pcmcia: add support CompactFlash PCMCIA support for Blackfin.

A new host driver to add CompactFlash PCMCIA support for Blackfin.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Cc: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

1 files changed, 339 insertions, 0 deletions

diff --git a/drivers/pcmcia/bfin_cf_pcmcia.c b/drivers/pcmcia/bfin_cf_pcmcia.c
new file mode 100644
index 00000000000..bb7338863fb
--- /dev/null
+++ b/drivers/pcmcia/bfin_cf_pcmcia.c
@@ -0,0 +1,339 @@
+/*
+ * 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/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->irq.AssignedIRQ = 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)
+		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 int bfin_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
+{
+	return pcmcia_socket_dev_suspend(&pdev->dev, mesg);
+}
+
+static int bfin_cf_resume(struct platform_device *pdev)
+{
+	return pcmcia_socket_dev_resume(&pdev->dev);
+}
+
+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),
+	.suspend = bfin_cf_suspend,
+	.resume = bfin_cf_resume,
+};
+
+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");