG_OF)
+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_dt_init(struct platform_device *pdev)
+{
+	struct at91_cf_data *board;
+
+	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);
+
+	pdev->dev.platform_data = board;
+
+	return 0;
+}
+#else
+static int at91_cf_dt_init(struct platform_device *pdev)
+{
+	return -ENODEV;
+}
+#endif
+
+static int at91_cf_probe(struct platform_device *pdev)
+{
+	struct at91_cf_socket	*cf;
+	struct at91_cf_data	*board = pdev->dev.platform_data;
+	struct resource		*io;
+	int			status;
+
+	if (!board) {
+		status = at91_cf_dt_init(pdev);
+		if (status)
+			return status;
+
+		board = pdev->dev.platform_data;
+	}
+
+	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;
+	status = pci_ioremap_io(0x10000, 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 = of_match_ptr(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");